Power Flow - Drive 4 (Overdrive) - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

Power flow - Drive 4 (Overdrive)

In Drive 4 (Overdrive), transmission drive is via the input
shaft to the forward clutch cylinder.
The elements of the transmission function as follows;
• The C1 clutch is applied to drive the planet carrier
clockwise.
• The B1 band is applied to hold the reverse sun gear
stationary.
• As the planet carrier tuns, the long pinion walks around
the stationary reverse sun gear and rotates around its
axis driving the internal ring gear and output shaft in a
clockwise or forward direction at a speed faster than
the input shaft i.e. in overdrive ratio.
• The forward sun gear is also driven faster than the input
shaft and overruns the 3-4 OWC.
• The C2 clutch is engaged to reduce the speed differ-
ential across the 3-4 OWC.
Control
To maintain this arrangement in the steady state sole-
noids and valves are activated as follows;
• Solenoid S1 is switched ON. S2 is switched OFF.
• With S1 switched ON, the 3-4 shift valve is held in the
fourth gear position by line 500 pressure on the small
end of the valve.
• With S2 switched OFF, the 2-3 shift valve is held in
the fourth gear position by line 500 pressure on the
large end of the valve.
Gear State
Drive 4 Overdrive
BTRA 4 AUTO TRANSMISSION
REXTON SM - 2004.4
C1 C2 C3
X X -
• The 1-2 shift valve is held in the fourth gear position by
S2 oil pressure.
• 2nd oil (line pressure) from the 1-2 shift valve is di-
rected to the band apply feed regulator valve, and to
the 2-3 shift valve.
• The band apply feed regulator valve supplies 2nd oil
(regulated to line pressure multiplied by the valve ra-
tio) to the Band Apply Feed (BAF) circuit.
• Band apply feed oil is directed to;
- the outer apply area of the front servo
- the inner apply area of the front servo piston via the
3-4 shift valve
- the 1-2 shift valve to provide an exhaust port when
the transmission is shifted to first gear
• 2nd oil at the 2-3 shift valve is directed to the 3rd oil
circuit.
• 3rd oil from the 2-3 shift valve is directed to the clutch
apply regulator valve, and to the 4-3 sequence valve.
• The clutch apply regulator valve supplies oil (regu-lated
to line 500 pressure multiplied by the valve ratio) to
the Clutch Apply Feed (CAF) circuit.
• The CAF oil is directed to;
- the C1 clutch
- the 4-3 sequence valve
• Drive oil (line pressure) from the manual valve en-gages
the C2 clutch.
ELEMENTS ENGAGED
C4 B1 B2
- X -
3A2-35
1-2 3-4 LU
OWC OWC CLUTCH
- - -
Y220_3A2460
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN