Shock absorber inflation tool and shock absorber inflation structure

Abstract

The utility model belongs to the technical field of automobile shock absorbers, and particularly relates to a shock absorber inflation tool and a shock absorber inflation structure, the shock absorber inflation tool and the shock absorber inflation structure comprise an inflation cylinder, and an inner cavity of the inflation cylinder is of a cylinder structure with two open ends and equal axial diameters; the inflating cylinder body comprises a connecting cylinder section and an inserting cylinder section which are axially adjacent and are coaxially arranged, the inserting cylinder section is of a straight cylinder structure with a smooth outer wall, one end, far away from the connecting cylinder section, of the inserting cylinder section is provided with a leading-in cylinder section, and the outer side wall of the leading-in cylinder section is an annular inclined surface which is obliquely arranged in the direction close to the inserting cylinder section from inside to outside in the radial direction of the leading-in cylinder section; a strip-shaped groove with the length direction arranged in the axial direction of the inflator body is formed in the inner side wall of the inflator body, and the strip-shaped groove penetrates through the end faces of the two ends of the inflator body in the axial direction of the inflator body. The guide slope is arranged on the sealing lip of the shock absorber, so that the lower end of the guide-in barrel section is in contact with the guide slope on the sealing lip and smoothly slides down along the guide slope to be inserted between the sealing lip and the piston rod which are originally tightly attached, and the downward insertion resistance of the inflator barrel is reduced; the guide barrel section of the inflator barrel body is prevented from directly abutting against the upper end face of the sealing lip to scratch the sealing lip, the probability of oil leakage and gas leakage of the shock absorber is reduced, and the yield of the shock absorber is improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive shock absorber technology, specifically relating to a shock absorber inflation fixture and a shock absorber inflation structure. Background Technology

[0002] Automotive shock absorbers are crucial components of a vehicle's suspension system. They utilize the flow of internal fluid between the piston and cylinder to generate damping, absorbing and cushioning vibrations during vehicle operation, thereby improving ride comfort and stability. For example... Figure 1 As shown, a shock absorber generally includes a piston rod 21 and a reservoir 22 spaced out on the outside of the piston rod 21. The inner cavity of the reservoir 22 is a reservoir chamber 23. There is an oil seal between the piston rod 21 and the reservoir 22 to seal the upper port of the reservoir chamber 23. The oil seal includes an annular frame 24 and a rubber sealing lip 25 with an annular structure disposed on the annular frame 24. The rubber sealing lip 25 is located between the annular frame 24 and the shock absorber piston rod 21. The inner wall of the sealing lip 25 is tightly fitted with the outer wall of the piston rod 21 to seal the upper port of the reservoir chamber 23.

[0003] During the operation of the shock absorber, the hydraulic oil in the reservoir 22 is prone to foaming (cavitation), leading to damping idle and discontinuity, thus affecting the damping effect. To solve this problem, nitrogen is introduced into the shock absorber during production to prevent hydraulic oil foaming and improve the shock absorber's damping performance. Currently, the widely used inflation fixtures in shock absorber inflation operations generally include a sealed container and inserts, with the sealed container having a connected inflation chamber and inflation nozzle. The specific structure of the inflation fixture can be found in the inflation fixture for shock absorbers described in Chinese Patent Application No. 200920308301.5 and the inflation device for shock absorbers described in the background art of Chinese Patent Application No. 201220374287.0. When using this type of inflation device to inflate the shock absorber, the insert is first inserted between the shock absorber piston rod 21 and the oil seal, forming an inflation channel between the insert and the piston rod 21. Then, a sealed container is placed over the outside of the piston rod 21, forming a sealed inflation chamber with the shock absorber. The insert is located inside the inflation chamber, which is connected to the inflation channel. During inflation, nitrogen enters the inflation chamber through the inflation nozzle and finally enters the shock absorber's liquid reservoir 23 through the inflation channel. Once the rebound force of the shock absorber piston rod 21 reaches a preset value, the sealed container and insert are removed, completing the shock absorber inflation.

[0004] The inflation process of the above-mentioned inflation fixture requires manual insertion and removal of the inserts from the shock absorber, which wastes manpower and results in low inflation efficiency. To address this, Chinese utility model patent application number 201420611183.6 discloses a dedicated inflation device for shock absorbers, which includes an inflation head connector. The inflation head connector has a central shaft hole and a radial air inlet hole communicating with the central shaft hole. An oil seal assembly is installed on the top of the inflation head connector, and the oil seal assembly is press-fitted to the inflation head connector via an upper threaded cap. An inflation nozzle is connected to the lower end of the inflation head connector; the upper section of the inflation nozzle is a thicker main body section, and the lower section is a thinner inlet section. During inflation, the inflation device presses down onto the piston rod 21 of the shock absorber, causing the inlet section of the inflation nozzle to pass through the oil seal of the shock absorber and enter the inflation chamber. Nitrogen gas enters the inflation head connector through the air inlet and then flows through the gap between the inflation nozzle and the piston rod 21 into the inflation chamber of the shock absorber to complete the inflation. The inflation nozzle moves up and down synchronously with the entire inflation device to insert and pull out of the shock absorber. Although this improves the inflation efficiency of the shock absorber, the thin-walled lower end of the inlet section of the inflation nozzle directly abuts against the upper end face of the sealing lip 25 on the oil seal when inserted into the shock absorber. This results in greater resistance and is prone to scratching the sealing lip 25. The existing inlet section wall thickness is generally above 0.8mm, which is relatively large. When inserted between the piston rod and the sealing lip, it pushes the sealing lip outward, causing a large degree of elastic deformation of the sealing lip. This means that after the inlet section is pulled out of the shock absorber, the rubber sealing lip may not be able to rebound to its original state of tight contact with the piston rod, leading to air and oil leakage from the shock absorber and affecting product quality. In addition, nitrogen can only enter the storage chamber of the storage cylinder through the annular gap between the charging nozzle and the piston rod, resulting in low charging efficiency of the shock absorber. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a shock absorber inflation fixture and shock absorber inflation structure to improve the inflation efficiency of the shock absorber, reduce the probability of scratches on the dust lip of the shock absorber, and improve the product quality of the shock absorber.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a shock absorber inflation fixture, including an inflation cylinder, the inner cavity of which is a cylindrical structure with open ends and equal axial diameter; the inflation cylinder includes a connecting cylinder section and an insertion cylinder section that are axially adjacent and coaxially arranged, the insertion cylinder section is a straight cylinder structure with a smooth outer wall, and the end of the insertion cylinder section away from the connecting cylinder section has an inlet cylinder section, the outer side wall of which is an annular inclined surface that is inclined from the inside to the outside in the radial direction towards the insertion cylinder section;

[0007] The inner wall of the inflatable cylinder has a strip-shaped groove arranged along the axial direction of the inflatable cylinder, and the strip-shaped groove passes through the end faces of both ends of the inflatable cylinder along the axial direction of the inflatable cylinder.

[0008] Furthermore, the strip grooves are provided in multiple ways, with two adjacent strip grooves arranged at intervals.

[0009] Furthermore, the plurality of the strip grooves are evenly distributed along the circumference of the inflatable cylinder.

[0010] Furthermore, the wall thickness of the connecting cylinder section is greater than the wall thickness of the insert cylinder section, and the wall thickness of the insert cylinder section is 0.7 mm.

[0011] A shock absorber inflation structure having any of the above-described shock absorber inflation fixtures includes a shock absorber, the shock absorber including a piston rod and a liquid reservoir sleeved at intervals outside the piston rod, the inner cavity of the liquid reservoir being a liquid storage chamber, and an oil seal between the piston rod and the liquid reservoir for sealing the upper port of the liquid storage chamber, the oil seal including an annular skeleton and a rubber sealing lip with an annular structure disposed on the skeleton, the inner wall of the sealing lip being tightly fitted with the outer wall of the piston rod to seal the liquid storage chamber;

[0012] The inner wall of the upper part of the sealing lip has an annular guide slope that is inclined upward from the inside to the outside. The guide slope is spaced apart from the side wall of the piston rod and forms an annular inlet cavity between them.

[0013] The inflation cylinder is sleeved on the outside of the piston rod with a clearance fit, and the inlet section is located below the insertion section; the outer diameter of the lower end of the inlet section is smaller than the diameter of the upper port of the annular inlet cavity.

[0014] Compared with the prior art, the beneficial effects of this utility model are: it provides a shock absorber inflation fixture, which, by setting a strip groove on the inner side of the inflation cylinder, connects the annular gap between the inflation cylinder and the piston rod during inflation to form an inflation channel, thereby increasing the cross-sectional area of ​​the inflation channel and improving the inflation efficiency of the shock absorber. Even with the wall thickness of the insertion section remaining unchanged, appropriately reducing the inner and outer diameters of the inflation cylinder can still ensure that the cross-sectional area of ​​the inflation channel is not less than that of the original inflation channel, reducing the resistance during the insertion of the inflation cylinder and decreasing the probability of the sealing lip being scratched.

[0015] A shock absorber inflation structure is provided. During the inflation process, the lower end of the inlet cylinder contacts the guide slope on the sealing lip and slides smoothly down the guide slope to insert between the originally tightly fitted sealing lip and piston rod. This reduces the downward insertion resistance of the inflation cylinder, and the guide cylinder and insertion cylinder are inserted into the liquid storage cavity more smoothly. This avoids the guide cylinder of the inflation cylinder directly contacting the upper end face of the sealing lip, which would cause the sealing lip to be scratched. This reduces the probability of oil and air leakage of the shock absorber, improves the sealing performance of the shock absorber, and thus improves the yield rate of the shock absorber. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the upper part of the vibration damper in the background technology;

[0017] Figure 2 This is an axial sectional view of the inflatable tool of this utility model.

[0018] Figure 3 This is an axial cross-sectional view of the air-filled structure of the shock absorber in this utility model.

[0019] Figure 4 yes Figure 3 Enlarged structural diagram of section A in the middle;

[0020] Reference numerals: 1-Inflation cylinder; 11-Strip groove; 12-Connecting cylinder section; 13-Insertion cylinder section; 14-Introduction cylinder section; 2-Shock absorber; 21-Piston rod; 22-Liquid storage cylinder; 23-Liquid storage chamber; 24-Annular skeleton; 25-Sealing lip; 251-Guide slope; 26-Annular introduction cavity. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] As attached Figures 1-4 As shown, a shock absorber inflation fixture includes an inflation cylinder 1. The inner cavity of the inflation cylinder 1 is a cylindrical structure with open ends and equal axial diameters. The inflation cylinder 1 includes a connecting section 12 and an insertion section 13 arranged coaxially and adjacent to each other. The insertion section 13 is a straight cylinder with a smooth outer wall. The end of the insertion section 13 away from the connecting section 12 has an inlet section 14. The outer wall of the inlet section 14 is an annular inclined surface arranged radially from the inside out towards the insertion section 13. The inner wall of the inflation cylinder 1 has a strip groove 11 arranged axially along the length of the inflation cylinder 1, and the strip groove 11 extends through the end faces of both ends of the inflation cylinder 1. The inner diameter of the inflation cylinder 1 should be larger than the outer diameter of the piston rod 21 of the shock absorber 2. The outer diameter of the end of the inlet section 14 near the insertion section 13 is equal to the outer diameter of the insertion section 13, and the lower end face of the inlet section 14 has a smooth transition with its outer wall side, reducing the probability of scratching the sealing lip 25.

[0023] The inflation fixture of this utility model needs to be used in conjunction with an inflation seat having an inflation chamber to form an inflation device. The inflation cylinder 1 is located below the inflation seat, and the connecting cylinder section 12 on the inflation cylinder 1 is sealed to the lower end of the inflation seat so that the inner cavity of the inflation cylinder 1 and the strip groove 11 are connected to the inflation chamber on the inflation seat. Generally, the diameter of the inflation channel on the inflation seat should be greater than or equal to the inner diameter of the inflation cylinder 13. The inflation seat also has an inflation port connected to the inflation chamber. During the inflation operation of the shock absorber, the inflation cylinder 1 and the inflation seat are both sleeved on the outside of the piston rod 21 of the shock absorber 2. The inflation cylinder 1 and the inner wall of the piston rod 21 are in clearance fit. The downward movement of the inflation cylinder 1 causes the inlet cylinder section 14 and the insertion cylinder section 13 to be inserted downward between the sealing lip 25 and the piston rod 21 in sequence. At this time, the annular gap between the inner wall of the inflation cylinder 1 and the piston rod 21 is connected to the strip groove 11 to form an inflation channel. High-pressure nitrogen is then injected into the inflation chamber of the inflation seat, and the high-pressure nitrogen flows through the inflation channel into the liquid storage chamber 23 of the shock absorber 2. When using this inflation fixture, the cross-sectional area of ​​the inflation channel is increased by not setting a strip groove on the inner wall of the inflation cylinder 1, thus improving the inflation efficiency of the shock absorber. Therefore, while keeping the wall thickness of the insertion section 13 at the lower end of the inflation cylinder 1 unchanged, the inner and outer diameters of the inflation cylinder 1 can be appropriately reduced. This ensures that the cross-sectional area of ​​the inflation channel is not less than that of the original inflation channel, thereby reducing the resistance of the sealing lip 25 when the inflation cylinder 1 is inserted, reducing the probability of the sealing lip 25 being scratched, and reducing the degree of deformation caused by compression. This further ensures the sealing fit between the rubber sealing lip 25 and the piston rod 21 after the rubber sealing lip rebounds after inflation, improving the yield rate of the shock absorber.

[0024] The strip groove 11 can be a V-shaped groove, a U-shaped groove, or a semi-circular groove, etc. One or more strip grooves 11 can be provided. To further improve the inflation efficiency of the shock absorber, preferably, multiple strip grooves 11 are provided, with adjacent strip grooves 11 spaced apart. Because the wall of the insertion cylinder section 13 is relatively thin, to avoid uneven distribution of the strip grooves 11 on the insertion cylinder section 13 leading to uneven strength distribution of the cylinder wall and deformation or damage during insertion and removal of the insertion cylinder section 13 from the shock absorber, as a further preferred embodiment, multiple strip grooves 11 are evenly distributed around the circumference of the inflation cylinder 1, ensuring a uniform structure of the insertion cylinder section 13 and improving its reliability.

[0025] The wall thicknesses of the connecting section 12 and the insertion section 13 can be the same or different. Considering that the connecting section 12 needs to be connected to the inflation seat, if the wall of the connecting section 12 is too thin, it is prone to deformation. Generally, the wall thickness of the connecting section 12 is greater than the wall thickness of the insertion section 13. The thickness of the insertion section is generally between 0.8-0.9 mm. Preferably, the wall thickness of the insertion section 13 is 0.7 mm. While ensuring the strength of the insertion section 13, its wall thickness is reduced as much as possible to reduce the degree of compression on the sealing lip 25 during the inflation operation, reduce the degree of deformation of the sealing lip 25, and ensure that the sealing lip 25 seals with the piston rod 21 after rebounding.

[0026] A shock absorber inflation structure having any of the above-described shock absorber inflation fixtures includes a shock absorber 2. The shock absorber 2 includes a piston rod 21 and a liquid reservoir 22 spaced outside the piston rod 21. The inner cavity of the liquid reservoir 22 is a liquid reservoir 23. An oil seal is provided between the piston rod 21 and the liquid reservoir 22 to seal the upper port of the liquid reservoir 23. The oil seal includes an annular frame 24 and an annular rubber sealing lip 25 disposed on the frame 24. The inner wall of the sealing lip 25 is flush with the piston rod 21. The outer wall tightly seals the liquid storage cavity 23; the inner side wall of the upper part of the sealing lip 25 has an annular guide slope 251 arranged from the inside out and upward, the guide slope 251 and the side wall of the piston rod 21 are spaced apart and form an annular inlet cavity 26 between them; the inflation cylinder 1 is sleeved on the outside of the piston rod 21 and the two are in clearance fit, the inlet cylinder section 14 is located below the insertion cylinder section 13; the outer diameter of the lower end of the inlet cylinder section 14 is smaller than the diameter of the upper port of the annular inlet cavity 26.

[0027] During the inflation process of the shock absorber, the lower end of the inlet section 14 is first inserted into the annular inlet cavity 26, with a clearance fit between the inlet section 14 and the upper end of the annular inlet cavity 26. As the inflation cylinder 1 moves downward, the lower end of the inlet section 14 contacts the guide slope 251 on the sealing lip 25 and smoothly slides down along the guide slope 251 into the space between the originally tightly fitted sealing lip 25 and the piston rod 21. This reduces the downward resistance of the inflation cylinder 1, allowing the guide section 14 and the insertion section 13 to be inserted more smoothly into the liquid storage cavity 23. This avoids direct contact between the guide section 14 of the inflation cylinder 1 and the upper end face of the sealing lip 15, which could cause the sealing lip 15 to be scratched. This reduces the probability of oil and air leakage from the shock absorber and improves the yield rate of the shock absorber.

[0028] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

[0029] In the description of this utility model, the terms "upper," "lower," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

Claims

1. A shock absorber inflation tool, comprising an inflation cylinder (1), the inner cavity of the inflation cylinder (1) being a cylindrical structure with open ends and equal axial diameter; the inflation cylinder (1) comprising a connecting cylinder segment (12) and an insertion cylinder segment (13) arranged axially adjacent and coaxially, the insertion cylinder segment (13) being a straight cylinder structure with smooth outer wall, the insertion cylinder segment (13) having a leading-in cylinder segment (14) at the end away from the connecting cylinder segment (12), the outer side wall of the leading-in cylinder segment (14) being an annular inclined surface arranged from inside to outside along the radial direction thereof towards the insertion cylinder segment (13); characterized in that: the inner side wall of the inflation cylinder (1) has strip-shaped grooves (11) arranged along the axial direction of the inflation cylinder (1), the strip-shaped grooves (11) penetrating through the end faces of the two ends of the inflation cylinder (1) along the axial direction of the inflation cylinder (1).

2. The shock absorber inflation tool of claim 1, wherein: The strip-shaped grooves (11) are provided in plurality, and two adjacent strip-shaped grooves (11) are arranged at intervals.

3. The shock absorber inflation tool of claim 2, wherein: The plurality of strip-shaped grooves (11) are uniformly distributed along the circumferential direction of the inflation cylinder (1).

4. The shock absorber inflation tool of claim 3, wherein: The wall thickness of the connecting cylinder segment (12) is greater than the wall thickness of the insertion cylinder segment (13), and the wall thickness of the insertion cylinder segment (13) is 0.7 mm.

5. A shock absorber inflation structure having the shock absorber inflation tool as claimed in any one of claims 1-4, comprising a shock absorber (2), the shock absorber (2) comprising a piston rod (21) and a reservoir (22) arranged at intervals outside the piston rod (21), the inner cavity of the reservoir (22) being a liquid storage cavity (23), the piston rod (21) and the reservoir (22) having an oil seal sealing the upper port of the liquid storage cavity (23) therebetween, the oil seal comprising an annular skeleton (24) and an annular structure rubber sealing lip (25) arranged on the annular skeleton (24), the inner wall of the sealing lip (25) being tightly attached to the outer wall of the piston rod (21) to seal the liquid storage cavity (23); characterized in that: the inner side wall of the upper part of the sealing lip (25) has an annular guide slope surface (251) arranged from inside to outside and upward, the guide slope surface (251) being arranged at intervals with the side wall of the piston rod (21) and forming an annular leading-in cavity (26) therebetween; the inflation cylinder (1) is arranged outside the piston rod (21) with clearance fit therebetween, the leading-in cylinder segment (14) being located below the insertion cylinder segment (13); the outer diameter of the lower end of the leading-in cylinder segment (14) being smaller than the caliber of the upper port of the annular leading-in cavity (26).

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