High-pressure sealing structural part for shock absorber

Abstract

The utility model provides a high-pressure sealing structural member for a shock absorber. The high-pressure sealing structural member comprises a shock absorber cylinder barrel, a piston rod, a guider and an oil seal assembly. A guide hole is formed in the middle of the guider and allows the piston rod to penetrate through, an annular groove is formed in the inner wall of the guide hole, an O-shaped ring and a first glyd ring are arranged in the annular groove, the O-shaped ring is arranged on the outer side of the first glyd ring, and the first glyd ring is attached to the piston rod in a sealed mode. A second glyd ring is fixedly arranged on the inner side of the oil seal assembly and matched with the piston rod in a sealing mode. The double-layer Glyd ring sealing structure is used, the sealing effect is good, no leakage exists under the pressure of 20 Mpa or above, and the requirement for use of high-pressure shock absorbers is met; and the service life of the shock absorber is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to shock absorber sealing technology especially relates to a high pressure sealing structural member for shock absorber. BACKGROUND

[0002] Hydraulic shock absorber is widely used in automobile damping system, when the frame and axle do reciprocating relative motion, piston (piston rod connects the frame or vehicle body) reciprocates in the cylinder (cylinder connects the axle) of shock absorber, and when the piston reciprocates in the cylinder, the oil in the shell repeatedly flows from one cavity to another cavity through some narrow aperture. Due to the throttling effect of small hole, at this time, the friction between hole wall and oil and the internal friction of liquid molecules form the damping force to vibration, so that the vibration energy of vehicle body and frame is converted into heat energy, is absorbed by oil and shock absorber shell, and then is dissipated to the atmosphere.

[0003] The existing shock absorber is sealed and fixed through an oil seal assembly, and the overall sealing strength is poor, so that the oil seal assembly is loose under the impact of high pressure, loses sealing property and causes oil leakage. SUMMARY

[0004] In view of the above problems, the utility model provides a high pressure sealing structural member for shock absorber.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A high pressure sealing structural member for shock absorber, including shock absorber cylinder, piston rod, guider, oil seal assembly;

[0007] The middle part of guider is equipped with guide hole for the piston rod to pass through, and the center of oil seal assembly is correspondingly provided with mounting hole for the piston rod to pass through and install, the open end of oil seal assembly is fixed on the outside of guider through sealing ring sealing sleeve, the piston rod penetrates the guide hole and the mounting hole, the guider is arranged in the shock absorber cylinder, and the oil seal assembly is fixed at the end of the shock absorber cylinder;

[0008] The inner wall of guide hole is equipped with annular groove, and the annular groove is equipped with O ring and first gley ring, the O ring is on the outside of first gley ring, and the first gley ring is sealed and matched with the piston rod;

[0009] The inner side of oil seal assembly is fixedly provided with second gley ring, and the second gley ring is sealed and matched with the piston rod.

[0010] Further, the oil seal assembly includes a cover body, a first sealing lip, a second sealing lip, a first clamping spring, a second clamping spring, and a metal framework.

[0011] The metal skeleton is arranged in the cover to support the cover, the first sealing lip is fixed in the cover, the first embracing spring is annular and is arranged outside the first sealing lip to make the first sealing lip sealingly cooperate with the piston rod; the second sealing lip is fixed in the mounting hole, and the second embracing spring is arranged outside the second sealing lip to make the second sealing lip sealingly cooperate with the piston rod.

[0012] Further, the metal skeleton comprises a first support skeleton and a second support skeleton, the first support skeleton is a support cover, the second support skeleton is a short cylinder, the rear end of the second sealing lip is provided with a first connecting piece, the first connecting piece is located in the cover, the support cover is arranged in the cover and presses the first connecting piece against the cover plate of the cover, the rear end of the first sealing lip is provided with a second connecting piece, the short cylinder presses the second connecting piece against the first support skeleton, and a circular groove is arranged in the end face of the end of the short cylinder away from the support cover.

[0013] Further, the first sealing lip is fixed to the second gasket ring near the end of the support cover.

[0014] Further, the outer side of the guide is provided with a limiting block, the outer side wall of the guide on the right side of the limiting block is provided with a sealing groove, the sealing groove is annular, and the sealing ring is arranged in the sealing groove.

[0015] Further, the first gasket ring and the second gasket ring respectively comprise a rubber O-shaped ring and a polytetrafluoroethylene ring, the rubber O-shaped ring is located outside the polytetrafluoroethylene ring to apply pressure to the polytetrafluoroethylene ring.

[0016] Further, the sealing groove is arranged near one side of the oil seal assembly, the inner side wall of the guide hole away from the oil seal assembly is further provided with a strip-shaped guide groove, the strip-shaped guide groove is arranged along the length direction of the guide, and a corresponding guide block is arranged on the piston rod.

[0017] Further, a filling sealing ring is further arranged in the cover, the filling sealing ring is arranged outside the second support skeleton and fills and seals the inner side wall of the cover.

[0018] Compared with the prior art, the high-pressure sealing structure for a shock absorber has the advantages that: 1. The sealing structure of the double-layer gasket is used, the sealing effect is good, no leakage occurs under a pressure of 20 Mpa or above, the high-pressure type shock absorber is satisfied, and the service life of the shock absorber is prolonged. 2. The first sealing lip and the second sealing lip are detachably fixed in the cover body, when the components are damaged due to abrasion, the damaged components can be replaced by being disassembled, the whole is not needed to be replaced, and the use cost is reduced. The first connecting plate and the second connecting plate are fixed by abutting, the sealing property between the components in the oil seal assembly is high, and liquid leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the high-pressure sealing structure for a shock absorber of the utility model.

[0020] Figure 2 It is an enlarged view of partial a of the high-pressure sealing structure for a shock absorber of the utility model.

[0021] Figure 3 It is a structure schematic view of the gasket of the high-pressure sealing structure for a shock absorber of the utility model. DETAILED DESCRIPTION

[0022] In order to further understand the purpose, structure, features and functions of the utility model, the following detailed description is made in combination with the embodiments.

[0023] Please refer to Figure 1 The high-pressure sealing structure for a shock absorber of the utility model comprises a shock absorber cylinder 100, a piston rod 200, a guide 300 and an oil seal assembly 400.

[0024] The guide 300 is provided with a guide hole 310 in the middle portion for the piston rod 200 to pass through, the oil seal assembly 400 is provided with a mounting hole 410 in the center for the piston rod to pass through and be mounted, the opening end of the oil seal assembly 400 is fixed on the outer side of the guide 300 through a sealing ring 500, the guide 300 and the oil seal assembly 400 are fixed firmly, have good sealing property, and prevent liquid leakage, the piston rod 200 penetrates through the guide hole 310 and the mounting hole 410, the guide 300 is arranged in the shock absorber cylinder 100, and the oil seal assembly 400 is fixed at the end portion of the shock absorber cylinder 100; the guide 300 has a guiding effect, ensures that the piston rod 200 reciprocates along the fixed direction, ensures that the shock absorber normally works, and the oil seal assembly 400 is fixed at the end portion of the cylinder, and oil leakage is prevented.

[0025] The inner wall of the guide hole 310 is provided with an annular groove 320, the annular groove 320 is provided with an O-ring 321 and a first Gley ring 322, the O-ring 321 is outside the first Gley ring 322, and the first Gley ring 322 is sealed and fitted with the piston rod 200; the O-ring 321 is arranged at the groove bottom of the annular groove 320, a buffering force is provided, the first Gley ring 322 is prevented from being deformed under pressure, the sealing property is prevented from being deteriorated in a long-term use process, the service life is affected, the Gley ring is used for sealing, has low friction, the sealing effect is good, and the sealing of the piston rod 200 in motion is facilitated.

[0026] The inner side of the oil seal assembly 400 is fixedly provided with a second Gley ring 600, and the second Gley ring 600 is sealed and fitted with the piston rod 200. The sealing structure of the double-layer Gley ring is used, the sealing effect is good, there is no leakage under a pressure of 20Mpa or above, the high-pressure type shock absorber is met, and the service life of the shock absorber is prolonged.

[0027] Combining Figure 2 The oil seal assembly 400 comprises a cover body 420, a first sealing lip 430, a second sealing lip 440, a first clamping spring 450, a second clamping spring 460 and a metal framework 470.

[0028] The metal framework 470 is arranged in the cover body 420 and supports the cover body, the strength of the oil seal is increased or decreased through the metal framework 470, oil leakage caused by deformation and damage of the oil seal is avoided. The first sealing lip 430 is fixed in the cover body 420, the first clamping spring 450 is annular and is arranged outside the first sealing lip 430 in a clamping mode, so as to enable the first sealing lip 430 to be sealed and fitted with the piston rod 200; the second sealing lip 440 is fixed in the mounting hole 410, and the second clamping spring 460 is arranged outside the second sealing lip 440 in a clamping mode, so as to enable the second sealing lip 440 to be sealed and fitted with the piston rod 200. The two sealing lips are used for sealing in the application, the sealing property is stronger, the first clamping spring 450 and the second clamping spring 460 are used for guaranteeing the interference fit between the first sealing lip 430 and the second sealing lip 440 and the piston rod 200, the first sealing lip 430 and the second sealing lip 440 are tightly fitted with the surface of the piston rod 200, the sealing property is good, and high-pressure impact can be resisted.

[0029] The metal framework 470 comprises a first support framework 471 and a second support framework 472, the first support framework 471 is a support cover, the second support framework 472 is a short cylinder, the rear end of the first sealing lip 430 is provided with a first connecting piece 441, the first connecting piece 441 is located in the cover body 420, the support cover 471 is arranged in the cover body 420 and tightly presses the first connecting piece 441 against the cover plate of the cover body; the rear end of the first sealing lip 430 is provided with a second connecting piece 431, the short cylinder 472 tightly presses the second connecting piece 431 against the first support framework 471, a circular groove 473 is concentrically arranged on the end face of the end of the short cylinder 472 away from the support cover 471, and the first clamping spring 450 is arranged in the circular groove 473. The first sealing lip 430 and the second sealing lip 440 are detachably fixed in the cover body 420, when the components are worn out and damaged, the damaged components can be replaced by disassembling, without the need for overall replacement, thereby reducing the use cost. By abutting and fixing the first connecting piece 441 and the second connecting piece 431, the sealing property between the components in the oil seal assembly is ensured to be high, and liquid leakage is avoided.

[0030] The first sealing lip 430 is fixed with the second garter spring 600 at the end close to the support cover. The second garter spring 600 can be fixed by being embedded in a groove arranged on the first sealing lip 430, or the first sealing lip 430 and the second garter spring 600 can be integrally connected. The first sealing lip 430 is made of elastic material and provides strong buffering force, so that the second garter spring 600 is prevented from being deformed for a long time, and the service life is prolonged. The first sealing lip 430 is tightly attached to the piston rod 200 by the extrusion force provided by the first clamping spring 450, so as to realize sealing and provide inward force for the second garter spring 600, thereby ensuring that the second garter spring 600 cooperates with the piston rod 200 to realize sealing. By arranging the second garter spring 600 between the first sealing lip 430 and the second sealing lip 440, the sealing effect of the oil seal assembly is improved by the multi-layer sealing structure.

[0031] The outer side of the guide 300 is provided with a limiting block 330, so that the guide 300 cooperates with the cylinder barrel 100, the guide 300 is limited at the end of the cylinder barrel 100, and movement is avoided. When guiding, the guide 300 does not move with the piston rod, so that the connection between the guide 300 and the oil seal assembly 400 is not loosened, and the sealing effect is affected. The outer side wall of the guide on the right side of the limiting block is provided with a sealing groove 340, the sealing groove 340 is annular, and the sealing ring 350 is arranged in the sealing groove, so that the sealing ring is fixed firmly and is prevented from falling off. The oil seal assembly 400 and the guide are sealingly connected and fixed firmly.

[0032] In combination Figure 3The first gasket 322 and the second gasket 600 respectively comprise a rubber O-shaped ring 1 and a polytetrafluoroethylene ring 2, the rubber O-shaped ring 1 is located outside the polytetrafluoroethylene ring 2 and exerts pressure on the polytetrafluoroethylene ring 2. The first gasket 322 and the second gasket 600 are guaranteed to have good sealing performance, the inner ring is made of polytetrafluoroethylene, the friction coefficient of polytetrafluoroethylene is extremely low, is suitable for dynamic sealing, can reduce wear, has good aging resistance and a long service life.

[0033] The sealing groove 340 is arranged on one side of the oil seal assembly 400, and the inner side wall of the guide hole 310 away from the oil seal assembly 400 is further provided with a strip-shaped guide groove 311, the strip-shaped guide groove 311 is arranged along the length direction of the guider 300, and the piston rod 200 is provided with a corresponding guide block. The piston rod 200 can only reciprocate along the length direction of the guider 300, rotation of the piston rod is avoided, wear caused by rotation is reduced, and the piston rod still has high sealing performance when used for a long time.

[0034] The filling sealing ring 480 is further arranged in the cover body 420, the filling sealing ring 480 is arranged outside the second support framework 472 and fills and seals the inner side wall of the cover body 420. The filling sealing ring 480 fills the gap between the outer side wall of the short cylinder 472 and the inner side wall of the cover body 420, guarantees sealing performance, improves support strength, prevents the cover body from being damaged and deformed due to a gap between the metal framework 470 and the cover body 420 in the oil seal assembly, and guarantees the service life of the oil seal assembly 400.

[0035] The utility model has been described by the above related embodiments, however, the above embodiments are only examples of implementing the utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the utility model. On the contrary, changes and decorations made without departing from the spirit and scope of the utility model are all within the scope of patent protection of the utility model.

Claims

1. A high-pressure sealing structure for a vibration damper, characterized in that: This includes the shock absorber cylinder, piston rod, guide, and oil seal assembly; The guide has a guide hole in the middle for the piston rod to pass through, and the oil seal assembly has a corresponding mounting hole at the center for the piston rod to pass through and be installed. The open end of the oil seal assembly is sealed and fixed to the outside of the guide by a sealing ring. The piston rod passes through the guide hole and the mounting hole. The guide is set inside the shock absorber cylinder, and the oil seal assembly is fixed to the end of the shock absorber cylinder. The inner wall of the guide hole is provided with an annular groove, and an O-ring and a first Glycol ring are provided in the annular groove. The O-ring is outside the first Glycol ring, and the first Glycol ring seals and fits the piston rod. A second Glyd ring is fixedly provided on the inner side of the oil seal assembly, and the second Glyd ring seals and cooperates with the piston rod.

2. The high-pressure sealing structure for vibration dampers as described in claim 1, characterized in that: The oil seal assembly includes a cover, a first sealing lip, a second sealing lip, a first clamping spring, a second clamping spring, and a metal frame; The metal frame is disposed within the cover body to support the cover body. The first sealing lip is fixed within the cover body. The first clamping spring is annular and is clamped outside the first sealing lip to make the first sealing lip seal with the piston rod. The second sealing lip is fixed within the mounting hole. The second clamping spring is clamped outside the second sealing lip to make the second sealing lip seal with the piston rod.

3. The high-pressure sealing structure for vibration dampers as described in claim 2, characterized in that: The metal frame includes a first support frame and a second support frame. The first support frame is a support cover, and the second support frame is a short cylinder. A first connecting piece is provided at the rear end of the second sealing lip. The first connecting piece is located inside the cover body. The support cover is disposed inside the cover body and presses the first connecting piece against the cover plate of the cover body. A second connecting piece is provided at the rear end of the first sealing lip. The short cylinder presses the second connecting piece against the first support frame. A circular groove is concentrically provided on the end face of the short cylinder away from the support cover. The first clamping spring is disposed in the circular groove.

4. The high-pressure sealing structure for a vibration damper as described in claim 3, characterized in that: The second glyph is fixed to one end of the first sealing lip near the support cover.

5. The high-pressure sealing structure for a vibration damper as described in claim 1, characterized in that: The guide is provided with a limiting block on its outer side, and a sealing groove is provided on the outer side wall of the guide to the right of the limiting block. The sealing groove is annular, and the sealing ring is installed in the sealing groove.

6. The high-pressure sealing structure for a vibration damper as described in claim 1, characterized in that: The first and second glyphs each include a rubber O-ring and a polytetrafluoroethylene (PTFE) ring, with the rubber O-ring located outside the PTFE ring to apply pressure to the PTFE ring.

7. The high-pressure sealing structure for a vibration damper as described in claim 5, characterized in that: The sealing groove is provided on the side close to the oil seal assembly, and the inner wall of the guide hole on the side away from the oil seal assembly is also provided with a strip-shaped guide groove. The strip-shaped guide groove is provided along the length direction of the guide, and a corresponding guide block is provided on the piston rod.

8. The high-pressure sealing structure for a vibration damper as described in claim 3, characterized in that: The cover body is also provided with a filling and sealing ring, which is located on the outside of the second support frame and fills and seals the inner wall of the cover body.

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