Travel adjusted clutch (TAC)
Design and function of a travel adjusted clutch
| Item | Description |
|---|---|
| 1 | Clutch lining |
| 2 | Clutch lining wear |
| 3 | Ramp ring |
| 4 | Pinion/spindle drive |
| 5 | Drive pawl |
| 6 | Mechanical freewheel |
The system provides a way of compensating clutch lining wear. This is accomplished with the aid of a pinion/spindle drive and a ramp ring between the Belleville washer and pressure plate.
The lining wear is compensated by turning the ramp ring. The installation position of the Belleville washer and the actuation forces remain constant.
The ramp ring is driven by the pinion/spindle drive via a positive connection. The pinion is not driven if there is no wear.
The drive pawl engages in the next tooth and drives the pinion, which compensates the wear.
A mechanical freewheel locks the position of the pinion.
Construction of the ramp ring
| Item | Description |
|---|---|
| 1 | Compression springs |
| 2 | Ramp ring |
| 3 | Ramp |
| 4 | Clutch housing |
The illustration shows the layout of the ramp ring.
The compression springs turn the ramp ring anti-clockwise. The ramp ring is shown raised from its normal position for clarity.