DE102018209211A1 - Damping valve arrangement for a motor vehicle vibration damper, as well as vehicle vibration damper - Google Patents

Abstract

The invention relates to a damping valve arrangement for a motor vehicle vibration damper, comprising a piston body with at least one fluid channel, which is covered by at least one valve disc arrangement, which exerts a spring force acting in the direction of the fluid channel on the piston body. The damper valve assembly is characterized by further comprising a throttle disk mounted between the piston body and the valve disk assembly and having at least one aperture connecting the fluid passage with the surface of the valve disk assembly facing the fluid passage and the damping valve assembly further comprising biasing means, which is positioned within the valve disc assembly and additionally biases it axially in the direction of the fluid channel. In addition, a motor vehicle vibration damper is disclosed which comprises a damping valve arrangement designed according to the invention.

Description

The invention relates to a Dämpfventilanordnung for a motor vehicle vibration damper according to the preamble of claim 1, and to a motor vehicle vibration damper with a Dämpfventilanordnung invention.

Generic damper valve assemblies for a motor vehicle vibration damper are widely used in the automotive industry. These generally comprise a damper piston, which is composed of a plurality of arranged on a support and axially against each other braced components. The components comprise at least one piston body with at least one fluid channel, as well as a, at least two valve discs comprehensive valve disc assembly which covers the fluid channel axially. The valve disc assembly exerts a force acting in the direction of the fluid channel spring force on the piston body.

The Dämpfventilanordnungen usually have either a progressive or a degressive damping characteristic.

A vehicle vibration damper is typically placed between a sprung and an unsprung mass and dampens the vibrations induced by the road bumps by plunging the piston rod into the damper cylinder filled with a damping medium, causing a defined damping medium flow through the damping valve assembly. The distance traveled by the piston rod is called stroke.

In a progressive Dämpfventilanordnung a motor vehicle vibration damper initially very sensitive and hardly attenuates, the damping force increases more and more, the deeper the piston rod dips into the damper cylinder.

In a degressively designed Dämpfventilanordnung, however, the force required to compress the damper and thus the damping effect at the beginning of the highest and is the lower the more stroke is covered by the piston rod.

Both of the above-described designs have the disadvantage that the stroke available for the piston rod is not completely utilized, that is, not effectively utilized.

From the aspect of the most effective Hubwegausnutzung a linearly tuned Dämpfventilanordnung is most suitable. This utilizes the available stroke particularly effective. For each Hubwegabschnitt the force required for the compression of the vibration damper is the same in a linearly tuned Dämpfventilanordnung.

However, a degressively designed damper valve arrangement has become the most widespread and most economical because of the large number.

The object of the present invention is therefore seen to further develop such a Dämpfventilanordnung, which basically has a degressive characteristic curve, so that thus a linear characteristic curve can be realized.

This object is achieved according to the invention in that the damping valve arrangement comprises an orifice plate which is mounted between the piston body and the valve disk arrangement and has at least one orifice plate breach, which connects the fluid channel with the surface of the valve disk arrangement facing the fluid channel and in that the damping valve arrangement also has a pretensioning device, which is positioned within the valve disc assembly and increases the force acting in the direction of the fluid channel spring force.

By connecting an orifice plate, the surface of the valve disk facing the fluid channel and acted upon by the pressure medium of the damping medium during operation can be reduced to the size of the disk breakthrough, resulting in a linear characteristic curve in the higher velocity range (for example> 0.13 m / s).

In order to achieve a linear characteristic curve at a lower speed range (for example <0.13 m / s), it is proposed according to the invention additionally to use a pretensioning device which is positioned within the valve disk arrangement and increases the spring force acting in the direction of the fluid channel.

Of course, the above-mentioned limit of 0.13 m / s can not be regarded as a definite size for the present invention, but this only serves to explain and clarify the operation. By the choice of the size, as well as the number of throttle disk breakthroughs, as well as by the design of the biasing device, this speed limit can be changed depending on the requirement.

On the one hand, the combination according to the invention makes it possible to limit the flow of damping medium to the defined quantity, as well as likewise defined prestressing of the valve disks, as a result of which the pitch of the valve disk is increased Dämpfkraftverlaufs both in the higher speed range, as well as in the low speed range can be set differently.

Further advantageous embodiments are specified in the dependent claims, as well as in the figures and the associated description.

According to an advantageous embodiment, the pretensioning device comprises at least a first disk component and a second disk component, wherein the first disk component has a smaller axial extent than the second disk component. By selecting the axial extent of the individual disc components, the bias of the valve disc can be adjusted in a simple manner.

It can be advantageously provided that in the mounted state of the Dämpfventilanordnung the disc components are arranged coaxially to each other, wherein the first disc member is radially centered, mounted and surrounds the carrier directly in the circumferential direction and wherein the second disc member enclosing an annular gap surrounding the first disc member radially , This can be realized in a simple manner, a biasing device which uses the elasticity of the valve discs to increase the spring force acting in the direction of the fluid channel in addition.

in that the second disk component comprises a plurality of guide elements distributed radially outwards and distributed on the outer circumference. When installed, the first disc component can thus be centered on the piston rod pin and the second disc component can be aligned coaxially in the so-called piston skirt. Piston skirt is understood to mean an axially protruding cylindrical extension of the piston body.

• 1: eine bekannte Dämpfventilanordnung gemäß den Stand der Technik;
• 2: eine mögliche Ausführungsvariante einer Dämpfventilanordnung gemäß Patentanspruch 1;
• 3: eine mögliche Ausführungsvariante eines zweiten Scheibenbauteils;
• 4: eine mögliche Ausführungsvariante einer Vorspanneinrichtung;
• 5: eine mögliche Ausführungsvariante einer Drosselscheibe.

According to the following figures, the invention will now be explained in more detail. Show it:

• 1 a known damper valve arrangement according to the prior art;
• 2 a possible embodiment of a Dämpfventilanordnung according to claim 1;
• 3 a possible embodiment of a second disc component;
• 4 a possible embodiment of a pretensioner;
• 5 : a possible embodiment of a throttle disk.

The 1 shows a known from the prior art Dämpfventilanordnung 1 for a vehicle vibration damper. This includes a carrier 11 in the form of a piston rod, this to form a contact shoulder 21 in a piston rod pin 20 passes. On the piston rod pin 20 of the carrier 11 is a damper piston 15 arranged, this one of several on the piston rod pin 20 threaded components is assembled, which by means of a threaded fastener formed as a fastener 22 axially against each other, as well as against the contact shoulder 21 of the carrier 11 are tense.

In addition, the damper valve assembly includes 1 a piston body 2 with several fluid channels 3 , which of valve disc assembly 4 are covered axially. The valve disc assembly 4 includes several, but at least 2 valve discs 16 , which are coaxial with each other on the piston rod pin 20 of the carrier 11 are arranged. The valve disc assembly 4 is placed so that these due to the axial tension one in the direction of the fluid channel 3 acting spring force F1 on the piston body 2 exercises. This spring force F1 provides a resistance to a in the operation of the motor vehicle vibration damper, the fluid channel 3 Passing damping medium, whereby the damping effect of the motor vehicle vibration damper is generated.

The 2 shows an example of an embodiment of a damping valve arrangement according to the invention 1 , Unlike the in 1 shown Dämpfventilanordnung 1 , This additionally includes a throttle plate 5 and a pretensioner 8th ,
The throttle disc 5 is between the piston body 2 and the valve disc assembly 4 attached and has at least one throttle disc breakthrough 6 on which the fluid channel 3 with the to the fluid channel 3 facing surface 7 the valve disc assembly 4 combines. By the number of throttle disk breakthroughs 6 and / or by the choice of the size of the individual throttle disk breakthroughs 6 a flow rate of the damping medium, as well as the desired Dämpfkraftkennlinie can be adjusted. A possible embodiment of the throttle plate is in the 5 shown.

Furthermore, the damping valve arrangement comprises 1 a pretensioner 8th which within the valve disc assembly 4 , For example, can be positioned between the valve discs and is designed such that these in the direction of the fluid channel 3 acting spring force F1 elevated.

In the in 2 and in 4 illustrated embodiments provide that the biasing device 8th a first disc component 9 and a coaxial with the first disc member 9 arranged second disc component 10 includes. As in 2 shown, the first disc component 9 a smaller axial extent h1 on, as the axial extent h2 of the second disc component 10 ,

The first disc component 9 becomes directly on the piston rod pin 20 of the carrier 11 attached and embraces the wearer 20 in the circumferential direction. The second disc component 10 is coaxial with the first disc component 9 arranged and surrounds the first disc component 10 in the circumferential direction, wherein between the first disc component 9 and the second disk component 10 an annular gap 12 through the two disc components 9 . 10 is radially limited.

The second disc component 10 has a plurality on its outer peripheral surface 13 distributed, radially outwardly projecting guide elements 14 on which of the centering of the second disc component 10 inside the piston body 2 and serve its axial guidance.

The valve discs 16 are supported with their outer edge portion on the second disc component 10 , and with its towards the center facing portion on the first disc member 9 axially. Due to the difference in axial extent h1 . h2 the two disc components 9 . 10 become the valve discs 16 elastically deformed, causing the in the direction of the fluid channel 3 acting spring force F1 is increased. By choosing the axial extent h1 . h2 the disc components 9 . 10 can the bias of the valve discs 16 and thus also the increase in the direction of the fluid channel 3 acting spring force F1 be set.

LIST OF REFERENCE NUMBERS

1

Dämpfventilanordnung

2

piston body

3

fluid channel

4

Valve disc assembly

5

throttle disc

6

Throttle disk breakthrough

7

surface

8th

biasing means

9

first disk component

10

second disc component

11

carrier

12

annular gap

13

outer peripheral surface

14

guide element

15

damper piston

16

valve disc

17

damper cylinder

18

Carrier breakthrough

19

Carrier breakthrough

20

Piston rod pin

21

shoulder portion

22

fastener

F1

spring force

h1

axial extent of the first disc component

h2

axial extent of the second disc component

L

longitudinal axis

Claims (5)

Damping valve arrangement (1) for a motor vehicle vibration damper, comprising a damper piston (15) arranged on a support (11; 20) and axially braced against each other, the components comprising: - a piston body (2) having at least one fluid duct (3) and at least one valve disk arrangement (4) comprising at least two valve disks (16) which axially covers the fluid channel (3), the valve disk arrangement (4) acting on the piston body (F1) acting in the direction of the fluid channel (3). 2), characterized in that the damping valve assembly (1) further comprises a throttle plate (5) which is mounted between the piston body (2) and the valve disc assembly (4) and at least one throttle disc aperture (6), which the fluid channel (3 ) with the fluid channel (3) facing surface (7) of the valve disc assembly (4) connects and that the Dämpfventilanordnung (1) further comprising biasing means (8) positioned within the valve disc assembly (4) and increasing the spring force (F1) acting in the direction of the fluid passage (3). Dämpfventilanordnung (1) according to Claim 1 characterized in that the biasing means (8) comprises at least a first disc member (9) and a second disc member (10), the first disc member (9) having a smaller axial extent (h1) than the axial extent (h2) of the second Disc component (10). Dämpfventilanordnung (1) according to Claim 2 , characterized in that in the mounted state of the Dämpfventilanordnung (1) the Disc components (9, 10) are arranged coaxially with each other, wherein the first disc member (9) is radially centered, and the carrier (20) engages directly in the circumferential direction and wherein the second disc member (10) including an annular gap (12) the first Disc component (9) surrounds in the circumferential direction. Dämpfventilanordnung (1) according to Claim 2 , characterized in that the second disc component (10) comprises a plurality of its outer peripheral surface (13) distributed, radially outwardly projecting guide elements (14). Motor vehicle vibration damper with a Dämpfventilanordnung (1), characterized in that the Dämpfventilanordnung (1) is designed according to at least one of the preceding claims.

Images