With Assessment
|
Planetary Gearset: Teeth[a]
|
Count
|
Total
|
Avg.
|
|
Model Type
|
Max. Input Torque First Delivery
|
S1[b] R1[c]
|
S2[d] R2[e]
|
S3[f] R3[g]
|
S4[h] R4[i]
|
Brakes Clutches
|
Ratio Span
|
Gear Step[j]
|
Gear Ratio
|
R
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
Step
|
[k]
|
|
[l]
|
|
|
|
|
|
|
Step 2[m]
|
|
|
|
|
|
|
|
|
|
Shaft Speed
|
|
|
|
|
|
|
|
|
|
Δ Shaft Speed
|
|
|
|
|
|
|
|
|
|
|
8HP 70[n]
|
700 N⋅m (516 lb⋅ft) 2008
|
48[11] 96
|
48[11] 96
|
69[12] 111
|
23[12] 85
|
2 3
|
7.0435
|
1.3216[j]
|
Gear Ratio
|
−3.2968[k]
|
4.6957
|
3.1304[o]
|
2.1039
|
1.6667[j][o][p]
|
1.2845[o]
|
1.0000
|
0.8392[o][p]
|
0.6667
|
Step
|
0.7021[k]
|
1.0000
|
1.5000
|
1.4879
|
1.2623[j]
|
1.2975
|
1.2845
|
1.1917
|
1.2587
|
Step 2[m]
|
|
|
1.0081[o]
|
1.1787
|
0.9729[o]
|
1.0101[o]
|
1.0779
|
0.9467[o]
|
|
Speed
|
–1.4243
|
1.0000
|
1.5000
|
2.2319
|
2.8174
|
3.6555
|
4.6957
|
5.5965
|
7.0435
|
Δ Speed
|
1.4243
|
1.0000
|
0.5000
|
0.7319
|
0.5855[p]
|
0.8382
|
1.0401
|
0.9000[p]
|
1.4478
|
2010: 1st Generation
|
8HP 30/I 8HP 45
|
300 N⋅m (221 lb⋅ft) 450 N⋅m (332 lb⋅ft)
|
48 96
|
48 96
|
60 96
|
28 104
|
2 3
|
7.0714
|
1.3224[j]
|
Gear Ratio
|
−3.2952[k]
|
4.7143
|
3.1429[o]
|
2.1064
|
1.6667[j][o][p]
|
1.2854[o]
|
1.0000
|
0.8387[o][p]
|
0.6667
|
Step
|
0.6990[k]
|
1.0000
|
1.5000
|
1.4921
|
1.2638[j]
|
1.2966
|
1.2854
|
1.1923
|
1.2581
|
Step 2[m]
|
|
|
1.0053[o]
|
1.1805
|
0.9747[o]
|
1.0087[o]
|
1.0781
|
0.9477[o]
|
|
Speed
|
–1.4306
|
1.0000
|
1.5000
|
2.2381
|
2.8286
|
3.6576
|
4.7143
|
5.6209
|
7.0714
|
Δ Speed
|
1.4306
|
1.0000
|
0.5000
|
0.7381
|
0.5905[p]
|
0.8390
|
1.0467
|
0.9066[p]
|
1.45058
|
|
8HP 55 8HP 65 8HP 70 8HP 90
|
650 N⋅m (479 lb⋅ft) 650 N⋅m (479 lb⋅ft) 700 N⋅m (516 lb⋅ft) 900 N⋅m (664 lb⋅ft)
|
48 [11][13] 96
|
48 [11][13] 96
|
69 111
|
28 104
|
2 3
|
7.0714
|
1.3224[j]
|
Gear Ratio
|
−3.3168[k]
|
4.7143
|
3.1429[o]
|
2.1064
|
1.6667[j][o][p]
|
1.2847[o]
|
1.0000
|
0.8392[o][p]
|
0.6667
|
Step
|
0.7036[k]
|
1.0000
|
1.5000
|
1.4921
|
1.2638[j]
|
1.2973
|
1.2847
|
1.1917
|
1.2587
|
Step 2[m]
|
|
|
1.0053[o]
|
1.1806
|
0.9742[o]
|
1.0098[o]
|
1.0781
|
0.9467[o]
|
|
Speed
|
–1.4213
|
1.0000
|
1.5000
|
2.2381
|
2.8286
|
3.6696
|
4.7143
|
5.6179
|
7.0714
|
Δ Speed
|
1.4213
|
1.0000
|
0.5000
|
0.7381
|
0.5905[p]
|
0.8410
|
1.0447
|
0.9036[p]
|
1.4536
|
2014: 2nd Generation
|
8HP 75/I[14]
|
740 N⋅m (546 lb⋅ft)
|
48 96
|
48 96
|
69 111
|
28 104
|
2 3
|
7.0714
|
1.3224[j]
|
Ratio
|
−3.3168[k]
|
4.7143
|
3.1429[o]
|
2.1064
|
1.6667[j][o][p]
|
1.2847[o]
|
1.0000
|
0.8392[o][p]
|
0.6667
|
|
8HP 30/II[14] 8HP 50[14]
|
300 N⋅m (221 lb⋅ft) 500 N⋅m (369 lb⋅ft)
|
48 96
|
54 96
|
60 96
|
24 96
|
2 3
|
7.8125
|
1.3413[j]
|
Gear Ratio
|
−3.4560[k]
|
5.0000
|
3.2000[o]
|
2.1429
|
1.7200[j][o][p]
|
1.3139[o]
|
1.0000
|
0.8221[o][p]
|
0.6400
|
Step
|
0.6912[k]
|
1.0000
|
1.5625
|
1.4933
|
1.2458[j]
|
1.3091
|
1.3139
|
1.2163
|
1.2846
|
Step 2[m]
|
|
|
1.0463[o]
|
1.1986
|
0.9517[o]
|
0.9964[o]
|
1.0802
|
0.9469[o]
|
|
Speed
|
–1.4468
|
1.0000
|
1.5625
|
2.3333
|
2.9070
|
3.8056
|
5.0000
|
6.0817
|
7.8125
|
Δ Speed
|
1.4468
|
1.0000
|
0.5625
|
0.7708
|
0.5736[p]
|
0.8986
|
1.1944
|
1.0817[p]
|
1.7308
|
|
8HP 75/II[14] 8HP 95[q]
|
740 N⋅m (546 lb⋅ft) 900 N⋅m (664 lb⋅ft)
|
48 96
|
54 96
|
69 111
|
24 96
|
2 3
|
7.8125
|
1.3413[j]
|
Gear Ratio
|
−3.4783[k]
|
5.0000
|
3.2000[o]
|
2.1429
|
1.7200[j][o][p]
|
1.3131[o]
|
1.0000
|
0.8226[o][p]
|
0.6400
|
Step
|
0.6957[k]
|
1.0000
|
1.5625
|
1.4933
|
1.2458[j]
|
1.3099
|
1.3131
|
1.2156
|
1.2853
|
Step 2[m]
|
|
|
1.0463[o]
|
1.1986
|
0.9511[o]
|
0.9975[o]
|
1.0802
|
0.9458[o]
|
|
Speed
|
–1.4375
|
1.0000
|
1.5625
|
2.3333
|
2.9070
|
3.8078
|
5.0000
|
6.0781
|
7.8125
|
Δ Speed
|
1.4375
|
1.0000
|
0.5625
|
0.7708
|
0.5736[p]
|
0.9008
|
1.1922
|
1.0781[p]
|
1.7344
|
2018: 3rd Generation
|
8HP 76/I[r]
|
760 N⋅m (561 lb⋅ft)
|
48 96
|
54 96
|
69 111
|
24 96
|
2 3
|
7.8125
|
1.3413[j]
|
Ratio
|
−3.4783[k]
|
5.0000
|
3.2000[o]
|
2.1429
|
1.7200[j][o][p]
|
1.3131[o]
|
1.0000
|
0.8226[o][p]
|
0.6400
|
|
8HP 30/III[s] 8HP 51[t]
|
300 N⋅m (221 lb⋅ft) 500 N⋅m (369 lb⋅ft)
|
48 96
|
54 96
|
60 96
|
24 102
|
2 3
|
8.2031
|
1.3507[j]
|
Gear Ratio
|
−3.7120[k]
|
5.2500
|
3.3600[o]
|
2.1724
|
1.7200[j][o][p]
|
1.3161[o]
|
1.0000
|
0.8221[o][p]
|
0.6400
|
Step
|
0.7070[k]
|
1.0000
|
1.5625
|
1.5467
|
1.2630[j]
|
1.3069
|
1.3161
|
1.2163
|
1.2846
|
Step 2[m]
|
|
|
1.0102[o]
|
1.2246
|
0.9664[o]
|
0.9931[o]
|
1.0820
|
0.9469[o]
|
|
Speed
|
–1.4143
|
1.0000
|
1.5625
|
2.4167
|
3.0523
|
3.9892
|
5.2500
|
6.3858
|
8.2031
|
Δ Speed
|
1.4143
|
1.0000
|
0.5625
|
0.8542
|
0.6357[p]
|
0.9369
|
1.2608
|
1.1358[p]
|
1.8173
|
|
8HP 76/II[u] 8HP 80[v]
|
760 N⋅m (561 lb⋅ft) 800 N⋅m (590 lb⋅ft)
|
48 96
|
54 96
|
69 111
|
24 108
|
2 3
|
8.5938
|
1.3597[j]
|
Gear Ratio
|
−3.9930[k]
|
5.5000
|
3.5200[o]
|
2.2000
|
1.7200[j][o][p]
|
1.3172[o]
|
1.0000
|
0.8226[o][p]
|
0.6400
|
Step
|
0.7260[k]
|
1.0000
|
1.5625
|
1.6000
|
1.2791[j]
|
1.3058
|
1.3172
|
1.2156
|
1.2853
|
Step 2[m]
|
|
|
0.9766[o]
|
1.2509
|
0.9796[o]
|
0.9913[o]
|
1.0836
|
0.9458[o]
|
|
Speed
|
–1.3774
|
1.0000
|
1.5625
|
2.5000
|
3.1977
|
4.1754
|
5.5000
|
6.6859
|
8.5938
|
Δ Speed
|
1.3774
|
1.0000
|
0.5625
|
0.9375
|
0.6977[p]
|
0.9777
|
1.3246
|
1.1859[p]
|
1.8321
|
2016: Racing Cars
|
8P 45R[w]
|
450 N⋅m (332 lb⋅ft) up to 1,050 N⋅m (774 lb⋅ft)[20]
|
TBD
|
TBD
|
60 96
|
TBD
|
2 3
|
4.2000
|
1.2275[j]
|
Ratio
|
TBD
|
TBD
|
TBD
|
TBD
|
TBD
|
TBD
|
1.0000
|
TBD
|
TBD
|
2017: Commercial Vehicles[x]
|
8AP 600 T[y] 8AP 800 T 8AP 1000 T 8AP 1200 T
|
600 N⋅m (443 lb⋅ft) 800 N⋅m (590 lb⋅ft) 1,000 N⋅m (738 lb⋅ft) 1,200 N⋅m (885 lb⋅ft)[z]
|
65[aa] 115
|
65[aa] 115
|
62 122
|
27 105
|
2 3
|
7.6522
|
1.3374[j]
|
Gear Ratio
|
−4.2501[k]
|
4.8889
|
3.1235[o]
|
2.0334
|
1.6389[j][o][p]
|
1.2541[o]
|
1.0000
|
0.8400[o][p]
|
0.6389
|
Step
|
0.8693[k]
|
1.0000
|
1.5652
|
1.5361
|
1.2407[j]
|
1.3068
|
1.2541
|
1.1905
|
1.3148
|
Step 2[m]
|
|
|
1.0190[o]
|
1.2381
|
0.9494[o]
|
1.0420[o]
|
1.0535
|
0.9054[o]
|
|
Speed
|
–1.1503
|
1.0000
|
1.5652
|
2.4043
|
2.9831
|
3.8983
|
4.8889
|
5.8200
|
7.6522
|
Δ Speed
|
1.1503
|
1.0000
|
0.5652
|
0.8391
|
0.5787[p]
|
0.9153
|
0.9906
|
0.9311[p]
|
1.8322
|
|
8AP 1200 S [ab]
|
1,200 N⋅m (885 lb⋅ft)[z]
|
65[aa] 115
|
65[aa] 115
|
65[aa] 115
|
27 105
|
2 3
|
7.6522
|
1.3374[j]
|
Gear Ratio
|
−3.7569[k]
|
4.8889
|
3.1235[o]
|
2.0334
|
1.6389[j][o][p]
|
1.2676[o]
|
1.0000
|
0.8305[o][p]
|
0.6389
|
Step
|
0.7685[k]
|
1.0000
|
1.5652
|
1.5361
|
1.2407[j]
|
1.2929
|
1.2676
|
1.2041
|
1.2999
|
Step 2[m]
|
|
|
1.0190[o]
|
1.2381
|
0.9596[o]
|
1.0200[o]
|
1.0527
|
0.9263[o]
|
|
Speed
|
–1.3013
|
1.0000
|
1.5652
|
2.4043
|
2.9831
|
3.8568
|
4.8889
|
5.8867
|
7.6522
|
Δ Speed
|
1.3013
|
1.0000
|
0.5652
|
0.8391
|
0.5787[p]
|
0.8738
|
1.0321
|
0.9979[p]
|
1.7654
|
|
Ratio R & even
|
|
|
|
|
|
Ratio odd
|
|
|
|
|
Algebra And Actuated Shift Elements[ac]
|
Brake A[ad]
|
❶
|
❶
|
❶
|
|
|
|
|
❶
|
❶
|
Brake B[ae]
|
❶
|
❶
|
❶
|
❶
|
❶
|
❶
|
|
|
|
Clutch C[af]
|
|
❶
|
|
❶
|
|
❶
|
❶
|
❶
|
|
Clutch D[ag]
|
❶
|
|
|
|
❶
|
❶
|
❶
|
❶
|
❶
|
Clutch E[ah]
|
|
|
❶
|
❶
|
❶
|
|
❶
|
|
❶
|
|
- ^ Layout
• Input and output are on opposite sides • Planetary gearset 1 is on the input (turbine) side • Input shafts are C2 and, if actuated, R3 and S4 • Output shaft is C4 (planetary gear carrier of gearset 4)
- ^ Sun 1: sun gear of gearset 1
- ^ Ring 1: ring gear of gearset 1
- ^ Sun 2: sun gear of gearset 2
- ^ Ring 2: ring gear of gearset 2
- ^ Sun 3: sun gear of gearset 3
- ^ Ring 3: ring gear of gearset 3
- ^ Sun 4: sun gear of gearset 4
- ^ Ring 4: ring gear of gearset 4
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag Standard 50/50: 50/50 are above/below average step
With consistently falling gear steps (row highlighted in yellow), the lower half of them (rounded down, here the first three) is always larger and the upper half of them (rounded up, here the last four) is always smaller than the average gear step (cell highlighted in yellow two rows above). Deviating gear steps (red bold) indicate an unfavorable gearset selection
- ^ a b c d e f g h i j k l m n o p q r s t u Standard REV: reverse gear is similar to 1st gear
Reverse and 1st gear should have the same ratio. Plus 11 % minus 10 % compared to 1st gear is good, plus 25 % minus 20 % is acceptable (red); even larger deviations (bold) can impair the driving experience, especially when towing a trailer. A torque converter can only partially compensate for this deficiency
- ^ Standard FIRST: gear step 1st to 2nd gear
With consistently falling gear steps, the largest gear step is the one from the 1st to the 2nd gear, although it should be limited for a smooth gear shift. A ratio step of up to 5 : 3 (1.6667 : 1) is good, up to 7 : 4 (1.7500 : 1) is acceptable (red); above (bold) is unsatisfactory
- ^ a b c d e f g h i j From right to left
- ^ without generation designation
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp bq br bs bt bu bv bw bx by bz ca cb Standard SECOND: 2nd degree steps above 1
With consistently rising (from right to left) gear steps, each 2nd degree step (first row highlighted in green) is larger than 1. Smaller than its predecessor is acceptable (red); smaller than 1 (bold) is unsatisfactory
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an Standard SPEED: shaft speed difference increase
One difference that runs counter to the consistent increase in shaft speed differences (second row highlighted in green) is acceptable (red); two consecutive ones (bold) indicate an unfavorable gearset selection
- ^ Der neue BMW M760 Li xDrive · BMW Medieninformation Deutschland (The new BMW M760 Li xDrive · BMW Media Information Germany) · 02/2016 · p. 23 · and Der neue BMW M760 Li xDrive · Technische Daten · BMW Medieninformation Oesterreich (The new BMW M760 Li xDrive · Technical Specifications · BMW Media Information Austria) · 01/2017 · p. 2 · 800 N⋅m (590 lb⋅ft)[15][14]
- ^ narrow total ratio span · preferebly for petrol engines, sports cars, and high performance engines · Alpina B3 Saloon AWD · Technical Data · 730 N⋅m (538 lb⋅ft)[16][14]
- ^ Technical specifications · The new BMW 3 Series Sedan · BMW Media Information · 03/2019 · p. 2: BMW 320i Sedan · 300 N⋅m (221 lb⋅ft)[17][14]
- ^ loc. cit. · p. 10: BMW M340i xDrive Sedan · 500 N⋅m (369 lb⋅ft)[17][14]
- ^ wide total ratio span · preferebly for Diesel engines, offroad cars, and low performance engines · loc. cit. · p. 18: BMW 330d Sedan · 580 N⋅m (428 lb⋅ft)[17][14] and Alpina D3 S Saloon AWD · Technical Data · 730 N⋅m (538 lb⋅ft)[18]
- ^ wide total ratio span · preferebly for Diesel engines, offroad cars, and low performance engines · Alpina XB7 AWD · Technical Data · 800 N⋅m (590 lb⋅ft)[19]
- ^ w/o hydraulic torque converter · narrow total ratio span of 4.2[20]
- ^ based on the same gearset concept as the 8HP transmissions[21][22]
- ^ Automatic Powershift Transmission for Trucks[23]
- ^ a b higher torque on demand[24]
- ^ a b c d e 65/115 or 52/92[24][25]
- ^ Automatic Powershift Transmission for Special vehicles[25][26]
- ^ S1 and S2 share a common shaft
C1 (carrier 1) and R4 share a common shaft R2 and S3 share a common shaft R3 and S4 share a common shaft
- ^ Blocks S1 and S2
- ^ Blocks R1
- ^ Couples R3 and S4 with the turbine
- ^ Couples C3 (carrier 1) with C4 (carrier 4)
- ^ Couples R2 and S3 with R3 and S4
|
|