Arrangement for tensioning the drive belt for vehicle accessorie

Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster or shifter driven by electrical or fluid motor

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Details

F16H 714

Patent

active

043559913

ABSTRACT:
A hydraulic tensioning arrangement for an endless drive belt for a vehicle accessories drive system. The vehicle alternator is pivotally mounted on the engine and is driven by a pulley which is drivingly engaged with the drive belt. A hydraulically actuated piston is mounted in a generally fixed position on the engine closely adjacent to the alternator and is operatively connected to the alternator for pivotally moving it to a belt tensioning position. Hydraulic fluid is supplied to the piston cylinder from the vehicle's power steering fluid supply. A ratchet bar is mounted on the piston cylinder and is slidably engaged in a guide bracket mounted on the alternator. A spring-biased pawl is mounted on the guide bracket and is engageable with a series of teeth formed on the extended end of the ratchet bar. The pawl-teeth engagement prevents movement of the alternator away from the belt tensioning position during a decrease in hydraulic fluid or pressure in the piston cylinder to mechanically maintain a constant predetermined belt tensioning force on the belt at all times without the use of springs.

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