transaxle manual transmission

what is a manual transmission ? a manual transmission got a range of gears (5 speed) that the driver must shift from gear to gear allowing the engine speed to change. normally bolts to a clutch housing, the input shaft connect to the back of the crank.

 
comonent parts

first we disassembling the manual transmission

selector lever

selector lever is there which you can selects gears by moving the shift rails and forks

forks and shift rails

The forks and shift rail are used to select the gear when you change gears, it is loacted internals of the transmission housing inside the detents to the synchromesh sleeve.

 
  interlock

a metal interlock prevents the two shift forks from moving, the interlock also prevents the finger from selecting a gear if any of the shift rails is moved from the neutral position.





detent

the detent is a hardened steel ball and spring like the picture it against a groove or dent in the shift rails shown in the picture. it keeps the tramission in gear and lets the driver know that a gear has been selected.





gears uses in manual transmission
Helical gears teeth are cut in an angle, when the two teeth on the helical gear engane it starts at one end of the tooth and gradually spreads as the gears rotate. most gears in the manual transmission have helical type of gears

Spur gears is very common type of gears, the teeth on them are stright and are mounted on a parallel shafts. many spur gears are used at once to make a large gear reductions. the spur gears are cheap to make and can be really loud also it increases the stress on the gears teeth.

 

SYNCHROMESH

the parts of the synchromesh unit are

• baulk ring 
• insert spring 
• inserts
• hub and sleeve alignment marks
• sleeve

why you need a sychromesh in a tramsmission is because when your changing gears the synchromesh parts synchronizes slow down the speed of the gearr being selected with the input shaft. the avaertgest is that it easy gear shifting, faster gear shifting and reduce damage to the engaging teeth of the gears

Shafts in manual transmission

input shaft - its connect to the clucth to the output stright through to the gearbox 

 reverse and  idler shaft - the idler drives the mainshaft this gear changes the direction of the rotation of the gears to provide reverse.

mainshaft -  its transmit drive through the dog teeth gears which carries the drive to the driveshaft

Countershaft  - this connects input and output shaft thats is driven from the main shaft rotates the opposite rotation to the input shaft

  
bearing

taper rolling bearings

needle roller bearings

vertical needle roller bearings

 GEAR RATIO

to a speed ratio as opposed to a torque ratio
GEAR RATIO = TEETH IN DRIVEN GEAR / TEETH IN DRIVING GEAR

Rear wheel drive automatic transmission

day one one Tuesday  we got introduced to a auto transmission (rear)  by Brian. we started stripping the transmission to all the parts.

 the torque converters was explained to us by Brian, its got three main parts 

cover = its hold everything together

turbine = driven member

impeller = driving member

stator = got a one way clutch inside

the torque converter is like a mechanical clutch it is bolted to a flex plate, the flex plate is like a flywheel.

 it works by the engine crank shaft driving the impeller by the centrifugal force, and the vanes, the transmission fluid is forces out into the turbine side of the torque converter that makes that spin. the torque converter is full with transmission oil inside. the oil go thought the impeller in the same way as the impeller is routing  

Valve body

the valve body controls the transmission the brain of automatic transmission. it connects to the oil pump, servo, clucth ,torque converter.There are two general types of valves, valves act on the shift valves at opposing ends of the valve to control the point at which

the transmission will shift gear.

Planetary gears

used for changing gear ratio in auto-transmission, there are three main parts the sun gear, planet carrier and pinions and ring gear that the pinion gears is connect to the sun gear and ring gear.ach of these three components can be the input, the output or can be held stationary.

 

bands

the band is a steel strap with material bonded (like a clucth plate) to the inside surface of the band which are used to  hold the clutch gear sets. the servo control the band and allow pressure to tighten the band around the drum so the drum stops turning.

servo

servos is controlled by hydraulically valve body and that are apply pressure to the bands which

hold the drums together.

Input shaft

a input shaft transmit the power from the engine to the torque converter throw to transmission.

 One-way clutch

a one way clutch is there so it allows a part like a ring gear to turn one way but not in the other freely

. you can find a one way clucth place in first gear when is in driven position, one way clucth also called a sprag clutch.

oil pump

a transmission oil pump is driven by the torque converter from the input shaft. the gear teeth's goes together that force the fluid through the outlet. the pump is used to provide fluid  to lubricate  the gears set continuous fluid to the torque converter operating, and a cooling system. there is three kind of gears : rotor type, gear type and vane type.

Governor

the governor proved pressure by hydraulic fluid controls its related to the road speed by the governor pressure.

 It is connected to the output, so the faster the car moves, the faster the governor spins

 

clutch pack/clutch plates

a clutch pack has the 2 sun gears inside it, which mesh in with the pinions inside the planetary gears that works by hydraulic fluid pressure.