Maintenance friendly variable speed drive and methods

Endless belt power transmission systems or components – Control for variable input to output speed-ratio

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Details

474 11, F16H 5900

Patent

active

052363953

ABSTRACT:
A variable speed belt drive of the type having a pair of shiftable discs received on respective input and output shafts with a drive belt entrained thereabout further includes a cooperating housing backbone and support bracket. The housing backbone supports one axial end of the output shaft, and supports the support bracket, which extends through the loop of the drive belt to support the opposite end of the output shaft. The straddle support arrangement permits use of a nonload bearing housing cover and permits the performance of maintenance procedures for the drive belt and input shaft without disengaging alignment and support of the output shaft. One end of the input shaft is supported by the housing and the opposite end is supported with a thrust bearing which is received in a pivot mounted shifting yoke. The yoke cooperates with a member which is axially moved along a shifting screw, to transmit axial shifting force through the thrust bearing to the input shaft so as to change speeds for the variable belt drive. The output shaft support bracket cooperates with the housing to support the shifting screw. The body of the housing serves an alignment function for the fixed constant speed disc of the input shaft. Mounting the support bracket automatically aligns discs on the output shaft per snap rings received in predetermined slots on such shaft for axially situating bearings supporting the output shaft.

REFERENCES:
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patent: 4370139 (1983-01-01), Zigler
patent: 4384863 (1983-05-01), Huff et al.
patent: 4411590 (1983-10-01), Meredith
patent: 4425102 (1984-01-01), Huff et al.
patent: 4740191 (1988-04-01), Takano et al.
patent: 4770065 (1988-09-01), Woyton
patent: 4946424 (1990-08-01), Sakakibara et al.
Brochure for Reeves Moto Drive variable speed mechanical drive and Reeves MAS 51 variable speed mechanical drive, by Reliance Electric Industrial Company, 1989.
Product literature for Reeves Moto Drive variable speed mechanical drive, four pages, undated.
Product literature for SEW EURODRIVE VARIGEAR belt-type drives, five pages, including catalog pp. 1-3, and 60, undated.
Product lierature for Electro-VariPower infinitely variable speed belt drives, publication EVPB3, six pages, by ElectroPower Gears Limited of Aylesbury England, undated.
Product literature, one page, for PT-90 Electra Motors variable speed drives, by Sterling Electric of Irvine, California, undated.
Product literature for U.S. VARIDRIVES, by U.S. Electrical Motors, one page, undated.

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