| 摘要 |
PURPOSE:To improve the accuracy of concentricity by forming two fitting parts to be inserted with two bearings and two or more axial grooves for positioning, at the periphery of one of two small core molds, and then surrounding them with an outer mold. CONSTITUTION:Two small and medium molds 1 and 2 are coupled with each other, and their peripheries are surrounded by an outer mold 3 so as to form a bearing tower 15. An engaging part 16, to which a bearing 5 is set, is made a specified dimension apart at the periphery of one side (mold 1 in the figure) of the small and medium molds. Moreover, two or more (three in the figure) grooves 8 are made axially in parallel with the axis at the periphery of the mold 1. On the other hand, bar-shaped projections 10 as many as the grooves 8 are made in parallel with the axis at the mold 2, and those are inserted in the grooves 8 of the mold 1 so as to combine the molds 1 and 2. Next, fused resin is injected from the gate omitted from the figure into a vacant chamber 4 so as to mold the product. |
