Nissan Motor Company Limited

Kabushiki Kaisha Kobe Seiko Sho

Tohoku University

Takuro Yamaguchi

Keizo Otani

Makoto Kano

Yoshiteru Yasuda

Nobuo Kino

Noriko Uchiyama

Jun Katoh

Fumihiko Gejima

Hiroaki Matsumoto

Yusuke Okamoto

Sadao Watanabe

Toshiki Satou

Shuji Hanada

Masakazu Ikeda

Satoshi Abe

A gear comprised of a tooth surface and a hard carbon film formed on at least a part of the tooth surface. When the gear is used in lubricant including a specific component, a friction of a tooth surface of the gear is largely decreased, and therefore the gear performs an excellent power transmission efficiency. Further, when the gear is employed in a planetary gear mechanism or speed reducing mechanism which has a plurality of meshing portions of gears, the power transmission efficiency of the mechanism is also improved.

Gear

A titanium alloy contains vanadium, from 10 to 20% by weight; aluminum, from 0.2 to 10% by weight; and a balance essentially titanium, and the alloy has a microstructure including a martensite phase. Alternatively, the titanium alloy contains vanadium, from 10 to 20% by weight; aluminum, from 0.2 to 10% by weight; and a balance essentially titanium, and the alloy has a microstructure including a &#x3b2; phase capable of transforming into a martensite phase by cold working or cooling under a room temperature.

Titanium alloy of low Young's modulus

A high strength gear is provided which comprises a base metal of an iron-base alloy, the base metal being carburized or carbonitrided and having a tooth surface, and a coating containing Fe nitride and/or Fe carbonitride, formed on the tooth surface. A method of forming a high strength gear is also provided.

High strength gear and method of producing the same

A rolling element for a continuously variable transmission, including a plurality of rolling members having rolling contact portions that come into rolling contact with each other via lubricating oil. At least one of the rolling contact portions includes an outer surface layer having a surface microhardness of not less than Hv 750, a surface residual compressive stress of not less than 1000 MPa and a residual austenite content of not more than 10% by volume.

Rolling element for a continuously variable transmission (CVT), a CVT using the rolling element and a method for producing the rolling element

A method and apparatus for inspecting a rupture initiation in an article. While a load is applied to the article repetitively, an elastic wave is monitored by an elastic wave sensor which converts it into an electric signal. The electric signal is fed to a signal transmission device having a capacity of transmitting low-frequency components of the electric signal. The transmitted electric signal is divided into successive signal segments. The successive signal segments are averaged to produce an averaged signal waveform informing the presence of a rupture initiation in the article.

Rupture initiation inspecting method and apparatus

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Yokohama, Japan

Takuro Yamaguchi