Acura RL. Manual - part 219

Fig. 19: Power Flow Diagram - D And D3 Positions (In 4th Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

In 5th gear



Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 5th
gear when the shift lever is in a forward range (D, D3, and M).



Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages the mainshaft 5th gear
with the mainshaft.



The mainshaft 5th gear drives the countershaft 5th gear, which drives the reverse selector hub and the
countershaft.



Power is transmitted to the final drive gear, which in turn drives the final driven gear and the transfer
drive gear.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:11 PM

Page 47



The transfer output shaft drives the transfer hypoid drive gear/shaft and the transfer output shaft (hypoid
gear).



Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 5th gear exceeds that of
1st gear, power from 1st gear is cut off at the one-way clutch.

Fig. 20: Power Flow Diagram - D And D3 Positions (In 5th Gear)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Acceleration in 1st in gear in M (sequential sportshift mode)

In 1st gear in M, hydraulic pressure is applied to the 1st clutch and the 1st-hold clutch. The power flow when
accelerating is as follows:

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:11 PM

Page 48



Hydraulic pressure is applied to the 1st clutch, then the 1st clutch engages the secondary shaft 1st gear
with the secondary shaft by the one-way clutch.



Hydraulic pressure is also applied to the 1st-hold clutch, and the 1st-hold clutch engages the secondary
shaft 1st gear with the secondary shaft.



The mainshaft 3rd gear drives the secondary shaft via the countershaft idler gear and the secondary shaft
idler gear.



The secondary shaft 1st gear drives the countershaft 1st gear and the countershaft.



Power is transmitted to the final drive gear, which in turn drives the final driven gear and the transfer
drive gear.



The transfer output shaft drives the transfer hypoid drive gear/shaft and the transfer output shaft (hypoid
gear).

Fig. 21: Power Flow Diagram - Acceleration In 1st In Gear In M (Sequential Sportshift Mode)

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:11 PM

Page 49

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Deceleration in 1st gear in M (sequential sportshift mode)

The power flow in 1st gear in M (sequential sportshift mode) when decelerating is as follows:



Hydraulic pressure is applied to the 1st clutch and the 1st-hold clutch.



Rolling resistance from the road surface goes through the front wheels to the final drive gear, then to the
countershaft 3rd gear.



The one-way clutch cannot transfer power because the application of torque is reversed.



The force conveyed to the secondary shaft idler gear turns the mainshaft 3rd gear via the countershaft
idler gear. As a result, engine braking can be obtained with 1st gear.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission - RL

Friday, June 05, 2009 1:18:11 PM

Page 50

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