Damping valve

Patent metadata

Field	Value
Publication number	US-9810280-B2
Application number	US-201415021731-A
Country	US
Kind code	B2
Filing date	Sep 17, 2014
Priority date	Sep 17, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A damping valve includes a valve seat member that includes a port and a first valve seat, a shaft member disposed on the valve seat member, an annular main valve element that is mounted on the shaft member, seats on and separates from the first valve seat, and includes a second valve seat on an opposite side of the valve seat member, a sub valve element that is mounted on the shaft member, and seats on and separates from the second valve seat, a valve-element-between chamber that is disposed between the main valve element and the sub valve element, and on an inner peripheral side of the second valve seat, a restrictive passage that causes the port to be communicated with the valve-element-between chamber to provide a resistance to a flow of a passing fluid, a main valve element biasing part biasing the main valve element to the valve seat member side, and a sub valve element biasing part biasing the sub valve element to the main valve element side. The restrictive passage is formed of a ring-shaped gap between the main valve element and the shaft member.

First claim

The invention claimed is:

1. A damping valve, comprising:
a valve seat member that includes a port and a first valve seat, the first valve seat surrounding the port;
a shaft member disposed on the valve seat member;
an annular main valve element mounted movable in an axial direction with respect to the shaft member, the main valve element seating on and separating from the first valve seat, and the main valve element including a second valve seat on an opposite side of the valve seat member;
a sub valve element mounted on the shaft member, the sub valve element seating on and separating from the second valve seat;
a valve-element-between chamber disposed between the main valve element and the sub valve element, and on an inner peripheral side of the second valve seat;
a restrictive passage that causes the port to be communicated with the valve-element-between chamber to provide a resistance to a flow of a passing fluid;
a main valve element biasing part configured to bias the main valve element to the first valve seat; and
a sub valve element biasing part configured to bias the sub valve element to the annular main valve element, wherein
the restrictive passage is formed of a ring-shaped gap between the main valve element and the shaft member.

2. The damping valve according to claim 1 , wherein
the main valve element biasing part is a disc spring secured to the shaft member, and
the main valve element includes a protrusion to which an outer periphery of the disc spring fits with an interval, and the disc spring defines the position of the main valve element in a radial direction.

3. The damping valve according to claim 1 , wherein
the first valve seat and the second valve seat are formed in a ring shape, and
the inner diameter of the second valve seat has a large diameter compared with the inner diameter of the first valve seat.

4. The damping valve according to claim 1 , wherein
the sub valve element biasing part includes a back pressure chamber on an opposite side of the main valve element in the sub valve element, and
the sub valve element is configured to be biased by a pressure in the back pressure chamber.

5. The damping valve according to claim 4 , wherein
the back pressure chamber includes a pilot passage to which a pressure on the upstream side of the port is reduced and introduced.

Assignees

• Kyb Corp

Inventors

• Hagidaira Shinichi

Classifications

• F16F9/348 Primary

  Throttling passages in the form of annular discs {or other plate-like elements which may or may not have a spring action}, operating in opposite directions {or singly, e.g. annular discs positioned on top of the valve or piston body (F16F9/341, F16F9/3415 take precedence)} · CPC title

• F16F9/34 Primary

  Special valve constructions ({F16F9/44, F16F9/50 take precedence; filtering details F16F9/3285} ; valves in general F16K); Shape or construction of throttling passages · CPC title

• F16F2228/066

  Variable stiffness · CPC title

• F16F9/46

  allowing control from a distance {, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall (attachment of valve units to cylinders F16F9/325)} · CPC title

• F16F9/50

  Special means providing automatic damping adjustment, {i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs}(F16F9/53 takes precedence); {Special means providing self-adjustment of spring characteristics} · CPC title