We produce several types of drive axles suitable for installation on various SUVs, including UAZ. All types of bridges have a track from 1450 to 2200 mm, the displacement of the main pair body varies. All axles can be equipped with disc brakes, locking systems (self-locking and forced), and tire inflation systems. Technical characteristics of axles for all-terrain vehicles: - The bridges are designed for wheels up to 1450 mm with a total weight of the all-terrain vehicle up to 3000 kg. -Spaces for springs and shock absorber mountings are manufactured at the request of the customer. -Weight from 150kg to 190kg depending on the version -On axles with tractor final drives: -The diameter of the driven shaft of the final drive is 50mm. - Portal capacity 114 mm.
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Prices are for a pair of axles as standard:
1,2,6 articles with drum brakes
3,4,5,7 articles with transmission disc brakes
If desired, add additional options:
-Self-locking differential in the axle 15,000 pcs .
-Forced locking (pneumatic, mechanical, hydraulic) in the bridge 30,000 pcs .
-Swap 30000 (3,4,5,7 option)
-Disc brakes in a circle of 50,000 for 2 axles (articles 3,4,5,7)
-Swap 50000 (1,2,6 articles)
-Disc brakes all around 30,000 for 2 axles axle (1,2,6 articles)
GAZ 69
Mounts for UAZ 469, 3151, 3151 (Hunter), 3163 (Patriot), 3159 (Bars), 452, Gas 69:
- for spring suspension;
- for spring suspension.
* structurally possible to use only with R16 wheels with offset ET-0 (when installing wheels with a different offset, the wheels cling to the steering knuckle lever) * when installing portal axles instead of spacer axles, it is necessary to lengthen the driveshafts
Advantages of BMK portal bridges
- Reinforced hubs;
- Kingpin on cone bearings;
- Maintaining the vehicle track;
- Maintaining speed characteristics;
- Load balancing;
- Maintaining landing dimensions;
- Reducing the size of the differential housing;
- The flanges correspond to the connecting dimensions of the UAZ;
- The landing dimensions of the wheel rim correspond to the UAZ;
- Reinforced CV joints (drive) of the “beerfield” type with an increased angle of rotation;
- Wheel gear type - double-flow, silent;
- Maintainability. The components are interchangeable to the maximum with UAZ 469 military axles.
DIY gearbox repair
Repairing a final drive is a rather complicated procedure, but if you have certain skills, it can be done independently. First you need to remove the side gear housing itself.
Disassembly of the final drive must be done in a vice. To disassemble the final drive, you need to unscrew the bolts holding the locking plates. Next, you should inspect each bearing for its further operation. If a major overhaul is carried out, each bearing must be replaced.
When carrying out repairs, it is imperative to fill the final drives with new oil. All parts that have chips, cracks and gouges must be replaced. The gear axle shaft must be checked for integrity. If you plan to use it harshly, it is better to install reinforced shafts. The seals also need to be inspected and the faulty seal needs to be replaced.
The final drive must be assembled using a vice. All elements of the assembly are assembled and installed in the final drive housing. The differential is put in place, the bearing caps are screwed on. This completes the gearbox repair.
Pinzgauer
Unlike the previous suspension model, the portal axles from this Austrian all-terrain vehicle are not just borrowed technology from UNIMOG, but are Steyr's own development. Thus, our own technical solution for final drives equipped with external gears was provided.
Despite the fact that the use of such axles makes it possible to achieve a noticeably smaller increase in ground clearance, in this case there is much more efficient vehicle handling, especially if it is moving at a sufficiently high speed. The main reason in this case is that the Pints’ suspension is completely independent and is equipped with swing axle shafts.
VOiN4X4
Many, of course, know what portal axles are, which is why they visited our website, let us briefly remind ourselves - the portal axle, in addition to the central gearbox, has final drives that are located on its sides, through which the moment is transmitted directly to the wheels, as a result of which the more common name is final drives. gears are wheel reducers. If the wheel gearbox is made with external gears, it has a distance between the drive (drive) and driven (wheel hub) axle. That is, the wheel axis is shifted downward relative to the axis of the central part of the bridge, which gives a large increase in clearance along the bridges. Since a bridge with external gearboxes is U-shaped, it is customary to call this type of bridge U-shaped or portal, as it resembles a portal container crane (there are other versions). Wheel gears not only increase clearance, but also relieve the load on the transmission from the wheel side, allowing the installation of larger wheels without compromising the reliability of the transmission. At the same time, we must not forget that the central gearbox must correspond to the torque from the engine. Consumers do not always pay attention to technical subtleties, deluded that portal axles are a panacea for transmission breakdowns, forgetting or not knowing that many models of portal axles have speed restrictions associated with spur gears and inappropriate reduction ratios, and if you look at the power donor engines from which they were removed, it becomes clear why there are special kit kits to increase their reliability. It is for this reason that we have developed and are developing, according to individual requests, wheel reducers for standard SUV axles with the possibility of self-installation, as well as assembled portal axles. We can say that long practice has shown many nuances; we have unique experience, thanks to which we eliminate the risk of incorrectly choosing wheel gearboxes or portal axles. For our CDs, recommendations are indicated on the website, but if you have chosen another manufacturer, you can get advice from us whether they are suitable for your purposes or not
Topic on legalizing the installation of Portal bridges Registration of PM
We present to your attention a line of portal bridges that has no analogues on the market. The main difference and advantages of our portal axles is the presence of final drives in the form of external gear wheel drives. Thanks to the displacement of the driven axle, the clearance on the axles increases by 120-150mm, which significantly increases the vehicle's cross-country ability. This decision has long been appreciated by the military of almost all countries. The most famous SUVs on portal bridges are: Unimog - Germany, Volvo c303 - Sweden, Hummer H1 - USA, Pinzgauer - Austria, and a large use of this solution has been noticed on army equipment of other countries. In this area, domestic technology is inferior. Practically the only chassis with wheel gears is available in various armored personnel carriers, but their use on other vehicles is not always suitable for technical solutions. Thanks to our portal bridges, it is possible to build an all-terrain vehicle, significantly increasing competitiveness among analogues. There are models for both high-speed SUVs and wheeled all-terrain vehicles, including those with low-pressure tires.
Military bridges
In the vast majority of cases, we are talking about various devices that are used or are being removed from storage. In this case, the only advantage is the relative low cost of this option, because its cost is lower than branded equipment. It should be noted that foreign bridges are quite difficult to obtain today, and even if you managed to do this, their condition is unpredictable, and at the same time you do not receive any guarantee. Thus, there is both an advantage and a disadvantage, because when receiving foreign elements, all work is performed independently or with the help of specialists only at your own peril and risk.
What do they give?
If you decide to install portal bridges, you should expect approximately the following effect:
- maximum speed is reduced to 20%;
- acceleration dynamics deteriorate by approximately 40%;
- controllability is noticeably reduced;
- the geometric characteristics are improved by approximately 30% or 40%;
- the car receives higher traction characteristics.
In other words, it was not so important for the military to ensure high speed, because in the conditions of real combat operations, when in the vast majority of cases troops move across various rough terrain, it is much more important to ensure guaranteed arrival than to maintain speed, but risk getting stuck in some kind of situation. then a rut.
Thus, you will have to sacrifice some speed, but at the same time ensure more efficient vehicle maneuverability on any terrain.
Portal axles and wheel reducers
When transmission tuning reaches a dead end, i.e. I want even more ground clearance - and larger wheels begin with enviable regularity to fall apart the components of standard axles stuffed with the most lowered pairs, the most reliable locks, the most reinforced axle shafts and CV joints, then the light at the end of the tunnel is ideas for installing portal axles in the desire to increase your ground clearance immediately by 13 cm. There is no point in teaching athletes here - those who have grown to the TR-3/Proto class in trophies and portals have probably gone through their long, difficult path of compromise, trial and error, and they themselves know everything about portals and their features.
Don't forget about the competition, there is a week left - someone will get a block as a gift!
I will try to further mention the main options for choosing portals instead of standard axles for expeditionary/rotating/civilian vehicles, such as Toyota Land Cruiser 80/100/105, TLC Prado 78, Nissan Safari/Patrol, Isuzu Bighorn, Mitsubishi Pajero, Land Rover Defender and the like full-size SUVs. So there are options: 1. Portal axles Volvo C303 (aka paws and laplanders) 2. Tibus wheel gearboxes 3. Portal axles and wheel gearboxes Voin4x4 4. Homemade products 5. Unimog, Pinzgauer, AxelTech, Dynatrac, Marks 4WD Adapters, Toyota MegaCruiser, HardLevel, warriors, T-40, MTZ and more.
So, the general main advantages of portal axles and wheel drives: 1. Ground clearance is a plus! No increase in wheel size! 2. The wheel gearboxes themselves (both for conventional and portal axles) usually have some lowering and already this relieves the transmission from the hub to the engine - the load on the CV joints, axle shafts, differential, main pairs, cardan shafts is significantly reduced. 3. Properly installed, they allow you to hide the entire hub inside the discs with a plus offset, thereby protecting the calipers and brake discs from damage when in contact with the terrain.
A general overview of portal bridges can be read here ex-roadmedia.ru/oborudova…osty-i-bortovye-reduktory.
1. Volvo C303 portal axles (aka paws and laplanders)
This is a long-time choice of athletes in the trophy and the most popular portal solution at the moment. Pros: - wheel gears have a significant margin of safety - during installation you can cut everything off the stocking and weld standard shock absorber mounts and spring cups - easy transition to hydraulic steering - the ability to make a centralized pumping - the ability to remake it for any drilling, your own disc brake discs and calipers - sufficient prevalence that in an emergency some spare part can be borrowed from athletes in spare parts - the possibility of re-stocking the bridge with the gearbox shifted to the right, left, center, as well as shortening or lengthening the bridge by using axle shafts of a different length - other advantages will be added according to as comments are added
Disadvantages: - for heavy vehicles, the axle stocking is quite weak - reinforcement may be required - the need to rework the hubs to drill their own discs and remake them for disc brakes - weak axle gearbox with a main pair without a hypoid offset and a 2-satellite differential (tuning to a 4-satellite differential is possible) - the axle pins require close, regular attention - if the bolt is loosened, the pin can break off and remain immobilized - quite expensive original consumables (oil seals and boots), non-original ones do not differ in quality and reliability - at the moment the highest gear ratio is 5.9, which is, for example, for a light vehicle A 78th edition with 1kz or 5vz is too low even on 37 wheels. — it turns out that 5.0 pairs from Marius have been available for a long time. — other disadvantages will be added as comments are added.
Bridges are usually brought from Europe or Malaysia, where such equipment is/was in service with the army. Bridges themselves have long been in short supply, as demand for them is constantly growing and supply is limited. Used spare parts for bridges are also in short supply and quite expensive, since few people are willing to use their bridges for spare parts. Although even among the used bridges sold, there may be examples that are already in the metal receiving area.
At the moment, a set of original Volvo C303 axles with 7.1 pairs is available in Vladivostok and a few spare parts. In the near future, a couple more sets of such axles and many spare parts for Volvo C303 axles will arrive - the BLOKIROVKA.RU website has article numbers and descriptions of almost all consumables and components that may fail. To save significantly on such purchases, it is possible to supply bridges and spare parts to order - write in a personal message. It’s pointless to be indignant at pricing - if you want something cheaper, either go to Europe on your own and look for some grandfather-owner of a Volvo C303 and persuade him to part with it for cheap, or turn your attention to point 4.
If you search for bridges on your own on the Internet, you will inevitably come across advertisements for the sale of such bridges and their modifications from pinkerton666 (Andrey, Belarus) and grasshopper (Marius, Lithuania) - they have no equal here, I think more than 95% of Laplanders came to Russia through them. Several companies in Russia have tried to produce spare parts for Volvo C303 axles, including Honduras Motorsports, HardLevel and others. These bridges have been known in the world for a very long time, for example, at the oldest forum of off-road tuners in the USA they were discussed back in 2002, while in Russia the Internet was just beginning to come into homes at a maximum speed of 56 kbit/sec, and trophy competitions were still They were just acquiring technical regulations. In 2006, the Portal-Tek company began to exist, specializing in various modifications of Volvo C303 axles in the USA. In Russia, the boom of “laplanders” in civilian use, as far as I remember, occurred already in 2010-2012, before that they were exclusively on cutlets in TR-3 - correct me if I’m wrong.
In addition to those very “laplanders” that are so much talked about, a potential buyer may be faced with offers of “laplanders”, usually below the market price, which are no longer a cake. Namely: - bridges “wrung out” after sports - whatever may not be there - and worn-out fists beyond repair, and cracks, and bent stockings and repeatedly overcooked fastenings on the bridge, so that you can’t find a living place - restoration can be significantly more expensive purchasing normal bridges. - bridges “made” from something else - for example, from 6x6 axles and rear axles, homemade steering knuckles, re-stocked without the use of a conductor, and other collective farm stuff. - or they can, under the name “lap”, generally offer axles from the very real Volvo C202 Laplander, which are not even portal ones, or from the Volvo C404 - which are large, heavy and are not the object of your dreams.
This year 2021, only in the Primorsky Territory, 7-10 cars on “paws” can enter the RFC format competitions, and in the entire Far East, I think the total number of cars put on “paws” already exceeds 50.
2. Tibus wheel gearboxes
A good expensive ready-made solution for standard bridges - i.e. I screwed it on and drove off, you can read the details for example here www.drive2.ru/l/8054225/ and www.drive2.ru/l/8054442/ 
3. Portal axles and wheel reducers Voin4x4
Many years of efforts to develop wheel gearboxes in Barnaul have now led to the creation of some mass production, making it possible to manufacture portal axles from scratch in various variations for various tasks - i.e. for different vehicle weights, with different gear ratios in gearboxes, using any standard axles, etc. — in general, the developers promise to realize any of your wishes.
Actually, the site itself is filled with quite detailed descriptions and examples of work.
4. Homemade products
Here I would like to mention the unique experience in developing portal axles with the maximum use of standard Toyota components and a minimum number of home-made parts. The basis is taken from standard Prado 78 axles with a standard width, using original Toyota V6 8″ gearboxes, standard axle shafts, CV joints from the 185th Surf, original axles, hubs, bearings, brake discs, and original 4-piston calipers. Homemade double (from the top and bottom of the fist) steering bipods for hydraulic steering. The plans include installing chrome-molybdenum axle shafts with 30/30 splines and CV joints from the 215th Surf, modifying and strengthening the final drive housing, installing switchable standard locks converted to pneumatic activation and pairs in the gearboxes 3.53, which with a gear wheel gearbox of 1.4 will give a total gear ratio of about 5. The entire history of the appearance of these bridges is presented in photographs and comments and in the photo report of the chief designer of these bridges. Details about the introduction of these bridges on cars, I hope, will appear in the blog of this car in the spring.
I would also like to mention the bridges from Pipebender - everything seems to be very interesting, but again the UAZ main pairs along with the gearboxes are scary, and the saddest thing is that the stability of the production of these bridges is highly dependent on third parties who do not comply with the promised deadlines for completing orders for the production of components.
To those who want to “make” portals for themselves (even if they have friends at the right factories), we can only wish them good luck - the task is so labor-intensive and resource-intensive that there must be very compelling reasons to take this path.
5. Unimog, Pinzgauer, AxelTech, Dynatrac, Marks 4WD Adaptors, Toyota MegaCruiser, HardLevel, warriors, T-40, MTZ and more.
All this has not gained popularity due to many reasons - either bulkiness and weight, or low reliability, or enormous cost, or the lack of normal technology for the production of components and much more... UAZ warriors, of course, are significantly more popular than "paws", but they are only good which is for an almost stock UAZ.
The article does not pretend to be complete and objective, but here I would like to send people asking a simple question: “Which portals are best to install on my car?”
This article is on Drive2 https://www.drive2.ru/o/b/466245982686806377/
Can performance degradation be avoided?
Of course, there is a way to make a car bigger without compromising its performance. In this case, car tuning is carried out using final drives, which are installed on a standard transmission. Thus, there are two options for improving your own car.
The first option is relevant for those people who understand the equipment, do everything on their own, and can also select, find and subsequently adapt any used military axles from other vehicles to their own SUV.
The second option is for those who also understand equipment, but at the same time they have the opportunity to purchase and install specialized branded final drives.
Peculiarities
Such axles and final drives are used to increase ground clearance and also achieve increased cross-country ability. With the help of such mechanisms, you can not only raise the axles above the ground, but also get the opportunity to use larger diameter wheels, providing increased ground clearance.
It is also worth noting the fact that some designs provide unloading of the transmission in the event that large wheels are installed and overhang angles are increased. It is also important that increasing the ground clearance and all other manipulations allow you to gain an advantage in competitions where, in accordance with the rules, the diameter of the tires is limited. If we talk about ordinary off-road life, then when the wheel axle is located below the axle axle, it is much easier to exclude the possibility of the car landing in the process of slipping. Specialized tests showed that tuning cars by installing portal axles on them provided a significant increase in geometric cross-country ability while increasing traction characteristics.
What is this?
Portal bridges were originally developed by the military to allow their vehicles to travel over terrain that standard vehicles could not. In this regard, it was decided to place the axle axis above the wheel axis, while a specialized gearbox with gears appeared between them.
However, it must be understood that changes in the design features of the bridge structure also provoke changes in its running characteristics.
