3022459 - 1820B HYDRAULIC CLUTCH SYSTEM
INTRODUCTION
The clutch release takes place through a
co-axial hydraulically operated system known as CSC. This type of
system, which incorporates the hydraulic actuator with the thrust
bearing, makes it possible to maintain the performance throughout
the working life of the clutch and reduce the noise and vibrations
from the pedal.CONSTRUCTION FEATURES
The CSC system is defined as co-axial because
the release actuator consists of an aluminium ring cylinder fitted
inside the bell housing between the gearbox and the clutch mechanisms
in a position which is co-axial in relation to the main shaft.The advantage of the CSC system compared
with traditional systems is that there are no kinematic couplings
which results in improved reliability and functionality and make
the system easy to maintain. The system has the following features:
- constant adjustment of the clutch pedal height;
- effort applied to the pedal constant over a period of
time;
- elimination of clutch pedal return difficulties;
- reduction in the noise and vibrations from the pedal
through the action of a damper on the cylinder fluid pipe.
The pipe is connected to the actuator by
a rapid connector with a bleed valve incorporated.The absence of the traditional system idler
crank mechanism, the adoption of a clutch pump with a plastic casing
and piston and the use of plastics for the construction of the pedal
assembly has also made it possible to greatly reduce the noise and the
overall weight of the system.OPERATION
CSC hydraulic actuator cylinder
VIEW OF ASSEMBLY1 - Fluid inlet pipe
2 - Expansion chamber
3 - Piston
4 - Thrust bearing
5 - Threaded locking flange
6 - O-ring
7 - Anti-wear pads
8 - Rubber mounting
9 - Spring
10 - Guide pipeThe release of the clutch takes place through
the action of the clutch pump which sends fluid under pressure,
through the pipe (1), to the expansion chamber (2). The pressure
of the fluid causes the movement of the piston (3) which slides
in the guide tube (10) by means of plastic anti-wear pads (7). The
piston is in one piece with the thrust bearing (4) which presses against
the pressure plate springs disconnecting the clutch. When the pressure
of the fluid ceases, the actuator returns to the rest position through
the action of the pressure plate springs.An oil seal and O-ring (6) prevent gearbox
fluid leaking into the clutch housing.There are rubber bellows (8), kept in position
by a spring (9), as protection against the intake of outside agents.CLUTCH RELEASE PUMP
VIEW OF CLUTCH PUMP1 - Casing
2 - Steel cylinder
3 - Piston
4 - Gasket
5 - Piston stop fork
6 - Protection
7 - Operating stem
8 - Fluid inlet
9 - CSC actuator fluid supplyThe clutch release pump has been designed
with the casing and piston made from plastic to reduce the weight;
the operating stem secured (T interface) to the piston. There is
a steel cylinder, inside the casing in the area of the piston seals,
to prevent wear and distortions due to pressure.The piston is prevented from escaping by
a stop V-fork, whilst a protection prevents the build up of dirt
inside the cylinder.The top and bottom end-of-travel stops of
the piston in the pump casing also determine the top and bottom
end positions of the pedal.
