Power Flow - Drive 4 (Overdrive) - SSANGYONG Musso Sports N100 2003 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.
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The B1 band is applied to hold the reverse sun gear stationary.
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As the planet carrier tuns, the long pinion 'walks' around the stationary reverse sun gear and rotates around its
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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.
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The C2 clutch is engaged to reduce the speed differential across the 3-4 OWC.
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Control
To maintain this arrangement in the steady state solenoids and valves are activated as follows:
Solenoid S1 is switched On. S2 is switched Off.
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With S1 switched On the 3-4 shift valve is held in the fourth gear position by line 500 pressure on the small end
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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
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end of the valve.
The 1-2 shift valve is held in the fourth gear position by S2 oil pressure.
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2nd oil (line pressure) from the 1-2 shift valve is directed to the band apply regulator valve, and to the 2-3 shift
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valve.
The band apply regulator valve supplies 2nd oil (regulated to line pressure multiplied by the valve ratio) to the
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band apply feed (BAF) circuit.
Band apply feed oil is directed to:
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- 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.
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3rd oil from the 2-3 shift valve is directed to the clutch apply regulator valve, and to the 4-3 Sequence Valve.
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The clutch apply regulator valve supplies oil (regulated to line 500 pressure multiplied by the valve ratio) to the
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clutch apply feed (CAF) circuit.
The CAF oil is directed to:
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- the C1 clutch
- the C1 bias valve
- the 4-3 sequence valve
Drive oil (line pressure) from the manual valve engages the C2 clutch
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Refer to figure 5.8 and table 5.9.
Table 5.9 - Engaged Elements - Drive 4 (Overdrive)
Gear State
Drive 4 (Overdrive)
C1 C2
C3
X X
-
AUTOMATIC TRANSMISSION 5A-57
ELEMENTS ENGAGED
B1
C4
B2
OWC
- X
-
1-2 3-4 LU
OWC CLUTCH
- X -