| 摘要 |
PURPOSE:To allow a surface temperature of a steering wheel to be increased or decreased in a short time to a temperature at which an operator may grasp the steering wheel, by making a resin portion of a hard polyurethane form having a surface hardness of 70 and over as measured with a Type C hardness tester. CONSTITUTION:The steering wheel is constituted of a frame portion 1 consisting of a ring-like rim core metal 11 and three spokes 12, and a resin portion 2 made of hard polyurethane form formed around the rim core metal 11. An outer skin layer 21 having a thickness of 15mu is formed on the outer surface of the resin portion 2. This steering wheel is formed in such a manner that urethane resin paint is coated on a mold having the same cavity shape as a traditional cavity shape, and then the frame portion 1 which is the same as a traditional one is inserted into the mold, and the hard polyurethane form is injected into the cavity. |
