What is difference between synchromesh and sliding mesh gearbox?

Answer 1

Sliding mesh - This is where the gears are not in constant mesh

with each other and the gears on the main shaft slide over to mesh

with the gears on the lay shaft/counter shaft.

Synchromesh - the problem with constant mesh is that the gears

crash into each other when changing gear because there travelling

at different rpms (one at engine speed and the other a lot slower)

They dont line up properly when spinning and when they go to mesh

they end up grinding.

So the awnser is Synchromesh which uses Baulk rings to lock onto

the gear first before the sliding sleeve comes over to lock on.

Difficult to explain how it works but basically its a smooth gear

change.

Answer 2

Sliding mesh - This is where the gears are not in constant mesh with each other and the gears on the main shaft slide over to mesh with the gears on the lay shaft/counter shaft.

Synchromesh - the problem with constant mesh is that the gears crash into each other when changing gear because there travelling at different rpms (one at engine speed and the other a lot slower) They dont line up properly when spinning and when they go to mesh they end up grinding.

So the awnser is Synchromesh which uses Baulk rings to lock onto the gear first before the sliding sleeve comes over to lock on. Difficult to explain how it works but basically its a smooth gear change.