Clutch drive device

Clutch drive cable, with an anti-friction tube in the cable sheath to reduce friction losses. On the first VAZ-2108 cars, a drive was installed with a gap between the clutch release bearing and the pressure spring and with a servomechanism. Since the end of 1986, the servomechanism has been excluded from the clutch drive, and later on front-wheel drive vehicles, a backlash-free drive began to be used, in which there is no gap between the clutch release bearing and the pressure spring petals. The new drive design made it possible to reduce the full travel of the pedal, provide a more precise clutch disengagement and thereby improve the operating conditions of the gearbox synchronizers. With a backlash-free drive, there is no free play and a fixed position of the pedal. The main parameter that determines the normal operation of the clutch actuator is the travel of the clutch pedal. When the pads of the clutch disc are worn, the pedal travel increases and at some point it becomes necessary to adjust the clutch drive.

This chapter describes the servo clutch drive and features of the backlash-free drive device, which is more simple and reliable.

Clutch drive - mechanical, cable, with servo spring 24 (pic. 58), which reduces the force applied to the clutch pedal when it is turned off, and ensures a clear return of the clutch pedal to its original position, that is, it acts as a release spring.




The clutch and brake pedals are suspended on the axis 20 to the bracket 18, which is welded to the front panel of the body and to the air intake box. The pedal hubs have two plastic bushings. A plastic spacer 27 is installed between the brake pedal and the cheek of the bracket on the axle. The clutch pedal is located on the axis between the cheek of the bracket and the thrust washer placed under the head of the pedal axle. The axle is held in the bracket by a locking clip 19.

A servomechanism lever is welded to the clutch pedal, which is pivotally connected to the pusher 26. At the end of the pusher between the thrust washer 25 and the support 23, a pre-compressed spring 24 is installed. The support 23 rests with its protrusion against the socket of the bracket welded to the bracket of the clutch and brake pedals. The lower end of the pusher 26 freely passes through the hole of the support and the bracket.

The upper part of the clutch pedal is connected to the plastic earring 2 of the clutch cable. The cable is located in a sheath, at both ends of which lugs are fixed. The lower tip 8 is clamped in the socket of the bracket 9 by two nuts 6 and 7 with washers and rubber bushings. At the lower end of the cable, a leash 11 is attached, which is connected with a finger to the clutch fork lever. The end of the cable coming out of the sheath is protected by a rubber cover 10. The upper tip 4 of the cable sheath is located in a rubber buffer 3, which end rests against the socket of the front end of the body. The shoulder of the tip rests through the washer against the end of the buffer, which prevents the cable sheath from moving. To maintain the upper branch of the cable, a pull hook with a sleeve 13 is used.

The rubber parts in the clutch drive dampen the vibrations of the parts, reduce vehicle noise and at the same time provide the elasticity of the clutch drive. Therefore, by the force on the clutch pedal, it is sometimes difficult to catch the end of its free play. As a result, the free play is checked and adjusted on the clutch release fork lever.

The backlash-free clutch drive has the following design features (pic. 58b):

• there is no servomechanism in the drive, therefore the clutch pedal does not have a servomechanism lever, and on the bracket of the clutch and brake pedals there is no bracket with a socket for the servomechanism support;
• the clutch pedal is connected to the tip of the cable with a finger and pulled to the extreme forward position by the withdrawal spring 30, as a result of which the clutch release bearing is pressed with a force of 5... 7 kgf to the pressure spring petals. Such an effort does not cause deflection of the pressure spring on the support rings, i.e., clutch slip does not occur;
• in the gearbox bracket, at the place where the cable is attached, rubber bushings and support washers are not installed, and to prevent the cable from coming out of the bracket socket 9, a fixing plate 32 is used;
• there is no return spring at the lever 12 of the clutch fork;
• the cable leash has a persistent antennae A to prevent the leash from disconnecting from the clutch release fork lever;
• rubber buffer 3 is located in a steel cage, which limits its deformation, and hence the travel of the clutch pedal;
• it is not the free travel of the clutch fork lever that is regulated, but the full travel of the clutch pedal.