TYPES OF GEAR BOX

PROGRESSIVE TYPE GEAR BOX:
Usually this gear boxes are used in motor cycles. In this gear boxes the gears pass through the intervening speeds while shifting from one speed to another. There is a neutral position between two positions. These gear boxes are a combination of sliding and constant mesh gear boxes. The various gear speeds are obtained by sliding the dog clutch or gear to the required position.

EPICYCLIC (OR) PLANETARY TYPE GEAR BOX:
The epicylic or planetary type transmission uses no sliding dogs or gears to engage but different gear speeds are obtained by merely tightening brake-bands on the gear drums, which simplify gear changing. A planetary gear set consists of ring gear or annular wheel, sun gear and planet gears with carrier. In order to obtain different speeds any one of these three units can be held from rotation by means of brake bands.w

SELECTIVE TYPE GEAR BOX
It is the transmission in which any speed may be selected from the neutral position. In this type of transmission neutral position has to be obtained before selecting any forward or reverse gear. Some selective type gear boxes are,
(i) Sliding mesh gear box
(ii) Constant mesh gear box
(iii) Synchromesh gear box