Filter device and fixing means comprising a filter device of this type

Patent metadata

Field	Value
Publication number	US-11471809-B2
Application number	US-201816641783-A
Country	US
Kind code	B2
Filing date	Aug 7, 2018
Priority date	Sep 1, 2017
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

A filter for use at an airflow opening of bellows of a shock absorber. The filter device includes a filter body through which a gas, in particular air, can flow in in the direction of an air inflow direction and out in the direction of an air outflow direction. The airflow opening is a joint air inlet and air outlet opening. A fastening means is disclosed that is fitted with a filter, in particular a fastening ring fitted therewith, for fastening bellows to a shock absorber.

First claim

What is claimed is:

1. A filter device for use at an airflow opening of bellows of a shock absorber, the filter comprising:
a filter body configured to fit to an airflow opening of a bellows and configured to permit a gas to enter in the direction of an air inflow direction and exit in the direction of an air outflow direction, wherein the airflow opening is a joint air inlet and air outlet opening; and
a movable filter body frame that holds the filter body and is movable relative to the shock absorber, the movable filter body frame being air-permeable in the air inflow and air outflow direction, wherein the movable filter body frame is configured to be exposed to a restoring force.

2. The filter device of claim 1 wherein the filter body is produced from a flexible, mat-like material exhibiting a restoring force.

3. The filter device of claim 2 wherein the filter body or the filter body frame can be moved by the restoring force into an inoperative position in which the filter body closes the at least one joint air inlet and air outlet opening in the air inflow direction and also in the air outflow direction in a filtering manner up to a predefined air outflow pressure.

4. The filter device of claim 2 wherein the filter body or the filter body frame is moved against the restoring force from the inoperative position into a working position during an outflow of air at a pressure higher than the predefined air outflow pressure, in the air outflow direction.

5. The filter device of claim 4 wherein an opening degree of the working position of the filter body or the filter body frame is limited by a stop.

6. The filter device of claim 1 wherein a bypass surrounding the filter body is provided as an excess pressure relief mechanism which comprises a pressure relief closure in the form of a non-return valve which closes the bypass and automatically opens it for pressure relief from a predefined air outflow pressure.

7. The filter device of claim 1 wherein the filter body is configured as a particle filter and/or as a harmful substance filter.

8. The filter device of claim 1 wherein the airflow opening comprises a plurality of airflow openings, wherein the filter body comprises a separate filter body for each airflow opening.

9. A fastening ring, comprising the filter device of claim 1 , the fastening ring configured to fasten bellows to a shock absorber.

10. The filter device of claim 1 wherein the airflow opening comprises a plurality of airflow openings, the filter device comprising a single joint filter body for the plurality of airflow openings.

11. The filter device of claim 1 wherein the filter body is fixed at only one side of the filter body.

12. The filter device of claim 1 wherein a side of the filter body is fastened to a channel forming the airflow opening, wherein a remaining portion of the filter body is freely movable.

13. The filter device of claim 1 wherein the movable filter body frame seals the airflow opening.

14. The filter device of claim 1 wherein both the filter body and the filter body frame are configured to be exposed to the restoring force, wherein the restoring force is adjustable.

15. The filter device of claim 1 wherein the movable filter body frame is foldable.

16. The filter device of claim 15 wherein the movable filter body frame is configured to vibrate when the filter body frame folds back and strikes the outflow opening or a stop.

17. A filter device for use at an airflow opening of bellows of a shock absorber, the filter device comprising:
a filter body configured to fit to an airflow opening of a bellows and configured to permit a gas to enter in the direction of an air inflow direction and exit in the direction of an air outflow direction; and
an excess pressure relief mechanism,
wherein the airflow opening is a joint air inlet and air outlet opening.

18. The filter device of claim 17 wherein the pressure relief mechanism includes a non-return function.

19. A filter device for use at an airflow opening of bellows of a shock absorber, the filter device comprising:
a filter body that is configured to fit to an airflow opening of a bellows, configured to permit a gas to enter in the direction of an air inflow direction and exit in the direction of an air outflow direction, and configured to be self-cleaning,
wherein the airflow opening is a joint air inlet and air outlet opening.

20. The filter device of claim 19 wherein the self-cleaning of the filter body takes place through a deformation of the filter body and/or through tapping and/or blowing off when the filter body or the filter body frame moves from an inoperative position into a working position and back or strikes a stop delimiting an opening angle.

Assignees

• Thyssen Krupp Bilstein Gmbh
• Thyssenkrupp Ag

Inventors

• Schmidt Klaus

Classifications

• B01D46/0087

  Bypass or safety valves · CPC title

• B01D2275/203

  Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size · CPC title

• F16F9/0454

  characterised by the assembling method or by the mounting arrangement, e.g. mounting of the membrane (F16F9/0409, F16F9/0445 take precedence) · CPC title

• F16F9/3285

  for filtering (filters per se B01D) · CPC title

• B01D46/0005

  Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence) · CPC title