We are currently studying about front wheel drive gear boxes.
The gearbox I was working on today was never opened up before. The external physical condition of the gearbox looked very good, it had no damage or cracks.
When I opened the rear case, I saw the fifth gear driver and driven gear. I unbolted the nuts on the gears. Now, the gears did not come out easily. I used a three legged puller to remove the gear from its place.
I opened all the remaining bolts, and also i had to remove the plunger from the selector interlock mechanism. A few bolts inside the bell housing had to be removed as well for the gearbox body assembly to dismantle fully apart.Gearbox Operation
In the front wheel drive gearbox, there are two main shafts, the primary and secondary (Input and output shafts).
When for example, the first gear is selected, the 1st & 2nd gear shfit fork which is holding the 1st & 2nd syncro sleeve is moved over the 1st gear driven dog teeth which than connects the 1st gear driver gear.The Synchromesh
A synchro is a device that allows the dog gear to come to a speed matching the helical gear before the dog teeth attempt to engage. In this way, you don’t need to ‘blip’ the throttle and double-clutch to change gears because the synchro does the job of matching the speeds of various gearbox components for you.
Types of gears
The most basic type of gear is called a spur gear, and it has straight-cut teeth, where the angle of the teeth is parallel to the axis of the gear. Wider gears and those that are cut for smoother meshing are often cut with the teeth at an angle, and these are called helical gears. Because of the angle of cut, helical gear teeth have a much more gradual engagement with each other, and as such they operate a lot more smoothly and quietly than spur gears. Gearboxes for cars and motorbikes almost always use helical gears because of this.
