This video provides a technical overview and teardown of the Ford 10R80-MHT (Modular Hybrid Transmission), the system used in vehicles like the F-150 Power Boost, Ford Explorer Hybrid, and Lincoln Aviator. The core of the system is a standard 10-speed automatic transmission (10R80) augmented with a bolt-on hybrid module. This module houses a 35 kW (47 hp) three-phase electric motor and a hydraulically-actuated, multi-disk wet clutch known as the "engine disconnect clutch." The motor's rotor is permanently welded to the torque converter, while the disconnect clutch allows the engine's crankshaft to be engaged or disengaged from the rotor. This P2 parallel hybrid architecture enables three primary modes of operation: electric-only driving, hybrid mode where the motor assists the engine (Power Boost) or acts as a generator, and regenerative braking to recapture energy. The video also details supporting components, including the dual oil pump system (mechanical and electric) and the use of transmission fluid to cool the motor's stator.
0:00 Introduction to the 10R80-MHT: The video introduces the Ford 10R80-MHT, a hybrid version of the standard 10-speed automatic transmission. It's used in the F-150 (as "Power Boost"), Explorer Hybrid, and Lincoln Aviator. MHT stands for Modular Hybrid Transmission.
0:54 The Modular Design: The "modular" aspect is a self-contained unit that bolts onto the bell housing of a standard 10-speed transmission. This module contains a powerful three-phase electric motor (stator and rotor).
2:03 Powertrain Connection: The engine's crankshaft is connected to a dual-mass flywheel. This flywheel is splined to an input shaft that engages a clutch pack. The motor's rotor is permanently welded to the outside of the transmission's torque converter.
4:18 The Engine Disconnect Clutch: A key component is a multi-disk wet clutch pack that can hydraulically connect or disconnect the engine from the electric motor/torque converter assembly. This allows the system to operate with or without the engine running.
5:55 Operating Mode 1: Electric-Only: With the engine disconnect clutch disengaged, the 35 kW (47 hp) electric motor can propel the vehicle on its own, shifting through all 10 gears of the transmission.
6:57 P2 Parallel Hybrid Architecture: The system is classified as a P2 parallel hybrid because the electric motor is located between the engine and the transmission, with a clutch to disconnect the engine. This allows for efficient transfer of both engine and motor torque to the wheels.
8:41 Operating Mode 2: Hybrid (Power Boost): When the engine disconnect clutch is engaged, the engine and motor work in tandem. The engine can drive the wheels directly, the motor can act as a generator to recharge the battery, or it can provide additional torque to assist the engine for maximum performance—a feature Ford markets as "Power Boost."
10:16 Operating Mode 3: Regenerative Braking: During deceleration, the momentum of the vehicle spins the rotor, causing the motor to act as a generator. This creates braking force that slows the vehicle while simultaneously recapturing kinetic energy to recharge the high-voltage battery.
10:55 Stator Cooling System: The electric motor's stator windings generate significant heat. The transmission is designed with special fluid passages that circulate transmission fluid over the windings to cool them effectively.