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Home >> Volvo >> 2012 >> C70 >> Repair and Diagnosis >> Engine Performance >> System >> Electronics - Design And Function - 4 Of 4 >> Transmission (M66; 2006-2011) >> Function >> Power Flow
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Power Flow

1st gear 

Fig 1: Identifying Transmission Component Operation For 1st Gear
GLL139990Courtesy of VOLVO CARS CORPORATION
A Input shaft
B Intermediate shaft 1-2, 5-6
4 Ring gear
15 1st-gear gear wheel
19 1st-2nd gear coupling sleeve
20 Final drive 1-2, 5-6
21 1st gear idler wheel

When 1st gear is selected, the coupling sleeve for 1st-2nd gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 1st gear. The coupling sleeve and synchronizing hub lock the idler wheel for 1st gear at the intermediate shaft 1-2, 5-6.

Engine torque is transferred to the input shaft via the clutch. The 1st gear rack on the input shaft transfers the power to the idler wheel for 1st gear. From there power is transferred to intermediate shaft 1-2, 5-6 and to the final drive, which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

2nd gear 

Fig 2: Identifying Transmission Component Operation For 2nd Gear
GLL128681Courtesy of VOLVO CARS CORPORATION
A Input shaft
B Intermediate shaft 1-2, 5-6
4 Ring gear
5 2nd gear idler wheel
14 2nd-gear gear wheel
19 1st-2nd gear coupling sleeve
20 Final drive 1-2, 5-6

When 2nd gear is selected, the coupling sleeve for 1st-2nd gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 2nd gear. The coupling sleeve and synchronizing hub lock the idler wheel for 2nd gear at the intermediate shaft 1-2, 5-6.

Engine torque is transferred to the input shaft via the clutch. The 2nd gear rack on the input shaft transfers the power to the idler wheel for 2nd gear. From there power is transferred to intermediate shaft 1-2, 5-6 and to the final drive, which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

3rd gear 

Fig 3: Identifying Transmission Component Operation For 3rd Gear
GLL128682Courtesy of VOLVO CARS CORPORATION
A Input shaft
C Intermediate shaft 3-4
4 Ring gear
12 3rd-4th gear coupling sleeve
16 3rd gear idler wheel
17 Final drive 3-4
18 3rd-gear gear wheel

When 3rd gear is selected, the coupling sleeve for 3rd-4th gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 3rd gear. The coupling sleeve and synchronizing hub lock the idler wheel for 3rd gear at the intermediate shaft 3-4.

The torque of the engine is transferred via the clutch to the input shaft. The 3rd gear gearwheel on the input shaft transfers the power to the idler wheel for 3rd gear. From there power is transferred on to intermediate shaft 3-4 and to the final drive which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

4th gear 

Fig 4: Identifying Transmission Component Operation For 4th Gear
GLL128683Courtesy of VOLVO CARS CORPORATION
A Input shaft
C Intermediate shaft 3-4
4 Ring gear
10 4th gear idler wheel
12 3rd-4th gear coupling sleeve
13 4th-gear gear wheel
17 Final drive 3-4

When 4th gear is selected, the coupling sleeve for 3rd-4th gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 4th gear. The coupling sleeve and synchronizing hub lock the idler wheel for 4th gear at the intermediate shaft 3-4.

The torque of the engine is transferred via the clutch to the input shaft. The 4th gear gearwheel on the input shaft transfers the power to the idler wheel for 4th gear. From there power is transferred on to intermediate shaft 3-4 and to the final drive which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

5th gear 

Fig 5: Identifying Transmission Component Operation For 5th Gear
GLL128684Courtesy of VOLVO CARS CORPORATION
A Input shaft
B Intermediate shaft 1-2, 5-6
4 Ring gear
6 5th-gear gear wheel
9 Coupling sleeve for 5th-6th gear
11 5th gear idler wheel
20 Final drive 1-2, 5-6

When 5th gear is selected, the coupling sleeve for 5th-6th gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 5th gear. The coupling sleeve and synchronizing hub lock the idler wheel for 5th gear at the input shaft.

The torque of the engine is transferred via the clutch to the input shaft. The 5th-6th coupling sleeve and 5th gear idler wheel, located on the input shaft, transfer the power to the gear wheel for 5th gear. From there power is transferred on to intermediate shaft 1-2, 5-6 and to the final drive which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

6th gear 

Fig 6: Identifying Transmission Component Operation For 6th Gear
GLL128685Courtesy of VOLVO CARS CORPORATION
A Input shaft
B Intermediate shaft 1-2, 5-6
4 Ring gear
7 6th-gear gear wheel
8 Idler wheel for 6th gear
9 Coupling sleeve for 5th-6th gear
20 Final drive 1-2, 5-6

When 6th gear is selected, the coupling sleeve for 5th-6th gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for 6th gear. The coupling sleeve and synchronizing hub lock the idler wheel for 6th gear at the input shaft.

The torque of the engine is transferred via the clutch to the input shaft. The 5th-6th coupling sleeve and 6th gear idler wheel on the input shaft transfer the power to the gear wheel for 6th gear. From there power is transferred on to intermediate shaft 1-2, 5-6 and to the final drive which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

Back-up (reverse) gear 

Fig 7: Identifying Transmission Component Operation For Reverse Gear
GLL128686Courtesy of VOLVO CARS CORPORATION
A Input shaft
B Intermediate shaft 1-2, 5-6
D Back-up (reverse) shaft
1 Final drive for back-up (reverse) gear
2 Idler wheel for back-up (reversing) gear
3 Back-up (reversing) gear coupling sleeve
4 Ring gear
15 1st-gear gear wheel
21 1st gear idler wheel

When back-up (reverse) gear is selected, the coupling sleeve for back-up (reverse) gear is moved by a gear selector fork along the synchronizing hub towards the idler wheel for back-up (reverse) gear.

The coupling sleeve and synchronizing hub lock the idler wheel for back-up (reverse) gear at the back-up (reverse) shaft.

The torque of the engine is transferred via the clutch to the input shaft. The 1st gear gearwheel on the input shaft transfers the power to the idler wheel for 1st gear. From there to the back-up (reverse) gear idler wheel and then to the coupling sleeve for back-up (reverse) gear. From there power is transferred on to intermediate shaft 1-2, 5-6 and to the final drive which in turn transfers the power to the ring gear. The ring gear is connected to the drive shafts through the differential.

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