Overrunning clutch

Details Overrunning clutch Overrunning clutch

1992-12-18

1994-06-07

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Automatic

192 42, 19211332, F16D 334, F16D 1374, F16D 1372

Patent

active

053181603

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.

REFERENCES:
patent: 3668236 (1972-06-01), Cyba
patent: 3668237 (1972-06-01), Cyba
patent: 3691854 (1972-09-01), Barthruff et al.
patent: 4895234 (1990-01-01), Fujino
patent: 5004090 (1991-04-01), Kuribara et al.
patent: 5156246 (1992-10-01), Iga et al.

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