| 摘要 |
<p>A pump jack having a resiliently mounted speed reducer. The pump jack comprises a frame, a sampson post, and a walking beam pivotally mounted on the sampson post. Crank shaft bearings are securely mounted on the sampson post. A speed reducer is resiliently mounted to the sampson post and coupled to the crank shaft extending through the crank shaft bearings Thus, non-torsional forces are transferred to the sampson post, reducing wear on the speed reducer and obviating the necessity of a speed reducer of large size. This results in decreased power necessary to run the pump jack. This also allows the use of a single pitman rod configuration, which is subject to less wear than previous double pitman configurations.</p> |
