Oil pulse rotary tool

摘要

A sleeve body with bearings interposed between the sleeve body and a center shaft portion is integrally coupled to an oil pulse generator. A coupling body is rotatable together with the output portion. Balls are fitted between an outer surface of the sleeve body and an inner surface of the coupling body. Cam grooves are L-shaped in plan view, and formed in a portion of the outer surface of the sleeve body at which the balls are fitted. Rotation of the output portion is transmitted from the coupling body to the sleeve body and the oil pulse generator via the balls. When rotational speed between the sleeve body and the coupling body is different, the balls relatively turn in the cam grooves to move the coupling body forward against an urging force of the coil spring so as to relieve an impact.

主权项

1. An oil pulse rotary tool comprising:
a housing; a motor accommodated in the housing; a speed reduction mechanism which is accommodated in the housing and to which a torque is transmitted from the motor; an oil pulse generator accommodated in the housing and disposed in front of and coaxially with an output portion serving as a final stage of the speed reduction mechanism; a sleeve body integrally coupled to the oil pulse generator and externally mounted on and coaxially with a center shaft portion provided to project from a center of rotation of the output portion with a bearing interposed between the sleeve body and the center shaft portion; a coupling body externally mounted on and coaxially with the sleeve body so as to be rotatable together with the output portion and axially movable; a ball fitted between an outer surface of the sleeve body and an inner surface of the coupling body across the outer surface of the sleeve body and the inner surface of the coupling body; a cam groove that is formed from a center axis side of the sleeve body toward an outer surface side of the sleeve body, where the cam groove is inclined from the center axis side of the sleeve body toward a portion of the outer surface of the sleeve body at which the ball is fitted; and a coil spring externally mounted on the oil pulse generator to urge the coupling body toward a retracted position at which the ball is fitted at a rear end of the cam groove, wherein rotation of the output portion is transmitted from the coupling body to the sleeve body and the oil pulse generator via the ball, wherein when rotational speed between the sleeve body and the coupling body is different, the ball relatively turns in the cam groove to move the coupling body forward against an urging force of the coil spring so as to relieve an impact.