Exhaust gas throttle valve for engines

Details Exhaust gas throttle valve for engines Exhaust gas throttle valve for engines

Filed on

2005-04-08

Date issued

2008-08-05

Examiner

Denion, Thomas (Department: 3748)

Patent Class

Power plants

SubClass

Internal combustion engine with treatment or handling of...

SubSubClass

Divider, collector, valve means, or boundary layer device...

Other Related Categories

C060S292000, C123S337000

Type

Reexamination Certificate

Status

active

Patent number

07406823

Description

ABSTRACT:
An exhaust gas throttle valve disposed in the exhaust system of an engine, wherein the center axis of rotation of a valve shaft5is set at a position deviated from the center axis of the exhaust gas passage, and two recessed portions11are symmetrically formed in the circumferential portion of a valve body4by cutting the surface thereof. The positions where the recessed portions11are formed are on the side of the center axis of the exhaust gas passage beyond the center axis12of rotation, and at where the peripheral portion of the valve body4faces the edge portions9where insertion holes8for the valve shaft5are opened in the exhaust gas passage. At these positions, the distance is a minimum between the peripheral portion of the valve body4and the edge portions9. The recessed portions11work to increase the gap relative to the edge portions9at that positions. It is therefore made possible to approximate the peripheral portion of the valve body4to the tubular wall of the exhaust gas passage2when the exhaust gas throttle valve is closed preventing the valve body4and the edge portions9from coming in contact together despite of the thermal expansion.

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