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9070 Power Flow in the Gears

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9070 Power Flow in the Gears 27 -9070 Power flow in the gears A. 4-speed transmission P27-0118-57A 1 Impeller 15 Brake band B2 2 Turbine wheel 18 Rear planet gear set 3 Reactor 20 Output shaft 4 Torque converter freewheel 28 Clutch K2 5 Input shaft 29 Freewheel F1 6 Stator shaft 30 Multiple-disc brake B3 10 Brake band B1 31 Clutch K1 12 Ravigneaux planet gear set © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 1 of 11 1st gear The partial gear reductions of the Ravigneaux planet gear set (i11 ) and of the single planet gear In 1st gear the brake band B2 (15) is applied and set (i21 ) result if, by multiplication, in the total the freewheel F1 (29) locked. In selector lever reduction of the 1st gear (i ). position "2" the clutch K2 (28) is additionally 1 shifted to engagement for power transmission. i11 = 1st partial reduction of front group Both groups of the planetary gear train are i21 = 1st partial reduction of rear group involved in gear reduction. i1 = total reduction of 1st gear Front group: Ravigneaux gear set i1 = i 11 i 21 The annulus of the Ravigneaux planet gear set is held stationary at brake band B2 through the The freewheel F1 is locked-up by engaging clutch freewheel F1 which locks in the reverse direction K2. When selector lever is in position "2", this of rotation. enables the braking action of the engine to also be utilized in 1st gear. The input shaft drives the wide planet gears of the Ravigneaux gear set through the large sunwheel. The planet gears orbit in the locked annulus and rotate the planet carrier in the same direction. Rear group: single planet gear set The sunwheel of the rear planet gear set is locked by brake band B2. The planet carrier of the Ravigneaux planet gear set is locked to the annulus of the rear planet gear set. The annulus of the rear planet gear set is driven with the output speed of the front group. The planet gears orbit around the locked sunwheel and rotate the planet carrier of the rear gear set and the output shaft in the same direction. 2nd gear In 2nd gear the brake bands B1 (10) and B2 (15) are applied. Both groups of the planetary gear train are involved in the gear reduction. © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 2 of 11 Front group: Ravigneaux planet gear set Brake band B1 locks the small sunwheel (7) of the Ravigneaux planet gear set. The input shaft drives the wide planet gears of the Ravigneaux planet gear set through the large sunwheel (4). Driven by the wide planet gears (3), the narrow planet gears (2) orbit around the locked small sunwheel (7) and rotate the planet carrier (6) of the Ravigneaux planet gear set in the driving direction of rotation. The annulus (1) of the Ravigneaux planet gear set runs without load in the driving direction of rotation without the freewheel F1 being engaged for power transmission (freewheeling state). Rear group: single planet gear set The power flow in the rear planet set corresponds to that in 1st gear. P27-5068-15 i12 = 2nd partial gear reduction, front group i21 = 1st partial gear reduction, rear group i2 = total gear reduction, 2nd gear i2 = i 12 i 21 © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 3 of 11 3rd gear 4th gear In 3rd gear the brake band B2 (15) is applied and In 4th gear the clutches K1 (31) and K2 (28) are the clutch K1 (31) is shifted to engagement for shifted to engagement for power transmission. power transmission. Both groups of the planetary gear train rotate as a Only the rear group is involved in the gear locked unit. reduction. Front group: Ravigneaux planet gear set Front group: Ravigneaux planet gear set The Ravigneaux planet gear set is locked by By engaging clutch K1, the small sunwheel of the clutch K1 and rotates with the 3rd partial gear Ravigneaux planet gear set is locked to the reduction i 13 = 1. planet carrier. The other components of the Ravigneaux planet gear set are thus also Rear group: single planet gear set blocked. By engaging clutch K2, the sunwheel of the rear planet gear set is locked by the Ravigneaux Partial gear reduction i13 = 1 planet gear set to the annulus of the rear planet gear set. The rear planet gear set is thus blocked Rear group: single planet gear set and rotates with the 2nd partial gear reduction i22 The annulus of the rear planet gear set is driven = 1. at driving speed. The power flow in the rear planet gear set corresponds to that in 1st and 2nd i13 = 3rd partial reduction, front group gear. i22 = 2nd partial reduction, rear group i4 = total reduction, 4th gear i13 = 3rd partial reduction, front group i21 = 1st partial reduction, rear group i4 = i13 i 22 = 1 1 =1 i3 = total reduction, 2nd gear i3 = i 13 i 21 © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 4 of 11 Reverse gear In reverse gear the multiple-disc brake B3 (30) is applied, the freewheel F1 (29) is locked and the clutch K2 (28) shifted to engagement for power transmmission. Both groups of the planetary gear train are involved in the gear reduction. Front group: Ravigneaux planet gear set The planet carriers of the Ravigneaux planet gear set and the connected annulus of the rear planet gear set are locked by the multiple-disc brake B3. The input shaft drives the wide planet gears of the Ravigneaux planet gear set through the large sunwheel. With the planet carrier locked, the direction of rotation of the annulus is reversed. Rear group: single planet gear set The reversing annulus of the Ravigneaux planet gear set drives the sunwheel of the rear planet gear set via the freewheel F1, which locks in the opposite direction. The planet gears of the rear gear set orbit around the locked annulus and drive the planet carrier and thus also the output shaft in the reverse direction of rotation. i1R = partial reduction, front group in reverse gear i23 = 3rd partial reduction, rear group iR = total reduction, reverse gear iR = i 1R i 23 Clutch K2 locks up the freewheel F1 which ensures that power flow is retained also when decelerating. B. 5-speed transmission © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 5 of 11 P27-0054-57B 5 Input shaft 24 Freewheel F2 10 Brake band B1 25 Clutch KS 12 Ravigneaux planet gear set 26 Brake BS 13 Middle planet gear set 28 Clutch K2 15 Brake band B2 29 Freewheel F1 16 Intermediate shaft 30 Multiple-disc brake B3 18 Rear planet gear set 31 Clutch K1 20 Output shaft © Daimler AG, 4/9/18, B/04/18, ra27007229070x, 9070 - Power flow in the gears A. 4-speed, B. 5-speed Automatic transmission 722.3/4/5 Page 6 of 11 1st gear Rear group: single planet gear set The rear planet gear set is blocked by the In 1st gear the brake band B2 (15) is applied and freewheel F2 which locks in the direction of clutch KS (25) is shifted to engagement for power rotation, and rotates at the 1st partial reduction i31 transmission. The freewheels F1 (29) and F2 (24) = 1. are locked. In selector lever position "2" clutch K2 (28) is The sunwheel is locked to the annulus by additionally switched to engagement for power engaging clutch KS. The result is that the power transmission. flow is also retained when decelerating. The front and the middle groups of the planetary The partial reductions of the Ravigneaux planet gear train are involved in the gear reduction. gear set (i11 ) and of the single planet gear sets (i ) (i ) produce, by multiplication, the total Front group: Ravigneaux planet gear set 21 31 reduction of the 1st gear (i ). The annulus of the Ravigneaux planet gear set is 1 locked at the brake band B2 by the freewheel F1 which locks in the reverse direction of rotation. i11 = 1st partial reduction, front group i21 = 1st partial reduction, middle group The input shaft drives the wide planet gears of i31 = 1st partial reduction, rear group the Ravigneaux gear set via the large sunwheel. i = total reduction, 1st gear The planet gears orbit in the locked annulus and 1 rotate the planet carrier in the same direction. i1 = i 11 i 21 i 31 Middle group: single planet gear set The sunwheel of the middle planet gear set is The freewheel F1 is locked up by engaging clutch locked by brake band B2. The planet carrier of K2. In selector lever position "2" it is thus possible the Ravigneaux planet gear set is locked to the to utilize the braking action of the engine also in annulus of the middle planet gear set. 1st gear. The annulus of the middle planet gear set is driven at the output speed of the front group.
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