Control system and continuously variable transmission provided therewith
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 20, 2004
Grant Date -
Sep 19, 2002
app pub date -
Dec 21, 2001
filing date -
Dec 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for a continuously variable transmission provided with a first pulley (1) having two pulley discs (5, 7), with a second pulley (2) having two pulley discs (6, 8) and with a drive belt (10) wound around said pulleys (1, 2) for transmitting torque there between, at least one disc (7) of the first pulley (1) being axially movable with respect to the other disc (5) of the pulley (1) under the influence of an axial force provided on the movable disc (7) by a line pressure (P.sub.LP) in a cylinder (11) of a piston/cylinder assembly (11, 13) associated with the the first pulley (1) and at least one disc (6) of the second pulley (2) being axially movable with respect to the other disc (8) of the pulley (2) under the influence of an axial force provided on the movable disc (8) by a second cylinder pressure (P.sub.2CP) in a cylinder (12) of a piston/cylinder assembly (12, 14) associated with the the second pulley (2). The control system is arranged to control the second cylinder pressure (P.sub.2CP) between two pressure levels (P.sub.LP ; P.sub.R) by a second valve (32) that may be influenced not only by a control pressure (P.sub.C), but also by the second cylinder pressure (P.sub.2CP).
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