Pumpjack drive

Details Pumpjack drive Pumpjack drive

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 9/02 (2006.01)

Patent

CA 2117227

A pumpjack drive incorporating an overrunning clutch and a driving sheave which in turn drives a pumpjack for reciprocating an oil well rod string is disclosed. The driving sheave is subject to torque reversals due to the speeding up and slowing down of the rod string and the pumpjack counterweights. If the pumpjack counterweight attempts to accelerate the driving sheave faster then it is driven by the motor, the clutch disengages, preventing the motor from being accelerated beyond its synchronous speed. The drive includes an extension shaft which receives and turns with the motor shaft. The overrunning clutch is mounted on this extension shaft, which is in turn coupled to the driving sheave. The driving sheave is not drivingly connected to the motor shaft, and can thus rotate independently of the motor shaft when the clutch disengages.

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