Hydraulic differential stepless speed change drive axle and vehicle

Abstract

The invention relates to a vehicle driving structure, in particular to a hydraulic differential stepless speed change drive axle. Comprising a power input assembly, a hydraulic base and two driving half bridges which are symmetrically arranged on the hydraulic base and are the same in structure, and each driving half bridge comprises a hydraulic motor assembly, a transmission assembly and a power output assembly. The hydraulic base comprises a base body, a hydraulic channel in the hydraulic base is a circular channel which is formed by drilling and has a smooth and straight inner wall, a hydraulic input port and two hydraulic output ports, and the hydraulic input port and the hydraulic output ports are communicated through the interior of the base body; the power input assembly is connected with the hydraulic input port, the hydraulic motor assembly is connected with the hydraulic output port, and the hydraulic motor assembly is connected with the power output assembly through the transmission assembly. According to the hydraulic differential stepless speed change drive axle adopting the scheme, self-adaptive differential drive is achieved by controlling the hydraulic pressure of a single vehicle.

Description

Technical Field

[0001] The present invention relates to a driving structure and a vehicle, and more particularly to a hydraulic differential continuously variable transmission drive axle and a vehicle equipped with such a drive axle. Background Art

[0002] In the existing continuously variable transmission drive axle, the differential realizes differential turning of the two wheels through a planetary gear set. The differential of this mechanical structure is relatively complex, requires a large number of components in the production, manufacturing and assembly processes, and the assembly process is relatively complex. The differential with a planetary gear set structure is prone to wear.

[0003] Moreover, in a vehicle with a mechanical structure planetary gear set differential, during the turning process, one of the wheels is prone to slip and idle, affecting the normal driving of the vehicle. Summary of the Invention

[0004] The present invention aims to provide a hydraulic differential continuously variable transmission drive axle that realizes the differential function through a hydraulic structure.

[0005] A hydraulic differential continuously variable transmission drive axle in this solution includes a power input component, a hydraulic base, and two drive half axles with the same structure symmetrically arranged on the hydraulic base. The drive half axle includes a hydraulic motor component, a transmission component, and a power output component. The hydraulic base includes a base body, a circular channel with a smooth and straight inner wall formed by drilling in its interior, a hydraulic input port, and two hydraulic output ports. The hydraulic input port and the hydraulic output ports are connected through the circular channel with a smooth and straight inner wall formed by drilling in the base body; the power input component is connected to the hydraulic input port, the hydraulic motor component is connected to the hydraulic output end, and the hydraulic motor component is connected to the power output component through the transmission component.

[0006] The advantages of the present invention are: This solution utilizes the characteristics of hydraulics. When the hydraulic pressure on one side decreases, the hydraulic pressure on the other side naturally increases to achieve differential, eliminating the complex mechanical planetary gear structure in the prior art. By controlling the single vehicle hydraulic pressure, adaptive differential drive is achieved.

[0007] Further, the base body is of an N-shaped structure, the hydraulic input port is arranged at the top of the base body, and the two hydraulic output ports are respectively arranged on the two outer end faces of the base body.

[0008] Further, the hydraulic motor component is connected to the base body through a motor shaft.

[0009] Further, the transmission assembly includes a primary driving gear, a primary driven gear, a secondary driving gear, and a secondary driven gear. The motor shaft penetrates through the side wall of the base body. One end of the motor shaft is outside the base body and is used to connect the hydraulic motor assembly, and the other end is between the two side walls of the base body and is used to fixedly connect the primary driving gear. The primary driving gear meshes with the primary driven gear, the primary driven gear meshes with the secondary driven gear, and the secondary driven gear is connected to one of the power output assemblies.

[0010] Further, the hydraulic motor assembly includes a hydraulic motor and a hydraulic motor swash plate base. The hydraulic motor is sleeved on one of the motor shafts and has an end surface communicating with the hydraulic input port. The end of the motor shaft outside the hydraulic motor is arranged inside the hydraulic motor swash plate base.

[0011] Further, the power input assembly includes an input shaft, a hydraulic pump, and a hydraulic pump displacement flow direction adjustment base. The input shaft is rotatably arranged on the base body. The hydraulic pump and the hydraulic pump displacement flow direction adjustment base are arranged on the input shaft. The hydraulic pump abuts against the hydraulic input port, and the hydraulic pump displacement flow direction adjustment base is arranged on the hydraulic pump.

[0012] Further, the power input assembly is a half shaft. One end of the half shaft is fixedly connected to the central hole of the primary driven gear, and the other end of the half shaft is the power output end.

[0013] Further, the fixed ends of the two half shafts both pass through the central holes of the primary driven gears and are close to each other. External teeth are provided at the fixed ends of the two half shafts. A differential lock is provided on the external teeth of one of the half shafts, and the differential lock can slide on the external teeth of the two half shafts.

[0014] Further, the primary driven gear and the secondary driving gear are concentrically and fixedly arranged. The primary driven gears and the secondary driving gears of the two groups of driving sub-bridges are arranged on the same fixed shaft.

[0015] A vehicle in this solution includes a hydraulic differential continuously variable transmission drive axle as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a hydraulic differential continuously variable transmission drive axle of the present invention;

[0017] Figure 2 is a bottom view of a hydraulic differential continuously variable transmission drive axle of the present invention;

[0018] Figure 3 is a perspective view of a hydraulic base in the present invention;

[0019] Figure 4This is the front view of the hydraulic base in the present invention;

[0020] Figure 5 It is Figure 4 the sectional view taken along A-A in

[0021] Figure 6 It is Figure 4 the sectional view taken along B-B in Specific embodiments

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0023] According to Figures 1 to 6 as shown, a hydraulic differential stepless variable speed drive axle includes a power input component, a hydraulic base 1, and two drive half axles with the same structure symmetrically arranged on the hydraulic base 1. For details, see Figure 3 , the hydraulic base 1 includes a base body 1-1, a hydraulic channel inside the base body 1-1, a hydraulic input port 1-3, and two hydraulic output ports 1-4. The base body 1-1 is of an N-shaped structure. The hydraulic input port 1-3 is arranged at the top of the base body 1-1, and the two hydraulic output ports 1-4 are respectively arranged on the two outer end faces of the base body 1-1. The hydraulic channel inside the base body 1-1 is a circular channel 1-2 formed by drilling with a smooth and straight inner wall.

[0024] For details, see Figures 4 - 6 , the hydraulic input port 1-3 and the hydraulic output port 1-4 are connected through the circular channel 1-2 with a smooth and straight inner wall formed by drilling inside the base body 1-1. The circular channel 1-2 with a smooth and straight inner wall formed by drilling includes a horizontal flow channel 21 and a vertical flow channel 22. The horizontal flow channel 21 is at the horizontal part at the top of the N-shaped structure, and the vertical flow channel 22 is at the two vertical parts on both sides of the N-shaped structure. The hydraulic input port 1-3 is opened at the horizontal flow channel 21, and the hydraulic output port 1-4 is opened at the vertical flow channel 22.

[0025] For details, see Figure 1 , Figure 2 , wherein, the power input component is connected to the hydraulic input port 1-3, the hydraulic motor component is connected to the hydraulic output port 1-4, and the hydraulic motor component is connected to the power output component through a transmission component.

[0026] In this embodiment, the power input component includes an input shaft 9, a hydraulic pump 10, and a hydraulic pump displacement and flow direction adjustment base 11. The input shaft 9 is rotatably arranged on the base body 1-1. The hydraulic pump 10 and the hydraulic pump displacement and flow direction adjustment base 11 are arranged on the input shaft 9. The hydraulic pump 10 is attached to the hydraulic input port 1-3, and the hydraulic pump displacement and flow direction adjustment base 11 is arranged on the hydraulic pump 10.

[0027] The driving half-bridge includes a hydraulic motor assembly, a transmission assembly, and a power output assembly. The hydraulic motor assembly is connected to the base body 1-1 through the motor shaft 2.

[0028] The transmission assembly includes a primary driving gear 3, a primary driven gear 4, a secondary driving gear 5, and a secondary driven gear 6. The motor shaft 2 penetrates through the side wall of the base body 1-1. One end of the motor shaft 2 is outside the base body 1-1 and is used to connect the hydraulic motor assembly, and the other end is between the two side walls of the base body 1-1 and is used to fixedly connect the primary driving gear 3. The primary driving gear 3 meshes with the primary driven gear 4, the primary driven gear 4 meshes with the secondary driven gear 6, and the secondary driven gear 6 is connected to a power output assembly.

[0029] The primary driven gear 4 and the secondary driving gear 5 are two concentrically fixed gears with different outer diameters, which are used for deceleration and torque increase. The primary driven gears 4 and the secondary driving gears 5 of the two driving half-bridges are commonly arranged on the same fixed shaft to keep the speeds on both sides synchronized.

[0030] Specifically, the hydraulic motor assembly includes a hydraulic motor 7 and a hydraulic motor swash plate base 8. The hydraulic motor 7 is sleeved on a motor shaft 2 and has an end face communicating with the hydraulic input port 1-3. The end of the motor shaft 2 outside the hydraulic motor 7 is arranged inside the hydraulic motor swash plate base 8.

[0031] In this embodiment, the power input assembly is a half shaft 12. One end of the half shaft 12 is fixedly connected to the central hole of the primary driven gear 4, and the other end of the half shaft 12 is the power output end.

[0032] As a further improvement of this embodiment, the fixed ends of the two half shafts 12 both pass through the central holes of the primary driven gears 4 and are close to each other. External teeth are provided at the fixed ends of the two half shafts 12. A differential lock 13 is provided on the external teeth of one of the half shafts 12, and the differential lock 13 can slide on the external teeth of the two half shafts 12. A differential lock 13 is arranged between the two half shafts 12 to prevent idling and tire slippage.

[0033] A vehicle includes a hydraulic differential continuously variable transmission driving axle as described above.

[0034] The above are only embodiments of the present invention. Well-known specific structures and characteristics and other common knowledge are not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent.

Claims

1. A hydraulic differential continuously variable transmission drive axle, characterized in that: The invention comprises a power input assembly, a hydraulic base (1) and two drive half-bridges of the same structure symmetrically arranged on the hydraulic base (1), wherein the drive half-bridge comprises a hydraulic motor assembly, a transmission assembly and a power output assembly, wherein the hydraulic base (1) comprises a base body (1-1), a circular channel (1-2) with a smooth and straight inner wall and a hydraulic channel inside the base body (1-1) formed by drilling, a hydraulic input port (1-3) and two hydraulic output ports (1-4); the hydraulic input port (1-3) and the hydraulic output port (1-4) are connected through the circular channel (1-2) with a smooth and straight inner wall and a hydraulic channel inside the base body (1-1); the power input assembly is connected to the hydraulic input port (1-3), the hydraulic motor assembly is connected to the hydraulic output port (1-4), and the hydraulic motor assembly is connected to the power output assembly through the transmission assembly.

2. The hydraulic differential continuously variable transmission drive axle according to claim 1, characterized in that: The base body (1-1) is an N-type structure, the hydraulic input port (1-3) is arranged on the top of the base body (1-1), and the two hydraulic output ports (1-4) are respectively arranged on two outer end surfaces of the base body (1-1).

3. A hydraulic differential continuously variable transmission drive axle according to claim 1 or 2, characterized in that: The hydraulic motor assembly is connected to the base body (1-1) via a motor shaft (2).

4. The hydraulic differential continuously variable transmission drive axle according to claim 3, characterized in that: The transmission assembly comprises a primary driving tooth (3), a primary driven tooth (4), a secondary driving tooth (5) and a secondary driven tooth (6); the motor shaft (2) passes through the side wall of the base body (1-1); one end of the motor shaft (2) is outside the base body (1-1) and is used to connect the hydraulic motor assembly; the other end is between the two side walls of the base body (1-1) and is used to be fixedly connected to the primary driving tooth (3); the primary driving tooth (3) meshes with the primary driven tooth (4); the primary driven tooth (4) meshes with the secondary driven tooth (6); and the secondary driven tooth (6) is connected to the power output assembly.

5. The hydraulic differential continuously variable transmission drive axle according to claim 3, characterized in that: The hydraulic motor assembly comprises a hydraulic motor (7) and a hydraulic motor swash plate base (8); the hydraulic motor (7) is sleeved on a motor shaft (2) and its end face is connected to the hydraulic input port (1-3); the end of the motor shaft (2) outside the hydraulic motor (7) is arranged in the hydraulic motor swash plate base (8).

6. The hydraulic differential continuously variable transmission drive axle according to claim 1, characterized in that: The power input assembly comprises an input shaft (9), a hydraulic pump (10) and a hydraulic pump displacement direction adjustment base (11); the input shaft (9) is rotatably arranged on a base body (1-1); the hydraulic pump (10) and the hydraulic pump displacement direction adjustment base (11) are arranged on the input shaft (9); the hydraulic pump (10) is in contact with the hydraulic input port (1-3); and the hydraulic pump displacement direction adjustment base (11) is arranged on the hydraulic pump (10).

7. The hydraulic differential continuously variable transmission drive axle according to claim 3, characterized in that: The power input component is a half shaft (12), one end of the half shaft (12) is fixedly connected to the center hole of the primary driven gear (4), and the other end of the half shaft (12) is a power output end.

8. The hydraulic differential continuously variable transmission drive axle according to claim 7, characterized in that: The fixed ends of the two half-shafts (12) pass through the central hole of the primary driven gear (4) and are close to each other. The fixed ends of the two half-shafts (12) are provided with external teeth, and a differential lock (13) is provided on the external teeth of one of the half-shafts (12). The differential lock (13) can slide on the external teeth of the two half-shafts (12).

9. The hydraulic differential continuously variable transmission drive axle according to claim 3, characterized in that: The primary driven teeth (4) and the secondary driving teeth (5) are coaxially fixedly arranged, and the primary driven teeth (4) and the secondary driving teeth (5) of the two sets of driving sub-bridges are arranged on the same fixed shaft.

10. A vehicle, characterized in that: It comprises a hydraulic differential continuously variable drive axle as claimed in any one of claims 1 to 9.

Images