| 摘要 |
PURPOSE:To prevent increase of friction resistance between each member, by making one of worm gear or worm wheel of natural duracon, the other of fluorine duracon and the screw member of brass. CONSTITUTION:Upon forward/reverse rotation of a motor 25, a worm gear 26 will rotate to rotate a worm wheel 13 and to advance/back a screw 19 through corporation of the female screw section 13a of said worm wheel 13 and male section 19a of a screw 19 to expand/shrink a plunger 20. Here one of worm gear 26, worm wheel 13 is made of natural duracon, the other of fluorine duracon while the screw 19 of brass, thereby the friction resistance between the teeth of worm gear 26 and worm wheel 13 and between the female section 13a of the worm wheel 13 and the male section 19a of the screw 19 will not increase. |
