Powertrain and electric vehicle

Abstract

This application provides a powertrain and an electric vehicle, relating to the field of powertrains, to solve the problem of difficult assembly of oil baffles. A first receiving groove is used to accommodate a first set of planetary gears, and a second receiving groove is used to accommodate a second set of planetary gears. The openings of the first and second receiving grooves are axially connected and their openings face opposite directions. A first housing and a second housing are detachably enclosed axially. The oil baffle is fixed axially in the first housing. The inner diameter of the first receiving groove is smaller than the inner diameter of the second receiving groove. The second receiving groove is used to receive oil flowing out of the first receiving groove. Oil baffles are arranged radially at intervals between the groove wall of the second receiving groove and the second set of planetary gears, and the oil baffles are used to prevent the oil in the second receiving groove from being agitated during the rotation of the second set of planetary gears. By using a separate design for the first and second housings, the oil baffles are axially fixed to the first housing before the first and second housings are closed, thereby simplifying the assembly and fixing of the oil baffles.

Description

Technical Field

[0001] This application relates to the field of powertrains, and more particularly to a powertrain and an electric vehicle. Background Technology

[0002] Planetary reducers in powertrains require lubrication, but the agitation of the lubricating oil by the planetary reducer can reduce transmission efficiency and affect powertrain performance. However, the limited space within the powertrain housing makes it difficult to assemble an oil baffle structure. Summary of the Invention

[0003] This application provides a powertrain and electric vehicle to simplify the assembly and fixing of oil baffles.

[0004] To achieve the above objectives, this application adopts the following technical solution: A first aspect of this application provides a powertrain, the housing of which houses a drive motor and a planetary reducer. The planetary reducer includes a planet carrier, a first set of planetary gears, and a second set of planetary gears. The planet carrier supports and drives the first and second sets of planetary gears. The second set of planetary gears receives power output from the drive motor, and the first set of planetary gears drives the wheels of an electric vehicle. The powertrain housing includes a first housing and a second housing. The first housing includes a first receiving groove, and the second housing includes a second receiving groove. The first receiving groove accommodates the first set of planetary gears, and the second receiving groove accommodates the second set of planetary gears.

[0005] The opening of the first receiving groove faces opposite directions to the opening of the second receiving groove. The first housing and the second housing are detachably enclosed along the axial direction of the drive motor. The first housing is used to fix the oil baffle along the axial direction of the drive motor. The openings of the first receiving groove and the second receiving groove are connected along the axial direction of the drive motor. The inner diameter of the first receiving groove is smaller than the inner diameter of the second receiving groove. The second receiving groove is used to receive the oil flowing out of the first receiving groove. The oil baffles are arranged radially between the groove wall of the second receiving groove and the second set of planetary gears. The oil baffles are used to prevent the oil in the second receiving groove from being agitated during the rotation of the second set of planetary gears.

[0006] In the powertrain disclosed in this application, a split housing design with oppositely oriented and axially connected slots allows the first and second housings to be axially enclosed for assembly. A stepped structure is formed by the difference in inner diameter between the first and second receiving slots, allowing oil in the first receiving slot to flow to the second receiving slot under gravity. This eliminates the need for an additional lubrication path between the first and second receiving slots, simplifying the oil passage structure within the housing and reducing the cost of the powertrain.

[0007] The first and second housings are designed separately, and the oil baffle is axially fixed to the first housing. During assembly, the oil baffle can be independently assembled to the first housing before the gearbox is closed, without having to be installed together with the planetary reducer in the narrow housing space, thus simplifying the assembly and fixing of the oil baffle.

[0008] In one embodiment, the outer envelope of the first set of planetary gears is smaller than that of the second set of planetary gears, and the second receiving groove is used to receive oil baffles. The oil baffles are arranged radially between the groove wall of the second receiving groove and the second set of planetary gears along the drive motor.

[0009] In the powertrain provided in this application, during assembly, the first set of planetary gears and the second set of planetary gears are respectively matched and installed into their corresponding receiving slots, eliminating the need for additional centering and position adjustments, thus simplifying the assembly process and reducing assembly difficulty.

[0010] The space between the second receiving tank wall and the second set of planetary gears is reused to arrange oil baffles, which is suitable for the compact layout design of the housing and facilitates the overall vehicle layout. The oil baffles are spaced apart between the second receiving tank wall and the second set of planetary gears. This avoids interference with the second set of planetary gears and allows oil to flow between the oil baffles and the second receiving tank wall, ensuring smooth oil flow.

[0011] In one embodiment, the opening of the first receiving groove is smaller than the opening of the second receiving groove. The groove wall of the first receiving groove protrudes radially from the groove wall of the second receiving groove to form a stepped surface. The stepped surface is used to fix the oil baffle along the axial direction of the drive motor so that the oil baffle and the groove wall of the second receiving groove are arranged at a distance from each other radially from the drive motor.

[0012] In the powertrain disclosed in this application, the stepped surface formed between the wall of the first receiving tank and the wall of the second receiving tank creates a radial height difference between them, ensuring that oil flows from the first receiving tank to the second receiving tank under gravity without the need for additional flow guiding structures. Furthermore, it allows oil to flow between the oil baffle and the walls of the second receiving tank, ensuring smooth oil flow.

[0013] In one embodiment, a gap is formed between the oil baffle and the stepped surface. The gap is used to guide the oil in the first receiving tank into the second receiving tank. On the one hand, this ensures that the oil in the first receiving tank flows smoothly into the second receiving tank, and on the other hand, it prevents the oil in the first receiving tank from being sprayed directly onto the second set of planetary gears.

[0014] In one embodiment, the first housing includes an axial protrusion, which is located on a stepped surface. The axial protrusion is used to support the oil baffle and the stepped surface, which are spaced apart along the axial direction of the drive motor. The fixing member of the oil baffle is used to embed into the axial protrusion along the axial direction of the drive motor.

[0015] In the powertrain provided in this application, an oil baffle is supported by an axial protrusion to axially separate the oil baffle from the stepped surface, so as to prevent the oil baffle from interfering with the oil flow on the stepped surface.

[0016] In one embodiment, the axial protrusion protrudes from the opening of the first receiving groove along the axial direction of the drive motor, and the axial protrusion extends into the second receiving groove along the axial direction of the drive motor. The axial protrusion and the groove wall of the second receiving groove are arranged at intervals along the radial direction of the drive motor. The axial protrusion is used to support the oil baffle and the groove wall of the second receiving groove are arranged at intervals along the radial direction of the drive motor.

[0017] In the drive motor disclosed in this application, the axial protrusion extends axially beyond the opening of the first receiving groove. Therefore, there is an axial gap between the oil baffle and the opening of the first receiving groove, preventing the oil baffle from interfering with the oil flow out of the first receiving groove and ensuring that the oil in the first receiving groove flows smoothly to the second receiving groove. The axial protrusions are arranged at intervals along the radial direction of the drive motor and the groove wall of the second receiving groove. This ensures, on the one hand, that the oil flows between the axial protrusions and the groove wall of the second receiving groove, preventing interference with oil flow due to the added axial protrusions. On the other hand, it ensures that there is sufficient gap between the oil baffle and the groove wall of the second receiving groove, preventing the oil baffle from interfering with oil flow.

[0018] In one embodiment, the planetary reducer includes a gear ring, the inner circumferential surface of which is used to mesh with a first set of planetary gears, a first receiving groove including a gear ring receiving groove for fixing the gear ring, and a first housing including a first internal flow channel.

[0019] The first internal flow channel has one end opening located between the bottom of the gear ring mounting groove and the first receiving groove, and the other end opening located on the stepped surface. The axial protrusion is used to support the oil baffle to avoid the other end opening of the first internal flow channel.

[0020] In the powertrain disclosed in this application, oil in the first receiving tank enters the first internal flow channel through one end opening and flows to the stepped surface from the other end opening, and then flows from the stepped surface to the second receiving tank. An axial protrusion supports the oil baffle to avoid obstructing the other end opening of the first internal flow channel, thus preventing the oil baffle from blocking the other end opening and affecting the flow of oil in the second internal flow channel to the stepped surface, and preventing oil accumulation in the first receiving tank.

[0021] In one embodiment, the first housing includes a second internal flow channel. One end opening of the second internal flow channel is distributed on the outer wall of the first housing, and the other end opening of the second internal flow channel is distributed on the stepped surface. An axial protrusion is used to support the oil baffle to avoid the other end opening of the first internal flow channel, preventing the oil baffle from blocking the other end opening of the second internal flow channel, ensuring smooth flow of oil from the second receiving tank to the second internal flow channel, and preventing oil from accumulating in the second receiving tank.

[0022] In one embodiment, the stepped surface includes two axial protrusions, the other end opening of the first internal flow channel and the other end opening of the second internal flow channel are spaced apart between the two axial protrusions, and the two axial protrusions protrude from the groove along the axial direction of the drive motor.

[0023] In the powertrain provided in this application, by distributing the other end openings of the first internal flow channel and the other end openings of the second internal flow channel at intervals between two axial protrusions, the oil baffles supported by the axial protrusions are prevented from blocking the other end openings of the first and second internal flow channels, thus ensuring smooth oil flow.

[0024] In one embodiment, the stepped surface includes a groove, the recessed direction of which is opposite to the opening of the first receiving groove along the axial direction of the drive motor, the other end of the first internal flow channel is open, the other end of the second internal flow channel is open, and two axial protrusions are distributed in the groove.

[0025] In the powertrain provided in this application, the bottom of the reused groove is provided with the opening at the other end of the first internal flow channel, the other end of the second internal flow channel, and two axial protrusions, which helps to shorten the oil flow path. The axial protrusions are arranged by utilizing the recessed depth of the groove, without occupying additional axial space, making the internal components of the housing more compact.

[0026] In one embodiment, the second housing includes a third receiving groove, which is axially connected to the second receiving groove along the drive motor. The third receiving groove is used to receive the stator and rotor of the drive motor. The inner diameter of the third receiving groove is smaller than the inner diameter of the second receiving groove. The inner wall of the third receiving groove protrudes relative to the inner wall of the second receiving groove to form a stepped surface, and the second receiving groove is used to receive oil flowing out of the third receiving groove.

[0027] In the powertrain disclosed in this application, the inner wall of the third receiving groove protrudes relative to the inner wall of the second receiving groove, forming a stepped surface, so that the groove walls of the third and second receiving grooves together constitute a stepped groove. Utilizing the radial height difference of the stepped groove, oil flows from the third receiving groove to the second receiving groove under gravity, eliminating the need for additional guide structures, thus simplifying the oil circuit and housing structures and helping to reduce the cost of the powertrain. The gap between the second set of planetary gears and the groove walls of the second receiving groove is reused to collect the cooling oil of the drive motor without increasing the housing size, making it suitable for a compact powertrain layout design.

[0028] In one embodiment, the oil baffle includes a first part, a second part, and a third part. The first part and the second part are respectively arranged on both sides of the second set of planetary gears along the axial direction of the drive motor, and the third part is arranged radially between the groove wall of the second receiving groove and the second set of planetary gears. The oil baffle includes a plurality of through holes, and the plurality of through holes penetrate at least one of the first part, the second part, and the third part.

[0029] In the powertrain provided in this application, the arrangement of the first, second, and third parts reduces the axial space occupied by the oil baffle while achieving full coverage of the second set of planetary gears. Since the first, second, and third parts are all arranged at intervals from the second set of planetary gears, multiple through holes allow the oil inside the oil baffle to be quickly discharged through multiple through holes, preventing oil from accumulating inside the oil baffle.

[0030] In one embodiment, the oil baffle includes two fixed protrusions distributed on one side of the third portion facing the second receiving groove. The fixed protrusions are used to accommodate a fixing bolt, which is used to pass through the fixed protrusion and embed into the first housing.

[0031] In the powertrain disclosed in this application, the oil baffle is fixed by reusing the space between the second set of planetary gears and the second receiving groove, without increasing the axial and radial length of the housing, which is beneficial for adapting to the compact layout design of the powertrain. Furthermore, the connection method of fixing bolts and fixing protrusions simplifies the assembly and fixing of the oil baffle.

[0032] In one embodiment, the third part is an arc-shaped structure, with two fixed protrusions distributed on both sides of the axis of symmetry of the arc-shaped structure.

[0033] In the powertrain provided in this application, the oil baffle is fixed by two fixed protrusions. On the one hand, this reduces the number of fixing bolts used to fix the oil baffle, thereby simplifying the assembly of the oil baffle on the first housing. On the other hand, it prevents the flow of oil between the first and second receiving grooves from being affected by fixing the oil baffle on the first housing.

[0034] A second aspect of this application provides an electric vehicle including wheels and the aforementioned powertrain for driving the wheels.

[0035] The powertrain drives the wheels to rotate, and the interaction between the wheels and the road surface propels the electric vehicle. Furthermore, the electric vehicle provided in this application includes the aforementioned powertrain; therefore, the electric vehicle provided in this application solves the same technical problem and achieves the same technical effect as the powertrain in the aforementioned technical solutions, and will not be elaborated further here. Attached Figure Description

[0036] Figure 1 A schematic diagram of an electric vehicle provided for an embodiment of this application; Figure 2 A schematic diagram of a powertrain provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a powertrain provided in an embodiment of this application; Figure 4 for Figure 3 A partial exploded view of the powertrain. Figure 5 A partial cross-sectional view of a housing in a powertrain provided for the implementation of this application; Figure 6 A partial structural schematic diagram of a powertrain provided in an embodiment of this application; Figure 7 For along Figure 6 A cross-sectional view of the QQ line; Figure 8 This is one of the structural schematic diagrams of an oil baffle provided in an embodiment of this application; Figure 9 This is a second schematic diagram of an oil baffle provided in an embodiment of this application.

[0037] Figure label: 100 - Electric vehicle; 10 - Powertrain; 20 - Wheel; 201 - Front wheel; 202 - Rear wheel; 1-Drive motor; 2-Planetary reducer; 21-Planet carrier; 22-First set of planetary gears; 221-First planetary gear; 23-Second set of planetary gears; 231-Second planetary gear; 25-Sun gear; 26-Ring gear; 3-Differential; 4-Housing shell; 41-First housing shell; 411-First receiving groove; 4111-Gear ring receiving groove; 42-Second housing shell; 421-Second receiving groove; 422-Third receiving groove; 43-Middle partition plate; 44-First stepped surface; 45-Second stepped surface; 46-Axial protrusion; 47-First internal oil passage; 48-Second internal oil passage; 49-Groove; 5-Oil baffle; 51-Fixing protrusion; 511-Fixing hole; 52-Fixing component; 521-Fixing bolt; 53-First part; 54-Second part; 5-Third part; 56-Through hole; 57-Recessed area. Detailed Implementation

[0038] In current powertrains, an oil baffle is added to the axial side of the planetary gears in the planetary reducer to reduce the contact between the planetary gears and the oil, thereby reducing churning losses. However, the limited space within the powertrain housing and the fact that the oil baffle structure needs to be assembled together with the planetary reducer make the assembly of the oil baffle structure difficult.

[0039] This application provides a powertrain and electric vehicle to simplify the assembly and fixing of oil baffles.

[0040] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. Figure 1This is a schematic diagram of an electric vehicle provided as an embodiment of this application. (Refer to...) Figure 1 The electric vehicle 100 includes wheels 20 and a powertrain 10, which drives the wheels 20 to rotate. The interaction between the wheels 20 and the road surface drives the electric vehicle 100 to move.

[0041] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application. (Refer to...) Figure 2 The powertrain 10 includes a housing 4, which houses the drive motor 1, the planetary reducer 2, and the differential 3 to form a three-in-one or multi-in-one powertrain 10 with a more compact structure and higher integration.

[0042] Power is output from drive motor 1, and after passing through planetary reducer 2 to reduce speed and increase torque, it is output again. Planetary reducer 2 drives the two coaxial wheels 20 of electric vehicle 100 through differential 3.

[0043] exist Figure 2 In the given embodiment, the differential 3 is used to drive the two rear wheels 202 of the electric vehicle 100. In other embodiments, the differential 3 is used to drive the two front wheels 201 of the electric vehicle 100.

[0044] Figure 3 This is a schematic diagram of a powertrain provided in an embodiment of this application. Figure 4 for Figure 3 A partial exploded view of the powertrain. (Refer to...) Figure 2 , Figure 3 and Figure 4 The planetary reducer 2 is a two-stage planetary gear reducer, comprising a planet carrier 21, a first set of planetary gears 22, and a second set of planetary gears 23. The planet carrier 21 supports and transmits power between the first set of planetary gears 22 and the second set of planetary gears 23. The second set of planetary gears 23 receives power from the drive motor 1, while the first set of planetary gears 22 drives the wheels 20 of the electric vehicle.

[0045] Figure 3 The planetary reducer 2 in the diagram is a two-stage coaxial planetary reducer. Power is input from the second set of planetary gears 23, which achieve the first stage of reduction. The planet carrier 21 serves as a support for the first set of planetary gears 22 and the second set of planetary gears 23, and also acts as an intermediate link in power transmission, coupling the motion of the second set of planetary gears 23 to the first set of planetary gears 22. The power output from the second set of planetary gears 23 is transmitted to the first set of planetary gears 22 via the planet carrier 21, where the first set of planetary gears 22 achieves the second stage of reduction. The first set of planetary gears 22 is used to output the reduced-speed, torque-increased power to... Figure 2 Differential 3 in the middle, distributed by differential 3 to Figure 2 The two front wheels 201 or the two rear wheels 202.

[0046] Reference Figure 4 The first set of planetary gears 22 includes multiple first planetary gears 221, which are distributed circumferentially around the inner circumference of the gear ring of the planetary reducer 2. The second set of planetary gears 23 includes multiple second planetary gears 231, which are distributed circumferentially around the outer circumference of the sun gear of the planetary reducer 2.

[0047] exist Figure 4 In the diagram, direction A represents the axial direction of the drive motor. Direction B represents the radial direction of the drive motor. Direction C represents the circumferential direction of the drive motor. Hereinafter, this application will use direction A to refer to the axial direction of the drive motor, direction B to refer to the radial direction of the drive motor, and direction C to refer to the circumferential direction of the drive motor.

[0048] Reference Figure 3 and Figure 4 The powertrain 10 housing 4 includes a first housing 41 and a second housing 42. The first housing 41 includes a first receiving groove 411, the opening of which is as follows: Figure 4 As indicated by a in the middle. The second housing 42 includes a second receiving groove 421, the opening of which is as follows: Figure 4 As indicated by b. The opening of the first receiving groove 411 faces the opposite direction to the opening of the second receiving groove 421.

[0049] The first housing 41 and the second housing 42 are detachably enclosed along direction A, and the opening of the first receiving groove 411 and the opening of the second receiving groove 421 are connected along direction A. Through the design of the split housing with the openings facing opposite directions and axially connected, the first housing 41 and the second housing 42 are axially enclosed to achieve a closed box.

[0050] Figure 5 A partial sectional view of a housing in a powertrain provided for implementation of this application. (Refer to...) Figure 4 and Figure 5 The inner diameter of the first receiving tank 411 is smaller than the inner diameter of the second receiving tank 421. The second receiving tank 421 is used to receive the oil flowing out of the first receiving tank 411.

[0051] By utilizing the difference in inner diameter to form a stepped structure, the oil in the first receiving groove 411 flows to the second receiving groove 421 under the action of gravity, without the need to design an additional lubrication oil passage between the first receiving groove 411 and the second receiving groove 421, thereby simplifying the oil passage structure in the housing 4 and helping to reduce the cost of the powertrain 10.

[0052] Figure 6 This is a partial structural schematic diagram of a powertrain provided in an embodiment of this application. Figure 7 For along Figure 6 A cross-sectional view of the QQ line. (Refer to...) Figure 6and Figure 7 The first housing 41 is used to fix the oil baffle 5 along direction A. The oil baffle 5 is arranged at intervals along direction B between the groove wall of the second receiving groove 421 and the second set of planetary gears 23. The oil baffle 5 is used to prevent the oil in the second receiving groove 421 from being agitated during the rotation of the second set of planetary gears 23. The radial direction of the drive motor 1 is as follows: Figure 5 The direction pointed to by B in the text.

[0053] The first housing 41 and the second housing 42 are designed separately, and the oil baffle 5 is axially fixed to the first housing 41. During assembly, the oil baffle 5 can be independently assembled to the first housing 41 before the gearbox is closed, without having to be installed together with the planetary reducer 2 in the narrow space of the housing 4, thus simplifying the assembly and fixing of the oil baffle 5.

[0054] The oil baffles 5 are arranged radially between the wall of the second receiving groove 421 and the second set of planetary gears 23 along the drive motor 1. On the one hand, the oil baffles 5 prevent the rotation of the second set of planetary gears 23 from being interfered with. On the other hand, the oil baffles 5 are radially separated from the wall of the second receiving groove 421, allowing the oil to flow between the oil baffles 5 and the wall of the second receiving groove 421, ensuring smooth oil flow.

[0055] In some embodiments, refer to Figure 6 and Figure 7 The outer envelope of the second set of planetary gears 23 is larger than the outer envelope of the first set of planetary gears 22. The outer envelope of the first set of planetary gears 22 refers to the maximum circumferential diameter swept by the outer edge of the first set of planetary gears 22 as it rotates with the planet carrier 21. The outer envelope of the second set of planetary gears 23 refers to the maximum circumferential diameter swept by the outer edge of the second set of planetary gears 23 as it rotates with the planet carrier 21.

[0056] By adapting the inner diameter of the first receiving groove 411 to the outer envelope of the first set of planetary gears 22, and the inner diameter of the second receiving groove 421 to the outer envelope of the second set of planetary gears 23, the first set of planetary gears 22 and the second set of planetary gears 23 are matched and installed into their respective receiving grooves during assembly. This eliminates the need for additional alignment and position adjustments, simplifying the assembly process and reducing assembly difficulty.

[0057] Reference Figure 6 and Figure 7 The second receiving groove 421 is used to accommodate the oil baffles 5, which are spaced apart along direction B between the groove wall of the second receiving groove 421 and the second set of planetary gears 23. The oil baffles 5 are arranged by reusing the space between the groove wall of the second receiving groove 421 and the second set of planetary gears 23 to adapt to the compact layout design of the housing 4, which is beneficial to the overall vehicle layout.

[0058] The oil baffles 5 are spaced apart between the wall of the second receiving groove 421 and the second set of planetary gears 23. On the one hand, this avoids interfering with the rotation of the second set of planetary gears 23, and on the other hand, it radially separates the oil baffles 5 from the wall of the second receiving groove 421, allowing the oil to flow between the oil baffles 5 and the wall of the second receiving groove 421, thus ensuring smooth oil flow.

[0059] In some embodiments, refer to Figure 5 and Figure 6 The opening of the first receiving groove 411 is smaller than the opening of the second receiving groove 421. The wall of the first receiving groove 411 protrudes along direction B relative to the wall of the second receiving groove 421 to form a stepped surface. This stepped surface is as follows: Figure 5 The first step surface 44 refers to the step surface formed between the wall of the first receiving groove 411 and the wall of the second receiving groove 421. For ease of distinction, the step surface formed between the wall of the first receiving groove 411 and the wall of the second receiving groove 421 is referred to as the first step surface 44.

[0060] The stepped surface formed by the wall of the first receiving tank 411 relative to the wall of the second receiving tank 421 creates a radial height difference between the first receiving tank 411 and the second receiving tank 421, ensuring that the oil flows from the first receiving tank 411 to the second receiving tank 421 under the action of gravity, without the need for additional flow guiding structures.

[0061] Reference Figure 5 and Figure 6 The first step surface 44 is used to fix the oil baffle 5 along the A direction so that the oil baffle 5 and the groove wall of the second receiving groove 421 are arranged at a radial distance along the drive motor 1, so as to prevent the oil baffle 5 from interfering with the oil flow between the first receiving groove 411 and the second receiving groove 421, and allow the oil to flow through the gap between the oil baffle 5 and the groove wall of the second receiving groove 421, so as to ensure smooth oil flow.

[0062] In some embodiments, refer to Figure 6 A gap is formed between the oil baffle 5 and the stepped surface. The gap is used to guide the oil in the first receiving tank 411 into the second receiving tank 421. On the one hand, it ensures that the oil in the first receiving tank 411 flows smoothly into the second receiving tank 421. On the other hand, it prevents the oil in the first receiving tank 411 from being sprayed directly onto the second set of planetary gears 23.

[0063] In one implementation, refer to Figure 5 and Figure 6 The first housing 41 includes an axial protrusion 46, which is located on the first stepped surface 44. The axial protrusion 46 supports the oil baffle 5, which is spaced apart from the first stepped surface 44 along the A direction. The fixing member 52 of the oil baffle 5 is used to embed into the axial protrusion 46 along the A direction. The oil baffle 5 is supported by the axial protrusion 46 to axially separate the oil baffle 5 from the stepped surface, so as to prevent the oil baffle 5 from interfering with the oil flow on the stepped surface.

[0064] In some embodiments, refer to Figure 5 and Figure 6 The axial protrusion 46 protrudes from the opening of the first receiving groove 411 along direction A. The axial protrusion 46 extends into the second receiving groove 421 along the axial direction of the drive motor 1. The axial protrusion 46 and the groove wall of the second receiving groove 421 are arranged at intervals along the radial direction of the drive motor 1. The axial protrusion 46 is used to support the oil baffle 5 and the groove wall of the second receiving groove 421 are arranged at intervals along the radial direction of the drive motor 1.

[0065] The axial protrusion 46 protrudes axially from the opening of the first receiving groove 411, thus creating a gap between the oil baffle 5 and the opening of the first receiving groove 411 along direction A. This prevents the oil baffle 5 from interfering with the oil flow out of the first receiving groove 411 and ensures that the oil in the first receiving groove 411 flows smoothly to the second receiving groove 421. The axial protrusion 46 along direction B is spaced apart from the groove wall of the second receiving groove 421. This ensures that the oil flows between the axial protrusion 46 and the groove wall of the second receiving groove 421, preventing the addition of the axial protrusion 46 from interfering with the oil flow. It also ensures that there is sufficient gap between the oil baffle 5 and the groove wall of the second receiving groove 421 to prevent the oil baffle 5 from interfering with the oil flow.

[0066] Reference Figure 4 and Figure 5 The planetary reducer 2 includes a gear ring 26, the inner circumferential surface of which is used to mesh with the first set of planetary gears 22.

[0067] In one implementation, refer to Figure 5 The first receiving groove 411 includes a gear ring receiving groove 4111, which is used to fix the gear ring 26. The first housing 41 includes a first internal flow channel 47, one end of which is located between the gear ring mounting groove 4111 and the bottom of the first receiving groove 411, and the other end of which is located on the first stepped surface 44. The axial protrusion 46 is used to support the oil baffle 5 to avoid the other end opening of the first internal flow channel 47. The one end opening of the first internal flow channel 47 is as follows: Figure 5 As shown in k1. The other end of the first internal flow channel 47 opens as shown in... Figure 5 As shown in k2.

[0068] The oil in the first receiving tank 411 enters the first internal flow channel 47 through one end opening and flows to the first stepped surface 44 from the other end opening, and then flows from the first stepped surface 44 to the second receiving tank 421. The axial protrusion 46 is used to support the oil baffle 5 to avoid the other end opening of the first internal flow channel 47, so as to prevent the oil baffle 5 from blocking the other end opening of the first internal flow channel 47, which would affect the flow of oil in the second internal flow channel 47 to the stepped surface, and prevent the oil from accumulating in the first receiving tank 411.

[0069] In some embodiments, refer to Figure 5 and Figure 6 The first housing 41 includes a second internal flow channel 48. One end opening of the second internal flow channel 48 is located on the outer wall of the first housing 41, and the other end opening is located on the first stepped surface 44. One end opening of the second internal flow channel 48 is not shown in the accompanying drawings. The other end opening of the second internal flow channel 48 is as follows... Figure 5 As shown in k3.

[0070] The oil in the second receiving tank 421 is discharged from the housing 4 through the second internal flow channel 48. The axial protrusion 46 is used to support the oil baffle 5 so that the oil baffle 5 avoids the other end opening of the second internal flow channel 48, preventing the oil baffle 5 from blocking the other end opening of the second internal flow channel 48, ensuring smooth flow of oil from the second receiving tank 421 to the second internal flow channel 48, and preventing oil from accumulating in the second receiving tank 421.

[0071] In some embodiments, refer to Figure 5 and Figure 6 The first step surface 44 includes two axial protrusions 46, and the other end opening of the first internal flow channel 47 and the other end opening of the second internal flow channel 48 are spaced apart between the two axial protrusions 46.

[0072] By distributing the other end opening of the first internal flow channel 47 and the other end opening of the second internal flow channel 48 between the two axial protrusions 46, the oil baffle 5 supported by the axial protrusions 46 is prevented from blocking the other end openings of the first internal flow channel 47 and the second internal flow channel 48, thus ensuring smooth oil flow.

[0073] In some embodiments, refer to Figure 5 and Figure 6 The first stepped surface 44 includes a groove 49, the recessed direction of which is opposite to the opening of the first receiving groove 411 along direction A. The other end of the first internal flow channel 47 is open, the other end of the second internal flow channel 48 is open, and two axial protrusions 46 are distributed in the groove. The two axial protrusions protrude from the groove 49 along direction A.

[0074] The bottom of the reused groove 49 is provided with the opening at the other end of the first internal flow channel 47, the opening at the other end of the second internal flow channel 48, and two axial protrusions 46, which helps to shorten the oil flow path. The axial protrusions are arranged using the recessed depth of the groove, without occupying additional axial space, making the internal components of the housing more compact.

[0075] Figure 8 This is one of the structural schematic diagrams of an oil baffle provided in an embodiment of this application. Figure 9 This is a second schematic diagram of an oil baffle provided in an embodiment of this application. (Refer to...) Figure 8and Figure 9 The oil baffle 5 includes a first part 53, a second part 54 and a third part 5. The first part 53 and the second part 54 are arranged along direction A on both sides of the second set of planetary gears 23, and the third part 5 is arranged along the radial direction of the drive motor 1 between the groove wall of the second receiving groove 421 and the second set of planetary gears 23.

[0076] The arrangement of the first part 53, the second part 54, and the third part 5 achieves full coverage of the oil baffle 5 over the second set of planetary gears 23 while reducing the axial space occupied by the oil baffle 5. Since the first part 53, the second part 54, and the third part 5 are all arranged at intervals with the second set of planetary gears 23, the oil in the oil baffle 5 can be quickly discharged through multiple through holes 56, preventing the oil from accumulating in the oil baffle 5.

[0077] Reference Figure 7 , Figure 8 and Figure 9 The first part 53, the second part 54, and the third part 5 are all arranged at intervals with the second set of planetary gears 23 to prevent interference with the rotation of the second set of planetary gears 23. The oil baffle 5 includes multiple through holes 56, which penetrate at least one of the first part 53, the second part 54, and the third part 5. The multiple through holes 56 allow the oil in the oil baffle 5 to be quickly discharged through the multiple through holes 56, preventing the oil from accumulating in the oil baffle 5.

[0078] In some embodiments, refer to Figure 7 The projection of the oil baffle 5 along direction B is located within the projection of the planetary carrier 21. The oil baffle 5 does not occupy any additional axial space, which is conducive to adapting to the compact layout design of the powertrain.

[0079] Reference Figure 8 The third part 53 includes a through hole 56, which is as follows: Figure 8 As indicated by c1, the through hole 56 penetrates the third part 5. By designing the diameter of this through hole 56, a small amount of oil from the second receiving groove 421 is allowed to enter the oil baffle 5, achieving a micro-agitation lubrication effect. This not only reduces lubricant waste but also lowers frictional losses between the lubricant and the second set of planetary gears 23, preventing insufficient lubrication of the planetary reducer 2 due to space constraints. It also prevents the second set of planetary gears 23 from being directly immersed in the oil in the second receiving groove 421, ensuring effective agitation lubrication while reducing agitation losses, thus guaranteeing the operational reliability of the planetary reducer 2.

[0080] When the planetary reducer 2 is not rotating, the oil enters the oil baffle 5 through the through hole 56 of the first part 53, and the oil level in the oil baffle 5 is the same as the oil level in the second receiving tank 421. When the planetary reducer 2 rotates, the second set of planetary gears 23 rotates at high speed, throwing the oil against the inner wall of the oil baffle 5 or throwing it out, causing the oil level in the oil baffle 5 to drop. Since the oil level in the second receiving tank 421 is greater than the oil level in the oil baffle 5, the oil in the second receiving tank 421, under hydrostatic pressure, continuously flows into the oil baffle 5 through the through hole 56 of the third part 5, thus preventing the second set of planetary gears 23 from being completely immersed in the oil while ensuring lubrication.

[0081] exist Figure 8 In the given embodiment, the through hole 56 of the third part 5 is an elongated hole. In other embodiments, the through hole 56 of the third part 5 is a round hole or an elliptical hole. This application does not impose specific limitations on the number and shape of the through holes 56 of the third part 5.

[0082] Reference Figure 8 The second part 54 includes a through hole 56, which is as follows: Figure 8 As indicated by c2. The through hole 56 extends through the second part 54 along direction A. By designing the radial height of the through hole 56 on the second part 54, the oil in the oil baffle 5 can be quickly discharged through the through hole 56 of the second part 54, preventing the oil from accumulating in the oil baffle 5.

[0083] In other embodiments of this application, at least one of the first portion 53, the second portion 54, and the third portion 5 has a plurality of through holes 56, and the number of through holes 56 in the first portion 53, the second portion 54, and the third portion 5 may be the same or different. This application does not impose any special limitations on this, and those skilled in the art can selectively design according to actual needs.

[0084] In some embodiments, refer to Figure 6 and Figure 7 The first part 53 and the second part 54 include a recessed region 57 on the side facing the planet carrier 21. The recessed region 57 is recessed in a radial direction away from the planet carrier 21 to prevent interference with the planet carrier 21.

[0085] In some embodiments, refer to Figure 6 , Figure 7 and Figure 8 The oil baffle 5 includes two fixed protrusions 51, which are distributed on the side of the third part 5 facing the second receiving groove 421. The fixed protrusions 51 are used to receive the fixing bolts 521, and the fixing bolts 521 are used to pass through the fixing holes 511 of the fixed protrusions 51 and be embedded into the first housing 41.

[0086] Fixing holes 511 are distributed on fixing protrusions 51, and fixing bolts 521 are used to pass through the fixing holes 511 of fixing protrusions 51 and embed into the first stepped surface 44 of the first housing 41. By reusing the space between the second set of planetary gears 23 and the second receiving groove 421 to place and fix the oil baffle 5, the axial and radial lengths of the housing 4 are not increased, which is beneficial for adapting to the compact layout design of the powertrain 10. Furthermore, the connection method of fixing bolts 521 and fixing protrusions 51 simplifies the assembly and fixing of the oil baffle 5.

[0087] In some embodiments, refer to Figure 8 The third part, 5, is an arc-shaped structure, with two fixed protrusions 51 distributed on both sides of the axis of symmetry of the arc-shaped structure. The axis of symmetry of the arc-shaped structure is as follows: Figure 8 The 'd' refers to.

[0088] The oil baffle 5 is fixed by two fixed protrusions 51. On the one hand, this reduces the number of fixing bolts used to fix the oil baffle 5, thus simplifying the assembly of the oil baffle 5 on the first housing 41. On the other hand, it prevents the flow of oil between the first receiving groove 411 and the second receiving groove 421 from being affected by fixing the oil baffle 5 on the first housing 41.

[0089] In some embodiments, refer to Figure 4 The second housing 42 includes a third receiving groove 422, which is connected to the second receiving groove 421 along direction A. The third receiving groove 422 is used to receive the stator and rotor of the drive motor 1. The stator and rotor of the drive motor 1 are not shown in the accompanying drawings of this application.

[0090] The inner diameter of the third receiving groove 422 is smaller than the inner diameter of the second receiving groove 421, and the inner wall of the third receiving groove 422 protrudes relative to the inner wall of the second receiving groove 421 to form a stepped surface. Figure 4 The second step surface 45 refers to the step surface formed between the inner wall of the third receiving tank 422 and the inner wall of the second receiving tank 421. For ease of distinction, the second step surface 45 is referred to below. The second receiving tank 421 is used to receive the oil flowing out of the third receiving tank 422.

[0091] The inner wall of the third receiving groove 422 protrudes relative to the inner wall of the second receiving groove 421, forming a stepped surface, so that the groove walls of the third receiving groove 422 and the second receiving groove 421 together constitute a stepped groove. Utilizing the radial height difference of the stepped groove, oil flows from the third receiving groove 422 to the second receiving groove 421 under gravity, eliminating the need for additional flow guiding structures. This simplifies the oil circuit structure and the housing 4 structure, and helps reduce the cost of the powertrain 10. The gap between the second set of planetary gears 23 and the groove wall of the second receiving groove 421 is reused to collect the cooling oil of the drive motor 1 without increasing the size of the housing 4, thus fitting the compact layout design of the powertrain 10.

[0092] The oil baffle 5 prevents the second set of planetary gears 23 from agitating the oil in the second receiving tank 421, thereby improving the transmission efficiency of the planetary reducer 2. The stepped groove design of the second housing 42 enables the oil circuit design and space reuse of the housing 4, and the oil baffle 5 reduces the oil agitation loss of the planetary reducer 2, so that the powertrain 10 can achieve both structural simplification and improved transmission efficiency in a compact layout.

[0093] In some embodiments, refer to Figure 4 The second receiving groove 421 is also used to receive a middle partition 43, the outer diameter of which is smaller than the inner diameter of the second receiving groove 421 but larger than the inner diameter of the third receiving groove 422. The middle partition 43 is used to enclose the third receiving groove 422. The second stepped surface 45 formed by the groove wall of the third receiving groove 422 and the groove wall of the second receiving groove 421 is used to fix the middle partition 43.

[0094] In some embodiments, the second housing 42 includes an oil passage for connecting the second receiving tank 421 and the third receiving tank 422. One end of the oil passage is located at the bottom of the third receiving tank 422, and the other end is located at the second stepped surface 45. The second stepped surface 45, in addition to satisfying the oil circuit design, is also used to fix the intermediate partition 43.

[0095] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A powertrain, characterized in that, The powertrain housing houses the drive motor and the planetary reducer. The planetary reducer includes a planet carrier, a first set of planetary gears, and a second set of planetary gears. The planet carrier supports and transmits power between the first set of planetary gears and the second set of planetary gears. The second set of planetary gears receives power output from the drive motor. The first set of planetary gears drives the wheels of the electric vehicle. The powertrain housing includes a first housing and a second housing. The first housing includes a first receiving groove, and the second housing includes a second receiving groove. The first receiving groove accommodates the first set of planetary gears, and the second receiving groove accommodates the second set of planetary gears, wherein: The opening of the first receiving groove faces opposite directions to the opening of the second receiving groove. The first housing and the second housing are detachably enclosed along the axial direction of the drive motor. The first housing is used to fix the oil baffle along the axial direction of the drive motor. The openings of the first receiving groove and the second receiving groove are connected along the axial direction of the drive motor. The inner diameter of the first receiving groove is smaller than the inner diameter of the second receiving groove. The second receiving groove is used to receive the oil flowing out of the first receiving groove. The oil baffles are arranged radially between the groove wall of the second receiving groove and the second set of planetary gears. The oil baffles are used to prevent the oil in the second receiving groove from being agitated during the rotation of the second set of planetary gears.

2. The powertrain according to claim 1, characterized in that, The outer envelope of the first set of planetary gears is smaller than that of the second set of planetary gears. The second receiving groove is used to receive the oil baffle. The oil baffle is arranged radially between the groove wall of the second receiving groove and the second set of planetary gears along the drive motor.

3. The powertrain according to any one of claims 1-2, characterized in that, The opening of the first receiving groove is smaller than the opening of the second receiving groove. The groove wall of the first receiving groove protrudes radially from the groove wall of the second receiving groove to form a stepped surface. The stepped surface is used to fix the oil baffle along the axial direction of the drive motor so that the oil baffle and the groove wall of the second receiving groove are arranged at a distance from each other radially from the drive motor.

4. The powertrain according to claim 3, characterized in that, A gap is formed between the oil baffle and the stepped surface, and the gap is used to guide the oil in the first receiving tank into the second receiving tank.

5. The powertrain according to claim 3, characterized in that, The first housing includes an axial protrusion, which is located on the stepped surface. The axial protrusion is used to support the oil baffle and the stepped surface, which are spaced apart along the axial direction of the drive motor. The fixing member of the oil baffle is used to embed into the axial protrusion along the axial direction of the drive motor.

6. The powertrain according to claim 5, characterized in that, The axial protrusion protrudes from the opening of the first receiving groove along the axial direction of the drive motor, and the axial protrusion extends into the second receiving groove along the axial direction of the drive motor. The axial protrusion and the groove wall of the second receiving groove are arranged at intervals along the radial direction of the drive motor. The axial protrusion is used to support the oil baffle and the groove wall of the second receiving groove are arranged at intervals along the radial direction of the drive motor.

7. The powertrain according to claim 3, characterized in that, The planetary reducer includes a gear ring, the inner circumferential surface of which meshes with the first set of planetary gears. The first receiving groove includes a gear ring receiving groove for fixing the gear ring. The first housing includes a first internal flow channel, wherein: One end opening of the first internal flow channel is located between the bottom of the gear ring mounting groove and the first receiving groove, and the other end opening of the first internal flow channel is located on the stepped surface. The axial protrusion is used to support the oil baffle to avoid the other end opening of the first internal flow channel.

8. The powertrain according to claim 3 or 7, characterized in that, The first housing includes a second internal flow channel. One end of the second internal flow channel is located on the outer wall of the first housing, and the other end of the second internal flow channel is located on the stepped surface. The axial protrusion is used to support the oil baffle to avoid the other end opening of the first internal flow channel.

9. The powertrain according to claim 8, characterized in that, The stepped surface includes two axial protrusions, and the other end openings of the first internal flow channel and the other end openings of the second internal flow channel are spaced apart between the two axial protrusions.

10. The powertrain according to claim 9, characterized in that, The stepped surface includes a groove, the recessed direction of which is opposite to the opening of the first receiving groove along the axial direction of the drive motor. The other end of the first internal flow channel is open, the other end of the second internal flow channel is open, and the two axial protrusions are distributed in the groove, protruding from the groove along the axial direction of the drive motor.

11. The powertrain according to any one of claims 1-10, characterized in that, The second housing includes a third receiving groove, which is connected to the second receiving groove along the axial direction of the drive motor. The third receiving groove is used to receive the stator and rotor of the drive motor. The inner diameter of the third receiving groove is smaller than the inner diameter of the second receiving groove. The groove wall of the third receiving groove protrudes relative to the groove wall of the second receiving groove to form a stepped surface. The second receiving groove is used to receive oil flowing out from the third receiving groove.

12. The powertrain according to any one of claims 1-11, characterized in that, The oil baffle includes a first part, a second part, and a third part. The first part and the second part are respectively arranged on both sides of the second set of planetary gears along the axial direction of the drive motor. The third part is arranged radially along the drive motor between the groove wall of the second receiving groove and the second set of planetary gears. The oil baffle includes a plurality of through holes, and the plurality of through holes penetrate at least one of the first part, the second part, and the third part.

13. The powertrain according to claim 12, characterized in that, The oil baffle includes two fixed protrusions distributed on the side of the third part facing the second receiving groove. The fixed protrusions are used to accommodate a fixing bolt, which is used to pass through the fixed protrusion and embed into the first housing.

14. The powertrain according to claim 13, characterized in that, The third part is an arc-shaped structure, and the two fixed protrusions are distributed on both sides of the axis of symmetry of the arc-shaped structure.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels and a powertrain according to any one of claims 1-14, the powertrain being used to drive the wheels.

Images