Patent ID: 7905203

Claim:
An oil cooler for a vehicle, comprising: a casing having a substantially cylindrical sidewall part with a central axis and comprising a first outer case wall portion disposed at a first radial distance from the central axis; a heat exchange core housed in the casing such that a cooling water passage is formed around the heat exchange core, the heat exchange core having an inlet-side oil passage and an outlet-side oil passage formed therein which extend parallel to each other and substantially parallel to the central axis of the sidewall part, and the heat exchange core enables oil to be delivered from the inlet-side oil passage to the outlet-side oil passage, wherein the first outer case wall portion is spaced a first distance away from an outer edge portion of the heat exchange core so as to form a first channel portion therebetween having a first depth; and an inlet pipe and an outlet pipe which are connected to the sidewall part, the inlet pipe forming a cooling water inlet passage communicating with the cooling water passage, and the outlet pipe forming a cooling water outlet passage communicating with the cooling water passage, wherein, outward of the inlet-side oil passage, an outwardly swelling part is formed in the sidewall part of the casing, the outwardly swelling part extending outwardly beyond the first outer case wall portion so as to be disposed a second radial distance from the central axis which is greater than the first radial distance, the outwardly swelling part also spaced a second distance away from the outer edge portion of the heat exchange core so as to form a second channel portion therebetween having a second depth which is greater than the first depth, whereby the size of the cooling water passage is increased in the outwardly swelling part.