We won’t introduce the origin of the Unimog car. Simply put, it was a product when Germany faced many problems after World War II. Its birth is not magical, but it just exists in an era that cannot be helped; today Its development has indeed been very strong. The products of Baiseries (U400 series) and Qianseries (U4000 series) are involved in various fields, and even include versions for armored vehicles, which fully demonstrates its powerful products and wide range of applications. widely.
Unimog Unimog has been used from civilian to military, and even the French Caesar self-propelled artillery system has used it; similar systems in my direction are also equipped with Xiaolongmen bridge vehicles.
Features and advantages of Unimog Unimog:
Unimog’s most proud product features are nothing more than two, namely the flexible frame and the portal bridge system; as for other equipment, such as the whole body PTO, any model of the same size can also be modified, so it is not considered Its own characteristics are not counted.
The biggest function of Unimog’s flexible frame is that its girder can have the ability to torsion. This is completely different from other models that emphasize rigidity. It is this feature that makes it exceptional in dealing with extremely rugged environments. Because of the torsion of the girder, the design of the bridge system and the large stroke, the passability of the Unimog becomes very strong; but it is precisely its extreme design that makes the Unimog’s The load-carrying capacity is not as good as that of ordinary structure models; so its advantages are obvious, and its disadvantages are also obvious.
Another feature of Unimog is its door-bridge structure. Everyone is familiar with the characteristics of the door-bridge, so we don’t need to repeat it; the passing capacity of vehicles.
Weaknesses of Unimog:
The power system is weak; take the more widely used Qian series as an example: the most obvious problem of the Qian series is that its power compartment space is small, so the power pack that can be accommodated is not large enough; take the Mercedes-Benz OM924LA diesel engine installed as an example, the 5 liter The engine power of the displacement level is only 160kw, and the maximum torque is 810nmp0rpm, which is a very typical low-speed diesel engine; the biggest problem with this kind of power is that it cannot achieve fast response in certain terrains, the most typical example is in the desert, Or on the hard-shelled roads on the Gobi Desert, it is very dangerous to pass without the ability to react quickly.
In this kind of terrain, the OM924LA diesel engine has no enough torque, and no horsepower means that its speed performance is not good enough. In many terrains, no speed and close torque can not solve the problem; otherwise, in practical applications Whether it is military or civilian use, there are not so many high-powered light-duty vehicle products—we only need a tractor to go off-road.
The Dingo armored vehicle modified by the Unimog Unimog platform is equipped with the National Defense Forces in Afghanistan.
Problems with gate bridge structure:
We all know the biggest advantage of the portal bridge, that is, it can bring a high ground clearance to the vehicle and greatly improve the passability of the vehicle, especially when equipped with large wheels (such as 12.00 14.00-20, thousand series Generally at this level), its passing performance can be compared to that of tanks, which allows it to pass through with the overall advancement of military operations without the need for logistical maintenance roads, which is very important for improving the efficiency of operations Very important; in civil applications, high passing capacity also has a very positive meaning for firefighting-forest fire-rescue and rescue, etc.
After talking nicely, let’s talk about the problem of Menqiao; compared with the advantages of Menqiao, its disadvantages are basically the same. The reason why Menqiao can leave us such a good impression is because those users It doesn’t care about the cost. If you care about the cost, then its shortcomings are enough to see.
First of all, the structure of the portal bridge is complex; there is no doubt that adding a first-stage reduction mechanism to the final drive system will definitely complicate its structure, and both Unimog and Hummer H1 face the same problem; Then there is the high cost, needless to say, high is high, there is nothing to argue about. Then there is the low load capacity, which is directly caused by the structural characteristics of the gate bridge. It is impossible to compare the load capacity with ordinary axles, but the off-road truck itself does not have high requirements for heavy loads. This seems to be for gate bridges. Continued life.
The next step is the obvious resonance of the portal bridge. The special structure of the portal bridge, its higher center of gravity and the problem of non-concentricity of the axles make the noise of the overall transmission system loud after it runs; this is also the structural feature of the portal bridge. No matter how it is designed or processed, it is impossible to achieve the same as that of ordinary axles. At best, the gap is getting smaller and smaller—compared with planetary terminal deceleration, the noise is also high.
Unimog Unimog is an octogenarian model, and its structural features have not changed much, and it is these structural features that make it special, allowing it to monopolize a very special and profitable for a long time This is its strength, but decades have passed, and now it is possible to see whether the automotive products around the world can achieve Unimog and Unimog, which have such structural advantages but are simple in design and low in cost. ?
The answer is very positive and clear, that is: yes!
movag Movag company’s flagship product
Excellent design; the duro series from Movag Switzerland
Does Movag’s name sound familiar? Friends who like military must sound familiar, because Movag is the manufacturer of the famous piranha armored vehicle. The most famous product is the LAV-25 wheeled combat vehicle; this product is sold all over the world from Europe to North America. , even the fourth-class Ma Rui has to use their products to show off.
The duro has excellent ground clearance, travel and stability.
The corresponding products of Movag and Unimog are its duro series trucks; when it comes to the design of duro, one cannot but praise the genius industrial design; it uses the simplest idea to achieve the effect of the gate bridge, The manufacturing cost, process complexity, maintenance convenience and long-term usage rate are far lower than Unimog;
Duro’s axle design is actually an innovative separation of the traditional hard axle into two parts: the bridge tube and the tooth bracket; the bridge tube only bears load and connects the axle, and does not have any transmission parts, which makes it the most difficult to design, process and build. The part becomes the simplest product; then it is freely combined with a separate tooth kit and half shaft, and the bridge structure can be easily added; in addition, duro also designed the brake system as a central placement structure.
Compared with Unimog’s complex, expensive, bulky and difficult-to-maintain portal-axle system, duro’s axle achieves the same effect by using only a single steel pipe + independent tooth-packed half shaft. From the product picture It can be seen that its cost is much lower than that of the gate bridge; and it is extremely convenient in terms of maintenance.
In terms of suspension travel, duro does not need to rely on complicated flexible frames, but only needs to use the axis of the frame-type axle positioning mechanism in the vertical direction to complete the large-stroke movement. All designs are extremely simple, but efficient And the cost is extremely low.
In addition, duro takes advantage of the elevation angle of the axle and bridge tubes to achieve a ground clearance similar to that of a portal bridge, but it can place the axle tube shaft in the center of the hub, thereby greatly increasing its load capacity and driving stability. From the perspective of structural characteristics It can be said that these are things that Unimog’s door bridge cannot do.
So when we compare Unimog and duro, we can easily find out who has more product and technical advantages. As for who has a better application, it cannot be solved by the product itself; there are many good designs in the world. , but not every good design can be seen by us, let alone turned into a product; but at least we can know what is better, and knowing more about “better” is also a wonderful thing .