Patent ID: 8733332

Claim:
A general-purpose gasoline engine, comprising a cylinder block, a cylinder head main body ( 1 ), and an intake passage ( 12 ) and an exhaust passage ( 11 ) arranged on the cylinder head main body ( 1 ); an intake valve ( 5 ) is arranged on the cylinder head main body ( 1 ) correspondingly to the intake passage ( 12 ), an exhaust valve ( 9 ) is arranged correspondingly to the exhaust passage ( 11 ), the intake valve ( 5 ) is correspondingly provided with an intake rocker arm ( 8 ) and an intake push rod, the exhaust valve ( 9 ) is correspondingly provided with an exhaust rocker arm ( 2 ) and an exhaust push rod, and a combustion chamber surface ( 13 ) is formed on the inner side of the cylinder head main body ( 1 ); wherein: the combustion chamber surface ( 13 ) is of a spherical structure or an arch surface formed of smooth curves; a part of the combustion chamber surface ( 13 ) between the intake valve ( 5 ) and the exhaust valve ( 9 ) forms a nose bridge region ( 14 ), and a through air-cooling passage ( 10 ) is arranged on the cylinder head main body ( 1 ) on an outer side of the nose bridge region ( 14 ); and a ribbed cooling bridge ( 10 a ) is integrated with the cylinder head main body ( 1 ) in the through air-cooling passage ( 10 ), the ribbed cooling bridge ( 10 a ) is arranged in the through air-cooling passage ( 10 ) along a longitudinal direction and vertical to a mounting plane of the cylinder head main body ( 1 ), and the ribbed cooling bridge ( 10 a ) connects a top surface of the air-cooling passage ( 10 ) with a bottom surface of the air-cooling passage ( 10 ).