Drive Shafts

Vehicles
An automobile may use a longitudinal shaft to deliver power from an engine/transmission to the other end of the vehicle before it goes to the wheels. A pair of short drive shafts is commonly used to send power from a central differential, transmission, or transaxle to the wheels.
 

Front-engine, rear-wheel drive
In front-engine, rear-wheel-drive cars, a long drive shaft transfers power to the rear axle. Common designs include the torque tube (one universal joint) and standard driveshafts (two or more joints). Most have the engine and gearbox at the front, with the driveshaft inactive when stationary. For better weight balance, some models use a rear transaxle, making the driveshaft spin constantly with the engine. Porsche’s system uses an engine-mounted clutch to disconnect the driveshaft, letting the engine rev freely during gear changes and reducing inertia. Its rigid torque tube also stabilizes alignment and resists torque twist. Half-shafts connect the rear differential to each wheel. Early cars often used chains, belts, or electric motors instead of drive shafts.

Four wheel and all-wheel drive

These evolved from front-engine rear-wheel drive. A transfer case between the transmission and axles splits drive to both axles, often with reduction gears, a dog clutch or differential. At least two drive shafts connect the transfer case to each axle; in some larger vehicles, a short drive shaft drives the centrally mounted transfer box. On such vehicles, the front drive shaft is shorter and more articulated, requiring more reliable or complex universal joints.

Modern light AWD cars often use a front-wheel drive–based layout: the transmission and front final drive are combined with the engine, and a single drive shaft runs to the rear axle. This design, with torque biased to the front, provides car-like handling.

The automotive sector
Drive shafts are extensively used in four-wheel drive and rear-wheel drive vehicles to transfer power from the engine to the differential, propelling the vehicle’ s wheels.
 

The aerospace industry
Helicopters and aircraft rely on drive shafts within their transmission systems to transmit power from the engine to the rotors or propellers, facilitating flight.
 

The maritime industry
Ships and boats utilise drive shafts to transfer power from the engine to the propeller, enabling propulsion through water.
 

Industrial machinery sector
Drive shafts are an integral part of a wide range of industrial machinery, including agricultural equipment, conveyors, and manufacturing machinery, where they transmit power from engines to motors to various working parts.
 

Two-wheeled vehicles
Some motorcycles and bicycles incorporate drive shafts as an alternative to chain or belt drives, transferring power from the engine or motor to the rear wheel for propulsion.
 

Construction equipment
Drive shafts play a critical role in various construction machineries, such as cranes, loaders, and excavators. They transmit power from engines or motors to enable movement and operation.
 

Power generation industry
Drive shafts connect generators and turbines in power plants, facilitating the transmission of power from the generators to the turbines for electricity generation. 

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