Oil-cooler-equipped radiator

Abstract

An oil cooler includes a heat exchanger having a plurality of element units stacked in a state communicating with each other, pipe connectors coupled to the heat exchanger in a state communicating with spaces formed respectively at both end portions in the longitudinal direction of the heat exchanger, and a pair of connecting pipes communicating with the spaces from connecting pipe attaching holes formed on the tank via cylindrical portions of the pipe connectors. The cylindrical portions are fixed respectively to rings provided on the outside of the tank at the connecting pipe attaching holes, and joint portions thereof are formed to be exposed to the outside of the tank.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an oil-cooler-equipped radiator which is brazed while an oil cooler is accommodated in a tank of the radiator for a motor vehicle, and the like. [0003] 2. Description of the Related Art [0004] Conventionally, techniques about an oil-cooler-equipped radiator in which an oil cooler is accommodated in a tank of the radiator have been known, which are disclosed in Japanese Patent Application Laid-open Nos. 2001-153586, Hei 10-73393, and Hei 11-142089. [0005] Also, an all-aluminum radiator in which a tank and core portions of a radiator are formed of aluminum has been developed. In this type of radiator, brazing of a tank and an oil cooler is performed while the oil cooler is accommodated in the tank. [0006] However, in the conventional oil-cooler-equipped radiator, for example, when the all-aluminum radiator is brazed, a pipe connector, which is a fixing portion of the oil cooler on the ...

AI Technical Summary

Benefits of technology

[0012] Therefore, along with the heating up of the tank, the heat exchanger is heated up via the heat conduction portion, so that the heat conduction portion of the pipe connector and the inside of the tank can be favorably brazed, and moreover the entire oil cooler including the pipe connector can be smoothly heated up to be brazed.

Problems solved by technology

However, in the conventional oil-cooler-equipped radiator, for example, when the all-aluminum radiator is brazed, a pipe connector, which is a fixing portion of the oil cooler on the tank, is not smoothly heated up, which causes a problem of generating a brazing failure.

If a time period of brazing is extended, zinc diffusion in a radiator tube may proceed and degrade the corrosion resistance of the radiator tube, which is not favorable.

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