Patent ID: 7282005
Filing Date: 2007-10-16
Classification: F16H

Abstract:
1. A hydraulic control apparatus of an automatic transmission comprising: a common oil path for supplying a line pressure; a predetermined hydraulic servo operable to control an engaging state of a frictional engaging element on the basis of a supplied oil pressure; a control pressure output element; a first oil path which diverges from said common path to supply said control pressure output element with the line pressure, said control pressure output element comprising a solenoid valve and is operable to output control pressure supplied to the predetermined hydraulic servo by adjusting the line pressure; a switching valve; a second oil path which diverges from said common path to supply said switching valve with the line pressure, said switching valve is operable to input said control pressure and said line pressure supplied from said second oil path and operable to output said control pressure or said line pressure supplied from said second oil path to said predetermined hydraulic servo by selectively switching; and a flow rate regulating element disposed in said second oil path, the flow rate regulating element is operable to regulate a flow rate of said second oil path for inputting said line pressure to said switching valve.