Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
2007-07-03
2007-07-03
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C029S445000, C029S527200, C324S207250
Reexamination Certificate
active
10940776
ABSTRACT:
To substantially eliminate deficiencies such as portions of the resinous coating, where the film thickness is reduced considerably during the press-fitting, and to aim at providing a high productivity with a reduced cost and without the possibility of occurrence of rusting after a prolonged time of use under severe environmental conditions due to an excellent anticorrosive property, a magnetic encoder (10) includes a multipolar magnet (14) having a plurality of alternating magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal (11) supporting the multipolar magnet (14). The multipolar magnet (14) is formed of a sintered element prepared by mixing and sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder. The multipolar magnet (14) is fixed on the core metal (1) by staking a portion of the core metal (11), and a sintered element/core metal assembly (21) fixed on the core metal (11) is surface treated to have with an anticorrosive resinous coating (22) for anticorrosive purpose. When the magnetic encoder is press-fitted on an encoder carrier member, one of a press-fitting punch and the magnetic encoder (10) is heated to a temperature within the range of 60 to 150° C.
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Matsui Arito
Murakami Kazutoyo
Nakajima Tatsuo
Oohira Kouya
Hannon Thomas R.
NTN Corporation
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