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1. (WO2015118690) HOLLOW POPPET VALVE

Pub. No.:    WO/2015/118690    International Application No.:    PCT/JP2014/053086
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Tue Feb 11 00:59:59 CET 2014
IPC: F01L 3/20
F01L 3/02
F01L 3/14
Applicants: NITTAN VALVE CO., LTD.
日鍛バルブ株式会社
Inventors: TSUNEISHI Osamu
常石 摂
INOUE Masaaki
井上 雅章
Title: HOLLOW POPPET VALVE
Abstract:
The relative value of a thermal insulation effect and a heat drawing effect are adjusted and maximum combustion efficiency achieved by using a poppet valve using a refrigerant. A heat-insulation space (S1) separated by a partition wall (15) and a cooling section (S2) having a cooling material (19) filled therein are formed from inside the head section (14) of the hollow poppet valve (10) across to a shaft section (12). A suitable thermal insulation effect and a suitable heat drawing effect can be obtained by appropriately setting the installation position and vertical length of the partition wall (15) in accordance with the vehicle, etc., in which the poppet valve is used. In addition, the mechanical or thermal strength of the poppet valve having the heat-insulation space (S1) and a cooling section (S2) formed therein is improved as a result of said partition wall (15).