Working of constant mesh gear box:
A simplified diagram of constant mesh gear box has been shown in Figure. In this gear box, all gears on the main transmission shaft are constantly connected to corresponding gears on counter shaft or lay shaft.
In addition, two dog clutches are provided on the main shaft. One dog clutch is between the third gear and clutch gear and another is between the first (Low) gear and second gear.
Top or 4th speed gear is obtained when the left dog clutch is shifted to left to mesh with clutch gear by using the gear shift lever. In this case, main shaft rotates at the same speed as that of clutch gear or engine crankshaft speed which is the maximum speed.
Third gear is obtained when dog clutch (left side) meshes with third gear on main shaft. In this way by sliding the second dog clutch, second and first gears are obtained.
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