Throttle valve

Details Throttle valve Throttle valve

F - Mech Eng,Light,Heat,Weapons

02

M

123/88

F02M 19/00 (2006.01) F02D 9/10 (2006.01)

Patent

CA 1191754

ABSTRACT OF THE DISCLOSURE A throttle valve disposed within the intake bore of an internal combustion engine. The valve thickness is large, preferably more than 1.5 mm and less than about 1/10 of the valve diameter. The full closed angle of the valve is less than 5° . The circumferential edge of the valve has a roundness having a radius less than about five times as large as the valve thickness. When the valve is fully closed, there is a clearance L of about 1/10,000 to 5/l,000 of the intake bore diameter between the circumferential edge of the valve and the inner surface of the intake bore. The valve reduces the degree of air flow change at small opening angles of the valve as in the idling or low-speed operation of the engine so as to reduce the change of air flow caused by the change of the valve opening. Thus, an optimum air-fuel ratio in a range of small opening angles of the valve can be easily maintained.

403462

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