Patent ID: 6273059
Filing Date: 2001-08-14
Classification: F02D

Abstract:
A decelerator device (1) mounted in an exhaust gas circuit of a vehicle equipped with a combustion engine, the decelerator device (1) comprising:at least one valve (2) provided with a movable shutter (7) and an actuator cylinder (9) for operating the movable shutter (7), the actuator cylinder comprising a movable piston (11) provided with a rod (12) coupled to the movable shutter (7) to control operation of the movable shutter (7);at least one balancing device (25) for balancing a back pressure exerted by the movable shutter (7) on gas flowing through the exhaust gas circuit, the at least one balancing device operates when the movable shutter (7) is in a closed position, once a predetermined back pressure threshold is reached within the exhaust gas circuit, to allow the movable shutter (7) to move to a partially reopened position (I) and create a suitable exhaust gas leak flow rate past the movable shutter (7) and regulate the back pressure regardless of a speed of the engine of the vehicle;wherein the balancing device (25) is incorporated into the actuator cylinder (9) and is arranged between the movable piston (11) and the rod (12) of the cylinder, the rod (12) moves at stroke distance (C') relative to the movable piston (11), the stroke distance (C') of the rod corresponds to a degree of reopening of the movable shutter (7) and is controlled by at least one calibrated spring device (26) interacting between the movable piston (11) and the rod (12) of the cylinder.