Ntn Corporation

Hiroshi Takiuchi

Masatsugu Mori

Mamoru Mizutani

Hideto Torisawa

Mineo Koyama

Keiichi Ueda

Futoshi Kosugi

Takuji Kobayashi

Sun-Woo Lee

Satomi Toyoda

Naoshi Ohashi

Tadayoshi Yonezawa

A bearing performance automatic calculation service device is provided which allows a user to receive an automatic calculation service at any time in any location, which easily ensures reliability in terms of leakage of transmitted/received data, and which is easily used in terms of an input operation. An e-mail address is assigned, which is used only for receiving a request for an automatic calculation service. It is determined whether authentication information and a description content of a fileattached to an e-mailsatisfy a condition. Evaluation of performance of a bearing with respect to a determined evaluation item by means of a calculation formula on the basis of the file is performed. A result of the evaluation to the fileis added to create a sending file. The sending fileis attached and sent back by the e-mail sending module

Bearing performance automatic calculation service device

Inner and outer ring spacers include respective load bearing portions, which are positioned on respective sides of a gap of a predetermined size and which confront with each other in an axial direction. Each of the inner and outer ring spacers is divided into two spacer segments along a surface of division extending in a direction perpendicular to the axial direction and passing through the associated load bearing portions. Inner and outer ring divided spacer segments, having the load bearing portions, are simultaneously machined so as to have the same axially measured width. Along therewith, inner ring divided spacer segments, having no load bearing portions, are simultaneously machined so as to have the same axially measured width, thereby rendering the latter axially measured width to be larger than the former axially measured width by a quantity corresponding to the gap.

Method for manufacturing spacers for spindle device

To provide a rolling bearing assembly, in which a grease filled within the bearing assembly is utilized to achieve a high speed feature, a long life and a maintenance-free and a lubricant oil can be stably supplied from a minute gap, a stepped face continued from the raceway surface is provided in a stationary raceway ring unit of an inner and outer ring units in a direction away from rolling elements. A gap forming piece having a free end confronting the stepped face is provided to define therebetween a flow passage and a grease reservoir communicated with the flow passage. The rolling bearing assembly is so designed that a heat cycle can be induced in the grease reservoir and, base oil of the grease can be urged to flow out from the gap by the effect of a pressure variation caused by the temperature rise.

Rolling bearing

A rust preventive package to contain a bearing used for a machine tool includes a lubricant oil which is used when the bearing is operated, a vaporizable rust preventive sheet wrapped around the bearing, and a box. A method of packaging a bearing used in a machine tool includes applying a lubricant oil which is used when the bearing is operated and wrapping a vaporizable rust preventive sheet around the bearing.

Rust preventive package containing bearing for machine tool and and rust preventive packaging method

A bearing assembly includes a double-row cylindrical roller bearing having no seals and having a grease sealed in its internal space. A double-row angular ball bearing having seals is provided in juxtaposition with one end face of the double-row cylindrical roller bearing. During run-in, part of the grease sealed in the double-row cylindrical roller bearing adheres to the outer surface of one of the seals of the angular ball bearing that faces the internal space of the cylindrical roller bearing. This increases the initial amount of grease sealed in the internal space of the cylindrical roller bearing, thereby prolonging its life.

Sealing arrangement for rolling bearing and spindle of machine tool

Contact surface pressure P increases rather drastically in proportion to skew angle &#x3b8; within the range of 0&#x3c;&#x3b8;&#x2266;&#x3b8;, but because the critical skew &#x3b8;is restricted to be small, the contact surface pressure P changes in a low range below a certain level Pat which wear occurs in contact portions. Thus restricting the critical skew angle &#x3b8;to a small angle reduces the contact surface pressure P and suppresses heat generation and wear in the contact portions.

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Kuwana, Japan

Hiroshi Takiuchi