Valve structure

Patent metadata

Field	Value
Publication number	US-2016102770-A1
Application number	US-201514857300-A
Country	US
Kind code	A1
Filing date	Sep 17, 2015
Priority date	Oct 9, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A valve member 38 of a valve structure 32 is rotatably supported from an outer tube 34 by a rotation shaft 40. The rotation shaft 40 is fixed to the valve member 38 at a position inside a tangent to the outer periphery of the valve member 38 and avoiding the center point. A return spring 52 is a tension spring that causes tension force to constantly act on a link arm 54 to generate a rotation force toward the closing direction of the valve member 38.

First claim

What is claimed is:

1 . A valve structure comprising:
a valve member that is provided at an exhaust pipe, and that rotates from a closed position closing off the exhaust pipe to an open position opening the exhaust pipe upon being contacted by exhaust gas; a rotation shaft that is fixed to the valve member at a position, when viewing the valve member along an exhaust gas flow direction, inside a tangent to an outer periphery of the valve member and avoiding a center point of the valve member, and that is attached to the exhaust pipe so as to be capable of rotating; a link member that is fixed to the rotation shaft and includes an action point at a position distanced from the rotation shaft in the flow direction; and a tension spring that is provided at the exhaust pipe, and that causes tension force to constantly act on the action point to generate a rotation force toward a closing direction of the valve member.

2 . The valve structure of claim 1 , wherein a pressure bearing face including the center point of the valve member has a shape bulging toward a downstream side in the flow direction.

3 . The valve structure of claim 2 , wherein a curvature of the pressure bearing face, as viewed in cross-section taken along the flow direction, increases as a distance from the rotation shaft increases, or is constant.

4 . The valve structure of claim 1 , further comprising an outer tube that configures a portion of the exhaust pipe and to which the rotation shaft is attached.

5 . The valve structure of claim 4 , further comprising a recess indented toward an inner side at a portion of the outer tube where the rotation shaft is attached.

6 . The valve structure of claim 4 , further comprising:
a stopper tab provided at the outer tube; a closing direction stopper projection that is provided at the link member, and that contacts the stopper tab and prevents rotation toward the closing direction when the valve member attempts to rotate from the closed position further in the closing direction; and an opening direction stopper projection that is provided at the link member, and that contacts the stopper tab and prevents rotation toward an opening direction when the valve member attempts to rotate from the open position further in the opening direction.

7 . The valve structure of claim 1 , wherein there are two of the action points provided at positions having point symmetry to each other about a center of the rotation shaft.

Assignees

• Toyota Motor Co Ltd

Inventors

• Wakatsuki Kazutoshi
• Takagaki Nakaya
• Komitsu Hideyuki

Classifications

• F16K1/36

  Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) · CPC title

• F16K15/033 Primary

  spring-loaded · CPC title

• F16K1/18

  with pivoted discs or flaps · CPC title

• F16K1/222 Primary

  Shaping of the valve member · CPC title

• F16K1/221

  specially adapted operating means therefor (operating means per se F16K31/00) · CPC title