Patent Number: 7,086,981

Title: Transmission and constant speed accessory drive

Abstract: An infinitely variable speed ratio planetary ball transmission comprising planetary members in rolling contact with moveable inner and outer races and a constant speed accessory drive system utilizing the transmission. The transmission is infinitely variable between ratios of approximately 0.3 and 1.0. A transmission input shaft is connected to a prime mover such as a vehicle engine crankshaft by a drive belt. The transmission comprises at least one output shaft that is coaxial with the input shaft. An output pulley is attached to the output shaft. A belt is engaged between the output pulley and various engine accessories. A second end of the transmission output shaft may be directly coupled to an engine accessory mounted on the transmission. An included control system senses a crankshaft speed. A processor analyses the crankshaft speed and accordingly adjusts the transmission ratio using a stepper motor connected to a worm drive to maintain a constant output speed regardless of crankshaft speed.

Inventors: Ali; Imtiaz (Lathrup Village, MI), Serkh; Alexander (Troy, MI)

Assignee: The Gates Corporation

International Classification: F16H 37/02 (20060101); F16H 13/08 (20060101)

Expiration Date: 8/08/02018