Hydropneumatic drive unit for driving spot-welding tongs comprises a drive cylinder with hydraulic medium in a piston chamber that is interconnected in a pressure-tight and fluidic manner to a piston chamber of a driven cylinder

摘要

Hydropneumatic drive unit (01) comprises a drive cylinder (02) and a driven cylinder (04). The hydraulic medium (08) in the drive cylinder is held in a first piston chamber (06a, 06b) and in the driven cylinder in a second piston chamber (07). The first and second piston chambers are interconnected by a connecting channel (09) in a pressure-tight and fluidic manner. Preferred Features: The hydraulic active surface of the working piston (03) in the drive cylinder is greater than the hydraulic active surface of the working piston (05) in the driven cylinder.