Patent ID: 9011111
Filing Date: 2015-04-21
Classification: F04B

Abstract:
1. A mud pump, comprising: a frame; at least one pump module disposed on the frame, the at least one pump module comprising an inlet port and an outlet port; a pump shaft rotatably disposed in the frame for receiving rotational power from a motor, the pump shaft having at least one substantially circular eccentric lobe disposed thereon, the centre of the at least one eccentric lobe displaced or offset from the longitudinal axis of the pump shaft; at least one slide disposed in the frame, the at least one slide operatively configured to move linearly side-to-side within the frame, the at least one slide further comprising a pair of substantially parallel spaced-apart sidewalls; at least one piston rod assembly operatively coupling the at least one slide to the at least one pump module; and a connecting rod comprising first and second ends operatively coupling the pump shaft to the at least one slide, the connecting rod disposed between the sidewalls of the at least one slide such that the connecting rod is pivotable relative to the sidewalls, the first end rotatably disposed on the at least one eccentric lobe, the second end rotatably pinned to both sidewalls of the at least one slide whereby rotation of the pump shaft causes the slide to move side-to-side that, in turn, causes the at least one piston rod assembly to operate the at least one pump module.