Coiled filter for hydraulic component

Patent metadata

Field	Value
Publication number	US-2021102562-A1
Application number	US-201916593558-A
Country	US
Kind code	A1
Filing date	Oct 4, 2019
Priority date	Oct 4, 2019
Publication date	Apr 8, 2021
Grant date	—

Abstract

A coiled filter for use in a hydraulic braking system of a vehicle comprises a coiled mesh-like structure which is configured to be installed around a first surface of a cylindrical hydraulic component. The coiled filter is configured to have an internal spring force as a retention force which couples the filter to the first surface of the cylindrical hydraulic component. The filter may be pre-coiled prior to installation by plastically deforming to a diameter that is smaller than the diameter of the cylindrical hydraulic component on which the filter is installed.

First claim

What is claimed is:

1 . A filter comprising:
a coiled mesh-like structure which is configured to be installed around a first surface of a cylindrical hydraulic component, and wherein the filter is configured to have an internal spring force as a retention force which couples the filter to the first surface of the cylindrical hydraulic component.

2 . The filter of claim 1 wherein the cylindrical hydraulic component includes an internal passage and at least one passageway extending radially outwardly to the outside of the cylindrical hydraulic component.

3 . The filter of claim 2 wherein the filter is configured to be installed proximate to the at least one passageway, such that the filter is configured to prevent foreign matter from flowing into the cylindrical hydraulic component.

4 . The filter of claim 1 wherein the filter is pre-coiled prior to installation by plastically deforming to a second diameter that is smaller than a first diameter of the first surface of the cylindrical hydraulic component.

5 . The filter of claim 1 wherein the cylindrical hydraulic component includes at least one undercut portion having a third diameter, wherein the third diameter is less than a first diameter of the first surface of the cylindrical hydraulic component, and wherein the filter is disposed within the at least one undercut portion.

6 . The filter of claim 5 wherein the filter and the cylindrical hydraulic component are configured to be installed into a bore.

7 . The filter of claim 1 wherein the cylindrical hydraulic component is a valve body for a braking system.

8 . A method of installing a filter onto a cylindrical hydraulic component comprising the steps of:
coiling a filter until it has plastically deformed to a first diameter, stretching the filter around a first surface of the cylindrical hydraulic component by stretching the filter to a second diameter that is larger than the first diameter, and allowing the filter to elastically return to a third diameter that is larger than the first diameter and smaller than the second diameter, wherein the third diameter is configured such that the filter engages with the first surface of the cylindrical hydraulic component and provides a retention force to hold the filter in place against the cylindrical hydraulic component.

9 . The method of claim 8 further including the step of spot-welding the filter to the cylindrical hydraulic component.

10 . A hydraulic component comprising:
a cylindrical component having a first surface; and a coiled filter, wherein the coiled filter engages the first surface of the cylindrical component, wherein the coiled filter is pre-stressed such that a retention force is generated against the first surface of the cylindrical component, wherein the retention force is sufficient to hold the filter in place against the cylindrical component.

11 . The hydraulic component of claim 10 , wherein the first surface of the cylindrical component is an outer surface, such that the coiled filter is disposed around the first surface of the cylindrical component, and the retention force is directed radially inward from the filter into the first surface of the cylindrical component.

12 . The hydraulic component of claim 11 , wherein the cylindrical component further includes at least one undercut portion having a first diameter, wherein the first diameter is less than the diameter of the first surface of the cylindrical component, and wherein the filter is disposed within the at least one undercut portion.

13 . The hydraulic component of claim 12 , wherein the filter and the cylindrical component are configured to be installed into a bore.

14 . The hydraulic component of claim 10 , wherein the cylindrical component includes at least one internal cavity.

15 . The hydraulic component of claim 14 , wherein the first surface of the cylindrical component is an inner surface, such that the coiled filter is disposed inside of the first surface of the cylindrical component, and the retention force is directed radially outward from the filter into the first surface of the cylindrical component.

Assignees

• Zf Active Safety Us Inc

Inventors

• Ruck Gunther
• Sader Mohamad
• Barron Richard J
• Murphy Brian

Classifications

• F15B21/041 Primary

  Removal or measurement of solid or liquid contamination, e.g. filtering · CPC title

• F16K27/029

  Electromagnetically actuated valves · CPC title

• F15B13/02

  Fluid distribution or supply devices characterised by their adaptation to the control of servomotors · CPC title

• B01D29/96

  in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters (B01D29/09, B01D29/70 take precedence) · CPC title

• B01D29/112

  Ring shaped filters wherein both opposite axial sides are opened and the axial length is shorter than the diameter, e.g. as used in hydraulic transmission systems · CPC title