CN113167353A

CN113167353A - Damping valve for vibration damper

Info

Publication number: CN113167353A
Application number: CN201980080179.7A
Authority: CN
Inventors: K·施密茨; A·克内泽维奇; J·罗塞勒
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2018-12-07
Filing date: 2019-12-04
Publication date: 2021-07-23
Anticipated expiration: 2039-12-04
Also published as: WO2020115144A2; CN113167353B; WO2020115144A3; DE102018221224B4; DE102018221224A1

Abstract

A damping valve for a vibration damper, the damping valve comprising a damping valve body having at least one through passage, the outlet opening of which is covered by at least one valve disc, wherein the valve disc is formed in the closing direction by at least one elastic body The element is preloaded, at least one elastomeric element is supported on the support plate, wherein the elastomeric element has node webs from which at least two spring webs extend obliquely.

Description

Damping valve for vibration damper

Technical Field

The present invention relates to a damping valve for a vibration damper according to the preamble of patent claim 1.

Background

DE 102016218375 describes a damping valve in which the valve disk executes a lifting movement against the ejection force of an elastomer element or elastomer elements. The elastomer element has, for example in the embodiment according to fig. 9, a circular cross section with an extrusion chamber. The extrusion chamber is filled with a damping medium and has radial outflow openings.

A fundamental problem with elastomeric elements in such applications is that the elastomeric elements typically have too little elasticity due to too high a shore hardness. Fatigue strength issues may arise at the lower shore hardness associated with this design.

A plurality of valve disks or also spring disks (including also the spider spring) are usually arranged in a disk stack in the damping valve. For a better assembly, it is known to connect the valve members to one another by spot welding, as described in DE 10347204B 4. The connection only needs to withstand the load of the assembly. In the assembled state, the components are held by tensioning the chain. Welding is often critical due to the material properties of the valve disc. Further, the material properties partially change by spot welding.

Disclosure of Invention

The invention aims to reduce the spring rate of an elastic element under the condition that the fatigue strength is sufficiently high. Another sub-purpose is an alternative connection technique between layered valve members.

This object is achieved by: the elastomer element has a node web from which at least two spring webs extend obliquely.

The elastomer element thus has at least two spring sections. The first spring section is formed by at least two spring webs which can already be deformed when the load is low. The node webs form a second spring section which has a significantly greater spring rate. A defined direction of deformation exists due to the inclined position of the spring section.

In one embodiment, the elastomeric element has a Y-shaped cross-section. The V-shaped spring webs increase the enclosed spread angle under load. If the maximum expandability of the expansion angle is reached, the spring action of the gusset begins to work.

In a further advantageous embodiment, the individual webs can have a conical cross section on the main axis of the elastomer element. Furthermore, the spring characteristics of the elastomeric element may also vary.

Alternatively, the elastomer element may also have an x-shaped cross-section. More spring tabs are then also provided, so that the load on the elastomeric element can be better distributed.

Furthermore, it is possible for the spring webs to extend radially from the node webs. Thereby, the number of spring webs can be increased again.

Optionally, at least one tab of the elastomeric element forms a plug connection with one of the disks making contact. Thus, the elastomeric element is fitted in a non-loss manner within the damping valve.

In a further advantageous embodiment, the disk is penetrated by the elastomer element in the presence of a plug connection.

Furthermore, it can be provided that the fastening head of the elastomer element bears against a side of the disk facing away from the spring web. Thus, the elastomeric element is fixed such that a preassembly of the elastomeric element with the carrier disc can be performed without having to worry about the elastomeric element falling out of the carrier disc.

The sub-group of connecting a plurality of valve elements is realized by: an elastomeric member interconnects the plurality of valve discs into a disc stack.

In this fastening technique, no structural changes of the valve disk known from the prior art occur. Another advantage is that no complicated welding techniques have to be tried to use these elastomer elements.

An option associated with this is to arrange a spacer as part of the elastomer element between two adjacent valve disks in the disk stack. Thus, the valve disks do not have to be in complete contact with one another, but can also be positioned by the spacer.

In a further advantageous embodiment, the disk stacks are connected by a plurality of elastomer elements arranged in series, wherein each elastomer element connects only a part of the valve disks of the disk stacks to one another. The operating behavior of the valve disk or valve disks can thus be coordinated in a targeted manner.

When the spacer is embodied as a spring element, a further manipulated variable for adjusting the damping valve can be used.

Drawings

The invention shall be explained in detail with the aid of the following description of the figures.

In the drawings:

figure 1 shows a cross-sectional view of a damping valve,

figure 2 shows an alternative variant of figure 1,

figure 3 shows a top view of the damping valve,

fig. 4 shows another alternative embodiment of fig. 1.

Detailed Description

Fig. 1 shows a damping valve 1 for a vibration damper having any design. The damping valve 1 comprises a damping valve body 3 which is fixed on a piston rod 5. The invention is not limited to such an embodiment and can be used, for example, in a base valve or also in the context of an adjustable damping valve.

The damping valve body 3 divides the cylinder body 7 of the vibration damper into a working cavity at the side of the piston rod and a working cavity 9 far away from the piston rod; 11, both working chambers are filled with a damping medium. In the damping valve body 3, through-channels 13 for the respective throughflow direction; 15 are implemented on different sub-loops. The design of the through-channel is to be regarded as exemplary only. A through channel 13; the outlet side of 15 is at least partially covered by at least one valve disc 17; 19 are covered.

When the flow from the working chamber 11 remote from the piston rod to the valve disk 17 begins, the valve disk 17 lifts off its seat surface 21. The lifting movement is braked in a manner controlled or damped by the support disc 23 in combination with the elastomer support. The elastomeric support is formed from a plurality of elastomeric elements 25.

Fig. 1 shows various forms of elastomeric elements 25. Common to all variants is that the elastomer element 25 has a node web 27 from which at least two spring webs 29 extend at an angle.

In the left half section and in the right half section of fig. 1 in the left embodiment, the elastomer element 25 has a Y-shaped cross section. At least one tab of the elastomer element 25 (e.g., the node tab 27) forms a plug connection 31 with one of the contacting disks. In the left half-section, the valve disk 17 forms a plug connection 31, while the support disk 23 serves as a carrier for the plug connection 31. In principle, the plug connection 31 can also be formed by a blind opening in the valve disk 17 or in the support disk 23. However, with regard to the mounting reliability, it is better if the valve disk 17 or the support disk 23 is penetrated by the elastomer element 25 and if necessary the fastening head 33 of the elastomer element 25 rests against the side of the

disks

17, 23 facing away from the spring web 29.

In the embodiment according to fig. 2, the individual webs (again, the node webs 27) have a conical cross section on the main axis 35 of the elastomer element 25. During the lifting movement of the valve disk 17, the spring web 29 expands further until the node web 27 abuts the valve disk 17. Upon further compression, the spring rate increases incrementally due to the tapered shape of the individual or node tabs 27.

In the right half section of fig. 1, the elastomeric element 25 has an x-shaped cross section. In addition to the illustrated design with the plug connection 31, the elastomer element 25 can also be cured and can therefore be permanently connected to the valve disk 17 or the support disk 23. In the assembled state of the elastomer element 25, the position of the elastomer element 25 is fixed due to the permanent pretension between the support disk 23 and the valve disk 17. Therefore, position fixing may not be required.

A further embodiment is to be explained with the aid of fig. 3. In fig. 1 and 2, the spring webs 29 are shown in only one plane. As can be seen, for example, from the plan view of the support disk 23, the spring webs 29 can also extend radially from the node webs 27. The amount of closing force that the elastomer element 25 distributes to the valve disk 17 can be set by the number and design of the spring webs 29. This makes it possible to define a lifting range over which valve disk 17 always lifts first from valve seat surface 21.

Fig. 4 is based on fig. 1. In the left half section of fig. 1, it has been shown: a disc pack 37 having a plurality of layered valve discs 17 may be held together by elastomeric member 25. Fig. 4 shows a further embodiment of this design principle, two adjacent valve disks 17a in disk stack 37; 17b are arranged with a spacer 39 therebetween as part of the elastomeric element 25. Thus, the valve disk 17 or also the star spring as a component of the same type does not necessarily have to be in full contact in the sense of the present invention. Furthermore, the spacer 39 is embodied as a spring element in the left half-section. The spacer 39 can have various shapes, wherein a spring is illustrated here by way of example as an alternative to the spacer 39.

Fig. 4 also illustrates that: the disk stack 37 can be connected by a plurality of elastomer elements 25 arranged in series, wherein each elastomer element 25 connects only the valve disks 17 a; 17 b; 17c are connected to each other. This results in a cascade-designed connection which enables a very specific displaceability of the valve disks 17a-c and thus a very large variation in the design of the disk stack 37. In the left half-section, the two valve disks are connected to one another by the radially outer elastomer element 25 via a spacer 39, and the two valve disks are connected to the third valve disk 17 b; 17c are directly connected to each other by the radially inner elastomer element 25, so that the entire disk stack 37 is held together by the interaction of the two elastomer elements 25.

In the right-hand half section, the radially inner elastomer element 25 even further connects a rigid or also elastic support disk 23 as a valve disk in the sense of the invention to the disk stack 37, wherein the spring web 29 is also supported on the valve seat 21 to achieve a damped closing movement of the disk stack 37.

List of reference numerals

1 damping valve

3 damping valve body

5 piston rod

7 cylinder body

9 working chamber on piston rod side

11 working chamber far away from piston rod

13 through passage

15 through passage

17 valve disk

19 valve disk

21 seat surface

23 support disc

25 elastomeric element

27 node connection piece

29 spring tab

31 plug connection

33 fixed head

35 main axis

37 disk group

39 space holder

Claims

1. A damping valve (1) for a vibration damper, comprising a damping valve body (3) having at least one through-channel (13; 15), the outlet opening of which is covered by at least one valve disk (17), wherein the valve disk (17) is prestressed in the closing direction by at least one elastomer element (25) which is supported on a support disk (23), characterized in that the elastomer element (25) has a node web (27), from which at least two spring webs (29) extend obliquely.

2. The damper valve according to claim 1, characterized in that the elastomer element (25) has a Y-shaped cross-section.

3. The damper valve according to claim 1, characterized in that a single tab (27) has a tapered cross section on a main axis (35) of the elastomeric element (25).

4. The damper valve according to claim 1, characterized in that the elastomer element (25) has an x-shaped cross-section.

5. The damper valve according to claim 1, characterized in that the spring webs (29) extend radially from the node webs (27).

6. Damping valve according to claim 1, characterized in that at least one tab (27) of the elastomer element (25) forms a plug connection (31) with one of the discs (17; 23) making contact.

7. Damper valve according to claim 6, characterized in that in the plug connection (31) the disc (17; 23) is penetrated by the elastomer element (25).

8. The damper valve according to claim 7, characterized in that the fastening head (33) of the elastomer element (25) bears against a side of the disk (17; 23) facing away from the spring web (29).

9. The damper valve according to claim 1, characterized in that the elastomer element (25) connects a plurality of valve discs (17; 17 a; 17 b; 17c) to each other in a disc pack (37).

10. A damper valve according to claim 9, characterised in that a spacer (39) is arranged as part of the elastomer element (25) between two adjacent valve discs (17 a; 17b) in the disc stack (37).

11. A damper valve according to claim 9, characterised in that the disc packs (37) are connected by a plurality of elastomer elements (25) arranged in series, wherein each elastomer element (25) connects only a part of the valve discs (17 a; 17 b; 17c) of the disc packs (37) to each other.

12. The damper valve according to claim 10, characterized in that the spacer (39) is designed as a spring element.