| 主权项 |
1. A valve for controlling an exhaust gas recirculation system of an internal combustion engine equipped with a turbine installed in an exhaust circuit of the internal combustion engine, said valve comprising:
a body allowing a circulation of a first flow of exhaust gas extracted upstream of the turbine and a circulation of a second flow of exhaust gas extracted downstream of the turbine, said valve being configured to control the circulation of the first and second flows of exhaust gas through said body; a first piston valve able to control the circulation of the first flow of exhaust gas; a second flap able to control the circulation of the second flow of exhaust gas, the first piston valve being separate from the second flap; a first drive device for driving the first piston valve in rotation, the latter imposing at least one translational movement on a first sealing element of a first duct arranged in the body, wherein the first piston valve comprises a first guide case linked in rotation to a lifting bar which is rotationally integral with a shaft fixed to the first sealing element, the shaft comprising two ends engaged in at least one helicoidal groove arranged on the body, wherein the first guide case moves along a first angular sector during which it controls a closure of the first sealing element, and along a second angular sector during which the first sealing element is held closed, and wherein the first guide case comprises a skirt on which an undercut is arranged, a first segment of the skirt which delimits the undercut acts on the lifting bar to open the first sealing element, a second segment of the skirt which delimits the undercut acts on the shaft to close the first sealing element, said undercut comprising a clearance zone from the lifting bar; and wherein said clearance zone authorizes rotation of the first guide case without driving the lifting bar in rotation. |
