초록 ▼

A lightweight apparatus designed to cool the EGR gas of an engine efficiently by replacing baffle plates with one or more support plates having a plurality of through holes, which is further made up of a barrel, end caps, a tube sheet, and a plurality of heat transmission tubes. An inlet and an outl

A lightweight apparatus designed to cool the EGR gas of an engine efficiently by replacing baffle plates with one or more support plates having a plurality of through holes, which is further made up of a barrel, end caps, a tube sheet, and a plurality of heat transmission tubes. An inlet and an outlet of the EGR gas are provided on the end caps covering both ends of the barrel and the sheet metal-made tube sheet attached to both ends of an inner wall of the barrel holds the properly arranged heat transmission tubes inserted into the through holes. Each metal sheet-made support plate affixed to a number of spots on the inner wall of the barrel has a diameter a little larger than the inside diameter of the barrel so that its edge is bent inward to fit inside the barrel tight but slidably in the form of tongue-like pieces. In a similar way, a peripheral edge of each through hole is curled up to create another set of tongue-like pieces to fit tight but slidably outside the heat transmission tubes. These pieces enable each support plate to be set at a specified position inside the barrel and their frictional resistance exerts sufficient pressure to secure the support plate steadfastly and durably to the inner wall of the barrel to withstand vibrating environments. Brazing to augment this frictional fixation is preferable. There is a separate circulating route for a cooling medium as well.

대표청구항 ▼

[ What is claimed is:] [1.] An EGR gas cooling apparatus, comprising a barrel having opposed open ends and an inner surface extending between said ends, said inner surface defining an inside diameter, tube sheets affixed to the inner surface of the barrel in proximity to the ends, each said tube she

[ What is claimed is:] [1.] An EGR gas cooling apparatus, comprising a barrel having opposed open ends and an inner surface extending between said ends, said inner surface defining an inside diameter, tube sheets affixed to the inner surface of the barrel in proximity to the ends, each said tube sheet having a plurality of apertures therethrough, a plurality of heat transmission tubes fixedly arranged in the apertures of the tube sheets and extending therebetween, each said heat transmission tube having an outer periphery defining an outside diameter, end caps being mounted on both said ends of the barrel, an inlet and an outlet for EGR gas being provided through said respective end caps, an inlet for a cooling medium and an outlet therefor extending into the barrel at locations between the respective tube sheets, said apparatus comprising:at least one support plate having an outer periphery, a plurality of cooling passages for accommodating the cooling medium extending through the support plate, a plurality of through holes formed through said support plate, said through holes being dimensioned and disposed for receiving the respective heat transmission tubes, each said through hole having a peripheral edge, a plurality of tongue-like pieces selected from the group consisting of a plurality of first tongue-like pieces at the outer periphery of the support plate which are curved at a diameter slightly larger than the inside diameter of the barrel and a plurality of second tongue-like pieces at the peripheral edges of the through holes which are curved at a diameter slightly smaller than the outside diameter of the heat transmission tubes, said support plate being slidably inserted inside the barrel and being disposed at a predetermined position in said barrel as a result of the slidable insertion therein, said tongue-like pieces being deflected at intermediate locations thereon for engagement with selected ones of said barrel and said heat transmission tubes such that said support plate is secured in the predetermined position by frictional resistance between the tongue-like pieces and at least one of the barrel and the heat transmission tubes for elastically supporting said heat transmission tubes in response to vibrations of said apparatus.