Damping oil cylinder

Abstract

The damping oil cylinder comprises a cylinder body, a piston rod and an outer shell, an opening is formed in the initial end of the outer shell, the tail end of the cylinder body is arranged in the outer shell in a relative sliding mode through the opening, the initial end of the cylinder body penetrates out of the outer shell through the opening, an end cover is arranged at the tail end of the cylinder body, and a cylinder cavity is formed in the cylinder body. The piston rod is arranged in the shell, the tail end of the piston rod is connected with the tail end of the shell, a penetrating hole allowing the initial end of the piston rod to penetrate into the cylinder cavity is formed in the end cover, and a piston head is arranged at the initial end of the piston rod. The inner circumferential wall of the through hole is provided with a sealing piece used for sealing a gap between the inner circumferential wall of the through hole and the outer circumferential wall of the piston rod and a fastening piece used for being matched with the sealing piece to improve the sealing strength of the sealing piece. The oil cylinder solves the problem that the sealing strength between the piston rod and the end of the cylinder body of a traditional oil cylinder is too low.

Description

Technical Field

[0001] The utility model relates to the technical field of shock-absorbing oil cylinders, in particular to a shock-absorbing oil cylinder. Background Art

[0002] The shock-absorbing cylinder is a hydraulic cylinder technology mainly used in vehicles such as motorcycles and automobiles to improve driving comfort and reduce vibration. It consists of a cylinder body, an outer shell and a piston rod. The piston rod is slidably arranged in the cylinder body and the change of the hydraulic pressure inside the cylinder body is realized through the piston head. The traditional cylinder body has a through-hole at its end for the piston rod to pass through and slide, but there is only a sealing gasket between the traditional through-hole and the piston rod. The sealing effect of the sealing gasket is low and the sealing strength gradually decreases with the sliding frequency of the piston rod. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a shock-absorbing oil cylinder to solve the problem of low sealing strength between the piston rod and the end of the cylinder body of the traditional oil cylinder.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a shock-absorbing oil cylinder, including a cylinder body, a piston rod and an outer shell, the starting end of the outer shell is provided with an opening, the end of the cylinder body is relatively slidably arranged in the outer shell through the opening, the starting end of the cylinder body passes through the opening to the outside of the outer shell, the end of the cylinder body is an end cover, the cylinder body is provided with a cylinder cavity, the piston rod is arranged in the outer shell and its end is connected to the end of the outer shell, the end cover is provided with a through hole for the starting end of the piston rod to pass through the cylinder cavity, the starting end of the piston rod is provided with a piston head, and the inner circumferential wall of the through hole is provided with a seal for sealing the gap between the inner circumferential wall of the through hole and the outer circumferential wall of the piston rod and a fastener for cooperating with the seal to improve the sealing strength of the seal.

[0005] The benefits of adopting the above technical solution are: in the above technology, the seal is arranged between the inner peripheral wall of the perforation and the outer peripheral wall of the piston rod to play a sealing role, and the sealing strength of the seal is improved by cooperating with the fastener and the seal, while avoiding liquid overflow between the perforation and the piston rod.

[0006] The utility model is further provided with: a sealing groove is annularly opened on the inner circumferential wall of the through hole, and the sealing member includes two groups of sealing groups, which are arranged opposite to each other, and the sealing group is composed of a first sealing ring and a second sealing ring, the outer circumferential wall of the first sealing ring and the outer circumferential wall of the second sealing ring are both connected to the inner circumferential wall of the sealing groove, the inner circumferential wall of the first sealing ring and the inner circumferential wall of the second sealing ring are both in contact with the outer circumferential wall of the piston rod, a plurality of first sealing openings are opened on the inner side wall of the first sealing ring, a plurality of the first sealing openings are combined to form a first sealing surface and the radial cross-section of the first sealing surface is arranged in a stepped shape, a plurality of second sealing openings are opened on the outer side wall of the second sealing ring, a plurality of the second sealing openings are combined to form a second sealing surface and the radial cross-section of the second sealing surface is arranged in a stepped shape, the first sealing surface and the second sealing surface are arranged opposite to each other and the first sealing surface and the second sealing surface are arranged in a tight fit, and the outer side wall of the first sealing ring is arranged in a tight fit with the inner wall of the sealing groove.

[0007] The benefits of adopting the above technical solution are: in the above technology, the first sealing ring and the second sealing ring are expanded and fitted to achieve sealing between the through-hole and the piston rod, and at the same time, the first sealing surface and the second sealing surface are expanded and fitted to improve the sealing strength between the through-hole and the piston rod, that is, when the piston rod is used at a high frequency, a certain offset force will be applied to the first sealing ring or the second sealing ring, but due to the restrictions of the first sealing surface and the second sealing surface, it is difficult for the first sealing ring and the second sealing ring to shift, shake or loosen along the axis of the piston rod, thereby improving the sealing strength of the first sealing ring and the second sealing ring between the piston rod and the through-hole.

[0008] The present invention is further provided with: a fastening groove is opened in an annular direction on the inner side wall of the second sealing ring, a fastening ring is arranged in the fastening groove, the fastening ring is recessed with a plurality of recessed parts toward the bottom wall of the fastening groove, the outer walls of the plurality of recessed parts are all arranged in partial abutment with the bottom wall of the fastening groove, the fastening ring is raised with a plurality of raised parts toward the top wall of the fastening groove, the outer walls of the plurality of raised parts are all arranged in partial abutment with the top wall of the fastening groove, the positions of the plurality of raised parts are staggered with the positions of the plurality of recessed parts, the fastening ring is a fastener and is made of elastic metal material.

[0009] The benefits of adopting the above technical solution are: in the above technology, the fastening ring applies a force to the fastening groove through the raised portion and the recessed portion, that is, applies an upward and downward force to the fastening groove along the radial direction of the piston rod, thereby applying a force to the second sealing ring, so that the second sealing ring transmits part of the force to the inner wall of the sealing groove and the piston rod, thereby achieving sealing between the through hole and the piston rod, and thereby improving the sealing strength between the two. At the same time, the fastening ring is made of elastic metal material to facilitate its installation and application of force to the fastening groove, and it will also bear part of the force when it is subjected to the force applied by the movement of the piston rod. Due to its elastic properties, when the recessed portion or the raised portion is subjected to a force, the recessed portion or the raised portion is deformed and a reaction force is generated and applied to the fastening groove, thereby avoiding the sealing failure of the second sealing ring under high-frequency activity of the piston rod, thereby improving the sealing strength and sealing life.

[0010] The utility model is further provided with: a linear bearing is provided between the two groups of sealing groups, the outer ring of the linear bearing is connected to the inner peripheral wall of the sealing groove, and the inner side walls of the second sealing rings of the two groups of sealing groups are respectively abutted and matched with the two side walls of the outer ring of the linear bearing.

[0011] The benefits of adopting the above technical solution are: in the above technology, the smoothness of the piston rod sliding in the perforation is improved by setting a linear bearing, thereby avoiding affecting the sliding efficiency of the piston rod, and the two sets of sealing groups are restricted by linear bearings to improve the stability of the two sets of sealing groups in the sealing groove.

[0012] The utility model is further provided with: the first sealing ring and the second sealing ring are both made of sealing rubber material.

[0013] The benefit of adopting the above technical solution is that: in the above technology, the first sealing ring and the second sealing ring are both made of sealing rubber material, so that the first sealing ring and the second sealing ring can be installed, and at the same time they have a certain elasticity, so that the first sealing ring and the second sealing ring can be normally expanded and fitted to improve the sealing strength between the perforation and the piston rod, thereby adapting to working conditions with high sealing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a simplified cross-sectional view of the utility model;

[0015] Figure 2 This is a front view of the fastening ring in the present invention. DETAILED DESCRIPTION

[0016] The utility model provides a shock-absorbing oil cylinder, comprising a cylinder body 1, a piston rod 2 and an outer shell 3, wherein the outer shell 3 has an opening at the beginning, the end of the cylinder body 1 is relatively slidably arranged in the outer shell 3 through the opening, the beginning of the cylinder body 1 passes through the opening to the outside of the outer shell 3, the end of the cylinder body 1 is an end cover 11, the cylinder body 1 has a cylinder cavity 12, the piston rod 2 is arranged in the outer shell 3 and its end is connected to the end of the outer shell 3, the end cover 11 is provided with a through hole 111 for the beginning of the piston rod 2 to pass through the cylinder cavity 12, the beginning of the piston rod 2 is provided with a piston head 21, and the inner peripheral wall of the through hole 111 is provided with a sealing member for sealing the gap between the inner peripheral wall of the through hole 111 and the outer peripheral wall of the piston rod 2 and a fastener for cooperating with the seal to improve the sealing strength of the seal, a sealing groove 112 is circumferentially opened on the inner circumferential wall of the through hole 111, and the seal includes two groups of sealing groups, which are arranged opposite to each other, and the sealing group is composed of a first sealing ring 4 and a second sealing ring 5. The outer circumferential wall of the first sealing ring 4 and the outer circumferential wall of the second sealing ring 5 are both connected to the inner circumferential wall of the sealing groove 112, and the inner circumferential wall of the first sealing ring 4 and the inner circumferential wall of the second sealing ring 5 are both in contact with the outer circumferential wall of the piston rod 2. The inner side wall of the first sealing ring 4 is provided with a plurality of first sealing openings, and the combination of the plurality of first sealing openings forms a first sealing surface 41, and the radial cross-section of the first sealing surface 41 is stepped The outer wall of the second sealing ring 5 is provided with a plurality of second sealing openings, and the plurality of second sealing openings are combined to form a second sealing surface 51, and the radial cross-section of the second sealing surface 51 is arranged in a stepped manner. The first sealing surface 41 is arranged opposite to the second sealing surface 51, and the first sealing surface 41 is tightly fitted with the second sealing surface 51. The outer wall of the first sealing ring 4 is tightly fitted with the inner wall of the sealing groove 112. A fastening groove 52 is annularly provided on the inner wall of the second sealing ring 5, and a fastening ring 53 is provided in the fastening groove 52. The fastening ring 53 is recessed with a plurality of recessed portions 54 toward the bottom wall of the fastening groove 52, and the outer walls of the plurality of recessed portions 54 are aligned with the bottom wall of the fastening groove 52. The fastening ring 53 is provided with a plurality of raised portions 55 raised toward the top wall of the fastening groove 52, and the outer walls of the plurality of raised portions 55 are partially abutted and matched with the top wall of the fastening groove 52. The positions of the plurality of raised portions 55 are staggered one by one with the positions of the plurality of recessed portions 54. The fastening ring 53 is a fastener and the fastening ring 53 is made of elastic metal material. A linear bearing 6 is provided between the two groups of sealing groups. The outer ring of the linear bearing 6 is connected to the inner circumferential wall of the sealing groove 112. The inner side walls of the second sealing rings 5 of the two groups of sealing groups are respectively abutted and matched with the two side walls of the outer ring of the linear bearing 6. The first sealing ring 4 and the second sealing ring 5 are both made of sealing rubber material.

[0017] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A shock-absorbing oil cylinder comprising a cylinder body, a piston rod, and a housing, wherein the housing has an opening at its beginning, the cylinder body is relatively slidably disposed in the housing through the opening, and the cylinder body extends out of the housing through the opening, characterized in that: The end of the cylinder body is an end cover, and the cylinder body is provided with a cylinder cavity. The piston rod is arranged in the outer shell and its end is connected to the end of the outer shell. The end cover is provided with a through hole for the starting end of the piston rod to pass through the cylinder cavity. The starting end of the piston rod is provided with a piston head. The inner circumferential wall of the through hole is provided with a seal for sealing the gap between the inner circumferential wall of the through hole and the outer circumferential wall of the piston rod and a fastener for cooperating with the seal to improve the sealing strength of the seal.

2. The shock-absorbing cylinder according to claim 1, characterized in that: A sealing groove is provided on the inner circumferential wall of the through hole in an annular direction, and the sealing member includes two sealing groups, which are arranged opposite to each other, and the sealing group is composed of a first sealing ring and a second sealing ring, the outer circumferential wall of the first sealing ring and the outer circumferential wall of the second sealing ring are both connected to the inner circumferential wall of the sealing groove, the inner circumferential wall of the first sealing ring and the inner circumferential wall of the second sealing ring are both in contact with the outer circumferential wall of the piston rod, a plurality of first sealing openings are provided on the inner side wall of the first sealing ring, a plurality of the first sealing openings are combined to form a first sealing surface, and the radial cross-section of the first sealing surface is arranged in a stepped shape, a plurality of second sealing openings are provided on the outer side wall of the second sealing ring, a plurality of the second sealing openings are combined to form a second sealing surface, and the radial cross-section of the second sealing surface is arranged in a stepped shape, the first sealing surface and the second sealing surface are arranged opposite to each other and the first sealing surface and the second sealing surface are expanded fit, and the outer side wall of the first sealing ring is expanded fit with the inner wall of the sealing groove.

3. The shock-absorbing cylinder according to claim 2, characterized in that: A fastening groove is provided on the inner side wall of the second sealing ring in an annular direction, a fastening ring is provided in the fastening groove, the fastening ring is recessed with a plurality of recessed portions toward the bottom wall of the fastening groove, the outer walls of the plurality of recessed portions are partially abutted and matched with the bottom wall of the fastening groove, the fastening ring is raised with a plurality of raised portions toward the top wall of the fastening groove, the outer walls of the plurality of raised portions are partially abutted and matched with the top wall of the fastening groove, the positions of the plurality of raised portions are staggered one by one with the positions of the plurality of recessed portions, the fastening ring is a fastener and is made of elastic metal material.

4. The shock-absorbing oil cylinder according to claim 2, characterized in that: A linear bearing is arranged between the two sealing groups. The outer ring of the linear bearing is connected to the inner peripheral wall of the sealing groove. The inner side walls of the second sealing rings of the two sealing groups are respectively abutted and matched with the two side walls of the outer ring of the linear bearing.

5. The shock-absorbing cylinder according to claim 2, characterized in that: The first sealing ring and the second sealing ring are both made of sealing rubber material.

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