APPLY COMPONENTS CONSTRUCTION [5R55S]
id0513c1321200
Clutch/Band Operation
• The apply components of the 5R55S transmission work together to provide a flow of power.
• The coast clutch is applied to provide coast braking in manual 1GR, manual 3GR and manual 4GR. Coast braking occurs without the use of the coast clutch in manual 2GR and in 5GR.
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Position/Range
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R
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D
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D
(O/D OFF)
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3
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2
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1
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Planetary component
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Gear position
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Reverse
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1GR
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2GR
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3GR
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4GR
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5GR
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Manual 4GR
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Manual 3GR
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Manual 2GR
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Manual 1GR
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Overdrive band
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A
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A
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A
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OS
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Intermediate band
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A
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A
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FRS
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Low/reverse band
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A
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A
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A
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RP
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Coast clutch
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A
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A
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A
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OS
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Direct clutch
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A
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A
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A
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A
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FRS
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Forward clutch
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A
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A
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A
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A
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A
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A
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A
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A
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A
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FR
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Overdrive one-way clutch
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Drive
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H
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H
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OR
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H
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H
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OR
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H
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H
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OR
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H
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OS
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Coast
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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Low/reverse one-way clutch
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Drive
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H
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H
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OR
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OR
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OR
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OR
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OR
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H
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H
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RP
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Coast
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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OR
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A :Applied
H :Holding
OR :Overrunning
OS :Overdrive sun gear
RP :Reverse planetary carrier component
FRS :Forward/reverse sun gear
FR :Forward ring gear
Overdrive Band
• The overdrive band connects the overdrive sun gear to the transmission case.
• The overdrive band is applied in 2GR and 5GR, as well as in manual 2GR.
• During 2GR and 5GR operation, hydraulic pressure is applied to the overdrive servo.
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― This pressure causes the piston to move and apply force to the band.
― This action causes the overdrive band to hold the overdrive drum.
― This causes the overdrive sun gear to be held stationary through the adapter plate and the overdrive drum.
Overdrive One-Way Clutch
• The overdrive one-way clutch connects the input shaft to the center shaft during drive operation.
• The overdrive one-way clutch transmits torque in Reverse, 1GR, 3GR and 4GR, as well as in manual 3GR.
• The direct one-way clutch is a sprag-type one-way clutch that is pressed into the center shaft.
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― The overdrive one-way clutch is driven by the ring gear of the overdrive planetary carrier.
― The overdrive one-way clutch holds and drives the outer splines of the center shaft in 1GR, 3GR, 4GR and Reverse gears.
― The overdrive one-way clutch overruns during all coast operations and at all times in 2GR and 5GR.
Coast Clutch
• The coast clutch connects the overdrive planetary carrier component to the overdrive sun gear.
• The coast clutch is applied in manual 1GR, manual 3GR, manual 4GR (D range O/D OFF mode) and Reverse positions.
• The coast clutch is a multi-disc clutch made up of steel and friction plates.
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― The coast clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
― The coast clutch is housed in the overdrive drum.
― When applied, the coast clutch locks the overdrive sun gear to the overdrive planetary carrier, thus preventing the one-way clutch from overrunning when the vehicle is coasting.
― This allows the use of engine compression to help slow the vehicle and provide engine braking.
Intermediate Band
• The intermediate band connects the forward/reverse sun gear to the transmission case.
• The intermediate band is applied in 3GR, as well as in manual 3GR.
• During 3GR operation, hydraulic pressure is applied to the intermediate servo.
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― This pressure causes the servo to move and apply force to the intermediate band.
― This action causes the direct clutch drum to be held.
― The intermediate band holds the intermediate brake and direct clutch drum to the case in 3GR.
― This causes the input shell and forward sun gear to be held stationary.
Direct Clutch
• The direct clutch connects the center shaft to the forward/reverse sun gear.
• The direct clutch is applied in Reverse, 4GR and 5GR, as well as in manual 4GR (D range O/D OFF mode).
• The direct clutch is a multi-disc clutch made up of steel and friction plates.
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― The direct clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
― It is housed in the direct clutch drum.
― During 4GR, 5GR and Reverse gear application, the direct clutch is applied transferring torque from the forward clutch cylinder to the direct clutch drum.
― This action causes the forward sun gear to drive the pinions of the low/reverse planetary carrier.
Forward Clutch
• The forward clutch connects the center shaft to the forward ring gear.
• The forward clutch is applied in all forward gears.
• The forward clutch is a multi-disc clutch made up of steel and friction plates.
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― The forward clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
― When applied, the forward clutch provides a direct mechanical coupling between the center shaft and the forward ring gear and hub.
Low/Reverse Band
• The low/reverse band connects the reverse planetary carrier to the transmission case.
• The low/reverse band is applied in Reverse, as well as in manual 1GR and manual 2GR.
• During 2GR operation, 1GR operation and Reverse, hydraulic pressure is applied to the low/reverse servo.
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― This pressure causes the servo to move and apply force to the low/reverse band.
― This action causes the low/reverse brake drum to be held.
― This action causes the low/reverse planetary assembly to be held stationary.
Low/Reverse One-Way Clutch
• The low/reverse one-way clutch connects the reverse planetary carrier to the transmission case during drive operation.
• The low/reverse one-way clutch transmits torque in 1GR and 2GR, as well as in manual 1GR and manual 2GR.
• The low/reverse one-way clutch is a sprag-type one-way clutch.
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― The low/reverse one-way clutch holds the low/reverse drum and low/reverse planetary assembly to the case in 1GR and 2GR.
― In all other gears the low/reverse one-way clutch overruns.
