Title:
無段変速機の油圧制御装置
Document Type and Number:
Japanese Patent JP4380768
Kind Code:
B2
Abstract:
A hydraulic control system of continuously variable transmission includes: a first sheave pressure regulating valve (17) that regulates a line pressure (Pl), which is used for hydraulic control as a source pressure, to obtain a first sheave pressure (Pin); a fail-safe valve (19) that selects and outputs any one of the first sheave pressure (Pin) or a fail-safe hydraulic pressure (second sheave pressure Pout) that is applied to a drive pulley (21) at the time of a failure due to an excessive first sheave pressure (Pin) to the drive pulley (21); and an orifice (25) that is provided in an oil passage (24) between the fail-safe valve (19) and the drive pulley (21). Then, a hydraulic pressure in the oil passage (24) on the drive pulley (21) side of the orifice (25) is supplied to the first sheave pressure regulating valve (17) as a feedback pressure.
Inventors:
Yusuke Ogata
Toshihiro Aoyama
Toshihiro Aoyama
Application Number:
JP2007337678A
Publication Date:
December 09, 2009
Filing Date:
December 27, 2007
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F16H61/00; F16H9/00; F16H61/12; F16H61/66; F16H59/68; F16H61/662
Domestic Patent References:
| JP2005163869A | ||||
| JP2006316819A |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda