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:
Dec. 12, 2017
Filed:
Aug. 27, 2013
Citizen Finetech Miyota Co., Ltd., Kitasaku-gun, Nagano, JP;
Citizen Holdings Co., Ltd., Nishitokyo-shi, Tokyo, JP;
Kazuo Takahashi, Nagano, JP;
Takayuki Hayashi, Nagano, JP;
CITIZEN FINEDEVICE CO., LTD., Minamitsuru-Gun, Yamanashi, JP;
CITIZEN WATCH CO., LTD., Nishitokyo-Shi, Tokyo, JP;
Abstract
A combustion pressure sensor is formed of a ring-shaped cylindrical body. The combustion pressure sensor detects combustion pressure in a combustion chamber of an engine by being attached to an outer periphery of a tip of a functional component attached to the combustion chamber. The cylindrical body forms sealed space sealed with a ring-shaped diaphragm on one side and with a ring-shaped support member on an opposite side. The sealed space is defined by an external cylindrical member and an internal cylindrical member coaxial with each other. The diaphragm has a ring-shaped pressure receiving part formed on a side near the combustion chamber to receive pressure from outside and a ring-shaped transmitting part formed on a rear surface of the diaphragm. A pressure transmitting member and a pressure detecting element are provided in the sealed space. Tight abutting contact is formed between the transmitting part of the diaphragm and the pressure transmitting member, between the pressure transmitting member and the pressure detecting element, and between the pressure detecting element and the support member.