Device for recirculating an exhaust gas stream to the intake conduit of an engine

Claim 1

Exhaust gas recirculation device of an internal-combustion engine, for example a diesel internal-combustion engine with a feedback path (13) leading to the manifold pipe, with a bypass path (23) parallel to the feedback path (13) and bridging it, with an exhaust gas cooler (15) connected by its inlet (16) and its outlet (17) to the bypass path (23), and with a valve device (20), with which the exhaust gas cooler (15) can be selectively bypassed, and having two valves (42, 52), of which the first valve (42) is associated with the feedback path (13) for selective control of the passage through it or to block it, and the second valve (52) is associated with the exhaust gas cooler (15) for selective control of the passage through it or to block it, characterised in that the two valves (42, 52) are combined to form a module and have an actuator (43) common to both, with which the valve closure members (46, 54) of the two valves (42, 52) can be actuated together, and in that this modular valve device (20) is designed as an independent component and is fitted directly to the exhaust gas cooler (15) in the region of the inlet (16) and the outlet (17) or, combined with the exhaust gas cooler (15), forms a module, and in that the first valve (42) associated with the feedback path (13) has a housing passage (45) as its own valve duct, and in that the second valve (52) associated with the exhaust gas cooler (15) has a valve duct (53), and in that the valve device (20) has a feed connection (21) and a discharge connection (22) for the exhaust gas, and in that the housing passage (45) of the first valve (42) and the valve duct (53) of the second valve (52) are each connected into the feedback path (13) via the feed connection (21) and the discharge connection (22).