Precombustion chamber for gas engine

A precombustion chamber structure for a gas engine, comprising:

• a main body having
• a first hollow space formed in a central portion of the main body in a longitudinal direction, and
• a second hollow space formed in a side portion of the main body in parallel with the first hollow space;
• a water jacket mounted to a bottom of the main body and having
• a third hollow space formed in a central portion of the water jacket in a longitudinal direction and connected with the first hollow space, and
• a gas supply passage formed in a side portion of the water jacket and extending from a top portion to a bottom portion of the water jacket, the gas supply passage being connected with the third hollow space;
• a precombustion chamber tip mounted to a bottom of the water jacket and having a precombustion chamber formed in a center portion thereof;
• a tool insert groove formed on an outer surface of the precombustion chamber tip in a junction area between the precombustion chamber tip and the water jacket along a periphery of the precombustion chamber tip such that when the precombustion chamber tip is mounted to the water jacket, the tool insert groove forms a recessed space by the outer surface of the precombustion chamber tip and an outer portion of the bottom of the water jacket, wherein a tool is inserted into the recessed space to disassemble the precombustion chamber tip from the water jacket;
• a spark plug installed in the first and third hollow spaces and igniting fuel gas injected into the precombustion chamber, the fuel gas ignited by the spark plug being supplied into a main combustion chamber;
• a first O-ring provided between a bottom surface of the main body and a top surface of the water jacket and surrounding the first and third spaces for maintaining airtightness of the first and third spaces in which the spark plug is installed;
• and
• a second O-ring provided between the bottom surface of the main body and the top surface of the water jacket and surrounding the second space for maintaining airtightness of the second space in which a check valve is installed.