WO2011060863A1

WO2011060863A1 - Damper valve

Info

Publication number: WO2011060863A1
Application number: PCT/EP2010/006347
Authority: WO
Inventors: Florian Eidinger
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2009-11-20
Filing date: 2010-10-18
Publication date: 2011-05-26
Also published as: DE102009054121A1

Abstract

The invention relates to a damper valve (10) comprising a main body (11) having a flow channel assembly (14) and a control edge (19), a valve disc assembly (16), which, when seated against the control edge (19), covers the flow channel assembly (14), and a fastening member (13), which is fixed relative to the main body (11) and biases the valve disc assembly (16) with respect to the control edge (19) of the main body (11). On an end face (23) facing toward the valve disc assembly (16), the fastening member (13) comprises one or more local elevations (24) in the circumferential direction, and rests only with said elevations against the valve disc assembly (16), such that in the circumferential direction the valve disc assembly (16) is supported only partially by the fastening member (13). In such a way, it is possible to adjust the damping forces on a vibration damper in a defined manner over a large range. Because of the reduced clamping rigidity of the valve disc assembly (16), a large rigidity range can be covered with the damper valve (10). The damper valve (10) additionally has a simple design and can be mounted accordingly easily.

Description

description

damper valve

The invention relates to a damper valve, comprising a base body with a Durchströmkanalanordnung and a control edge, a valve disc assembly which covers the Durchströmkanalanordnung when abutting against the control edge, and a

Fastening member which is fixed relative to the main body and the

Valve disk assembly biases against the control edge of the body. The

Damper valve, for example, as a piston valve or bottom valve in one

Vibration dampers are used.

Such a damper valve is known for example from DE 43 02 624 C1. The

Valve disc assembly is clamped here centrally by means of a nut against the main body. Due to the immediate clamping of the valve disc assembly between the nut and the body, a soft opening behavior of the valve can not be realized. The pressure drop when flowing through the valve is relatively large.

As a result, therefore, complicated spring mechanisms have been proposed to improve the opening performance and to obtain a softer damper characteristic.

Examples of this can be found inter alia in DE 100 28 114 C2, DE 10 2006 061 405 A1 and EP 1 363 043 B1, where in each case an additional spring is provided with a valve disk in order to support a radially inner section of the valve disk arrangement.

In DE 100 28 114 C2, the bias of the valve disc assembly takes place with a plate spring, which is incorporated between a valve plate and a fastening member. With the diaphragm spring can be achieved with a small footprint, although a relatively high spring force. However, disc springs have a large dispersion of the spring characteristic, which is disadvantageous for a precise adjustment of the biasing force of the closure device and thus for the production of similar vibration dampers in mass production. In EP 1 363 043 B1, a helical spring is used for pretensioning the valve disk, which permits a more precise setting of the pretensioning force compared to a diaphragm spring due to its larger axial length, but requires significantly more installation space. The spring characteristic of coil springs can be affected by torsion. In order to avoid this, EP 1 363 043 B1 proposes a torsion-force-free pretensioning of the helical spring. Furthermore, there is a problem with coil springs that their

Spring characteristic depends on the mounting direction of the spring, so that care must be taken during assembly to the correct installation position to ensure a low dispersion of the damper characteristic. Even with the correct installation position it comes with the use of a coil spring due to the design to an oblique force application, since the coil spring can rest over a maximum of 270 ° on the valve disc. Due to the tilted force action line of the coil spring, the opening behavior of the valve is impaired.

All known damper valves, which have a softer characteristic than that of the

DE 43 02 624 C1 identify known valve, have a complicated structure and are therefore complex.

Against this background, the invention has the object to provide a robust, simple and cost-effective damper valve, with which the ^' damping forces can be set defined over a wide range on a vibration damper and the pressure drop when flowing through the valve remains low.

This object is achieved by a damper valve according to claim 1s. The

Valve according to the invention comprises a base body with a Durchströmkanalanordnung and a control edge, a valve disc assembly which covers the flow passage arrangement against the control edge, and a fastening member which relative to the

Main body is fixed and biases the valve disk assembly against the control edge of the body. It is characterized in that the attachment member has one or more local elevations in the circumferential direction at an end face facing the valve disk arrangement and bears against the valve disk arrangement only with these, so that the valve disk arrangement only partially extends in the circumferential direction

Supporting device is supported.

In comparison to the DE 100 28 114 C2, DE 10 2006 061 405 A1 and the

EP 1 363 043 B1 known damper valves, the valve according to the invention is characterized by a considerably simpler structure. The number of required components is lower. moreover can the valve of the invention very easy to assemble and adjust, as the

Fixing member can be screwed to block, that is, the adjustments required in the publications mentioned above can be omitted.

Due to the only partial support of the valve disc assembly on the attachment member resulting in comparison to the known from DE 43 02 624 C1 damper valve changed clamping conditions, namely a clamping with lower rigidity.

As a result, the pressure drop as it flows through the valve is lower, since due to the softer clamping lower pressure differences are required to cause an opening or a desired deformation of the valve disc assembly. When using a similar valve disc assembly thus results for the invention

Damper valve a softer characteristic.

Another advantage of the solution according to the invention is that the rigidity of the valve disk arrangement or the valve disks used for this purpose can be reduced. Thus, with similar valve discs lower stiffness and thus a greater stiffness range cover down, since the disc thickness due to the

Fatigue strength of the discs can not be reduced arbitrarily.

When used in the bypass of a switchable vibration damper can be the

Increase the spread of the force-speed line.

Advantageous embodiments of the invention are specified in further claims.

As a rule, the valve disk arrangement has a central passage opening, via which the valve disk arrangement is pushed onto the base body or a piston rod. In an advantageous embodiment of the invention, the local survey or the local elevations of the fastening member support the valve disc assembly in one of the

Through opening radially adjacent portion from. This is the location of the

Clamping the valve disc assembly radially far inside. This favors a low clamping rigidity and thus a soft characteristic.

According to a further advantageous embodiment of the invention, the local survey or the local surveys each form an inclined contact surface. In this case, central portions of the front side of the fastening member jump axially further than radially outer portions. This also contributes to a low clamping rigidity. Preferably, the fastening member is designed as a threaded nut which is bolted, for example, with the main body or an end portion of a piston rod. The local survey or elevations are formed in this case at one end face of the threaded nut, so that no additional components are required to effect local support. This is particularly advantageous for the assembly.

However, it is also possible to form the local collection or elevations of the fastening member by an intermediate ring which is inserted between the valve disc assembly and a nut. In this case, a standardized component can be used for the nut.

According to a further advantageous embodiment of the invention is the

Valve disk arrangement at a radially inner edge portion in a first

Direction to the body and in the opposite direction to the

Attachment, so that the valve disc assembly directly between the

Main body and the fastening member is clamped. This results in a particularly simple construction of the damper valve.

Preferably, the valve disc assembly is biased with a radially outer edge portion in a dormant state against the control edge of the body and lifts when it flows through a flow medium at a preset pressure level of the control edge.

According to a further advantageous embodiment, the fastening member is on a

Attached end portion of a piston rod, which extends through the main body. As a result, at the same time the base body on the piston rod and the valve disk assembly are fixed to the body with the fixing member. This allows a particularly quick and easy installation.

The clamping behavior of the valve arrangement can also be influenced by measures on the side of the main body. According to an advantageous embodiment of the invention is between an inner edge portion of the valve disc assembly and the

Body arranged an intermediate ring, which forms one or more local elevations in the circumferential direction, so that the valve disc assembly is supported only partially on the side of the body in the circumferential direction. Furthermore, it is possible to form corresponding elevations directly on the base body, for example by the valve disc assembly is supported with an inner edge portion of a formed on the base paragraph, which is interrupted in the circumferential direction. This also makes it possible to achieve only a partial, soft clamping in the circumferential direction.

In principle, it is possible to combine the abovementioned measures on the fastening element and on the base body. However, in the circumferential direction only partial support of the valve disc assembly can be made alone on the side of the body.

In the following the invention will be described with reference to the drawing

Embodiments and various modifications explained in more detail. The drawing shows in:

Figure 1 is a sectional view of a damper valve according to an embodiment of the

Invention in the installed state on a vibration damper,

Figure 2 is a detail view of the clamping of the valve disc assembly of

Damper valve of Figure 1,

FIG. 3 shows an exploded view of the damper valve according to FIG. 1,

FIG. 4 shows a three-dimensional view of the fastening element of the damper valve according to FIG. 1

FIG. 5 shows a first modification of the fastening element,

FIG. 6 shows a second modification of the fastening element,

7 shows a third modification of the fastening element, FIG. 8 shows a fourth modification of the fastening element, FIG. 9 shows a fifth modification of the fastening element,

FIG. 10 shows a sixth modification of the fastening element, Figure 11 shows a seventh modification of the fastening member, and in

Figure 12 is a damper valve according to a second embodiment of the invention.

The first embodiment shown in Figures 1 to 4 relates to a vibration damper 1 for a motor vehicle or motorcycle. The vibration damper 1 comprises, inter alia, a container tube 2 into which a piston rod 3 dips. On the piston rod 3, a piston 5 is fixed, which divides the interior of the container tube 2 into two chambers 5a and 5b. In the piston 5, a damper valve 10 is integrated. The chambers 5a and 5b can communicate with each other via the damper valve 10.

The damper valve 10 includes a base body 11 which is fixed to an end portion 6 of the piston rod 3. For this purpose, a contact shoulder 7 is formed on the piston rod 3, against which the base body 11 is supported. The main body 11 of

Damper valve 10 has a central passage opening 12, through which the preferably formed as a pin end portion 6 of the piston rod 3 extends therethrough. The determination of the main body 11 on the piston rod 3 by means of a

Fastening member 13 which is fixed to a projecting beyond the main body 11 portion at the end of the piston rod 3.

In the illustrated embodiment, the fastening member 13 is formed as a threaded nut which is screwed onto a threaded portion 8 at the end of the piston rod 3. Instead of a threaded connection, for example, a clamping connection between the fastening member 13 and the piston rod 3 may be provided. Furthermore, it is conceivable to press the fastening element 13 with the piston rod 3, to rivet or to weld it to the piston rod 3.

In the main body 11 of the damper valve 10, a flow channel 14 is formed. In the present case, this comprises a plurality of through openings 15 which connect the chambers 5a and 5b when the valve 10 is open.

The damper valve 10 further comprises a valve disc assembly 16 which is clamped with an inner edge portion 17 between the attachment member 13 and the main body 11. For this purpose, the valve disk assembly 16, which forms a central passage opening 25 like the main body 11, after the main body 11 on the end portion. 6 pushed the piston rod 3. In the rest state of the vibration damper 1, an outboard edge portion 18 of the valve disc assembly 16 is supported on a control edge 19 of the main body 11. The control edge 19 surrounds the passage openings 15, so that in a system of the valve disc assembly 16 against the control edge 19 the

Through openings 15 are substantially blocked, that is a communication between the chambers 5 a and 5 b is interrupted. The restraint of

Valve disk assembly 16 is made so that the edge portion 18 is biased slightly against the control edge 19.

As FIGS. 2 and 3 show, the valve disk arrangement 16 is formed by a plurality of flat valve disks 20 and one or more spacers 21. These components are known per se and therefore need not be explained in detail. It should merely be noted that in the illustrated embodiment, at least one valve disc 20 with

Pre-openings 22 is provided to allow a soft response of the damper. The pre-openings 22 connect the two chambers 5a and 5b of the vibration damper 1 with the damper valve 10 closed. The opening cross section provided in this case, however, is very small. If there is a pressure difference on the damper valve 10 as a result of a relative displacement between the piston rod 3 and the container tube 2, then the deform

Valve discs 20 and lift off from the control edge 19, whereby a larger

Opening cross section is provided. About the Voröffnungsquerschnitt and the

Deformability of the valve disk assembly 16 can affect the characteristics of the vibration damper 1.

According to the invention it is proposed to carry out the clamping of the valve disc assembly 16 with less rigidity. This has the advantage that the damper valve 10 already responds or opens at smaller pressure differences, whereby the working range of

Damper valve 10 is increased downward.

In the present case this is due to a circumferential only partial support of

Valve disc assembly 16 achieved by the attachment member 13. In the first

Embodiment has for this purpose the attachment member 13 at its to the

Valve disk assembly 16 facing end face 23 local elevations 24 which bear against the valve disk assembly 16, whereas the end face 23 of the

Valve disc assembly 16 is spaced by a gap. The local elevations 24 are arranged as close as possible to the central passage opening 25 of the valve disk arrangement 16 in the region of the inner edge section 17. In particular, the Elevations 24 may be arranged so that they connect directly to the central passage opening 25 of the valve disc assembly 16. In the present case two local elevations 24 are shown, but only one or more than two, for example three, four, five, six, seven or eight local elevations 24 may be provided.

At the local elevations 24 located contact surfaces 26 to the valve disc assembly 16 may, as shown in Figure 2, be inclined by a small angle α of the valve disc assembly 16 away. The angle α is about 2 to 15 degrees. Central sections of the

Contact surfaces 26 jump from the end face 23 of the fastening member 13 axially further than radially outer portions. As a result, the rigidity of the clamping is further reduced.

During assembly, the base body 11 is first pushed onto the end section 6 of the piston rod 3 until it rests against the shoulder 7. Subsequently, the

Valve disk assembly 16 is pushed onto abutment against the base body 11 on the end portion 6. On the base body 11, an annular shoulder 29 can be formed for this purpose. Afterwards, the base body 11 on the piston rod 3 and furthermore the valve disk arrangement 16 on the base body 11 are fixed by means of the fastening element 13. In the illustrated embodiment, for this purpose, the threaded nut is screwed onto the threaded portion 8 of the piston rod 3, wherein the inner edge portion 17 of the

Valve pulley assembly 16 is clamped to block. The adjustment of the biasing force between valve disc assembly 16 and control edge 19 can be adjusted by the number and thickness of the spacers 21 of the valve disc assembly 16.

From the above-described embodiment, numerous modifications are possible. In particular, the local elevations 24 can also be carried out differently than shown in FIG. 4. Figures 5 to 10 show further embodiments of a

Fastening member 13 with molded elevations 24 '.

Thus, for example, the outer contour of the kidney-shaped elevations 24 in FIG. 4 can be circular-arc-segment-shaped or round, as shown in FIGS. 5 and 8

is shown.

Furthermore, the number of surveys 24 may vary. Thus, for example, three or four circumferentially equidistantly arranged elevations 24 'may be provided, as shown by way of example in Figures 6 and 7. Due to the even distribution in Circumferential direction is ensured a substantially uniform rigidity of the clamping, so that the opening behavior in the region of the control edge 19 in the circumferential direction is also uniform.

In principle, however, a single, circular arc segment-shaped elevation 24 'can be provided, as shown in FIGS. 9 and 10. This results in the region of the control edge 19 an uneven opening behavior, which can be used for a soft, successively growing growing the valve.

11, the fastening member 13 "is formed by an intermediate ring 27 and a nut 28. In this case, the local elevations 24" are formed on the intermediate ring 27, while for the nut 28, for example, a standardized standard component is used. In the installed state, the intermediate ring 27 is disposed between the nut 28 and the valve disk assembly 16, wherein the formed on the intermediate ring 27 elevations 24 "bear against the valve disc assembly 16, the other end face 23" of the intermediate ring 27, however, by a gap of the

Valve disc assembly 16 is spaced. The elevations 24 "can be varied as in FIGS. 5 to 10.

In a further modification of the intermediate ring 27 is not installed between the fastening member 13 "and the valve disc assembly 16, but between the base body 1 1 and the valve disc assembly 16, wherein the elevations 24" against the

Valve disc assembly 16 abut. Furthermore, the valve disk assembly 16 may be clamped on both sides by intermediate rings 27.

According to a second exemplary embodiment, which is illustrated in FIG. 12, local elevations can also be formed by a shoulder 129 of the main body 111 which is interrupted one or more times in the circumferential direction. The valve disk assembly 116 is thereby only partially supported on the side of the main body 111 in the circumferential direction. Incidentally, the second exemplary embodiment largely corresponds to the first exemplary embodiment, so that with respect to the configuration of the piston rod 103 and the valve disk assembly 116, reference is made to this. The fastening member 113 can be executed in this case both without and with local surveys.

The embodiments and modifications explained above make it possible to set the damping forces over a wide range on a vibration damper. Due to the reduced clamping rigidity of the valve disc arrangement, a large range of stiffness can be covered with the damper valve. The damper valve also has a simple structure and can therefore be mounted easily.

The invention has been described above with reference to an embodiment and further

Variations explained in more detail. However, it is not limited thereto, but includes all embodiments defined by the claims.

LIST OF REFERENCE NUMBERS

vibration

container tube

piston rod

piston

a chamber

b chamber

End portion of the piston rod

shoulder

threaded portion

0 damper valve

1 main body

2 central passage opening of the main body

3 fixing element

4 flow channel arrangement

5 passage opening

6 valve disc order

7 internal edge section

8 outboard edge section

9 control edge

0 valve disc

1 spacer

2 pre-opening

3 front side of the fastening element

4 local survey

5 central passage opening of the Ventilscheibenanordnung6 contact surface

7 intermediate ring

8 mother

03 piston rod

11 basic body

13 fixing member Durchströmkanalanordnung

control edge

in the circumferential direction interrupted paragraph

Claims

claims

A damper valve comprising:

a base body (11) having a throughflow arrangement (14) and a control edge (19),

a valve disk assembly (16) which, when abutting against the control edge (19), covers the flow channel arrangement (14), and

a fastening member (13) which is fixed relative to the base body (11) and biases the valve disc assembly (16) against the control edge (19) of the base body (11),

characterized in that

the fastening element (13) has one or more local elevations (24) in the circumferential direction on an end face (23) facing the valve disk arrangement (16) and only abuts against the valve disk arrangement (16) with these, so that the valve disk arrangement (16) extends in the circumferential direction only partially through the

Attachment (13) is supported.

2. damper valve according to claim 1, characterized in that the

Valve disc assembly (16) has a central passage opening (25) and the local survey or local elevations (24) support the valve disc assembly (16) in a to the central passage opening (25) radially adjacent portion.

3. damper valve according to claim 1 or 2, characterized in that the local

Elevation or local elevations (24) each form an inclined contact surface (26), said central portions of the end face (23) of the fastening member (13) protrude axially further than radially outer portions lying.

4. Damper valve according to one of claims 1 to 3, characterized in that the fastening member (13) is a threaded nut and the local collection or

Elevations (24) on an end face (23) of the threaded nut are formed.

5. damper valve according to one of claims 1 to 3, characterized in that the local collection or elevations (24 ") of the fastening member (3") by a Intermediate ring (27) are formed, which is inserted between the valve disc assembly (16) and a fastener such as a nut (28).

6. damper valve according to one of claims 1 to 5, characterized in that

between an inner edge portion (17) of the valve disc assembly (16) and the base body (11) an intermediate ring is arranged, which forms one or more local elevations in the circumferential direction, so that the valve disc assembly (16) on the side of the main body (11) in the circumferential direction is only partially supported.

7. damper valve according to one of claims 1 to 5, characterized in that the

Valve disk assembly (116) is supported with an inner edge portion on a formed on the base body (111) shoulder (129) which in

Circumferential direction is interrupted, so that the valve disc assembly (116) in

Circumferentially only partially supported by the paragraph (129).

8. damper valve comprising:

a main body (111) with a Durchströmkanalanordnung (114) and a

Control edge (119),

a valve disc assembly (116) which, when abutting against the control edge (119) covering the flow channel arrangement (1 4), and

a fixing member (113) fixed relative to the main body (111) and biasing the valve disc assembly (116) against the control edge (119) of the main body (111),

characterized in that the valve disc assembly (116) having a

inner edge portion is supported on a formed on the base body (111) shoulder (129), which is interrupted in the circumferential direction, or between an inner edge portion of the valve disc assembly (116) and the base body (11) an intermediate ring is arranged, the one or in the circumferential direction forms a plurality of local elevations, so that the valve disc assembly (116) on the side of the main body (111) in the circumferential direction by the shoulder (129) or the intermediate ring is only partially supported.

9. damper valve according to one of claims 1 to 8, characterized in that the

Valve disc assembly (16) on a radially inner edge portion (17) in a first direction on the base body (11) and in the opposite direction to the attachment member (13) and between the base body (11) and the

Fixing member (13) is clamped.

10. damper valve according to one of claims 1 to 9, characterized in that the fastening member (13) at one end portion (6) of a piston rod (3) is fixed, which extends through the base body (11), wherein the fastening member (13) at the same time the main body (11) on the piston rod (3) and the

Valve disc assembly (16) on the base body (11) determines.