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Video Axle Drive
Video Rear Axle Drive
Video FWD (classic)
Video Front Axle Drive
Video Ring and Pinion
Video Hypoid Gearbox 1
Video Hypoid Gearbox 2
Video Differential 1
Video Differential 2
Video Locking Differential 1
Video Locking Differential 2
Video Locking Differential 3
Video Self locking 1
Video Self locking 2
Video FWD (cross) 1
Video FWD (cross) 2
Video FWD (cross) 3
Video FWD (longitudinal) 1
Video FWD (longitudinal) 2
Video RWD (front engine) 1
Video RWD (front engine) 2
Video RWD (front engine) 3
Video RWD (rear engine)
Video Mid-mounted Engine
Video Transaxle Drive
Video Planetary Power Axle
Video Smart Drive (f. view)
Video Smart Drive (s. view)
Video Powertrain Position
Video Bus with Low Floor
Video Tractive Power
Video All-wheel Drive
Video All-wheel History 1
Video All-wheel History 2
Video All-wheel History 3
Video All-wheel History 4
Video All-wheel History 5
Video All-wheel History 6
Video All-wheel Automatic
Video All-wheel Longitudinal 1
Video All-wheel Longitudinal 2
Video All-wheel Longitudinal 3
Video All-wheel Transverse 1
Video All-wheel Transverse 2
Video All-wheel Rear Engine
Video All-wheel Cable Winch
Video Ferrari FF
Video Bosch Hydro Drive
Video Locking Differential
Video Viscous Clutch
Video Torsen-differential 1
Video Torsen-differential 2
Video Electr. Differential Lock
Video Distrib. gearing 1
Video Distrib. gearing 2
Video Distrib. gearing 3
Video Distrib. gearing 4
Video Propeller Shafts 1
Video Propeller Shafts 2
Video Cardan Shaft
Video Cardan Joint
Video Constant Velocity Joint
Video Universal Joint
Video Universal joint (working)
Video Ball Joint
Video Dry Joint 1
Video Dry Joint 2
Video Driving Chain

Video Force
Video Torque
Video Piston force

Video Axle drive 1
Video Axle drive 2
Video Axle drive 3

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


The differential transmission shall distribute the torque when multi-track vehicles with two drive wheels or four-wheel drive and at the same time rotational speed differences compensate, e.g. when cornering. It thus reduces the wear of possibly scraping tyres.

It is also called 'differential'. The spur-wheel differential uses planet gears to compensate, however, this mostly occurs through four bevel wheels (picture above) which are all meshed with each other.

The drive takes place via the casing (picture 2) on two opposing to each other compensating bevel wheels. When driving straight ahead they do not rotate. The whole bevel wheel gear-set revolves as a block and transmits the torque to both axle shaft wheels evenly.

Only when there are rotational speed differences (e.g., when cornering) between the two axle shaft wheels, both differential bevel pinions rotate in opposite direction on their shafts in the casing. The torque is always evenly distributed to both driven wheels. The wheel with the greatest slip determines the transferable torque. It is the highest when the slip of both wheels is about 0% - precisely 0% is impossible when driving. To prevent wheel-spinning of a driven wheel, and to achieve the transferable torque, a differential lock is necessary.

With rotational speed differences between the side gears, the one wheel rotates accordingly slower as the other wheel rotates faster. In extreme cases, one wheel stands still, while the other turns twice as fast. Differential gears also exists between the axles of a permanent all-wheel drive. The picture above shows that also the middle rotational speeds of the front and rear axles differ when cornering. 05/15               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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