Hydraulic Operation
POWER TRANSMISSION/HYDRAULIC MECHANISMP/N Position
The driving force of the turbine shaft is transmitted to the reverse and forward drum. None of the clutches are operating, however, so this force is not transmitted to the output gear. Therefore, the vehicle is not in movable condition. The output gear is locked because the output shell is mechanically locked by the parking pawl. (P position)
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator. Line pressure (7) driven to the manual valve is not transmitted to any path. Line pressure (7) driven to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
R Position (Above Approximately 30 km/h (19 MPH))
The driving force of the turbine shaft is transmitted to the reverse and forward drum, and then to the large sun gear through the reverse clutch, causing the large sun gear to rotate counterclockwise. This force, however, will not be transmitted to the output, because the low and reverse brake is not engaged. Therefore, the planetary carrier idles.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator. Line pressure (7) driven to the manual valve is transmitted to (6), which engages the reverse clutch through the orifice check valve and N-R accumulator. Line pressure (6) also works on the pressure regulator valve, causing an increase in line pressure (7). Because the shift solenoid A is ON, the low and reverse brake dose not engage. The line pressure (7), driven to the pressure regulator valve, is transmitted to the torque converter pressure (23) and sent to torque converter through the torque converter clutch shift valve.
R Position (Below Approximately 4 km/h (2.5 MPH), Above Approximately 5 km/h (3 MPH))
The driving force of the turbine shaft is transmitted to the reverse and forward drum, and then to the large sun gear through the reverse clutch, causing the large sun gear to rotate counterclockwise. The pinion gear of the planetary gear, however, does not revolve around the large sun gear because the planetary carrier is locked by the low and reverse brake. As a result, the large sun gear causes the long pinion gear to rotate clockwise. This rotation causes the internal gear to rotate clockwise, followed by a clockwise rotation of the output gear. This driving force is transmitted to the driving wheels.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator. Line pressure (7) driven to the manual valve is transmitted to (6), which engages the reverse clutch. Line pressure (6) also engages the low and reverse brake through the orifice check valve and N-R accumulator. Line pressure (6) also works on the pressure regulator valve, causing an increase in line pressure (7). Line pressure (7) driven to pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
First Gear
The driving force of the turbine shaft is transmitted to the reverse and forward drum and then to the one-way clutch outer race through the forward clutch. One-way clutch 1 transmits this driving force to the small sun gear, causing the gear to rotate counterclockwise.
The internal gear, integral with the output gear (namely the driving wheels) does not rotate as a result of load while the vehi6le is stopped. Therefore, one-way clutch 2 prohibits the planetary carrier from revolving around the sun gear clockwise together with the clockwise rotation of the large sun gear.
As a result, the short and long pinion gears of the planetary gear rotate clockwise and cause the internal gear to rotate counterclockwise by overcoming the load of the stopped vehicle.
The output gear rotates counterclockwise, and the driving force is transmitted to the driving wheels.
During deceleration, the small sun gear rotates at a higher speed than the turbine shaft, causing one-way clutch 1 to freewheel.
As a result, reverse torque from the driving wheels is not transmitted to the engine, so the engine brake does not operate.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
This pressure will not be transmitted any further because the shift solenoid A is OFF, the shift solenoid B is ON, and the shift solenoid C is ON.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Second Gear (Power, Normal, Hold: Above Approximately 17 km/h (10.5 MPH ))
The driving force of the turbine shaft is transmitted to the reverse and forward drum and then to the one-way clutch outer race through the forward clutch. One-way clutch 1 transmits this driving force to the small sun gear, causing the gear to rotate counterclockwise.
The large sun gear, however, is locked by the 2-4 brake band and thus does not rotate. The long pinion gear revolves around the large sun gear counterclockwise while rotating on its own axis in the same direction, causing a counterclockwise rotation of the internal gear. As a result, the output gear rotates counterclockwise. This driving force is transmitted to the driving wheels.
During deceleration, engine braking does not operate because one-way clutch 1 freewheels, similar to driving in D range 1GR.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
This pressure will not be transmitted any further because the shift solenoid A and the shift solenoid C are ON.
The activated shift solenoid A causes spring force to press the 1-2 shift valve to the right side, thus transmitting line pressure (1) to (9). This pressure works on the 1-2 accumulator, and then on the 2-4 brake band applied side, engaging the 2-4 brake band.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Second Gear (Hold: Below Approximately 14 km/h 18.7 MPH ))
The drive force of the turbine shaft is transmitted to the reverse and forward drum and causes the small sun gear to rotate counterclockwise through the forward clutch, one-way clutch 1 (sprag type) and coasting clutch.
The large sun gear, however, is locked by the 2-4 brake band and thus does not rotate. The long pinion gear revolves around the large sun gear counterclockwise while rotating on its own axis in the same direction, causing a counterclockwise rotation of the internal gear. As a result, the output gear rotates counterclockwise. This driving force is transmitted to the driving wheels.
During deceleration, the coasting clutch is engaged, making engine braking available.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
The activated shift solenoid A causes spring force to press the 1-2 shift valve to the right side, thus transmitting line pressure (1) to (9). This pressure works on the 1-2 accumulator, and then on the 2-4 brake band applied side, engaging the 2-4 brake band.
With the shift solenoid B ON and the shift solenoid C OFF, line pressure (1) is transmitted to (16) and then to (28), engaging the coasting clutch.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Third Gear (Power, Normal, Hold)
The driving force of the turbine shaft is transmitted to the reverse and forward drum and causes the small sun gear to rotate counterclockwise through the forward clutch, one-way clutch 1 (sprag type) and coasting clutch.
However, during start-up of the second to third gear shifting, the coasting clutch is not yet engaged. Thus, the driving force uses the forward clutch and one-way clutch 1 for the counterclockwise rotation of the small sun gear. This driving force is also transmitted to the planetary carrier through the 3-4 clutch, making it rotate counterclockwise.
As a result because the small sun gear and the planetary carrier rotate counterclockwise at the same speed, the short and long pinion gears revolve integrated with the small and large sun gears and internal gear instead of rotating on their own axis.
The driving force caused by this motion is transmitted to the driving wheels through the output gear. During deceleration, engine braking operates by coasting clutch engagement.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
With the shift solenoid B OFF, the 2-3 shift valve is forced to the left side by line pressure (14), thus transmitting line pressure (3) to (13). Line pressure (13) is transmitted to the bypass valve, to quicken the start-up of the 3-4 clutch application pressure. when the path from (13) to (18) in the bypass valve closes, line pressure (13) goes through the orifice check ball to work on the 2-3 accumulator, slowly increasing 3-4 clutch application pressure.
With the shift solenoid C OFF, the 3-4 shift valve is forced to the left side by line pressure (17). Line pressure (13) is transmitted to (15), and then to the 2-3 timing valve and coast bypass valve, engaging the coasting clutch.
With the shift solenoid A ON, the 1-2 shift valve is forced to the right side by spring force, transmitting the line pressure (1) to (9). Line pressure (9) works on the 1-2 accumulator and the brake band applied side.
However, with line pressure (15) applied to the 2-4 brake released side, the 2-4 brake band is released due to pressure applied to the difference between the surface areas of the band servo pistons.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Third Gear (Torque Converter Clutch Operation)
The driving force of the turbine shaft is transmitted to the reverse and forward drum and causes the small sun gear to rotate counterclockwise through the forward clutch, one-way clutch 1 (sprag type) and coasting clutch.
However, the coasting clutch is not yet engaged during start-up of the second to third gear shifting, so the driving force uses the forward clutch and one-way clutch 1 for the counterclockwise rotation of the small sun gear. This driving force is also transmitted to the planetary carrier through the 3-4 clutch, making it rotate counterclockwise.
As a result, because the small sun gear and the planetary carrier rotate counterclockwise at the same speed, the short and long pinion gears revolve integrated with the small and large sun gears and internal gear, instead of rotating on their own axis.
The driving force caused by this orbital motion is transmitted to the driving wheels through the output gear. During deceleration, engine braking operates by coasting clutch engagement.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the clutch. (3) works on the 2-3 shift valve.
With the shift solenoid B OFF, the 2-3 shift valve is forced to the left side by line pressure (14), thus transmitting line pressure (3) to (13). Line pressure (13) is transmitted to the bypass valve to quicken the start-up of the 3-4 clutch apply pressure. When the path from (13) to (18) in the bypass valve closes, line pressure (13) goes through the orifice check ball to work on the 2-3 accumulator, slowly increasing 3-4 clutch apply pressure.
With the shift solenoid C OFF, the 3-4 shift valve is forced to the left side by the line pressure (1 7).Thus, line pressure (13) is transmitted to (15) and then to the 2-3 timing valve and coast bypass valve, engaging the coasting clutch. With the shift solenoid A ON, the 1-2 shift valve is forced to the right side by spring force, transmitting line pressure (1) to (9). Line pressure (9) works on the 1-2 accumulator and the brake band applied side.
However, with line pressure (15) applied to the 2-4 brake released side, the 2-4 brake band is released due to pressure applied to the difference between the surface areas of the band servo pistons.
With the torque converter clutch control solenoid valve ON, the torque converter clutch shift valve moves to the right. The torque converter clutch control shift valve gradual drain torque converter pressure (25) that is applied to the torque converter front chamber.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Fourth Gear (Power, Normal)
The driving force of the turbine shaft is transmitted through the 3-4 clutch to the planetary carrier to rotate it counterclockwise. The large sun gear is fixed by brake band engagement; therefore, the long pinion gear revolves around the sun gear counterclockwise while rotating on its own axis in the same direction, and the short pinion gear revolves around the sun gear counterclockwise while rotating clockwise on its own axis, causing the small sun gear to rotate clockwise.
As a result, the internal gear rotates counterclockwise, and this driving force is transmitted to the driving wheels.
The driving force of the turbine shaft is also transmitted to the one-way clutch outer race through the forward clutch. The rotation speed of the small sun gear (that of the one-way clutch inner race) is higher than that of the one-way clutch outer race. Thus, one-way clutch 1 freewheels and does not transmit power. During deceleration, the engaged 3-4 clutch transmits the rotation speed of the internal gear and planetary carrier to the engine side, and engine braking is obtained.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
With the shift solenoid A ON, the 1-2 shift valve is forced to the right side by spring force, transmitting line pressure (1) to (9). Line pressure (9) works on the 1-2 accumulator and 2-4 brake band applied side, engaging the 2-4 brake band.
With the shift solenoid B OFF, the 2-3 shift valve is forced to the left side by line pressure (14), thus transmitting line pressure (3) to (13). Line pressure (13) is applied to the 2-3 accumulator, and then engages the 3-4 clutch slowly. Because the shift solenoid C is turned ON, the 2-4 brake band release pressure is drained from the 3-4 shift valve, and the coasting clutch apply pressure is drained from the 3-4 shift valve.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.
Fourth Gear (Torque Converter Clutch Operation)
The driving force of the turbine shaft is transmitted to the planetary carrier through the 3-4 clutch to rotate it counterclockwise. The large sun gear is fixed by 2-4 brake band engagement; therefore, the long pinion gear revolves around the sun gear counterclockwise while rotating on its own axis in the same direction, and the short pinion gear revolves around the sun gear counterclockwise while rotating clockwise on its own axis, causing the small sun gear to rotate clockwise.
As a result, the internal gear rotates counterclockwise, and this driving force is transmitted to the driving wheels.
The driving force of the turbine shaft is also transmitted to the one-way clutch outer race through the forward clutch. The rotation speed of the small sun gear (that of the one-way clutch inner race) is higher than that of the one-way clutch outer race. Thus, one-way clutch 1 freewheels and does not transmit power.
During deceleration, the engaged 3-4 clutch transmits the rotation speed of the internal gear and planetary carrier to the engine side, and engine braking is obtained.
Hydraulic Pressure Operation
Line pressure (7) generated in the oil pump is adjusted by the pressure regulator valve and transmitted to the manual valve, solenoid reducing valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, torque converter clutch shift valve, 1-2 accumulator, 2-3 accumulator, N-D accumulator, and N-R accumulator.
Line pressure (7) delivered to the manual valve is transmitted to (1) and (3). (1) works on the 1-2 shift valve, 3-4 shift valve, and N-D accumulator, and engages the forward clutch. (3) works on the 2-3 shift valve.
With the shift solenoid A ON, the 1-2 shift valve is forced to the right side by spring force, transmitting line pressure (1) to (9). Line pressure (9) works on the 1-2 accumulator and 2-4 brake band applied side, engaging the 2-4 brake band.
With the shift solenoid B OFF, the 2-3 shift valve is forced to the left side by line pressure (14), thus transmitting line pressure (3) to (13). Line pressure (13) is applied to the 2-3 accumulator, and then engages the 3-4 clutch slowly. Because the shift solenoid C is turned ON, the 2-4 brake band release pressure is drained from the 3-4 shift valve, and the coasting clutch application pressure is drained from the 3-4 shift valve.
With the torque converter clutch control solenoid valve ON, the torque converter clutch shift valve moves to the right. The torque converter clutch control shift valve gradually drain torque converter pressure (25) that is applied to the torque converter front chamber.
Line pressure (7) delivered to the pressure regulator valve is transmitted to torque converter pressure (23) and sent to the torque converter through the torque converter clutch shift valve.