automotive session 1
TRANSCRIPT
Automotive
AutomotiveTransmission
K vector foundation16Manual transmission and Transaxle
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K vector foundation16 Back to history
-Purpose-Origin-Development
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K vector foundation16 Improved design
K vector foundation16Types of gears
Spur gearSpur rack gearHelical gearHelical rackSpiral Bevel gearStraight Bevel gear
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-Spur gear
-Helical gear
K vector foundation16Spur GearsAdvantagesThey are cheap and easy to design and manufacture
They can transmit a large amount of power
Disadvantages
They are slow gear speed
They produce a lot of noise when they operate at high speed
They wear at high rate
K vector foundation16 Helical gearsAdvantages
They Operate smoothly and quietly
They wear at low rate
The longer teeth increasing contact area for higher loads.
Disadvantages
They are expensive compared with the spur gears They produce more heatLateral force (lose power)
Types of meshing
External meshing
Internal meshing
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Gear Train
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Final Gear Ratio
Not just one ratio, but multiplied ratios
Constant product ratio X The speed ratio
K vector foundation16As differential ratio is constant in each car so we can change speed by changing the gear ratio in the transmission system Gearratio1st2.97:12nd2.07:13rd1.43:14th1.00:15th0.84:16th0.56:1reverse-3.38:1
Note: the gear ratio is one ratio in transaxle while 2 multiplied ratios in manual transmission
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Any question ?
K vector foundation16Manual Transmission
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-input shaft -output shaft-counter shaft-gears-Synchronizer Main componentsK vector foundation16
K vector foundation16Manual Transmission Gearbox
GEARBOX
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First gear (reduction) : Smallest gear in input to largest gear in output so has the loosest ratio
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2nd gear (reduction)
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3rd gear (reduction)
K vector foundation164th gear (direct shift): the speed of input shaft = that of output shaft
K vector foundation165th gear (overdrive)
K vector foundation16Reverse
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Synchronizer
Video 1
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Manual Transaxle Gearbox
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Video 2
K vector foundation16Trans. (RWD) vs Transaxle (FWD)
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Transmission2 ratios + the differential ratioTransaxle1 ratio + axle ratioNote: All ratios are multiplied to get the final drive ratio
RWDFWDBetter weight distributionBear more load (exert more torque) UndersteeringLess Energy loseLess Expensive (less moving particles)Oversteering
Relative comparisonK vector foundation16
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Shifting Mechanism
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