Jump to content

ZF 8HP transmission

From Wikipedia, the free encyclopedia

ZF 8HP
Automatic Transmission 8HP 70
Overview
ManufacturerZF Friedrichshafen
Production2008–present
Body and chassis
Class8-speed automatic transmission
RelatedGM 8L · Aisin-Toyota 8-speed · MB 9G-Tronic · ZF 9HP
Chronology
PredecessorZF 6HP

8HP is ZF Friedrichshafen AG's trademark name for its 8-speed automatic transmission models with hydraulic converter and planetary gearsets for longitudinal engine applications. Designed and first built by ZF's subsidiary in Saarbrücken, Germany, it debuted in 2008 on the BMW 7 Series (F01) 760Li sedan fitted with the V12 engine. BMW remains a major customer for the transmission.

Another major customer is Stellantis, who both received a license to produce the transmission and set up a joint-venture plant with ZF. Stellantis has built the transmission at its Kokomo Transmission plant since 2013 under their own brand name, the Torqueflite 8.[1][2] The joint venture plant in Gray Court, South Carolina opened in 2012.[3]

The 8HP is the first transmission to use this 8-speed gearset concept. In the meantime it has become the new benchmark for automatic transmissions.

The GM 8L transmission is based on the same globally patented gearset concept. While fully retaining the gearset logic, it differs from this only in the patented[4] arrangement of the components with gearsets 1 and 3 swapped.[5]

Gear Ratios[a]
Gear
Model
R 1 2 3 4 5 6 7 8 Total
Span
Span
Center
Avg.
Step
Compo-
nents
2008: Pilot Series 4
Gearsets
2
Brakes
3
Clutches
8HP 70 −3.297 4.696 3.130 2.104 1.667 1.285 1.000 0.839 0.667 7.043 1.769 1.322
2010: 1st Generation
8HP 30/I · 8HP 45 −3.295 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667 7.071 1.773 1.322
8HP 55 · 8HP 70
8HP 65 · 8HP 90
−3.317 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667 7.071 1.773 1.322
2014: 2nd Generation
8HP 75/I −3.317 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667 7.071 1.773 1.322
8HP 30/II · 8HP 50 −3.456 5.000 3.200 2.143 1.720 1.314 1.000 0.822 0.640 7.813 1.789 1.341
8HP 75/II · 8HP 95 −3.478 5.000 3.200 2.143 1.720 1.313 1.000 0.823 0.640 7.813 1.789 1.341
2018: 3rd Generation
8HP 76/I −3.478 5.000 3.200 2.143 1.720 1.313 1.000 0.823 0.640 7.813 1.789 1.341
8HP 30/III · 8HP 51 −3.712 5.250 3.360 2.172 1.720 1.316 1.000 0.822 0.640 8.203 1.833 1.351
8HP 76/II −3.993 5.500 3.520 2.200 1.720 1.317 1.000 0.823 0.640 8.594 1.876 1.360
2022: 4th Generation
8HP 100 −3.968 5.000 3.200 2.143 1.720 1.297 1.000 0.833 0.640 7.813 1.789 1.341
8HP 80 −4.544 5.500 3.520 2.200 1.720 1.301 1.000 0.833 0.640 8.594 1.876 1.360
2016: Racing Cars
8P 45R TBD TBD TBD TBD TBD TBD 1.000 TBD TBD 4.200 TBD 1.228
2017: Commercial Vehicles
8AP 600 T · 8AP 1000 T
8AP 800 T · 8AP 1200 T
−4.250 4.889 3.123 2.033 1.639 1.254 1.000 0.840 0.639 7.652 1.767 1.337
8AP 1200 S −3.757 4.889 3.123 2.033 1.639 1.268 1.000 0.830 0.639 7.652 1.767 1.337
  1. ^ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage

Specifications

[edit]

2008: Pilot Series

[edit]

The 8HP 70 transmission with the gearset 4 in 23-85-teeth-configuration was the pilot series and therefore without generation designation. It was first used in the BMW 7 Series (F01) 760Li, has a torque handling limit of 700 N⋅m (516 lb⋅ft), and weighs 87 kg (192 lb).[6]

2010: 1st Generation

[edit]

In addition to the rear-wheel drive variant, two different four-wheel drive versions were available, with a version destined for Volkswagen Group applications using a Torsen centre differential.[7] It is able to encompass a torque range from 300 N⋅m (221 lb⋅ft) to 1,000 N⋅m (738 lb⋅ft), and is available for use in middle-class cars through to large luxury sport utility vehicles.[7]

Since gearset 4 meshes in almost all gears up to and including 5th gear, large gear wheels are advantageous for durability. As the very high ratio 1st gear is formed exclusively by gearset 4, its sun gear is unusually small. For this reason, this gearset was enlarged by over 20 % when the 1st generation was introduced, even if this advantage had to be given up again immediately when the 2nd generation was introduced in order to increase the total span.

2014: 2nd Generation

[edit]

Efficiency improvements over the pilot design and the first generation include a wider ratio span of 7.81, reduced drag torque from the shift elements, reduction in required oil pump pressure, and broadened use of the coasting and start-stop systems.[8] ZF estimated fuel economy improvement over first generation to be 3 %. Refinements were also made with respect to vibration.

2018: 3rd Generation

[edit]

Major improvements are total span of 8.59 and a fuel economy improvement of 2.5 % compared to the second generation. There are several options in maximum torque available, also the gearbox is available with mild hybrid and plug in hybrid options: With 15 kW (20 hp) and 200 N⋅m (148 lb⋅ft) supporting boosting and recuperation in combination with 48 Volt technology up to 90 kW (121 hp) and 250 N⋅m (184 lb⋅ft) for usage with higher voltage.[9]

2022: 4th Generation

[edit]

Major improvement is the transition to a versatile modular system that allows vehicle manufacturers to comprehensively and flexibly electrify their models as required. Plug-in Hybrid options with up to 160 kW (215 hp) and 280 N⋅m (207 lb⋅ft) are capable of saving up to 70 % of carbon emissions compared with a purely conventional variant of the 8HP according to the Worldwide Harmonised Light Vehicles Test Procedure (WLTP).[10] In addition, a modification to gearset 3 increased the reverse gear ratio, making it less disadvantageous. With this gearset concept, the already disadvantageously large step from 7th to 8th gear is further increased, albeit only slightly.

Layout (Gearset Concept) Progress

[edit]

The main objective in replacing the predecessor model was to improve vehicle fuel economy with extra speeds and a wider gear span to allow the engine speed level to be lowered (downspeeding). Compared to the 6-speed ZF 6HP transmission it uses 12 % less fuel, and 14 % less than a 5-speed transmission.[11][12] Due to changes in internal design, the shift times have reduced to 0.2 seconds; additionally, the unit brings the ability to shift in a non-sequential manner – going from gear 8 to gear 2 in extreme situations simply by changing one shift element (actuating break B and releasing clutch D).[13]

Progress Quality

[edit]

In order to increase the number of ratios, ZF has abandoned the conventional design method of limiting themselves to pure in-line epicyclic gearing and extended it to a combination with parallel epicyclic gearing. This was only possible thanks to computer-aided design and has resulted in a globally patented gearset concept. The resulting progress is reflected in a better ratio of the number of gears to the number of components used compared to existing layouts. The 8HP has become the new reference standard (benchmark) for automatic transmissions.

Innovative Strength Analysis
With
Asessment
Output:
Gear
Ratios
Innovation
Elasticity[a]
Δ Output : Δ Input
Input: Main Components
Total Gearsets Brakes Clutches
8HP
Ref. Object

Topic[a]



Δ Number
Relative Δ Δ Output

·
Δ Input
8HP
6HP[b]
8[c]
6[c]
Progress[a] 9
8
4
3[d]
2
2
3
3
Δ Number 2 1 1 0 0
Relative Δ 0.333
2.667[a]
·
0.125
0.333
0.000
0.000
8HP
3-Speed[e]
8[c]
3[c]
Market Position[a] 9
7
4
2
2
3
3
2
Δ Number 5 2 2 -1 1
Relative Δ 1.667
5.833[a]
·
0.286
1.000
−0.333
0.500
  1. ^ a b c d e f Innovation Elasticity Classifies Progress And Market Position
    • Automobile manufacturers drive forward technical developments primarily in order to remain competitive or to achieve or defend technological leadership. This technical progress has therefore always been subject to economic constraints
    • Only innovations whose relative additional benefit is greater than the relative additional resource input, i.e. whose economic elasticity is greater than 1, are considered for realization
    • The required innovation elasticity of an automobile manufacturer depends on its expected return on investment. The basic assumption that the relative additional benefit must be at least twice as high as the relative additional resource input helps with orientation
      • negative, if the output increases and the input decreases, is perfect
      • 2 or above is good
      • 1 or above is acceptable (red)
      • below this is unsatisfactory (bold)
  2. ^ Direct Predecessor
    • To reflect the progress of the specific model change
  3. ^ a b c d plus 1 reverse gear
  4. ^ of which 2 gearsets are combined as a compound Ravigneaux gearset
  5. ^ Reference Standard (Benchmark)
    • 3-speed transmissions with torque converters have established the modern market for automatic transmissions and thus made it possible in the first place, as this design proved to be a particularly successful compromise between cost and performance
    • It became the archetype and dominated the world market for around 3 decades, setting the standard for automatic transmissions. It was only when fuel consumption became the focus of interest that this design reached its limits, which is why it has now completely disappeared from the market
    • What has remained is the orientation that it offers as a reference standard (point of reference, benchmark) for this market for determining progressiveness and thus the market position of all other, later designs
    • All transmission variants consist of 7 main components
    • Typical examples are

Layout Quality

[edit]

The ratios of the 8 gears are relatively unevenly distributed in all versions. Particularly noticeable are the too small step between 3rd and 4th gear and the too large one between 7th and 8th gear. This cannot be eliminated without affecting all other gear ratios. On the other hand the selected gearset concept offers 2 to 3 gears more than conventional transmissions of comparable manufacturing costs, which more than compensates for the weaknesses.

Gear Ratio Analysis
With Assessment Planetary Gearset: Teeth[a] Count Total[b]
Center[c]
Avg.[d]
Model
Type
Version S1[e]
R1[f]
S2[g]
R2[h]
S3[i]
R3[j]
S4[k]
R4[l]
Brakes
Clutches
Ratio
Span
Gear
Step[m]
Gear
Ratio
R
1
2
3
4
5
6
7
8
Step[m] [n] [o]
Δ Step[p][q]
Shaft
Speed
Δ Shaft
Speed[r]
2008: Pilot Series
8HP 70[s] 700 N⋅m (516 lb⋅ft) 48[14]
96
48[14]
96
69[5]
111
23[5]
85
2
3
7.0435
1.7693
1.3216[m]
Gear
Ratio
−3.2968[n]
4.6957
3.1304[q]
2.1039
1.6667[m][q][r]
1.2845[q]
1.0000
0.8392[q][r]
0.6667
Step 0.7021[n] 1.0000 1.5000 1.4879 1.2623[m] 1.2975 1.2845 1.1917 1.2587
Δ Step[p] 1.0081[q] 1.1787 0.9729[q] 1.0101[q] 1.0779 0.9467[q]
Speed -1.4243 1.0000 1.5000 2.2319 2.8174 3.6555 4.6957 5.5957 7.0435
Δ Speed 1.4243 1.0000 0.5000 0.7319 0.5855[r] 0.8382 1.0401 0.9000[r] 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
1.7728
1.3224[m]
Gear
Ratio
−3.2952[n]
4.7143
3.1429[q]
2.1064
1.6667[m][q][r]
1.2854[q]
1.0000
0.8387[q][r]
0.6667
Step 0.6990[n] 1.0000 1.5000 1.4921 1.2638[m] 1.2966 1.2854 1.1923 1.2581
Δ Step[p] 1.0053[q] 1.1805 0.9747[q] 1.0087[q] 1.0781 0.9477[q]
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[r] 0.8390 1.0467 0.9066[r] 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
[14][15]
96
48
[14][15]
96
69
111
28
104
2
3
7.0714
1.7728
1.3224[m]
Gear
Ratio
−3.3168[n]
4.7143
3.1429[q]
2.1064
1.6667[m][q][r]
1.2847[q]
1.0000
0.8392[q][r]
0.6667
Step 0.7036[n] 1.0000 1.5000 1.4921 1.2638[m] 1.2973 1.2847 1.1917 1.2587
Δ Step[p] 1.0053[q] 1.1806 0.9742[q] 1.0098[q] 1.0781 0.9467[q]
Speed -1.4213 1.0000 1.5000 2.2381 2.8286 3.6696 4.7143 5.6179 7.0714
Δ Speed 1.4243 1.0000 0.5000 0.7381 0.5905[r] 0.8410 1.0447 0.9036[r] 1.4536
2014: 2nd Generation
8HP 75/I[16] 740 N⋅m (546 lb⋅ft) 48
96
48
96
69
111
28
104
2
3
7.0714
1.7728
1.3224[m]
Ratio −3.3168[n] 4.7143 3.1429[q] 2.1064 1.6667[m][q][r] 1.2847[q] 1.0000 0.8392[q][r] 0.6667
8HP 30/II[16]
8HP 50[16]
300 N⋅m (221 lb⋅ft)
500 N⋅m (369 lb⋅ft)
48
96
54
96
60
96
24
96
2
3
7.8125
1.7889
1.3413[m]
Gear
Ratio
−3.4560[n]
5.0000
3.2000[q]
2.1429
1.7200[m][q][r]
1.3139[q]
1.0000
0.8221[q][r]
0.6400
Step 0.6912[n] 1.0000 1.5625 1.4933 1.2458[m] 1.3091 1.3139 1.2163 1.2846
Δ Step[p] 1.0463[q] 1.1986 0.9517[q] 0.9964[q] 1.0802 0.9469[q]
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[r] 0.8986 1.1944 1.0817[r] 1.7308
8HP 75/II[16]
8HP 95[t]
740 N⋅m (546 lb⋅ft)
900 N⋅m (664 lb⋅ft)
48
96
54
96
69
111
24
96
2
3
7.8125
1.7889
1.3413[m]
Gear
Ratio
−3.4783[n]
5.0000
3.2000[q]
2.1429
1.7200[m][q][r]
1.3131[q]
1.0000
0.8226[q][r]
0.6400
Step 0.6957[n] 1.0000 1.5625 1.4933 1.2458[m] 1.3099 1.3131 1.2156 1.2853
Δ Step[p] 1.0463[q] 1.1986 0.9511[q] 0.9975[q] 1.0802 0.9458[q]
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[r] 0.9008 1.1922 1.0781[r] 1.7344
2018: 3rd Generation
8HP 76/I[u] 760 N⋅m (561 lb⋅ft) 48
96
54
96
69
111
24
96
2
3
7.8125
1.7889
1.3413[m]
Ratio −3.4783[n] 5.0000 3.2000[q] 2.1429 1.7200[m][q][r] 1.3131[q] 1.0000 0.8226[q][r] 0.6400
8HP 30/III[v]
8HP 51[w]
300 N⋅m (221 lb⋅ft)
500 N⋅m (369 lb⋅ft)
48
96
54
96
60
96
24
102
2
3
8.2031
1.8330
1.3507[m]
Gear
Ratio
−3.7120[n]
5.2500
3.3600[q]
2.1724
1.7200[m][q][r]
1.3161[q]
1.0000
0.8221[q][r]
0.6400
Step 0.7070[n] 1.0000 1.5625 1.5467 1.2630[m] 1.3069 1.3161 1.2163 1.2846
Δ Step[p] 1.0102[q] 1.2246 0.9664[q] 0.9931[q] 1.0820 0.9469[q]
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[r] 0.9369 1.2608 1.1358[r] 1.8173
8HP 76/II[x] 760 N⋅m (561 lb⋅ft) 48
96
54
96
69
111
24
108
2
3
8.5938
1.8762
1.3597[m]
Gear
Ratio
−3.9930[n]
5.5000
3.5200[q]
2.2000
1.7200[m][q][r]
1.3172[q]
1.0000
0.8226[q][r]
0.6400
Step 0.7260[n] 1.0000 1.5625 1.6000 1.2791[m] 1.3058 1.3172 1.2156 1.2853
Δ Step[p] 0.9766[q] 1.2509 0.9796[q] 0.9913[q] 1.0836 0.9458[q]
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[r] 0.9777 1.3246 1.1859[r] 1.8321
2022: 4th Generation
8HP 100[y] 1,000 N⋅m (738 lb⋅ft)
[10]
48
96
54
96
60
108
24
96
2
3
7.8125
1.7889
1.3413[m]
Gear
Ratio
−3.9680[n]
5.0000
3.2000[q]
2.1429
1.7200[m][q][r]
1.2973[q]
1.0000
0.8327[q][r]
0.6400
Step 0.7936[n] 1.0000 1.5625 1.4933 1.2458[m] 1.3259 1.2973 1.2009 1.3011
Δ Step[p] 1.0463[q] 1.1986 0.9397[q] 1.0220[q] 1.0803 0.9230[q]
Speed -1.2601 1.0000 1.5625 2.3333 2.9070 3.8542 5.0000 6.0045 7.8125
Δ Speed 1.2601 1.0000 0.5625 0.7708 0.5736[r] 0.9473 1.1458 1.0045[r] 1.8080
8HP 80[z] 800 N⋅m (590 lb⋅ft)
[10]
48
96
54
96
60
108
24
108
2
3
8.5938
1.8762
1.3597[m]
Gear
Ratio
−4.5440[n]
5.5000
3.5200[q]
2.2000
1.7200[m][q][r]
1.3010[q]
1.0000
0.8327[q][r]
0.6400
Step 0.8262[n] 1.0000 1.5625 1.6000 1.2791[m] 1.3221 1.3010 1.2009 1.3011
Δ Step[p] 0.9766[q] 1.2509 0.9675[q] 1.0162[q] 1.0834 0.9230[q]
Speed -1.2104 1.0000 1.5625 2.5000 3.1977 4.2275 5.5000 6.6049 8.5938
Δ Speed 1.2104 1.0000 0.5625 0.9375 0.6977[r] 1.0298 1.2725 1.1049[r] 1.9888
2016: Racing Cars
8P 45R[aa] 450 N⋅m (332 lb⋅ft) up to
1,050 N⋅m (774 lb⋅ft)[28]
TBD TBD 60
96
TBD 2
3
4.2000
TBD
1.2275[m]
Ratio TBD TBD TBD TBD TBD TBD 1.0000 TBD TBD
2017: Commercial Vehicles[ab]
8AP 600 T[ac]
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)[ad]
65[ae]
115
65[ae]
115
62
122
27
105
2
3
7.6522
1.7673
1.3374[m]
Gear
Ratio
−4.2501[n]
4.8889
3.1235[q]
2.0334
1.6389[m][q][r]
1.2541[q]
1.0000
0.8400[q][r]
0.6389
Step 0.8693[n] 1.0000 1.5652 1.5361 1.2407[m] 1.3068 1.2541 1.1905 1.3148
Δ Step[p] 1.0190[q] 1.2381 0.9494[q] 1.0420[q] 1.0535 0.9054[q]
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[r] 0.9153 0.9906 0.9311[r] 1.8322
8AP 1200 S
[af]
1,200 N⋅m (885 lb⋅ft)[ad] 65[ae]
115
65[ae]
115
65[ae]
115
27
105
2
3
7.6522
1.7673
1.3374[m]
Gear
Ratio
−3.7569[n]
4.8889
3.1235[q]
2.0334
1.6389[m][q][r]
1.2676[q]
1.0000
0.8305[q][r]
0.6389
Step 0.7685[n] 1.0000 1.5652 1.5361 1.2407[m] 1.2929 1.2676 1.2041 1.2999
Δ Step[p] 1.0190[q] 1.2381 0.9596[q] 1.0200[q] 1.0527 0.9263[q]
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[r] 0.8738 1.0321 0.9979[r] 1.7654
Ratio
R & Even
Ratio
Odd
Algebra And Actuated Shift Elements[ag]
Brake A[ah]
Brake B[ai]
Clutch C[aj]
Clutch D[ak]
Clutch E[al]
  1. ^ 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)
  2. ^ Total Ratio Span (Total Ratio Spread · Total Gear Ratio)
    • A wider span enables the
      • downspeeding when driving outside the city limits
      • increase the climbing ability
        • when driving over mountain passes or off-road
        • or when towing a trailer
  3. ^ Ratio Span's Center
    • The center indicates the speed level of the transmission
    • Together with the final drive ratio
    • it gives the shaft speed level of the vehicle
  4. ^ Average Gear Step
    • With decreasing step width
      • the gears connect better to each other
      • shifting comfort increases
  5. ^ Sun 1: sun gear of gearset 1
  6. ^ Ring 1: ring gear of gearset 1
  7. ^ Sun 2: sun gear of gearset 2
  8. ^ Ring 2: ring gear of gearset 2
  9. ^ Sun 3: sun gear of gearset 3
  10. ^ Ring 3: ring gear of gearset 3
  11. ^ Sun 4: sun gear of gearset 4
  12. ^ Ring 4: ring gear of gearset 4
  13. ^ 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 50:50
    — 50 % Is Above And 50 % Is Below The Average Gear Step —
    • With steadily decreasing gear steps (yellow highlighted line Step)
    • and a particularly large step from 1st to 2nd gear
      • the lower half of the gear steps (between the small gears; rounded down, here the first 3) is always larger
      • and the upper half of the gear steps (between the large gears; rounded up, here the last 4) is always smaller
    • than the average gear step (cell highlighted yellow two rows above on the far right)
    • lower half: smaller gear steps are a waste of possible ratios (red bold)
    • upper half: larger gear steps are unsatisfactory (red bold)
  14. ^ 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 Standard R:1
    — Reverse And 1st Gear Have The Same Ratio —
    • The ideal reverse gear has the same transmission ratio as 1st gear
      • no impairment when maneuvering
      • especially when towing a trailer
      • a torque converter can only partially compensate for this deficiency
    • Plus 11.11 % minus 10 % compared to 1st gear is good
    • Plus 25 % minus 20 % is acceptable (red)
    • Above this is unsatisfactory (bold)
  15. ^ Standard 1:2
    — Gear Step 1st To 2nd Gear As Small As Possible —
    • With continuously decreasing gear steps (yellow marked line Step)
    • the largest gear step is the one from 1st to 2nd gear, which
      • for a good speed connection and
      • a smooth gear shift
    • must be as small as possible
      • A gear ratio of up to 1.6667:1 (5:3) is good
      • Up to 1.7500:1 (7:4) is acceptable (red)
      • Above is unsatisfactory (bold)
  16. ^ a b c d e f g h i j k l From large to small gears (from right to left)
  17. ^ 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 cc cd ce cf cg ch ci cj ck cl cm cn co cp cq cr cs Standard STEP
    — From Large To Small Gears: Steady And Progressive Increase In Gear Steps —
    • Gear steps should
      • increase: Δ Step (first green highlighted line Δ Step) is always greater than 1
      • As progressive as possible: Δ Step is always greater than the previous step
    • Not progressively increasing is acceptable (red)
    • Not increasing is unsatisfactory (bold)
  18. ^ 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 Standard SPEED
    — From Small To Large Gears: Steady Increase In Shaft Speed Difference —
    • Shaft speed differences should
      • increase: Δ Shaft Speed (second line marked in green Δ (Shaft) Speed) is always greater than the previous one
    • 1 difference smaller than the previous one is acceptable (red)
    • 2 consecutive ones are a waste of possible ratios (bold)
  19. ^ without generation designation
  20. ^ 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)[17][16]
  21. ^ 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)[18][16]
  22. ^ Technical specifications · The new BMW 3 Series Sedan · BMW Media Information · 03/2019 · p. 2: BMW 320i Sedan · 300 N⋅m (221 lb⋅ft)[19][16]
  23. ^ loc. cit. · p. 10: BMW M340i xDrive Sedan · 500 N⋅m (369 lb⋅ft)[19][16]
  24. ^ 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)[19][16] and Alpina D3 S Saloon AWD · Technical Data · 730 N⋅m (538 lb⋅ft)[20]
  25. ^ narrow total ratio span · preferebly for petrol engines, sports cars, and high performance engines · The first-ever BMW XM · Market launch September 2022[21][22] The all-new BMW M5 · Market launch June 2024[23][24]
  26. ^ wide total ratio span · preferebly for Diesel engines, offroad cars, and low performance engines · Progress and efficiency with added variety: additional drive system variants and innovations for the new BMW 7 Series · Market launch 2022/2023[25][26] Alpina XB7 AWD · Technical Data[27]
  27. ^ w/o hydraulic torque converter · narrow total ratio span of 4.2[28]
  28. ^ based on the same gearset concept as the 8HP transmissions[29][30]
  29. ^ Automatic Powershift Transmission for Trucks[31]
  30. ^ a b higher torque on demand[32]
  31. ^ a b c d e 65/115 or 52/92[32][33]
  32. ^ Automatic Powershift Transmission for Special vehicles[33][34]
  33. ^ Permanently coupled elements
    • S1 and S2
    • C1 (carrier 1) and R4
    • R2 and S3
    • R3 and S4
  34. ^ Blocks S1 and S2
  35. ^ Blocks R1
  36. ^ Couples R3 and S4 with the turbine
  37. ^ Couples C3 (carrier 1) with C4 (carrier 4)
  38. ^ Couples R2 and S3 with R3 and S4

Applications

[edit]
Variants And Applications
Model Max. torque petrol Max. torque diesel Car Model[a]
2008: Pilot Series (8HP 70 only) · 2010: 1st Generation
8HP 45 450 N⋅m (332 lb⋅ft) 500 N⋅m (369 lb⋅ft) BMW 1 Series (F20)
BMW X1 (E84)
BMW 2 Series (F22) M235i
BMW 3 Series (F30)
BMW 4 Series (F32)
BMW 5 Series (F10/F11)
BMW 6 Series (F06/F12/F13)
BMW 7 Series (F01/F02)
BMW X3 (F25)
BMW X4 (F26)
BMW X5 (E70) 35i
BMW X5 (F15)
BMW X6 (F16)
BMW Z4 (E89)
Jaguar XE
Jaguar XF (X250) (2013–2015)
Jaguar XJ (2013–)
Lancia Thema V6
Land Rover Range Rover (L322) (2011–2012)
Land Rover Range Rover (L405) (2012–)
Land Rover Range Rover Velar I4 (2017–)
Torqueflite 845RE[35] Chrysler 300 3.6 L Pentastar V6 (2011–2023)[36]
Chrysler 300 C
Dodge Challenger 3.6 L Pentastar V6 (2015–2023)
Dodge Charger 3.6 L Pentastar V6 (2012–2023)[37]
Dodge Durango[38][39] 3.6 L Pentastar V6 (2014–2017)
Jeep Grand Cherokee (WK2) 3.6 L Pentastar V6 (2014–2016) Ram 1500 3.6 L Pentastar V6[40][41][42] (2012–2019)
8HP 55 650 N⋅m (479 lb⋅ft) 650 N⋅m (479 lb⋅ft) Audi A4 North American (US) B8/8.5 Quattro Versions[43] (2011–) Audi A5 North American (US) B8/8.5 Quattro Versions (2011–) Audi A6 (C7)
Audi A7 (C7)
Audi A6 Hybrid (C7)
Audi S4 (B9)
Audi S5 (B9)
8HP 65 Audi A4 (B9) Audi A6 Hybrid (C7 PHEV) PR China[44] Audi A6 (C8)
Audi A7 (C8)
Audi Q7 (4M)
Audi Q8
Audi A8 (D4)
Audi A8 (D5)
Audi S6 (C8)
Porsche Cayenne (2018-)
Volkswagen Touareg (2018-)
8HP 70
Pilot
&
1st
700 N⋅m (516 lb⋅ft) 700 N⋅m (516 lb⋅ft) Alpina B3 (F30/F31)
Alpina D3 (F30/F31)
Alpina B3 (G20/G21)
Alpina D3 (G20/G21)
Alpina B4 (F32/F33)
Alpina D4 (F32/F33)
Alpina XD4
Aston Martin Rapide S 2014–2020[45]
Aston Martin Vanquish 2015–2018
Audi Q5 8AT version
Audi Q7 (2011–2015)
BMW 3 Series (F30) 330d & 335d
BMW 4 Series (F32) 430d & 435d
BMW 5 Series (F10/F11)
BMW 7 Series (F01/F02)
BMW X5 (E70) 50i
Chrysler 300 5.7 L HEMI V8 (2015–2023)
Dodge Challenger 5.7 L HEMI V8 (2015–2023)
Dodge Charger 5.7 L HEMI V8 (2015–2023)
Dodge Charger 6.4 L HEMI V8
Dodge Durango[38][39] 5.7 L HEMI V8
Dodge Durango[38][39] 6.4 L HEMI V8
Haval H9 (2017–)
Iveco Daily (2014–)[46]
Jaguar F-Type V6 & V8
Jaguar XE 35t
Jaguar XF (X250) (2013–2015)
Jaguar XJ (2013–)
Jeep Grand Cherokee (WK2) 5.7 L HEMI V8 Engine Code [T] EZH & 6.4 L HEMI V8 Engine Code [J] ESG (2014–)
Jeep Grand Cherokee (WK2) 3.0 L EcoDiesel V6 (2014–2016)
Jeep Grand Cherokee WL & L 5.7 L HEMI V8 (2021–)
Land Rover Discovery LR4 (2009–2016)
Land Rover Range Rover Sport L320 SDV6 only (2012–2013)
Land Rover Range Rover (L322) TDV8 only (2011–2012)
Land Rover Range Rover (L405) (2012–)
Land Rover Range Rover Sport L494 (2012–)
Land Rover Range Rover Velar V6 & V8 (2017–)
MAN TGE (longitudinal engine only) (2017–)
Maserati Ghibli (M157)
Maserati Grecale
Maserati Levante
Maserati Quattroporte[47] (2013–)
Morgan Plus Six
Porsche Panamera Diesel & Hybrid models only (2009–2016)
Porsche Cayenne (2011–2018)
Ram 1500 5.7 L HEMI V8[40][41][42] (2012–2019)
Ram 1500 3.0 L EcoDiesel V6[40][41][42] (2013–2019)
Rolls-Royce Phantom VII
Rolls-Royce Phantom VIII
Volkswagen Touareg (2011–2018)
Volkswagen Amarok (2012–2020)
Volkswagen Crafter SY/SZ (longitudinal engine only) (2017–)
8HP 90 900 N⋅m (664 lb⋅ft) 1,000 N⋅m (738 lb⋅ft)


Audi Q7 V8 TDI only (2011–2015)
Audi A8 (D4)
Audi RS6 (C7)
Bentley Mulsanne (2010)
Bentley Continental GT 2nd gen. (2011–2018)
BMW 760i/Li (F01/F02)[44]
Dodge Challenger SRT Hellcat 6.2 L HEMI V8 Supercharged
Dodge Charger SRT Hellcat 6.2 L HEMI V8 Supercharged
Porsche Cayenne (2011–2018) Turbo models and V8 Diesel only
Rolls-Royce Ghost[48]
Rolls-Royce Wraith (2013)
Volkswagen Touareg V8 TDI only (2011–2018)
2014: 2nd Generation
8HP 50 500 N⋅m (369 lb⋅ft) 500 N⋅m (369 lb⋅ft) Alfa Romeo Giulia
Alfa Romeo Stelvio
BMW 1 Series (F20) LCI
BMW X1 (E84)
BMW 2 Series (F22) M240i
BMW 3 Series (F30) LCI
BMW 4 Series (F32) LCI
BMW 5 Series (F10//F11)
BMW 5 Series (G30/G31)
BMW 7 Series (G11/G12)
BMW X3 20D (G01)
BMW X3 30i (G01)
BMW X3 M40i (G01)
BMW X4 20D (G02)
BMW X4 30i (G02)
BMW X4 M40i (G02)
BMW X7
Jaguar F-Pace (2016–)
Jaguar XF (X260) (2016–)
Jaguar XJ (–2019)
Land Rover Defender (L663) (2019–)
Land Rover Range Rover (L405) (–2022)
Land Rover Range Rover (L460) (2022–)
Maserati Grecale
Hongqi H9 V6 (2024–)
Torqueflite 850RE[49] Dodge Charger Pursuit V6 (2021–2023)
Dodge Durango[38][39] 3.6 L Pentastar V6 (2017–)
Jeep Gladiator (JT) 3.6 L Pentastar V6 (2019–)
Jeep Grand Cherokee (WK2) 3.6 L Pentastar V6 (2017–2021)
Jeep Grand Cherokee WL & L 2.0 L I4 (2021–)
Jeep Grand Cherokee WL & L 3.6 L Pentastar V6 (2021–)
Jeep Wrangler/Unlimited (JL) 2.0 L I4 Hurricane Turbocharged (2017–)
Jeep Wrangler/Unlimited (JL) 3.6 L Pentastar V6 (2017–)
Ram 1500 (DT) 3.6 L Pentastar V6 (2019–)
8HP 75 700 N⋅m (516 lb⋅ft)
[50]
740 N⋅m (546 lb⋅ft)
[50]
Alfa Romeo Giulia Quadrifoglio
Alfa Romeo Stelvio Quadrifoglio
Alpina B5 (G30/G31)
Alpina D5 (G30/G31)
Alpina B6 (F12) Gran Coupé (2014)
Alpina XD3
Alpina XB7
Aston Martin DB11
Aston Martin Vantage (2018) V8
BMW 5 Series (G30/G31)
BMW M5 (F90)
BMW 7 Series (G11/G12)[51]
BMW X3 30D (G01)
BMW X5 (F15)[52]
BMW X5 (F85) M
BMW X6 (F86) M
BMW X7
Jaguar F-Pace (2016–)
Jaguar XF (X260) (2016–)
Jaguar XJ (–2019)
Jeep Gladiator (JT) 3.0 L EcoDiesel V6 (2020–2023)
Jeep Grand Cherokee (WK2) 3.0 L EcoDiesel V6 (2017–2021)
Jeep Wagoneer/Grand Wagoneer (WS) (2021–)
Jeep Wrangler 392 (2021–)
Jeep Wrangler/Unlimited (JL) 6.4 L HEMI V8 (2021–)
Jeep Wrangler/Unlimited (JL) 3.0 L EcoDiesel V6 (2020–2023)
JMC Vigus
Land Rover Defender (L663) (2019–)
Land Rover Discovery L462 (2017–)
Land Rover Range Rover (L405) (–2022)
Land Rover Range Rover (L460) (2022–)
Ram 1500 (DT) 5.7 L HEMI V8 (2019–)
Ram 1500 (DT) 3.0 L EcoDiesel V6 (2019–2023)
8HP 75-LCV Ram 2500 6.4 L HEMI V8 (2018–) Ram 3500 6.4 L HEMI V8 (2018–)
8HP 95 900 N⋅m (664 lb⋅ft) 1,000 N⋅m (738 lb⋅ft) Aston Martin DBS Superleggera[45]
Audi S8
Audi RS6[53]
Audi RS7[54]
Audi SQ7
|Audi Q8
Audi RS Q8
Bentley Bentayga
Bentley Flying Spur (2013) 2014–2019
BMW M760i/Li[44]
Dodge Durango[38][39] SRT Hellcat 6.2 L HEMI V8 Supercharged
Jeep Grand Cherokee (WK2) SRT Trackhawk 6.2 L HEMI V8 Supercharged
Lamborghini Urus
Porsche Cayenne Turbo models only (2018-)
Ram 1500 (DT) TRX 6.2 L HEMI V8 Supercharged (2020–)
Rolls-Royce Ghost Black Badge
Rolls-Royce Wraith (2013) Black Badge
Rolls-Royce Dawn Black Badge
Rolls-Royce Cullinan
Volkswagen Touareg V8 TDI only (2018-)
2018: 3rd Generation
8HP 51 500 N⋅m (369 lb⋅ft) 500 N⋅m (369 lb⋅ft) BMW 2 Series (G42)
BMW 3 Series (G20)
BMW 4 Series (G22)
BMW Z4 (G29)
BMW X3 M40i (G01)
BMW X4 M40i (G02)
Jaguar XE 20d RWD (2019–)
Morgan Plus Four
Toyota GR Supra
8HP 76 760 N⋅m (561 lb⋅ft) 760 N⋅m (561 lb⋅ft) Alpina B7 (G11/12)[55]
Alpina B8
BMW 3 Series (G20/G21) M340dX & 330d & 330dX
BMW 4 Series (G22/G23) M440dX & 430d & 430dX
BMW M3 (G80/G81)
BMW M5 (F90) (2020–)
BMW M8 (F91/F92/F93)
BMW 730d (G11/G12) LCI
BMW 8 Series (G15)
BMW X5 (F95) M
BMW X7
2022: 4th Generation
8HP 80 800 N⋅m (590 lb⋅ft) 800 N⋅m (590 lb⋅ft) BMW 7 Series (G70/G73) BMW X5 (G05)
BMW X5 M (F95)
BMW X6 (G06)
BMW X6 M (F96)
BMW X7(G07 LCI)
Alpina XB7 (G07)
Hongqi Guoya
8HP 100 1,000 N⋅m (738 lb⋅ft) 1,000 N⋅m (738 lb⋅ft) BMW XM (G09) BMW M5 (G90)
1st–3rd Generation
8HP 30 300 N⋅m (221 lb⋅ft) 300 N⋅m (221 lb⋅ft) BMW 1 Series (F20) 116i BMW X1 (E84) CMC Zinger (2023–)
Various
8HP TBD AEBI MT750
Great Wall Pao (2019–)
Great Wall Tank 300 (2020–) Haval H8 (2017–2018)
Ineos Grenadier
VinFast LUX A2.0
VinFast LUX SA2.0
  1. ^ without any claim of completeness

See also

[edit]

References

[edit]
  1. ^ Duane, Salerno (25 April 2019). "Reviewed: Chrysler Group's 8 speed automatic transmission". salernoduanesummit.com. Retrieved 10 May 2019.
  2. ^ "Ram ZF 8 Speed Automatic Transmission TorqueFlite 8 ZF 8HP70". 29 September 2014. Archived from the original on 15 December 2021. Retrieved 10 May 2019 – via YouTube.
  3. ^ "ZF and Chrysler Reach Agreement for new 8-Speed Automatic Transmissions". Retrieved 10 June 2010.
  4. ^ "US Patent 8,105,196 B2: Automatic Transmission Gear And Clutch Arrangement" (PDF). US Patent Office. 31 January 2012. Retrieved 18 November 2024.
  5. ^ a b c Apakidze, Timur (11 March 2014). "Saturation Dive: ZF 8-Speed Automatic". TTAC: The Truth About Cars · Pt. 1. Retrieved 7 July 2019. and "loc. cit. · Pt. 2". 23 April 2014. Retrieved 18 November 2024.
  6. ^ "8-Speed Automatic Transmission". ZF Friedrichshafen AG. Retrieved 19 September 2016.
  7. ^ a b "The freedom to exceed limits" (PDF). brainfunkers.co. ZF Friedrichshafen AG. Retrieved 7 January 2020.
  8. ^ "ZF showcasing second-generation 8HP 8-speed transmission at NAIAS; additional 3% boost in fuel savings". Green Car Congress. Retrieved 13 July 2015.
  9. ^ "Transmission technology from ZF" (PDF). ZF.com. Retrieved 20 February 2018.
  10. ^ a b c Neemann, Andreas (2024). "Automatic Transmission: New Freedom with 8 Gears". Retrieved 15 November 2024.
  11. ^ "Fuel saving and minimizing CO2 emissions". ZF Friedrichshafen AG. Archived from the original on 19 July 2009. Retrieved 18 September 2009.
  12. ^ Hanlon, Mike (4 May 2007). "ZF Develops 8-Sped automatic". Gizmag.
  13. ^ "Maximum driving enjoyment with maximum agility". ZF Friedrichshafen AG. Retrieved 18 September 2009.
  14. ^ a b c d "8HP 70 Repair Manual · Picture 10106" (PDF). 2014. p. 110.
  15. ^ a b "8HP 55A Repair Manual · Picture 10106" (PDF). 2014. p. 169.
  16. ^ a b c d e f g h i 2nd Generation and 3rd Generation "Efficient And Dynamic · ZF Gearbox Brochure" (PDF). 1 September 2017. Retrieved 7 July 2019.
  17. ^ "Der neue BMW M760 Li xDrive. Technische Daten" [The new BMW M760 Li xDrive. Technical data]. www.press.bmwgroup.com (in German). January 2017.
  18. ^ "Technical Data: Alpina Automobiles".
  19. ^ a b c "Specifications of the all-new BMW 3 Series Sedan, valid from 03/2019".
  20. ^ "Technical Data: Alpina Automobiles".
  21. ^ "The first-ever BMW XM". 28 September 2022. Retrieved 15 November 2024.
  22. ^ "Technical Specifications · BMW XM". 28 September 2022. Retrieved 15 November 2024.
  23. ^ "The all-new BMW M5". 26 June 2024. Retrieved 15 November 2024.
  24. ^ "Technical Specifications · BMW M5". 26 June 2024. Retrieved 15 November 2024.
  25. ^ "Progress and efficiency with added variety: additional drive system variants and innovations for the new BMW 7 Series". 28 September 2022. Retrieved 15 November 2024.
  26. ^ "Technical specifications · BMW 7 series · 740d xDrive". 28 September 2022. Retrieved 15 November 2024.
  27. ^ "Technical Data: Alpina Automobiles". 2024. Retrieved 15 November 2024.
  28. ^ a b "Durable and fast – ZF Race Transmissions" (PDF). www.zf.com.
  29. ^ "PowerLine > Powershift Transmission - ZF".
  30. ^ "ZF PowerLine - 8 Speed Automatic Transmission" (PDF). www.zf.com.
  31. ^ "Product Overview - Transmission & E-Mobility Driveline Systems for Trucks & Vans" (PDF). www.zf.com. p. 7.
  32. ^ a b "Data Sheet - PowerLine" (PDF). www.zf.com.
  33. ^ a b Efficient Torque Converter Automatic Transmission for Commercial Vehicles (ZF 8AP) · Winfried Gründler · Herbert Mozer · Frank Sauter: ATZ worldwide 06/2017 · pp. 36–39
  34. ^ "The New Driving Experience - 8-speed automatic transmission ZF-PowerLine" (PDF). www.zf.com.
  35. ^ "New Eight Speed Transmission Introduced by Chrysler". Retrieved 2 September 2011.
  36. ^ "America's First Luxury Sedan With Eight-speed Automatic Transmission". Retrieved 5 September 2011.
  37. ^ "2012 Chrysler Fleet Buying Guide" (PDF). Retrieved 21 July 2011.
  38. ^ a b c d e "SEC filing reveals new V6 and 8-speed transmission for Ram". Retrieved 9 March 2012.
  39. ^ a b c d e "2014 Dodge Durango Bows With Eight-Speed". Retrieved 28 March 2013.
  40. ^ a b c "2013 Ram 1500 Unveiled With Eight-Speed". Retrieved 5 April 2012.
  41. ^ a b c "ZF to Supply 8-Speed Automatic Transmission to new 2013 Ram 1500 Pick-up Truck". ZF Friedrichshafen AG. Retrieved 20 April 2012.
  42. ^ a b c "2013 Ram 1500 Crew Cab SLT 4x4 [w/video]". Autoblog.com. Retrieved 25 August 2012.
  43. ^ Audi. "Audi 8-speed to replace 6-speed automatic across most of range". Motor1.com. Retrieved 4 February 2020.
  44. ^ a b c "Getriebekatalog Abfrage – Technische Daten –" (PDF). zfservis.sk. Retrieved 21 August 2021.
  45. ^ a b "Aston Martin Automatic Gearboxes". JT Automatics Ltd. Archived from the original on 25 April 2016.
  46. ^ "On Tour With More Comfort ZF Delivers 8-Speed Automatic Transmission for New Iveco Daily". Retrieved 16 November 2014.
  47. ^ "2014 Maserati Quattroporte [w/video]". Retrieved 12 December 2012.
  48. ^ "RR ghost specification". Retrieved 21 February 2010.
  49. ^ "New Generation of the 8HP in the BMW 5 Series". Retrieved 20 August 2014.
  50. ^ a b 8HP 75 Data Sheet · p. 4 · Saarbruecken 2016
  51. ^ "2016 BMW 7 Series Sedan: Teutonic Technology". 24 September 2015. Retrieved 24 April 2016.
  52. ^ "BMW Model Year Actions – July and August 2014". Retrieved 24 April 2016.
  53. ^ "New vehicles with ZF technology". Retrieved 18 June 2011.
  54. ^ "New vehicles with ZF technology (Japan)". Retrieved 18 June 2011.
  55. ^ "BMW Alpina B7 Long-wheelbase AWD Technical Data". Retrieved 10 May 2019.
[edit]