WO2026032006A1 - Ensemble pompe à huile, moteur, groupe motopropulseur hybride et véhicule - Google Patents

Ensemble pompe à huile, moteur, groupe motopropulseur hybride et véhicule

Info

Publication number
WO2026032006A1
WO2026032006A1 PCT/CN2025/109585 CN2025109585W WO2026032006A1 WO 2026032006 A1 WO2026032006 A1 WO 2026032006A1 CN 2025109585 W CN2025109585 W CN 2025109585W WO 2026032006 A1 WO2026032006 A1 WO 2026032006A1
Authority
WO
WIPO (PCT)
Prior art keywords
oil
oil passage
pump
passage
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/109585
Other languages
English (en)
Chinese (zh)
Inventor
郑俊丽
黄英军
唐睿杰
宋仁玉
余锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BYD Co Ltd
Original Assignee
BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Publication of WO2026032006A1 publication Critical patent/WO2026032006A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/20—Rotary pumps

Definitions

  • This disclosure relates to the field of vehicle technology, and in particular to an oil pump assembly, an engine, a hybrid powertrain, and a vehicle.
  • oil pumps deliver lubricating oil from the oil tank to the lubrication points, providing necessary lubrication and cooling for the operation of the equipment, reducing friction and wear of mechanical parts, and extending the service life of the machinery.
  • oil pumps can pressurize lubricating oil and pump it to various components (such as bearings) to lubricate the vehicle's parts.
  • This disclosure proposes an oil pump assembly that can guide oil from the supply pump to the return pump shaft inside the return pump, thereby accelerating the oil circulation speed and cooling effect, and thus improving the lubrication effect on the return pump shaft.
  • an oil pump assembly in a first aspect, includes a supply pump and a return pump.
  • the supply pump has a supply chamber; the return pump is connected to the supply pump and includes a return pump housing and a return pump shaft.
  • the return pump shaft is disposed within the return pump housing, which has a lubricating oil passage.
  • the lubricating oil passage communicates with the supply chamber and has at least one lubricating oil port leading to the return pump shaft.
  • the oil in the supply pump can be guided to the return pump shaft inside the return pump, thereby accelerating the oil circulation speed and cooling effect, improving the lubrication effect on the return pump shaft, and extending the service life of the oil pump assembly.
  • the return oil pump shaft includes a first rotating shaft and a second rotating shaft.
  • the second rotating shaft and the first rotating shaft are engaged by at least one set of meshing gears.
  • the at least one lubricating oil port includes a plurality of lubricating oil ports, a portion of which outlet oil toward the first rotating shaft, and another portion of which outlet oil toward the second rotating shaft.
  • the first rotating shaft is a driving shaft; the second rotating shaft is a driven shaft.
  • the plurality of lubrication ports include at least one first lubrication port and at least one second lubrication port. The at least one first lubrication port discharges oil toward the driving shaft, and the at least one second lubrication port discharges oil toward the driven shaft.
  • the lubricating oil passage includes: a first branch oil passage and a second branch oil passage.
  • the first branch oil passage is provided with at least one first lubricating oil port.
  • the second branch oil passage is provided with at least one second lubricating oil port.
  • the lubricating oil passage satisfies at least one of the following: the first branch oil passage includes a plurality of oil passage segments, the plurality of oil passage segments being axially spaced along the first rotation axis to define a clearance space; or, the second branch oil passage includes a plurality of oil passage segments, the plurality of oil passage segments being axially spaced along the second rotation axis to define the clearance space.
  • the drive shaft includes a first drive shaft and a second drive shaft connected sequentially along the length direction of the drive shaft.
  • the at least one first lubrication port includes a plurality of first lubrication ports, which respectively outlet oil toward the first drive shaft and the second drive shaft.
  • both ends of the first drive shaft and both ends of the second drive shaft are provided with first bearings, and the first bearings correspond to at least one first lubricating oil port.
  • both ends of the first drive shaft and both ends of the second drive shaft are provided with a first annular groove that mates with the first bearing.
  • the lubricating oil passage includes: a main oil passage, a first branch oil passage, and a second branch oil passage.
  • the main oil passage is in communication with the oil supply chamber.
  • the first branch oil passage is in communication with the main oil passage and is provided with at least one first lubricating oil port.
  • the second branch oil passage is in communication with the main oil passage and is provided with at least one second lubricating oil port.
  • the lubricating oil passage further includes a first branch oil passage.
  • the main oil passage is connected to the midpoint of the first branch oil passage, and the first branch oil passage and the second branch oil passage are respectively connected to the two ends of the first branch oil passage.
  • the first oil channel is configured as an arc shape that is low in the middle and high at both ends.
  • the lubrication passage further includes a third branch passage.
  • the third branch passage communicates with the first branch passage and is spaced apart from the second branch passage along the length of the driven shaft.
  • the third branch passage is provided with the at least one second lubrication port.
  • the driven shaft includes a first driven shaft and a second driven shaft connected sequentially along the length direction of the driven shaft.
  • the second lubricating oil port of the second branch oil passage exits oil towards the first driven shaft, and the at least one second lubricating oil port of the third branch oil passage exits oil towards the second driven shaft.
  • a second bearing is provided at both ends of the first driven shaft and both ends of the second driven shaft.
  • the second lubricating oil port of the second branch oil passage discharges oil toward the second bearing at one end of the first driven shaft
  • the at least one second lubricating oil port of the third branch oil passage includes at least three second lubricating oil ports, and the at least three second lubricating oil ports discharge oil toward the second bearing at the other end of the first driven shaft and the second bearings at both ends of the second driven shaft, respectively.
  • both ends of the first driven shaft and both ends of the second driven shaft are provided with second annular grooves that cooperate with the second bearing.
  • the lubricating oil passage further includes a second branch oil passage.
  • the second branch oil passage is connected to both the first branch oil passage and the third branch oil passage, with the first branch oil passage and the third branch oil passage respectively connected to both ends of the second branch oil passage.
  • the second oil channel is configured as an arc shape that is low in the middle and high at both ends.
  • the lubricating oil passage includes: a main oil passage, a first branch oil passage, and a second branch oil passage.
  • the main oil passage is connected to the oil supply chamber.
  • the first branch oil passage is connected to the main oil passage and is provided with at least one first lubricating oil port.
  • the second branch oil passage is connected to the first branch oil passage and is provided with at least one second lubricating oil port.
  • the main oil passage, the first branch oil passage, and the second branch oil passage are connected in series.
  • the lubricating oil passage includes: a main oil passage, a first branch oil passage, and a second branch oil passage.
  • the main oil passage is connected to the oil supply chamber.
  • the first branch oil passage is connected to the main oil passage and is provided with at least one first lubricating oil port.
  • the second branch oil passage is connected to the main oil passage and is provided with at least one second lubricating oil port.
  • the first branch oil passage and the second branch oil passage are connected in parallel to the main oil passage.
  • the oil supply pump includes an oil supply pump shaft, and the drive shaft is connected to the oil supply pump shaft.
  • the oil supply pump includes an oil supply pump shaft, and the drive shaft is integrally formed with the oil supply pump shaft.
  • the return pump housing includes a pump body and a pump cover.
  • the pump cover is disposed on the side of the pump body away from the supply pump, and the lubricating oil passage is formed in the pump body and the pump cover.
  • the lubricating oil passage has a pump body outlet on the pump body and a pump cover inlet on the pump cover.
  • the pump body outlet communicates with the pump cover inlet, and the cross-sectional area of the pump body outlet is larger than the cross-sectional area of the pump cover inlet.
  • the bottom of the oil supply chamber is provided with an oil supply outlet, which is connected to the lubricating oil passage.
  • the engine includes the aforementioned oil pump assembly.
  • the hybrid powertrain includes the aforementioned engine.
  • the hybrid powertrain further includes an electric motor assembly.
  • the engine is located above the electric motor assembly, and the engine includes a body and an oil pan, with the oil pan located between the body and the electric motor assembly.
  • An oil pump assembly is disposed within the oil pan.
  • the return oil pump shaft includes a drive shaft and a driven shaft, which are horizontally spaced apart.
  • the vehicle includes the aforementioned hybrid powertrain.
  • Figure 1 is a partial structural diagram of an oil pump assembly according to some embodiments
  • Figure 2 is another partial structural diagram of the oil pump assembly according to some embodiments.
  • Figure 3 is a structural diagram of the lubrication oil passage of an oil pump assembly according to some embodiments.
  • Figure 4 is another structural diagram of the lubrication oil passage of the oil pump assembly according to some embodiments.
  • Figure 5 is another structural diagram of the lubrication passage of the oil pump assembly according to some embodiments.
  • Figure 6 is another structural diagram of the lubrication passage of the oil pump assembly according to some embodiments.
  • Figure 7 is a structural diagram of the oil pump section of the oil pump assembly according to some embodiments.
  • Figure 8 is a block diagram of an engine according to some embodiments.
  • Figure 9 is a block diagram of a hybrid powertrain according to some embodiments.
  • Figure 10 is a block diagram of a vehicle according to some embodiments.
  • FIG. 1 Vehicle; 2000, Hybrid powertrain; 1000, Engine; 100, Oil pump assembly; 1. Oil supply pump; 11. Oil supply chamber; 12. Oil supply pump shaft; 13. Oil tank; 2. Return oil pump; 21. Return oil pump housing; 211. Lubricating oil passage; 2111. Lubricating oil port; 21111. First lubricating oil port; 21112. Second lubricating oil port; 2112. Main oil passage; 2113. First branch oil passage; 2114. Second branch oil passage; 2115. First sub-branch oil passage; 2116. Third branch oil passage; 2117. Second sub-branch oil passage; 212. Pump body; 2121. Pump body outlet; 2131. Pump cover inlet; 2132. Pump cover outlet; 214. Flange face; 22. Return oil pump shaft; 221. Drive shaft; 2211. First drive shaft; 2212. Second drive shaft; 2213. First annular groove; 222, driven shaft; 2221, first driven shaft; 2222, second driven shaft; 2223, second annular groove.
  • the active bearing lubrication system in an oil pump requires a motor to power the oil pump, thereby achieving the desired lubrication effect.
  • this design suffers from the problem of insufficient motor power or power line failure preventing bearing lubrication, thus affecting the oil pump's efficiency and service life.
  • the arrangement of the lubrication channels within the rotor shaft assembly leads to increased rotor wall temperature during high-speed rotation, causing the lubricating oil to remain at a consistently high temperature. This accelerates oil deterioration, impairs lubrication of the bearings, and ultimately reduces the oil pump's lifespan.
  • some embodiments of this disclosure provide an oil pump assembly 100.
  • the oil pump assembly 100 according to some embodiments of the present disclosure is described below with reference to Figures 1 to 7.
  • the oil pump assembly 100 can guide oil in the supply pump 1 to the return pump shaft 22 inside the return pump 2, thereby accelerating the circulation speed and cooling effect of the oil, and thus improving the lubrication effect on the return pump shaft 22.
  • the oil pump assembly 100 mainly includes a supply pump 1 and a return pump 2.
  • the supply pump 1 e.g., a gear pump
  • the return pump 2 is used to collect the oil in the engine and return it to the oil tank or oil pan for recirculation.
  • the return pump 2 may also have a filtering function to remove impurities from the oil, keep the oil clean, and extend the service life of the system.
  • the oil supply pump 1 has an oil supply chamber 11, and the return oil pump 2 is connected to the oil supply pump 1.
  • the return oil pump 2 includes a return oil pump housing 21 and a return oil pump shaft 22, with the return oil pump shaft 22 disposed within the return oil pump housing 21.
  • the return oil pump housing 21 has a lubricating oil passage 211, which communicates with the oil supply chamber 11, and has a lubricating oil port 2111 that outlets oil toward the return oil pump shaft 22.
  • one oil supply pump 1 is connected in series with four return oil pumps 2.
  • the oil supply pump 1 has an oil supply chamber 11 for storing oil, and the return oil pump 2 is connected to the oil supply pump 1 through mutual drive.
  • the return oil pump housing 21 can protect the internal structural components of the return oil pump 2, preventing interference from external structures and thus ensuring the normal operation and stability of the internal structural components of the return oil pump 2.
  • the oil supply chamber 11 is the high-pressure chamber of the oil supply pump 1.
  • the oil supply chamber 11 is the output oil chamber of the oil supply pump 1, and the oil is pressurized in the oil supply chamber. This ensures that the oil in the oil supply chamber 11 is continuously and stably delivered to the lubrication oil passage 211 under the action of pressure difference, thereby ensuring the lubrication effect.
  • the return pump shaft 22 can transmit external power to related internal structures (such as gears, blades, or rotors), enabling the moving parts to rotate and generate suction force.
  • the return pump shaft 22 drives the rotor, gears, or blades inside the return pump 2, creating a negative pressure area within the housing to draw in oil and squeeze the oil on the other side, causing it to flow back to the oil tank or oil pan, thus driving oil flow.
  • the return pump shaft 22 also serves as a support structure for mounting bearings and other rotating components (such as seals), ensuring proper alignment and stable operation of these components.
  • the return oil pump housing 21 has a lubricating oil passage 211 that communicates with the oil supply chamber 11.
  • the oil supply pump 1 has a high pumping pressure, which increases the speed at which the oil flows through the oil supply chamber 11 and the lubricating oil passage 211 to the return oil pump shaft 22, thereby ensuring the lubrication requirements of the return oil pump shaft 22.
  • the oil supply chamber 11 can be directly connected to the lubrication oil passage 211, allowing oil to be directly supplied from the oil supply chamber 11 to the lubrication oil passage 211 and then returned; alternatively, the oil supply chamber 11 can also be indirectly connected to the lubrication oil passage 211.
  • a branch passage is provided on the main oil passage to connect to the lubrication oil passage 211, thus allowing oil to be supplied from the main oil passage to the lubrication oil passage 211 and then returned.
  • the engine's main oil passage also has multiple other branch passages, which connect to various moving parts to lubricate them.
  • lubrication is achieved by using oil with higher pressure in the oil supply pump 1 to flow to the return oil pump shaft 22. This can improve the circulation speed of the oil, thereby increasing the lubrication efficiency of the return oil pump shaft 22. On the other hand, it can also avoid the problem of lubrication jamming or untimely lubrication of the return oil pump shaft 22, thus ensuring the continuity and stability of lubrication work, and extending the service life of the return oil pump shaft 22 and the working efficiency of the return oil pump 2.
  • the oil pump assembly 100 can guide the oil in the oil supply pump 1 to the return pump shaft 22 inside the return pump 2, thereby accelerating the oil circulation speed and cooling effect, thereby improving the lubrication effect on the return pump shaft 22 and extending the service life of the oil pump assembly 100.
  • the return oil pump shaft 22 includes a first rotating shaft and a second rotating shaft, and the second rotating shaft and the first rotating shaft are connected by at least one set of meshing gears.
  • the lubricating oil passage 211 has a plurality of lubricating oil ports 2111, some of which discharge oil toward the first rotating shaft, and others of which discharge oil toward the second rotating shaft.
  • the first and second rotating shafts are driven by gear meshing, which enables the transmission of power and converts the mechanical energy generated by the driving force into the pressure energy of the fluid.
  • a portion of the lubrication ports 2111 on the lubrication passage 211 outlets oil towards the first rotating shaft, while another portion outlets oil towards the second rotating shaft.
  • the return oil pump shaft 22 has a hollow axial oil passage inside, one end of which communicates with the lubrication oil passage 211.
  • the outer surface of the return oil pump shaft 22 has a radial oil passage communicating with the axial oil passage. Oil enters the axial oil passage from the lubrication oil passage 211 and flows out through the radial oil passage to the location on the return oil pump shaft that requires lubrication, such as the bearing position supporting the return oil pump shaft 22.
  • the oil passage structure of the return oil pump housing 21 can be simplified, reducing the machining difficulty of the return oil pump housing 21.
  • the first rotating shaft is a driving shaft 221
  • the second rotating shaft is a driven shaft 222.
  • the lubrication passage 211 has a plurality of lubrication ports 2111, including a first lubrication port 21111 and a second lubrication port 21112.
  • the first lubrication port 21111 discharges oil toward the driving shaft 221, and the second lubrication port 21112 discharges oil toward the driven shaft 222.
  • the return oil pump 2 can be an external gear pump.
  • a drive gear is mounted on the drive shaft 221, and a driven gear is mounted on the driven shaft 222. All three gears are located within the same return oil chamber, and the drive gear and driven gear mesh with each other.
  • the drive shaft 221 is connected to an external power source, for example, a drive connection to the output shaft of an electric motor or an engine.
  • the driven shaft 222 rotates under the drive of the meshing gears, and the rotation of the gears also drives the flow of oil to return the oil.
  • by providing a first lubrication port 21111 and a second lubrication port 21112 these embodiments are applicable to external gear pumps where both the drive shaft 221 and the driven shaft 222 require lubrication.
  • a plurality of drive gears are provided on the drive shaft 221, and the plurality of drive gears are arranged sequentially at intervals along the axial direction of the drive shaft 221.
  • a plurality of driven gears are also provided on the driven shaft 222, and the plurality of driven gears are arranged sequentially at intervals along the axial direction of the driven shaft 222, thereby enabling the return oil pump 2 to form multiple return oil chambers, so that the return oil pump 2 can actively return oil from multiple positions of the engine.
  • the drive shaft 221 directly receives the rotational power transmitted from the electric motor or engine and transmits this power to the interior of the return oil pump 2; the driven shaft 222 works in cooperation with the drive shaft 221 inside the return oil pump 2, and the driven shaft 222 indirectly receives the rotational power through another gear (such as a driven gear) meshing with the gear (such as a drive gear) on the drive shaft 221.
  • the drive shaft 221 is the source of power and is responsible for driving the operation of the entire return oil pump 2; while the driven shaft 222, driven by the drive shaft 221, works in conjunction with the drive shaft 221 to perform the function of transporting fluid in the return oil pump 2. The two work together to ensure that the return oil pump 2 can effectively complete the return oil task in the hydraulic system.
  • first lubrication port 21111 and the second lubrication port 21112 on the lubrication passage 211 face the drive shaft 221 and the driven shaft 222, respectively. This ensures that both the drive shaft 221 and the driven shaft 222 are lubricated by the oil during operation, thereby improving the uniformity of lubrication between the drive shaft 221 and the driven shaft 222, avoiding the risk of large differences in wear caused by uneven lubrication on the two shafts, and thus ensuring the operational stability of the return oil pump 2.
  • the return oil pump shaft 22 may be only the first rotating shaft, with the lubricating oil port 2111 facing the first rotating shaft for oil discharge.
  • the return oil pump 2 may also be an internally meshing gear pump, centrifugal pump, piston pump, or other pump that only requires one rotating shaft.
  • the lubricating oil passage 211 can provide lubrication for various types of return oil pumps.
  • the lubricating oil passage 211 includes a first oil passage 2113 and a second oil passage 2114.
  • the first oil passage 2113 is provided with a first lubricating oil port 21111
  • the second oil passage 2114 is provided with a second lubricating oil port 21112.
  • the oil can be diverted to the first oil passage 2113 and the second oil passage 2114.
  • the first oil passage 2113 and the second oil passage 2114 can guide the direction and path of the oil flow, thereby achieving the effect of the oil flowing to the designated position and improving the accuracy of the lubrication position.
  • the first oil passage 2113 includes multiple oil passage segments, which are spaced apart along the axial direction of the first rotation axis to define a clearance space; or, the second oil passage 2114 includes multiple oil passage segments, which are spaced apart along the axial direction of the second rotation axis to define a clearance space; or, both the first oil passage 2113 and the second oil passage 2114 include multiple oil passage segments, which are spaced apart along the axial direction to define a clearance space.
  • the drive shaft 221 includes a first drive shaft 2211 and a second drive shaft 2212 connected sequentially along the length direction (e.g., axial direction) of the drive shaft 221.
  • the lubrication passage 211 has a plurality of first lubrication ports 21111, which respectively outlet oil toward the first drive shaft 2211 and the second drive shaft 2212.
  • first drive shaft 2211 and the second drive shaft 2212 are sequentially connected axially, and multiple first lubrication ports 21111 are respectively directed towards the first drive shaft 2211 and the second drive shaft 2212 to discharge oil.
  • first bearings are provided at both ends of the first drive shaft 2211 and both ends of the second drive shaft 2212, and each first bearing corresponds to at least one first lubrication port 21111.
  • the first bearings can support the first drive shaft 2211 and the second drive shaft 2212, ensuring that the first drive shaft 2211 and the second drive shaft 2212 can rotate smoothly and accurately, thereby improving the working stability and durability of the return oil pump 2.
  • some embodiments of this disclosure can also provide support for the long drive shaft 221 at multiple positions, ensuring the strength and smooth movement of the drive shaft 221.
  • each first bearing has at least one first lubrication port 21111, which can introduce the lubricating oil in the oil supply chamber 11 to the first bearing, thereby providing key lubrication for the first bearing supporting the first drive shaft 2211 and the second drive shaft 2212, effectively improving the lubrication effect at the first bearing, reducing the wear at the connection between the first bearing and the first drive shaft 2211 and the second drive shaft 2212, and thus ensuring the working stability and reliability of the return oil pump shaft 22.
  • both ends of the first drive shaft 2211 and both ends of the second drive shaft 2212 are provided with a first annular groove 2213 that mates with the first bearing.
  • the first bearing and the first annular groove 2213 can establish an axial limiting fit. This ensures the positional stability of the first bearing and facilitates the flow of oil along the first annular groove 2213, thereby providing sufficient lubrication to the joints of the first bearing with the first drive shaft 2211 and the second drive shaft 2212. Furthermore, the first annular groove 2213 restricts the axial diffusion of oil to its outer side, allowing for more uniform lubrication of the joints between the first bearing and the first drive shaft 2211 and the second drive shaft 2212, thus improving the lubrication uniformity and efficiency of the return oil pump shaft 22. In addition, the first annular groove 2213 also accelerates the heat dissipation of the oil.
  • the lubricating oil passage 211 includes a main oil passage 2112, a first branch oil passage 2113, and a second branch oil passage 2114.
  • the main oil passage 2112 communicates with the oil supply chamber 11, and the first branch oil passage 2113 communicates with the main oil passage 2112, and the first branch oil passage 2113 is provided with a first lubricating oil port 21111.
  • the second branch oil passage 2114 communicates with the main oil passage 2112, and the second branch oil passage 2114 is provided with a second lubricating oil port 21112.
  • the oil flowing from the oil supply chamber 11 to the main oil passage 2112 can be guided to flow into the first oil passage 2113 and the second oil passage 2114, respectively. Furthermore, the oil can flow along the first lubrication port 21111 of the first oil passage 2113 and the second lubrication port 21112 of the second oil passage 2114 to the drive shaft 221 and the driven shaft 222, respectively.
  • This increases the number of oil outlet positions along the axial direction of the drive shaft 221 and the driven shaft 222, improves the lubrication uniformity of the drive shaft 221 and the driven shaft 222, avoids insufficient lubrication of either the drive shaft 221 or the driven shaft 222, and thus ensures the operational stability of the return oil pump 2.
  • the first branch oil passage 2113 is connected to the main oil passage 2112, including both the case where the first branch oil passage 2113 and the main oil passage 2112 are directly connected and the case where the first branch oil passage 2113 and the main oil passage 2112 are indirectly connected through other oil passages.
  • the second branch oil passage 2114 is connected to the main oil passage 2112, including both the case where the second branch oil passage 2114 and the main oil passage 2112 are directly connected and the case where the second branch oil passage 2114 and the main oil passage 2112 are indirectly connected through other oil passages.
  • the lubricating oil passage 211 includes a main oil passage 2112, a first branch oil passage 2113, and a second branch oil passage 2114.
  • the main oil passage 2112 communicates with the oil supply chamber 11
  • the first branch oil passage 2113 communicates with the main oil passage 2112 and is provided with a first lubricating oil port 21111.
  • the second branch oil passage 2114 communicates with the first branch oil passage 2113 and is provided with a second lubricating oil port 21112.
  • the main oil passage 2112, the first branch oil passage 2113, and the second branch oil passage 2114 are connected in series.
  • the oil can be sequentially transported back along the main oil passage 2112, the first branch oil passage 2113, and the second branch oil passage 2114.
  • the main oil passage 2112, the first branch oil passage 2113, and the second branch oil passage 2114 are connected in series, which simplifies the internal oil passages of the return oil pump housing 21 and reduces the machining difficulty of the return oil pump housing 21.
  • the lubricating oil passage 211 includes a main oil passage 2112, a first branch oil passage 2113, and a second branch oil passage 2114.
  • the main oil passage 2112 communicates with the oil supply chamber 11.
  • the first branch oil passage 2113 communicates with the main oil passage 2112 and is provided with a first lubricating oil port 21111.
  • the second branch oil passage 2114 communicates with the main oil passage 2112 and is provided with a second lubricating oil port 21112.
  • the first branch oil passage 2113 and the second branch oil passage 2114 are connected in parallel to the main oil passage 2112.
  • the oil in the main channel is diverted by the first oil passage 2113 and the second oil passage 2114, the oil can be uniformly and simultaneously delivered to the drive shaft 221 and the driven shaft 222 for lubrication, thereby improving the synchronicity and uniformity of lubrication, and thus improving the smoothness of the start-up of the return oil pump 2.
  • the lubricating oil passage 211 further includes a first branch oil passage 2115.
  • the main oil passage 2112 is connected to the midpoint of the first branch oil passage 2115, and the first branch oil passage 2113 and the second branch oil passage 2114 are respectively connected to the two ends of the first branch oil passage 2115.
  • the midpoint of the first branch oil passage 2115 connects to the main oil passage 2112, and the two ends of the first branch oil passage 2115 connect to the first sub-oil passage 2113 and the second sub-oil passage 2114, respectively.
  • the first branch oil passage 2115 can change the extension direction of the main oil passage 2112 and increase the radial extension path of the lubricating oil passage 211 along the main oil passage 2112, thereby facilitating the flow of oil through the first branch oil passage 2115 to a position close to the drive shaft 221 and the driven shaft 222, thus improving the rationality of the arrangement of the lubricating oil passage 211.
  • the first oil channel 2115 can be constructed as an arc shape, lower in the middle and higher at both ends. This arrangement can increase the flow rate of the oil within the first oil channel 2115. The reason is that the arc-shaped flow channel can reduce the resistance to oil flow and reduce energy loss.
  • the lubricating oil passage 211 further includes a third oil passage 2116.
  • the third oil passage 2116 communicates with the first oil passage 2113, and the third oil passage 2116 and the second oil passage 2114 are arranged at intervals along the length direction (e.g., axial direction) of the driven shaft 222.
  • the third oil passage 2116 is provided with a second lubricating oil port 21112.
  • the third oil passage 2116 is connected to the first oil passage 2113, and the third oil passage 2116 is provided with a second lubrication port 21112 facing the driven shaft 222.
  • the oil flows through the second lubrication port 21112 on the third oil passage 2116 to the shaft end of the driven shaft 222 axially away from the oil supply pump 1, thus prioritizing the lubrication of the drive shaft 221 (since the drive shaft 221 is the driving shaft). This reduces the starting resistance of the drive shaft 221, making the start-up of the return oil pump 2 smoother.
  • the third oil passage 2116 and the second oil passage 2114 are arranged at intervals along the length of the driven shaft 222, and the aforementioned clearance space can be formed between the second oil passage 2114 and the third oil passage 2116. Since there are areas of the return pump housing 21 with thin walls where oil passages cannot be installed (for example, the return pump housing 21 needs to avoid some other structures, resulting in a thin housing that cannot accommodate oil passages), oil passages do not need to be installed in such areas. This avoids related structural components and improves the rationality of the spatial arrangement.
  • the driven shaft 222 includes a first driven shaft 2221 and a second driven shaft 2222 connected sequentially along the length direction of the driven shaft 222.
  • the second lubricating oil port 21112 of the second oil passage 2114 exits oil toward the first driven shaft 2221, and the second lubricating oil port 21112 of the third oil passage 2116 exits oil toward the second driven shaft 2222.
  • first driven shaft 2221 and the second driven shaft 2222 are sequentially connected axially, and multiple second lubrication ports 21112 respectively face the first driven shaft 2221 and the second driven shaft 2222 to discharge oil.
  • the driven shaft 222 is set as a multi-segment structure, which can effectively avoid the problem of difficulty in production, processing and assembly caused by the excessive length of the driven shaft 222.
  • second bearings are provided at both ends of the first driven shaft 2221 and both ends of the second driven shaft 2222.
  • the second lubrication port 21112 of the second oil passage 2114 discharges oil toward the second bearing at one end of the first driven shaft 2221.
  • the third oil passage 2116 is provided with at least three second lubrication ports 21112, and these at least three ports discharge oil toward the second bearing at the other end of the first driven shaft 2221 and the second bearings at both ends of the second driven shaft 2222, respectively.
  • the second bearing can support the first driven shaft 2221 and the second driven shaft 2222, ensuring that the first driven shaft 2221 and the second driven shaft 2222 can rotate smoothly and accurately, thereby improving the working stability and durability of the return oil pump 2. Furthermore, when the return oil pump 2 needs to be equipped with multiple return oil chambers, resulting in a long driven shaft 222, some embodiments of this disclosure can also provide support for the long driven shaft 222 at multiple locations, ensuring the strength and smooth movement of the driven shaft 222.
  • the second oil passage 2114 and the third oil passage 2116 each have a second lubrication port 21112 corresponding to the second bearings on the first driven shaft 2221 and the second driven shaft 2222.
  • This allows the lubricating oil in the oil supply chamber 11 to be introduced to the second bearings, thus providing focused lubrication to the second bearings supporting the first driven shaft 2221 and the second driven shaft 2222.
  • This effectively improves the lubrication effect at the second bearings, reduces wear at the connection between the second bearing and the first driven shaft 2221 and the second driven shaft 2222, and ultimately ensures the operational stability and reliability of the return oil pump shaft 22.
  • both ends of the first driven shaft 2221 and both ends of the second driven shaft 2222 are provided with a second annular groove 2223 that mates with the second bearing.
  • the second bearing and the second annular groove 2223 can establish an axial limiting fit. This ensures the positional stability of the second bearing and facilitates the flow of oil along the second annular groove 2223, thereby providing sufficient lubrication to the joints between the second bearing and the first driven shaft 2221 and the second driven shaft 2222. Furthermore, the second annular groove 2223 restricts the axial diffusion of oil to the outside of the annular groove, allowing for more uniform lubrication of the joints between the second bearing and the first driven shaft 2221 and the second driven shaft 2222, thus improving the lubrication uniformity and efficiency of the return oil pump shaft 22. In addition, the second annular groove 2223 also accelerates the heat dissipation of the oil.
  • the lubricating oil passage 211 further includes a second branch oil passage 2117.
  • the second branch oil passage 2117 is connected to the first branch oil passage 2113 and the third branch oil passage 2116 respectively, and the first branch oil passage 2113 and the third branch oil passage 2116 are respectively connected to the two ends of the second branch oil passage 2117.
  • the two ends of the second oil passage 2117 are connected to the first oil passage 2113 and the third oil passage 2116, respectively.
  • the second oil passage 2117 can change the extension direction of the first oil passage 2113 and increase the extension path of the first oil passage 2113 toward the third oil passage 2116, thereby facilitating the flow of oil through the second oil passage 2117 to a position close to the driven shaft 222 and away from the oil supply pump 1 along the axial direction, thereby improving the rationality of the arrangement of the lubrication passage 211.
  • the second oil channel 2117 can be constructed as an arc shape, lower in the middle and higher at both ends. This arrangement can increase the flow rate of the oil within the second oil channel 2117. The reason is that the arc-shaped flow channel can reduce the resistance to oil flow and reduce energy loss.
  • the return oil pump housing 21 includes a pump body 212 and a pump cover, the pump cover being disposed on the side of the pump body 212 away from the oil supply pump 1, and a lubricating oil passage 211 being formed in the pump body 212 and the pump cover.
  • the pump cover can be fitted onto the pump body 212 (i.e., the pump cover is mounted on the flange face 214) to ensure the sealing of the return oil pump 2 and prevent liquid leakage or external contaminants from entering the return oil pump 2. Furthermore, by forming the lubricating oil passage 211 on the pump body 212 and the pump cover, on the one hand, the lubricating oil passage 211 is relatively far from the return oil pump shaft 22, thereby reducing the temperature rise of the oil caused by the high temperature generated by the high-speed rotation of the return oil pump shaft 22, ensuring oil quality. On the other hand, the sealing between the pump cover and the pump body 212 can maintain the pressure and purity inside the lubricating oil passage 211, thereby ensuring the high efficiency and stability of lubrication operation.
  • the lubricating oil passage 211 has a pump body outlet 2121 on the pump body 212, and the lubricating oil passage 211 has a pump cover inlet 2131 on the pump cover.
  • the pump body outlet 2121 communicates with the pump cover inlet 2131, and the cross-sectional area of the pump body outlet 2121 is larger than the cross-sectional area of the pump cover inlet 2131.
  • the lubricating oil passage 211 is provided with a pump body outlet 2121 and a pump cover inlet 2131 on the pump body 212 and the pump cover, respectively.
  • the pump body outlet 2121 is connected to the pump cover inlet 2131
  • the pump cover inlet 2131 is connected to the pump cover outlet 2132 (as shown in Figure 6).
  • the oil supply pump 1 collects the oil flowing out of the return oil pump 2, thus completing the oil circulation effect.
  • the cross-sectional area of the pump body outlet 2121 is larger than that of the pump cover inlet 2131. This causes the oil pressure to increase further during the flow of the oil from the pump body outlet 2121 to the pump cover inlet 2131, thereby effectively accelerating the oil circulation speed and improving the lubrication effect of the drive shaft 221 and the driven shaft 222.
  • the oil supply pump 1 includes an oil supply pump shaft 12.
  • a drive shaft 221 is connected to the oil supply pump shaft 12. It is understood that the oil supply pump shaft 12 and the drive shaft 221 are connected in a driving manner, thus transmitting the driving force on the oil supply pump shaft 12 to the drive shaft 221, thereby driving the moving parts (such as gears, blades, or rotors) on the drive shaft 221 to operate, thereby achieving the fluid transport effect of the return oil pump 2.
  • the oil supply pump 1 can guide oil to the oil supply pump shaft 12 of the oil supply pump 1 through the oil trough 13, thereby providing lubrication for the oil supply pump shaft 12.
  • the fuel pump 1 includes a fuel pump shaft 12, and the drive shaft 221 is integrally formed with the fuel pump shaft 12. This arrangement allows the engine crankshaft to drive both the fuel pump shaft 12 and the drive shaft 221 simultaneously, thereby improving transmission efficiency.
  • an oil supply outlet is provided at the bottom of the oil supply chamber 11, and the oil supply outlet is connected to the lubricating oil passage 211.
  • the oil supply outlet connects the lubricating oil passage 211 and the oil supply chamber 11, thereby facilitating the smooth flow of oil in the oil supply chamber 11 to the oil supply channel through the oil supply outlet, thus ensuring the effectiveness of the oil supply pump 1 in delivering oil to the return oil pump 2.
  • This disclosure also provides an engine 1000 in some embodiments.
  • the engine 1000 includes the oil pump assembly 100 described above.
  • the oil pump assembly 100 can improve the operational reliability and durability of the engine.
  • the hybrid powertrain 2000 includes the aforementioned engine 1000. This engine improves the operational reliability and stability of the hybrid powertrain.
  • the hybrid powertrain also includes an electric motor assembly.
  • the engine is located above the electric motor assembly.
  • the engine includes a block and an oil pan.
  • the oil pan is located between the block and the electric motor assembly.
  • the oil pump assembly 100 is disposed within the oil pan, and the return oil pump shaft 22 includes a drive shaft 221 and a driven shaft 222, which are spaced apart horizontally.
  • up and down refers to the vertical direction when the vehicle is traveling on a flat road
  • horizontal is based on the horizontal direction when the vehicle is traveling on a flat road.
  • the drive shaft 221 and driven shaft 222 are arranged at intervals in the horizontal direction, which reduces the longitudinal height requirement of the oil pan, thereby reducing the height dimension of the hybrid powertrain in the vertical direction and improving the integration of the hybrid powertrain.
  • the vehicle 3000 includes the above-described hybrid powertrain 2000.
  • This hybrid powertrain can thus improve the vehicle's operational reliability and stability, thereby enhancing its market competitiveness.
  • center In the description of this disclosure, it should be understood that the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
  • first feature and “second feature” may include one or more of the features.
  • first feature being “above” or “below” the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.
  • the terms “above,” “over,” and “on top” for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.
  • connection should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components.
  • connection should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components.
  • references to terms such as “one embodiment,” “some embodiments,” “illustrative embodiment,” “example,” “specific example,” or “some examples,” etc. refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure.
  • the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.
  • At least one of A, B and C has the same meaning as “at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

Ensemble pompe à huile, moteur, groupe motopropulseur hybride et véhicule. L'ensemble pompe à huile comprend : une pompe d'alimentation en huile et une pompe de retour d'huile. Une cavité d'alimentation en huile est formée dans la pompe d'alimentation en huile ; la pompe de retour d'huile est reliée à la pompe d'alimentation en huile, et la pompe de retour d'huile comprend un corps de pompe de retour d'huile et un arbre de pompe de retour d'huile. L'arbre de pompe de retour d'huile est disposé dans le corps de pompe de retour d'huile, et un passage d'huile lubrifiante est formé dans le corps de pompe de retour d'huile. Le passage d'huile lubrifiante est en communication avec la cavité d'alimentation en huile, et le passage d'huile lubrifiante comporte au moins un orifice d'huile lubrifiante pour évacuer l'huile vers l'arbre de pompe de retour d'huile.
PCT/CN2025/109585 2024-08-08 2025-07-21 Ensemble pompe à huile, moteur, groupe motopropulseur hybride et véhicule Pending WO2026032006A1 (fr)

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CN202411090827.6A CN121497457A (zh) 2024-08-08 2024-08-08 油泵总成、发动机、混动总成以及车辆
CN202411090827.6 2024-08-08

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WO2026032006A1 true WO2026032006A1 (fr) 2026-02-12

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606623A (zh) * 2011-01-18 2012-07-25 哈米尔顿森德斯特兰德公司 具有压力加载通道的润滑油隔离轴承
CN105593478A (zh) * 2014-09-11 2016-05-18 马自达汽车株式会社 发动机的机油供应装置
JP2019002438A (ja) * 2017-06-13 2019-01-10 三菱自動車工業株式会社 クランク軸受の給油構造
CN111691945A (zh) * 2019-03-15 2020-09-22 丰田自动车株式会社 润滑油供给构造
CN211777635U (zh) * 2019-11-05 2020-10-27 新乡航空工业(集团)有限公司 一种可实现滑油泵尾部轴向出油的结构
CN216619298U (zh) * 2021-11-05 2022-05-27 新乡航空工业(集团)有限公司 一种滑油泵轴承润滑结构
CN117128066A (zh) * 2023-08-18 2023-11-28 上海汽车集团股份有限公司 一种发动机的润滑系统及其控制方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102606623A (zh) * 2011-01-18 2012-07-25 哈米尔顿森德斯特兰德公司 具有压力加载通道的润滑油隔离轴承
CN105593478A (zh) * 2014-09-11 2016-05-18 马自达汽车株式会社 发动机的机油供应装置
JP2019002438A (ja) * 2017-06-13 2019-01-10 三菱自動車工業株式会社 クランク軸受の給油構造
CN111691945A (zh) * 2019-03-15 2020-09-22 丰田自动车株式会社 润滑油供给构造
CN211777635U (zh) * 2019-11-05 2020-10-27 新乡航空工业(集团)有限公司 一种可实现滑油泵尾部轴向出油的结构
CN216619298U (zh) * 2021-11-05 2022-05-27 新乡航空工业(集团)有限公司 一种滑油泵轴承润滑结构
CN117128066A (zh) * 2023-08-18 2023-11-28 上海汽车集团股份有限公司 一种发动机的润滑系统及其控制方法

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