The design of the bridges of the ZIL-131 car

The rear and middle axles of the car are driving.

Front axle - steered and driven

The arrangement of the rear and middle axles is shown in fig. 1.

ZIL-131 middle and rear axle hub

ZIL-131 middle and rear axle reducer

The gear arrangement of the rear, middle and front axles is shown in fig. 2 and 3.

The device of the steering knuckle and the front axle wheel drive is shown in fig. 4.

Axle main gears are double, consisting of a pair of bevel gears with helical teeth and a pair of spur gears with oblique teeth.

1.727 bevel gear ratio, 4.25 cylindrical gear ratio and 7.339 overall gear ratio.

Reducers (Fig. 2) of the rear and middle axles are installed on top of the axle housing and are attached to it with a horizontal flange.

Rear and middle axle gearboxes have the following difference.

Flanges 29 and 33 are installed on both ends of the shaft of the drive bevel gear of the middle axle reducer for mounting cardan shafts. A larger flange 33 is installed on the front end of the shaft, and a smaller flange 29 is installed on the rear end of the shaft.

Tapered roller bearing 31 is closed by cover 28 with an oil seal installed in it.

Thrust washer 30 of the inner ring of the roller bearing is equipped with an oil drain groove with a right-handed helix and is stamped C on the end.

Middle and rear axle gearbox with ZIL-131 differential

At the front end of the drive bevel gear shaft of the rear axle reducer, a flange 21 is installed, which has the same dimensions as the flange 29 of the rear end of the shaft of the middle axle reducer.

A spacer sleeve 26 is installed instead of a flange at the rear end of the shaft of the rear axle gearbox, and the tapered roller bearing and the end of the shaft are closed with a blind cover.

Middle and rear axle gearbox with ZIL-131 differential

Thrust washer 27 does not have an oil drain groove. Otherwise, the details of the gearboxes of the rear and middle axles are the same.

The gearbox (Fig. 3) of the front axle is attached to the axle housing with a vertical flange.

Gears, differentials, bearing housings, drive bevel gear shaft flange 24 and all bearings except bearing 29 of the front end of the drive bevel gear shaft of the front axle reduction gear are the same as the parts of the rear axle reduction gear.

Thrust washer 22 of the inner ring of the tapered roller bearing of the drive bevel gear has an oil-removing groove with a left-handed helix direction and is stamped P on the end.

Front axle reducer with ZIL-131 differential

A puller bolt 27 is installed in the cover 26 (see Fig. 1) of the right hatch of the crankcase of the rear and middle axle reduction gear, which serves to press the reaction rod pin out of the upper reaction arm of the rear suspension.

In the flange of the cover 32 (Fig. 3) of the double-row tapered roller bearing of the spur gear of the front axle reduction gear, there is a threaded hole in which a plug 31 is screwed for storage, used to close the hole in the clutch housing when overcoming the ford.

Drive to front axle ZIL-131

The front drive axle is equipped with steering knuckles and a steering linkage.

At the base of the steering link arms, thrust bolts are screwed into the housings of the steering knuckles and welded to limit the angles of rotation of the wheels.

The half shafts 22 (Fig. 4) of the front drive axle are equipped with ball joints of constant angular velocity.

On the necks of the semi-axes of the rear and middle axles, as well as on the necks of the fists of the hinges of the semi-axes of the front drive axle, there are heads 32 (Fig. 4) and 22 (see Fig. 1) for supplying air to the wheel tires.

Tire valves 6 are installed on the outer ends of the flanges of the axle shafts (see Fig. 1 and 4).

In the upper walls of the gearbox housings of all axles there are filling holes closed with plugs.

Through these holes, you can check the condition of the teeth of the bevel gears and the correct contact pattern.