Ntn Corporation

Yosuke Oya

Masaki Egami

Yukihisa Tsumori

Tomohiko Katou

The present invention provides a rolling bearing, for a tenter clip, which is capable of restraining deterioration of a sealing member even though the sealing member contacts ester oil, and is excellent in reliability and durability at high temperatures. A periphery of an outer ring of the rolling bearing for use in the tenter clip of a film-stretching apparatus is lubricated with the ester oil. In the sealing member which covers openings disposed at both axial ends of an inner ring and the outer ring of the rolling bearing, at least a portion of the sealing member which contacts the ester oil is made of (A) a fluororubber molding of a vulcanizable fluororubber composition which comprises a copolymer containing tetrafluoroethylene (TFE), propylene, and a to-be-crosslinked monomer consisting of unsaturated hydrocarbon, having two to four carbon atoms, in which a part of hydrogen atoms is substituted with fluorine atoms or (B) a fluororubber molding of at least one fluororubber composition selected from a vulcanizable fluororubber composition containing a TFE-propylene binary copolymer and a vulcanizable fluororubber composition containing a vinylidene fluoride-TFE-propylene ternary copolymer.

Rolling bearing for tenter clip

A relief groove () is provided at a corner in which a track surface () and a flange surface () cross, in an inner ring () of a cylindrical roller bearing. A chamfer () is provided at a corner part in which a rolling surface () and an end surface () cross, in a cylindrical roller (). When it is assumed that the height of the chamfer () from the rolling surface () is 'h' and the curvature radius of the chamfer is 'R', the relation such that 1.0&#x2266;R/h&#x2266;1.5 is satisfied.

Cylindrical roller bearing

In a fixing structure for a rolling bearing in which a bearing fixing ring is incorporated in a device and a rotating member is fixed to a bearing rotating ring using bolts, fastening areas with the bolts are set so that the natural frequency of the device as a whole is larger than the frequency of vibration resulting from the rotation of the rolling bearing. This prevents generation of noise or vibration in the rolling bearing.

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Kuwana, Japan

Yosuke Oya