Resistance spot welder

• Main Authors: IWAMOTO, YOSHIAKI, MURAI, TOSHIO
• Format: Patent
• Language: English; French; German
• Published: 04.09.2013
• Subjects: BLASTING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM

A resistance spot welder includes: a motor (3), having a shaft (15); a cylindrical casing (7); a hollow guide rod (6), inserted into the casing, and adapted to be moved linearly for moving a first electrode tip E1 facing a second electrode tip E2 provided at a gun arm (8); a ball nut (5), fixed in an inner circumference of the guide rod; a ball screw (4), fitted through the ball nut; a coupling (12), including a first fastening portion (17) into which the shaft (15) of the motor is inserted and a second fastening portion (16) into which the ball screw (4) is inserted and which is opposite to the first fastening portion (17); and a bearing (19), fitted between an outer circumference of the first fastening portion (17) and an inner circumference of the casing (7). The gun arm (8) has a piping groove (41) into which a cooling tube (40) is fitted, the cooling tube (40) having a coating cover made of a refractory rubber material or of a refractory synthetic resin.