Title:
HYDRAULIC CIRCUIT FOR TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION
Document Type and Number:
Japanese Patent JP3698931
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress and prevent the hydraulic circuit from occurring so that the oil chamber of a forward reverse clutch mechanism is momentarily filled at a high set oil pressure during a low temperature or the clutch mechanism is engaged in a short time, and to suppress and prevent output shaft torque from being momentarily increased.
SOLUTION: A forward clutch choke 251 provided with a choke throttle having a long throttle route is located in an oil passage through which a clutch pressure PFWD/C is fed to the oil chamber 604 of a forward clutch mechanism 6. A choke suppresses a flow of working oil to the oil chamber during a low temperature at which viscosity of the working oil is high and lengthens a time in which an oil chamber is filled, whereby engagement in a short time of the clutch mechanism 6 is suppressed and an instantaneous rise of output shaft torque is prevented from occurring. Further, since during a normal temperature, viscosity of the working oil is decreased and the choke is functioned as an orifice, the clutch mechanism is smoothly engaged through the working of an accumulator.
Inventors:
Takeo Yoshida
Application Number:
JP27985599A
Publication Date:
September 21, 2005
Filing Date:
September 30, 1999
Export Citation:
Assignee:
JATCO Co., Ltd.
International Classes:
F16D48/06; F16D48/08; F16H15/38; F16H61/00; F16H61/06; F16H59/72; F16H61/664; (IPC1-7): F16H61/00; F16H15/38
Domestic Patent References:
| JP7305752A | ||||
| JP9217805A | ||||
| JP1229149A | ||||
| JP62063252A |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu
Yoshiaki Naito
Cui Shu Tetsu