Exhaust system in internal combustion engine

Details Exhaust system in internal combustion engine Exhaust system in internal combustion engine

1996-01-26

1998-01-27

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181254, 181265, 181272, 181282, F01N 108

Patent

active

057124540

ABSTRACT:
An exhaust system in an internal combustion engine includes a flow rate regulating valve which is positioned in an intermediate portion of an exhaust gas flow passage. The flow rate regulating valve has a rotary shaft rotatably supported in a valve housing, and a rotationally biasing spring mounted between the rotary shaft and the valve housing which provides a spring force to rotationally bias the rotary shaft. In the exhaust system, an axially biasing spring is mounted separately from the rotationally biasing spring between the valve housing and the rotary shaft for biasing the rotary shaft in an axial direction. The rotary shaft is provided with an abutment surface which faces in the one axial direction, and the valve housing is provided with a limiting portion which abuts against the abutment surface to limit the axial movement of the rotary shaft. Thus, the rotary shaft is biased in the one axial direction by the axially biasing spring, and the abutment surface of the rotary shaft is urged against the limiting portion of the valve housing, thereby avoiding the axially chattering of the rotary shaft.

REFERENCES:
patent: 3620330 (1971-11-01), Hall
patent: 4484659 (1984-11-01), Buchwalder
patent: 4699244 (1987-10-01), Bergquist et al.
patent: 4971166 (1990-11-01), Hase
patent: 5614699 (1997-03-01), Yashiro et al.

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