Patent ID: 6223971
Filing Date: 2001-05-01
Classification: B23K,F16H,H02K

Abstract:
A driving unit of a welding equipment provided with a pressure application shaft that is driven by a motor comprising:a rotary shaft of the motor formed of a hollow shaft;a screw shaft fixed to the rotary shaft and positioned inside the rotary shaft;a nut fixed to the pressure application shaft, said nut being screw engaged with a screw provided on the screw shaft, wherein the rotary shaft of the motor is substantially coaxially positioned with the screw shaft;wherein outer diameters of the nut and pressure application shaft are respectively smaller than an inner diameter of the rotary shaft, and the outer diameter of the nut is the same as or smaller than the outer diameter of the pressure application shaft so that a direct moving guide part is formed by the nut and the pressure application shaft; andwherein the direct moving guide part formed by the nut and the pressure application shaft is movable on an inner annular peripheral surface of the rotary shaft, and a rotary motion of the rotary shaft of the motor is converted into a reciprocating motion of the pressure application shaft via the screw shaft and the nut.