DE102019209758B3 - Damping valve for a vibration damper - Google Patents

Abstract

Damping valve for a vibration damper, comprising a damping valve body with at least one passage, the outlet opening of which is at least partially covered by at least one elastic valve disc, characterized in that a spacer ring is attached to the valve disc on the side facing away from the outlet opening, on which an axially pretensioned spring washer is supported , wherein a contour of the spacer ring carrying the spring washer, viewed over the circumference, has a different distance from the central axis of the damping valve body.

Description

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

The DE 103 47 204 B4 describes a damping valve for a vibration damper, in which several layered, annular valve discs are combined in a package. The package is held together, for example, by means of a section-wise weld.

The welding requires a minimum dimension between an inside and an outside diameter of the valve disks welded together. The minimum dimension is determined by a welding tool or the welding point.

Damping valve bodies are increasingly being used for damping valves, which promote a targeted lifting behavior of a valve disk area. For this purpose z. B. used valve seat surfaces with an oval contour. A fundamental disadvantage of these oval valve seat surfaces is that one has to accept a certain loss of surface area in the pressurized surface of the valve disc. This disadvantage also occurs with valve seat surfaces with a meandering course. An example here would be EP 2 614 271 A1 to call.

The DE 10 2014 203 842 A1 shows a solution in which a closing force for the valve disc is applied by means of a conical spring which has an eccentric force application point and thus ensures an asymmetrical lifting behavior of the valve disc.

The JP 2006 - 194 336 A describes a damping valve for a vibration damper, comprising a damping valve body with at least one passage. An outlet opening of the passage is at least partially covered by at least one elastic valve disk, the valve disk being attached to the side facing away from the outlet opening with a spacer ring on which an axially pretensioned spring washer is supported. The supporting contour of the spacer ring, with its triangular basic shape, has a different distance from the central axis of the damping valve body when viewed over the circumference. The spacer ring is connected to an inner valve disk with a smaller diameter via a form fit.

The object of the present invention is to promote an asymmetrical lift behavior of a valve disk, wherein the damping valve body may also have annular valve seat surfaces.

The object is achieved by the features of claim 1.

The force application point of the downstream pretensioning disk shifts over the different distance. Consequently, a damping valve body can be used with any contour of the valve seat surface, so that no changes whatsoever are necessary on the damping valve body in order to achieve the advantageous, targeted lifting behavior of the valve disk from the damping valve body. The contour can be formed by a support line or a support surface and is dependent on the cross section of the spacer body.

In addition to the already described effect of the force application point of the pretensioning disk, the different widths of the spacer ring also generate different mechanical support or a different bending resistance torque, which allows the valve disk to lift off in a targeted manner at a peripheral area.

For an optimized installation space requirement of the form-fit connection, the spacer ring surrounds the valve disc on the outside.

In one embodiment, the spacer ring has at least one groove area for receiving an outer edge of the valve disc.

Additionally or alternatively, the valve disk can have at least one recess for receiving a section of the spacer ring. This prevents a relative rotational movement between the spacer ring and the valve disc.

The spacer ring can optionally be formed from a round wire. A rolling movement of the pretensioning disk on the spacer disk can thereby be absorbed more easily. Furthermore, the round wire is advantageous in the case of a spacer ring running on both sides of the valve disk, since a curved or twisted spacer ring always has an identical cross section and an identical support height.

Another option is that the spacer ring is at an axial distance from the valve disk on a circumferential area, at least in the axially unstrained state. The spacer ring can then itself develop a spring force which is directed in opposition to the prestressing disk and can partially compensate for the prestressing force of the prestressing disk.

The invention is to be explained in more detail using the following description of the figures.

• 1 Längsschnitt durch einen Schwingungsdämpfer im Bereich eines Dämpfventils
• 2 Draufsicht auf Distanzring nach 1
• 3 Seitenansicht zur 2
• 4 Erfindungsgemäße Ausführung eines Dämpfventils
• 5 Erfindungsgemäße Alternativvariante

It shows:

• 1 Longitudinal section through a vibration damper in the area of a damping valve
• 2 Top view of spacer after 1
• 3 Side view to 2
• 4th Design according to the invention of a damping valve
• 5 Alternative variant according to the invention

The 1 shows a damping valve 1 for a vibration damper of any design. The damping valve 1 includes a damper valve body 3 attached to a piston rod 5 is attached. The invention is not limited to such an embodiment and can e.g. B. be used in a bottom valve or in the context of an adjustable damping valve.

The damping valve body 3 divides a cylinder 7th of the vibration damper into a working space on the piston rod side and a working space away from the piston rod 9 ; 11 , both of which are filled with damping medium. In the damper valve body 3 are passage channels 13 ; 15th for one direction of flow in each case on different pitch circles. The design of the passage channels is only to be regarded as an example. An exit side of the passage channels 13 ; 15th is with at least one valve disc 17th ; 19th at least partially covered on a valve seat surface 21st ; 23 is biased.

With the valve discs 17th If a valve disk package is used, the individual valve disks, deviating from the illustration, can definitely have a different outer diameter.

For comparison, see the valve disc 19th a connection of an elastic valve disc 19th and an elastic spacer ring 25th provided. On the back of the spacer ring 25th , based on the outlet opening of the passage channel 15th , is the valve disc 19th arranged and by means of a clamping ring 27 in connection with a spring washer 29 biased. The spacer ring 27 has a larger inside diameter than a piston rod journal 31 so that an annular space 33 for deformation of the spring washer 29 is available. Consequently, the spring washer lies 29 not fully on the spacer ring 25th due to the rectangular cross-section in the area of the inner diameter on the spacer ring 25th from. For the lever arm of the spring force of the spring washer 29 the inside diameter is therefore always decisive.

In this exemplary embodiment, the fastening ring is formed by a piston nut. Alternatively, a locking ring or a locking or setting head of a rivet connection, for example on a bottom valve, would also be conceivable.

In the synopsis of 1 with the 2 it can be seen even more clearly that the load-bearing inner edge of the spacer ring 25th a different distance a over the circumference; A to a central axis 35 of the damping valve body. The spacer ring indicates this 25th A different radial width B over the circumference. The spacer ring 25th even a slot 37 exhibit.

The 2 shows a possible connection technology between the valve disc 19th and the spacer ring 25th . In this embodiment there is between the spacer ring 25th and the valve disc 19th a welded joint 39 , which is preferably carried out in the circumferential area of the spacer ring with the largest radial width B. The welded joint 39 is used to handle both ring elements 19th ; 25th during assembly. In the clamped state within the damping valve 1 then no relevant radial forces occur that affect the spacer ring 25th relative to the valve disc 19th move.

In the side view after 3 is a possible combination of the valve disc 19th with the spacer ring 25th according to 2 executed. The spacer ring 25th at least in the axially unstrained state on a circumferential area 41 an axial distance to the valve disc 19th exhibit. This feature can be used to partially access the spring washer 29 a counterforce is exerted when the valve disc 19th together with the spacer ring 25th is braced. This counterforce leads to a correspondingly reduced hydraulic pressure force at the outlet opening of the passage channel 15th is necessary to the valve disc 19th from the valve seat surface 23 of the damping valve body 3 take off.

The 4th discloses an embodiment of the invention in which the spacer ring 25th the valve disc 19th encompassed on the outside and thus a form fit 43 generated. In the valve disc 19th is at least one edge recess 45 to record a section 47 of the spacer ring 25th executed. In principle, the recess does not have to be placed at the edge, as in the right area of the 4th is recognizable. A recess on the edge 45 simplifies the assembly process of the spacer ring 25th with the valve disc 19th . The recess 45 is in the right area of the 4th deliberately made circular to show that the spacer ring 25th can sensibly also have a round cross section. The spacer ring 25th Although this variant has a constant cross-section, the recesses are 45 at a different distance a; A to the central axis 35 placed, resulting in a different distance of line contact between the spring washer 29 and the spacer ring 25th adjusts.

The 5 shows a connection of the spacer ring 25th with the valve disc 19th where the spacer ring 25th the valve disc 19th also encompassed on the outside and a groove area 49 to accommodate the outer edge of the valve disc 19th having. In this version, too, the spacer ring 25th be slotted. Due to the cross-sectional shape of the spacer ring, the distance a; A of the load-bearing inner edge to the central axis 35 of the damping valve body 3 can be varied.

Assuming a constant hydraulic pressure point starting from the outlet opening on the valve disc 19th off, then changes in all variants according to the 2 to 5 the distance a; A the support of the spring washer 29 on the spacer ring 25th . The smaller the distance a, the smaller the lever arm for the compressive force of the damping medium on the spring washer 29 to the valve disc 19th against the force of the spring washer 29 lift off from the damping valve body. As a result, the valve disc lifts 19th defined first in the area of the slot shown 37 or the greatest distance A from.

List of reference symbols

1

Damping valve

3

Damper valve body

5

Piston rod

7th

cylinder

9

Working space on the piston rod side

11

Working area remote from the piston rod

13

Passage channel

15th

Passage channel

17th

Valve disc

19th

Valve disc

21st

Valve seat surface

23

Valve seat surface

25th

Spacer ring

27

Tension ring

29

Spring washer

31

Piston rod journal

33

free space

35

Central axis

37

slot

39

Welded joint

41

Scope

43

Form fit

45

Recess

47

section

49

Groove area

Claims (5)

Damping valve (1) for a vibration damper, comprising a damping valve body (3) with at least one passage (13), the outlet opening of which is at least partially covered by at least one elastic valve disc (19), the valve disc (19) having a side facing away from the outlet opening Spacer ring (25) is attached, on which an axially pretensioned spring washer (29) is supported, a contour of the spacer ring (25) bearing the spring washer (29) at a different distance (a; A) from the central axis (35) when viewed over the circumference. of the damping valve body (3) and the spacer ring (25) is connected to the valve disc (19) via a form fit (43), characterized in that the spacer ring (25) surrounds the valve disc (19) on the outside. Damping valve after Claim 1 , characterized in that the spacer ring (25) has at least one groove area (49) for receiving an outer edge of the valve disc (19). Damping valve according to the generic term of Claim 1 , characterized in that the valve disc has at least one recess (45) for receiving a section (47) of the spacer ring (25). Damping valve according to one of the Claims 1 - 3 , characterized in that the spacer ring (25) is formed by a round wire. Damping valve according to one of the Claims 1 - 4th , characterized in that the spacer ring (25) is at an axial distance from the valve disc (19) on a circumferential area (41) at least in the axially unstrained state.

Images