Hydraulic drive axle of vehicle

Abstract

The utility model discloses a hydraulic drive axle of a vehicle, which comprises a combined axle shaft, a motor, hubs, a steel ring, a tire, a connecting flange and hub bearings, two ends of a hollow shaft of the combined axle shaft are respectively connected with the hubs through the hub bearings, the hubs, the steel ring and the connecting flange are fixedly connected, the tire is sleeved on the steel ring, the inner surface of a guide rail of the motor is a curved surface, and 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 ends of the guide rail respectively, the guide rail and the connecting flange are relatively fixed, the oil distribution shaft, the stator and the guide rail are sequentially connected in a sleeved mode from inside to outside, the stator is fixedly connected with the oil distribution disc assembly and the hollow shaft, the oil distribution shaft is fixedly connected with the rear end cover rotor, and a plurality of plunger grooves in the outer surface of the stator are each 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. The motor shell is driven by hydraulic oil to rotate forwards and backwards, wheels are driven to move forwards and backwards, the torque is adjustable, the bearing capacity is large, operation is flexible, slow driving can be achieved, and the device is suitable for carrying of equipment under severe road conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering vehicle drive axles, in particular to a hydraulic drive axle of a vehicle. Background Art

[0002] In the engineering and technical fields such as wind power installation, mines, factory areas, port terminals, special environment work areas, etc., the construction site is generally located in mountainous areas and other places with very bad road and traffic conditions. The equipment required at the construction site is often relatively large, such as wind turbine blades. This puts higher requirements on the transportation engineering vehicles, requiring the engineering vehicles to have strong climbing ability and off-road ability and safer downhill ability. In the prior art, the above-mentioned engineering transportation vehicles still have many defects, such as the drive motor and the drive axle shaft jointly bear the weight, resulting in problems such as short service life and easy damage of the drive motor; due to the rugged mountain roads and the operation of the drive axle shaft, the drive motor cannot be stably supported, affecting its safety. For another example, there are many steep slopes on mountain roads. When going downhill, vehicles often need to brake continuously to make the vehicles go down safely. However, due to the large tonnage of engineering vehicles, continuous braking will seriously affect the brake life. At present, fire accidents caused by friction heat due to the current braking mode occur from time to time. 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 axle of a vehicle, which drives the motor guide rail to rotate forward and reversely through hydraulic oil, thereby realizing forward and backward driving of the wheels, and the vehicle body power torque is adjusted by adjusting the pressure of the hydraulic oil. The vehicle speed is flexibly adjusted, the load-bearing capacity is large, the operation is flexible and maneuverable, and slow driving can be achieved, thereby improving the safety factor of the vehicle and the service life of the brakes. It is suitable for the transportation of medium and large equipment in areas with harsh road conditions. The weight of the motor is borne by the steel rim instead of the combined axle shaft, and the motor support and operation are more stable, making the drive smoother.

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

[0005] A hydraulic drive axle of a vehicle comprises a combined axle shaft, a motor, a wheel hub, a steel rim, a tire, a connecting flange and a wheel hub bearing. The combined axle shaft comprises a hollow shaft with a long rod-shaped structure with a hollow interior. Both ends of the hollow shaft are connected to the wheel hub through wheel hub bearings. The wheel hub, the steel rim and the connecting flange are fixedly connected. The tire is sleeved on the steel rim. The motor comprises a guide rail, a front cover rotor, a rear 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 cover rotor and the rear cover rotor are respectively fixedly connected to the two end faces of the guide rail. The guide rail and the connecting flange are relatively fixed. The oil distribution shaft, the stator and the guide rail are sleeved in sequence from the inside to the outside. One end of the stator is connected to the rear cover rotor through a second bearing, the middle part of the stator is connected to the front cover rotor through a bearing, the other end of the stator passes through the front cover rotor and is fixedly connected to the oil distribution plate assembly. The disc assembly is connected to the hollow shaft, one end of the oil distribution shaft is connected to the oil distribution disc 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 in a circumferential direction, and a plunger is arranged in each plunger groove. An oil distribution shaft oil inlet channel and an oil distribution shaft oil outlet channel for the hydraulic oil to flow through are provided on the oil distribution shaft. As the oil distribution shaft and the guide rail rotate, the plunger groove is alternately connected to the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel, and the external oil pipe is inserted into the hollow shaft and connected to the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel. As the oil distribution shaft and the guide rail rotate, the plunger groove is alternately connected to the oil distribution shaft oil inlet channel and the oil distribution shaft oil outlet channel, so that the external hydraulic oil enters the plunger groove through the hollow shaft and the oil distribution shaft oil inlet channel and pushes the plunger. The plunger pushes the inner surface of the guide rail to rotate the guide rail, or the hydraulic oil in the plunger groove flows out through the oil distribution shaft oil outlet channel and the hollow shaft, and the plunger falls back so as not to hinder the rotation of the guide rail.

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

[0007] 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 oil inlet pipe in the hollow shaft. 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 oil return pipe in the hollow shaft.

[0008] The oil distribution shaft is also provided with an oil inlet groove and an oil outlet groove, the oil inlet 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 inlet channel, the oil inlet groove and the oil distribution shaft oil inlet channel are connected in sequence, and the 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 the 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 groove is 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] 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 is alternately connected 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 is alternately connected to the oil distribution shaft oil outlet channel and is closed by the outer surface of the oil distribution shaft.

[0010] The stator is also provided with a stator oil leakage channel, one end of which is connected to the inner surface of the stator, and the other end of which is connected to the oil leakage pipe in the hollow shaft.

[0011] 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 an upward section.

[0012] When the plunger groove is connected to the oil inlet passage of the oil distribution shaft, the plunger position in the plunger groove corresponds to the downward section of a wave unit on the inner surface; when the plunger groove is connected to the oil outlet passage of the oil distribution shaft, the plunger position in the plunger groove corresponds to the upward section of a wave unit on the inner surface.

[0013] The hydraulic drive axle of the vehicle also includes a brake hub and a brake shoe bracket, and the brake hub and the brake shoe bracket are both fixedly connected to the steel ring.

[0014] There is a motor, two steel rims and two tires at each end of the hollow shaft. A tire is connected to the outer shell of each steel rim. The two steel rims are connected to the wheel hub coaxially. The two steel rims are arranged axially along the hollow shaft. The connecting flange and the motor are located in the inner ring of one steel rim, and the wheel hub is located in the inner ring of the other steel rim.

[0015] The beneficial effects of the utility model are:

[0016] (1) By changing the flow direction of the hydraulic oil, the guide rail of the motor is driven in the forward and reverse directions, thereby realizing the forward and reverse drive of the wheels.

[0017] (2) The vehicle power torque can be adjusted by adjusting the pressure of the hydraulic oil. The vehicle speed can be adjusted flexibly, and a larger driving torque can be achieved. It has a large load capacity and is flexible and maneuverable in operation. It overcomes the shortcoming of existing vehicles that only slow down by stepping on the brakes. It can achieve slow-speed driving and speed reduction by reducing the pressure of the hydraulic oil. It can be used as an additional brake for heavy vehicles to increase braking efficiency, improve the vehicle's safety factor and the service life of the brakes. It is suitable for the transportation of medium and large equipment in areas with harsh road conditions such as factories, mines, ports and docks, and mountainous areas, and can achieve overload and super-heavy load transportation.

[0018] (3) The weight of the motor is borne by the steel ring instead of the combined axle shaft, so the motor is supported and runs more smoothly, making the drive smoother.

[0019] (4) The hollow design of the hollow shaft facilitates the layout of the oil channel, making the overall structure more compact, and the oil pipe is not exposed, which is more conducive to safe driving.

[0020] (5) Driven by hydraulic oil, it is easy to automate and intelligently set up other controls of the vehicle body.

[0021] (6) Driven by hydraulic oil, it is beneficial to energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a structural schematic diagram of a motor according to an embodiment of the utility model.

[0024] Figure 3 It is a schematic structural diagram of a guide rail of a motor according to an embodiment of the utility model.

[0025] Figure 4 It is a schematic diagram of the wave unit structure of a guide rail in one embodiment of the utility model.

[0026] Figure 5 It is a schematic diagram of the coordination between the stator and the oil distribution shaft of a motor according to an embodiment of the utility model. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] A hydraulic drive axle of a vehicle, such as Figures 1 to 5 As shown, it includes a combined bridge shaft 1, a motor 2, a wheel hub 3, a steel rim 4, a tire 5, a connecting flange 6, a wheel hub bearing 7, a brake hub 8, and a brake shoe bracket 9.

[0030] The combined axle 1 includes a hollow shaft 11, which is a long rod-shaped structure with a hollow interior. The two ends of the combined axle 1 are connected to the tire 5 and the motor 2. Specifically, each end of the hollow shaft 11 is connected to a motor 2 and at least one tire 5.

[0031] In this embodiment, each end of the hollow shaft 11 is connected to a motor 2 and two tires 5 .

[0032] Each end of the hollow shaft 11 is connected to the motor 2 and the tire 5 through the wheel hub 3. The wheel hub 3 is sleeved on the outside of the hollow shaft 11 through two wheel hub bearings 7. The two wheel hub bearings 7 are arranged on the hollow shaft 11 in parallel and spaced apart. The two ends of the wheel hub 3 are respectively sleeved on the outer rings of the two wheel hub bearings 7. In this way, the wheel hub 3 is rotatably mounted on the hollow shaft 11. Preferably, a shoulder for limiting the wheel hub bearing 7 is provided on the hollow shaft 11, and one end face of one wheel hub bearing 7 contacts the shoulder position and the other end face contacts the limiting protrusion of the wheel hub 3; one end face of the other wheel hub bearing 7 contacts another limiting protrusion of the wheel hub 3 and the other end face contacts the motor 2, thereby realizing the axial limiting of the two wheel hub bearings 7 and the wheel hub 3 in the hollow shaft 11. Obviously, there are two wheel hubs 3, and each of the two ends of the hollow shaft 11 is provided with a wheel hub 3.

[0033] The steel ring 4 is annular, and the steel ring 4 and the hollow shaft 11 are arranged on the same center line. The steel ring 4 is fixedly connected to the wheel hub 3. Preferably, the inner diameter of the steel ring 4 is larger than the outer diameter of the connecting flange 6. The tire 5 is sleeved outside the steel ring 4.

[0034] The connecting flange 6 is annular, and the connecting flange 6 and the hollow shaft 11 are arranged on the same center line. The connecting flange 6 is fixedly connected to the steel ring 4. Preferably, the connecting flange 6 is located on the side of one hub 3 away from the other hub 3. The motor 2 and the hollow shaft 11 are on the same center line. The motor 2 is fixedly connected to the connecting flange 6 and connected to one end of the hollow shaft 11. Preferably, the diameter of the connecting flange 6 is larger than the outer diameter of the hollow shaft 11 and the outer diameter of the hub 3, and the motor 2 is located in the inner circle of the connecting flange 6.

[0035] In this embodiment, each end of the hollow shaft 11 has two steel rings 4 and two tires 5, and each steel ring 4 is outer-mounted with a tire 5. The two steel rings 4 are connected to the wheel hub 3 with a common center line, and the two steel rings 4 are arranged axially along the hollow shaft 11. The connecting flange 6 and the motor 2 are located in the inner ring of one steel ring 4, and the wheel hub 3 is located in the inner ring of the other steel ring 4. In this way, the axial space of the drive axle shaft is fully utilized, making the overall structure more compact.

[0036] Based on the above structure, the connecting flange 6 and the wheel hub 3 are both fixedly connected to the steel ring 4 , and the motor 2 is connected to the steel ring 4 via the connecting flange 6 , that is, the motor 2 is supported by the steel ring 4 .

[0037] The brake hub 8 and the brake shoe bracket 9 are both fixedly connected to the steel ring 4. Preferably, the brake hub 8 and the brake shoe bracket 9 are both connected to the wheel hub 3 and are located in the inner ring of the steel ring 4 where the wheel hub 3 is located.

[0038] Motor 2 is a hydraulic motor. Figure 2 As shown, the motor 2 includes a guide rail 21 , a front cover rotor 22 , a rear cover rotor 23 , a stator 24 , an oil distribution plate assembly 25 , an oil distribution shaft 26 , and a plunger 27 .

[0039] Guide rail 21 Figure 2 and 3 As shown, the guide rail 21 is a cylindrical structure, that is, the guide rail 21 is hollow, and the guide rail 21 has an outer surface 211, an inner surface 212 and two end surfaces. The outer surface 211 of the guide rail 21 is a cylindrical outer surface. The inner surface 212 of the guide rail 21 is a curved surface. Specifically, in a plane perpendicular to the axial direction of the cylindrical structure, the inner surface 212 of the guide rail 21 is wavy, and the wavy shape is formed by connecting multiple wavy units end to end in sequence. An object fits the inner surface 212 of the guide rail 21 along Figure 3 The guide rail 21 moves clockwise around the circumference, and 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 21, and this section of the distance of the wave unit is assumed to be the downward section 2121; the object will then gradually move away from the center line of the guide rail 21, and this section of the distance of the wave unit is assumed to be the upward section 2122.

[0040] The front cover rotor 22 and the rear cover rotor 23 are respectively fixedly connected to the two end surfaces of the guide rail 21, and the front cover rotor 22 and the rear cover rotor 23 are fixedly connected to the guide rail 21 by bolts. The front cover rotor 22, the rear cover rotor 23 and the guide rail 21 are connected to form the outer shell or housing of the motor 2. The housing has an internal cavity, that is, the front cover rotor 22, the rear cover rotor 23 and the guide rail 21 have an enclosed space. The housing of the motor 2 is fixedly connected to the connecting flange 6.

[0041] like Figure 2 and Figure 5As shown, the stator 24 has a central through hole, and the through hole is cylindrical in shape. The stator 24 includes an outer surface, an inner surface and two end surfaces. The outer surface of the stator 24 can be regarded as a rotating surface, and its specific shape can be flexibly designed. The inner surface of the stator 24 is a cylindrical surface, and this cylindrical surface is the wall surface of the central through hole of the stator 24. The stator 24 passes through the inner cavity of the guide rail 21, and the center line of the through hole of the stator 24 coincides with the center line of the guide rail 21. One end of the stator 24 is connected to the rear end cover rotor 23 through the second bearing 29, and the middle part of the stator 24 is connected to the front end cover rotor 22 through a bearing. The other end of the stator 24 passes through the front end cover rotor 22 and is fixedly connected to the oil distribution plate assembly 25. There is a gap between the outer surface of one end of the stator 24 extending into the internal cavity of the shell and the inner surface of the shell.

[0042] The stator 24 is provided with a stator oil inlet passage 241, a stator oil outlet passage 242, a stator oil drain passage 243, a plunger groove oil inlet passage 245, a plunger groove oil return passage 246 and a plunger groove 244. The plunger groove 244 is a groove provided on the outer surface of the stator 24, and a plurality of plunger grooves 244 are provided, and the plurality of plunger grooves 244 are evenly spaced along the circumference of the stator 24. Preferably, the number of the plunger grooves 244 is the same as the number of the wave units.

[0043] There are multiple plungers 27, and the multiple plungers 27 are respectively located in multiple plunger grooves 244. The plunger 27 is equivalent to a piston, which is placed in the plunger groove 244 without being fixedly connected. The plunger 27 fits the circumferential wall surface of the plunger groove 244, so that the plunger 27 and the bottom surface of the plunger groove 244 form a volume space. Preferably, the plunger 27 is spherical. During operation, the plunger 27 keeps in contact with the inner surface 212 of the guide rail 21 under the pressure of the hydraulic oil.

[0044] The stator oil inlet passage 241, the stator oil outlet passage 242, the stator oil drain passage 243, the plunger slot oil inlet passage 245 and the plunger slot oil return passage 246 are all through-hole passages provided on the stator 24. The inlet of the stator oil inlet passage 241 is on one end surface of the stator 24 connected to the oil distribution plate assembly 25, and the outlet is on the inner surface of the stator 24; the inlet of the stator oil outlet passage 242 is on the inner surface of the stator 24, and the outlet is on one end surface of the stator 24 connected to the oil distribution plate assembly 25; the inlet of the plunger slot oil inlet passage 245 is on the inner surface of the stator 24, and the outlet is on the bottom surface of the plunger slot 244; the inlet of the plunger slot oil return passage 246 is on the bottom surface of the plunger slot 244, and the outlet is on the inner surface of the stator 24; the inlet of the stator oil drain passage 243 is on the inner surface of the stator 24, and the outlet is on one end surface of the stator 24 connected to the oil distribution plate assembly 25. Preferably, one stator oil inlet passage 241 is provided, one stator oil drain passage 243 is provided, one stator oil outlet passage 242 is provided, multiple plunger groove oil return passages 246 are provided, and multiple plunger groove oil inlet passages 245 are provided, and each plunger groove 244 is connected to one plunger groove oil return passage 246 and one plunger groove oil inlet passage 245. Preferably, both the stator oil inlet passage 241 and the stator oil outlet passage 242 are L-shaped.

[0045] like Figure 5 As shown, the oil distribution shaft 26 is a cylinder, and the outer diameter of the oil distribution shaft 26 is equal to the diameter of the middle through hole of the stator 24. The oil distribution shaft 26 is sleeved in the middle through hole of the stator 24, and the outer surface of the oil distribution shaft 26 fits the hole wall of the through hole of the stator 24. The oil distribution shaft 26 and the middle through hole of the stator 24 share the same center line. Figure 2 As shown, one end of the oil distribution shaft 26 is connected to the oil distribution plate assembly 25 via a first bearing 28, and the other end is fixedly connected to the rear end cover rotor 23 via bolts or the like. The first bearing 28 is a thrust ball bearing.

[0046] The oil distribution shaft 26 is provided with an oil inlet groove 261, an oil outlet groove 264, an oil distribution shaft oil inlet passage 262 and an oil distribution shaft oil outlet passage 263. The oil inlet groove 261 is an annular groove formed on the outer surface of the oil distribution shaft 26 along the circumference of the oil distribution shaft 26, and the oil inlet groove 261 is connected to the outlet of the stator oil inlet passage 241. The oil outlet groove 264 is an annular groove formed on the outer surface of the oil distribution shaft 26 along the circumference of the oil distribution shaft 26, and the oil outlet groove 264 is connected to the inlet of the stator oil outlet passage 242. The oil distribution shaft oil inlet passage 262 and the oil distribution shaft oil outlet passage 263 are both through-hole passages on the oil distribution shaft 26. The inlet of the oil distribution shaft oil inlet passage 262 is connected to the oil inlet groove 261, and the outlet is provided on the outer surface of the oil distribution shaft 26; the inlet of the oil distribution shaft oil outlet passage 263 is provided on the outer surface of the oil distribution shaft 26, and the outlet is connected to the oil outlet groove 264. There are multiple oil distribution shaft oil inlet passages 262 and oil distribution shaft oil outlet passages 263. The oil inlet grooves 261 and the oil outlet grooves 264 are arranged at intervals along the axial direction of the oil distribution shaft 26. Preferably, the oil inlet grooves 261 are closer to the oil distribution plate assembly 25 than the oil outlet grooves 264.

[0047] Based on the above structure, during operation, the stator 24 and the oil distribution plate assembly 25 are fixed, and the oil distribution shaft 26 and the housing of the motor 2 (the front cover rotor 22, the rear cover rotor 23 and the guide rail 21) can rotate relative to the stator 24 as a whole, and can rotate until the outlet of the oil distribution shaft oil inlet passage 262 is connected to the inlet of the plunger groove oil inlet passage 245, and the inlet of the oil distribution shaft oil outlet passage 263 is connected to the outlet of the plunger groove oil return passage 246. For the plunger groove oil inlet passage 245 and the plunger groove oil return passage 246 connected to the same plunger groove 244, the plunger groove oil inlet passage 245 and the plunger groove oil return passage 246 are not connected to the oil passage on the oil distribution shaft 26 at the same time. In other words, for the same plunger groove 244, when the plunger groove oil inlet channel 245 and the oil distribution shaft oil inlet channel 262 are connected, the plunger groove oil return channel 246 and the oil distribution shaft oil outlet channel 263 are not connected; when the plunger groove oil return channel 246 and the oil distribution shaft oil outlet channel 263 are connected, the plunger groove oil inlet channel 245 and the oil distribution shaft oil inlet channel 262 are not connected.

[0048] Furthermore, make the following settings: Figure 3 In the view shown in , when a plunger groove oil inlet channel 245 and an oil distribution shaft oil inlet channel 262 are connected, the position of the plunger 27 in the plunger groove 244 connected to the plunger groove oil inlet channel 245 corresponds to the downward section 2121 of one of the wave units on the inner surface 212; when a plunger groove oil return channel 246 and an oil distribution shaft oil outlet channel 263 are connected, the position of the plunger 27 in the plunger groove 244 connected to the plunger groove oil return channel 246 corresponds to the upward section 2122 of one of the wave units on the inner surface 212.

[0049] The combined axle shaft 1 is fixedly connected to the oil distribution plate assembly 25 , and specifically, the hollow shaft 11 is fixedly connected to the oil distribution plate assembly 25 . The housing of the motor 2 is connected in the steel ring 4 .

[0050] Based on the above structure, the working principle and working process of the utility model are as follows: the oil inlet pipe 111, the oil return pipe 112 and the oil drain pipe 113 are inserted from the middle of the hollow shaft 11 toward each end of the hollow shaft 11, and the oil inlet pipe 111, the oil return pipe 112 and the oil drain pipe 113 pass through the hollow shaft 11, pass through the oil distribution plate assembly 25 and enter the stator 24, the oil inlet pipe 111 is connected to the stator oil inlet passage 241, the oil return pipe 112 is connected to the stator oil outlet passage 242, and the oil drain pipe 113 is connected to the stator oil drain passage 243. An external oil pump or the like provides oil pressure, and the external oil passes through the stator oil inlet passage 241, the oil inlet groove 261, and the oil distribution shaft oil inlet passage 262 in sequence through the oil inlet pipe 111.

[0051] Take a plunger groove 244 and a plunger 27 in the plunger groove 244 as an example. When the plunger groove oil inlet passage 245 connected to the plunger groove 244 is connected to an oil distribution shaft oil inlet passage 262 (such as Figure 5The plunger groove 244 at the lower middle part is connected to the plunger groove 244. At this time, the plunger groove return oil passage 246 connected to the plunger groove 244 is not connected to the oil distribution shaft oil outlet passage 263. The outlet of the plunger groove return oil passage 246 is closed by the outer surface of the oil distribution shaft 26, and the inlet of the oil distribution shaft oil outlet passage 263 is closed by the inner surface of the stator 24. The oil in the oil distribution shaft oil inlet passage 262 enters the plunger groove oil inlet passage 245 under pressure, and then enters the plunger groove 244. The oil in the plunger groove 244 pushes the plunger 27. At this time, the plunger 27 contacts Figure 3 The downward section 2121 in the oil distribution shaft 26 moves in a direction away from the center line of the oil distribution shaft 26, and the plunger 27 pushes the guide rail 21 to Figure 3 The guide rail 21 in the stator 24 rotates clockwise, and the guide rail 21 drives the front cover rotor 22, the rear cover rotor 23, and the oil distribution shaft 26 to rotate synchronously, and the connecting flange 6, the steel ring 4 and the tire 5 rotate synchronously to realize the driving of the tire 5. As the oil distribution shaft 26 continues to rotate, the oil distribution shaft oil inlet passage 262 connected to the plunger groove 244 will be turned open, the inlet of the plunger groove oil inlet passage 245 will be closed by the outer surface of the oil distribution shaft 26, and the outlet of the oil distribution shaft oil inlet passage 262 will be closed by the inner surface of the stator 24. At the same time, the guide rail 21 rotates to the upper section 2122 to contact the plunger 27, and the plunger groove oil return passage 246 connected to the plunger groove 244 is connected to the oil distribution shaft oil outlet passage 263 (see FIG. Figure 5 The plunger groove 244 at the upper middle part corresponds to the plunger groove oil return passage 246), the oil in the plunger groove 244 flows into the plunger groove oil return passage 246, then enters the oil distribution shaft oil outlet passage 263, and finally flows out of the return oil pipe 112 through the oil outlet groove 264 and the stator oil outlet passage 242. As the oil distribution shaft 26 continues to rotate, the entrance of the oil distribution shaft oil outlet passage 263 is turned open, and the outlet of the oil distribution shaft oil outlet passage 263 corresponding to this plunger groove 244 will be closed by the outer surface of the oil distribution shaft 26, and the oil distribution shaft 26 and the guide rail 21 rotate as a whole until the plunger 27 contacts the next descending section 2121 of the wave unit, and at the same time, the plunger groove oil inlet passage 245 is connected to the next oil distribution shaft oil inlet passage 262, and the above process is repeated. During design, a portion of the plungers 27 initially contacts the downward segment 2121, and a portion of the plungers 27 contacts the upward segment 2122. During operation, a portion of the plungers 27 always contacts the downward segment 2121 to push the guide rail 21. Multiple plungers 27 push the tire 5 to rotate continuously through the above process.

[0052] The oil leaked between the stator 24 and the oil distribution shaft 26 is discharged through the stator oil drain channel 243. The outer surface of the oil inlet groove 261 is sealed by the inner surface of the stator 24 except that it is connected to the stator oil inlet channel 241; similarly, the outer surface of the oil outlet groove 264 is sealed by the inner surface of the stator 24 except that it is connected to the stator oil outlet channel 242. In order to reduce oil leakage, oil seals are provided between the oil inlet groove 261, the oil outlet groove 264 and the inner surface of the stator 24.

[0053] The number of the oil distribution shaft oil inlet passages 262 , the number of the oil distribution shaft oil outlet passages 263 , and the number of the plunger grooves 244 are the same or different, and their specific numbers can be flexibly set.

[0054] When the guide rail 21 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 2 from the oil return pipe 112 and flows out from the oil inlet pipe 111 .

[0055] 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 axle of a vehicle, characterized in that: The invention comprises a combined bridge shaft (1), a motor (2), a wheel hub (3), a steel rim (4), a tire (5), a connecting flange (6), and a wheel hub bearing (7). The combined bridge shaft (1) comprises a hollow shaft (11) with a long rod-shaped structure inside. Both ends of the hollow shaft (11) are connected to the wheel hub (3) through the wheel hub bearing (7). The wheel hub (3), the steel rim (4), and the connecting flange (6) are fixedly connected. The tire (5) is sleeved on the steel rim (4). The motor (2) comprises a guide rail (21), a front end cover rotor (2 2), a rear end cover rotor (23), a stator (24), an oil distribution plate assembly (25), an oil distribution shaft (26) and a plunger (27), the guide rail (21) is a cylindrical structure with a curved inner surface, the front end cover rotor (22) and the rear end cover rotor (23) are respectively fixedly connected to the two end surfaces of the guide rail (21), the guide rail (21) and the connecting flange (6) are relatively fixed, the oil distribution shaft (26), the stator (24) and the guide rail (21) are sleeved in sequence from the inside to the outside, one end of the stator (24) and the rear end cover rotor (23) is connected through a second bearing (29), a middle portion of the stator (24) is connected to the front cover rotor (22) through a bearing, the other end of the stator (24) passes through the front cover rotor (22) and is fixedly connected to the oil distribution plate assembly (25), the oil distribution plate assembly (25) is connected to the hollow shaft (11), one end of the oil distribution shaft (26) is connected to the oil distribution plate assembly (25) through a first bearing (28), and the other end is fixedly connected to the rear cover rotor (23), and the outer surface of the stator (24) is provided with a plurality of A plunger groove (244) is provided, each plunger groove (244) has a plunger (27), an oil distribution shaft oil inlet passage (262) and an oil distribution shaft oil outlet passage (263) for hydraulic oil to flow through are provided on the oil distribution shaft (26), as the oil distribution shaft (26) and the guide rail (21) rotate, the plunger groove (244) is alternately connected to the oil distribution shaft oil inlet passage (262) and the oil distribution shaft oil outlet passage (263), and an external oil pipe is inserted into the hollow shaft (11) to connect the oil distribution shaft oil inlet passage (262) and the oil distribution shaft oil outlet passage (263).

2. The hydraulic drive axle according to claim 1, characterized in that: The stator (24) is provided with a stator oil inlet passage (241) and a stator oil outlet passage (242); one end of the stator oil inlet passage (241) is connected to an oil distribution shaft oil inlet passage (262), and the other end is connected to an oil inlet pipe (111) in the hollow shaft (11); one end of the stator oil outlet passage (242) is connected to an oil distribution shaft oil outlet passage (263), and the other end is connected to an oil return pipe (112) in the hollow shaft (11).

3. The hydraulic drive axle according to claim 2, characterized in that: The oil distribution shaft (26) is also provided with an oil inlet groove (261) and an oil outlet groove (264). The oil inlet groove (261) is an annular groove formed on the outer surface of the oil distribution shaft (26) along the circumference of the oil distribution shaft (26). The stator oil inlet passage (241), the oil inlet groove (261) and the oil distribution shaft oil inlet passage (262) are connected in sequence. The end of the oil distribution shaft oil inlet passage (262) away from the oil inlet groove (261) is alternately connected to each plunger groove (244) as the oil distribution shaft (26) rotates. The oil outlet groove (264) is an annular groove formed on the outer surface of the oil distribution shaft (26) along the circumference of the oil distribution shaft (26). An annular groove is provided in a circle, and the stator oil outlet passage (242), the oil outlet groove (264) and the oil distribution shaft oil outlet passage (263) are connected in sequence. The end of the oil distribution shaft oil outlet passage (263) away from the oil outlet groove (264) is alternately connected with each plunger groove (244) as the oil distribution shaft (26) rotates. The plunger groove (244) is not connected with the oil distribution shaft oil inlet passage (262) and the oil distribution shaft oil outlet passage (263) at the same time. The oil distribution shaft oil inlet passage (262) and the oil distribution shaft oil outlet passage (263) are each provided with at least one, and the outer surface of the oil distribution shaft (26) and the inner surface of the stator (24) are in contact with each other.

4. The hydraulic drive axle according to claim 3, characterized in that: The stator (24) is also provided with a plunger groove oil inlet passage (245) and a plunger groove oil return passage (246). One end of the plunger groove oil inlet passage (245) is connected to the plunger groove (244), and the port at the other end is on the inner surface of the stator (24). One end of the plunger groove oil return passage (246) is connected to the plunger groove (244), and the port at the other end is on the inner surface of the stator (24). As the oil distribution shaft (26) rotates, the port of the plunger groove oil inlet passage (245) on the inner surface of the stator (24) is alternately connected to the oil distribution shaft oil inlet passage (262) and is closed by the outer surface of the oil distribution shaft (26), and the port of the plunger groove oil return passage (246) on the inner surface of the stator (24) is alternately connected to the oil distribution shaft oil outlet passage (263) and is closed by the outer surface of the oil distribution shaft (26).

5. The hydraulic drive axle according to claim 2, characterized in that: The stator (24) is also provided with a stator oil leakage passage (243), one end of which is connected to the inner surface of the stator (24) and the other end of which is connected to the oil leakage pipe (113) in the hollow shaft (11).

6. The hydraulic drive axle according to any one of claims 1 to 5, characterized in that: In a plane perpendicular to the axial direction of the guide rail (21), the inner surface (212) of the guide rail (21) 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 (2121) and an upward section (2122).

7. The hydraulic drive axle according to claim 6, characterized in that: When the plunger groove (244) is connected to the oil inlet passage (262) of the oil distribution shaft, the position of the plunger (27) in the plunger groove (244) corresponds to a downward section (2121) of a wave unit on the inner surface (212); when the plunger groove (244) is connected to the oil outlet passage (263) of the oil distribution shaft, the position of the plunger (27) in the plunger groove (244) corresponds to an upward section (2122) of a wave unit on the inner surface (212).

8. The hydraulic drive axle according to claim 1, characterized in that: Each end of the hollow shaft (11) is provided with a motor (2), two steel rims (4) and two tires (5). A tire (5) is connected to the outer surface of each steel rim (4). The two steel rims (4) are connected to the wheel hub (3) coaxially. The two steel rims (4) are arranged axially along the hollow shaft (11). The connecting flange (6) and the motor (2) are located in the inner ring of one steel rim (4), and the wheel hub (3) is located in the inner ring of the other steel rim (4).

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