For UAZ vehicles different models and at different times, many variants of bridges were installed at the plant. Let's try to figure this out...
Bridge UAZ Timken (civilian or collective farm)
This is a split type bridge, that is, a bridge consisting of two halves. This type can also be attributed (it is also geared or portal). From the factory, civil bridges are installed on UAZ cars of the cargo range (loaf, onboard,), as well as on cars of the UAZ-3151 (469) passenger car series.
Gear ratios of UAZ military bridges
The gear ratio of military bridges is 5.38 (= 2.77 * 1.94 - the gear ratios of the main and final drives, respectively) - more high-torque, but less speedy than conventional bridges.
Characteristics of the military bridge
- Ground clearance: 300 mm (with tires Ya-192 215/90 R15 (31 x 8.5 R15)
- Track: 1445 mm
- Track gear axles UAZ Bars: 1600 mm
- Weight of UAZ military front axle: 140 kg
- UAZ military rear axle weight: 122 kg
Scheme of the gear (military) bridge UAZ
Rear axle UAZ with final drive:
1 – a cover of a crankcase of the main transfer; 2 - differential bearing; 3,13,49 - shims; 4 - sealing gasket; 5.7 - bearings of the drive gear; 6.15 - adjusting rings; 8.42 - cuffs; 9 - flange;
10 - nut; 11 - mud deflector; 12 - ring; 14 - spacer sleeve;
16 - main gear drive; 17 - satellite; 18 - right axle shaft; 19 – final drive housing; 20.29 - oil deflectors; 21 - axle bearing; 22,26,40 - retaining rings; 23 - sealing gasket of the final drive housing; 24 – final drive housing cover; 25 - bearing; 27 - brake shield; 28 - brake drum; 30 – a bolt of fastening of a wheel; 31 - trunnion; 32 - hub bearing; 33.41 - gaskets; 34 - lock washer; 35 - leading flange; 36 – a nut of bearings of a nave; 37 - lock washer; 38 - sleeve; 39 - driven shaft final drive; 43 - driven shaft bearing; 44 - driven gear final drive; 45 - special nut; 46.50 - drain plugs;
47 - final drive gear; 48 - right cup of the box of satellites; 51 - main gear housing; 52 – half shaft gear washer;
53 - half shaft gear; 54 - the axis of the satellites; 55 - driven gear of the main gear; 56 - left cup of the satellite box; 57 - left half shaft
UAZ front axle steering knuckle with final drive:
a - signal groove;
I - right rotary fist; II - left rotary fist; III - wheel disconnect clutch (option see Fig. 180, IV); 1 - stuffing box; 2 - ball bearing; 3 – the hinge of a rotary fist; 4 - gasket; 5 - press grease fitting; 6 - kingpin; 7 - overlay; 8 - body of the steering knuckle; 9 - kingpin bushing; 10 - bearing; 11 - driven shaft of the final drive; 12 - hub; 13 - leading flange; 14 - clutch; 15 – lock ball; 16 - protective cap; 17 - coupling bolt; 18 - trunnion; 19 - lock nut;
20.23 - support washers; 21 - final drive gear; 22 - locking pin; 24 - rubber sealing ring; 25 - thrust washer; 26 - axle housing; 27 – a bolt of restriction of turn; 28 - emphasis-limiter of rotation of the wheel; 29 - steering knuckle lever
Construction of a military bridge (photo)
Video replacement and adjustment of the main pair on the UAZ military bridge
Bridges Spicer UAZ Patriot and Hunter
Spicer is not a split, one-piece bridge.
In the early 90s, for the new UAZ-3160 car, the Ulyanovsk Automobile Plant developed Spicer-type drive axles with a one-piece crankcase.
The absence of a connector in the transverse plane of the bridge gives the structure high rigidity, the unloaded connection between the cover and the crankcase reduces the likelihood of leakage at the joint, and the placement of the main gear and differential in a single crankcase provides high engagement accuracy and more favorable conditions for the operation of the bearings.
- Width of bridges spicer for UAZ Patriot — 1600 mm
- Width of bridges Spicer for UAZ Hunter - 1445 mm
axle differential spicer
The device of the front axle UAZ 469 differs from the rear analogue in some design features. In addition to the bridge beam and differential, the assembly includes equal speeds corners and gearbox. The axle housing is connected to the ball joint with a flange. The hinge body is fixed by means of a pair of pins. The gearbox cover with pin and brake shield is bolted to the frame.
Description
To reduce the degree of wear of the assembly parts, it is recommended to turn off the UAZ 469 front axle when moving on a hard surface, the device of which will be discussed later. You should also deactivate the hubs on the front wheels. To do this, remove the caps and unscrew the bolts from the shaft socket. As a result, the coupling is installed in a position corresponding to the annular groove and the end face of the coupling. After installing this element in the required position, they begin to tighten the protective cap.
The activation of the front wheel is carried out by securely fixing the bolts. The bridge design scheme is focused on the synchronous switching on and off of the drive of both wheels.
The device of the front axle UAZ 469
The crankcase, main gear and differential correspond to the elements of the rear counterpart. In modification 469B, an oil flinger ring and a right-hand thread with the stamp "P" are provided. A ball joint is attached to the axle housing. It is fixed with five bolts. Bushings and pins are pressed into it. In addition, on the support there is a cover for the crankcase of the wheel reduction gear and a steering knuckle housing. A trunnion and a brake shield are attached to the locking element with six bolts.
The pivot appendage of the rotary cam is mounted with an interference fit, the value of which is adjustable from 0.02 to 0.10 mm. To prevent rotation of this element, locking pins are provided in the design. Adjustment of the position is made by means of gaskets installed in the upper part, between the fist lever. In addition, the position can be corrected by installing gaskets in the side and bottom of the part.
Peculiarities
The device of the front axle UAZ 469, the photo of which is presented above, suggests the presence of an oil seal, which is responsible for retaining lubricant in the housing and protecting the rotary cam from contamination. The element consists of an inner cage, a baffle, a felt pad and an outdoor unit. The gland is attached to the frame with bolts.
Protection against the flow of the lubricant mixture from the crankcase of the main gear to the rotary cam is provided by an internal self-clamping oil seal made of rubber in a metal cage. The lubrication of the upper pivot elements and the ball joint is carried out through special grease fittings. The lower elements are lubricated by a substance coming from the support by gravity.
Hinge
The device of the front axle UAZ 469 includes a hinged system for stabilizing the angular velocity. Its design guarantees the stability of the angular velocity of the driving and accompanying shaft. In this case, the distance and deviation between them do not play a role. The hinge itself consists of a pair of forks, in the curvilinear sockets of which four balls are placed. In the central compartments of these parts there is a fifth mounting ball that serves to center the forks.
The longitudinal movement of the hinge is prevented by a ball bearing and a safety washer. The leading inner fork interacts with the axle shaft of the differential gear. On the edge of the outer driven fork, the main gear of the wheel reduction gear and a roller-type bearing with a lock nut are mounted. The internal engagement of the element occurs by bolting. The driven part aggregates with a shaft on a roller bearing and a bronze bushing located in the middle of the trunnion. At the end of the shaft, a device is provided for deactivating the front wheels of the machine. It consists of a movable coupling, spring, balls and bolts. The outer protrusions of the part are connected to the internal slots of the flange, fixed with bolts on the hub.
Reducer device
469 gear unit is almost identical to the rear axle wheel gear. Among the differences between these elements is the way the drive gear is installed and fastened, as well as the design of the ball bearing placed in a special glass socket. The leading one is mounted on the slots of the driven articulated fork. It is fixed with the bearings by means of a special nut, which opens into the groove of the shaft after tightening.
The support washer is located between the roller bearing and the gear. These parts are not interchangeable with rear gear counterparts. Maintenance the same for both nodes.
UAZ 469 front axle device: connection diagram
The assembly and connection of the part in question is carried out in the following order:
- The sleeve is inserted into the knuckle trunnion by pressing. It should be flush with the end of the landing nest. Then the sleeve is rotated and adjusted with a special brooch to the required diameter.
- Limiting the movement of the hinge of identical angular longitudinal velocities is provided by washers installed in the trunnion and ball bearing. Their location should be directed with lubrication grooves towards the hinge. The fixing washer is fastened by punching in several places at points evenly distributed around the circumference.
- Replacing the pivot bushings involves pressing them and screwing them up to a diameter of 25 mm, with the possibility of passing through each bushing.
- When installing the hinge, grease is poured into the support.
- The device of the front axle on the UAZ 469 involves adjusting the necessary axial tensions with the help of control inserts, on which the location of the bushings and the ball joint itself depend. At least five spacers are used. The total thickness indicators at the top and bottom should not have a difference of more than 0.1 mm.
- Before assembling the stuffing box, the felt ring is impregnated with warm engine oil.
After assembling the front axle, it is checked on the stand in a static state and under load. This position is created by synchronous braking of the axle shafts. If the assembly is assembled correctly, there will be no increased noise of the assembly, oil leakage in the seals and cuffs, as well as at the junctions.
Maintenance
The device of the UAZ 469 front axle, the diagram of which is given above, provides for a number of preventive and adjustment operations during the operation period. Among them:
- Periodic tightening of threaded connections.
- Check pins for gaps.
- Bearing adjustment.
- Repair of gear clutches.
- Convergence check.
- Regular lubrication of moving parts according to the table of prescriptions for the use of lubricants.
A visual check of the UAZ 469 front axle device provides for an inspection of the steering knuckles for the integrity and suitability of the adjusting screws, restrictive rotary stops, as well as the reliability of the stopper of these elements.
The design scheme of the node under consideration is designed for a maximum angle of rotation of both wheels in the corresponding positions of the order of 27 degrees. An increase in this indicator indicates deformation of the hinged rotary cams, and this significantly complicates the repair.
Adjustment
The device of the front axle UAZ 469, the photo of which is given above, in the factory, involves adjusting the pivot with preload. In this case, the same number of corrective pads are installed in the upper and lower parts of the assembly.
The device of the UAZ 469 front axle kingpin differs in that special attention must be paid to the tightening mode of these elements. Fixation weakens as a result of gradual wear of rubbing parts. Axial gaps appear between the pivot ends and the support rings.
Repair
The front 469, the device of which is discussed above, may sometimes require repair. For repair, you will need to remove the part and disassemble it. This process is carried out as follows:
- Blocks are placed on the rear wheels of the car.
- Nuts and other block fastening systems are unscrewed.
- The rod is unhooked from the bipod, after which the nuts on the shock absorbers and the ball pin are removed.
- The fastening of the front springs with pads is dismantled.
- The front part of the car rises beyond the frame, after which the assembly is dismantled.
The front axle UAZ 469, the device described above, requires professional maintenance. But if you have the appropriate skills, you can manipulate this block on your own.
Front axle of UAZ-452
Device
The front drive axle is designed to transfer traction to the front steered wheels. The main gear and differential installed in the front axle are the same as those of the rear axle. The axis of the drive gear is shifted to the right of the longitudinal axis of the vehicle by 190 mm.
To transfer force to the wheels, constant velocity joints are installed at the outer ends of the axle shafts, which ensure the same rotation speeds of the driving and driven forks at any angle of rotation of the wheels.
The hinge is located inside the pivot pin, the design of which is shown in fig. 2.
Rice. 1. Hinge of equal angular velocities: 1 - driven fork; 2 - leading fork; 3 - central ball; 4 - leading balls; 5 - hinge assembly
The stub axle assembly, with the help of which the wheel is turned, consists of a ball joint bolted to the flange of the axle shaft housing, a stub axle housing connected to the ball joint by means of double pins, and a swivel pin. A brake shield is installed on the body of the pivot pin.
Rice. 2. Steering pin: 1- leading fork; 2 - ball bearing; 3 and 17 - adjusting shims of pivots; 4- king pin: 5 - steering trapezoid lever; 6 - body of the pivot pin; 7-1 driven fork; 8 - pivot pin; 9-wheel hub; 10 - leading flange of the hub; 11 - clutch; 12 - fixing ball; 13 - protective cap; 14 - bolt; 15 - splined end of the driven fork; 16 - kingpin pad; 18 - thrust washers of the hinge of equal angular velocities: 19 - casing of the axle shaft; 20 - stuffing box
Pivot bearings are assembled with a preload, which is adjusted by adjusting shims with a thickness of 0.1; 0.15 and 0.4 mm. Gaskets are installed at the top - between the ends of the steering trapezoid lever (on the left pivot pin) or lining (on the right) and the pivot pin body and below - between the ends of the lining and the pivot pin housing. The value of the preload in the bearings should be in the range of 0.02-0.10 mm.
During operation, due to wear of the rubbing surfaces of these parts, the preload in the bearings disappears and a gap is formed in them, which adversely affects the durability of the bearings, which is eliminated by adjustment.
To reduce wear of the front axle parts and save fuel during long-term operation of the vehicle on paved roads, it is recommended to turn off the front drive wheels.
For this purpose, a movable coupling is installed in the front axle on the splines of the driven fork, the outer splines of which are engaged with the splines of the leading flange of the front hub.
Rice. 3. Clutch position when turning on and off the front wheels
To disengage the wheels, the clutch must be disengaged from the drive flange.
To do this, it is necessary to remove the protective cap and, unscrewing the bolt from the driven fork, set the coupling to a position where the signal annular groove A on its surface is located in the same plane with the flange end. The bolt is kept from spontaneous rotation by a fixing ball and a spring. Turn on the wheels by screwing the bolt into the fork until it stops.
It must be remembered that the inclusion of the front axle with the wheels off is not allowed.
The front and rear axles have the same final drive and differential, so all instructions for adjusting the pinion bearings, backlash and contact in the final drive gears and rear axle differential bearings apply to the front axle as well.
Maintenance
Maintenance of the front axle consists in performing the same operations that are indicated for servicing the rear axle.
In addition, the following must be done.
At TO-1, lubricate the kingpins of the pivot pins through the grease fitting of the upper kingpin.
With TO-2, remove the front wheel hubs and, shaking the trunnion up and down, determine the presence of play in the pivot pins. If there is a gap, make adjustments. The adjustment procedure is listed at the end of the section.
Check the fastening of the steering trapezium levers to the pivot pins.
Check the maximum steering angles of the front wheels (minimum turning radii).
Through TO-2, perform all the operations indicated for TO-2, but instead of adding grease, rinse the hinges and put 300 g of fresh grease into them.
To replace the lubricant in the joints, unscrew the bolts securing the wheel trunnion to the body of the swivel pin, remove the brake and the trunnion (do not disconnect the hydraulic brake flexible hose), remove the hinge from the ball joint, remove the old grease, flush the hinge and ball joint and put 300 g of fresh grease. Reinstall the pivot yoke carefully so as not to damage the oil seal in the ball joint.
Front axle faults related to the operation of the final drive and differential gears will be the same as those of the rear axle and are listed in the "Rear axle faults" section.
Removal and disassembly of the front axle
For repair, it is necessary to remove the front drive axle from the car and disassemble it.
After disassembling and washing the parts, you need to check their condition (wear) and determine suitability for further work. Worn parts are replaced with new ones.
To remove the front axle from the car, you should:
- disconnect the pipelines of the hydraulic brake drive, shock absorbers, cardan shaft, steering arm, springs;
- roll back the front axle and install it on a stand or stands.
Disassembly of the front axle is performed in the following sequence.
Remove wheels and brake drums.
Remove the protective cap from the hub drive flange.
Unscrew the bolt from the driven fork and remove the sliding sleeve of the drive flange of the hub.
Unscrew the nuts of the studs securing the drive flange of the front wheel hub. Screw in the two bolts mounted on the flange and remove the flange from the splined end of the driven yoke.
Remove the front wheel hubs.
Remove the brake discs and stub axles and take out the constant velocity joints.
Remove the steering trapezoid arm and kingpin linings with shim sets.
Loosen the ball head nuts and remove the tie rod.
To disassemble the pivot pin, you must:
— to turn away bolts of fastening of an epiploon of a spherical support;
- press out the pivots and remove the stub axle housing;
- in case of wear of the stuffing box installed in the ball joint, you need to unscrew the bolts, remove the ball joint, press out the stuffing box and replace it with a new one.
Disassembly of the front axle housing, final drive pinion shaft and differential, as well as adjustment of the double tapered bearing of the final drive pinion shaft, differential bearings, adjustment of the backlash and contact in the engagement of the final drive gears must be carried out in accordance with the instructions made for these units in "Rear Axle" section.
The hinges of equal angular speeds are disassembled in the following order.
Mark with paint the relative position of the driven and driving forks.
Clamp the drive fork in a horizontal position.
Having turned the central ball with the flat towards one of the driving balls, move the driven fork to the side and remove the ball (passing by the flat).
Remove the other three balls in the same way.
Assemble the hinges in the following order.
Clamp the drive fork in a vertical position.
Install the center ball in the spherical recess of the drive fork with the flat to the side.
Place the driven fork on the center ball.
Turning the driven fork to the side, install the three drive balls into the grooves.
Open the forks to the maximum angle and, turning the central ball flat towards the fourth groove, insert the last (fourth) ball that will pass the flat of the central ball.
The preload in the hinge between the balls should be such that the moment required to rotate one fork from 10-15 ° in all directions from the axis with the other fork clamped in a vice is 300-500 kgcm.
To ensure correct assembly and obtain the required preload, the balls are sorted into 9 groups. Each hinge is assembled with balls of one group or with balls of two adjacent groups, for example, two balls of 25.41 mm and two of 25.44 mm.
When mounting, balls of the same size must be placed diametrically opposite to one another.
The difference in the diameters of two pairs of balls of one hinge is allowed no more than 0.04 mm.
If there is a stand, run the hinge on it at a varying angle from 0 to 30 ° for 2 minutes at a rotation speed of 300 rpm.
When running in, lubricate the joint with grease for pivot pins.
Front axle assembly
The front axle must be assembled in the reverse order of disassembly. All instructions for assembling the rear axle also apply to assembling the front axle. In addition to these guidelines, the following must be observed.
Press the bushing into the pivot pin flush with the end face of the socket under the thrust washer.
The oil grooves of the thrust washer mounted on the neck of the stub axle must face outward (toward the yoke flange).
The seating surface of the pivot pin must be lubricated with a thin layer of red lead, shellac or UN-25 sealing paste.
Lubricate the pivots with a liquid lubricant before assembling.
When installing the hinge, put the lubricant indicated in the lubrication chart into the ball joint and the hinge.
Lubricate the sliding sleeve of the drive flange of the hub when installing on the driven fork with a thin layer of grease 1-13 to protect against corrosion.
Lubricate the pivot bearings through the grease nipples with grease "C" or grease "C".
The oil slinger ring of the oil seal of the front axle drive gear, installed between the flange and the inner ring of the bearing, has grooves on the end face with the right turn direction and is marked with the letter "P".
The oil ring installed in the rear axle is left-hand grooved and unmarked. Oil stripping rings must not be interchanged, otherwise oil may leak from the stuffing box.
After completing the assembly of the front axle, it is necessary to check the angles of rotation of the trunnions in each direction and the setting of the toe-in.
The front axle after assembly is checked on the stand under load and without it.
A properly assembled front axle during operation should not have increased noise, heating and oil leakage through the stuffing box, covers and bolted connections.
The procedure for adjusting the pivot pin bearings is as follows.
Raise the front axle with a jack.
Loosen the wheel nuts and remove the wheel.
Loosen the bolts securing the ball joint seal and remove the seal.
Check for axial play at the pivots by moving the stub axle housing up and down by hand. If there is play, adjust, for which:
unscrew the fastening nuts and remove the lever to the bipod rod on the left pivot pin, and the kingpin pad (top) on the right pivot pin, remove the thin (0.1 mm) adjusting shim and install the removed parts in place.
Loosen the mounting bolts and remove the kingpin pad (bottom), remove the thin (0.1 mm) adjusting shim and install the kingpin pad in place.
To maintain the coaxiality of the cardan, gaskets of the same thickness should be removed from above and below.
Check build results. If the play is not eliminated, re-adjust by removing the thicker gasket (0.15 mm) and reinstalling the thin one (0.1 mm).
1 - axle housing;
2 - driven gear;
3 - drive gear;
4 - double roller bearing;
5 - cuff;
6 - mud deflector;
7 - flange;
8 - washer;
9 - nut;
10 - half shaft cuff;
11 - gasket;
12 - ball bearing;
13 - bolt;
14 - ball bearing seal;
15 - grease fitting;
16 - overlay;
17 - kingpin;
18 - thrust washer;
19 - hub;
20 - brake drum;
21 - cap;
22 - wheel off clutch;
23 - locknut;
24 - adjusting nut;
25 - lock washer;
26 - wheel bolt;
27 - hub bearings;
28 - remote ring;
29 - hub cuff;
30 - trunnion;
31 - gasket;
32 - hinge of equal angular velocities;
33 - ball;
34 - thrust washer;
35 - axle shaft;
36 - main gear housing;
37 - oil filler plug;
38 - bolt;
39 - gasket.
Steering knuckle with wheel gear
1 - cuff;
2 - gasket;
3 - ball bearing;
4 - upper kingpin;
5 - hinge of equal angular velocities;
6 - rotary fist;
7 - ball bearing;
8 - hinge shaft;
9 - drive gear;
10 - driven shaft;
11 - roller bearing of the driven shaft;
12 - cuff;
13 - roller bearings of the hub;
14 - hub;
15 - lock washer;
16 - adjusting nut;
17 - locknut;
18 - bolt;
19 - leading flange;
20 - clutch bolt;
21 - clutch;
22 - lock washer;
23 - retaining rings;
24 - trunnion;
25 - wheel;
26 - roller bearing of the drive gear;
27 - driven gear;
28 - oil drain plug;
29 - lower kingpin;
30 - rubber cuff;
31 - felt ring;
32 - cover;
33 - thrust washer;
34 - flange bolt.
Design Description
Two types of front axles are installed on cars - with a single final drive or with additional wheel reduction gears.
The axle with a single main gear consists of a cast-iron crankcase split in a vertical plane and steel tubular casings of the axle shafts pressed into it, additionally fixed by welding. The crankcase halves are bolted together through a gasket. The main gear with differential is located in the left half of the crankcase and forms the axle gearbox.
The drive pinion of the final drive is installed in the crankcase on double radial-contact roller and roller radial bearings located on both sides of its ring gear. The driven gear is bolted to the pinion box. Gears - bevel with a spiral tooth, gear ratio - 4.625.
The satellite box consists of two halves connected by bolts. It is mounted in the crankcase on two tapered roller bearings. The box contains two axles of satellites, four satellites and two side gears with thrust washers.
The adjustment of the bearings and the engagement of the gears of the final drive is carried out by changing the thickness of the spacers between the inner rings of the drive gear bearing and the number of washers at the inner rings of the satellite box bearings.
For a bridge without wheel reduction gears, a ball bearing with two holes, into which bronze bushings are pressed, is bolted to the flange of each of the axle shaft casings. The bushings include two pins pressed into the steering knuckle. A hollow trunnion is bolted to it, on which two identical tapered roller bearings of the wheel hub are mounted. Five bolts are pressed into the hub, to which a stamped steel wheel with a bore diameter of 15 or 16 inches is attached with flare nuts. The hub bearings are adjusted by nuts mounted on the threaded end of the trunnion.
Each axle shaft consists of a driving and driven parts connected by a Weiss ball joint of equal angular velocities. The hinge is located inside the ball joint and consists of two profiled fists, interlocking with each other by means of four balls placed in their grooves. The fifth (central) ball is located in the center of the hinge on the same axis as the pivots. The driven part of the axle shaft passes inside the trunnion and is connected to the hub drive flange through the splined wheel disconnect coupling. The flange is fastened with studs through the gasket to the end of the hub.
The front axle with wheel reduction gears is characterized by the fact that:
a gearbox with a spur internal gear and a gear ratio of 1.94 is attached to the body of the steering knuckle;
the main drive gear is cantilevered on two tapered roller bearings with a spacer sleeve between them;
the gear ratio of the main gear is reduced to 2.77, and, accordingly, the dimensions of the main gear housing are reduced.
The drive gear of the reducer is mounted on the splines of the driven part of the axle shaft.
Thanks to the use of wheel gears, the vehicle's ground clearance is increased by 80 mm, which increases its cross-country ability.
The main gear and wheel reduction gears are lubricated with gear oil poured into their crankcases. The final drive housing and wheel reduction gears have oil change holes closed with tapered thread plugs. Hub bearings, constant velocity joints and pivots are lubricated with grease.
To prevent leakage of oil and grease, as well as to protect against the penetration of dirt inside, the front axle is equipped with gaskets between fixed parts, cuffs in the hubs and on the pinion shaft, as well as combined felt-rubber seals sliding on the spherical surface of the ball bearings. In order to prevent oil from the gearboxes from penetrating into the cavity of the ball bearings, cuffs are installed on the axle shafts, and the ball bearing of the wheel gearbox has an oil deflector.
UAZ front pillar
If we consider the design of the UAZ 469 front axle from the point of view of the arrangement of the middle part of the bridge beam, differential and main gear, we can draw an analogy with the rear drive axle. The front axle differs primarily in the design features of the wheel control drive, which includes a gearbox and cardan joints of equal angular velocities (see Fig.). A flange is used to connect the axle housing (1) to the ball joint (3). The hinge body (5) is attached to the support using two pins (4). Gearbox cover (6) is bolted to this housing, on which pin (11) and brake shield (12) are mounted.
To reduce the wear of the axle elements and fuel consumption while driving on a hard road surface, it is recommended to turn off not only the UAZ front axle, but also the front wheel hubs. For this purpose, the protective caps are removed and the bolts are unscrewed from the shaft hole. As a result, the coupling is installed in such a position that the annular signal groove present on its surface is located in the same plane as the flange end. After the coupling is installed in the desired position, you can begin to tighten the protective cap.
The inclusion of the front wheel is carried out by securely tightening the bolts. The scheme of the bridge device provides for strictly simultaneous switching on and off for both wheels. In order to turn on the UAZ 469 bridge, you must first turn on both wheels without fail.
Repair of the front axle used on a UAZ 469 car requires knowledge of the wheel gear device, the scheme of which is similar to the rear axle wheel gear. The main difference lies in the mounting and fastening of the drive gear, as well as in the design features of the ball bearing installed in a special glass.
About maintenance
Repair and maintenance of the UAZ 469 front axle during operation requires, first of all, periodic checks and adjustments of the following parameters:
- threaded connections that need to be tightened from time to time;
- checking pivot joints for gaps;
- bearing regulation;
- gear clutch repair
- convergence check;
- compliance with the requirements of the lubricant table.
A visual check of the steering knuckles involves a thorough inspection of the assemblies for serviceability of the adjusting bolts, limit stops for turning the wheels, and checking the reliability of the locking of these elements. The scheme of the front axle device provides for the maximum angle of rotation of the left and right wheels in the respective directions, which is 28 ° for UAZ 469 and 27 ° for UAZ 469B. A larger value of this parameter causes damage to the knuckle joints, as a result of which the repair becomes much more complicated.
Front strut Patriot
At the factory, the knuckle pins are pre-tensioned. At the same time, the same number of special gaskets are installed from below and from above. During the operation of the bridge, special attention must be paid to the state of the tightening of the pivots. The tightening loosens as a result of wear of rubbing surfaces. Axial gaps appear between the support rings and the ends of the pivots, which must be eliminated by removing the same number of gaskets in the upper and lower parts. The total thickness of the gaskets at the top and bottom should be almost the same, the maximum allowable difference is 0.1 mm.
Unscheduled repair of the front axle may be required if the correct angles of the front wheels are not properly controlled. These angles largely determine not only the handling and stability of the car on the road, but also the degree of tire wear. In order to check the correctness of the angles, the machine is placed on a horizontal surface. The scheme of the leading front axle provides for the following wheel alignment angles:
- longitudinal slope of the pivots - 3 ° ± 30 ′;
- wheel camber - 1°30'±15'.
The values of the angles of the lateral slope of the kingpin:
- for UAZ 469 - 8 °;
- for UAZ 469B - 5°30′.
Wheel alignment is checked depending on how worn the rubber is. In order to adjust the toe-in, the machine is placed on a horizontal surface, the wheels are turned in the direction of forward movement. The convergence value, shown in the photo as the difference between distances A and B, can be from 1.5 to 3 mm. To check and adjust the horizontal toe-in, loosen the left and right-handed lock nuts, and then change the length of the tie rod.
Repair Features
Repair of the UAZ front suspension
Before performing work, it is necessary to remove the front axle from the machine and disassemble it. Repair includes washing parts, assessing their condition and suitability for subsequent operation. crankcase, differential and main gear are repaired similarly to the elements of the rear axle. In case of deformation of the casing of the axle shaft, the restoration is carried out only in a cold state.
The front axle UAZ 469 is dismantled in the following order.
- Blocks are installed under the rear wheels of the car.
- The tubes of the brake system mounted on the spars are disconnected from the flexible hose connected to the brake mechanisms of the wheels. Unscrew and remove the nuts with which the hoses are attached.
- Remove the nuts holding the lower parts of the shock absorbers.
- Unscrew the bolts with which the cardan shaft is connected to the drive gear flange.
- Disconnect the rod from the bipod and remove the nut on its ball pin.
- Unscrew the nuts securing the stepladders of the front springs, after which the lining, lining and stepladders are dismantled.
- The front part of the UAZ 469 is lifted by the frame.
If the axle is equipped with a spring suspension, steps 1-5 are performed, after which the anti-roll bar is disconnected from the trailing arms, and the transverse link and trailing arms from the corresponding brackets.
