Frequency-dependent damping valve arrangement

Patent metadata

Field	Value
Publication number	US-10473180-B2
Application number	US-201615736082-A
Country	US
Kind code	B2
Filing date	May 23, 2016
Priority date	Jun 26, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A damping valve arrangement ( 1 ) for a vibration damper includes a damping piston ( 2 ) with a check valve, which damping piston ( 2 ) divides a cylinder ( 31 ) of the vibration damper into a first working chamber ( 32 ) and a second working chamber ( 33 ), and a control arrangement ( 3 ) with a control pot ( 8 ) and a control piston ( 9 ) which is axially movable therein. A connection channel ( 41 ) connects the first working chamber ( 32 ) to the second working chamber ( 33 ). The connection channel ( 41 ) is arranged such that it is at least partially closed by the control piston ( 9 ) during an axial displacement of the control piston ( 9 ) in direction of the damping piston ( 2 ) and opened again during an axial displacement of the control piston ( 9 ) in direction of the pot base ( 30 ).

First claim

The invention claimed is:

1. A damping valve arrangement for a vibration damper, comprising:
a piston rod;
a cylinder at least partially filled with damping fluid;
an axially displaceable damping piston arranged inside said cylinder and axially fixed to said piston rod, said damping piston comprising at least one flow channel formed in the damping piston and covered by at least one valve disk, said damping piston dividing said cylinder into a first working chamber on the piston rod side and a second working chamber remote of the piston rod;
a control arrangement arranged at said piston rod coaxial to said damping piston and comprising a control pot having a cylindrical pot wall and a disk-shaped pot base arranged at an end of said control pot remote of said damping piston and devoid of any flow passage for the damping medium, said control arrangement further comprising an axially displaceable control piston arranged in said control pot and constructed to axially limit a control space enclosed in said control pot;
said damping valve arrangement further comprising an inlet connection connecting said first working chamber to said control space, and wherein at least one spring arrangement is arranged between said control piston and said damping piston; said spring arrangement configured to load said valve disk axially in the direction of said flow channel and said control piston in the direction of said pot base with a defined spring force; and
said damping valve arrangement further comprising a connection channel connecting said first working chamber to said second working chamber, said connection channel arranged so that the connection channel is at least partially closed by said control piston during an axial displacement of said control piston in the direction of said damping piston and opened during an axial displacement of said control piston in the direction of said pot base.

2. The damping valve arrangement according to claim 1 , wherein said connection channel comprises a flow connection formed at said piston rod.

3. The damping valve arrangement according to claim 2 , additionally comprising a tubular guide bush having an outer surface, said tubular guide bush arranged between said damping piston and said pot base of said control arrangement, wherein said control piston surrounds said guide bush in circumferential direction and slides axially on said outer surface of said guide bush, and said connection channel comprises a recess formed at said guide bush.

4. The damping valve arrangement according to claim 1 , additionally comprising a tubular guide bush having an outer surface, said tubular guide bush arranged between said damping piston and said pot base of said control arrangement, wherein said control piston surrounds said guide bush in circumferential direction and slides axially on said outer surface of said guide bush, and said connection channel comprises a recess formed at said guide bush.

5. The damping valve arrangement according to claim 4 , wherein said recess formed at said guide bush comprises tangential edge portions running at least partially parallel to one another.

6. The damping valve arrangement according to claim 4 , wherein said recess formed at said guide bush comprises tangential edge portions running at least partially obliquely relative to one another.

7. The damping valve arrangement according to claim 1 , wherein said connection channel comprises an opening formed at said control piston.

8. The damping valve arrangement according to claim 1 , wherein said control arrangement comprises an adjusting component which at least partially and at least occasionally covers said connection channel.

9. The damping valve arrangement according to claim 1 , wherein said control arrangement comprises a continuous inner sleeve which penetrates all of the components of said control arrangement and holds said components together through a plastic deformation of an edge area.

10. The damping valve arrangement according to claim 9 , wherein said sleeve comprises at least one transverse bore constructed to form said connection channel and at least partially closed by said control piston during an axial displacement of said control piston in direction of said spring arrangement and opened again during an axial displacement of said control piston in direction of said pot base.

11. The damping valve arrangement according to claim 1 , wherein said control piston comprises a flow channel connecting said control space with said second working chamber.

12. The damping valve arrangement according to claim 11 , wherein said flow channel comprises an outlet choke which has a first choke recess having a relatively larger bore and a second choke recess having a relatively smaller bore.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Förster Andreas

Classifications

• F16F9/512

  Means responsive to load action, {i.e. static load} on the damper or {dynamic} fluid pressure {changes} in the damper, {e.g. due to changes in velocity (F16F9/504, F16F9/516 take precedence; non-automatic damper adjustment from a distance using servo control, the servo pressure being created by the flow of damping fluid F16F9/465; self-pumping fluid springs in vehicle suspensions B60G17/044)} · CPC title

• F16F9/3485 Primary

  characterised by features of supporting elements intended to guide or limit the movement of the annular discs (F16F9/3488 takes precedence) · CPC title

• F16F9/3488 Primary

  characterised by features intended to affect valve bias or pre-stress · CPC title

• F16K15/18

  with actuating mechanism; Combined check valves and actuated valves · CPC title

• F16F9/5126

  Piston, or piston-like valve elements (F16F9/504 takes precedence) · CPC title