Multi-connected lubricating oil pump

Abstract

The invention provides a multi-connected lubricating oil pump, and relates to the technical field of oil pumps. The multi-union lubricating oil pump comprises an oil delivery pump shell, a pressure limiting valve, an oil return pump shell and a transmission shaft. The oil scavenger pump shell and the oil delivery pump shell are connected together, so that the oil scavenger pump has the oil pumping function and the oil returning function at the same time, the inner rotor, the outer rotor and four oil pumping structures in the oil scavenger pump shell can be driven through one set of power input, and the oil scavenger pump is compact in structure, small in occupied space, low in cost and high in reliability; a plurality of oil return cavities in the oil return pump shell do not interfere with one another, the oil return pump is provided with a plurality of inlets and an outlet, the working condition requirement that the gas content in different oil return channels is inconsistent is met, a set of fixed partition plates and two sets of sliding partition plates are adopted in the oil return pump shell, the interior of the oil return pump shell is divided into four oil return cavities, the problem of engine oil leakage of a multi-union pump is avoided, and the service life of the oil return pump is prolonged. And the volume of the pump is compressed.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumps, in particular to a multiple lubricating oil pump. Background Art

[0002] The function of the oil pump is to pressurize the oil to a certain pressure and then force it to the moving surfaces of the engine parts. The oil pump is the power source for the oil circulation in the engine lubrication system. The oil pump is installed at the bottom of the engine cylinder. When it rotates, it pressurizes the oil in the oil pan and discharges it to the lubrication oil circuit. It is widely used in the fields of automobiles, aviation, etc.

[0003] Dry sump technology originates from racing. It can improve the lubrication capacity and handling performance of the engine and increase the power of the racing car by using an improved lubrication system. At the same time, due to its excellent performance and adaptability to various driving conditions, it can be applied to military vehicles or other special vehicles.

[0004] In the existing technology, the oil pump has certain drawbacks. On the one hand, due to the increasingly complex structure of automobile engines and the intricate lubrication oil circuits, the traditional engine lubrication system uses multiple single oil pumps to work simultaneously to meet the needs of engine operation. On the other hand, sports cars mostly use dry sump technology, the engine structure is more compact, the oil pump layout space is more cramped, and the lubrication oil circuit is more complicated.

[0005] In summary, the existing traditional oil pumps are difficult to meet the oil circulation requirements of the small space and large displacement of the dry oil sump, and the traditional combination of multiple single oil pumps is costly and not applicable. It is necessary to develop a multi-lubricating oil pump in the hope of solving the above problems. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a multi-connected lubricating oil pump, which solves the problem that the existing traditional oil pump is difficult to meet the oil circulation requirements of a small space and large displacement of a dry oil sump.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a multi-connected lubricating oil pump, comprising an oil feed pump housing, a pressure limiting valve, an oil return pump housing and a transmission shaft, the oil feed pump housing being fixedly connected to the front wall of the oil return pump housing, the oil feed pump housing and the oil return pump housing being fixed by bolts, the pressure limiting valve being arranged on the front wall of the oil feed pump housing, the transmission shaft being rotatably connected to the inside of the oil feed pump housing, the front end of the transmission shaft penetrating the front wall of the oil feed pump housing and extending to the front side of the oil feed pump housing, the rear end of the transmission shaft penetrating the rear wall of the oil feed pump housing and the front wall of the oil return pump housing in sequence and extending into the inside of the oil return pump housing, the outer wall of the transmission shaft being located inside the oil feed pump housing and being fixedly connected with an inner rotor, the outer wall of the inner rotor being sleeved with an outer rotor, and the transmission shaft extending into the inside of the oil return pump housing. One end of the oil pump is fixedly connected to a driving shaft, and the rear end of the driving shaft is rotatably connected to the rear wall inside the oil return pump housing, and a driven shaft is rotatably connected to the inside of the oil return pump housing and located on the left side of the driving shaft. The upper wall of the oil pump housing and close to the front wall are sequentially provided with a first oil inlet and a second oil inlet in a left and right distribution, and the left and right side walls of the oil pump housing are respectively provided with a group of oil pump outlets, and the two groups of oil pump outlets are both connected to the inside of the oil pump housing, and the upper wall of the oil return pump housing and close to the rear wall are sequentially provided with a third oil inlet and a fourth oil inlet in a left and right distribution, and the right wall of the oil return pump housing is sequentially provided with a fifth oil inlet and a sixth oil inlet in a front-to-back distribution, and the left wall of the oil return pump housing is sequentially provided with a return oil outlet, a seventh oil inlet and an eighth oil inlet in a front-to-back distribution.

[0008] Preferably, the inner wall of the return oil pump housing is fixedly connected to a fixed partition, and the inner wall of the return oil pump housing is slidably connected to a first sliding partition and a second sliding partition respectively located on the front and rear sides of the fixed partition. The return oil pump housing is divided into a first oil return chamber, a second oil return chamber, a third oil return chamber and a fourth oil return chamber which are distributed from back to front in sequence by the first sliding partition, the fixed partition and the second sliding partition, and a first oil pumping structure, a second oil pumping structure, a third oil pumping structure and a fourth oil pumping structure are respectively arranged in the first oil return chamber, the second oil return chamber, the third oil return chamber and the fourth oil return chamber.

[0009] Preferably, the third oil inlet and the fourth oil inlet are both connected to the interior of the first oil return chamber, the sixth oil inlet and the eighth oil inlet are both connected to the interior of the second oil return chamber, the fifth oil inlet and the seventh oil inlet are both connected to the interior of the third oil return chamber, and the oil return pump outlet, the first oil inlet, and the second oil inlet are all connected to the interior of the fourth oil return chamber.

[0010] Preferably, a first oil hole is provided on the inner wall of the first sliding partition and located in the middle position in the left-right direction, a first inlet which is communicated with the interior of the first oil hole is provided on the rear wall of the first sliding partition and close to the lower wall, a first outlet which is communicated with the interior of the first oil hole is provided on the front wall of the first sliding partition and close to the upper wall, a second oil hole is provided on the inner wall of the fixed partition and located in the middle position in the left-right direction, a second inlet which is communicated with the interior of the second oil hole is provided on the rear wall of the fixed partition and close to the lower wall, a second outlet which is communicated with the interior of the second oil hole is provided on the front wall of the fixed partition and close to the upper wall, a third oil hole is provided on the inner wall of the second sliding partition and located in the middle position in the left-right direction, a third inlet which is communicated with the interior of the third oil hole is provided on the rear wall of the second sliding partition and close to the lower wall, a third outlet which is communicated with the interior of the third oil hole is provided on the front wall of the second sliding partition and close to the upper wall, and a defoaming structure is provided inside the first oil hole, the second oil hole and the third oil hole.

[0011] Preferably, the first oil pump structure includes two groups of first gears, and the two groups of first gears are fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft respectively. The two groups of first gears are located inside the first oil return chamber and the circumferential outer walls are meshed with each other. The upper part of the mutual meshing point of the two groups of first gears is the first oil suction area, and the lower part of the mutual meshing point of the two groups of first gears is the first compression area, and the first inlet is connected to the first compression area.

[0012] Preferably, the second oil pump structure includes two groups of second gears, and the two groups of second gears are respectively fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft. The two groups of second gears are both located inside the second oil return chamber and the circumferential outer walls are meshed with each other. The second oil suction area is above the meshing point of the two groups of second gears, and the second compression area is below the meshing point of the two groups of second gears, and the second inlet is connected to the second compression area.

[0013] Preferably, the third oil pumping structure includes two groups of third gears, and the two groups of third gears are respectively fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft. The two groups of third gears are both located inside the third oil return chamber and the circumferential outer walls are meshed with each other. The third oil suction area is above the mutual meshing point of the two groups of third gears, and the third compression area is below the mutual meshing point of the two groups of third gears, and the third inlet is connected to the third compression area.

[0014] Preferably, the fourth oil pump structure includes two groups of fourth gears, and the two groups of fourth gears are respectively fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, and the two groups of fourth gears are both located inside the fourth oil return chamber and the circumferential outer walls are meshed with each other, and the fourth oil suction area is above the mutual meshing point of the two groups of fourth gears, and the fourth compression area is below the mutual meshing point of the two groups of fourth gears, and the first outlet, the second outlet and the third outlet are all connected to the fourth oil suction area through pipelines.

[0015] Preferably, the defoaming structure comprises three groups of defoaming nets, and the three groups of defoaming nets are detachably connected to the inside of the first oil-passing hole, the second oil-passing hole and the third oil-passing hole respectively.

[0016] Preferably, a connecting hole is provided at the rear end of the transmission shaft, and a connecting head is provided at the front end of the driving shaft. The outer wall of the connecting head is adapted to the size of the inner wall of the connecting hole. The inner wall of the connecting hole is provided with multiple groups of key slots equally distributed around the circumference, and the circumferential outer wall of the connecting head is provided with multiple groups of flat keys adapted to the key slots.

[0017] The present invention provides a multi-connected lubricating oil pump. It has the following beneficial effects:

[0018] 1. Compared with the prior art, the multi-connected lubricating oil pump connects the oil return pump housing with the oil delivery pump housing, so that it has both oil pumping and oil return functions. Through a set of power input, it can drive the inner rotor, outer rotor and four sets of oil pumping structures in the oil return pump housing. It has a compact structure, small space occupancy, low cost and high reliability.

[0019] 2. Compared with the prior art, the multiple oil return chambers in the oil return pump housing of the multi-connected lubricating oil pump do not interfere with each other. The oil return pump has multiple inlets and one outlet, which can meet the working conditions of inconsistent gas content in different oil return channels. A set of fixed baffles and two sets of sliding baffles are used in the oil return pump housing to divide the interior of the oil return pump housing into four oil return chambers, which avoids the problem of oil leakage in the multi-connected pump and compresses the volume of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention from the left front perspective;

[0021] Figure 2 It is a schematic diagram of the overall structure of the present invention from the right front perspective;

[0022] Figure 3 It is a partial cross-sectional view of the oil delivery pump housing, the oil return pump housing, the transmission shaft, the inner rotor, the outer rotor and four groups of oil pumping structures of the present invention;

[0023] Figure 4 It is a partial cross-sectional view of the top surface of the oil delivery pump housing, the oil return pump housing, and the transmission shaft connection structure of the present invention;

[0024] Figure 5 It is a top cross-sectional view of a local structure of a transmission shaft of the present invention;

[0025] Figure 6 It is a top view schematic diagram of the local structure of the driving shaft of the present invention;

[0026] Figure 7 It is a side sectional view of the first sliding partition of the present invention;

[0027] Figure 8 It is a side sectional view of a fixed partition of the present invention;

[0028] Fig. 9 It is a side sectional view of the second sliding plate of the present invention.

[0029] Among them, 1. Oil delivery pump housing; 2. Oil return pump housing; 3. Transmission shaft; 301. Connection hole; 302. Keyway; 4. Pressure limiting valve; 5. Oil delivery pump outlet; 6. Oil return pump outlet; 7. First oil inlet; 8. Second oil inlet; 9. Third oil inlet; 10. Fourth oil inlet; 11. Fifth oil inlet; 12. Sixth oil inlet; 13. Seventh oil inlet; 14. Eighth oil inlet; 15. Inner rotor; 16. Outer rotor; 17. Driving shaft; 1701. Connector; 1702. Flat key; 18. Driven shaft; 19. First gear; 20. The second gear; 21. The third gear; 22. The fourth gear; 23. The first sliding partition; 2301. The first oil hole; 2302. The first inlet; 2303. The first outlet; 24. The fixed partition; 2401. The second oil hole; 2402. The second inlet; 2403. The second outlet; 25. The second sliding partition; 2501. The third oil hole; 2502. The third inlet; 2503. The third outlet; 26. The first oil return chamber; 27. The second oil return chamber; 28. The third oil return chamber; 29. ​​The fourth oil return chamber; 30. The defoaming net. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figures 1 to 9As shown, the embodiment of the present invention provides a multi-connected lubricating oil pump, including an oil pump housing 1, a pressure limiting valve 4, an oil return pump housing 2 and a transmission shaft 3. The oil pump housing 1 is fixedly connected to the front wall of the oil return pump housing 2, and the oil pump housing 1 and the oil return pump housing 2 are fixed by bolts. The pressure limiting valve 4 is arranged on the front wall of the oil pump housing 1, and the transmission shaft 3 is rotatably connected to the inside of the oil pump housing 1. The front end of the transmission shaft 3 penetrates the front wall of the oil pump housing 1 and extends to the front side of the oil pump housing 1. The rear end of the transmission shaft 3 penetrates the rear wall of the oil pump housing 1 and the front wall of the oil return pump housing 2 in sequence and extends into the inside of the oil return pump housing 2. The outer wall of the transmission shaft 3 and the inside of the oil pump housing 1 are fixedly connected with an inner rotor 15, and the outer wall of the inner rotor 15 is sleeved with an outer rotor 16. The inner rotor 15, the outer rotor 16, the transmission shaft 3 and the oil pump housing 1 constitute a cycloid rotor pump, which is used to actively pump oil for the engine lubrication system.

[0033] In order to achieve the purpose of compact structure, one end of the transmission shaft 3 extending into the interior of the oil return pump housing 2 is fixedly connected with the driving shaft 17, the rear end of the driving shaft 17 is rotatably connected to the inner rear wall of the oil return pump housing 2, and the driven shaft 18 is rotatably connected to the interior of the oil return pump housing 2 and located on the left side of the driving shaft 17, a connecting hole 301 is arranged at the rear end of the transmission shaft 3, and a connecting head 1701 is arranged at the front end of the driving shaft 17, the outer wall of the connecting head 1701 is adapted to the size of the inner wall of the connecting hole 301, the inner wall of the connecting hole 301 is provided with multiple groups of key grooves 302 equally distributed in a circle, and the outer wall of the circumference of the connecting head 1701 is provided with multiple groups of flat keys 1702 adapted to the key grooves 302, and the torque is transmitted between the transmission shaft 3 and the driving shaft 17 through the cooperation of the multiple groups of flat keys 1702 and the key grooves 302, and then locked by screws, and a set of power source can be used to drive the transmission shaft 3 and the driving shaft 17 at the same time, which takes up little space and has low cost;

[0034] In order to adapt to different working conditions, the upper wall of the oil pump housing 1 and the position near the front wall are sequentially provided with a first oil inlet 7 and a second oil inlet 8 in a left-right distribution, and the left and right side walls of the oil pump housing 1 are respectively provided with a group of oil pump oil outlets 5, and the two groups of oil pump oil outlets 5 are connected with the inside of the oil pump housing 1. The upper wall of the return oil pump housing 2 and the position near the rear wall are sequentially provided with a third oil inlet 9 and a fourth oil inlet 10 in a left-right distribution, and the right wall of the return oil pump housing 2 is sequentially provided with a fifth oil inlet 11 and a sixth oil inlet 12 in a front-back distribution, and the left wall of the return oil pump housing 2 is The oil return pump outlet 6, the seventh oil inlet 13 and the eighth oil inlet 14 are sequentially arranged in the front and rear distribution. In actual work, the inside of the oil delivery pump housing 1 always pumps oil normally; the eight oil inlets face all empty suction or normal oil suction conditions, any seven oil inlet empty suction conditions, any six oil inlet empty suction conditions, any five oil inlet empty suction conditions, any four oil inlet empty suction conditions, any three oil inlet empty suction conditions, any two oil inlet empty suction conditions and any one oil inlet empty suction condition, and can adapt to the conditions of oil gas content of 0%-50% during oil return;

[0035] In order to ensure that multiple chambers do not interfere with each other, the inner wall of the return oil pump housing 2 is fixedly connected to a fixed partition 24, and the inner wall of the return oil pump housing 2 is slidably connected to a first sliding partition 23 and a second sliding partition 25 located on the front and rear sides of the fixed partition 24, respectively. The return oil pump housing 2 is divided into a first oil return chamber 26, a second oil return chamber 27, a third oil return chamber 28 and a fourth oil return chamber 29 distributed from back to front by the first sliding partition 23, the fixed partition 24 and the second sliding partition 25, and the first oil return chamber 26, the second oil return chamber 27, the third oil return chamber 28 and the fourth oil return chamber 29 are respectively provided with a first oil pumping structure, a second oil pumping structure , a third oil pumping structure and a fourth oil pumping structure, the third oil inlet 9 and the fourth oil inlet 10 are both connected to the interior of the first oil return chamber 26, the sixth oil inlet 12 and the eighth oil inlet 14 are both connected to the interior of the second oil return chamber 27, the fifth oil inlet 11 and the seventh oil inlet 13 are both connected to the interior of the third oil return chamber 28, the oil return pump oil outlet 6, the first oil inlet 7, and the second oil inlet 8 are all connected to the interior of the fourth oil return chamber 29, and a group of fixed partitions 24 and two groups of sliding partitions are used in the oil return pump housing 2 to divide the interior of the oil return pump housing 2 into four oil return chambers, which not only avoids the problem of oil leakage of the multi-pump, but also compresses the volume of the pump, and the multiple chambers do not interfere with each other;

[0036] In order to ensure the normal oil return, a first oil hole 2301 is provided on the inner wall of the first sliding partition 23 and located in the middle position in the left-right direction, a first inlet 2302 which is connected to the first oil hole 2301 is provided on the rear wall of the first sliding partition 23 and close to the lower wall, a first outlet 2303 which is connected to the first oil hole 2301 is provided on the front wall of the first sliding partition 23 and close to the upper wall, a second oil hole 2401 is provided on the inner wall of the fixed partition 24 and located in the middle position in the left-right direction, a second inlet 2402 which is connected to the second oil hole 2401 is provided on the rear wall of the fixed partition 24 and close to the lower wall, and a first outlet 2303 which is connected to the first oil hole 2301 is provided on the front wall of the fixed partition 24 and close to the upper wall. A second outlet 2403 communicating with the interior of the second oil hole 2401 is arranged on the inner wall and near the upper wall, a third oil hole 2501 is arranged on the inner wall of the second sliding partition 25 and located in the middle of the left and right directions, a third inlet 2502 communicating with the interior of the third oil hole 2501 is arranged on the rear wall of the second sliding partition 25 and near the lower wall, and a third outlet 2503 communicating with the interior of the third oil hole 2501 is arranged on the front wall of the second sliding partition 25 and near the upper wall. By setting three groups of oil holes, the return oil of the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 can be sent to the fourth oil return chamber 29;

[0037] In order to realize the oil return action, the first oil pumping structure includes two groups of first gears 19, and the two groups of first gears 19 are respectively fixedly connected to the outer wall of the driving shaft 17 and the outer wall of the driven shaft 18. The two groups of first gears 19 are located inside the first oil return chamber 26 and the circumferential outer walls are meshed with each other. The upper part of the meshing part of the two groups of first gears 19 is the first oil suction area, and the lower part of the meshing part of the two groups of first gears 19 is the first compression area. The first inlet 2302 is connected with the first compression area. The second oil pumping structure includes two groups of second gears 2 0, two sets of second gears 20 are respectively fixedly connected to the outer wall of the driving shaft 17 and the outer wall of the driven shaft 18, the two sets of second gears 20 are both located inside the second oil return chamber 27 and the circumferential outer walls are meshed with each other, the upper part of the meshing part of the two sets of second gears 20 is the second oil suction area, the lower part of the meshing part of the two sets of second gears 20 is the second compression area, the second inlet 2402 is connected to the second compression area, the third pump oil structure includes two sets of third gears 21, the two sets of third gears 21 are respectively fixedly connected to the outer wall of the driving shaft 17 The third oil return chamber 28 is provided with a plurality of third gears 22, each of which is provided with a plurality of third gears 21. The third oil return chamber 28 is provided with a plurality of third gears 22, each of which is provided with a plurality of third gears 22. The third oil return chamber 28 is provided with a plurality of third gears 22, each of which is provided with a plurality of third gears 22. The third oil return chamber 28 is provided with a plurality of third gears 22, each of which is provided with a plurality of third gears 22. The third oil return chamber 28 is provided with a plurality of third gears 22, each of which is provided with a plurality of third gears 22, each of which is provided with a plurality of fourth gears 22. The inner and circumferential outer walls of the oil chamber 29 mesh with each other, the upper part where the two sets of fourth gears 22 mesh with each other is the fourth oil suction area, the lower part where the two sets of fourth gears 22 mesh with each other is the fourth compression area, the first outlet 2303, the second outlet 2403 and the third outlet 2503 are all connected with the fourth oil suction area through pipelines, and the inner part of the oil return pump housing 2 forms four sets of external gear pumps through four sets of oil pumping structures, and cooperates with eight oil inlets and one oil return pump outlet 6 to realize the oil return function of different oil circuits of the engine lubrication system;

[0038] In order to eliminate the foam generated in the engine oil during the oil return process, a defoaming structure is arranged inside the first oil hole 2301, the second oil hole 2401 and the third oil hole 2501. The defoaming structure includes three groups of defoaming nets 30. The three groups of defoaming nets 30 are respectively detachably connected to the first oil hole 2301, the second oil hole 2401 and the third oil hole 2501. The three groups of defoaming nets 30 can be used to defoam the engine oil when returning oil from the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 to the fourth oil return chamber 29, thereby improving the lubrication effect of the engine oil.

[0039] Working principle: the inner rotor 15, the outer rotor 16, the transmission shaft 3 and the oil pump housing 1 form a cycloid rotor pump, which is used to actively pump oil for the engine lubrication system. The transmission shaft 3 and the driving shaft 17 are matched through multiple sets of flat keys 1702 and keyways 302 to transmit torque, and then locked by screws. One set of power source can drive the transmission shaft 3 and the driving shaft 17 at the same time, which takes up little space and has low cost. The inside of the return oil pump housing 2 forms four sets of external meshing gear pumps through four sets of oil pumping structures, which cooperate with eight oil inlets and one return oil pump outlet 6 to realize the oil return function of different oil circuits of the engine lubrication system.

[0040] In actual work, the inside of the oil pump housing 1 always pumps oil normally; the eight oil inlets face all empty suction or normal oil suction conditions, any seven oil inlets empty suction conditions, any six oil inlets empty suction conditions, any five oil inlets empty suction conditions, any four oil inlets empty suction conditions, any three oil inlets empty suction conditions, any two oil inlets empty suction conditions and any one oil inlet empty suction condition. When returning oil, it can adapt to the condition of oil gas content of 0%-50%. A set of fixed baffles 24 and two sets of sliding baffles are used in the oil return pump housing 2. The interior of the oil return pump housing 2 is divided into four oil return chambers, which not only avoids the problem of oil leakage in the multi-pump, but also compresses the volume of the pump. The multiple chambers do not interfere with each other. By setting three groups of oil holes, the return oil of the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 can be sent to the fourth oil return chamber 29. Through the three groups of defoaming nets 30, the oil can be defoamed when returning oil from the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 to the fourth oil return chamber 29, thereby improving the oil lubrication effect.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multiple lubricating oil pump, characterized in that: The invention comprises an oil pump housing (1), a pressure limiting valve (4), an oil return pump housing (2) and a transmission shaft (3); the oil pump housing (1) is fixedly connected to the front wall of the oil return pump housing (2); the oil pump housing (1) and the oil return pump housing (2) are fixed by bolts; the pressure limiting valve (4) is arranged on the front wall of the oil pump housing (1); the transmission shaft (3) is rotatably connected to the inside of the oil pump housing (1); the front end of the transmission shaft (3) passes through the front wall of the oil pump housing (1) and The transmission shaft (3) extends to the front side of the oil delivery pump housing (1), the rear end of the transmission shaft (3) sequentially penetrates the rear wall of the oil delivery pump housing (1) and the front wall of the oil return pump housing (2) and extends into the interior of the oil return pump housing (2), the outer wall of the transmission shaft (3) is fixedly connected to an inner rotor (15) located inside the oil delivery pump housing (1), the outer wall of the inner rotor (15) is sleeved with an outer rotor (16), and one end of the transmission shaft (3) extending into the interior of the oil return pump housing (2) is fixedly connected to a driving shaft (17) The rear end of the driving shaft (17) is rotatably connected to the inner rear wall of the oil return pump housing (2); a driven shaft (18) is rotatably connected to the inside of the oil return pump housing (2) and located on the left side of the driving shaft (17); a first oil inlet (7) and a second oil inlet (8) are sequentially arranged on the upper wall of the oil delivery pump housing (1) and near the front wall, and a group of oil delivery pump oil outlets (5) are respectively arranged on the left and right side walls of the oil delivery pump housing (1); the two groups of oil delivery pump oil outlets (5) are arranged on the left and right side walls of the oil delivery pump housing (1). ) are connected to the inside of the oil delivery pump housing (1); the upper wall of the oil return pump housing (2) and near the rear wall are provided with a third oil inlet (9) and a fourth oil inlet (10) in a left-right distribution in sequence; the right wall of the oil return pump housing (2) is provided with a fifth oil inlet (11) and a sixth oil inlet (12) in a front-to-back distribution; the left wall of the oil return pump housing (2) is provided with an oil return pump oil outlet (6), a seventh oil inlet (13) and an eighth oil inlet (14) in a front-to-back distribution.

2. The multiple lubricating oil pump according to claim 1, characterized in that: The inner wall of the oil return pump housing (2) is fixedly connected to a fixed partition (24); the inner wall of the oil return pump housing (2) is slidably connected to a first sliding partition (23) and a second sliding partition (25) located at the front and rear sides of the fixed partition (24); the oil return pump housing (2) is divided into a first oil return chamber (26), a second oil return chamber (27), a third oil return chamber (28) and a fourth oil return chamber (29) which are distributed from back to front in sequence by the first sliding partition (23), the fixed partition (24) and the second sliding partition (25); the first oil return chamber (26), the second oil return chamber (27), the third oil return chamber (28) and the fourth oil return chamber (29) are respectively provided with a first oil pumping structure, a second oil pumping structure, a third oil pumping structure and a fourth oil pumping structure.

3. The multiple lubricating oil pump according to claim 2, characterized in that: The third oil inlet (9) and the fourth oil inlet (10) are both connected to the interior of the first oil return chamber (26); the sixth oil inlet (12) and the eighth oil inlet (14) are both connected to the interior of the second oil return chamber (27); the fifth oil inlet (11) and the seventh oil inlet (13) are both connected to the interior of the third oil return chamber (28); and the oil return pump outlet (6), the first oil inlet (7) and the second oil inlet (8) are all connected to the interior of the fourth oil return chamber (29).

4. The multiple lubricating oil pump according to claim 3, characterized in that: A first oil hole (2301) is provided on the inner wall of the first sliding baffle (23) and is located in the middle of the left and right directions; a first inlet (2302) communicating with the interior of the first oil hole (2301) is provided on the rear wall of the first sliding baffle (23) and is close to the lower wall; a first outlet (2303) communicating with the interior of the first oil hole (2301) is provided on the front wall of the first sliding baffle (23) and is close to the upper wall; a second oil hole (2401) is provided on the inner wall of the fixed baffle (24) and is located in the middle of the left and right directions; a second inlet (2402) communicating with the interior of the second oil hole (2401) is provided on the rear wall of the fixed baffle (24) and is close to the lower wall; (24) A second outlet (2403) communicating with the interior of the second oil hole (2401) is provided on the front wall and near the upper wall; a third oil hole (2501) is provided on the inner wall of the second sliding baffle (25) and located in the center in the left-right direction; a third inlet (2502) communicating with the interior of the third oil hole (2501) is provided on the rear wall of the second sliding baffle (25) and near the lower wall; a third outlet (2503) communicating with the interior of the third oil hole (2501) is provided on the front wall of the second sliding baffle (25) and near the upper wall; and defoaming structures are provided inside the first oil hole (2301), the second oil hole (2401) and the third oil hole (2501).

5. The multiple lubricating oil pump according to claim 4, characterized in that: The first oil pump structure comprises two groups of first gears (19), the two groups of first gears (19) are respectively fixedly connected to the outer wall of the driving shaft (17) and the outer wall of the driven shaft (18), the two groups of first gears (19) are both located inside the first oil return chamber (26) and the circumferential outer walls are meshed with each other, the upper part of the meshing part of the two groups of first gears (19) is the first oil suction area, the lower part of the meshing part of the two groups of first gears (19) is the first compression area, and the first inlet (2302) is connected to the first compression area.

6. The multiple lubricating oil pump according to claim 5, characterized in that: The second oil pump structure comprises two groups of second gears (20), the two groups of second gears (20) are respectively fixedly connected to the outer wall of the driving shaft (17) and the outer wall of the driven shaft (18), the two groups of second gears (20) are both located inside the second oil return chamber (27) and the circumferential outer walls are meshed with each other, the upper part of the meshing part of the two groups of second gears (20) is the second oil suction area, the lower part of the meshing part of the two groups of second gears (20) is the second compression area, and the second inlet (2402) is connected with the second compression area.

7. The multiple lubricating oil pump according to claim 6, characterized in that: The third oil pump structure comprises two groups of third gears (21), the two groups of third gears (21) are respectively fixedly connected to the outer wall of the driving shaft (17) and the outer wall of the driven shaft (18), the two groups of third gears (21) are both located inside the third oil return chamber (28) and the circumferential outer walls are meshed with each other, the third oil suction area is located above the meshing point of the two groups of third gears (21), the third compression area is located below the meshing point of the two groups of third gears (21), and the third inlet (2502) is connected to the third compression area.

8. The multiple lubricating oil pump according to claim 7, characterized in that: The fourth oil pump structure comprises two groups of fourth gears (22), the two groups of fourth gears (22) are respectively fixedly connected to the outer wall of the driving shaft (17) and the outer wall of the driven shaft (18), the two groups of fourth gears (22) are both located inside the fourth oil return chamber (29) and the circumferential outer walls are meshed with each other, the upper part of the meshing part of the two groups of fourth gears (22) is the fourth oil suction area, the lower part of the meshing part of the two groups of fourth gears (22) is the fourth compression area, and the first outlet (2301), the second outlet (2401) and the third outlet (2503) are all connected to the fourth oil suction area through pipelines.

9. The multiple lubricating oil pump according to claim 8, characterized in that: The defoaming structure comprises three groups of defoaming nets (30), and the three groups of defoaming nets (30) are respectively detachably connected to the inside of the first oil passage hole (2301), the second oil passage hole (2401) and the third oil passage hole (2501).

10. The multiple lubricating oil pump according to claim 9, characterized in that: The rear end of the transmission shaft (3) is provided with a connection hole (301), the front end of the driving shaft (17) is provided with a connection head (1701), the outer wall of the connection head (1701) is matched with the inner wall of the connection hole (301) in size, the inner wall of the connection hole (301) is provided with a plurality of groups of key grooves (302) equally distributed in a circle, and the outer wall of the circle of the connection head (1701) is provided with a plurality of groups of flat keys (1702) matched with the key grooves (302).

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