| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an EGR device provided with a directional control valve constituted such that the presence or the absence of EGR cooling can be switched according to the operation state of an engine and operation stability is further improved. <P>SOLUTION: In an exhaust gas recirculation device (an EGR device 10) formed such that a cooler passage (13b) to cool EGR and a bypass passage (13a) bypassing the cooler passage are situated in parallel and a switching valve (15) selectively switching communication of the two passages with an exhaust manifold (5) is situated at the branch part for the two passages, the switching valve is provided with a valve shaft provided at one end with a poppet valve (18), at the other end with a diaphragm actuator (16), and at an intermediate part with a slide supporting valve shaft (32), a cooler port valve seat (29b) communicated with the cooler passage, and a bypass valve seat (29a) communicated with the bypass passage, and formed that a bypass port valve seat is arranged on the diaphragm side in a state that an input port (25) communicated with an exhaust manifold is situated between, and the cooler port valve seat is situated on the anti-diaphragm side. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
