| 摘要 |
An impact wrench is provided that can mitigate vibrations in the axial direction without reducing the rotary impact force of hammers. The hammers are composed of a primary hammer (6) fitted to the outer circumference of a spindle (5) and a cylindrical secondary hammer (7) that is disposed so as to cover the primary hammer (6) and that rotates together with the primary hammer (6). Furthermore, the secondary hammer (7) is held by a axis holding means in a state in which the rotational axis of the secondary hammer (7) is coincident with the axis of the spindle (5) in order to prevent precession movement. With the use of the hammer configuration of the present invention, the mass of the primary hammer (6) can be decreased compared to that of the secondary hammer (7), and therefore it is possible to mitigate vibrations in the axial direction while maintaining the rotary impact force. |
