Inflatable structure shock absorber

Abstract

The utility model discloses a shock absorber with an inflatable structure, which relates to the field of suspension shock absorbers for vehicles and comprises a piston rod, an oil storage barrel and a working cylinder, the oil storage barrel is sleeved outside the working cylinder, a bottom cover is mounted at the rear end of the oil storage barrel, a bottom valve is mounted at the rear end of the working cylinder, and a piston component is mounted at the tail of the piston rod and then mounted from the front end of the working cylinder. A guider is arranged at the front end of the oil storage barrel, the guider and the opening part of the working cylinder are matched and sealed, an oil seal is arranged at the front end of the guider, and the oil seal and the guider are pressed tightly after the opening part of the oil storage barrel is flanged; an opening part, close to one side of the guider, of the oil storage barrel is expanded to form an inflation hole for inflating the oil storage barrel before the oil seal is pressed; the piston rod is further provided with an inner buffer block and a limiting block. The oil seal is more friendly during product production, the failure probability of the oil seal is further reduced, and the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of vehicle suspension shock absorbers, and particularly relates to a shock absorber with an inflation structure. Background Art

[0002] At present, the inflation method for car shock absorbers is to inflate through a plastic pin along the edge of the piston rod through the oil seal after the shock absorber oil storage cylinder is sealed. The disadvantages of this method of sealing first and then inflating are as follows:

[0003] 1. When the pin is inserted into the oil seal, there is a chance of causing the failure of the oil seal lip, resulting in oil leakage and air leakage, causing the shock absorber to fail and affecting the driving experience of vehicle driving;

[0004] 2. When it is found during production inflation that the gas force of the shock absorber after inflation is too large, a longer pin is needed to deflate the shock absorber, which has a chance of causing the failure of the oil seal lip, resulting in oil leakage and air leakage, causing the shock absorber to fail and affecting the driving experience of vehicle driving.

[0005] In addition, Chinese patent document (CN102116355A) discloses a shock absorber inflation and sealing process method. Before the oil seal is pressed, an inflation hole is drilled on one side of the barrel wall of the shock absorber oil storage cylinder, and then the oil seal is pre-pressed to a position outside the inflation hole, and then inflated. After the gas is filled, the oil seal is pressed and sealed in place in the inflated state. However, drilling holes in the oil storage cylinder wall makes the oil storage cylinder have convex holes and burrs. When the shock absorber is flanged after inflation, it is easy for the burrs to fall off and enter the oil seal, resulting in the failure of the oil seal; multiple holes in the barrel wall will also lead to a decline in mechanical properties, and if the burrs are not properly processed, it is easy to cause scratches to the operators. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and provide a shock absorber with an inflation structure, which is more friendly to the oil seal during product production, further reduces the probability of oil seal failure, and improves the service life of the product.

[0007] The purpose of the utility model is completed through the following technical solutions: This shock absorber with an inflation structure includes a piston rod, an oil storage cylinder and a working cylinder. The oil storage cylinder is sleeved outside the working cylinder. The bottom cover is installed at the rear end of the oil storage cylinder, the bottom valve is installed at the rear end of the working cylinder. After the piston assembly is installed at the tail of the piston rod, it is inserted into the front end of the working cylinder and slides relative to the working cylinder. A guide is arranged at the front end of the oil storage cylinder, and the guide is matched and sealed with the mouth of the working cylinder. An oil seal is arranged at the front end of the guide. After the mouth of the oil storage cylinder is flanged, the oil seal and the guide are pressed tightly; an inflation hole is formed by expanding the mouth of the oil storage cylinder near the guide for inflating the oil storage cylinder before the oil seal is pressed; an inner buffer block and a limit block are also installed on the piston rod.

[0008] As a further technical solution, the position of the inflation hole is set above the final press-fitting position of the oil seal.

[0009] As a further technical solution, the angle α formed by the outer wall of the inflation hole relative to the outer wall of the oil storage cylinder is 8°.

[0010] As a further technical solution, the angle β formed by the two side edges of the mouth of the inflation hole is 112°.

[0011] As a further technical solution, the depth H of the inflation hole is 3 mm.

[0012] As a further technical solution, the width D of the inflation hole is 1.5 mm.

[0013] As a further technical solution, the length L1 of the opening of the inflation hole is 7.6 mm, and the length L2 of the narrowed part of the inflation hole is 2.3 mm.

[0014] As a further technical solution, a U-shaped bracket is fixed on the bottom cover.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. An inflation hole is formed by expanding the mouth of the oil storage cylinder instead of directly drilling a hole, which has less impact on the overall structural strength of the oil storage cylinder, and the hole expanding process is relatively simpler and the production cost is lower;

[0017] 2. When inflating using the inflation hole, the oil seal will not be damaged, avoiding the failure of the oil seal lip, improving the service life of the product, and reducing the defective rate of the product;

[0018] 3. After the product is detected as unqualified, it can be re-inflated and deflated through the inflation hole without damaging the oil seal, avoiding the failure of the shock absorber;

[0019] 4. The position of the inflation hole is set above the final press-fitting position of the oil seal to ensure the sealing effect of the oil seal and prevent oil from leaking out through the inflation hole. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the shock absorber during inflation in the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the shock absorber during pre-sealing in the present utility model.

[0022] Figure 3 It is a schematic structural diagram of the shock absorber during flanging and sealing in the present utility model.

[0023] Figure 4 It is a schematic structural diagram of the oil storage cylinder in the present utility model.

[0024] Figure 5 is Figure 4 the left view of

[0025] Explanation of reference numerals: piston rod 1, oil seal 2, guide 3, inner buffer block 4, limit block 5, piston assembly 6, oil storage cylinder 7, working cylinder 8, bottom cover 9, bottom valve 10, U-shaped bracket 11, inflation hole 12. Specific embodiments

[0026] The following will introduce the present utility model in detail with reference to the accompanying drawings:

[0027] Embodiment: As shown in the attached Figures 1 to 5 figures, this inflation-structured shock absorber includes a piston rod 1, an oil seal 2, a guide 3, an inner buffer block 4, a limit block 5, a piston assembly 6, an oil storage cylinder 7, a working cylinder 8, a bottom cover 9, a bottom valve 10, a U-shaped bracket 11, and an inflation hole 12.

[0028] Referring to the attached Figure 1 figures, during assembly, the oil storage cylinder 7 is sleeved outside the working cylinder 8, the bottom cover 9 is installed at the rear end of the oil storage cylinder 7, the bottom valve 10 is installed at the rear end of the working cylinder 8, the piston assembly 6 is installed at the tail of the piston rod 1 and then inserted into the front end of the working cylinder 8 and slides relative to the working cylinder 8. A guide 3 is provided at the front end of the oil storage cylinder 7, and the guide 3 is in sealing cooperation with the mouth of the working cylinder 8. An oil seal 2 is provided at the front end of the guide 3. As shown in Figure 2 , 3 figures, after the flanging of the mouth of the oil storage cylinder 7, the oil seal 2 and the guide 3 are pressed tightly. As shown in Figure 1 , 4 , 5, an inflation hole 12 is formed by expanding the mouth of the oil storage cylinder 7 on the side close to the guide 3. The inflation hole 12 can inflate the oil storage cylinder 7 before the press-fitting of the oil seal 2. In addition, an inner buffer block 4 and a limit block 5 are also installed on the piston rod 1, and a U-shaped bracket 11 is also fixed on the bottom cover 9.

[0029] Furthermore, setting the position of the inflation hole 12 above the final press-fitting position of the oil seal 2 can ensure the sealing effect of the oil seal 2 and prevent the oil from leaking out through the inflation hole 12.

[0030] Preferably, as shown in Figure 4 , 5 figures, the angle α formed by the outer wall of the inflation hole 12 relative to the outer wall of the oil storage cylinder 7 is 8°, the angle β formed by the two side edges of the mouth of the inflation hole 12 is 112°, the depth H of the inflation hole 12 is 3 mm, the width D of the inflation hole 12 is 1.5 mm, the length L1 of the opening of the inflation hole 12 is 7.6 mm, and the length L2 of the narrowed part of the inflation hole 12 is 2.3 mm.

[0031] Working process of the present utility model:

[0032] 1) Before press-fitting the oil seal 2, first expand an inflation hole 12 at the upper port of the oil storage cylinder 7, and the length position of the hole is set above the final press-fitting position of the oil seal 2;

[0033] 2) Assemble the shock absorber components:

[0034] The piston rod assembly consists of: the piston rod 1, the oil seal 2, the guide 3, the inner buffer block 4, the limit block 5 and the piston assembly 6;

[0035] The working cylinder assembly: consists of the working cylinder 8 and the bottom valve 10 through press-fitting;

[0036] The oil storage cylinder assembly: consists of the oil storage cylinder 7, the bottom cover 9 and the U-shaped bracket 11 through welding;

[0037] As Figure 1 shown, inflate the assembled shock absorber: first put the working cylinder assembly into the oil storage cylinder assembly, then inject oil, then put the piston rod assembly into the working cylinder, and finally raise the piston assembly to a certain height and inflate through the inflation hole 12;

[0038] 3) Detect whether the gas pressure is qualified: After inflation is completed, press-fit the oil seal 2 and the guide 3 on the piston rod assembly in place, and perform gas pressure detection. If it is qualified, proceed to the next step; if it is unqualified, raise the assembly to a certain height again and deflate through the inflation hole 12. After deflation is completed, inflate again and detect the gas pressure;

[0039] 4) Pre-seal. After the product gas pressure is detected to be qualified, perform three-point riveting, as Figure 2 shown;

[0040] 5) Flange-seal the oil storage cylinder 7, press the oil seal 2 and the guide 3 tightly, and the product after flanging is as Figure 3 shown.

[0041] Term Explanation:

[0042] Shock absorber: It is used to suppress the shock during the rebound after the spring absorbs shock and the impact from the road surface. It is widely used in automobiles to accelerate the attenuation of the vibration of the frame and the body, so as to improve the ride comfort of the automobile.

[0043] U-shaped bracket: Connects the shock absorber to the wheel and the frame.

[0044] Piston rod: The rod that plays a guiding role on the shock absorber.

[0045] Inflation needle: A tooling for inflation, inserted along the piston rod into the oil seal to form a gap between the oil seal and the piston rod, so that high-pressure nitrogen can be filled into the shock absorber.

[0046] Inflation hole: The gap through which high-pressure nitrogen can be filled into the shock absorber.

[0047] Oil seal: Seals the oil and gas inside the shock absorber.

[0048] Guide: Fixes the working cylinder and guides the movement of the piston rod.

[0049] Inner buffer block: Acts as a buffer block when the product is pulled to the maximum stroke.

[0050] Limit block: Limits the stroke.

[0051] Piston assembly: Where the damping force is generated.

[0052] Working cylinder: Provides guidance for the piston movement and stores oil.

[0053] Bottom valve: Fixes the working cylinder and generates damping.

[0054] Oil storage cylinder: Serves as support, protection, and oil storage.

[0055] Bottom cover: Serves as sealing and support.

[0056] It can be understood that for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.

Claims

1. An inflatable structure shock absorber, characterized in that: It includes a piston rod (1), an oil storage cylinder (7) and a working cylinder (8). The oil storage cylinder (7) is sleeved outside the working cylinder (8). A bottom cover (9) is installed at the rear end of the oil storage cylinder (7), and a bottom valve (10) is installed at the rear end of the working cylinder (8). After a piston assembly (6) is installed at the tail of the piston rod (1), it is inserted into the front end of the working cylinder (8) and slides relative to the working cylinder (8). A guide (3) is provided at the front end of the oil storage cylinder (7), and the guide (3) is in sealing cooperation with the mouth of the working cylinder (8). An oil seal (2) is provided at the front end of the guide (3), and the oil seal (2) and the guide (3) are pressed tightly after the mouth of the oil storage cylinder (7) is flanged; the mouth of the oil storage cylinder (7) on the side close to the guide (3) expands to form an inflation hole (12) for inflating the oil storage cylinder (7) before the oil seal (2) is press-fitted; an inner buffer block (4) and a limit block (5) are also installed on the piston rod (1).

2. The inflatable structure shock absorber according to claim 1, characterized in that: The position of the inflation hole (12) is above the final press-fitting position of the oil seal (2).

3. The inflatable structure shock absorber according to claim 1, characterized in that: The angle α formed by the outer wall of the inflation hole (12) relative to the outer wall of the oil storage cylinder (7) is 8°.

4. The inflatable structure shock absorber according to claim 1, characterized in that: The angle β formed by the two side edges at the mouth of the inflation hole (12) is 112°.

5. The inflatable structure shock absorber according to claim 1, wherein: The depth H of the inflation hole (12) is 3 mm.

6. The inflatable structure shock absorber according to claim 1, wherein: The width D of the inflation hole (12) is 1.5 mm.

7. The inflatable structure shock absorber according to claim 1, wherein: The length L1 at the opening of the inflation hole (12) is 7.6 mm, and the length L2 at the narrowed part of the inflation hole (12) is 2.3 mm.

8. The inflatable structure shock absorber according to claim 1, wherein: A U-shaped bracket (11) is fixed on the bottom cover (9).

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