Cooling system for heat insulating engine

F - Mech Eng,Light,Heat,Weapons – 02 – B

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F02B 75/18 (2006.01) F01P 3/02 (2006.01) F01P 9/00 (2006.01) F02B 23/06 (2006.01) F02F 1/02 (2006.01) F02F 1/38 (2006.01) F02F 7/00 (2006.01) F02B 3/06 (2006.01) F02B 77/11 (2006.01) F02F 1/24 (2006.01)

Patent

CA 1330642

ABSTRACT OF THE DISCLOSURE: The upper parts of the cylinder liners and the cylinder head are formed integral in one piece, and a water jacket is provided around the outer peripheries of the upper parts of the cylinder walls, with no water jacket provided to the cylinder body. This eliminates the use of the core for the water jacket in molding the cylinder body, which in turn reduces the engine weight, brings about a significant cost reduction and makes machining operations easy. Because the piston head is made of a heat insulating material and a water jacket is not provided to the cylinder body, the heat is prevented from flowing down to the cylinder liners. Furthermore, the cylinder liners are made of a ceramic material to improve an anti-galling characteristic during sliding motions at high temperatures. Also, since the water jacket is provided only to the cylinder head, the water jacket can be made simple and small in structure, reducing the cooling water flow resistance. This in turn permits the use of a small motor-powered water pump that can be controlled independently of the engine conditions. Moreover, since the cylinder body has no water jacket, there is a greater freedom in designing the cylinder body, which makes it possible to form reinforcement ribs on the cylinder body to increase its rigidity and thereby reduce vibrations and noise.

571572

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