DE102017216661A1 - Damping arrangement for a vibration damper of a motor vehicle - Google Patents

Abstract

A damping arrangement 1 for a vibration damper 2 of a motor vehicle is proposed, comprising:
- A damping valve. 3
- At least a first, in a valve body 4 of the damping valve 3 running flow channel 5 for a damping fluid, said
is covered by at least one valve disc 6,
- At least one second flow channel 7, which is designed to be functionally parallel to the first flow channel 5.
The invention is characterized in that the damping arrangement 1 is designed such that when the valve disc 6 opens the first flow channel 5, it at least partially closes the second flow channel 7.

Description

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

A vibration damper is usually arranged between a suspension and the bodywork of a motor vehicle and has the task to dampen the shocks coming from the suspension and to mitigate a transmission of these shocks to the body of the motor vehicle at least.

A generic damping arrangement usually comprises a damping piston with a damping valve which has a first flow channel for a damping fluid, which is covered by a spring-loaded valve disc. The damping fluid used is usually a suitable virtually uncompressible damping fluid. The damping valve is adjusted so that when a defined pressure of the damping fluid in the flow passage is exceeded, the valve disc lifts itself from the flow passage and at least partially opens, whereby the damping fluid can flow through the flow passage. Since the valve disk is spring-loaded, it creates a resistance which acts counter to the flow direction of the damping fluid, which produces a damping effect of the vibration damper.

For the opening of the valve disc is only an overcoming of a defined contact pressure of the spring-loaded valve disc at the outlet end of the first flow channel required. Thus, it can not be ruled out that the shocks that are too small to overcome this pressure limit are transmitted to the body, whereby, for example, a ride through the cobblestones would be perceived as rather uncomfortable.

In order to solve this problem, the damping arrangement is usually equipped with at least one so-called bypass. This is at least one additional, additional constant-acting, ie permanently open flow channel, which has a significantly smaller, defined cross-section than the first flow channel. The second flow channel is usually arranged functionally parallel to the first flow channel and is also traversed by a damping fluid. The second flow passage allows the damping fluid to bypass the valve disc of the damping valve for smaller shocks. Thus, the damping arrangement reduces the impact energy without transferring it to the body.

Due to the usually very high working pressures and the flow velocities, occasionally problems with hissing noises, which are audible within the driver's cab and are perceived as unpleasant, occur occasionally in the motor vehicle vibration dampers, especially in the commercial vehicle sector.
These arise, inter alia, that during operation of the vibration damper, in particular in the case of larger rebound and rebound movements, the damping fluid flow flows out of the second flow channel under a very high pressure and encounters further components, such as damper cylinders, resulting in vibrations, which then continue to be transferred to the body.

The object of this invention is therefore to provide an alternative damping arrangement for a vibration damper of a motor vehicle, which overcomes the problems discussed above.

This object is achieved according to the characterizing part of patent claim 1, characterized in that the valve arrangement is designed such that when the valve disc opens the first flow channel, it closes the second flow channel.

This ensures that closed at high working pressure and flow velocity of the damping fluid of the bypass and the leakage of the damping fluid is interrupted, whereby the hissing noise can be significantly minimized.

Further advantageous embodiments are specified in the dependent claims.

According to an advantageous embodiment, it can be provided that the damping arrangement comprises at least one valve component arranged at least indirectly adjacent to the valve disk, which valve arrangement together with the valve disk forms a closure arrangement for closing the second flow channel. This then provides a bearing surface for the valve disc, which bends reversibly in the load state, based on the support surface and closes the second flow channel in a simple manner.

As a very cost effective designed as a resilient disc closure assembly has been found, as it was specified in a further advantageous embodiment. The disk-shaped closure arrangement can be symmetrical or asymmetrical and / or have an outer contour deviating from the round shape. This allows a simple executed defined influencing the Dämpfkraftkennlinie. This then gets a progressive course, as with increasing deflection of the valve disc, the required contact pressure of the valve disc on the valve member to close the second flow channel, also increases.

Highly advantageous, since very cost-effective, the valve member may be designed as a bent sheet metal part or as a stamped part.

According to a further advantageous embodiment, it is provided that the valve component comprises a peripheral edge elevation. By choosing the axial extent of the edge elevation can be adjusted in a simple manner, the axial gap width between the valve disc and the valve member. The edge elevation can be made in one piece with the valve component or in two parts. It can be advantageously provided that the circumferential edge elevation of the valve member is designed as a ring which is inseparably connected to the valve member.

In addition, the valve component can advantageously comprise an inextricably connected to the valve member, arranged radially between the edge elevation and a longitudinal axis of the damping arrangement arranged annular deflection member.

Between the edge elevation and the deflection component, a settling chamber for the outflowing damping fluid is arranged. The deflecting member is irradiated during operation of the vibration damper from the emerging from the second flow passage damping fluid, and then enters the settling chamber, where the pressure of the damping fluid is lowered and its flow is calmed. This will further minimize the hissing noise in a simple manner.

With reference to the following figures, the invention will now be explained in more detail.

• 1: eine Schnittdarstellung eines Abschnitts einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 2 eine Schnittdarstellung einer Dämpfungsanordnung gemäß 1 mit einer ausgelenkten Ventilscheibe;
• 3 eine Schnittdarstellung eines Abschnitts einer weiteren beispielsweisen Ausführungsvariante einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 4 eine Schnittdarstellung eines Abschnitts einer dritten beispielsweisen Ausführungsvariante einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 5 eine Schnittdarstellung eines Abschnitts einer vierten beispielsweisen Ausführungsvariante einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 6 eine Schnittdarstellung eines Abschnitts einer fünften beispielsweisen Ausführungsvariante einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 7 eine Schnittdarstellung eines Abschnitts einer sechsten beispielsweisen Ausführungsvariante einer Dämpfungsanordnung gemäß Patentanspruch 1;
• 8 eine Draufsichtdarstellung einer ersten beispielsweisen Ausführungsvariante eines Ventilbauteils;
• 9 eine Draufsichtdarstellung einer zweiten beispielsweisen Ausführungsvariante eines Ventilbauteils;
• 10 eine Draufsichtdarstellung einer ersten beispielsweisen Ausführungsvariante eines ersten Scheibenelements;
• 11 eine Draufsichtdarstellung einer zweiten beispielsweisen Ausführungsvariante eines ersten Scheibenelements;
• 12 eine Draufsichtdarstellung einer dritten beispielsweisen Ausführungsvariante eines ersten Scheibenelements;
• 13 eine Draufsichtdarstellung einer ersten beispielsweisen Ausführungsvariante eines zweiten Scheibenelements.

Show it:

• 1 a sectional view of a portion of a damping arrangement according to claim 1;
• 2 a sectional view of a damping arrangement according to 1 with a deflected valve disc;
• 3 a sectional view of a portion of another exemplary embodiment of a damping arrangement according to claim 1;
• 4 a sectional view of a portion of a third exemplary embodiment of a damping arrangement according to claim 1;
• 5 a sectional view of a portion of a fourth exemplary embodiment of a damping arrangement according to claim 1;
• 6 a sectional view of a portion of a fifth exemplary embodiment of a damping arrangement according to claim 1;
• 7 a sectional view of a portion of a sixth exemplary embodiment of a damping arrangement according to claim 1;
• 8th a top view of a first exemplary embodiment of a valve member;
• 9 a top view of a second exemplary embodiment of a valve member;
• 10 a top view of a first exemplary embodiment of a first disc element;
• 11 a top view of a second exemplary embodiment of a first disc element;
• twelve a top view of a third exemplary embodiment of a first disc element;
• 13 a top view of a first exemplary embodiment of a second disc element.

The 1 shows a first example embodiment of a vibration damper 2 with a damping arrangement according to the invention 1 , The vibration damper 2 includes one on a piston rod 11 fixed damping piston 13 which is inside a damper cylinder twelve is arranged axially movable and the interior of the damper cylinder twelve in a first workroom 14 and a second workspace 15 divided. The damping piston comprises a damping valve 3 in which this at least one first, in a valve body 4 of the damping valve 3 executed, of at least one valve disc 6 covered flow channel 5 for a damping fluid.

In addition, the damping arrangement includes 1 a second flow channel 7 which is functionally parallel to the first flow channel 5 is executed and axially relative to a longitudinal axis of the damping arrangement along a portion 16 the piston rod 11 extends. The second flow channel 7 is partially as a axially along the piston rod extending recess 17 executed. Alternatively, the second flow channel 7 at least partially as one axially extending groove or bore are made, which either on the piston rod 11 and / or on the damping piston 13 is appropriate.

At least indirectly to the valve disc 6 adjacent is a valve member 8th arranged, which together with the valve disc 6 a closure arrangement 9 which forms the closing of the second flow channel 7 serves.

An end section 21 of the second flow channel 7 flows into an annulus 20 the closure assembly 9 , which axially between the valve disc 6 and the valve member 8th is arranged. In this case, the end section runs 21 of the second flow channel 7 radially through various openings 24 ; 25 which are in between the valve disc 6 and the valve member 8th introduced disc elements 18 ; 19 are executed.

The 2 shows a working state of the damping arrangement 1 which, due to a rebound movement of the vibration damper 2 the damping fluid pressure in the first working space 14 is significantly higher than the damping fluid pressure in the second working space 15 of the vibration damper 2 , The damping fluid in this case flows through the first flow channel 5 in the second workspace 15 , causing the valve disc 6 deformed axially reversible and to the edge elevation 26 of the valve component 8th firmly leans. As a result, the valve slide shown in the figures as a valve disc package closes 6 the second flow channel 7 , whereby the flow of the damping fluid through the second flow channel 7 is interrupted. Thus, the valve disc opens 6 the first flow channel 5 and simultaneously closes the second flow channel 7 ,

As in the 1 and 2 is shown, comprises the valve member 8th a circumferential edge enhancement 26 with a defined height, wherein by choosing the height of the edge elevation 26 the axial extent of the gap between the valve disc 6 and the valve member 8th is set.

Unlike the 1 and 2 show the 3 that the circumferential edge enhancement 26 can be designed as a separate annular member, which with the valve member 8th is inseparable.

The height of the peripheral edge enhancement can be very small, depending on the requirement, or, it may be on the edge elevation, as in the 4 is omitted, completely waived, if necessary.

The 5 shows an embodiment variant, according to which between the valve disc package and the valve member 8th only one disc element 18 is arranged, which at least one radially extending aperture 24 for the damping fluid. The task of the breakthrough 24 is it the damping fluid in the gap 20 to lead. Of course, this object can be achieved in another manner known to the person skilled in the art, for example by means of embossing carried out in or on the disk element, a radial bore or a radially extending groove.

According to the in 6 illustrated embodiment includes the valve member 8th one with the valve component 8th Inseparably connected, radially between the edge elevation 26 and a longitudinal axis L the damping arrangement 1 arranged annular deflection member 10 which serves as an impact element and for deflecting the emerging from the second flow passage damping fluid. In addition, between the edge enhancement 26 and the deflection component 10 a calming chamber 32 attached to calm the outflowing damping fluid.

The valve component 8th can be listed as a resilient disc, which has a circular, symmetrical or asymmetrical, deviating from the round shape outer contour, as for example in the 8th and 9 is shown.

Furthermore, the valve component 8th be executed as a stamped part, or a bent sheet metal part, as in the 7 is shown.

The 10 . 11 and twelve show different possible embodiments of the first disc element 18 which breakthroughs 24 , and in each case a centrally located piston rod breakthrough 28 exhibit. The breakthroughs 24 extend radially along the disk element 18 and may be configured as a groove or trapezoidal. In addition, these can be through channels 30 that with piston rod breakthrough 28 be connected. Of course, the invention may not be limited to the embodiments shown here. Rather, other suitable embodiments are applicable.
Likewise, this statement applies to the in the 13 illustrated example embodiment of the second disc element 19 to.
At the in 13 illustrated embodiment, the second disc element 19 a centrally executed piston rod breakthrough 29 , Between the piston rod breakthrough 29 and the radially outer edge of the disc element 19 is a C-shaped breakthrough 25 arranged in the a radially extending outlet channel 31 for the damping fluid opens.

LIST OF REFERENCE NUMBERS

1

damping arrangement

2

vibration

3

damping valve

4

valve body

5

first flow channel

6

valve disc

7

second flow channel

8th

valve component

9

closure assembly

10

deflection component

11

piston rod

12

damper cylinder

13

damping piston

14

first working space

15

second workspace

16

Section of the piston rod

17

recess

18

first disc element

19

second disc element

20

gap

21

end

22

balancing member

23

attachment member

24

breakthrough

25

breakthrough

26

marginal increase

27

Piston rod breakdown

28

Piston rod breakdown

29

Piston rod breakdown

30

channel

31

outlet channel

32

settling chamber

L

longitudinal axis

Claims (10)

Damping arrangement (1) for a vibration damper (2) of a motor vehicle, comprising: - a damping valve (3) - at least one first, in a valve body (4) of the damping valve (3) running through flow channel (5) for a damping fluid, said - is covered at least one valve disc (6), - at least one second flow channel (7), which is functionally parallel to the first flow channel (5), characterized in that the damping arrangement (1) is designed such that when the valve disc (6 ) opens the first flow channel (5), it at least partially closes the second flow channel (7). Damping arrangement (1) according to Claim 1 , characterized in that the damping arrangement (1) at least one at least indirectly to the valve disc (6) adjacently arranged valve member (8), which together with the valve disc (6) forms a closure assembly (9) for closing the second flow channel (7) , Damping arrangement (1) according to Claim 2 , characterized in that the valve member (8) is designed as a resilient disc. Damping arrangement (1) according to Claim 2 or 3 , characterized in that the valve member (8) has a deviating from the round shape outer contour. Damping arrangement (1) according to at least one of Claims 2 to 4 , characterized in that the valve member (8) comprises a peripheral edge elevation (26). Damping arrangement (1) according to Claim 5 , characterized in that the circumferential Randerhöhung (26) of the valve member is designed as a ring which is inseparably connected to the valve member (8). Damping arrangement (1) according to at least one of Claims 2 to 5 , characterized in that the valve member (8) with the valve member (8) inseparably connected, radially between the edge elevation (26) and a longitudinal axis (L) of the damping assembly (1) arranged annular deflection member (10). Damping arrangement (1) according to at least one of the preceding claims, characterized in that the valve member (8) is designed as a bent sheet metal part or as a stamped part. Vibration damper (2) of a motor vehicle with a damping arrangement (1), comprising a damping piston (13) fixed axially to a piston rod (11) within a damper cylinder (12) with the damping valve (3), wherein the damping piston (13) controls the damping piston (13) Interior of the damper cylinder (12) into a first working space (14) and a second working space (15) divided, characterized in that the damping arrangement (1) is designed according to at least one of the preceding claims. Vibration damper (2) after Claim 8 , characterized in that the second flow channel (7) is at least partially designed as a recess (17) or groove or bore extending axially along a section (16) of the piston rod (11).

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