Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1989-08-24
1991-02-05
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74467, 417374, F16H 2118, F16H 5704
Patent
active
049894692
ABSTRACT:
An eccentric gear pump for use in pumping a variety of fluids. The pump has conventional plungers reciprocably positioned in a cylinder and includes a drive case with a rotatable drive shaft therein. The driven shaft is connected eccentrically to drive gears in a plurality of gear assemblies. Each gear assembly also includes a driven gear which has a yoke assembly eccentrically connected thereto. The yoke assembly is connected to a corresponding plunger. Rotation of the drive gear results in rotation of the driven gear which in turn causes reciprocation of the yoke assembly and plunger. Cam rollers are attached to opposite sides of the driven gear, and the cam rollers ride closely within a cam groove in a cam track on opposite sides of each driven gear. The interaction of the cam roller and the cam groove limits movement of the yoke assembly and piston to substantially purely reciprocal motion with respect to the drive case. Each gear assembly includes a pressure lubricated gear case.
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Halliburton Services Sales & Service Catalog No. 43, published in 1985, pp. 2414, 2415 and 2418-2421.
Duzan James P.
Halliburton Company
Herrmann Allan D.
Kennedy Neal R.
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