The device operation is produced in the following form:

As was indicated, the connector block rotates solidary with the engine while the eccentric makes it with the input shaft of the gearbox. When one of these parts turns to different speed that the other, the eccentric will slip on the skates of the pistons, pushing to some and releasing to other successively. Then the pistons are displaced within the cylinders, some toward within and other outward. This at the same time provokes the pumping of oil between some cylinders and others. In this way, the liquid that it is expelled of some cylinders passes immediately to the others cylinders with less hydraulic pressure (by not to act on its pistons the eccentric), applying to its pistons against the eccentric. The hydraulic compensation of the circuit maintains at all times the skates in touch with the eccentric. The three centrifugal valves are put between the cylinders, on equal position that these on within the connector block. They are located on the center of each hydraulic channel for control the flow that goes through they.

Each valve is composed of a valve body, and a spring that pushes it to the position more internal.

When the engine rotates to idle speed, the bodies G are maintained in the position more internal due to the pressure of the springs, and letting pass all the liquid flow that pump the pistons. In these conditions the torque transmitted by the connector block on the eccentric is very small, therefore both parts are decoupled.

When the number of revolutions of the engine rises by above of the idle, the valves are expelled progressively outside of the connector block for the centrifugal force, defeating the opposition that exercise the springs. Then the valves begin to cover progressively the hydraulic channels, and reduce the flow until cutting it thoroughly when reach the position more external. This provokes a fort hydraulic overpressure within the cylinders that pump, something, which prevents that increase the slippage speed. Then it starts the gradual coupling between the eccentric and the connector block that finishes with the eccentric and the connector block rigidly coupled.

This situation will stay while the speed of both will be superior to the idle. When this speed falls so much that is about to the idle, the bodies of the valves return gradually to the interior position, opening again the flow of the hydraulic liquid. This provokes the gradual decoupling between the eccentric and the connector block. Both bodies remain thoroughly decoupled when the engine speed, and by so much the connector block speed, falls until the idle.

Antonio Sánchez 1997-2007. Málaga (Spain).