The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Oct. 02, 2012
Nittan Valve Co., Ltd., Hadano-shi, Kanagawa, JP;
Hiroki Onuma, Hadano, JP;
Jin Hasegawa, Hadano, JP;
NITTAN VALVE CO., LTD., Hadano-shi, JP;
Abstract
To provide a hollow poppet valve having an improved heat reduction effect. In a hollow poppet valve () having a valve head () and a stem () integral with the valve head (), the hollow poppet valve () is formed with an internal cavity S that extends in the valve head () and the stem (). The internal cavity S is charged with a coolant () and an inert gas. The internal cavity S has a generally disk-shape internal cavity Sand an internal stem cavity Sformed in the stem () and connected to the internal valve head cavity Sat a right angle. During a reciprocal motion of the valve (), a vertical convective flow of coolant () along the axis L of the valve () is established at least in the internal valve head cavity S, thereby enhancing its heat reduction effect.