184000308 - INTRODUCTION - MANUAL GEARBOX AND DIFFERENTIAL
CONSTRUCTION FEATURES
The structure of the gearbox consists of:
- a gearbox casing which contains and supports the main and layshafts, gear selector forks and shafts and the gear selector and engagement device;
- a rear cover which contains the 5th speed gears and the rear bearing retaining plate for the main and layshafts
- a bell housing which contains the clutch, the thrust bearing and the control linkage.
Main shaft
The main shaft consists of:
- 1st , 2nd and reverse gears fitted directly on the shaft;
- 3rd , 4th and 5th speed gears fitted on the shaft.
Layshaft
The layshaft consists of:
- 1st , 2nd , 3rd , 4th and 5th gears fitted on the shaft
The layshaft is supported on:
- a front roller bearing
- a rear ball bearing
Gears
The gears are the following type:
- helical toothed for the forward speeds
- straight toothed for reverse.
Synchronizers
The synchronizers for the forward speeds are the Borg-Warner type.The arrangement for the synchronizers is the split type because the synchronizers for the 1st and 2nd speeds are fitted on the layshaft, whilst those for the 3rd, 4th and 5th speeds are on the main shaft.This solution reduces gearbox noise in neutral from the moment 3 of the 5 (or 6) pairs of gears are not driven.In addition, the engagement and synchronization loads are reduced as a result of the corresponding reduction in the inert masses rotating downstream of the crankshaft.Differential
On the C.510 and C.514 gearboxes, the differential unt is located at the rear of the gearbox casing.It consists of:
- a crown wheel and pinion reduction
- a differential housing constructed in a single piece which includes the planet and satellite gears.
1, Thrust bearing2, Speedometer gear3, Planet gears4, Conical roller bearing5, Satellite gears6, Ring gear7, Conical roller bearing8, Differential housing bearing adjustment shim9, Layshaft10, Main shaft.
1, Thrust bearing2, Main shaft3, Satellite gears4, Planet gears5, Ring gear6, 1st speed driven gear.7, 2nd speed driven gear.8, Gearbox casing9, 3rd speed driven gear10, 4th speed driven gear11, Rear bearing retaining plate12, 5th speed driven gear.13, Layshaft14, Rear cover5th speed drive gear16, Bell housing