333Positive baulk pin synchromesh unit

Movement of the selector fork synchronizing sleeve to the left (Fig. 3.7(a and b)) forces the female (internal) cone to move into contact with the male (external) cone on the drive gear. Frictional torque will then synchronize (unify) the input and output speeds. Until speed equalization is achieved, the collars on the three thrust pins (only one shown) will be pressed hard into the enlarged position of the slots (Fig. 3.5(c)) in the synchronizing sleeve owing to the frictional drag when the speeds are dissimilar. Under these conditions, unless extreme pressure is exerted, the dog teeth cannot be crushed by forcing the collars into the narrow portion of the slots. However, when the speeds of the synchromesh hub and drive gear are equal (synchronized) the collars tend to 'float' in the enlarged portion of the slots, there is only the pressure of the spring loaded balls to be overcome. The collars will then slide easily into the narrow portion of the slots (Fig. 3.5(d)) allowing the synchronizer hub dog teeth to shift in to mesh with the dog teeth on the driving gear.

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