DE102012220844B3 - Absorbing valve arrangement for shock absorber of motor car, has through holes isolatable by non-return valves exhibiting different closing bias and comprising different flow surfaces, and absorbing piston arranged at piston rod - Google Patents

Abstract

The arrangement has a cylinder (7) divided into two working chambers that are filled with absorbing liquid. Multiple throttles are connected with one another, and an absorbing piston is arranged at an end of a piston rod. An absorbing valve body (1) comprises through holes (3) that connect an absorbing liquid containing balancing area with one of the working chambers. The through holes are isolatable by non-return valves (2) that exhibit different closing bias, and comprise different flow surfaces. A valve flap (11) is attached at the absorbing valve body. The non-return valves are designed as plate valves.

Description

The invention relates to a damping valve assembly for a shock absorber for a vehicle, comprising a cylinder in which a damping piston is arranged axially displaceable, which divides the cylinder into a first working chamber and a second working chamber, which are filled with a damping fluid and the one or a plurality of throttles are connected or connectable to each other, wherein the damping piston is arranged at one end of a Kobenstange and the piston rod is guided out through the first working chamber sealed out of the cylinder, with the cylinder at its opposite end of the piston rod closing valve body with a through hole , by which a damping chamber containing a damping chamber with the first working chamber is connectable and which can be shut off by a biased check valve in the flow direction from the first working chamber to the expansion chamber.

For example, the DE 31 00 886 A1 a hydraulic vibration damper for a vehicle whose Dämpfventilanordnung has a Dämpfventilkörper with a through hole through which a Dämpfflüssigkeit containing compensation chamber with the first working chamber is connectable and which can be shut off by a biased check valve in the flow direction of the first working chamber to the expansion chamber.

The EP 0 56 006 A2 also discloses a generic Dämpfventilanordnung for a shock absorber having an axially movable piston in a working cylinder, which divides the working cylinder into two working chamber and which has a one end of the working cylinder closing Dämpfventilkörper. In this case, the Dämpfventilkörper a plurality of through holes, which connect an outside of the working cylinder arranged equalization chamber with the inner of the working cylinder. The passage openings can be shut off by a check valve.

Also the DE 39 06 128 A1 discloses a valve for vibration dampers, in particular shock absorbers of motor vehicles, which on at least one side of the piston, which contains at least one flow channel, a valve seat which is acted upon by a valve disc, wherein the valve disc has a deviating from the circular contour and an anti-rotation has opposite the valve seat.

In such a damping valve arrangement, it is known to arrange a plurality of passage openings on a concentric circle concentric to the cylinder evenly distributed in the Dämpfventilkörper, which open into a plane in the first working chamber. By a circular valve disc, which is acted upon by a spring against the Dämpfventilkörper and forms the closing member of a check valve, the through holes can be covered and closed. To bring this check valve at a stroke reversal of the damping piston from a first working chamber magnifying stroke in a first working chamber reducing stroke as quickly as possible from its open position to its closed position high biasing forces of the check valve are required.

At lower preload forces of the check valve it comes to Poltergeräuschen.

The object of the invention is therefore to provide a Dämpfventilanordnung of the aforementioned type, which allows a simple construction, a sensitive opening and closing of the connection of the expansion chamber with the first working chamber and avoids stuttering during the closing movement.

This object is achieved in that the Dämpfventilkörper has a plurality of the expansion chamber with the first working chamber connecting passage openings, wherein at least two of the passage openings can be shut off by a separate check valve.

By arranging a plurality of through holes with independent check valves, the biasing forces of the check valves can be reduced while avoiding a delayed closing behavior and polter noise. Thus, the switching point of the check valves is fast reacting very close to the reversal of motion of the damper piston.

A staggered opening and closing of the check valves is achieved in that the at least two through holes of different closing bias having check valves are shut off and / or have different flow areas.

In a simple embodiment, the preloaded check valves may be plate valves.

For this purpose, one or more of the passage openings open on valve seat planes of the Dämpfventilkörpers in the first working chamber and the mouths of the through holes can be covered by a valve flap, at least approximately powerless pivotally about tangentially adjacent to the through holes extending pivot axes and springs to rest against the valve seat planes of the Dämpfventilkörpers kraftbeaufschlagt and connected with mounting ends in the region of their pivot axes with the Dämpfventilkörper.

In a simple embodiment, on the side facing away from the passage opening of the pivot axis, the valve flap having a fastening portion with which the valve flap is attached to the Dämpfventilkörper.

In order to reduce the component and simplify assembly, a plurality of valve flaps can be connected to one another at their attachment areas to form a component.

The arrangement of a larger number of simply trained check valves is made possible in that on a radially encircling pitch distributed more passage openings in the first working chamber and a corresponding number of valve flaps are connected to a star-shaped valve flap element together.

A space-saving and easy trained bias of the check valves is achieved in that one or more of the valve flaps are each acted upon by a cantilevered spring arm to rest against the valve seat planes of the Dämpfventilkörpers whose one ends are connected in the areas of the mounting ends of the valve flaps with the Dämpfventilkörper.

In cost-effective training, the spring arms can be leaf springs, wherein the spring arms can have a reducing or enlarging width at their free-floating area towards the free end.

Furthermore, the spring arms can be bendable against bending lines against their spring force, which extend at a distance to the connected to the Dämpfventilkörper ends transverse to the longitudinal extension of the spring arms.

To vary the spring forces with otherwise the same structure, the distances of the bending lines may be different to the connected to the damping body ends of the spring arms in the various spring arms.

To reduce component and simplify assembly, a plurality of spring arms may be connected to one another at their ends connected to the Dämpfventilkörper to form a component, in particular one of the number of the valve flaps corresponding number of spring arms are connected to a star-shaped Federarmelement together.

For easy arrangement of the star-shaped spring element on the Dämpfventilkörper the star-shaped Federarmelement held by a support disk on the Dämpfventilkörper in Appendix and the spring arms are supported on the radially encircling edge of the support disk, wherein the radially encircling edge defines the bending lines of the spring arms.

To achieve the same or different bending lines with otherwise identical spring arms, the radially encircling edge may have a circular or deviating from the circular shape.

If the valve seat planes of the damping valve body extend inclined with respect to the longitudinal axis of the cylinder, the passage openings may also be correspondingly inclined. This results in an optimized flow flow in the intake with low deflection.

But it is also possible that the valve seat planes of the Dämpfventilkörpers extend parallel to the longitudinal axis of the cylinder.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it

1 a view of a first embodiment of a Dämpfventilanordnung

2 a section along the line II in 1

3 a section along the line II-II in 1

4 an exploded perspective view of the damping valve according to 1

5 an enlarged section in section along the line II in 1

6 a view of a Dämpfventilkörpers a second Dämpfventilanordnung

7 a section along the line VI-VI in 6

8th a side view of the Dämpfventilkörpers after 6

9 a perspective view of the Dämpfventilkörpers after 6

10 an enlarged section in section along the line VI-VI in 6

11 a view of a Dämpfventilkörpers a third Dämpfventilanordnung

12 a section along the line XI-XI in 10

13 a section along the line XII-XII in 10

14 a perspective view of the Dämpfventilkörpers after 10

15 a rear view of the Dämpfventilkörpers after 10

16 a view of a Federarmelements.

In the figures is a Dämpfventilkörper 1 . 1' . 1'' a damper valve assembly for a shock absorber of a vehicle, the check valves 2 . 2 ' at passage openings 3 . 3 ' 3 '' has, over a compensation chamber side 4 the Dämpfventilkörpers 1 . 1' . 1'' with one side 5 a second working chamber is connectable. The second working chamber is in a cylinder filled with a damping fluid 7 of the shock absorber, which is divided by a damping piston in a first and a second working chamber. At which the two working chambers connecting throttles having damping piston, a piston rod is arranged, which is guided through the first working chamber and sealed to the outside.

In the embodiment of the 1 to 5 has the Dämpfventilkörper 1 on the website 5 the partly also filled with damping fluid compensation chamber a frustoconical recess 6 on, on its circumferential surface evenly distributed multiple valve seat levels 8th has, in each case a passage opening 3 opens, according to the inclination of the associated valve seat plane 8th inclined to the radial circumferential surface 9 the Dämpfventilkörpers 1 that leads to the compensation chamber side 4 communicates.

A star-shaped valve flap element 10 the check valves 2 lies in the closed position with the valve flaps formed by its rays 11 at the valve seat levels 8th on and closes the mouths of the through holes 3 ,

A likewise star-shaped spring arm element 12 , the same amount of blasting as the valve flap element 10 has lies with his spring arms 13 on the valve flaps 11 and holds these the mouths of the passage openings 3 occlusive with preload on the valve seat planes 8th ,

In the ground 14 the frustoconical recess 6 close range are the valve flaps 11 the valve flap element 10 and the spring arms 13 of the spring element 12 through a support disk 15 against the valve seat levels 8th pressed so that they freestanding valve flaps 11 and spring arms 13 are.

The spring arms 13 have a width that reduces towards its free end and have a spacing from the support disk 15 extending transverse to their longitudinal extension bending lines 16 around the the free ends of the spring arms 13 can swing.

If there is an extension stroke of the damping piston and thus to a lower pressure in the second working chamber opposite the compensation chamber side 4 become the freely pivotable valve flaps 11 against the biasing force of the spring arms acting on it 13 from the mouths of the passage openings 3 lifted and damper liquid can from the compensation chamber side 4 flow into the second working chamber.

In the 6 to 10 is a second embodiment of a Dämpfventilkörpers 1 represented in the same manner in a Dämpfventilanordnung for a shock absorber of a vehicle, as the embodiment of the 1 to 5 ,

The damper valve body 1' has a step-like recess 6 ' on, whose small step 17 to the side 5 the second working chamber opens and at its large stage 18 by a not shown, in the big step 18 usable closure disc is closable.

At the radial wall of the small step 17 are evenly distributed around the circumference valve seat planes 8th formed in the radial passage openings 3 ' lead to the compensation chamber side 4 to lead.

The side facing the second working chamber opens into each valve seat plane 8th radially a threaded hole 19 , On the valve seat level 8th lies according to the embodiment of 1 to 5 first a valve flap 11 and on it a spring arm 13 on. These are designed as individual components and not as a valve flap element and Federarmelement.

The valve flaps 11 and spring arms 13 exhibit in their areas outside the passage openings 3 ' drilling 20 on, by the unshown screws are feasible, in the threaded holes 19 screwed and thus the valve flaps 11 and spring arms 13 firmly to the valve seat levels 8th are pressable. According to the embodiment of the 1 to 5 act on the spring arms 13 the freely movable valve flaps 11 with bias against the valve seat planes 8th , so that normally the through holes are closed.

If there is an extension stroke of the damping piston and thus to a lower pressure in the second working chamber opposite the compensation chamber side 4 become the freely pivotable valve flaps 11 against the biasing force of the spring arms acting on it 13 from the mouths of the passage openings 3 ' lifted and damper liquid can from the compensation chamber side 4 flow into the second working chamber.

In the 11 to 15 is a third embodiment of a Dämpfventilkörpers 1'' represented in the same manner in a Dämpfventilanordnung for a shock absorber of a vehicle, as the embodiment of the 1 to 5 ,

The damper valve body 1'' has a plurality of passage openings 3 '' on, which are formed on a concentric circle evenly distributed coaxially extending. The side 5 the second working chamber facing side of the Dämpfventilkörpers 1'' extends radially flat and forms in the mouth areas of the through holes 3 '' valve levels 8th ,

Not shown that at the level of the valve levels 8th a likewise planar star-shaped valve flap element as well as a plane star-shaped spring arm element are in contact, which in its central region by a screw connection with the Dämpfventilkörper 1'' are connected. One way of forming the Federarmelements 12 is in 16 shown in which the spring arms 13 ' have an increasing width at their free-floating area toward the free end.

As in the embodiment of 1 to 5 are the openings of the through holes closing, freely movable valve flaps of the valve element of the spring arms of Federarmelements with bias in abutment with the valve levels 8th held.

If there is an extension stroke of the damping piston and thus to a lower pressure in the second working chamber opposite the compensation chamber side 4 become the freely pivotable valve flaps 11 against the biasing force of the spring arms acting on it 13 from the mouths of the passage openings 3 '' lifted and damper liquid can from the compensation chamber side 4 flow into the second working chamber.

LIST OF REFERENCE NUMBERS

1

Dämpfventilkörper

1'

Dämpfventilkörper

1''

Dämpfventilkörper

2

check valve

2 '

check valve

3

Through openings

3 '

Through openings

3 ''

Through openings

4

Balance chamber side

5

Side second working chamber

6

recess

6 '

recess

7

cylinder

8th

Valve seat planes

9

lateral surface

10

Butterfly valve

11

valve flaps

12

Federarmelement

12 '

Federarmelement

13

spring arms

13 '

spring arms

14

ground

15

support disc

16

bending lines

17

small step

18

big step

19

threaded hole

20

drilling

Claims (17)

Damping valve assembly for a shock absorber for a vehicle, comprising a cylinder in which a damping piston is arranged axially displaceable, which divides the cylinder into a first working chamber and a second working chamber, which are filled with a damping fluid and connected via one or more throttles or can be connected, wherein the damping piston is arranged at one end of a Kobenstange and the piston rod is guided through the second working chamber sealed out of the cylinder, with the cylinder at its opposite end of the piston rod closing valve body with a through-hole through which a Dämpfflüssigkeit containing Compensation space with the first working chamber is connectable and which can be shut off by a biased check valve in the flow direction from the first working chamber to the expansion chamber, wherein the Dämpfventilkörper ( 1 . 1' . 1'' ) a plurality of the expansion chamber with the first working chamber connecting passage openings ( 3 . 3 ' . 3 '' ), characterized in that the at least two passage openings ( 3 . 3 ' . 3 '' ) of different closing bias having check valves ( 2 . 2 ' ) are shut off and / or have different flow areas. Damping valve arrangement according to claim 1, characterized in that the pretensioned check valves ( 2 . 2 ' ) Plate valves are. Damping valve arrangement according to claim 2, characterized in that one or more of the passage openings ( 3 . 3 ' . 3 '' ) at valve seat levels ( 8th ) of the damping valve body ( 1 . 1' . 1'' ) open into the first working chamber and the mouths of the passage openings ( 3 . 3 ' . 3 '' ) from a valve flap ( 11 ) can be covered, at least approximately powerless around tangentially next to the passage openings ( 3 . 3 ' . 3 '' ) pivoting pivot axes and springs to rest against the valve seat planes ( 8th ) of the damping valve body ( 3 . 3 ' . 3 '' ) and with attachment ends in the region of their pivot axes with the Dämpfventilkörper ( 3 . 3 ' . 3 '' ) are connected. Damping valve arrangement according to claim 3, characterized in that on the passage opening ( 3 . 3 ' . 3 ' ) facing away from the pivot axis of the valve flap ( 11 ) has a fastening portion, with which the valve flap ( 11 ) on the damper valve body ( 1 . 1' . 1'' ) is attached. Damping valve arrangement according to claim 4, characterized in that a plurality of valve flaps ( 11 ) are connected to one another at their attachment portions to a component. Damping valve arrangement according to one of claims 4 and 5, characterized in that a plurality of passage openings ( 3 . 3 '' ) open into the first working chamber and a corresponding number of valve flaps ( 11 ) to a star-shaped valve flap element ( 10 ) are interconnected. Damping valve arrangement according to one of claims 3 to 6, characterized in that one or more of the valve flaps ( 11 ) each of a freestanding spring arm ( 13 . 13 ' ) for abutment with the valve seat planes ( 8th ) of the damping valve body ( 3 . 3 ' . 3 '' ) whose one ends in the areas of the mounting portions of the valve flaps ( 11 ) with the damper valve body ( 3 . 3 ' . 3 '' ) are connected. Damping valve arrangement according to claim 7, characterized in that the spring arms ( 13 . 13 ' ) Leaf springs are. Damping valve arrangement according to claim 8, characterized in that the spring arms ( 13 . 13 ' ) have a reducing or enlarging width at their free-bearing area toward the free end. Damping valve arrangement according to one of claims 8 and 9, characterized in that the spring arms ( 13 ) against their spring force around bending lines ( 16 ) are bendable, which at a distance to the with the Dämpfventilkörper ( 1 ) connected ends transversely to the longitudinal extent of the spring arms ( 11 ). Damping valve arrangement according to claim 10, characterized in that the distances of the bending lines ( 16 ) to the with the steaming body ( 1 ) connected ends of the spring arms ( 11 ) at the various spring arms ( 11 ) are different. Damping valve arrangement according to one of claims 7 to 11, characterized in that a plurality of spring arms ( 13 . 13 ' ) at their with the Dämpfventilkörper ( 1 . 1'' ) connected ends to a component. Damping valve arrangement according to claims 6 and 12, characterized in that one of the number of valve flaps ( 11 ) corresponding number of spring arms ( 13 . 13 ' ) to a star-shaped spring arm element ( 12 . 12 ' ) are interconnected. Damping valve arrangement according to claim 13, characterized in that the star-shaped spring arm element ( 12 ) from a support disk ( 15 ) on the damper valve body ( 1 ) is held in abutment and the spring arms ( 13 ) at the radially encircling edge of the support disk ( 15 ) are supported. Damping valve arrangement according to claim 14, characterized in that the radially encircling edge has a circular or a shape deviating from the circular shape. Damping valve arrangement according to Claim 3, characterized in that the valve seat planes ( 8th ) of the damping valve body ( 1 ) relative to the longitudinal axis of the cylinder ( 7 ) extend inclined. Damping valve assembly according to claim 3, characterized in that the valve seat planes of the Dämpfventilkörpers extend parallel to the longitudinal axis of the cylinder.

Images