DE10123896A1 - Vibration damper has sleeve into which working cylinder with foot valve fits which is held in place by clip, transition between sleeve and clamping zone being made up of beveled sections - Google Patents

Abstract

The vibration damper has a sleeve (1) into which a working cylinder (2) with foot valve (3) fits. This is held in place by a clip (9). The transition between the sleeve and clamping zone is made up of beveled sections (4, 5), each of which is made up of two sections (6, 7) of different slopes.

Description

The invention relates to a vibration damper with a container tube for receiving a working cylinder with a bottom valve, the container tube is connectable with a fastener, between the point of Attachment of the fastening element to the container tube and the container tube even a transition area is arranged, which consists of conical bevels can exist.

Vibration dampers are already known (Reimpell, Fahrwerktechnik 1974 , page 42), in which the container tube is supported on a weld-in base, and a bottom valve is arranged inside the container tube, on which the working cylinder is held, so that between the working cylinder and the container tube a compensation room is created. In these embodiments, welded-in shelves are used, the wall thickness of which, in contrast to the working cylinder and container tube, is thicker. The necessary section modulus in the axial direction is achieved in this way.

Vibration dampers are also known (e.g. DE-GM 92 08 620, GB-PS 704.671), where a single-tube shock absorber is shown without a bottom valve is. The tube ends are drawn in spherically, so that a smaller one Inner pipe diameter can be achieved by using a bottom is welded or the welding area is reduced accordingly, so that  to adhere to the heat generated during welding as little as possible. The problem of Support for a valve base has not existed in these embodiments.

The invention has set itself the task of having a vibration damper a container tube so that a transition area between a cylindrical part of the container tube and a fastener Resistance moment, which the risk of breakage of this transition area reduced to a minimum.

To solve this problem it is provided that the transition area from one Bottom on the cylindrical part of the container tube from several stages each of which has a first conical slope and a second has a conical bevel. The steps run in steps and go from a point at the bottom of the container tube and sit radially outwards concentrically continued, the diameters of the respective slopes being so long enlarge until they reach a diameter that corresponds to the diameter of the Corresponds to the container tube.

The division of the transition area into several stages has the advantage that the high bending and compressive forces emanating from the fastening element do not have larger ring areas must be caught by conical bevels, but that after the introduction of the high forces into the first plate-shaped radial outside slope of the first stage immediately from the second essentially second slope extending in the axial direction of the container tube is derived and only a fraction of this into the slopes of the second stage is passed on. For this reason, the same printing and Bending forces in the container tube, but they are used under the special elasticity of the proposed construction in each individual  Partial forces disassembled and in this way less dangerous to breakage made this point.

The conical bevels that extend radially outwards in a plate shape preferably an inclination with respect to a central axis of the container tube between 20 and 70 degrees, while being substantially parallel to Central axis extending second slopes of the respective steps to this Center axis have an inclination between 10 and 20 degrees.

In this context, an alternative to attaching a Fastening element on a container tube has a transition area, the between the point of attachment of the fastener and the cylindrical part of the container tube for the case of a larger one Distance of the place of attachment from the cylindrical part of the container tube there is an elongated indent whose contour contains at least one step, wherein the fastener facing side of the feeder Has widening. Such an expansion leaves the transition area easy and appear slim, with the strength of this transition area under Utilizing high elasticity achieved a high level and in place the fastening of the fastener is sufficiently large and therefore offers secure circulation. It follows from the proposed construction Possibility, in particular inside the container tube by the design first stage to realize a seat that center the cylinder and can accommodate, by the order of the federal government to the ground there is sufficient space for the function of a bottom valve.

Based on exemplary embodiments, a vibration damper with a Working cylinder explained.  

Show it:

Fig. 1 shows a vibration damper, comprising a container tube with two stages and a bottom and a working cylinder arranged therein with a bottom valve in partial section

Fig. 2 shows a container tube with a transition region between a fastening element and the cylindrical part of the container tube for the case of a greater distance from the point of attachment of the fastening element to the cylindrical part of the container tube.

If 1 denotes a container tube, it has between its cylindrical part and a base 8 two steps 4 and 5 , each consisting of a first conical bevel 6 and a second conical bevel 7 . A fastening element 9 can be connected to the base 8 by means of a weld 10 , the base 8 being connected to the first conical bevel 6 of the first step 4 via a collar 11 . Steps 4 and 5 thus run from the bottom 8 , which is smaller in diameter, to the outside radially until the second conical bevel 7 of the second step 5 has reached the cylindrical part of the container tube 1 . To achieve a minimal risk of breakage, the first conical bevels 6 have a first angle 12 which is between 60 and 70 degrees of angle with respect to a central axis 14 of the vibration damper. The second conical bevels adjoining the first conical bevels each have a second angle 13 with respect to the central axis 14 , which is between 10 and 20 degrees. Referring to FIG. 1, the container tube in its interior a working cylinder 2 having a bottom valve 3, whereby the working cylinder 2 is supported in a seat 15 which can be stamped on the place of connection of the first conical bevel 6 with the second conical bevel 7 ,

Referring to FIG. 2, a reservoir tube 21 is illustrated, which has a relatively catch the transition region between its cylindrical end, and a fastener 9, which is designed as a feeder 20 and then a first stage 24 and a second stage 25 having the above-described improvements in the bring with them the fear of breakage. The indentation at its end toward the fastening element 9 has a widening 23 , which makes it possible to place the weld 10 on a broader base on the one hand and, on the other hand, to spread the high forces to the steps 24 and 25 described above, the indentation 20 has a favorable construction in terms of its elasticity in the hook area.

The advantage of the invention lies in the laying of the pressure and bending forces, which are brought about by stages 3 , 4 and 24 , 25 , which emanate from the fastening element 9 and are passed onto the container tube 2 , 21 . The design therefore enables a decisive improvement in the risk of breakage at the points in which the fastening element 9 is fastened to the container tube 1 , 21 , it being possible to dispense with increasing the wall thickness on all cross sections.

LIST OF REFERENCE NUMBERS

1

container tube

2

working cylinder

3

bottom valve

4

first stage

5

second step

6

first conical bevel

7

second conical bevel

8th

ground

9

fastener

10

welding

11

Federation

12

first angle

13

second angle

14

central axis

15

Seat

20

Indent

21

container tube

22

step

23

widening

24

first stage

25

second step

Claims (7)

1. Vibration damper with a container tube for receiving a working cylinder with a bottom valve, the container tube being connectable with a fastening element, a transition area being arranged between the location of the fastening element on the container tube and the container tube itself, which may consist of conical bevels , characterized in that the transition area from a base ( 8 ) to the cylindrical part of the container tube ( 1 ) consists of several steps ( 4 , 5 ), each of which has a first conical bevel ( 6 ) and a second conical bevel ( 7 ). 2. Vibration damper according to claim 1, characterized in that the bottom ( 8 ) is delimited by a collar ( 11 ) which runs concentrically to the container tube ( 1 ) and opens into the first conical bevel ( 6 ) which extends in a plate shape radially outwards and with the adjoining one essentially concentric to the container tube ( 1 ), the second conical slope ( 7 ) forms the first step ( 4 ). 3. Vibration damper according to one of claims 1 to 3, characterized in that a first angle ( 12 ), which forms the first conical bevel ( 6 ) to a central axis ( 14 ) of the vibration damper, is between 60 and 70 degrees. 4. Vibration damper according to claim 1 or 2, characterized in that between the first stage ( 4 ) and the container tube ( 1 ) at least one second stage ( 5 ) is arranged. 5. Vibration damper according to one of the preceding claims, characterized in that a second angle ( 13 ) which the second conical bevel ( 7 ) to the central axis ( 14 ) forms, is between 10 and 20 degrees. 6. Vibration damper according to claim 1, characterized in that one of the steps ( 4 ) inside the container tube ( 1 ) has a seat ( 15 ) for the working cylinder ( 2 ) between the first conical bevel ( 6 ) and the second conical bevel ( 7 ) having. 7. Vibration damper with a container tube for receiving a working cylinder with a bottom valve, the container tube being connectable to a fastening element, a transition area being arranged between the location of the fastening element on the container tube and the container tube itself, which may consist of conical bevels , characterized in that the transition region between the point of attachment of the fastening element ( 9 ) and the cylindrical part of the container tube ( 21 ) in the event of a greater distance of the point of attachment from the cylindrical part of the container tube ( 21 ) from a feeder ( 20 ), the contour of which contains at least one step ( 22 ), the side of the feeder ( 20 ) facing the fastening element having an expansion ( 23 ).