Oil seal for automobile vacuum pump

Abstract

The utility model relates to the technical field of automobile oil seals, in particular to an oil seal for an automobile vacuum pump, which comprises an outer ring, an inner ring and a flexing portion, one end of the flexing portion is connected with the top wall of the outer ring, the other end of the flexing portion is connected with the bottom wall of the inner ring, an included angle alpha is formed between the flexing portion and the outer ring, and the included angle alpha is larger than the included angle alpha. An included angle a is formed between the outer ring and the inner ring, the included angle a is an acute angle, the outer ring is provided with a protruding part, the protruding part is located at the end, connected with the flexing part, of the outer ring, an outer framework is embedded in the axial direction of the outer ring, an inner framework is embedded in the axial direction of the inner ring, and the outer framework and the inner framework are both in a circular ring shape. The wear resistance and the fatigue resistance of the oil seal are improved, the overall rigidity is enhanced, and the deformation under long-time use and complex working conditions is reduced, so that the sealing stability is improved, the durability is enhanced, the air leakage risk is reduced, and the working stability of the vacuum pump is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile oil seal, especially a kind of oil seal for automobile vacuum pump. BACKGROUND

[0002] Automobile vacuum pump, it is the key component applied to modern automobile brake system, its main function is to utilize vacuum assist principle, help driver more easily, more effectively brake operation, through vacuum pump generates vacuum, reduce the force required by driver when braking, so as to improve the sensitivity and safety of brake system, ensure the reliability and stability of brake system in the process of driving.

[0003] In automobile brake vacuum pump, oil seal plays a vital role, it is mainly used to seal the gap between rotating shaft in pump and pump body, prevent oil leakage in pump, ensure the lubrication of pump internal component and normal work of vacuum pump, in addition, oil seal can also prevent external impurities from entering pump, avoid the wear and failure of pump, so as to guarantee the stability and safety of brake system, such as the announcement number CN2532276Y, a kind of high-speed sliding vane vacuum pump, by pump body, rotor, sliding vane, pump bottom cover seat, one-way valve connector, oil inlet pipe screw, exhaust connector and connecting screw etc., rubber oil seal ring is installed in the rear end cover of generator to prevent the lubricating oil of sliding vane vacuum pump from entering generator;

[0004] The oil seal of existing automobile vacuum pump adopts U-shaped cross section structure design, in the assembly process of eccentric shaft, the rigidity of U-shaped cross section structure is insufficient, the oil seal of U-shaped cross section cannot effectively adapt and compensate eccentricity, it is difficult to resist the additional stress generated by eccentricity, which leads to the decline of sealing performance of oil seal, especially in long time use and complex working conditions, it is easy to break and leak, and oil seal leakage leads to the decline of sealing performance of vacuum pump, thereby causing brake force to increase, and serious traffic accidents, in addition, the sealing surface of oil seal is narrow, in the assembly process, the contact area between oil seal and shaft is small, which is not conducive to forming uniform sealing pressure, and it is easy to produce leakage risk in poor contact area;

[0005] Therefore, the structural design of automobile vacuum pump oil seal is increasingly high, a new type of automobile vacuum pump oil seal needs to be designed to improve the durability and sealing performance of oil seal. INVENTION CONTENTS

[0006] In order to optimize the cross section structure design of oil seal, improve its bending resistance eccentric structure, improve the durability and sealing performance of oil seal, the application provides a kind of oil seal for automobile vacuum pump.

[0007] The utility model provides a kind of oil seal for automobile vacuum pump adopts following technical scheme:

[0008] An oil seal for an automobile vacuum pump, comprising an outer ring, an inner ring, a flexure, one end of the flexure being connected to a top wall of the outer ring, the other end of the flexure being connected to a bottom wall of the inner ring, the flexure and the outer ring forming an included angle a, the included angle a being an acute angle, the outer ring having a protrusion provided with a protruding portion, the protruding portion being located at the end of the outer ring connected to the flexure, an outer skeleton being embedded in the axial direction of the outer ring, an inner skeleton being embedded in the axial direction of the inner ring, the outer skeleton and the inner skeleton both being circular rings.

[0009] Preferably, a first camber is arranged at the connection between the flexure and the outer ring, and a second camber is arranged at the connection between the flexure and the inner ring.

[0010] Preferably, the thickness of the flexure is 1-1.5 times the radial length of the outer skeleton, and the included angle a is 18±5°.

[0011] Preferably, the inner ring has a radially protruding assembly ring, and an annular groove is formed in the assembly ring.

[0012] Preferably, a guide inclined surface is arranged at the end of the outer ring away from the flexure, and the guide inclined surface is gradually arranged from the outer ring wall of the outer ring to the outer ring wall of the assembly ring.

[0013] Preferably, the end of the inner ring away from the flexure has a radially protruding extension, the extension is located above the inner skeleton, and the radial length of the extension is less than the axial length of the inner ring.

[0014] Preferably, the extension has a downward protruding protruding block, and the protruding height of the protruding block is 0.5-1.2 times the axial thickness of the extension.

[0015] Preferably, a plurality of groups of limiting grooves are formed in the outer ring wall of the outer ring, the limiting grooves are located on the side of the assembly ring away from the guide inclined surface, and a transition inclined surface is arranged at the connection between the inner wall of the limiting groove and the outer ring wall of the outer ring.

[0016] Preferably, a plurality of groups of first positioning grooves are formed in the inner ring wall of the outer ring, and the first positioning grooves are located at the end of the outer skeleton away from the limiting grooves.

[0017] Preferably, a plurality of groups of second positioning grooves are formed in the inner ring wall of the inner ring, and the second positioning grooves are located at the end of the inner skeleton close to the flexure.

[0018] The beneficial effects of the present application are as follows:

[0019] By setting the flexing part, the cross-sectional structure of the oil seal is designed in an N shape, and the outer skeleton and the inner skeleton are embedded, which improves the wear resistance and fatigue resistance of the oil seal, enhances the overall rigidity, reduces the deformation under long-term use and complex working conditions, thereby improving the stability of the seal, enhancing the durability, and reducing the risk of air leakage.

[0020] By designing the included angle a, the oil seal can better adapt to and compensate for the eccentricity between the shaft and the pump body, improve the eccentricity compensation ability, maintain good sealing effect, so that the oil seal can still maintain good sealing performance when bearing dynamic load, enhance the anti-air leakage ability, reduce the risk of air leakage, ensure the working stability of the vacuum pump, improve the overall safety and reliability of the brake system, and ensure the driving safety.

[0021] By setting the extension part, after the eccentric shaft is assembled with the oil seal, the extension part is folded and deformed towards the inner wall of the inner ring, one side of the extension part is attached to the inner wall of the inner ring, and the other side of the extension part is attached to the outer wall of the eccentric shaft, which improves the contact area of the oil seal and the shaft, helps to form more uniform sealing pressure, thereby improving the sealing effect and reducing the risk of air leakage. At the same time, the contact tightness between the inner ring of the oil seal and the shaft is improved, the sealing effect of the oil seal is improved, the reliability of the seal is ensured, in addition, the design of the extension part makes the shaft easier to align and position when inserted into the oil seal, simplifies the assembly process, and reduces the operation difficulty and time during assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the front view in the embodiment of the present application;

[0023] Figure 2 is the first perspective view in the embodiment of the present application;

[0024] Figure 3 is the second perspective view in the embodiment of the present application;

[0025] Figure 4 is the third perspective view in the embodiment of the present application;

[0026] Figure 5 is the cross-sectional perspective view in the embodiment of the present application;

[0027] Figure 6 is the cross-sectional view in the embodiment of the present application;

[0028] Figure 7 is the local schematic view in the embodiment of the present application;

[0029] Figure 8 is the assembly schematic view in the embodiment of the present application.

[0030] Explanation of reference signs: 1, outer ring; 101, protruding part; 102, first arc surface; 103, guide inclined surface; 104, assembly ring; 1041, annular groove; 105, limiting groove; 1051, transition inclined surface; 106, first positioning groove; 2, inner ring; 201, second arc surface; 202, extension; 2021, protruding block; 203, second positioning groove; 3, flexure; 4, outer skeleton; 5, inner skeleton. DETAILED DESCRIPTION

[0031] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that each technical feature and the overall technical scheme of the present application can be understood intuitively and visually, but it cannot be understood as a limitation on the protection scope of the present application.

[0032] In the description of the present application, if the orientation description such as "up", "down", "front", "back", "left", "right" and the like is indicated, the orientation or position relationship based on the orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and it does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the present application. When a certain feature is referred to as "set", "fixed", "connected" to another feature, it can be directly set, fixed, connected to another feature, or indirectly set, fixed, connected to another feature.

[0033] In the description of the present application, if "several" is referred to, it means one or more, if "multiple" is referred to, it means two or more, if "greater than", "less than", "exceeding" is referred to, it should be understood as not including the number, if "above", "below", "within" is referred to, it should be understood as including the number. If "first", "second" is referred to, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0034] In addition, unless otherwise defined, the technical terms and scientific terms used in the present application are the same as those commonly understood by the skilled in the art. The terms used in the present application are only for the description of specific embodiments, and are not intended to limit the present application. It should be understood that when used in the present application and the appended claims, the terms "include" and "contain" indicate the presence of the described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or their collections.

[0035] Embodiment: asFigures 1-8 As shown, an oil seal for an automobile vacuum pump, comprising an outer ring 1, an inner ring 2, a flexure 3, one end of the flexure 3 is connected with the top wall of the outer ring 1, the other end of the flexure 3 is connected with the bottom wall of the inner ring 2, the flexure 3 forms an included angle a with the outer ring 1, the included angle a is an acute angle, so that the cross section of the oil seal is designed as an N-shaped structure, the design of the flexure 3 makes the oil seal form a closed cavity, ensuring that the vacuum pump does not leak, the outer ring 1 has a protrusion provided with a protruding part 101, the protruding part 101 is located at the end of the outer ring 1 connected with the flexure 3, the outer ring 1 is axially embedded with an outer skeleton 4, the inner ring 2 is axially embedded with an inner skeleton, the outer skeleton 4 and the inner skeleton are both circular rings.

[0036] Through the N-shaped cross-sectional structure design of the oil seal, the setting of the outer skeleton 4 and the inner skeleton improves the wear resistance and fatigue resistance of the oil seal, enhances the overall rigidity, reduces the deformation under long-term use and complex working conditions, thereby improving the stability of the seal, enhancing the durability, reducing the risk of air leakage, secondly, the design of the included angle a makes the oil seal better adapt to and compensate for the eccentricity between the shaft and the pump body, improves the eccentricity compensation ability, maintains good sealing effect, in addition, the N-shaped structure design makes the oil seal still maintain good sealing performance when bearing dynamic load, enhances the anti-leakage ability, reduces the risk of air leakage, ensures the working stability of the vacuum pump, improves the overall safety and reliability of the brake system, and ensures the driving safety.

[0037] It is worth mentioning that the automobile vacuum pump oil seal composed of the outer skeleton 4, the inner skeleton and the rubber vulcanization bonding, the rubber is coated on the outer skeleton 4 to form the outer ring 1 of the oil seal, the rubber is coated on the inner skeleton to form the inner ring 2 of the oil seal, the flexure 3 is formed in the mold, the flexure 3 is not provided with a skeleton to have good buffering and recovery effect, the rubber adopts the high-temperature-resistant rubber in the prior art, which is beneficial to the rupture of the rubber during relative operation of the oil seal, and can meet the use requirements of the automobile vacuum pump oil seal sealing shaft.

[0038] It should be noted that the rubber is a special rubber in the prior art, which has the characteristics of high temperature resistance, oil resistance, ozone resistance, aging resistance and high air tightness, and is a synthetic rubber that can be used in harsh environments, including fluororubber, nitrile rubber and hydrogenated nitrile rubber, acrylate rubber, etc.

[0039] In order to reduce the stress concentration of the flexure part 3 and the connection between the outer ring 1 and the inner ring 2, the connection between the flexure part 3 and the outer ring 1 is provided with a first arc surface 102, and the connection between the flexure part 3 and the inner ring 2 is provided with a second arc surface 201. Through the design of the first arc surface 102 and the second arc surface 201, the stress at the connection is effectively dispersed, the stress concentration is reduced, and the risk of oil seal damage caused by stress concentration is reduced. Secondly, the first arc surface 102 and the second arc surface 201 can provide better buffering effect. When the oil seal is impacted or vibrated during assembly or use, the circular arc surface can absorb part of the energy and maintain the sealing performance, which helps to maintain the sealing reliability of the oil seal under complex working conditions. Even if it is installed on an eccentric shaft, it can also maintain good sealing performance and reduce air leakage.

[0040] In the specific structural design of the flexure part 3, the thickness of the flexure part 3 is thickness S, which is equal to 1-1.5 times the radial length of the outer skeleton 4, and the included angle a is 18°±5°. Through the design of the thickness of the flexure part 3, the flexure part 3 has a certain elasticity while maintaining sufficient strength, which helps to evenly distribute external forces to the entire flexure part 3 during oil seal operation, reduces local stress concentration, and reduces the risk of fatigue damage caused by stress concentration. Secondly, through the design of the included angle a, the stress state of the flexure part 3 is optimized, so that the flexure part 3 can better bear and disperse the axial and radial forces when subjected to axial and radial forces, prevent the rubber of the flexure part 3 from cracking, improve the overall stress performance of the oil seal, and maintain good sealing performance.

[0041] In this embodiment, the radial width of the outer skeleton 4 is 0.8mm, the radial width of the inner skeleton is 0.6mm, and the thickness S=1±0.2mm.

[0042] In order to improve the contact stability of the outer ring 1 and the inner hole wall of the vacuum pump and improve the sealing effect, the inner ring 2 has a radially protruding assembly ring 104, the assembly ring 104 is provided with an annular groove 1041, the inner diameter of the inner hole of the vacuum pump is D1, the outer diameter of the assembly ring 104 is D2, D2=D1+(0.3-0.6mm), and the radially protruding assembly ring 104 is in interference fit with the inner hole wall of the vacuum pump. Improve the assembly stability of the oil seal, which helps to maintain stable contact between the oil seal and the inner hole wall during the operation of the vacuum pump, even if there is vibration or axial force, so as to improve the overall sealing effect. By providing the annular groove 1041, the high and low tolerance generated during the assembly of the oil seal is reduced, and the shock absorption effect is also achieved, which reduces the influence of oil leakage caused by the inclination of the oil seal during pressing.

[0043] Due to the interference fit assembly ring 104, the assembly difficulty of the oil seal and the inner hole of the vacuum pump is increased, in order to facilitate the assembly of the oil seal, the outer ring 1 away from the flexure 3 one end is provided with guide inclined surface 103, guide inclined surface 103 from the outer ring wall of outer ring 1 to the outer ring wall of assembly ring 104 gradually inclined setting, the setting of guide inclined surface 103 can guide the oil seal into the inner hole of the vacuum pump, which helps the operator to accurately install the oil seal to the correct position, reduces the assembly and adjustment time.

[0044] In this embodiment, the axis length of the outer ring 1 is length H1, H1=8mm, the axis length of the assembly ring 104 is length H2, length H2=0.7±0.2mm, wherein the length H2 contains the axis length of the guide inclined surface 103.

[0045] In the assembly process, in order to improve the contact area between the oil seal and the shaft, form uniform sealing pressure, the inner ring 2 away from the flexure 3 one end has radial protruding extension 202, extension 202 is located above the inner skeleton, the radial length of extension 202 is less than the axial length of inner ring 2, the distance between the top wall of extension 202 and the top wall of inner ring 2 is 0.5mm, during assembly, the shaft is inserted into the inner ring 2, first abuts with extension 202, with the continuous insertion of the shaft, extension 202 is folded and deformed towards the inner wall of inner ring 2, one side of extension 202 is attached to the inner wall of inner ring 2, the other side of extension 202 is attached to the outer wall of the shaft, which improves the contact area between the oil seal and the shaft, and helps to form more uniform sealing pressure, thereby improving the sealing effect and reducing the risk of air leakage. At the same time, the contact tightness between the inner ring 2 of the oil seal and the shaft is improved, the sealing effect of the oil seal is improved, and the reliability of the seal is ensured. In addition, the design of extension 202 makes it easier to align and position the shaft when inserting the oil seal, simplifying the assembly process and reducing the operation difficulty and time during assembly.

[0046] In this embodiment, the inner diameter of the inner ring 2 is D3, the inner diameter of the extension 202 is D4, D4=D1-(8-12mm), D3=22.5mm, D4=11.5mm.

[0047] In order to ensure that extension 202 can abut with inner ring 2 when it is folded towards the inner wall of inner ring 2, extension 202 has a protruding bump 2021, the protruding height of bump 2021 is H3, the axial thickness of extension 202 is H4, H3=(0.5-1.2)×H4, through the close abutment of bump 2021 and the inner wall of inner ring 2, the gap on the sealing surface is reduced, thereby improving the sealing reliability of the oil seal and effectively preventing air leakage.

[0048] In this embodiment, the height H3 of the bump 2021 is 0.7±0.2mm, and the axial thickness H4 of the extension 202 is 1±0.2mm.

[0049] In order to improve the stability of the outer skeleton 4 assembled on the outer ring 1, a plurality of limiting grooves 105 are arranged on the outer ring wall of the outer ring 1. The limiting grooves 105 are arranged on the outer ring wall of the outer ring 1 from the outside. The limiting grooves 105 are located on the side of the assembly ring 104 away from the guide slope 103. The inner wall of the limiting groove 105 is provided with a transition slope 1051 at the connection with the outer ring wall of the outer ring 1. By arranging the limiting groove 105, the one end of the outer ring 1 to the outer skeleton 4 is limited. By arranging the transition slope 1051, the risk of rupture of the outer ring 1 caused by pressure concentration after the limiting groove 105 is arranged is reduced.

[0050] Specifically, the limiting groove 105 is provided with 10 groups, and the 10 groups of limiting grooves 105 are arranged on the outer ring 1 at equal angles along the center of the oil seal.

[0051] In order to further improve the stability of the outer skeleton 4 assembled on the outer ring 1, a plurality of first positioning grooves 106 are arranged on the inner ring wall of the outer ring 1. The first positioning grooves 106 are arranged on the inner ring wall of the outer ring 1 from the flexure 3. The first positioning grooves 106 are located on the end of the outer skeleton 4 away from the limiting groove 105. By arranging the first positioning groove 106, the other end of the outer ring 1 to the outer skeleton 4 is positioned.

[0052] Specifically, the first positioning groove 106 is provided with 10 groups, and the 10 groups of first positioning grooves 106 are arranged on the outer ring 1 at equal angles along the center of the oil seal.

[0053] In order to improve the stability of the inner skeleton assembled on the inner ring 2, a plurality of second positioning grooves 203 are arranged on the inner ring wall of the inner ring 2. The second positioning grooves 203 are located on the end of the inner skeleton close to the flexure 3. By arranging the second positioning groove 203, the inner ring 2 is positioned to the outer skeleton 4.

[0054] In order to better fix the eccentric shaft, in the specific structure of the protrusion 2021, two groups of contraction slopes are arranged on both sides of the protrusion 2021. The included angle between the two groups of contraction slopes is an included angle b, and the included angle b = 95°±10°.

[0055] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An oil seal for an automobile vacuum pump, characterized in that: It includes an outer ring, an inner ring, and a flexure, one end of the flexure is connected to the top wall of the outer ring, the other end of the flexure is connected to the bottom wall of the inner ring, the flexure and the outer ring form an angle a, which is an acute angle, the outer ring has a protrusion provided with a protrusion, the protrusion is located at the end where the outer ring is connected to the flexure, an outer skeleton is axially embedded in the outer ring, an inner skeleton is axially embedded in the inner ring, and both the outer skeleton and the inner skeleton are annular.

2. The oil seal for an automobile vacuum pump according to claim 1, characterized in that: A first arc surface is provided at a connection between the flexure portion and the outer ring, and a second arc surface is provided at a connection between the flexure portion and the inner ring.

3. The oil seal for an automobile vacuum pump according to claim 1, characterized in that: The thickness of the flexure portion is 1 to 1.5 times the radial length of the outer skeleton, and the angle a is 18±5°.

4. The oil seal for an automobile vacuum pump according to claim 1, characterized in that: The inner ring has a radially protruding assembly ring, and an annular groove is formed on the assembly ring.

5. The oil seal for an automobile vacuum pump according to claim 4, characterized in that: A guiding slope is provided at one end of the outer ring away from the flexing portion, and the guiding slope is gradually inclined from the outer ring wall of the outer ring toward the outer ring wall of the assembly ring.

6. The oil seal for an automobile vacuum pump according to claim 1, characterized in that: One end of the inner ring away from the flexion portion has a radially protruding extension portion, the extension portion is located above the inner skeleton, and the radial length of the extension portion is smaller than the axial length of the inner ring.

7. The oil seal for an automobile vacuum pump according to claim 6, characterized in that: The extension portion has a downwardly protruding block, and a protruding height of the block is 0.5 to 1.2 times the axial thickness of the extension portion.

8. The oil seal for an automobile vacuum pump according to claim 5, characterized in that: The outer ring wall of the outer ring is provided with a plurality of limiting grooves, the limiting grooves are located on the side of the assembly ring away from the guide inclined surface, and a transition inclined surface is provided at the connection between the inner wall of the limiting groove and the outer ring wall of the outer ring.

9. The oil seal for an automobile vacuum pump according to claim 8, characterized in that: The inner ring wall of the outer ring is provided with a plurality of first positioning grooves, and the first positioning grooves are located at an end of the outer skeleton away from the limiting groove.

10. The oil seal for an automobile vacuum pump according to claim 1, characterized in that: The inner ring wall of the inner ring is provided with a plurality of groups of second positioning grooves, and the second positioning grooves are located at one end of the inner skeleton close to the flexing portion.

Images