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:
Oct. 26, 2004
Filed:
Aug. 14, 2001
Mitsuru Kondo, Takasago, JP;
Kazuharu Hirokawa, Takasago, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A rotary shaft axial elongation measuring method and device enable accurate measuring of rotary shaft axial elongation regardless of the amount of the elongation. Grooves ( ), arranged opposite to each other in a turned V shape along the axial direction, are provided in a rotational surface of the rotary shaft ( ) whose axial elongation is to be measured. A sensor ( ) is arranged opposite the rotational surface of the rotary shaft ( ). The sensor ( ) generates pulses upon passing of the groves ( ) following rotation of the rotary shaft ( ). As a circumferential interval between the grooves ( ) differs according to the axial directional position of the rotary shaft ( ), if the positions of the grooves ( ) at the position of the sensor ( ) change due to the axial elongation, the interval of the pulses generated by the sensor ( ) changes. Thus, by the change in the pulse generation interval, the axial elongation is measured.