Patent ID: 6273058
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, comprising at least one valve (2) provided with a body (4) defining a channel (5) and a movable shutter (7) arranged in said channel (5) and coupled to a drive shaft (8), and means of controlling the shutter comprising a balancing device (20) for balancing back-pressure exerted by the shutter on the gas, the balancing device being designed to operate when the shutter (7) is in a closed position and when a predetermined back-pressure threshold is reached and to open an outlet pipe (21) as soon as the back-pressure reaches said threshold and to keep the outlet pipe (21) open above said threshold, regardless of a speed of the engine, in order to create a suitable exhaust gas leak flow rate, the balancing device (20) comprising a calibrated flap (22) arranged in said outlet pipe (21) and a compression spring (27) biasing a rear surface of said calibrated flap (22), the spring being calibrated to said threshold value, wherein the balancing device (20) is incorporated into the body (4) of the valve (2) and comprises a guide bush (10) supporting the shaft (8) and provided with an axial housing (23) designed to receive said calibrated flap (22) and the spring (27) coaxial with said shaft (8) and the outlet pipe (21) is arranged substantially perpendicular to the shaft (8) and opens into the channel (5) downstream from said shutter so as to create, in association with said balancing device (20), a circuit for diverting part of the exhaust gas flow.