| 摘要 |
An oil-hydraulic circuit of a continuous belt variable speed-change transmission including primary and secondary variable pulleys, in which at the time when a failure occurs in a solenoid valve, the line pressure of a necessary minimum level is ensured through increasing the oil-hydraulic operating fluid supplied to a secondary pulley. On the other hand, the discharge side of a regulator valve and a primary pulley are maintained in a state of mutual communication to thereby make the speed-change ration equal to or smaller than 1. Also, when the oil pressure supplied to the secondary pulley has increased up to a prescribed, or higher than prescribed level, this oil pressure that is supplied thereto is reduced by means of a second outlet valve. As a result of this, in the oil-hydraulic circuit, even when a failure occurs in the control circuit, the safety of driving of the vehicle is reliably ensured with a simple construction of the oil-hydraulic circuit.
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