Transmission lubricating structure for electric vehicle

Abstract

The invention discloses a transmission lubricating structure for an electric vehicle. The transmission lubricating structure comprises a frame, a hub, a motor and a wheel shaft. A transmission installation end cover is arranged at the end of a shell of the motor, a transmission installation cavity is formed in the transmission installation end cover, a transmission assembly is arranged in the transmission installation cavity and comprises a gear ring and a power output shaft disc, and the end of a rotating shaft of the motor is in meshing transmission with the gear ring. The wheel shaft penetrates through the transmission installation end cover and the power output shaft disc to be connected, the transmission installation cavity is a sealed cavity, lubricating oil is injected into the transmission installation cavity, and the gear ring and the power output shaft disc are partially located in the lubricating oil in the transmission installation cavity. A transmission connection structure between the output shaft of the motor and the hub is redesigned, the output shaft of the motor and the axle in the electric car are not traditionally coaxially installed, transmission parts between the motor and the hub can be immersed in lubricating oil, the transmission lubricating effect is improved, the transmission reliability is guaranteed, and meanwhile rotation positioning between the transmission parts is reliable and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a transmission lubrication structure for electric vehicles. Background Art

[0002] Electric vehicles include two-wheeled electric vehicles and three-wheeled electric vehicles, which are important means of transportation for urban and rural residents. The wheel hub is the core supporting component, and the wheel hub is connected to the frame through the wheel axle, and the motor provides the driving power of the electric vehicle; in the existing structural technology, the motor is installed on the wheel hub, the stator part of the motor is installed on the wheel axle, and the rotor part of the motor is fixedly installed with the wheel hub, so as to drive the wheel hub to rotate during operation. Since the motor and the wheel axle are installed coaxially in the existing technology, the rotating parts between the motor parts and the wheel axle can only be filled with lubricating grease to play a lubricating role. In the later stage, as the use increases, the lubrication effect of the driving rotating connection is used, which affects the performance of the electric vehicle; therefore, it is very necessary to improve the existing structural design defects. Summary of the invention

[0003] The purpose of the present invention is to solve the problems raised in the above background technology and to provide a transmission lubrication structure for electric vehicles.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a transmission lubrication structure for an electric vehicle, comprising a frame, a wheel hub, a motor, and a wheel axle; a transmission mounting end cover is provided at the shell end of the motor, a transmission mounting end cover is provided in a transmission mounting cavity, a transmission assembly is provided in the transmission mounting cavity, the transmission assembly comprises a gear ring and a power output shaft disc, the gear ring is fixedly connected to the power output shaft disc, the end of the rotating shaft of the motor is meshed with the gear ring for transmission, and the power output shaft disc is fixedly connected to the wheel hub; the wheel axle passes through the transmission mounting end cover and the power output shaft disc for connection, the wheel axle can rotate relative to the transmission mounting end cover and the power output shaft disc, and the motor is fixedly connected to the frame through the rear end cover of the motor at the same time; the transmission mounting cavity is a sealed cavity, which is filled with lubricating oil, and the gear ring and the power output shaft disc are partially in the lubricating oil in the transmission mounting cavity.

[0005] In the above-mentioned transmission lubrication structure for electric vehicles, the power output shaft disk includes a mounting disk and an output shaft. The output shaft is rotatably connected to the wheel axle and the transmission mounting end cover through bearings. The gear ring is fixed in the mounting disk. The gear ring and the mounting disk are partially in the lubricating oil in the transmission mounting cavity. The output shaft is fixedly connected to the wheel hub.

[0006] In the above-mentioned transmission lubrication structure for electric vehicles, the transmission mounting end cover includes a front mounting cover and a rear mounting cover, the front mounting cover and the rear mounting cover are sealed and fixedly connected to form a transmission mounting cavity, and the wheel axle passes through the front mounting cover and the rear mounting cover for connection.

[0007] In the above-mentioned transmission lubrication structure for electric vehicles, a positioning device is provided between the front mounting cover and the rear mounting cover, and the positioning device can form a side rolling abutment with the mounting plate.

[0008] In the above-mentioned transmission lubrication structure for electric vehicles, the rear mounting cover and the housing of the motor are an integrated structure, and the front mounting cover is fixedly connected to the rear mounting cover by bolts.

[0009] In the above-mentioned transmission lubrication structure for electric vehicles, the positioning device includes a mounting rod and a positioning bearing. Both ends of the mounting rod are fixedly mounted on the front mounting cover and the rear mounting cover. The positioning bearing is mounted on the mounting rod, and the positioning bearing can form a side rolling abutment with the mounting plate.

[0010] In the above-mentioned transmission lubrication structure for electric vehicles, the output shaft and the wheel hub are screwed and fixed, and the direction of rotation of the output shaft is opposite to the forward rotation direction of the wheel hub.

[0011] In the above-mentioned transmission lubrication structure for electric vehicles, the wheel hub includes a hub connecting disk, a hub frame, and a hub ring. The output shaft is tightened and fixed to the hub connecting disk in the wheel hub. A fixed step is provided on the output shaft and abuts against the hub connecting disk. A brake disk corresponding to the hub connecting disk is installed on the wheel axle.

[0012] In the above-mentioned transmission lubrication structure for electric vehicles, a dustproof sealing ring is arranged between the wheel axle and the rear mounting cover, and corresponding positioning bosses and positioning grooves are also arranged between the wheel axle and the rear mounting cover.

[0013] In the above-mentioned transmission lubrication structure for electric vehicles, the wheel hub connecting disc and the brake disc correspond to form a brake cavity, the brake disc is fixedly installed on the wheel axle, and the gap between the brake disc and the output shaft, as well as the threaded connection between the output shaft and the wheel hub connecting disc are all correspondingly located in the formed brake cavity.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects: The present invention redesigns the transmission connection structure between the motor output shaft and the wheel hub. The motor output shaft and the wheel axle in the tram are not installed coaxially as in the traditional way. The transmission components between the motor and the wheel hub can be immersed in lubricating oil, which improves the transmission lubrication effect and ensures the reliability of the transmission. At the same time, the rotation positioning between the transmission components is reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , Figure 2 It is a stereogram of the present invention in two different directions; Figure 3 is a three-dimensional cross-sectional view of the present invention; Figure 4 yes Figure 3 A magnified view of part A; Figure 5 yes Figure 3 A magnified view of part B; Figure 6 , Figure 7 It is a stereoscopic view of the transmission assembly in the present invention from two different directions. DETAILED DESCRIPTION

[0016] The present invention will be further described in conjunction with the accompanying drawings.

[0017] See also Figures 1 to 7 The present invention provides a transmission lubrication structure for an electric vehicle, comprising a frame 1, a wheel hub 2, a motor 3, and a wheel axle 4; a transmission mounting end cover 5 is provided at the end of a housing 3-1 of the motor 3, a transmission mounting end cover 5 is provided in a transmission mounting cavity 6, a transmission assembly is provided in the transmission mounting cavity 6, the transmission assembly comprises a gear ring 7, a power output shaft disc 8, the power output shaft disc 8 comprises a mounting disc 9, an output shaft 10, the output shaft 10 is rotatably connected to the wheel axle 4 and the transmission mounting end cover 5 through a bearing 11, the wheel axle 4 passes through the transmission mounting end cover 5 and the power output shaft disc 8 for connection, the wheel axle 4 can rotate relative to the transmission mounting end cover 5 and the power output shaft disc 8, and the motor 3 is fixedly connected to the frame 1 through the rear end cover 3-2 of the motor 3.

[0018] The gear ring 7 is fixed in the mounting plate 9, so that the gear ring 7 is fixedly connected with the power output shaft plate 8, the end of the rotating shaft of the motor 3 is meshed with the gear ring 7 for transmission, the output shaft 10 in the power output shaft plate 8 is fixedly connected with the wheel hub 2, the transmission mounting cavity 6 is a sealed cavity filled with lubricating oil, and the gear ring 7 and the mounting plate 9 of the power output shaft plate 8 are partially in the lubricating oil in the transmission mounting cavity 6. Thus, the transmission has the effect of lubrication and heat dissipation.

[0019] Further, the transmission mounting end cover 5 includes a front mounting cover 12 and a rear mounting cover 13, the front mounting cover 12 and the rear mounting cover 13 are sealed and fixedly connected to form a transmission mounting cavity 6, and the axle 4 is connected through the front mounting cover 12 and the rear mounting cover 13. Preferably, the rear mounting cover 13 and the housing 3-1 of the motor 3 are an integral structure, and the front mounting cover 12 is fixedly connected to the rear mounting cover 13 by bolts.

[0020] Furthermore, a positioning device 14 is provided between the front mounting cover 12 and the rear mounting cover 13, and the positioning device 14 includes a mounting rod 15 and a positioning bearing 16. Both ends of the mounting rod 15 are fixedly mounted on the front mounting cover 12 and the rear mounting cover 13, and the positioning bearing 16 is mounted on the mounting rod 15. The positioning bearing 16 can form a side rolling abutment with the mounting plate 9. When the motor rotates at a low speed, there is a gap between the positioning bearing 16 and the mounting plate 9, and when the motor runs at a high speed, the mounting plate 9 generates a high-speed rotating centrifugal force, and the positioning bearing 16 can form a side rolling abutment with the mounting plate 9, thereby improving the stability of the transmission.

[0021] Furthermore, the wheel hub 2 includes a wheel hub connection disk 17, a wheel hub frame 18, and a wheel hub ring 19. The output shaft 10 is screwed and fixed to the wheel hub connection disk 17 in the wheel hub 2, and the direction of rotation of the output shaft 10 is opposite to the forward rotation direction of the wheel hub 2. In this way, the transmission between the output shaft 10 and the wheel hub 2 is more tightly secured, and there will be no loosening or falling off. At the same time, a fixing step 20 is provided on the output shaft 10, which is fixedly abutted against the wheel hub connection disk 17, which also plays a role in tightening the connection and positioning.

[0022] Furthermore, a dustproof seal ring 22 is provided between the wheel axle 4 and the rear mounting cover 13, and corresponding positioning bosses 23 and positioning grooves 24 are also provided between the wheel axle 4 and the rear mounting cover 13; a brake disc 21 corresponding to the hub connecting disc 17 is installed on the wheel axle 4, and a brake cavity 25 is formed between the hub connecting disc 17 and the brake disc 21, and the brake disc 21 is fixedly installed on the wheel axle 4, and the gap between the brake disc 21 and the output shaft 10, and the threaded connection between the output shaft 10 and the wheel hub connecting disc 17 are all correspondingly located in the formed brake cavity 25. The connection design has a better dustproof effect on the transmission mounting cavity 6.

[0023] The above is a detailed introduction to a transmission lubrication structure for an electric vehicle provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions disclosed by the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

1. A transmission lubrication structure for an electric vehicle, comprising a frame (1), a wheel hub (2), a motor (3), and a wheel axle (4); characterized in that: A transmission mounting end cover (5) is provided at the end of the housing (3-1) of the motor (3), a transmission mounting chamber (6) is provided in the transmission mounting end cover (5), a transmission assembly is provided in the transmission mounting chamber (6), the transmission assembly comprises a gear ring (7) and a power output shaft disc (8), the gear ring (7) is fixedly connected to the power output shaft disc (8), the end of the rotating shaft (3-3) of the motor (3) is meshed with the gear ring (7) for transmission, and the power output shaft disc (8) is fixedly connected to the wheel hub (2); the wheel shaft (4) passes through the transmission mounting end cover (5) and the power output shaft disc (8) for connection, the wheel shaft (4) can rotate relative to the transmission mounting end cover (5) and the power output shaft disc (8), and the motor (3) is fixedly connected to the vehicle frame (1) through the rear end cover (3-2) of the motor (3); the transmission mounting chamber (6) is a sealed chamber filled with lubricating oil, and the gear ring (7) and the power output shaft disc (8) are partially located in the lubricating oil in the transmission mounting chamber (6).

2. The transmission lubrication structure for electric vehicles according to claim 1, characterized in that: The power output shaft disc (8) comprises a mounting disc (9) and an output shaft (10); the output shaft (10) is rotatably connected to the wheel axle (4) and the transmission mounting end cover (5) via a bearing (11); the gear ring (7) is fixed in the mounting disc (9); the gear ring (7) and the mounting disc (9) are partially in the lubricating oil in the transmission mounting cavity (6); and the output shaft (10) is fixedly connected to the wheel hub (2).

3. A transmission lubrication structure for an electric vehicle according to claim 1 or 2, characterized in that: The transmission installation end cover (5) comprises a front installation cover (12) and a rear installation cover (13); the front installation cover (12) and the rear installation cover (13) are sealed and fixedly connected to form a transmission installation cavity (6); and the wheel axle (4) passes through the front installation cover (12) and the rear installation cover (13) for connection.

4. The transmission lubrication structure for electric vehicles according to claim 3, characterized in that: A positioning device (14) is provided between the front mounting cover (12) and the rear mounting cover (13), and the positioning device (14) can form a side rolling abutment with the mounting plate (9).

5. The transmission lubrication structure for electric vehicles according to claim 3, characterized in that: The rear mounting cover (13) and the housing (3-1) of the motor (3) are an integral structure, and the front mounting cover (12) is fixedly connected to the rear mounting cover (13) by means of bolts.

6. The transmission lubrication structure for electric vehicles according to claim 4, characterized in that: The positioning device (14) comprises a mounting rod (15) and a positioning bearing (16). Both ends of the mounting rod (15) are fixedly mounted on the front mounting cover (12) and the rear mounting cover (13). The positioning bearing (16) is mounted on the mounting rod (15). The positioning bearing (16) can form a side rolling abutment with the mounting plate (9).

7. The transmission lubrication structure for electric vehicles according to claim 2, characterized in that: The output shaft (10) and the wheel hub (2) are screwed together and fixed together, and the direction of rotation of the output shaft (10) is opposite to the forward rotation direction of the wheel hub (2).

8. The transmission lubrication structure for electric vehicles according to claim 2, characterized in that: The wheel hub (2) comprises a wheel hub connecting disk (17), a wheel hub frame (18), and a wheel hub ring (19); the output shaft (10) is screwed and fixed to the wheel hub connecting disk (17) in the wheel hub (2); a fixing step (20) is provided on the output shaft (10) and is fixedly abutted against the wheel hub connecting disk (17); and a brake disk (21) corresponding to the wheel hub connecting disk (17) is installed on the wheel axle (4).

9. The transmission lubrication structure for electric vehicles according to claim 3, characterized in that: A dustproof sealing ring (22) is provided between the wheel axle (4) and the rear mounting cover (13), and corresponding positioning bosses (23) and positioning grooves (24) are also provided between the wheel axle (4) and the rear mounting cover (13).

10. The transmission lubrication structure for electric vehicles according to claim 8, characterized in that: The hub connecting plate (17) and the brake disc (21) correspond to form a brake cavity (25), the brake disc (21) and the wheel axle (4) are fixedly mounted, and the gap between the brake disc (21) and the output shaft (10), as well as the threaded connection between the output shaft (10) and the hub connecting plate (17) are all correspondingly located in the formed brake cavity (25).

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