Hydraulic motor

Abstract

An embodiment of the present disclosure provides a hydraulic motor, which includes a gear set, a balancing valve and two channels. Each channel includes an outer channel connecting the balancing valve to the outside of the hydraulic motor and an inner channel connecting the balancing valve to the gear set. The balancing valve has a first operating state and a second operating state. When hydraulic oil is not supplied to each channel, the balancing valve is placed in the first operating state, and when hydraulic oil is supplied to one channel, the hydraulic oil from one channel places the balancing valve in the second operating state. In the first operating state, the outer channel and the inner channel of each channel are disconnected by the balancing valve, and in the second operating state, the outer channel and the inner channel of the other channel are connected by the balancing valve. The hydraulic motor according to the embodiment of the present disclosure can, for example, improve the performance of the hydraulic motor.

Description

Technical Field

[0001] An embodiment of the present disclosure relates to a hydraulic motor. Background Art

[0002] A hydraulic motor such as a cycloidal hydraulic motor includes a housing, a gear set, an output shaft, and other components. The hydraulic motor is usually controlled by an external three-position four-way valve. In addition, when the hydraulic motor is used to drive a wheel, the output shaft of the hydraulic motor fits into a hole in the wheel hub. Summary of the invention

[0003] An object of an embodiment of the present disclosure is to provide a hydraulic motor such as a gerotor hydraulic motor, whereby, for example, the performance of the hydraulic motor can be improved.

[0004] According to an embodiment of the present disclosure, a hydraulic motor is provided, which includes: a gear set, which is used to convert hydraulic energy into mechanical energy; a balancing valve; and two channels, one of the two channels is used to supply hydraulic oil to the gear set, and the other of the two channels is used to discharge hydraulic oil from the gear set, each channel includes: an outer channel connecting the balancing valve to the outside of the hydraulic motor; and an inner channel connecting the balancing valve to the gear set, wherein the balancing valve has a first operating state and a second operating state, when each of the two channels does not supply hydraulic oil, the balancing valve is placed in the first operating state, and when one of the two channels supplies hydraulic oil, hydraulic oil from one of the two channels that supplies hydraulic oil places the balancing valve in the second operating state; wherein in the first operating state, the outer channel and the inner channel of each of the two channels are disconnected by the balancing valve; and wherein in the second operating state, the outer channel and the inner channel of the other of the two channels are connected by the balancing valve.

[0005] According to an embodiment of the present disclosure, the balancing valve includes: a valve body, a valve hole is formed in the valve body, and the valve hole has a closed first end and a second end; a balancing valve core, the balancing valve core is slidably arranged in the valve hole and has a first end and a second end, the first end and the second end of the balancing valve core are respectively facing the first end and the second end of the valve hole, and the balancing valve core can be switched between a first position in the middle of the valve hole and a second position deviated from the second end of the valve hole; a spring, the spring is arranged between the second end of the valve hole and the second end of the balancing valve core; an annular groove, the annular groove is formed on the outer periphery of the balancing valve core and is located between the first end and the second end of the balancing valve core; and an actuating channel, the actuating channel connects one of the two channels for supplying hydraulic oil with a first space between the first end of the valve hole and the first end of the balancing valve core, wherein when the balancing valve is in a first operating state, the spring moves the balancing valve core to the first position; and when the balancing valve is in a second operating state, the balancing valve core moves to the second position, so that the outer channel and the inner channel of the other channel of the two channels are connected through the annular groove.

[0006] According to an embodiment of the present disclosure, the hydraulic motor also includes: two bypass channels, one of the two bypass channels connects the outer channel and the inner channel of one of the two channels to each other, and the other of the two bypass channels connects the outer channel and the inner channel of the other of the two channels to each other; and two one-way valves, the two one-way valves are respectively arranged on the two bypass channels, and allow the hydraulic oil to flow from the outer channel to the inner channel and prevent the hydraulic oil from flowing from the inner channel to the outer channel, wherein in a second operating state, the one-way valve on the bypass channel connecting the outer channel and the inner channel of the one of the two channels to each other is opened, and the one-way valve on the bypass channel connecting the outer channel and the inner channel of the other of the two channels to each other is closed.

[0007] According to an embodiment of the present disclosure, in the second operation state, the outer channel and the inner channel of the one of the two channels supplying the hydraulic oil are disconnected by the balance valve.

[0008] According to an embodiment of the present disclosure, the balancing valve includes: a valve body, a valve hole formed in the valve body, the valve hole having a closed first end and a second end; a balancing valve core, the balancing valve core is slidably arranged in the valve hole and has a first end and a second end, the first end and the second end of the balancing valve core are respectively oriented towards the first end and the second end of the valve hole, and the balancing valve core switches between a first position in the middle of the valve hole and a second position deviated from one of the first end and the second end of the valve hole; two springs, the two springs are respectively arranged between the first end of the valve hole and the first end of the balancing valve core and between the second end of the valve hole and the second end of the balancing valve core; a first annular groove and a second annular groove, the first annular groove and the second annular groove are formed on the outer periphery of the balancing valve core and are located between the first end and the second end of the balancing valve core; and a first A valve core channel and a second valve core channel, the first valve core channel and the second valve core channel respectively connect the first annular groove and the second annular groove with the first space between the first end of the valve hole and the first end of the balancing valve core and the second space between the second end of the valve hole and the second end of the balancing valve core, wherein when the balancing valve is in the first operating state, the two springs move the balancing valve core to the first position; and when one of the two channels supplies hydraulic oil, hydraulic oil from the outer channel of one of the two channels that supplies hydraulic oil enters the first space through the first annular groove and the first valve core channel or enters the second space through the second annular groove and the second valve core channel, so that the balancing valve core moves to the second position, and the outer channel and the inner channel of the other channel of the two channels are connected through the second annular groove or the first annular groove.

[0009] According to an embodiment of the present disclosure, the valve hole extends in a first direction, and each of the outer channel and the inner channel of the two channels has a straight portion connected to the valve hole and extending in a direction perpendicular to the first direction.

[0010] According to an embodiment of the present disclosure, the straight-line portion of the outer channel of the two channels is disposed between the straight-line portions of the inner channel of the two channels.

[0011] According to an embodiment of the present disclosure, the two bypass passages are substantially parallel to the valve hole.

[0012] According to an embodiment of the present disclosure, one of the two bypass channels connects the straight line portion of the outer channel and the straight line portion of the inner channel of one of the two channels to each other, and the other of the two bypass channels connects the straight line portion of the outer channel and the straight line portion of the inner channel of the other of the two channels to each other.

[0013] According to an embodiment of the present disclosure, the hydraulic motor further includes: a balancing plate arranged between the valve body and the gear set; a distribution plate arranged on a side of the gear set away from the balancing plate; and a housing arranged on a side of the distribution plate away from the gear set, wherein each inner channel includes a channel formed in the valve body, the balancing plate, the stator of the gear set, the distribution plate and the housing, and a distribution channel formed in the distribution plate.

[0014] According to an embodiment of the present disclosure, the housing includes: an annular portion; and a cylindrical portion axially extending from the annular portion in a direction away from the distribution plate, and the hydraulic motor also includes: an output shaft, the output shaft axially extending from the cylindrical portion of the housing in a direction away from the annular portion; a hub portion mounted on the annular portion through a bearing; and a connecting cover, the connecting cover having an inner hole, the extending portion of the output shaft fits in the inner hole of the connecting cover, the connecting cover connects the output shaft to the hub portion, so that the hub portion, the connecting cover and the output shaft rotate together.

[0015] According to an embodiment of the present disclosure, the channel in the housing is formed in an annular portion of the housing.

[0016] The hydraulic motor according to the embodiment of the present disclosure can, for example, improve the performance of the hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional view of a hydraulic motor according to an embodiment of the present disclosure, showing the structure of a balancing valve;

[0018] Figure 2 is a schematic cross-sectional view of a hydraulic motor according to an embodiment of the present disclosure, taken along an axial direction; and

[0019] Figure 3 is a schematic hydraulic diagram of a hydraulic motor according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] The hydraulic motor according to the embodiment of the present disclosure is described below with reference to the accompanying drawings and embodiments.

[0021] See also Figures 1 to 3The hydraulic motor according to the embodiment of the present disclosure includes: a gear set 4, a balancing valve 1, and two channels. The gear set 4 is used to convert hydraulic energy into mechanical energy, and the gear set 4 includes an internal gear 42 as a rotor and an external gear 41 as a stator. One of the two channels is used to supply hydraulic oil to the gear set 4, and the other of the two channels is used to discharge hydraulic oil from the gear set 4, for example, through port A or port B. Each channel includes: an outer channel 21 connecting the balancing valve 1 to the outside of the hydraulic motor; and an inner channel 22 connecting the balancing valve 1 to the gear set 4. The balancing valve 1 has a first operating state and a second operating state. When hydraulic oil is not supplied to each of the two channels, the balancing valve 1 is placed in the first operating state, and when hydraulic oil is supplied to one of the two channels, the hydraulic oil from one of the two channels that supplies hydraulic oil places the balancing valve 1 in the second operating state. In the first operating state, the outer channel 21 and the inner channel 22 of each of the two channels are disconnected by the balancing valve 1, so the hydraulic motor is braked. In the second operating state, the outer channel 21 and the inner channel 22 of the other channel of the two channels are connected by the balancing valve 1 .

[0022] According to the embodiments of the present disclosure, see Figure 1 , the hydraulic motor may further include: two bypass channels 3 and two one-way valves 31. One of the two bypass channels 3 connects the outer channel 21 and the inner channel 22 of one of the two channels to each other, and the other of the two bypass channels 3 connects the outer channel 21 and the inner channel 22 of the other of the two channels to each other. The two one-way valves 31 are respectively arranged on the two bypass channels 3, and allow the hydraulic oil to flow from the outer channel 21 to the inner channel 22 and prevent the hydraulic oil from flowing from the inner channel 22 to the outer channel 21. In the second operating state, the hydraulic oil opens the one-way valve 31 on the bypass channel 3 connecting the outer channel 21 and the inner channel 22 of one of the two channels to each other, and closes the one-way valve 31 on the bypass channel 3 connecting the outer channel 21 and the inner channel 22 of the other of the two channels to each other. Thus, any one of the two ports A and B can be used as a high-pressure port. In addition, in the second operating state, the outer channel 21 and the inner channel 22 of one of the two channels supplying hydraulic oil can be disconnected by the balancing valve 1.

[0023] According to the embodiments of the present disclosure, see Figure 1The balancing valve 1 comprises: a valve body 10, a balancing valve core 12, two springs 13, a first annular groove 14 and a second annular groove 14, and a first valve core passage 15 and a second valve core passage 15. A valve hole 11 is formed in the valve body 10, and the valve hole 11 has a first end and a second end that are closed. The balancing valve core 12 is slidably disposed in the valve hole 11 and has a first end and a second end, and the first end and the second end of the balancing valve core 12 are respectively oriented toward the first end and the second end of the valve hole 11, and the balancing valve core 12 switches between a first position in the middle of the valve hole 11 and a second position deviated from one of the first end and the second end of the valve hole 11. The two springs 13 are respectively disposed between the first end of the valve hole 11 and the first end of the balancing valve core 12 and between the second end of the valve hole 11 and the second end of the balancing valve core 12. The first annular groove 14 and the second annular groove 14 are formed on the outer periphery of the balancing valve core 12 and are located between the first end and the second end of the balancing valve core 12. The first valve core channel 15 and the second valve core channel 15 respectively connect the first annular groove 14 and the second annular groove 14 with the first space between the first end of the valve hole 11 and the first end of the balancing valve core 12 and the second space between the second end of the valve hole 11 and the second end of the balancing valve core 12. In the case where hydraulic oil is not supplied in both channels, the two springs 13 place the balancing valve core 12 in the first position, and the balancing valve 1 is in the first operating state. In the case where hydraulic oil is supplied in one of the two channels, hydraulic oil from the outer channel 21 of the channel supplying hydraulic oil in the two channels enters the first space ( Figure 1 The space shown on the left in the figure) or enters the second space ( Figure 1 The space shown on the right side of the figure) moves the balancing valve core 12 to the second position, and the outer channel 21 and the inner channel 22 of the other channel of the two channels are connected through the second annular groove 14 or the first annular groove 14.

[0024] According to an embodiment of the present disclosure, Figure 1 When hydraulic oil is supplied from port A, hydraulic oil from the outer channel 21 located on the left side enters Figure 1 The first space on the left side of the balance valve core 12 moves to the right, and the outer channel 21 and the inner channel 22 of the left channel are disconnected, while the outer channel 21 and the inner channel 22 of the right channel are connected through the second annular groove 14. At this time, the one-way valve 31 on the left is opened, and the one-way valve 31 on the right is closed. When the hydraulic oil is supplied to the port B, the hydraulic oil in the outer channel 21 of the right channel enters Figure 1The second space on the right side of the balance valve core 12 moves to the left, the outer channel 21 and the inner channel 22 of the right channel are disconnected, and the outer channel 21 and the inner channel 22 of the left channel are connected through the second annular groove 14. At this time, the one-way valve 31 on the right is opened and the one-way valve 31 on the left is closed.

[0025] According to the embodiments of the present disclosure, see Figure 1 , the valve hole 11 extends along the first direction ( Figure 1 The outer channel 21 and the inner channel 22 of the two channels each have a straight portion connected to the valve hole 11 and extending in a direction perpendicular to the first direction ( Figure 1 The two bypass passages 3 are substantially parallel to the valve hole 11. One of the two bypass passages 3 connects the linear portion of the outer passage 21 of one of the two passages and the linear portion of the inner passage 22 to each other, and the other of the two bypass passages 3 connects the linear portion of the outer passage 21 of the other of the two passages and the linear portion of the inner passage 22 to each other.

[0026] According to the embodiments of the present disclosure, see Figure 2 The hydraulic motor further includes a balance plate 5 disposed between the valve body 10 and the gear set 4. When the high-pressure oil enters the cavity between the balance plate 5 and the valve body 10 through the cavity of the gear set 4, the pressure in the cavity rises continuously, the balance plate undergoes elastic deformation and clings to the stator of the gear set, and the axial clearance between the stator and the balance plate becomes smaller. The smaller clearance reduces the end face leakage of the motor and improves the volumetric efficiency of the motor, thereby enabling the motor to operate at a stable low speed.

[0027] The hydraulic motor further includes: a distribution plate 6 disposed on a side of the gear set 4 away from the balance plate 5; and a housing 9 disposed on a side of the distribution plate 6 away from the gear set 4. Each inner channel 22 includes a channel formed in the valve body 10, the balance plate 5, the stator 41 of the gear set 4, the distribution plate 6 and the housing 9, and a distribution channel formed in the distribution plate 6. The valve body 10, the balance plate 5, the stator 41 of the gear set 4, the distribution plate 6 and the housing 9 are fixed by bolts 81.

[0028] like Figure 2 As shown, two channels are formed in the balance plate 5, the stator 41 of the gear set 4, the distribution plate 6 and the housing 9. The two channels formed in the stator 41 of the gear set 4, the distribution plate 6 and the housing 9 are aligned with each other to form a flow channel g and a flow channel f. Port A and port B are provided in the valve body 10. When high pressure oil enters port A, Figure 1 The one-way valve 31 on the left side of the valve is opened, and the high-pressure oil enters the distribution channel of the distribution plate 6 through the flow channel g and the annular groove k. Figure 1 The outer channel 21, the first annular groove 14 and the first valve core channel 15 of the left channel enter Figure 1 The first space on the left side of the balance valve core 12 overcomes the spring force of the spring 13 and moves to the right to the second position. At this time, the outer channel 21 and the inner channel 22 on the right side are connected through the second annular groove 14, so that port B is connected with the flow channel f. After the high-pressure oil enters the gear set 4, the internal gear 42 rotates, and the internal gear 42 transmits the torque to the hub part 71 through the linkage shaft 73, the output shaft 70, and the connecting cover 72. At this time, the one-way valve 31 on the left is opened and the one-way valve 31 on the right is closed. When the high-pressure oil stops entering port A, the balance valve core 12 returns to the first position (middle position) under the action of the spring and the one-way valve 31 on the left is closed. The outer channel 21 and the inner channel 22 of the two channels are disconnected by the balance valve 1, and the motor stops to realize the braking function. When the vehicle equipped with this motor exceeds the speed limit (for example, when going downhill), the supply of high-pressure oil cannot keep up. Figure 1 The pressure of the hydraulic oil in the first space on the left side is reduced. At this time, the valve core 12 will return to the left under the action of the spring 13 on the right side, so that the flow area of ​​the second annular groove 14 on the right side is reduced, and the amount of hydraulic oil returning from the inner channel 22 on the right side through the second annular groove 14 to the outer channel 21 is also reduced, so that the vehicle speed is also reduced, which plays a balancing role.

[0029] According to the embodiments of the present disclosure, see Figure 2 The housing 9 includes: an annular portion 91; and a cylindrical portion 92 axially extending from the annular portion 91 in a direction away from the distributor plate 6. The hydraulic motor also includes: an output shaft 70, which extends axially from the cylindrical portion 92 of the housing 9 in a direction away from the annular portion 91; a hub portion 71 mounted on the annular portion 91 through a bearing; and a connecting cover 72, which has an inner hole, and the extending portion of the output shaft 70 is fitted in the inner hole of the connecting cover 72, and the connecting cover 72 connects the output shaft 70 with the hub portion 71, so that the hub portion 71, the connecting cover 72 and the output shaft 70 rotate together. The channel in the housing 9 is formed in the annular portion 91 of the housing 9. The extending portion of the output shaft 70 is fitted in the inner hole of the connecting cover 72 by splines. The linkage shaft 73 is connected to the internal gear 42 of the gear set 4 by splines, and is connected to the output shaft 70 by splines. The connecting cover 72 and the hub portion 71 are fixed by bolts 82. The end cover 74 is connected to the connecting cover 72 .

[0030] According to the embodiments of the present disclosure, see Figure 1 Although any one of the ports A and B in the above embodiment can be used as a high-pressure port, only one port can be used as a high-pressure port, thereby simplifying Figure 1The structure of the hydraulic motor shown in FIG. Specifically, the balancing valve 1 includes: a valve body 10, a balancing valve core 12, a spring 13, an annular groove 14, and a brake channel. A valve hole 11 is formed in the valve body 10, and the valve hole 11 has a first end and a second end that are closed. The balancing valve core 12 is slidably arranged in the valve hole 11 and has a first end and a second end. The first end and the second end of the balancing valve core 12 are respectively facing the first end and the second end of the valve hole 11. The balancing valve core 12 can switch between a first position in the middle of the valve hole 11 and a second position deviating from the second end of the valve hole 11. A limiting structure is provided in the valve hole 11, for example, a shoulder is provided on the hole wall of the valve hole 11, so that the balancing valve core 12 cannot deviate from the first position to the first end of the valve hole 11. The spring 13 is arranged between the second end of the valve hole 11 and the second end of the balancing valve core 12. The annular groove 14 is formed on the outer periphery of the balancing valve core 12 and is located between the first end and the second end of the balancing valve core 12. The brake passage connects one of the two passages for supplying hydraulic oil with the first space between the first end of the valve hole 11 and the first end of the balancing valve core 12. When the balancing valve 1 is in the first operating state, the spring 13 moves the balancing valve core 12 to the first position, and when the balancing valve 1 is in the second operating state, the hydraulic oil enters the first space between the first end of the valve hole 11 and the first end of the balancing valve core 12 from one passage via the brake passage, so that the balancing valve core 12 moves to the second position, so that the outer channel 21 and the inner channel 22 of the other of the two passages are connected through the annular groove 14.

[0031] The hydraulic motor according to the embodiment of the present disclosure can improve the performance under low flow and high pressure. For example, the low speed stability of the motor under low flow and high pressure is improved. In addition, the hub mounting method is adopted to reduce the axial length of the hydraulic motor, making the hydraulic motor compact and easy to install. In addition, the integrated balance valve and one-way valve are used to realize the braking function.

Claims

1. A hydraulic motor, characterized in that: The hydraulic motor comprises: a gear set for converting hydraulic energy into mechanical energy; Balancing valves; and two passages, one of the two passages for supplying hydraulic oil to the gear set and the other of the two passages for discharging hydraulic oil from the gear set, each passage comprising: an outer passage connecting the counterbalance valve with the outside of the hydraulic motor; and an inner passage connecting the counterbalance valve with the gear set, wherein the balancing valve has a first operating state and a second operating state, the balancing valve is placed in the first operating state when hydraulic oil is not supplied to each of the two passages, and when hydraulic oil is supplied to one of the two passages, hydraulic oil from the one of the two passages that supplies hydraulic oil places the balancing valve in the second operating state; wherein in a first operating state, the outer channel and the inner channel of each of the two channels are disconnected by the balancing valve; and In the second operating state, the outer channel and the inner channel of the other channel of the two channels are connected by the balancing valve.

2. The hydraulic motor according to claim 1, characterized in that: The balancing valve comprises: a valve body having a valve hole formed therein, the valve hole having a first closed end and a second closed end; a balancing valve core, the balancing valve core being slidably disposed in the valve hole and having a first end and a second end, the first end and the second end of the balancing valve core facing the first end and the second end of the valve hole respectively, the balancing valve core being switchable between a first position in the middle of the valve hole and a second position deviating from the second end of the valve hole; a spring disposed between the second end of the valve hole and a second end of the balancing valve core; an annular groove formed on an outer periphery of the balancing valve core and located between a first end and a second end of the balancing valve core; and an actuating passage connecting one of the two passages for supplying hydraulic oil to a first space between the first end of the valve hole and a first end of the balancing valve core, wherein when the balancing valve is in a first operating state, the spring moves the balancing valve core to a first position; and When the balance valve is in the second operation state, the balance valve core moves to the second position, so that the outer channel and the inner channel of the other channel of the two channels are connected through the annular groove.

3. The hydraulic motor according to claim 1, characterized in that: The hydraulic motor also includes: two bypass passages, one of the two bypass passages connecting the outer passage and the inner passage of one of the two passages to each other, and the other of the two bypass passages connecting the outer passage and the inner passage of the other of the two passages to each other; and two one-way valves, the two one-way valves are respectively arranged on the two bypass channels, and allow the hydraulic oil to flow from the outer channel to the inner channel and prevent the hydraulic oil from flowing from the inner channel to the outer channel, In the second operating state, the one-way valve on the bypass channel connecting the outer channel and the inner channel of one of the two channels is opened, and the one-way valve on the bypass channel connecting the outer channel and the inner channel of the other of the two channels is closed.

4. The hydraulic motor according to claim 3, characterized in that: In the second operation state, the outer channel and the inner channel of the one of the two channels supplied with hydraulic oil are disconnected by the balance valve.

5. The hydraulic motor according to claim 3, characterized in that: The balancing valve comprises: a valve body having a valve hole formed therein, the valve hole having a first closed end and a second closed end; a balancing valve core, the balancing valve core being slidably disposed in the valve hole and having a first end and a second end, the first end and the second end of the balancing valve core facing the first end and the second end of the valve hole respectively, the balancing valve core switching between a first position in the middle of the valve hole and a second position deviating from one of the first end and the second end of the valve hole; two springs, the two springs being respectively arranged between the first end of the valve hole and the first end of the balancing valve core and between the second end of the valve hole and the second end of the balancing valve core; a first annular groove and a second annular groove, the first annular groove and the second annular groove being formed on an outer circumference of the balancing valve core and being located between a first end portion and a second end portion of the balancing valve core; and a first valve core passage and a second valve core passage, wherein the first valve core passage and the second valve core passage respectively connect the first annular groove and the second annular groove to a first space between the first end of the valve hole and the first end of the balancing valve core and to a second space between the second end of the valve hole and the second end of the balancing valve core, wherein when the balancing valve is in a first operating state, the two springs move the balancing valve core to a first position; and When one of the two channels supplies hydraulic oil, hydraulic oil from the outer channel of one of the two channels that supplies hydraulic oil enters the first space through the first annular groove and the first valve core channel or enters the second space through the second annular groove and the second valve core channel, so that the balancing valve core moves to the second position, and the outer channel and the inner channel of the other channel of the two channels are connected through the second annular groove or the first annular groove.

6. The hydraulic motor according to claim 5, characterized in that: The valve hole extends in a first direction, and each of the outer channel and the inner channel of the two channels has a straight line portion connected to the valve hole and extending in a direction perpendicular to the first direction.

7. The hydraulic motor according to claim 6, characterized in that: The straight-line portion of the outer channel of the two channels is disposed between the straight-line portions of the inner channel of the two channels.

8. The hydraulic motor according to claim 7, characterized in that: The two bypass passages are substantially parallel to the valve hole.

9. The hydraulic motor according to claim 7, characterized in that: One of the two bypass channels connects the straight line portion of the outer channel and the straight line portion of the inner channel of one of the two channels, and the other of the two bypass channels connects the straight line portion of the outer channel and the straight line portion of the inner channel of the other of the two channels.

10. The hydraulic motor according to claim 2, characterized in that: The hydraulic motor also includes: A balance plate disposed between the valve body and the gear set; a distribution plate disposed on a side of the gear set away from the balancing plate; and A housing disposed on the side of the valve plate away from the gear set, Each inner channel includes channels formed in the valve body, the balance plate, the stator of the gear set, the distribution plate and the housing, and a distribution channel formed in the distribution plate.

11. The hydraulic motor according to claim 10, characterized in that: The housing comprises: an annular portion; and a cylindrical portion extending axially from the annular portion in a direction away from the distribution plate, The hydraulic motor also includes: an output shaft extending axially from the cylindrical portion of the housing in a direction away from the annular portion; A hub portion mounted on the annular portion via a bearing; and The connecting cover has an inner hole, and the protruding part of the output shaft fits in the inner hole of the connecting cover. The connecting cover connects the output shaft with the hub part, so that the hub part, the connecting cover and the output shaft rotate together.

12. The hydraulic motor according to claim 11, characterized in that: The passage in the housing is formed in an annular portion of the housing.

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