| 摘要 |
A water pump for circulating the cooling water of an internal combustion engine, facilitates the formation of the water passage connecting the water pump to the cooling water passage in the cylinder block and can reduce manufacturing costs thereof. A water pump for circulating the cooling water of an internal combustion engine is connected to one end of a cam shaft for a valve system arranged in a cylinder head and is driven by the cam shaft. A delivery port of the water pump is extended near to a cooling water supply port formed in the side wall of a cylinder block and is connected to a cooling water passage in the cylinder block. The delivery poll of the water pump is extended to a position directly opposite to the cooling water supply port, and is connected to the cooling water supply port with a connection pipe. A mounting structure of a camshaft is capable of applying high speed rotation by shortening a length of push rods and also capable of facilitating maintenance such as replacement of cams. In an overhead valve type internal combustion engine, a camshaft is located and mounted in space surrounded by an upper portion of a cylinder and cylinder head.
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