Jtekt Corporation

Hitachi Chemical Company, Ltd.

Koyo Seiko Company, Ltd.

Eneos Corporation

Takeshi Tsuda

Hirokazu Arai

Yurie Hagino

Kazumi Sakai

Go Tatsumi

Junya Ooitsu

Yusuke Ayame

Kiyomi Sakamoto

Setsuo Nagai

Hiroto Oda

Kazuki Higashida

A grease composition including: a base oil; a thickener; a zinc sulfonate; a polysulfide; an overbased calcium sulfonate; and triphenyl phosphite, in which a proportion of the zinc sulfonate with respect to a total mass of the base oil and the thickener is 0.030 mass % to 0.045 mass % in terms of a zinc content, a proportion of the polysulfide with respect to the total mass of the base oil and the thickener is 0.16 mass % to 0.24 mass % in terms of a sulfur content, a proportion of the overbased calcium sulfonate with respect to the total mass of the base oil and the thickener is 0.010 mass % to 0.015 mass % in terms of a calcium content, and a proportion of the triphenyl phosphite with respect to the total mass of the base oil and the thickener is 0.24 mass % to 0.36 mass %.

Grease composition, and rolling bearing

A grease composition includes base oil, a thickener, and an inorganic additive. The base oil is a poly-&#x3b1;-olefin having a base oil kinematic viscosity of 15 to 50 mm/s at 40&#xb0; C. The thickener is a diurea expressed by Structural Formula (1). The content of the thickener is 10 to 22 mass % with respect to the total amount of the base oil and the thickener. The inorganic additive is a mixture containing sepiolite and bentonite, and is organically modified. The content of the inorganic additive is 2 to 20 mass % with respect to the total amount of the base oil and the thickener.R&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;R&#x2003;&#x2003;(1)

Grease composition and rolling bearing

An inventive ball bearing retainer () is entirely composed of a resin composition, and has pocket surfaces () for retaining balls () and projections () provided on the pocket surfaces () and containing a solid lubricant (CB). A ball bearing () incorporates the ball bearing retainer (). By the effect of the solid lubricant (CB), the projections () are less liable to be worn out in a short period particularly when the ball bearing () is used in a higher temperature environment. The projections () define clearances between the balls () and the pocket surfaces (), making it possible to maintain the effect of preventing noise, increase in the torque of the ball bearing (), reduction of the service life of a lubricant and the like for a longer period of time.

Ball bearing retainer, and ball bearing employing the same

A resin pulley according to the present invention is obtained by molding a resin composition containing a phenol resin serving as a base resin, 15 to 50% by weight of an inorganic powder having a Mohs hardness of not less than 6.5, 20 to 40% by weight of a reinforcing fiber, and 1 to 5% by weight of a lubricant and thermosetting the phenol resin, and is superior in dimensional stability and strength, is also superior in wear resistance particularly in a dust atmosphere or the like, and is superior in practicality as an alternate to a metal pulley.

Resin pulley formed of a resin composition having a phenol resin, an inorganic powder , a reinforcing fiber, and a lubricant

A power transmission coupling comprises a power transmission member having first and second ends. The first and second ends are respectively connected to ends of corresponding shafts through corresponding first and second sliding pairs. The first and second sliding pairs are different in sliding direction from each other. The power transmission member is made of a fiber-reinforced synthetic resin of a polymer alloy comprising polyamide MXD6 and polyphenylene ether, to which glass fibers are being blended.

Power transmission coupling and power transmission apparatus

Growing community of inventors

Kashiba, Japan

Takeshi Tsuda