POWER TOOL WITH PLASTIC-MADE GEAR SYSTEM

摘要

PURPOSE: To make a carrier frame and a shaft unit of a power tool at a low production cost and to inexpensively assemble the carrier frame and the shaft unit. CONSTITUTION: A plastic cylindrical ring gear 31 is fixed to a motor 20 by coaxially surrounding a pinion gear 22. A plastic gear carrier frame 60 is molded by injecting a splined end of a metallic output shaft 51, can be stored within the ring gear 31 and has a radial slot 69 for receiving pins 71 of three planet gears 70. A stub shaft part 66 has an elastomeric O-ring 68 in the surrounding groove. A ball bearing 48 is press-fitted in a seat within the ring gear 31.