Oil seal for speed reducer with ultrahigh rotating speed

Abstract

The utility model relates to an oil seal for an ultrahigh rotating speed reducer, which comprises a framework and rubber bodies, the framework is wrapped by the rubber bodies, the framework comprises a ring-shaped outer supporting part and a ring-shaped inner supporting part, the outer supporting part and the inner supporting part are connected into a whole, the section of the framework is J-shaped, the rubber bodies comprise a first rubber body and a second rubber body, and the first rubber body and the second rubber body are connected into a whole. The first rubber body wraps the outer supporting part, a first sealing lip is arranged on the outer side face of the first rubber body, the front portion of the second rubber body wraps the inner supporting part, the middle portion of the second rubber body arches and bends upwards, and the rear portion of the second rubber body extends vertically and downwards, so that a second sealing lip is formed in the middle-rear portion of the second rubber body and comprises a lip opening. A spiral groove is formed in the lip, and the rotating direction of the spiral groove is the same as that of a shaft of the speed reducer. By the adoption of the technical scheme, it can be guaranteed that the sealing performance of the oil seal cannot lose efficacy under the ultrahigh rotating speed condition, the service time is longer, the service life is longer, the structure is simple, and installation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of oil seals, in particular to an oil seal for an ultra-high speed reducer. Background Art

[0002] One of the main applications of electric vehicles at present is electric drive, which consists of a motor, a reducer and an electronic control system. While keeping the motor running dry, the transmission needs sufficient lubrication, so a highly reliable rotary seal is required between the motor and the reducer. Compared with traditional engines, the speed of electric motors is much greater than that of traditional engines. The speed of traditional engines is generally 0-5000 rpm, and the speed at idle is generally 700-1100 rpm. The peak speed of most domestic motors is below 10,000 rpm, while that of foreign motors is basically above 10,000 rpm. At present, domestic manufacturers are also developing high-speed drive motors with a speed of 10,000-15,000 rpm, and can even reach more than 15,000 rpm. The current traditional oil seals are difficult to meet the above working conditions. Under the above high speed or even ultra-high speed working conditions, the sealing performance is not enough and it is very easy to cause oil leakage and other problems. At the same time, there is also a defect of short life. Therefore, there is an urgent need for an oil seal that can not only meet the sealing requirements of the reducer but also extend the service life. Summary of the invention

[0003] The utility model aims to provide an oil seal for an ultra-high speed reducer, aiming to solve the problem that the existing traditional oil seal is difficult to meet the sealing requirements of the ultra-high speed reducer and has a short service life.

[0004] The technical solution adopted by the utility model is: an oil seal for an ultra-high speed reducer, comprising a skeleton and a rubber body, the rubber body wraps the skeleton, the skeleton comprises a circular outer support portion and an inner support portion, the outer support portion and the inner support portion are connected as a whole, the cross section of the skeleton is "J"-shaped, the rubber body comprises a first rubber body and a second rubber body, the first rubber body wraps the outer support portion, a first sealing lip is arranged on the outer side surface of the first rubber body, the front part of the second rubber body wraps the inner support portion, the middle part is arched and bent upward, and the rear part extends vertically downward, so that the middle and rear part of the second rubber body forms a second sealing lip, the second sealing lip comprises a lip opening, a spiral groove is arranged on the lip opening, and the rotation direction of the spiral groove is the same as the rotation direction of the shaft of the reducer.

[0005] A further technical solution of the utility model is that the surface of the second rubber body is sprayed with PTFE coating to form a protective surface, which can effectively improve the wear resistance of the oil seal, extend the service life and increase the service life.

[0006] A further technical solution of the utility model is: a plurality of corrugated protrusions are arranged on the first sealing lip to reduce the friction resistance between the first sealing lip and the shaft.

[0007] A further technical solution of the utility model is: the skeleton is expanded so that the inner diameter of the upper support part is larger than the inner diameter of the lower support part, which can provide greater supporting force for the sealing lip, ensure that the product is not deformed during the press-fitting process, and the waist structure is more stable.

[0008] The beneficial effects of the utility model are as follows: due to the adoption of the above technical scheme, the oil seal for an ultra-high speed reducer of the utility model can ensure that the sealing performance of the oil seal will not fail under ultra-high speed conditions, has a longer service life, and has a simple structure and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the cross-sectional structure of an oil seal for an ultra-high speed reducer described in the utility model. DETAILED DESCRIPTION

[0010] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0011] Example:

[0012] like Figure 1 An oil seal for an ultra-high speed reducer shown in the figure includes a skeleton and a rubber body, the rubber body wraps the skeleton, and the skeleton is formed into a roughly circular special-shaped stamping part in the form of special-shaped stamping to solve the problem that the overall deformation of the oil seal affects the later sealing performance due to excessively fast and high pressing pressure during the installation process. The skeleton includes a circular outer support part 1 and an inner support part 2, the outer support part and the inner support part are connected as a whole, and the cross-section of the skeleton is "J"-shaped. The rubber body includes a first rubber body 3 and a second rubber body 4, the first rubber body wraps the outer support part, and a first sealing lip 5 is provided on the outer side of the first rubber body. The front part of the second rubber body wraps the inner support part, the middle part is arched and bent upward, and the rear part extends vertically downward, so that the middle and rear part of the second rubber body forms a second sealing lip 6, and the second sealing lip includes a lip mouth, and a spiral groove 7 is provided on the lip mouth. The spiral groove is located on the air side, and its rotation direction is the same as the rotation direction of the reducer shaft, so as to improve the sealing ability of the oil seal under ultra-high speed rotation conditions.

[0013] In the above technical solution, the absence of a spring structure can reduce the overall cost. The structure without a spring can reduce the clamping force on the rotating shaft of the reducer and reduce the degree of wear. The structure is simple and the oil seal can be installed simply and quickly.

[0014] Furthermore, the surface of the second rubber body is sprayed with PTFE paint to form a protective surface, and the PTFE paint is sprayed on the spiral groove of the second rubber body, which can improve the wear resistance of the product, extend the use time and increase the service life. When spraying, the PTFE paint is sprayed on the second rubber body close to the rotating shaft of the reducer to further improve the wear resistance of the product.

[0015] Furthermore, a plurality of corrugated protrusions are provided on the first sealing lip to reduce the friction resistance between the first sealing lip and the shaft.

[0016] Furthermore, the skeleton is expanded so that the inner diameter of the upper support portion is larger than the inner diameter of the lower support portion, which can provide greater support force for the sealing lip, ensure that the product is not deformed during the press-fitting process, and the waist structure is more stable.

[0017] The oil seal realizes the molding of the skeleton and the rubber body through a one-time manufacturing method.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil seal for an ultra-high speed reducer, characterized in that: The invention comprises a frame and a rubber body, wherein the rubber body wraps the frame, the frame comprises a circular outer support part and an inner support part, the outer support part and the inner support part are connected as a whole, the cross section of the frame is "J" shaped, the rubber body comprises a first rubber body and a second rubber body, the first rubber body wraps the outer support part, a first sealing lip is arranged on the outer side surface of the first rubber body, the front part of the second rubber body wraps the inner support part, the middle part is arched and bent upward, and the rear part extends vertically downward, so that the middle and rear part of the second rubber body forms a second sealing lip, the second sealing lip comprises a lip opening, a spiral groove is arranged on the lip opening, and the rotation direction of the spiral groove is the same as the rotation direction of the shaft of the reducer.

2. The oil seal for ultra-high speed reducer according to claim 1, characterized in that: The surface of the second rubber body is sprayed with PTFE coating to form a protective surface.

3. The oil seal for ultra-high speed reducer according to claim 1, characterized in that: A plurality of corrugated protrusions are arranged on the first sealing lip.

4. The oil seal for ultra-high speed reducer according to claim 1, characterized in that: The frame is expanded so that the inner diameter of the upper support portion is larger than the inner diameter of the lower portion of the support portion.

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