Nsk Corporation

Kazuo Akagami

Masahiro Takahashi

Akira Suzuki

Hiroyuki Ito

Emiko Shiraishi

Michiharu Naka

Mamoru Aoki

Masao Yamamoto

Magozou Hamamoto

Tomoyuki Aizawa

Jiami Pu

Eiichi Kawamura

When an inner race ( ) rotates at a speed lower than a predetermined speed, a sealing body ( ) contacts the sealingface part ( ), but when the inner race ( ) rotates at a speed more than the predetermined speed, a contacting pressure to a sealing face part ( ) is reduced or the sealing body ( ) is isolated so as to form a non-contacting seal, and therefore, for example, at the low speed, the sealing body ( ) forms a contacting seal, thereby to compensate a low speed-low sealing ability of the non-contacting seal such as the labyrinth seal, and on the other hand, at high speed rotation, the sealing body ( ) reduces the contacting pressure to the sealing face part ( ), and otherwise separates therefrom to form the non-contacting seal as the labyrinth seal, whereby it is possible to solve the problem of heating or abrasion at the contacting part. Further, a sleeve ( ) is mounted on the supporting edge ( ) of the inner race ( ), thereby to secure the sealing device ( ) without processing a screwing hole in the inner race ( ). Moreover, the sleeve ( ) is optionally processed with a screwing hole ( ), to thereby easily fix the sealing device ( ) by the bolt ( ).

Bearing apparatus of sealing type

A sealed rolling bearing in which a rolling member is disposed in a bearing space formed between an outer race and an inner race to rotate the outer race and the inner race relatively to each other, and rotation seal members are disposed at both ends of the bearing space in the axial direction thereof while a stationary seal member is disposed on the side of the inner race, thereby sealing the bearing space. The bearing is provided with a vent on the side of the inner race for approximating a fluid pressure in the bearing space to an outside fluid pressure by causing the inside of the bearing space to communicate with the outside when the state of fluid in the bearing space and state of the outside fluid have a predetermined relationship.

Sealed rolling bearing

To provide a ball bearing that insures reasonable endurance and which reduces the necessary torque for rotation while causing less fluctuations in torque, a synthetic resin cage of the ball bearing for retaining a plurality of balls so as to roll freely is impregnated with a lubricating oil having a viscosity of 10 to 150 mm.sup.2 /s at 40.degree. C. in an amount of 0.1 to 1.0% by weight of the cage, a film of the lubricating oil is formed in a thickness of 0.03 to 20 .mu.m on the surfaces of an inner race, an outer race, balls and the cage, and the amounts of the oiliness agent and the rust inhibitor that are to be contained in the lubricating oils are limited to the specified ranges.

Method for producing a cage of the ball bearing

Ball bearing and method for producing a cage of the ball bearing

Growing community of inventors

Kanagawa, Japan

Kazuo Akagami