A hydrostatic stepless transmission device

Abstract

The utility model provides a kind of static hydraulic stepless speed changer, belong to speed changer technical field.It solves the motor swash plate peripheral wear and tear and other technical problems of existing speed changer.This static hydraulic stepless speed changer, including fixedly connected shell and shell cover, shell and shell cover between being provided with pump assembly and motor assembly, motor assembly and shell between being provided with motor swash plate, the upper end surface of motor swash plate is horizontal plane lower end surface is inclined surface, shell is provided with motor cavity, the upper end surface of motor swash plate and the top wall of motor cavity abut and are fixed by at least two cylindrical pin, the upper end of motor swash plate and shell form a fixed groove jointly, bearing one is fixedly arranged in fixed groove, motor main shaft is connected in bearing one, the side of motor swash plate is the free surface of no contact, the lower end surface of motor swash plate is fixedly connected with motor thrust plate.The utility model improves the service life of motor swash plate and motor thrust plate, improves the reliability of whole machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of speed change devices, specifically referring to a hydrostatic continuously variable transmission device. Background Technology

[0002] The hydraulic continuously variable transmission (CVT) integrates a bidirectional variable pump, a fixed displacement motor, and a replenishing pump control valve. The working fluid discharged from the replenishing pump, after fine filtration, flows to the low-pressure side of the main oil circuit of the variable pump, replenishing it and providing back pressure. The inlet and outlet of the variable pump and the fixed displacement motor are connected by cast internal oil passages, forming a closed system. By operating the lever, the flow rate and direction of the variable pump are controlled, thereby changing the speed and direction of the motor, transferring energy between the engine and the traveling mechanism in a continuous rotational manner.

[0003] Currently, a hydrostatic continuously variable transmission (CVT) device, such as patent number 2018110577526, has a motor swashplate and a motor return plate sequentially arranged between the inner wall of the housing and the motor cylinder. Between the motor cylinder and the motor shaft, a motor ball joint, a motor needle roller, and a motor spring are sequentially arranged. The motor spring presses the motor ball joint against the motor return plate via the motor needle roller. A motor slipper is provided between the motor swashplate and the motor return plate, and the motor return plate presses the head of the motor slipper against the motor swashplate. When the motor shaft rotates, the head of the motor slipper slides against the motor swashplate. However, this structure has a flaw in the way the motor swashplate is fixed. The motor swashplate is fixed at an angle inside the motor cylinder, and the rotational thrust of the motor slipper on the motor swashplate causes friction between the motor swashplate and the motor cylinder, leading to wear on the outer circumference of the motor swashplate, thus reducing the overall lifespan and reliability of the device. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydrostatic continuously variable transmission device.

[0005] The objective of this utility model can be achieved through the following technical solution: A hydrostatic continuously variable transmission device includes a housing and a cover fixedly connected together. A pump assembly and a motor assembly are disposed between the housing and the cover. A motor swashplate is disposed between the motor assembly and the housing. The upper end face of the motor swashplate is horizontal, and the lower end face is inclined. A motor cavity is disposed inside the housing. The upper end face of the motor swashplate abuts against the top wall of the motor cavity and is fixed by at least two cylindrical pins. The upper end of the motor swashplate and the housing together form a fixing groove. A bearing is fixedly disposed in the fixing groove. A motor spindle is connected inside the bearing. The side of the motor swashplate is a non-contact free surface. A motor thrust plate is fixedly connected to the lower end face of the motor swashplate at an incline. The motor spindle passes through the motor swashplate and the motor thrust plate and is connected to the motor assembly. A motor distribution plate is fixedly connected to the upper end of the cover. The distribution surface of the motor assembly and the distribution surface of the motor distribution plate cooperate to realize the distribution of high-pressure oil and low-pressure oil.

[0006] In the aforementioned hydrostatic continuously variable transmission device, the motor assembly includes a motor cylinder body fixedly connected to the motor spindle. Multiple motor plunger holes are provided circumferentially within the motor cylinder body. Motor plungers are slidably disposed within these motor plunger holes. A motor slide is slidably connected to the upper spherical surface of each motor plunger. The motor slide slide slides against a motor thrust plate via a motor return plate. The motor return plate is sleeved on the outer circumference of a motor ball joint. The motor ball joint is sleeved outside the motor cylinder body. A motor retaining ring is also fixedly disposed within the motor cylinder body. A motor needle roller and a motor spring are sequentially disposed between the motor retaining ring and the motor ball joint. The motor spring, through the motor needle roller, presses the motor ball joint against the motor return plate. The motor return plate presses the motor slide against the motor thrust plate.

[0007] In the above-mentioned hydrostatic continuously variable transmission device, the lower end of the motor cylinder body and the upper end of the motor distribution plate slide against each other to realize the distribution of high-pressure oil and low-pressure oil.

[0008] In the aforementioned hydrostatic continuously variable transmission device, the motor cylinder body has a plunger cavity and an oil passage communicating with the plunger cavity, and the oil passage is matched with the distribution surface of the motor oil distribution plate.

[0009] In the aforementioned hydrostatic continuously variable transmission device, the end of the oil passage near the plunger cavity is provided with a flared inclined groove one, and the end of the oil passage near the motor distribution plate is provided with a flared inclined groove two.

[0010] In the aforementioned hydrostatic continuously variable transmission device, the bearing is a deep groove ball bearing for a motor.

[0011] In the aforementioned hydrostatic continuously variable transmission device, a motor needle roller bearing is fixedly connected between the housing cover and the motor spindle.

[0012] In the aforementioned hydrostatic continuously variable transmission device, a pump spindle is rotatably connected between the housing and the cover. The pump assembly includes a pump cylinder body fixedly connected to the pump spindle. Multiple pump plunger holes are provided circumferentially within the pump cylinder body. Pump plungers are slidably disposed within the pump plunger holes. A pump slide is slidably connected to the upper spherical surface of each pump plunger. The pump slide slides against the pump thrust plate via a pump return plate. The pump return plate is sleeved on the outer circumference of a pump ball joint. The pump ball joint is sleeved outside the pump cylinder body. A pump retaining ring is also fixedly disposed within the pump cylinder body. A pump needle roller and a pump spring are sequentially disposed between the pump retaining ring and the pump ball joint. The pump spring, through the pump needle roller, presses the pump ball joint against the pump return plate. The pump return plate presses the pump slide against the pump thrust plate.

[0013] Compared with the prior art, the technical effects of this utility model are as follows: First, by fixing the upper end face of the motor swashplate horizontally to the housing and positioning it with a cylindrical pin, the side of the motor swashplate is a free surface without contact. The lower end of the motor swashplate is inclinedly and fixedly connected to a motor thrust plate for sliding against the motor slide. The motor swashplate has radial micro-adjustment, which effectively avoids circumferential wear of the motor thrust plate, motor swashplate and housing caused by rotational thrust, improves the service life of the motor swashplate and motor thrust plate, and improves the reliability of the whole machine; Second, the inclined groove one and inclined groove two design at both ends of the oil passage can significantly reduce the turbulence and cavitation generated when the high-pressure oil flows, and improve the efficiency and stability of the hydraulic system. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is an enlarged view of section A of this utility model.

[0016] Figure 3 This is a cross-sectional view of the motor swashplate of this utility model.

[0017] Drawing number markings: 1. Housing; 101. Motor cavity; 2. Housing cover; 3. Motor swashplate; 301. Upper end face; 302. Lower end face; 303. Side face; 4. Cylindrical pin; 5. Fixing groove; 6. Bearing one; 7. Motor spindle; 8. Motor thrust plate; 9. Motor oil distribution plate; 10. Motor cylinder body; 1001. Piston cavity; 1002. Oil passage hole; 1003. Inclined groove one; 1004. Inclined groove two; 11. Motor plunger; 12. Motor slide; 13. Motor return plate; 14. Motor ball joint; 15. Motor retaining ring; 16. Motor needle roller; 17. Motor spring; 18. Motor needle roller bearing; 19. Pump spindle; 20. Pump cylinder; 21. Pump plunger; 22. Pump slide; 23. Pump return plate; 24. Pump thrust plate; 25. Pump ball joint; 26. Pump retaining ring; 27. Pump needle roller; 28. Pump spring. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0019] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] according to Figures 1 to 3As shown, a hydrostatic continuously variable transmission device continuously changes the speed and direction of a motor by altering the flow rate and direction of the pump's output oil, thereby achieving stepless speed transmission of power from the pump spindle 19 to the motor spindle 7. The device includes a housing 1 and a cover 2 fixedly connected together. A pump assembly and a motor assembly are disposed between the housing 1 and the cover 2. A motor swashplate 3 is disposed between the motor assembly and the housing 1. The upper end face 301 of the motor swashplate 3 is horizontal, and the lower end face 302 is inclined. A motor cavity 101 is provided inside the housing 1. The upper end face 301 of the motor swashplate 3 abuts against the top wall of the motor cavity 101 and is fixed by at least two cylindrical pins 4. The upper end of the motor swashplate 3 and the housing 1 together form a fixing groove. 5. A bearing 6 is fixedly installed inside the fixed groove 5. The motor spindle 7 is connected inside the bearing 6. The side 303 of the motor swashplate 3 is a free surface without contact. The lower end face 302 of the motor swashplate 3 is inclinedly and fixedly connected to the motor thrust plate 8. The motor spindle 7 passes through the motor swashplate 3 and the motor thrust plate 8 and is connected to the motor assembly. The upper end of the cover 2 is fixedly connected to the motor oil distribution plate 9. The distribution surface of the motor assembly and the distribution surface of the motor oil distribution plate 9 cooperate to realize the distribution of high-pressure oil and low-pressure oil. The motor oil distribution plate 9 has an oil inlet channel and an oil return channel. The surfaces of the oil inlet channel and the oil return channel that abut against the motor assembly are the distribution surfaces.

[0021] The motor assembly includes a motor cylinder 10 fixedly connected to the motor spindle 7. Multiple motor plunger holes 11 are provided circumferentially inside the motor cylinder 10. Motor plungers 11 are slidably disposed within these holes. A motor slide 12 is slidably connected to the upper spherical surface of each motor plunger 11. The motor slide 12 slides against the motor thrust plate 8 via a motor return plate 13. The motor return plate 13 is sleeved around the outer periphery of a motor ball joint 14, which is sleeved outside the motor cylinder 10. A motor retaining ring 15 is also fixedly disposed inside the motor cylinder 10. A motor needle roller 16 and a motor spring 17 are sequentially disposed between the motor retaining ring 15 and the motor ball joint 14. The motor spring 17, through the motor needle roller 16, presses the motor ball joint 14 against the motor return plate 13. The motor return plate 13 presses the motor slide 12 against the motor thrust plate 8. The lower end of the motor cylinder body 10 slides against the upper end of the motor distribution plate 9 to achieve the distribution of high-pressure and low-pressure oil. The motor cylinder body 10 has a plunger cavity 1001 and an oil passage 1002 communicating with the plunger cavity 1001. The oil passage 1002 mates with the distribution surface of the motor distribution plate 9. An flared inclined groove 1003 is provided at one end of the oil passage 1002 near the plunger cavity 1001, and an flared inclined groove 2004 is provided at the other end of the oil passage 1002 near the motor distribution plate 9. The design of the inclined grooves 1003 and 1004 at both ends of the oil passage 1002 significantly reduces turbulence and cavitation generated during high-pressure oil flow, improving the efficiency and stability of the hydraulic system. Bearing 6 is a deep groove ball bearing for motors. A needle roller bearing 18 for motors is fixedly connected between the housing cover 2 and the motor spindle 7. The upper end face 301 of the motor swash plate 3 is horizontally fixed to the housing 1 and positioned by the cylindrical pin 4. The side face 303 of the motor swash plate 3 is a free surface without contact. The lower end of the motor swash plate 3 is inclinedly fixedly connected to the motor thrust plate 8 for sliding against the motor slide 12. The motor swash plate 3 has radial micro-adjustment, which effectively avoids circumferential wear caused by rotational thrust on the motor thrust plate 8, the motor swash plate 3 and the housing 1, thereby improving the service life of the motor swash plate 3 and the motor thrust plate 8 and improving the overall reliability of the machine.

[0022] A pump spindle 19 is rotatably connected between the housing 1 and the cover 2. The pump assembly includes a pump cylinder 20 fixedly connected to the pump spindle 19. Multiple pump plunger holes 21 are provided in the pump cylinder 20 along the circumferential direction. Pump plungers 21 are slidably arranged in the pump plunger holes. A pump slide 22 is slidably connected to the upper spherical surface of the pump plunger 21. The pump slide 22 slides against the pump thrust plate 24 through the pump return plate 23. The pump return plate 23 is sleeved on the outer periphery of the pump ball joint 25. The pump ball joint 25 is sleeved on the outside of the pump cylinder 20. A pump retaining ring 26 is also fixedly arranged in the pump cylinder 20. A pump needle roller 27 and a pump spring 28 are arranged in sequence between the pump retaining ring 26 and the pump ball joint 25. The pump spring 28 abuts the pump ball joint 25 against the pump return plate 23 through the pump needle roller 27. The pump return plate 23 abuts the pump slide 22 against the pump thrust plate 24.

[0023] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A hydrostatic continuously variable transmission device, comprising a housing (1) and a cover (2) fixedly connected, wherein a pump assembly and a motor assembly are disposed between the housing (1) and the cover (2), and a motor swashplate (3) is disposed between the motor assembly and the housing (1), characterized in that: The upper end face (301) of the motor swashplate (3) is horizontal and the lower end face (302) is inclined. A motor cavity (101) is provided inside the housing (1). The upper end face (301) of the motor swashplate (3) abuts against the top wall of the motor cavity (101) and is fixed by at least two cylindrical pins (4). The upper end of the motor swashplate (3) and the housing (1) together form a fixing groove (5). A bearing (6) is fixedly installed in the fixing groove (5). The bearing (6) is connected to the motor. The main shaft (7) is connected to the motor assembly. The side (303) of the motor swash plate (3) is a free surface without contact. The lower end face (302) of the motor swash plate (3) is inclinedly and fixedly connected to the motor thrust plate (8). The motor main shaft (7) passes through the motor swash plate (3) and the motor thrust plate (8) and is connected to the motor assembly. The upper end of the cover (2) is fixedly connected to the motor oil distribution plate (9). The distribution surface of the motor assembly and the distribution surface of the motor oil distribution plate (9) cooperate to realize the distribution of high pressure oil and low pressure oil.

2. The hydrostatic continuously variable transmission device according to claim 1, characterized in that: The motor assembly includes a motor cylinder (10) fixedly connected to the motor spindle (7). The motor cylinder (10) has multiple motor plunger (11) holes arranged circumferentially inside. A motor plunger (11) is slidably disposed within each of the motor plunger (11) holes. A motor slide (12) is slidably connected to the upper spherical surface of each motor plunger (11). The motor slide (12) slides against the motor thrust plate (8) via a motor return plate (13). The motor return plate (13) is sleeved on the motor ball joint. 14) On the outer periphery, the motor ball joint (14) is sleeved on the outside of the motor cylinder (10). A motor retaining ring (15) is also fixedly installed inside the motor cylinder (10). A motor needle roller (16) and a motor spring (17) are arranged in sequence between the motor retaining ring (15) and the motor ball joint (14). The motor spring (17) uses the motor needle roller (16) to push the motor ball joint (14) against the motor return plate (13). The motor return plate (13) pushes the motor slide (12) against the motor thrust plate (8).

3. The hydrostatic continuously variable transmission device according to claim 2, characterized in that: The lower end of the motor cylinder (10) slides against the upper end of the motor oil distribution plate (9) to achieve the distribution of high-pressure oil and low-pressure oil.

4. The hydrostatic continuously variable transmission device according to claim 3, characterized in that: The motor cylinder (10) has a plunger cavity (1001) and an oil passage (1002) communicating with the plunger cavity (1001). The oil passage (1002) is matched with the distribution surface of the motor oil distribution plate (9).

5. The hydrostatic continuously variable transmission device according to claim 4, characterized in that: The oil passage (1002) is provided with an flared inclined groove one (1003) at one end near the plunger cavity (1001), and the oil passage (1002) is provided with an flared inclined groove two (1004) at one end near the motor oil distribution plate (9).

6. The hydrostatic continuously variable transmission device according to claim 2, characterized in that: The bearing 1 (6) is a deep groove ball bearing for motors.

7. A hydrostatic continuously variable transmission device according to claim 6, characterized in that: A needle roller bearing (18) for a motor is fixedly connected between the housing cover (2) and the motor spindle (7).

8. A hydrostatic continuously variable transmission device according to any one of claims 1 to 7, characterized in that: A pump spindle (19) is rotatably connected between the housing (1) and the cover (2). The pump assembly includes a pump cylinder body (20) fixedly connected to the pump spindle (19). The pump cylinder body (20) has multiple pump plunger (21) holes along the circumferential direction. Pump plungers (21) are slidably disposed in the pump plunger (21) holes. A pump slide (22) is slidably connected to the upper spherical surface of the pump plunger (21). The pump slide (22) slides against the pump thrust plate (24) through the pump return plate (23). The pump return plate (23) is sleeved on the outer periphery of the pump ball joint (25), the pump ball joint (25) is sleeved on the outside of the pump cylinder (20), and a pump retaining ring (26) is fixedly installed inside the pump cylinder (20). A pump needle roller (27) and a pump spring (28) are arranged sequentially between the pump retaining ring (26) and the pump ball joint (25). The pump spring (28) uses the pump needle roller (27) to press the pump ball joint (25) against the pump return plate (23), and the pump return plate (23) presses the pump slide (22) against the pump thrust plate (24).

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