Drive head for rotary driven rod linkage for borehole pump

摘要

The drive head includes a direction lock (6) which connects the sleeve (30) with torque transfer to the recoil brake only during return movement. The recoil brake has a hydraulic circuit with pump (70) and throttle point (90). The pump and throttle point are set inside the housing (12) and are fed by oil used to lubricate the gearbox (50). The gearbox has a counter-shaft (48) connected to the pump through the direction lock and to the sleeve for transferring torque. The counter shaft is set axially parallel with the sleeve and coaxial with the pump.