Powerchain-Transmission •Why transmission must be used in combustion powerplant?
•MT
•AMT
•CVT
•Step AT
•DCT
1
MT
•Driver should change the gear by stepdown the clutch pedal and stick shift.
MT
MT (future)
•In China absolute number is still increasing, but market share (currently 70-80%) will be down gradually due to automatic transmission is becoming popular
AMT
•AMT: Automated Manual Transmission •Price between 4000-6000RMB, big shift shock
•Many experts forecasted that AMT will disappear firstly
CVT (Continuous Variable Transmission) Very popular in niche market.
1)About 38% market share of total automatic transmission market in Japan
(1) Jatco is playing the main role, several million annual volume
2) No share in USA
(1) Ford ever developed CVT more than 10 years ago, failed (Managa
participated ever)
3)Several points of hundred percentage in Europe, will out of phase soon
(1) Punch CVT-1 and CVT-2, for china customers, Haima, Southeast, GW;
for Mini cooper.
(2) Audi Multi-tronic for Audi A4, Audi A6; will be replaced by DCT
(3) Benz A class; will be replaced by DCT
CVT (Continuous Variable Transmission)•Advantages and Disadvantages
1)so-called fuel economy ??
2)Drive comfortability-> real no step automatic transmission
3)Torque range from 110 –400Nm -> due to belt/chain limited
proprietary
4)Too depending on belt (Bosch) and chain(Luk)
5)belt/chain are easier to be worn -> high oil consumption with time
going
6)Acceleration is not strong -> belt/chain non-robust
7)High hydraulic line pressure supplied by Pump for belt/chain ->
high oil consumption
CVT (Continuous Variable Transmission)•Belt type
Friction Coefficient of belt and pulley under different CVTF
CVT (Continuous Variable Transmission)•Chain Type
CVT -Japan market status •Japan market status
Continuously variable principle
Jatco new CVT
Jatco new CVT
Jatco new CVT
Jatco new CVT
Step AT
•Step AT came to the world already over 50 years, mainstream in the worldwide.•Current mainstream is Step 6AT.
•8AT is already gone into market.
•9AT even 10 AT is coming in next 2 years.•Individual opinion: Step AT will be absolute mainstream in China market due to mature technology and relative low threshold.
Cross Section of Step AT
Torque Converter –lockup ON
Torque Converter –lockup OFF
Torque Converter function
8HP TC
OWC
Planetary Gear System
Clutch system
CBLR
CB1234
Planetary 1
Planetary 2
Planetary 3
ZF HP Series
ZF HP Series
ZF 8HP
ZF 8HP
Aisin AW F600 (for VW)
Aisin AW Step 8AT FR
DCT
•DCT should be potential stream in China •High threshold for local auto-makers due to Launch clutch and control strategy.•Better fuel economy compared to Step AT •Better acceleration compared to CVT/step AT
•Durability?
•Not suitable for SUV
DCT
Good partner TSI engine
DCT
DCT
DCT
DCT
DCT
DCT
DCT Projects
DCT - Damper
离合器扭矩传递
扭矩从柔性盘/飞轮输入
Torque input from flex plate / flywheel
外离合器扭矩传递
内离合器扭矩传递
扭矩从柔性盘/飞轮输入
Torque input from flex plate / flywheel
。