阅读说明：本技术 用于机动车减振器的阻尼阀组件 (Damper valve assembly for a shock absorber of a motor vehicle ) 是由 A·塞伯 K·库恩 于 2019-05-30 设计创作，主要内容包括：本发明涉及一种用于机动车减振器的、具有递减的阻尼力特性曲线的阻尼阀组件1,其包括至少一个布置在支座2上的、可轴向地在减振缸3中运动的减振活塞4,其中所述减振活塞包括：活塞体5,所述活塞体具有至少一个流体通道6；以及至少一个阀盘7,所述阀盘轴向地覆盖流体通道6；以及弹性的预紧装置8,所述预紧装置将在活塞体5的方向上作用的弹簧力F1施加到阀盘7上,其特征在于,所述阻尼阀组件1此外包括布置在预紧装置8和阀盘7之间的传递构件9,所述传递构件直接地沿着其朝向流体通道6的接触面10轴向地支撑在阀盘7的背离流体通道6的表面11上并且实施成：所述传递构件将由预紧装置8在活塞体5的方向上作用的弹簧力F1传递到阀盘7上并且将弹簧力均匀地分配到阀盘7上。(The invention relates to a damping valve assembly 1 for a motor vehicle shock absorber having a degressive damping force characteristic, comprising at least one damping piston 4 arranged on a carrier 2 and axially movable in a damping cylinder 3, wherein the damping piston comprises: a piston body 5 having at least one fluid passage 6; and at least one valve disk 7, which axially covers the fluid passage 6; and an elastic pretensioning device 8, which exerts a spring force F1 acting in the direction of the piston body 5 on the valve disk 7, characterized in that the damping valve assembly 1 furthermore comprises a transmission member 9 arranged between the pretensioning device 8 and the valve disk 7, which is axially supported directly along its contact surface 10 facing the fluid passage 6 on the surface 11 of the valve disk 7 facing away from the fluid passage 6 and is embodied in such a way that: the transmission element transmits the spring force F1 acting in the direction of the piston body 5 by the pretensioning device 8 to the valve disk 7 and distributes the spring force uniformly to the valve disk 7.)

1. A damping valve assembly (1) for a shock absorber of a motor vehicle with a decreasing damping force characteristic, comprising at least one damping piston (4) arranged on a carrier (2) and axially movable in a damping cylinder (3), wherein the damping piston comprises:

-a piston body (5) having at least one fluid channel (6); and

-at least one valve disc (7) axially covering the fluid passage (6); and

an elastic pretensioning device (8) which exerts a spring force (F1) acting in the direction of the piston body (5) on the valve disk (7),

characterized in that the damping valve assembly (1) furthermore comprises a transmission member (9) arranged between the pretensioning device (8) and the valve disk (7), which is axially supported directly along its contact surface (10) facing the fluid channel (6) on a surface (11) of the valve disk (7) facing away from the fluid channel (6) and is designed such that: the transmission component transmits a spring force (F1) acting by the pretensioning device (8) in the direction of the piston body (5) to the valve disk (7) and distributes the spring force uniformly to the valve disk (7).

2. A damper valve assembly (1) according to claim 1, wherein the transmission member (9) is a rigid disc.

3. The damper valve assembly (1) according to at least one of claims 1 or 2, characterized in that the transmission member (9) comprises a circumferential axial elevation (13) arranged on a radially outer edge (12) thereof, the elevation (13) circumferentially surrounding the valve disk (7).

4. The damper valve assembly (1) according to at least one of claims 1 or 2, characterized in that the transmission member (9) comprises a radially inwardly extending section (14).

5. Damper valve assembly (1) according to at least one of the preceding claims, characterized in that the transmission member (9) is made of metal.

6. Damping valve assembly (1) according to at least one of the preceding claims, characterized in that the transmission member (9) is made of plastic.

7. A damper valve assembly (1) according to at least one of the preceding claims, characterized in that the disc member (17) is made of metal.

Technical Field

The invention relates to a damping valve assembly for a shock absorber of a motor vehicle with a decreasing damping force characteristic curve according to the preamble of claim 1.

Background

Damper valve assemblies of this type are widely used in the automotive industry. The damping valve assembly generally comprises a damping piston which is composed of a plurality of components which are arranged on a support and are tensioned axially relative to one another. The component comprises at least one piston body with at least one fluid channel and at least one valve disk axially covering the fluid channel. Furthermore, the component usually comprises a prestressing device which exerts a spring force acting in the direction of the piston body on the valve disk.

The damping valve assembly mostly has either an increasing, linear or decreasing damping characteristic.

Motor vehicle shock absorbers are usually arranged between an elastic mass and a non-elastic mass and damp vibrations excited by road irregularities by the piston rod extending into a damping cylinder filled with a damping medium, which leads to a damping medium flow defined by the damping valve assembly. The path taken by the piston rod is referred to herein as the stroke.

A linear damping force characteristic has the advantage that it fully utilizes the available stroke of the damping valve assembly within the damping cylinder. In ideal conditions and with a level road surface, a linearly tuned motor vehicle shock absorber is the primary choice. However, in the case of uneven road surfaces, this does not meet either the comfort or safety requirements.

In the case of incremental damping valve assemblies, motor vehicle shock absorbers are very sensitive to reaction and can absorb little shock, the greater the piston rod protrudes into the damping cylinder, the greater the damping force increases. This form of damping behavior is distinguished by high comfort, since small excitations of the vehicle shock absorber, which are caused by uneven ground, are absorbed by the vehicle shock absorber and are not transmitted to the vehicle body. However, if high safety requirements have to be met, the vehicle wheels are required to be in constant contact with the ground, which is lost for some reason due to the increasing damping characteristics and thus the very soft vehicle shock absorber setting at the beginning.

In the case of a damping valve assembly of decreasing design, the force required for compressing the shock absorber, and therefore the damping effect, is initially the highest and decreases with increasing stroke of the piston rod. Thereby always providing the desired constant contact of the vehicle wheel with respect to the road surface.

However, known damping valve assemblies with a decreasing damping force characteristic have the disadvantage that the valve disk often lifts off from the fluid channel outside the defined damping force characteristic, which leads to an early pressure drop. This is often the case when the damping valve assembly is equipped, as required, with only a few valve disks and/or individual components of the damping valve assembly are tensioned strongly with respect to one another over an average level on a support.

Disclosure of Invention

The object of the invention is therefore to further develop the damping valve assembly in such a way that an early lift of the valve disk and an associated early pressure drop are prevented.

This object is achieved by a damper valve assembly according to the preamble of claim 1. Further advantageous embodiments are given in the dependent claims, the figures and the description of the figures.

Thus, according to the invention, it is provided that the damping valve assembly furthermore comprises a transmission element arranged between the prestressing device and the valve disk, which transmission element is supported directly along its contact surface facing the fluid passage axially on the surface of the valve disk facing away from the fluid passage and is embodied in such a way that: the transmission member transmits the spring force acting in the direction of the piston body by the pretensioning device to the valve disk and distributes the spring force uniformly to the valve disk.

This prevents the normally flexible valve disk from being lifted locally early from the fluid channel.

According to an advantageous embodiment, it is provided that the transmission member is a rigid disk. In this way, the lifting action of the generally flexible valve disk is counteracted in a simple manner.

In addition, it can be provided in an advantageous manner that the transmission member comprises a circumferential axial elevation arranged on its radially outer edge, which elevation surrounds the valve disk in the circumferential direction. The transfer member can thus be simply centered on the outer circumference of the valve disk.

For simple centering of the transmission element on the bearing, according to a further advantageous embodiment, the transmission member comprises a section extending radially inward.

Advantageously, the transmission member can be made of metal or, in order to reduce weight, of plastic.

When using plastic for the transmission component and metal for the disk component, in particular when the plastic has a different coefficient of thermal expansion than the metal used, the pretensioning of the valve disk can be adjusted as required at different temperatures in an advantageous manner.

Drawings

The invention will now be explained in detail on the basis of the following figures. Wherein:

figure 1 shows a first possible embodiment variant of the damping valve assembly according to claim 1;

figure 2 shows another possible embodiment variant of the damping valve assembly according to claim 1;

fig. 3 shows another possible embodiment variant of the damping valve assembly according to claim 1.

Detailed Description

Fig. 1 shows a first embodiment variant of a damping valve assembly 1 according to the invention. The damping valve assembly comprises a damping piston 4, said damping piston 4 being arranged on a support 2 and being embodied such that: is axially movable in the damping cylinder 3 filled at least partially with damping medium with respect to the longitudinal axis L. The damping piston 4 divides the interior of the damping cylinder 3 into a first working chamber 15 on the support side and a second working chamber 16 remote from the support. The damping piston 4 furthermore comprises a piston body 5, the piston body 5 having at least one fluid channel 6 formed therein, the fluid channel 6 connecting a first working chamber 15 to a second working chamber 16.

The fluid passage 6 is axially covered at its outlet side by a valve disc 7 which limits the flow of damping medium between the working chambers 15, 16. The damping valve assembly 1 depicted in fig. 1 furthermore comprises a prestressing device 8 consisting of a plurality of resilient spring plates lying one above the other, which exerts a spring force F1 acting in the direction of the piston body 5 on the valve disk 7. Alternatively, the prestressing device 8 can likewise be designed as a helical spring.

A transmission member 9 is arranged between the pretensioning device 8 and the valve disk 7 of the damping valve assembly 1. The transmission member 9 is supported axially along its contact surface 10 facing the fluid channel 6 on the surface 11 of the valve disk 7 facing away from the fluid channel 6 and is embodied as a substantially rigid disk that is substantially stronger than the valve disk, so that the transmission member 9 can transmit the spring force F1 acting in the direction of the piston body 5 by the prestressing device 8 to the valve disk 7 and distribute it uniformly to the valve disk 7. The transmission member 9 can be made of metal or also of plastic.

Fig. 1 and 2 each show an embodiment, according to which the transfer element 9 comprises a circumferential axial elevation 13, which is formed on a radially outer edge 12 of the transfer element. The elevations surround the valve disk 7 in the circumferential direction and serve to center the transmission member 9 more easily on the valve disk 7.

According to the embodiment variant shown in fig. 2, the damper valve assembly furthermore comprises an additional disk member 17 arranged coaxially on the carrier 2 with respect to the transmission member 9, which is covered by a cover disk 18. The additional disk member 17 has the same axial extent as the transmission member 9, but alternatively a smaller axial extent than the transmission member 9. Thereby, a significantly higher rigidity is achieved than when only the transmission member 9 is used. The damping force characteristic curve of the damping valve assembly 1 is thereby significantly more reduced.

Furthermore, a pretensioning disk 19 is arranged between the cover disk 18 and the pretensioning device 8, the axial extension of which defines the magnitude of the pretensioning force F1.

Fig. 3 shows a further alternative embodiment variant of the damping valve assembly 1 according to the invention. In contrast to the configuration shown in fig. 2, the transfer member 9 comprises a radially inwardly extending section 14. This section serves to at least indirectly center the transmission member 9 on the support 2, which considerably simplifies assembly.

List of reference numerals:

1 damping valve assembly

2 support

3 damping cylinder

4 damping piston

5 piston body

6 fluid channel

7 valve disk

8 preloading device

9 transfer member

10 contact surface

11 surface of

12 edge

13 raised part

14 section(s)

15 first working chamber

16 second working chamber

17 disc member

18 covering disc

19 pre-tightening disc

F1 spring force

L longitudinal axis