|Aisin AW’s own HD-10 2-motor FWD hybrid system.|
Aisin Seiki Co., an affiliate of Toyota Motor Corp., plans to increase its supply of core motor systems for hybrid vehicles to Ford Motor Co., according to The Nikkei.
The Ford Escape Hybrid and Mercury Mariner Hybrid are equipped with Ford’s first-generation transaxle, which Ford developed jointly with Aisin AW, a subsidiary of Aisin Seiki. In 2008, the Ford Fusion Hybrid and Mercury Milan Hybrid will come equipped with Ford’s second-generation transaxle.
Aisin also supplied Toyota with the transaxle for the first-generation Prius. In 2005, Ford said that it would develop its third-generation transaxle in-house. (Earlier post.)
Aisin has supplied dual-motor systems to Ford since 2004, with shipments currently reaching around 20,000 systems a year.
Looking to expand its lineup of hybrid vehicles, Ford has asked Aisin to increase output. The automaker also has asked Aisin to develop a new dual-motor system for its next-generation small and midsize hybrid sedans.
Aisin AW currently offers two different two-motor hybrid drive systems, the HD-10 for front-wheel drive and the HR-10 for rear-wheel drive. The HD-10 is a compact system that integrates ECU and inverter into the transmission. The HR-10 offers a two-stage motor speed reduction device to enable a compact design. The hybrid system in the Lexus GS 450h is the first to use a two-stage reduction device. (Earlier post.)
|Aisin AW 2-Motor Hybrid Systems|
|Parameter||HD-10 FWD||HR-10 RWD|
|Torque Capacity (Nm)||170||530|
|Motor Output (kW)||Traction||65||147|
The HD-10 uses an engine gear ratio of 3.781 and a motor gear ratio of 10.706. The HR-10 with the two-stage reduction device offers a low gear ratio of 3.900 and a high gear ratio of 1.900.