Internal combustion engine provided with pre-combustion chamber

Claim 2

In an internal combustion engine provided with a main combustion chamber which is defined in the upper portion of a cylinder volume and provided with an intake valve for introducing a lean mixture into said main combustion chamber and an exhaust valve and a pre-combustion chamber free of an intake valve, said main combustion chamber being communicated by a passage with said pre-combustion chamber, an ignition plug provided in said engine, said ignition plug having a spark gap, the improvement which comprises; having said spark gap located within said passage, the central axis of the passage being off-set relative to the longitudinal central axis of the pre-combustion chamber so that the longitudinal central axis of the pre-combustion chamber is asymmetrical with respect to the longitudinal central axis of the passage, whereby said lean mixture pressed into said pre-combustion chamber through said passage is ignited by said spark plug, and blowing as a torch flame from said pre-combustion chamber into said main combustion chamber.

Claim 3

An internal combustion engine as set forth in claim 1, having the further improvement which comprises; the positioning of said ignition plug so the angle formed by the longitudinal axis of said ignition plug and the longitudinal axis of said passage is larger than 0° but not larger than 90°.

Claim 4

An internal combustion engine provided with at least one semi-spherical main combustion chamber defined immediately above a cylinder volume and provided with an intake valve for introducing a lean mixture into said main combustion chamber and an exhaust valve, said intake and exhaust valves being arranged in direction to form a substantial V pattern, wherein at least one pre-combustion chamber having no intake valve is located above said main combustion chamber and off-setted to the axis of said cylinder said pre-combustion chamber being communicated by a passage with said main combustion chamber, and wherein an ignition plug, with a spark gap thereof located within said passage, is provided to be substantially parallel to the axis of said cylinder, the longitudinal central axis of the passage being off-set relative to the longitudinal central axis of the precombustion chamber so that the longitudinal central axis of the pre-combustion chamber is asymmetrical with respect to the longitudinal central axis of the passage, whereby said lean mixture pressed into said pre-combustion chamber through said passage is ignited by said spark plug, and blowing as a torch flame from said pre-combustion chamber into said main combustion chamber.

Claim 5

An internal combustion engine provided with at least one semi-spherical main combustion chamber defined immediately above a cylinder volume and provided with an intake valve for introducing a lean mixture into said main combustion chamber and an exhaust valve, said intake and exhaust valves being arranged in direction to form a substantial V pattern, wherein at least one pre-combustion chamber having no intake valve is located above said main combustion chamber and off-setted to the axis of said cylinder said pre-combustion chamber being communicated by a passage with said main combustion chamber, and wherein an ignition plug, with a spark gap thereof located within said passage, is provided to be substantially parallel to the axis of said cylinder, the longitudinal central axis of the passage being off-set relative to the longitudinal central axis of the precombustion chamber so that the longitudinal central axis of the pre-combustion chamber is asymmetrical with respect to the longitudinal central axis of the passage, whereby said lean mixture pressed into said pre-combustion chamber through said passage is ignited by said spark plug, and blowing as a torch flame from said pre-combustion chamber into said main combustion chamber.