Apparatus for supplying rich air/fuel mixture in an internal combustion engine

In an internal combustion engine utilizing a main combustion chamber in a cylinder head, an air/fuel mixture passage for conducting relatively large amounts of a relatively lean air/fuel mixture to an intake to the main combustion chamber and an intake valve for controlling the flow of the air/fuel mixture into the main combustion chamber, the improvement comprising:

• an auxiliary combustion chamber at least partially embedded in the cylinder head adjacent said air/fuel mixture intake,
• an unvalved inlet port for conducting air/fuel mixture into the auxiliary combustion chamber,
• said intake valve having a back surface for deflecting a portion of said air/fuel mixture toward said inlet port,
• an auxiliary passage in said cylinder head opening into the wall of said lean air/fuel passage and a short tube communicating with said auxiliary passage for supplying a relatively rich air/fuel mixture in relatively small, heated amounts to said intake, said tube terminating at said back surface of said valve, the wall of the outlet end of said tube being reduced in thickness for adapting itself by deformation to recession of the intake valve due to wear.

An apparatus for supplying a rich air/fuel mixture for an internal combustion engine comprising:

• a. a cylinder, a piston, a cylinder head associated with said cylinder and piston to define a combustion chamber;
• b. an intake passage for supplying a lean air/fuel mixture to the combustion chamber;
• c. an intake valve for controlling the flow of the lean air/fuel mixture into the combustion chamber;
• d. an ignition spark plug provided in the combustion chamber for igniting the air/fuel mixture;
• and
• e. a tube for supplying the rich air/fuel mixture, said tube terminating at the back surface of the intake valve when said valve is closed, and the wall of the outlet end of said tube being reduced in thickness for adapting itself by deformation to recession of the intake valve due to wear.