Patent ID: 9689506
Date: 2017-06-27
CPC Classifications: B21K,B23P,F01L,F16K,Y10T

Claim:
1. A hollow poppet valve the poppet valve comprising: a valve head and a valve stem integral at one end thereof with the valve head, the poppet valve formed with an internal cavity that extends from within the valve head into the valve stem and is charged with a coolant together with an inert gas, wherein the internal cavity has a diametrically large generally disk shaped cavity in the valve head and a diametrically small linear straight cavity in the valve stem in communication with the valve head cavity, wherein only a bottom fringe portion of the valve head cavity is extended radially outwardly and circumferentially, forming a flange shape cavity at the bottom fringe portion of the valve head cavity, the flange shape cavity communicating with the valve head cavity, wherein the valve head cavity is configured in the shape of a generally truncated circular cone whose longitudinal cross section is a substantial trapezoid and whose periphery is either an excurved skirt-like outer periphery or a tapered periphery parallel with the outer periphery of the valve head, wherein a peripheral region of the valve head cavity around an open end of the valve stem cavity communicated with the valve head cavity is a flat plane perpendicular to the axis of the valve, and, serves as a ceiling of the valve head cavity, wherein the coolant is charged in the valve head cavity and the valve stem cavity, and wherein a vertical circulatory flow of coolant is generated in the coolant in the valve head cavity along the axis of the valve while a turbulent flow of coolant is generated in the coolant in the valve stem cavity, during a reciprocal motion of the valve.