The present invention relates to a pump unit for pressurising a hydraulic actuating system, in particular for an automotive appliance, more in particular for actuating a convertible roof system. The pump unit comprises a pump housing including a pump chamber for housing a rotary piston pump. The piston pump comprises a stator which is stationary positioned inside the pump chamber. The stator has a longitudinal body which defines an axial axis of the pump unit. The stator includes at least two channels which respectively serve as an inlet or outlet channel. The piston pump further comprises a rotor. The rotor is positioned around the stator. The rotor has a rotor body which is driveable in a rotational direction about the axial axis. The rotor body includes several cylinder holes for receiving pistons. The pistons are slidable with respect to the rotor body in a radial direction. Further, the piston pump comprises an eccentric ring. The eccentric ring is positioned around the rotor body. The eccentric ring is movable positioned with respect to the rotor body to provide an adjustable eccentricity in between an outer circumferential rotor surface of the rotor body and an inner running surface of the eccentric ring. The eccentricity is adjustable by a ring actuator.

NL1012064 discloses such a pump unit implemented in a hydraulic actuating system for operating a convertible roof system. The hydraulic actuating system comprises a hydraulic pump, a driving motor for driving the pump, a reservoir for collecting hydraulic liquid and one or more hydraulic cylinders which engage to the components of the convertible roof system.

The hydraulic pump is a so called rotary piston pump which is arranged for supplying hydraulic liquid to the at least one cylinder. The rotary piston pump comprises a rotor including a rotor body. The rotor is driveable by the driving motor. The rotor body comprises several rotor pistons which are movable in a radial direction. The rotary piston pump further comprises an eccentric ring. The eccentric ring circumvents the rotor. The eccentric ring is displaceable with respect to the rotor body over a predetermined distance to set an eccentricity.

The hydraulic actuating system further comprises control means which are arranged to control a pump capacity of the rotary piston pump. The control means include an actuator which engage to the eccentric ring of the rotary piston pump to adjust the eccentricity of the eccentric ring. GB 812.812A discloses a pump which comprises a housing for a rotor with pistons and a movable track ring. The rotor and track ring are arranged in a cylindrical recess of the housing. The track ring is enabled by a pivot pin to swing from one side of the recess to the other under the action of a control piston. The control piston is aligned with the track ring. The control piston is positioned opposite a circumferential outer surface of the track ring. A thimble is arranged to act in a position to the control piston on the opposite side of the track ring.

A problem to the disclosed rotary piston pump is that the hydraulic pump requires a large built- in space. In modern vehicles, an available built-in space for installing a pump unit is getting more and more smaller.

The general object of the present invention is to at least partially eliminate the above mentioned drawbacks and/or to provide a useable alternative. More specific, it is an object of the invention to provide a relatively small pump unit which can be installed in relatively small built-in spaces. More in particular, the invention aims to provide a convertible roof system for a vehicle which has an hydraulic actuating system including a pump unit which can be built-in into small chassis compartments of the vehicle.

According to the invention, this object is achieved by a pump unit according to claim 1.

According to the invention a pump unit is provided for pressurising a hydraulic actuating system, in particular for actuating a convertible roof system. The pump unit comprises a pump housing including a pump chamber for housing a rotary piston pump. The piston pump comprises a stator which is stationary positioned inside the pump chamber. The stator has a longitudinal body which defines an axial axis of the pump unit. The stator includes at least two channels which respectively serve as an inlet or outlet channel. The piston pump further comprises a rotor. The rotor is positioned around the stator. The rotor has a rotor body which is driveable in a rotational direction about the axial axis. The rotor body includes several cylinder holes for receiving pistons. The pistons are slidable with respect to the rotor body in a radial direction. Further, the piston pump comprises an eccentric ring. The eccentric ring is positioned around the rotor body. The eccentric ring is movable positioned with respect to the rotor body to provide an adjustable eccentricity in between an outer circumferential rotor surface of the rotor body and an inner running surface of the eccentric ring. The eccentricity is adjustable by a ring actuator.

The invention provides an improvement by providing a ring actuator including an actuator for displacing the eccentric ring with respect to the rotor body, wherein the actuator is positioned relative to the eccentric ring in a manner to achieve a compact configuration of the piston pump. The actuator is positioned relative to an end face of the eccentric ring and relative to an outer ring contour formed by an outer circumferential surface of the eccentric ring. According to the invention the actuator is mated with the end face of the eccentric ring. The actuator is positioned opposite the end face of the eccentric ring. The actuator is in the axial direction spaced at a distance from the end face of the eccentric ring. Seen in an axial projection, the actuator engages the eccentric ring at a position within said outer ring contour.

The spatial arrangement of the actuator with respect to the eccentric ring of the piston pump contributes to a compact configuration. The piston pump allows a slim design of a pump housing which requires less built-in space. Advantageously, such a compact pump unit can be built-in into narrow spaces, like a small compartment of a vehicle chassis. Advantageously, the pump unit according to the invention is in particular suitable to be implemented in a hydraulic actuating system of a convertible roof system.

In an embodiment of the pump unit according to the invention, the eccentric ring comprises a lever. The lever is positioned at the end face of the eccentric ring. The lever may have a longitudinal lever body, wherein one end of the lever is connected to the end face of the eccentric ring and wherein an opposite end of the lever is in engagement with the ring actuator.

Advantageously, the lever allows a further compact configuration of the piston pump. In comparison with a yoke structure, the lever is a small component which may only extend in the axial direction, such that the lever does not require a built-in space in the radial direction.

In an embodiment of the pump unit according to the invention are the end face of the eccentric ring is a ring actuator and face which is positioned opposite a motor end face of the eccentric ring. Herewith, in an assembled configuration of the pump unit, the eccentric ring is positioned in between a motor and the ring actuator. The motor may be mounted to a front side of the pump housing, wherein the piston pump including the eccentric ring is mounted inside a pump chamber behind the motor and wherein subsequently the ring actuator is positioned behind the eccentric ring. The motor, eccentric ring and ring actuator are spatially arranged in series in the axial direction.

In an alternative embodiment of the pump unit according to invention, the ring actuator may be positioned in front of the eccentric ring. The ring actuator may be positioned in between the eccentric ring and the motor in an assembled configuration of the pump unit. Both

embodiments may provide a compact configuration of the pump housing in the radial direction, since the actuator is in engagement with the eccentric ring at a point of engagement which is positioned within the outer ring contour of the eccentric ring.

In an embodiment of the pump unit according to the invention, the eccentric ring is swingable about a pivot with respect to the rotor body. The pivot is eccentrically positioned with respect to the rotor body. The pivot is radially positioned at a distance with respect to the axial axis of the pump unit. The pivot is oriented in parallel with the axial axis. In comparison with a linear translation provided by a linear guidance element, the pivot allows a further compact configuration of the pump unit.

In an embodiment of the pump unit according to invention, the pivot is formed by a shaft. The shaft is positioned at the end face of the eccentric ring. In particular, the shaft and lever are both positioned at the same end face of the eccentric ring. The shaft is positioned at a point which is positioned within the outer ring contour of the eccentric ring. The shaft is angularly spaced from the lever. Preferably, the pivot is angularly spaced about a centre over at least 100°, in particular over about 180°, from the lever. Advantageously, the pivot formed by the shaft further contributes to a compact configuration of the pump unit in a radial direction.

In an embodiment of the pump unit according to the invention, the ring actuator is a passive element which can be adjusted by an operator. The ring actuator may be a screw type actuator which can be manually set by an operator. By screwing the actuator, the eccentric ring may be set at a certain position to obtain a predetermined eccentricity.

In an embodiment of the pump unit according to the invention, the ring actuator is connected to a control unit of the pump unit. The control unit may be an electronic control unit.

Alternatively, the control unit may be a hydraulic control unit. The control unit may include hydraulic valves and conduits which are arranged for controlling the ring actuator. The ring actuator is controllable. Instead of a passive once set actuator, the ring actuator is an active actuator which means that the actuator is driveable by a motor or hydraulic pressure to obtain a momentaneous setting. The actuator is controllable to adjust an eccentricity of the eccentric ring with respect to the rotor body during an operation of the pump unit. Advantageously, such an actively controllable ring actuator allows an adjustment of a pump capacity during an operation.

In an embodiment of the pump unit according to the invention, the actively controllable ring actuator may comprise a spindle element. By rotationally driving the spindle element, e.g. by using a servo motor, the ring actuator may be adjusted and the eccentric ring can be set to a predetermined eccentricity. In an embodiment of the pump unit according to the invention, the actuator of the ring actuator is a single acting hydraulic cylinder. The single acting hydraulic cylinder can be acted by supplying hydraulic liquid. In comparison with a double acting hydraulic cylinder, the single acting hydraulic cylinder may have a relative small outer diameter which contributes to a compact configuration of the pump unit. The ring actuator may further comprise a biasing member to provide a pre-tension to the actuator. The biasing member may for example be formed by a spiral spring. Preferably, the biasing member and the actuator are positioned at a same side of the eccentric ring. Preferably, the biasing member is positioned opposite the actuator. The biasing member and the actuator may be positioned in a common imaginary plane at one side of the eccentric ring. In particular, the biasing member is aligned with the actuator.

Further, the invention relates to an assembly of the pump unit in which the pump unit further comprises a motor for driving the rotor body of the piston pump. The motor is mountable to a front side of the pump housing. Preferably, the pump housing is block shaped. The rotor body includes a link for connecting the motor to the rotor body. The eccentric ring is preferably positioned in between the motor and the ring actuator.

Further, the invention relates to a hydraulic actuating system comprising a pump unit according to the invention. Advantageously, the hydraulic actuating system is suitable to be built-in into narrow spaces, like frame compartments. Additionally, the compact configuration allows the hydraulic actuating system to be installed invisible from the outside behind movable components, e.g. in a medical device behind furniture parts like hospital beds.

The hydraulic actuating system is in particular an automotive hydraulic actuating system, comprising a pump unit according to the invention. Advantageously, the pump unit includes a rotary piston pump which is suitable to operate silently and reliable at a high rotational speed. The pump unit is in particular an automotive pump unit configured for operating vehicle parts, like a convertible roof, sunroof, boot lid, hood lid, spoiler or a vehicle wheel suspension.

Advantageously, the automotive pump unit has a compact configuration which allows an installation of the pump unit in a narrow vehicle compartment, like a chassis compartment which is positioned close to the movable vehicle part.

In an embodiment of the automotive actuating system, the automotive actuating system is a convertible roof system which comprises a convertible roof including a roof part which is movable with respect to a remaining roof part. The convertible roof to be operated serves to selectively cover or open a passenger space of a vehicle and may include several roof part which are pivotally connected to each other. The first roof part is movable with respect to a second roof part to bring the convertible roof in respectively a closed or open state.

In an embodiment of the automotive actuating system, the automotive actuating system is a vehicle wheel suspension. The vehicle wheel suspension comprises a linkage and at least one hydraulic cylinder for actuating a link of the linkage to allow an active control of the vehicle wheel suspension.

Further, the invention relates to a vehicle comprising an automotive hydraulic actuating system. The vehicle includes an automotive hydraulic actuating system which comprises a pump unit according to the invention and which pump unit is configured to move vehicle parts, like a link of a wheel suspension or a roof part of a convertible roof.

Further embodiments are defined in the dependent claims.

The invention will be explained in more detail with reference to the appended drawings. The drawings show a practical embodiment according to the invention, which may not be interpreted as limiting the scope of the invention. Specific features may also be considered apart from the shown embodiment and may be taken into account in a broader context as a delimiting feature, not only for the shown embodiment but as a common feature for all embodiments falling within the scope of the appended claims, in which:

Fig. 1 shows a schematic side view of a vehicle provided with a convertible roof system; Fig. 2 shows in a schematic perspective view an hydraulic actuating system of the convertible roof system from Fig. 1 ;

Fig. 3 shows in a schematic view a rotary piston pump with an actuator; and

Fig. 4 shows in a perspective view a spatial arrangement of the actuator with respect to an eccentric ring of the piston pump.

In the figures, the same reference numbers are used to indicate identical or similar

components.

Fig. 1 discloses in a schematic view a vehicle 1. The vehicle 1 comprises an automotive actuating system for hydraulically actuating movable vehicle parts, like a sunroof, hood lid, boot lid, spoiler, wheel suspension or a convertible roof. As illustrated here, the vehicle 1 is provided with a convertible roof system 2 for selectively opening or covering a passenger space. The convertible roof system 2 has a well known mechanical structure.

Here, the convertible roof system 2 has a convertible roof 20 which includes a front roof part 3. The roof part 3 is pivotally connected about a pivot axis to a remaining roof part 6 of the convertible roof 20. Here, the front roof part 3 is shown released from a front window frame 7. In a closed configuration of the convertible roof, the front roof part 3 is connected to the front window frame 7 and locked by a locking member 8.

Fig. 2 shows an embodiment of a convertible roof system 2 in further detail. The general mechanical structure of such a comfortable roof system is well known in the art. Fig. 2 further shows a hydraulic actuating system 21. The hydraulic actuating system 21 is arranged to actuate the convertible roof 20, locking member 8 and additionally a cover plate 22 . The cover plate 22 is provided to cover a compartment of the vehicle 1 which compartment is configured to receive the convertible roof 20 when transformed into an open configuration.

The hydraulic actuating system 21 comprises two pairs of hydraulic cylinders 23, 23'; 24, 24' for moving the roof parts 3, 6 of the convertible roof 2. A hydraulic cylinder 25 is provided to move the cover plate 22 and a hydraulic cylinder 36 is provided to actuate the locking member 8. The cylinders 23-25, 36 are hydraulically connected by hydraulic conduits to a hydraulic pump unit 26.

Seen from the outside, the pump unit 26 has a commonly known structure. The pump unit 26 has a pump housing 261. The pump housing 261 is block shaped. A control unit 29 is provided to control the pump unit 26. The control unit 29 is electrically connected to an electric motor 262 for driving an internally positioned piston pump 4. The electric motor 262 is connected to a front side of the pump housing 261. The piston pump 4 is arranged inside the pump housing. The pump housing houses the piston pump 4. Further, the pump unit 26 comprises a valve unit 28. The valve unit 28 is connected to a top side of the pump housing. Further, the pump unit 26 comprises a reservoir 263 for accumulating hydraulic liquid. The reservoir 263 is positioned at a back side of the pump housing 261.

According to the present invention, an improvement is provided regarding the piston pump 4. An embodiment of such a piston pump 4 is shown in fig. 3 and fig. 4. The improvement relates to a spatial placement of several components forming the piston pump 4. Further, the improvement according to the invention relates to control means to control a pump capacity of the rotary piston pumped 4. Fig. 3 shows in a schematic view a piston pump 4 which is arranged as a rotary piston pump 40. The rotary piston pump 40 has a rotor 46 and a stator 42. The rotor 46 has a rotor body 460 which is rotationally connected to a stator body 420 of the stator 42. The stator 42 has a longitudinal stator body 420 which extends in an axial direction. The stator body 420 is stationary connected to the pump housing 261. The stator body 420 includes at least two channels forming at least one inlet channel 43 and at least one outlet channel 44. Seen in a cross-section, the stator body 420 has a first portion and a second portion. The first portion comprises the at least one inlet channel 43 and the second portion comprises the at least one outlet channel 44. The inlet channel 43 is arranged to withdraw a hydraulic liquid from the reservoir 263. The outlet channel 44 is arranged to charge hydraulic liquid from the pump housing 261 via a hydraulic conduit to at least one of the cylinders of the hydraulic actuating system 21.

The piston pump 40 is of a type of a piston pump which includes pistons 41 which rotate together with the rotor body 460. As the pistons 41 are rotated during operation of the piston pump, the piston pump is a so-called rotary piston pump.

The rotor body 460 comprises several cylinder holes for receiving a piston 41. The piston 41 is movable in a radial direction with respect to the rotor body 460. The piston 41 has a

longitudinal piston body 410. The piston body 410 has a proximal piston end which is directed to the stator body 420 and a distal piston end which is directed radially outwards to a ring shaped element which surrounds the rotor body 460. The ring shaped element is a so-called eccentric ring 48. The rotor body 460 is positioned inside the eccentric ring 48. The eccentric ring 48 comprises an inner bearing surface. The inner bearing surface is positioned opposite an outer circumferential rotor surface 461. The inner bearing surface provides an inner running surface 481 to the distal ends of the pistons 41. Further, the eccentric ring 48 comprises an outer circumferential ring surface 482. The outer ring surface of the eccentric ring 48 has seen in a projection in an axial direction an outer ring contour 4821.

The eccentric ring 48 is eccentrically positioned with respect to the rotor body 460. Due to the eccentricity E, a height of an intermediate space in between an outer surface of the rotor body and the inner running surface 481 is varying which will cause the pistons 41 to move in a radial direction when rotationally driving the rotor body 460. Radially inward moving pistons 41 will provide a pressure to the hydraulic liquid and will push the hydraulic liquid through the outlet channel 44 and radially outward moving pistons 41 will provide an under pressure to the hydraulic liquid which will suck hydraulic liquid through the inlet channel 43. In dependency of a rotational driving direction A of the rotor body 460 and a positive or negative eccentricity E, the channels in the stator 42 may selectively serve as an inlet or outlet channel. Herewith, the radially moving pistons 41 generate a pumping working to the hydraulic circuit.

The eccentricity E in between the eccentric ring 48 and the rotor body 460 is adjustable. The eccentricity E is adjustable from a neutral position, in which the eccentricity E is zero to a positive and/or negative position in which the eccentricity E has a positive or negative value. As shown in Fig. 3, the eccentricity E is adjustable by a ring actuator 5. The ring actuator 5 is arranged to rotate the eccentric ring 48 about a pivot 50. The pivot 50 includes a pivot axis which extends in parallel with the axial direction defined by the rotor body. The pivot 50 is spaced from the centre of the eccentric ring 48 at a predetermined distance. Here, the pivot 50 is positioned at an outer circumference of the eccentric ring 48. The eccentric ring 48 is pivotally connected by the pivot 50 to the pump housing 261. The pivot 50 allows the eccentric ring 48 to swing relative to the stator 42.

The ring actuator 5 comprises an actuator 51 for rotating the eccentric ring 48 about the pivot 50. Here, the actuator 51 is an active actuator which means that the actuator 51 is a driven component, e.g. driven by an electric motor or by hydraulic activation. The actuator 51 is here embodied as an hydraulic cylinder. The actuator 51 engages to the eccentric ring 48. Here, the actuator 51 is in a abutting engagement with the eccentric ring 48. The actuator 51 is positioned and oriented at a distance from the pivot 50 to allow the eccentric ring 48 to rotate about the pivot 50. Here, the actuator 51 is oriented tangentially to an outer circumference of the eccentric ring 48 and positioned opposite the pivot 50.

Further, the ring actuator 5 comprises a biasing member 52 which is here embodied as a spiral spring. The biasing member 52 is positioned opposite the actuator 51 . The biasing member 52 provides a pre-tension to the eccentric ring 48 to maintain the eccentric ring 48 in contact with the actuator 50.

Fig. 4 shows in a perspective view an embodiment of the piston pump 4 according to invention. The piston pump 4 has a compact configuration. The piston pump 4 has a configuration as schematically shown in fig. 3.

The piston pump 4 is mounted inside a pump chamber 264 of a pump housing 261. The piston pump 4 is inserted from one side of the pump housing 261 as a subassembly into the pump chamber 264.

As described above, the piston pump 4 comprises a stator 42 which is centrally positioned inside the pump chamber 264. A rotor 46 is rotationally positioned onto the stator 42. The rotor 46 comprises a rotor body 460 which is co-axially positioned with respect to the stator 42. The piston pump 4 has an eccentric ring 48 which surrounds the rotor body 460. A ring-shaped intermediate space in between an outer circumferential surface 461 of the rotor body 460 and an inner running surface 481 is provided to allow pistons 41 holded by the rotor body 460 to move in a radial direction.

The piston pump 4 comprises a ring actuator 5 to adjust an eccentricity E of the eccentric ring 48 with respect to the rotor body 460. The eccentric ring 48 is movable with respect to the rotor body 460 to provide a predetermined eccentricity E. The eccentric ring 48 is pivotable about a pivot 50. The pivot 50 is formed by a shaft. The shaft provides a rotational connection in between the eccentric ring 48 and the pump housing 261. The pivot 50 is positioned at one side of the stator 42. The ring actuator 5 further comprises an actuator 51 which is provided to actuate the eccentric ring 48 and to set a predetermined eccentricity E. The actuator 51 is positioned with respect to the pivot 50 at an opposite side of the stator 42. The actuator 51 is positioned at an outer circumference of the eccentric ring 48. The eccentric ring 48 includes a lever 53. The lever 53 provides a connection in between the eccentric ring 48 and the actuator 51. The lever 53 is angularly spaced from the shaft 50 forming the pivot 50 over angle of 180°. The actuator 51 engages to the eccentric ring 48 by the lever 53. The lever 53 extends in an axial direction. The lever 53 extends in parallel with the rotor body 460. The lever 53 is connected to an end face 483 of the eccentric ring 48 which end face is opposite to an end face of the eccentric ring 48 which forms a motor end face 484. At the motor end face 484, the rotor body 460 comprises a link 49 for connecting a motor 262 for driving the rotor body.

The shown embodiment of fig. 4 has a very compact configuration which is provided - when seen in the axial direction - by the positioning of the actuator 51 behind the eccentric ring 48 of the piston pump 4. Instead of a positioning radially from the eccentric ring, the actuator 51 is positioned opposite the ring actuator end face 483 of the eccentric ring. The actuator 51 is mated with the ring end face 483 of the eccentric ring. The lever 53 is positioned at the ring end face 483 at a radial position within or adjacent to the outer ring contour 4821 which contributes to a relative small radial size of the piston pump 4.

Here, the actuator 51 is a single acting hydraulic cylinder. The hydraulic cylinder 51 is controllable by transferring hydraulic liquid to and fro the hydraulic cylinder 51. The hydraulic cylinder 51 is electronically connectable to the control unit 29 for controlling an eccentricity E of the piston pump 4. A biasing member 52 is positioned opposite the hydraulic cylinder to provide a pretension to the single acting hydraulic cylinder 51. The biasing member 52 is aligned with the actuator 51. Here, the biasing member 52 is positioned opposite the actuator 51. The lever 53 is positioned in between the actuator 51 and the biasing member 52. Both the biasing member 52 and actuator 51 are oriented tangentially to the outer circumference of the eccentric ring 48. The biasing member 52 counteracts the hydraulic cylinder 51 to return the cylinder 51 to an initial position.

In the shown embodiment of a pump unit 26, the eccentric ring 48 is seen in an axial direction positioned in between a motor 262 and a ring actuator 5. The motor 262 is positioned in front of the eccentric ring 48 and the ring actuator 5 is positioned behind the eccentric ring 48. Seen in the axial direction, the motor 262, the eccentric ring 48 and the ring actuator 5 are positioned in series. The ring actuator 5 engages the eccentric ring 48 at a position within an outer ring contour 4821. A point of engagement of the actuator 51 with the eccentric ring 48 is positioned at the end face 483 of the eccentric ring. This spatial arrangement provides a compact configuration of the pump unit 26. Advantageously, the pump unit 26 can be built in at narrow spaces, e.g. a small vehicle chassis mounting compartment. Herewith, the pump unit 26 is in particular suitable to be implemented in a hydraulic actuating system 21 for operating a convertible roof system 2. Thus, a pump unit is provided for pressurising an hydraulic actuating system for operating a vehicle part, like a sunroof, spoiler, boot lid, convertible roof etc. The pump unit has a compact configuration. The pump unit comprises a piston pump which has a rotor including pistons and an eccentric ring which is positioned around the rotor at an adjustable eccentricity. The eccentric ring is adjustable by a ring actuator. The ring actuator comprises an actuator which is in an axial direction positioned aside the eccentric ring. The actuator is positioned opposite and end face of the eccentric ring and seen in a radial direction engages the eccentric ring at a position within an outer ring contour. The positioning of the actuator contributes to the compact configuration of the pump unit which advantageously allows an installation of the pump unit at a narrow mounting space, like in a chassis compartment close to a movable vehicle part. Legend to the figures:

1 vehicle 482 outer circumferential ring surface

2 convertible roof system 4821 outer ring contour

20 convertible roof 483 actuator sided ring end face

5 21 hydraulic actuating system 484 motor sided ring end face

22 cover plate 49 link

23, 23' hydraulic cylinder E eccentricity

24, 24' hydraulic cylinder

25 hydraulic cylinder 5 ring actuator

10 26 pump unit 50 shaft / pivot

261 pump housing 51 actuator

262 electric motor 52 biasing member

263 reservoir 53 lever

264 pump chamber

15 28 valve unit

29 control unit 6 remaining roof part

7 front window frame

3 roof part 8 locking member

36 hydraulic cylinder

20

4 piston pump

40 rotary piston pump

41 piston

25 410 piston body

42 stator

420 stator body

43 inlet channel

44 outlet channel

30

46 rotor

460 rotor body

461 outer circumferential rotor surface

35 48 eccentric ring

481 running surface