CN102261421A

CN102261421A - Shock absorber

Info

Publication number: CN102261421A
Application number: CN2011101256990A
Authority: CN
Inventors: A·阿尔策
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2010-05-11
Filing date: 2011-05-10
Publication date: 2011-11-30
Anticipated expiration: 2031-05-10
Also published as: DE102010028860A1; BRPI1102116A2; DE102010028860B4; CN102261421B

Abstract

The invention relates to a shock absorber, comprising a cylinder barrel, wherein a piston rod moves in a reciprocating manner in the cylinder barrel, a protective pipe is fixed relative to the position of the piston rod, the protective pipe surrounds the piston rod, a ring is arranged in an annular gap between the protective pipe and the cylinder barrel, the ring prevents pollutant from entering an annular chamber enclosed by the protective pipe, and an turbulence chamber is arranged in the ring along flowing in direction of the protective pipe.

Description

Vibration damper

Technical field

The present invention relates to a kind of vibration damper with protective tube as described in the preamble according to independent claims 1.

Background technique

Usually, the active chamber of vibration damper with zone that piston rod contacts in sealed by the rod seal part.If the wearing and tearing that the rod seal part is impaired or it is increased then obviously influence working life of vibration damper thus.Therefore, the manufacturing on the surface of piston rod and the roughness of rod seal part accurately are complementary on the one hand.On the other hand, the surface of piston rod is covered with respect to fixing regularly protection bellows of piston rod position or the protective tube that is prevented from external action.

In the vibration damper that is arranged on vertically basically in the traveling mechanism, guaranteed the protective action of protection bellows or protective tube reliably.It should be noted that herein obviously expensive in the rigid protecting pipe aspect the mounting cost, the internal diameter of described rigid protective pipe is usually greater than the external diameter of the outer cylinder of vibration damper as parts for flexible protection bellows.

In the vibration damper that is arranged on obliquely in the traveling mechanism, dust and salt fog can enter in the annular space between protective tube and the outer cylinder, and arrive the end regions of cylinder barrel, make dust and dirt arrive the surface of piston rod.Therefore cause that the wearing and tearing of vibration damper obviously increase.

By the known a kind of vibration damper of DE 104172A, described vibration damper has the Sealing between protective tube and outer cylinder.The sealing part is made of the ring of porous, and this ring has been realized in the inside of protective tube and the air exchange between the external environment condition, thereby prevent that pump efficiency should when piston rod is done the turnover motion with respect to cylinder barrel.Herein, the inwall of protective tube directly slides on the outer circumferential face of ring, forms permanent friction thus.Be deposited in dirt on the inwall of protective tube and cause the wearing and tearing that encircle, therefore weakened the function of ring again.

Summary of the invention

The objective of the invention is to, a kind of scheme simply and cheaply that is used for pollution problem described above and wear problem is provided.

Purpose of the present invention realizes by following measures, promptly encircles having the eddy current indoor type along the inflow direction that enters protective tube to be achieved.

The invention has the advantages that, can be implemented as the spaced radial that has with respect to cylinder barrel.The eddy current indoor type make piston rod movement and therefore in the protective tube motion air diverts of circulation to opening end direction towards protective tube.Test verifiedly, only just can avoid shadoweffect and prevent that dirt from entering along the direction of piston rod with the eddy current indoor type.

In another favourable design, eddy current indoor type distolateral in ring.Distolateral interior type can especially easily be made, because there is not undercutting.Thus, described ring can be made of plastics without a doubt.

The vortex chamber by around wall constitute, described wall along the axis of orientation of cylinder barrel to the bottom that extends to ring.

According to favourable dependent claims, wall is implemented as along the direction towards cylinder barrel, and makes the diameter of vortex chamber diminish along the direction towards the bottom.The air that flows into the vortex chamber is diverted, thereby produces the air cushion that surrounds the annular space between protective tube and the cylinder barrel.

Ring can be fixed on the cylinder barrel side.

For fixing, ring can be pressed on the cylinder barrel.As an alternative, will encircle and the cylinder barrel welding.

Another kind of fixed solution is, ring is the constituent element of lid, and described lid is supported on cylinder barrel distolateral.

The situation of installing obliquely with respect to piston rod and cylinder barrel for protective tube, perhaps for example when clearing the jumps deflection, described protective tube is centered smoothly, is convexity because the outside side face of ring is implemented towards the direction of protective tube inwall.

In substitute variants, ring is fixed on the protective tube in the inboard.

Wherein, the inwall of ring is towards radially inwardly being implemented as convexity, can not contact with cylinder barrel formation on scraping ground when protective tube is in oblique position.

Description of drawings

Describe the present invention in detail by means of the following drawings explanation.

Wherein:

Fig. 1 shows vibration damper with sectional view,

Fig. 2 shows the phantom of Fig. 1,

Fig. 3 shows as Fig. 1 of single-piece and the ring among Fig. 2,

Fig. 4 shows as the part of cap or as the ring of the part of protective tube.

Embodiment

Fig. 1 shows vibration damper 1, and it has inner cylinder tube 3 and outer cylinder 5.Inner cylinder tube 3 is by the damping medium, and for example oil is full of fully, and is sealed by piston rod guiding device 7 with outer cylinder 5.In principle, the present invention can be used in the vibration damper of arbitrary structures form.

In inner cylinder tube 3, can be provided with piston rod 9 with axial motion, and do axial to-and-fro motion.Piston rod 9 is supported with rigid protecting pipe 11, and this protective tube 11 comprises end cap 13 and body 15.Described body and piston rod 9 define the internal diameter of annular chamber 17 and body greater than outer cylinder 5, thereby form annular space 19 between two

parts

5,11.

Protective tube 11 should prevent the direct influence of dirt particle for piston rod 9.These dirt particles may be deposited on the piston rod 9 and wearing and tearing are fixed on rod seal part 21 in the piston rod guiding device 7.

As seen from Fig. 1, Fig. 2 and Fig. 3, in annular space 19, be provided with ring 23, this ring has eddy current indoor type 25 at the inflow direction that the edge enters in the protective tube.Eddy current indoor type distolateral in described ring.

Vortex chamber 27 by around wall 29 constitute, described wall 29 extends to the bottom 31 of ring 23 vertically towards the direction of cylinder barrel 5.The wall 29 that points to the direction of cylinder barrel 5 tilts, thereby makes the diameter of vortex chamber 27 along 31 direction diminishes towards the bottom.

In this embodiment, described ring for example is fixed on the cylinder barrel side by the press fit that particularly occurs in the ring 23 that is made of plastics, thereby can not damage the surface of outer cylinder when mounted.As an alternative, can be with ring 23 and cylinder barrel 5 welding.

Along in the to-and-fro motion of the direction of arrow, air is carried by the direction towards annular chamber 17 with dirt particle at piston rod 9 or protective tube 11.Air hits on eddy current indoor type 25, forms air cushion thus in vortex chamber 27, and this air cushion can extend to the inwall of protective tube, and this protective tube has with respect to the spaced radial of ring in the installation of routine and do not contact with ring 23 thus.

For protective tube 11 occupied with respect to certain oblique position of cylinder barrel and with the contacted situation of cylinder barrel; be implemented as towards the direction of the inwall of protective tube 11 to be convexity, to have prevented in twos the relative to each other damage of the

parts

11,5,23 of motion by encircling 23 outside side face 33.

Left half side sectional view by Fig. 4 as seen, as an alternative, ring 23 can be cover 35 constituent element, it is supported on cylinder barrel 5, and distolateral going up also will be encircled 23 thus and be fixed on the cylinder barrel 5.

In the right half side sectional view of Fig. 4, ring 23 is on the inwall of protective tube 11.For the same contact performance that realizes protective tube with respect to the surface smoothness of cylinder barrel, the inwall of ring 23 is implemented as convexity.In order to keep, on ring 23 ends that are set at away from end cap 13 with respect to total length like the traditional protection tubing.

Reference numerals list

1 vibration damper

3 inner cylinder tubes

5 outer cylinders

7 piston rod guiding devices

9 piston rods

11 protective tubes

13 end caps

15 bodys

17 annular chambers

19 annular spaces

21 rod seal parts

23 rings

25 eddy current indoor types

27 vortex chambers

29 walls

31 bottoms

33 outer circumferential faces

35 lids

Claims

1. a vibration damper (1) comprises cylinder barrel (3; 5); piston rod in this cylinder barrel (9) is carried out axially reciprocating; wherein with respect to described piston rod (9) fixed-site be provided with protective tube (11); this protective tube surrounds described piston rod (9); wherein be provided with ring (23) in the annular space (19) between described protective tube (11) and described cylinder barrel (5); described ring prevents that dirt from entering in the annular chamber (17) that is surrounded by described protective tube (11); it is characterized in that described ring (23) has eddy current indoor type (25) along the inflow direction that enters described protective tube (11).

2. according to the described vibration damper of claim 1, it is characterized in that described eddy current indoor type (25) is embodied in distolateral in the described ring (23).

3. according to the described vibration damper of claim 1, it is characterized in that, by around wall (29) constitute vortex chamber (27), described wall extends to the bottom (31) of described ring (23) vertically towards the direction of described cylinder barrel (5).

4. according to the described vibration damper of claim 3, it is characterized in that described wall (29) is implemented as towards the direction of described cylinder barrel (5), the direction of (31) diminishes towards the bottom to make the diameter of described vortex chamber (27).

5. according to the described vibration damper of claim 1, it is characterized in that described ring (23) is fixed in the cylinder barrel side.

6. according to the described vibration damper of claim 5, it is characterized in that described ring (23) and described cylinder barrel (5) welding.

7. according to the described vibration damper of claim 5, it is characterized in that described ring (23) is the constituent element of lid (35), the described lid is being supported on described cylinder barrel (5) distolateral.

8. according to the described vibration damper of claim 1, it is characterized in that the outside side face (33) of described ring (23) is implemented as and is being convexity on the direction of the inwall of described protective tube (11).

9. according to the described vibration damper of claim 1, it is characterized in that described ring (23) is fixed on the described protective tube (11) in the inboard.

10. according to the described vibration damper of claim 9, it is characterized in that the inwall of described ring (23) radially inwardly is implemented as convexity.