Oil seal and shock absorber

Abstract

The invention discloses an oil seal and a shock absorber, and relates to the technical field of oil seal design, the oil seal is used for being arranged on a guider of the shock absorber and between a piston rod and an outer cylinder, and the outer wall of the oil seal is provided with a vent groove communicated with the two end faces of the oil seal. After the oil seal provided by the invention is assembled and before spinning sealing, when the piston rod moves downwards, air in the shock absorber can be exhausted from the vent groove, so that the oil seal is prevented from bulging out when the piston rod moves downwards, subsequent spinning sealing of an outer cylinder is facilitated, and the yield is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, in particular to an oil seal and a shock absorber. Background Art

[0002] Oil seals are common seals in shock absorber structures. During the assembly process of the shock absorber, when the oil seal in the shock absorber enters the outer tube, the outer diameter is squeezed, causing the outer circle to fit tightly with the inner wall of the outer tube, which seals the inside of the shock absorber. When the piston rod moves downward, the pressure inside the shock absorber increases, which can easily cause the oil seal to bulge out of the outer tube, making it impossible to spin and seal. Summary of the invention

[0003] The purpose of the present invention is to provide an oil seal and a shock absorber to solve the problems existing in the above-mentioned prior art and improve the yield rate.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The invention provides an oil seal which is used to be arranged on a guide of a shock absorber and between a piston rod and an outer cylinder. The outer wall of the oil seal is provided with ventilation grooves which communicate with both end surfaces of the oil seal.

[0006] Preferably, a plurality of ventilation grooves are provided.

[0007] Preferably, the ventilation grooves are uniformly arranged in sequence around the circumference of the oil seal.

[0008] Preferably, it comprises a frame and a rubber body, wherein the rubber body is coated on the outside of the frame, and the ventilation groove is opened on the rubber body.

[0009] Preferably, an annular sealing body is constructed at the bottom of the rubber body, and the sealing body is used to be sleeved outside the annular boss on the top of the guide, and the axially extending length of the sealing body is greater than the axially extending length of the annular boss.

[0010] Preferably, at least a portion of the outer wall of the sealing body is used for clearance fit with the outer cylinder.

[0011] Preferably, the ventilation groove is extended along the circumference of the outer wall of the rubber body.

[0012] Preferably, the depth of the ventilation groove is 0.01-1 mm; the bottom surface of each ventilation groove is projected along the axial direction of the oil seal as an arc, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

[0013] The present invention also provides a shock absorber, comprising a piston rod, an inner tube, a guide, an outer tube and the oil seal as described above.

[0014] Preferably, the bottom of the oil seal is constructed with an annular sealing body and an annular sealing tongue, the sealing body is arranged around the sealing tongue, an annular groove is formed between the sealing body and the sealing tongue, the top of the guide is constructed with an annular boss, the annular boss extends into the annular groove, before spin sealing, there is a gap between the bottom surface of the annular groove and the top surface of the annular boss, and there is a gap between at least part of the outer wall of the sealing body and the outer cylinder, after spin sealing, the bottom surface of the annular groove and the top surface of the annular boss are tightly fitted, and the outer wall of the sealing body is tightly fitted with the inner wall of the outer cylinder.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] After the oil seal provided by the present invention is assembled, before the spinning seal, when the piston rod moves downward, the air in the shock absorber will be discharged from the ventilation groove, thereby avoiding the bulging of the oil seal when the piston rod moves downward, thereby facilitating the subsequent spinning seal of the outer cylinder to improve the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a shock absorber after the oil seal is assembled and spun and sealed in the related technology;

[0019] Figure 2 A schematic diagram of the structure of an oil seal provided in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Bottom view of

[0021] Figure 4 For the general Figure 2 Schematic diagram of the oil seal in FIG. 1 after assembly and before spinning and sealing;

[0022] In the figure: 1-oil seal; 2-skeleton; 3-sealing body; 4-sealing tongue; 5-rubber body; 6-venting groove; 7-annular groove; 8-outer cylinder; 9-guide.

[0023] 101 - piston rod in related technology; 102 - oil seal in related technology; 103 - guide in related technology; 104 - inner cylinder in related technology; 105 - outer cylinder in related technology. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] First, some technical terms involved in the embodiments of the present application are introduced.

[0027] Spin sealing is the process of bending the upper edge of the outer tube inward and pressing the oil seal tightly after the oil seal is installed on the guide and between the piston rod and the outer tube.

[0028] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0029] The present invention provides an oil seal 1, which is used to be arranged on a guide 9 of a shock absorber and between a piston rod and an outer cylinder 8. The outer wall of the oil seal 1 is provided with a venting groove 6 connecting the two end surfaces of the oil seal 1.

[0030] After the oil seal 1 provided by the present invention is assembled, before the spinning seal, when the piston rod moves downward, the air in the shock absorber will be discharged from the ventilation groove 6, thereby avoiding the bulging of the oil seal 1 when the piston rod moves downward, and facilitating the subsequent spinning seal of the outer cylinder 8. Since the upper edge of the outer cylinder 8 is folded inward to press the oil seal 1 after the spinning seal, this process often causes the oil seal 1 to deform and thus improves the sealing effect. It can be understood that the solution provided by the present invention substantially weakens the sealing performance of the oil seal 1 before the spinning seal. However, since the oil seal 1 is made of elastic material, and usually the spinning seal causes the oil seal 1 to deform along the axial or height direction, thereby enhancing its sealing performance for the shock absorber.

[0031] It should be noted that the above-mentioned end faces refer to the end faces of the oil seal 1 at both ends along the length direction of the piston rod when the oil seal 1 is in the assembled state. When the oil seal 1 is a rotating body, the above-mentioned end faces refer to the faces of the oil seal 1 at both ends in the axial direction.

[0032] In some embodiments, a plurality of ventilation slots 6 are provided.

[0033] This embodiment is provided with a plurality of ventilation grooves 6 to improve the exhaust effect. Of course, in some examples, only one ventilation groove 6 may be provided.

[0034] The present application does not impose any restrictions on the shape of the vent groove 6. For example, the cross-section may be arc-shaped, square-shaped, strip-shaped, or various irregular shapes, as long as it can exhaust the gas inside the shock absorber before assembly.

[0035] When a plurality of ventilation grooves 6 are provided, the plurality of ventilation grooves 6 are preferably uniformly arranged in sequence around the circumference of the oil seal 1 . However, in some embodiments, the plurality of ventilation grooves 6 may also be unevenly distributed, which is not limited in the present invention.

[0036] In some embodiments, the frame 2 and the rubber body 5 are included. The rubber body 5 is wrapped around the frame 2 , and the venting groove 6 is opened on the rubber body 5 .

[0037] In some embodiments, an annular sealing body 3 is constructed at the bottom of the rubber body 5. The sealing body 3 is used to be sleeved outside the annular boss on the top of the guide 9. The axial extension length of the sealing body 3 is greater than the axial extension length of the annular boss.

[0038] This embodiment further weakens the sealing performance of the oil seal 1 on the shock absorber before the oil seal 1 is spun to seal, so as to facilitate the discharge of the gas inside the shock absorber. After the spun sealing, the sealing body 3 is deformed and shortened to the same length as the annular boss to enhance the sealing effect.

[0039] In some embodiments, at least a portion of the outer wall of the sealing body 3 is used to have a clearance fit with the outer cylinder 8 .

[0040] This embodiment further weakens the sealing performance of the oil seal 1 on the shock absorber before the oil seal 1 is spun on to facilitate the discharge of the gas inside the shock absorber. After the spun on sealing, the sealing body 3 is deformed and shortened, and the cross-sectional area is increased to fit tightly with the outer tube 8 to enhance the sealing effect.

[0041] In some embodiments, the vent groove 6 is extended along the circumference of the outer wall of the rubber body 5 .

[0042] Specifically, Figure 3 As shown, the depth of the ventilation groove 6 is 0.01-1mm; the bottom surface of each ventilation groove 6 is projected along the axial direction of the oil seal as an arc, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

[0043] The depth of the vent groove 6 in this embodiment is relatively shallow, which may be 0.01-1 mm, so that after the spinning sealing, the vent groove 6 can be filled and the sealing effect can be enhanced by the deformation of the oil seal in the axial and radial directions.

[0044] The present invention further provides a shock absorber, comprising a piston rod, an inner cylinder, a guide 9, an outer cylinder 8 and the oil seal 1 in the above embodiment.

[0045] This embodiment has all the advantages of the above embodiments, which will not be described in detail here.

[0046] In some embodiments, the bottom of the oil seal 1 is constructed with an annular sealing body 3 and an annular sealing tongue 4, the sealing body 3 is arranged around the sealing tongue 4, an annular groove 7 is formed between the sealing body 3 and the sealing tongue 4, the top of the guide 9 is constructed with an annular boss, the annular boss extends into the annular groove 7, before spinning and sealing, there is a gap between the bottom surface of the annular groove 7 and the top surface of the annular boss, and there is a gap between at least part of the outer wall of the sealing body 3 and the outer tube 8, after spinning and sealing, the bottom surface of the annular groove 7 and the top surface of the annular boss are tightly fitted, and the outer wall of the sealing body 3 is tightly fitted with the inner wall of the outer tube 8.

[0047] This embodiment further weakens the sealing performance of the oil seal 1 on the shock absorber before the oil seal 1 is spun on the seal, so as to facilitate the discharge of the internal gas of the shock absorber. After the spun on seal, the sealing body 3 is deformed and shortened in length, and the cross-sectional area is increased to fit closely with the outer tube 8 and be the same length as the annular boss, thereby enhancing the sealing effect.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An oil seal, used to be arranged on the guide of a shock absorber and between the piston rod and the outer cylinder, characterized in that: The outer wall of the oil seal is provided with a ventilation groove communicating with both end surfaces of the oil seal.

2. The oil seal according to claim 1, characterized in that: The ventilation grooves are provided in plurality.

3. The oil seal according to claim 2, characterized in that: The ventilation grooves are uniformly arranged in sequence around the circumference of the oil seal.

4. The oil seal according to claim 1, characterized in that: It comprises a frame and a rubber body, wherein the rubber body is covered on the frame, and the venting groove is arranged on the rubber body.

5. The oil seal according to claim 4, characterized in that: An annular sealing body is constructed at the bottom of the rubber body. The sealing body is used to be sleeved outside the annular boss at the top of the guide. The axially extending length of the sealing body is greater than the axially extending length of the annular boss.

6. The oil seal according to claim 5, characterized in that: At least a portion of the outer wall of the sealing body is used for clearance fit with the outer cylinder.

7. The oil seal according to claim 4, characterized in that: The ventilation groove is extended along the circumferential direction of the outer wall of the rubber body.

8. The oil seal according to claim 7, characterized in that: The depth of the ventilation groove is 0.01-1mm; the bottom surface of each ventilation groove is projected as an arc along the axial direction of the oil seal, and the arc is located on a circular trajectory; the angle between the two ends of the arc and the two connecting lines of the center of the circular trajectory is not less than 20°.

9. A shock absorber, characterized in that: The invention comprises a piston rod, an inner tube, a guide, an outer tube and the oil seal according to any one of claims 1 to 8.

10. The shock absorber according to claim 9, characterized in that: The bottom of the oil seal is constructed with an annular sealing body and an annular sealing tongue, the sealing body is arranged around the sealing tongue, an annular groove is formed between the sealing body and the sealing tongue, the top of the guide is constructed with an annular boss, the annular boss extends into the annular groove, before spinning and sealing, there is a gap between the bottom surface of the annular groove and the top surface of the annular boss, and there is a gap between at least part of the outer wall of the sealing body and the outer cylinder, after spinning and sealing, the bottom surface of the annular groove and the top surface of the annular boss are tightly fitted, and the outer wall of the sealing body is tightly fitted with the inner wall of the outer cylinder.

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