Wire outlet sealing structure of in-wheel motor

Abstract

The utility model relates to a sealing structure of outgoing line of in -wheel motor, including the outgoing line sleeve of the motor shaft, a plurality of outgoing line holes for leading outgoing line are made on the outgoing line sleeve, a plurality of O type rings are sleeved on the outgoing line, the hole wall of outgoing line hole is made with first recess, all O type rings are located in first recess, O type ring seals between outgoing line and outgoing line sleeve, the bushing is still sleeved on outgoing line, bushing is located in first recess and axially extrudes O type ring, O type ring radial expansion and tightly stick outgoing line outer wall and outgoing line hole inner wall, outgoing line sleeve side surface is equipped with the line pressing plate, and line pressing plate axially extrudes bushing. The utility model integrates outgoing line sealing structure on outgoing line sleeve, and outgoing line sealing structure is convenient for installation, overhaul and replacement, reduces the cost of sealing, and the sealing property is good, guarantees the reliability of sealing.

Description

Technical Field

[0001] This utility model relates to the cable sealing structure of a hub motor, and belongs to the field of hub motor technology. Background Technology

[0002] The hub motor is a core component of the electric vehicle drive system. Existing hub motors have lead holes machined into the motor shaft for the motor leads, which are primarily used to connect the hub motor to the power supply and control circuitry. Hub motors are susceptible to water ingress under harsh operating conditions such as wind, sun, and rain, leading to motor malfunction or failure. Rainwater can easily enter the hub motor through the gap between the lead and the wall of the lead hole. Currently, the conventional approach to address this issue is to seal the gap between the lead and the lead hole wall with adhesive. This process is complex, and the cost of the sealant is relatively high. Furthermore, hub motors generate a significant amount of heat during operation, creating a high-temperature environment that causes the sealant to age prematurely. After a period of use, the sealant will fail, severely impacting the sealing performance between the lead and the motor shaft. Moreover, because the sealant is directly applied inside the lead hole within the motor shaft, repair and replacement of the sealant are impossible, allowing water ingress to continue causing motor malfunction or failure. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a hub motor cable sealing structure that offers good sealing performance and reduces sealing costs.

[0004] To achieve this objective, the technical solution adopted by this utility model is:

[0005] The hub motor's cable outlet sealing structure includes a cable outlet sleeve fitted on the motor shaft. The cable outlet sleeve has several cable outlet holes through which the cable leads out. Several O-rings are fitted on the cable leads. A first groove is formed on the wall of the cable outlet hole. All the O-rings are located in the first groove. The O-rings seal the cable leads and the cable outlet sleeve.

[0006] As a further optimization of the above technical solution: a bushing is also provided on the lead wire, the bushing is located in the first groove and axially presses the O-ring, the O-ring expands radially and fits tightly against the outer wall of the lead wire and the inner wall of the outlet hole.

[0007] As a further optimization of the above technical solution: a pressure plate is installed on the side of the outlet sleeve, and the pressure plate axially presses the bushing.

[0008] As a further optimization of the above technical solution: the first groove is located at the end of the wire outlet hole away from the inside of the motor, and the second groove is formed at the end of the wire outlet hole closer to the inside of the motor.

[0009] As a further optimization of the above technical solution, it also includes a motor end cover, which is sleeved on the outlet sleeve, and an oil seal and a bearing are provided between the inner circumferential surface of the motor end cover and the outer circumferential surface of the outlet sleeve.

[0010] As a further optimization of the above technical solution, the cable outlet sleeve is also equipped with a waterproof and breathable valve.

[0011] Compared with existing technologies, this utility model achieves the lead wire exit through a lead wire sleeve fitted on the motor shaft, avoiding the need to machine lead wire holes on the motor shaft, ensuring the sealing of the motor shaft itself. Simultaneously, the lead wire sealing structure is integrated into the lead wire sleeve, facilitating the installation, maintenance, and replacement of the sealing structure, reducing sealing costs, and ensuring good sealing performance and reliability. Inside the lead wire sleeve, a pressure plate and bushing compress the O-ring, causing radial expansion and ensuring the O-ring always fits tightly against the outer wall of the lead wire and the inner wall of the lead wire hole, ensuring high sealing performance, preventing water ingress, and ensuring normal motor operation. All O-rings are stacked to form a multi-ring sealing structure, preventing the sealing effect from being affected by the aging of a single O-ring. The lead wire sleeve is also equipped with a waterproof and breathable valve. This valve allows the motor to expand due to internal pressure rise when it heats up during operation and decreases in pressure when it cools down, creating a breathing effect for pressure balance and preventing water vapor from flowing back into the motor. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0013] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0014] Figure 3 This is a cross-sectional structural diagram of the present invention located inside the hub motor. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-3 As shown, the hub motor's cable exit sealing structure includes a cable exit sleeve 1 fitted onto the motor shaft 7. The cable exit sleeve 1 has several cable exit holes 11 through which the lead wires 5 exit. Several O-rings 2 are fitted onto the lead wires 5. A first groove 12 is formed on the wall of each cable exit hole 11, and all O-rings 2 are located within the first groove 12. The O-rings 2 seal the connection between the lead wires 5 and the cable exit sleeve 1. Multiple O-rings 2 are provided, and all O-rings 2 are stacked to form a multi-ring sealing structure.

[0016] In the above technical solution: a bushing 3 is also fitted on the lead wire 5. The bushing 3 is located in the first groove 12 and axially presses the O-ring 2. The O-ring 2 expands radially and ensures that the O-ring 2 is always tightly attached to the outer wall of the lead wire 5 and the inner wall of the outlet hole 11, achieving high sealing performance. The bushing 3 can be made of metal or non-metal. A pressure plate 4 is installed on the side of the outlet sleeve 1, and the pressure plate 4 axially presses the bushing 3.

[0017] In the above technical solution: the first groove 12 is located at the end of the cable outlet 11 away from the inside of the motor. The end of the cable outlet 11 near the inside of the motor has a second groove 13. The second groove 13 facilitates the threading of the lead wire 5 and reduces the weight of the cable outlet sleeve 1, thus meeting the lightweight design requirements of the hub motor.

[0018] The above technical solution also includes a motor end cover 8, such as... Figure 3 As shown, the motor end cover 8 is fitted onto the cable outlet sleeve 1. An oil seal 9 and a bearing 10 are provided between the inner circumferential surface of the motor end cover 8 and the outer circumferential surface of the cable outlet sleeve 1. When it is necessary to repair or replace the O-ring 2, first remove the motor end cover 8 from the hub, then detach the cable outlet sleeve 1 from the motor shaft 7, remove the pressure plate 4, take out the bushing 3, and repair or replace the O-ring 2.

[0019] In the above technical solution, the outlet sleeve 1 is also equipped with a waterproof and breathable valve 6. The waterproof and breathable valve 6 is formed by combining a waterproof and breathable membrane with other materials such as plastic, metal, and silicone through injection molding, ultrasonic welding, etc., to create a sealable installation component. The waterproof and breathable valve 6 can be directly purchased from the market. The waterproof and breathable valve 6 causes the motor to expand due to increased internal pressure when it heats up during operation, and decreases the pressure when it cools down, thus creating a breathing effect to balance the air pressure and prevent water vapor from flowing back into the motor.

[0020] This invention utilizes a lead-out sleeve 1 fitted onto the motor shaft 7 to allow the lead-out wire 5 to exit, avoiding the need to machine a lead-out hole on the motor shaft 7 and ensuring the sealing performance of the motor shaft 7 itself. Simultaneously, the lead-out wire sealing structure is integrated into the lead-out sleeve 1, facilitating the installation, maintenance, and replacement of the sealing structure, reducing sealing costs, and ensuring good sealing performance and reliability. Inside the lead-out sleeve 1, the O-ring 2 is compressed by the pressure plate 4 and the bushing 3, causing radial expansion and ensuring that the O-ring 2 always fits tightly against the outer wall of the lead-out wire 5 and the inner wall of the lead-out hole 11, ensuring high sealing performance, preventing water ingress, and ensuring normal motor operation. All O-rings 2 are stacked to form a multi-ring sealing structure, preventing the sealing effect from being affected by the aging of a single O-ring 2. The lead-out sleeve 1 is also equipped with a waterproof and breathable valve 6. The waterproof and breathable valve 6 allows the motor to expand due to internal pressure rise when it heats up during operation and decreases in pressure when it cools down, creating a breathing effect for pressure balance and preventing water vapor from flowing back into the motor.

[0021] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of this utility model.

Claims

1. A sealing structure for the output cable of a hub motor, characterized in that... The device includes a wire outlet sleeve (1) fitted onto the motor shaft (7). The wire outlet sleeve (1) has several wire outlet holes (11) through which the lead wire (5) is led out. Several O-rings (2) are fitted onto the lead wire (5). A first groove (12) is formed on the wall of the wire outlet hole (11). All the O-rings (2) are located in the first groove (12). The O-rings (2) seal the lead wire (5) and the wire outlet sleeve (1).

2. The hub motor cable sealing structure according to claim 1, characterized in that... A bushing (3) is also fitted on the lead wire (5). The bushing (3) is located in the first groove (12) and axially presses the O-ring (2). The O-ring (2) expands radially and fits tightly against the outer wall of the lead wire (5) and the inner wall of the outlet hole (11).

3. The hub motor cable sealing structure according to claim 2, characterized in that... A pressure plate (4) is installed on the side of the outlet sleeve (1), and the pressure plate (4) axially presses the bushing (3).

4. The hub motor cable sealing structure according to claim 1, characterized in that... The first groove (12) is located at the end of the wire outlet (11) away from the inside of the motor, and the second groove (13) is formed at the end of the wire outlet (11) close to the inside of the motor.

5. The hub motor cable sealing structure according to claim 1, characterized in that... It also includes a motor end cover (8), which is sleeved on the outlet sleeve (1). An oil seal (9) and a bearing (10) are provided between the inner circumferential surface of the motor end cover (8) and the outer circumferential surface of the outlet sleeve (1).

6. The hub motor cable sealing structure according to claim 1, characterized in that... The cable outlet sleeve (1) is also equipped with a waterproof and breathable valve (6).

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