Production manner null of wait for V belt type automatic gearbox

摘要

PURPOSE:To prevent flash from being left on the outer peripheral surface of a weight, which acts as a sliding and rolling surface, by a method wherein resin is poured through pinpoint gates provided on one open end surface of the weight to be molded cylindrically. CONSTITUTION:Three, for example, pinpoint gates 16 are equispaced on the portion, which forms a surface normal to the axis line of a cylinder at one open end surface 8a of a weight 8 to be molded cylindrically. When molten resin is supplied through a sprue 19 to a runner 18, the resin is trifurcated at the tip of the runner 18 and past through the pinpoint gates 16 and flowed from the portion to form the one open end surface 8a of the weight 8 into a cavity 13. The resin filled in the cavity 13 cools down and solidifies itself in order to be formed in a shape corresponding to the cavity 13. As a result, because the weight can be manufactured by pouring the resin from the end surface 8a of the weight 8 in the direction of the axis line of the weight, resulting in leaving no flash on the outer peripheral surface of the weight 8, which acts as the sliding and rolling surface of the weight 8.