Electric vehicle motor protection device

Abstract

The utility model discloses a motor protection device for an electric vehicle, which comprises a motor end cover, a flywheel, an oil seal and a motor shaft, and is characterized in that the flywheel is coaxially and fixedly connected to the outer side of the motor end cover, the motor shaft is arranged in the center of the motor end cover in a penetrating manner through a bearing, the oil seal is arranged between the flywheel and the motor shaft, and the flywheel is fixedly connected to the flywheel. A dustproof cover is further arranged on the outer side of the flywheel, the dustproof cover is arranged on the motor shaft in a penetrating mode and covers the oil seal, two layers of annular check rings are arranged on the inner side of the dustproof cover and used for preventing dust and water, and the outer side of the dustproof cover is fixed through a bottom fork plate and prevented from falling off from the motor shaft. The dustproof cover completely wraps the oil seal, the oil seal is prevented from being directly exposed outside, the two layers of annular check rings are arranged from outside to inside, dust and splashed water can be effectively prevented from entering the oil seal, the oil seal is prevented from aging, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle motors, and in particular to a protective device for electric vehicle motors. Background Art

[0002] At present, the market usage of electric bicycles is relatively large, and users have higher and higher requirements for product quality. The motor is the most core component of electric vehicles and also has the highest cost. During the driving of electric vehicles, the wheel hub and the motor shaft will form relative rotation. The waterproof sealing performance between the flywheel on the wheel hub and the motor shaft directly affects the safety, operability, reliability and life cycle of the electric vehicle. Therefore, an oil seal is required between the two as a waterproof sealing structure. From the analysis of market returns, the failure rate caused by water ingress into the motor is the highest, and water is most likely to enter the motor from the oil seal that has aged, worn and failed. The existing oil seal structure is directly exposed to the outside because it has no protection, which makes the oil seal easily eroded by dust and sewage for a long time and aged, worn and failed, thus causing a chain reaction that leads to an increase in the motor failure rate. Utility Model Content

[0003] The utility model aims to provide a motor protection device for an electric vehicle in view of the defects of the prior art.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A motor protection device for an electric vehicle comprises a motor end cover, a flywheel, an oil seal and a motor shaft, wherein the flywheel is coaxially fixedly connected to the outer side of the motor end cover, the motor shaft is passed through the center of the motor end cover through a bearing, the oil seal is arranged between the flywheel and the motor shaft, a dust cover is also arranged on the outer side of the flywheel, the dust cover is passed through the motor shaft and covers the oil seal, two layers of annular retaining rings are arranged on the inner side of the dust cover for dust and water prevention, and the outer side of the dust cover is fixed by a flat fork plate to prevent it from falling off the motor shaft.

[0006] Furthermore, a metal gasket is arranged between the flat fork plate and the dust cover, the outer surface of the dust cover is provided with a first step, a second step, and a positioning column, the metal gasket is provided with a positioning hole and an axle hole, the metal gasket is clamped between the first step and the second step, the positioning column is passed through the positioning hole, and the motor shaft is passed through the axle hole.

[0007] Furthermore, the metal gasket is provided with a first screw hole, and the dust cover is provided with a second screw hole, and the first screw hole and the second screw hole are connected by screws to fix the metal gasket and the dust cover.

[0008] Furthermore, a wire outlet is provided on the side of the dust cover, and the wire outlet end of the motor shaft is inserted into the wire outlet.

[0009] Compared with the prior art, the beneficial effects of the utility model are: 1. The dust cover fully wraps the oil seal to prevent the oil seal from being directly exposed to the outside, and two layers of annular retaining rings are arranged from the outside to the inside, which can effectively prevent dust and splashing water from entering the oil seal, prevent the oil seal from aging, and extend the service life. 2. While being waterproof and dustproof, it can also prevent the chain from wearing the motor wiring harness after the chain falls off, causing the motor wire to be damaged and water to enter. 3. The wire outlet on the side of the dust cover can protect the motor outlet from being easily damaged. 4. The flat fork plate and the metal gasket can fix the position of the dust cover from both the axial and circumferential directions to prevent the dust cover from falling off and displacement during the driving of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0011] Figure 2 This is an exploded view of the structure of an embodiment of the utility model;

[0012] Figure 3 This is a cross-sectional view of an embodiment of the utility model;

[0013] Figure 4 This is a schematic diagram of the front structure of the dust cover of the utility model embodiment;

[0014] Figure 5 This is a schematic diagram of the back structure of the dust cover of the utility model embodiment;

[0015] Figure 6 This is a schematic diagram of the metal gasket structure of an embodiment of the utility model;

[0016] Figure 7 This is a schematic diagram of the installation structure of the dust cover and the metal gasket according to an embodiment of the utility model.

[0017] Among them: 1-motor end cover, 2-flywheel, 3-oil seal, 4-motor shaft, 5-bearing, 6-dust cover, 7-annular retaining ring, 8-flat fork plate, 9-metal gasket, 10-first step, 11-second step, 12-positioning column, 13-positioning hole, 14-through-shaft hole, 15-first screw hole, 16-second screw hole, 17-outlet, 18-outlet terminal. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 present invention.

[0020] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Figure 1-7 The specific embodiment of a motor protection device for an electric vehicle is shown, comprising a motor end cover 1, a flywheel 2, an oil seal 3, and a motor shaft 4. The flywheel 2 is coaxially fixedly connected to the outside of the motor end cover 1. The motor shaft 4 is passed through the center of the motor end cover 1 through a bearing 5. The oil seal 3 is arranged between the flywheel 2 and the motor shaft 4. A dust cover 6 is also arranged on the outside of the flywheel 2. The dust cover 6 passes through the motor shaft 4 and covers the oil seal 3. Two layers of annular retaining rings 7 are arranged on the inside of the dust cover 6 for dust and water prevention. The outside of the dust cover 6 is fixed by a flat fork plate 8 to prevent it from falling off the motor shaft 4. The dust cover 6 fully wraps the oil seal 3 to prevent the oil seal 3 from being directly exposed to the outside, and two layers of annular retaining rings 7 are arranged from the outside to the inside, which can effectively prevent dust and splashing water from entering the oil seal 3, prevent the oil seal 3 from aging, and extend the service life.

[0023] A metal gasket 9 is arranged between the flat fork plate 8 and the dust cover 6. The outer surface of the dust cover 6 is provided with a first step 10, a second step 11, and a positioning column 12. The metal gasket 9 is provided with a positioning hole 13 and an axle hole 14. The metal gasket 9 is clamped between the first step 10 and the second step 11, and the positioning column 12 is inserted in the positioning hole 13. Such an arrangement can ensure that the metal gasket 9 and the dust cover 6 are relatively fixed. At the same time, the motor shaft 4 is inserted in the axle hole 14, and the motor shaft 4 and the axle hole 14 can form a circumferential fixation, so that the dust cover 6 and the motor shaft 4 are circumferentially fixed, so as to prevent the dust cover 6 from rotating with the operation of the motor. A first screw hole 15 is arranged on the metal gasket 9, and a second screw hole 16 is arranged on the dust cover 6. The first screw hole 15 and the second screw hole 16 are connected by screws to fix the metal gasket 9 and the dust cover 6. The flat fork plate 8 and the metal gasket 9 can fix the position of the dust cover 6 from both the axial direction and the circumferential direction, thereby preventing the dust cover 6 from falling off and shifting during the driving of the electric vehicle.

[0024] A wire outlet 17 is provided on the side of the dust cover 6, and a wire outlet 18 of the motor shaft 4 is passed through the wire outlet 17, so as to protect the wire outlet 18 from being easily damaged.

[0025] The above specific implementation methods are only for illustrating the technical concept and structural features of the utility model, and the purpose is to enable relevant persons familiar with this technology to implement them accordingly. However, the above content does not limit the protection scope of the utility model. Any equivalent changes or modifications made based on the spirit of the utility model should fall within the protection scope of the utility model.

Claims

1. A motor protection device for an electric vehicle, comprising a motor end cover (1), a flywheel (2), an oil seal (3), and a motor shaft (4), characterized in that: The flywheel (2) is coaxially fixedly connected to the outer side of the motor end cover (1); the motor shaft (4) is passed through the center of the motor end cover (1) via a bearing (5); the oil seal (3) is arranged between the flywheel (2) and the motor shaft (4); a dust cover (6) is also arranged on the outer side of the flywheel (2); the dust cover (6) is passed through the motor shaft (4) and covers the oil seal (3); two layers of annular retaining rings (7) are arranged on the inner side of the dust cover (6) for dustproof and waterproofing; the outer side of the dust cover (6) is fixed by a flat fork plate (8) to prevent it from falling off the motor shaft (4).

2. The electric vehicle motor protection device according to claim 1, characterized in that: A metal gasket (9) is arranged between the flat fork plate (8) and the dust cover (6); the outer surface of the dust cover (6) is provided with a first step (10), a second step (11), and a positioning column (12); a positioning hole (13) and an axle hole (14) are arranged on the metal gasket (9); the metal gasket (9) is clamped between the first step (10) and the second step (11); the positioning column (12) is inserted into the positioning hole (13); and the motor shaft (4) is inserted into the axle hole (14).

3. The electric vehicle motor protection device according to claim 2, characterized in that: The metal gasket (9) is provided with a first screw hole (15), and the dust cover (6) is provided with a second screw hole (16); the first screw hole (15) and the second screw hole (16) are connected by screws to fix the metal gasket (9) and the dust cover (6).

4. The electric vehicle motor protection device according to claim 1, characterized in that: A wire outlet (17) is provided on the side of the dust cover (6), and a wire outlet end (18) of the motor shaft (4) is inserted into the wire outlet (17).

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