Patent ID: 8122873
Filing Date: 2012-02-28
Classification: F02M

Abstract:
1. An exhaust gas recirculation system for an internal combustion engine, comprising: a housing that has an interior passage space, through which exhaust gas of the internal combustion engine is recirculated from an exhaust passage to an intake passage of the internal combustion engine, wherein the housing is adapted to join with an exhaust gas cooler that is communicatable with the exhaust passage and the intake passage through the interior passage space of the housing; first and second valves, each of which is received in the housing in a manner that enables opening and closing thereof; and an actuator that includes an electric motor, wherein when the electric motor receives an electric power, the electric motor generates a drive force, which drives the first and second valves, wherein: the first valve forms a flow quantity control valve that controls a flow quantity of the exhaust gas, which passes through the interior passage space of the housing; the second valve forms a mode change vale that changes an operational mode of the exhaust gas recirculation system between: the actuator further includes a drive force transmitting mechanism that has: the first rotary member includes an engaging element that is rotatable about a rotational axis thereof; the second rotary member includes a cam portion that is engageable with the engaging element of the first rotary member through a predetermined synchronization range, in which movement of the first valve and movement of the second valve are synchronized with each other; and the cam portion of the second rotary member is disengaged from the engaging element of the first rotary member when the first valve and the second valve are out of the predetermined synchronization range.