Oil seal guider assembly and double-cylinder shock absorber
By setting an inclined assembly of an annular boss and an oil seal check lip on the check end surface of the guide of the double-bar shock absorber, the gap is filled with oil, which solves the gas passing and noise problems caused by the matching gap between the guide and the oil seal, and achieves better sealing performance and damping effect.
Patent Information
- Application Number
- CN202421842776.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In existing double-cylinder shock absorbers, there is a gap between the check end surface of the guide and the check lip of the oil seal, causing gas to pass through, affecting damping performance and generating noise.
By setting an annular boss on the check end surface of the guide to form an oil storage tank, and the check lip of the oil seal is tilted on the check end surface, the gap is filled with oil, and one-way sealing fit is achieved, and friction and vibration are reduced through the oil during the stretching stroke of the vibration absorber.
Effectively eliminates the matching gap between the guide and the oil seal, enhances the sealing performance of the shock absorber, avoids noise generation, and improves damping performance.
Smart Images
Figure CN222863961U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shock absorbers, in particular to an oil seal guide assembly and a double-tube shock absorber. Background Art
[0002] In a double-tube shock absorber, the guide is mounted on the top of the outer tube and the inner tube for the connecting rod to pass through and extend into the inner tube. The side wall of the guide is provided with a side wall through hole. During the extension stroke of the shock absorber, the gas in the upper working chamber of the inner tube enters the oil storage chamber between the inner tube and the outer tube through the side wall through hole to relieve the pressure in the upper working chamber.
[0003] In order to prevent the gas in the oil storage chamber from entering the upper working chamber during the compression stroke of the shock absorber, a check end face connected to the side wall through hole is usually provided on the guide, and the check end face cooperates with the check lip of the oil seal assembled above it to realize the function of a one-way valve.
[0004] However, the current cooperation between the guide and the oil seal has the following problems:
[0005] On the one hand, there is a gap between the check end face of the guide and the check lip of the oil seal, which allows a small amount of gas to pass through, affecting the damping performance of the twin-tube shock absorber and easily causing foaming of the upper working chamber due to the gas in the oil storage chamber entering the upper working chamber during the compression stroke of the shock absorber.
[0006] On the other hand, during the stretching stroke of the shock absorber, the gas in the upper working chamber will generate noise when passing through the gap between the check lip and the check end face at a certain speed, affecting the driving comfort.
[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0008] In view of this, the utility model provides an oil seal guide assembly and a double-tube shock absorber. By improving the cooperation between the guide and the oil seal, the cooperation clearance between the non-return end face of the guide and the non-return lip of the oil seal is effectively eliminated, so that the non-return end face and the non-return lip are only connected in the extension stroke of the shock absorber and closed in the compression stroke of the shock absorber, thereby solving the problem of poor one-way sealing cooperation between the non-return end face and the non-return lip; and the non-return end face and the non-return lip are sealed with the help of oil and friction and vibration are suppressed, effectively solving the problem of noise generated in the extension stroke of the shock absorber.
[0009] According to one aspect of the utility model, an oil seal guide assembly is provided, comprising a guide and an oil seal, wherein the guide is provided with a connecting rod through hole and a check end face, the check end face is connected to the side wall through hole of the guide, the oil seal is arranged axially above the check end face, and the check lip of the oil seal abuts the check end face; wherein: annular bosses are respectively provided on the inner edge and the outer edge of the check end face, an oil storage tank is formed between the two circles of annular bosses, and oil is stored in the oil storage tank; the check lip is inclined toward the central axis of the guide, and the oil in the oil storage tank fills the fitting gap between the check lip and the check end face, so that the check lip and the check end face are fitted in a one-way sealing manner.
[0010] In some embodiments, the included angle between the check lip and the check end surface is less than 45°, and the included angle between the check lip and the body of the oil seal is between 60° and 90°.
[0011] In some embodiments, the height of the annular boss along the axial direction is between 0.4 mm and 0.6 mm.
[0012] In some embodiments, the cross-sectional shape of the annular boss is formed into an arc shape.
[0013] In some embodiments, the oil seal guide assembly also includes: a bushing, which is pressed into the connecting rod through hole; an oil scraper ring, the inner wall of the connecting rod through hole is formed with a step surface, the oil scraper ring is pressed into the connecting rod through hole, the bushing presses the oil scraper ring against the step surface, and the oil scraper ring is used to fit tightly with the connecting rod; wherein the inner wall of the connecting rod through hole is also provided with a groove interconnected with the connecting rod through hole, the groove includes a first section formed between the oil scraper ring and the inner wall of the connecting rod through hole and a second section formed between the bushing and the inner wall of the connecting rod through hole.
[0014] In some embodiments, the bushing presses the oil scraper ring against the step surface via a wave spring.
[0015] In some embodiments, the grooves are evenly distributed along the circumferential direction on the inner wall of the connecting rod through hole.
[0016] In some embodiments, the diameter of the groove is between 0.3 mm and 1 mm, and the number of the grooves is 3 to 5.
[0017] In some embodiments, the material of the oil scraper ring includes polytetrafluoroethylene.
[0018] According to another aspect of the utility model, a twin-tube shock absorber is provided, wherein the twin-tube shock absorber is equipped with an oil seal guide assembly as described in any of the above embodiments.
[0019] Compared with the prior art, the beneficial effects of the present invention include at least:
[0020] An oil storage tank for storing oil is formed by two circles of annular bosses arranged on the inner and outer edges of the check end face; the oil seal is arranged axially above the check end face, the check lip abuts the check end face, and the check lip is inclined toward the central axis of the guide, so that the check lip as a whole abuts the check end face in an inwardly inclined manner, which helps to open the check lip during the extension stroke of the shock absorber to allow the gas in the upper working chamber to enter the oil storage chamber through the channel between the check lip and the check end face and the side wall through hole of the guide; and during the compression stroke of the shock absorber, the check lip seal abuts the check end face to realize the one-way valve function.
[0021] Furthermore, the oil stored in the oil storage tank fills the fitting gap between the check lip and the check end face, so that the check lip and the check end face fit tightly, thereby enhancing the sealing and checking ability of the check lip in the compression stroke of the shock absorber; and in the extension stroke of the shock absorber, the oil can reduce the friction and vibration between the gas and the check lip and the check end face, ensuring that the gas does not generate excessive noise when passing through the channel between the check lip and the check end face.
[0022] Therefore, the utility model improves the matching between the guide and the oil seal, effectively eliminates the matching gap between the non-return end face of the guide and the non-return lip of the oil seal, so that the non-return end face and the non-return lip are only connected in the extension stroke of the shock absorber and closed in the compression stroke of the shock absorber, thereby solving the problem of poor one-way sealing matching effect between the non-return end face and the non-return lip, avoiding affecting the damping performance of the double-tube shock absorber, and avoiding the foaming of the upper working chamber caused by the gas in the oil storage chamber entering the upper working chamber during the compression stroke of the shock absorber. In addition, the non-return end face and the non-return lip are sealed with the help of oil to suppress friction and vibration, effectively solving the problem of noise generated in the extension stroke of the shock absorber.
[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 A schematic structural diagram of an oil seal guide assembly in an embodiment of the utility model is shown. DETAILED DESCRIPTION
[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.
[0027] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar structures, and thus their repeated description will be omitted.
[0028] The words "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. The orientation or positional relationship indicated by the terms "upper" and "lower" etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model. The term "plurality" means two or more, unless otherwise clearly and specifically defined. In addition, in the description of the present utility model, when it is said that a device is "connected" to another device, this includes not only the case of direct connection, but also the case of indirect connection through other elements.
[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in different embodiments may be combined with each other.
[0030] The figure shows the structure of the oil seal guide assembly in the embodiment of the utility model, referring to Figure 1 As shown, the oil seal guide assembly provided by the embodiment of the utility model includes:
[0031] The guide 10 and the oil seal 20, the guide 10 is provided with a connecting rod through hole 11 and a non-return end surface 12, the non-return end surface 12 is connected to the side wall through hole 13 of the guide 10, the oil seal 20 is assembled axially above the non-return end surface 12, and the non-return lip 22 of the oil seal 20 abuts against the non-return end surface 12; wherein:
[0032] The inner edge and the outer edge of the non-return end surface 12 are respectively provided with an annular boss 120, and an oil storage tank is formed between the two circles of annular bosses 120, and oil is stored in the oil storage tank;
[0033] The check lip 22 is inclined toward the center axis Z of the guide 10 , and the oil in the oil reservoir fills the matching gap between the check lip 22 and the check end face 12 , so that the check lip 22 and the check end face 12 are matched in a one-way sealing manner.
[0034] An oil storage tank for storing oil is formed by two circles of annular bosses 120 arranged on the inner and outer edges of the check end face 12; the oil seal 20 is assembled axially above the check end face 12, the check lip 22 abuts against the check end face 12, and the check lip 22 is inclined toward the central axis of the guide 10, so that the check lip 22 as a whole abuts against the check end face 12 in an inwardly inclined manner, which helps to open the check lip 22 during the extension stroke of the shock absorber to allow the gas in the upper working chamber to enter the oil storage chamber through the channel between the check lip 22 and the check end face 12 and the side wall through hole 13 of the guide 10, and in the compression stroke of the shock absorber, the check lip 22 seals against the check end face 12 to realize the one-way valve function.
[0035] It should be noted that the gas / oil replenishment of the upper working chamber is achieved through other valve systems of the twin-tube shock absorber, and the present utility model does not impose any limitation on this.
[0036] Furthermore, the oil stored in the oil storage tank fills the fitting gap between the check lip 22 and the check end face 12, so that the check lip 22 and the check end face 12 fit tightly, thereby enhancing the sealing and checking ability of the check lip 22 in the compression stroke of the shock absorber; and in the extension stroke of the shock absorber, the oil can reduce the friction and vibration between the gas and the check lip 22 and the check end face 12, ensuring that the gas does not generate excessive noise when passing through the channel between the check lip 22 and the check end face 12.
[0037] Therefore, the utility model improves the matching between the guide 10 and the oil seal 20, effectively eliminates the matching clearance between the check end face 12 of the guide 10 and the check lip 22 of the oil seal 20, so that the check end face 12 and the check lip 22 are only connected in the extension stroke of the shock absorber and closed in the compression stroke of the shock absorber, thereby solving the problem of poor one-way sealing matching effect between the check end face 12 and the check lip 22, avoiding affecting the damping performance of the twin-tube shock absorber, and avoiding the foaming of the upper working chamber caused by the gas in the oil storage chamber entering the upper working chamber during the compression stroke of the shock absorber. In addition, the check end face 12 and the check lip 22 are sealed with the help of oil to suppress friction and vibration, effectively solving the problem of noise generated in the extension stroke of the shock absorber.
[0038] In some embodiments, the included angle α1 between the check lip 22 and the check end surface 12 is less than 45°, and the included angle α2 between the check lip 22 and the body 25 of the oil seal 20 is between 60° and 90°.
[0039] By setting the angle α1 and the angle α2, the sealing and non-return ability of the check lip 22 can be enhanced, and the check lip 22 can be prevented from turning inward, ensuring that the check lip 22 is opened during the extension stroke of the shock absorber to allow the gas in the upper working chamber to enter the oil storage chamber through the channel between the check lip 22 and the check end face 12 and the side wall through hole 13 of the guide 10, while in the compression stroke of the shock absorber, the check lip 22 seals against the check end face 12 to realize the one-way valve function.
[0040] Of course, according to different models of twin-tube shock absorbers, different damping performance requirements and other factors, the specific values of the angle α1 and the angle α2 can be adaptively adjusted without being limited to the above-mentioned examples, as long as the check end face 12 and the check lip 22 can be connected only in the extension stroke of the shock absorber and closed in the compression stroke of the shock absorber.
[0041] In some embodiments, the height of the annular boss 120 along the axial direction is between 0.4 mm and 0.6 mm. By setting the height of the annular boss 120, the oil reservoir stores appropriate oil, so that the oil fills the matching gap between the check lip 22 and the check end face 12 during the compression stroke of the shock absorber, and suppresses the friction and vibration between the gas and the check lip 22 and the check end face 12 during the extension stroke of the shock absorber.
[0042] According to different models of twin-tube shock absorbers, different damping performance requirements and other factors, the height of the annular boss 120 can also be adaptively adjusted without being limited to the above-mentioned ones, as long as it can prevent the passage of gas during the compression stroke of the shock absorber and suppress the friction vibration noise during the extension stroke of the shock absorber.
[0043] In some embodiments, the cross-sectional shape of the annular boss 120 is formed in an arc shape, which helps to alleviate the vibration and impact of the gas passing through, thereby reducing the working noise of the twin-tube shock absorber.
[0044] In some embodiments, the oil seal guide assembly also includes: a bushing 30, which is pressed into the connecting rod through hole 11; an oil scraper ring 50, the inner wall of the connecting rod through hole 11 is formed with a step surface, the oil scraper ring 50 is pressed into the connecting rod through hole 11, the bushing 30 presses the oil scraper ring 50 against the step surface, and the oil scraper ring 50 is used to fit tightly with the connecting rod; wherein, the inner wall of the connecting rod through hole 11 is also provided with a groove interconnected with the connecting rod through hole 11, the groove includes a first section 61 formed between the oil scraper ring 50 and the inner wall of the connecting rod through hole 11 and a second section 62 formed between the bushing 30 and the inner wall of the connecting rod through hole 11.
[0045] In the current twin-tube shock absorber, in addition to the loose fit between the guide and the oil seal, there is also a problem of large clearance between the oil scraper ring and the connecting rod, which causes unstable oil flow when the twin-tube shock absorber moves at low speed.
[0046] The oil seal guide assembly design of the utility model makes the scraper ring 50 fit tightly with the connecting rod, thereby playing a role in eliminating foaming during the reciprocating motion of the connecting rod, especially being able to eliminate the foaming problem during the violent motion of the twin-tube shock absorber, thereby improving the damping performance of the twin-tube shock absorber. In addition, due to the tight fit between the scraper ring 50 and the connecting rod, the oil can only flow through the grooves (including the first section 61 and the second section 62) of the guide 10, so that the damping force of the twin-tube shock absorber in the low-speed motion state can be guaranteed.
[0047] In some embodiments, the bushing 30 presses the oil scraper ring 50 against the step surface through the wave spring 60. The wave spring 60 can provide a stable elastic force to press the oil scraper ring 50 against the step surface and make the oil scraper ring fit tightly with the connecting rod to prevent the oil scraper ring 50 from loosening.
[0048] In some embodiments, the grooves are evenly distributed along the circumferential direction on the inner wall of the connecting rod through hole 11. In this way, the oil in the upper working chamber flows through the grooves evenly distributed around the circumference, thereby achieving a uniform and stable damping effect.
[0049] In some embodiments, the diameter of the groove is between 0.3 mm and 1 mm, and the number of the grooves is between 3 and 5. By setting the diameter and number of the grooves, the twin-tube shock absorber can provide the required damping force and ensure the stability of the damping force.
[0050] According to different models of twin-tube shock absorbers, different damping performance requirements and other factors, the diameter and number of the grooves can be adaptively adjusted, but are not limited to the above-mentioned ones.
[0051] In some embodiments, the material of the oil scraper ring 50 includes polytetrafluoroethylene (PTFE). The material of the oil scraper ring 50 is mainly PTFE, which can achieve the effect of reducing friction.
[0052] The embodiment of the utility model further provides a double-tube shock absorber, which is equipped with an oil seal guide assembly as described in any of the above embodiments, and can achieve the following beneficial effects:
[0053] By improving the matching between the guide 10 and the oil seal 20, the matching clearance between the check end face 12 of the guide 10 and the check lip 22 of the oil seal 20 is effectively eliminated, so that the check end face 12 and the check lip 22 are only connected in the extension stroke of the shock absorber and closed in the compression stroke of the shock absorber, thereby solving the problem of poor one-way sealing matching effect between the check end face 12 and the check lip 22, avoiding affecting the damping performance of the twin-tube shock absorber, and avoiding the foaming of the upper working chamber caused by the gas in the oil storage chamber entering the upper working chamber during the compression stroke of the shock absorber. In addition, the check end face 12 and the check lip 22 are sealed with the help of oil to suppress friction and vibration, effectively solving the problem of noise generated in the extension stroke of the shock absorber.
[0054] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. An oil seal guide assembly, comprising a guide and an oil seal, wherein the guide is provided with a connecting rod through hole and a check end surface, the check end surface is connected to a side wall through hole of the guide, the oil seal is arranged axially above the check end surface, and the check lip of the oil seal abuts against the check end surface; Features: The inner edge and the outer edge of the non-return end surface are respectively provided with annular bosses, and an oil storage tank is formed between the two circles of annular bosses, and the oil storage tank stores oil; The check lip is inclined toward the central axis of the guide, and the oil in the oil storage tank fills the matching gap between the check lip and the check end face, so that the check lip and the check end face are matched in a one-way sealing manner.
2. The oil seal guide assembly according to claim 1, characterized in that: The included angle between the non-return lip and the non-return end surface is less than 45°, and the included angle between the non-return lip and the body of the oil seal is between 60° and 90°.
3. The oil seal guide assembly according to claim 1, characterized in that: The height of the annular boss along the axial direction is between 0.4 mm and 0.6 mm.
4. The oil seal guide assembly according to claim 1, characterized in that: The cross-sectional shape of the annular boss is formed in an arc shape.
5. The oil seal guide assembly according to claim 1, characterized in that: Also includes: A bushing, press-fitted into the connecting rod through hole; An oil scraper ring, wherein the inner wall of the connecting rod through hole is formed with a step surface, the oil scraper ring is pressed into the connecting rod through hole, the bushing presses the oil scraper ring against the step surface, and the oil scraper ring is used to fit tightly with the connecting rod; Wherein, the inner wall of the connecting rod through hole is also provided with a groove interconnected with the connecting rod through hole, and the groove includes a first section formed between the oil scraper ring and the inner wall of the connecting rod through hole and a second section formed between the bushing and the inner wall of the connecting rod through hole.
6. The oil seal guide assembly according to claim 5, characterized in that: The bushing presses the oil scraper ring against the step surface through a wave spring.
7. The oil seal guide assembly according to claim 5, characterized in that: The grooves are evenly distributed along the circumferential direction on the inner wall of the connecting rod through hole.
8. The oil seal guide assembly according to claim 5, characterized in that: The diameter of the groove is between 0.3 mm and 1 mm, and the number of the grooves is between 3 and 5.
9. The oil seal guide assembly according to claim 5, characterized in that: The material of the oil scraper ring includes polytetrafluoroethylene.
10. A double-tube shock absorber, characterized in that: The twin-tube shock absorber is equipped with an oil seal guide assembly as described in any one of claims 1-9.