CN113167353B

CN113167353B - Damping valve for vibration damper

Info

Publication number: CN113167353B
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: 2023-06-30
Anticipated expiration: 2039-12-04
Also published as: WO2020115144A2; DE102018221224A1; CN113167353A; DE102018221224B4; WO2020115144A3

Abstract

A damping valve for a vibration damper, comprising a damping valve body having at least one through channel, the outlet opening of which is covered by at least one valve disk, wherein the valve disk is preloaded in the closing direction by at least one elastomer element, which is supported on a support disk, wherein the elastomer element has a node web 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. The damping valve comprises a damping valve body having at least one through channel, the outlet opening of which is covered by at least one valve disk, wherein the valve disk is preloaded in the closing direction by at least one elastomer element which is supported on a support disk.

Background

DE 10 2016 218 375 describes a damping valve in which a valve disk performs 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 a compression space. The extrusion chamber is filled with 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 the too high shore hardness. Fatigue strength problems may occur at the lower shore hardness associated with this design.

A plurality of valve discs or also spring discs (including also spider springs) are typically arranged within a disc stack in a damping valve. For a better assembly, it is known to connect the valve members to one another by spot welding, as described in DE 103 47 204b 4. The connection only needs to withstand the load of the assembly. In the assembled state, the component is held by the tensioning chain. Welding is often critical due to the material properties of the valve disc. Further, the material properties are partially changed by spot welding.

Disclosure of Invention

The object of the invention is to reduce the spring rate of an elastomer element when the fatigue strength is sufficiently high. Another sub-object is an alternative connection technique between layered valve members.

The aim is achieved by the following steps: the elastomer element has a node web from which at least two spring webs extend obliquely.

The elastomeric element thus has at least two spring sections. The first spring section is formed by at least two spring webs which can be deformed already at low loads. The node webs form a second spring section having a significantly greater spring rate. By means of the inclined position of the spring section, a defined deformation direction exists.

In one embodiment, the elastomeric element has a Y-shaped cross-section. The V-shaped arrangement of the spring webs increases the enclosed expansion angle under load. If the maximum expansibility of the expansion angle is reached, the spring action of the node web 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 elastomeric element may also have an x-shaped cross-section. Thus, more spring tabs are 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 tabs can be increased again.

Optionally, at least one tab of the elastomeric element is in plug connection with one of the discs that is in contact. The elastomeric element is thus fitted in a non-lost 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 is attached to the side of the disk facing away from the spring web. The elastomer element is thus fixed such that a preassembly of the elastomer element with the carrier disk can be performed without fear of the elastomer element falling out of the carrier disk.

The sub-objective of connecting a plurality of valve elements is achieved by: the elastomeric element 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 it is not necessary to try to obtain complex welding techniques to use these elastomeric elements.

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

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

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

Drawings

The invention is explained in detail with the aid of the following description of the drawings.

In the drawings:

FIG. 1 shows a cross-sectional view of a damping valve;

FIG. 2 shows an alternative variant of FIG. 1;

FIG. 3 shows a top view of a 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 desired design. The damping valve 1 comprises a damping valve body 3 which is fixed to a piston rod 5. The invention is not limited to this embodiment and may 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 chamber on the piston rod side and a working chamber 9 away from the piston rod; both working chambers are filled with damping medium 11. In the damping valve body 3, through passages 13 for the respective throughflow directions; 15 are implemented on different sub-loops. The design of the through-going channel is only to be regarded as exemplary. A through passage 13;15 is at least partially covered by at least one valve disk 17; 19.

When the flow starts from the working chamber 11, which is remote from the piston rod, to the valve disc 17, the valve disc 17 lifts from its valve seat surface 21. The lifting movement is braked in a controlled or damped manner by the support disc 23 in combination with the elastomer bearing. 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 obliquely.

In the left half section and in the right half section of fig. 1 in the left embodiment, the elastomeric element 25 has a Y-shaped section. At least one tab of the elastomer element 25 (for example, 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 the plug connection 31, while the support disk 23 serves as a carrier for the plug connection 31. In principle, the plug connection 31 may also be formed by a blind opening in the valve disk 17 or in the support disk 23. However, in terms of assembly reliability, it is better for the valve disk 17 or the support disk 23 to be penetrated by the elastomer element 25 and, if appropriate, for the fastening head 33 of the elastomer element 25 to abut against the side of the

disk

17, 23 facing away from the spring webs 29.

In the embodiment according to fig. 2, the individual webs (in turn 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 webs 29 expand further until the node webs 27 abut the valve disk 17. Upon further compression, the spring rate increases incrementally due to the conical shape of the individual tabs 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 embodiment with the plug connection 31, the elastomer element 25 can also be cured and can thus 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 disc 23 and the valve disc 17. Thus, no positional fixing may be required.

Another embodiment is to be described with reference to fig. 3. In fig. 1 and 2, the spring webs 29 are shown in only one plane. As can be seen, for example, in the top view of the support disk 23, the spring webs 29 can also extend radially from the node webs 27. The number and design of the spring webs 29 allow the magnitude of the closing force assigned to the valve disk 17 by the elastomer element 25 to be set. This can define a lifting range over which the valve disk 17 is always lifted from the valve seat surface 21 first.

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

With the aid of fig. 4, it should furthermore be explained that: the disk stack 37 can be connected by a plurality of elastomer elements 25 arranged in series, wherein each elastomer element 25 only covers the valve disk 17a of the disk stack 37; 17b;17c are connected to each other. This results in a cascade-like connection which enables a very specific movability of the valve disks 17a-c and thus a very large change in the design of the disk stack 37. In the left half section, the two valve disks are connected to one another by means of the radially outer elastomer element 25 via the spacer 39, while the two valve disks are connected to the third valve disk 17b;17c are directly connected to each other by means of the radially inner elastomer elements 25, so that the entire disc stack 37 is held together by the co-action of the two elastomer elements 25.

In the right-hand half section, the radially inner elastomer element 25 even connects the rigid or still elastic support disk 23, which is a valve disk in the sense of the invention, to the disk stack 37, wherein the spring webs 29 also bear on the valve seat surface 21 in order 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 channel

15. Through channel

17. Valve disc

19. Valve disc

21. Valve seat surface

23. Supporting disk

25. Elastomer element

27. Node connection piece

29. Spring tab

31. Plug connection

33. Fixing head

35. A main axis

37. Disk set

39. Spacing keeping piece

Claims

1. 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 preloaded 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 tab (27) from which at least two spring tabs (29) extend obliquely, wherein at least one node tab (27) of the elastomer element (25) forms a plug connection (31) with one of the valve disk (17) and the support disk (23) which is in contact.

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

3. Damping valve according to claim 1, characterized in that the node tab (27) has a conical cross section on the main axis (35) of the elastomer element (25).

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

5. Damping 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 in the plug connection (31) one of the valve disk (17) and the support disk (23) is penetrated by the elastomer element (25).

7. Damping valve according to claim 6, characterized in that the fastening head (33) of the elastomer element (25) is located against the side of one of the valve disk (17) and the support disk (23) facing away from the spring web (29).

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

9. Damping valve according to claim 8, characterized in that a spacer (39) is arranged as part of the elastomer element (25) between two adjacent valve discs (17 a;17 b) in the disc stack (37).

10. Damping valve according to claim 8, characterized in that the disc stack (37) is 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;17b;17 c) of the disc stack (37) to each other.

11. Damping valve according to claim 9, characterized in that the spacer (39) is designed as a spring element.