| 摘要 |
A peripheral, annular groove is incorporated into a throttle valve connector in one step. A first die and a second die are then inserted into the throttle valve connector and a first plastic material is introduced into a first cylindrical cavity formed thereby in a molten state and hardened, resulting in a plastic insert. The first die and the second die are subsequently removed from the throttle valve connector and a third die and a fourth die are inserted into the throttle valve connector. A second cavity is formed therebetween and filled with a second plastic material, whereby a throttle valve is formed and is fixed during the cooling process by shrinkage on the throttle valve shaft.
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