Multiple connected lubricating oil pump

Abstract

The application provides a multi-connected lubricating oil pump and relates to the technical field of oil pumps. The multi-connected lubricating oil pump comprises an oil conveying pump shell, a pressure limiting valve, an oil return pump shell and a transmission shaft. The oil return pump shell and the oil conveying pump shell are connected together, so that the oil return pump shell and the oil conveying pump shell have the oil pumping function and the oil return function at the same time. One group of power inputs can drive the four groups of oil pumping structures in the inner rotor, the outer rotor and the oil return pump shell. The structure is compact, the space occupation is small, the cost is low, the reliability is high, the multiple oil return chambers in the oil return pump shell do not interfere with each other, multiple inlets and one outlet are arranged on the oil return pump, the working condition requirements of different oil return channels with different gas contents are met, one group of fixed partitions and two groups of sliding partitions are arranged in the oil return pump shell, and the oil return pump shell is divided into four oil return chambers. The oil leakage problem of the multi-connected pump is avoided, and the volume of the pump is compressed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil pumps, in particular to a multi-connected lubricating oil pump. BACKGROUND

[0002] The function of an oil pump is to pressurize oil and force it to the moving surfaces of the engine. The oil pump is the power source of the oil circulation in the engine lubrication system. The oil pump is installed at the lower part of the engine cylinder block and pressurizes the oil in the oil pan and sends it to the lubricating oil circuit when rotating. It is widely used in the fields of automobiles and aviation.

[0003] Dry sump technology originated from racing, which can improve the lubrication capacity and handling performance of the engine and improve 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 prior art, the oil pump has certain drawbacks. On the one hand, due to the increasingly complex structure of the automobile engine, the lubricating oil circuit is complex, and the traditional engine lubrication system adopts multiple single oil pumps distributed and working at the same time to meet the needs of engine operation. On the other hand, sports cars often use dry sump technology, and the engine structure is more compact, the oil pump arrangement space is more cramped, and the lubricating oil circuit is more complex.

[0005] In summary, the existing traditional oil pump cannot meet the oil circulation requirements of the dry sump small space and large displacement, and the traditional multiple single oil pump combination scheme is high in cost and not suitable. It is necessary to develop a multi-connected lubricating oil pump to solve the above problems. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a multi-connected lubricating oil pump, which solves the problem that the existing traditional oil pump cannot meet the oil circulation requirements of the dry sump small space and large displacement.

[0007] In order to achieve the above object, the present application is realized by the following technical scheme: A multi-connected lubricating oil pump, comprising an oil pump shell, a pressure limiting valve, an oil return pump shell and a transmission shaft, the oil pump shell is fixedly connected to the front wall of the oil return pump shell, the oil pump shell and the oil return pump shell are fixed by bolts, the pressure limiting valve is arranged on the front wall of the oil pump shell, the transmission shaft is rotatably connected inside the oil pump shell, the front end of the transmission shaft penetrates through the front wall of the oil pump shell and extends to the front side of the oil pump shell, the rear end of the transmission shaft penetrates through the rear wall of the oil pump shell, the front wall of the oil return pump shell and extends into the inside of the oil return pump shell, the inner rotor is fixedly connected to the outer wall of the transmission shaft inside the oil pump shell, the outer rotor is sleeved on the outer wall of the inner rotor, the driving shaft is fixedly connected to the end of the transmission shaft extending into the inside of the oil return pump shell, the rear end of the driving shaft is rotatably connected to the inner rear wall of the oil return pump shell, the driven shaft is rotatably connected to the left side of the driving shaft inside the oil return pump shell, the first oil inlet and the second oil inlet are arranged on the upper wall of the oil pump shell near the front wall in turn and are distributed on the left and right sides, a group of oil pump oil outlets are arranged on the left and right side walls of the oil pump shell respectively, the two groups of oil pump oil outlets are all through the inside of the oil pump shell, the third oil inlet and the fourth oil inlet are arranged on the upper wall of the oil return pump shell near the rear wall in turn and are distributed on the left and right sides, the fifth oil inlet and the sixth oil inlet are arranged on the right wall of the oil return pump shell in turn and are distributed on the front and back sides, the oil return pump oil outlet, the seventh oil inlet and the eighth oil inlet are arranged on the left wall of the oil return pump shell in turn and are distributed on the front and back sides.

[0008] Preferably, the fixed partition plate is fixedly connected to the inner side wall of the oil return pump shell, the first sliding partition plate and the second sliding partition plate are slidably connected to the inner side wall of the oil return pump shell on the front and back sides of the fixed partition plate respectively, the oil return pump shell is divided into the first oil return chamber, the second oil return chamber, the third oil return chamber and the fourth oil return chamber distributed from back to front by the first sliding partition plate, the fixed partition plate and the second sliding partition plate, and the first pump oil structure, the second pump oil structure, the third pump oil structure and the fourth pump oil structure are arranged in the first oil return chamber, the second oil return chamber, the third oil return chamber and the fourth oil return chamber respectively.

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

[0010] Preferably, the first sliding partition inner wall and the left-right direction central position are provided with a first oil passing hole, the first sliding partition rear wall and the lower wall are provided with a first inlet penetrating the first oil passing hole, the first sliding partition front wall and the upper wall position are provided with a first outlet penetrating the first oil passing hole, the fixed partition inner wall and the left-right direction central position are provided with a second oil passing hole, the fixed partition rear wall and the lower wall are provided with a second inlet penetrating the second oil passing hole, the fixed partition front wall and the upper wall position are provided with a second outlet penetrating the second oil passing hole, the second sliding partition inner wall and the left-right direction central position are provided with a third oil passing hole, the second sliding partition rear wall and the lower wall are provided with a third inlet penetrating the third oil passing hole, the second sliding partition front wall and the upper wall position are provided with a third outlet penetrating the third oil passing hole, and the first oil passing hole, the second oil passing hole and the third oil passing hole are provided with a defoaming structure.

[0011] Preferably, the first pump oil 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 in the first oil return chamber and the circumferential outer walls are engaged with each other, the upper part of the mutual engagement part of the two groups of first gears is a first oil suction area, and the lower part of the mutual engagement part of the two groups of first gears is a first compression area, and the first inlet penetrates the first compression area.

[0012] Preferably, the second pump oil structure includes two groups of second gears, and the two groups of second 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 second gears are located in the second oil return chamber and the circumferential outer walls are engaged with each other, the upper part of the mutual engagement part of the two groups of second gears is a second oil suction area, and the lower part of the mutual engagement part of the two groups of second gears is a second compression area, and the second inlet penetrates the second compression area.

[0013] Preferably, the third pump oil structure includes two groups of third gears, and the two groups of third 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 third gears are located in the third oil return chamber and the circumferential outer walls are engaged with each other, the upper part of the mutual engagement part of the two groups of third gears is a third oil suction area, and the lower part of the mutual engagement part of the two groups of third gears is a third compression area, and the third inlet penetrates the third compression area.

[0014] Preferably, the fourth pumping structure comprises two groups of fourth gears fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, respectively, and both of which are located inside the fourth oil return chamber and have circumferential outer walls engaged with each other, and the fourth pumping structure further comprises a fourth oil suction area above the engagement between the two groups of fourth gears, and a fourth compression area below the engagement between 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 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, the rear end of the transmission shaft is provided with a connecting hole, the front end of the driving shaft is provided with a connecting head, the outer wall of the connecting head is matched in size with the inner side wall of the connecting hole, the inner side wall of the connecting hole is provided with a plurality of circumferentially equidistributed key grooves, and the circumferential outer wall of the connecting head is provided with a plurality of flat keys matched with the key grooves.

[0017] The present application provides a multi-connected lubricating oil pump, which has the following advantages:

[0018] 1. Compared with the prior art, the multi-connected lubricating oil pump connects the oil return pump shell and the oil delivery pump shell together, so that it has both pumping function and oil return function, and through one group of power input, the four groups of pumping structures in the inner rotor, the outer rotor and the oil return pump shell can be driven, so that the structure is compact, the space occupation is small, the cost is low, and the reliability is high.

[0019] 2. Compared with the prior art, the multi-connected lubricating oil pump, the plurality of oil return chambers in the oil return pump shell do not interfere with each other, the oil return pump has a plurality of inlets and one outlet, which meets the working condition requirement that the gas content in different oil return channels is inconsistent, and the oil return pump shell is divided into four oil return chambers by using one fixed partition plate and two sliding partition plates, which not only avoids the problem of oil leakage of the multi-connected pump, but also compresses the volume of the pump. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front left view of the overall structure of the present application.

[0021] Figure 2 It is a front right view of the overall structure of the present application.

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

[0023] Figure 4 It is a partial cross-sectional view of the oil delivery pump shell, the oil return pump shell, the transmission shaft and the connecting structure of the present application.

[0024] Figure 5 Figure 3 is a bottom view of a partial structure of the transmission shaft of the application;

[0025] Figure 6 Figure 4 is a bottom view of a partial structure of the driving shaft of the application;

[0026] Figure 7 Figure 5 is a side view of the first sliding partition plate of the application;

[0027] Figure 8 Figure 6 is a side view of the fixed partition plate of the application;

[0028] Figure 9 Figure 7 is a side view of the second sliding partition plate of the application.

[0029] In the figure, 1 is an oil delivery pump housing, 2 is an oil return pump housing, 3 is a transmission shaft, 301 is a connecting hole, 302 is a key groove, 4 is a pressure limiting valve, 5 is an oil delivery pump oil outlet, 6 is an oil return pump oil outlet, 7 is a first oil inlet, 8 is a second oil inlet, 9 is a third oil inlet, 10 is a fourth oil inlet, 11 is a fifth oil inlet, 12 is a sixth oil inlet, 13 is a seventh oil inlet, 14 is an eighth oil inlet, 15 is an inner rotor, 16 is an outer rotor, 17 is a driving shaft, 1701 is a connecting head, 1702 is a flat key, 18 is a driven shaft, 19 is a first gear, 20 is a second gear, 21 is a third gear, 22 is a fourth gear, 23 is a first sliding partition plate, 2301 is a first oil passing hole, 2302 is a first inlet, 2303 is a first outlet, 24 is a fixed partition plate, 2401 is a second oil passing hole, 2402 is a second inlet, 2403 is a second outlet, 25 is a second sliding partition plate, 2501 is a third oil passing hole, 2502 is a third inlet, 2503 is a third outlet, 26 is a first oil return chamber, 27 is a second oil return chamber, 28 is a third oil return chamber, 29 is a fourth oil return chamber, and 30 is an anti-foaming net. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be clearly and completely described in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0031] Embodiment:

[0032] As Figures 1 to 9As shown, the embodiment of the present application provides a multi-connected lubricating oil pump, which comprises an oil delivery pump shell 1, a pressure limiting valve 4, an oil return pump shell 2 and a transmission shaft 3, the oil delivery pump shell 1 is fixedly connected to the front wall of the oil return pump shell 2, the oil delivery pump shell 1 and the oil return pump shell 2 are fixed by bolts, the pressure limiting valve 4 is arranged on the front wall of the oil delivery pump shell 1, the transmission shaft 3 is rotatably connected to the inside of the oil delivery pump shell 1, the front end of the transmission shaft 3 penetrates through the front wall of the oil delivery pump shell 1 and extends to the front side of the oil delivery pump shell 1, the rear end of the transmission shaft 3 penetrates through the rear wall of the oil delivery pump shell 1 and the front wall of the oil return pump shell 2 in sequence and extends into the inside of the oil return pump shell 2, the outer wall of the transmission shaft 3 and located in the inside of the oil delivery pump shell 1 is fixedly connected with an inner rotor 15, 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 delivery pump shell 1 form a cycloidal rotor pump, which is used for pumping oil for the engine lubrication system;

[0033] In order to realize the purpose of compact structure, one end of the transmission shaft 3 extending into the inside of the oil return pump shell 2 is fixedly connected with a driving shaft 17, the rear end of the driving shaft 17 is rotatably connected with the inside rear wall of the oil return pump shell 2, a driven shaft 18 is rotatably connected to the left side of the driving shaft 17 in the inside of the oil return pump shell 2, the rear end of the transmission shaft 3 is provided with a connecting hole 301, the front end of the driving shaft 17 is provided with a connecting head 1701, the outer wall of the connecting head 1701 is matched with the inner side wall of the connecting hole 301 in size, a plurality of circumferentially distributed key grooves 302 are arranged on the inner side wall of the connecting hole 301, a plurality of circumferential outer walls of the connecting head 1701 are provided with a plurality of flat keys 1702 matched with the key grooves 302, the transmission shaft 3 and the driving shaft 17 are connected through a plurality of flat keys 1702 and key grooves 302 to transmit torque, and then locked by screws, so that one power source can drive the transmission shaft 3 and the driving shaft 17 at the same time, the space occupation is small, and the cost is low;

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

[0035] In order to meet the multiple chambers do not interfere with each other, the fixed partition 24 is fixedly connected to the inner side wall of the oil return pump shell 2, the first sliding partition 23 and the second sliding partition 25 are slidingly connected to the inner side wall of the oil return pump shell 2 and located on the front and rear sides of the fixed partition 24 respectively, the oil return pump shell 2 is divided into 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 which are distributed in order from back to front by the first sliding partition 23, the fixed partition 24 and the second sliding partition 25, the first pump oil structure, the second pump oil structure, the third pump oil structure and the fourth pump oil structure are respectively arranged in 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, the third oil inlet 9 and the fourth oil inlet 10 are penetrated through the inside of the first oil return chamber 26, the sixth oil inlet 12 and the eighth oil inlet 14 are penetrated through the inside of the second oil return chamber 27, the fifth oil inlet 11 and the seventh oil inlet 13 are penetrated through the inside 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 penetrated through the inside of the fourth oil return chamber 29, a group of fixed partitions 24 and two groups of sliding partitions are used in the oil return pump shell 2 to divide the inside of the oil return pump shell 2 into four oil return chambers, which not only avoids the problem of oil leakage of the multiple pump, but also compresses the volume of the pump, and the multiple chambers do not interfere with each other;

[0036] In order to carry out normal oil return, the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 can send oil to the fourth oil return chamber 29 by arranging three groups of oil passing holes, the first oil return chamber 26, the second oil return chamber 27 and the third oil return chamber 28 can send oil to the fourth oil return chamber 29 by arranging three groups of oil passing holes;

[0037] In order to realize the oil return action, the first pumping structure includes two groups of first gears 19, which are fixedly connected to the outer walls of the driving shaft 17 and the driven shaft 18 respectively, and are located inside the first oil return chamber 26 and have circumferential outer walls that are engaged with each other. Above the engagement position of the two groups of first gears 19, there is a first oil suction area, and below the engagement position of the two groups of first gears 19, there is a first compression area. The first inlet 2302 is in communication with the first compression area. The second pumping structure includes two groups of second gears 20, which are fixedly connected to the outer walls of the driving shaft 17 and the driven shaft 18 respectively, and are located inside the second oil return chamber 27 and have circumferential outer walls that are engaged with each other. Above the engagement position of the two groups of second gears 20, there is a second oil suction area, and below the engagement position of the two groups of second gears 20, there is a second compression area. The second inlet 2402 is in communication with the second compression area. The third pumping structure includes two groups of third gears 21, which are fixedly connected to the outer walls of the driving shaft 17 and the driven shaft 18 respectively, and are located inside the third oil return chamber 28 and have circumferential outer walls that are engaged with each other. Above the engagement position of the two groups of third gears 21, there is a third oil suction area, and below the engagement position of the two groups of third gears 21, there is a third compression area. The third inlet 2502 is in communication with the third compression area. The fourth pumping structure includes two groups of fourth gears 22, which are fixedly connected to the outer walls of the driving shaft 17 and the driven shaft 18 respectively, and are located inside the fourth oil return chamber 29 and have circumferential outer walls that are engaged with each other. Above the engagement position of the two groups of fourth gears 22, there is a fourth oil suction area, and below the engagement position of the two groups of fourth gears 22, there is a fourth compression area. The first outlet 2303, the second outlet 2403, and the third outlet 2503 are all in communication with the fourth oil suction area through pipelines. The four groups of pumping structures inside the oil return pump housing 2 form four groups of externally meshing gear pumps, which cooperate with the eight oil inlets and the 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 oil during the oil return process, the first oil passage hole 2301, the second oil passage hole 2401, and the third oil passage hole 2501 are all provided with a defoaming structure. The defoaming structure includes three groups of defoaming nets 30, which are detachably connected inside the first oil passage hole 2301, the second oil passage hole 2401, and the third oil passage hole 2501. The three groups of defoaming nets 30 can perform defoaming treatment on the oil when the oil is returned 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 lubricating effect of the oil.

[0039] Working principle: the inner rotor 15, the outer rotor 16, the transmission shaft 3 and the oil pump shell 1 form a cycloidal rotor pump, which is used for pumping oil for the engine lubrication system, the transmission shaft 3 and the driving shaft 17 are connected through a plurality of flat keys 1702 and key grooves 302, and then the torque is transmitted through the screw locking, so that a group of power sources can drive the transmission shaft 3 and the driving shaft 17 at the same time, the space occupation is small, the cost is low, the oil return pump shell 2 is internally formed by four groups of oil pumping structures to form four groups of external gear pumps, which are matched with eight oil inlets and one oil return pump outlet 6, and the oil return function of different oil paths of the engine lubrication system is realized;

[0040] In actual work, the oil pump shell 1 is always normally pumped; the eight oil inlets face all suction or normal oil suction conditions, any seven oil inlets suction condition, any six oil inlets suction condition, any five oil inlets suction condition, any four oil inlets suction condition, any three oil inlets suction condition, any two oil inlets suction condition and any one oil inlet suction condition, and the oil return can adapt to the working condition of 0%-50% of oil gas content, a group of fixed partitions 24 and two groups of sliding partitions are used in the oil return pump shell 2 to divide the oil return pump shell 2 into four oil return chambers, which not only avoids the oil leakage problem of the multi-union pump, but also compresses the volume of the pump, the multiple chambers do not interfere with each other, by setting three groups of oil passing holes, the oil return 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, and the three groups of defoaming nets 30 can defoam the oil when returning 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 the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multiple connected lubricating oil pump characterized by: The utility model provides an oil pump, including oil delivery pump shell, pressure limiting valve, oil return pump shell and transmission shaft, the oil delivery pump shell fixed connection is established in the oil return pump shell front wall, the oil delivery pump shell with oil return pump shell between through bolt fixed, the pressure limiting valve sets up in the oil delivery pump shell front wall, transmission shaft rotatory connection is established in the oil delivery pump shell inside, transmission shaft front end penetrates the oil delivery pump shell front wall and stretches out to the oil delivery pump shell front side, transmission shaft rear end penetrates the oil return pump shell front wall in proper order and stretches into to the oil return pump shell inside, the fixed connection of transmission shaft outer wall and located oil delivery pump shell inside has the inner rotor, the outer rotor of inner rotor outer wall is set up, the fixed connection of transmission shaft stretches into to the oil return pump shell inside one end has the driving shaft, the driving shaft rear end with oil return pump shell inboard rear wall rotatory connection, the rotatory connection of oil return pump shell inside and located driving shaft left side has the driven shaft, the oil delivery pump shell upper wall and close front wall position left and right distribution in proper order is provided with first oil inlet and second oil inlet, the oil delivery pump shell left and right two side walls are provided with a group of oil delivery pump oil outlet respectively, two groups oil delivery pump oil outlet all with oil delivery pump shell inside through-penetration, the oil return pump shell upper wall and close rear wall position left and right distribution in proper order is provided with third oil inlet and fourth oil inlet, the oil return pump shell right wall is provided with fifth oil inlet and sixth oil inlet in proper order and is distributed in front and back, the oil return pump shell left wall is provided with oil return pump oil outlet, seventh oil inlet and eighth oil inlet in proper order and is distributed in front and back, The fixed connection of oil return pump shell inboard wall has fixed baffle, the first sliding baffle and the second sliding baffle of oil return pump shell inboard wall and located fixed baffle front and back two sides are slidably connected, the oil return pump shell is divided into first oil return chamber, second oil return chamber, third oil return chamber and fourth oil return chamber in proper order and is distributed from back to front through first sliding baffle, fixed baffle and second sliding baffle, the first oil return chamber, second oil return chamber, third oil return chamber and fourth oil return chamber are provided with first pump oil structure, second pump oil structure, third pump oil structure and fourth pump oil structure respectively in the inside portion, The third oil inlet and fourth oil inlet all with first oil return chamber inside through-penetration, the sixth oil inlet and eighth oil inlet all with second oil return chamber inside through-penetration, the fifth oil inlet and seventh oil inlet all with third oil return chamber inside through-penetration, the oil return pump oil outlet, first oil inlet, second oil inlet all with fourth oil return chamber inside through-penetration.

2. The multiple lubricating oil pump according to claim 1, characterized in that: The first sliding partition inner wall and the left-right direction central position are provided with a first oil passing hole, the first sliding partition rear wall and the lower wall are provided with a first inlet penetrating the first oil passing hole, the first sliding partition front wall and the upper wall position are provided with a first outlet penetrating the first oil passing hole, the fixed partition inner wall and the left-right direction central position are provided with a second oil passing hole, the fixed partition rear wall and the lower wall are provided with a second inlet penetrating the second oil passing hole, the fixed partition front wall and the upper wall position are provided with a second outlet penetrating the second oil passing hole, the second sliding partition inner wall and the left-right direction central position are provided with a third oil passing hole, the second sliding partition rear wall and the lower wall are provided with a third inlet penetrating the third oil passing hole, the second sliding partition front wall and the upper wall position are provided with a third outlet penetrating the third oil passing hole, and the first oil passing hole, the second oil passing hole and the third oil passing hole are provided with a defoaming structure.

3. The multiple lubricating oil pump according to claim 2, characterized in that: The first oil pumping structure includes two groups of first gears, two groups of the first gears are fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, two groups of the first gears are located in the first oil return chamber and the circumferential outer wall is engaged with each other, the upper of the mutual engagement of two groups of the first gears is a first oil suction area, the lower of the mutual engagement of two groups of the first gears is a first compression area, and the first inlet and the first compression area are penetrated.

4. The multiple lubricating oil pump according to claim 3, characterized in that: The second oil pumping structure includes two groups of second gears, two groups of the second gears are fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, two groups of the second gears are located in the second oil return chamber and the circumferential outer wall is engaged with each other, the upper of the mutual engagement of two groups of the second gears is a second oil suction area, the lower of the mutual engagement of two groups of the second gears is a second compression area, and the second inlet and the second compression area are penetrated.

5. The multiple lubricating oil pump according to claim 4, characterized in that: The third oil pumping structure includes two groups of third gears, two groups of the third gears are fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, two groups of the third gears are located in the third oil return chamber and the circumferential outer wall is engaged with each other, the upper of the mutual engagement of two groups of the third gears is a third oil suction area, the lower of the mutual engagement of two groups of the third gears is a third compression area, and the third inlet and the third compression area are penetrated.

6. The multiple lubricating oil pump according to claim 5, characterized in that: The fourth oil pumping structure includes two groups of fourth gears, two groups of the fourth gears are fixedly connected to the outer wall of the driving shaft and the outer wall of the driven shaft, two groups of the fourth gears are located in the fourth oil return chamber and the circumferential outer wall is engaged with each other, the upper of the mutual engagement of two groups of the fourth gears is a fourth oil suction area, the lower of the mutual engagement of two groups of the fourth gears is a fourth compression area, and the first outlet, the second outlet and the third outlet are penetrated by the pipeline and the fourth oil suction area.

7. The multiple lubricating oil pump according to claim 6, characterized in that: The defoaming structure includes three groups of defoaming nets, three groups of the defoaming nets are detachably connected in the first oil passing hole, the second oil passing hole and the third oil passing hole.

8. The multiple lubricating oil pump according to claim 7, characterized in that: The rear end of the transmission shaft is provided with a connecting hole, the front end of the driving shaft is provided with a connecting head, the outer wall of the connecting head is matched with the inner side wall of the connecting hole in size, the inner side wall of the connecting hole is provided with a plurality of groups of key grooves which are circumferentially equidistributed, and the circumferential outer wall of the connecting head is provided with a plurality of groups of flat keys which are matched with the key grooves.

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