Importance

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Abstract

A plunger pump has a plunger adapted to slide in the axial direction and rotate by a combination of worm and worm wheel. A cylindrical pump body has an axial extension at one free end through which a control pin extends upwardly at a right angle relative to the extension, while the plunger carried on the pump in a cantilever fashion has an inclined end face cam, an adjustment cam and a worm wheel on the same side as the axial extension. The worm wheel meshes with a worm directly connected to a crankshaft of an engine and the crankshaft is not held on the pump body. As the crankshaft is rotated, the plunger is caused to rotate by meshing engagement of the worm and the worm wheel and at the same time slide in the pump body by contact of the end face cam with the control pin whereby liquid held in the pump chamber is discharged from the delivery port. The axial extension is formed with plural pairs of stepped surfaces and by selecting one pair of the stepped surfaces and exchanging the subplunger with other one, a volume of the pump chamber can be changed as required, since the control pin has a tapered part at the upper part thereof and the latter contacts the adjustment cam on the plunger.

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First Claim