Gas supply pump for ship dual fuel engine

A gas supply pump for a ship dual fuel engine, comprising:

• a rotatable camshaft, the rotatable camshaft comprising a plurality of cam noses arranged eccentric from a center of the rotatable camshaft at regular intervals along a lengthwise direction of the rotatable camshaft;
• and
• a plurality of liquefied gas compression devices arranged at regular intervals along the lengthwise direction of the rotatable camshaft, wherein each liquefied gas compression device of the plurality of liquefied gas compression devices is configured to compress and discharge liquefied gas, and wherein each liquefied gas compression device of the plurality of liquefied gas compression devices comprises:
• a cam roller configured to closely contact a respective cam nose of the plurality of cam noses;
• a drive shaft on one side of the cam roller;
• a piston adjacent to the drive shaft on the one side of the cam roller;
• an integral connection member that integrally connects the cam roller and the drive shaft, wherein the cam roller is seated at one end of the integral connection member and the drive shaft is mounted at an other end of the integral connection member;
• a compression spring disposed around the drive shaft and fixed to an inner side of the integral connection member;
• and
• a cam roller-drive shaft case on an outer side of the integral connection member to protect the integral connection member and to guide movement of the integral connection member, wherein the cam roller-drive shaft case comprises, on one side, a cutoff bolt through-hole into which a cutoff bolt is configured to be inserted and passed through, and the integral connection member comprises, on one side, a cutoff bolt insertion groove, into which the cutoff bolt is configured to be inserted to a predetermined depth, wherein:
• each of the plurality of liquefied gas compression devices is configured such that:
• the piston is compressed when the rotatable camshaft rotates the respective cam nose in a compression direction of the piston,
• the piston is decompressed when the rotatable camshaft rotates the respective cam nose in a decompression direction of the piston,
• the cam roller is selectively spaced apart from the respective cam nose and, when the cam roller and the respective cam nose are spaced apart from each other, a rotational driving force of the respective came nose is not transmitted to the piston,
• the cam roller and the integral connection member are configured such that, when the rotatable camshaft rotates with the cam roller in close contact with the respective cam nose, the cam roller and the integral connection member make a linear reciprocating motion together, and
• the respective cam nose and the cam roller are configured to be spaced apart from each other when the cutoff bolt is inserted into the cutoff bolt insertion groove through the cutoff bolt through-hole.