360 Modena gear box manual - All Ferraris

Synchronisers
Synchronisation details for gear engagement are illustrated in figures 3 and 4.
The sliding sleeve (A) has an inner toothing, which engages with the gear's (C) coupling element
(B), thereby rigidly connecting it to the synchroniser unit (D) splined on the shaft.
Moving the sleeve (A) axially, the synchroniser ring (E) is driven simultaneously with it by means of
the pressure blocks (F). These are pushed against the ring by the balls (N), held up in the grooves
of the sleeve by the spring clamps (G). This allows the sliding sleeve to move.
The Reverse gear synchroniser, UP TO gearbox no. 10297, does not have pressure blocks (F) the
function of which, together with that of the ball, is carried out by special rollers (F1).
The concave surface of the synchroniser ring therefore, adheres to the correspondent convex
surface of the intermediate ring or of the coupling element.
Due to the slight caster angle between the two tapered surfaces, radial forces are generated on the
gear (C), which, by causing it to rotate, counteract the differences of spin velocity between the gear
to be engaged (C) and the synchroniser body (D), and therefore between the shaft and the gear.
As soon as synchronism between the parts is obtained, there is a further movement of the sleeve
which, engaging on the gear's coupling element, brings about the definitive coupling between the
gear (C) and the synchroniser body (D).