Nissan Motor Company Limited

Mitsuhiro Okuhata

Keizo Otani

Nobuo Kino

Eiji Hirai

Noriko Uchiyama

Tomofumi Furukawa

A rolling element including a base metal, and a nickel coat formed on a surface of the base metal and cooperating with the base metal to constitute a rolling contact surface satisfying condition that a mean value of ratios of Lto Las measured in at least three optional observation areas is in a range of from 1.2 to 2.4, where each observation area is disposed in a cross section taken in a vertical direction relative to the surface of the base metal and is defined by two parallel vertical lines; lengths Land Lrespectively represent a length of an interface between the base metal and the nickel coat, and a length of a reference line segment extending perpendicular to the vertical direction, in same observation area.

Rolling element and a process for producing the rolling element

A rolling bearing used in a system including an automotive power train and a peripheral auxiliary equipment of the power train, and in a compressor. The rolling bearing comprises a first race and a second race. A rolling element is rotatably disposed between the first and second races. A film whose main component is a metal selected from the group consisting of nickel and copper has a thickness ranging from 0.1 to 15 &#x3bc;m. The film is formed on a surface of at least one of the first race, the second race and the rolling element.

Rolling bearing

A rotary member such as a member of a bearing, a rotating member of a transmission or a gear for a motor vehicle, includes a base region of a ferrous base material such as a steel. The rotary member is formed with a hydrogen blocking layer formed in a contact surface for contacting with a mating body in a relative motion. The hydrogen blocking layer includes a concentrated portion formed in the base region and made of a substance lower in hydrogen diffusion coefficient than the base material.

Rotary member and production process

A rolling element for a continuously variable transmission, including input and output disks and a power roller interposed between the input and output disks, the power roller including an inner race, an outer race and a plurality of rolling members interposed between the inner and outer races, the input and output disks and the inner race having rolling contact surfaces coming into rolling contact with each other via lubricating oil, the inner and outer races having rolling contact surfaces coming into rolling contact with the rolling members via lubricating oil, and a nickel-based coat formed on at least one of the rolling contact surfaces, the nickel-based coat having a thickness ranging from 0.1 to 20 &mgr;m.

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Kanagawa, Japan

Mitsuhiro Okuhata