| 摘要 |
A device for regulating the operation of the transmission of a motor vehicle having a variator including a distributor which is influenced by a centrifugal regulator and/or resilient means which may be additionally controlled by an accelerator, for supplying pressure fluid from a source to a cylinder chamber or for connecting the chamber to a reservoir, a piston movable in said cylinder chamber being connected to a step-down control element of the variator. As a safety device to prevent imbalance in the event of a failure of the centrifugal regulator, a two-piston electrically operated valve is incorporated between said source and said chamber, the valve being controlled by an electrical circuit arranged to close the valve and prevent the flow of pressure fluid from the source to the chamber if the speed of the engine exceeds a predetermined value. If desired, the valve may serve to control flow of pressure fluid to and from a hydraulic brake for the input shaft of the variator.
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