Tri-cone timing mechanism (1st and 2nd gears)
Pic. 3.56. Tri-cone timing mechanism (1st and 2nd gears)
Tri-cone timing mechanism consists of three locking rings (outer, middle and inner) and gears, as well as a sliding hub, cams and a synchronizer cage. The outer and inner races, sliding hub, cams and synchronizer sleeve constantly rotate with the gearbox output shaft. The middle ring and pinion constantly rotate with the transmission gears. When shifting gears, the synchronizer cams pass between the outer and middle rings, then between the middle and inner rings, and finally between the inner ring and gear. As a result, the rotation of the gear and the synchronizer sleeve is synchronized and a smooth engagement of the gears is ensured.
Double cone timing mechanism (reverse gear)
Pic. 3.57. Double cone timing mechanism (reverse gear)
When reverse gear is engaged, the synchronizer cage moves to the left (see picture), dragging the blocking ring with it. The locking ring moves the inner ring to the left, synchronizing the rotation of the gears and ensuring smooth engagement of the reverse idle gear. However, when the 5th gear synchronizer is in operation, only the rotation of the middle and outer rings is synchronized.
Gear selection and shift mechanism
Pic. 3.58. Gear selection and shift mechanism
Ease of gear shifting is ensured by the installation of a counterweight on the select and shift shaft and the use of sliding ball bearings.