Electric tool with C-shaped torque transmission member

摘要

In an electric disc grinder, there is provided, between a driven gear and a spindle in a torque transmission system, a C-shaped spring member capable of elastic deformation in a diameter enlarging direction. With respect to the rotating direction, the spring member is engaged with a driving protrusion of the driven gear and a driven protrusion of a joint sleeve of the spindle; when transmitting the rotation of the driven gear to the spindle, the spring member undergoes elastic deformation in the diameter enlarging direction depending on the driven side load, thereby mitigating the starting shock. An abutment surface of the driven protrusion is formed as an inclined surface causing an end portion of the spring member contacting with the abutment surface to slide radially outwards. As a result, the spring member can easily undergo elastic deformation in the diameter enlarging direction.

主权项

1. An electric tool comprising:
a power transmission device configured to transmit torque of an electric motor to a driven object, the power transmission device having a C-shaped torque transmission member capable of radial elastic deformation and interposed, in a plane perpendicular to a rotational axis of two rotary members in a torque transmission system, between an inner circumferential surface of one of the two rotary members and an outer circumferential surface of the other of the rotary members, the torque transmission member being configured to transmit torque in a state (i) that one end thereof in a rotating direction contacts an abutment surface of the one rotary member and (ii) that the other end of the torque transmission member in the rotating direction contacts an abutment surface of the other rotary member, wherein, when the abutment surface of at least one of the rotary members contacts the corresponding end of the torque transmission member, the abutment surface is opposed to and inclined relative to an end surface of the corresponding end so that the corresponding end slides in a radial direction along the abutment surface.