Constant mesh gear box



Constant mesh gear box
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 so between the second gear and cutch gear and another is between the first gear and reverse gear. Splines are out on main shaft so that all the gears are feed on it.
Dog clutches can also slide on main shaft and rotate with it. However, all the gears on counter-shaft are giddily fixed to it. Different gear ratios are obtained as follows:
For three forward and one reverse gear
Top or 3rd speed gear is obtained when the left dog clutch is slided to left to mesh with clutch gear by using the gear shift lever. In this case, main shaft rotates at the maximum speed. Speed ratio obtained is 1:1.
Second gear is obtained when dog clutch meshes with second gear. In this condition clutch gear rotates the drive gear on counter shaft and counter shaft drives the second gear on the main shaft. All other gears on main shaft are free , so they do not move.
In the same manner, first gear is obtained when right hand side dog clutch meshes with first gear. Reverse gear is obtained when right side dog clutch meshes with reverse gear on main shaft.
Advantage of constant mesh gear box:
Since all the gears are in constant mesh, wear and tear of gears and possible damage of gears do not occur in engaging and disengaging gears. Also, any sounds are not generated in engaged/disengaged.


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