Shock absorber guider assembly with bidirectional sealing function and shock absorber

Abstract

The utility model discloses a shock absorber guider assembly with a bidirectional sealing function, which comprises a guider, an oil scraping ring, a wave spring and a guide bushing, a stepped groove is arranged on the guider, and an oil scraping groove is arranged at the top of the stepped groove. The outer wall of the oil scraping ring is in clearance fit with the oil scraping groove, and the inner wall of the oil scraping ring is in interference fit with the piston rod. The outer wall of the guide bush is in interference fit with the stepped groove, a wave spring is arranged between the oil scraping ring and the guide bush and is in a compressed state, and the pressure of the wave spring on the oil scraping ring is larger than the sliding friction force between the oil scraping ring and the piston rod. And an exhaust structure is designed on the guider, so that the upper cavity of the working cylinder can be decompressed through exhaust when the shock absorber encounters large damping. Meanwhile, the utility model discloses a shock absorber adopting the shock absorber guider assembly. The inner side of the oil scraping ring is in interference fit with a piston rod. Compared with the prior art, it is guaranteed that oil liquid does not leak in the compression stroke of the shock absorber, the service life of the oil seal is prolonged, and the stability of damping force of the shock absorber is improved.

Description

Technical Field

[0001] The utility model relates to an automobile shock absorber component, in particular to a shock absorber guide assembly with a bidirectional sealing function and a shock absorber adopting the guide assembly. Background Art

[0002] Ride comfort and handling are always important indicators to be considered in automobile design and use. As an important part of the automobile chassis, the shock absorber plays an extremely important role in isolating and attenuating the vibration excitation of the road surface on the vehicle body or the body. Not only that, it can also suppress the roll of the vehicle body when driving on a curve. It has been more than a century since the birth of the shock absorber. The shock absorber has also developed from the initial friction and hydraulic types to today's electrorheological and magnetorheological controllable and adjustable shock absorbers. At present, the annual output of shock absorbers in the world is hundreds of millions, and the commercial value is as high as tens of billions of US dollars.

[0003] In the existing technical solution, the guide assembly used in the shock absorber is composed of a guide, an oil scraper ring, and a guide bushing, which guides the piston rod in the shock absorber and reduces the impact of the internal pressure of the shock absorber on the oil seal.

[0004] Although the existing technical solutions can achieve the stability of the damping force during the recovery stroke of the shock absorber, there are still the following disadvantages:

[0005] 1. During the compression stroke of the shock absorber, due to the interference fit between the oil scraper ring and the piston rod, when the friction force generated by the oil scraper ring and the piston rod is greater than the upward pressure of the oil, the oil scraper ring will move downward with the piston rod, thereby generating a gap between the oil scraper ring and the guide groove, causing oil leakage, affecting the compression damping force of the shock absorber. At the same time, the oil will leak into the upper end of the guide to impact the oil seal, which is prone to excessive pressure and may lead to the risk of oil leakage, air leakage or failure.

[0006] 2. Since the oil scraper ring has no axial positioning in the guide, the oil scraper ring and the piston rod have an interference fit, and the piston rod will move repeatedly with the oil scraper ring, causing the oil scraper ring to continuously bear the impact of the guide, which accelerates the damage of the oil scraper ring and shortens its service life.

[0007] Therefore, a guide with a bidirectional sealing function is needed to manufacture a shock absorber to improve the compression damping force of the shock absorber. Summary of the invention

[0008] The utility model provides a shock absorber guide assembly with a bidirectional sealing function, and at the same time, the utility model also provides a shock absorber using the guide assembly. The utility model is provided with a wave spring to give an upward load to the oil scraper ring, so that it always clings to the top of the oil scraper groove and does not move downward with the piston rod during the compression stroke, so that the seal can always be maintained during the compression stroke, reducing the risk of oil seal leakage, extending the service life of the oil seal, and making the compression damping force of the shock absorber more stable; and the oil scraper ring does not need to bear the impact of the guide, extending the service life.

[0009] For the guide assembly, the technical solution of the utility model is as follows:

[0010] A shock absorber guide assembly with a two-way sealing function comprises a guide, an oil scraper ring, a wave spring and a guide bushing; the guide is provided with a guide through hole for a piston rod to pass through, and the lower side of the guide through hole is provided with a stepped groove, and the oil scraper ring, wave spring and guide bushing are arranged in the stepped groove in sequence from top to bottom; the top of the stepped groove is an oil scraper groove, and the oil scraper ring is arranged in the oil scraper groove; the upper end of the oil scraper ring abuts against the top of the oil scraper groove, and the lower end thereof abuts against the upper end of the wave spring, and the lower end of the wave spring abuts against the upper end of the guide bushing; the outer wall of the oil scraper ring has a clearance fit with the oil scraper groove, and the inner wall size thereof satisfies the requirement of forming an interference fit with the piston rod; the outer wall of the guide bushing has an interference fit with the stepped groove, and the inner wall size thereof satisfies the requirement of forming a clearance fit with the piston rod; the wave spring is in a compressed state, and its pressure on the oil scraper ring is greater than the sliding friction between the oil scraper ring and the piston rod.

[0011] Compared with the prior art, the utility model provides a wave spring between the oil scraper ring and the guide bushing. The wave spring is in a compressed state, and the pressure exerted on the oil scraper ring is greater than the sliding friction between the oil scraper ring and the piston rod. As a result, during the compression stroke of the shock absorber, the oil scraper ring always clings to the top of the oil scraper groove and maintains a sealed state, which can effectively prevent oil leakage, thereby reducing the risk of oil seal leakage, extending the service life of the oil seal, and making the compression damping force of the shock absorber more stable. At the same time, since the oil scraper ring is always pressed by the wave spring, it does not need to withstand the impact of the guide, thereby extending its service life.

[0012] As an optimization, in the aforementioned shock absorber guide assembly with a two-way sealing function, a first ventilation groove is provided on the guide on the outer side of the guide bushing; at the same time, a second ventilation groove is provided on the guide on the upper side of the scraper ring; the first ventilation groove and the second ventilation groove are connected through the gap between the scraper groove and the scraper ring to form an airflow channel; correspondingly, a drainage hole is provided on the guide on the upper side of the guide through hole. Therefore, when encountering large damping, the upper chamber of the working cylinder can be depressurized by exhausting the air, and the above structure is easy to manufacture, which is conducive to industrial implementation.

[0013] Furthermore, the number of the first ventilation grooves may be 3-5, which are evenly distributed on the outer side of the guide bushing along the circumferential direction. Still further, the number of the first ventilation grooves is 3, and the shape is semi-cylindrical.

[0014] Furthermore, the number of the second ventilation grooves is 1 to 3. Furthermore, the number of the second ventilation grooves is 1, and the shape is V-shaped.

[0015] Furthermore, the number of the leakage holes can be 3-5, which are evenly distributed along the circumference of the guide. Still further, the number of the leakage holes is 4.

[0016] For the shock absorber, the technical solution of the utility model is as follows:

[0017] The shock absorber comprises a piston assembly and a guide assembly; the guide assembly is the aforementioned shock absorber guide assembly with a bidirectional sealing function; the piston rod of the piston assembly is clearance-matched with the guide through hole and the guide bushing, and the piston rod of the piston assembly is interference-fitted with the inner side of the oil scraper ring.

[0018] Compared with the prior art, the utility model adopts a shock absorber guide assembly with a two-way sealing function. Since the wave spring gives the oil scraper ring an upward load, when the shock absorber is in a compression stroke, the oil scraper ring will not move downward with the piston rod, so that the oil scraper ring and the oil scraper groove are always in a sealed state, which can effectively prevent oil leakage, thereby reducing the risk of oil seal leakage, extending the service life of the oil seal, and making the compression damping force of the shock absorber more stable; at the same time, since the oil scraper ring is always pressed by the wave spring, it does not need to withstand the impact of the guide, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the shock absorber guide assembly with a bidirectional sealing function (the piston rod that matches it is drawn in the figure for easy understanding);

[0020] Figure 2 It is a structural schematic diagram (section view) of the guide in the utility model.

[0021] Figure 3 It is a structural schematic diagram (stereoscopic diagram) of the guide in the utility model.

[0022] The markings in the accompanying drawings are: 1-guide, 101-guide through hole, 102-oil scraper groove, 103-first ventilation groove, 104-second ventilation groove, 105-drain hole; 2-oil scraper ring; 3-wave spring; 4-guide bushing; 5-piston rod. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments, but they are not used as the basis of the utility model.

[0024] Example (see Figure 1-3 ):

[0025] In this embodiment, the shock absorber adopts a shock absorber guide assembly with a two-way sealing function. When working, not only will the top of the oil scraper ring 2 be tightly attached to the guide 1 during the recovery stroke to maintain a seal, but the oil scraper ring 2 will not move downward with the piston rod 5 during the compression stroke, and will always maintain a sealed state.

[0026] like Figure 1 , Figure 2 As shown, the shock absorber guide assembly with a bidirectional sealing function of the utility model includes a guide 1, an oil scraper ring 2, a wave spring 3, and a guide bushing 4. The guide 1 has a guide through hole 101 for the piston rod to pass through, and the lower side of the guide through hole 101 has a stepped groove. The oil scraper ring 2, the wave spring 3 and the guide bushing 4 are arranged in the stepped groove in sequence from top to bottom.

[0027] The top of the stepped groove is an oil scraping groove 102, and the oil scraping ring 2 is arranged in the oil scraping groove 102. The upper end of the oil scraping ring 2 abuts against the top of the oil scraping groove, and the lower end thereof abuts against the upper end of the wave spring 3, and the lower end of the wave spring 3 abuts against the upper end of the guide bushing 4.

[0028] The outer wall of the oil scraper ring 2 has a clearance fit with the oil scraper groove 102, and the inner wall size is sufficient to form an interference fit with the piston rod 5. The outer wall of the guide bushing 4 has an interference fit with the stepped groove, and the inner wall size is sufficient to form a clearance fit with the piston rod 5. The wave spring 3 is in a compressed state, and its pressure on the oil scraper ring 2 is greater than the sliding friction between the oil scraper ring 2 and the piston rod 5 (the wave spring can provide a larger load than other springs at a certain height).

[0029] When the shock absorber is in compression stroke, the preload force of the wave spring 3 when pressed into the guide 1 gives the oil scraper ring 2 an upward load, and the force provided by the wave spring 3 is greater than the sliding friction between the oil scraper ring 2 and the piston rod 5, so that the upper end surface of the oil scraper ring 2 is always in contact with the top of the oil scraper groove 102 of the guide 1, so the oil cannot flow into the upper side of the guide 1, which can stabilize the compression damping force value, improve the stability of the shock absorber damping force, and at the same time, avoid damage to the oil seal due to excessive internal pressure. In addition, the oil scraper ring 2 will not move downward with the piston rod 5, thereby effectively avoiding the impact of the guide 1 and having a long service life.

[0030] like Figure 3As shown, on the guide 1, three evenly distributed first ventilation grooves 103 are provided on the outer side of the guide bushing 4. At the same time, on the guide 1, a second ventilation groove 104 is provided on the upper side of the oil scraper ring 2. The first ventilation groove 103 and the second ventilation groove 104 are connected through the gap between the oil scraper groove 102 and the oil scraper ring 2 to form an air flow channel. Correspondingly, on the guide 1, four evenly distributed leakage holes 105 are provided on the upper side of the guide through hole 101.

[0031] When the shock absorber encounters a large damping force during the restoring stroke, the piston rod 5 drives the piston to move upward, squeezing the air in the upper chamber of the working cylinder to be discharged upward, and the air passes through the first ventilation groove 103 upward through the gap between the oil scraping groove 102 and the oil scraping ring 2, and then passes through the second ventilation groove 104 upward, and finally flows into the oil storage cylinder through the leakage hole 105. Therefore, when encountering a large damping, the upper chamber of the working cylinder can be depressurized by exhausting the air, and the above structure is easy to manufacture, which is conducive to industrial implementation.

[0032] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.

Claims

1. A shock absorber guide assembly with a bidirectional sealing function, characterized in that: The invention comprises a guide (1), an oil scraper ring (2), a wave spring (3) and a guide bushing (4); the guide (1) has a guide through hole (101) for a piston rod (5) to pass through, and the lower side of the guide through hole (101) has a stepped groove; the oil scraper ring (2), the wave spring (3) and the guide bushing (4) are arranged in the stepped groove in sequence from top to bottom; the top of the stepped groove is an oil scraper groove (102), and the oil scraper ring (2) is arranged in the oil scraper groove (102); the upper end of the oil scraper ring (2) and the top end of the oil scraper groove (102) are aligned with each other. The lower end of the wave spring (3) abuts against the upper end of the wave spring (3), and the lower end of the wave spring (3) abuts against the upper end of the guide bushing (4); the outer wall of the scraper ring (2) has a clearance fit with the scraper groove (102), and the inner wall size is sufficient to form an interference fit with the piston rod (5); the outer wall of the guide bushing (4) has an interference fit with the stepped groove, and the inner wall size is sufficient to form a clearance fit with the piston rod (5); the wave spring (3) is in a compressed state, and the pressure it exerts on the scraper ring (2) is greater than the sliding friction between the scraper ring (2) and the piston rod (5).

2. The shock absorber guide assembly with bidirectional sealing function according to claim 1, characterized in that: A first ventilation groove (103) is provided on the guide (1) on the outer side of the guide bushing (4); at the same time, a second ventilation groove (104) is provided on the guide (1) on the upper side of the oil scraper ring (2); the first ventilation groove (103) and the second ventilation groove (104) are connected through the gap between the oil scraper groove (102) and the oil scraper ring (2) to form an air flow channel; correspondingly, a leakage hole (105) is provided on the guide (1) on the upper side of the guide through hole (101).

3. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the first ventilation grooves (103) is 3-5 and they are evenly distributed on the outer side of the guide bushing (4) along the circumferential direction.

4. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the first ventilation grooves (103) is three and the shape is semi-cylindrical.

5. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the second ventilation grooves (104) is 1-3 and the shape is V-shaped.

6. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the second ventilation groove (104) is one and the shape is V-shaped.

7. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the leakage holes (105) is 3-5 and they are evenly distributed along the circumference of the guide (1).

8. The shock absorber guide assembly with bidirectional sealing function according to claim 2, characterized in that: The number of the leakage holes (105) is 4.

9. A shock absorber, comprising a piston assembly and a guide assembly; characterized in that: The guide assembly is the shock absorber guide assembly with a bidirectional sealing function as described in claim 1; the piston rod (5) of the piston assembly has a clearance fit with the guide through hole (101) and the guide bushing (4), and the piston rod (5) of the piston assembly has an interference fit with the inner side of the oil scraper ring (2).

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