Construction and Function of Gear Shifting Mechanisms.
Gear Shifting Mechanisms
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8.
Hub sleeve function
To prevent the gear from jumping out, the spline between the hub sleeve and the speed gear is tapered to form a chamfer shape and improve the meshing of the hub sleeve and speed gear. For the same purpose, the teeth of the input, idler, and reverse gears are also slightly tapered.
On some transmissions, splines of different thicknesses have been used where the gears fit into the hub sleeve to increase the meshing pressure of the hub sleeve and gears, and prevent the transmission jumping out of gears.
SERVICE HINT: If the hub sleeve spline chamfer portion is worn, the transaxle jumps out of gear.
