Hydraulically controllable constant speed drive and method for the design thereof
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United States of America Patent
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Feb 13, 2007
Grant Date -
Jan 22, 2004
app pub date -
Jun 29, 2001
filing date -
Jun 30, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulically controllable constant speed drive, includes an input shaft (10) provided with an input pulley (1), an output shaft (20) provided with an output pulley (2) and a drive belt (3). Each pulley (1; 2) is provided with two pulley sheaves (11, 12; 21, 22) that are mutually axially displaceable under the influence of a hydraulic pressure to be exerted in a piston-cylinder assembly (14, 15; 24, 25) associated with the pulley (1, 2) and that define a tapered groove of variable axial width wherein the drive belt (3) is accommodated. An input spring (17) is provided that realizes an axial force urging the pulley sheaves (11, 12) of the input pulley (1) towards each other to prevent slip of the drive belt (3) when the hydraulic pressure is negligible.
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