| 摘要 |
The present invention relates to a three-pass heat exchanger (41) for an EGR system, comprising a casing (43) housing at least one cooling chamber for gas circulating through a plurality of pipes and heads on its ends coupled to the gas inlet pipe coming from the exhaust manifold and to the gas outlet pipe connected to the intake manifold of the engine, which is configured as a three-pass heat exchanger, i.e. with three differentiated areas (51, 53, 55) for gas circulation from the inlet pipe to the outlet pipe, the inlet pipe and the outlet pipe being located at opposite ends of the exchanger. The first gas circulation area (51) occupies one of the halves of the casing (43), the second gas circulation area (53) and the third gas circulation area (55) occupying the other half, this latter area being located on a side close to the casing (43). The exchanger can include a bypass valve (68) and two cooling chambers (61, 63) at different temperatures. |
