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:
Jan. 10, 2012
Filed:
Apr. 24, 2008
Hidetoshi Takimoto, Tokorozawa, JP;
Takehito Yagi, Odawara, JP;
Yoshiyuki Saito, Tokyo, JP;
Tsuyoshi Terauchi, Yokohama, JP;
Hidetoshi Takimoto, Tokorozawa, JP;
Takehito Yagi, Odawara, JP;
Yoshiyuki Saito, Tokyo, JP;
Tsuyoshi Terauchi, Yokohama, JP;
IHI Corporation, , JP;
Abstract
A film thickness measurement device, which measures the film thickness of an oil film of lubricating oil, formed in a gap between a piston ring and an electrode provided flush with a piston ring sliding surface of a cylinder liner, by detecting the electrostatic capacitance across the gap, employs an electrostatic capacitance detection portion, which charges the electrostatic capacitance by supplying a constant current to the electrode, detects the electrostatic capacitance based on changes in the charging voltage accompanying the charging, and outputs a detection signal indicating the electrostatic capacitance, and a film thickness computation portion, which calculates the film thickness of the oil film based on the electrostatic capacitance indicated by the detection signal input from the electrostatic capacitance detection portion.