MAUNAL and AUTOMATIC transmissions

The purpose of manual and automatic transmissions is basically same. they accomodate require torque at the specific speed needed.

top picture shows manual transmissions and bottom one is automatic transmission.
The differences between manual and automatic transmissions are -
*Manual transmissions

1. They let the drive to select a suitable gear ratio to increase the speed to match the load requirement.
2. They allows driver to select neutral and disconnect drive. And also to select reverse gear.

which means they let the driver to go faster, slower and reverse by changing the gear.

*Automatic transmissions
 : These gear box can automatically change gear ratios as the behicle moves, and let the driver feel from having to shift gears manually.

Manual gear box has three types.

• spur toothed gears :  usually used for reverse gear however it's not used frequently and for long period.
• helical toothed gears :  used in most gear boxes because of increased wtrenth, durability, quietness and moedrate cost.
• herringbone toothed gears : seldom used in automotive applications due to high cost.

Purpose of detent mechanism

1. accurately locate the selector rails in their correct position
2. provide a positive "feel" to the gearshift, so the driver is awaer of which gear is selected.
3. it prevents the gears moving out of mesh when there is little of no load on them

And i think this is the most important mechanism of the gear box. that is interlock mechanism.
the purpose of it is that interlock prevents the engagement of more than one gear at a time. which mean once the gear is selected by driver, it hold the gear not to moving or going to nuetral.

Above all, i really enjoy every classes because everything is new to me. tried to get in to it and do it to know more.