FIXED VANE TYPE HYDRAULIC MOTOR

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a fixed vane type hydraulic motor in which an output is obtained by compulsorily circulating a fluid, and more particularly, to a fixed vane type hydraulic motor in which a steady output can be obtained and rotation speed of an output shaft can be varied.

Description of the Related Art

Generally, a hydraulic motor is a device in which a high pressure that is generated by a hydraulic pump driven by a motor or an engine is applied to a driving shaft to generate a driving force.

In other words, there are commonly used hydraulic motors such as a slice vane type hydraulic motor and an axel piston type hydraulic motor. The slice vane type hydraulic motor has advantages such as a simple structure, light weight, and a small variation of torque. However, in the slice vane type hydraulic motor, since much fluid leaks from the inside thereof due to the movement of a slice vane, a great centrifugal force is generated due to a high rotation speed, the slice vane is closely contacted to an inner wall of a cam ring due to the

centrifugal force to increase a frictional force, the frictional force consumes the driving force and causes heat, noise, and vibration, the slice vane is worn rapidly and torque efficiency is inferior in the event of starting and driving at a low speed.

Moreover, in the axel piston type hydraulic motor, although a small quantity of a fluid leaks from the inside thereof, a torque stability is excellent at a low speed, and a range of a rotation speed is wide, its structure is complex and a flow of the fluid is obstructed in the event of driving the axel piston type hydraulic motor at a high speed so that noise and vibration are generated, malfunction occurs, efficiency becomes inferior, and it is expensive.

SUMMARY OF THE INVENTION

Therefore, the present invention has been made in view of the above problems, and it is an aspect of the present invention to provide a high efficiency fixed vane type hydraulic motor in which a load is not increased due to a centrifugal force even when the fixed vane type hydraulic motor is driven at a high speed such that the fixed vane type hydraulic motor can be smoothly driven from a stopped state to the high speed, wear of a driving unit is minimized to elongate a lifespan, heat, noise, and vibration are minimized,

and the lifespan can be maximized without limit of manufacturing material.

Moreover, it is another aspect of the present invention to provide a fixed vane type hydraulic motor in which a compulsorily restrained horizontal partition is applied with a fluid pressure to block a fluid that does not work and is discharged, a uniform driving force is generated to make the fixed vane type hydraulic motor output without stopping such that a stable driving force can be supplied to a load and a stable output can be obtained.

It is still another aspect of the present invention to provide a fixed vane type hydraulic motor in which an angle of an oblique rotation body is changed to easily vary a rotation speed of an output shaft while the fixed vane type hydraulic motor is driven to obtain an output, the rotation direction of the output shaft is easily changed, and the output shaft while rotating, is rapidly stopped.

In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a fixed vane type hydraulic motor comprising: a main body including an actuating space provided therein and having both opened sides; a horizontal rotation body rotatably mounted in the actuating space and including a fluid passing space, in which a spherical groove with an opened opposite end is formed and fluid chambers are formed around the spherical

groove and are partitioned by a plurality of rotating horizontal partitions, and an output shaft; a fluid passing device provided at both lateral plates of the respective fluid chambers and both lateral plates of the actuating space to make the fluid flow; a fluid compulsorily circulating device independently provided outside the main body to introduce and discharge the fluid through both sides of the respective fluid chambers via the fluid passing device such that the fluid is compulsorily circulated to the respective fluid chambers; and an oblique rotation body including a rotation plate which is rotatably mounted to the opened opposite side of the main body and in the spherical groove of the horizontal rotation body by a fixing device and protruding toward the respective fluid chambers, i.e., surroundings of the spherical groove such that, due to the flow of the fluid circulated under pressure by the fluid compulsorily circulating device and the fluid passing device, volume of both spaces of the respective fluid chambers is varied and the rotating horizontal plates in the respective fluid chambers rotate to obtain an output from the output shaft of the horizontal rotation body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view illustrating a hydraulic motor according to a first embodiment of the present invention;

FIG. 2 is a perspective view illustrating the hydraulic motor according to the first embodiment of the present invention;

FIG. 3 is a sectional view taken along the line A-A in FIG. 2;

FIGS. 4 and 5 are schematic exploded perspective views illustrating a rotation plate, a horizontal rotation body, and a main body for the purpose of illustrating an operation of the hydraulic motor according to the present invention, in which: FIG. 4 illustrates a state before a fluid enters; and

FIG. 5 illustrates introduction and discharge of the fluid;

FIG. 6 is a sectional view illustrating a hydraulic motor according to a second embodiment of the present invention;

FIG. 7 is a sectional view illustrating another angle changing unit of the hydraulic motor according to the second embodiment of the present invention;

FIG. 8 is a sectional view illustrating an overall configuration of a hydraulic motor according to a third embodiment of the present invention; and

FIG. 9 is a sectional view illustrating another example of a fixing device of the hydraulic motor according to the third embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view illustrating a hydraulic motor according to a first embodiment of the present invention, FIG. 2 is a perspective view illustrating the hydraulic motor according to the first embodiment of the present invention, and FIG. 3 is a sectional view taken along the line A-A in FIG. 2.

As illustrated, the hydraulic motor according to the first embodiment of the present invention includes a main body 1 in which an actuating space 11 with lateral opened sides is formed inside, a horizontal rotation body 2 rotatably mounted in the actuating space 11 and having a fluid passing space 23, in which a spherical groove 22 with an opened opposite side is formed and fluid chambers 231 are formed around the spherical groove 22 and are partitioned by a plurality of rotating horizontal partitions 233, and an output shaft 21, a fluid passing device 3 provided at both lateral plates of the respective fluid chambers 231 and both lateral plates of the actuating space 11 to flow the fluid, a fluid compulsorily circulating device 4 independently provided outside the main body 1 to introduce and discharge the fluid through both sides of the respective fluid chambers 231 via the fluid passing

device 3 such that the fluid is compulsorily circulated to the respective fluid chambers 231, and an oblique rotation body 5 having a rotation plate 53 which is rotatably mounted to the opened opposite side of the main body 1 and in the spherical groove 22 of the horizontal rotation body 2 by a fixing device β and protruding toward the respective fluid chambers 231, i.e., surroundings of the spherical groove 22 such that, due to the flow of the fluid circulated under pressure by the fluid compulsorily circulating device 4 and the fluid passing device 3, volume of both spaces of the respective fluid chambers 231 is varied and the rotating horizontal plates 233 in the respective fluid chambers 231 rotate to obtain an output from the output shaft 21 of the horizontal rotation body 2.

Particularly, the main body 1, as illustrated in FIG. 1, is configured such that a first main body that has the actuating space 11 having the opened opposite side and a horizontal hollow part, formed from the center of a side wall of the actuating space 11 to a side of the side wall, to which the output shaft 21 is mounted is assembled with a second main body to close an opposite space and having an opened central area through which the oblique rotation body 5 penetrates. Thus, the horizontal rotation body 2 and the oblique rotation body 5 can be easily assembled with each other within the main body 1 and maintenance is easily performed.

Moreover, the output shaft 21 of the horizontal rotation body 2 may protrude from the main body 1 to a side, or may be provided in the main body 1 to be connected by a connecting device such as a key, a spline, and a serration. The oblique rotation body 5 includes a spherical body 51 having an oblique rotation shaft 52 that is inserted into the spherical groove 22 and has an opposite side protruded to the outside of the horizontal rotation body, and the rotation plate 53 provided around the spherical body 51. The rotation plate 53 includes a plurality of partitions to vary arc widths of the respective fluid chambers 231.

Moreover, in grooves formed around the rotation body 53 into which the rotating horizontal plates 233 are inserted, rotation connecting shafts 532 including recesses 533 into which the rotating horizontal plates 233 are inserted are provided such that the sealing between the rotating horizontal plates 233 and the rotation plate 53 can be maintained.

The fluid passing device 3 includes at least one passing hole 31 formed in both lateral plates of the respective fluid chambers 231, and a plurality of long arc-shaped holes 32 formed around the both lateral plates of the actuating space to correspond to the arc widths of the respective fluid chambers 231 to selectively introduce and discharge the fluid. The fluid compulsorily circulating device 4 includes fluid introducing and discharging pipes 41 and 42, mounted in the long arc-shaped

holes 32, through which the fluid is introduced and discharged, and a fluid pump 42 provided between the introducing pipe 41 and the discharging pipe 43 to compulsorily circulate the fluid. A plurality of cooling fins 45 may be provided outside the introducing pipe 41 and the discharging pipe 43 to reduce a temperature of the fluid when the temperature of the fluid passing through the introducing pipe 41 and the discharging pipe 43 is increased. Moreover, a fluid tank 44 is further provided at the middle of the discharging pipe 43.

In other words, since the long arc-shaped holes 32 are formed around the both side walls of the actuating space 11 in the arc-shape, communication areas where the long arc-shaped holes 32 communicate with the passing holes 31 provided at the both sides of the respective fluid chambers 231 can be increased. Thus, the fluid can smoothly flow in the fluid chambers 231.

The respective passing holes 31 provided in the both side plates of the respective fluid chambers 231, as illustrated in FIG. 1, are plural, so that the fluid can be continuously introduced and discharged. Moreover, although the passing holes 31 are formed in the form of long arc-shaped hole, as described above, the fluid can be continuously introduced and discharged.

Moreover, the fixing device 6 includes oblique holes 61 provided at an opened side of the main body and sliding devices 62 provided in the oblique holes 61 to allow the oblique rotation shaft 52 of the spherical body 51 to rotate, so that the oblique rotation shaft 52 can be obliquely supported by the oblique holes 61 and the sliding devices 62.

On the other hand, a synthetic resin coating layer (not shown) may be further provided at an inner side of the fluid passing space 23, that is, an inner side of the oblique rotation body 5 to prevent wear. The inner sides of the both lateral plates of the fluid passing space 23 are formed by cone-shaped slopes 232 having inwardly-protruding central surroundings .

Hereinafter, operation of the hydraulic motor according to the first embodiment of the present invention will be described.

FIGS. 4 and 5 are schematic exploded perspective views illustrating a rotation plate, a horizontal rotation body, and a main body for the purpose of illustrating an operation of the hydraulic motor according to the present invention, in which: FIG. 4 illustrates a state before a fluid enters, and FIG. 5 illustrates introduction and discharge of the fluid. The operation will be described in the order of the above drawings.

Firstly, FIG. 4 illustrates a state before a fluid enters, as illustrated in FIGS. 1 to 3 and 4, the oblique

rotation body 5 does not rotate and the fluid is never introduced into the respective fluid chambers 231 of the fluid passing space 23.

Next, FIG. 5 shows the introduction and the discharge of the fluid by which the pump of the fluid compulsorily circulating device 4 is driven. As illustrated in FIGS. 1 to 3 and 5, when a pump 42 provided in the fluid compulsorily circulating device 4 is driven to compulsorily supply the fluid through the introducing pipe 41, the fluid with a pressure passes through the long arc-shaped holes 32, formed in the both side walls of the actuating space 11 of the main body 1 and connected to the introducing pipe 41. The fluid passing through the long arc-shaped holes 32 passes through the passing holes 31 that are formed in the lateral sides of the respective fluid chambers 231 and enters both sides of the respective fluid chambers 231 of the fluid introducing spaces 23.

Then, the fluid introduced into the both sides of the respective fluid chambers 231 pushes the rotating horizontal partitions 233 of the respective fluid chambers 231 in one direction at the same time so that the respective rotating horizontal partitions 233 rotate.

To push the respective rotating horizontal partitions 233 in one direction as described above, the rotation plate 52 of the oblique rotation body 5 rotates to the oblique positions within the respective fluid chambers 231 so that volumes of the

both sides of the respective fluid chambers 231 vary and the flowing fluid passes through the passing holes 31 provided in the both sides of the fluid chambers 231 and the long arc- shaped holes 32 provided at the both sides of the actuating space 11 and connected to the discharging pipe 43 and is discharged through the discharging pipe 43.

Moreover, the fluid discharged through the discharging pipe 43 is continuously introduced through the introducing pipe 41 again and is circulated by the continuous driving of the pump 42. Thus, the pump 42 of the fluid compulsorily circulating device 4 is driven to compulsorily circulate the fluid so that an output can be obtained from the output shaft 21.

Thus, as described above, the fluid which is introduced in the fluid introducing space 23 when the fluid is circulated through the fluid passing space 23 of the horizontal rotation body 2 enters the both sides of the respective fluid chambers 231, and the respective rotating horizontal partitions 233 of the respective fluid chambers 231 move in one direction due to the flow of the fluid at the same time. Then, the horizontal rotation body 2 to which the respective rotating horizontal partitions 233 are fixed rotates together so that a rotational output can be obtained from the output shaft 21 of the horizontal rotation body 2. Thus, the fluid compulsorily circulated by the pump 42 pushes the respective rotating

horizontal partitions 233 of the respective fluid chambers 231 in one direction at the same time to obtain the output, so that a phenomenon that a load is generated during the driving of the hydraulic motor can be prevented and a stable output can be also obtained. Moreover, since the load is prevented in advance, the respective rotating horizontal partitions 233 rotate simultaneously to distribute an output load during the driving so that the respective rotating horizontal partitions 233 can be also prevented from being damaged in advance. Although the operation has been described by taking the opposite space of one fluid chamber 231 as an example, when the above-described operation is performed in the opposite spaces of the respective fluid chambers 231 to move the rotating horizontal partitions 233, one-side spaces, operation reverse to the operation in the opposite space is performed so that the fluid moves the rotating horizontal partitions 233 in the same direction.

Thus, operations reverse to each other are performed in the both spaces of the respective fluid chambers 231 and the introducing pipe 41 and the discharging pipe 43 are branched into the actuating space 11 of the main body 1 so that the fluid can be smoothly circulated.

In addition, even when the hydraulic motor is rotated at a high speed such that the hydraulic motor is driven from a stopped state to the high speed without damage, the load is not

increased due to the centrifugal force. Wear of operating units is minimized to elongate a lifespan of the hydraulic motor, as well as heat, noise, and vibration can be minimized. Moreover, the lifespan can be maximized without limit of manufacturing material .

On the other hand, when compulsorily restrained horizontal partitions receive a pressure of the fluid to block the fluid being discharged without working and a uniform driving force is generated to allow the hydraulic motor to make an output without stopping, a stable driving force can be supplied to a load.

FIG. 6 is a sectional view illustrating a hydraulic motor according to a second embodiment of the present invention.

The hydraulic motor according to the second embodiment of the present invention is identical to the configuration of the hydraulic motor according to the first embodiment of the present invention except for the fixing device 6. The fixing device β includes an angle changing unit 63 that is provided in an opened one-side of the main body to vary a position of an opposite end of the oblique rotation body 5 such that the rotation speed of the output shaft 21 varies and an angle of the oblique rotation body 5.

The rotation plate 53 includes a plurality of partitions 531 provided in the respective fluid chambers to vary the arc widths.

Particularly, the angle changing unit 63 includes a support 631 to rotatably support an opposite end of the oblique rotation body 5, and an elevation device 632 provided in the opened opposite side of the main body 1 to elevate and lower the support 631 manually or using a driving device to vary an oblique angle of the oblique rotation body. Thus, when the oblique rotation body 5 is inclined by which the angle of the oblique rotation body 5 is changed by the elevation and lowering performed by the elevation device 62, the output shaft 21 of the hydraulic motor is rotated due to the circulated fluid. When the oblique rotation body 5 is horizontal, the output shaft 21 of the hydraulic motor stops.

The support 631 includes a bearing bracket 631a to support the opposite end of the oblique rotation body 5 to rotate and which has a spherical outer circumference. The elevation device 632 includes an elevation bracket 632a to surround the spherical circumference of the bearing bracket 632a and which has a tap hole 632b formed in the upper side thereof, a fixing housing 632c to completely surround the opposite end of the oblique rotation body 5 and which has a through-hole formed in a vertical position corresponding to the elevation bracket 632a, an elevation thread shaft 632d rotatably inserted into the through-hole and which has a lower end rotatably coupled in the tap hole of the elevation bracket 632a, and a handle 632e manipulated manually or by a motor 632f

driven by electric power that is provided from the outside, that is, the upper side of the elevation thread shaft 632d.

Hereinafter, operation of the hydraulic motor according to the second embodiment of the present invention will be described as follows.

As illustrated in FIGS. 6 and I ₁ the hydraulic motor is operated such that, firstly when the pump 42 of the fluid compulsorily circulating device 4 is driven to make the fluid circulate through the fluid passing space 23 formed in the horizontal rotation body 2, as illustrated in the first embodiment of the present invention, the horizontal rotation body 2 rotates due to the compulsory circulation of the fluid, and as a result a rotational output can be obtained from the output shaft 21. The hydraulic motor to perform the above-described operation has a feature that the angle of the oblique rotation body 5 rotated in association with the horizontal rotation body 2 is varied to enable the variation of the rotation speed of the output shaft 21. In other words, the rotation speed of the output shaft 21 of the hydraulic motor according to the present invention is easily adjusted by varying the angle of the oblique rotation body 5 with the angle changing unit 63 that includes the support 631 to rotatably support the opposite end of the oblique rotation body 5 and the elevation device 632 provided

in the opposite side of the main body 1 to elevate and lower the support 61 with a manual device to vary the oblique angle of the oblique rotation body.

In other words, the angle of the oblique rotation body 5 is changed to adjust the oblique angle of the rotation plate 53 provided in the oblique rotation body 5, so as to change volume of the both sides of the respective fluid chambers 231. Thus, it is possible to provide a flow rate adjusting hydraulic motor to easily adjust the rotation speed of the output shaft 21 during the driving and the stopped state of the hydraulic motor by which the flow rate of the fluid introduced into the fluid chambers 231 with a predetermined pressure is changed due to the volume change of the fluid chambers 231.

Moreover, as illustrated in FIG. 6, when the angle of the oblique rotation body 5 is changed into a reverse directional angle by the operation of the angle changing unit 63 during the above-mentioned pumping operation, the direction of the fluid compulsorily introduced through the introducing pipe can be reversed. In other words, when the opposite end of the oblique rotation body 5 is elevated higher than the horizontal state to change the angle of the oblique rotation body 5 into the reverse angle, the angle of the rotation plate 53, which is associated with the oblique rotation body 5 to change its angle, is converted into the reverse angle, so that the fluid

can flow reversely. Since the reversely pumping operation is identical to the above-mentioned pumping operation, its description will be omitted.

Thus, as described above, since the flow direction of the fluid is switched to the reverse direction, when the angle of the rotation body 53 is changed into the reverse direction by which the angle changing unit 63 of the fixing device 6 is manipulated to elevate the oblique rotation body 5 during the one-directional rotation of the output shaft 21, the rotation direction of the oblique rotation body 5 is changed into the opposite direction so that a hydraulic motor having an output shaft reversely rotating can be provided.

On the other hand, as illustrated in FIGS. 6 and 7, when the angle of the oblique rotation body 5 is changed to the horizontal state by driving the angle changing unit 6 during the forward and reverse directional pumping, the output shaft 21 of the hydraulic motor can be switched to the stopped state.

In other words, when the oblique rotation body 5 is maintained in the horizontal state, the rotation plate 53 rotated by being associated with the oblique rotation body 5 is maintained in the vertical state so that volumes of the both sides of the respective fluid chambers 231 are identical to each other. Thus, the hydraulic motor maintains an unloaded state and the output shaft 21 stops the rotation.

Thus, since the rotation of the output shaft 21 of the hydraulic motor can be stopped only when the angle of the oblique rotation body 5 is changed into the horizontal state without turning the electric power off, the output shaft 21 can be stopped during the operation of the hydraulic motor. As a result, it is possible to provide a hydraulic motor which can easily stop and re-start the output shaft 21 during the operation.

On the other hand, as illustrated in FIG. 6, the angle changing unit of the present invention, as illustrated above, includes the support 631 to rotatably support the opposite end of the oblique rotation body 5, and the elevation device 632 provided in the opened opposite side of the main body 1 to elevate and lower the support 631 manually or by using a driving device to vary the oblique angle of the oblique rotation body.

In other words, the support 631 includes the bearing bracket 631a to rotatably support the opposite end of the oblique rotation body 5 to rotate and which has the spherical outer circumference.

The elevation device 62 to elevate and lower the support 61 includes the elevation bracket 632a to surround the spherical circumference of the bearing bracket 632a and which has the tap hole 632b formed in the upper side thereof, the fixing housing 632c to completely surround the opposite end of

the oblique rotation body 5 and which has the through-hole formed in a vertical position corresponding to the elevation bracket 632a, the elevation thread shaft 632d rotatably inserted into the through-hole and which has the lower end rotatably coupled in the tap hole of the elevation bracket 632a, and the handle 632e manipulated manually or by the motor 632f driven by electric power that is provided from the outside, that is, the upper side of the elevation thread shaft 632d. Thus, the angle of the oblique rotation body 5 is changed by rotating the handle 632e or the motor 632f of the angle changing unit 63 constructed as described above so that the rotation speed of the output shaft 21 of the hydraulic motor can be easily adjusted. In more detail, when a user rotates or manipulates the handle or the motor of the elevation device 632, the elevation thread shaft 632d connected to the handle 632e or the motor 632f is rotated and the elevation position of the elevation bracket 632a connected to the elevation thread shaft 632d varies.

In other words, when the elevation thread shaft 632d rotates forward or reversely, the elevation position of the elevation bracket 632a is changed due to the rotation of the elevation thread shaft 632d. Since an inner surface of the elevation bracket 632a closely contacts an outer surface of the

support 631 during the change of the position of the elevation bracket 632a, when the position of the elevation bracket 632a is changed, the angle of the support 631 is also changed. Since the angle of the support 631 is changed, the angle of the oblique rotation body 5 whose the opposite end is fixed to the support is changed.

Thus, as described above, when the angle of the oblique rotation body 5 is varied, the angles of the spherical body 51 and the rotation plate 53 integrally fixed to the outer circumference of the spherical body 51 are varied so that a degree of the volume variation of the both sides of the respective fluid chambers can be adjusted. Therefore, the angle of the rotation plate 53 is easily changed so that the rotation speed of the output shaft can be easily adjusted during the operation of the hydraulic motor and in the stopped state, and as described above, the output shaft 21 can be rapidly stopped during the switching of the rotation direction of the output shaft 21 and during the rotation of the output shaft 21.

On the other hand, FIG. 7 is a sectional view illustrating another angle changing unit of the hydraulic motor according to the second embodiment of the present invention. The angle changing unit 63 of the hydraulic motor according to the second embodiment of the present invention includes a support 631 to rotatably support an opposite end of the oblique rotation body 5, and an elevation device 632 provided in the

opened opposite side of the main body 1 to elevate and lower the support 631 manually or using a driving device to vary an oblique angle of the oblique rotation body.

In other words, the support 631 includes the bearing bracket 631a to rotatably support the opposite end of the oblique rotation body 5 to rotate and which has the spherical outer circumference.

The elevation device 632 to elevate and lower the support 631 includes an elevation bracket 632a to surround the spherical circumference of the bearing bracket 632a, a fixing housing 632c to completely surround the opposite end of the oblique rotation body 5 and which has the through-hole 632h formed in a vertical position corresponding to the elevation bracket 632a, an elevation shaft 632j penetrating the through- hole 632h and which has the lower end fixed to the upper side of the elevation bracket 632a, and an actuator 632k provided at the outside, that is, the upper side of the elevation shaft 632j and driven by a fluid or an electric power to elevate and lower the elevation shaft. Thus, it is possible to provide a hydraulic motor in which the rotation speed of the output shaft 21 of the hydraulic motor can be adjusted during the operation and in the stopped state by which the actuator 632k of the angle changing unit 6 is driven to change the angle of the oblique rotation body 5, the rotation direction of the output shaft 21 can be

easily changed by switching the flow direction of the fluid, and the output shaft 21 can be easily stopped during the rotation of the output shaft 21.

FIG. 8 is a sectional view illustrating an overall configuration of a hydraulic motor according to a third embodiment of the present invention. The hydraulic motor according to the third embodiment of the present invention is identical to the configuration of the hydraulic motor according to the second embodiment of the present invention except for the oblique rotation body 5 and the angle changing unit 6 of the second embodiment of the present invention. The oblique rotation body 5 includes a spherical body 54 rotatably inserted into the spherical groove 22 and having a horizontal through- hole 541 formed therein and a rotation plate 53 provided at the circumference, and a shaft 55 penetrating the horizontal through-hole 541 via a bush 451 to move laterally without rotation and protruding outward of the horizontal rotation body 2.

The rotation plate 53 includes a plurality of partitions 531 provided in the respective fluid chambers to vary the arc widths. The fixing unit 6 configured to vary a position of the opposite end of the oblique rotation body 5 includes a through- hole 64 formed in a shaft 55 of the oblique rotation body 5, and an elevation device 66 provided in the opened opposite side of the main body 1 and connected to the through-hole 64 by a

hinge shaft 65 to be elevated and lowered manually or by a driving device to vary an oblique angle of the oblique rotation body. Thus, when the oblique rotation body 5 is inclined by which the angle of the oblique rotation body 5 is changed by the elevation and lowering performed by the elevation device 62, the output shaft 21 of the hydraulic motor is rotated due to the circulated fluid. When the oblique rotation body 5 is horizontal, the output shaft 21 of the hydraulic motor stops.

In addition, the elevation device 66 includes an elevation bracket 661 having a lower end connected to the through-hole 64 by the hinge shaft 65 and a tap hole 662 formed in the upper side thereof, a fixing housing 663 to completely surround the opposite end of the oblique rotation body 5 and which has a through-hole formed in a vertical position corresponding to the elevation bracket 661, an elevation thread shaft 664 rotatably inserted into the through-hole and which has a lower end rotatably coupled in the tap hole 662 of the elevation bracket 661, and a handle 665 manipulated manually or by a motor 666 driven by electric power that is provided from the outside, that is, the upper side of the elevation thread shaft 664.

Thus, the angle of the oblique rotation body 5 is changed by rotating the handle 665 or the motor 666 of the angle changing unit 6 constructed as described above so that the

rotation speed of the output shaft 21 of the hydraulic motor can be easily adjusted.

In more detail, when a user rotates or manipulates the handle 665 or the motor 666 of the elevation device 6, the elevation thread shaft 664 connected to the handle 665 or the motor 666 is rotated and the elevation position of the elevation bracket 661 connected to the elevation thread shaft 664 varies.

In other words, when the elevation thread shaft 664 rotates forward or reversely, the elevation position of the elevation bracket 661 is changed due to the rotation of the elevation thread shaft 664. Since the lower side of the elevation bracket 661 is connected to the shaft 55 of the oblique rotation body 5 by the hinge shaft 65, the angle of the oblique rotation body 5 is changed during the positional variation of the elevation bracket 661. Since the shaft 55 moves to the right side or to the left side with respect to a bearing 551 provided in the spherical body 54 during the angular change of the oblique rotation body 5, the angle of the oblique rotation body 5 having the shaft 55 is changed.

Thus, when the angle of the oblique rotation body 5 is changed, the angles of the spherical body 54 and the rotation plate 53 integrally fixed to the circumference of the spherical body 54 are varied so that a degree of the volume variation of the both sides of the respective fluid chambers can be

adjusted. Therefore, it is possible to provide a hydraulic motor in which the angle of the rotation plate 53 is easily changed so that the rotation speed of the output shaft 21 can be easily adjusted during the operation of the hydraulic motor and in the stopped state, and as described above, the rotation direction of the output shaft 21 can be changed by switching the flow direction of the fluid, and the output shaft 21 can be rapidly stopped during the rotation of the output shaft 21.

On the other hand, FIG. 9 is a sectional view illustrating another example of a fixing device of the hydraulic motor according to the third embodiment of the present invention. A fixing device 6 of the hydraulic motor according to the third embodiment of the present invention as another example includes a through-hole 64 formed in a shaft 55 of the oblique rotation body 5, and an elevation device 66 provided in the opposite side of the main body 1 and connected to the through-hole 64 by a hinge shaft 65 to be elevated and lowered manually or by a driving device to vary an oblique angle of the oblique rotation body. The elevation device 66 includes an elevation bracket 667 having a lower end connected to the through-hole 64 by the hinge shaft 65, a fixing housing 669 to completely surround the opposite end of the oblique rotation body 5 and which has a through-hole 668 formed in a vertical position corresponding to the elevation bracket 667, an elevation shaft 670 penetrating

the through-hole 668 and fixed to the upper side of the elevation bracket 667, and an actuator 671 provided at the outside, that is, the upper side of the elevation shaft 670 driven by a fluid or electric power to elevate and lower the elevation shaft 670.

Thus, it is possible to provide a hydraulic motor in which the angle of the oblique rotation body 5 is changed by driving the actuator 671 of the elevation device 66 of the fixing device 6 so that the pumped flow rate can be adjusted during the operation and in the stopped state, and as described above, the switching of the flow direction of the fluid and a stopped state of the pumping are enabled.

As described above, according to the features of the present invention, it is possible to provide a high efficiency fixed vane type hydraulic motor in which a load is not increased due to a centrifugal force even when the fixed vane type hydraulic motor is driven at a high speed such that the fixed vane type hydraulic motor can be smoothly driven from a stopped state to the high speed, wear of a driving unit is minimized to elongate a lifespan, heat, noise, and vibration are minimized, and the lifespan can be maximized without limit of manufacturing material.

Moreover, since a compulsorily restrained horizontal partition is applied with a fluid pressure to block a fluid that does not work and is discharged, efficiency is improved

and a stable output at a high torque can be obtained in a state where the fluid rarely leaks even at a high speed and a low speed.

It is possible to provide a fixed vane type hydraulic motor in which an angle of an oblique rotation body is changed to easily vary a rotation speed of an output shaft while the fixed vane type hydraulic motor is driven to obtain an output, the rotation direction of the output shaft is easily changed, and the output shaft while rotating, is rapidly stopped.