Hollow poppet valve
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United States of America Patent
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Apr 4, 2017
Grant Date -
Dec 10, 2015
app pub date -
Mar 14, 2013
filing date -
Mar 14, 2013
priority date (Note) -
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Abstract
A hollow poppet valve (10) has an internal cavity (S) which comprises a diametrically large valve head cavity (S1) formed in a valve head (14) and a diametrically small stem cavity (S2) formed in a stem (12) in communication with the valve head cavity (S1). The stem cavity has a diametrically larger first portion (S21) near the end of the stem and a diametrically smaller second portion (S22) near the valve head. A step (17) is formed at the boundary of the first and the second portion of the stem cavity (S2). The internal cavity is loaded with a coolant to a level above the step, together with an inert gas. In response to a reciprocal motion of the valve, turbulent flows of coolant (F9) are created in the neighborhood of the step (17), facilitating active stirring of the coolant (19) in the cavity (S).
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