Engine end cover integrated oil pump assembly

Abstract

An engine end cover integrated oil pump assembly comprises an engine end cover, an oil pump, a crankshaft driving gear and a crankshaft driving gear retaining structure. The oil pump comprises a pump body, an oil pump shaft and an oil pump driving gear, the pump body is integrated with the engine end cover, and the oil pump driving gear is connected with the oil pump shaft. The crankshaft driving gear is rotatably arranged on the engine end cover and externally engaged with the oil pump driving gear. The crankshaft driving gear has a shaft hole through which the engine crankshaft passes, the shaft hole is opposite to an end cover through hole of the engine end cover, and the crankshaft driving gear is provided with a shaft connecting structure for connecting the engine crankshaft; the crankshaft driving gear retaining structure is used for retaining the crankshaft driving gear on the engine end cover. The transmission ratio of the crankshaft driving gear and the driving oil pump gear is designed, the range of the adjusting variable is widened, the oil supply on demand is realized, the power consumption loss is reduced, and the problem of difficult tooth alignment of the driving gear and the oil pump driving gear during assembly is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the lubrication technology of vehicle engine, in particular to the oil pump technology. BACKGROUND

[0002] The traditional crankshaft direct drive type oil pump is bulky and heavy, and the pump body and the pump cover around the crankshaft cannot be locked by bolts. With the increase of oil temperature and oil pressure, the axial deformation of the pump body and the pump cover increases, the end face gap between the rotor or gear inside the pump and the pump body and the pump cover increases, which increases the internal and external leakage of the oil pump, increases the oil consumption of the oil pump, and reduces the working efficiency of the oil pump.

[0003] In addition, for the traditional crankshaft direct drive type oil pump, the transmission ratio of the engine crankshaft and the oil pump shaft is 1:1. Therefore, for the diesel engine with a speed range of 0-2200 rpm, the traditional crankshaft direct drive type oil pump cannot cover the entire optimal working condition of the oil pump, thereby affecting the working efficiency of the oil pump.

[0004] At present, some manufacturers have also proposed a design scheme of an engine end cover integrated oil pump assembly, which comprises an engine end cover and an oil pump. The oil pump comprises a pump body, an oil pump shaft and an oil pump driving gear, the pump body is integrated with the engine end cover, the oil pump driving gear is connected with the oil pump shaft and is engaged with the crankshaft driving gear installed on the engine crankshaft to receive the torque output by the engine crankshaft. The scheme adjusts the crankshaft direct drive type oil pump to a non-direct drive type oil pump through gear transmission, but the crankshaft driving gear is usually interference pressed on the engine crankshaft, which makes it difficult to align the oil pump driving gear of the oil pump with the crankshaft driving gear on the crankshaft during assembly, affecting the assembly efficiency. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an engine end cover integrated oil pump assembly, which solves the problem of difficult alignment of the crankshaft driving gear connected with the engine crankshaft and the oil pump driving gear of the oil pump during assembly, and is easy to assemble on the engine crankshaft, and has high oil pump working efficiency.

[0006] The engine end cover integrated oil pump assembly provided by the embodiment of the present application comprises an engine end cover and an oil pump, the oil pump comprises a pump body, an oil pump shaft and an oil pump driving gear, the pump body is integrated with the engine end cover, and the oil pump driving gear is connected with the oil pump shaft; the engine end cover is provided with an end cover through hole through which the engine crankshaft passes; the engine end cover integrated oil pump assembly comprises a crankshaft driving gear and a crankshaft driving gear retaining structure; the crankshaft driving gear is rotatably arranged on the engine end cover and externally meshed with the oil pump driving gear; the crankshaft driving gear is provided with a shaft hole through which the engine crankshaft passes, the shaft hole is opposite to the end cover through hole, and the crankshaft driving gear is provided with a shaft connecting structure for connecting the engine crankshaft so that the crankshaft driving gear can synchronously rotate with the engine crankshaft; the crankshaft driving gear retaining structure is used for retaining the crankshaft driving gear on the engine end cover to prevent the crankshaft driving gear from falling off from the engine end cover.

[0007] The engine end cover integrated oil pump assembly, wherein the transmission ratio of the crankshaft driving gear and the oil pump driving gear is such that when the rotating speed of the engine crankshaft is 900 rpm-1500 rpm, the rotating speed V of the oil pump satisfies 1000 rpm≤V≤4000 rpm.

[0008] The engine end cover integrated oil pump assembly, wherein the oil pump comprises a pump cover, the pump cover is close to the inner side of the engine end cover, and the pump cover is detachably connected with the pump body through a plurality of fasteners.

[0009] The engine end cover integrated oil pump assembly, wherein the oil pump is a variable displacement oil pump, the variable displacement oil pump comprises a proportional electromagnetic valve or a switching electromagnetic valve, the inlet of the proportional electromagnetic valve or the switching electromagnetic valve is communicated with the main oil passage of the engine lubricating system, and the outlet of the proportional electromagnetic valve or the switching electromagnetic valve is communicated with the feedback cavity of the variable displacement oil pump.

[0010] After the above technical solution is adopted, the present application has at least the following advantages and characteristics:

[0011] 1. The crankshaft driving gear connected with the engine crankshaft and the oil pump driving gear of the oil pump are both integrated on the engine end cover in the embodiment of the present application, and the two are in external meshing state, thereby solving the problem of difficult tooth matching of the separate assembly of the crankshaft driving gear and the oil pump driving gear, and meanwhile, the crankshaft driving gear can be quickly installed on the engine crankshaft through the shaft connecting structure, and the assembly is convenient;

[0012] 2. The crankshaft driving gear retaining structure is arranged in the embodiment, the crankshaft driving gear can be retained on the engine end cover, and the crankshaft driving gear is prevented from falling off due to vibration during transportation;

[0013] 3、The oil pump of the embodiment is integrated on the engine end cover, the volume of the oil pump is reduced, the pump cover and the oil pump can be firmly connected through fasteners, oil leakage is avoided, the power consumption of the oil pump is reduced, the working efficiency of the oil pump is improved, so that the thermal efficiency of the engine is improved, and the weight of the assembly is also reduced;

[0014] 4、By designing the transmission ratio of the crankshaft driving gear and the driving oil pump gear, the low rotation speed of the diesel engine crankshaft direct drive type oil pump, the narrow range of adjustable variable, and the problem that the variable oil cannot play a variable role can be solved, the range of adjustable variable is widened, on-demand oil supply is realized, power consumption loss is reduced, and the effect of oil saving and emission reduction is realized. For the large torque low speed engine with a rotation speed below 2200 rpm, the embodiment of the application increases the speed through gear transmission, so that when the rotation speed of the engine crankshaft is 900 rpm-1500 rpm, the rotation speed range of the oil pump is 1000 rpm-4000 rpm, the oil pump operates in the optimal working efficiency interval, and the oil pump plays the optimal working efficiency.

[0015] 5、The embodiment of the application controls the oil discharge capacity of the variable displacement oil pump through the proportional electromagnetic valve or the on-off electromagnetic valve, realizes on-demand oil supply, and saves energy and reduces consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A front view schematic diagram of an engine end cover integrated oil pump assembly according to an embodiment of the application is shown.

[0017] Figure 2 A rear view schematic diagram of an engine end cover integrated oil pump assembly according to an embodiment of the application is shown.

[0018] Figure 3 An exploded view schematic diagram of an engine end cover integrated oil pump assembly according to an embodiment of the application is shown.

[0019] Figure 4 A cross-sectional view schematic diagram of an engine end cover integrated oil pump assembly according to an embodiment of the application is shown.

[0020] Figure 5 An assembly schematic diagram of an engine end cover integrated oil pump assembly and an engine crankshaft according to an embodiment of the application is shown. DETAILED DESCRIPTION

[0021] The application will be described in detail below with reference to the drawings and specific embodiments.

[0022] Figures 1 to 4 Structure schematic diagrams of an engine end cover integrated oil pump assembly according to an embodiment of the application are shown respectively. Figure 5An assembly diagram of an engine end cover integrated oil pump assembly and an engine crankshaft according to an embodiment of the present application is shown. Please refer to Figures 1 to 5 An engine end cover integrated oil pump assembly according to an embodiment of the present application comprises an engine end cover 1, an oil pump 2, a crankshaft drive gear 3 and a crankshaft drive gear retaining structure.

[0023] The oil pump 2 comprises a pump body 21, a pump cover 22, an oil pump shaft 23 and an oil pump drive gear 24. The pump body 21 is integrated with the engine end cover 1. In this embodiment, the pump body 21 is integrally formed with the engine end cover 1, and a part of the engine end cover 1 is used as the pump body 21 of the oil pump, thereby reducing the overall weight of the product. The pump cover 22 is close to the inner side of the engine end cover 1, and the pump cover 22 is detachably connected with the pump body 21 by means of a plurality of fasteners (first bolts 81 in this embodiment). In this specification, the inner side of the engine end cover 1 refers to the side close to the inside of the engine, and the outer side of the engine end cover 1 refers to the side close to the outside of the engine. One end of the oil pump shaft 23 penetrates through the pump cover 22, and the oil pump drive gear 24 is installed on the one end of the oil pump shaft 23 to drive the oil pump shaft 23 to rotate synchronously.

[0024] The pump body 21 is provided with a mounting through hole 210 penetrating through the outer side surface of the engine end cover, and the other end of the oil pump shaft 23 is rotatably inserted into the mounting through hole 210. By means of the mounting through hole 210, axial support can be provided for the oil pump shaft 23 when the oil pump drive gear 24 is interference press fitted on the oil pump shaft 23, thereby realizing interference press fitting of the oil pump drive gear.

[0025] Further, the oil pump 2 comprises a mounting through hole sealing structure, which comprises a sealing cover 25, a sealing ring 26 and an annular sealing groove 27 formed on the outer side surface of the engine end cover. The annular sealing groove 27 surrounds the mounting through hole 210. The sealing cover 25 comprises a cover body 251, an annular flange 252 extending radially outward from the bottom edge of the side wall of the cover body 251, and an annular flange 253 bent from the outer edge of the annular flange 252 to the top. The top wall 2511 of the cover body 251 covers the mounting through hole 210, the side wall 2512 of the cover body 251 extends into the annular sealing groove 27, and the annular flange 253 is interference fitted with the outer side surface of the annular sealing groove 27, so that the side wall 2512 of the cover body presses the sealing ring 26 against the inner side surface of the annular sealing groove 27, thereby achieving the sealing effect. Optionally, the vertical cross section of the annular flange 252 is in a wave shape, and the wave shape structure can enhance the elasticity. In a specific embodiment, the material of the sealing cover 25 is stainless steel.

[0026] In this embodiment, the oil pump 1 is a vane pump, Figure 3The vane 281, the eccentric ring 282, and the like of the vane pump are shown in FIG. 1. In other embodiments, the oil pump 1 can also be a gerotor pump, a gear pump, a pendulum-type sliding vane pump, or a hinged vane pump (which is not a conventional vane pump), and the like.

[0027] The engine end cover 1 is provided with an end cover through hole 10 through which the engine crankshaft 9 passes. The crankshaft drive gear 3 is rotatably provided to the engine end cover 1 and externally engages with the oil pump drive gear 24. The crankshaft drive gear 3 has a shaft hole 30 through which the engine crankshaft 9 passes, the shaft hole 30 being opposite to the end cover through hole 10.

[0028] In the present embodiment, the crankshaft drive gear 3 includes a gear shaft 31 and a gear plate 32, one end of the gear shaft 31 being rotatably inserted into the end cover through hole 10, and the gear plate 32 being connected to the other end of the gear shaft 31 and externally engaging with the oil pump drive gear 24. The gear shaft 31 has a central through hole extending in the axial direction, which constitutes the above-mentioned shaft hole 30.

[0029] The crankshaft drive gear 3 is also provided with a shaft connecting structure for connecting the engine crankshaft 9 so that the crankshaft drive gear 3 can synchronously rotate with the engine crankshaft 9. In the present embodiment, the shaft connecting structure is a spline groove 301 provided on the inner wall of the shaft hole 30, and the crankshaft drive gear 3 and the engine crankshaft 9 are fitted by spline clearance, which is very convenient. In other embodiments, the shaft connecting structure can also be a key provided on the inner wall of the shaft hole 30, and the like.

[0030] The crankshaft drive gear retaining structure is used to retain the crankshaft drive gear 3 to the engine end cover 1 so as to prevent the crankshaft drive gear 3 from falling off the engine end cover 1 due to vibration and the like during transportation.

[0031] The crankshaft drive gear retaining structure includes a first axial limiting structure and a second axial limiting structure, the first axial limiting structure being provided between the crankshaft drive gear 3 and the engine end cover 1 to limit the axial movement of the crankshaft drive gear in the direction of moving close to the outside of the engine end cover, and the second axial limiting structure being provided between the crankshaft drive gear and the engine end cover to limit the axial movement of the crankshaft drive gear in the direction of moving close to the inside of the engine end cover.

[0032] Further, the first axial limiting structure comprises a first limiting portion arranged on the crankshaft driving gear 3 and a second limiting portion arranged on the engine end cover 1 and matched with the first limiting portion, and the second axial limiting structure comprises a third limiting portion arranged on the crankshaft driving gear 3 and a fourth limiting portion arranged on the engine end cover 1 and matched with the third limiting portion. The engine crankshaft 9 has a fifth limiting portion matched with the crankshaft driving gear 3 to prevent the crankshaft driving gear 3 from moving towards the inner side of the engine end cover. When the crankshaft driving gear 3 is assembled on the engine crankshaft 9, the fifth limiting portion is matched with the crankshaft driving gear 3 to make the third limiting portion and the fourth limiting portion always have a gap and not contact, so that the crankshaft driving gear retaining structure does not interfere with the rotation of the crankshaft driving gear.

[0033] In the embodiment, the first axial limiting structure comprises a first stepped surface 331 (i.e. the aforementioned first limiting portion) arranged on the crankshaft driving gear 3 and a stop surface 131 (i.e. the aforementioned second limiting portion) arranged on the engine end cover 1. The stop surface 131 abuts against the first stepped surface 331 to prevent the crankshaft driving gear 3 from moving axially towards the outer side of the engine end cover. The second axial limiting structure comprises a second stepped surface 332 (i.e. the aforementioned third limiting portion) arranged on the crankshaft driving gear and an elastic baffle 41 (i.e. the aforementioned fourth limiting portion) arranged on the engine end cover 1. One end of the elastic baffle 41 is fixed on the engine end cover 1 by a bolt, and the other end of the elastic baffle 41 is hook-shaped and faces the second stepped surface 332. The other end of the elastic baffle 41 and the second stepped surface 332 have a gap therebetween. The arrangement of the elastic baffle makes the assembly of the crankshaft driving gear more convenient, and the elastic baffle does not interfere with the normal operation of the engine.

[0034] In the embodiment, the fifth limiting portion is a shaft shoulder of the engine crankshaft 9. When the engine end cover integrated oil pump assembly is installed on the engine crankshaft 9, the shaft shoulder of the engine crankshaft 9 abuts against the end surface of the crankshaft driving gear 3 (i.e. the left end surface of the crankshaft driving gear 3), thereby limiting the axial movement of the crankshaft driving gear 3 towards the inner side of the engine end cover and making the other end of the elastic baffle 41 and the second stepped surface 332 always not contact, so that the crankshaft driving gear retaining structure does not interfere with the rotation of the crankshaft driving gear. Figure 5

[0035] In another embodiment, the second axial limiting structure can also adopt the following structure, i.e. the elastic baffle is fixed on the end surface of the crankshaft driving gear 32 by a bolt, and a stepped stop portion matched with the elastic baffle is arranged on the hole wall of the end cover through hole 10 of the engine end cover.

[0036] ​In another embodiment, the crankshaft drive gear retaining structure can also adopt a small step interference, the crankshaft drive gear is put into the end cover through hole 10 after being frozen, and an inverted buckle is formed after the temperature returns to normal temperature to prevent the crankshaft drive gear from being axially loose.

[0037] The crankshaft drive gear retaining structure of the embodiment of the present application can prevent the crankshaft drive gear from falling off from the engine end cover during the transportation of the oil pump assembly product and before it is assembled to the engine crankshaft, and it is not necessary to disassemble the crankshaft drive gear retaining structure after it is assembled to the engine crankshaft, and the crankshaft drive gear retaining structure does not interfere with the operation of the crankshaft drive gear.

[0038] In a specific embodiment, the transmission ratio of the crankshaft drive gear 3 and the oil pump drive gear 24 is such that when the rotation speed of the engine crankshaft 9 is 900 rpm-1500 rpm, the rotation speed V of the oil pump 1 satisfies: 1000 rpm≤V≤4000 rpm. The reason for this design is that the inventors have found in practice that the total efficiency of the oil pump is optimal at a rotation speed of 1000-4000 rpm. For a low-speed diesel engine, the rotation speed of the oil pump can be increased by gear transmission, so that when the rotation speed of the engine crankshaft is 900 rpm-1500 rpm, the rotation speed of the oil pump changes in the range of 1000 rpm-4000 rpm, so that the oil pump operates in the optimal working efficiency range, and the oil pump can work at the optimal working efficiency.

[0039] In a specific embodiment, the oil pump 1 is a variable displacement oil pump, which comprises a proportional electromagnetic valve 5, the inlet of the proportional electromagnetic valve 5 is connected to the main oil passage of the engine lubrication system, and the outlet of the proportional electromagnetic valve 5 is connected to the feedback chamber of the variable displacement oil pump. The oil displacement of the variable displacement oil pump can be controlled by the proportional electromagnetic valve, so that the oil is supplied on demand, and energy consumption is reduced. In other embodiments, a switch electromagnetic valve can be used instead of the proportional electromagnetic valve.

[0040] The oil pump assembly of the embodiment integrates the crankshaft drive gear, the oil pump and the engine end cover together, and the weight is reduced by about 10%-20% compared with the traditional crankshaft direct drive type oil pump assembly. Compared with the traditional crankshaft direct drive type oil pump assembly using involute circular arc gear pump or trochoidal rotor pump, the total efficiency of the oil pump can be increased by more than 40%, and compared with the traditional crankshaft direct drive type oil pump assembly using vane variable pump, the total efficiency of the oil pump can be increased by more than 10%, and more than 1g of fuel can be saved per 1kWh.

[0041] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An engine end cover integrated oil pump assembly, comprising an engine end cover and an oil pump; the oil pump comprises a pump body, an oil pump shaft, and an oil pump drive gear, the pump body and the engine end cover being integrated into one body, the oil pump drive gear being connected to the oil pump shaft; the engine end cover is provided with an end cover through-hole for the engine crankshaft to pass through; characterized in that: The engine end cover integrated oil pump assembly includes a crankshaft drive gear and a crankshaft drive gear retaining structure; The crankshaft drive gear is rotatably disposed on the engine end cover and is externally meshed with the oil pump drive gear; the crankshaft drive gear has an axial hole for the engine crankshaft to pass through, the axial hole being opposite to the end cover through-hole, and the crankshaft drive gear is provided with an axial connection structure for connecting to the engine crankshaft so that the crankshaft drive gear can rotate synchronously with the engine crankshaft; The crankshaft drive gear holding structure is used to hold the crankshaft drive gear on the engine end cover to prevent the crankshaft drive gear from falling off the engine end cover; the crankshaft drive gear holding structure includes a first axial limiting structure and a second axial limiting structure, the first axial limiting structure is arranged between the crankshaft drive gear and the engine end cover to limit the axial movement of the crankshaft drive gear toward the direction close to the outside of the engine end cover, and the second axial limiting structure is arranged between the crankshaft drive gear and the engine end cover to limit the axial movement of the crankshaft drive gear toward the direction close to the inside of the engine end cover; The first axial limiting structure includes a first step surface provided on the crankshaft drive gear and a stop surface provided on the engine end cover, wherein the stop surface abuts against the first step surface to prevent the crankshaft drive gear from axially moving toward the outer side of the engine end cover; The second axial limiting structure includes a second step surface arranged on the crankshaft drive gear and an elastic baffle arranged on the engine end cover, one end of the elastic baffle is connected to the engine end cover, and the other end of the elastic baffle is hook-shaped and faces the second step surface, and there is a gap between the other end of the elastic baffle and the second step surface.

2. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The crankshaft drive gear includes a gear shaft and a gear plate, one end of the gear shaft is rotatably inserted into the through hole of the end cover, and the gear plate is connected to the other end of the gear shaft and is externally meshed with the oil pump drive gear; The gear shaft has a central through hole extending in the axial direction, and the central through hole constitutes the shaft hole.

3. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The shaft connection structure is a keyway or a key arranged on the inner wall of the shaft hole.

4. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The transmission ratio of the crankshaft drive gear and the oil pump drive gear is such that when the rotation speed of the engine crankshaft is 900 rpm to 1500 rpm, the rotation speed V of the oil pump satisfies: 1000 rpm≤V≤4000 rpm.

5. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The oil pump includes a pump cover, the pump cover is close to the inner side of the engine end cover, and the pump cover is detachably connected to the pump body through a plurality of fasteners; One end of the oil pump shaft passes through the pump cover, and the oil pump driving gear is installed on one end of the oil pump shaft.

6. The engine end cover integrated oil pump assembly according to claim 5, characterized in that: The pump body is provided with a mounting through hole which passes through the outer side surface of the engine end cover, and the other end of the oil pump shaft is rotatably inserted into the mounting through hole; The oil pump includes a mounting through-hole sealing structure, which includes a sealing cover, a sealing ring, and an annular sealing groove formed on the outer side of the engine end cover; The annular sealing groove surrounds the mounting through hole; the sealing cover includes a cover body, an annular flange extending radially outward from the peripheral edge of the bottom end of the side wall of the cover body, and an annular flange bent toward the top from the outer peripheral edge of the annular flange; the top wall of the cover body covers the mounting through hole, the side wall of the cover body extends into the annular sealing groove, and the annular flange is interference fit with the outer side surface of the annular sealing groove so that the side wall of the cover body presses the sealing ring against the inner side surface of the annular sealing groove.

7. The engine end cover integrated oil pump assembly according to claim 6, characterized in that: The vertical cross section of the annular flange is wave-shaped.

8. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The oil pump is a variable displacement oil pump, which includes a proportional solenoid valve or a switching solenoid valve. The inlet of the proportional solenoid valve or the switching solenoid valve is connected to the main oil channel of the engine lubrication system, and the outlet of the proportional solenoid valve or the switching solenoid valve is connected to the feedback chamber of the variable displacement oil pump.

9. The engine end cover integrated oil pump assembly according to claim 1, characterized in that: The oil pump is a vane pump, a cycloid rotor pump, a gear pump, a pendulum vane pump or a hinged vane pump.

10. An engine end cover integrated oil pump assembly, comprising an engine end cover and an oil pump; the oil pump comprises a pump body, an oil pump shaft, and an oil pump drive gear, the pump body and the engine end cover being integrated into one body, the oil pump drive gear being connected to the oil pump shaft; the engine end cover is provided with an end cover through-hole for the engine crankshaft to pass through; characterized in that: The engine end cover integrated oil pump assembly includes a crankshaft drive gear and a crankshaft drive gear retaining structure; The crankshaft drive gear is rotatably disposed on the engine end cover and is externally meshed with the oil pump drive gear; the crankshaft drive gear has an axial hole for the engine crankshaft to pass through, the axial hole being opposite to the end cover through-hole, and the crankshaft drive gear is provided with an axial connection structure for connecting to the engine crankshaft so that the crankshaft drive gear can rotate synchronously with the engine crankshaft; The crankshaft drive gear holding structure is used to hold the crankshaft drive gear on the engine end cover to prevent the crankshaft drive gear from falling off the engine end cover; the crankshaft drive gear holding structure includes a first axial limiting structure and a second axial limiting structure, the first axial limiting structure is arranged between the crankshaft drive gear and the engine end cover to limit the axial movement of the crankshaft drive gear toward the direction close to the outside of the engine end cover, and the second axial limiting structure is arranged between the crankshaft drive gear and the engine end cover to limit the axial movement of the crankshaft drive gear toward the direction close to the inside of the engine end cover; The first axial limiting structure includes a first limiting portion provided on the crankshaft drive gear and a second limiting portion provided on the engine end cover and cooperating with the first limiting portion; the second axial limiting structure includes a third limiting portion provided on the crankshaft drive gear and a fourth limiting portion provided on the engine end cover and cooperating with the third limiting portion; the engine crankshaft has a fifth limiting portion cooperating with the crankshaft drive gear to prevent the crankshaft drive gear from moving toward the inner side of the engine end cover; When the crankshaft driving gear is assembled onto the engine crankshaft, the fifth limiting portion cooperates with the crankshaft driving gear so that there is always a gap between the third limiting portion and the fourth limiting portion.

11. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The crankshaft drive gear includes a gear shaft and a gear plate, one end of the gear shaft is rotatably inserted into the through hole of the end cover, and the gear plate is connected to the other end of the gear shaft and is externally meshed with the oil pump drive gear; The gear shaft has a central through hole extending in the axial direction, and the central through hole constitutes the shaft hole.

12. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The shaft connection structure is a keyway or a key arranged on the inner wall of the shaft hole.

13. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The transmission ratio of the crankshaft drive gear and the oil pump drive gear is such that when the rotation speed of the engine crankshaft is 900 rpm to 1500 rpm, the rotation speed V of the oil pump satisfies: 1000 rpm≤V≤4000 rpm.

14. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The oil pump includes a pump cover, the pump cover is close to the inner side of the engine end cover, and the pump cover is detachably connected to the pump body through a plurality of fasteners; One end of the oil pump shaft passes through the pump cover, and the oil pump driving gear is installed on one end of the oil pump shaft.

15. The engine end cover integrated oil pump assembly according to claim 14, characterized in that: The pump body is provided with a mounting through hole which passes through the outer side surface of the engine end cover, and the other end of the oil pump shaft is rotatably inserted into the mounting through hole; The oil pump includes a mounting through-hole sealing structure, which includes a sealing cover, a sealing ring, and an annular sealing groove formed on the outer side of the engine end cover; The annular sealing groove surrounds the mounting through hole; the sealing cover includes a cover body, an annular flange extending radially outward from the peripheral edge of the bottom end of the side wall of the cover body, and an annular flange bent toward the top from the outer peripheral edge of the annular flange; the top wall of the cover body covers the mounting through hole, the side wall of the cover body extends into the annular sealing groove, and the annular flange is interference fit with the outer side surface of the annular sealing groove so that the side wall of the cover body presses the sealing ring against the inner side surface of the annular sealing groove.

16. The engine end cover integrated oil pump assembly according to claim 15, characterized in that: The vertical cross section of the annular flange is wave-shaped.

17. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The oil pump is a variable displacement oil pump, which includes a proportional solenoid valve or a switching solenoid valve. The inlet of the proportional solenoid valve or the switching solenoid valve is connected to the main oil channel of the engine lubrication system, and the outlet of the proportional solenoid valve or the switching solenoid valve is connected to the feedback chamber of the variable displacement oil pump.

18. The engine end cover integrated oil pump assembly according to claim 10, characterized in that: The oil pump is a vane pump, a cycloid rotor pump, a gear pump, a pendulum vane pump or a hinged vane pump.

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