The clutch release system has a coaxial hydraulic control combined with a device for the recovery of the clutch plate wear which allows the load on the clutch pedal to remain constant throughout the life of the vehicleThe clutch release shaft, the bushes, the clutch release external lever and the clutch control cylinder (actuator) are eliminated with this type of control.The system is known as co-axial because the release actuator consists of an aluminium ring cylinder, fitted inside the clutch bellhousing, positioned between the gearbox and the clutch mechanisms, co-axially in relation to the main shaft.The advantage of this system compared with conventional systems lies in the absence of kinematic couplings resulting in improved reliability and functionality, making it easy to maintain. The system features the following characteristics:- constant adjustment of the clutch pedal setting;- constant force applied to the pedal over a period of time;- elimination of any difficulties with the clutch pedal return;- reduction in the noise and vibrations transmitted by the pedal.The connection of the pipe to the actuator is produced by means of a rapid connector with an integrated bleed and "clip" type attachments for quick and easy release/reattachment for maintenance operations.The absence of the traditional system idler crank and the adoption of plastic materials for the construction of the pedal assembly has also allowed a considerable reduction in noise and the overall weight of the system.In particular the clutch pump has undergone a considerable improvement compared with the components usually adopted; it is equipped with:- plastic casing with a further contribution to the reduction in the weight;- steel cylinder;- plastic material piston.The material of the piston and the rubber seals have been developed specifically to operate with long strokes; in addition the seal produced by the rubber-steel contact is excellent compared with traditional type clutch pumps where the seal was produced on cast iron.The clutch release takes place through the action of the clutch pump which sends oil, under pressure, via the pipe (4), into the expansion chamber. The pressure of the oil causes the movement of the piston which slides in the guide pipe through the teflon anti-wear pads. The piston is in one piece with the thrust bearing which presses on the pressure plate springs thereby releasing the clutch. As the pressure of the oil ceases, the actuator returns to the rest position through the effect of the pressure plate springs.The seal against any oil leaks that could emanate from inside the bellhousing is guaranteed by an oil seal and an O-ring.
1. Clutch casing2. Main shaft3. Hydraulic clutch actuator4. Fluid pipe
SELF-ADJUSTING CLUTCH
The clutch has a clutch plate wear recovery device known as SAC.
1. Movement spring2. Compensation ring3. Cover4. Load sensor5. Travel restricter6. Diaphragm springThe mechanism rests on knurled tilted planes (2). When there is wear, 3 springs (1) cause the seal to rotate which is raied guaranteeing the recovery of the clearance.This device basically offers the following advantages:- lasts 50% longer than a traditional clutch;- limited release forces that remain constant for the entire duration;- constant position of the clutch pedal;- restriction of noise and vibrations;- reduced dimensions for engines with high torque.
TWIN MASS FLYWHEEL
On diesel versions the flywheel is dual mass damping type consisting of two masses, one integral with the crankshaft and the other with the gearbox mainshaft, via the clutch plate. A flexible torsional damping system is created between these two masses with a system of springs (positioned in parallel) with differential stiffness. This main feature of this type of flywheel is its ability, unlike a normal flywheel, to alter the torsional resonance speed to below the engine service speed.This type of flywheel damps torque fluctuations in two stages to reduce power transmission vibration and roughness in a more effective and targeted manner.
