阅读说明：本技术 用于机动车减振器的阻尼阀组件以及机动车 (damping valve assembly for a motor vehicle shock absorber and motor vehicle ) 是由 R·维特斯塔特 R·莫勒 T·舒伯特 T·艾兴米勒 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阻尼阀组件,其包括具有至少一个流体通道的活塞体,所述流体通道由至少一个阀盘组件覆盖,其中所述阀盘组件将在流体通道的方向上作用的弹簧力施加到活塞体上。所述阻尼阀组件的特征在于,阻尼阀组件此外包括节流盘,所述节流盘安装在活塞体和阀盘组件之间并且具有至少一个缺口,所述缺口使流体通道与阀盘组件的朝向流体通道的表面相连接,并且阻尼阀组件此外具有预紧装置,所述预紧装置定位在阀盘组件之内并且附加地使阀盘组件在流体通道的方向上轴向地预紧。此外,本发明提出一种机动车减振器,其包括根据本发明构造的阻尼阀组件。(The invention relates to a damping valve assembly for a shock absorber of a motor vehicle, comprising a piston body with at least one fluid passage, which is covered by at least one valve disk assembly, wherein the valve disk assembly exerts a spring force acting in the direction of the fluid passage onto the piston body. The damping valve assembly is characterized in that the damping valve assembly furthermore comprises a throttle disk which is mounted between the piston body and the valve disk assembly and has at least one recess which connects the fluid channel to the surface of the valve disk assembly facing the fluid channel, and in that the damping valve assembly furthermore has a prestressing device which is positioned within the valve disk assembly and additionally axially pretensions the valve disk assembly in the direction of the fluid channel. Furthermore, the invention proposes a motor vehicle shock absorber comprising a damping valve assembly constructed according to the invention.)

1. A damper valve assembly (1) for a shock absorber of a motor vehicle, having a damping piston (15) consisting of a plurality of components arranged on a support (11; 20) and axially tensioned to one another, wherein the components comprise:

-a piston body (2) having at least one fluid channel (3); and

-at least one valve disc assembly (4) comprising at least two valve discs (16) axially covering the fluid passages (3), wherein the valve disc assembly (4) exerts a spring force (F1) acting in the direction of the fluid passages (3) onto the piston body (2),

Characterized in that the damping valve assembly (1) furthermore comprises a throttle disk (5) which is mounted between the piston body (2) and the valve disk assembly (4) and has at least one throttle disk recess (6) which connects the fluid duct (3) to a surface (7) of the valve disk assembly (4) facing the fluid duct (3), and in that the damping valve assembly (1) furthermore has a prestressing device (8) which is positioned within the valve disk assembly (4) and which increases a spring force (F1) acting in the direction of the fluid duct (3).

2. A damper valve assembly (1) according to claim 1, wherein the pretensioning device (8) comprises at least a first disc member (9) and a second disc member (10), wherein the first disc member (9) has a smaller axial extension (h1) than the axial extension (h2) of the second disc member (10).

3. A damper valve assembly (1) according to claim 2, characterized in that the disc members (9, 10) are arranged coaxially to each other in the assembled state of the damper valve assembly (1), wherein the first disc member (9) is mounted radially centrally and directly circumferentially surrounds the seat (20), and wherein the second disc member (10) circumferentially surrounds the first disc member (9) affecting the annular gap (12).

4. A damper valve assembly (1) according to claim 2, characterized in that the second disc member (10) comprises a plurality of radially outwardly projecting guide elements (14) distributed over its outer circumferential surface (13).

5. A shock absorber for a motor vehicle having a damping valve assembly (1), characterized in that the damping valve assembly (1) is constructed in accordance with at least one of the preceding claims.

Technical Field

The present invention relates to a damper valve assembly for a shock absorber of a motor vehicle according to the preamble of claim 1 and a shock absorber of a motor vehicle having a damper valve assembly according to the present invention.

Background

Damper valve assemblies for motor vehicle shock absorbers of this type are widely used in the motor vehicle industry. The damping valve assembly generally comprises a damping piston which is composed of a plurality of components arranged on a support and tensioned axially to one another. These components comprise at least one piston body with at least one fluid passage and a valve disk assembly comprising at least two valve disks axially covering the fluid passage. In this case, the valve disk assembly exerts a spring force acting in the direction of the fluid passage on the piston body.

The damping valve assembly mostly has either an increasing damping characteristic or a 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.

In the case of incremental damping valve assemblies, motor vehicle shock absorbers are initially very responsive and can absorb little shock, the greater the piston rod extends into the shock tube, the greater the damping force increases.

In contrast, in a damping valve assembly of decreasing design, the force required to compress the shock absorber, and thus the damping effect, is initially highest and decreases with increasing stroke of the piston rod.

Both of the above-described embodiments have the disadvantage that the stroke available for the piston rod cannot be fully, i.e. effectively, utilized.

A linearly tuned damping valve assembly is most suitable in terms of stroke utilization as efficient as possible. The damper valve assembly makes particularly efficient use of the available stroke. In a linearly tuned damping valve assembly, the force required to compress the shock absorber is equally large for each portion of the stroke.

However, the progressively designed damping valve assemblies are most widely used and are most economical due to their large number.

Disclosure of Invention

The object of the present invention is therefore to further develop a damping valve assembly which in principle has a decreasing characteristic curve, so that a linear characteristic curve can also be achieved thereby.

According to the invention, this object is achieved in that the damping valve assembly comprises a throttle disk which is mounted between the piston body and the valve disk assembly and has at least one throttle disk recess which connects the fluid channel to the surface of the valve disk assembly facing the fluid channel, and in that the damping valve assembly furthermore has a prestressing device which is positioned within the valve disk assembly and increases the spring force acting in the direction of the fluid channel.

By the upstream connection of the throttle disk, the surface of the valve disk facing the fluid passage and acted upon by the pressure of the damping medium during operation can be reduced to the size of the throttle disk gap, as a result of which a linear characteristic curve is obtained in a higher speed range (for example > 0.13 m/s).

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

it is clear that the limit of 0.13m/s given above should not be regarded as a fixedly defined size for the present invention, but merely serve to explain and illustrate the working principle. By selecting the size and number of the throttle disk notches and by designing the pretensioning device, the speed limit can be changed as desired.

The combination according to the invention makes it possible on the one hand to limit the damping medium flow to a defined amount and likewise to achieve a defined pretensioning of the valve disks, as a result of which the slope of the damping force curve can be adjusted differently not only in the higher speed range but also in the lower speed range.

Further advantageous embodiments are given in the dependent claims and in the figures and the description of the figures.

According to an advantageous embodiment, the pretensioning device comprises at least a first disk member and a second disk member, wherein the first disk member has a smaller axial extension than the second disk member. The pretensioning of the valve disks can be set in a simple manner by selecting the axial extension of the individual disk members.

In an advantageous manner, it can be provided that, in the assembled state of the damper valve assembly, the disk members are arranged coaxially to one another, wherein the first disk member is mounted radially centrally and directly surrounds the bearing in the circumferential direction, and wherein the second disk member radially surrounds the first disk member with the influence of the annular gap. In this way, a pretensioning device can be realized in a simple manner, which uses the elasticity of the valve disk in order to additionally increase the spring force acting in the direction of the fluid channel.

The second disc member comprises a plurality of radially outwardly projecting guide elements distributed over the outer circumference. In the mounted state, the first disk member is thereby centered on the piston rod pin, and the second disk member is coaxially aligned in a so-called piston skirt (kolbenhem). The piston skirt is understood to be an axially projecting cylindrical extension of the piston body.

Drawings

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

FIG. 1 illustrates a damper valve assembly known in the art;

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

Fig. 3 shows a possible embodiment variant of the second disk member;

Fig. 4 shows a possible embodiment variant of the pretensioning device;

Fig. 5 shows a possible embodiment variant of the throttle disk.

Detailed Description

Fig. 1 shows a damper valve assembly 1 for a shock absorber of a motor vehicle, which is known from the prior art. The damping valve assembly 1 comprises a support 11 in the form of a piston rod, wherein the piston rod merges into a piston rod pin 20 with the formation of a bearing shoulder 21. A damping piston 15 is arranged on a piston rod pin 20 of the support 11, wherein the damping piston consists of a plurality of components which are threaded onto the piston rod pin 20 and are tensioned axially to one another and to a support shoulder 21 of the support 11 by means of a fastening element 22 in the form of a nut.

Furthermore, the damping valve assembly 1 comprises a piston body 2 with a plurality of fluid passages 3, which are axially covered by a valve disc assembly 4. The valve disk assembly 4 comprises a plurality of, however at least two, valve disks 16 which are arranged coaxially to one another on a piston rod pin 20 of the support 11. The valve disc assembly 4 is arranged: which due to the axial tensioning exerts a spring force F1 acting in the direction of the fluid passage 3 on the piston body 2. The spring force F1 represents the resistance to the damping medium which passes through the fluid channel 3 when the motor vehicle shock absorber is in operation, as a result of which the damping action of the motor vehicle shock absorber takes place.

Fig. 2 shows, for example, an embodiment variant of a damping valve assembly 1 according to the invention. In contrast to the damping valve assembly 1 shown in fig. 1, it additionally comprises a throttle disk 5 and a prestressing device 8.

The throttle disk 5 is mounted between the piston body 2 and the valve disk assembly 4 and has at least one throttle disk recess 6, which throttle disk recess 6 connects the fluid channel 3 to a surface 7 of the valve disk assembly 4 facing the fluid channel 3. By means of the number of throttle disk gaps 6 and/or by selecting the size of the individual throttle disk gaps 6, the flow rate of the damping medium and the desired damping force characteristic can be set. Fig. 5 shows a possible embodiment variant of the throttle disk.

Furthermore, the damper valve assembly 1 comprises a pretensioning device 8 which can be positioned within the valve disk assembly 4, for example between the valve disks, and which is configured to: the pretensioning device increases the spring force F1 acting in the direction of the fluid channel 3.

In the embodiment variant shown in fig. 2 and 4, it is provided that the prestressing device 8 comprises a first disk member 9 and a second disk member 10 arranged coaxially with respect to the first disk member 9. As shown in fig. 2, the first disc member 9 has a smaller axial extension h1 than the axial extension h2 of the second disc member 10.

The first disc member 9 is directly mounted on the piston rod pin 20 of the support 11 and circumferentially surrounds the support 11. The second disc member 10 is arranged coaxially with the first disc member 9 and circumferentially surrounds the first disc member 9, wherein an annular gap 12 is radially defined between the first disc member 9 and the second disc member 10 by the two disc members 9, 10.

the second disk component 10 has a plurality of radially outwardly projecting guide elements 14 distributed over its outer circumferential surface 13, which serve for centering and axial guidance of the second disk component 10 in the piston body 2.

The valve disk 16 is axially supported with its outer edge section on the second disk member 10 and with its section facing the center on the first disk member 9. Due to the difference in the axial extension h1, h2 of the two disc members 9, 10, the valve disc 16 is elastically deformed, whereby the spring force F1 acting in the direction of the fluid passage 3 is increased. By selecting the axial extension h1, h2 of the disk members 9, 10, the pretension of the valve disk 16 and thus also the increase in the spring force F1 acting in the direction of the fluid passage 3 can be adjusted.

List of reference numerals:

1 damping valve assembly

2 piston body

3 fluid channel

4 valve disc assembly

5 throttle disc

6 throttle disc notch

7 surface of

8 preloading device

9 first disk member

10 second disc member

11 support

12 annular gap

13 outer circumferential surface

14 guide element

15 damping piston

16 valve disk

17 damping cylinder

18 seat gap

19 seat gap

20 piston rod pin

21 shoulder section

22 fastener

F1 spring force

h1 axial elongation of first disk member

Axial elongation of h2 second disk member

L longitudinal axis