Frequency-dependent damping valve arrangement

Patent metadata

Field	Value
Publication number	US-10443673-B2
Application number	US-201515315694-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	Jun 5, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A damping valve arrangement for a vibration damper is disclosed. This damping valve arrangement includes a damping piston with a check valve and a control arrangement with a control pot and a control piston that is axially movable therein. The control pot is shaped from a sheet metal has at least one stop that projects into the control space, axially supports the control piston at least indirectly, and defines a soft damping force characteristic. The stop is produced by a plastic deformation of the control pot.

First claim

The invention claimed is:

1. A damping valve arrangement for a vibration damper, comprising:
a cylinder that is at least partially filled with a damping fluid;
a piston rod;
an axially displaceable damping piston arranged inside the cylinder, and axially secured to the piston rod that divides the cylinder into a first working space on the piston rod side and a second working space remote of the piston rod;
at least one flow channel formed in the damping piston;
at least one valve disk covering the at least one flow channel; and
a control arrangement arranged at the piston rod coaxial to the damping piston, comprising:
a sheet metal control pot with a cylindrical pot wall and a disk-shaped pot base arranged at an end of the sheet metal control pot remote of the damping piston;
an axially displaceable control piston arranged in the sheet metal control pot and that axially limits a control space enclosed in the sheet metal control pot,
an inlet connection that connects the first working space to the control space;
an outlet connection that connects the control space to the second working space;
at least one spring arrangement arranged between the control piston and the damping piston, and configured to load the at least one valve disk axially in direction of the at least one flow channel and the control piston in direction of the disk-shaped pot base with a defined spring force; and
at least one stop that projects from the disk-shaped pot base into the control space and axially supports the control piston at least indirectly and defines a soft damping force characteristic,
wherein the at least one stop is produced by plastic deformation of the sheet metal control pot in a direction of an interior of the pot, and there is a respective indent in an outer surface of the disk-shaped pot base corresponding to the at least one stop.

2. The damping valve arrangement for a vibration damper according to claim 1 , wherein the sheet metal control pot has a portion with reduced cross section formed at the disk-shaped pot base.

3. The damping valve arrangement for a vibration damper according to claim 1 , wherein the at least one spring arrangement comprises a series connection of at least two disk springs connected in parallel.

4. The damping valve arrangement for a vibration damper according to claim 1 , further comprising:
a stop element; and
a tubular guide bushing adjoining the stop element arranged between the damping piston and the disk-shaped pot base of the control arrangement,
wherein the control piston surrounds the tubular guide bushing in circumferential direction and slides axially on an outer surface of the tubular guide bushing during a change in volume in the control space.

5. The damping valve arrangement for a vibration damper according to claim 4 , wherein the stop element has a greater outer diameter than the tubular guide bushing.

6. The damping valve arrangement for a vibration damper according to claim 4 , wherein the control arrangement has the stop element that limits an axial movement of the control piston in direction of the damping piston and defines a maximum pre-loading of the at least one spring arrangement.

7. The damping valve arrangement for a vibration damper according to claim 1 , wherein the control arrangement has a stop element that limits an axial movement of the control piston in direction of the damping piston and defines a maximum pre-loading of the at least one spring arrangement.

8. The damping valve arrangement for a vibration damper according to claim 1 , wherein the control piston has an inner extrusion edge that prevents an extrusion of a seal ring arranged between the control piston and a tubular guide bushing.

9. The damping valve arrangement for a vibration damper according to claim 8 , wherein an outer extrusion edge of the control piston and the inner extrusion edge of the control piston are arranged axially substantially in a plane.

10. The damping valve arrangement for a vibration damper according to claim 1 ,
wherein the control piston comprises a compensation ring arranged between the control piston and the cylindrical pot wall configured to compensate for manufacturing tolerances of the sheet metal control pot and the control piston,
wherein the compensation ring permits a defined leakage between the control piston and the cylindrical pot wall so that the damping fluid can escape from the control space, the outlet connection being at least partially defined in this way.

11. The damping valve arrangement for a vibration damper according to claim 10 , wherein the control piston has an outer extrusion edge that prevents an extrusion of the compensation ring arranged between the control piston and the sheet metal control pot.

12. The damping valve arrangement for a vibration damper according to claim 1 , wherein the control piston has an outer extrusion edge that prevents an extrusion of a compensation ring arranged between the control piston and the sheet metal control pot.

13. The damping valve arrangement for a vibration damper according to claim 12 , wherein an outer extrusion edge of the control piston and an inner extrusion edge of the control piston are arranged axially approximately in a plane.

14. The damping valve arrangement for a vibration damper according to claim 1 , wherein an outer extrusion edge of the control piston and an inner extrusion edge of the control piston are arranged axially approximately in a plane.

15. The damping valve arrangement for a vibration damper according to claim 1 , wherein the axially displaceable damping piston and the control arrangement are arranged serially inside the cylinder in a non-overlapping manner.

16. The damping valve arrangement for a vibration damper according to claim 1 , wherein the at least one stop that projects from the disk-shaped pot base radially inside an outer diameter of the disk-shaped pot base.

17. A The damping valve arrangement for a vibration damper, comprising:
a cylinder that is at least partially filled with a damping fluid;
a piston rod;
an axially displaceable damping piston arranged inside the cylinder, and axially secured to the piston rod that divides the cylinder into a first working space on the piston rod side and a second working space remote of the piston rod;
at least one flow channel formed in the damping piston;
at least one valve disk covering the at least one flow channel; and
a control arrangement arranged at the piston rod coaxial to the damping piston, comprising:
a sheet metal control pot with a cylindrical pot wall and a disk-shaped pot base arranged at an end of the sheet metal control pot remote of the damping piston;
an axially displaceable control piston arranged in the sheet metal control pot and that axially limits a control space enclosed in the sheet metal control pot,
an inlet connection that connects the first working space to the control space;
an outlet connection that connects the control space to the second working space;
at least one spring arrangement arranged between the control piston and the damping piston, and configured to load the at least one valve disk axially in direction of the at least one flow channel and the control piston in direction of the disk-shaped pot base with a defined spring force; and
at least one stop that projects into the control space and axially supports the control piston at least indirectly and defines a soft damping force characteristic,

wherein the at least one stop is produced by plastic deformation of the sheet metal control pot in a direction of an interio

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Förster Andreas

Classifications

• F16F9/3488 Primary

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

• F16F9/5126

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

• F16F2228/066

  Variable stiffness · CPC title

• F16F9/3485

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

• F16F2228/08

  pre-stressed · CPC title