Variable displacement oil pump

Abstract

The application discloses a variable displacement oil pump, and belongs to the technical field of oil pumps, which comprises a pump shell, a pump shaft and a driving wheel, wherein the pump shell is internally provided with a discharge chamber and a suction chamber, a transmission device and a speed regulating device are arranged between the driving wheel and the pump shaft, the driving wheel drives the pump shaft to rotate through the transmission device, and the speed regulating device acts on the transmission device based on the pressure in the discharge chamber. When the application is used, the driving wheel drives the pump shaft to rotate through the transmission device, so that the oil pump can normally operate; in the process of normal movement of the oil pump, the speed regulating device acts on the transmission device based on the pressure in the discharge chamber, so that the rotating speed of the pump shaft is changed under the condition that the rotating speed of the driving wheel is unchanged; further, the purpose of adjusting the displacement of the oil pump is achieved; when the pressure in the discharge chamber is too large, the speed regulating device feeds back the transmission device, so that the transmission device reduces the rotating speed of the pump shaft, the purpose of reducing the pressure in the discharge chamber is achieved, and the problem that the engine moving parts cannot be effectively lubricated due to the excessively high engine oil pressure is prevented.

Description

Technical Field

[0001] This invention relates to an oil pump, and more particularly to a variable displacement oil pump. Background Technology

[0002] When a car engine is running, the lubrication system also works to lubricate the moving parts inside the engine. The normal range for engine oil pressure is mostly between 2.5 and 3.5 bar. At idle, the oil pressure should fluctuate between 2 and 2.5 bar. If the oil pressure deviates from this normal range, it will cause significant damage to the car engine. Excessive oil pressure will increase fuel consumption. This is because lubricating oil with a set viscosity will generate greater frictional resistance between engine parts, thereby increasing power loss and directly leading to increased fuel consumption. Therefore, maintaining the oil pressure at an appropriate level helps optimize fuel economy.

[0003] A car engine operates under both high-load and low-load conditions (such as high-speed driving and rapid acceleration). Existing oil pumps, through electronic control systems, ECUs, and solenoid valves, regulate their displacement to meet the oil pressure requirements of different operating conditions. However, oil pressure must not be too high under any circumstances. When the engine oil pressure exceeds the normal range, a small teapot-shaped indicator light on the dashboard will illuminate. This oil light monitors whether the oil is being smoothly delivered to all parts of the engine. Only when the oil pressure is maintained at a normal level can the oil effectively coat every surface of the engine components, providing necessary protection. Both excessively high and low oil pressures will adversely affect engine operation and may even damage engine parts. Inside the engine, oil not only plays a lubricating role but also performs multiple tasks such as heat dissipation, cleaning, and sealing. Summary of the Invention

[0004] The purpose of this invention is to provide a variable displacement oil pump that can adjust the oil pressure to reduce when the engine oil pressure is too high, effectively solving the problem of insufficient lubrication of engine moving parts caused by excessively high oil pressure in the prior art.

[0005] The present invention adopts the following technical solution: a variable displacement oil pump, including a pump casing, a pump shaft and a drive wheel. The pump casing is provided with a discharge chamber and a suction chamber. A transmission device and a speed regulating device are provided between the drive wheel and the pump shaft. The drive wheel drives the pump shaft to rotate through the transmission device. The speed regulating device acts on the transmission device based on the pressure in the discharge chamber, so that the speed of the pump shaft is changed while the speed of the drive wheel remains unchanged.

[0006] Furthermore, the transmission device includes a central gear and planetary gears. A drive shaft is fixedly mounted on the lower end face of the drive wheel. The central gear is fixedly mounted on the bottom end of the drive shaft. A planetary carrier is rotatably connected to the outer surface of the drive shaft. The planetary gears are rotatably connected to the planetary carrier. A gear ring is fixedly mounted on the top end of the pump shaft. Each planetary gear meshes with the gear ring.

[0007] Furthermore, the speed regulating device includes a worm and a worm wheel. The lower end face of each planetary gear is fixedly equipped with a worm wheel via a connecting shaft. The worm is perpendicular to the connecting shaft and rotatably connected to the gear ring. The worm meshes with the worm wheel.

[0008] Furthermore, the speed regulating device also includes a worm gear drive device, which drives the worm to rotate based on the pressure in the discharge chamber. The greater the pressure in the discharge chamber, the faster the worm gear drive device drives the worm to rotate.

[0009] Furthermore, the worm drive device includes a driven gear fixedly mounted on each worm and a conical friction wheel rotatably connected to the gear ring. The inner end of the rotating shaft of the conical friction wheel is fixedly mounted with a driving gear, and the outer end of the rotating shaft is rotatably connected to the gear ring. The driving gear meshes with two driven gears. A feedback cylinder is fixedly mounted on the upper end face of the pump housing. A feedback piston is slidably mounted inside the feedback cylinder in the vertical direction. The bottom end of the feedback oil pipe is connected to the discharge chamber inside the pump housing, and the top end of the feedback oil pipe is connected to the space inside the feedback cylinder. A conical surface is formed on the outer surface of the feedback piston.

[0010] Furthermore, the rotating shaft of the conical friction wheel is slidably connected to the conical friction wheel; a compensating spring is fixedly provided between the conical friction wheel and the gear ring, and the compensating spring pushes the conical friction wheel to move inward continuously, and the conical angle of the conical surface of the feedback piston is greater than the conical angle of the conical friction wheel.

[0011] Furthermore, an outer cylinder is fixedly provided on the lower end face of the gear ring, and the feedback cylinder extends upward into the outer cylinder and is rotatably connected to the outer cylinder.

[0012] Furthermore, the top end of the pump shaft extends between the worm gear and the planetary gear and is fixed to the outer cylinder by several support rods.

[0013] Furthermore, the planetary carrier includes a bushing rotatably connected to the drive shaft. Several radial rods are fixedly arranged on the outer surface of the bushing along the radial direction. Each radial rod has a vertical shaft fixedly arranged at its outer end along the vertical direction. Each planetary gear is rotatably connected to the corresponding vertical shaft.

[0014] Furthermore, a drive sleeve is fixedly provided on the lower end face of the drive wheel, and a cylindrical body is fixedly provided on the top end of the drive shaft. The cylindrical body is inserted into the bushing, and the drive wheel drives the drive shaft to rotate through the drive sleeve and the cylindrical body. An oil seal cover is fixedly provided on the bottom end of the drive sleeve, and the lower end face of the oil seal cover is rotatably connected to the upper end face of the gear ring.

[0015] I. This invention, by setting up a drive wheel, a transmission device, and a speed regulating device, allows the drive wheel to drive the pump shaft to rotate through the transmission device during use, thus achieving the normal operation of the oil pump. During the normal operation of the oil pump, the speed regulating device acts on the transmission device based on the pressure in the discharge chamber, thereby changing the speed of the pump shaft while keeping the speed of the drive wheel constant; thus achieving the purpose of regulating the oil pump displacement. When the pressure in the discharge chamber is too high, the speed regulating device feeds back to the transmission device, causing the transmission device to reduce the speed of the pump shaft, thereby reducing the pressure in the discharge chamber and preventing the problem of ineffective lubrication of the moving parts of the engine caused by excessively high oil pressure.

[0016] II. This invention utilizes a central gear, planetary gears, a gear ring, a pump shaft, a worm gear, a worm, and a worm drive device. In operation, when the drive wheel rotates the central gear, which in turn drives the planetary gears to rotate, the worm gear cannot drive the worm to rotate. Therefore, the planetary gears cannot rotate on their own axis, resulting in the central gear only driving the planetary gears to revolve. This causes the planetary gears to drive the gear ring 10 to rotate, which in turn drives the pump shaft to rotate, achieving the normal purpose of the drive wheel driving the pump shaft. During normal operation of the oil pump, the worm drive device drives the worm to rotate based on the pressure within the discharge chamber. The higher the pressure within the discharge chamber, the faster the worm drive device drives the worm to rotate. This causes the worm to drive the worm gear to rotate, which in turn drives the planetary gears to rotate on their own axis. The rotation of the planetary gears causes the gear ring speed to decrease, which in turn decreases the pump shaft speed, thereby reducing the oil pump's displacement and lowering the pressure within the discharge chamber. Ultimately, this achieves the goal of stabilizing the oil pump's discharge pressure within a set range. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the internal three-dimensional structure of the drive sleeve and pump housing in this invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the outer cylinder in this invention; Figure 4 This is a three-dimensional structural diagram of the pump shaft in this invention; Figure 5 This is a schematic diagram of the internal three-dimensional structure of the outer cylinder in this invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the feedback piston in this invention; Figure 7 This is a three-dimensional structural diagram of the pump shaft and drive shaft in this invention; Figure 8 This is a front view schematic diagram of the feedback piston structure in this invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point A in the diagram; Figure 10 This is a schematic diagram of the internal three-dimensional structure of the feedback cylinder in this invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the gear ring in this invention; Figure 12 This is a top view schematic diagram of the inner rotor and outer rotor structure in this invention.

[0018] In the diagram, 1. Pump casing; 2. Pump shaft; 3. Drive wheel; 4. Discharge chamber; 5. Suction chamber; 6. Central gear; 7. Planetary gear; 8. Drive shaft; 9. Planetary carrier; 10. Gear ring; 11. Worm; 12. Worm wheel; 13. Connecting shaft; 14. Driven gear; 15. Conical friction wheel; 16. Rotating shaft; 17. Drive gear; 18. Feedback cylinder; 19. Feedback piston; 20. Feedback oil pipe; 21. Compensating spring; 22. Outer cylinder; 23. Support rod; 24. Inner bushing; 25. Bushing; 26. Radial rod; 27. Vertical shaft; 28. Drive sleeve; 29. ​​Cylindrical body; 30. Oil seal cover; 31. Inner rotor; 32. Outer rotor; 33. Return spring. Detailed Implementation

[0019] Please see Figure 1-12 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The variable displacement oil pump of the present invention includes a pump housing 1, a pump shaft 2, and a drive wheel 3. The pump housing 1 is provided with a discharge chamber 4 and a suction chamber 5. A transmission device and a speed regulating device are provided between the drive wheel 3 and the pump shaft 2. The drive wheel 3 drives the pump shaft 2 to rotate through the transmission device. The speed regulating device acts on the transmission device based on the pressure in the discharge chamber 4, so that the speed of the pump shaft 2 is changed while the speed of the drive wheel 3 remains unchanged; thereby achieving the purpose of adjusting the oil pump displacement.

[0020] In this embodiment, the transmission device includes a central gear 6 and planetary gears 7. A drive shaft 8 is fixedly mounted on the lower end face of the drive wheel 3. The central gear 6 is fixedly mounted on the bottom end of the drive shaft 8. A planetary carrier 9 is rotatably connected to the outer surface of the drive shaft 8. The planetary gears 7 are rotatably connected to the planetary carrier 9. A gear ring 10 is fixedly mounted on the top end of the pump shaft 2. Each planetary gear 7 meshes with the gear ring 10. The drive wheel 3 drives the central gear 6 to rotate through the drive shaft 8. Since the speed regulating device restricts the rotation of the planetary gears 7, the central gear 6 can only drive the planetary gears 7 to revolve. Thus, the central gear 6 drives the gear ring 10 to rotate through the planetary gears 7. The gear ring 10 drives the pump shaft 2 to rotate, thereby achieving the purpose of the drive wheel 3 driving the pump shaft 2 to rotate. When the pressure in the discharge chamber 4 increases, the speed regulating device drives the planetary gears 7 to rotate based on the pressure in the discharge chamber 4. The higher the pressure in the discharge chamber 4, the greater the speed at which the speed regulating device drives the planetary gears 7 to rotate. Since the planetary gears 7 rotate, the speed at which the planetary gears 7 revolve and drive the gear ring 10 to rotate decreases, thereby achieving the purpose of adjusting the pump displacement according to the pressure in the discharge chamber 4.

[0021] In this embodiment, the speed regulating device includes a worm 11 and a worm wheel 12. The lower end face of each planetary gear 7 is fixedly provided with a worm wheel 12 through a connecting shaft 13. The worm 11 is perpendicular to the connecting shaft 13 and rotatably connected to the gear ring 10. The worm 11 and the worm wheel 12 mesh with each other. When the drive wheel 3 drives the central gear 6 to rotate through the drive shaft 8, and the rotation of the central gear 6 drives the planetary gear 7 to rotate, the worm wheel 12 cannot drive the worm 11 to rotate. Therefore, the planetary gear 7 cannot rotate, which leads to the central gear 6 only driving the planetary gear 7 to revolve. This causes the planetary gear 7 to drive the gear ring 10 to rotate, and the gear ring 10 to drive the pump shaft 2 to rotate, thus achieving the purpose of the drive wheel 3 driving the pump shaft 2 to rotate normally.

[0022] In this embodiment, the speed regulating device also includes a worm gear drive device. The worm gear drive device drives the worm 11 to rotate based on the pressure in the discharge chamber 4. The greater the pressure in the discharge chamber 4, the faster the worm gear drive device drives the worm 11 to rotate. This causes the worm 11 to drive the worm wheel 12 to rotate, and the worm wheel 12 to drive the planetary gear 7 to rotate. Since the central gear 6 drives the gear ring 10 to rotate at the maximum speed when the planetary gear 7 is completely stationary, the rotation of the planetary gear 7 causes the gear ring 10 to rotate, which in turn causes the pump shaft 2 to rotate, thereby reducing the pump's displacement and achieving the purpose of reducing the pressure in the discharge chamber 4. Ultimately, this achieves the purpose of stabilizing the pump's discharge pressure within the set range.

[0023] In this embodiment, the worm drive device includes a driven gear 14 fixedly mounted on each worm 11, and a conical friction wheel 15 rotatably connected to the gear ring 10. A driving gear 17 is fixedly mounted on the inner end of the rotating shaft 16 of the conical friction wheel 15, and the outer end of the rotating shaft 16 is rotatably connected to the gear ring 10. The driving gear 17 meshes with both driven gears 14. A feedback cylinder 18 is fixedly mounted on the upper end face of the pump housing 1. A feedback piston 19 is slidably mounted inside the feedback cylinder 18 in the vertical direction. The bottom end of the feedback oil pipe 20 communicates with the discharge chamber 4 inside the pump housing 1, and the top end of the feedback oil pipe 20 communicates with the space inside the feedback cylinder 18. A conical surface is formed on the outer surface of the feedback piston 19. During use, when the pressure in the discharge chamber 4 inside the pump housing 1 increases, the oil in the pump housing 1 enters the feedback cylinder 18 through the feedback oil pipe 20, pushing the feedback piston 19 upward, causing the conical surface of the feedback piston 19 to... The conical friction wheel 15, worm 11, and worm wheel 12 are in contact with the conical friction wheel 15. The conical friction wheel 15, worm 11, and worm wheel 12 always rotate with the gear ring 10. The friction force generated by the feedback piston 19 and the conical friction wheel 15 causes the conical friction wheel 15 to rotate. The rotation of the conical friction wheel 15 drives the drive gear 17 to rotate, the drive gear 17 drives the driven gear 14 to rotate, the driven gear 14 drives the worm 11 to rotate, the worm 11 drives the worm wheel 12 to rotate, and the worm wheel 12 drives the planetary gear 7 to rotate. The rotation of the planetary gear 7 reduces the speed of the gear ring 10. As a result, the speed of the pump shaft 2 is reduced, which reduces the displacement of the oil pump and ultimately achieves the purpose of stabilizing the discharge pressure of the oil pump within the set range. A return spring 33 is fixedly installed between the lower end face of the feedback piston 19 and the inner bottom wall of the feedback cylinder 18. When the oil pressure transmitted by the feedback cylinder 18 decreases, the return spring 33 pulls the feedback cylinder 18 downward, causing the feedback cylinder 18 to move downward.

[0024] In this embodiment, the rotating shaft 16 of the conical friction wheel 15 is slidably connected to the conical friction wheel 15, and the conical friction wheel 15 and the rotating shaft 16 can only slide against each other and cannot rotate relative to each other; a compensating spring 21 is fixedly provided between the conical friction wheel 15 and the gear ring 10, and the compensating spring 21 pushes the conical friction wheel 15 to move inward continuously, and the conical angle of the conical surface of the feedback piston 19 is greater than the conical angle of the conical friction wheel 15; the greater the oil pressure in the feedback cylinder 18, the greater the upward force of the feedback piston 19, and the greater the force of the feedback piston 19 in contact with the conical friction wheel 15, the greater the force of the compensating spring 21 that pushes the conical friction wheel 15 to move outward. The greater the distance that the feedback piston 19 moves outward, the larger the outer diameter of the conical surface of the feedback piston 19 at the contact point with the conical friction wheel 15. (See reference...) Figure 9This causes the rotational speed of the conical friction wheel 15 to increase, which in turn increases the rotational speed of the planetary gear 7, which in turn reduces the rotational speed of the gear ring 10, and consequently reduces the rotational speed of the pump shaft 2. This achieves the goal that the greater the pressure in the discharge chamber 4, the greater the reduction in the rotational speed of the pump shaft 2, ultimately stabilizing the discharge pressure of the oil pump within the set range. When the oil pressure transmitted by the feedback cylinder 18 decreases, the reset spring 33 pulls the feedback cylinder 18 downward, causing the feedback cylinder 18 to move downward. Meanwhile, the conical friction wheel 15 moves inward under the push of the compensation spring 21, ensuring that the conical friction wheel 15 is always in contact with the conical surface of the feedback piston 19, but the rotational speed of the conical friction wheel 15 decreases.

[0025] It should be noted that when the oil pump is in use, under normal pressure range, the feedback piston 19 does not contact the conical friction wheel 15. Only when the pressure in the discharge chamber 4 is too high and exceeds the set value, the upward stroke of the feedback piston 19 begins to contact the conical friction wheel 15, and begins to reduce and adjust the pressure in the discharge chamber 4.

[0026] In this embodiment, an outer cylinder 22 is fixedly provided on the lower end face of the gear ring 10, and the feedback cylinder 18 extends upward into the outer cylinder 22 and is rotatably connected to the outer cylinder 22; this increases the stability of the rotation of the gear ring 10.

[0027] In this embodiment, the top end of the pump shaft 2 extends between the worm gear 12 and the planetary gear 7 and is fixedly mounted to the outer cylinder 22 via several support rods 23, thereby achieving the purpose of fixing the top end of the pump shaft 2 to the gear ring 10.

[0028] In this embodiment, an inner bushing 24 is fixedly installed inside the outer cylinder 22. The bottom end of the inner bushing 24 is rotatably connected to the feedback cylinder 18, and both ends of the worm gear 11 are rotatably connected to the inner bushing 24. The outer end of the rotating shaft 16 is rotatably connected to the inner bushing 24. The installation of the inner bushing 24 not only increases the stability of the gear ring 10 and the outer cylinder 22, but also increases the compactness of the internal rotating parts.

[0029] In this embodiment, the planetary carrier 9 includes a bushing 25 rotatably connected to the drive shaft 8. A plurality of radial rods 26 are fixedly arranged on the outer surface of the bushing 25 in the radial direction. A vertical shaft 27 is fixedly arranged at the outer end of each radial rod 26 in the vertical direction. Each planetary gear 7 is rotatably connected to the corresponding vertical shaft 27, thereby achieving the purpose of rotatably connecting the planetary gear 7 to the planetary carrier 9.

[0030] In this embodiment, a drive sleeve 28 is fixedly provided on the lower end face of the drive wheel 3, and a cylindrical body 29 is fixedly provided on the top end of the drive shaft 8. The cylindrical body 29 is inserted into the bushing 25 to achieve the purpose of driving the drive wheel 3 to drive the drive shaft 8 to rotate through the drive sleeve 28 and the cylindrical body 29. An oil seal cover 30 is fixedly provided on the bottom end of the drive sleeve 28. The lower end face of the oil seal cover 30 is rotatably connected to the upper end face of the gear ring 10. The drive wheel 3 drives the drive shaft 8 to rotate through the drive sleeve 28 and the cylindrical body 29. The drive shaft 8 drives the central gear 6 to rotate. The central gear 6 drives the gear ring 10 to rotate through the planetary gear 7. The drive sleeve 28 drives the oil seal cover 30 to rotate at the same time. If the speed of the drive wheel 3 and the gear ring 10 are the same, then the gear ring 10 and the oil seal cover 30 are relatively stationary. If the speed of the gear ring 10 is lower than the speed of the drive wheel 3, then the gear ring 10 and the oil seal cover 30 rotate relative to each other.

[0031] In this embodiment, an inner rotor 31 is fixedly installed at the bottom end of the pump shaft 2. The inner rotor 31 is an external gear. An outer rotor 32 is rotatably connected inside the pump housing 1. The outer rotor 32 is an internal gear. The rotation centers of the inner rotor 31 and the outer rotor 32 are different, and the inner rotor 31 and the outer rotor 32 mesh internally. The rotation of the pump shaft 2 drives the inner rotor 31 to rotate, and the inner rotor 31 drives the outer rotor 32 to rotate. Due to the eccentricity of the inner rotor 31 and the outer rotor 32, they cooperate with the pump housing 1 to generate a discharge chamber 4 and a suction chamber 5 with regular volume changes, thereby achieving the purpose of pumping oil.

[0032] The working principle of this invention is as follows: Under normal use, the drive wheel 3 drives the pump shaft 2 to rotate, thereby achieving the purpose of pumping oil. Specifically, the drive wheel 3 drives the drive shaft 8 to rotate through the drive sleeve 28 and the cylindrical body 29. The drive shaft 8 drives the central gear 6 to rotate. Since the worm gear 12 cannot drive the worm 11 to rotate, the central gear 6 drives the planetary gear 7 to revolve, which in turn drives the gear ring 10 to rotate. The gear ring 10 then drives the pump shaft 2 to rotate, thus achieving the purpose of the drive wheel 3 driving the pump shaft 2 to rotate. When the pressure in the discharge chamber 4 increases, the oil enters the feedback cylinder 18 through the feedback oil pipe 20, pushing the feedback piston 19 to... The upward movement causes the feedback piston 19 to push the conical friction wheel 15 outward, increasing the outer diameter of the contact point between the conical surface of the feedback piston 19 and the conical friction wheel 15. This increases the rotational speed of the conical friction wheel 15, which in turn increases the rotational speed of the worm 11. The worm 11 drives the worm wheel 12 to rotate, which in turn increases the rotational speed of the planetary gear 7. This, in turn, reduces the rotational speed of the planetary gear 7's revolution that drives the gear ring 10, which in turn reduces the rotational speed of the gear ring 10 that drives the pump shaft 2. This reduces the pump displacement and ultimately stabilizes the pump's discharge pressure within the set range.

Claims

1. A variable displacement oil pump, characterized in that: It includes a pump casing, a pump shaft, and a drive wheel. The pump casing is provided with a discharge chamber and a suction chamber. A transmission device and a speed regulating device are provided between the drive wheel and the pump shaft. The drive wheel drives the pump shaft to rotate through the transmission device. The speed regulating device acts on the transmission device based on the pressure in the discharge chamber, so as to change the speed of the pump shaft while keeping the speed of the drive wheel constant.

2. The variable displacement oil pump according to claim 1, characterized in that: The transmission device includes a central gear and planetary gears. A drive shaft is fixedly mounted on the lower end face of the drive wheel. The central gear is fixedly mounted on the bottom end of the drive shaft. A planetary carrier is rotatably connected to the outer surface of the drive shaft. The planetary gears are rotatably connected to the planetary carrier. A gear ring is fixedly mounted on the top end of the pump shaft. Each planetary gear meshes with the gear ring.

3. The variable displacement oil pump according to claim 2, characterized in that: The speed regulating device includes a worm and a worm wheel. The lower end face of each planetary gear is fixedly equipped with a worm wheel through a connecting shaft. The worm is perpendicular to the connecting shaft and rotatably connected to the gear ring. The worm meshes with the worm wheel.

4. The variable displacement oil pump according to claim 3, characterized in that: The speed regulating device also includes a worm gear drive device, which drives the worm to rotate based on the pressure in the discharge chamber. The greater the pressure in the discharge chamber, the faster the worm gear drive device drives the worm to rotate.

5. The variable displacement oil pump according to claim 4, characterized in that: The worm gear drive device includes a driven gear fixedly mounted on each worm and a conical friction wheel rotatably connected to the gear ring. The inner end of the rotating shaft of the conical friction wheel is fixedly mounted with a driving gear, and the outer end of the rotating shaft is rotatably connected to the gear ring. The driving gear meshes with two driven gears. A feedback cylinder is fixedly mounted on the upper end face of the pump housing. A feedback piston is slidably mounted in the feedback cylinder along the vertical direction. The bottom end of the feedback oil pipe is connected to the discharge chamber in the pump housing, and the top end of the feedback oil pipe is connected to the space in the feedback cylinder. A conical surface is formed on the outer surface of the feedback piston.

6. The variable displacement oil pump according to claim 5, characterized in that: The rotating shaft of the conical friction wheel is slidably connected to the conical friction wheel; a compensating spring is fixedly installed between the conical friction wheel and the gear ring, and the compensating spring pushes the conical friction wheel to move inward continuously, and the conical angle of the conical surface of the feedback piston is greater than the conical angle of the conical friction wheel.

7. The variable displacement oil pump according to claim 5, characterized in that: The lower end face of the gear ring is fixedly provided with an outer cylinder, and the feedback cylinder extends upward into the outer cylinder and is rotatably connected to the outer cylinder.

8. The variable displacement oil pump according to claim 6, characterized in that: The top end of the pump shaft extends between the worm gear and the planetary gear and is fixed to the outer cylinder by several support rods.

9. The variable displacement oil pump according to claim 2, characterized in that: The planetary carrier includes a bushing rotatably connected to the drive shaft. Several radial rods are fixedly arranged on the outer surface of the bushing in the radial direction. Each radial rod has a vertical shaft fixedly arranged at its outer end in the vertical direction. Each planetary gear is rotatably connected to the corresponding vertical shaft.

10. The variable displacement oil pump according to claim 2, characterized in that: A drive sleeve is fixedly installed on the lower end face of the drive wheel, and a cylindrical body is fixedly installed on the top end of the drive shaft. The cylindrical body is inserted into the bushing. The drive wheel drives the drive shaft to rotate through the drive sleeve and the cylindrical body. An oil seal cover is fixedly installed at the bottom end of the drive sleeve, and the lower end face of the oil seal cover is rotatably connected to the upper end face of the gear ring.

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