Damping valve

Patent metadata

Field	Value
Publication number	US-10132378-B2
Application number	US-201414774172-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 13, 2013
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A damping valve includes a valve seat member provided with a port, a valve body that opens or closes the port, a tubular spool that abuts on a side of the valve body opposite to the valve seat member, a spool holding member that has an outer circumference where the spool is mounted movably along an axial direction, a ring mounted to the outer circumference of the spool holding member, the ring contacting slidably with an inner circumference of the spool, and a back-pressure chamber partitioned by the spool and the spool holding member, the back-pressure chamber being configured to bias the spool such that the valve body is pressed toward the valve seat member using an internal pressure, wherein the internal pressure of the back-pressure chamber is applied to an inner circumferential side of the ring.

First claim

The invention claimed is:

1. A damping valve comprising:
a valve seat member provided with a port;
a valve body that opens or closes the port;
a tubular spool that abuts on a side of the valve body opposite to the valve seat member;
a spool holding member that has an outer circumference where the spool is mounted movably along an axial direction;
a ring mounted to the outer circumference of the spool holding member, the ring contacting slidably with an inner circumference of the spool; and
a back-pressure chamber partitioned by the spool and the spool holding member, the back-pressure chamber being configured to bias the spool such that the valve body is pressed toward the valve seat member using an internal pressure,
wherein the internal pressure of the back-pressure chamber is applied to an inner circumferential side of the ring.

2. The damping valve according to claim 1 , wherein the ring has a bias cut.

3. The damping valve according to claim 1 , further comprising a pilot passage configured to reduce a pressure upstream of the port and guide the pressure into the back-pressure chamber.

4. The damping valve according to claim 3 , further comprising a pilot valve configured to control the internal pressure of the back-pressure chamber.

5. The damping valve according to claim 1 , wherein the valve seat member has a first valve seat that surrounds the port,
the damping valve further comprising a subsidiary valve body seated on or unseated from the first valve seat, the subsidiary valve body having a second valve seat in a side opposite to the valve seat member,
the valve body is seated on or unseated from the second valve seat and forms a valve-body intermediate chamber between the subsidiary valve body and the valve body in an inner circumferential side of the second valve seat,
the damping valve further comprising a restrictive passage that causes the port and the valve-body intermediate chamber to communicate with each other, the restrictive passage being configured to apply resistance to a passing fluid flow, and
the spool presses the subsidiary valve body toward the valve seat member along with the valve body.

6. The damping valve according to claim 5 , wherein the subsidiary valve body is floatably stacked on the valve seat member.

7. The damping valve according to claim 5 , further comprising a subsidiary valve body biasing means configured to bias the subsidiary valve body toward the valve seat member.

8. The damping valve according to claim 5 , wherein both the first and second valve seats have an annular shape, and
an inner diameter of the second valve seat is set to be larger than that of the first valve seat.

9. The damping valve according to claim 5 , wherein the restrictive passage is formed in the subsidiary valve body.

10. The damping valve according to claim 1 , wherein the valve body is an annular leaf valve having an inner circumference fixed to the valve seat member and an outer circumference that can be flexed.

Assignees

• Kayaba Industry Co Ltd
• Kyb Corp

Inventors

• Abe Tomoyasu
• Kamakura Ryosuke
• Mori Toshihiro

Classifications

• 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

• F16F9/465

  using servo control, the servo pressure being created by the flow of damping fluid, e.g. controlling pressure in a chamber downstream of a pilot passage (self-adjustment of damping F16F9/50) · CPC title

• F16F9/46 Primary

  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

• F16K1/42

  Valve seats (for double-seat valves F16K1/44) · CPC title

• F16K27/02

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title