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US 4,957,081 AGranted
Combustion chamber of an engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsToshio Ito, Toshio Tanahashi
Life of this patent
Estimating the term…
Abstract
A two-stroke engine having an intake valve and an exhaust valve which are arranged on the cylinder head. A masking wall is formed on the inner wall of the cylinder head to mask the valve opening between the valve seat and the peripheral portion of the intake valve, which is located on the exhaust valve side, for the entire time for which the intake valve is open. The valve seat and the masking wall are formed by a built-up layer which is built up on the wall of the cylinder head and machined.
Claims21
An engine comprising:
- an engine body including a cylinder head having an inner wall;
- a piston reciprocally movable in said engine body, the inner wall of said cylinder head and a top face of said piston defining a combustion chamber therebetween;
- valve means arranged on the inner wall of said cylinder head;
- and
- a masking wall formed on the inner wall of said cylinder head to mask a part of a valve opening formed between a valve seat and a peripheral portion of said valve means, said valve seat and said masking wall being formed by a built-up layer which is built up on said cylinder and is machined, said built-up layer comprising a copper-based metallic material containing nickel, iron, and phosphorus, said metallic material being different from that of said cylinder head.
2 more elements
Dependencies are inferred from the claim text.