Coaxial driving structure of high-speed gear motor of electric vehicle

Abstract

The utility model discloses an electric vehicle high-speed gear motor coaxial driving structure which comprises a bottom fork supporting shaft, a motor, a speed reducer and a hub, a motor rotating shaft is arranged in the motor, and the speed reducer comprises a reduction gear assembly, an input gear shaft and an output gear shaft. Rotating shaft positioning bearings are respectively arranged between the motor rotating shaft and the casing and the cover of the motor; an output positioning bearing is arranged between the input gear shaft and the output gear shaft; the bottom fork supporting shaft penetrates through the motor rotating shaft, the input gear shaft and the output gear shaft and is installed on the same axis, and hollow gaps are formed between the bottom fork supporting shaft and all the shafts. 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 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, in particular to a coaxial driving structure of a high-speed gear motor for electric vehicles. 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 provide a coaxial drive structure of a high-speed gear motor for an electric vehicle.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a coaxial drive structure of a high-speed gear motor of an electric vehicle, comprising a flat fork support shaft, a motor, a reducer, and a wheel hub, wherein the motor is provided with a motor shaft for power output, the reducer comprises a reduction gear assembly, and an input gear shaft and an output gear shaft respectively connected to the reduction gear assembly in a transmission manner, the input gear shaft and the output gear shaft are connected in a transmission manner to the motor shaft, and the output gear shaft is connected in a transmission manner to the wheel hub; shaft locating bearings are respectively provided between the motor shaft and the motor casing and the cover, and an output locating bearing is provided between the input gear shaft and the output gear shaft; the flat fork support 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 support shaft and the motor shaft, the input gear shaft, and the output gear shaft.

[0006] In the above-mentioned coaxial drive structure of the electric vehicle high-speed gear motor, an output shaft outer locating bearing is provided between the output gear shaft and the housing of the reducer, and the housing is fixedly connected to the casing of the motor.

[0007] In the above-mentioned coaxial drive structure of the electric vehicle high-speed gear motor, a left support bearing and a right support bearing are respectively provided between the flat fork support shaft and the motor shaft and the output gear shaft.

[0008] In the above-mentioned electric vehicle high-speed gear motor coaxial drive structure, the two ends of the flat fork support shaft are fixedly connected to the flat fork, and the side of the machine cover is provided with an anti-torque slot, and the flat square part of the flat fork is correspondingly stuck in the anti-torque slot.

[0009] In the above-mentioned coaxial drive structure of a high-speed gear motor of an electric vehicle, a mounting hole is provided on the wheel hub, and corresponding matching flat positions are provided on the mounting hole and the output gear shaft respectively. A locking nut for fixing the wheel hub is also provided on the output gear shaft, and a single-sided open through groove is axially opened on the locking nut, and a locking reinforcement screw is correspondingly provided on the locking nut at 90 degrees perpendicular to the single-sided open through groove.

[0010] In the above-mentioned electric vehicle high-speed gear motor coaxial drive structure, the motor also includes an encoder assembly, an induction magnetic ring corresponding to the encoder assembly is installed on the motor shaft, and the motor shaft and the induction magnetic ring are respectively provided with corresponding shaft positioning R grooves and R-shaped positioning bosses.

[0011] In the above-mentioned coaxial drive structure of the electric vehicle high-speed gear motor, the casing and the shell are respectively provided with intermediate gear shaft bearings for connecting and positioning the reduction gear assembly.

[0012] In the above-mentioned electric vehicle high-speed gear motor coaxial drive structure, the casing and the shell are respectively provided with a motor chamber oil seal and an output shaft outer oil seal, and the motor chamber oil seal and the output shaft outer oil seal seal the inside of the reducer.

[0013] In the above-mentioned coaxial drive structure of a high-speed gear motor of an electric vehicle, the interior of the reducer is connected to the hollow gap between the flat fork support shaft and the motor shaft, the input gear shaft, and the output gear shaft, and an output shaft inner oil seal and a shaft oil seal are respectively provided between the flat fork support shaft and the output gear shaft and the motor shaft.

[0014] In the above-mentioned coaxial drive structure of the electric vehicle high-speed gear motor, the housing and the cover are respectively provided with rotor bearing grooves for installing the rotating shaft locating bearing, and the output gear shaft is provided with an output locating bearing groove for installing the output locating bearing.

[0015] The beneficial effects of the utility model are:

[0016] The utility model arranges the transmission between the motor and the wheel hub on the same axis, and there is a hollow gap between the flat fork support shaft and the motor shaft, the input gear shaft and the output gear shaft. At the same time, the motor shaft, the input gear shaft and the 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 does the drive mode have a short transmission path, a compact structure and high power transmission efficiency, but the positioning design between the power transmission components effectively prevents the occurrence of axial transmission movement, thereby ensuring power transmission efficiency.

[0017] In the utility model, an anti-torque slot is provided on the side of the motor cover, and the flat square part of the connected flat fork is correspondingly clamped in the anti-torque slot, so that an anti-torque positioning is formed between the motor and the flat fork, and the housing of the reducer is fixed to the motor casing. The motor casing, the cover, and the housing of the reducer play a positioning role in the installation of the motor shaft, the input gear shaft, the reduction gear assembly, and the output gear shaft, thereby improving the stability and transmission efficiency of power transmission through the anti-torque positioning design on the motor.

[0018] The utility model provides a single-sided open through slot and a locking reinforcement screw which is 90 degrees perpendicular to the single-sided open through slot on the locking nut between the output gear shaft and the wheel hub. The locking reinforcement screw greatly improves the reliability of the locking nut pressing the wheel hub through the single-sided open through slot, ensures that the locking nut will not loosen when the wheel hub is running, and improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 It is an exploded view of the utility model;

[0022] Figure 4 It is an exploded view between the motor and the wheel hub in the utility model;

[0023] Figure 5 It is an exploded view of the motor in the utility model. DETAILED DESCRIPTION

[0024] 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.

[0025] The utility model is further described below in conjunction with the drawings.

[0026] See also Figures 1 to 5 The utility model provides a coaxial drive structure of a high-speed gear motor of an electric vehicle, including a flat fork support shaft 1, a motor 2, a reducer 3, and a wheel hub 4. The reducer 3 is fixedly connected and installed as a whole with the motor 2, and the wheel hub 4 is transmission-connected with the reducer 3. The flat fork support 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 5.

[0027] The motor 2 includes a casing 6, a cover 7, a stator 8, and a rotor 9. The casing 6 and the cover 7 are fixedly connected, and the stator 8 and the rotor 9 are installed in the casing 6 and the cover 7. The motor 2 is provided with a motor shaft 10 for power output, and the motor shaft 10 is connected to the rotor 9 in the motor 2; shaft locating bearings 11 are respectively provided between the motor shaft 10 and the casing 6 and the cover 7 of the motor 2, and rotor bearing grooves 12 for installing the shaft locating bearings 11 are respectively provided on the casing 6 and the cover 7.

[0028] The reducer 3 is installed on one side of the motor 2 through its housing 13. The housing 13 of the reducer 3 is fixedly connected to the housing 6 of the motor 2. The reducer 3 includes a reduction gear assembly 14, and an input gear shaft 15 and an output gear shaft 16 respectively connected to the reduction gear assembly 14 in a transmission manner; the housing 6 and the housing 13 are respectively provided with an intermediate gear shaft bearing 17 for connecting and positioning the reduction gear assembly 14, an output positioning bearing 18 is provided between the input gear shaft 15 and the output gear shaft 16, and the input gear shaft 15 is connected to the motor shaft 10 in a transmission manner, that is, the two are fixedly connected An output shaft outer locating bearing 19 is provided between the output gear shaft 16 and the housing 13 of the reducer 3. The output gear shaft 16 is transmission-connected to the wheel hub 4. An output locating bearing groove 20 for mounting the output locating bearing 18 is provided on the output gear shaft 16. The input gear shaft 15 uses a small-module gear for small torque, and the reduction gear assembly 14 uses a large-module gear for large torque. The gears in the input gear shaft 15, the reduction gear assembly 14, and the output gear shaft 16 all use helical teeth, and the reduction gear assembly 14 has the same direction helix angle, which can solve the axial force and high noise problems of the helical teeth.

[0029] The flat fork supporting shaft 1 passes through the motor shaft 10, the input gear shaft 15, and the output gear shaft 16 and is installed on the same axis, and there is a hollow gap between the flat fork supporting shaft 1 and the motor shaft 10, the input gear shaft 15, and the output gear shaft 16; specifically, a left support bearing 22 and a right support bearing 23 are respectively provided between the flat fork supporting shaft 1 and the motor shaft 10, and the output gear shaft 16, so that the above-mentioned hollow gap is formed between the flat fork supporting shaft 1 and the motor shaft 10, the input gear shaft 15, and the output gear shaft 16.

[0030] When power transmission is performed, the power of the motor 2 is transmitted to the reduction gear assembly 14 through the motor shaft 10 and the input gear shaft 15, and the reduction gear assembly 14 then transmits power through the cooperation of the output gear shaft 16, thereby transmitting the power to the wheel hub 4 connected to the output gear shaft 16 for driving; during the power transmission process, the shaft positioning bearing 11, the output positioning bearing 18, and the output shaft outer positioning bearing 19 axially position the power transmission between the motor shaft 10, the input gear shaft 15, and the output gear shaft 16, 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.

[0031] Furthermore, both ends of the flat fork support shaft 1 are fixedly connected to the flat fork 5, and the side of the cover 7 is provided with an anti-torque slot 24, and the flat square part of the flat fork 5 is correspondingly stuck in the anti-torque slot 24, so that an anti-torque positioning is formed between the motor 2 and the flat fork 5, and the housing 13 of the reducer 3 is fixed to the casing 6 of the motor 2. The casing 6 of the motor 2, the cover 7, and the housing 13 of the reducer 3 play a positioning role in the installation of the motor shaft 10, the input gear shaft 15, the reduction gear assembly 14, and the output gear shaft 16, thereby improving the stability and transmission efficiency of power transmission through the anti-torque positioning design on the motor 2.

[0032] Furthermore, the wheel hub 4 is provided with a mounting hole 25, and the mounting hole 25 and the output gear shaft 16 are respectively provided with corresponding matching flat positions 26. The output gear shaft 16 is also provided with a locking nut 27 for fixing the wheel hub 4, and the locking nut 27 has a single-sided open through groove 28 axially opened, and the locking nut 27 is correspondingly provided with a locking reinforcement screw 29 which is 90 degrees perpendicular to the single-sided open through groove.

[0033] Furthermore, the motor 2 also includes an encoder assembly 30, which is fixed on the machine cover 7. An induction magnetic ring 31 corresponding to the encoder assembly 30 is installed on the motor shaft 10. The motor shaft 10 and the induction magnetic ring 31 are respectively provided with corresponding shaft positioning R grooves 32 and R-shaped positioning bosses 33; the assembly between the induction magnetic ring 31 and the motor shaft 10 is facilitated, so as to quickly unify the relative position correspondence between the induction magnetic ring 31 and the encoder assembly 30, thereby ensuring the angle consistency of batch products.

[0034] Furthermore, the casing 6 and the shell 13 are respectively provided with a motor room oil seal 34 and an output shaft outer oil seal 35, which seal the interior of the reducer 3. At the same time, the interior of the reducer 3 is connected with the hollow gap between the flat fork support shaft 1 and the motor shaft 10, the input gear shaft 15, and the output gear shaft 16. At the same time, an output shaft inner oil seal 36 and a shaft oil seal 37 are respectively provided between the flat fork support shaft 1 and the output gear shaft 16 and the motor shaft 10; on the one hand, the sealing of each connection is ensured, and at the same time, the oil in the reducer is connected with the hollow gap between the flat fork support shaft 1 and the motor shaft 10, the input gear shaft 15, and the output gear shaft 16. The designed hollow gap can also play an effect of dissipating heat for axial rotation.

[0035] The above is a detailed introduction to a coaxial drive structure of a high-speed gear motor for an electric vehicle 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 structure of a high-speed gear motor for an electric vehicle, comprising a flat fork support 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 (10) for power output. The reducer (3) comprises a reduction gear assembly (14), and an input gear shaft (15) and an output gear shaft (16) respectively connected to the reduction gear assembly (14). The input gear shaft (15) and the output gear shaft (16) are connected to the motor shaft (10) and the output gear shaft (16) is connected to the wheel hub (4). A shaft positioning bearing (11) is respectively provided between the motor shaft (10) and the housing (6) and the cover (7) of the motor (2). An output positioning bearing (18) is provided between the input gear shaft (15) and the output gear shaft (16). The flat fork support shaft (1) passes through the motor shaft (10), the input gear shaft (15) and the output gear shaft (16) and is installed on the same axis. A hollow gap is provided between the flat fork support shaft (1) and the motor shaft (10), the input gear shaft (15) and the output gear shaft (16).

2. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: An output shaft outer positioning bearing (19) is provided between the output gear shaft (16) and the housing (13) of the reducer (3), and the housing (13) is fixedly connected to the casing (6) of the motor (2).

3. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: A left support bearing (22) and a right support bearing (23) are respectively provided between the flat fork support shaft (1), the motor shaft (10) and the output gear shaft (16).

4. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: The two ends of the flat fork support shaft (1) are fixedly connected to the flat fork (5); a counter-torque clamping groove (24) is provided on the side of the machine cover (7); and the flat square portion of the flat fork (5) is correspondingly clamped in the counter-torque clamping groove (24).

5. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: The wheel hub (4) is provided with a mounting hole (25), and the mounting hole (25) and the output gear shaft (16) are respectively provided with corresponding matching flat positions (26). The output gear shaft (16) is also provided with a locking nut (27) for fixing the wheel hub (4), and the locking nut (27) is axially provided with a single-sided open slot (28), and the locking nut (27) is correspondingly provided with a locking reinforcing screw (29) perpendicular to the single-sided open slot (28) at 90 degrees.

6. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: The motor (2) further comprises an encoder assembly (30), an induction magnetic ring (31) corresponding to the encoder assembly (30) is mounted on the motor shaft (10), and the motor shaft (10) and the induction magnetic ring (31) are respectively provided with corresponding shaft positioning R grooves (32) and R-shaped positioning bosses (33).

7. The electric vehicle high-speed gear motor coaxial drive structure according to claim 2, characterized in that: The casing (6) and the housing (13) are respectively provided with an intermediate gear shaft bearing (17) for connecting and positioning the reduction gear assembly (14).

8. The electric vehicle high-speed gear motor coaxial drive structure according to claim 2, characterized in that: A motor chamber oil seal (34) and an output shaft outer oil seal (35) are respectively provided on the casing (6) and the housing (13), and the motor chamber oil seal (34) and the output shaft outer oil seal (35) seal the interior of the reducer (3).

9. The electric vehicle high-speed gear motor coaxial drive structure according to claim 8, characterized in that: The interior of the reducer (3) is connected to the hollow gap between the flat fork support shaft (1) and the motor shaft (10), the input gear shaft (15), and the output gear shaft (16); an output shaft inner oil seal (36) and a shaft oil seal (37) are provided between the flat fork support shaft (1) and the output gear shaft (16), and the motor shaft (10), respectively.

10. The electric vehicle high-speed gear motor coaxial drive structure according to claim 1, characterized in that: The housing (6) and the cover (7) are respectively provided with a rotor bearing groove (12) for mounting a rotating shaft locating bearing (11), and the output gear shaft (16) is provided with an output locating bearing groove (20) for mounting an output locating bearing (18).

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