CN211924798U

CN211924798U - Floating piston assembly and shock absorber

Info

Publication number: CN211924798U
Application number: CN202020302662.5U
Authority: CN
Inventors: 李雪冰; 危银涛; 胡阳关
Original assignee: Coma Intelligent Suspension Technology Qingdao Co ltd
Current assignee: Coma Intelligent Suspension Technology Qingdao Co ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-11-13
Anticipated expiration: 2030-03-12

Abstract

The utility model relates to a shock absorber technical field discloses a floating piston subassembly and shock absorber, and this floating piston subassembly includes: the floating piston is provided with an annular groove, the sealing ring is sleeved in the annular groove, and the sealing ring and the inner wall of the annular groove form a sealing space; the upper end of the floating piston is provided with a first skirt part, a first through hole is formed in the first skirt part, and the first through hole is communicated with the sealed space; the lower extreme of floating piston has the second skirt portion, has seted up the second via hole on the second skirt portion, and the second via hole communicates with confined space. This shock absorber includes: the floating piston assembly is arranged in the cylinder body. The utility model provides a floating piston assembly has balanced the pressure of the inside and outside both sides of sealing washer through set up the first via hole and the second via hole of intercommunication annular on floating piston, makes its deformation even, and sealed effect is better. The utility model provides a shock absorber adopts above-mentioned floating piston subassembly, and damping and shock-absorbing capacity are better.

Description

Floating piston assembly and shock absorber

Technical Field

The utility model relates to a shock absorber technical field especially relates to a floating piston subassembly and shock absorber.

Background

The shock absorber is a member for accelerating the attenuation of the vibration of the vehicle frame and the vehicle body to improve the ride comfort of the vehicle. The single cylinder inflatable shock absorber is a common shock absorber, a working piston and a floating piston are arranged in a cylinder body of the single cylinder inflatable shock absorber, the working piston is arranged on the upper portion, the floating piston is arranged on the lower portion, the cylinder body is divided into three parts, high-pressure liquid is filled in closed spaces on the upper side and the lower side of the working piston, a damping hole is formed in the working piston, and a closed air chamber is formed between the lower portion of the floating piston and the cylinder body. The floating piston separates the liquid and the gas on two sides of the floating piston through a sealing ring sleeved on the floating piston. When the piston reciprocates in the cylinder, the volume change caused by the piston rod entering and exiting the liquid chamber is compensated by the relative up-and-down movement of the floating piston.

The working principle of the single-cylinder inflatable shock absorber is as follows: in the wheel jumping process, a working piston of the shock absorber reciprocates in a cylinder body, so that shock absorption liquid in the working cylinder body passes through a damping hole in the working piston; the damping liquid has certain viscosity, and the damping liquid generates friction with the hole wall when passing through the damping hole, so that the function of damping vibration is realized through the conversion of kinetic energy.

The floating piston plays a sealing role through the sealing ring, as shown in fig. 1 and fig. 2, a ring groove for installing the sealing ring on the floating piston in the prior art is smaller than the diameter of the sealing ring, so as to ensure that the sealing ring cannot turn over in the process of up-and-down repeated movement. However, after the sealing ring is installed, a sealing space is formed between the sealing ring and the inner wall of the annular groove, in the working process, the pressure on the inner side and the outer side of the sealing ring is unequal, the part, attached to the inner wall of the cylinder body of the shock absorber, of the outer side of the sealing ring is acted by high-pressure gas and high-pressure liquid, the pressure is higher, the inward compression deformation is caused, the area S1 of the attached part of the sealing ring and the inner wall of the cylinder body is smaller than the area S2 of the attached part of the sealing ring and the inner wall of the annular groove.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a floating piston subassembly and shock absorber to solve the poor technical problem of floating piston subassembly sealed effect and shock absorber performance under the prior art.

In order to achieve the purpose, the utility model adopts the following technical proposal:

there is provided a floating piston assembly comprising: the floating piston is provided with an annular groove, the sealing ring is sleeved in the annular groove, and a sealing space is formed between the sealing ring and the inner wall of the annular groove;

the upper end of the floating piston is provided with a first skirt part, a first through hole is formed in the first skirt part, and the first through hole is communicated with the sealed space;

the lower end of the floating piston is provided with a second skirt portion, a second through hole is formed in the second skirt portion, and the second through hole is communicated with the sealed space.

Preferably, the sealing ring and the inner wall of the ring groove form a first sealing space and a second sealing space, the first via hole is communicated with the first sealing space, and the second via hole is communicated with the second sealing space.

Preferably, the first via hole and the second via hole are concentric.

Preferably, the first via hole and the second via hole are provided in plurality, and the first via hole and the second via hole are uniformly arranged in the circumferential direction of the floating piston.

Preferably, the diameter of the first via hole and the diameter of the second via hole are between 2 and 5 mm.

Preferably, the annular groove with the sealing washer all is provided with a plurality ofly, and is a plurality of the annular groove is followed the equidistant arrangement of floating piston's axial, every install one in the annular groove the sealing washer.

Preferably, the seal ring is made of a resin or rubber material.

The utility model also provides a shock absorber, it includes the cylinder body and as above-mentioned arbitrary scheme the floating piston subassembly, the floating piston unit mount in the cylinder body, high-pressure gas and high-pressure liquid are filled respectively in the space of floating piston's the upper and lower both sides.

The utility model has the advantages that:

the utility model provides a floating piston subassembly is through offering first via hole and second via hole on floating piston, wherein the high-pressure fluid of one side in first via hole intercommunication annular and the cylinder body, the high-pressure fluid of opposite side in second via hole intercommunication annular and the cylinder body has guaranteed like this that the sealing washer is packed into the annular in the back pressure that the inside and outside both sides received equals for the sealing washer warp evenly, has guaranteed the sealing washer effect. The utility model provides a shock absorber adopts above-mentioned floating piston subassembly, and damping and shock-absorbing capacity are better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a prior art lower floating piston assembly;

FIG. 2 is an enlarged view at A in FIG. 1;

fig. 3 is a schematic structural diagram of a floating piston provided in an embodiment of the present invention;

fig. 4 is a cross-sectional view of a floating piston assembly provided by an embodiment of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is a schematic structural diagram of a shock absorber according to an embodiment of the present invention.

In the figure: 1. a floating piston; 11. a ring groove; 12. a first skirt portion; 13. a second skirt portion; 14. a first via hole; 15. a second via hole; 16. a first sealed space; 17. a second sealed space; 2. a seal ring; 3. a cylinder body.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 3 to 6, the present embodiment provides a floating piston assembly and a shock absorber, the floating piston assembly is installed in a cylinder 3 of the shock absorber, the floating piston assembly divides an inner space of the cylinder 3 of the shock absorber into two closed parts, the two closed parts are respectively used for filling high-pressure gas and high-pressure liquid with equal pressure, when the pressure fluctuation occurs in the high-pressure gas or the high-pressure liquid at one end, the floating piston 1 moves axially in the cylinder 3 to buffer the pressure fluctuation, thereby playing a role of damping the pressure fluctuation.

As shown in fig. 4, the floating piston assembly provided in this embodiment includes a floating piston 1 and a sealing ring 2, wherein the sealing ring 2 is sleeved on the floating piston. Specifically, the floating piston 1 has a cylindrical structure, a piston rod (not shown) is installed inside the floating piston 1, an annular groove 11 is formed on the outer side of the floating piston, the annular groove 11 is used for sleeving the sealing ring 2, a first skirt portion 12 and a second skirt portion 13 are respectively formed at two ends of the floating piston 1, the inner space of the cylinder 3 at the upper end of the first skirt portion 12 is filled with high-pressure gas, and the inner space of the cylinder 3 at the lower end of the second skirt portion 13 is filled with high-pressure liquid.

The sealing ring 2 is sleeved in the annular groove 11, the outer diameter of the sealing ring 2 is larger than that of the annular groove 11, and meanwhile, the outer diameter of the sealing ring 2 is also larger than the inner diameter of the cylinder body 3 of the shock absorber, so that the sealing effect is achieved. The inner side of the seal ring 2 is closely attached to the inner wall of the ring groove 11, and a first sealed space 16 and a second sealed space 17 are formed at the upper and lower sides. In the present embodiment, in order to ensure the sealing effect, optionally, the sealing ring 2 is made of resin or rubber material, and preferably, the sealing ring 2 is made of nitrile rubber material.

The pressure in the first and second sealed

spaces

16 and 17 is one atmosphere pressure at the time of the packing 2 being fitted. In the working process of the floating piston assembly, the outer side of the sealing ring 2 is acted by high-pressure gas and high-pressure liquid (the pressure is about 3 MPa) on the upper side and the lower side, so that the sealing ring 2 is contracted and deformed inwards, the area S1 of the joint part of the outer side of the sealing ring and the cylinder body 3 is smaller than the area S2 of the joint part of the outer side of the sealing ring and the inner wall of the annular groove 11, namely, the sealing area is reduced, and the sealing effect is influenced.

To solve the above problem, in the present embodiment, as shown in fig. 5, a first through hole 14 communicating with the ring groove 11 is opened in the first skirt portion 12 of the floating piston 1, and a second through hole 15 communicating with the ring groove 11 is opened in the second skirt portion 13 of the floating piston 1. Further, the position of the first via hole 14 is aligned with the first sealed space 16, so that the first sealed space 16 is communicated with high-pressure gas, the pressure on the inner side and the pressure on the outer side of the upper surface of the sealing ring 2 are the same and are the pressure of the high-pressure gas, and the sealing ring 2 is deformed uniformly. In a similar way, the position of the second via hole 15 is aligned with the second sealed space 17, so as to communicate the second sealed space 17 with the high-pressure liquid, so that the pressures applied to the inner side and the outer side of the lower surface of the sealing ring 2 are equal, and the pressures are the pressures of the high-pressure liquid, so that the sealing ring 2 deforms uniformly. Through setting up first via hole 14 and second via hole 15 for the area S1 of the laminating part of sealing washer 2 and cylinder body 3 equals its area S2 with the laminating part of annular groove 11 inner wall, and sealed effect is better. The first through hole 14 and the second through hole 15 may be concentric or non-concentric, and in order to make the pressures applied to the upper and lower sides of the sealing ring 2 symmetrical, the first through hole 14 and the second through hole 15 are preferably concentric.

Further, the first via hole 14 and the second via hole 15 are provided in plurality, and the plurality of first via holes 14 and the plurality of second via holes 15 are uniformly arranged along the circumferential direction of the floating piston 1 to further ensure the sealing effect, and preferably, the number of the first via holes 14 and the number of the second via holes 15 are four. And, the diameters of the first and second via

holes

14 and 15 are both between 2-5 mm to maintain the structural strength of the floating piston 1 while ensuring the sealing effect, and preferably, the diameters of the first and second via

holes

14 and 15 are both 3 mm.

Further, in the present embodiment, the number of the ring grooves 11 and the number of the seal rings 2 may also be provided in plurality, the plurality of ring grooves 11 are arranged at equal intervals along the axial direction of the floating piston 1, and one seal ring 2 is sleeved in each ring groove 11 to form a multi-layer seal. The first through hole 14 and the second through hole 15 form a through hole, and the through holes are sequentially communicated with the first sealing space 16 and the second sealing space 17 in each ring groove 11, so that the pressures on the inner side and the outer side of each sealing ring 2 are balanced.

As shown in fig. 6, the utility model also provides a shock absorber, this shock absorber includes cylinder body 3 and the floating piston subassembly as described above, and 3 both sides of cylinder body are all sealed, and the floating piston subassembly is installed in the inside of

cylinder body

3, and 3 inner spaces of the cylinder body on floating piston subassembly upper portion fill high-pressure gas, and the lower part of floating piston subassembly fills high-pressure liquid, and the pressure of high-pressure gas and high-pressure liquid equals. When the pressure fluctuation occurs in the high-pressure liquid, the floating piston 1 moves axially along the cylinder 3, thereby buffering the pressure fluctuation. Due to the adoption of the floating piston assembly, the shock absorber has better sealing effect and better shock absorption performance.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A floating piston assembly, comprising: the piston comprises a floating piston (1) and a sealing ring (2), wherein the floating piston (1) is provided with a ring groove (11), the sealing ring (2) is sleeved in the ring groove (11), and the sealing ring (2) and the inner wall of the ring groove (11) form a sealing space;

the upper end of the floating piston (1) is provided with a first skirt part (12), a first through hole (14) is formed in the first skirt part (12), and the first through hole (14) is communicated with the sealed space;

the lower end of the floating piston (1) is provided with a second skirt portion (13), a second through hole (15) is formed in the second skirt portion (13), and the second through hole (15) is communicated with the sealed space.

2. The floating piston assembly according to claim 1, characterized in that the sealing ring (2) forms a first sealing space (16) and a second sealing space (17) with the inner wall of the ring groove (11), the first through hole (14) communicating with the first sealing space (16), the second through hole (15) communicating with the second sealing space (17).

3. The floating piston assembly of claim 1, wherein the first and second vias (14, 15) are concentric.

4. The floating piston assembly according to claim 1, characterized in that the first and second through holes (14, 15) are each provided in plurality, and the first and second through holes (14, 15) are each provided uniformly in the circumferential direction of the floating piston (1).

5. The floating piston assembly of claim 1, wherein the first and second through holes (14, 15) are between 2-5 mm in diameter.

6. The floating piston assembly according to claim 1, characterized in that said ring grooves (11) and said sealing rings (2) are each provided in plurality, said plurality of ring grooves (11) being arranged at equal intervals in the axial direction of said floating piston (1), one sealing ring (2) being installed in each of said ring grooves (11).

7. A floating piston assembly according to claim 1, characterised in that the sealing ring (2) is made of a resin or rubber material.

8. A vibration damper, characterized by comprising a cylinder (3) and a floating piston assembly according to any one of claims 1-7, said floating piston assembly being mounted in said cylinder (3), the spaces on the upper and lower sides of said floating piston (1) being filled with high-pressure gas and high-pressure liquid, respectively.