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In an automatic transmission comprising a fluid type torque converter having an input member including a pump vane wheel and an output member including a turbine vane wheel, and an auxiliary transmission having one or plural stages of gear trains through which the torque of said output member is tra

In an automatic transmission comprising a fluid type torque converter having an input member including a pump vane wheel and an output member including a turbine vane wheel, and an auxiliary transmission having one or plural stages of gear trains through which the torque of said output member is transmitted to driving wheels, a lock-up control device for a torque converter in an automatic transmission for vehicle comprising a hydraulic direct coupling clutch having a slip characteristic provided between the input and output members of the torque converter and capable of mechanically coupling said both members and a modulator valve disposed in an oil passage for connecting an oil pressure cylinder of said direct coupling clutch with an oil pressure source, said modulator valve being composed of a valve body for opening and closing said oil passage, a spring for biasing said valve body in a valve-opening direction, a first oil pressure chamber for introducing pilot oil pressure for biasing said valve body in a valve-closing direction from an input port side of said modulator valve, and a second pilot oil pressure chamber for introducing pilot oil pressure for biasing said valve body in the valve-opening direction, wherein an output side of a device for generating oil pressure proportional to vehicle speed for releasing oil pressure which is changed proportional to the vehicle speed is connected through a throttle to said second pilot oil pressure chamber and a valve device for detecting the idle state of an engine throttle valve to release said second pilot oil pressure chamber to atmosphere is connected to said second pilot oil pressure chamber.

대표청구항 ▼

In an automatic transmission comprising a fluid type torque converter having an input member including a pump vane wheel and an ouput member including a turbine vane wheel, and an auxiliary transmission having one or plural stages of gear trains through which the torque of said output member is tran

In an automatic transmission comprising a fluid type torque converter having an input member including a pump vane wheel and an ouput member including a turbine vane wheel, and an auxiliary transmission having one or plural stages of gear trains through which the torque of said output member is transmitted to driving wheels, a lock-up control device for a torque converter in an automatic transmission for vehicle comprising a hydraulic direct coupling clutch having a slip characteristic provided between the input and output members of the torque converter and capable of mechanically coupling said both members and a modulator valve disposed in an oil passage for connecting an oil pressure cylinder of said direct coupling clutch with an oil pressure source, said modulator valve being composed of a valve body for opening and closing said oil passage, a spring for biasing said valve body in a valve-opening direction, a first oil pressure chamber for introducing pilot oil pressure for biasig said valve body in a valve-closing direction from an input port side of said modulator valve, and a second pilot oil pressure chamber for introducing pilot oil pressure for biasing said valve body in the valve-opening direction, wherein an output side of a device for generating oil pressure proportional to vehicle speed for releasing oil pressure which is changed proportional to the vehicle speed is connected through a throttle to said second pilot oil pressure chamber and a valve device for detecting the idle state of an engine throttle valve to release said second pilot oil pressure chamber to atmosphere is connected to said second pilot oil pressure chamber.