Hydraulic driving motor without oil distributor

Abstract

The utility model discloses a hydraulic driving motor without an oil distributor, which comprises a main shaft, a rotor, a stator, plungers and a control valve, a stator main body part of the stator is provided with a plurality of plunger grooves arranged along the circumferential direction of the stator, each plunger groove is internally and movably provided with one plunger, and each plunger groove is communicated with one plunger groove first oil passage; the inner surface of a middle rotor of the rotors is in a wave shape in the circumferential direction, the plungers are pushed by hydraulic oil in plunger grooves to make contact with and push the middle rotor, the end cover rotors are provided with a plurality of wave-shaped guide rails located in the same ring, the control valve penetrates through first oil channels of the plunger grooves, and the two ends of the control valve make contact with the guide rails on the two end cover rotors respectively. Along with the rotation of the rotors, the guide rails on the rotors of the two end covers push the control valves to reciprocate, so that the control valves alternately seal the two ends of the first oil ducts of the plunger grooves. Oil inlet and oil outlet of each plunger groove are controlled through reciprocating motion of the control valve, the oil way sealing performance is good, and the axial size and the size of the motor are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering vehicle drive motors, and particularly relates to a hydraulic drive motor without an oil distributor. Background Art

[0002] In engineering technical fields such as wind power installation, mines, factory areas, port terminals, and special environment work areas, the construction sites are generally located in mountainous areas and other places with extremely poor road traffic conditions. The equipment required at the construction site is often relatively large, such as wind turbine blades. This poses higher requirements for transport engineering vehicles, requiring them to have strong climbing ability, cross-country ability, and a safer downhill ability. In the prior art, there are still many defects in the above-mentioned engineering transport vehicles. For example, there are many steep slopes on mountain roads. When the vehicle goes downhill, it often needs to continuously brake to make the vehicle go downhill safely. However, due to the large tonnage of the engineering vehicle, continuous braking will seriously affect the brake life. Currently, fire accidents and major accidents caused by frictional heat generation due to the current braking mode occur from time to time. In addition, many existing hydraulic drive motors require a dedicated and complex oil distributor to distribute hydraulic oil for the motor to achieve the periodic operation of the motor. This often results in a large axial dimension and volume of the motor, and the oil distributor itself operates or needs to cooperate with other operating components to achieve the periodic connection of the oil circuit, that is, the oil circuit is distributed on two components that move relative to each other, resulting in a complex oil circuit and poor sealing performance. Summary of the Utility Model

[0003] Aiming at the above problems existing in the prior art, the purpose of the utility model is to provide a hydraulic drive motor without an oil distributor, which can adjust the power torque of the vehicle body by adjusting the pressure of the hydraulic oil. The vehicle speed can be adjusted flexibly, a large driving torque can be achieved, it has a large load capacity, is flexible and maneuverable, overcomes the shortcoming of the existing vehicle only reducing speed by stepping on the brake, can achieve slow-speed driving by reducing the pressure of the hydraulic oil, realizes speed reduction, can be used as an additional brake for heavy vehicles, increases the braking efficiency, improves the safety factor of the vehicle and the service life of the brake, is suitable for transporting medium and large-sized equipment in road conditions such as factories, mines, port terminals, and mountainous areas, and can achieve overloading and overweight transportation; the reciprocating movement of the control valve controls the oil inlet and outlet of each plunger groove. The reciprocating movement of the control valve is pushed by the guide rails on two rotating rotor end covers, which is a pure mechanical structure with precise control. The control valve passes through the stator and does not need to separately occupy a large axial space. The hydraulic oil channels on the motor are all on the stator and are not distributed on two components that move relative to each other, so the oil circuit has good sealing performance, does not need to set a complex oil distributor, greatly reduces the axial dimension and volume of the motor, and the motor has a higher service life and power.

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

[0005] A hydraulic drive motor without an oil distributor, comprising a main shaft, a rotor, a stator, a plunger and a control valve. The stator is fixedly sleeved outside the main shaft;

[0006] The stator includes a stator main body portion integrally connected and two stator connection portions respectively located on both sides of the stator main body portion. The stator main body portion is provided with a plurality of plunger grooves, and the plunger grooves are grooves provided on the circumferential outer surface of the stator main body portion. The plurality of plunger grooves are evenly spaced along the circumferential direction of the stator. A plunger is movably arranged in each plunger groove, and each plunger groove is equipped with a first oil passage of the plunger groove. The two ends of the first oil passage of the plunger groove are respectively the inlet and outlet of hydraulic oil, and the middle part is communicated with the plunger groove;

[0007] The vehicle tire is rotatably sleeved outside the rotor. The rotor includes a middle rotor and two end-cover rotors. The two end-cover rotors are respectively fixedly connected to the two end faces of the middle rotor. The two end-cover rotors are respectively sleeved outside the two stator connection portions through bearings. The inner surface of the middle rotor is wavy along the circumferential direction. The plunger contacts the inner surface of the middle rotor and pushes the middle rotor to rotate under the push of the hydraulic oil in the plunger groove. A plurality of wavy guide rails located in the same ring are provided on the end face of each end-cover rotor facing the other end-cover rotor. The concave and convex trends of the guide rails on the two end-cover rotors are arranged alternately;

[0008] The control valve includes a connecting rod portion and two large head portions thicker than the connecting rod portion connected to both ends of the connecting rod portion. The control valve passes through the first oil passage of the plunger groove. The outer diameter of the connecting rod portion is smaller than the aperture of the first oil passage of the plunger groove. The two large head portions can be respectively inserted into and close the two ends of the first oil passage of the plunger groove. The two end portions of the control valve respectively contact the guide rails on the two end-cover rotors. As the rotor rotates, the guide rails on the two end-cover rotors push the control valve to reciprocate, so that the control valve alternately closes the two ends of the first oil passage of the plunger groove.

[0009] As a further improvement of the above technical solution:

[0010] Each plunger groove is also equipped with a first stator oil passage, a second stator oil passage and a second plunger groove oil passage. One inlet and outlet of the first stator oil passage is arranged on the inner surface of the stator main body portion, and the other inlet and outlet is communicated with one end of the first oil passage of the plunger groove. The other end of the first oil passage of the plunger groove is communicated with one end of the second stator oil passage. The inlet and outlet of the other end of the second stator oil passage is arranged on the inner surface of the stator main body portion. One end of the second plunger groove oil passage is communicated with the middle part of the first oil passage of the plunger groove, and the other end is communicated with the plunger groove.

[0011] One of the first stator oil passage and the second stator oil passage is an oil inlet passage, and the other is an oil outlet passage. The first stator oil passage and the second stator oil passage are both passages arranged in the radial direction of the stator main body portion. The length direction of the first oil passage of the plunger groove is parallel to the axial direction of the stator.

[0012] The stator main body is also provided with a stator oil drain passage for guiding and discharging the leaked hydraulic oil in the motor. The stator oil drain passage includes a first stator oil drain passage and a second stator oil drain passage. The first stator oil drain passage is a groove provided on the inner surface of the stator, and the first stator oil drain passage is arranged in a circle along the circumferential direction of the inner surface of the stator. One end of the second stator oil drain passage communicates with the first stator oil drain passage, and the port at the other end is arranged on the circumferential outer surface of the stator main body.

[0013] The inner surface of the stator is also provided with a first groove and a second groove. Both the first groove and the second groove are grooves provided on the inner surface of the stator and are both grooves arranged in a circle along the circumferential direction of the inner surface of the stator. Each stator first oil passage communicates with the first groove, and each stator second oil passage communicates with the second groove. The main shaft is provided with radial first holes, second holes and oil drain holes. When the stator is sleeved on the main shaft, the first hole communicates with the first groove, the second hole communicates with the second groove, and the oil drain hole communicates with the first stator oil drain passage. The first hole, the second hole and the oil drain hole on the main shaft all communicate with the axial through hole of the main shaft.

[0014] The external oil drain pipe passes through the axial through hole of the main shaft and then inserts into the oil drain hole. The external oil inlet pipe passes through the axial through hole of the main shaft and then inserts into the first hole or the second hole. The external oil return pipe passes through the axial through hole of the main shaft and then inserts into the second hole or the first hole.

[0015] The length of the connecting rod part is equal to the length of the first oil passage of the plunger groove.

[0016] The beneficial effects of the utility model are as follows:

[0017] (1) By changing the flow direction of the hydraulic oil, the motor housing is driven forward and backward, thereby realizing the forward and backward driving of the wheel.

[0018] (2) By adjusting the pressure of the hydraulic oil, the power torque of the vehicle body is adjusted. The vehicle speed can be adjusted flexibly, a large driving torque can be achieved, the load capacity is large, and the operation is flexible. It overcomes the shortcoming of the existing vehicle that only brakes are used to reduce the speed. The vehicle can be driven slowly by reducing the pressure of the hydraulic oil to achieve speed reduction, and can be used as an additional brake for heavy vehicles to increase the braking efficiency, improve the safety factor of the vehicle and the service life of the brake, and is suitable for transporting medium and large-sized equipment in road conditions such as factories, mines, port terminals, mountains, and the military.

[0019] (3) The oil inlet and outlet of each plunger groove are controlled by the reciprocating movement of the control valve. The reciprocating movement of the control valve is driven by the guide rails on the two rotating rotor end caps, which is a pure mechanical structure with precise control. The control valve passes through the stator and does not require a large separate axial space. The hydraulic oil channels on the motor are all on the stator and are not distributed on the two moving parts, ensuring good oil circuit sealing. There is no need to set up a complex oil distributor, greatly reducing the axial size and volume of the motor, and increasing the service life and power of the motor.

[0020] (4) The free travel component prevents the plunger from contacting the inner surface of the middle rotor when not under hydraulic oil pressure, thus preventing the plunger from generating frictional resistance on the rotor when the vehicle equipped with the motor is in free travel. Free travel means the vehicle is running when being towed and not driven by the motor.

[0021] (5) Driven by hydraulic oil, it is convenient for automatic and intelligent settings with other controls of the vehicle body and is beneficial for energy conservation and emission reduction. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0023] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0024] Figure 3 is a schematic diagram of the matching structure of the middle rotor and the plunger of the motor in an embodiment of the present utility model.

[0025] Figure 4 is a schematic structural diagram of the end cover rotor in an embodiment of the present utility model.

[0026] Figure 5 is a schematic structural diagram of the stator of the motor in an embodiment of the present utility model.

[0027] Figure 6 is a schematic diagram of the operation of the control valve after the circumferential expansion of the end cover rotor and the motor in an embodiment of the present utility model. Detailed Embodiments

[0028] The following details the specific embodiments of the present utility model with reference to the drawings. It should be understood that the specific embodiments described herein are only for explaining and illustrating the present utility model and are not used to limit the present utility model.

[0029] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding interpretations of the spatial relative descriptions used herein will be made.

[0030] A hydraulic drive motor without an oil distributor, such as Figures 1 to 6 shown, the motor is a hydraulic motor, such as Figure 1 shown, the motor includes a main shaft 7, a rotor, a stator 2, a free travel assembly 4, a plunger 5, and a control valve 3. The stator 2 is fixedly connected to the main shaft 7, and the rotor can rotate relative to the stator 2 with the main shaft 7 as the central axis.

[0031] When the motor is installed on a vehicle, the main shaft 7 and the drive axle shaft are coaxially and fixedly connected. The main shaft 7 is provided with an axial through hole and a radial through hole.

[0032] The rotor includes a middle rotor 11 and end cap rotors. There are two end cap rotors, namely a front end cap rotor 12 and a rear end cap rotor 13. The front end cap rotor 12 and the rear end cap rotor 13 are respectively fixedly connected to the two end faces of the middle rotor 11, and the front end cap rotor 12 and the rear end cap rotor 13 are fixedly connected to the middle rotor 11 by bolts. The middle rotor 11 is as Figures 1 to 3 shown, the middle rotor 11 is a cylindrical structure, that is, the middle rotor 11 is hollow, and the middle rotor 11 has an outer surface 111, an inner surface 112, and two end faces, as Figure 3 shown. The outer surface 111 of the middle rotor 11 is a cylindrical outer surface. The inner surface 112 of the middle rotor 11 is a curved surface. Specifically, in a plane perpendicular to the axial direction of the middle rotor 11, the inner surface 112 of the middle rotor 11 is wavy, and the wavy shape is formed by sequentially connecting a plurality of wave units end to end. An object fits against the inner surface 112 of the middle rotor 11 and moves clockwise along the Figure 3 circumference of the middle rotor 11 as shown. When passing through one of the wave units, the object will first gradually approach the central axis of the middle rotor 11. Let this section of the path of the wave unit be the downward section 1121; the object will then gradually move away from the central axis of the middle rotor 11. Let this section of the path of the wave unit be the upward section 1122.

[0033] The front end cover rotor 12, the rear end cover rotor 13 and the middle rotor 11 are connected to form the outer shell or housing of the motor. The housing has an internal cavity, that is, the front end cover rotor 12, the rear end cover rotor 13 and the middle rotor 11 have an enclosed space.

[0034] The end cover rotor is as Figure 4 shown, and is a cylindrical structure with a relatively thin thickness, or is an annular plate-like structure. A plurality of guide rails 14 are provided on one end face of the end cover rotor. The guide rails 14 are structures protruding from the end face of the end cover rotor. The guide rails 14 are in an arch shape or a wave shape, that is, along the length direction of the guide rails 14, the height of the guide rails 14 first gradually increases and then gradually decreases. In other words, when an object moves along the upper surface B of the guide rails 14, the distance between the object and the end face C of the end cover rotor first increases and then decreases, changing periodically in this way. The plurality of guide rails 14 are evenly arranged on the same ring, and this ring and the end cover rotor share the same central axis. During installation, the side of the front end cover rotor 12 provided with the guide rails 14 faces the side of the rear end cover rotor 13 provided with the guide rails 14, and the guide rails 14 on the front end cover rotor 12 and the guide rails 14 on the rear end cover rotor 13 are staggered, that is, the top of the guide rails 14 on the front end cover rotor 12 is directly opposite to the connection point between two adjacent guide rails 14 on the rear end cover rotor 13. The connection point between two adjacent guide rails 14 is the bottom or the lowest point of the guide rails 14. In this way, axially, the distance from any point on the upper surface B of the guide rails 14 of the front end cover rotor 12 to the guide rails 14 on the rear end cover rotor 13 is equal everywhere.

[0035] The stator 2 is as Figure 5 shown. The stator 2 has a central through hole. The shape of the through hole is cylindrical, and this through hole is for the main shaft 7 to pass through. The stator 2 is fixedly sleeved on one end of the main shaft 7. Preferably, a ring of teeth is provided on the inner wall of the through hole of the stator 2, and a ring of teeth is provided on the outer surface of one end of the main shaft 7. The teeth on the stator 2 and the teeth on the main shaft 7 are engaged with each other, so that the stator 2 and the main shaft 7 are relatively fixedly connected together.

[0036] The stator 2 includes a stator main body part 22 and two stator connection parts 21 that are integrally connected. The two stator connection parts 21 are respectively located on both sides of the main body part 201. The stator main body part 22 and the stator connection parts 21 are both cylindrical. The outer diameter of the stator main body part 22 is larger than the outer diameter of the stator connection parts 21. The front end cover rotor 12 is sleeved outside one stator connection part 21 through a bearing 6, and the rear end cover rotor 13 is sleeved outside the other stator connection part 21 through another bearing 6. The main body part 201 is located in the space enclosed by the front end cover rotor 12, the rear end cover rotor 13 and the middle rotor 11. In other words, the main body part 201 is located between the front end cover rotor 12 and the rear end cover rotor 13, and the stator main body part 22 does not contact the middle rotor 11, the front end cover rotor 12, and the rear end cover rotor 13. The stator 2, the middle rotor 11, the front end cover rotor 12, and the rear end cover rotor 13 share the same central axis.

[0037] The stator main body 22 is provided with a first stator oil passage 221, a second stator oil passage 222, a stator oil drain passage, a first plunger groove oil passage 225, a second plunger groove oil passage 226 and a plunger groove 224, as shown in Figure 1 , 2 and 5. The plunger groove 224 is a groove provided on the circumferential outer surface of the stator main body 22. There are a plurality of plunger grooves 224, and the plurality of plunger grooves 224 are arranged at equal intervals along the circumferential direction of the stator 2.

[0038] There are a plurality of plungers 5, and the plurality of plungers 5 can be respectively inserted into the plurality of plunger grooves 224. The plunger 5 is equivalent to a piston, placed in the plunger groove 224 without being fixedly connected. The plunger 5 is in contact with the circumferential wall surface of the plunger groove 224, so that a volume space is formed between the plunger 5 and the bottom surface of the plunger groove 224. When the plunger 5 reciprocates in the plunger groove 224 in a piston-like manner, the volume of the volume space changes. In this embodiment, one end of the plunger 5 close to the bottom surface of the plunger groove 224 is cylindrical, and the end far from the bottom surface of the plunger groove 224 is conical-like. One end of the plunger 5 is located in the plunger groove 224, and the other end is located outside the plunger groove 224, that is, the plunger 5 extends beyond the plunger groove 224.

[0039] The first stator oil passage 221, the second stator oil passage 222, the stator oil drain passage, the first plunger groove oil passage 225, and the second plunger groove oil passage 226 are all passages provided on the stator main body 22. Each plunger groove 224 is equipped with a first stator oil passage 221, a second stator oil passage 222, a first plunger groove oil passage 225, and a second plunger groove oil passage 226. One of the first stator oil passage 221 and the second stator oil passage 222 is an oil inlet passage, and the other is an oil outlet passage. The hydraulic oil in the oil inlet passage sequentially passes through the first plunger groove oil passage 225 and the second plunger groove oil passage 226 to enter the plunger groove 224 and push the plunger 5 to move. The hydraulic oil in the plunger groove 224 sequentially passes through the second plunger groove oil passage 226 and the first plunger groove oil passage 225 and flows to the oil outlet passage, as shown in Figure 1 and 2As shown, one inlet / outlet of the first stator oil passage 221 is provided on the inner surface of the stator main body 22, and the other inlet / outlet communicates with one end of the first oil passage 225 in the plunger groove. The other end of the first oil passage 225 in the plunger groove communicates with one end of the second stator oil passage 222. The inlet / outlet at the other end of the second stator oil passage 222 is provided on the inner surface of the stator main body 22. One end of the second oil passage 226 in the plunger groove communicates with the middle part of the first oil passage 225 in the plunger groove, and the other end communicates with the plunger groove 224. The connection part between the plunger groove 224 and the second oil passage 226 in the plunger groove is located on the bottom surface of the plunger groove 224. Specifically, when viewed axially from the stator 2, the first stator oil passage 221 and the second stator oil passage 222 are respectively located on both sides of the plunger groove 224. The first stator oil passage 221 and the second stator oil passage 222 are both channels provided radially on the stator main body 22. The length direction of the first oil passage 225 in the plunger groove is parallel to the axial direction of the stator 2, and the first oil passage 225 in the plunger groove is located between the plunger groove 224 and the middle through hole of the stator 2.

[0040] The stator oil drain passage is used to guide and drain the leaked hydraulic oil in the motor. The stator oil drain passage includes a first stator oil drain passage 223 and a second stator oil drain passage (not shown in the figure). The first stator oil drain passage 223 is a groove provided on the inner surface of the stator 2. The first stator oil drain passage 223 is arranged in a circle along the circumferential direction of the inner surface of the stator 2. When the main shaft 7 is connected to the stator 2, the outer surface of the main shaft 7 fits the inner surface of the stator 2, and a channel capable of accommodating hydraulic oil is formed between the outer surface of the main shaft 7 and the first stator oil drain passage 223. The second stator oil drain passage is a radial through hole on the stator main body 22. One end of the second stator oil drain passage communicates with the first stator oil drain passage 223, and the port at the other end is provided on the circumferential outer surface of the stator main body 22. There are multiple second stator oil drain passages, and one second stator oil drain passage is provided between adjacent two plunger grooves 224.

[0041] There are multiple control valves 3, and each plunger groove 224 is equipped with a control valve 3. The control valve 3 includes a connecting rod part 32 and two large head parts 31. The two large head parts 31 are respectively connected to both ends of the connecting rod part 32. The large head part 31 and the connecting rod part 32 are both rod-shaped structures. The length directions of the large head part 31 and the connecting rod part 32 are the same. The diameter of the large head part 31 is larger than the diameter of the connecting rod part 32. The diameter of the connecting rod part 32 is smaller than the aperture of the first oil passage 225 in the plunger groove, and the diameter of the large head part 31 is not less than the aperture of the first oil passage 225 in the plunger groove. The length direction of the control valve 3 is parallel to the axial direction of the stator 2. The control valve 3 passes through the stator main body 22. Specifically, the control valve 3 passes through the first oil passage 225 in the plunger groove. The two end parts in the length direction of the control valve 3 respectively contact the upper surface B of the guide rail 14 on the front end cover rotor 12 and the upper surface B of the guide rail 14 on the rear end cover rotor 13. In other words, one large head part 31 contacts the upper surface B of the guide rail 14 on the front end cover rotor 12, and the other large head part 31 contacts the upper surface B of the guide rail 14 on the rear end cover rotor 13.

[0042] Based on the above structure, when the rotor rotates relative to the stator 2, the control valve 3 can move along the length direction of the first oil passage 225 of the plunger groove under the action of the guide rails 14 on the front end cover rotor 12 and the guide rails 14 on the rear end cover rotor 13. Specifically, as Figure 6 shown in the schematic diagram after unfolding the front end cover rotor 12 and the rear end cover rotor 13 along their respective circumferences, the synchronous rotation of the front end cover rotor 12 and the rear end cover rotor 13 is equivalent to Figure 6 in which the unfolded front end cover rotor 12 and the rear end cover rotor 13 move up and down synchronously. When one large head 31 of the control valve 3 contacts the junction between two adjacent guide rails 14 of the front end cover rotor 12, the other large head 31 contacts the top of the upper surface B of a guide rail 14 of the rear end cover rotor 13, as Figure 6 the control valve 3 shown by the solid line in Figure 6 . As the front end cover rotor 12 and the rear end cover rotor 13 rotate, the front end cover rotor 12 will push the control valve 3 towards Figure 6 the right in Figure 6 until one large head 31 of the control valve 3 contacts the top of the upper surface B of a guide rail 14 of the front end cover rotor 12, and the other large head 31 contacts the junction between two adjacent guide rails 14 of the rear end cover rotor 13, as Figure 6 the control valve 3 shown by the dashed line in Figure 6 . As the front end cover rotor 12 and the rear end cover rotor 13 continue to rotate, the rear end cover rotor 13 will push the control valve 3 towards Figure 6 the left in

[0043] Figure 6 until the control valve 3 reaches the state shown by the solid line in Figure 6 . Obviously, the left and right movement of the control valve 3 is the reciprocating movement of the control valve 3 in the axial direction of the stator 2 or the rotor. It should be noted that in Figure 6 , the front end cover rotor 12 and the rear end cover rotor 13 move up or down relative to the control valve 3. To clarify the change of the control valve 3, in Figure 6 , the two states of the control valve 3 are represented by solid lines and dashed lines.The above reciprocating movement of the control valve 3 is to control that only one of the oil inlet passage and the oil outlet passage of the plunger groove 224 is in an open state at the same time. In other words, the control valve 3 can control the connection and disconnection of two passages, namely, the passage between the first stator oil passage 221 and the first plunger groove oil passage 225, and the passage between the second stator oil passage 222 and the first plunger groove oil passage 225. Specifically, the control valve 3 can move to a large head 31 to block and cut off the passage between the first stator oil passage 221 and the first plunger groove oil passage 225, while the other large head 31 does not block the passage between the second stator oil passage 222 and the first plunger groove oil passage 225. In other words, under the action of the control valve 3, when one of the passage between the first stator oil passage 221 and the first plunger groove oil passage 225 and the passage between the second stator oil passage 222 and the first plunger groove oil passage 225 is connected, the other is disconnected, that is, the two must be one disconnected and the other connected at the same time, and cannot be connected or disconnected at the same time.

[0044] In order to ensure that the above two passages are one disconnected and the other connected at the same time, the length of the connecting rod portion 32 is equal to the length of the first plunger groove oil passage 225. The length of the first plunger groove oil passage 225 is its axial dimension, and the outer diameter of the large head 31 is equal to the aperture of the first plunger groove oil passage 225, that is, the large head 31 can be inserted into the first plunger groove oil passage 225. When the control valve 3 is in Figure 6 the position and state shown by the solid line in the figure, the large head 31 in the first stator oil passage 221 is not inserted into the first plunger groove oil passage 225, and there is a space between the first plunger groove oil passage 225 and the connecting rod portion 32. This space is connected to the first stator oil passage 221, that is, the passage between the first stator oil passage 221 and the first plunger groove oil passage 225 is connected; the large head 31 in the second stator oil passage 222 is partially inserted into the first plunger groove oil passage 225 to block one end of the first plunger groove oil passage 225, that is, the passage between the second stator oil passage 222 and the first plunger groove oil passage 225 is cut off. When the control valve 3 moves to the right, the large head 31 in the first stator oil passage 221 gradually approaches the first plunger groove oil passage 225, and the large head 31 in the second stator oil passage 222 gradually withdraws from the first plunger groove oil passage 225. When the large head 31 of the first stator oil passage 221 just enters the first plunger groove oil passage 225, the large head 31 in the second stator oil passage 222 completely withdraws from the first plunger groove oil passage 225. At this time, the passage between the first stator oil passage 221 and the first plunger groove oil passage 225 is cut off, and the passage between the second stator oil passage 222 and the first plunger groove oil passage 225 is about to be connected. When the control valve 3 continues to move to the right, the large head 31 at one end of the first stator oil passage 221 continues to penetrate into the first plunger groove oil passage 225, and the large head 31 at one end of the second stator oil passage 222 continues to move away from the first plunger groove oil passage 225. The left end of the first plunger groove oil passage 225 continues to be blocked, and the right end is connected to the second stator oil passage 222, as shown in Figure 2 the figure.

[0045] It should be noted that during processing, for the convenience of processing the first stator oil passage 221 and the second stator oil passage 222, a radial hole that radially penetrates the stator main body 22 can be machined on the circumferential outer surface of the stator main body 22. This radial hole is divided into two sections by the control valve 3. One section close to the central axis of the stator 2 is the first stator oil passage 221 or the second stator oil passage 222, and the other section far from the central axis of the stator 2 is the auxiliary hole 227. The two can be separated by a seal.

[0046] The freewheel assembly 4 is used to hold the plunger 5 in place to prevent the plunger 5 from contacting the inner surface of the middle rotor 11 and hindering the rotation of the middle rotor 11 without the pressure of hydraulic oil. The freewheel assembly 4 includes a plunger top roller 41 and two springs 42. The plunger top roller 41 passes through one end of the plunger 5 that extends beyond the plunger groove 224. The two springs 42 are respectively connected to both ends of the plunger top roller 41, and the two springs 42 are respectively located in two auxiliary holes 227 on both sides of the plunger groove 224. One end of the spring 42 is fixed in the auxiliary hole 227, and the other end is connected to one end of the plunger top roller 41.

[0047] It should be noted that when installing the spring 42, one end of the spring 42 can be first connected to a connecting block, and the connecting block is placed into the auxiliary hole 227. Then, a bolt or screw is horizontally passed through the auxiliary hole 227 from the outside. When the bolt or screw horizontally passes through the auxiliary hole 227, it will pass through the connecting block, thus fixing one end of the spring 42 located in the auxiliary hole 227.

[0048] The two springs 42 should ensure that the pulling force on the plunger 5 satisfies the following conditions: when the vehicle where the motor is located is in freewheel, the two springs 42 pull the plunger 5 so that the plunger 5 does not contact the inner surface of the middle rotor 11. To meet the above conditions, during specific design and manufacture, the centrifugal force of the plunger 5 can be obtained based on data such as the set freewheel speed and the outer diameter of the middle rotor 11. According to this centrifugal force, the spring 42 and the position of the spring 42 in the auxiliary hole 227 are selected so that the movement of the plunger 5 caused by the elongation of the spring 42 under this centrifugal force does not touch the inner surface of the middle rotor 11. Those skilled in the art can calculate the specific dimension values based on physical theorems and specific design requirements, which will not be elaborated here.

[0049] The number of the guide rails 14 is the same as that of the wave units, and the number of the wave units is determined according to the driving torque, rotational speed, and power requirements, which can be flexibly determined during the specific design. The process of oil intake and oil discharge in the plunger groove 224 corresponds to one working cycle of the plunger 5. The plunger 5 passes through one wave unit corresponding to one working cycle, and the control valve 3 passing through one guide rail 14 also corresponds to one working cycle of the plunger 5. The opening and closing moments or positions of each end of the first oil passage 225 of the plunger groove are determined by the two end positions of the reciprocating movement of the plunger 5, that is, the upper and lower dead points. In other words, during the specific design, first determine the upper and lower dead point positions of the reciprocating movement of the plunger 5. When the plunger 5 is at the dead point position, the control valve 3 is exactly in the position where one end of the first oil passage 225 of the plunger groove is changed from open to closed and the other end is changed from closed to open. The number of the plungers 5 is greater than that of the wave units. Preferably, the number of the plungers 5 is twice that of the wave units.

[0050] Based on the above structure, the working principle and process of the present utility model are as follows: The oil inlet pipe, oil return pipe, and oil drain pipe are inserted into each end of the main shaft 7. Specifically, a first groove and a second groove are further provided on the inner surface of the stator 2. The first groove, the second groove, and the first stator oil drain passage 223 are all grooves provided on the inner surface of the stator 2 and are all grooves along the circumferential direction of the inner surface of the stator 2. Each stator first oil passage 221 communicates with the first groove, and each stator second oil passage 222 communicates with the second groove. The main shaft 7 is provided with a radial first hole, a second hole, and an oil drain hole. When the stator 2 is sleeved on the main shaft 7, the inner surface of the stator 2 fits the outer surface of the main shaft 7. The first hole communicates with the first groove, the second hole communicates with the second groove, and the oil drain hole communicates with the first stator oil drain passage 223. The first hole, the second hole, and the oil drain hole on the main shaft 7 all communicate with the axial through hole of the main shaft 7. The oil inlet pipe, the oil return pipe, and the oil drain pipe pass through the axial through hole of the main shaft 7 and are respectively inserted into the first hole, the second hole, and the oil drain hole. At this time, the external oil supply sequentially passes through the oil inlet pipe, the first hole, and the first groove and enters each stator first oil passage 221.

[0051] Taking a plunger groove 224 and the plunger 5 in this plunger groove 224 as an example, assume that in the initial state, the stator first oil passage 221 corresponding to this plunger groove 224 communicates with the first oil passage 225 of the plunger groove, and the plunger 5 is facing the downward section 1121 of one wave unit. The hydraulic oil in the stator first oil passage 221 sequentially passes through the first oil passage 225 of the plunger groove and the second oil passage 226 of the plunger groove and then enters the plunger groove 224. The oil in the plunger groove 224 overcomes the elastic force of the spring 42 and pushes the plunger 5. At this time, the plunger 5 contacts Figure 3 the downward section 1121 in and moves in a direction away from the central axis of the middle rotor 11. The plunger 5 pushes the middle rotor 11, so that Figure 3The middle rotor 11 therein rotates clockwise, driving the front end cover rotor 12 and the rear end cover rotor 13 to rotate synchronously, and the tire fixedly connected to the rotor rotates synchronously, realizing the driving of the tire. As the rotor continues to rotate, the control valve 3 is pushed by the front end cover rotor 12 or the rear end cover rotor 13, and the passage between the stator first oil passage 221 corresponding to the plunger groove 224 and the plunger groove first oil passage 225 is cut off by the control valve 3. The stator second oil passage 222 is communicated with the plunger groove first oil passage 225. Under the elastic force of the spring 42, the plunger 5 moves back. The oil in the plunger groove 224 sequentially passes through the plunger groove second oil passage 226, the plunger groove first oil passage 225, the stator second oil passage 222, the second groove, and the second hole on the main shaft 7 and then enters the oil return pipe. The process of the oil flowing out of the plunger groove 224 corresponds to the upward section 1122 of the plunger 5 passing through the next wave unit. When the plunger 5 reaches the downward section 1121 of the next wave unit, the stator first oil passage 221 and the plunger groove first oil passage 225 are reconnected, repeating the above process, and the plunger 5 can continuously push the middle rotor 11 to rotate clockwise.

[0052] In the initial state, a part of the plungers 5 face the downward section 1121, and their stator first oil passages 221 and plunger groove first oil passages 225 are communicated; another part of the plungers 5 face the upward section 1122, and their stator second oil passages 222 and plunger groove first oil passages 225 are communicated. At this time, when the stator first oil passage 221 serves as the oil inlet passage, it can push the middle rotor 11 to rotate Figure 3 clockwise therein. If, in the initial state, a part of the plungers 5 face the upward section 1122, and their stator first oil passages 221 and plunger groove first oil passages 225 are communicated; another part of the plungers 5 face the downward section 1121, and their stator second oil passages 222 and plunger groove first oil passages 225 are communicated. At this time, when the stator first oil passage 221 serves as the oil inlet passage, it can push the middle rotor 11 to rotate Figure 4 counterclockwise therein.

[0053] In a specific case, the initial state of the motor is fixed. When it is necessary to drive the middle rotor 11 to rotate in the reverse direction, the flow direction of the hydraulic oil can be changed. That is, the hydraulic oil enters the motor from the oil return pipe and flows out from the oil inlet pipe.

[0054] Finally, it is necessary to state here that the above embodiments are only used to further illustrate the technical solutions of the present invention in detail, and cannot be understood as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention.

Claims

1. A hydraulic drive motor without an oil distributor, characterized in that: It comprises a main shaft (7), a rotor, a stator (2), a plunger (5) and a control valve (3), wherein the stator (2) is fixedly sleeved outside the main shaft (7); The stator (2) comprises an integrally connected stator main body (22) and two stator connecting parts (21) respectively located on both sides of the stator main body (22); a plurality of plunger grooves (224) are provided on the stator main body (22); the plunger grooves (224) are grooves provided on the circumferential outer surface of the stator main body (22); the plurality of plunger grooves (224) are evenly spaced along the circumference of the stator (2); a plunger (5) is movably provided in each plunger groove (224); each plunger groove (224) is equipped with a plunger groove first oil passage (225); the two ends of the plunger groove first oil passage (225) are respectively an inlet and an outlet of hydraulic oil, and the middle part is connected to the plunger groove (224); The vehicle tire is co-rotatingly sleeved outside the rotor, the rotor comprising a middle rotor (11) and two end cover rotors, the two end cover rotors are respectively fixedly connected to the two end faces of the middle rotor (11), the two end cover rotors are respectively sleeved outside two stator connecting parts (21) through bearings, the inner surface (112) of the middle rotor (11) is wavy along the circumferential direction, the plunger (5) contacts the inner surface of the middle rotor (11) under the push of hydraulic oil in the plunger groove (224) and pushes the middle rotor (11) to rotate, and a plurality of wavy guide rails (14) located in the same annular shape are provided on the end face of each end cover rotor facing the other end cover rotor, and the concave and convex tendencies of the guide rails (14) on the two end cover rotors are arranged alternately; The control valve (3) comprises a connecting rod portion (32) and two large heads (31) connected to both ends of the connecting rod portion (32) and thicker than the connecting rod portion (32). The control valve (3) passes through the first oil passage (225) of the plunger groove. The outer diameter of the connecting rod portion (32) is smaller than the aperture of the first oil passage (225) of the plunger groove. The two large heads (31) can be respectively inserted into and close the two ends of the first oil passage (225) of the plunger groove. The two ends of the control valve (3) respectively contact the guide rails (14) on the two end cover rotors. As the rotor rotates, the guide rails (14) on the two end cover rotors push the control valve (3) to move back and forth so that the control valve (3) alternately closes the two ends of the first oil passage (225) of the plunger groove.

2. The hydraulic drive motor according to claim 1, characterized in that: Each plunger groove (224) is also equipped with a stator first oil passage (221), a stator second oil passage (222), and a plunger groove second oil passage (226); an inlet and outlet of the stator first oil passage (221) is arranged on the inner surface of the stator main body (22); the other inlet and outlet is connected to one end of the plunger groove first oil passage (225); the other end of the plunger groove first oil passage (225) is connected to one end of the stator second oil passage (222); the inlet and outlet of the other end of the stator second oil passage (222) are arranged on the inner surface of the stator main body (22); one end of the plunger groove second oil passage (226) is connected to the middle of the plunger groove first oil passage (225); and the other end is connected to the plunger groove (224).

3. The hydraulic drive motor according to claim 2, characterized in that: The first stator oil passage (221) and the second stator oil passage (222) are respectively an oil inlet passage and an oil outlet passage, and both the first stator oil passage (221) and the second stator oil passage (222) are passages arranged in the radial direction of the stator main body (22), and the length direction of the first plunger groove oil passage (225) is parallel to the axial direction of the stator (2).

4. The hydraulic drive motor according to claim 2, characterized in that: A stator oil leakage channel is also provided on the stator main body (22), and the stator oil leakage channel is used to guide and discharge hydraulic oil leaked from the motor. The stator oil leakage channel comprises a first stator oil leakage channel (223) and a second stator oil leakage channel. The first stator oil leakage channel (223) is a groove arranged on the inner surface of the stator (2). The first stator oil leakage channel (223) is arranged along the circumference of the inner surface of the stator (2). One end of the second stator oil leakage channel is connected to the first stator oil leakage channel (223), and the port at the other end is arranged on the circumferential outer surface of the stator main body (22).

5. The hydraulic drive motor according to claim 4, characterized in that: The inner surface of the stator (2) is also provided with a first groove and a second groove. Both the first groove and the second groove are grooves arranged on the inner surface of the stator (2) and are grooves along the circumference of the inner surface of the stator (2). Each stator first oil passage (221) is connected to the first groove, and each stator second oil passage (222) is connected to the second groove. The main shaft (7) is provided with a radial first hole, a second hole and an oil drain hole. When the stator (2) is sleeved on the main shaft (7), the first hole is connected to the first groove, the second hole is connected to the second groove, the oil drain hole is connected to the first stator oil drain passage (223), and the first hole, the second hole and the oil drain hole on the main shaft (7) are connected to the axial through hole of the main shaft (7).

6. The hydraulic drive motor according to claim 5, characterized in that: The external oil drain pipe passes through the axial through hole of the main shaft (7) and is inserted into the oil drain hole, the external oil inlet pipe passes through the axial through hole of the main shaft (7) and is inserted into the first hole or the second hole, and the external oil return pipe passes through the axial through hole of the main shaft (7) and is inserted into the second hole or the first hole.

7. The hydraulic drive motor according to claim 1, characterized in that: The length of the connecting rod portion (32) is equal to the length of the first oil passage (225) of the plunger groove.

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