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:
Apr. 04, 2017
Filed:
Mar. 14, 2013
Nittan Valve Co., Ltd., Hadano-shi, Kanagawa, JP;
Osamu Tsuneishi, Kanagawa, JP;
Naoya Ishihara, Kanagawa, JP;
NITTAN VALVE CO., LTD., Hadano-Shi, JP;
Abstract
A hollow poppet valve () has an internal cavity (S) which comprises a diametrically large valve head cavity (S) formed in a valve head () and a diametrically small stem cavity (S) formed in a stem () in communication with the valve head cavity (S). The stem cavity has a diametrically larger first portion (S) near the end of the stem and a diametrically smaller second portion (S) near the valve head. A step () is formed at the boundary of the first and the second portion of the stem cavity (S). 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 (F) are created in the neighborhood of the step (), facilitating active stirring of the coolant () in the cavity (S).