High-speed oil seal for rotating shaft of motor
By designing a high-speed oil seal for the motor shaft that includes a bent inner frame and a covered rubber body, combined with an anti-reverse lip and a slope-shaped power thread groove, the problem of poor sealing of the existing oil seal at high-speed rotation and high speed is solved. Achieving long life and efficient sealing effects.
Patent Information
- Application Number
- CN202420575653.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-03-22
AI Technical Summary
In existing electric drive systems, the two-way oil return line type oil seal cannot be effectively sealed under high speed and high speed return conditions, resulting in oil leakage and short service life.
A high-speed oil seal for a motor shaft is designed, which uses an annular outer vulcanized body and an inner vulcanized body. The inner vulcanized body includes an inner skeleton and a first rubber body. The inner skeleton has a bent structure, and the rubber body covers and extends to form polytetrafluoroethylene. The vinyl lip, combined with the anti-reverse lip and the sloped PTFE power thread groove, ensures that the oil seal does not leak oil under high-speed reverse conditions.
It realizes that oil leakage is less likely to occur under high-speed return conditions, has a long service life, and allows high-speed operation, meeting the usage requirements of 16,000rpm.
Smart Images
Figure CN222377223U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new energy vehicles, in particular to a high-speed oil seal for a motor shaft. Background Art
[0002] In the early days of new energy vehicle development, some models used TC-type standard oil seals as electric drive input shaft oil seals. However, with the improvement of application requirements, especially the reverse speed reaching 3150rpm, TC-type oil seals are almost unable to cope with the requirements.
[0003] Since the peak speed of the motor in the electric drive system is generally between 10,000 and 16,000 rpm, the corresponding linear speed is generally between 18 and 35 m / s. Among the new energy vehicles on the market, more than 80% of the electric drive high-speed oil seals use two-way oil return line fluororubber oil seals. However, there is a problem with the application of this oil seal in the electric drive system: the motor is different from the engine and requires two-way rotation to complete the forward and reverse functions. Therefore, the oil seal must be able to meet the two-way sealing requirements. The oil return effect of this two-way oil return line type will be worse than that of the one-way oil return line. The allowable linear speed of the two-way oil return line type oil seal will usually drop below 30 m / s.
[0004] Therefore, when the line speed is greater than 30m / s, usually only one-way oil return line oil seals can be used, but the one-way oil return line cannot withstand reversal speeds greater than 3m / s.
[0005] Polytetrafluoroethylene oil seals have many advantages, including excellent chemical compatibility (compatible with almost all oils), high and low temperature range of -40 to 250°C, low friction coefficient, self-lubricating ability, etc. However, conventional PTFE has no reversal resistance: due to the one-way pumping characteristics of the spiral groove, it is not resistant to reversal.
[0006] In view of this situation, we must make corresponding improvements to the design of the spiral groove or the lip structure to make it suitable for bidirectional rotation conditions. Utility Model Content
[0007] In view of the defects existing in the prior art, the purpose of the utility model is to provide a high-speed oil seal for a motor shaft, which is a new type of polytetrafluoroethylene seal for a high-speed oil seal of an electric drive system that can withstand high-speed reversal, has low friction, is not prone to oil leakage, and has a long service life.
[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is: a high-speed oil seal for a motor shaft, comprising an annular outer vulcanized body and an inner vulcanized body, the inner vulcanized body comprising an inner skeleton and a first rubber body, the inner skeleton comprising a first horizontal section, the outer end of the first horizontal section being bent downward to form a first vertical section; the first rubber body covers the top surface of the first horizontal section, and the inner end of the first rubber body is bent downward after extending out of the first horizontal section to form a polytetrafluoroethylene lip, the lower end of the polytetrafluoroethylene lip is provided with an anti-reversal lip, and the inner side surface of the polytetrafluoroethylene lip is provided with a polytetrafluoroethylene power thread groove.
[0009] Further improvements are: the polytetrafluoroethylene power thread groove is an inverted triangle with an opening facing the oil side; the angles between the polytetrafluoroethylene power thread groove and the shaft are 40°±5° and 30°±2° respectively, the pitch is 0.75±0.1mm, and the groove depth is 0.2-0.3mm.
[0010] The further improvement is that: the outer vulcanized body includes an outer frame, a second rubber body, a third rubber body, a fourth rubber body and a sealing gasket; the outer frame includes a second horizontal section, the outer end of the second horizontal section is bent downward to form a second vertical section; the second rubber body covers the outer side surface of the second vertical section; the third rubber body covers the top surface of the second horizontal section; the fourth rubber body wraps the inner end of the second horizontal section; the sealing gasket is arranged on the bottom surface of the second horizontal section to resist the first rubber body; the fourth rubber body, the sealing gasket and the first rubber body surround an oil storage tank, and the opening of the oil storage tank is located between the fourth rubber body and the first rubber body.
[0011] A further improvement is that a sinking portion is provided at the inner end of the fourth rubber body, and the oil storage tank is in a T-shaped structure.
[0012] A further improvement is that the lower end of the second vertical section is bent inward to form a flange portion for abutting against the lower end of the first vertical section.
[0013] A further improvement is that a first groove is provided on the inner side surface of the second vertical section near the lower end.
[0014] A further improvement is that a guiding slope is arranged at the lower end of the second rubber body, and a notch is arranged at the upper end of the second rubber body.
[0015] A further improvement is that a second groove is provided on the top of the third rubber body.
[0016] A further improvement is that the second rubber body, the third rubber body, the fourth rubber body and the sealing gasket are an integrated structure, and a third groove is provided at the connection between the sealing gasket and the fourth rubber body.
[0017] A further improvement is that the outer end of the first rubber body extends out of the first horizontal section to form an extension portion for abutting against the inner side surface of the second vertical section, one end of the polytetrafluoroethylene power thread groove extends to the anti-reversal lip, and the other end of the polytetrafluoroethylene power thread groove extends to the portion of the first rubber body located in the oil storage tank.
[0018] The beneficial effects of the utility model are:
[0019] The utility model discloses a motor shaft high-speed oil seal capable of withstanding high-speed reverse rotation, low friction, not prone to oil leakage and long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the structure of the motor shaft high-speed oil seal in the embodiment of the utility model;
[0021] Figure 2 It is a cross-sectional view of a high-speed oil seal of a motor shaft in an embodiment of the utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the internal vulcanized body in the embodiment of the utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the internal and external sulfide body in the embodiment of the utility model;
[0024] Figure 5 This is a schematic diagram of the structure of the polytetrafluoroethylene power thread groove in the embodiment of the utility model;
[0025] Figure 6 The manufacturing process of the motor shaft high-speed oil seal in the embodiment of the utility model is shown in FIG. Figure 1 ;
[0026] Figure 7 The manufacturing process of the motor shaft high-speed oil seal in the embodiment of the utility model is shown in FIG. Figure 2 ;
[0027] Figure 8 The manufacturing process of the motor shaft high-speed oil seal in the embodiment of the utility model is shown in FIG. Figure 3 .
[0028] Reference numerals:
[0029] 1-internal vulcanized body; 11-internal skeleton; 111-first horizontal section; 112-first vertical section; 12-first rubber body; 121-polytetrafluoroethylene lip; 122-anti-reversal lip; 123-polytetrafluoroethylene power thread groove; 124-extension portion;
[0030] 2-external vulcanized body; 21-external skeleton; 211-second horizontal section; 212-second vertical section; 213-flange portion; 214-first groove; 22-second rubber body; 221-guide slope; 222-notch portion; 23-third rubber body; 231-second groove; 24-fourth rubber body; 241-sunken portion; 25-sealing pad; 251-third groove; 26-oil storage tank. DETAILED DESCRIPTION
[0031] The embodiments of the present invention are described in detail below. The embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.
[0032] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.
[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.
[0034] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, but cannot be understood as limiting the utility model.
[0035] See also Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a motor shaft high-speed oil seal, comprising an annular outer vulcanized body 2 and an inner vulcanized body 1.
[0036] See also Figure 2 and Figure 3As shown, the inner vulcanized body 1 includes an inner skeleton 11 and a first rubber body 12. The inner skeleton 11 includes a first horizontal section 111. The outer end of the first horizontal section 111 is bent downward to form a first vertical section 112. The first rubber body 12 covers the top surface of the first horizontal section 111, and the inner end of the first rubber body 12 extends out of the first horizontal section 111 and then bends downward to form a polytetrafluoroethylene lip 121. The lower end of the polytetrafluoroethylene lip 121 is provided with an anti-reversal lip 122, the length of the anti-reversal lip is 1.8±0.3mm, and no polytetrafluoroethylene power thread groove is provided. The inner side surface of the polytetrafluoroethylene lip 121 is provided with a polytetrafluoroethylene power thread groove 123. Specifically, the outer end of the first rubber body 12 extends out of the first horizontal section 111 to form an extension portion 124 for abutting against the inner side surface of the second vertical section 212 , one end of the polytetrafluoroethylene power thread groove 123 extends to the anti-reversal lip 122 , and the other end of the polytetrafluoroethylene power thread groove 123 extends to the portion of the first rubber body 12 located in the oil storage tank 26 .
[0037] See also Figure 5 As shown, the polytetrafluoroethylene power thread groove 123 is an inverted triangle with a slope shape and the opening is toward the oil side; the angles between the polytetrafluoroethylene power thread groove 123 and the shaft are 40°±5° and 30°±2° respectively, the pitch is 0.75±0.1mm, and the groove depth is 0.2-0.3mm. The power thread groove has a pumping function, which will "suck back" the lubricating oil on the contact surface between the oil seal lip and the shaft to the oil chamber side to prevent the lubricating oil from leaking out. In addition, because the thread groove is sloped toward the oil side and cooperates with the anti-reversal lip, when reversed, it adds difficulty for the medium that attempts to flow out.
[0038] See also Figure 2 and Figure 4As shown, the outer vulcanized body 2 includes an outer frame 21, a second rubber body 22, a third rubber body 23, a fourth rubber body 24 and a sealing pad 25; the outer frame 21 includes a second horizontal section 211, the outer end of the second horizontal section 211 is bent downward to form a second vertical section 212; the second rubber body 22 covers the outer side surface of the second vertical section 212; the third rubber body 23 covers the top surface of the second horizontal section 211; the fourth rubber body 24 wraps the inner side end of the second horizontal section 211; the sealing pad 25 is arranged on the bottom surface of the second horizontal section 211, and is used to resist the first rubber body 12 to ensure that the medium will not leak from the outside after assembly; the fourth rubber body 24, the sealing pad 25 and the first rubber body 12 surround an oil storage tank 26, and the opening of the oil storage tank 26 is located between the fourth rubber body 24 and the first rubber body 12. The inner side end of the fourth rubber body 24 is provided with a sinking portion 241, and the oil storage tank 26 is in a T-shaped structure. The oil storage tank can prevent a small amount of oil from flowing into the air side due to excessive jumping during reversal, and the oil will be stored in this tank. Generally, the reversal time is very short. When the forward direction is changed, the oil in this tank will be pumped back to the oil side; the lower end of the second vertical section 212 is bent inward to form a flange portion 213 for supporting the lower end of the first vertical section 112. A first groove 214 is provided at a position near the lower end of the inner side surface of the second vertical section 212. A guide slope 221 is provided at the lower end of the second rubber body 22, and a notch portion 222 is provided at the upper end of the second rubber body 22. A second groove 231 is provided at the top of the third rubber body 23. The second rubber body 22, the third rubber body 23, the fourth rubber body 24 and the sealing gasket 25 are an integrated structure, and a third groove 251 is provided at the connection between the sealing gasket 25 and the fourth rubber body 24.
[0039] The utility model oil seal is provided with an anti-reversal lip and a new type of power thread groove at the lower end of the polytetrafluoroethylene lip, and the thread groove is sloped toward the oil side, which can ensure that there is no oil leakage when reversing at 3150RPM. A T-type oil storage groove is provided on the lower side of the upper end surface of the oil seal, which is an anti-reversal safety device. If a small amount of lubricating oil seeps into the air side during reversal, it will be stored in the T-type groove. When it changes to the forward direction, this oil will be pumped back to the oil side; the polytetrafluoroethylene power lip with spiral groove can allow a linear speed of 40 to 45m / s. It fully meets the use requirements of the maximum speed of the motor shaft of 16000rpm; therefore, the utility model oil seal is a high-speed oil seal for the motor shaft that can withstand high-speed reversal, has low friction, is not prone to oil leakage, and has a long service life.
[0040] The manufacturing process of the utility model is as follows:
[0041] 1. See Figure 6 As shown, the second rubber body, the third rubber body, the fourth rubber body, the sealing pad and the outer frame are first molded and vulcanized into a whole using a rubber mold.
[0042] 2. See Figure 7As shown, the polytetrafluoroethylene lip and the inner frame are installed and rolled together;
[0043] 3. See Figure 8 As shown, two-stage vulcanization is used to shape the flat polytetrafluoroethylene lip into a bell-shaped shape.
[0044] In the description of the specification, the description with reference to the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model, and the schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0045] Through the description of the above structure and principle, technicians in the relevant technical field should understand that the present invention is not limited to the above-mentioned specific implementation methods. Improvements and substitutions based on the present invention using the known technology in the field all fall within the protection scope of the present invention and should be defined by the claims.
Claims
1. A motor shaft high-speed oil seal, comprising an annular outer vulcanized body (2) and an inner vulcanized body (1), characterized in that: The inner vulcanized body (1) comprises an inner skeleton (11) and a first rubber body (12); the inner skeleton (11) comprises a first horizontal section (111); the outer end of the first horizontal section (111) is bent downward to form a first vertical section (112); the first rubber body (12) covers the top surface of the first horizontal section (111); the inner end of the first rubber body (12) extends out of the first horizontal section (111) and then bends downward to form a polytetrafluoroethylene lip (121); the lower end of the polytetrafluoroethylene lip (121) is provided with an anti-reversal lip (122); and the inner side surface of the polytetrafluoroethylene lip (121) is provided with a polytetrafluoroethylene power thread groove (123).
2. The motor shaft high-speed oil seal according to claim 1, characterized in that: The polytetrafluoroethylene power thread groove (123) is in the shape of an inverted triangle with an opening facing the oil side; the angles between the polytetrafluoroethylene power thread groove (123) and the shaft are 40°±5° and 30°±2° respectively, the thread pitch is 0.75±0.1mm, and the groove depth is 0.2-0.3mm.
3. The motor shaft high-speed oil seal according to claim 1, characterized in that: The outer vulcanized body (2) comprises an outer frame (21), a second rubber body (22), a third rubber body (23), a fourth rubber body (24) and a sealing pad (25); the outer frame (21) comprises a second horizontal section (211), the outer end of the second horizontal section (211) is bent downward to form a second vertical section (212); the second rubber body (22) covers the outer side surface of the second vertical section (212); the third rubber body (23) covers the top surface of the second horizontal section (211); the fourth rubber body (24) wraps the inner end of the second horizontal section (211); the sealing pad (25) is arranged on the bottom surface of the second horizontal section (211) and is used to resist the first rubber body (12); the fourth rubber body (24), the sealing pad (25) and the first rubber body (12) surround an oil storage tank (26), and the opening of the oil storage tank (26) is located between the fourth rubber body (24) and the first rubber body (12).
4. The motor shaft high-speed oil seal according to claim 3, characterized in that: The inner end of the fourth rubber body (24) is provided with a sinking portion (241), and the oil storage tank (26) is in a T-shaped structure.
5. The motor shaft high-speed oil seal according to claim 3, characterized in that: The lower end of the second vertical section (212) is bent inwardly to form a flange portion (213) for abutting against the lower end of the first vertical section (112).
6. The motor shaft high-speed oil seal according to claim 3, characterized in that: A first groove (214) is provided on the inner side surface of the second vertical section (212) near the lower end.
7. The motor shaft high-speed oil seal according to claim 3, characterized in that: The lower end of the second rubber body (22) is provided with a guiding inclined surface (221), and the upper end of the second rubber body (22) is provided with a notch portion (222).
8. The motor shaft high-speed oil seal according to claim 3, characterized in that: A second groove (231) is provided on the top of the third rubber body (23).
9. The motor shaft high-speed oil seal according to claim 3, characterized in that: The second rubber body (22), the third rubber body (23), the fourth rubber body (24) and the sealing pad (25) are an integrated structure, and a third groove (251) is provided at the connection between the sealing pad (25) and the fourth rubber body (24).
10. The motor shaft high-speed oil seal according to claim 3, characterized in that: The outer end of the first rubber body (12) extends out of the first horizontal section (111) to form an extension portion (124) for abutting against the inner side surface of the second vertical section (212); one end of the polytetrafluoroethylene power thread groove (123) extends to the anti-reversal lip (122); and the other end of the polytetrafluoroethylene power thread groove (123) extends to the portion of the first rubber body (12) located in the oil storage tank (26).