GAS SUPPLY PUMP FOR SHIP DUAL FUEL ENGINE

A gas supply pump for a ship dual fuel engine is described. The gas supply pump includes a rotatable camshaft, a plurality of cam noses arranged at regular intervals along a lengthwise direction of the camshaft, a cam roller in close contact with each cam nose, a drive shaft and a piston adjacent to each other on one side of the cam roller, a liquefied gas compression device to compress and discharge liquefied gas by a linear reciprocating motion of the piston, a coupling case at a coupled part of the drive shaft and the piston, a rack member connected to the drive shaft, or connected and fixed to both the drive shaft and the piston in an internal space of the coupling case, and a pinion engaged with a teeth-shaped rack on an outer surface of the rack member.