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A Rzeppa-type CV joint. A constant-velocity joint (also called a CV joint and homokinetic joint) is a mechanical coupling which allows the shafts to rotate freely (without an appreciable increase in friction or backlash) and compensates for the angle between the two shafts, within a certain range, to maintain the same velocity.
Used in CV joints and space vehicles. [3] Does lubricate in vacuum. Hexagonal boron nitride. Used in space vehicles. Also called "white graphite." Tungsten disulfide. Similar usage as molybdenum disulfide, but due to the high cost only found in some dry lubricated bearings.
Both cars had endured troubles right through the race, and every pit-stop needed attention – extra water for the Matra's leaking engine and grease added to the Gulf's fragile CV-joint. [10] First GT home from a close race-long battle was the Charles Pozzi Ferrari 365 of Cyril Grandet/Dominique Bardini finishing fifth.
The grease helps to prevent joints from "freezing", as well as ensuring high vacuum systems are properly sealed. Apiezon or similar hydrocarbon based greases are the cheapest, and most suitable for high vacuum applications.
Ramsay grease is a vacuum grease, used as a lubrication and a sealant of ground glass joints and cocks on laboratory glassware, e.g. burettes. It is usable to about 10 −2 mbar (about 1 Pa) and about 30 °C. [1] Its vapor pressure at 20 °C is about 10 −4 mbar (0.01 Pa). [2] It is named after Sir William Ramsay. [3]
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