Patent ID: 8978500
Filing Date: 2015-03-17
Classification: F16H,Y10T

Abstract:
1. An hydraulic pressure supply apparatus for a dual clutch type automatic transmission having an input shaft connected to a drive shaft of a prime mover mounted on a vehicle through a torque converter with a lockup clutch, first and second secondary input shafts installed in parallel with the input shaft, an output shaft connected to a wheel, first and second clutches for connecting the input shaft to the first and second secondary input shafts upon being supplied with hydraulic pressure, a plurality of odd-numbered pairs of gear groups installed at the first secondary input shaft, a plurality of even-numbered pairs of gear groups installed at the second secondary input shaft, and a gear selecting mechanism adapted to select one of the plurality of the odd-numbered pairs of the gear groups and the plurality of the even-numbered pairs of the gear groups upon being supplied with hydraulic pressure to establish an odd-numbered speed or even-numbered speed, the transmission changing an output of the prime mover in speed through the established speed and transmitting it to the wheel through the output shaft, comprising: a hydraulic pump adapted to be driven by the prime mover and to draw up operating oil from a hydraulic pressure source and discharge the operating oil; a regulator valve adapted to regulate discharged pressure discharged from the hydraulic pump to a line pressure; first and second switching valves adapted to supply hydraulic pressure to the first and second clutches respectively; a first hydraulic control valve adapted to supply the regulated line pressure to the lockup clutch through a third switching valve connected to an output port of the first hydraulic control valve; a first electromagnetic valve connected to operating ports of the first and third switching valves; and a second electromagnetic valve connected to operating ports of the second and third switching valves, wherein the first and second electromagnetic valves are adapted to switch among the first, second and third switching valves upon being energized and deenergized.