| 摘要 |
In a hydraulic impulse screwdriver (1), a hammer (13) includes axial grooves (14) formed in the inner side wall thereof, and a spindle (11) includes V-shaped cam grooves (15) formed in the outer side wall thereof. A plurality of balls (16) are disposed in the space between the axial grooves and the opposing cam grooves. The screwdriver additionally includes a coil spring (17) for biasing the hammer (13) in a forward direction. The hammer is coupled to an anvil (19) by means of engaging recesses (18) of the hammer and engaging teeth (21) of the anvil so as to rotate integrally with the anvil. The anvil is firmly connected to a main body (24) of a hydraulic unit (23).
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