Structure of the combination chamber of internal combustion engines

Claim 2

The structure of a combustion chamber of an internal combustion engine comprising a cylinder head provided with an intake port and an intake poppet valve which selectively opens or closes said intake port, wherein a part of the inner surface of the cylinder head forming a peripheral portion of the intake port is provided with a dam portion adapted to cooperate with the peripheral edge portion of said intake valve when said valve is in its open position so as to define an arcuate channel extending along said peripheral edge portion, said arcuate channel having a gradually increasing cross sectional area from one end toward the other end thereof.

Claim 3

The structure according to claim 1, wherein said arcuate channel opens to the combustion chamber at said other end thereof in a direction substantially tangential to the peripheral wall of the combustion chamber.

Claim 4

The structure according to claim 1, wherein said arcuate channel is substantially blocked at said one end thereof by a projection formed on a part of the inner surface of the cylinder head near the inlet to the intake port.

Claim 5

The structure according to claim 1, wherein the combustion chamber is also provided with an exhaust port, said intake port and said exhaust port opening at a bottom portion of a relatively shallow cavity formed in a part of said cylinder head, a wall portion of said arcuate channel being defined by a wall defining the peripheral portion of said cavity, a portion of said wall which defines the peripheral portion of said cavity being cut off to provide a relief portion defined by a surface smoothly joining the bottom wall of said cavity, and a spark plug positioned within said cavity.

Claim 6

The structure according to claim 4, wherein said cavity has a substantially C-shaped peripheral contour extending from said one end of said channel to said relief portion.

Claim 7

The structure of a combustion engine of an internal combustion engine which effectively utilizes an air/fuel ratio of about 22 to 25 thereby improving the efficiency of the engine and reducing the fuel consumption which comprises a cylinder head provided with an intake port having an intake valve which selectively opens and closes said intake port and an exhaust port having an exhaust valve wherein a part of the inner surface of the cylinder head forming a peripheral portion of the intake port is provided with a dam portion adapted to cooperate with the peripheral edge portion of said intake valve when said valve is in its open position so as to define an arcuate channel extending along said peripheral edge portion, said arcuate channel having a gradually increasing cross sectional area from one end toward the other end thereof and being substantially blocked at one end thereof by a projection formed on a part of the inner surface of the inner cylinder head near the inlet to the intake port, said arcuate channel opening to the combustion chamber at said other end thereof in a direction substantially tangential to the peripheral wall of the combustion chamber, and said exhaust port opening at a bottom portion of a relatively shallow cavity formed in a part of said cylinder head, a wall portion of said arcuate channel being defined by a wall defining the peripheral portion of said cavity, a portion of said wall which defines the peripheral portion of said cavity being cut off to provide a relief portion defined by a surface smoothly joining the bottom wall of said cavity, wherein said cavity has a substantially C-shape peripheral contour extending from one end of said channel to said relief portion, and a spark plug positioned within said cavity.

Claim 8

The structure of a combustion engine of an internal combustion engine which effectively utilizes an air/fuel ratio of about 22 to 25 thereby improving the efficiency of the engine and reducing the fuel consumption which comprises a cylinder head provided with an intake port having an intake valve which selectively opens and closes said intake port and an exhaust port having an exhaust valve wherein a part of the inner surface of the cylinder head forming a peripheral portion of the intake port is provided with a dam portion adapted to cooperate with the peripheral edge portion of said intake valve when said valve is in its open position so as to define an arcuate channel extending along said peripheral edge portion, said arcuate channel having a gradually increasing cross sectional area from one end toward the other end thereof and being substantially blocked at one end thereof by a projection formed on a part of the inner surface of the inner cylinder head near the inlet to the intake port, said arcuate channel opening to the combustion chamber at said other end thereof in a direction substantially tangential to the peripheral wall of the combustion chamber, and said exhaust port opening at a bottom portion of a relatively shallow cavity formed in a part of said cylinder head, a wall portion of said arcuate channel being defined by a wall defining the peripheral portion of said cavity, a portion of said wall which defines the peripheral portion of said cavity being cut off to provide a relief portion defined by a surface smoothly joining the bottom wall of said cavity, wherein said cavity has a substantially C-shape peripheral contour extending from one end of said channel to said relief portion, and a spark plug positioned within said cavity.