Lubricant composition for ball joint and ball joint

Abstract

A lubricant composition for ball joints exhibits excellent low friction not only at ordinary temperatures but also from higher to lower temperatures, and will not leak out of ball joints at higher temperatures. A ball joint has the lubricant composition sealed therein. The lubricant composition contains a base oil including a synthetic hydrocarbon oil, a thickener, and a fatty acid salt of a compound represented by the formula (1): R1—NH—R2—NH2  (1) (R1: hydrocarbon group of C1 to C24; R2: alkylene group of C2 to C4).

Description

[0001] This application is a Continuation of U.S. Ser. No. 10 / 482,511, filed Dec. 31, 2003, which is a 371 National Phase application of PCT International Application No. PCT / JP02 / 06884, filed Jul. 8, 2002, which claims priority to Japanese Patent Application No. 2001-207722, filed Jul. 9, 2001. The contents of all three applications is hereby incorporated by reference in their entireties.FIELD OF ART [0002] The present invention relates to a lubricant composition for ball joints and a ball joint, more specifically a lubricant composition for ball joints having a metal ball stud and a synthetic resin seat for use in steering or suspension systems of automobiles, and a ball joint having such composition sealed therein. BACKGROUND ART [0003] In ball joints used in steering or suspension systems of automobiles, lubricants are sealed in. Lubricants known for such use include a composition containing Duomeen T dioleate as a base oil and a diamide compound (JP-62-54155-B), a composition c...

AI Technical Summary

Benefits of technology

"The present invention provides a lubricant composition for ball joints that has excellent friction properties at both low and high temperatures, and will not leak out of the ball joint even at high temperatures. The composition includes a base oil, a thickener, and a fatty acid salt of a specific compound. The invention also provides a ball joint comprising a metal ball stud and a synthetic resin seat, wherein the ball joint is sealed with the described lubricant composition."

Problems solved by technology

These compositions exhibit excellent low friction at ordinary temperatures, which property is required for ball joints, but cannot maintain the property in higher and lower temperature ranges, causing increased friction.

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