AB60F AUTOMATIC TRANSMISSION

CONSTRUCTION

The planetary gear unit consists of three planetary gear units, four clutches, four brakes, and four one-way clutches.

A centrifugal fluid pressure canceling mechanism is used in the C1, C2, C3, and C4 clutches that are applied when shifting 2nd → 3rd, 3rd → 4th, 4th → 5th, and 5th → 6th.

*1	Input Shaft	*2	Intermediate Shaft
*3	Sun Gear	*4	Front Planetary Gear
*5	Center Planetary Gear	*6	Rear Planetary Gear
*7	Output Shaft	-	-

FUNCTION OF COMPONENTS

Component		Function
C1	No. 1 Clutch	Connects the input shaft, F4 and intermediate shaft.
C2	No. 2 Clutch	Connects the input shaft and center planetary carrier.
C3	No. 3 Clutch	Connects the input shaft and sun gear.
C4	No. 4 Clutch	Connects the input shaft and intermediate shaft.
B1	No. 1 Brake	Prevents the front planetary carrier from turning either clockwise or counterclockwise.
B2	No. 2 Brake	Prevents the front and the center ring gears from turning either clockwise or counterclockwise.
B3	No. 3 Brake	Prevents outer race of F2 from turning either clockwise or counterclockwise.
B4	No. 4 Brake	Prevents center planetary carrier and the rear ring gear from turning either clockwise or counterclockwise.
F1	1-Way Clutch	Prevents the front planetary carrier from turning counterclockwise.
F2	No. 2 1-Way Clutch	When B3 is operating, the one-way clutch prevents the front sun gear from turning counterclockwise.
F3	No. 3 1-Way Clutch	Prevents the center planetary carrier and the rear ring gear from turning counterclockwise.
F4	No. 4 1-Way Clutch	Prevents the intermediate shaft from turning counterclockwise.
Planetary Gears		These gears change the route through which driving force is transmitted, in accordance with the operation of each clutch and brake, in order to increase or reduce the output shaft speed.

TRANSMISSION POWER FLOW

Shift Lever Position		Solenoid Valve
Shift Lever Position		S1	S2	S3	S4
P		-	On	On	-
R*		-	On	On	-
N		-	On	On	-
D, S6	1st	-	On	On	-
	2nd	On	On	On	-
	3rd	On	-	On	-
	4th*	On	-	-	-
	5th*	On	-	-	On
	6th*	On	On	-	On
S5	1st	-	On	On	-
	2nd	On	On	On	-
	3rd	On	-	On	-
	4th*	On	-	-	-
	5th*	On	-	-	On
S4	1st	-	On	On	-
	2nd	On	On	On	-
	3rd	On	-	On	-
	4th*	On	-	-	-
S3	1st	-	On	On	-
	2nd	On	On	On	-
	3rd*	On	-	On	-
S2	1st	-	On	On	-
S2	2nd*	On	On	On	On
S1	1st*	-	On	On	-

*: with engine brake

Shift Lever Position		Solenoid Valve
Shift Lever Position		SR	SL1	SL2	SLU
P		On	-	On	-
R*		On	-	On	-
N		On	-	On	-
D, S6	1st	On	-	On	-
	2nd	On	-	On	On
	3rd	On	-	On	On
	4th*	On	-	On	On
	5th*	-	On	-	On
	6th*	-	On	-	On
S5	1st	On	-	On	-
	2nd	On	-	On	On
	3rd	On	-	On	On
	4th*	On	-	On	On
	5th*	-	On	-	On
S4	1st	On	-	On	-
	2nd	On	-	On	On
	3rd	On	-	On	On
	4th*	On	-	On	On
S3	1st	On	-	On	-
	2nd	On	-	On	On
	3rd*	On	-	-	On
S2	1st	On	-	On	-
S2	2nd*	On	-	-	On
S1	1st*	On	-	-	-

*: with engine brake

Shift Lever Position		Clutch
Shift Lever Position		C1	C2	C3	C4
P		-	-	-	-
R*		-	-	○	-
N		-	-	-	-
D, S6	1st	○	-	-	○
	2nd	○	-	-	○
	3rd	○	-	○	○
	4th*	○	○	●	○
	5th*	●	○	○	-
	6th*	●	○	-	-
S5	1st	○	-	-	○
	2nd	○	-	-	○
	3rd	○	-	○	○
	4th*	○	○	●	○
	5th*	●	○	○	-
S4	1st	○	-	-	○
	2nd	○	-	-	○
	3rd	○	-	○	○
	4th*	○	○	●	○
S3	1st	○	-	-	○
	2nd	○	-	-	○
	3rd*	○	-	○	○
S2	1st	○	-	-	○
S2	2nd*	○	-	-	○
S1	1st*	○	-	-	○

○: Operates

●: Operates but is not related to power transmission

*: with engine brake

Shift Lever Position		Brake
Shift Lever Position		B1	B2	B3	B4
P		-	-	-	-
R*		○	-	-	○
N		-	-	-	-
D, S6	1st	-	-	-	-
	2nd	-	-	○	-
	3rd	-	-	●	-
	4th*	-	-	●	-
	5th*	○	-	●	-
	6th*	●	○	●	-
S5	1st	-	-	-	-
	2nd	-	-	○	-
	3rd	-	-	●	-
	4th*	-	-	●	-
	5th*	○	-	●	-
S4	1st	-	-	-	-
	2nd	-	-	○	-
	3rd	-	-	●	-
	4th*	-	-	●	-
S3	1st	-	-	-	-
	2nd	-	-	○	-
	3rd*	▲	-	●	-
S2	1st	-	-	-	-
S2	2nd*	-	▲	○	-
S1	1st*	-	-	-	▲

○: Operates

●: Operates but is not related to power transmission

▲: Operates during engine braking

*: with engine brake

Shift Lever Position		One-way Clutch
Shift Lever Position		F1	F2	F3	F4
P		-	-	-	-
R*		○	-	-	-
N		-	-	-	-
D, S6	1st	-	-	○	○
	2nd	○	○	-	○
	3rd	○	-	-	○
	4th*	-	-	-	○
	5th*	-	-	-	-
	6th*	-	-	-	-
S5	1st	-	-	○	○
	2nd	○	○	-	○
	3rd	○	-	-	○
	4th*	-	-	-	○
	5th*	-	-	-	-
S4	1st	-	-	○	○
	2nd	○	○	-	○
	3rd	○	-	-	○
	4th*	-	-	-	○
S3	1st	-	-	○	○
	2nd	○	○	-	○
	3rd*	○	-	-	○
S2	1st	-	-	○	○
S2	2nd*	○	○	-	○
S1	1st*	-	-	○	○

○: Operates

*: with engine brake

1st Gear (D Position or S Mode)


*1	Operates
*2	Operates only in the S1 range

2nd Gear (D Position or S Mode)


*1	Operates
*2	Operates only in the S2 range

3rd Gear (D Position or S Mode)


*1	Operates
*2	Operates only in the S3 range
*3	Operates but is not related to power transmission

4th Gear (D Position or S Mode)


*1	Operates
*2	Operates but is not related to power transmission

5th Gear (D Position or S Mode)


*1	Operates
*2	Operates but is not related to power transmission.

6th Gear (D Position or S Mode)


*1	Operates
*2	Operates but is not related to power transmission

Reverse Gear (R Position)

*1 Operates

CENTRIFUGAL FLUID PRESSURE CANCELING MECHANISM

For the following reason, the centrifugal fluid pressure canceling mechanism is used on the C1, C2, C3, and C4 clutches.

Clutch shifting operation is affected not only by the valve body controlling fluid pressure but also by centrifugal fluid pressure that is present due to fluid in the clutch piston oil pressure chamber. The centrifugal fluid pressure canceling mechanism has chamber B to reduce this affect applied to the chamber A. As a result, smooth shifting with excellent response has been achieved.

*1	Piston	*2	Chamber A (for C1)
*3	Chamber A (for C4)	*4	Chamber B
*5	C1 Clutch	*6	C4 Clutch