Kyodo Yushi Co., Ltd.

Ntn Corporation

Denso Corporation

Jtekt Corporation

Kabushiki Kaisha Tokai Rika Denki Seisakusho

Mitsuhiro Kakizaki

Shinichi Takabe

Shinya Kondo

Takashi Okaniwa

Takaaki Shibata

Kiyoshi Takeuchi

Minoru Ishijima

Toshiaki Endo

Yoichi Suzuki

Shozo Ikejima

Ryuji Nakata

Daisuke Tsutsui

Koji Sakakibara

Keizo Nagasawa

Yukio Hasegawa

Sugako Otake

Yukio Asahara

Hiroaki Takahashi

Suehiro Okazaki

Koji Hisaka

Kyosuke Ikuma

Miwa Hokii

Tomohiro Monna

Yosuke Fujiwara

Tsuyoshi Kochi

Provided is a grease composition for a ball joint that can reduce the wear of a ball seat at a slide region and also has excellent compatibility with a dust cover. The grease composition for a ball joint comprises a base oil, a thickener, and an additive. The base oil contains an ethylene-&#x3b1;-olefin copolymer and the kinetic viscosity of the base oil at 40&#xb0; C. is 2,000 to 6,000 mm/s. The additive contains a polar wax (e.g., monoamide wax or ester wax).

Grease composition for ball joint

The invention provides a grease composition capable of smoothly operating the lubricated parts even under wide-ranging temperature conditions, and at the same time, exhibiting excellent noise reducing effect on the lubricated parts. The grease composition containing a base oil and a thickener is provided, wherein the base oil includes at least one first base oil selected from the group consisting of poly-&#x3b1;-olefins and ethylene-&#x3b1;-olefin oligomers and at least one second base oil selected from the group consisting of polybutene, polyisobutylene, polymethacrylate, and styrene based copolymers, with the first base oil being contained in an amount of 65 mass % or more and the second base oil being contained in an amount of 1 mass % or more and less than 35 mass % based on the total mass of the base oil, the base oil having a kinematic viscosity of 350 to 1400 mm/s at 40&#xb0; C., the first base oil having a kinematic viscosity of 300 to 1200 mm/s at 40&#xb0; C., and the second base oil having a kinematic viscosity of 1500 to 200,000 mm/s at 40&#xb0; C.

Noise reducing grease composition

The invention provides a grease composition for constant velocity joint containing the components (a) to (g) below and a constant velocity joint containing said composition. (a) a diurea thickening agent having the following formula (1):RNH&#x2014;CO&#x2014;NH&#x2014;CH--CH&#x2014;CH--NH&#x2014;CO&#x2014;NHR&#x2003;&#x2003;(1)wherein Rand Rmay be the same or different and represent C-Calkyl groups, (b) an ester synthetic oil, (c) a mineral oil and/or a synthetic hydrocarbon oil, (d) a molybdenum dialkyldithiocarbamate, (e) molybdenum disulfide, (f) a polytetrafluoroethylene, and (g) a zinc dithiophosphate compound. The grease composition of the invention reduces variations in rotational resistance of the constant velocity joint at a low temperature.

Grease composition for constant velocity joint and constant velocity joint

A lubricant composition, which is low in friction, does not have an attacking property against polyamide resin, etc., is excellent in heat resistance, and especially does not undergo deterioration or loss of the respective characteristics in a short term when used under a high temperature environment, is provided along with a speed reduction gear and an electric power steering apparatus that use the lubricant composition. The lubricant composition has blended therein a synthetic hydrocarbon oil, a urea thickener, zinc stearate, and a sulfur-based antioxidant. A speed reduction gear has a portion of engagement of a small gear and a large gear filled with the lubricant composition. In an electric power steering apparatus, an output of a steering assisting electric motor is speed reduced and transmitted to a steering mechanism via the speed reduction gear.

Lubricant composition, speed reduction gear, and electric power steering apparatus

The present invention provides a grease composition for use in constant velocity joints, which comprises the following components (a) to (g) and a constant velocity joint comprising the grease composition sealed or encapsulated therein: The grease composition can efficiently prevent a temperature rise of a constant velocity joint and can impart excellent durability to the joint.

Grease composition for constant velocity joint and constant velocity joint containing the composition sealed therein

A grease composition for constant velocity joints comprising: (a) a base oil; (b) a diurea thickener of the formula (1):

Grease composition for constant velocity joints

The present invention provides a grease for a slide contact which comprises (i) a synthetic hydrocarbon oil, (ii) 0.2-3.0 parts by weight of at least one inorganic substance whose mean particle size is 0.36 .mu. or less, selected from the group consisting of zinc oxide, ferric oxide, and clay minerals which produce magnesium oxide through thermal decomposition thereof at high temperature, (iii) 3-20 parts by weight of 12-hydroxy lithium stearate, and (iv) 0.1-5.0 parts by weight of phenolic and/or amine primary antioxidants, said blending amounts of the ingredients being based on 100 parts by weight of the grease.

Grease for a slide contact

Growing community of inventors

Fujisawa, Japan

Mitsuhiro Kakizaki