Cylinder head

Abstract

Abstract PURPOSE:To prevent breakage by casting a fuel combustion chamber surface made of a first ceramic material having a small thermal expansion coefficient and a large Young modulus and a second ceramic material having a large expansion coefficient and a small Young's modulus, integrally with a cylinder head body. CONSTITUTION:A combustion chamber surface including a fuel injection valve hole 11 between two valve seats 7, 9 is formed with an inner plate 13 made of a first ceramic material such as silicon nitride having a small thermal expan sion coefficient, a high thermal conductivity and a large Young's modulus. Meanwhile, a combustion chamber surface other than that between the valve seats 7, 9 is formed with an outer plate 15 which is made of a second ceramic material such as aluminum titanate having a large expansion coefficient, a low thermal conductivity and a small Young modulus. Further, these inner and outer plates 13, 15 are cast integrally with a cylinder head body so as to obtain a cylinder head 1.

Inventors

• 👤 Shuji Kimura
• 👤 修二 木村

Bibliographic Details