Sleeve type air spring system sealed by spinning type bag skin pressing hoop

Abstract

The utility model relates to the field of air spring structures, and discloses a sleeve type air spring system sealed by a spinning type bag pressing hoop, which comprises a piston base, a bag and an upper end cover, the upper end of the piston base is provided with a bag connecting end A, the lower end of the upper end cover is provided with a bag connecting end B, and the upper end and the lower end of the bag are respectively provided with an upper connecting end and a lower connecting end. The upper connecting end of the bag skin and the bag skin connecting end B of the upper end cover are in sealed lap joint and are sealed through an upper buckling ring assembly in a pressing hoop mode. The lower connecting end of the bag skin and the bag skin connecting end A of the piston base are in sealed lap joint and are sealed through a lower buckling ring assembly in a pressing hoop mode; the lower buckling and pressing ring assembly is formed by combining a plurality of hoop pressing ring units A, and a spinning type hoop pressing groove is formed between every two adjacent hoop pressing ring units A. According to the utility model, the sealing performance and the anti-falling performance of the connection of the upper end and the lower end of the bag skin are improved, so that the use durability, the maximum blasting pressure, the airtight attenuation performance and the like of the air spring assembled and manufactured by the air spring are greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of air spring structures, in particular to a sleeve-type air spring system with a spinning-type bladder-skin pressure hoop seal. Background Art

[0002] A sleeve-type air spring generally consists of an upper end cap, a bladder, and a piston base. The bladder is a key component of the sleeve-type air spring. Compressed air is filled inside the bladder, and the pressure of the compressed air can be used to adjust the spring's hardness as needed, thereby adjusting the vehicle's suspension system. The top of the bladder is connected to the upper end cap, and the bottom of the bladder is connected to the piston base. The sealing performance of the connection between the top and bottom of the bladder plays a vital role in the air spring's cushioning and shock absorption. In particular, when the sleeve-type air spring is in operation, the bladder expands and contracts, and the connection between the bladder and the piston base is prone to pulling apart, cracking, and air leakage, affecting the air spring's service life, maximum burst pressure, and 24-hour airtight attenuation performance. However, existing technologies have poor sealing performance in the bladder seal connection structure, which is prone to pulling apart and cracking. Therefore, it is necessary to optimize the sealing structure of existing sleeve-type air springs to ensure that the sealing structure between the top and bottom of the bladder is easy to implement and has good sealing performance, which will further improve the product performance and service life of the air spring. Utility Model Content

[0003] The purpose of the utility model is to provide a sleeve-type air spring system with a spin-type bladder skin pressure hoop seal, in which the lower end of the bladder skin is sealed and overlapped with the bladder skin connection end A of the piston base and is sealed by a lower buckle ring assembly pressure hoop, and the lower buckle ring assembly adopts a plurality of clamp pressure ring units A to combine and clamp and seal on the outer side of the lower end of the bladder skin, and two adjacent clamp pressure ring units A squeeze the rubber skin on the outer side of the lower end of the bladder skin to form a bladder skin pressure hoop protrusion A and are correspondingly squeezed and embedded into the spin-type pressure hoop groove, thereby all the bladder skin pressure hoop protrusions A form two discontinuous and mutually staggered bladder skin pressure hoop sealing lines A, thereby forming a tight multiple sealing structure, which improves the sealing performance and anti-slip performance between the lower end of the bladder skin and the piston base.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A sleeve-type air spring system with a spun-on bladder skin and a pressure hoop seal comprises a piston base, a bladder skin and an upper end cover, wherein the upper end of the piston base has a bladder skin connecting end A, the lower end of the upper end cover has a bladder skin connecting end B, the upper and lower ends of the bladder skin respectively have an upper connecting end and a lower connecting end, the upper connecting end of the bladder skin is sealingly overlapped with the bladder skin connecting end B of the upper end cover and is sealed by an upper pressure ring assembly pressure hoop; the lower connecting end of the bladder skin is sealingly overlapped with the bladder skin connecting end A of the piston base and is sealed by a lower pressure ring assembly pressure hoop; the lower pressure ring assembly is composed of a plurality of clamp and pressure ring units A, and a spun-on pressure hoop groove is provided between two adjacent clamp and pressure ring units A, and the spun-on pressure hoop groove is generally S-shaped.

[0006] In order to better realize the present invention, the middle part of the lower buckling ring assembly is provided with a hoop cavity A, and the lower connecting end of the bag skin is placed in the hoop cavity A of the lower buckling ring assembly; the hoop cavity A is enclosed by the inner walls of all the hoop pressure ring units A.

[0007] Preferably, the upper buckle ring assembly is composed of a plurality of clamp pressure ring units B, and a strip clamp groove is provided between two adjacent clamp pressure ring units B; the middle part of the upper buckle ring assembly has a clamp cavity B, and the upper connecting end of the bag skin is placed in the clamp cavity B of the upper buckle ring assembly; the clamp cavity B is enclosed by the inner walls of all the clamp pressure ring units B.

[0008] Preferably, the outer wall of the bag skin connecting end A is provided with anti-slip tooth lines A distributed along the height direction, and the outer wall of the lower connecting end is provided with anti-slip matching tooth lines A that mesh with the anti-slip tooth lines A distributed along the height direction.

[0009] Preferably, the outer wall of the bag skin connecting end B is provided with anti-slip tooth lines B distributed along the height direction, and the outer wall of the upper connecting end is provided with anti-slip matching tooth lines B that mesh with the anti-slip tooth lines B distributed along the height direction.

[0010] Preferably, when all the clamping ring units A of the lower buckle ring assembly are clamped and locked, the inner wall ends of all the clamping ring units A are tightly pressed against the lower connecting end of the bladder skin, and at the same time, the rubber skin part of the lower connecting end forms a bladder skin clamping protrusion A and is correspondingly squeezed and embedded into the spin-type clamping groove.

[0011] Preferably, a plurality of the bladder skin pressing hoop protrusions A are evenly distributed at intervals in a circumference on the lower connecting end of the bladder skin, and all the bladder skin pressing hoop protrusions A form two discontinuous and mutually offset bladder skin pressing hoop sealing lines A.

[0012] Preferably, when all the clamping ring units B of the upper buckle ring assembly are locked, the inner wall ends of all the clamping ring units B are tightly pressed against the upper connecting end of the bladder skin, and at the same time, the rubber skin part of the upper connecting end forms a bladder skin clamping protrusion B and is correspondingly squeezed and embedded into the strip clamping groove.

[0013] Preferably, a plurality of the bladder skin pressing hoop protrusions B are evenly distributed at intervals in a circumference on the upper connecting end of the bladder skin, and all the bladder skin pressing hoop protrusions B form two discontinuous bladder skin pressing hoop sealing lines B.

[0014] Preferably, the piston base is provided with an air nozzle connected to the internal cavity of the bladder skin; the lower end of the piston base is installed with a sealing ring A for sealing with the shock absorber oil storage cylinder, and the center of the upper end cover is installed with a sealing ring B for sealing with the shock absorber piston rod.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The lower end of the bladder skin of the utility model is sealed and overlapped with the bladder skin connection end A of the piston base and is sealed by the lower buckle pressure ring assembly. The lower buckle pressure ring assembly adopts a plurality of clamp pressure ring units A to clamp and seal on the outer side of the lower end of the bladder skin. Two adjacent clamp pressure ring units A squeeze the rubber skin on the outer side of the lower end of the bladder skin to form a bladder skin clamp protrusion A and correspondingly squeeze and embed into the spin-type clamp groove. As a result, all the bladder skin clamp protrusions A form two discontinuous and mutually offset bladder skin clamp sealing lines A, thereby forming a tight multiple sealing structure, improving the sealing performance and anti-slip performance between the lower end of the bladder skin and the piston base, and being able to meet the reciprocating telescopic motion of the bladder skin and the sealing and anti-slip requirements of the piston base.

[0017] (2) After the upper end of the bladder skin of the utility model is sealed and overlapped with the bladder skin connecting end B of the upper end cover, an upper buckle pressure ring assembly is used for pressure sealing. The upper buckle pressure ring assembly uses a plurality of clamp pressure ring units B to clamp and seal on the outer side of the lower end of the bladder skin. Two adjacent clamp pressure ring units B squeeze the rubber skin on the outer side of the lower end of the bladder skin to form a bladder skin pressure hoop protrusion B and correspondingly squeeze and embed into the strip pressure hoop groove. As a result, all the bladder skin pressure hoop protrusions B form two discontinuous bladder skin pressure hoop sealing lines B, thereby forming a tight multiple sealing structure, which improves the sealing performance and anti-slip performance between the upper end of the bladder skin and the upper end cover.

[0018] (3) The upper and lower ends of the bag skin of the utility model adopt an anti-slip tooth line combination structure that interlocks with each other, which further improves the sealing performance and anti-slip performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the external structure of the sleeve-type air spring system of the utility model after the compression hoop is sealed;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure after the right half is cut away;

[0021] Figure 3 for Figure 2 A partial enlarged view of the upper middle cover, upper connecting end, and upper buckle ring assembly after installation;

[0022] Figure 4 for Figure 2 A partial enlarged view of the middle piston base, lower connecting end, and lower retaining ring assembly after installation;

[0023] Figure 5 Schematic diagram of the combined structure of the lower buckling ring assembly in the embodiment;

[0024] Figure 6 Schematic diagram of the structure in which a bladder skin pressing hoop protrusion B and a bladder skin pressing hoop protrusion A are formed on the upper and lower sides respectively after the bladder skin plane is unfolded in the embodiment;

[0025] Figure 7 Schematic diagram of the upper connection end of the bladder skin forming the bladder skin pressure hoop sealing line B in the embodiment;

[0026] Figure 8 Schematic diagram of the bladder skin pressure hoop sealing line A formed at the upper connecting end of the bladder skin in the embodiment.

[0027] The names corresponding to the reference numerals in the accompanying drawings are:

[0028] 1-Piston base, 11-Bladder connection end A, 2-Bladder, 21-Lower connection end, 211-Bladder pressure hoop protrusion A, 212-Bladder pressure hoop sealing line A, 22-Upper connection end, 221-Bladder pressure hoop protrusion B, 222-Bladder pressure hoop sealing line B, 23-Cord mesh, 3-Upper end cover, 31-Bladder connection end B, 4-Upper buckle pressure ring assembly, 5-Lower buckle pressure ring assembly, 51-Holding hoop pressure ring unit A, 52-Spinning clamp groove, 6-Air nozzle, 7-Seal ring A, 8-Seal ring B. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the embodiments:

[0030] Example

[0031] like Figure 1 、 Figure 2 As shown, a sleeve-type air spring system with a spinning-type bladder skin and a pressure hoop seal includes a piston base 1, a bladder skin 2 and an upper end cover 3. The upper end of the piston base 1 has a bladder skin connection end A11, and the lower end of the upper end cover 3 has a bladder skin connection end B31 (the bladder skin connection end B31 is a connecting cylinder extending from the upper end cover 3 toward the bladder skin 2). The upper and lower ends of the bladder skin 2 respectively have an upper connection end 22 and a lower connection end 21. Figure 6 As shown, the main surface of the bladder skin 2 has a cord grid 23; the upper connecting end 22 of the bladder skin 2 is sealed and overlapped with the bladder skin connecting end B31 of the upper end cover 3 (the upper connecting end 22 of the bladder skin 2 is overlapped and sealed outside the bladder skin connecting end B31) and is sealed by the upper buckle ring assembly 4. Figure 3The outer wall of the bag skin connection end B31 is provided with anti-slip tooth lines B along the height direction, and the outer wall of the upper connection end 22 is provided with anti-slip matching tooth lines B along the height direction that mesh with the anti-slip tooth lines B. The upper connection end 22 of the bag skin 2 is parallel to the outside of the bag skin connection end B31 of the upper end cover 3 and overlapped. Since the outside of the bag skin connection end B31 has anti-slip tooth lines B and the upper connection end 22 has anti-slip matching tooth lines B, after being overlapped parallel to each other, the anti-slip tooth lines B and the anti-slip matching tooth lines B are engaged with each other for preliminary sealing.

[0032] In some embodiments, the upper buckle ring assembly 4 is composed of a plurality of clamping ring units B, and a strip-shaped clamping groove is provided between two adjacent clamping ring units B. The middle part of the upper buckle ring assembly 4 has a clamping cavity B, and the upper connecting end 22 of the bladder skin 2 is placed in the clamping cavity B of the upper buckle ring assembly 4; the clamping cavity B is enclosed by the inner walls of all the clamping ring units B. During assembly, the upper connecting end 22 of the bladder skin 2 is placed in the clamping cavity B of the upper buckle ring assembly 4, and then all the clamping ring units B are tightly connected and locked (matched clamps can be used to tighten and lock); in a preferred embodiment, each clamping ring unit B has a threading hole B, and the clamp locking rope is used to pass through the threading hole B in the shape of an "8" to clamp and lock. When all the clamping ring units B of the upper buckle ring assembly 4 are clamped and locked, the inner wall ends of all the clamping ring units B are tightly pressed against the upper connecting end 22 of the bladder skin 2. At the same time, the rubber skin part of the upper connecting end 22 forms a bladder skin clamping protrusion B221 (due to the squeezing between adjacent clamping ring units B, the bladder skin clamping protrusion B221 will be formed at the position of the strip clamping groove) and is squeezed and embedded into the strip clamping groove accordingly. When all the clamp pressure ring units B of the utility model are locked, the diameter of the clamp cavity B of the upper buckle ring assembly 4 is smaller than the upper connecting end 22 of the bladder skin 2. Therefore, the adjacent clamp pressure ring units B will squeeze the upper connecting end 22 of the bladder skin 2 and form a bladder skin clamp protrusion B221 in the strip pressure ring groove. At the same time, the bladder skin clamp protrusion B221 will be further embedded in the strip pressure ring groove. The two adjacent bladder skin clamp protrusions B221 embedded in the strip pressure ring groove will tightly form a sealing line segment B. The sealing line segment B is a tightened bladder skin segment B tightly tightened by the upper connecting end 22. The tightened bladder skin segment B is sealed between the inner wall of the upper buckle ring assembly 4 and the outer wall of the bladder skin connecting end B31. The tightened bladder skin segment B and the two wall surfaces (including the inner wall of the upper buckle ring assembly 4 and the outer wall of the bladder skin connecting end B31) are sealed tightly under pre-pressure, and there will be no air leakage. The upper connecting end 22 of the bladder skin 2 is evenly spaced around the circumference and has a plurality of bladder skin pressing hoop protrusions B221 (a tightening bladder skin segment B is formed between adjacent bladder skin pressing hoop protrusions B221, so that the upper connecting end 22 of the bladder skin 2 is evenly spaced around the circumference and has a plurality of tightening bladder skin segments B). Figure 7As shown, all the bladder skin pressing hoop protrusions B221 form two discontinuous bladder skin pressing hoop sealing lines B222 (because the tightened bladder skin segment B has upper and lower edges, two discontinuous bladder skin pressing hoop sealing lines B222 are formed).

[0033] In some embodiments, the lower connection end 21 of the bladder skin 2 is sealed and overlapped with the bladder skin connection end A11 of the piston base 1 and is sealed by the lower buckle ring assembly 5. Figure 4 The outer wall of the bladder skin connection end A11 is provided with anti-slip tooth lines A along the height direction, and the outer wall of the lower connection end 21 is provided with anti-slip matching tooth lines A along the height direction, which mesh with the anti-slip tooth lines A. The lower connection end 21 of the bladder skin 2 is parallel to and overlaps the outer surface of the bladder skin connection end A11 of the piston base 1. Since the outer surface of the bladder skin connection end A11 has anti-slip tooth lines A and the lower connection end 21 has anti-slip matching tooth lines A, after being overlapped in parallel with each other, the anti-slip tooth lines A and the anti-slip matching tooth lines A mesh with each other to achieve preliminary sealing. Figure 5 As shown, the lower clamping ring assembly 5 is composed of a plurality of clamping ring units A51. There is a rotary clamping groove 52 between two adjacent clamping ring units A51, and the rotary clamping groove is generally S-shaped. The middle part of the lower clamping ring assembly 5 has a clamping cavity A, and the lower connecting end 21 of the bladder skin 2 is placed in the clamping cavity A of the lower clamping ring assembly 5; the clamping cavity A is surrounded by the inner walls of all the clamping ring units A51. During assembly, the lower connecting end 21 of the bladder skin 2 is placed in the clamping cavity A of the lower clamping ring assembly 5, and then all the clamping ring units A51 are tightly connected and locked (matched clamps can be used to tighten and lock); in a preferred embodiment, each clamping ring unit A51 has a threading hole A, and the clamp locking rope is passed through the threading hole A in the shape of an "8" to clamp and lock.

[0034] When all the clamping ring units A51 of the lower buckle ring assembly 5 are clamped and locked, the inner wall ends of all the clamping ring units A51 are tightly pressed against the lower connecting end 21 of the bladder skin 2, and at the same time, the rubber cortex part of the lower connecting end 21 forms a bladder skin clamping protrusion A211 and is correspondingly squeezed and embedded into the spin-type clamping groove 52. When all the clamping ring units A51 of the utility model are locked, the diameter of the clamping cavity A of the lower buckle ring assembly 5 is smaller than the lower connecting end 21 of the bladder skin 2, so the adjacent clamping ring units A51 will squeeze the lower connecting end 21 of the bladder skin 2 and form the bladder skin clamping protrusion A211 in the spin-type clamping groove 52 (due to the squeezing between the adjacent clamping ring units A51, the bladder skin clamping protrusion A211 will be formed at the position of the spin-type clamping groove 52), and at the same time, the bladder skin clamping protrusion A211 will be further embedded into the spin-type clamping groove 52. In the press-type clamp groove 52, two adjacent bladder skin clamp protrusions A211 embedded in the spin-type clamp groove 52 will tightly form a sealing line segment A. The sealing line segment A is a tightened bladder skin segment A tightly tightened by the lower connecting end 21. The tightened bladder skin segment A is sealed between the inner wall of the lower buckling ring assembly 5 and the outer wall of the bladder skin connecting end A11. The tightened bladder skin segment A and the two wall surfaces (including the inner wall of the lower buckling ring assembly 5 and the outer wall of the bladder skin connecting end A11) are tightly sealed under pre-pressure, and there will be no air leakage. The lower connecting end 21 of the bladder skin 2 has several bladder skin clamp protrusions A211 evenly spaced around the circumference (a tightened bladder skin segment A is formed between adjacent bladder skin clamp protrusions A211, so that the lower connecting end 21 of the bladder skin 2 has several tightened bladder skin segments A evenly spaced around the circumference). Figure 8 As shown, all the bladder skin pressure hoop protrusions A211 form two discontinuous and mutually offset bladder skin pressure hoop sealing lines A212 (because the tightened bladder skin segment A has upper and lower edges, two discontinuous and mutually offset bladder skin pressure hoop sealing lines A212 are formed).

[0035] The piston base 1 of this utility model is equipped with an air nozzle 6 that communicates with the internal cavity of the bladder 2. A sealing ring A7 is mounted on the lower end of the piston base 1 for sealing with the shock absorber's oil storage cylinder. When the lower end of the piston base 1 is sealed with the shock absorber's oil storage cylinder, the sealing ring A7 provides a sealing connection. A sealing ring B8 is mounted in the center of the upper end cap 3 for sealing with the shock absorber's piston rod. When the upper end cap 3 is sealed with the shock absorber's piston rod, the sealing ring B8 provides a sealing connection.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sleeve-type air spring system with a spinning-type bladder and a pressure hoop seal, characterized by: The invention comprises a piston base (1), a bladder skin (2) and an upper end cover (3), wherein the upper end of the piston base (1) has a bladder skin connecting end A (11), the lower end of the upper end cover (3) has a bladder skin connecting end B (31), the upper and lower ends of the bladder skin (2) respectively have an upper connecting end (22) and a lower connecting end (21), the upper connecting end (22) of the bladder skin (2) and the bladder skin connecting end B (31) of the upper end cover (3) are sealed and overlapped and sealed by an upper buckle ring assembly (4); the lower connecting end (21) of the bladder skin (2) and the bladder skin connecting end A (11) of the piston base (1) are sealed and overlapped and sealed by a lower buckle ring assembly (5); the lower buckle ring assembly (5) is composed of a plurality of clamping ring units A (51), and a spinning type clamping groove (52) is provided between two adjacent clamping ring units A (51), and the spinning type clamping groove is generally S-shaped.

2. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 1, characterized in that: The lower buckling ring assembly (5) has a hoop cavity A in the middle, and the lower connecting end (21) of the bag skin (2) is placed in the hoop cavity A of the lower buckling ring assembly (5); the hoop cavity A is formed by the inner walls of all the hoop pressure ring units A (51).

3. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 1, characterized in that: The upper buckle pressing ring assembly (4) is composed of a plurality of clamping ring units B, and a strip-shaped clamping groove is provided between two adjacent clamping ring units B; the middle of the upper buckle pressing ring assembly (4) has a clamping cavity B, and the upper connecting end (22) of the bag skin (2) is placed in the clamping cavity B of the upper buckle pressing ring assembly (4); the clamping cavity B is enclosed by the inner walls of all the clamping ring units B.

4. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 1, characterized in that: The outer wall of the bag skin connecting end A (11) is provided with anti-skid tooth lines A distributed along the height direction, and the outer wall of the lower connecting end (21) is provided with anti-skid matching tooth lines A that mesh with the anti-skid tooth lines A distributed along the height direction.

5. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 1, characterized in that: The outer wall of the bag skin connecting end B (31) is provided with anti-skid tooth lines B distributed along the height direction, and the outer wall of the upper connecting end (22) is provided with anti-skid matching tooth lines B that mesh with the anti-skid tooth lines B distributed along the height direction.

6. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 2, characterized in that: When all the clamping ring units A (51) of the lower buckle ring assembly (5) are clamped and locked, the inner wall ends of all the clamping ring units A (51) are tightly pressed against the lower connecting end (21) of the bladder skin (2), and at the same time, the rubber skin portion of the lower connecting end (21) forms a bladder skin clamping protrusion A (211) and is correspondingly squeezed and embedded into the spin-type clamping groove (52).

7. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 6, characterized in that: The lower connecting end (21) of the bladder skin (2) is provided with a plurality of bladder skin pressing hoop protrusions A (211) uniformly spaced in a circumferential manner, and all of the bladder skin pressing hoop protrusions A (211) form two discontinuous and mutually offset bladder skin pressing hoop sealing lines A (212).

8. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 3, characterized in that: When all the clamping ring units B of the upper buckle ring assembly (4) are locked, the inner wall ends of all the clamping ring units B are tightly pressed against the upper connecting end (22) of the bladder skin (2), and at the same time, the rubber skin portion of the upper connecting end (22) forms a bladder skin clamping protrusion B (221) and is correspondingly squeezed and embedded into the strip clamping groove.

9. The sleeve-type air spring system with a spinning-type bladder-skin pressure-hoop seal according to claim 8, characterized in that: The upper connecting end (22) of the bladder skin (2) is provided with a plurality of bladder skin pressing hoop protrusions B (221) distributed evenly at intervals in a circumferential manner, and all the bladder skin pressing hoop protrusions B (221) form two discontinuous bladder skin pressing hoop sealing lines B (222).

10. The sleeve-type air spring system with a spinning bladder and a pressure hoop seal according to claim 1, characterized in that: The piston base (1) is provided with an air nozzle (6) communicating with the internal cavity of the bladder skin (2); the lower end of the piston base (1) is provided with a sealing ring A (7) for sealing with the oil storage cylinder of the shock absorber, and the center of the upper end cover (3) is provided with a sealing ring B (8) for sealing with the piston rod of the shock absorber.

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