Nsk Corporation

Nippon Seiko Kabushiki Kaisha

Mitsubishi Chemical Corporation

Youichi Matsumoto

Yasuo Murakami

Takanori Tanaka

Takeshi Maejima

Takeshi Murakami

Kinji Yukawa

Kyoko Endo

Tomoko Sasaki

Nobuaki Mitamura

Hiroshi Kawabata

Shigeru Okita

Makoto Ueda

Kyozaburo Furumura

Tomoko Maeda

Jun Takehara

Hisatoshi Uehara

Shinji Fujita

Seigou Urakami

Yasumasa Dekishima

Kenji Takei

Takaaki Shiratani

Kazuaki Kanno

Yuki Takuma

Soji Nishida

Shihomi Suzuki

Kazuhiro Uemura

Jingping Qu

A ball bearing includes an inner ring having a raceway surface, an outer ring having a raceway surface, a plurality of rolling elements rollably disposed between the raceway surface of the inner ring and the raceway surfaces of the outer ring, and a resin cage configured to retain the plurality of rolling elements between the inner ring and the outer ring. The cage is a crown type cage having an annular base portion and a plurality of pockets formed inan axial end face ofthe annular base portion, in which the pockets retain the rolling elements. An axial distance between an axial position of a center of gravity of the cage and a curvature center of a spherical or cylindrical inner surface of each of the pockets is 0.6 or more times a radius of curvature of the inner surface.A hybrid vehicle transmission has this ball bearing.

Ball bearing

A ball bearing includes an inner ring having a raceway surface, an outer ring having a raceway surface, a plurality of rolling elements rollably disposed between the raceway surface of the inner ring and the raceway surfaces of the outer ring, and a resin cage configured to retain the plurality of rolling elements between the inner ring and the outer ring. The cage is a crown type cage having an annular base portion and a plurality of pockets formed in an axial end face of the annular base portion, in which the pockets retain the rolling elements. An axial distance between an axial position of a center of gravity of the cage and a curvature center of a spherical or cylindrical inner surface of each of the pockets is 0.6 or more times a radius of curvature of the inner surface. A hybrid vehicle transmission has this ball bearing.

Ball bearing and hybrid vehicle transmission

The object of the present invention is to provide 3-hydroxy-3-(2-thienyl)propionamides useful as synthesis intermediates of pharmaceutical preparations and the like and a method for obtaining optically active 3-amino-1-(2-thienyl)-1-propanols using the same with high reaction yield, high optical yield and industrially low cost. According to the present invention, 3-amino-1-(2-thienyl)-1-propanols are obtained by carrying out asymmetric reduction of a &#x3b2;-ketocarbonyl compound having thiophene ring in the presence of a catalyst constituted from a compound of a group VIII or IX metal in the periodic table (e.g., a ruthenium compound) and an asymmetric ligand represented by a specified optically active diamine derivative (e.g., a diphenylethylenediamine derivative), or using a cell, a treated product of said cell or the like of a microorganism, and as occasion demands, carrying out amidation of the ester group and then carrying out reduction of the amido group. (each of the substituents is as described in claim).

3-Hydroxy-3-(2-thienyl) propionamides and production method thereof, and production method of 3-amino-1-(2-thienyl)-1-propanols using the same

To predict a correction rated life at high accuracy. A life predicting device executes step S, step S, step Sfor inputting specification information including a basic dynamic rated load C and basic static rated load C, stepfor computing a dynamic equivalent load P based on the specification information. step Sfor setting a reliability factor a, step Sand step Sfor determining a contact ellipse area S, step Sfor inputting a foreign substance purchasing diameter d('debris' means 'foreign substance'), stepfor determining a standardized foreign substance diameter (d/&#x221a; S), step Sfor setting a life correction coefficient abased on the standardized foreign substance diameter, and step Sand step Sfor calculating a correction rated life Lbased on the reliability coefficient, the life correction coefficient, the basic dynamic rated load and the dynamic equivalent load and the like.

Life predicting method for rolling bearing, life predicting device, rolling bearing selecting device using life predicting device, program and environment coefficient determining method

A rolling bearing intended for longer life by improving seizure resistance and wear resistance in the circumstance with slip contact or in the circumstance where lubricant tends to be exhausted, which is manufactured by applying carburization or carbonitridation to an Si-added material to disperse and precipitate carbides or carbonitrides containing Si or Si&#x2014;X (X=one or more of Mn, Mo, and Cr) thereby improving the seizure resistance and the wear resistance by the self-lubrication effect thereof, the size of the carbides or carbonitrides being preferably 10 &#x3bc;m or less for preventing flaking, and the area ratio for the carbides or carbonitrides being preferably 1.0&#x2013;30% for obtaining sufficient self-lubrication effect.

Rolling bearing

A process for efficiently producing a nucleic acid derivative by condensing a specific nitrogen-containing heterocyclic compound such as a dinitrogen 6-membered heterocyclic compound or a trinitrogen 5-membered heterocyclic compound with a pentose using a less expensive and safe reagent. Namely, a process for producing a nucleic acid derivative by condensing a dinitrogen 6-membered heterocyclic compound or a trinitrogen 5-membered heterocyclic compound with a pentose in the presence of an iron halide.

Process for producing nucleic acid derivative

A method and an apparatus for detecting a crack in a bearing including a stationary element, a moving element, and a plurality of rolling elements disposed between the stationary element and the moving element. A crack sensor detects a signal characteristic of a crack in the bearing. A rolling element position sensor detects a position of the rolling elements. A moving element position sensor detects a position of the moving element. When an output signal from the crack sensor is supplied for the first time, based on at least one of position signals respectively supplied from the rolling element position sensor and the moving element position sensor, there is determined a condition of the at least one of position signals to be satisfied when the output signal from the crack sensor is supplied the next time. The at least one of position signals is monitored thereafter to accumulate the output signal from the crack sensor if the output signal is supplied when the at least one of position signals satisfying the condition is supplied, to thereby determine whether or not the crack exists in the bearing based on a result of the accumulation.

Method and apparatus for detecting cracks in bearings

A rolling bearing having an inner ring, outer ring and rolling element, at least one of these elements being made of one of the following first, second or third medium-carbon manganese steels. The first medium-carbon manganese steel includes C: 0.4 to 0.7 wt. %, Si: 0.15 to 1.2 wt. %, Mn: 1.2 to 1.7 wt. %, Al: 200 to 300 ppm, Ti: up to 40 ppm, N: 100 to 200 ppm, S: up to 80 ppm, O: 9 ppm and the balance of Fe. The second steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % in addition to the elements of the first medium-carbon manganese steel. The third medium-carbon manganese steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % instead of Al and N and includes the other elements of the first medium-carbon manganese steel. Each medium-carbon manganese steel is subject to carburizing or carbo-nitriding so as to include a case with a 25 to 45 vol. % retained austenite.

A rolling bearing, comprising an inner race, an outer race and rolling members which roll therebetween, at least one of the inner and outer races being subjected to carburizing and heating treatment, is characterized in that:

Ball-and-roller bearing system

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Kanagawa, Japan

Youichi Matsumoto