Gearbox integrated with an electric motor

Abstract

The utility model belongs to the transmission technical field of car, concretely relates to a gearbox integrated with motor, including first casing, second casing, third casing, motor part and transmission part. The gearbox integrated with motor of the utility model sets up motor part between first casing and third casing, sets up transmission part between third casing and second casing, third casing separates motor part and transmission part, makes motor part and transmission part be located in independent space, avoids motor part and transmission part to interfere with each other. The motor part and transmission part can be assembled from one side of the first casing, avoiding setting open, end cover and connecting piece on both sides of the whole casing, the motor part can be directly assembled into the first casing, the structure of the gearbox is simple, the occupied space can be reduced, the assembly process is simplified, and the integration degree is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive transmission technology, and in particular to a gearbox integrating an electric motor. Background Technology

[0002] Some existing new energy vehicles typically integrate the motor into the gearbox. The gearbox usually includes the motor, transmission components, a housing with openings on both sides, and end caps to cover the openings. During assembly, the motor needs to be installed from the left side of the housing (from the driver's position) and the left end cap needs to be closed; then the transmission components need to be installed from the right side of the housing and the right end cap needs to be closed.

[0003] Existing gearboxes have many components, occupy a lot of space, have complex assembly processes, and low integration. Utility Model Content

[0004] To reduce the space occupied by the gearbox and improve its integration, this utility model provides a gearbox with an integrated motor.

[0005] A gearbox integrating an electric motor according to an embodiment of the present invention includes: The first housing includes a first bottom wall, a first side wall, and a first opening; The second housing includes a second bottom wall and a second opening, wherein the first opening is engaged with the second opening; The third housing is fixedly disposed between the first housing and the second housing; The motor part includes a stator assembly, a rotor assembly, and a rotating shaft. The outer peripheral wall of the stator assembly is fixedly connected to the first side wall. The rotor assembly is rotatably disposed inside the stator assembly. The rotating shaft is fixedly connected to the rotor assembly. The first end of the rotating shaft is connected to the first bottom wall through a first bearing, and the second end of the rotating shaft is connected to the third housing through a second bearing. The transmission part includes a transmission shaft, the first end of which is rotatably connected to the rotating shaft, and the second end of which is provided with a third bearing and connected to the second bottom wall.

[0006] In some embodiments, the outer peripheral wall of the stator assembly is interference-fitted with the first sidewall.

[0007] In some embodiments, a groove is provided on the outer peripheral wall of the stator assembly, and the groove cooperates with the first sidewall to form a first oil passage, through which cooling oil is introduced to cool the stator assembly.

[0008] In some embodiments, the groove includes a plurality of interconnected first groove segments and a plurality of second groove segments. The first groove segments extend along the axial direction of the stator assembly and are uniformly distributed along the circumference of the stator assembly. The second groove segments extend along the circumference of the stator assembly and are spaced apart along the axial direction of the stator assembly. Adjacent second groove segments in the circumference of the stator assembly are staggered.

[0009] In some embodiments, the rotor assembly is sleeved on the rotating shaft, a key structure is provided between the rotor assembly and the rotating shaft, a pressure plate is provided on the first end side of the rotating shaft on the rotor assembly, and a limiting shoulder is formed on the second end side of the rotating shaft on the rotor assembly.

[0010] In some embodiments, a second oil passage is provided in the rotating shaft, and an oil slinger hole is provided on the rotating shaft corresponding to the rotor assembly, the oil slinger hole extending from the second oil passage to the outside of the rotating shaft.

[0011] In some embodiments, the first bottom wall is provided with a first mounting groove to accommodate a first bearing, and a first pull plate is provided on the second end side of the first bearing. The first pull plate is connected to the first bottom wall from the outside by a first bolt. The third housing is provided with a second mounting groove on the first end side to accommodate a second bearing. The second bottom wall is provided with a third mounting groove to accommodate the third bearing, and a second pull plate is provided on the first end side of the third bearing. The second pull plate is connected to the second bottom wall from the outside by a second bolt.

[0012] In some embodiments, the rotating shaft is provided with a first journal corresponding to the first bearing, and the first journal is provided with a first retaining ring at the first end side of the first bearing; the rotating shaft is provided with a second journal corresponding to the second bearing; the transmission shaft is provided with a third journal corresponding to the third bearing, and the third journal is provided with a second retaining ring at the second end side of the third bearing.

[0013] In some embodiments, a keyway is provided at the second end of the rotating shaft, and a spline is provided at the first end of the transmission shaft and connected to the keyway.

[0014] In some embodiments, a third oil passage is provided inside the drive shaft, with a first end of the third oil passage communicating with the second oil passage, and a second end of the third oil passage used to introduce cooling oil.

[0015] By adopting the technical solution of this utility model, the motor part is located between the first housing and the third housing, and the transmission part is located between the third housing and the second housing. The third housing separates the motor part and the transmission part, placing them in independent spaces and avoiding mutual interference. Both the motor part and the transmission part can be assembled on one side of the first housing, avoiding the need for openings, end caps, and connectors on both sides of the housing. The motor part can be directly assembled into the first housing. This gearbox has a simple structure, reduces space occupation, simplifies assembly processes, and improves integration. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of a gearbox integrating an electric motor according to one embodiment of this application; Figure 2 This is a cross-sectional structural diagram of the shell portion according to one embodiment of this application; Figure 3 This is a schematic diagram of the motor portion according to one embodiment of this application; Figure 4 This is a schematic diagram of the structure of the rotating shaft according to one embodiment of this application.

[0017] In the figure: First housing 10; First bottom wall 11; First side wall 12; First mounting groove 13; Second housing 20; Second bottom wall 21; Second side wall 22; Third mounting groove 23; Third housing 30; Second mounting groove 31; Stator assembly 40; First oil passage 41; Groove 42; First groove 43; Second groove 44; Rotor assembly 50; Rotating shaft 60; Limiting shoulder 61; First journal 62; Second journal 63; Second oil passage 64; Oil slinger hole 65; Keyway 66; Drive shaft 70; Third oil passage 71; First bearing 80; Second bearing 81; Third bearing 82; Pressure plate 90; First pull plate 91; Second pull plate 92; First retaining ring 93; Second retaining ring 94. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] The orientations or positional relationships indicated by terms such as "left," "right," "inner," "outer," "axial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figure 1 and Figure 2 As shown, this embodiment provides a gearbox integrated with a motor. The gearbox includes a first housing 10, a second housing 20, a third housing 30, a motor portion, and a transmission portion. The first housing 10 includes a first bottom wall 11, a first side wall 12, and a first opening. The second housing 20 includes a second bottom wall 21, a second side wall 22, and a second opening, wherein the first opening and the second opening are engaged. The third housing 30 is fixedly disposed between the first housing 10 and the second housing 20. It should be noted that the second housing 20 is generally sheet metal in shape. The second housing 20 can be fixedly connected to either the first housing 10 or the second housing 20 as needed. The specific shape of the second housing 20 needs to be adaptively adjusted according to the shape and layout of other components.

[0022] The motor portion of this embodiment includes a stator assembly 40, a rotor assembly 50, and a rotating shaft 60. The outer peripheral wall of the stator assembly 40 is fixedly connected to a first side wall 12. The rotor assembly 50 is rotatably disposed inside the stator assembly 40. The rotating shaft 60 is fixedly connected to the rotor assembly 50. A first bearing 80 is provided at the first end (left end) of the rotating shaft 60 and connected to a first bottom wall 11. A second bearing 81 is provided at the second end (right end) of the rotating shaft 60 and connected to a third housing 30, to meet the requirement of the rotor assembly 50 rotating relative to the stator assembly 40. The transmission portion includes a transmission shaft 70. The first end of the transmission shaft 70 is synchronously rotatably connected to the rotating shaft 60, and the second end of the transmission shaft 70 is provided with a third bearing 82 and connected to a second bottom wall 21.

[0023] In the gearbox of this embodiment, the motor is disposed between the first housing 10 and the third housing 30, and the transmission is disposed between the third housing 30 and the second housing 20. The third housing 30 separates the motor and the transmission, placing them in independent spaces and preventing interference between them. Both the motor and the transmission can be assembled on one side of the first housing 10, avoiding the need for openings, end caps, and connectors on both sides of the housing. The motor can be directly assembled into the first housing 10. This gearbox has a simple structure, reduces space occupation, simplifies assembly processes, and improves integration.

[0024] In this embodiment, the outer peripheral wall of the stator assembly 40 is preferably interference-fitted with the first side wall 12. No bolts are required to fix the stator assembly 40 to the first housing 10, effectively saving space and improving integration. See details... Figure 3 The stator assembly 40 has a groove 42 on its outer peripheral wall, which, together with the first side wall 12, forms a first oil passage 41. Cooling oil can flow into the first oil passage 41 to directly cool the stator assembly 40. By utilizing the cooling oil in the first oil passage 41 to directly exchange heat with the stator assembly 40, the heat dissipation effect of the stator assembly 40 can be guaranteed.

[0025] In this embodiment, the groove 42 preferably includes several interconnected segments of first groove 43 and several segments of second groove 44. The first grooves 43 extend axially along the stator assembly 40 and are uniformly distributed circumferentially along the stator assembly 40. The second grooves 44 extend circumferentially along the stator assembly 40 and are spaced apart axially along the stator assembly 40. Adjacent second grooves 44 in the circumferential direction of the stator assembly 40 are staggered. For example, the first segment of the first groove 43 and the second segment of the first groove 43 are connected by a first row of second grooves 44, and the second segment of the first groove 43 and the third segment of the second groove 44 are connected by a second row of second grooves 44. The second row of second grooves 44 is staggered from the first row of second grooves 44, so that the coolant can flow through different positions along the axial and circumferential directions of the stator assembly 40, ensuring the uniformity of heat dissipation of the stator assembly 40. In some embodiments, the groove 42 can be designed as other conventional mesh or tree-like structures as needed to meet the cooling requirements of the stator assembly 40.

[0026] See details Figure 1 In this embodiment, the rotor assembly 50 is sleeved on the rotating shaft 60. The rotor assembly 50 and the rotating shaft 60 can be optionally connected by a key structure to restrict the rotor assembly 50 from rotating in the circumferential direction relative to the rotating shaft 60. The rotating shaft 60 is provided with a pressure plate 90 on the first end side of the rotor assembly 50, and a limiting shoulder 61 is formed on the second end side of the rotating shaft 60. The pressure plate 90 cooperates with the limiting shoulder 61 to restrict the rotor assembly 50 from moving in the axial direction relative to the rotating shaft 60.

[0027] In this embodiment, a second oil passage 64 is provided in the rotating shaft 60, and an oil slinger hole 65 is provided on the rotating shaft 60 corresponding to the rotor assembly 50. The oil slinger hole 65 extends from the second oil passage 64 to the outside of the rotating shaft 60. Cooling oil can flow into the second oil passage 64, and the cooling oil passes through the oil slinger hole 65 to cool the rotor assembly 50. By utilizing the cooling oil in the second oil passage 64 to exchange heat with the rotor assembly 50 through the oil slinger hole 65, the heat dissipation effect of the rotor assembly 50 can be guaranteed. In this embodiment, cooling structures are provided for both the stator assembly 40 and the rotor assembly 50, so that the entire motor part has a good heat dissipation effect.

[0028] In this embodiment, the first bottom wall 11 of the first housing 10 is provided with a first mounting groove 13 to accommodate a first bearing 80. A first pull plate 91 is provided on the second end side of the first bearing 80. A first bolt passes through the first bottom wall 11 from the outside to connect the first pull plate 91. By tightening the first bolt, the first pull plate 91 can be controlled to restrict the first bearing 80 in the first mounting groove 13. The third housing 30 is provided with a second mounting groove 31 on the first end side to accommodate the second bearing 81. The second bottom wall 21 of the second housing 20 is provided with a third mounting groove 23 to accommodate a third bearing 82. A second pull plate 92 is provided on the first end side of the third bearing 82. A second bolt passes through the second bottom wall 21 from the outside to connect the second pull plate 92. By tightening the second bolt, the second pull plate 92 can be controlled to restrict the third bearing 82 in the third mounting groove 23. In this embodiment, the first pull plate 91 and the first mounting groove 13 are used to limit the first bearing 80, and the second pull plate 92 and the third mounting groove 23 are used to limit the third bearing 82, which can ensure the accurate installation of the first bearing 80 and the third bearing 82.

[0029] See details Figure 1 and Figure 4 In this embodiment, the rotating shaft 60 is provided with a first journal 62 corresponding to the first bearing 80. The first bearing 80 is sleeved from the first end side to the first journal 62. The first journal 62 is provided with a first retaining ring 93 at the first end side of the first bearing 80. The stepped structure at the first journal 62 cooperates with the first retaining ring 93 to restrict the first bearing 80 from moving axially relative to the rotating shaft 60.

[0030] In this embodiment, the rotating shaft 60 is provided with a second journal 63 corresponding to the second bearing 81. The second bearing 81 is sleeved from the second end side to the second journal 63. The stepped structure at the second journal 63 cooperates with the second mounting groove 31 to restrict the second bearing 81 from moving axially relative to the rotating shaft 60.

[0031] In this embodiment, the drive shaft 70 is provided with a third journal corresponding to the third bearing 82. The third bearing 82 is sleeved from the second end side to the third journal. The third journal is provided with a second retaining ring 94 at the second end side of the third bearing 82. The stepped structure at the third journal, together with the second retaining ring 94, restricts the third bearing 82 from moving axially relative to the drive shaft 70.

[0032] In this embodiment, the second end of the rotating shaft 60 is provided with a keyway 66, and the first end of the drive shaft 70 is provided with a spline connected to the keyway 66. Through this simple connection structure of spline and keyway 66, the rotating shaft 60 transmits torque to the drive shaft 70. In some embodiments, a conventional coupling can be used to connect the rotating shaft 60 and the drive shaft 70. The drive shaft 70 has a third oil passage 71 inside. The first end of the third oil passage 71 communicates with the second oil passage 64, and the second end of the third oil passage 71 is used to introduce cooling oil. It should be noted that other oil inlet and outlet paths connected to the first oil passage 41, the second oil passage 64, and the third oil passage 71 need to be adjusted according to the layout of other components; therefore, this embodiment will not elaborate on them.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gearbox integrating an electric motor, characterized in that, include: The first housing (10) includes a first bottom wall (11), a first side wall (12) and a first opening; The second housing (20) includes a second bottom wall (21) and a second opening, the first opening being engaged with the second opening; The third housing (30) is fixedly disposed between the first housing (10) and the second housing (20); The motor part includes a stator assembly (40), a rotor assembly (50) and a shaft (60). The outer peripheral wall of the stator assembly (40) is fixedly connected to the first side wall (12). The rotor assembly (50) is rotatably disposed inside the stator assembly (40). The shaft (60) is fixedly connected to the rotor assembly (50). The first end of the shaft (60) is connected to the first bottom wall (11) through a first bearing (80), and the second end of the shaft (60) is connected to the third housing (30) through a second bearing (81). The transmission part includes a transmission shaft (70), the first end of which is rotatably connected to the rotating shaft (60), and the second end of which is provided with a third bearing (82) connected to the second bottom wall (21).

2. The gearbox with an integrated motor according to claim 1, characterized in that: The outer peripheral wall of the stator assembly (40) is interference-fitted with the first side wall (12).

3. The gearbox with an integrated motor according to claim 2, characterized in that: The stator assembly (40) has a groove (42) on its outer peripheral wall. The groove (42) cooperates with the first side wall (12) to form a first oil passage (41). Cooling oil is introduced into the first oil passage (41) to cool the stator assembly (40).

4. The gearbox with an integrated motor according to claim 3, characterized in that: The groove (42) includes several interconnected first groove sections (43) and several second groove sections (44). The first groove sections (43) extend along the axial direction of the stator assembly (40) and are evenly distributed along the circumferential direction of the stator assembly (40). The second groove sections (44) extend along the circumferential direction of the stator assembly (40) and are spaced apart along the axial direction of the stator assembly (40). Adjacent second groove sections (44) in the circumferential direction of the stator assembly (40) are staggered.

5. The gearbox with an integrated motor according to any one of claims 1-4, characterized in that: The rotor assembly (50) is sleeved on the rotating shaft (60), and a key structure is provided between the rotor assembly (50) and the rotating shaft (60). A pressure plate (90) is provided on the first end side of the rotating shaft (60), and a limiting shoulder (61) is formed on the second end side of the rotating shaft (60).

6. The gearbox with an integrated motor according to claim 5, characterized in that: A second oil passage (64) is provided in the rotating shaft (60), and an oil slinger hole (65) is provided on the rotating shaft (60) corresponding to the rotor assembly (50). The oil slinger hole (65) extends from the second oil passage (64) to the outside of the rotating shaft (60).

7. The gearbox with an integrated electric motor according to any one of claims 1-4, characterized in that: The first bottom wall (11) is provided with a first mounting groove (13) to accommodate the first bearing (80), and a first pull plate (91) is provided on the second end side of the first bearing (80). The first pull plate (91) is connected from the outside through the first bottom wall (11) by a first bolt. The third housing (30) is provided with a second mounting groove (31) on the first end side to accommodate the second bearing (81). The second bottom wall (21) is provided with a third mounting groove (23) to accommodate the third bearing (82), and a second pull plate (92) is provided on the first end side of the third bearing (82). The second pull plate (92) is connected from the outside through the second bottom wall (21) by a second bolt.

8. The gearbox with an integrated motor according to claim 6, characterized in that: The rotating shaft (60) is provided with a first journal (62) corresponding to the first bearing (80), and the first journal (62) is provided with a first retaining ring (93) on the first end side of the first bearing (80); the rotating shaft (60) is provided with a second journal (63) corresponding to the second bearing (81); the transmission shaft (70) is provided with a third journal corresponding to the third bearing (82), and the third journal is provided with a second retaining ring (94) on the second end side of the third bearing (82).

9. The gearbox with an integrated motor according to claim 8, characterized in that: The second end of the rotating shaft (60) is provided with a keyway (66), and the first end of the transmission shaft (70) is provided with a spline connected to the keyway (66).

10. The gearbox with an integrated motor according to claim 9, characterized in that: The drive shaft (70) is provided with a third oil passage (71), the first end of the third oil passage (71) is connected to the second oil passage (64), and the second end of the third oil passage (71) is used to introduce cooling oil.

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