Valeoscope Commercial Vehicles Clutch 2020

Valeo clutch and actuation for heavy duty

Concentric Slave Cylinder (C.S.C.) The C.S.C. is also a receiver and operates directly on the clutch cover diaphragm. The C.S.C. replaces the clutch release cylinder (C.R.C.) and eliminates the release bearing, the guide tube and the clutch fork from the system. The concentric slave cylinder has a plastic housing and is designed for an operating pressure of up to 40  bar. To gain more space, it is designed in two parts and it is equipped with a steel guide sleeve. This enables small axial and radial sizes. The concentric slave cylinder uses a large coil spring to maintain constant contact between the release bearing and the diaphragm.

Clutch Release Cylinder (C.R.C.) The clutch release cylinder is combined with a mechanical classic gearbox. It is composed of the piston, cups, spring, push rod and covered with a caoutchouc cap. The cap provides protection from dirt, dust and debris from contaminating the push rod and piston.

When the clutch pedal is pressed and the fluid pressure reaches the release cylinder, the piston moves the push rod out to apply force onto the clutch fork which releases the clutch. When the clutch pedal is released, the hydraulic pressure and the force of the return spring pulls back the push rod and sends back the fluid to the master cylinder, therefore engaging the clutch.

Sleeve

Circlip

Spring

Housing

Filter

Outer ring

Sliding sleeve

Sealing ring

Disc

Inner ring

Sensor assembly

Sliding sleeve

Plate spring

Sealing washer

With brake fluid

With mineral fluid

Nr.

Part name

1

tension ring

2

protecting cap

3

retaining ring

4

push rod

5

piston

6

ring

Concentric Slave Cylinder with/without sensor connector

Concentric Slave Cylinder without sensor

7

spring

The concentric slave cylinder has to be replaced at the same time as the clutch. In the case of robotised gearboxes, the actuation is made via an electronic unit associated with a hydraulic power unit, eliminating the clutch pedal. A sensor is attached to the C.S.C. to detect the stroke of the bearing which informs the position of the clutch.

Our C.S.C. equips mainly Mercedes-Benz (until Euro5) and a few MAN medium range of vehicles. The liquid can be either Dot 4, Dot 5, braking fluid or mineral fluid. The efficiency is increased as the deformations under load and the pedal load are reduced. The C.S.C. is concentric to the primary shaft which is an advantage for the truck manufacturer due to a reduced number of components.

8

housing

9

bleeder

10

closure plug

11

ring

12

screw neck

13

closure plug

18

19