| 摘要 |
An insulated pre-combustion chamber of an internal combustion engine in which a piston is disposed in a cylinder for reciprocal movement relative to the cylinder. A cylinder head is provided over the cylinder and piston to form a main combustion chamber and the pre-combustion chamber is located in the cylinder head above the main combustion chamber. The pre-combustion chamber includes a pair of housing members and a retainer member all rigidly interconnected so as to provide an annular cavity between the retainer member and the upper housing member. Transfer passages are formed in the lower housing member for connecting the pre-combustion chamber with the main combustion chamber, and the cavity serves as an insulation area which cooperates with a separate and independent insulation member located between the lower housing member and the cylinder head for reducing the heat loss from the pre-combustion chamber.
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