Two-speed planetary friction accessory drive

Details Two-speed planetary friction accessory drive Two-speed planetary friction accessory drive

1991-04-04

1992-06-16

Wright, Dirk

Planetary gear transmission systems or components

Planet pinion is friction gear

Variable speed ratio

475185, F16H 1314

Patent

active

051220997

ABSTRACT:
A planetary friction roller drive (30, 66, 84, 26) adapted particularly for use in driving automotive accessories such as an alternator wherein provision is made for delivering engine torque to the ring roller element (26) of the planetary friction drive and for connecting drivably the sun roller element (30) of the friction drive to a driven accessory such as an alternator and wherein a torque flow path characterized by two speed ratios is effected by a compound planetary carrier assembly (50) as a preload at the friction drive contact locations between the planetary rollers (66, 84) and the ring roller element (30) and between the planetary rollers (66, 84) and the sun roller element (30) of the planetary assembly is established by a preload spring (134) actng in a tangential direction, the reaction torque for the planetary friction drive being established by a selectively engageable brake (136) acting on the sun roller element (30) thus effecting a ratio transition from unity.

REFERENCES:
patent: 3160031 (1964-12-01), Bugg
patent: 3630102 (1971-12-01), Larsen
patent: 4080843 (1978-03-01), Underwood
patent: 4854192 (1989-08-01), Churchill et al.
patent: 4862770 (1989-09-01), Smith
"Sizing Criteria for Traction Drives", by D. A. Rohn, S. H. Loewenthal and J. J. Coy, NASA Advanced Power Transmission Technical Report 82-C-16, dated Jun. 9-11, 1981.
"Multiroller Planetary Friction Drives", SAE Paper 660763, Oct. 1966, by A. L. Nasvytis.

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