Guider oil seal structure for automobile shock absorber

Abstract

The utility model relates to the technical field of automobile shock absorbers, in particular to a guider oil seal structure for an automobile shock absorber. The guider assembly comprises a guider base, three layers of stepped holes are formed in the guider base, a check valve body is installed in the first layer of stepped hole, three layers of stepped holes are formed in the check valve body, an oil seal assembly is installed in the top layer of stepped hole, an oil scraping ring is arranged in the last layer of stepped hole, and an oil seal inner hole is formed in the center of the oil seal assembly. A first lip and a third lip are respectively arranged at two ends of an inner hole of the oil seal, a second lip is arranged in the middle section of the inner hole of the oil seal, a spring is sleeved on the outer side between the second lip and the third lip, a non-return lip is arranged on the outer side of the spring, the non-return lip is pressed on the non-return valve body to form a one-way valve, and a metal framework is embedded on one side of the oil seal assembly. Compared with the prior art, the leakage probability of oil liquid and air is reduced, the squeal abnormal sound caused by air circulation is reduced, the friction abnormal sound is reduced, and the sealing performance of the oil seal is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, specifically a guide oil seal structure for automotive shock absorbers. Background Technology

[0002] Vehicle manufacturers are continuously raising their quality requirements for automotive components. Among them, shock absorbers, as a key factor affecting vehicle handling stability and ride comfort, play a crucial role in the competition within the automotive industry.

[0003] It is worth noting that the lubrication condition of the piston rod directly affects the performance and efficiency of the shock absorber. Ensuring smooth up-and-down movement of the piston rod while preventing oil leakage from the cylinder, and effectively guaranteeing the normal operation of the shock absorber, is a problem that needs to be solved. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides a guide oil seal structure for an automotive shock absorber, comprising a guide assembly, a check valve body, and an oil seal assembly. The guide assembly includes a guide base with three layers of stepped holes inside. The first layer of stepped holes has evenly distributed oil drain and vent holes, and a check valve body is installed within it. The third layer of stepped holes has a metal bushing. The check valve body has three layers of stepped holes, with evenly distributed oil drain holes at the top of the top stepped hole. The oil venting channel has an oil seal assembly installed in the top stepped hole and an oil scraper ring installed in the bottom stepped hole. The oil seal assembly includes an oil seal inner hole, lip one, lip two, lip three, check lip, spring, and metal skeleton. The center of the oil seal assembly is the oil seal inner hole. Lips one and three are respectively provided at both ends of the oil seal inner hole, and lip two is provided in the middle section. A spring is sleeved on the outer side between lip two and lip three. A check lip is provided on the outer side of the spring. The check lip presses on the check valve body to form a one-way valve. A metal skeleton is embedded on one side of the oil seal assembly.

[0005] The guide base has reinforcing ribs evenly distributed on the outer side of the first-layer stepped hole.

[0006] The first-layer stepped hole of the guide base is interference-fitted with the check valve body, and the third-layer stepped hole is interference-fitted with the metal bushing.

[0007] An automotive shock absorber includes an outer cylinder, an inner cylinder, and a piston rod. One end of the shock absorber is provided with a guide oil seal structure. The top of the inner cylinder abuts against the outer side of the guide base. The outer cylinder is provided on the outer side of the inner cylinder. The piston rod passes through the guide oil seal structure and extends into the inner cylinder. The piston rod reciprocates within the guide oil seal assembly.

[0008] The diameter of each of the three stepped holes in the guide base is larger than the diameter of the piston rod, and the diameter of each of the three stepped holes in the check valve body is larger than the diameter of the piston rod.

[0009] The oil scraper ring and the metal bushing are fitted with a clearance fit to the piston rod.

[0010] Compared with the prior art, this invention reduces the probability of oil and air leakage, reduces whistling noise caused by air circulation, reduces friction noise, and increases the sealing performance of the oil seal. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the guide oil seal structure;

[0012] Figure 2 The cross-sectional view, front view, top view, and bottom view of the guide assembly are shown.

[0013] Figure 3 Cross-sectional and perspective views of the stop valve body;

[0014] Figure 4 A schematic diagram of the structure when a check valve body is installed inside the guide assembly;

[0015] Figure 5 The images show cross-sectional and perspective views of the oil seal assembly.

[0016] Figure 6 A schematic diagram of a car shock absorber structure;

[0017] Figure 7 A schematic diagram of the gas flow direction in the guide oil seal structure;

[0018] Figure 8 A schematic diagram of a one-way gas valve formed by a check lip and a check valve body;

[0019] See Figures 1 to 6 1. Guide assembly, 2. Check valve body, 3. Oil seal assembly, 4. Guide base, 5. Oil drain and vent hole, 6. Reinforcing rib, 7. Metal bushing, 8. Oil drain and vent groove, 9. Oil scraper ring, 10. Oil seal inner hole, 11. Lip one, 12. Lip two, 13. Lip three, 14. Check lip, 15. Spring, 16. Metal frame, 17. Shock absorber outer cylinder, 18. Shock absorber inner cylinder, 19. Piston rod. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figures 1 to 6A guide oil seal structure for an automotive shock absorber includes a guide assembly 1, a check valve body 2, and an oil seal assembly 3. The guide assembly 1 includes a guide base 4, which has three layers of stepped holes inside. The first layer of stepped holes has evenly distributed oil drain and vent holes 5, and the check valve body 2 is installed inside the first layer of stepped holes. The third layer of stepped holes has a metal bushing 7. The check valve body 2 has three layers of stepped holes inside. The top layer of stepped holes has evenly distributed oil drain and vent grooves 8 at its upper end. The top layer of stepped holes has an oil seal assembly 3 installed inside its top layer of stepped holes. The bottom layer of stepped holes has an oil scraper ring 9. The oil seal assembly 3 includes an oil seal inner hole 10 and a lip. 11. Lip 12. Lip 13. Check lip 14. Spring 15. Metal skeleton 16. The center of the oil seal assembly 3 is the oil seal inner hole 10. Lips 11 and 33 are respectively provided at both ends of the oil seal inner hole 10. Lip 2 12 is provided in the middle section. Spring 15 is sleeved on the outer side between lips 2 12 and 3 13. Check lip 14 is provided on the outer side of spring 15. Check lip 14 presses on check valve body 2 to form a one-way valve. Oil and gas can only flow from bottom to top. In the opposite direction, due to oil pressure, check lip 14 closes and cannot flow. Metal skeleton 16 is embedded on one side of oil seal assembly 3 to ensure the overall strength of oil seal assembly.

[0022] The first-layer stepped hole of the guide base 4 is uniformly provided with reinforcing ribs 6.

[0023] The first stepped hole of the guide base 4 is interference-fitted with the check valve body 2, and the third stepped hole is interference-fitted with the metal bushing 7.

[0024] An automotive shock absorber includes an outer cylinder 17, an inner cylinder 18, and a piston rod 19. One end of the shock absorber is provided with a guide oil seal structure. The top end of the inner cylinder 18 abuts against the outer side of the guide base 4. The outer cylinder 17 is provided on the outer side of the inner cylinder 18. The piston rod 19 passes through the guide oil seal structure and extends into the inner cylinder 18. The piston rod 19 reciprocates within the guide oil seal assembly.

[0025] The diameter of each of the three stepped holes in the guide base 4 is larger than the diameter of the piston rod 19, meaning that the inner hole of the guide base 4 and the piston rod 19 do not contact each other. Similarly, the diameter of each of the three stepped holes in the check valve body 2 is larger than the diameter of the piston rod 19, meaning that the inner hole of the check valve body 2 and the piston rod 19 do not contact each other.

[0026] The oil scraper ring 9, the metal bushing 7, and the piston rod 19 are fitted with a clearance. The function of the oil scraper ring 9 is to reduce air bubbles in the oil, allowing the oil and air to pass more smoothly through the check lip 14.

[0027] The guide base 4 is manufactured using powder metallurgy. The oil scraper ring 9 is a fluoropolymer composite material composed of a dielectric layer and a metal layer, exhibiting excellent high-temperature resistance, good elasticity, and very strong adhesion. The check valve body 3 is a high-performance thermoplastic polymer. The metal bushing 8 is a Teflon-coated metal ring with self-lubricating properties. The main body of the oil seal assembly 3 is made of rubber, and the metal skeleton is made of 45# steel.

[0028] like Figures 7 to 8 When the piston rod 19 reciprocates, this invention functions to seal the oil and gas. When the piston rod 19 moves upward, the oil and air inside the damper inner cylinder 18 are compressed and flow into a chamber formed by the check valve body 2 and the oil seal assembly 3 through the gap between the oil scraper ring 9, the metal bushing 7, the inner hole of the check valve body 2, and the piston rod 19. The check lip 14 presses against the check valve body 2 to form a one-way valve, allowing oil and gas to flow only from bottom to top. In the opposite direction, due to oil pressure, the check lip 14 closes, preventing flow. Therefore, when the piston rod 19 moves upward, the oil and air in the damper inner cylinder 18 can flow into the damper outer cylinder 17, preventing excessive pressure and leakage through the triple lip of the oil seal assembly 3.

[0029] When the piston rod 19 moves downward, the oil and air inside the outer cylinder 17 of the shock absorber are compressed. However, the check lip 14 is closed, and the oil and air will only flow from the valve body at the bottom of the shock absorber, eliminating the flow in the guide oil seal structure, thereby reducing the probability of oil and air leakage at that point.

[0030] In addition to reducing the probability of oil and air leakage, the above structure, with its unidirectional airflow design, also reduces whistling noises caused by airflow. The Teflon coating on the metal bushing 7 significantly reduces friction on the piston rod 19, thus reducing friction noise. The three-layer lip structure of the oil seal assembly 3 increases the sealing performance of the oil seal.

Claims

1. A guide oil seal structure for an automotive shock absorber, comprising a guide assembly (1), a check valve body (2), and an oil seal assembly (3), characterized in that: The guide assembly (1) includes a guide base (4), which has three layers of stepped holes inside. The first layer of stepped holes has evenly distributed oil drain and vent holes (5). A check valve body (2) is installed in the first layer of stepped holes. A metal bushing (7) is installed in the third layer of stepped holes. The check valve body (2) has three layers of stepped holes inside. An oil drain and vent groove (8) is evenly distributed at the upper end of the top stepped hole. An oil seal assembly (3) is installed in the top stepped hole. An oil scraper ring (9) is installed in the last stepped hole. The oil seal assembly (3) includes an oil seal inner hole (10) and a lip. The oil seal assembly (3) consists of an oil seal inner hole (10) at its center, a lip (11) and a lip (13) at its two ends, a lip (2) and a spring (15) on its outer side, and a lip (14) on its outer side. The lip (14) is pressed against the check valve body (2) to form a one-way valve. The oil seal assembly (3) is equipped with a metal skeleton (16) on one side.

2. The guide oil seal structure for an automotive shock absorber according to claim 1, characterized in that: The guide base (4) is provided with reinforcing ribs (6) uniformly on the outer side of the first layer of stepped hole.

3. The guide oil seal structure for an automotive shock absorber according to claim 1, characterized in that: The first layer of stepped hole of the guide base (4) and the check valve body (2) are interference fit, and the third layer of stepped hole and the metal bushing (7) are interference fit.

4. An automotive shock absorber, comprising the guide oil seal structure as described in any one of claims 1-3, an outer cylinder (17) of the shock absorber, an inner cylinder (18) of the shock absorber, and a piston rod (19), characterized in that: The shock absorber has a guide oil seal structure at one end. The top of the inner cylinder (18) of the shock absorber abuts against the outer side of the guide base (4). The outer cylinder (17) of the shock absorber is provided on the outer side of the inner cylinder (18). The piston rod (19) passes through the guide oil seal structure and extends into the inner cylinder (18) of the shock absorber. The piston rod (19) reciprocates in the guide oil seal assembly.

5. The automotive shock absorber according to claim 4, characterized in that: The diameter of each of the three-layer stepped holes of the guide base (4) is greater than the diameter of the piston rod (19), and the diameter of each of the three-layer stepped holes of the check valve body (2) is greater than the diameter of the piston rod (19).

6. The automotive shock absorber according to claim 4, characterized in that: The oil scraper ring (9), the metal bushing (7), and the piston rod (19) are fitted with a clearance.

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