Main gear and axle shafts of the rear and middle axles, differential of the front, rear and middle axles on the ZIL-131

Axles of the ZIL-131 car

Design of axles of the ZIL-131 car

The rear and middle axles of the car are driving.

Front axle - steered and driven

The structure of the rear and middle axles is shown in Fig. 1.

The design of the rear, middle and front axle gearboxes is shown in Fig. 2 and 3.

The design of the steering knuckle and the front axle wheel drive is shown in Fig. 4.

The main gears of the bridges are double, consisting of a pair of bevel gears with spiral teeth and a pair of cylindrical gears with oblique teeth.

The gear ratio of the bevel pair is 1.727, the gear ratio of the cylindrical pair is 4.25 and the total gear ratio of the gearbox is 7.339.

The gearboxes (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.

The gearboxes of the rear and middle axles have the following differences.

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

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

The thrust washer 30 of the inner ring of the roller bearing is equipped with an oil-removal groove with a right-hand spiral direction and has a C mark on its end.

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

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

The thrust washer 27 does not have an oil removal groove. Otherwise, the details of the rear and middle axle gearboxes 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, flange 24 of the drive bevel gear shaft and all bearings, except bearing 29 of the front end of the drive bevel gear shaft of the front axle gearbox, are the same as the parts of the rear axle gearbox.

The thrust washer 22 of the inner ring of the tapered roller bearing of the drive bevel gear has an oil-removal groove with a left-hand spiral direction and a P stamp on the end.

In the cover 26 (see Fig. 1) of the right hatch of the gear housing of the rear and middle axles there is a bolt puller 27, which serves to press out the reaction rod pin from 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 drive cylindrical gear of the front axle gearbox there is a threaded hole in which a plug 31 is screwed in for storage, used to close the hole in the clutch housing when fording.

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

At the base of the steering linkage arms, thrust bolts are screwed into the steering knuckle housings and welded, limiting the angles of rotation of the wheels.

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

On the journals of the axle shafts of the rear and middle axles, as well as on the journals of the hinge joints of the axle shafts of the front drive axle, heads 32 (Fig. 4) and 22 (see Fig. 1) are installed for supplying air to the wheel tires.

Tire taps 6 are installed on the outer ends of the axle flanges (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 bevel gear teeth and the correct contact pattern.

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