Cooling and lubricating structure for power coupling device and power coupling device

Abstract

The present invention provides a cooling and lubricating structure for a power coupling device and a power coupling device, comprising an input shaft oil passage arranged in an input shaft, a first oil hole arranged on the outer wall of the input shaft, a second oil hole arranged on the outer wall of the input shaft, a first oil circuit connected to the first oil hole at one end, and a second oil circuit connected to the second oil hole at one end, the other end of the first oil circuit extends to the planetary gear of the planetary row, and the other end of the second oil circuit extends to the synchronous element of the clutch. The cooling and lubricating structure has two cooling and lubricating paths, the first path is that the oil enters the input shaft oil passage and then passes through the first oil hole and the first oil passage to reach the position of the planetary gear to cool and lubricate the planetary gear; the second path is that the oil enters the input shaft oil passage and then passes through the second oil hole and the second oil passage to reach the position of the synchronous element of the clutch to cool the synchronous element of the clutch. The cooling and lubricating structure can reduce the spatial size of the system and reduce the weight of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile power coupling devices, and in particular relates to a cooling and lubricating structure for a power coupling device and a power coupling device. Background Art

[0002] With the shortage of oil resources, the improvement of people's environmental awareness, and the increasingly stringent requirements of environmental protection regulations, there is an urgent need for green and environmentally friendly automobile products that can save energy and have low or even zero emissions. To this end, governments around the world and major automobile manufacturers are stepping up efforts to develop various types of new energy vehicles, such as pure electric vehicles and hybrid vehicles.

[0003] Compared with traditional pure fuel vehicles with a single internal combustion engine, hybrid vehicles refer to vehicles that use more than two energy sources. As one of the auxiliary systems, the cooling and lubrication system of hybrid vehicles is one of the main technologies of the entire hybrid system and is also the key to the stable operation of the entire hybrid system.

[0004] From the hybrid models that have been put on the market, Toyota's Prius uses a dual-motor hybrid drive system. This system must comprehensively consider the power transmission performance indicators, and also realize the integration of structure and function, so as to achieve miniaturization, lightness, intelligence and modularization. The system uses lubricating oil to lubricate the relevant parts inside the shell and a cooling water jacket is set on the shell to cool the entire system through cooling water circulation. BYD F3DM also uses a dual-motor drive system. The system configuration is simpler than that of the Prius system, and the lubrication and cooling method similar to that of the Prius is used to lubricate and cool the entire system.

[0005] It can be seen that the housing of the existing hybrid vehicle lubrication and cooling system requires more complex processes and manufacturing requirements, resulting in reduced production efficiency, increased manufacturing costs, and large system size and weight. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the fact that the shell of the lubrication and cooling system of the existing hybrid electric vehicle requires more complex processes and manufacturing requirements, resulting in the problems of large system space size and heavy weight, a cooling and lubrication structure and a power coupling device are provided for a power coupling device.

[0007] To solve the above technical problems, on the one hand, an embodiment of the present invention provides a cooling and lubrication structure for a power coupling device, the power coupling device includes an input shaft, a planetary gear and a clutch, the planetary gear includes a sun gear, a planetary gear, a planetary carrier and a ring gear, the planetary gear is meshed between the sun gear and the ring gear, the sun gear is fixed on the input shaft, the cooling and lubrication structure for the power coupling device includes an input shaft oil channel arranged in the input shaft and extending along its axial direction, a first oil hole and a second oil hole arranged on the outer wall of the input shaft and connected to the input shaft oil channel, a first oil circuit connected to the first oil hole at one end, and a second oil circuit connected to the second oil hole at one end, the other end of the first oil circuit extends to the planetary gear to cool and lubricate the planetary gear, and the other end of the second oil circuit extends to the synchronous element of the clutch to cool and lubricate the synchronous element of the clutch.

[0008] Optionally, the planetary gear is rotatably supported on the planetary carrier via a pin shaft, a sleeve is sleeved on the input shaft on one axial side of the sun gear, the inner ring of the sleeve is fixed on the input shaft, the outer ring of the sleeve abuts against the inner wall of the planetary carrier, the sleeve is provided with a sleeve oil passage, the planetary carrier is provided with a planetary carrier oil passage, the pin shaft is provided with a pin shaft oil passage extending along its axial direction, the outer wall of the pin shaft is provided with a pin shaft oil inlet hole and a pin shaft oil outlet hole, the sleeve oil passage, the planetary carrier oil passage, the pin shaft oil inlet hole, the pin shaft oil passage and the pin shaft oil outlet hole are connected in sequence to form the first oil circuit.

[0009] Optionally, the inner surface of the sleeve is provided with an inner annular groove of the sleeve which is recessed radially outward, and the outer surface of the sleeve is provided with an outer annular groove of the sleeve which is recessed radially inward at a position corresponding to the inner annular groove of the sleeve, the sleeve oil channel is connected between the inner annular groove of the sleeve and the outer annular groove of the sleeve, and the outer annular groove of the sleeve is connected with the inner end opening of the planetary carrier oil channel.

[0010] Optionally, the outer surface of the pin shaft is provided with a pin shaft outer annular groove which is recessed radially inward, the pin shaft oil inlet hole is connected between the pin shaft outer annular groove and the pin shaft oil passage, and the pin shaft outer annular groove is connected with the outer end opening of the planetary carrier oil passage.

[0011] Optionally, the included angle between the central axis of the sleeve oil passage and the central axis of the input shaft is an acute angle, and the sleeve oil passage gradually inclines toward the sun gear from its inner end opening to its outer end opening.

[0012] Optionally, a planetary wheel bearing is arranged between the planetary wheel and the pin shaft, and the oil outlet hole of the pin shaft is radially opposite to the inner ring of the planetary wheel bearing to cool and lubricate the planetary wheel bearing and the planetary wheel.

[0013] Optionally, the ring gear includes a disc portion and a ring tooth portion connected to one axial side of the outer edge of the disc portion, a first through hole for the input shaft to pass through is arranged at the center of the disc portion, the disc portion and the sleeve are located on both axial sides of the sun gear, the hub of the clutch is located on the axial side of the disc portion away from the sun gear, and a second through hole for the input shaft to pass through is arranged at the center of the clutch hub.

[0014] Optionally, a radial hole of the ring gear is provided on the ring tooth portion, which is opposite to the synchronizing element of the clutch, and the second oil circuit includes a first branch oil circuit, and the radial hole of the ring gear is connected to the internal space of the ring gear to form the first branch oil circuit, one end of the first branch oil circuit is connected to the second oil hole, and the other end of the first branch oil circuit extends to the synchronizing element of the clutch.

[0015] Optionally, the second oil circuit includes a second branch oil circuit, the gap between the disc portion and the hub of the clutch constitutes the second branch oil circuit, one end of the second branch oil circuit is connected to the second oil hole, and the other end of the second branch oil circuit extends to the synchronizing element of the clutch.

[0016] The cooling and lubrication structure for the power coupling device of the embodiment of the present invention has two cooling and lubrication paths. The first path is that the oil enters the input shaft oil passage and then passes through the first oil hole and the first oil passage to reach the planetary gear position of the planetary gear to cool and lubricate the planetary gear; the second path is that the oil enters the input shaft oil passage and then passes through the second oil hole and the second oil passage to reach the synchronizing element position of the clutch to cool the synchronizing element of the clutch. It can be seen that the cooling and lubrication structure integrates the lubrication and cooling functions of the planetary gear and the clutch, forming a highly integrated cooling and lubrication structure, which can reduce the spatial size of the system and reduce the weight of the system.

[0017] This cooling and lubrication structure ensures that the planetary gear and the clutch can be forced to cool with oil under various driving conditions of the vehicle, meets the heat dissipation requirements of the planetary gear and the clutch, and ensures that the gear meshing surfaces, bearings, synchronizing elements, oil guide parts and other places that need lubrication can be lubricated, and the lubrication circulation is good.

[0018] On the other hand, an embodiment of the present invention further provides a power coupling device, which includes the above-mentioned cooling and lubrication structure for the power coupling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a cooling and lubrication structure for a power coupling device provided by an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of a cooling and lubrication structure for a power coupling device provided by one embodiment of the present invention;

[0021] Figure 3 yes Figure 2 A partial view of

[0022] Figure 4 is an exploded view of a cooling and lubrication structure for a power coupling device provided by one embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a shaft sleeve of a cooling and lubricating structure for a power coupling device provided by an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a pin shaft of a cooling and lubricating structure for a power coupling device provided by one embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of a gear ring of a cooling and lubrication structure for a power coupling device provided in one embodiment of the present invention.

[0026] The reference numerals in the drawings of the specification are as follows:

[0027] 1. Input shaft; 11. Input shaft oil passage; 12. First oil hole; 13. Second oil hole;

[0028] 2. Planetary gear; 21. Sun gear; 22. Planetary gear; 23. Planetary carrier; 231. Planetary carrier oil passage; 24. Ring gear; 241. Disc portion; 242. Ring gear portion; 243. Ring gear radial hole; 25. Pin shaft; 251. Pin shaft oil passage; 252. Pin shaft oil inlet hole; 253. Pin shaft oil outlet hole; 254. Pin shaft outer annular groove; 26. Planetary gear bearing;

[0029] 3. Clutch; 31. Synchronous element; 32. Hub;

[0030] 4. Shaft sleeve; 41. Shaft sleeve oil passage; 42. Shaft sleeve inner annular groove; 43. Shaft sleeve outer annular groove;

[0031] 5. Planetary carrier bearings. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] like Figures 1 to 7 As shown, one embodiment of the present invention provides a cooling and lubrication structure for a power coupling device.

[0034] like Figures 1 to 4As shown, the power coupling device includes an input shaft 1, a planetary gear 2 and a clutch 3. The planetary gear 2 includes a sun gear 21, a planetary gear 22, a planetary carrier 23 and a ring gear 24. The planetary gear 22 is meshed between the sun gear 21 and the ring gear 24. The sun gear 24 is fixed on the input shaft 1. A plurality of planetary gears 22 are usually provided (for example, three), and the plurality of planetary gears 22 are arranged around the sun gear 21 at equal intervals on the circumference.

[0035] A planet carrier bearing 5 is sleeved on the outer circumference of the planet carrier 23. The outer ring of the planet carrier bearing 5 is fixed in the housing of the power coupling device.

[0036] like Figure 3 As shown, the cooling and lubrication structure for the power coupling device includes an input shaft oil passage 11 arranged in the input shaft 1 and extending along its axial direction, a first oil hole 12 and a second oil hole 13 arranged on the outer wall of the input shaft 1 and connected to the input shaft oil passage 11, a first oil circuit connected to the first oil hole 12 at one end, and a second oil circuit connected to the second oil hole 12 at one end, the other end of the first oil circuit extends to the planetary gear 22 to cool and lubricate the planetary gear 22, and the other end of the second oil circuit extends to the synchronizing element 31 of the clutch 3 to cool and lubricate the synchronizing element 31 of the clutch 3.

[0037] The engagement or disengagement of the synchronizing element 31 of the clutch 3 can cause the ring gear 24 to be coupled to or disconnected from the housing of the power coupling device.

[0038] The planetary gear 22 is rotatably supported on the planetary carrier 23 through a pin shaft 25. A sleeve 4 is sleeved on the input shaft 1 on one axial side of the sun gear 21. The inner ring of the sleeve 4 is fixed on the input shaft 1. The outer ring of the sleeve 4 abuts against the inner wall of the planetary carrier 23. The sleeve 4 is provided with a sleeve oil passage 41. The planetary carrier 23 is provided with a planetary carrier oil passage 231. The pin shaft 25 is provided with a pin shaft oil passage 251 extending along its axial direction. The outer wall of the pin shaft 25 is provided with a pin shaft oil inlet hole 252 and a pin shaft oil outlet hole 253. The sleeve oil passage 41, the planetary carrier oil passage 231, the pin shaft oil inlet hole 252, the pin shaft oil passage and the pin shaft oil outlet hole are connected in sequence to form the first oil circuit ( Figure 3 The path indicated by arrow A in FIG.

[0039] Preferably, if Figure 3 and Figure 5As shown, the inner surface of the sleeve 4 is provided with a sleeve inner annular groove 42 which is recessed radially outward, and the outer surface of the sleeve 4 is provided with a sleeve outer annular groove 43 which is recessed radially inward at a position corresponding to the sleeve inner annular groove 42, the sleeve oil passage 41 is connected between the sleeve inner annular groove 42 and the sleeve outer annular groove 43, and the sleeve outer annular groove 43 is connected with the inner end opening of the planetary carrier oil passage 231.

[0040] The sleeve oil passage 41 may be provided with multiple (for example, 3) pieces. Due to the design of the sleeve inner annular groove 42, even if the inner end opening of the sleeve oil passage 41 is not aligned with the first oil hole 12 after assembly, the oil can enter the sleeve oil passage 41 through the sleeve inner annular groove 42. Similarly, due to the design of the sleeve outer annular groove 43, even if the outer end opening of the sleeve oil passage 41 is not aligned with the inner end opening of the planetary carrier oil passage 231 after assembly, the oil can enter the planetary carrier oil passage 231 through the sleeve outer annular groove 43. Thus, it is ensured that the oil in the input shaft oil passage 11 can pass through the sleeve oil passage 41, ensuring the smooth flow of the oil passage.

[0041] Preferably, if Figure 3 and Figure 5 As shown, the outer surface of the pin shaft 25 is provided with a pin shaft outer annular groove 254 which is recessed radially inward, the pin shaft oil inlet hole 252 is connected between the pin shaft outer annular groove 254 and the pin shaft oil passage 251, and the pin shaft outer annular groove 254 is connected with the outer end opening of the planetary carrier oil passage 231.

[0042] Due to the design of the pin shaft outer annular groove 254, even if the pin shaft oil inlet hole 252 is not aligned with the outer end opening of the planetary carrier oil passage 231 after assembly, the oil can enter the pin shaft oil inlet hole 252 through the pin shaft outer annular groove 254. Thus, it is ensured that the oil in the planetary carrier oil passage 231 can enter the pin shaft oil passage 251 through the pin shaft oil inlet hole 252, ensuring the smooth flow of the oil passage.

[0043] Preferably, if Figure 3 As shown, the central axis of the sleeve oil passage 41 forms an acute angle with the central axis of the input shaft 1 (i.e., the sleeve oil passage 41 is inclined), and the sleeve oil passage 41 gradually inclines from its inner end opening to the outer end opening toward the direction close to the sun gear 21.

[0044] The inclined sleeve oil passage 41 can prevent the oil from flowing out through the passage between the sun gear 21 and the planetary gear 23 and failing to enter the pin 25 .

[0045] like Figure 3 As shown, a planetary wheel bearing 26 is provided between the planetary wheel 23 and the pin shaft 25 , and the pin shaft oil outlet hole 253 is radially opposite to the inner ring of the planetary wheel bearing 26 to cool and lubricate the planetary wheel bearing 26 and the planetary wheel 23 .

[0046] like Figure 3 and Figure 7 As shown, the ring gear 24 includes a disc portion 241 and a ring gear portion 242 connected to the axial side of the outer edge of the disc portion 241, the center of the disc portion 241 is provided with a first through hole for the input shaft 1 to pass through, the disc portion 241 and the sleeve 4 are located on both axial sides of the sun gear 21, the hub 32 of the clutch 3 is located on the axial side of the disc portion 241 away from the sun gear 21, and the center of the hub 32 of the clutch 3 is provided with a second through hole for the input shaft 1 to pass through.

[0047] The ring gear portion 32 is provided with a gear ring radial hole 243 facing the synchronizing element 31 of the clutch 3. The second oil circuit includes a first branch oil circuit ( Figure 3 The radial hole 243 of the gear ring is connected to the internal space of the gear ring 24 to form the first branch oil circuit, one end of the first branch oil circuit is connected to the second oil hole 13, and the other end of the first branch oil circuit extends to the synchronizing element 31 of the clutch 3.

[0048] The second oil circuit also includes a second branch oil circuit ( Figure 3 The gap between the disc portion 241 and the hub 32 of the clutch 3 constitutes the second branch oil path, one end of the second branch oil path is connected to the second oil hole 13, and the other end of the second branch oil path extends to the synchronization element 31 of the clutch 3.

[0049] The cooling and lubrication structure for a power coupling device according to an embodiment of the present invention has the following working principle:

[0050] The pressure oil is generated by an electric pump or a mechanical pump, and after being distributed by the hydraulic module, the oil enters the input shaft 1 from the rear end of the input shaft 1 (the end away from the planetary gear 2), and then is divided into two paths to cool the planetary gear 23 and the synchronizing element 31 of the clutch 3 respectively.

[0051] The first path is that the oil passes through the input shaft oil passage 11, the first oil hole 12 and the above-mentioned first oil path ( Figure 3 The path shown by arrow A in FIG. 2 reaches the position of the planetary row 2 that requires cooling and lubrication (planetary wheel bearing 26 and planetary wheel 23).

[0052] The second oil path has two branches. The first branch is that the oil passes through the input shaft oil passage 11, the second oil hole 13 and the first branch oil path ( Figure 3 The second branch is that the oil passes through the input shaft oil passage 11, the second oil hole 13 and the second branch oil passage ( Figure 3 The path shown by the arrow B2 in FIG. 1 ) reaches the position where the clutch 3 requires cooling and lubrication (the synchronizing element 31 of the clutch 3).

[0053] The cooling and lubrication structure for the power coupling device of the embodiment of the present invention has two cooling and lubrication paths. The first path is that the oil enters the input shaft oil passage and then passes through the first oil hole and the first oil passage to reach the planetary gear position of the planetary gear to cool and lubricate the planetary gear; the second path is that the oil enters the input shaft oil passage and then passes through the second oil hole and the second oil passage to reach the synchronizing element position of the clutch to cool the synchronizing element of the clutch. It can be seen that the cooling and lubrication structure integrates the lubrication and cooling functions of the planetary gear and the clutch, forming a highly integrated cooling and lubrication structure, which can reduce the spatial size of the system and reduce the weight of the system.

[0054] This cooling and lubrication structure ensures that the planetary gear and the clutch can be forced to cool with oil under various driving conditions of the vehicle, meets the heat dissipation requirements of the planetary gear and the clutch, and ensures that the gear meshing surfaces, bearings, synchronizing elements, oil guide parts and other places that need lubrication can be lubricated, and the lubrication circulation is good.

[0055] On the other hand, an embodiment of the present invention further provides a power coupling device, which includes the cooling and lubrication structure for the power coupling device of the above embodiment.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling and lubricating structure for a power coupling device, the power coupling device comprising an input shaft, a planetary gear and a clutch, the planetary gear comprising a sun gear, a planetary gear, a planetary carrier and a ring gear, the planetary gear meshing between the sun gear and the ring gear, the sun gear being fixed on the input shaft, characterized in that: The cooling and lubricating structure for the power coupling device comprises an input shaft oil passage arranged in the input shaft and extending along the axial direction thereof, a first oil hole and a second oil hole arranged on the outer wall of the input shaft and communicating with the input shaft oil passage, a first oil circuit communicating with the first oil hole at one end and a second oil circuit communicating with the second oil hole at one end, the other end of the first oil circuit extending to the planetary gear to cool and lubricate the planetary gear, the other end of the second oil circuit extending to the synchronizing element of the clutch to cool and lubricate the synchronizing element of the clutch; the planetary gear is provided with a plurality of; The planetary gear is rotatably supported on the planetary carrier by a pin shaft, a sleeve is sleeved on the input shaft on one axial side of the sun gear, the inner ring of the sleeve is fixed on the input shaft, the outer ring of the sleeve abuts against the inner wall of the planetary carrier, the sleeve is provided with a sleeve oil passage, the planetary carrier is provided with a planetary carrier oil passage, the pin shaft is provided with a pin shaft oil passage extending along its axial direction, the outer wall of the pin shaft is provided with a pin shaft oil inlet hole and a pin shaft oil outlet hole, the sleeve oil passage, the planetary carrier oil passage, the pin shaft oil inlet hole, the pin shaft oil passage and the pin shaft oil outlet hole are connected in sequence to form the first oil circuit.

2. The cooling and lubrication structure for a power coupling device according to claim 1, characterized in that: The inner surface of the sleeve is provided with an inner annular groove of the sleeve which is recessed radially outward, and the outer surface of the sleeve is provided with an outer annular groove of the sleeve which is recessed radially inward at a position corresponding to the inner annular groove of the sleeve. The sleeve oil passage is connected between the inner annular groove of the sleeve and the outer annular groove of the sleeve, and the outer annular groove of the sleeve is connected with the inner end opening of the planetary carrier oil passage.

3. The cooling and lubrication structure for a power coupling device according to claim 1, characterized in that: The outer surface of the pin shaft is provided with a pin shaft outer annular groove which is recessed radially inwards, the pin shaft oil inlet hole is connected between the pin shaft outer annular groove and the pin shaft oil passage, and the pin shaft outer annular groove is connected with the outer end opening of the planetary carrier oil passage.

4. The cooling and lubrication structure for a power coupling device according to claim 1, characterized in that: The included angle between the central axis of the sleeve oil passage and the central axis of the input shaft is an acute angle, and the sleeve oil passage gradually inclines toward the direction approaching the sun gear from its inner end opening to its outer end opening.

5. The cooling and lubrication structure for a power coupling device according to claim 1, characterized in that: A planetary wheel bearing is arranged between the planetary wheel and the pin shaft, and the oil outlet hole of the pin shaft is radially opposite to the inner ring of the planetary wheel bearing to cool and lubricate the planetary wheel bearing and the planetary wheel.

6. The cooling and lubrication structure for a power coupling device according to claim 1, characterized in that: The ring gear includes a disc portion and a ring gear portion connected to one axial side of the outer edge of the disc portion, a first through hole for the input shaft to pass through is provided at the center of the disc portion, the disc portion and the sleeve are located on both axial sides of the sun gear, the hub of the clutch is located on the axial side of the disc portion away from the sun gear, and a second through hole for the input shaft to pass through is provided at the center of the clutch hub.

7. The cooling and lubricating structure for a power coupling device according to claim 6, characterized in that: The ring tooth portion is provided with a gear ring radial hole facing the synchronous element of the clutch, the second oil circuit includes a first branch oil circuit, the gear ring radial hole is connected to the internal space of the gear ring to form the first branch oil circuit, one end of the first branch oil circuit is connected to the second oil hole, and the other end of the first branch oil circuit extends to the synchronous element of the clutch.

8. The cooling and lubrication structure for a power coupling device according to claim 6 or 7, characterized in that: The second oil circuit includes a second branch oil circuit, the gap between the disc portion and the hub of the clutch constitutes the second branch oil circuit, one end of the second branch oil circuit is connected to the second oil hole, and the other end of the second branch oil circuit extends to the synchronizing element of the clutch.

9. A power coupling device, characterized in that: The cooling and lubrication structure for a power coupling device comprises the cooling and lubrication structure for a power coupling device according to any one of claims 1 to 8.

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