Enclosed mechanical booster

摘要

To improve reliability of a shaft sealing portion of a mechanical booster and simplify the structure, in a mechanical booster 1 having a motor 3 in tight contact with to a mechanical booster body 2 and rotating the shaft part 4, inserting a metal cylinder into a gap between a stator on a rotary shaft of the motor 3 and a fixed coil on the outside for partitioning stator area and a fixed coil area by the cylinder, supporting the both end of the rotary shaft of the motor 3 by bearings sealed with lubricant, and inserting a bearing fitting portion of a motor cover 30 into inside of the cylinder, the motor is sealed with a seal ring. The cylinder is made of stainless steel. A jacket water cooler is provided in the motor cover 30 around at area close to outside. The shaft part 4 of the mechanical booster body 2 is supported by bearings sealed with lubricant.