Belt alternator starter accessory drive with dual tensioner

Details Belt alternator starter accessory drive with dual tensioner Belt alternator starter accessory drive with dual tensioner

2005-06-15

2009-02-24

Nguyen, Thu (Department: 4155)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Load responsive tension adjuster or shifter

C474S110000, C474S135000, C474S101000, C474S134000, C474S137000

Reexamination Certificate

active

07494434

ABSTRACT:
An accessory drive for an engine has a belt driven starter generator adapted for driving and being driven by the engine. In an exemplary embodiment, the drive includes a first engine drive pulley and a second starter drive pulley. A drive belt engages the drive pulleys for driving either pulley from the other. A dual belt tensioner made as a preassembled unit has a carrier with a central pivot mounted to the engine and first and second carrier arms extending radially from the central pivot. A first tensioner mounted on the first arm carries a first tensioner pulley biased against a first belt run adjacent the second drive pulley that is slack during engine starting. A second tensioner pulley carried on the second arm is biased against a second belt run adjacent the second drive pulley that is taut during engine starting A hydraulic strut connected to the second arm, and preferably included in the preassembled unit, provides moderate biasing for the second tensioner pulley during normal engine operation and velocity sensitive resistance, to increased belt forces, that limits reactive movement of the second tensioner pulley during engine starting and transient engine operation.

REFERENCES:
patent: 5531648 (1996-07-01), Meckstroth et al.
patent: 6322470 (2001-11-01), Markley et al.
patent: 6652401 (2003-11-01), Liu
patent: 2002/0039944 (2002-04-01), Ali et al.
patent: 2002/0086751 (2002-07-01), Bogner et al.
patent: 2004/0014542 (2004-01-01), Quintus
patent: 2008/0020876 (2008-01-01), Tanaka
patent: 3652177 (2005-05-01), None

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