Guider oil seal structure for automobile shock absorber and preparation method of guider oil seal structure

Abstract

The invention relates to the technical field of automobile shock absorbers, in particular to a guider oil seal structure for an automobile shock absorber and a preparation method of the guider oil seal structure. Three layers of stepped holes are formed in the guider base, a check valve body is installed in the first layer of stepped hole, a metal lining is arranged in the third 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, and an oil scraping ring is arranged in the last layer of stepped hole. An oil seal inner hole is formed in the center of the oil seal assembly, a first lip and a third lip are arranged at the two ends of the oil seal inner hole respectively, a second lip is arranged in the middle section of the oil seal inner hole, a spring is arranged on the outer side between the second lip and the third lip in a sleeved mode, a non-return lip is arranged on the outer side of the spring, and the non-return lip is pressed on the non-return valve body to form a one-way valve. Compared with the prior art, the leakage probability of oil liquid and air is reduced, the howling abnormal sound caused by air circulation is reduced, the friction abnormal sound is reduced, the sealing performance of the oil seal is improved, the material utilization rate is increased, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive shock absorbers, and more specifically, to a guide oil seal structure for automotive shock absorbers and a preparation method thereof. Background Art

[0002] Currently, the development and utilization of environmental resources by human society are increasing day by day, followed by increasing environmental pressure. To address this challenge, local governments have put forward more stringent requirements for the environmental protection standards of enterprises. Against this background, the automotive industry is accelerating its transformation towards the new energy vehicle field. At the same time, the quality requirements of vehicle manufacturers for automotive parts are also continuously improving. Among them, automotive shock absorbers, as a key factor affecting vehicle handling stability and driving smoothness, play a crucial role in the competition of the automotive industry.

[0003] It is worth noting that the working lubrication condition of the piston rod directly affects the performance and working efficiency of the shock absorber. How to ensure that the piston rod can move up and down smoothly while preventing oil leakage in the cylinder body and effectively guaranteeing the normal operation of the shock absorber is a problem that needs to be solved. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a guide oil seal structure for automotive shock absorbers, including a guide assembly, a check valve body, and an oil seal assembly. The guide assembly includes a guide base. The interior of the guide base is provided with three layers of stepped holes. The first layer of stepped holes is provided with evenly distributed oil drain and exhaust holes. A check valve body is installed in the first layer of stepped holes. The third layer of stepped holes is provided with a metal bushing. The check valve body is provided with three layers of stepped holes. The upper end of the top layer of stepped holes is evenly provided with oil drain and exhaust grooves. An oil seal assembly is installed in the top layer of stepped holes. A scraping ring is provided in the bottom layer of stepped holes. 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. Lip one and lip three are respectively provided at both ends of the oil seal inner hole. Lip two is provided in the middle section. A spring is sleeved on the outside between lip two and lip three. A check lip is provided on the outside 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. Its assembly method is: press the metal bushing into the bottom of the guide base until the lower edge of the metal bushing is flush with the lower edge of the guide base. Place the scraping ring in the bottom layer of the three-layer stepped holes of the guide base. Press the check valve body into the guide base to connect with the top of the scraping ring. Press the oil seal assembly into the guide base to connect and engage with the top of the check valve body.

[0005] Reinforcing ribs are evenly provided on the outside of the first layer of stepped holes of the guide base.

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

[0007] An automotive shock absorber includes a shock absorber outer cylinder, a shock absorber inner cylinder, and a piston rod. One end of the shock absorber is provided with the guide oil seal structure described in the claims. The top end of the shock absorber inner cylinder abuts against the outside of the guide base. The shock absorber outer cylinder is provided outside the shock absorber inner cylinder. The piston rod passes through the guide oil seal structure and extends into the shock absorber inner cylinder, and the piston rod reciprocates in the guide oil seal assembly. Its assembly method is as follows: The piston rod passes through the three-layer stepped hole of the guide oil seal structure. The lower edge of the guide assembly is installed on the shock absorber inner cylinder. The maximum outer diameter of the oil seal assembly is in interference fit with the inner diameter of the shock absorber outer cylinder. The guide assembly is joined to the shock absorber outer cylinder and the top of the shock absorber inner cylinder. The part of the shock absorber outer cylinder above the upper edge of the guide assembly is rolled and flattened by rolling, so that the folded edge of the shock absorber outer cylinder presses on the upper edge of the oil seal assembly.

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

[0009] The oil scraping ring and the metal bushing are in clearance fit with the piston rod.

[0010] A preparation method for a guide oil seal structure for an automotive shock absorber, the specific steps are as follows: S1. The guide base is manufactured by a powder metallurgy process; S2. The main material of the oil seal assembly is rubber and is made by injection molding with a mold; S3. The check valve body is made of a thermoplastic polymer and is made by injection molding with a mold; S4. The oil scraping ring is made of a fluoropolymer composite material composed of a dielectric layer and a metal layer and is made by injection molding with a mold, and it is inspected that the tensile strength is greater than or equal to 10 MPa and the elongation rate is greater than or equal to 30; S5. The metal bushing is made of steel and is formed by rolling metal sheets, and a Teflon coating is applied on the outside. The specific steps of the step S1 are as follows: S11. Mix the powder to ensure uniform mixing of the raw materials, S12. Check the powder mixing, S13. Pressing and pressing inspection, S14. Sintering, S15. Sandblasting, S16. Oil immersion to improve corrosion resistance and wear resistance, S17. Sintering inspection, detecting the product size, hardness, and strength, S18. Mold shaping, S19. Finishing to remove impurities, S20. Cleaning and removing impurities, S21. Finished product inspection, and the minimum pressing force of the product is inspected to be 600 N, the tensile strength is greater than or equal to 270 MPa, and the elongation rate is greater than or equal to 36.

[0011] Compared with the prior art, the present invention reduces the leakage probability of oil and air, reduces the whistling noise caused by air circulation, reduces the frictional noise, and increases the sealing performance of the oil seal. It improves the material utilization rate, realizes the precise forming of complex shapes, has higher dimensional accuracy, reduces subsequent processing procedures, and lowers the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the guide oil seal; Figure 2 They are the sectional view, front view, top view and bottom view of the guide assembly; Figure 3 They are the sectional view and three-dimensional view of the check valve body; Figure 4 It is a schematic structural diagram when the check valve body is arranged inside the guide assembly; Figure 5 They are the sectional view and three-dimensional view of the oil seal assembly; Figure 6 It is a schematic structural diagram of the vehicle shock absorber; Figure 7 It is a schematic diagram of the gas flow direction of the guide oil seal structure; Figure 8 It is a schematic diagram of the one-way gas valve formed by the check lip and the check valve body; See Figures 1 to 6 , 1. Guide assembly, 2. Check valve body, 3. Oil seal assembly, 4. Guide base, 5. Oil drain and exhaust hole, 6. Reinforcing rib, 7. Metal bushing, 8. Oil drain and exhaust groove, 9. Oil scraping ring, 10. Oil seal inner hole, 11. Lip one, 12. Lip two, 13. Lip three, 14. Check lip, 15. Spring, 16. Metal skeleton, 17. Shock absorber outer cylinder, 18. Shock absorber inner cylinder, 19. Piston rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present invention will be further described below with reference to the drawings.

[0014] As Figures 1 to 6, 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. The guide assembly 1 includes a guide base 4. Inside the guide base 4, there are three layers of stepped holes. The first-layer stepped hole is provided with evenly distributed oil drainage and exhaust holes 5. The check valve body 2 is installed inside the first-layer stepped hole. The third-layer stepped hole is provided with a metal bushing 7. Inside the check valve body 2, there are three layers of stepped holes. At the upper end of the top-layer stepped hole, there are evenly arranged oil drainage and exhaust grooves 8. The positions of the oil drainage and exhaust holes 5 and the oil drainage and exhaust grooves 8 correspond one by one. The oil seal assembly 3 is installed inside the top-layer stepped hole. Inside the bottom-layer stepped hole, there is an oil scraping ring 9. The oil seal assembly 3 includes an oil seal inner hole 10, a first lip 11, a second lip 12, a third lip 13, a check lip 14, a spring 15, and a metal skeleton 16. The center of the oil seal assembly 3 is the oil seal inner hole 10. At both ends of the oil seal inner hole 10, there are respectively a first lip 11 and a third lip 13. In the middle section, there is a second lip 12. Outside the second lip 12 and the third lip 13, there is a spring 15 sleeved. Outside the spring 15, there is a check lip 14. The check lip 14 presses on the check valve body 2 to form a one-way valve. Oil and gas can only flow from bottom to top. Due to the oil pressure in the reverse direction, the check lip 14 closes and cannot flow through. On one side of the oil seal assembly 3, there is a metal skeleton 16 embedded to ensure the overall strength of the oil seal assembly. Its assembly method is as follows: Press the metal bushing 7 into the bottom of the guide base 4 until the lower edge of the metal bushing 7 is flush with the lower edge of the guide base 4. Place the oil scraping ring 9 inside the bottom-layer stepped hole of the three-layer stepped hole of the guide base 4. Press the check valve body 2 into the guide base 4 to connect with the top of the oil scraping ring 9. Press the oil seal assembly 3 into the guide base 4 to connect and combine with the top of the check valve body 2.

[0015] On the outer side of the first-layer stepped hole of the guide base 4, there are evenly arranged reinforcing ribs 6.

[0016] The first-layer stepped hole of the guide base 4 and the check valve body 2 are in interference fit, and the third-layer stepped hole and the metal bushing 7 are in interference fit.

[0017] An automotive shock absorber, comprising a shock absorber outer cylinder 17, a shock absorber inner cylinder 18, and a piston rod 19. One end of the shock absorber is provided with the guide oil seal structure of claims 1-3. The top end of the shock absorber inner cylinder 18 abuts against the outside of the guide base 4. The shock absorber outer cylinder 19 is provided outside the shock absorber inner cylinder 18. The piston rod 19 passes through the guide oil seal structure and extends into the shock absorber inner cylinder 18. The piston rod 19 reciprocates in the guide oil seal assembly. Its assembly method is as follows: The piston rod 19 passes through the three-layer stepped hole of the guide oil seal structure. The lower edge of the guide assembly 1 is installed on the shock absorber inner cylinder 18. The maximum outer diameter of the oil seal assembly 3 has an interference fit with the inner diameter of the shock absorber outer cylinder 17. The guide assembly 1 is joined to the top of the shock absorber outer cylinder 17 and the shock absorber inner cylinder 18. The part of the shock absorber outer cylinder 17 above the upper edge of the guide assembly 1 is rolled and flattened by rolling, so that the folded edge of the shock absorber outer cylinder 17 presses on the upper edge of the oil seal assembly 3.

[0018] The diameter of each layer of the three-layer stepped hole of the guide base 4 is larger than the diameter of the piston rod 19, that is, the inner hole of the guide base 4 does not contact the piston rod 19. The diameter of each layer of the three-layer stepped hole of the check valve body 2 is larger than the diameter of the piston rod 19, that is, the inner hole of the check valve body 2 does not contact the piston rod 19.

[0019] The scraping ring 9 and the metal bushing 7 have a clearance fit with the piston rod 19. The function of the scraping ring 9 is to reduce the air bubbles in the oil, so that the oil and air pass through the check lip 14 more smoothly.

[0020] A preparation method for a guide oil seal structure for an automotive shock absorber, the specific steps are as follows: S1. The guide base is manufactured by powder metallurgy process; S2. The main material of the oil seal assembly is rubber and is made by die injection molding; S3. The check valve body is made of PA6 or PA66 and is made by die injection molding; S4. The scraping ring is made of PTEF, which has excellent high temperature resistance and good elasticity, and the adhesion is also very strong. It is made by die injection molding and the tensile strength is tested to be greater than or equal to 10 MPa, and the elongation rate is greater than or equal to 30; S5. The metal bushing is made of 45 steel and is formed by rolling metal sheets, and a Teflon coating is applied on the outside; The specific steps of the step S1 are as follows: S11. Mix the powder to ensure uniform mixing of raw materials, S12. Check the mixed powder, S13. Pressing and pressing inspection, S14. Sintering, S15. Sandblasting, S16. Oil immersion to improve corrosion resistance and wear resistance, S17. Sintering inspection, detecting product size, hardness, strength, S18. Die shaping, S19. Finishing to remove impurities, S20. Cleaning and removing impurities, S21. Finished product inspection, checking that the minimum pressing force of the product is 600 N, the tensile strength is greater than or equal to 270 MPa, and the elongation rate is greater than or equal to 36. The sealing performance of the entire guide oil seal structure is significantly improved.

[0021] Such as Figures 7 to 8, when the piston rod 19 reciprocates, the present invention plays a role in sealing oil and gas. When the piston rod 19 moves upward, the oil and air in the inner cylinder 18 of the shock absorber will be compressed and flow into a chamber formed by the check valve body 2 and the oil seal assembly 3 through the clearance between the oil scraping ring 9, the metal bushing 7 and the inner hole of the check valve body 2 and the piston rod 19. The check lip 14 presses on the check valve body 2 to form a check valve, and the oil and gas can only flow from bottom to top. Due to the oil pressure in the reverse direction, the check lip 14 closes and cannot flow. Therefore, when the piston rod 19 moves upward, the oil and air in the inner cylinder 18 of the shock absorber can flow into the inner and outer cylinders 17 of the shock absorber, avoiding excessive pressure and leakage through the triple lips of the oil seal assembly 3.

[0022] When the piston rod 19 moves downward, the oil and air in the inner and outer cylinders 17 of the shock absorber will be compressed. However, the check lip 14 closes, and the oil and air will only flow through the valve body at the bottom of the shock absorber, preventing the flow in the guide oil seal structure, thereby reducing the leakage probability of the oil and air at this place.

[0023] In addition to reducing the leakage probability of oil and air, the above structure with the design of unidirectional air flow also reduces the whistling and abnormal noise caused by air flow. The Teflon coating of the metal bushing 7 greatly reduces the friction of the piston rod 19 and also reduces the friction abnormal 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 described guide assembly (1) includes a guide base (4). Inside the guide base (4), there are three-layer stepped holes. The first-layer stepped hole is provided with evenly distributed oil-draining and air-exhausting holes (5). A check valve body (2) is installed in the first-layer stepped hole. The third-layer stepped hole is provided with a metal bushing (7). The check valve body (2) is provided with three-layer stepped holes. At the upper end of the top-layer stepped hole, there are evenly distributed oil-draining and air-exhausting grooves (8). An oil seal assembly (3) is installed in the top-layer stepped hole. A scraping oil ring (9) is arranged in the last-layer stepped hole. The oil seal assembly (3) includes an oil seal inner hole (10), lip one (11), lip two (12), lip three (13), check lip (14), spring (15), and metal skeleton (16). The center of the oil seal assembly (3) is the oil seal inner hole (10). At both ends of the oil seal inner hole (10), there are lip one (11) and lip three (13) respectively. In the middle section, there is lip two (12). A spring (15) is sleeved on the outer side between lip two (12) and lip three (13). A check lip (14) is arranged on the outer side of the spring (15). The check lip (14) presses on the check valve body (2) to form a one-way valve. A metal skeleton (16) is embedded on one side of the oil seal assembly (3). Its assembly method is: press the metal bushing (7) into the bottom of the guide base (4) until the lower edge of the metal bushing (7) is flush with the lower edge of the guide base (4). Place the scraping oil ring (9) in the last layer of the three-layer stepped hole of the guide base (4). Press the check valve body (2) into the guide base (4) to connect with the top of the scraping oil ring (9). Press the oil seal assembly (3) into the guide base (4) to connect and engage with the top of the check valve body (2).

2. The guide oil seal structure for an automotive shock absorber according to claim 1, characterized in that: On the outer side of the first-layer stepped hole of the described guide base (4), there are evenly distributed reinforcing ribs (6).

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

4. The preparation method of a guide oil seal structure for an automotive shock absorber according to claim 1, characterized in that: The specific steps are as follows: S1. The guide base (4) is manufactured by powder metallurgy process; S2. The main material of the oil seal assembly (3) is rubber and is made by die injection molding; S3. The check valve body (2) is made of a thermoplastic polymer and is made by die injection molding; S4. The oil scraping ring (9) is made of a fluoropolymer composite material composed of a dielectric layer and a metal layer, and is made by die injection molding, and the tensile strength is inspected to be greater than or equal to 10 MPa, and the elongation is greater than or equal to 30; S5. The metal bushing (7) is made of steel and is formed by rolling metal sheets, and a Teflon coating is applied on the outside; The specific steps of the step S1 are as follows: S11. Mix the powder to ensure uniform mixing of raw materials, S12. Check the powder mixing, S13. Pressing and pressing inspection, S14. Sintering, S15. Sandblasting, S16. Oil immersion to improve corrosion resistance and wear resistance, S17. Sintering inspection, detecting the product size, hardness, and strength, S18. Die shaping, S19. Deburring by finishing, S20. Cleaning and removing impurities, S21. Finished product inspection, and the minimum pressing force of the product is inspected to be 600 N, the tensile strength is greater than or equal to 270 MPa, and the elongation is greater than or equal to 36.

5. An automotive shock absorber, comprising the guide oil seal structure according to any one of claims 1-3, a shock absorber outer cylinder (17), a shock absorber inner cylinder (18), and a piston rod (19), characterized in that: For the guide oil seal structure at one end of the shock absorber, the top of the inner cylinder (18) of the shock absorber abuts against the outside of the guide base (4). An outer cylinder (19) of the shock absorber is provided on the outside of the inner cylinder (18) of the shock absorber. 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. Its assembly method is: The piston rod (19) passes through the three-layer stepped hole of the guide oil seal structure. The lower edge of the guide assembly (1) is installed on the inner cylinder (18) of the shock absorber. The maximum outer diameter of the oil seal assembly (3) has an interference fit with the inner diameter of the outer cylinder (17) of the shock absorber. The guide assembly (1) is joined to the top of the outer cylinder (17) and the inner cylinder (18) of the shock absorber. The part of the outer cylinder (17) of the shock absorber higher than the upper edge of the guide assembly (1) is rolled flat by rolling, so that the folded edge of the outer cylinder (17) of the shock absorber presses on the upper edge of the oil seal assembly (3).

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

7. An automotive shock absorber according to claim 5, characterized in that: There is a clearance fit between the oil scraping ring (9), the metal bushing (7) and the piston rod (19).

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