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Power flow - Drive and manual 3
In Drive and Manual 2, transmission drive is via the input shaft and forward clutch cylinder.
The elements of the transmission function as follows;
· The C2 clutch is engaged to drive the forward sun gear.
· The C1 clutch is engaged to drive the planet carrier.
· The short pinion drives the long pinion clockwise.
· The forward sun gear and the planet carrier are driv-en clockwise at the same speed
therefore there is no relative motion between the sun gear and the pinions.
· The ring gear and output shaft are driven in a clockwise or forward direction at input shaft
speed.
· The C4 clutch is applied to bypass the 3-4 OWC and provide engine braking on overrun.
Control
To maintain this arrangement in the steady state solenoids and valves are activated as follows:
· Solenoid S1 is switched OFF. S2 is switched OFF.
· With S1 and S2 switched OFF, the 2-3 and 3-4 shift valves are held in the third gear position
by line pressure.
· The 1-2 shift valve is held in the third gear position by S1-S2 oil pressure.
· 2nd oil (line pressure) from the 1-2 shift valve is directed 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 ratio) to the Band Apply Feed (BAF) circuit.
· Band apply feed oil is directed to;
- The outer apply area of the front servo
- The 1-2 shift valve to provide an exhaust port when the transmission is shifted to first gear
- The 3-4 shift valve for use when the transmission is shifted into fourth 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 pressure multiplied by
the valve ratio) to the Clutch Apply Feed (CAF) circuit.
The CAF oil is directed to;
- The C1clutch
- The 4-3 sequence valve
· At the 4-3 sequence valve the CAF oil becomes Band Release Feed (B1R-F) oil, and is
directed through the 3-4 shift valve to the spring end of the 4-3 sequence valve, and to the
release side of the front servo piston to hold band OFF.
· Drive (line pressure) is routed through the 3-4 shift valve to apply the C4 clutch.
BATRA 4-SPEED AUTO TRANSMISSION
REXTON.04
