Abstract: A heat exchanger (12, 12B, 12C, 12D) usable as an oil cooler is provided for exchanging heat between first and second fluids. The heat exchanger has an outer periphery (112, 156, 58′, 366) spaced from a central axis (56). The heat exchange includes an inlet (42, 378) and an outlet (44, 380) for flow of the first fluid, a pair of juxtaposed tube segments (52, 54) coiled about the central axis (56) to form a plurality of alternating concentric coils (58), an inlet (46) for flow of the second fluid into heat exchanger (12A, 12B, 12C, 12D), an outlet (48) for flow of the second fluid from the heat exchanger (12A, 12B, 12C, 12D), and structure (50) for encapsulating the pair of tube segments (52, 54) to retain the second fluid within the heat exchanger (12A, 12B, 12C, 12D) as it flows from the inlet (46) to the outlet (48). The tube segment (52) has an end (64) connected to the inlet (42) to receive flow of the first fluid therefrom.

Abstract: A heat exchanger (12, 12B, 12C, 12D) usable as an oil cooler is provided for exchanging heat between first and second fluids. The heat exchanger has an outer periphery (112, 156, 58′, 366) spaced from a central axis (56). The heat exchange includes an inlet (42, 378) and an outlet (44, 380) for flow of the first fluid, a pair of juxtaposed tube segments (52, 54) coiled about the central axis (56) to form a plurality of alternating concentric coils (58), an inlet (46) for flow of the second fluid into heat exchanger (12A, 12B, 12C, 12D), an outlet (48) for flow of the second fluid from the heat exchanger (12A, 12B, 12C, 12D), and structure (50) for encapsulating the pair of tube segments (52, 54) to retain the second fluid within the heat exchanger (12A, 12B, 12C, 12D) as it flows from the inlet (46) to the outlet (48). The tube segment (52) has an end (64) connected to the inlet (42) to receive flow of the first fluid therefrom.

Abstract: A method of installing a baffle (46) in a tubular header (10), (12) for a heat exchanger includes the steps of a) providing a concavo-convex baffle (60) with a periphery smaller than the internal periphery of the header (10), (12); b) locating the baffle (60) at a desired location within the header (10), (12); and c) applying a compressive force (102), (110) to the baffle (60) to compress the baffle toward a planar shape.

Abstract: A method of installing a baffle in a tubular header for a heat exchanger includes the steps of a) providing a concave-convex baffle with a periphery smaller than the internal periphery of the header; b) locating the baffle at a desired location within the header; and c) applying a compressive force to the baffle to compress the baffle toward a planar shape.

Abstract: Improper assembly and/or dissociation due to improper handling of a tank 10 to header plate 14 joint in a heat exchanger is avoided through the use of a retaining strip 50 having fingers 54 receivable in slots 36 in an upstanding flange 26 surrounding a sealing surface 28 on the header plate 14. The fingers 54 are provided with hook-like formations 60, 62, 64 which lodge behind a surface 44 of the flange 26.