Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ADAPTABLE SELECTABLE ONE-WAY CLUTCH
Document Type and Number:
WIPO Patent Application WO/2018/152616
Kind Code:
A1
Abstract:
A controllable one-way clutch assembly having an electromagnetic actuator module equipped with an energizeable coil assembly, a strut moveable in response to energization of the coil assembly from a released position to a locked position, and a latching mechanism operable to releaseably hold the strut in the released position when the coil assembly is not energized.

Inventors:
GREENE, Darrell (38 Aishford Road, Bradford, Ontario L3Z 3E2, CA)
PASSOS, Alberto (743 Candlestick Cir, Mississauga, Ontario L4Z 0B2, CA)
LOUI, Dennis (Tak Man) (18 Pagehurst Court, Richmond Hill, Ontario L4C 8G6, CA)
MILACIC, Dusan (43 Stafford Road, North York, Ontario M2R 1V1, CA)
GELFAND, David (49 Marathon Ave, Concord, Ontario L4K 5G8, CA)
CIOC, Adrian (203 Weldrick Road West, Richmond Hill, Ontario L4C 5J2, CA)
UPPAL, Ranjit (76 Sleightholme Cres, Brampton, Ontario L6P 3E7, CA)
Application Number:
CA2018/000034
Publication Date:
August 30, 2018
Filing Date:
February 22, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MAGNA POWERTRAIN INC. (50 Casmir Court, Concord, Ontario L4K 4J5, CA)
International Classes:
F16D41/16; F16D27/102; F16D41/02; F16H31/00
Foreign References:
US20170356507A12017-12-14
US20070278061A12007-12-06
US20160348741A12016-12-01
US5992592A1999-11-30
US20170248177A12017-08-31
Attorney, Agent or Firm:
DICKINSON WRIGHT LLP (199 Bay Street, Suite 2200Toronto, Ontario M5L 1G4, CA)
Download PDF:
Claims:
CLAIMS

What is claimed is:

1. A one-way clutch assembly comprising:

a clutch module having a first clutch component disposed about an axis and a second clutch component disposed about the axis and arranged for rotation relative to the first clutch component about the axis, the second clutch component having ratchet teeth; and

an electromagnetic actuator module mounted to the first clutch component and having an energizeable coil assembly having a moveable actuator member, a locking member operably connected to the actuator member, and a latching mechanism;

wherein the actuator member moves from a first position to a second position in response to energization of the coil assembly for causing concurrent movement of the locking member from a released position disengaged from the ratchet teeth to a locked position engaged with the locking teeth;

wherein the actuator member is axially moveable between the first and second positions, wherein the latching mechanism is radially moveable between the latching position and the released position, and wherein axial movement of the actuator member from the first position into the second position causes radial movement of the latching mechanism from the released position into the latching position.

2. The one-way clutch assembly according to claim 1 wherein the actuator module further includes a biasing member biasing the locking member toward the released position, and wherein the latching member is operable to releasably hold the locking mechanism in its released position when the coil assembly is not energized.

3. The one-way clutch assembly according to claim 1 wherein the locking member has a pivot post segment and a strut segment extending from the pivot post segment, and wherein the locking member is pivotably connected to the first clutch element at the pivot post segment and pivotable between the locked position and released positions, wherein the strut segment engages one of the teeth of the second clutch component in the locked position, and wherein the strut segment is spaced from the teeth of the second clutch component in the unlocked position.

4. The one-way clutch assembly according to claim 3 wherein the locking member defines a plunger ramp along the strut segment in axial alignment with the actuation member such that the actuation member engages the plunger ramp during axial movement of the actuation member and provides the pivoting movement of the locking member toward the locked position.

5. The one-way clutch assembly according to claim 4 wherein the locking member has a side wall extending generally along a plane being perpendicular to the axis, and the side wall defines the plunger ramp along the strut segment, and wherein the ramp is angled relative to the side wall.

6. The one-way clutch assembly according to claim 3 wherein the pivot post segment of the locking member defines a spring pocket, wherein a biasing member is positioned in the spring pocket, and wherein the biasing member biases the locking member toward the released position.

7. The one-way clutch assembly according to claim 1 further including a wedge positioned between the first clutch component and the locking member and in alignment with the actuator member such that axial movement of the actuation member against the wedge causes pivoting movement of the locking member toward the locked position.

8. The one-way clutch assembly according to claim 7 wherein a biasing member is positioned between the wedge and the first clutch component and biases the wedge toward the actuator member.

9. The one-way clutch assembly according to claim 7 wherein the wedge includes a body extending generally perpendicularly to the axis and a tapered leg extending axially from the body between the first clutch component and the locking member, wherein the tapered leg tapers inwardly as it extends axially from the body.

10. The one-way clutch assembly according to claim 9 wherein a ratcheting spring is positioned radially between the first clutch component and the locking member for allowing ratcheting of the first clutch component as it moves toward the locked position.

1 1. A one-way clutch assembly comprising:

a clutch module having a first clutch component disposed about an axis and a second clutch component disposed about the axis and arranged for rotation relative to the first clutch component about the axis, the second clutch component having ratchet teeth; an electromagnetic actuator module mounted to the first clutch component and having an energizeable coil assembly having a moveable actuator member, a locking member operably connected to the actuator member, and a latching mechanism;

wherein the actuator member moves from a first position to a second position in response to energization of the coil assembly for causing concurrent movement of the locking member from a released position disengaged from the ratchet teeth to a locked position engaged with the locking teeth;

a wedge positioned radially between the first clutch component and the locking member and moveable in response to axial movement of the actuation member to cause the movement of the locking member between the released position and the locked position.

12. The one-way clutch assembly according to claim 1 1 wherein a linkage is positioned between the actuator member and the wedge, and wherein the linkage extends between a first end engaging the wedge and a second end engaging the plunger, and wherein the linkage is rotatable about a pivot point between the first and second end such that the linkage rotates about the pivot point in response to movement of the actuator member to cause movement of the wedge.

13. The one-way clutch assembly according to claim 12 wherein the actuation member extends to terminal end, wherein a channel extends from the terminal end of the actuation member toward the coil assembly, and wherein the second end of the linkage is received by the channel of the actuation member.

14. The one-way clutch assembly according to claim 13 wherein the actuation member defines a pair of orifices on opposite sides of the channel in alignment with one another, and wherein the linkage defines a pair of posts adjacent the second end and received by the orifices of the actuation member to provide pivoting movement of the linkage relative to the actuation member, wherein the linkage has a first arm engaging the plunger, a second arm extending at an angle relative to the first arm, wherein the pivot point is defined at an intersection between the first and second arms, and wherein a tappet extends from the second arm in contact with the wedge.

15. The one-way clutch assembly according to 12 wherein the actuator member is radially moveable and wherein the wedge is axially moveable and wherein the linkage converts radial movement of the actuator member into axial movement of the wedge.

Description:
ADAPTABLE SELECTABLE ONE-WAY CLUTCH

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application

Serial No. 62/462,523 filed on February 23, 2017, and titled "Selectable One- Way Clutch with Improved Contamination Resistance," and U.S. Provisional Patent Application Serial No. 62/489,764 filed on April 25, 2017, and titled "Selectable One- Way Clutch with Improved Contamination Resistance," the entire disclosures of these applications are hereby incorporated by reference.

FIELD OF THE INVENTION

[0002] The present disclosure is generally related to overrunning coupling devices such as one-way clutches or brakes and, more specifically to selectable one-way coupling (SOWC) devices and/or electrically-controlled one way coupling (EOWC) devices equipped with an electromagnetic actuator module that is configured to be adaptable to various packaging requirements.

BACKGROUND OF THE INVENTION

[0003] This section provides background information related to the present disclosure which is not necessarily prior art.

[0004] Automatic transmissions provide a plurality of forward and reverse speed or gear ratios by selectively actuating one or more clutches and/or brakes to establish a torque- transmitting drive connection between a transmission input and a transmission output for supplying motive power (i.e., drive torque) from a powertrain to a driveline in a motor vehicle. One type of brake or clutch widely used in automatic transmission is an overrunning coupling device, commonly referred to as a one-way clutch (OWC), which overruns when one of its races (in radial coupling configuration) or one of its drive plates (in axial coupling configurations) rotates in a first (i.e., freewheel) direction relative to the other race or drive plate, and engages or locks in a second (i.e., lockup) direction. Typically, a locking member, such as a strut, associated with the one-way clutch is moveable between a non-deployed position to establish a freewheeling mode and a deployed position to establish a locked mode. The strut is commonly biased toward one of its two positions. Such conventional one-way clutches provide no independent control over their modes of operation, that is to say whether they lockup or freewheel in both directions and are commonly referred to as passive one-way clutches. Thus, basic one-way clutches provide the "locked" mode in one rotary direction and the "freewheel" mode in the opposite direction based on the direction that the drive torque is being applied to the input race or drive plate.

[0005] There are however, requirements in modern automatic transmissions where a "controllable" overrunning coupling device, commonly referred to as either a selectable one-way clutch (SOWC) or an electrically-controlled one-way clutch (EOWC), can be selectively controlled to provide additional functional modes of operation. Specifically, a controllable one-way clutch may further be capable of providing a freewheel mode in both rotary directions until a command signal (i.e., from the transmission controller) causes a power- operated actuator to shift the coupling device into its lockup mode. Thus, a controllable one-way clutch may be capable of providing a drive connection between an input member and an output member in one or both rotational directions and it may also be operable to freewheel in one or both directions. It is also known in modern automatic transmissions to integrate a passive oneway clutch and a controllable one-way clutch into a combined coupling device, commonly referred to as a bi-directional clutch.

[0006] In some instances, the selectable one-way clutches installed in automatic transmissions utilize a hydraulic actuator to selectively actuate the overrunning coupling and shift between the available operating modes. Examples of conventional selectable one-way clutches that are hydraulically-actuated are disclosed in U.S. Patent Nos. 6,290,044, 8,079,453 and 8,491 ,439. It is also known to use an electro-mechanical actuator with the electrically- controlled selectable one-way clutch, one example of which is disclosed in U.S. Patent No. 8,196,724. As a further alternative, much development has recently been directed to electromagnetic actuators for use with electrically-controlled selectable one-way clutches, examples of which are disclosed in U.S. Patent Nos. 8,276,725 and 8,418,825 and U.S. Publication 2013/0319810. In many electromagnetic actuators, a rocker-type locking element, commonly referred to as a strut, is pivoted from a first position to a second position in response to energization of a coil assembly. In some such electrically-controlled one-way clutches, a direct-acting configuration is used such that the strut is part of the magnetic circuit and its pivotal movement is caused by an attraction force applied directly to the strut via energization of the coil assembly. Therefore, precise control of the air gap established between the core/pole piece of the coil assembly and the magnetic strut is required to provide robust and reliable lockup functionality. As an alternative, some electrically-controlled one-way clutches are equipped with an electromagnetic actuator having an indirect-acting configuration in which an intermediate component, such as an armature or linkage, is arranged to cause pivotal movement of the strut via energization of the coil assembly. [0007] A known issue with electrically-controlled one-way clutches is that package space limitations make it difficult to locate the electromagnetic actuator within a vehicle transmission. Accordingly, a need exists to continue development of improved electromagnetic actuators for use in electrically-controlled one-way clutches that provide enhanced functionality and packaging.

SUMMARY OF THE INVENTION

[0008] This section provides a general summary of the disclosure and is not intended to be considered a comprehensive listing of all of its aspects, features and objectives.

[0009] It is an aspect of the present disclosure to provide a controllable one-way clutch assembly adapted for use in a power transmission device.

[0010] It is a related aspect to provide an electromagnetic actuator module for use with an electrically-controlled one-way clutch assembly having one of a direct or an indirect configuration provided between the energizeable coil assembly and a pivotably moveable locking element.

[0011] It is another related aspect to provide a one-way clutch assembly comprised of a clutch module and an electromagnetic actuator module having at least one electromagnetic actuator. The electromagnetic actuator includes the energizeable coil assembly, a pivotable locking strut, a coupling arrangement for mechanically moving the locking strut between released and locked positions relative to ratchet teeth formed on a clutch member associated with clutch module, and a latching mechanism for selectively latching the strut in its released position. [0012] In accordance with these and other aspects, the electromagnetic actuator is configured to include anti-deployment features operable to inhibit unintended movement of the locking strut toward its locked position in response to hydraulic fluid forces and/or fluid dynamics acting on the one-way clutch assembly within the power transmission device. The anti-deployment feature may include a latching mechanism integrated into the electromagnetic actuator. The latching mechanism is operable to hold the locking strut in its released position during operation of the one-way clutch assembly in a free-wheeling mode. The latching mechanism may be hydraulically-actuated.

[0013] In accordance with these and other aspect of the disclosure, a one-way clutch assembly is provided. The one-way clutch assembly includes a clutch module that has a first clutch component disposed about an axis and a second clutch component disposed about the axis and arranged for rotation relative to the first clutch component about the axis. The second clutch component has ratchet teeth. An electromagnetic actuator module is mounted to the first clutch component. The electromagnetic actuator module has an energizeable coil assembly that has a moveable actuator member, a locking member operably connected to the actuator member, and a latching mechanism. The actuator member is moveable from a first position to a second position in response to energization of the coil assembly for causing concurrent movement of the locking member from a released position disengaged from the ratchet teeth to a locked position engaged with the locking teeth. The actuator member is axially moveable between the first and second positions. The latching mechanism is radially moveable between the latching position and the released position. Axial movement of the actuator member from the first position into the second position causes radial movement of the latching mechanism from the released position into the latching position. [0014] According to this aspect of the disclosure, the one-way clutch assembly may be utilized where radial actuation is not practical due to packaging limitations.

[0015] According to another aspect of the disclosure, another one-way clutch assembly is provided. The one-way clutch assembly includes a clutch module having a first clutch component disposed about an axis and a second clutch component disposed about the axis and arranged for rotation relative to the first clutch component about the axis. The second clutch component has ratchet teeth. An electromagnetic actuator module is mounted to the first clutch component. The electromagnetic actuator has an energizeable coil assembly having a moveable actuator member, a locking member operably connected to the actuator member, and a latching mechanism. The actuator member moves from a first position to a second position in response to energization of the coil assembly for causing concurrent movement of the locking member from a released position disengaged from the ratchet teeth to a locked position engaged with the locking teeth. A wedge is positioned radially between the first clutch component and the locking member and is moveable in response to axial movement of the actuation member to cause the movement of the locking member between the released position and the locked position.

[0016] According to this aspect of the disclosure, the wedge provides for a compact and simple mechanism for providing movement of the locking member.

[0017] According to this aspect of the disclosure, the actuation member may be positioned axially in line with, or offset from the locking member, thus making the one-way clutch assembly adaptable for various packaging requirements.

[0018] Further areas of applicability of the present disclosure will become apparent from the detailed description, drawings and specific example provided hereinafter. It should be understood that the detailed description, drawings and specific examples, while indicating preferred embodiments of the present disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for illustrative purposes only of selected embodiments and are not intended to limit the scope of the present disclosure. The inventive concepts associated with the present disclosure will be more readily understood by reference to the following description in combination with the accompanying drawings wherein:

[0020] FIG. 1 is an exploded perspective view of a bi-directional clutch assembly configured to include a passive one-way clutch and a controllable one-way clutch having an electromechanical actuator module and to which the inventive concepts of the present disclosure are applicable;

[0021] FIGS. 2 is a partial sectional views of an alternative version of a bidirectional clutch assembly configured to include a constant backlash arrangement between the struts of the passive and controllable one-way clutches;

[0022] FIG. 3 is a perspective view of an embodiment of an electromagnetic actuator module for use in the controllable one-way clutch assemblies of the present disclosure, wherein the electromagnetic actuator module includes an active strut having a plunger ramp that is axially engageable by a moveable plunger;

[0023] FIG. 4 is a perspective view of the active strut of the electromagnetic actuator module of FIG. 3; [0024] FIG. 5 is a side cross-sectional view of another electromagnetic actuator module for use in the controllable one-way clutch assemblies of the present disclosure including an axially moveable wedge for providing movement of an active strut;

[0025] FIG. 6 is a side cross-sectional view of another electromagnetic actuator module for use in the controllable one-way clutch assemblies of the present disclosure including a ratchet spring positioned radially between an axially moveable wedge and an outer race;

[0026] FIG. 7 is a side cross-sectional view of another electromagnetic actuator module for use in the controllable one-way clutch assemblies of the present disclosure including a linearly extending linkage for translating radial movement of a plunger into axial movement of a wedge;

[0027] FIG. 7A is a rear view of the linkage of FIG. 7 received by a channel of the plunger;

[0028] FIG. 7B is a perspective view of the plunger of FIG. 7; and

[0029] FIG. 8 is a side cross-sectional view of another electromagnetic actuator module for use in the controllable one-way clutch assemblies of the present disclosure including a linkage for translating radial movement of a plunger into axial movement of a wedge; wherein the linkage includes a first leg extending at an angle relative to a second leg.

DESCRIPTION OF THE ENABLING EMBODIMENTS

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. In general, each embodiment is directed to a overrunning coupling device having at least a controllable one-way locking device (i.e. brake and/or clutch) including a moveable locking component (i.e. sprag, strut, etc.) that is controlled via an electromagnetic actuator. Thus, the controllable one-way locking device transmits torque mechanically but is actuated via an electrical actuation system. However, these example embodiments only are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well- known processes, well-known device structures, and well-known technologies are not described in detail.

[0050] Referring to FIG. 1, an example embodiment of a bi-directional clutch assembly 20 is generally shown in an exploded view. Bi-directional clutch assembly 20 is of a type adapted, for example, for use in an automatic transmission which is controlled using an on-off relay to actuate a friction clutch assembly. Clutch assembly 20 includes a "controllable" overrunning coupling device, commonly referred to as an electrically-controlled one-way clutch (EOWC). For purposes of this application, the term "clutch assembly" should be interpreted to include couplings, clutches and brakes wherein one component is drivingly connected to a torque delivery component of the transmission while the other component is drivingly connected to another torque delivery component or is non-rotatably fixed to a transmission housing or other stationary component.

[0051] As will be detailed, bi-directional clutch assembly 20 is shown in this non- limiting embodiment to generally include a first clutch member or outer race, a second clutch member or inner race, a passive one-way clutch having a plurality of passive struts, and a controllable one-way clutch having at least one active strut assembly and electromagnetic actuator, cumulatively defining an electromagnetic actuator module. Clutch assembly 20 also includes a clutch module comprised of outer race 22 and inner race 36. Outer race 22 includes an outer ring segment 24 and an inner ring segment 26 that are spaced radially from one another and interconnected via a radial web segment 27. Outer ring segment 24 includes a plurality of outer lugs 28 that extend radially outwardly for mating with a first component. The first component can be a stationary component (such as a housing of a transmission) or a rotary component (such as a shaft). The outer ring segment 24 further includes a pair of protrusions 30 that extend radially outwardly. Each of the protrusions 30 defines a radially extending actuator pocket 32 and a strut pocket 33. It should be appreciated that more or fewer protrusions 30 could be utilized and that they may be formed integrally with outer race 22 rigidly secured thereto. The inner ring segment 26 includes a plurality of inner ramp surfaces, hereinafter referred to as inner ratchet teeth 34, which extend radially inwardly and are evenly distributed about the axis A.

[0052] As noted, the clutch module of clutch assembly 20 also includes inner race

36 that extends annularly about the axis A. The inner race 36 has an outer rim 38 and an inner rim 40 that are spaced radially from one another. The outer rim 38 is disposed radially between the outer and inner ring segments 24, 26 of the outer race 22, and the inner rim 40 is disposed radially inwardly from the inner ring segment 26 of the outer race 22. The inner rim 40 of the inner race 36 presents a plurality of inner lugs 42 that extend radially inwardly for mating with a second component (typically a rotary component). Commonly, lugs 42 interconnect a shaft or clutch plates for rotation with inner race 36. Further, the outer rim 38 of the inner race 36 includes a plurality of outer ramp surfaces, hereinafter referred to as outer ratchet teeth 44, which extend radially outwardly and are evenly distributed about the axis A.

[0053] The passive one-way clutch includes a plurality of passive locking elements, hereinafter passive struts 46, which are supported in strut apertures formed in the inner race 36 for pivotal movement between a locking position and an unlocking position. In the locking position, the passive struts 46 engage the inner ratchet teeth 34 of the outer race 22 for coupling the outer and inner races 22, 36 to one another during counter-clockwise rotation of the inner race 36 relative to the outer race 22. Therefore, engagement by one or more of the passive struts 46 prevents relative rotation of the outer and inner races 22, 36 in the counter-clockwise direction. However, the passive struts 46 still allow relative rotation, i.e., overrun, in the clockwise direction when located in the locked position since they ratchet over the ramped profile of the inner ratchet teeth 34. In the unlocking position, the passive struts 46 are radially spaced from the inner ratchet teeth 34 of the outer race 22, therefore also allowing counterclockwise rotation of the inner race 36 relative to the outer race 22.

[0054] In association with the controllable one-way clutch, an electromagnetic actuator module includes an active strut assembly 48 and an electromagnetic actuator 51. One active strut assembly 48 is disposed within each of the strut pockets 33 formed in the outer ring segment 24. Each active strut assemblies 48 includes an active locking element, hereinafter an active strut 50, that is selectively pivotal between a locked (deployed) and an unlocked (non- deployed) position. In the locked position, the active strut 50 lockingly engages the outer ratchet teeth 44 of the inner race 36, thereby locking the outer and inner races to one another during clockwise movement of the inner race 22 relative to the outer race 22. However, the active strut 50 still allows relative displacement, i.e., overrun, in the counter-clockwise direction. In the unlocked position, the active strut 50 is radially spaced from the outer ratchet teeth 44, thereby allowing the inner and outer races 22, 36 to rotate relative to one another. Furthermore, each of the active strut assemblies 48 also includes an armature 60 that is disposed adjacent to the active strut 50 for providing the pivotal movement of the active strut 50. Thus, the active strut assemblies 48 define an "indirect" actuation arrangement.

[0055] The electromagnetic actuator module associated with the controllable oneway clutch also includes a pair of the electromagnetic actuators 51, each including a coil assembly 52 mounted in the actuator pocket 32 and being radially spaced from the active strut 50 and the armature 60. The coil assembly 52 includes a core 54 of a magnetically permeable material, a bobbin 56 disposed about the core 54, and a wire coil 58 wrapped about the bobbin 56. Furthermore, the armature 60 is disposed between the active strut 50 and the coil 58 for pivoting toward the core 54 in response to energization of the coil 58 and thus providing the pivotal movement of the active strut 50. Armature 60 can be made of a magnetic material so as to be magnetically attracted to core 54 upon energization of coil 58 or made of a non-magnetic material so as to be mechanically-coupled to a moveable component (solenoid) in alternative actuators 51.

[0056] In a preferred but non-limiting arrangement, when voltage and/or current are applied to the coils 58, the coils 58 become an electromagnet producing an electric field (or flux). The flux flows outwards in all directions and transfers through the small air gap between the armature 60 and core 54 in the center of the coil assembly 52. The core 54 becomes magnetized, therefore attracting the armature 60 towards the core 54. The resulting motion of the armature 60 forces the active strut 50 to mechanically deploy due to the mechanical linkage between the active strut 50 and the armature 60. Upon deployment, the active strut 50 moves from its unlocked position to its locked position where it locates itself against one of the outer ratchet teeth 44 of the inner race 36, effectively locking the inner race 36 from rotating in that direction. Disengagement occurs as voltage and/or current is removed from the coil assembly 52, wherein the armature 60 is demagnetized and free from the coil assembly 52. A biasing member, such as a strut return spring (not shown), is positioned between the active strut 50 and the outer race 22, causing the active strut 50 to move back to its unlocked position during disengagement.

[0057] It should be appreciated that the arrangement of the armature 60, active strut 50, and coil assembly 52 can act to apply a locking force in a radial direction (as shown in FIG. 1) or an axial direction, depending on the layout and/or requirements of the clutch assembly 20. Radially stacked clutch assembly 20 offers packaging advantages over its axial counterparts in situations where axial space is tight, e.g., in automatic transmissions. Further, radially applied clutches transmit driving torque directly outwards to be grounded against the transmission housing without the fear of forces being directed axially which could cause problems for the sizing of other system components to compensate for axial force.

[0058] A lead frame 62 is attached to each of the electromagnetic actuators 51 for electrically connecting the coils 58 to one another for coordinated energization of the coils 58. It should be appreciated that the lead frame 62 could connect any number of coils 58. A printed circuit board (PCB) is attached to the lead frame 62 for selectively controlling the energization of the coils 58. The printed circuit board is disposed radially and axially adjacent to one of the coils 58. The lead frame 62 further includes at least one power output contact that is disposed radially and axially adjacent to each of the coils 58 for electrically connecting to the coils 58 to provide power to the coils 58. Any number of power contacts could be utilized to power any number of coils 58. The lead frame 62 also includes a wire harness that extends from the circuit board for connecting to a transmission control module (TCM) or a powertrain control module (PCM) for transmitting data to the circuit board and to power the circuit board. Additionally, the lead frame 62 includes a plastic encapsulation or casing that is disposed about the circuit board and the wires for protecting the circuit board and the wires for allowing the lead frame 62 to be submerged in Automatic Transmission Fluid and operate in -40C to +140C temperatures. It should be appreciated that the aforementioned configuration of the lead frame 62 and associated components provide a low-cost, modular solution that provides for a more simplified manufacturing process.

[0059] The applied voltage to the coils 58 is comprised of a High Side and Low

Side and is supplied by the TCM or the PCM of a vehicle. The High Side (HS) is typically a shared power supply with other loads, and the Low Side is typically a discrete channel (LSD) that controls the discrete/individual circuit. The LSD is capable of controlling the amount of current across the coils 58. Since the LSD is typically located in the TCM/PCM, there is a requirement to have a wire harness between the electromagnetic actuators 51 and the TCM/PCM. If the wire harness suffers mechanical damage and the electromagnetic actuators 51 discrete LSD channel is "short circuited -to chassis ground", the coils may become energized. Accordingly, an Integrated High Side Fail Safe Switch (HSFSS) is provided to add another level of logic in order to control the shared High Side supply. The HSFSS is comprised of the Printed Circuit Board 64 (PCB), a High Side Switch (not shown), a transistor (not shown), and passive components (not shown). They are electrically connected to the lead frame 62. It should be appreciated that the configuration of the lead frame 62 protects the integrated electronic components (including the HSFSS), and provides improved packaging and reduced wiring. Furthermore, it should be appreciated that the modular configuration of the lead frame 62 and associate components could be utilized on other clutch assembly configurations, e.g., axially engaging clutch assemblies. The HSFSS is controlled by the OWCC_HS_ENABLE, which enables the HSFSS to pass current to the coils 58.

[0060] Referring initially to FIG. 2, another non-limiting embodiment of a bidirectional clutch assembly 100 is shown. The clutch assembly 100 also includes a clutch module and at least one electromagnetic actuator module. The clutch module includes an outer race 102 that extends annularly about an axis A. The outer race 102, or first clutch component, presents an outer ring segment 104 and an inner ring segment 106 that are spaced radially from one another. The outer ring segment 104 includes a plurality of outer lugs 108 that extend radially outwardly for mating with a first component. The first component can be a stationary component (such as a housing of a transmission) or a rotary component (such as a shaft). The outer ring segment 104 further includes a pair of protrusions 110 that extend radially outwardly. Each of the protrusions 110 defines a radially extending actuator pocket 112 and a strut pocket 113. It should be appreciated that more or fewer protrusions 110 could be utilized. The inner ring segment 106 presents a plurality of ramped inner ratchet teeth 114 that extend radially inwardly and are evenly distributed about the axis A.

[0061] The clutch module of the clutch assembly 100 further includes an inner race 116 that also extends annularly about the axis A. The inner race 116, or second clutch component, has an outer rim 118 and an inner rim 120 that are spaced radially from one another with the outer rim 118 disposed radially between the outer and inner ring segments 104, 106 of the outer race 102, and the inner rim 120 disposed radially inwardly from the inner ring segment 106 of the outer race 102. The inner rim 120 of the inner race 116 presents a plurality of inner lugs 122 that extend radially inwardly therefrom for mating with a second component (typically a rotary component). Further, the outer rim 118 of the inner race 116 presents a plurality of ramped outer ratchet teeth 124 that extend radially outwardly and are evenly distributed about the axis A.

[0062] The passive one-way clutch associated with bi-directional clutch assembly

100 includes six passive struts 126 that are pivotably supported by inner race 116. It should be appreciated that more or fewer passive struts 126 could alternatively be utilized. The passive struts 126 are moveable for engaging the inner ratchet teeth 114 on the inner ring segment 106 of the outer race 102 for preventing relative displacement of the inner and outer races 116, 102 in the counter-clockwise direction. However, the passive struts 126 allow relative displacement i.e., overrun, between the inner and outer races 116, 102 in the clockwise direction.

[0063] In the controllable one-way clutch associated with bi-directional clutch assembly 100, each electromagnetic actuator module includes an active strut assembly 128 and an electromagnetic actuator 133 (schematically shown in FIG. 2). Each active strut assembly 128 is received in a corresponding one of the strut pockets 113 of the outer ring segment 104. Each of the active strut assemblies 128 includes an active strut 130 that is selectively pivotal between a locked (deployed) and an unlocked, released (non-deployed) position. In the locked position, the active struts 130 engage the outer ratchet teeth 124 on the inner race 116, to prevent relative displacement of the inner and outer races 102, 116 in the clockwise direction. However, the active struts 130 allow relative displacement, in the counter-clockwise direction. In the unlocked position, the active struts 130 are radially spaced from the outer ratchet teeth 124, allowing the inner and outer races 116, 102 to rotate relative to one another.

[0064] The combination of the passive and active struts 126, 130 provide for a bidirectional configuration of the clutch assembly 100 that allows engagement in two opposite directions (clockwise and counter-clockwise). It should be appreciated that this concept is also applicable in axially oriented configurations.

[0065] Referring to FIGS. 3-4, an alternative embodiment of an electromagnetic actuator module 104 A configured for use with clutch module 102 A within a controllable clutch 100A is provided. According to this embodiment, electromagnetic actuator 134A includes coil assembly 154 A with a linearly moveable plunger 140 A extending axially from outer race 106 A of clutch module 102A to move active strut 136A between its deployed (FIG. 3) and non- deployed (not shown) positions in response to energization of coil assembly 154A. Active strut 136A defines a plunger ramp 145A (FIG. 4) on a side of strut segment 182A. More particularly, the active strut 136A has a side wall 137A that extends generally along a plane that is perpendicular to the axis. The side wall 137A defines the plunger ramp 145A, and the plunger ramp 145A is angled relative to the sidewall 137A. Linearly moveable plunger 140A has an end segment 141A that is axially aligned with the plunger ramp 145A for engaging plunger ramp 145A of strut segment 182A. Movement of linearly moveable plunger 140A to an extended position (FIG. 3) results in an actuation force acting on plunger ramp 145A of strut segment 182A for causing active strut 136A to pivot about pivot post segment 180A to its deployed position with its end segment 184A engaged with one of ratchet teeth 122G on inner race 108A. Because plunger ramp 145A of strut segment 182A is sloped or angled (i.e., includes a suitable inclined plane feature), linear movement of plunger 140A to an extended position causes end segment 741A to engage plunger ramp 145A and displace active strut 136A about pivot post segment 180A. Linearly moveable plunger 140A is positioned strategically in between a hard stop or non-deployed position of the active strut 136A. As a result of plunger ramp 145A, the linearly moveable plunger 140A wedges itself between the housing (i.e., outer race 106A) and active strut 136A to rotate active strut 136A out of its non-deployed position and into its deployed position. As the linearly moveable plunger 140A is retracted (when coil assembly 154A is de-energized), a torsion-type spring (e.g., torsion-type spring 147A, schematically shown in FIG. 4) disposed in spring pocket 143 A of active strut 136A. As shown in FIGs. 1-2, more than one active strut 136A may be utilized.

[0066] Referring to FIGS. 5, another alternative embodiment of an electromagnetic actuator module 251A that is configured for use with a clutch module 202A within a controllable clutch is provided. The electromagnetic actuator module 251A includes a wedge 252A positioned radially between outer race 206A (first clutch member), and locking member 236A (active strut). The wedge 252A includes a body 254A that extends generally perpendicularly to the axis, and a tapered leg 256A that extends axially from the body 254A between the outer race 206A and the locking member 236A. The tapered leg 256A tapers inwardly as it extends axially from the body 245A. The wedge 252A is positioned in axial aligned and abutting relationship with actuation member 240 A (plunger). The actuation member 240A is axially moveable between first and second positions. Movement of the actuation member 240A from the first position into the second position causes the tapered leg 256A of the wedge 252A to be driven between the outer race 206A and the locking member 236A, thereby causing pivoting / radial movement of the locking member 236A between the released position and the locked position. The outer race 206A further defines a guidance slot 258A that extends axially therein. The wedge 252A further includes a guidance leg 260A that extends axially from the body 254A into the guidance slot 258A for axially guiding the wedge 252A as it moves axially toward and away from the first clutch component 206A. Furthermore, a biasing member 247A is positioned between the body 254A of the wedge 252A and the outer race 206A and axially biases the wedge 252A toward the actuation member 240A to bias the locking member in its released position. The biasing member 247A is received by a spring channel 262A defined by the outer race 206A.

[0067] Referring to FIG. 6, another alternative embodiment of an electromagnetic actuator module 25 IB that is configured for use with a clutch module 202B within a controllable clutch is provided. The embodiment of the electromagnetic actuator module 251B of FIG. 6 is similar to that of FIG. 5, but also includes a generally flat ratcheting spring 264B that is positioned radially between the tapered leg 256B of the wedge 252B and the outer race 206B. The ratcheting spring 264B provides for ratcheting of the first clutch component 236B as it moves toward the locked position.

[0068] It should be appreciated that the aforementioned electromagnetic actuator modules 104A, 251A, 251B of FIGs. 3-6 may advantageously be utilized where radial actuation is not practical due to package limitations. This is because axial movement of the actuator module 251B is configured to radially move locking member 136A, 236A, 236B. Furthermore, it should be appreciated that the wedges 252A, 252B of FIGs. 5-6 advantageously allow the actuation member 240A, 240B to be positioned inline or offset from the locking member 236A, 236B, thus providing various packaging options depending on the specific application at hand. It should further be appreciated that the wedges 252A, 252B of the embodiments of FIGs. 5-6 could be integrally incorporated into the actuation member 240A, 240B instead of being separate components.

[0069] Referring to FIGs. 7-7B, another alternative embodiment of an electromagnetic actuator module 251 C that is configured for use with a clutch module 202C within a controllable clutch is provided. This embodiment of the electromagnetic actuator module 251 B is also similar to those shown in FIGs. 5-6, but the actuation member 240B is positioned such that it is radially moveable, and the electromagnetic actuator module 251 C is configured such that radial movement thereof causes axial movement of the wedge 252C. In order to translate radial movement of the actuation member 240B into axial movement of the wedge 252C, a linkage 266C is positioned between the actuator member 240B and the wedge 252C. The linkage 266C extends linearly between a first end 268C that engages the wedge 252C and a second end 270C that is coupled with the actuation member 240B. The linkage 266C is rotatable about pivot point at a pivot pin 272C between the first and second ends 268C, 270C such that the linkage 266C rotates about the pivot pin 272C in response to movement of the actuator member 240B to cause movement of the wedge 252C. The linkage 266C defines a slot 274C which receives the pivot pin 272C to allow translational movement of the linkage 266C relative to the pivot pin 272C in addition to pivoting movement of the linkage 266C. According to this embodiment, the actuation member 240B extends to terminal end 276C. A channel 278C extends from the terminal end 276C of the actuation member 240B toward the coil assembly 234B. Furthermore, the second end 270C of the linkage 266C is received by the channel 278C of the actuation member 240B. The actuation member 240B also defines a pair of orifices 280C on opposite sides of the channel 278C in alignment with one another. The linkage 266C further defines a pair of posts 282C adjacent the second end 270C. The posts 282C are received by the orifices 280C of the actuation member 240B to provide pivoting movement of the linkage 266C relative to the actuation member 240B.

[0070] Referring to FIG. 8, another alternative embodiment of an electromagnetic actuator module 251D that is configured for use with a clutch module 202D within a controllable clutch is provided. The embodiment of FIG. 8 is similar to that of FIG. 7, but the linkage 266D has a first arm 284D that engages the actuation member 240B, and a second arm 286D that extends at an angle relative to the first arm 284D. Furthermore, according to this embodiment, the pivot pin 272D is received at an intersection between the first and second arms 284D, 286D. Additionally, a tappet 288D extends from the second arm 286D, in perpendicular relationship with the second arm 286D, and in contact with the wedge 252D. According to this embodiment, the actuation member 240B abuts the linkage 266D, rather than being coupled with the linkage 266D as described with regard to the embodiment of FIGs. 7-7B.

[0071] It should be appreciated that the aforementioned actuator modules 251C,

251D of FIGs. 7 and 8 could be mounted to either a clutch or transmission housing, depending on specific needs. It should also be appreciated that the aforementioned wedges 252A, 252B, 252C, 252D of FIGs. 5-8 could be made of various materials including, but not limited to metals and plastics.

[0072] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varies in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of disclosure.