Electric vehicle motor coaxial driving positioning connection structure

Abstract

The utility model discloses an electric vehicle motor coaxial drive positioning connection structure which comprises a bottom fork shaft, a motor, a speed reducer and a hub. A motor rotating shaft for power output is arranged in the motor; the speed reducer comprises a reduction gear set, an input gear shaft and an output gear shaft; a rotating shaft positioning bearing is arranged in the motor, an output inner positioning bearing is arranged between the end of the input gear shaft and the end of the output gear shaft, an output outer positioning bearing is arranged on a shell of the speed reducer, and the bottom fork shaft penetrates through the rotating shaft of the motor, the input gear shaft and the output gear shaft, is installed on the same axis and forms a hollow gap. The transmission between the motor and the hub is arranged on the same axis, the rotating shaft positioning bearing, the output positioning bearing and the output shaft outer positioning bearing are arranged to position the power output component, the transmission path of the driving mode is short, the structure is compact, and the power transmission efficiency is high; and due to the positioning design between the power transmission parts, axial transmission movement is effectively prevented, and the power transmission efficiency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed gear motors for electric vehicles, and in particular to a coaxial drive positioning connection structure for a motor of an electric vehicle. Background Art

[0002] In the field of electric drive for pure electric vehicles, the commonly used structural forms are the wheel hub motor method and the mid-mounted motor method. Although the wheel hub motor method has a simple structure and no intermediate transmission device, the wheel hub motor is heavy, has a large moment of inertia and low efficiency, which not only affects the handling performance of the vehicle, but also increases material costs; the mid-mounted motor has a longer power transmission path.

[0003] With the development of electric vehicle technology, the motor part structure is arranged on the spoke side of the wheel hub to form a side-mounted motor. The side-mounted motor usually has a power part and an output part. The output part is respectively connected to the side-mounted motor and the wheel hub for transmission, so that the power of the rotor is transmitted to the wheel hub through the output shaft to drive the wheel hub to rotate; therefore, the connection between the power transmission components and the positioning design are particularly important, but the existing structure has a complex transmission structure and large loss, which affects the transmission efficiency. At the same time, the positioning part of the transmission component is stable and prone to axial transmission movement, which in turn affects the transmission efficiency. Therefore, it is very necessary to improve the defects of the existing structure. Summary of the invention

[0004] The purpose of the utility model is to solve the problems raised in the above background technology and to provide a coaxial drive positioning connection structure for an electric vehicle motor.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows: a coaxial drive positioning connection structure of an electric vehicle motor, comprising a flat fork shaft, a motor, a reducer, and a wheel hub; the motor is provided with a motor shaft for power output, the reducer comprises a reduction gear set, and an input gear shaft and an output gear shaft respectively connected to the reduction gear set in a transmission manner, the input gear shaft is tightly matched and connected to the end of the motor shaft in a transmission manner, and the output gear shaft is connected to the input gear shaft in a transmission manner through the reduction gear set; the housing of the reducer is fixedly connected to the side of the motor, the motor is provided with a shaft positioning bearing for positioning the motor shaft, an output inner positioning bearing is provided between the ends of the input gear shaft and the output gear shaft, an output outer positioning bearing for positioning the output gear shaft is provided on the housing of the reducer, a coaxial transmission is formed between the motor shaft, the input gear shaft, and the output gear shaft, and the shaft positioning bearing, the output inner positioning bearing, and the output outer positioning bearing form axial positioning for each component of the axial transmission; the flat fork shaft passes through the motor shaft, the input gear shaft, and the output gear shaft and is installed on the same axis, and there is a hollow gap between the flat fork shaft and the motor shaft, the input gear shaft, and the output gear shaft.

[0006] In the above-mentioned coaxial drive positioning connection structure of an electric vehicle motor, a fork shaft right bearing, a fork shaft left bearing, a fork shaft right oil seal, and a fork shaft left oil seal are respectively provided between the flat fork shaft and the motor shaft and the output gear shaft. A motor chamber oil seal and an output shaft oil seal for sealing the interior of the reducer are respectively provided on the side surface and the shell of the motor. The hollow gap between the flat fork shaft and the motor shaft, the input gear shaft, and the output gear shaft is connected to the interior of the reducer through the input gear shaft.

[0007] In the above-mentioned coaxial drive positioning connection structure of an electric vehicle motor, the motor includes a casing, a cover, a stator, and a rotor. The motor shaft is fixedly connected to the rotor, the housing in the reducer is fixed to the cover, and the casing, the cover, and the motor shaft are respectively provided with a bearing fixing groove for installing a shaft positioning bearing.

[0008] In the above-mentioned electric vehicle motor coaxial drive positioning connection structure, the corresponding ends of the input gear shaft and the output gear shaft are respectively provided with bearing fixing grooves 2 for installing the output inner positioning bearing.

[0009] In the above-mentioned electric vehicle motor coaxial drive positioning connection structure, a bearing fixing groove three for installing the output external positioning bearing is respectively provided between the housing of the reducer and the output gear shaft.

[0010] In the above-mentioned electric vehicle motor coaxial drive positioning connection structure, the motor housing and the reducer housing are respectively provided with intermediate gear shaft bearings for connecting and positioning the reduction gear set.

[0011] In the above-mentioned electric vehicle motor coaxial drive positioning connection structure, the reduction gear group includes an intermediate gear shaft and a transmission gear. The intermediate gear shaft bearings position the two ends of the intermediate gear shaft. The transmission gear is fixedly mounted on the intermediate gear shaft and meshingly connected with the input gear shaft. The intermediate gear shaft is meshingly connected with the output gear shaft.

[0012] In the above-mentioned electric vehicle motor coaxial drive positioning connection structure, the gears in the input gear shaft, the intermediate gear shaft, the transmission gear, and the output gear shaft all use helical teeth, and the intermediate gear shaft and the transmission gear have the same direction helix angle.

[0013] The beneficial effects of the utility model are:

[0014] The utility model arranges the transmission between the motor and the wheel hub on the same axis, and at the same time, the motor shaft, input gear shaft, and output gear shaft are respectively provided with shaft locating bearings, output locating bearings, and output shaft outer locating bearings to position the power output components. Not only is the drive mode transmission path short, the structure is compact, and the power transmission efficiency is high, but the positioning design between the power transmission components effectively prevents the occurrence of axial transmission movement, thereby ensuring power transmission efficiency.

[0015] At the same time, there is a hollow gap between the parallel fork shaft and the motor shaft, the input gear shaft, and the output gear shaft, and the oil in the reducer is connected with the hollow gap between the parallel fork shaft and the motor shaft, the input gear shaft, and the output gear shaft, so that the oil enters into the designed hollow gap and has a heat dissipation effect on the various components of the axial transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 It is a three-dimensional cross-sectional view of a partial structure of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the implementation mode of the utility model clearer, the technical solution in the implementation mode of the utility model will be clearly and completely described below in conjunction with the figures in the implementation mode of the utility model; in the description of the utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the figure, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0020] The utility model is further described below in conjunction with the drawings.

[0021] See also Figures 1 to 3 The utility model provides a coaxial drive positioning connection structure of an electric vehicle motor, comprising a flat fork shaft 1, a motor 2, a reducer 3, and a wheel hub 4; the reducer 3 is fixedly connected and installed with the motor 2 as a whole, the wheel hub 4 is transmission-connected with the reducer 3, the flat fork shaft 1 passes through the middle of the motor 2 and the reducer 3, and then both ends are fixedly connected with the flat fork 30.

[0022] The motor 2 includes a casing 19, a cover 20, a stator 21, and a rotor 22. The casing 19 and the cover 20 are fixedly connected, and the stator 21 and the rotor 22 are installed in the casing 19 and the cover 20. The motor 2 is provided with a motor shaft 5 for power output, and the motor shaft 5 is fixedly connected to the rotor 22. The housing 3-1 in the reducer 3 is fixed to the cover 20. The motor 2 is provided with a shaft positioning bearing 9 for positioning the motor shaft 5. The casing 19, the cover 20, and the motor shaft 5 are respectively provided with a bearing fixing groove 23 for installing the shaft positioning bearing 9.

[0023] The reducer 3 includes a reduction gear group 6, and an input gear shaft 7 and an output gear shaft 8 which are respectively connected to the reduction gear group 6. The input gear shaft 7 is tightly connected to the end of the motor shaft 5, and the output gear shaft 8 is connected to the input gear shaft 7 through the reduction gear group 6. An output inner locating bearing 10 is provided between the ends of the input gear shaft 7 and the output gear shaft 8. The corresponding ends of the input gear shaft 7 and the output gear shaft 8 are respectively provided with bearing fixing grooves 24 for installing the output inner locating bearing 10. An output outer locating bearing 11 for positioning the output gear shaft 8 is provided on the housing 3-1 of the reducer 3. Bearing fixing grooves 3 25 for installing the output outer locating bearing 11 are respectively provided between the housing 3-1 of the reducer 3 and the output gear shaft 8.

[0024] Specifically, the housing 19 of the motor 2 and the housing 3-1 of the reducer 3 are respectively provided with intermediate gear shaft bearings 26 for connecting and positioning the reduction gear set 6. The reduction gear set 6 includes an intermediate gear shaft 27 and a transmission gear 28. The intermediate gear shaft bearings 26 position the two ends of the intermediate gear shaft 27. The transmission gear 28 is fixedly mounted on the intermediate gear shaft 27 and meshed with the input gear shaft 7 for transmission connection. The intermediate gear shaft 27 is meshed with the output gear shaft 8 for transmission connection.

[0025] The motor shaft 5, input gear shaft 7 and output gear shaft 8 form a coaxial transmission, and the shaft positioning bearing 9, output inner positioning bearing 10 and output outer positioning bearing 11 form axial positioning for each component of the axial transmission; the flat fork shaft 1 passes through the motor shaft 5, input gear shaft 7 and output gear shaft 8 and is installed on the same axis, and there is a hollow gap 12 between the flat fork shaft 1 and the motor shaft 5, input gear shaft 7 and output gear shaft 8; specifically, a fork shaft right bearing 13, a fork shaft left bearing 14, a fork shaft right oil seal 15 and a fork shaft left oil seal 16 are respectively provided between the flat fork shaft 1 and the motor shaft 5 and the output gear shaft 8, and a motor chamber oil seal 17 and an output shaft oil seal 18 for sealing the inside of the reducer 3 are respectively provided on the side of the motor 2 and the housing 3-1, and the hollow gap 12 between the flat fork shaft 1 and the motor shaft 5, input gear shaft 7 and output gear shaft 8 is communicated with the inside of the reducer 3 through the input gear shaft 7.

[0026] When power transmission is performed, the power of the motor 2 is transmitted to the reduction gear set 6 through the motor shaft 5 and the input gear shaft 7, and the reduction gear set 6 then transmits power through the cooperation of the output gear shaft 8, thereby transmitting the power to the wheel hub 4 connected to the output gear shaft 8 for driving; in the process of power transmission, the shaft positioning bearing 9, the output positioning bearing 10, and the output shaft outer positioning bearing 11 axially position the power transmission between the motor shaft 5, the input gear shaft 7, and the output gear shaft 8, which not only has a short drive transmission path, a compact structure, and high power transmission efficiency, but also the positioning design between the power transmission components effectively prevents the occurrence of axial transmission movement, thereby ensuring power transmission efficiency.

[0027] At the same time, there is a hollow gap 12 between the parallel fork shaft 1 and the motor shaft 5, the input gear shaft 7, and the output gear shaft 8, and the oil in the reducer 3 is connected with the hollow gap 12 between the parallel fork shaft 1 and the motor shaft 5, the input gear shaft 7, and the output gear shaft 8, so that the oil enters into the designed hollow gap to dissipate heat for the various components of the axial transmission.

[0028] Furthermore, the gears in the input gear shaft 7, the intermediate gear shaft 27, the transmission gear 28, and the output gear shaft 8 all use helical teeth, and the intermediate gear shaft 27 and the transmission gear 28 have the same helix angle, which can solve the axial force and high noise problems of the helical teeth.

[0029] The above is a detailed introduction to a coaxial drive positioning connection structure of an electric vehicle motor provided by an embodiment of the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the technical solution disclosed by the utility model; at the same time, for general technical users in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation of the utility model.

Claims

1. A coaxial drive positioning connection structure for an electric vehicle motor, comprising a flat fork shaft (1), a motor (2), a reducer (3), and a wheel hub (4); characterized in that: The motor (2) is provided with a motor shaft (5) for power output; the reducer (3) comprises a reduction gear set (6), and an input gear shaft (7) and an output gear shaft (8) respectively connected to the reduction gear set (6); the input gear shaft (7) is tightly connected to the end of the motor shaft (5); the output gear shaft (8) is connected to the input gear shaft (7) through the reduction gear set (6); the housing (3-1) of the reducer (3) is fixedly connected to the side of the motor (2); the motor (2) is provided with a shaft positioning bearing (9) for positioning the motor shaft (5); an output inner bearing (9) is provided between the ends of the input gear shaft (7) and the output gear shaft (8); A positioning bearing (10), an output outer positioning bearing (11) for positioning the output gear shaft (8) is provided on the housing (3-1) of the reducer (3), a coaxial transmission is formed between the motor shaft (5), the input gear shaft (7), and the output gear shaft (8), and the shaft positioning bearing (9), the output inner positioning bearing (10), and the output outer positioning bearing (11) form axial positioning for each component of the axial transmission; the flat fork shaft (1) passes through the motor shaft (5), the input gear shaft (7), and the output gear shaft (8) and is installed on the same axis, and a hollow gap (12) is provided between the flat fork shaft (1) and the motor shaft (5), the input gear shaft (7), and the output gear shaft (8).

2. The electric vehicle motor coaxial drive positioning connection structure according to claim 1, characterized in that: A fork shaft right bearing (13), a fork shaft left bearing (14), a fork shaft right oil seal (15), and a fork shaft left oil seal (16) are respectively provided between the flat fork shaft (1) and the motor shaft (5) and the output gear shaft (8); a motor chamber oil seal (17) and an output shaft oil seal (18) for sealing the interior of the reducer (3) are respectively provided on the side surface of the motor (2) and the housing (3-1); and a hollow gap (12) between the flat fork shaft (1) and the motor shaft (5), the input gear shaft (7), and the output gear shaft (8) communicates with the interior of the reducer (3) via the input gear shaft (7).

3. The electric vehicle motor coaxial drive positioning connection structure according to claim 1, characterized in that: The motor (2) comprises a housing (19), a cover (20), a stator (21), and a rotor (22); the motor shaft (5) is fixedly connected to the rotor (22); the housing (3-1) in the reducer (3) is fixed to the cover (20); and the housing (19), the cover (20), and the motor shaft (5) are respectively provided with a bearing fixing groove (23) for mounting a shaft positioning bearing (9).

4. The electric vehicle motor coaxial drive positioning connection structure according to claim 1, characterized in that: The corresponding ends of the input gear shaft (7) and the output gear shaft (8) are respectively provided with a second bearing fixing groove (24) for mounting the output inner positioning bearing (10).

5. The electric vehicle motor coaxial drive positioning connection structure according to claim 1, characterized in that: A bearing fixing groove (25) for mounting an output external locating bearing (11) is provided between the housing (3-1) of the reducer (3) and the output gear shaft (8).

6. The electric vehicle motor coaxial drive positioning connection structure according to claim 3, characterized in that: The housing (19) of the motor (2) and the housing (3-1) of the reducer (3) are respectively provided with intermediate gear shaft bearings (26) for connecting and positioning the reduction gear set (6).

7. The electric vehicle motor coaxial drive positioning connection structure according to claim 6, characterized in that: The reduction gear set (6) comprises an intermediate gear shaft (27) and a transmission gear (28); the intermediate gear shaft bearing (26) positions both ends of the intermediate gear shaft (27); the transmission gear (28) is fixedly mounted on the intermediate gear shaft (27) and meshes with the input gear shaft (7) for transmission connection; and the intermediate gear shaft (27) is meshed with the output gear shaft (8) for transmission connection.

8. The electric vehicle motor coaxial drive positioning connection structure according to claim 7, characterized in that: The gears in the input gear shaft (7), the intermediate gear shaft (27), the transmission gear (28), and the output gear shaft (8) all use helical teeth, and the intermediate gear shaft (27) and the transmission gear (28) have the same helical angle.

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