Abstract: An oil cooler 2 as a heat exchanger includes a male plate 100 having an upper surface 100a as a first surface configured to contact cooling water that is a heat medium, and a plurality of linearly extending protrusions 104 are formed at the upper surface 100a.

Abstract: A method of manufacturing a cylindrical ring member includes a step of forming a metal intermediate material having a cylindrical portion and a chamfering step by cold forging in which a normal chamfer portion is formed on an axial end peripheral edge of the cylindrical portion by pressing a radial end portion of an axial end surface of the cylindrical portion against an annular chamfering surface provided in a mold configuring a mold device. A chamfering step is performed by cold forging in a state where a preliminary chamfer portion, of which a width dimension in a radial direction is larger than a width dimension of the normal chamfer portion in a radial direction, is formed on the axial end peripheral edge of the cylindrical portion.

Abstract: A method of manufacturing a cylindrical ring member includes a step of forming a metal intermediate material having a cylindrical portion and a chamfering step by cold forging in which a normal chamfer portion is formed on an axial end peripheral edge of the cylindrical portion by pressing a radial end portion of an axial end surface of the cylindrical portion against an annular chamfering surface provided in a mold configuring a mold device. A chamfering step is performed by cold forging in a state where a preliminary chamfer portion, of which a width dimension in a radial direction is larger than a width dimension of the normal chamfer portion in a radial direction, is formed on the axial end peripheral edge of the cylindrical portion.

Abstract: The present invention provides a method for working an outer race of a one-way clutch of roller type comprising an outer race having pockets provided at their inner surfaces with cam surfaces, an inner race spaced inwardly from the outer race in a radial direction and disposed in concentric with the outer race, and a plurality of rollers disposed in the pockets and adapted to transmit torque between the outer race and the inner race when engaged by the cam surfaces, wherein the cam surfaces of the outer race are formed by milling working.