Low torque cartridge oil seal

Abstract

The utility model relates to axle oil seal technical field, concretely is a low torque box type oil seal, the device includes the outer support framework and inner support framework, sets up the rubber body between the outer support framework and inner support framework, the rubber body fixedly connected on the outer support framework, the rubber body with the inner support framework interference fit, the rubber body's outside wall fixedly connected with the coating that can reduce the friction coefficient between it and the inner support framework, the device effectively reduces the friction heat when operating, reduces the torque, and the wear resistance is good, and the service life is longer, the device designs the dustproof lip of many channels, prevents the invasion of external impurities etc, prevents the lubricating oil in the cavity from leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to axle oil seal technical field, concretely is a low torque box type oil seal. BACKGROUND

[0002] Axle oil seal is one of important constitutive sealing parts in chassis system, and the original single oil seal structure form or multi oil seal assembly form is adopted by host factory, the existing axle oil seal includes outer support framework, inner support framework, oil seal spring and the rubber body arranged between the outer support framework and the inner support framework, the support framework is L-shaped, is relatively single, the lip position of rubber body and the inner support framework interference fit, oil seal spring is imprisoned in the lip position of rubber body radially, the torque between rubber body and inner support framework is big, causes the high temperature rise of rubber body and inner support framework friction, causes lubricating oil consumption, and the failure feedback in the later market appears, causes the final use customer to be dissatisfied. SUMMARY

[0003] In order to solve the above problems of prior art, the utility model provides a low torque box type oil seal, effectively reduces the friction heat when running, reduces the torque.

[0004] In order to achieve the above object, the utility model provides the following technical scheme: a low torque box type oil seal, including outer support framework and inner support framework, rubber body is arranged between the outer support framework and the inner support framework, the rubber body is fixedly connected on the outer support framework, the rubber body is interference fit with the inner support framework, the outer lateral wall of the rubber body is fixedly connected with the coating capable of reducing the friction coefficient between the rubber body and the inner support framework.

[0005] Adopt the above structural design, the coating can reduce the friction coefficient between the rubber body and the inner support framework, effectively reduces the friction heat when running, reduces the torque.

[0006] Preferably, the coating is sprayed on the outer lateral wall of the rubber body.

[0007] Adopt the above structural design, and the coating is uniformly fixedly connected on the rubber body.

[0008] Preferably, the coating is made of polytetrafluoroethylene material.

[0009] Adopt the above structural design, polytetrafluoroethylene has good adhesion and is not easy to fall off from the rubber body, and polytetrafluoroethylene is high-temperature resistant, increases the service life of the device, and has good self-lubricating performance.

[0010] Preferably, the radial cross-section of the outer support frame is L-shaped, the inner support frame includes an annular first frame and an annular second frame, the radial cross-section of the second frame is U-shaped, the lower end of the first frame is fixedly connected to the upper end of the inner side of the second frame, the upper end of the outer side of the second frame is in contact with the bend of the outer support frame, and an outer rubber sealing layer is fixedly connected to the outer walls of the outer support frame, the first frame, and the second frame.

[0011] The above structural design achieves a good sealing effect.

[0012] Preferably, the upper end of the first frame is fixedly connected to a limiting frame, the radial cross-section of the limiting frame is an L-shaped structure with the opening facing downwards, and the lower end of the limiting frame is disposed opposite to the bottom surface of the outer support frame.

[0013] The above structural design prevents excessive axial movement from affecting the sealing effect of the oil seal.

[0014] Preferably, the rubber body includes a sealing lip fixedly connected to the outer support frame, a first dustproof lip and a second dustproof lip disposed between the outer support frame and the second frame, the first dustproof lip and the second dustproof lip being fixedly connected to the sealing lip, the first dustproof lip and the second dustproof lip being interference-fitted with the second frame, the sealing lip being interference-fitted with the first frame, and a fastening spring being sleeved on the sealing lip.

[0015] The above structural design prevents external impurities from entering the oil seal.

[0016] Preferably, the lower end of the sealing lip and the first skeleton form a cavity, and grease is applied to the inside of the cavity, between the first dustproof lip and the second skeleton, and between the second dustproof lip and the second skeleton.

[0017] The above structural design can reduce torque and increase wear resistance.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This device effectively reduces frictional heat and torque during operation, and has good wear resistance and a longer service life. The device is also designed with multiple dust-proof lips to prevent the intrusion of external impurities and prevent the leakage of lubricating oil in the cavity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the radial section of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the external support frame and rubber body of this utility model;

[0022] Figure 3This is a cross-sectional structural diagram of the internal support skeleton of this utility model. Detailed Implementation

[0023] Please see Figure 1 , Figure 2 , Figure 3 This utility model provides a technical solution: a low-torque box-type oil seal, including an outer support frame 1 and an inner support frame 2, and a rubber body 3 disposed between the outer support frame 1 and the inner support frame 2. The rubber body 3 is fixedly connected to the outer support frame 1, and the rubber body 3 is interference-fitted with the inner support frame 2. A coating 4 that can reduce the coefficient of friction between the rubber body 3 and the inner support frame 2 is fixedly connected to the outer side wall of the rubber body 3.

[0024] The coating 4 is sprayed onto the outer wall of the rubber body 3.

[0025] The coating 4 is made of polytetrafluoroethylene (PTFE). The outer support frame 1 and the inner support frame 2 are made of metal. The coefficient of friction between PTFE and metal is a maximum of 0.2, which is 1 / 4 that of rubber. PTFE also has good self-lubricating properties, effectively reducing frictional heat during operation and reducing torque.

[0026] The outer support frame 1 has an L-shaped radial cross-section. The inner support frame 2 includes a ring-shaped first frame 21 and a ring-shaped second frame 22. The radial cross-section of the second frame 22 is U-shaped. The lower end of the first frame 21 is fixedly connected to the upper end of the inner side of the second frame 22. The upper end of the outer side of the second frame 22 is in contact with the bend of the outer support frame 1. An outer rubber sealing layer is fixedly connected to the outer walls of the outer support frame 1, the first frame 21, and the second frame 22. The outer rubber sealing layer adopts a multi-protruding sealing rib design.

[0027] The upper end of the first frame 21 is fixedly connected to the limiting frame 5. The radial cross section of the limiting frame 5 is an L-shaped structure with the opening facing downwards. The lower end of the limiting frame 5 is arranged opposite to the bottom surface of the outer support frame 1.

[0028] The rubber body 3 includes a sealing lip 31 fixedly connected to the outer support frame 1, a first dustproof lip 61 and a second dustproof lip 62 disposed between the outer support frame 1 and the second frame 22. Both the first dustproof lip 61 and the second dustproof lip 62 are fixedly connected to the sealing lip 31, and both the first dustproof lip 61 and the second dustproof lip 62 are interference-fitted with the second frame 22. The sealing lip 31 is interference-fitted with the first frame 21, and a fastening spring 32 is sleeved on the sealing lip 31. The sealing lip 31 is manufactured using an automatic cutting and forming process to ensure the sharpness of the upper part of the sealing lip 31.

[0029] The lower end of the sealing lip 31 and the first skeleton 21 form a cavity 33. Lubricating grease is applied inside the cavity 33, between the first dustproof lip 61 and the second skeleton 22, and between the second dustproof lip 62 and the second skeleton 22. The first dustproof lip 61 is located on the outer side of the second skeleton 22, and both the first dustproof lip 61 and the second skeleton 22 have a barbed structure. Lithium-based grease is applied inside the cavity 33, between the first dustproof lip 61 and the second skeleton 22, and between the second dustproof lip 62 and the second skeleton 22 to increase wear resistance.

[0030] Working principle: The outer support frame 1 is interference-fitted with the shell through the outer rubber sealing layer, and the first frame 21 is interference-fitted with the shaft through the outer rubber sealing layer. During the rotation of the shaft, the coating 4 reduces the coefficient of friction between the rubber body 3 and the inner support frame 2, effectively reducing frictional heat during operation and reducing torque.

[0031] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the scope of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model's implementation.

[0032] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A low-torque box-type oil seal, comprising an outer support skeleton (1) and an inner support skeleton (2), and a rubber body (3) disposed between the outer support skeleton (1) and the inner support skeleton (2), characterized in that: The rubber body (3) is fixedly connected to the outer support frame (1), the rubber body (3) is interference-fitted with the inner support frame (2), and a coating (4) that can reduce the coefficient of friction between the rubber body (3) and the inner support frame (2) is fixedly connected to the outer side wall of the rubber body (3).

2. The low-torque box-type oil seal according to claim 1, characterized in that: The coating (4) is sprayed onto the outer wall of the rubber body (3).

3. A low-torque box-type oil seal according to claim 1 or 2, characterized in that: The coating (4) is made of polytetrafluoroethylene.

4. A low-torque box-type oil seal according to claim 3, characterized in that: The radial cross-section of the outer support frame (1) is L-shaped. The inner support frame (2) includes a ring-shaped first frame (21) and a ring-shaped second frame (22). The radial cross-section of the second frame (22) is U-shaped. The lower end of the first frame (21) is fixedly connected to the upper end of the inner side of the second frame (22). The upper end of the outer side of the second frame (22) is in contact with the bend of the outer support frame (1). An outer rubber sealing layer is fixedly connected to the outer walls of the outer support frame (1), the first frame (21), and the second frame (22).

5. A low-torque box-type oil seal according to claim 4, characterized in that: The upper end of the first frame (21) is fixedly connected to the limiting frame (5). The radial section of the limiting frame (5) is an L-shaped structure with the opening facing downwards. The lower end of the limiting frame (5) is set opposite to the bottom surface of the outer support frame (1).

6. A low-torque box-type oil seal according to claim 4, characterized in that: The rubber body (3) includes a sealing lip (31) fixedly connected to the outer support frame (1), a first dustproof lip (61) and a second dustproof lip (62) disposed between the outer support frame (1) and the second frame (22). The first dustproof lip (61) and the second dustproof lip (62) are both fixedly connected to the sealing lip (31). The first dustproof lip (61) and the second dustproof lip (62) are both interference fit with the second frame (22). The sealing lip (31) is interference fit with the first frame (21). A fastening spring (32) is sleeved on the sealing lip (31).

7. A low-torque box-type oil seal according to claim 6, characterized in that: The lower end of the sealing lip (31) and the first skeleton (21) form a cavity (33), and grease is applied inside the cavity (33), between the first dustproof lip (61) and the second skeleton (22), and between the second dustproof lip (62) and the second skeleton (22).

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