Pressure detection device, internal combustion engine equipped with the same, and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2018087993-A1
Application number	US-201715711321-A
Country	US
Kind code	A1
Filing date	Sep 21, 2017
Priority date	Sep 27, 2016
Publication date	Mar 29, 2018
Grant date	—

Abstract

A pressure detection device includes: a cylindrical body made of a conductor; a pressure receiver made of a conductor, the pressure receiver being mounted to one end side of the body and receiving pressure from the outside; a signal generator arranged inside the body, the signal generator being electrically connected to the pressure receiver and generating a signal corresponding to the pressure received by the pressure receiver; and a cover made of an insulator with a lower thermal conductivity than thermal conductivities of the body and the pressure receiver, the cover continuously covering an outer surface of the pressure receiver and a portion of an outer surface of the body, the portion being located at a side closer to the pressure receiver.

First claim

What is claimed is:

1 . A pressure detection device comprising:
a cylindrical body made of a conductor; a pressure receiver made of a conductor, the pressure receiver being mounted to one end side of the body and receiving pressure from the outside; a signal generator arranged inside the body, the signal generator being electrically connected to the pressure receiver and generating a signal corresponding to the pressure received by the pressure receiver; and a cover made of an insulator with a lower thermal conductivity than thermal conductivities of the body and the pressure receiver, the cover continuously covering an outer surface of the pressure receiver and a portion of an outer surface of the body, the portion being located at a side closer to the pressure receiver.

2 . The pressure detection device according to claim 1 , wherein the cover includes a first cover layer and a second cover layer, the first cover layer being arranged on the body and the pressure receiver, the second cover layer being arranged on the first cover layer and having a higher porosity than a porosity of the first cover layer.

3 . The pressure detection device according to claim 2 , wherein the cover further includes a third cover layer arranged on the second cover layer, the third cover layer having a lower porosity than the porosity of the second cover layer.

4 . An internal combustion engine equipped with a pressure detection device, comprising:
a cylinder head having a communication hole, the communication hole communicating a combustion chamber with the outside of the combustion chamber, the combustion chamber being located at one end side, the outside of the combustion chamber being located at the other end side; and a pressure detection device inserted into the communication hole to be mounted to the cylinder head, the pressure detection device detecting pressure inside the combustion chamber, wherein the pressure detection device includes:
a cylindrical body made of a conductor, the body being arranged so as to be present inside and outside of the communication hole;
a pressure receiver made of a conductor, the pressure receiver being mounted to the one end side of the body and receiving pressure from the combustion chamber;
a signal generator arranged inside the body, the signal generator being electrically connected to the pressure receiver and generating a signal corresponding to the pressure received by the pressure receiver; and
a cover made of an insulator with a lower thermal conductivity than thermal conductivities of the body and the pressure receiver, the cover continuously covering an outer surface of the pressure receiver and a portion of an outer surface of the body, the portion being located inside the communication hole.

5 . A method for manufacturing a pressure detection device comprising:
mounting a pressure receiver to one end side of an cylindrical body so as to electrically connect the pressure receiver and the body, the pressure receiver and the body each being made of a conductor, the pressure receiver receiving pressure from the outside; forming a cover on outer surfaces of the body and the pressure receiver by an aerosol deposition method, the cover being made of an inorganic insulator; and mounting a signal generator inside the body so as to electrically connect the signal generator and the pressure receiver, the signal generator generating a signal corresponding to the pressure received by the pressure receiver.

Assignees

• Citizen Finedevice Co Ltd
• Toyota Motor Co Ltd
• Citizen Watch Co Ltd

Inventors

• Satoh Yusuke
• Takahashi Kazuo
• Sudo Aki
• Sasaki Keisuke
• Nagai Masakatsu

Classifications

• G01L23/10 Primary

  by pressure-sensitive members of the piezoelectric type · CPC title

• G01L23/222

  using piezoelectric devices · CPC title