Nsk Corporation

Idemitsu Kosan Company, Limited

Shinya Nakatani

Atsushi Yokouchi

Yukitoshi Fujinami

Michita Hokao

Hirotoshi Miyajima

Seiichi Moriyama

Hitoshi Hata

Yasuyuki Matsuda

Tahei Okada

Yasunobu Fujita

Kazunori Takahashi

Masahiko Yamazaki

Yoshinori Takahashi, Legal Representative

Hirotoshi Miyazima

Hiroshi Sato

Grease which includes a base oil containing at least 50% by mass of a specific diester compound of a glycol with a branched carboxylic acid, and a specific diurea compound as a thickener. The grease is excellent in low-temperature performance and has low oil separation tendency. In particular, when used in a rotation transmission device having a built-in one-way clutch, the grease can provide satisfactory clutch engagement performance (intermeshing) at low temperatures and is less apt to cause oil separation under high centrifugal force.

Grease

A grease which comprises a base oil containing at least 50% by mass of a diester compound having a total carbon number of 28 to 40 and represented by the general formula (I):ROOC&#x2014;(R)&#x2014;COOR&#x2003;&#x2003;(I)wherein Rand Reach independently represent a Cto Cmonovalent aliphatic hydrocarbon group, Rrepresents a Cto Cdivalent hydrocarbon group and n is 0 or 1. The grease is excellent in both low-temperature performance and high-temperature performance and has low oil separation tendency even under high centrifugal force (acceleration). In particular, when the grease is used in a rotational transmission device having a built-in one-way clutch, the grease can provide satisfactory clutch engagement property (intermeshing ability) at low temperatures and a prolonged bearing life at high temperatures and is less apt to cause oil separation under high centrifugal force.

A telescopic shaft for vehicle steering installed in a vehicle steering shaft. A male shaft and a female shaft are non-rotatably and slidably fitted to each other and an outer peripheral portion of the male shaft and an inner peripheral portion of the female shaft come in contact with each other to transmit a torque during rotation. A grease composition which has an apparent viscosity of 400 to 750 Pa&#xb7;s (25&#xb0; C.) at a shear rate of 10 secas defined in JIS K2220 is enclosed in a gap between the outer peripheral portion of the male shaft and the inner peripheral portion of the female shaft.

Telescopic shaft for vehicle steering shaft and grease composition for lubricating telescopic shaft

A linear motion device has: a linear motion body externally fitted onto a shaft and making a relative linear motion along the shaft; a plurality of balls retained in a rolling element groove formed in an inner surface of the linear motion body, and rolling between the rolling element groove and the shaft; separators interposed among the balls; and a circulating path formed in the linear motion body and for circulating the balls from one end side of the rolling element groove to the other end side thereof; wherein the linear motion device is charged with grease containing base oil which is 220-395 in worked penetration defined by JIS K2220 and 50-500 mm/s in kinematic viscosity at 40&#xb0; C.

Linear motion device

A grease composition is produced by mixing a thickener comprising a fluoro resin and a second thickener component (a metallic soap, a complex metallic soap, an N-substituted terephthalamic acid metal salt, organic bentonite or a calcium sulfonate complex) into a base oil. This grease composition is excellent in heat resistance, load carring capacity, water resistance, rust protection, lubricating life and the like. A rolling apparatus filled with the above grease composition has excellent lubricating ability and is long-lived under high-temperature conditions. Moreover, a grease composition is produced by mixing a thickener comprising a fluoro resin and carbon black as a second thickener component into a base oil. This grease composition is excellent in heat resistance, water resistance, rust protection, lubricating life, electric conductivity and the like. A rolling apparatus filled with the above grease composition has excellent electric conductivity and is long-lived under high-temperature conditions.

Grease composition and rolling apparatus

A grease composition with a thickener of a calcium sulfonate complex and a second thickener component in a base oil. The second thickener component may be, for instance, polyurea, a metallic soap, a complex metallic soap or an N-substituted terephthalamic acid metal salt. Alternatively, a grease composition with a thickener of an N-substituted terephthalamic acid metal salt and a second thickener component in a base oil. Furthermore, a grease composition with a thickener component of polyurea and complex metallic soap in an ester oil. Still further, a grease composition with a thickener of polyurea and a complex metallic soap in a base oil.

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Fujisawa, Japan

Shinya Nakatani