EGR gas cooler

摘要

An EGR gas cooler comprises an array of tubes 34 disposed in a barrel 31 and supported by a plate 36. The plate 36 has tongues 45 on the outer periphery which are curved at a diameter slightly greater than the internal diameter of the barrel such that the plate can be slid into and yet retained securely relative to the barrel. Through holes 37 in the plate for receiving the tubes are provided with tongues 45 curved at a diameter slightly smaller than the outside diameter of the tubes. Dotted amongst the holes 37 for receiving the tubes are perforations (47a, figures 6a, 6b) which permit circulation of cooling fluid through the heat exchanger. Slits (47b) and/or notches (37a) may also be provided to allow the circulation. The plate may be brazed into position.