Patent ID: 7275367
Filing Date: 2007-10-02
Classification: F01N,F02D,F02M,Y02T,Y10T

Abstract:
1. An exhaust pressure-raising device for an internal combustion engine, comprising: a throttle valve disposed in an exhaust channel of an internal combustion engine and is adapted to close to reduce channel area of said exhaust channel and raise exhaust pressure in said exhaust channel; and an exhaust pressure-adjusting valve adapted to be brought into a closed position, in which the exhaust pressure-adjusting valve closes an opening for releasing the exhaust pressure in the exhaust channel, due to a biasing force of a resilient body and is adapted to open against the biasing force of the resilient body due to the exhaust pressure in the exhaust channel, which is raised in response to the closing of the throttle valve, in which an effective open area of the opening is increased or decreased according to displacement of the resilient body, to thereby adjust said raised exhaust pressure, wherein: the exhaust pressure-adjusting valve includes a valve element that closes the opening by the biasing force, and a shield provided independently from the valve element for changing the growth rate of the effective open area of the opening defined by the shield with respect to the displacement of valve element in a valve-opening direction.