The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1994
Filed:
Dec. 18, 1992
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An overrunning clutch which exhibits improved resistance to wear owing to grease filled thereinto which exhibits resistance to thermal oxidation even at increased temperatures due to overrunning. The overrunning clutch has a plurality of cam cases formed between its outer and inner members and also has a plurality of rollers arranged one by one in the cases. The cases are filled with a grease containing a first extreme pressure additive which is liquid and a second extreme pressure additive which is solid and yet melts at a prescribed temperature. Below the prescribed temperature, only the first extreme pressure additive functions as a lubricant, so that the rollers permit the engagement of the outer and inner members for the transmission of turning force from one member to the other. When the prescribed temperature is reached in the overrunning state, the second extreme pressure additive melts to function as a lubricant, thereby preventing the rollers from wearing. The second extreme pressure additive is halogen-based and decomposes below the ignition point of grease, thereby exhibiting flame retardance. Therefore, it also protects grease from thermal oxidation when the grease is heated to a temperature close to its ignition point.