The High Mobility Multipurpose Wheeled Vehicle (HMMWV), commonly known as the Humvee, is a four-wheel drive military light truck produced by AM General.
Primarily used by the United States military, it is also used by numerous other countries and organizations and even in civilian adaptations. The Humvee’s widespread use in the Gulf War of 1991, where it negotiated the treacherous desert terrain, helped inspire civilian Hummer versions.
The Humvee seats 4 with an available fully enclosed metal cabin with a vertical windshield. The body is constructed from lightweight and rust-resistant aluminum, instead of conventional steel. It has all-wheel drive with an independent suspension and helical gear-reduction hubs similar to portal axles which attach towards the top rather than center of each wheel to allow the drivetrain shafts to be raised for a full 16 in (410 mm) of ground clearance.
The body is mounted on a narrow steel frame with boxed rails and five cross members for rigidity. The rails act as sliders to protect the drivetrain which is nestled between and above the rails. Raising the drivetrain into the cabin area and lowering the seats into the frame creates a massive chest-high transmission hump which separates passengers on each side and lowers the overall center of gravity compared to most trucks where the body and passengers are above the frame.
The vehicle also has disc brakes on all 4 wheels, and 4-wheel Portal axle double-wishbone suspension. The brake discs are not mounted at the wheels as on conventional automobiles, but are inboard, attached to the outside of each differential. The front and rear differentials are Torsen type, and the center differential is a regular, lockable type.
Torque-biasing differentials allows forward movement as long as at least one wheel has traction. It runs on specialized 37 × 12.5 radial tires with low-profile runflat devices. Some HMMWVs are equipped with an optional central tire inflation system (CTIS), which enables pressure to be lowered for soft ground or raised for hard pavement.
Weight: 5,200–5,900 lb (2,359–2,676 kg) curb weight
Length: 15 ft (4.57 m) wheelbase 10 ft 10 in (3.30 m)
Width: 7 ft 1 in (2.16 m)
Height: 6 ft (1.83 m), reducible to 4 ft 6 in (1.37 m)
V8 turbo diesel: 6.5 L (400 cu in): 190 hp (142 kW) @ 3,400 rpm / 380 lbf·ft (515 N·m) @ 1,700 rpm
Transmission: 3-speed automatic or 4-speed automatic
Suspension: Independent 4×4
Fuel capacity: 25 U.S. gal (95 L)
Speed: 55 mph (89 km/h) at max gross weight, over 70 mph (113 km/h) top speed