HYDRAULIC CONTROL DEVICE FOR BELT TYPE CONTINUOUSLY VARIABLE SPEED CHANGE GEAR FOR VEHICLE

PURPOSE:To provide high response by a method wherein a speed change direction switching valve regulates a speed ratio through ON and OFF of a first solenoid, and a gesr shifting speed switching valve suppresses a change on the speed decrease side through ON of a second solenoid and a change on the speed increase side through OFF thereof. CONSTITUTION:A speed change control device 260 performs duty control of a first solenoid valve 266, a spool 280 of a speed change direction switching valve 262 is lowered through ON of a first solenoid 265 to change the speed ratio of a continuously variable speed change gear to the speed decrease side, and the spool is raised to change a speed ratio to the speed increase side. A gear shifting speed switching valve, i.e., a flow rate control valve 264, is switched so that a spool 288 is risen through ON of a second solenoid 267 of a second solenoid valve 268, and a change of a speed ratio to the speed increase side is not suppressed but a change to the speed decrease side is suppressed, the spool is lowered through OFF of the second solenoid, and a change thereof to the speed increase side is suppressed and a change thereof to the speed decrease side is not suppressed. This constitution provides high response although a valve is small, and enables improvement of durability against duty drive.