Rear Axle

Rear Axle


a group of subassemblies or a separate unit of a motor-vehicle chassis (such as an automobile and tractor) that transmits torque from the propellor shaft or directly from the gear box to the propelling mechanism.

In most motor vehicles the rear axle has a housing, tubes for the axle shafts, a final drive (including the differential with reduction gears), and the axle shafts. The final drive and axle shafts are part of the motor-vehicle transmission. Wheel brakes are mounted on the rear axle, as are the hubs for the wheels. The rear axle is joined to the frame or body of the motor vehicle (to the supporting body if the motor vehicle has no frame) by a suspension. When the rear wheels are independently suspended, the differential is attached directly to the frame of the motor vehicle, and in this case the pivoting axle shafts have ball-and-socket joints. The housing of the rear axle is a hollow supporting beam and is the axle of the automobile. The housings are cast of steel or malleable cast iron or are stamped and welded. The tubular casings of the axle shafts are pressed or welded into the housing of the rear axle and form a unit with it.

The rear axle housings can be made so they can be dismantled (vertically). A housing that can be dismantled consists of two parts joined by bolts. The final drive is in the middle, wide part of the housing. In a rear axle with a housing that cannot be dismantled, the final drive has a separate housing that is fastened by bolts to the middle part of the housing. The wide middle part of the housing reduces the road clearance of the motor vehicle and makes it necessary to increase the height of the floor. In order to decrease the dimensions of this part of the housing (which is especially important for heavyduty vehicles and for buses), the reduction gear of the final drive is made smaller by introducing additional, so-called wheel, gearing.


References in periodicals archive ?
1, 2015 /PRNewswire/ -- Freudenberg-NOK Sealing Technologies has been named the Rear Axle Supplier of the Year by Meritor, Inc.
A sport differential acting on the rear axle is standard and enables active torque distribution between the inside and outside wheel.
If the rear axle shaft was not properly heated treated, it may fracture and a wheel separation could occur, increasing the risk of a crash.
Rear Axle is Limited to 19,000-lb GAWR with Code 04091
The components of the new 4MATIC include the power take-off to the rear axle, which is integrated into the 7G-DCT automated dual clutch transmission, and the rear-axle gear unit with integrated, hydraulically actuated multi-disc clutch.
Available in two wheelbases, two heights, two gross vehicle weights, a pair of trim levels and with four engine choices, the Combo boasts the highest payload, highest rear axle capacity and longest wheelbase in its sector.
An electric motor will be mounted over the rear axle with its battery fitting into a centre section running down the middle of the car.
Hitch any load only to the tractor's drawbar or a three-point hitch mechanism, which are lower than the rear axle.
A number of researches have proposed various mechanisms for the steering box of the rear axle to fulfill the requirements of the integral steering, highlighting papers (Fraukawa, 1985) for steering box with 4R linkage,--driven by two cranks; as well as paper (Kido, 1990)--for steering box with cam mechanisms (cam with a pair of cam followers which are hold by a follower support).
4-litre unit already featured in the RS Spyder racing car and positioned in front of the rear axle, giving the car the optimum performance set-up.
ADPnews) - Sep 4, 2009 - Austrian Magna Steyr, a unit of Canadian Magna International (NYSE:MGA), is to land a new order from Swedish carmaker AB Volvo (STO:VOLV B) for the production of the rear axle of the company's hybrid model of its XC60 SUV.
Using a clever electric motor in the rear axle, it can run on front, all-wheel or rear-wheel drive, using petrol or electric power.