Title:
MAGNETIC ENCODER, AND METHOD OF MEASURING ROTATIONAL SPEED OR ROTATION ANGLE
Document Type and Number:
Japanese Patent JP2021019121
Kind Code:
A
Abstract:
To provide a magnetic encoder which is hardly broken even when rotated at a high speed for a long period in a high temperature environment.SOLUTION: The magnetic encoder comprises a magnetic rubber molded product formed by vulcanizing a magnetic rubber composition. The magnetic rubber composition contains 100 pts.mass of a hydrogenated nitrile rubber (A) containing a carboxyl group or a carboxylic acid anhydride, 300 to 700 pts.mass of ferrite magnetic powder (B), and 0.2 to 1.0 pts.mass of polyamine based cross-linking agent (C). The percentage content of the ferrite powder (B) to the mass of the whole magnetic rubber composition is 70 to 82 pts.mass. The magnetic encoder is used while rotating at a circumferential speed over 60 m/sec.SELECTED DRAWING: Figure 1
Inventors:
ISHII SATOSHI
YAMAGUCHI YOSHIHIKO
YAMAGUCHI YOSHIHIKO
Application Number:
JP2019134656A
Publication Date:
February 15, 2021
Filing Date:
July 22, 2019
Export Citation:
Assignee:
UCHIYAMA MFG
International Classes:
H01F1/113; C08K3/22; C08K5/17; C08K5/541; C08L13/00; C08L83/08; G01D5/245; H01F7/02
Domestic Patent References:
| JP2015076515A | 2015-04-20 | |||
| JP2012149222A | 2012-08-09 |
Foreign References:
| WO2015012329A1 | 2015-01-29 | |||
| WO2001041162A1 | 2001-06-07 | |||
| WO2015133465A1 | 2015-09-11 |
Attorney, Agent or Firm:
Setouchi International Patent Firm