| 摘要 |
A hydraulically powered long stroke pumping unit including support means with a first pump unit mounted on said support means. The first pumping unit includes a first pump cylinder and first piston means reciprocable in said first pump cylinder and a piston rod extending outwardly from said first pump cylinder. A second pump unit is mounted on the support means in opposed aligned, spaced relationship with said first pump unit, and the second pump unit includes a second pump cylinder and a second piston means reciprocable in the second pump cylinder. The second piston means includes a piston rod extending outwardly from the second pump cylinder toward the piston rod of the first pump cylinder. The piston rods extend toward one another along a common central longitudinal axis, and a pump drive bar is connected to the outermost ends of the piston rods. A hydraulic drive means is connected to selectively and positively drive the pump drive bar in opposite directions in a single plane.
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