Sealing waterproof structure for motor of electric vehicle

Abstract

The utility model relates to the electric vehicle motor sealing waterproof technical field, and discloses an electric vehicle motor sealing waterproof structure comprising a motor end cover and a motor shaft, the motor end cover is internally provided with a sealing member mounting hole, the sealing member mounting hole is internally provided with a rectangular pressure spring and an end cover ceramic rubber coating assembly, and the end cover ceramic rubber coating assembly is provided with a sealing member. A shaft ceramic rubber coating assembly, a pressing cover and a clamp spring are mounted on the motor shaft, and the end cover ceramic rubber coating assembly and the shaft ceramic rubber coating assembly are both composed of wear-resistant ceramic chips and outer side rubber coating. Compared with an original plastic oil seal, the high-smoothness wear-resistant and high-temperature-resistant composite ceramic plate is adopted, the smoothness of the friction contact surface of the ceramic plate is Ra0.1, the friction resistance is smaller, and the wear resistance is enhanced; and the ceramic material and the plastic rubber coating material can bear larger friction force and do not slip when the motor rotates.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle motor sealing and waterproofing, and more specifically to an electric vehicle motor sealing and waterproofing structure. Background Art

[0002] The current conventional waterproofing solutions for electric vehicles in the market are mainly plastic oil seal structures. Since conventional oil seals are made of plastic materials, during the long-term use of the motor, the following problems exist: 1. Poor wear resistance (easy to wear during use, resulting in seal failure on the shaft); 2. Poor high-temperature resistance (the high temperature during the operation of a conventional motor will accelerate the aging and deformation of the oil seal, ultimately leading to seal failure); 3. Poor corrosion resistance (in a corrosive environment such as rainwater, it will accelerate the aging and deformation of the oil seal, ultimately leading to seal failure); 4. Short service life (the sealing effect decreases after the plastic product ages, and it needs to be replaced regularly).

[0003] Currently, there is a solution in the market that combines ceramic chips with ink materials to replace traditional oil seals. However, this solution still has the following problems: 1. The ceramic chips and ink materials are in a general interference fit with the externally wrapped sealing ring. During the rotation of the motor, the sealing ring needs to bear the radial interference fit friction force and the axial rotational friction force when the ceramic chips and ink materials rub against each other. When the friction force between the sealing ring and the ceramic and ink materials is too large, there is a risk of slipping and damage to the sealing ring; 2. The hardness of the ink material is lower than that of the ceramic material, and there will be wear after long-term friction. When the ink material wears, there is a risk of motor seal failure; 3. After the ceramic chips and ink materials are installed, there is a lack of axial pressing force. The sealing ring at the motor end cover and the sealing ring on the motor shaft are directly positioned by radial interference fit, and there is a risk of axial movement, ultimately leading to seal failure. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides an electric vehicle motor sealing and waterproofing structure to solve the problems existing in the above background art.

[0005] The utility model provides the following technical solution: an electric vehicle motor sealing and waterproofing structure, including a motor end cover and a motor shaft. A seal installation hole is provided in the motor end cover, and a rectangular compression spring and an end cover ceramic rubber-coated assembly are installed in the seal installation hole. An axle ceramic rubber-coated assembly, a pressing cover, and a snap ring are installed on the motor shaft. Both the end cover ceramic rubber-coated assembly and the axle ceramic rubber-coated assembly are composed of wear-resistant ceramic chips and an outer rubber coating.

[0006] As a further solution of the utility model, the surface of the wear-resistant ceramic chip is a polished high-gloss ceramic smooth surface.

[0007] As a further solution of the present utility model, the ceramic smooth surface of the shaft ceramic rubber-coated assembly is in contact friction with the ceramic smooth surface of the end cover ceramic rubber-coated assembly.

[0008] As a further solution of the present utility model, the shaft ceramic rubber-coated assembly is in interference fit with the outer ring of the shaft sleeve through the plastic anti-detachment corrugations on the inner ring.

[0009] As a further solution of the present utility model, the top plane of the rectangular compression spring is in close contact with the end cover ceramic rubber-coated assembly. The outer ring of the end cover ceramic rubber-coated assembly is in a plastic corrugated anti-detachment shape and is pressed into the seal installation hole by means of interference fit with the inner wall of the seal installation hole.

[0010] As a further solution of the present utility model, the inner walls of the rectangular compression spring and the end cover ceramic rubber-coated assembly do not contact the outer ring of the shaft sleeve and there is a certain gap.

[0011] Technical effects and advantages of the present utility model:

[0012] 1. By adopting the high-gloss wear-resistant and high-temperature-resistant composite ceramic sheet, compared with the original plastic material oil seal, the surface finish of the friction contact surface of the ceramic sheet is Ra0.1, the friction resistance is smaller and the wear resistance is enhanced.

[0013] 2. The ceramic material and the external plastic material are connected by injection molding and rubber coating, so that the ceramic material and the plastic rubber-coated material can withstand greater frictional force without slipping during the rotation of the motor.

[0014] 3. A rectangular compression spring is added inside the hub cover to support the two ceramic sheets in close fit. Even if there is a small amount of wear on the ceramic sheets or there is axial movement of the ceramic sheets, the seal will not fail due to an increase in the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the present utility model.

[0016] Figure 2 is the Figure 1 cross-sectional view of the present utility model.

[0017] Figure 3 is the partial enlarged structural schematic diagram of the present utility model at the motor hub brake end.

[0018] Figure 4 is the three-dimensional exploded structural schematic diagram of the present utility model.

[0019] Figure 5 is the Figure 4 cross-sectional view of the present utility model.

[0020] Figure 6This is a partially enlarged structural schematic diagram of the present utility model at the motor lead-out end.

[0021] The reference numerals are: 101, motor end cover; 102, seal mounting hole; 201, motor shaft; 301, rectangular compression spring; 401, end cover ceramic rubberized assembly; 402, wear-resistant ceramic sheet; 501, shaft ceramic rubberized assembly; 601, pressing cover; 701, snap ring. Detailed implementation manners

[0022] Next, the technical solutions in the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Additionally, the forms of each structure described in the following implementation manners are merely examples, and the present utility model is not limited to the structures described in the following implementation manners. All other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0023] Referring to Figures 1-5 , the present utility model provides an electric vehicle motor sealing and waterproof structure, including that the motor end cover 101 contains a seal mounting hole 102, and a rectangular compression spring 301 and an end cover ceramic rubberized assembly 401 are installed in 102; 201 in the figure is the motor shaft, and a shaft ceramic rubberized assembly 501, a pressing cover 601 and a snap ring 701 are installed on 201. The rectangular compression spring 301 is placed on the card slot of the seal mounting hole 102; the top plane of the rectangular compression spring 301 is in close contact with the end cover ceramic rubberized assembly 401; the outer ring of the end cover ceramic rubberized assembly 401 is a plastic corrugated anti-disengagement shape and is pressed into the hole of 102 by an interference fit with the inner wall of the seal mounting hole 102. The inner walls of the rectangular compression spring 301 and the end cover ceramic rubberized assembly 401 do not contact the outer surface of the motor shaft 201 and there is a certain gap.

[0024] In the present utility model, the end cover ceramic rubberized assembly 401 is composed of a wear-resistant ceramic sheet 402 and an outer rubber coating, and the shaft ceramic rubberized assembly 501 is composed of a wear-resistant ceramic sheet 402 and an outer rubber coating. The surface of the wear-resistant ceramic sheet 402 is a polished high-gloss ceramic smooth surface.

[0025] In the present utility model, the shaft ceramic rubberized assembly 501 is in interference fit with the outer ring of 202 through the plastic anti-disengagement corrugation on the inner ring; at the same time, the ceramic smooth surface of the shaft ceramic rubberized assembly 501 is in contact friction with the ceramic smooth surface of the end cover ceramic rubberized assembly 401; a pressing cover 601 is installed above the shaft ceramic rubberized assembly 501, and a snap ring 701 is fixed above 601. The 701 is installed in the snap ring groove of the motor shaft 201.

[0026] In the present utility model, on the premise that the structure of the current wear-resistant ceramic sheet remains unchanged, the ceramic material can be replaced with other types of wear-resistant and high-temperature-resistant materials, and the current structure is not limited to ceramic materials only.

[0027] In the present utility model, the ceramic waterproof structure is applicable to the waterproofing of the end-cover wire outlet at both ends of the motor shaft, including the motor hub brake end and the motor wire outlet end.

[0028] The working principle of the present utility model: When installing the rectangular compression spring 301, it is necessary to press the end-cover ceramic encapsulation assembly 401 from above into the inner wall of the seal installation hole 102. At this time, the rectangular compression spring 301 is in a state of being compressed under force. By installing a snap ring 701 on the shaft, it is ensured that the shaft ceramic encapsulation assembly 501 and the end-cover ceramic encapsulation assembly 401 are closely attached under the thrust of the rectangular spring 301 and the limiting resistance of the snap ring 701. When the motor rotates, the rotor part rotates while the stator part remains stationary. At this time, the end-cover ceramic encapsulation assembly 401 and the rectangular compression spring 301 on the rotor motor end-cover 101 rotate synchronously with the rotor end-cover, while the motor shaft 201 of the stator part and the shaft ceramic encapsulation assembly 501, the pressing cover 601, and the snap ring 701 installed on the shaft 201 all remain stationary with the shaft. At this time, the smooth ceramic surfaces between the shaft ceramic encapsulation assembly 501 and the end-cover ceramic encapsulation assembly 401 are in frictional contact. At this time, when the outside of the motor is waded through water, the water cannot pass through the smooth surface of the contact between the shaft ceramic encapsulation assembly 501 and the end-cover ceramic encapsulation assembly 401 and enter the interior of the motor. Similarly, the coolant inside the motor cannot flow out of the motor.

[0029] Finally, several points should be noted: In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. The terms "up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change.

[0030] In the attached drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments of the present disclosure are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

Claims

1. An electric vehicle motor sealing and waterproof structure, comprising a motor end cover (101) and a motor shaft (201), characterized in that: A seal installation hole (102) is provided in the motor end cover (101). A rectangular compression spring (301) and an end cover ceramic rubberized assembly (401) are installed in the seal installation hole (102). A shaft ceramic rubberized assembly (501), a pressing cover (601), and a snap ring (701) are installed on the motor shaft (201). Both the end cover ceramic rubberized assembly (401) and the shaft ceramic rubberized assembly (501) are composed of wear-resistant ceramic sheets (402) and outer rubber coatings.

2. The sealed waterproof structure of an electric vehicle motor according to claim 1, characterized in that: The surface of the wear-resistant ceramic sheet (402) is a polished high-surface-finish ceramic smooth surface.

3. The sealed waterproof structure of an electric vehicle motor according to claim 1, characterized in that: The ceramic smooth surface of the shaft ceramic rubberized assembly (501) is in contact friction with the ceramic smooth surface of the end cover ceramic rubberized assembly (401).

4. A motor sealing and waterproof structure for an electric vehicle according to claim 1, characterized in that: The shaft ceramic rubberized assembly (501) is in interference fit with the outer surface of the motor shaft (201) through the plastic anti-loosening corrugations on the inner ring.

5. The sealed waterproof structure of an electric vehicle motor according to claim 1, wherein: The top plane of the rectangular compression spring (301) is in close contact with the end cover ceramic rubberized assembly (401). The outer ring of the end cover ceramic rubberized assembly (401) is in a plastic corrugation anti-loosening shape and is pressed into the hole of the seal installation hole (102) by means of interference fit with the inner wall of the seal installation hole (102).

6. The sealed waterproof structure of an electric vehicle motor according to claim 1, wherein: The inner walls of the rectangular compression spring (301) and the end cover ceramic rubberized assembly (401) do not contact the outer surface of the motor shaft (201), and there is a certain gap.

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