Air-cooling cylinder head of gasoline engine and gasoline engine having the same

Abstract

The invention discloses an air-cooling cylinder head of a gasoline engine and a gasoline engine. The air-cooling cylinder head of a gasoline engine comprises a cylinder head main body ( 1 ), and an intake passage ( 3 ), an exhaust passage ( 2 ) and a spark plug mounting hole ( 6 ) arranged in the cylinder head main body ( 1 ), a plurality of cooling fins ( 4 ) is arranged on the outer surface of the cylinder head main body ( 1 ), a combustion chamber surface ( 5 ) is formed on the inner side of the cylinder head main body ( 1 ), a longitudinally through air-cooling passage I ( 8 ) is arranged on the same side of the cylinder head main body ( 1 ) as the intake passage ( 3 ) and the exhaust passage ( 2 ), a transversally through air-cooling passage II ( 7 ) is arranged between the intake passage ( 3 ) and the exhaust passage ( 2 ), and both the longitudinally through air-cooling passage I ( 8 ) and the transversally through air-cooling passage II ( 7 ) are kept away from function holes on the cylinder head main body ( 1 ). In the technical solution of the invention, cooling air flows through the outer surface of the combustion chamber wall from different directions to sufficiently decrease the temperature of the combustion chamber, so that the cylinder head has excellent cooling efficiency, and the power of the gasoline engine is increased.

1 . An air-cooling cylinder head of a gasoline engine, comprising a cylinder head main body, and an intake passage, an exhaust passage and a spark plug mounting hole arranged in the cylinder head main body, a plurality of cooling fins is arranged on the outer surface of the cylinder head main body, and a combustion chamber surface is formed on the inner side of the cylinder head main body, wherein a longitudinally through air-cooling passage I is arranged on the same side of the cylinder head main body as the intake passage and the exhaust passage, a transversally through air-cooling passage II is arranged between the intake passage and the exhaust passage, and both the longitudinally through air-cooling passage I and the transversally through air-cooling passage II are kept away from function holes on the cylinder head main body. 
     
     
         2 . The air-cooling cylinder head of a gasoline engine according to  claim 1 , wherein the axis of the intake passage and the axis of the exhaust passage are in a coplane, the air-cooling passage I is parallel to the coplane of the axis of the intake passage and the axis of the exhaust passage, the air-cooling passage I and the spark plug mounting hole are respectively located on two sides of the coplane of the axis of the intake passage and the axis of the exhaust passage, the air-cooling passage II is vertical to the coplane of the axis of the intake passage and the axis of the exhaust passage. 
     
     
         3 . The air-cooling cylinder head of a gasoline engine according to  claim 2 , wherein the cooling fins extends into the air-cooling passage I to form a cooling bridge, and the air-cooling passage I is separated into a structure with a plurality of parallel and longitudinal passages by the cooling bridge. 
     
     
         4 . The air-cooling cylinder head of a gasoline engine according to  claim 3 , wherein a through spark plug air-cooling passage is arranged on the same side of the cylinder head main body as the spark plug mounting hole. 
     
     
         5 . The air-cooling cylinder head of a gasoline engine according to  claim 4 , wherein the cooling fins on the cylinder head main body extends to the outer wall of the exhaust passage. 
     
     
         6 . The air-cooling cylinder head of a gasoline engine according to  claim 1 , wherein the combustion chamber surface is of a complexly spherical structure comprising a sphere I (a), a smooth curve (b) and a sphere II (c) in turn from the bottom to the top, and the radius of the sphere II (c) is larger than that of the sphere I (a); and the sphere I (a) and the sphere II (c) are in smooth transition through the smooth curve (b). 
     
     
         7 . The air-cooling cylinder head of a gasoline engine according to  claim 6 , wherein an intake valve is arranged on the cylinder head main body  correspondingly to the intake passage, an exhaust valve is arranged correspondingly to the exhaust passage, the intake valve is oblique to the intake passage side from the bottom to the top, and the exhaust valve is oblique to the exhaust passage side from the bottom to the top. 
     
     
         8 . The air-cooling cylinder head of a gasoline engine according to  claim 7 , wherein the intake valve and the exhaust valve are respectively provided with rocker arms, rocker arm bases are respectively arranged on the cylinder head main body correspondingly to the corresponding rocker arms, the rocker arms are fixedly provided with corresponding rocker arm shafts, the rocker arm shafts are arranged on the corresponding rocker arm bases  in single freedom in a manner of capable of rotating around respective axes, the rocker arm shafts are internally and obliquely arranged towards the top in the radial direction with respect to the mounting surface of the cylinder head main body, and the oblique angle of the corresponding rocker arm shafts with respect to the mounting surface of the cylinder head main body is respectively and correspondingly identical to the oblique angles of the intake valve and the exhaust valve with respect to the axis of the cylinder head main body; and the rocker arms form a lever structure using the corresponding rocker arm shafts as the fulcrums. 
     
     
         9 . The air-cooling cylinder head of a gasoline engine according to  claim 8 , wherein the rocker arm bases are of structures with openings, the two ends of the rocker arm shafts are correspondingly inserted into the two sides of the openings of the corresponding rocker arm bases, and the rocker arm shafts fit with the corresponding rocker arm bases in a manner of capable of rotating around respective axes, and the rocker arms are located inside the openings of the corresponding rocker arm bases and fixedly arranged on the corresponding rocker arm shafts; the outward side of the opening structure of the rocker arm bases is a split bearing base structure comprising a gland and a base body, and the gland and the base body are detachably and fixedly connected with each other. 
     
     
         10 . The air-cooling cylinder head of a gasoline engine according to  claim 9 , wherein the axis of the intake valve and the axis of the exhaust valve  are respectively vertical to the tangent plane of the intersections point of the combustion chamber surface with the axis of the intake valve and the axis of the exhaust valve. 
     
     
         11 . The air-cooling cylinder head of a gasoline engine according to  claim 10 , wherein the part of the combustion chamber surface located between the intake valve and the exhaust valve forms a nose bridge region, and the width of the nose bridge region is above  8 mm on the combustion chamber surface. 
     
     
         12 . The air-cooling cylinder head of a gasoline engine according to  claim 11 , wherein the outer circle of a seat retainer of the intake valve and the outer circle of a seat retainer of the exhaust valve are tangent to the edge of the bottom of the combustion chamber surface; and the internal end of the seat retainer of the intake valve and the internal end of the seat retainer of the exhaust valve are matched with the shape of the combustion chamber surface. 
     
     
         13 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 1 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         14 . The air-cooling cylinder head of a gasoline engine according to  claim 5 , wherein the combustion chamber surface is of a complexly spherical structure comprising a sphere I (a), a smooth curve (b) and a sphere II (c) in turn from the bottom to the top, and the radius of the sphere II (c) is larger than that of the sphere I (a); and the sphere I (a) and the sphere II (c) are in smooth transition through the smooth curve (b). 
     
     
         15 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 2 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         16 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 3 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         17 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 4 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         18 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 5 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         19 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 6 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine. 
     
     
         20 . A gasoline engine having the air-cooling cylinder head of a gasoline engine according to  claim 8 , wherein the air-cooling cylinder head of a gasoline engine is arranged in the gasoline engine.