公开(公告)号：US20240255382A1

公开(公告)日：2024-08-01

申请号：US18420018

申请日：2024-01-23

Applicant: CITIZEN FINEDEVICE CO., LTD. ,  CITIZEN WATCH CO., LTD.

Inventor： Yujiro NAKAMURA ,  Kazuo TAKAHASHI ,  Motoki OBATA ,  Hiroshi NAKAGAWA

IPC: G01M15/08

CPC classification number: G01M15/08

Abstract: A pressure detection device 1 includes: an enclosure assembly configured to be mounted in a communication hole in an internal combustion engine; a diaphragm head 32 provided at one end of the enclosure assembly and configured to receive pressure of combustion gas from the internal combustion engine; and a buffer member 80 located at the diaphragm head 32 and configured to supply the combustion gas to the diaphragm head 32 while reducing the temperature of the combustion gas. Female threads formed on a first buffer member 81 of the buffer member 80 and male threads formed on a second buffer member 82 of the buffer member 80 are configured to threadably engage each other.

公开(公告)号：US20190056282A1

公开(公告)日：2019-02-21

申请号：US16079254

申请日：2017-02-21

Applicant: CITIZEN FINEDEVICE CO., LTD. ,  CITIZEN WATCH CO., LTD.

Inventor： Yuta KANAMORI ,  Masanori YOMOYAMA ,  Tetsuya AIBA ,  Ikuo TAKAHASHI ,  Hiroshi NAKAGAWA ,  Kazuo TAKAHASHI ,  Yusuke SATOH

IPC: G01L23/10 ,  G01L19/14

Abstract: A pressure detection device includes: a piezoelectric element that detects a pressure change via a diaphragm head or the like; a circuit board that is provided with a processing circuit that performs electrical processing with respect to a charge signal outputted from the piezoelectric element; a conductive housing member, which has conductivity and is disposed to cover (house) the circuit board, and which is connected to the ground of the circuit board; and a housing (a leading end side housing, the diaphragm head and a rear end side housing), which houses the piezoelectric element, the circuit board and the housing member, and which is electrically insulated from the piezoelectric element, the circuit board and the housing member.