Hydraulic driving motor

Abstract

The hydraulic drive motor comprises a guide rail, a front end cover rotor, a rear end cover rotor, a stator, an oil distribution disc assembly, an oil distribution shaft and a plunger, the inner surface of the guide rail is a curved surface, the front end cover rotor and the rear end cover rotor are fixedly connected to the two end faces of the guide rail respectively, and the oil distribution shaft, the stator and the guide rail are sequentially connected from inside to outside in a sleeved mode. The stator is fixedly connected with the oil distribution disc assembly, the oil distribution shaft is fixedly connected with the rear end cover rotor, the outer surface of the stator is provided with a plurality of plunger grooves in the circumferential direction, each plunger groove is internally provided with a plunger, the oil distribution shaft is provided with an oil distribution shaft oil inlet channel and an oil distribution shaft oil outlet channel, and hydraulic oil flows through the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel along with rotation of the oil distribution shaft and the guide rail. The plunger grooves are alternately communicated with the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel. The guide rail of the motor is driven by hydraulic oil, torque is adjustable, rotating speed is flexibly adjusted, large driving torque can be achieved, operation is flexible, and automatic control, energy conservation and emission reduction are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, in particular to a hydraulic drive motor. Background Art

[0002] Motors are widely used as driving power for vehicles, etc. For engineering and technical fields such as wind power installation and mining, the construction site is generally located in mountainous areas where road and traffic conditions are very bad. The equipment required at the construction site is often relatively large, such as wind turbine blades. This puts higher requirements on transportation engineering vehicles, requiring engineering vehicles to operate more stably, efficiently and safely. In the prior art, the motors of engineering transportation vehicles still have many defects, such as insufficient power of the drive motor, inflexible speed adjustment, and the motor is supported on the drive axle shaft. Due to the rugged mountain roads and the operation of the drive axle shaft, the drive motor cannot be stably supported, affecting its safety and unstable motor operation. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a hydraulic drive motor, which can realize forward and reverse driving of the guide rail of the motor by changing the flow direction of the hydraulic oil, thereby realizing forward and backward driving of the rotating body fixedly connected to the guide rail, and the motor torque can be adjusted by adjusting the pressure of the hydraulic oil. The speed can be adjusted flexibly, a larger driving torque can be achieved, and the operation is flexible and maneuverable. It is driven by hydraulic oil, which is convenient for automation and intelligent setting with other controls. It is driven by hydraulic oil, which is beneficial to energy conservation and emission reduction.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A hydraulic drive motor comprises a guide rail, a front end cover rotor, a rear end cover rotor, a stator, an oil distribution plate assembly, an oil distribution shaft and a plunger. The guide rail is a cylindrical structure with a curved inner surface. The front end cover rotor and the rear end cover rotor are respectively fixedly connected to the two end surfaces of the guide rail. The oil distribution shaft, the stator and the guide rail are sequentially sleeved from the inside to the outside. One end of the stator is connected to the rear end cover rotor through a second bearing, the middle part of the stator is connected to the front end cover rotor through a bearing, and the other end of the stator is fixedly connected to the oil distribution plate assembly after passing through the front end cover rotor. One end of the oil distribution shaft is connected to the oil distribution plate assembly through a first bearing, and the other end is fixedly connected to the rear end cover rotor. A plurality of plunger grooves are provided on the outer surface of the stator along the circumferential direction, and a plunger is provided in each plunger groove. An oil distribution shaft oil inlet channel and an oil distribution shaft oil outlet channel for hydraulic oil to flow through are provided on the oil distribution shaft. As the oil distribution shaft and the guide rail rotate, the plunger grooves alternately connect the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel.

[0006] As a further improvement of the above technical solution:

[0007] Preferably, the stator is provided with a stator oil inlet channel and a stator oil outlet channel, one end of the stator oil inlet channel is connected to the oil distribution shaft oil inlet channel, and the other end is connected to the external oil inlet pipe, and one end of the stator oil outlet channel is connected to the oil distribution shaft oil outlet channel, and the other end is connected to the external oil return pipe.

[0008] Preferably, the oil distribution shaft is further provided with an oil inlet groove and an oil outlet groove, the oil inlet groove being an annular groove opened on the outer surface of the oil distribution shaft along the circumference of the oil distribution shaft, the stator oil inlet channel, the oil inlet groove and the oil distribution shaft oil inlet channel are connected in sequence, and one end of the oil distribution shaft oil inlet channel away from the oil inlet groove is alternately connected with each plunger groove as the oil distribution shaft rotates, the oil outlet groove is an annular groove opened on the outer surface of the oil distribution shaft along the circumference of the oil distribution shaft, the stator oil outlet channel, the oil outlet groove and the oil distribution shaft oil outlet channel are connected in sequence, and one end of the oil distribution shaft oil outlet channel away from the oil outlet groove is alternately connected with each plunger groove as the oil distribution shaft rotates, the plunger grooves are not connected with the oil inlet channel of the oil distribution shaft and the oil outlet channel of the oil distribution shaft at the same time, the oil inlet channel of the oil distribution shaft and the oil outlet channel of the oil distribution shaft are each provided with at least one, and the outer surface of the oil distribution shaft fits the inner surface of the stator.

[0009] Preferably, the stator is also provided with a plunger groove oil inlet channel and a plunger groove oil return channel, one end of the plunger groove oil inlet channel is connected to the plunger groove, and the port at the other end is on the inner surface of the stator, one end of the plunger groove oil return channel is connected to the plunger groove, and the port at the other end is on the inner surface of the stator, as the oil distribution shaft rotates, the port of the plunger groove oil inlet channel on the inner surface of the stator alternately connects to the oil distribution shaft oil inlet channel and is closed by the outer surface of the oil distribution shaft, and the port of the plunger groove oil return channel on the inner surface of the stator alternately connects to the oil distribution shaft oil outlet channel and is closed by the outer surface of the oil distribution shaft.

[0010] Preferably, the external oil inlet pipe passes through the oil distribution plate assembly and then is connected to the stator oil inlet passage, and the external oil return pipe passes through the oil distribution plate assembly and then is connected to the stator oil outlet passage.

[0011] Preferably, the stator is further provided with a stator oil drain channel, one end of the stator oil drain channel is connected to the inner surface of the stator, and the other end of the stator oil drain channel is connected to an external oil drain pipe.

[0012] Preferably, in a plane perpendicular to the axial direction of the guide rail, the inner surface of the guide rail is wavy, and the wavy shape is formed by connecting a plurality of wavy units end to end in sequence, and the wavy unit includes a symmetrically arranged downward section and upward section.

[0013] Preferably, when the plunger groove and the oil inlet channel of the oil distribution shaft are connected, the plunger position in the plunger groove corresponds to the downward section of one of the wave units on the inner surface; when the plunger groove and the oil outlet channel of the oil distribution shaft are connected, the plunger position in the plunger groove corresponds to the upward section of one of the wave units on the inner surface.

[0014] The beneficial effects of the utility model are as follows: by changing the flow direction of the hydraulic oil, the guide rail of the motor can be driven forward and reversely, thereby realizing the forward and backward driving of the rotating body fixedly connected to the guide rail; by adjusting the pressure of the hydraulic oil, the motor torque can be adjusted; the speed can be adjusted flexibly, a larger driving torque can be achieved, and the operation is flexible and maneuverable; by being driven by hydraulic oil, it is convenient to automate and intelligently set it with other controls, which is beneficial to energy conservation and emission reduction; the shell rotates, and the wheel can be driven by connecting the shell and the vehicle hub and supported on the hub; the two move synchronously, and the operation is smoother and more stable; the oil channels in the motor correspond one to one, and the oil channels with different functions are distinguished, so there will be no cross-flow and the operation is smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the coordination of the stator and the oil distribution shaft of one embodiment of the utility model.

[0017] Figure 3 It is a structural schematic diagram of a guide rail of an embodiment of the utility model.

[0018] Figure 4 It is a schematic diagram of the wave unit structure of a guide rail in one embodiment of the utility model. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0020] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0021] A hydraulic drive motor, such as Figures 1 to 4As shown, it includes a guide rail 1, a front cover rotor 2, a rear cover rotor 3, a stator 4, an oil distribution plate assembly 5, an oil distribution shaft 6, and a plunger 7.

[0022] Guide rail 1 Figure 3 and 4 As shown, the guide rail 1 is a cylindrical structure, that is, the guide rail 1 is hollow, and the guide rail 1 has an outer surface 11, an inner surface 12 and two end surfaces. The outer surface 11 of the guide rail 1 is a cylindrical outer surface. The inner surface 12 of the guide rail 1 is a curved surface. Specifically, in a plane perpendicular to the axial direction of the cylindrical structure, the inner surface 12 of the guide rail 1 is wavy, and the wavy shape is formed by connecting multiple wavy units end to end in sequence. An object fits the inner surface 12 of the guide rail 1 along Figure 3 The guide rail 1 shown in FIG. 1 moves clockwise in the circumferential direction. When passing through a wave unit, as shown in FIG. Figure 4 As shown, the object will first gradually approach the center line of the guide rail 1, and this section of the distance of the wave unit is assumed to be the downward section 121; the object will then gradually move away from the center line of the guide rail 1, and this section of the distance of the wave unit is assumed to be the upward section 122. Obviously, the downward section 121 and the upward section 122 are arranged symmetrically.

[0023] The front cover rotor 2 and the rear cover rotor 3 are respectively fixedly connected to the two end surfaces of the guide rail 1, and the front cover rotor 2 and the rear cover rotor 3 are fixedly connected to the guide rail 1 by bolts. The front cover rotor 2, the rear cover rotor 3 and the guide rail 1 are connected to form the outer shell or housing of the motor. The housing has an internal cavity, that is, the front cover rotor 2, the rear cover rotor 3 and the guide rail 1 have an enclosed space.

[0024] The oil distribution shaft 6, the stator 4 and the guide rail 1 are sleeved in sequence from the inside to the outside.

[0025] like Figure 1 and Figure 2 As shown, the stator 4 has a central through hole, and the through hole is cylindrical in shape. The stator 4 includes an outer surface, an inner surface and two end surfaces. The outer surface of the stator 4 can be regarded as a rotating surface, and its specific shape can be flexibly designed. The inner surface of the stator 4 is a cylindrical surface, and this cylindrical surface is the wall surface of the central through hole of the stator 4. The stator 4 passes through the inner cavity of the guide rail 1, and the center line of the through hole of the stator 4 coincides with the center line of the guide rail 1. One end of the stator 4 is connected to the rear end cover rotor 3 through the second bearing 9, and the middle part of the stator 4 is connected to the front end cover rotor 2 through a bearing. The other end of the stator 4 passes through the front end cover rotor 2 and is fixedly connected to the oil distribution plate assembly 5. There is a gap between the outer surface of the end of the stator 4 extending into the internal cavity of the shell and the inner surface of the shell.

[0026] The stator 4 is provided with a stator oil inlet passage 41, a stator oil outlet passage 42, a stator oil drain passage 43, a plunger groove oil inlet passage 45, a plunger groove oil return passage 46 and a plunger groove 44. The plunger groove 44 is a groove provided on the outer surface of the stator 4, and a plurality of plunger grooves 44 are provided, and the plurality of plunger grooves 44 are evenly spaced along the circumference of the stator 4. Preferably, the number of the plunger grooves 44 is the same as the number of the wave units.

[0027] There are multiple plungers 7, and the multiple plungers 7 are respectively located in multiple plunger grooves 44. The plunger 7 is equivalent to a piston, which is placed in the plunger groove 44 without being fixedly connected. The plunger 7 fits the circumferential wall surface of the plunger groove 44, so that the plunger 7 and the bottom surface of the plunger groove 44 form a volume space. Preferably, the plunger 7 is spherical. During operation, the plunger 7 keeps in contact with the inner surface 12 of the guide rail 1 under the pressure of the hydraulic oil.

[0028] The stator oil inlet passage 41, the stator oil outlet passage 42, the stator oil drain passage 43, the plunger slot oil inlet passage 45 and the plunger slot oil return passage 46 are all through-hole passages provided on the stator 4. The inlet of the stator oil inlet passage 41 is on one end surface of the stator 4 connected to the oil distribution plate assembly 5, and the outlet is on the inner surface of the stator 4; the inlet of the stator oil outlet passage 42 is on the inner surface of the stator 4, and the outlet is on one end surface of the stator 4 connected to the oil distribution plate assembly 5; the inlet of the plunger slot oil inlet passage 45 is on the inner surface of the stator 4, and the outlet is on the bottom surface of the plunger slot 44; the inlet of the plunger slot oil return passage 46 is on the bottom surface of the plunger slot 44, and the outlet is on the inner surface of the stator 4; the inlet of the stator oil drain passage 43 is on the inner surface of the stator 4, and the outlet is on one end surface of the stator 4 connected to the oil distribution plate assembly 5. Preferably, one stator oil inlet passage 41 is provided, one stator oil drain passage 43 is provided, one stator oil outlet passage 42 is provided, multiple plunger groove oil return passages 46 are provided, and multiple plunger groove oil inlet passages 45 are provided, and each plunger groove 44 is connected to one plunger groove oil return passage 46 and one plunger groove oil inlet passage 45. Preferably, the stator oil inlet passage 41 and the stator oil outlet passage 42 are both L-shaped, and the plunger groove oil inlet passage 45 and the plunger groove oil return passage 46 are both perpendicular to the axial direction of the oil distribution shaft 6.

[0029] like Figure 3 As shown, the oil distribution shaft 6 is a cylinder, and the outer diameter of the oil distribution shaft 6 is equal to the diameter of the middle through hole of the stator 4. The oil distribution shaft 6 is sleeved in the middle through hole of the stator 4, and the outer surface of the oil distribution shaft 6 fits the hole wall of the through hole of the stator 4. The oil distribution shaft 6 and the middle through hole of the stator 4 share the same center line. Figure 1 As shown, one end of the oil distribution shaft 6 is connected to the oil distribution plate assembly 5 via a first bearing 8, and the other end is fixedly connected to the rear end cover rotor 3 via bolts or the like. The first bearing 8 is a thrust ball bearing.

[0030] The oil distribution shaft 6 is provided with an oil inlet groove 61, an oil outlet groove 64, an oil distribution shaft oil inlet passage 62 and an oil distribution shaft oil outlet passage 63. The oil inlet groove 61 is an annular groove formed on the outer surface of the oil distribution shaft 6 along the circumference of the oil distribution shaft 6, and the oil inlet groove 61 is connected to the outlet of the stator oil inlet passage 41. The oil outlet groove 64 is an annular groove formed on the outer surface of the oil distribution shaft 6 along the circumference of the oil distribution shaft 6, and the oil outlet groove 64 is connected to the inlet of the stator oil outlet passage 42. The oil distribution shaft oil inlet passage 62 and the oil distribution shaft oil outlet passage 63 are both through-hole passages on the oil distribution shaft 6. The inlet of the oil distribution shaft oil inlet passage 62 is connected to the oil inlet groove 61, and the outlet is provided on the outer surface of the oil distribution shaft 6; the inlet of the oil distribution shaft oil outlet passage 63 is provided on the outer surface of the oil distribution shaft 6, and the outlet is connected to the oil outlet groove 64. There are multiple oil distribution shaft oil inlet passages 62 and oil distribution shaft oil outlet passages 63, and the length directions of the oil distribution shaft oil inlet passages 62 and oil distribution shaft oil outlet passages 63 are parallel to the axial direction of the oil distribution shaft 6. The oil inlet grooves 61 and the oil outlet grooves 64 are arranged at intervals along the axial direction of the oil distribution shaft 6. Preferably, the oil inlet grooves 61 are closer to the oil distribution plate assembly 5 than the oil outlet grooves 64.

[0031] Based on the above structure, during operation, the stator 4 and the oil distribution plate assembly 5 are fixed, and the oil distribution shaft 6 and the housing of the motor (the front cover rotor 2, the rear cover rotor 3 and the guide rail 1) can rotate relative to the stator 4 as a whole, and can rotate until the outlet of the oil distribution shaft oil inlet passage 62 is connected to the inlet of the plunger groove oil inlet passage 45, and the inlet of the oil distribution shaft oil outlet passage 63 is connected to the outlet of the plunger groove oil return passage 46. For the plunger groove oil inlet passage 45 and the plunger groove oil return passage 46 connected to the same plunger groove 44, the plunger groove oil inlet passage 45 and the plunger groove oil return passage 46 are not connected to the oil passage on the oil distribution shaft 6 at the same time. In other words, for the same plunger groove 44, when the plunger groove oil inlet passage 45 is connected to the oil distribution shaft oil inlet passage 62, the plunger groove oil return passage 46 is not connected to the oil distribution shaft oil outlet passage 63; when the plunger groove oil return passage 46 is connected to the oil distribution shaft oil outlet passage 63, the plunger groove oil inlet passage 45 and the oil distribution shaft oil inlet passage 62 are not connected.

[0032] Furthermore, make the following settings: Figure 3 In the view shown in , when a plunger groove oil inlet channel 45 and an oil distribution shaft oil inlet channel 62 are connected, the position of the plunger 7 in the plunger groove 44 connected to the plunger groove oil inlet channel 45 corresponds to the downward section 121 of one of the wave units on the inner surface 12; when a plunger groove oil return channel 46 and an oil distribution shaft oil outlet channel 63 are connected, the position of the plunger 7 in the plunger groove 44 connected to the plunger groove oil return channel 46 corresponds to the upward section 122 of one of the wave units on the inner surface 12.

[0033] The working process of the motor is described below by taking a plunger groove 44 and a plunger 7 in the plunger groove 44 as an example. When the plunger groove oil inlet passage 45 connected to the plunger groove 44 is connected to an oil distribution shaft oil inlet passage 62 (such as Figure 2The plunger groove 44 at the lower middle part is disconnected from the plunger groove return oil passage 46 connected to the plunger groove 44 and the oil distribution shaft oil outlet passage 63. The outlet of the plunger groove return oil passage 46 is closed by the outer surface of the oil distribution shaft 6, and the inlet of the oil distribution shaft oil outlet passage 63 is closed by the inner surface of the stator 4. The oil in the oil distribution shaft oil inlet passage 62 enters the plunger groove oil inlet passage 45 under pressure, and then enters the plunger groove 44. The oil in the plunger groove 44 pushes the plunger 7. At this time, the plunger 7 contacts the Figure 3 The downward section 121 in the oil distribution shaft 6 moves in the direction away from the center line, and the plunger 7 pushes the guide rail 1, so that Figure 3 The guide rail 1 in the stator 4 rotates clockwise, and the guide rail 1 drives the front cover rotor 2, the rear cover rotor 3, and the oil distribution shaft 6 to rotate synchronously. As the oil distribution shaft 6 continues to rotate, the oil distribution shaft oil inlet passage 62 connected to the plunger groove 44 will be opened, the inlet of the plunger groove oil inlet passage 45 will be closed by the outer surface of the oil distribution shaft 6, and the outlet of the oil distribution shaft oil inlet passage 62 will be closed by the inner surface of the stator 4. At the same time, the guide rail 1 rotates to the upper section 122 to contact the plunger 7, and the plunger groove oil return passage 46 connected to the plunger groove 44 is connected to the oil distribution shaft oil outlet passage 63 (see FIG. Figure 2 The plunger groove 44 in the upper middle corresponds to the plunger groove oil return channel 46), the oil in the plunger groove 44 flows into the plunger groove oil return channel 46, then enters the oil distribution shaft oil outlet channel 63, and finally flows out from the stator oil outlet channel 42 through the oil outlet groove 64. As the oil distribution shaft 6 continues to rotate, the entrance of the oil distribution shaft oil outlet channel 63 is turned open, and the outlet of the oil distribution shaft oil outlet channel 63 corresponding to this plunger groove 44 will be closed by the outer surface of the oil distribution shaft 6, and the oil distribution shaft 6 and the guide rail 1 are rotated as a whole until the plunger 7 contacts the next descending section 121 of the wave unit, and at the same time, the plunger groove oil inlet channel 45 is connected to the next oil distribution shaft oil inlet channel 62, and the above process is repeated. During the design, a part of the plunger 7 initially contacts the descending section 121, and a part of the plunger 7 contacts the ascending section 122. During operation, a part of the plunger 7 always contacts the descending section 121 to push the guide rail 1, and multiple plungers 7 realize the continuous rotation of the guide rail 1 through the above process.

[0034] The oil leaked between the stator 4 and the oil distribution shaft 6 is discharged through the stator oil drain channel 43. The outer surface of the oil inlet groove 61 is sealed by the inner surface of the stator 4 except that it is connected to the stator oil inlet channel 41; similarly, the outer surface of the oil outlet groove 64 is sealed by the inner surface of the stator 4 except that it is connected to the stator oil outlet channel 42. In order to reduce oil leakage, oil seals are provided between the oil inlet groove 61, the oil outlet groove 64 and the inner surface of the stator 4.

[0035] The number of the oil distribution shaft oil inlet passages 62 , the number of the oil distribution shaft oil outlet passages 63 , and the number of the plunger grooves 44 may be the same or different, and their specific numbers may be flexibly set.

[0036] When the guide rail 1 needs to be driven in the reverse direction to rotate, the flow direction of the hydraulic oil can be changed, that is, the hydraulic oil enters the motor from the stator oil outlet passage 42 and flows out from the stator oil inlet passage 41 .

[0037] Finally, it is necessary to explain here that the above embodiments are only used to further illustrate the technical solution of the utility model in detail and cannot be understood as limiting the protection scope of the utility model. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the utility model belong to the protection scope of the utility model.

Claims

1. A hydraulic drive motor, characterized in that: The invention comprises a guide rail (1), a front cover rotor (2), a rear cover rotor (3), a stator (4), an oil distribution plate assembly (5), an oil distribution shaft (6) and a plunger (7); the guide rail (1) is a cylindrical structure with a curved inner surface; the front cover rotor (2) and the rear cover rotor (3) are respectively fixedly connected to the two end surfaces of the guide rail (1); the oil distribution shaft (6), the stator (4) and the guide rail (1) are sleeved in sequence from the inside to the outside; one end of the stator (4) and the rear cover rotor (3) are connected via a second bearing (9); the middle part of the stator (4) and the front cover rotor (2) are connected via a bearing; the other end of the stator (4) passes through the front cover rotor (2) and the rear cover rotor (3); The end cover rotor (2) is fixedly connected to the oil distribution plate assembly (5) at the rear, one end of the oil distribution shaft (6) is connected to the oil distribution plate assembly (5) via a first bearing (8), and the other end is fixedly connected to the rear end cover rotor (3). The outer surface of the stator (4) is provided with a plurality of plunger grooves (44) along the circumferential direction, each plunger groove (44) has a plunger (7) in it, and the oil distribution shaft (6) is provided with an oil distribution shaft oil inlet passage (62) and an oil distribution shaft oil outlet passage (63) for hydraulic oil to flow through. As the oil distribution shaft (6) and the guide rail (1) rotate, the plunger grooves (44) are alternately connected to the oil distribution shaft oil inlet passage (62) and the oil distribution shaft oil outlet passage (63).

2. The hydraulic drive motor according to claim 1, characterized in that: The stator (4) is provided with a stator oil inlet passage (41) and a stator oil outlet passage (42); one end of the stator oil inlet passage (41) is connected to the oil distribution shaft oil inlet passage (62) and the other end is connected to an external oil inlet pipe; one end of the stator oil outlet passage (42) is connected to the oil distribution shaft oil outlet passage (63) and the other end is connected to an external oil return pipe.

3. The hydraulic drive motor according to claim 2, characterized in that: The oil distribution shaft (6) is also provided with an oil inlet groove (61) and an oil outlet groove (64). The oil inlet groove (61) is an annular groove formed on the outer surface of the oil distribution shaft (6) along the circumference of the oil distribution shaft (6). The stator oil inlet passage (41), the oil inlet groove (61) and the oil distribution shaft oil inlet passage (62) are connected in sequence. The end of the oil distribution shaft oil inlet passage (62) away from the oil inlet groove (61) is alternately connected to each plunger groove (44) as the oil distribution shaft (6) rotates. The oil outlet groove (64) is an annular groove formed on the outer surface of the oil distribution shaft (6) along the circumference of the oil distribution shaft (6). An annular groove is provided in a circle, and the stator oil outlet passage (42), the oil outlet groove (64) and the oil distribution shaft oil outlet passage (63) are connected in sequence. The end of the oil distribution shaft oil outlet passage (63) away from the oil outlet groove (64) is alternately connected with each plunger groove (44) as the oil distribution shaft (6) rotates. The plunger groove (44) is not connected with the oil distribution shaft oil inlet passage (62) and the oil distribution shaft oil outlet passage (63) at the same time. The oil distribution shaft oil inlet passage (62) and the oil distribution shaft oil outlet passage (63) are each provided with at least one, and the outer surface of the oil distribution shaft (6) and the inner surface of the stator (4) are in contact with each other.

4. The hydraulic drive motor according to claim 3, characterized in that: The stator (4) is also provided with a plunger groove oil inlet passage (45) and a plunger groove oil return passage (46). One end of the plunger groove oil inlet passage (45) is connected to the plunger groove (44), and the port at the other end is on the inner surface of the stator (4). One end of the plunger groove oil return passage (46) is connected to the plunger groove (44), and the port at the other end is on the inner surface of the stator (4). As the oil distribution shaft (6) rotates, the port of the plunger groove oil inlet passage (45) on the inner surface of the stator (4) is alternately connected to the oil distribution shaft oil inlet passage (62) and is closed by the outer surface of the oil distribution shaft (6), and the port of the plunger groove oil return passage (46) on the inner surface of the stator (4) is alternately connected to the oil distribution shaft oil outlet passage (63) and is closed by the outer surface of the oil distribution shaft (6).

5. The hydraulic drive motor according to claim 2, characterized in that: The external oil inlet pipe passes through the oil distribution plate assembly (5) and then communicates with the stator oil inlet passage (41), and the external oil return pipe passes through the oil distribution plate assembly (5) and then communicates with the stator oil outlet passage (42).

6. The hydraulic drive motor according to claim 2, characterized in that: The stator (4) is also provided with a stator oil leakage passage (43), one end of which is connected to the inner surface of the stator (4) and the other end of which is connected to an external oil leakage pipe.

7. The hydraulic drive motor according to any one of claims 1 to 6, characterized in that: In a plane perpendicular to the axial direction of the guide rail (1), the inner surface (12) of the guide rail (1) is wavy, and the wavy shape is formed by connecting a plurality of wavy units end to end in sequence, and the wavy units include a symmetrically arranged downward section (121) and an upward section (122).

8. The hydraulic drive motor according to claim 7, characterized in that: When the plunger groove (44) is connected to the oil inlet passage (62) of the oil distribution shaft, the position of the plunger (7) in the plunger groove (44) corresponds to a downward section (121) of a wave unit on the inner surface (12); when the plunger groove (44) is connected to the oil outlet passage (63) of the oil distribution shaft, the position of the plunger (7) in the plunger groove (44) corresponds to an upward section (122) of a wave unit on the inner surface (12).

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