A motor output shaft sealing device

Abstract

The utility model discloses a motor output shaft sealing device, it includes framework and elastomer, and framework and elastomer are all annular structure, and the elastomer includes base body and sealing part, sealing part includes dustproof lip, sealing lip and grease sealing lip who sets up the interval along the first horizontal direction, and dustproof lip is close to air side setting, and grease sealing lip is close to sealing side setting, and sealing lip sets up between dustproof lip and grease sealing lip, after motor output shaft sealing device is encased in the default position of motor output shaft, and the clearance for forming the labyrinth seal structure between dustproof lip and motor output shaft has, and sealing lip and motor output shaft interference fit, and grease sealing lip and motor output shaft interference fit, and the outer periphery of motor output shaft, sealing lip and grease sealing lip enclose the receiving space for containing the grease. The motor output shaft sealing device adopts three sealing combination design, and the dust, mud water is met while greatly reducing the wear and tear of sealing lip, and the service life is long.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing device for the output shaft of a motor. Background Technology

[0002] When the drive motor of a new energy vehicle transmits power to the reducer, a sealing device needs to be installed at the output shaft of the motor to prevent external dust and mud from entering the motor. The sealing device usually needs to meet the operating conditions such as dust prevention, dry running, and high speed.

[0003] Existing sealing devices typically include a skeleton and an elastomer, both of which are annular. The elastomer is integrally formed on the inner circumference of the skeleton. The elastomer includes a dust lip and a grease sealing lip. The dust lip is located near the outer side of the motor. After the sealing device is fitted onto the motor's drive shaft, the dust lip is press-fitted with the outer circumference of the motor's output shaft to prevent external dust and mud from entering the motor. The grease sealing lip is press-fitted with the outer circumference of the motor's output shaft to retain the grease in the storage space formed by the outer circumference of the motor's output shaft, the dust lip, and the grease sealing lip.

[0004] However, to ensure the dustproof effect of the dust lip, a tension spring is usually installed on the outer circumference of the dust lip. After prolonged use, the sealing performance of the dust lip with the tension spring will decrease due to long-term wear. In addition, when used in the motor seals of new energy vehicles, the higher speed (above 15,000 rpm) exacerbates the wear of the dust lip, and the high temperature of friction can even cause high-temperature deterioration of the rubber material, causing the sealing device to fail completely. Utility Model Content

[0005] The purpose of this invention is to provide a motor output shaft sealing device to solve the aforementioned problems of existing motor output shaft sealing devices.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model proposes a sealing device for a motor output shaft, which includes a skeleton and an elastic body, both of which are annular structures, wherein:

[0008] The elastomer includes a matrix and a sealing part. The matrix is ​​integrally formed on the inner circumferential side of the skeleton, and the sealing part is disposed on the inner circumferential side of the matrix. The first side of the matrix in the first horizontal direction is the air side, and the second side of the matrix in the first horizontal direction is the sealing side.

[0009] The sealing part includes a dustproof lip, a sealing lip and a grease sealing lip, which are spaced apart along a first horizontal direction. The dustproof lip is disposed near the air side, the grease sealing lip is disposed near the sealing side, and the sealing lip is disposed between the dustproof lip and the grease sealing lip.

[0010] After the motor output shaft sealing device is installed in the preset position of the motor output shaft, there is a gap between the dustproof lip and the motor output shaft to form a labyrinth seal structure. The sealing lip is interference-fitted with the motor output shaft, and the grease sealing lip is interference-fitted with the motor output shaft. The outer peripheral surface of the motor output shaft, the sealing lip, and the grease sealing lip form a storage space for accommodating lubricating grease.

[0011] Optionally, the dustproof lip includes a first lip waist, a first bevel, and a second bevel, wherein:

[0012] The first lip waist is annular, and the outer peripheral end of the first lip waist is an integral structure with the sealing lip. The inner peripheral end of the first lip waist extends toward the air side and is inclined near the center of the elastomer.

[0013] The first and second inclined surfaces are located at the inner periphery of the first lip waist. Both the first and second inclined surfaces are annular. The outer periphery of the first and second inclined surfaces intersect to form the first lip tip.

[0014] Optionally, the sealing lip includes a second lip waist, a third bevel, and a fourth bevel, wherein:

[0015] The second lip waist is annular, and the outer peripheral end of the second lip waist is an integral structure with the substrate. The inner peripheral end of the second lip waist extends toward the dustproof lip and is inclined near the center of the elastomer.

[0016] The third and fourth bevels are located at the inner circumferential ends of the second lip waist. Both the third and fourth bevels are annular, and the outer circumferential ends of the third and fourth bevels intersect to form the second lip tip.

[0017] Optionally, the grease-sealing lip includes a flexible portion, a third lip waist, a fifth bevel, and a sixth bevel, wherein:

[0018] The flexible part is annular, and the outer peripheral end of the flexible part is an integral structure with the base. The inner peripheral end of the flexible part is bent toward the sealing lip.

[0019] The third lip waist is annular, and the outer peripheral end of the third lip waist is an integral structure with the flexible part. The inner peripheral end of the third lip waist extends toward the sealing lip and is inclined near the center of the elastomer.

[0020] The fifth and sixth bevels are located at the inner periphery of the third lip waist. Both the fifth and sixth bevels are annular, and their outer periphery intersects to form the tip of the third lip.

[0021] Optionally, the length of the second lip waist is greater than the length of the first lip waist, and the width of the second lip waist is less than the width of the first lip waist.

[0022] Optionally, the first inclined plane is positioned relative to the second inclined plane on the air side, and the width of the first inclined plane is smaller than the width of the second inclined plane;

[0023] The third inclined plane is positioned relative to the fourth inclined plane on the air side, and the width of the third inclined plane is smaller than the width of the fourth inclined plane;

[0024] The fifth inclined plane is positioned relative to the sixth inclined plane on the air side, and the width of the fifth inclined plane is greater than the width of the sixth inclined plane.

[0025] Optionally, the inclination angle of the fifth inclined plane is smaller than that of the sixth inclined plane.

[0026] Optionally, the base and sealing parts are molded from rubber material using a mold.

[0027] Optionally, the cross-section of the skeleton is "L" shaped, and the elastomer completely or partially covers the skeleton.

[0028] Optionally, a first chamfer is provided at the edge of the outer peripheral end of the elastomer near the air side, and a second chamfer is provided at the edge of the outer peripheral end of the elastomer near the sealing side.

[0029] The motor output shaft sealing device provided by this utility model adopts a three-seal combination design. The outermost dustproof lip forms a labyrinth structure with a micro-gap between it and the motor output shaft, which initially blocks the intrusion of dust and mud. The sealing lip adopts a springless following design, which greatly reduces the wear of the sealing lip while satisfying the requirements of dust and mud prevention, and has a long service life. The grease sealing lip can store a large amount of grease, which can meet the requirements of dry running durability while blocking the high and low pressure differences in the cavity during motor use. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the motor output shaft sealing device provided in this embodiment of the utility model;

[0031] Figure 2 This is a partial structural diagram of the motor output shaft sealing device and its cooperation with the motor output shaft provided in this embodiment of the utility model.

[0032] Figure 1 and Figure 2 The following reference numerals are included:

[0033] Skeleton 10;

[0034] Elastomer 20: Matrix 21, sealing part 22, dustproof lip 23, first lip waist 230, first inclined surface 231, second inclined surface 232, first lip tip 233, sealing lip 24, second lip waist 240, third inclined surface 241, fourth inclined surface 242, second lip tip 243, grease sealing lip 25, flexible part 250, third lip waist 251, fifth inclined surface 252, sixth inclined surface 253, third lip tip 254, first chamfer 26, second chamfer 27;

[0035] Motor output shaft 30, clearance 31. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] When the drive motor of a new energy vehicle transmits power to the reducer, a sealing device needs to be installed at the output shaft of the motor to prevent external dust and mud from entering the motor. The sealing device usually needs to meet the operating conditions such as dust prevention, dry running, and high speed.

[0038] However, existing sealing devices typically incorporate a tension spring on the outer circumference of the dust lip to ensure its dustproof effect. Over time, the sealing performance of the dust lip with the tension spring deteriorates due to wear. Furthermore, in applications such as motor seals in new energy vehicles, the higher rotational speeds (above 15,000 rpm) exacerbate the wear of the dust lip, and the high temperatures from friction can even lead to high-temperature degradation of the rubber material, causing the sealing device to completely fail.

[0039] Therefore, this utility model proposes a sealing device for the output shaft of a motor. Please refer to [link / reference needed]. Figure 1 and Figure 2 As shown, the motor output shaft sealing device proposed in this embodiment of the present invention includes a frame 10 and an elastic body 20. Both the frame 10 and the elastic body 20 are annular structures. The elastic body 20 includes a base 21 and a sealing part 22. The base 21 is integrally formed on the inner circumferential side of the frame 10, and the sealing part 22 is disposed on the inner circumferential side of the base 21. The base 21 is located in the first horizontal direction ( Figure 1 The first side of the X direction is the air side (in the X direction). Figure 1 As shown in side A), the second side of the substrate 21 in the first horizontal direction is the sealing side. Figure 1 (Side B shown); The sealing part 22 includes a dustproof lip 23, a sealing lip 24 and a grease sealing lip 25 spaced apart along a first horizontal direction. The dustproof lip 23 is disposed near the air side, the grease sealing lip 25 is disposed near the sealing side, and the sealing lip 24 is disposed between the dustproof lip 23 and the grease sealing lip 25. After the motor output shaft sealing device is fitted into the preset position of the motor output shaft 30, there is a gap 31 between the dustproof lip 23 and the motor output shaft 30 for forming a labyrinth seal structure. The sealing lip 24 is interference-fitted with the motor output shaft 30, and the grease sealing lip 25 is interference-fitted with the motor output shaft 30. The outer peripheral surface of the motor output shaft 30, the sealing lip 24 and the grease sealing lip 25 form a storage space for accommodating lubricating grease.

[0040] It should be noted that the first horizontal direction is the axial direction of the motor output shaft.

[0041] The motor output shaft sealing device proposed in this utility model adopts a three-seal combination design. The outermost dustproof lip 23 forms a labyrinth structure with a micro-gap between it and the motor output shaft 30, which initially blocks the intrusion of dust and mud. The sealing lip 24 adopts a springless following design, which greatly reduces the wear of the sealing lip 24 while satisfying the requirements of dust and mud prevention, and has a long service life. The grease sealing lip 25 can store a large amount of grease, which can meet the requirements of dry wear durability while blocking the high and low pressure difference in the cavity during the use of the motor.

[0042] In one embodiment, the dustproof lip 23 includes a first lip waist 230, a first inclined surface 231, and a second inclined surface 232. The first lip waist 230 is annular, and the outer peripheral end of the first lip waist 230 is integrally formed with the sealing lip 24. The inner peripheral end of the first lip waist 230 extends toward the air side and is inclined near the center of the elastomer 20. The first inclined surface 231 and the second inclined surface 232 are disposed at the inner peripheral end of the first lip waist 230. Both the first inclined surface 231 and the second inclined surface 232 are annular, and the outer peripheral ends of the first inclined surface 231 and the second inclined surface 232 intersect to form a first lip tip 233.

[0043] It can be seen that by setting the dustproof lip 23, a dustproof lip 23 with a simple structure, easy implementation, and good dustproof effect is provided.

[0044] In one embodiment, the sealing lip 24 includes a second lip waist 240, a third inclined surface 241, and a fourth inclined surface 242. The second lip waist 240 is annular, and its outer peripheral end is integral with the substrate 21. The inner peripheral end of the second lip waist 240 extends toward the dustproof lip 23 and is inclined near the center of the elastomer 20. The third inclined surface 241 and the fourth inclined surface 242 are disposed at the inner peripheral end of the second lip waist 240. Both the third inclined surface 241 and the fourth inclined surface 242 are annular, and their outer peripheral ends intersect to form a second lip tip 243.

[0045] It can be seen that by setting the sealing lip 24, a reasonable design, easy implementation, and good sealing effect are provided.

[0046] In one embodiment, the grease sealing lip 25 includes a flexible portion 250, a third lip waist 251, a fifth inclined surface 252, and a sixth inclined surface 253. The flexible portion 250 is annular, and its outer peripheral end is integral with the substrate 21. The inner peripheral end of the flexible portion 250 is bent toward the sealing lip 24. The third lip waist 251 is annular, and its outer peripheral end is integral with the flexible portion 250. The inner peripheral end of the third lip waist 251 extends toward the sealing lip 25 and is inclined near the center of the elastomer 20. The fifth inclined surface 252 and the sixth inclined surface 253 are disposed at the inner peripheral end of the third lip waist 251. Both the fifth inclined surface 252 and the sixth inclined surface 253 are annular, and their outer peripheral ends intersect to form a third lip tip 254.

[0047] It can be seen that by designing the grease sealing lip 25, an integral hook-shaped grease sealing lip 25 is provided, which improves the grease sealing lip 25's ability to store grease.

[0048] In one implementation, the length of the second lip waist 240 is greater than the length of the first lip waist 230, and the width of the second lip waist 240 is less than the width of the first lip waist 230.

[0049] It can be seen that by designing the second lip waist 240, the sealing lip 24 has a slender lip, a larger interference fit, and a thinner waist, which improves the following performance of the sealing lip 24 while ensuring the sealing performance of the second lip waist 240.

[0050] In one implementation, the first inclined surface 231 is disposed on the air-facing side relative to the second inclined surface 232, and the width of the first inclined surface 231 is smaller than the width of the second inclined surface 232; the third inclined surface 241 is disposed on the air-facing side relative to the fourth inclined surface 242, and the width of the third inclined surface 241 is smaller than the width of the fourth inclined surface 242; the fifth inclined surface 252 is disposed on the air-facing side relative to the sixth inclined surface 253, and the width of the fifth inclined surface 252 is greater than the width of the sixth inclined surface 253.

[0051] In one implementation, the inclination angle of the fifth inclined plane 252 is smaller than the inclination angle of the sixth inclined plane 253.

[0052] It is evident that by designing each lip section, the structure of each lip section can be optimized, thereby improving the sealing performance of each lip section.

[0053] In one embodiment, the substrate 21 and the sealing portion 22 are formed by compression molding of rubber material using a mold. This provides a processing method for the elastomer 20 that is easy to process, readily achievable, and low in cost.

[0054] In one embodiment, the cross-section of the skeleton 10 is "L" shaped, and the elastomer 20 completely or partially covers the skeleton 10.

[0055] Specifically, the frame 10 is made of metal.

[0056] It can be seen that by setting the skeleton 10, a skeleton 10 with a simple structure and high reliability is provided.

[0057] It should be noted that, depending on the actual needs, the cross-section of the skeleton 10 can be set to a straight line, a wave shape, etc.

[0058] In one embodiment, a first chamfer 26 is provided at the edge of the outer peripheral end of the elastomer 20 near the air side, and a second chamfer 27 is provided at the edge of the outer peripheral end of the elastomer 20 near the sealing side.

[0059] It can be seen that by setting the first chamfer 26 and the second chamfer 27 on the elastomer 20, the installation of the sealing device is facilitated, and a certain gap is provided between the elastomer 20 and the mounting groove, which allows space for the deformation of the elastomer 20.

[0060] Of course, it should be noted that the motor output shaft sealing device proposed in this utility model embodiment can also be applied to rotating shafts similar to motor output shafts.

[0061] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above examples. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing device for the output shaft of a motor, characterized in that, The motor output shaft sealing device includes a skeleton and an elastomer, both of which are annular structures, wherein: The elastomer includes a matrix and a sealing portion. The matrix is ​​integrally formed on the inner circumferential side of the skeleton, and the sealing portion is disposed on the inner circumferential side of the matrix. The first side of the matrix in the first horizontal direction is the air side, and the second side of the matrix in the first horizontal direction is the sealing side. The sealing part includes a dustproof lip, a sealing lip, and a grease sealing lip spaced apart along a first horizontal direction. The dustproof lip is disposed near the air side, the grease sealing lip is disposed near the sealing side, and the sealing lip is disposed between the dustproof lip and the grease sealing lip. After the motor output shaft sealing device is installed in the preset position of the motor output shaft, there is a gap between the dustproof lip and the motor output shaft to form a labyrinth seal structure. The sealing lip is interference-fitted with the motor output shaft, and the grease sealing lip is interference-fitted with the motor output shaft. The outer peripheral surface of the motor output shaft, the sealing lip, and the grease sealing lip form a storage space for accommodating lubricating grease.

2. The motor output shaft sealing device according to claim 1, characterized in that, The dustproof lip includes a first lip waist, a first inclined surface, and a second inclined surface, wherein: The first lip waist is annular, and the outer peripheral end of the first lip waist is integral with the sealing lip. The inner peripheral end of the first lip waist extends toward the air side and is inclined near the center of the elastomer. The first and second inclined surfaces are disposed at the inner peripheral end of the first lip waist. Both the first and second inclined surfaces are annular. The outer peripheral ends of the first and second inclined surfaces intersect to form the first lip tip.

3. The motor output shaft sealing device according to claim 2, characterized in that, The sealing lip includes a second lip waist, a third bevel, and a fourth bevel, wherein: The second lip waist is annular, and the outer peripheral end of the second lip waist is an integral structure with the substrate. The inner peripheral end of the second lip waist extends toward the dustproof lip and is inclined near the center of the elastomer. The third and fourth inclined surfaces are disposed at the inner peripheral end of the second lip waist. Both the third and fourth inclined surfaces are annular, and the outer peripheral ends of the third and fourth inclined surfaces intersect to form the second lip tip.

4. The motor output shaft sealing device according to claim 3, characterized in that, The grease-sealing lip includes a flexible portion, a third lip waist, a fifth bevel, and a sixth bevel, wherein: The flexible portion is annular, and the outer peripheral end of the flexible portion is integral with the substrate. The inner peripheral end of the flexible portion is bent toward the sealing lip. The third lip waist is annular, and the outer peripheral end of the third lip waist is an integral structure with the flexible part. The inner peripheral end of the third lip waist extends toward the sealing lip and is inclined near the center of the elastomer. The fifth and sixth inclined surfaces are disposed at the inner peripheral end of the third lip waist. Both the fifth and sixth inclined surfaces are annular, and their outer peripheral ends intersect to form the third lip tip.

5. The motor output shaft sealing device according to claim 4, characterized in that, The length of the second lip waist is greater than the length of the first lip waist, and the width of the second lip waist is less than the width of the first lip waist.

6. The motor output shaft sealing device according to claim 4, characterized in that, The first inclined surface is positioned relative to the second inclined surface on the side closer to the air, and the width of the first inclined surface is smaller than the width of the second inclined surface; The third inclined surface is positioned relative to the fourth inclined surface and closer to the air side, and the width of the third inclined surface is smaller than the width of the fourth inclined surface; The fifth inclined surface is positioned relative to the sixth inclined surface and closer to the air side, and the width of the fifth inclined surface is greater than the width of the sixth inclined surface.

7. The motor output shaft sealing device according to claim 6, characterized in that, The inclination angle of the fifth inclined plane is smaller than that of the sixth inclined plane.

8. The motor output shaft sealing device according to claim 1, characterized in that, The substrate and sealing part are formed by compression molding of rubber material using a mold.

9. The motor output shaft sealing device according to claim 1, characterized in that, The skeleton has an "L" shaped cross section, and the elastomer completely or partially covers the skeleton.

10. The motor output shaft sealing device according to claim 1, characterized in that, The outer peripheral end of the elastomer has a first chamfer at the edge near the air side, and the outer peripheral end of the elastomer has a second chamfer at the edge near the sealing side.

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