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Automatic transmission models From Wikipedia, the free encyclopedia
The ZF 8HP transmission is ZF Friedrichshafen AG's trademark name for its 8-speed automatic transmission models for longitudinal engine applications. The name is short for 8-speed transmission with hydraulic converter and planetary gearsets. 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.
ZF 8HP | |
---|---|
Overview | |
Manufacturer | ZF Friedrichshafen |
Production | 2008–present |
Body and chassis | |
Class | 8-speed automatic transmission |
Related | GM 8L · MB 9G-Tronic · ZF 9HP |
Chronology | |
Predecessor | ZF 6HP |
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]
Gear Model |
R | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Total Span |
Span Center |
Avg. Step |
Compo- nents |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
8HP 70 · 2008 | −3.297 | 4.696 | 3.130 | 2.104 | 1.667 | 1.285 | 1.000 | 0.839 | 0.667 | 7.043 | 1.769 | 1.322 | 4 Gearsets 2 Brakes 3 Clutches |
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 · 8HP 80 | −3.993 | 5.500 | 3.520 | 2.200 | 1.720 | 1.317 | 1.000 | 0.823 | 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 |
One of the main aims of the ZF 8HP transmission is to improve vehicle fuel economy with extra speeds. Compared to the six-speed ZF 6HP transmission it uses 12 % less fuel, and 14 % less than a 5-speed transmission.[4][5] Due to changes in internal design, the shift times have reduced to 200 milliseconds; additionally, the unit brings the ability to shift in a non-sequential manner – going from gear 8 to gear 2 in extreme situations.[6] In the 8HP 70 version, it has a torque handling limit of 700 N⋅m (516 lb⋅ft), and weighs 87 kg (192 lb).[7]
First generation 8HP products were released starting in 2010. 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.[8] 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.[8]
Second generation 8HP products were released starting in 2014. Efficiency improvements over the original design and the first generation include a wider ratio spread 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.[9] ZF estimated fuel economy improvement over first generation 8HP kits to be 3 %. Refinements were also made with respect to vibration.
Third generation 8HP products were released starting in 2018. Major improvements are total spread 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.[10]
With Assessment | Planetary Gearset: Teeth[lower-alpha 1] | Count | Total[lower-alpha 2] Center[lower-alpha 3] |
Avg.[lower-alpha 4] | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Model Type |
Version First Delivery |
S1[lower-alpha 5] R1[lower-alpha 6] |
S2[lower-alpha 7] R2[lower-alpha 8] |
S3[lower-alpha 9] R3[lower-alpha 10] |
S4[lower-alpha 11] R4[lower-alpha 12] |
Brakes Clutches |
Ratio Span |
Gear Step[lower-alpha 13] | ||
Gear Ratio |
R |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 | |
Step[lower-alpha 13] | [lower-alpha 14] | [lower-alpha 15] | ||||||||
Δ Step[lower-alpha 16][lower-alpha 17] | ||||||||||
Shaft Speed |
||||||||||
Δ Shaft Speed[lower-alpha 18] |
||||||||||
8HP 70[lower-alpha 19] | 700 N⋅m (516 lb⋅ft) 2008 |
48[11] 96 |
48[11] 96 |
69[12] 111 |
23[12] 85 |
2 3 |
7.0435 1.7693 |
1.3216[lower-alpha 13] | ||
Gear Ratio |
−3.2968[lower-alpha 14] |
4.6957 |
3.1304[lower-alpha 17] |
2.1039 |
1.6667[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.2845[lower-alpha 17] |
1.0000 |
0.8392[lower-alpha 17][lower-alpha 18] |
0.6667 | |
Step | 0.7021[lower-alpha 14] | 1.0000 | 1.5000 | 1.4879 | 1.2623[lower-alpha 13] | 1.2975 | 1.2845 | 1.1917 | 1.2587 | |
Δ Step[lower-alpha 16] | 1.0081[lower-alpha 17] | 1.1787 | 0.9729[lower-alpha 17] | 1.0101[lower-alpha 17] | 1.0779 | 0.9467[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.8382 | 1.0401 | 0.9000[lower-alpha 18] | 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[lower-alpha 13] | ||
Gear Ratio |
−3.2952[lower-alpha 14] |
4.7143 |
3.1429[lower-alpha 17] |
2.1064 |
1.6667[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.2854[lower-alpha 17] |
1.0000 |
0.8387[lower-alpha 17][lower-alpha 18] |
0.6667 | |
Step | 0.6990[lower-alpha 14] | 1.0000 | 1.5000 | 1.4921 | 1.2638[lower-alpha 13] | 1.2966 | 1.2854 | 1.1923 | 1.2581 | |
Δ Step[lower-alpha 16] | 1.0053[lower-alpha 17] | 1.1805 | 0.9747[lower-alpha 17] | 1.0087[lower-alpha 17] | 1.0781 | 0.9477[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.8390 | 1.0467 | 0.9066[lower-alpha 18] | 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 1.7728 |
1.3224[lower-alpha 13] | ||
Gear Ratio |
−3.3168[lower-alpha 14] |
4.7143 |
3.1429[lower-alpha 17] |
2.1064 |
1.6667[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.2847[lower-alpha 17] |
1.0000 |
0.8392[lower-alpha 17][lower-alpha 18] |
0.6667 | |
Step | 0.7036[lower-alpha 14] | 1.0000 | 1.5000 | 1.4921 | 1.2638[lower-alpha 13] | 1.2973 | 1.2847 | 1.1917 | 1.2587 | |
Δ Step[lower-alpha 16] | 1.0053[lower-alpha 17] | 1.1806 | 0.9742[lower-alpha 17] | 1.0098[lower-alpha 17] | 1.0781 | 0.9467[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.8410 | 1.0447 | 0.9036[lower-alpha 18] | 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 1.7728 |
1.3224[lower-alpha 13] | ||
Ratio | −3.3168[lower-alpha 14] | 4.7143 | 3.1429[lower-alpha 17] | 2.1064 | 1.6667[lower-alpha 13][lower-alpha 17][lower-alpha 18] | 1.2847[lower-alpha 17] | 1.0000 | 0.8392[lower-alpha 17][lower-alpha 18] | 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 1.7889 |
1.3413[lower-alpha 13] | ||
Gear Ratio |
−3.4560[lower-alpha 14] |
5.0000 |
3.2000[lower-alpha 17] |
2.1429 |
1.7200[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.3139[lower-alpha 17] |
1.0000 |
0.8221[lower-alpha 17][lower-alpha 18] |
0.6400 | |
Step | 0.6912[lower-alpha 14] | 1.0000 | 1.5625 | 1.4933 | 1.2458[lower-alpha 13] | 1.3091 | 1.3139 | 1.2163 | 1.2846 | |
Δ Step[lower-alpha 16] | 1.0463[lower-alpha 17] | 1.1986 | 0.9517[lower-alpha 17] | 0.9964[lower-alpha 17] | 1.0802 | 0.9469[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.8986 | 1.1944 | 1.0817[lower-alpha 18] | 1.7308 | |
8HP 75/II[14] 8HP 95[lower-alpha 20] |
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[lower-alpha 13] | ||
Gear Ratio |
−3.4783[lower-alpha 14] |
5.0000 |
3.2000[lower-alpha 17] |
2.1429 |
1.7200[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.3131[lower-alpha 17] |
1.0000 |
0.8226[lower-alpha 17][lower-alpha 18] |
0.6400 | |
Step | 0.6957[lower-alpha 14] | 1.0000 | 1.5625 | 1.4933 | 1.2458[lower-alpha 13] | 1.3099 | 1.3131 | 1.2156 | 1.2853 | |
Δ Step[lower-alpha 16] | 1.0463[lower-alpha 17] | 1.1986 | 0.9511[lower-alpha 17] | 0.9975[lower-alpha 17] | 1.0802 | 0.9458[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.9008 | 1.1922 | 1.0781[lower-alpha 18] | 1.7344 | |
2018: 3rd Generation | ||||||||||
8HP 76/I[lower-alpha 21] | 760 N⋅m (561 lb⋅ft) | 48 96 |
54 96 |
69 111 |
24 96 |
2 3 |
7.8125 1.7889 |
1.3413[lower-alpha 13] | ||
Ratio | −3.4783[lower-alpha 14] | 5.0000 | 3.2000[lower-alpha 17] | 2.1429 | 1.7200[lower-alpha 13][lower-alpha 17][lower-alpha 18] | 1.3131[lower-alpha 17] | 1.0000 | 0.8226[lower-alpha 17][lower-alpha 18] | 0.6400 | |
8HP 30/III[lower-alpha 22] 8HP 51[lower-alpha 23] |
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[lower-alpha 13] | ||
Gear Ratio |
−3.7120[lower-alpha 14] |
5.2500 |
3.3600[lower-alpha 17] |
2.1724 |
1.7200[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.3161[lower-alpha 17] |
1.0000 |
0.8221[lower-alpha 17][lower-alpha 18] |
0.6400 | |
Step | 0.7070[lower-alpha 14] | 1.0000 | 1.5625 | 1.5467 | 1.2630[lower-alpha 13] | 1.3069 | 1.3161 | 1.2163 | 1.2846 | |
Δ Step[lower-alpha 16] | 1.0102[lower-alpha 17] | 1.2246 | 0.9664[lower-alpha 17] | 0.9931[lower-alpha 17] | 1.0820 | 0.9469[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.9369 | 1.2608 | 1.1358[lower-alpha 18] | 1.8173 | |
8HP 76/II[lower-alpha 24] 8HP 80[lower-alpha 25] |
760 N⋅m (561 lb⋅ft) 800 N⋅m (590 lb⋅ft) |
48 96 |
54 96 |
69 111 |
24 108 |
2 3 |
8.5938 1.8762 |
1.3597[lower-alpha 13] | ||
Gear Ratio |
−3.9930[lower-alpha 14] |
5.5000 |
3.5200[lower-alpha 17] |
2.2000 |
1.7200[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.3172[lower-alpha 17] |
1.0000 |
0.8226[lower-alpha 17][lower-alpha 18] |
0.6400 | |
Step | 0.7260[lower-alpha 14] | 1.0000 | 1.5625 | 1.6000 | 1.2791[lower-alpha 13] | 1.3058 | 1.3172 | 1.2156 | 1.2853 | |
Δ Step[lower-alpha 16] | 0.9766[lower-alpha 17] | 1.2509 | 0.9796[lower-alpha 17] | 0.9913[lower-alpha 17] | 1.0836 | 0.9458[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.9777 | 1.3246 | 1.1859[lower-alpha 18] | 1.8321 | |
2016: Racing Cars | ||||||||||
8P 45R[lower-alpha 26] | 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 TBD |
1.2275[lower-alpha 13] | ||
Ratio | TBD | TBD | TBD | TBD | TBD | TBD | 1.0000 | TBD | TBD | |
2017: Commercial Vehicles[lower-alpha 27] | ||||||||||
8AP 600 T[lower-alpha 28] 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)[lower-alpha 29] |
65[lower-alpha 30] 115 |
65[lower-alpha 30] 115 |
62 122 |
27 105 |
2 3 |
7.6522 1.7673 |
1.3374[lower-alpha 13] | ||
Gear Ratio |
−4.2501[lower-alpha 14] |
4.8889 |
3.1235[lower-alpha 17] |
2.0334 |
1.6389[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.2541[lower-alpha 17] |
1.0000 |
0.8400[lower-alpha 17][lower-alpha 18] |
0.6389 | |
Step | 0.8693[lower-alpha 14] | 1.0000 | 1.5652 | 1.5361 | 1.2407[lower-alpha 13] | 1.3068 | 1.2541 | 1.1905 | 1.3148 | |
Δ Step[lower-alpha 16] | 1.0190[lower-alpha 17] | 1.2381 | 0.9494[lower-alpha 17] | 1.0420[lower-alpha 17] | 1.0535 | 0.9054[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.9153 | 0.9906 | 0.9311[lower-alpha 18] | 1.8322 | |
8AP 1200 S [lower-alpha 31] |
1,200 N⋅m (885 lb⋅ft)[lower-alpha 29] | 65[lower-alpha 30] 115 |
65[lower-alpha 30] 115 |
65[lower-alpha 30] 115 |
27 105 |
2 3 |
7.6522 1.7673 |
1.3374[lower-alpha 13] | ||
Gear Ratio |
−3.7569[lower-alpha 14] |
4.8889 |
3.1235[lower-alpha 17] |
2.0334 |
1.6389[lower-alpha 13][lower-alpha 17][lower-alpha 18] |
1.2676[lower-alpha 17] |
1.0000 |
0.8305[lower-alpha 17][lower-alpha 18] |
0.6389 | |
Step | 0.7685[lower-alpha 14] | 1.0000 | 1.5652 | 1.5361 | 1.2407[lower-alpha 13] | 1.2929 | 1.2676 | 1.2041 | 1.2999 | |
Δ Step[lower-alpha 16] | 1.0190[lower-alpha 17] | 1.2381 | 0.9596[lower-alpha 17] | 1.0200[lower-alpha 17] | 1.0527 | 0.9263[lower-alpha 17] | ||||
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[lower-alpha 18] | 0.8738 | 1.0321 | 0.9979[lower-alpha 18] | 1.7654 | |
Ratio R & Even |
||||||||||
Ratio Odd |
||||||||||
Algebra And Actuated Shift Elements[lower-alpha 32] | ||||||||||
Brake A[lower-alpha 33] | ❶ | ❶ | ❶ | ❶ | ❶ | |||||
Brake B[lower-alpha 34] | ❶ | ❶ | ❶ | ❶ | ❶ | ❶ | ||||
Clutch C[lower-alpha 35] | ❶ | ❶ | ❶ | ❶ | ❶ | |||||
Clutch D[lower-alpha 36] | ❶ | ❶ | ❶ | ❶ | ❶ | ❶ | ||||
Clutch E[lower-alpha 37] | ❶ | ❶ | ❶ | ❶ | ❶ | |||||
| ||||||||||
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