| 摘要 |
A welding gun is provided in which moisture does not penetrate inside of a motor housing due to preventing the inside of the motor housing from becoming negative pressure. The welding gun includes a feed screw mechanism (40) that is coupled to a servo motor (10) and has a hollow rod (43) that reciprocally moves in a predetermined direction by way of torque applied by the servo motor (10), and a moveable electrode tip (62) that is connected to a leading end portion of the hollow rod (43) and opens and closes relative to a fixed electrode tip (61) according to the reciprocal movement of the hollow rod (43). The servo motor 10 has a motor housing (20) in which a motor housing hollow part (25) accommodating a portion of the hollow rod (43) to be reciprocally moveable is formed. A vent (21b) that ventilates the motor housing hollow part (25) with ambient air is formed in the motor housing (20).
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