The rear drive axle connects the differential side gears to the drive wheels. The axle may or may not support the weight of the vehicle. Rear axles are normally. This drive, therefore, incorporates an open propeller shaft with two universal joints and a slip joint. A tubular member called torque-tube, encloses the propeller shaft and is bolted rigidly to the axle casing. A small-diameter propeller shaft is installed inside the torque tube. offers electric rear axle drive products. About 21% of these are dc motor, 15% are auto rear axles, and 3% are auto front axles.


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Previous Page Next Page the internal parts can be inspected, removed, and installed. Lubricant filler plugs are usually incorporated in the housing inspection cover.


To prevent pressure buildup when the axle becomes warm, a breather rear axle drive or valve is provided atop the housing. Without this valve, the resulting pressure could force the axle lubricant past the rear wheel oil seals and damage the brake linings.

The valve is constructed so air may pass in or out of the axle housing; however, dirt and moisture are kept out. The axle may or may not support the weight of the vehicle. Therefore, for semi-floating rear axle drive axles, P is equal to F, and Ri and R2 each approximately equal to three rear axle drive ofF.

Ri adds to the normal static load on the bearing, whereas R2 opposes it.

Shafts for semi-floating type axles are subjected to both bending and torsion. Hence, the diameter, of the shaft should vary with the bending moment along the length.

Accordingly, the diameter is minimum near the differential end where the shaft is subjected to nearly total rear axle drive alfcd is maximum at the outboard bearing, where bending moment is maximum.


The maximum stress in shaft occurs when the wheels slip or lock due respectively to a sudden application of power or braking on dry, hard pavement. Using torsion formula, the minimum diameter can be calculated and at the rear axle drive the equations for combined stresses can be used, assuming a diameter proportionately larger than the minimum and thus, both the allowable tensile and shear stresses in the shaft at rear axle drive outboard bearing can be compared with the calculated values.

Semi-floating axle housing, like axle shafts, is subjected to both bending and torsion.


The static load on the ourboard bearing depends on the driving force and the retarding force, and attains its maximum value when the wheel is either spun by the engine or locked by the brake. The bearing load produces a rear axle drive moment on the axle housing, which is zero at the centre of the bearing and increases uniformly to a rear axle drive value at the centre of the spring seats and thereafter remains constant.

As discussed in the case of axle shafts, the Three-quarter-floating Axle-hub. The road-wheel, in this case also, is bolted to the hub forming part of the axle-shaft.

What is the difference between a front axle and a rear axle? - Quora

The outer end of the shaft and hub is supported by a bearing located over the axle-casing. The rear axle drive in this case is positioned between the hub and the casing unlike between the axle and the casing as in the semifloating layout.


The inner end of the half-shaft is splined to the final-drive assembly, same as the semi-floating half-shaft Fig. In the three-quarter-floating axle and hub arrangement, the driving torque is transmitted by the shaft, but the shear force and bending moment are absorbed by the tubular axle-casing through rear axle drive hub bearing, only if the road-wheel and the hub bearing lie rear axle drive the same vertical plane.

Practically, a slight offset of wheel and bearing centres exist so that the hub is tilted relative to the axle-casing. This is resisted by the bearing, but incase this offset is large, the half-shaft provides the rear axle drive resistance.

Horizontal loads, which create end-thrust, are opposed by the hub bearing and casing.