Gearchange - Principle

Principle (see Pl. 24-25)

After the selection of a gear by the driver (by moving the manual gear lever), all the "human" operations are replaced by hydraulic actions; the gear box and the clutch remain traditional.

Changing from one gear to another is carried out in the following order:

- deselection of the gears,

- declutching,

- synchronised selection of the gears (excluding First and Reverse which should not be selected unless the car is stopped),

- re-engagement of the clutch.

All this is done with the assistance:

- of a clutch mechanism with its disengagement control: slave cylinder,

- of a gearbox fitted with a top cover incorporating hydraulic actuating cylinders,

- of a hydraulic block including:

- the hydraulic sets connected to the gear lever's mechanism

- the servo-hydraulic controls,

- the automatic control of the clutch (which includes a low-pressure pump),

- additional devices of regulation:

- corrector of re-engagement of the clutch

- flow regulator

- of a corrector of idle speed.