Ntn Corporation

Eiichiro Shimazu

Masaki Egami

Takuya Ishii

Mari Kataoka

Kenji Ito

Takayuki Kawamura

Mitsuo Kawamura

Kazunori Kubota

Hiroshi Niwa

Takahiro Okuno

Yasutake Hayakawa

Koya Ohira

Ryuichi Sakamoto

Junichi Ooshimo

Hidenobu Mikaki

A cage is made of a magnesium alloy such as AZ91D, and is molded by means of injection molding. In this cage, a confluence region is brought away to outside the cage during the injection molding. The confluence region is a region including a void formed by merging of flows of the magnesium alloy. When observing a cross sectional surface of the cage, a ratio of an &#x3b1; phase having a grain size of 20 &#x3bc;m or greater is less than 15% in the magnesium alloy constituting the cage.

Cage and rolling bearing

An environment-friendly rolling bearing is proposed in which at least one of inner ring, outer ring, rolling elements, seals and retainer is formed of a biodegradable material.

Rolling bearing

Resin composition and precision sliding parts are proposed. The resin composition includes a modified polyphenylene ether resin as a main component, a fibrous reinforcing agent, and a solid lubricant comprising tetrafluoroethyelene and graphite in the amount of 2-30 volume %. The modified polyphenylene ether resin is prepared by blending a polystyrene-family resin with a polyphenylele ether resin. The ratio of the tetrafluoroethylene resin and the graphite is 1:1 to 1:5. The fibrous reinforcing agent is glass fiber or carbon fiber. The fibrous reinforcing material is orientated such that the angle of fiber axis is not more than 30 degrees with respect to the sliding surface. The fibrous reinforcing material is a fibrous reinforcing material having a fiber diameter of 10 &mgr;m or less.

Resin compositions and precision sliding parts made of the same

A machine part is proposed which is made from TPI resin and is high in wear resistance and durability. The machine part is formed from a composition comprising 100 parts by weight of a thermoplastic polyimide resin, and 10-100 parts by weight of a reinforcing material, the thermoplastic polyimide resin having a crystallinity of 10% or over. The machine part may be a gear, a friction wheel or a cam used in a mechanical transmission. The crystallinity of the resin is adjusted to 10% or over by injection-molding the resin composition, and heating the thus injection-molded article at 220-340&deg; C. for 5-24 hours.

Resin parts for mechanical transmission

An oil-submerged sliding member which has a good sealability and wear resistance and low attack to the mating member and which can be used with either a soft or a non-soft mating member. It is made from a resin composition comprising 30-88% by weight of a crosslinked polyallylene sulfide resin having a melt viscosity of 2000-5000 poise at 300.degree. C., 10-45% by weight of a carbon fiber, and 2-25% by weight of recycled polytetrafluoroethylene resin powder, and if required, not more than 10% by weight of molybdenum disulfide. Also, oil seal rings comprising the oil-submerged sliding member.

Oil seal ring

Growing community of inventors

Mie, Japan

Eiichiro Shimazu