A gear oil pump

Abstract

The application discloses a gear oil pump which comprises a pump shell with a cylindrical middle part and a downward opening; a gear ring coaxially arranged in the inner cavity of the pump shell and rotationally connected with the pump shell; a driving gear eccentrically engaged in the gear ring; an end cover arranged at the lower end opening of the inner cavity of the pump shell and sealingly and fixedly connected with the pump shell; two groups of arc-shaped grooves symmetrically arranged in the middle part of the cavity of the end cover and corresponding to the meshing part and the separation part of the gear ring and the driving gear; suction grooves and discharge grooves respectively communicated with the left and right arc-shaped grooves; the suction grooves communicated with the bottom of the inner cavity of the reduction gearbox; the inner cavity of the discharge grooves provided with high-temperature discharge parts and low-temperature discharge parts; the discharge outlet of the high-temperature discharge part communicated with a radiator outside the reduction gearbox; and the discharge outlet of the low-temperature discharge part communicated with the inner cavity of the reduction gearbox; the application ensures the lubrication between the reduction gearboxes in the electric drive system and the appropriate working temperature of the electric drive system, and further increases the service life of the electric drive system.

Description

Technical Field

[0001] This invention relates to the field of oil pumps, and more particularly to a gear oil pump. Background Technology

[0002] Gear pumps pump or pressurize liquids by changing the working volume formed between the pump cylinder and the meshing gears. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws the liquid into the pump cylinder; conversely, the volume of the space on the meshing side decreases, expelling the liquid from the pump cylinder. The suction and discharge chambers are separated by the gear meshing line. The discharge pressure of a gear pump depends on the resistance at the pump outlet.

[0003] In existing technologies, gear oil pumps are commonly used in the gearbox cavity of electric drive systems. An electric drive system includes an electric motor, a motor controller, and a gearbox. Because the electric motor generates heat during operation, this heat forces the ambient temperature of the electric drive system to continuously rise. However, sustained high temperatures can adversely affect components in the electric drive system (e.g., demagnetization of permanent magnets in the motor, reduced shear strength of the oil film in the gearbox). Therefore, the gear oil pump transports gear oil to the radiator to remove excess heat from the electric drive system, thereby lowering the ambient temperature and maintaining it within a set range. However, when the initial ambient temperature of the electric drive system is low (e.g., when the vehicle is first started or during winter use), the gear oil pump will still pump gear oil to the radiator first. This results in a short-term lack of gear oil in the gearbox, exacerbating wear between components. Simultaneously, the low-temperature gear oil, after passing through the radiator, does not easily rise to the set temperature (excessively low gear oil temperature), causing a decrease in gear oil fluidity. This further contributes to a short-term lack of gear oil in the gearbox, reducing the service life of the electric drive system. Summary of the Invention

[0004] The purpose of this invention is to provide a gear oil pump that, when the operating temperature of the electric drive system is low, directly pumps lubricating oil between the components in the gearbox; when the operating temperature of the electric drive system is high, directly pumps lubricating oil to the radiator for heat exchange, thereby reducing the operating temperature of the electric drive system to a set temperature. This ensures lubrication between the gearbox components in the electric drive system and maintains the electric drive system at a suitable operating temperature, further increasing the service life of the electric drive system.

[0005] The present invention adopts the following technical solution: A gear oil pump includes a pump casing with a cylindrical inner cavity and an opening facing downwards; a gear ring coaxially disposed within the pump casing cavity and rotatably connected to the pump casing, with a drive gear 3 eccentrically meshed within the gear ring; an end cover disposed at the lower opening of the pump casing cavity, the end cover being circumferentially sealed and fixed to the pump casing; two sets of arc-shaped grooves symmetrically formed in the middle of the end cover cavity, the two sets of arc-shaped grooves corresponding to the meshing and disengagement points of the gear ring and the drive gear, respectively; the left and right sets of arc-shaped grooves are respectively connected to a suction groove and a discharge groove; the suction groove is connected to the bottom of the gearbox cavity; the discharge groove cavity is provided with a high-temperature discharge section and a low-temperature discharge section, the discharge outlet of the high-temperature discharge section is connected to the radiator outside the gearbox, and the discharge outlet of the low-temperature discharge section is connected to the gearbox cavity; both the high-temperature discharge section and the low-temperature discharge section are driven by a control structure disposed outside the end cover.

[0006] Furthermore, the front and rear sidewalls of the discharge groove are V-shaped, with the opening of the V-shaped discharge groove facing inward, and the outer connection of the V-shaped discharge groove having rounded corners.

[0007] Furthermore, the high-temperature discharge section includes an outer discharge cylinder disposed in the inner cavity of the discharge groove and coaxially disposed with the rounded corner of the discharge groove. The upper end of the outer discharge cylinder is sealed, and the lower end is open. The lower end opening of the outer discharge cylinder is connected to the radiator outside the gearbox. An outer discharge outlet is radially opened on the side wall of the outer discharge cylinder, and the outer discharge outlet is disposed corresponding to the rounded corner of the discharge groove. The upper end of the outer discharge cylinder passes through the front top wall of the pump casing through a vertical shaft and is connected to the front part of the control structure.

[0008] Furthermore, the low-temperature discharge section includes an inner discharge cylinder coaxially disposed within the receiving hole. The rear end of the inner discharge cylinder is sealed, and the front end is open. An inner discharge outlet is radially opened on the side wall of the inner discharge cylinder. The rear end of the inner discharge cylinder passes through the rear end of the pump casing, and the inner discharge cylinder is connected to the rear part of the control structure through a coaxially fixed horizontal shaft.

[0009] Furthermore, the control structure drive includes an inner drive unit connected to the inner discharge cylinder and an outer drive unit connected to the outer discharge cylinder, and the inner drive unit and the outer drive unit are connected to a temperature regulating unit, which is used to drive the inner discharge cylinder and the outer discharge cylinder to rotate through the inner drive unit and the outer drive unit respectively.

[0010] Furthermore, the temperature-regulating part includes a heat-conducting cylinder disposed between the inner and outer transmission parts. The heat-conducting cylinder is rotatably mounted on a support platform fixed to the right end of the pump casing. A thermal expansion part is also concentrically fixed inside the heat-conducting cylinder. The thermal expansion part includes an energy storage cylinder, which is cylindrical with an open top and a sealed bottom. A first flange with a guide hole along the axis is fixedly disposed on the upper end face of the energy storage cylinder. A plunger receiving cylinder is also inserted at the upper opening of the energy storage cylinder. A second flange is disposed on the upper end face of the plunger receiving cylinder. The plunger receiving cylinder is suspended above the energy storage cylinder, and the lower surface of the second flange of the plunger receiving cylinder is in close contact with the upper end face of the first flange. The outer surface of the plunger receiving cylinder and the inner surface of the energy storage cylinder form a sealed space. A plunger is also inserted inside the plunger receiving cylinder, and the upper end of the plunger extends upward to the guide hole opening protruding from the first flange. The sealed space formed by the outer surface of the plunger receiving cylinder and the inner surface of the energy storage cylinder is filled with paraffin wax. The plunger receiving cylinder is made of a flexible material.

[0011] Furthermore, the internal transmission part includes a first spur gear fixedly disposed at the rear end of the horizontal shaft, a second spur gear meshing at the upper end of the first spur gear, an inner guide rod coaxially disposed on the second spur gear, an internal transmission gear coaxially fixed at the front end of the inner guide rod, an inner gear ring sleeved on the inner transmission gear, and the inner gear ring slidingly disposed back and forth with the inner transmission gear; the inner gear ring is connected to the upper end of the plunger through the rear end of the connecting part.

[0012] Furthermore, the external transmission unit includes a fixed vertical shaft, a first bevel gear fixedly mounted on the upper end of the vertical shaft, a second bevel gear meshing with the rear side of the first bevel gear, an outer guide rod coaxially fixed to the rear end of the second bevel gear, an outer transmission gear coaxially fixed to the rear end of the outer guide rod, an outer gear ring sleeved on the outer transmission gear, and the outer gear ring slidingly back and forth with the outer transmission gear; the outer gear ring is connected to the upper end of the plunger through the front end of the connecting part; the inner guide rod and the outer guide rod are respectively rotatably inserted through supports fixed at the front and rear positions on the right side of the pump casing.

[0013] Furthermore, the inner drive gear and the outer drive gear are coaxially arranged via a support shaft, and the front and rear ends of the support shaft are rotatably connected to the outer drive gear and the inner drive gear, respectively; a limit spring is provided between the inner gear ring and the outer gear ring; the connecting part includes a pull rod fixed radially along the inner gear ring and the outer gear ring, a pull cylinder is rotatably provided at the lower end of each set of pull rods, a support rod is provided between the two sets of pull cylinders, and the front and rear ends of the support rod are rotatably connected to the corresponding pull cylinder; a sleeve is rotatably provided in the middle of the support rod, and a plunger is fixed on the lower side of the sleeve.

[0014] Furthermore, the front end of the horizontal shaft is fixed to the front part of the inner cavity of the inner discharge cylinder by a support rod. A piston hole is opened at the rear end of the inner discharge cylinder. A piston is sealed in the piston hole. The piston slides back and forth along the piston hole without rotating. A shaft hole is coaxially arranged between the piston and the center line. The horizontal shaft is coaxially arranged with the shaft hole and slides back and forth along the shaft hole without rotating. An opening adjustment part is rotatably connected to the rear part of the piston. The opening adjustment part is used to open both the inner discharge cylinder and the outer discharge cylinder simultaneously when the gear oil pump is started instantly.

[0015] Furthermore, the right side wall of the heat-conducting cylinder is provided with a receiving groove along the front and rear. The opening adjustment part includes an adjustment shaft fixedly installed vertically inside the receiving groove. An adjustment rod is provided radially rotatably on the adjustment shaft. A tensioning part is provided at the rear end of the adjustment rod. The tensioning part is used to drive the adjustment rod to move back and forth.

[0016] Furthermore, the stretching part includes an adjusting ring rotatably disposed at the rear end of the piston. An adjusting slide rail is fixedly disposed on the right side of the adjusting ring. An adjusting groove is formed in the middle of the adjusting slide rail along the front-rear position. A slider adapted to the adjusting groove is disposed in the adjusting groove. The slider slides left and right through the adjusting groove and the adjusting slide rail. An adjusting rod is fixedly disposed on the front end face of the slider. An adjusting shaft is rotatably disposed at the front end of the adjusting rod along the radial direction. The upper and lower ends of the adjusting shaft are fixed to the top and bottom walls of the receiving groove. A return spring is disposed between the left side of the slider and the bottom wall of the adjusting groove.

[0017] I. This invention, by setting a high-temperature discharge section and a low-temperature discharge section, allows the gear oil to be pumped directly from the bottom of the gearbox to the top without passing through the radiator outside the gearbox, instead contacting the top components (e.g., gears) to form direct lubrication or splash lubrication, when the electric drive system has been operating for a set time and the operating environment of the electric drive system has risen to the set temperature. In order to prevent the temperature from continuing to rise, the control structure drives the high-temperature discharge section to open and the low-temperature discharge section to close, so that the gear oil flows out to the radiator outside the gearbox and then re-enters the gearbox cavity.

[0018] II. By incorporating a temperature-regulating section, as the gear oil temperature gradually increases, the temperature-regulating section drives the inner discharge cylinder to rotate via the internal transmission section. Since the inner discharge outlet and guide hole on the side wall of the inner discharge cylinder are correspondingly arranged, during the rotation of the inner discharge cylinder, the inner discharge outlet and guide hole gradually misalign until the inner discharge outlet is sealed and blocked. At the same time, the temperature-regulating section drives the outer discharge cylinder to rotate via the external transmission section. Since the opening of the outer discharge outlet on the side wall of the outer discharge cylinder is correspondingly arranged with the rounded corner, the outer discharge outlet and the rounded corner gradually misalign until the outer discharge outlet is opened. The gear oil temperature rises, and the high-temperature gear oil flows out sequentially through the outer discharge outlet and the opening of the outer discharge cylinder into the radiator outside the gearbox for heat dissipation.

[0019] Third, the present invention provides an opening adjustment part so that when the gear oil support rod rotates counterclockwise, the inner discharge cylinder rotates counterclockwise and the outer discharge cylinder rotates clockwise; in order to keep the opening of the inner discharge outlet constant. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pump casing of the present invention; Figure 2 This is a schematic diagram of the toothed ring structure of the present invention; Figure 3 This is a schematic diagram of the structure of the second bevel gear of the present invention; Figure 4 This is a schematic diagram of the structure of the second spur gear of the present invention; Figure 5 This is a schematic diagram of the arc-shaped groove of the present invention; Figure 6 This is a schematic diagram of the structure of the horizontal axis of the present invention; Figure 7 This is a schematic diagram of the structure of the protrusion of the present invention; Figure 8 This is a schematic diagram of the structure of the enclosed space of the present invention; Figure 9 for Figure 8 Enlarged diagram of A in the middle; Figure 10 This is a schematic diagram of the piston structure of the present invention; Figure 11 This is a schematic diagram of the structure of the first bevel gear of the present invention; Figure 12 This is a schematic diagram of the flow guide hole structure of the present invention; Figure 13 This is a schematic diagram of the internal discharge outlet of the present invention.

[0021] In the diagram, 1. Pump casing; 2. Gear ring; 3. Drive gear; 4. Arc groove; 5. Suction groove; 6. Discharge groove; 7. High-temperature discharge section; 8. Low-temperature discharge section; 9. Rounded corner; 10. Protrusion; 11. Guide hole; 12. Outer discharge cylinder; 13. Outer discharge outlet; 14. Inner discharge cylinder; 15. Inner discharge outlet; 16. Horizontal shaft; 17. Plunger; 18. Sealed space; 19. First spur gear; 20. Second spur gear; 21. Inner guide rod; 22. Inner transmission gear; 23. Internal gear ring; 24. Vertical shaft; 25. First bevel gear; 26. Second bevel gear; 27. Outer guide rod. 28. Rod; 29. ​​External transmission gear; 30. External gear ring; 31. Support shaft; 32. Tie rod; 33. Pull cylinder; 34. Support rod; 35. Sleeve; 36. Heat conduction cylinder; 37. Energy storage cylinder; 38. First flange; 39. Plunger receiving cylinder; 40. Second flange; 41. Piston hole; 42. Piston; 43. Support rod; 44. Support platform; 45. Receiving groove; 46. Adjusting shaft; 47. Adjusting rod; 48. Adjusting ring; 49. Adjusting slide rail; 50. Slider; 51. Secondary piston; 52. Main piston; 53. Filter spring; 54. Limiting spring; 55. Return spring. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The gear oil pump of the present invention includes a pump casing 1 with a cylindrical inner cavity and an opening facing downwards; a gear ring 2 coaxially disposed within the inner cavity of the pump casing 1 and rotatably connected to the pump casing 1, a drive gear 3 eccentrically meshing within the gear ring 2; an end cover disposed at the lower opening of the inner cavity of the pump casing 1, the end cover being circumferentially sealed and fixed to the pump casing 1; two sets of arc-shaped grooves 4 symmetrically formed in the middle of the end cover cavity, the two sets of arc-shaped grooves 4 corresponding respectively to the meshing and disengagement points of the gear ring 2 and the drive gear 3; the left and right sets of arc-shaped grooves 4 respectively connect to a suction groove 5 and a discharge groove 6, the suction groove 5 and the discharge groove 6 respectively. The bottom of the gearbox cavity is open, and the discharge slot 6 cavity is provided with a high temperature discharge section 7 and a low temperature discharge section 8. The discharge port of the high temperature discharge section 7 is connected to the radiator outside the gearbox, and the discharge port of the low temperature discharge section is connected to the inner cavity of the gearbox. Both the high temperature discharge section 7 and the low temperature discharge section 8 are driven by a control structure located on the outside of the end cover. When the gear oil temperature is within the set range, only the discharge port of the high temperature discharge section 7 is connected to the radiator outside the gearbox; when the gear oil temperature is lower than the minimum value of the set range, the discharge port of the low temperature discharge section is connected to the inner cavity of the gearbox.

[0023] During operation, the input shaft connected to the drive gear 3 in the gearbox rotates, and the drive gear 3 drives the gear ring 2 to rotate, causing positive and negative pressures to be generated at the meshing and disengagement points of the gear ring 2 and the drive gear 3, respectively. Since the suction groove 5 at the disengagement point is connected to the bottom of the gearbox cavity, the gear oil at the bottom of the gearbox cavity is pumped to the discharge groove 6 by the gear oil pump. When the initial gear oil temperature is lower than the minimum value of the temperature set range, the control structure drives the outlet of the low-temperature discharge section 8 to open, and the gear oil bypasses the radiator outside the gearbox and flows directly from the gearbox. The gear oil is pumped from the bottom of the gearbox cavity to the top and comes into contact with the top components (e.g., gears) to form direct lubrication or splash lubrication. After the electric drive system has been working for a set time, the working environment of the electric drive system rises to the set temperature. In order to prevent the temperature from continuing to rise, the control structure drives the outlet of the high temperature discharge section 7 to open and the outlet of the low temperature discharge section to close, so that the gear oil flows out to the radiator outside the gearbox and then re-enters the gearbox cavity. Under the action of gravity, some gear oil accumulates in the set area at the bottom of the gearbox cavity. Since the suction groove 5 is connected to the bottom of the gearbox cavity.

[0024] In this embodiment, the front sidewall and the rear sidewall of the discharge groove 6 are V-shaped, and the opening of the V-shaped discharge groove 6 faces inward, and the outer connection of the V-shaped discharge groove 6 is rounded with a rounded corner 9.

[0025] In this embodiment, a protrusion 10 is provided at the rear end of the pump housing 1 corresponding to the rear side wall of the discharge groove 6. A receiving hole is provided on the rear side wall of the discharge groove 6. The receiving hole extends rearward into the protrusion 10. A guide hole 11 is provided radially downward along the receiving hole in the protrusion 10. The guide hole 11 makes the discharge groove 6 communicate with the external space of the pump housing 1, so that the low temperature gear oil circulates in the gearbox through the guide hole 11.

[0026] In this invention, the high-temperature discharge section 7 includes an outer discharge cylinder 12 disposed within the inner cavity of the discharge groove 6 and coaxially disposed with the rounded corner 9 of the discharge groove 6. The upper end of the outer discharge cylinder 12 is sealed, and the lower end is open, with the lower end opening of the outer discharge cylinder 12 communicating with the radiator outside the gearbox. An outer discharge outlet 13 is radially provided on the side wall of the outer discharge cylinder 12, and the outer discharge outlet 13 is correspondingly disposed with the rounded corner 9 of the discharge groove 6. The upper end of the outer discharge cylinder 12 passes through the front top wall of the pump housing 1 via a vertical shaft 24 and is connected to the front part of the control structure. In the initial state, that is, when the gear oil temperature is lower than the minimum value of the temperature setting range, the rounded corner 9 is provided at the opening of the outer discharge outlet 13 to keep the outer discharge outlet 13 closed, and the low-temperature gear oil cannot enter the outer discharge cylinder 12 through the outer discharge outlet 13 and enter the radiator outside the gearbox.

[0027] In this invention, the low-temperature discharge section 8 includes an inner discharge cylinder 14 coaxially disposed within a receiving hole. The rear end of the inner discharge cylinder 14 is sealed, and the front end is open. An inner discharge outlet 15 is radially provided on the side wall of the inner discharge cylinder 14, and the inner discharge outlet 15 is correspondingly disposed with the guide hole 11. The rear end of the inner discharge cylinder 14 passes through the rear end of the pump housing 1, and the inner discharge cylinder 14 is connected to the rear part of the control structure through a coaxially fixed horizontal shaft 16. In the initial state, that is, when the gear oil temperature is lower than the minimum value of the temperature setting range, the guide hole 11 is correspondingly disposed with the inner discharge outlet 15, and the low-temperature gear oil flows into the gearbox through the front opening of the inner discharge cylinder 14, the inner discharge outlet 15, and the guide hole 11 in sequence, so that the gear oil is directly pumped from the bottom of the gearbox cavity to the top and comes into contact with the top component (e.g., gear) to form direct lubrication or splash lubrication.

[0028] In this invention, the control structure drive includes an inner drive unit connected to the inner discharge cylinder 14 and an outer drive unit connected to the outer discharge cylinder 12, and the inner drive unit and the outer drive unit are connected to a temperature-regulating unit. The temperature-regulating unit is used to drive the inner discharge cylinder 14 and the outer discharge cylinder 12 to rotate through the inner drive unit and the outer drive unit respectively.

[0029] During operation, as the gear oil temperature gradually increases, the temperature control unit drives the inner discharge cylinder 14 to rotate via the internal transmission unit. Since the inner discharge outlet 15 and the guide hole 11 on the side wall of the inner discharge cylinder 14 are correspondingly set, during the rotation of the inner discharge cylinder 14, the inner discharge outlet 15 and the guide hole 11 gradually shift until the inner discharge outlet 15 is sealed and blocked. At the same time, the temperature control unit drives the outer discharge cylinder 12 to rotate via the external transmission unit. Since the opening of the outer discharge outlet 13 on the side wall of the outer discharge cylinder 12 is correspondingly set with the rounded corner 9, the outer discharge outlet 13 and the rounded corner 9 gradually shift until the outer discharge outlet 13 is opened. The gear oil temperature rises and the high-temperature gear oil flows out through the outer discharge outlet 13 and the opening of the outer discharge cylinder 12 in sequence into the radiator outside the gearbox for heat dissipation.

[0030] In this embodiment, the temperature-regulating part includes a heat-conducting cylinder 35 disposed between the inner transmission part and the outer transmission part. The heat-conducting cylinder 35 is rotatably mounted on the right end support platform 43 fixed to the pump housing 1. A thermal expansion part is also concentrically fixed inside the heat-conducting cylinder 35. The thermal expansion part includes an energy storage cylinder 36, which is cylindrical with an open top and a sealed bottom. A first flange 37 with a guide hole along the axis is fixedly disposed on the upper end face of the energy storage cylinder 36. A plunger receiving cylinder 38 is also inserted into the upper opening of the energy storage cylinder 36. A second flange 39 is disposed on the upper end face of the plunger receiving cylinder 38. The plunger housing 38 is suspended above the energy storage cylinder 36, and the lower surface of the second flange 39 of the plunger housing 38 is in close contact with the upper end face of the first flange 37. The outer surface of the plunger housing 38 and the inner surface of the energy storage cylinder 36 form a sealed space 18. A plunger 17 is also inserted inside the plunger housing 38, and the upper end of the plunger 17 extends upward to the opening of the guide hole protruding from the first flange 37. The sealed space 18 formed by the outer surface of the plunger housing 38 and the inner surface of the energy storage cylinder 36 is filled with paraffin wax. The plunger housing 38 is made of a flexible material, such as rubber.

[0031] During operation, when the gear oil temperature rises, the paraffin wax begins to melt. Since the volume of liquid paraffin wax is greater than that of solid paraffin wax, the liquid paraffin wax in the sealed space 18 squeezes the plunger housing 38. The plunger housing 38 transmits pressure to the lower part of the plunger 17, thereby driving the plunger 17 to move upward and drive the inner and outer transmission parts.

[0032] In this invention, the internal transmission part includes a first spur gear 19 fixedly disposed at the rear end of the horizontal shaft 16, a second spur gear 20 meshing at the upper end of the first spur gear 19, an inner guide rod 21 coaxially disposed on the second spur gear 20, an internal transmission gear 22 coaxially fixed at the front end of the inner guide rod 21, an internal gear ring 23 sleeved on the inner transmission gear 22, and the internal gear ring 23 slidingly disposed with the inner transmission gear 22; the internal gear ring 23 is connected to the upper end of the plunger 17 through the rear end of the connecting part.

[0033] In this invention, the external transmission unit includes a fixedly mounted vertical shaft 24, a first bevel gear 25 fixedly mounted on the upper end of the vertical shaft 24, a second bevel gear 26 meshing with the rear side of the first bevel gear 25, an outer guide rod 27 coaxially fixed to the rear end of the second bevel gear 26, an outer transmission gear 28 coaxially fixed to the rear end of the outer guide rod 27, an outer gear ring 29 sleeved on the outer transmission gear 28, and the outer gear ring 29 and the outer transmission gear 28 sliding back and forth; the outer gear ring 29 is connected to the upper end of the plunger 17 through the front end of the connecting part; the inner guide rod 21 and the outer guide rod 27 are respectively rotatably inserted through supports fixed at the front and rear positions on the right side of the pump housing 1.

[0034] In this embodiment, the inner drive gear 22 and the outer drive gear 28 are coaxially arranged through the support shaft 30, and the front and rear ends of the support shaft 30 are respectively rotatably connected to the outer drive gear 28 and the inner drive gear 22; a limit spring 53 is provided between the inner gear ring 23 and the outer gear ring 29.

[0035] In this embodiment, the connecting part includes pull rods 31 that are radially fixed along the inner gear ring 23 and the outer gear ring 29 respectively. Each set of pull rods 31 has a pull tube 32 rotatably arranged at the lower end. A support rod 33 is arranged between the two sets of pull tubes 32. Both ends of the support rod 33 are rotatably connected to the corresponding pull tube 32. A sleeve 34 is rotatably arranged in the middle of the support rod 33. A plunger 17 is fixed on the lower side of the sleeve 34.

[0036] During operation, when the plunger 17 moves up and down, the sleeve 34 connected to the plunger 17 moves up and down, and the sleeve 34 drives the support rod 33 to move up and down. The pull cylinders 32, which are respectively set at both ends of the support rod 33, move up and down. The pull rod 31, which is connected to the pull cylinder 32, drives the corresponding internal gear ring 23 and external gear ring 29 to rotate. The internal transmission gear 22 and the external transmission gear 28, which mesh with the internal gear ring 23 and the external gear ring 29 respectively, rotate, thereby driving the second spur gear 20 and the second bevel gear 26, which are respectively connected to the internal transmission gear 22 and the external transmission gear 28, to rotate. The second spur gear 20 drives the inner discharge cylinder 14 to rotate through the meshing first spur gear 19, and the second bevel gear 26 drives the outer discharge cylinder 12 to rotate through the first bevel gear 25.

[0037] In actual pumping processes, the viscosity of gear oil increases significantly in extremely low-temperature environments. Furthermore, due to the instantaneous increase in torque when the gear oil pump starts, the pressure in the discharge tank 6 increases rapidly when pumping high-viscosity gear oil. This also increases the resistance to the rotation of the drive gear 3 and the gear ring 2, which accelerates the wear rate of the drive gear 3 and the gear ring 2, and even increases the risk of tooth breakage of the drive gear 3 or the gear ring 2. In order to stabilize the pressure in the discharge tank 6,

[0038] In this invention, the front end of the horizontal shaft 16 is fixed to the front part of the inner cavity of the inner discharge cylinder 14 by the support rod 42. The rear end of the inner discharge cylinder 14 is provided with a piston hole 40. A piston 41 is sealed in the piston hole 40. The piston 41 slides back and forth along the piston hole 40 without rotating. A shaft hole is provided coaxially with the center line of the piston 41. The horizontal shaft 16 is coaxial with the shaft hole and slides back and forth along the shaft hole without rotating. An opening adjustment part is rotatably connected to the rear part of the piston 41. The opening adjustment part is used to open the inner discharge cylinder 14 and the outer discharge cylinder 12 simultaneously when the gear oil pump is started instantly.

[0039] In this embodiment, the piston 41 includes a secondary piston 50 and a main piston 51 arranged in front and behind. The secondary piston 50 and the main piston 51 are equipped with filter springs 52. When the pressure of the gear oil in the discharge groove 6 fluctuates slightly, the gear oil converts the energy in a suitable amount of gear oil into elastic potential energy through the filter springs 52, so that the opening adjustment part only opens when the pressure in the discharge groove 6 rises rapidly.

[0040] In this embodiment, a receiving groove 44 is provided along the front and rear sides of the right side wall of the heat-conducting cylinder 35, and the opening adjustment part includes... An adjusting shaft 45 is fixedly installed vertically inside the receiving groove 44. An adjusting rod 46 is radially rotatably provided on the adjusting shaft 45. A tensioning part is provided at the rear end of the adjusting rod 46. The tensioning part is used to drive the adjusting rod 46 to move back and forth. In this embodiment, the stretching part includes an adjusting ring 47 rotatably disposed at the rear end of the piston 41. An adjusting slide rail 48 is fixedly disposed on the right side of the adjusting ring 47. An adjusting groove is provided in the middle of the adjusting slide rail 48 along the front-rear position. A slider 49 adapted to the adjusting groove is disposed in the adjusting groove. The slider 49 slides left and right with the adjusting slide rail 48 through the adjusting groove. An adjusting rod 46 is fixedly disposed on the front end face of the slider 49. An adjusting shaft 45 is rotatably disposed at the front end of the adjusting rod 46 along the radial direction. The upper and lower ends of the adjusting shaft 45 are fixed to the top and bottom walls of the receiving groove 44. A return spring 54 is disposed between the left side of the slider 49 and the bottom wall of the adjusting groove.

[0041] As the plunger 17 moves upward, driving the internal gear ring 23 and the external gear ring 29 to rotate, the inner discharge cylinder 14 and the outer discharge cylinder 12 rotate clockwise (observed from the direction of the arrow in the figure). At this time, the inner discharge outlet 15 gradually closes and the outer discharge outlet 13 gradually opens. When the support rod 33 rotates counterclockwise, the inner discharge cylinder 14 rotates counterclockwise and the outer discharge cylinder 12 rotates clockwise. In order to keep the opening of the inner discharge outlet 15 unchanged.

[0042] In this embodiment, the width of the inner outlet 15 in the left-right direction is greater than the width of the guide hole 11 in the left-right direction, and in the initial position, the right edge of the inner outlet 15 is flush with the right edge of the guide hole 11.

[0043] During operation, when the pressure inside the discharge tank 6 rises rapidly, the gear oil pressure drives the piston 41 to move backward. The backward movement of the piston 41 drives the stretching part to move backward. Since the stretching part is connected to the heat-conducting cylinder 35 circumferentially via the adjusting rod 46, the backward movement of the stretching part drives the heat-conducting cylinder 35 to rotate. The rotation of the heat-conducting cylinder 35 drives the support rod 33 to rotate. The rotation of the support rod 33 drives the internal gear ring 23 and the external gear ring 29 to move towards each other in opposite directions. The slider 49 moves to the left and simultaneously squeezes the return spring 54. At this time, the inner discharge cylinder 14 rotates counterclockwise, and the outer discharge cylinder 12 rotates clockwise. When the width of the inner discharge outlet 15 in the left-right direction is greater than the width of the guide hole 11 in the left-right direction, the inner discharge... The outlet 15 maintains its maximum opening, and due to the clockwise rotation of the outer discharge cylinder 12, the outer discharge outlet 13, which was originally set to correspond with the rounded corner 9, rotates to be misaligned with the rounded corner 9 and thus gradually opens. The high-pressure gear oil in the discharge groove 6 is discharged from the inner discharge outlet 15 and the outer discharge outlet 13 at the same time, and the gear oil pressure drops rapidly. When the gear oil pressure returns to the normal range, the reset spring 54 drives the slider 49 to move to the right. At the same time, the slider 49 drives the adjusting rod 46 to move to the right, and the heat conduction cylinder 35 resets clockwise. Since the length of the adjusting rod 46 is fixed, the adjusting rod 46 drives the adjusting slide rail 48 to move downward through the slider 49, and the main piston 51 and the auxiliary piston 50 connected to the adjusting slide rail 48 reset to their initial positions.

Claims

1. A gear oil pump, characterized in that: The pump casing includes a cylindrical inner cavity with an opening facing downwards. A gear ring is coaxially mounted within the inner cavity of the pump casing and rotatably connected to it. A drive gear 3 is eccentrically meshed within the gear ring. An end cover is located at the lower opening of the inner cavity of the pump casing. The end cover is circumferentially sealed and fixed to the pump casing. Two sets of arc-shaped grooves are symmetrically opened in the middle of the end cover cavity. The two sets of arc-shaped grooves correspond to the meshing and disengagement points of the gear ring and the drive gear, respectively. The left and right sets of arc-shaped grooves are respectively connected to a suction groove and a discharge groove. The suction groove is connected to the bottom of the inner cavity of the gearbox. The inner cavity of the discharge groove is provided with a high-temperature discharge section and a low-temperature discharge section. The outlet of the high-temperature discharge section is connected to the radiator outside the gearbox, and the outlet of the low-temperature discharge section is connected to the inner cavity of the gearbox. Both the high-temperature discharge section and the low-temperature discharge section are driven by a control structure located on the outside of the end cover.

2. The gear oil pump according to claim 1, characterized in that: The front and rear sidewalls of the discharge trough are V-shaped, with the opening of the V-shaped discharge trough facing inward and the outer connection of the V-shaped discharge trough having rounded corners.

3. The gear oil pump according to claim 2, characterized in that: The high-temperature discharge section includes an outer discharge cylinder disposed in the inner cavity of the discharge groove and coaxially arranged with the rounded corner of the discharge groove. The upper end of the outer discharge cylinder is sealed, and the lower end is open. The lower end opening of the outer discharge cylinder is connected to the radiator outside the gearbox. An outer discharge outlet is radially opened on the side wall of the outer discharge cylinder, and the outer discharge outlet is arranged corresponding to the rounded corner of the discharge groove. The upper end of the outer discharge cylinder passes through the front top wall of the pump casing through a vertical shaft and is connected to the front part of the control structure.

4. The gear oil pump according to claim 1, characterized in that: The low-temperature discharge section includes an inner discharge cylinder coaxially disposed within the receiving hole. The rear end of the inner discharge cylinder is sealed, and the front end is open. An inner discharge outlet is radially provided on the side wall of the inner discharge cylinder. The rear end of the inner discharge cylinder passes through the rear end of the pump casing, and the inner discharge cylinder is connected to the rear part of the control structure through a coaxially fixed horizontal shaft.

5. The gear oil pump according to claim 5, characterized in that: The control structure drive includes an inner drive unit connected to the inner discharge cylinder and an outer drive unit connected to the outer discharge cylinder. The inner drive unit and the outer drive unit are connected to a temperature regulating unit, which is used to drive the inner discharge cylinder and the outer discharge cylinder to rotate through the inner drive unit and the outer drive unit respectively.

6. The gear oil pump according to claim 6, characterized in that: The temperature-regulating part includes a heat-conducting cylinder disposed between the inner and outer transmission parts. The heat-conducting cylinder is rotatably mounted on a support platform fixed to the right end of the pump casing. A thermal expansion part is also concentrically fixed inside the heat-conducting cylinder. The thermal expansion part includes an energy storage cylinder, which is cylindrical with an open top and a sealed bottom. A first flange with a guide hole along the axis is fixedly disposed on the upper end face of the energy storage cylinder. A plunger receiving cylinder is also inserted at the upper opening of the energy storage cylinder. A second flange is disposed on the upper end face of the plunger receiving cylinder. The plunger receiving cylinder is suspended above the energy storage cylinder, and the lower surface of the second flange of the plunger receiving cylinder is in close contact with the upper end face of the first flange. The outer surface of the plunger receiving cylinder and the inner surface of the energy storage cylinder form a sealed space. A plunger is also inserted inside the plunger receiving cylinder, and the upper end of the plunger extends upward to the guide hole opening protruding from the first flange. The sealed space formed by the outer surface of the plunger receiving cylinder and the inner surface of the energy storage cylinder is filled with paraffin wax. The plunger receiving cylinder is made of a flexible material.

7. The gear oil pump according to claim 6, characterized in that: The internal transmission unit includes a first spur gear fixedly mounted at the rear end of the horizontal shaft, a second spur gear meshing at the upper end of the first spur gear, an inner guide rod coaxially mounted on the second spur gear, an internal transmission gear coaxially fixed at the front end of the inner guide rod, an inner gear ring sleeved on the inner transmission gear, and the inner gear ring sliding back and forth with the inner transmission gear; the inner gear ring is connected to the upper end of the plunger through the rear end of the connecting part.

8. The gear oil pump according to claim 8, characterized in that: The external transmission unit includes a fixed vertical shaft, a first bevel gear fixedly mounted on the upper end of the vertical shaft, a second bevel gear meshing with the rear side of the first bevel gear, an outer guide rod fixedly coaxially at the rear end of the second bevel gear, an outer transmission gear fixedly coaxially at the rear end of the outer guide rod, an outer gear ring sleeved on the outer transmission gear, and the outer gear ring slidingly back and forth with the outer transmission gear; the outer gear ring is connected to the upper end of the plunger through the front end of the connecting part; the inner guide rod and the outer guide rod are respectively rotatably mounted through supports fixed at the front and rear positions on the right side of the pump casing.

9. The gear oil pump according to claim 9, characterized in that: The internal transmission gear and the external transmission gear are coaxially arranged via a support shaft, and the front and rear ends of the support shaft are rotatably connected to the external transmission gear and the internal transmission gear, respectively; a limit spring is provided between the internal gear ring and the external gear ring; the connecting part includes a pull rod fixed radially along the internal gear ring and the external gear ring, a pull cylinder is rotatably provided at the lower end of each set of pull rods, a support rod is provided between the two sets of pull cylinders, and the front and rear ends of the support rod are rotatably connected to the corresponding pull cylinder; a sleeve is rotatably provided in the middle of the support rod, and a plunger is fixed on the lower side of the sleeve.

10. The gear oil pump according to claim 4, characterized in that: The front end of the horizontal shaft is fixed to the front of the inner cavity of the inner discharge cylinder by a support rod. A piston hole is opened at the rear end of the inner discharge cylinder. A piston is sealed in the piston hole. The piston slides back and forth along the piston hole without rotating. A shaft hole is coaxially arranged between the piston and the center line. The horizontal shaft is coaxial with the shaft hole and slides back and forth along the shaft hole without rotating. An opening adjustment part is rotatably connected to the rear of the piston. The opening adjustment part is used to open both the inner discharge cylinder and the outer discharge cylinder at the same time when the gear oil pump is started instantly.

11. The gear oil pump according to claim 6, characterized in that: The heat-conducting cylinder has a receiving groove on the right side wall along the front and back. The opening adjustment part includes an adjustment shaft fixedly installed at the top and bottom in the receiving groove. An adjustment rod is radially rotatably installed on the adjustment shaft. A tensioning part is provided at the rear end of the adjustment rod. The tensioning part is used to drive the adjustment rod to move back and forth.

12. The gear oil pump according to claim 11, characterized in that: The stretching part includes an adjusting ring rotatably mounted at the rear end of the piston. An adjusting slide rail is fixedly mounted on the right side of the adjusting ring. An adjusting groove is formed in the middle of the adjusting slide rail along its front-rear position. A slider adapted to the adjusting groove is mounted in the adjusting groove. The slider slides left and right along the adjusting slide rail via the adjusting groove. An adjusting rod is fixedly mounted on the front end of the slider. An adjusting shaft is rotatably mounted on the front end of the adjusting rod along its radial direction. The upper and lower ends of the adjusting shaft are fixed to the top and bottom walls of the receiving groove. A return spring is mounted between the left side of the slider and the bottom wall of the adjusting groove.

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