The origin of the demand for hub anti-off
The anti-off function of the wheel hub, in fact, is the anti-off ring of the tire, which is generally a special requirement in off-road conditions; of course, this can also be used on the road; but when driving on the road, because the tire pressure of the vehicle is relatively high High (cold tire pressure is generally above 2.2bar, and it will be higher after running), so this feature is generally not needed. In addition, non-off-proof can also simplify the structural design of the wheel hub, and the weight will be lighter, which can reduce the vehicle spring. This has very positive practical significance for improving the economy and handling of non-off-road vehicles that are already lightweight.
Usually the anti-off-off design is only applied in off-road activities; it can be said that whether the wheel hub is anti-off-off has become an important hardware standard for the off-road capability of the vehicle. In the past hundred years of rapid development of automobile technology, the improvement of hardware has become the guide for human driving skills and direction; just like the sequence box + electronic control filling oil technology, many people have been practicing hard for many years overnight. The heel-toe technique is eliminated, and leads a new way of technical style. The anti-off-off design of the wheel hub greatly improves the anti-off-off ability of the vehicle under low tire pressure, so that the off-road and off-road ability of the vehicle has been greatly improved.
The anti-off of the wheel hub is roughly divided into two types: ordinary anti-off and extreme anti-off. The corresponding combination of the product is the difference between the inner anti-off and the outer anti-off. Let’s talk about the characteristics of the two anti-off products. and pros and cons.
The characteristics of the inner anti-dropping ring; the above picture is a section view
-
Easy to install, saving time and effort;
The biggest advantage of the inner anti-loosening ring is that its installation method is exactly the same as that of ordinary wheels. It can be put into the bead of the tire. We know that the bead of the tire is very tight, so as long as it is stuck in place, the anti-falling ability of the tire can be greatly improved. The inner anti-loosening hub can be easily installed by using the normal tire installation method, and everything can be easily done without any other special means.
-
The tightness of the locking position of the inner anti-loosening hub;
Due to the design characteristics of the inner anti-loosening product, its anti-loosening ability comes from the card groove rather than other methods, so after the tire is installed, the wheel itself will not cause damage to the tire wall—whether it is normal tire pressure or low tire pressure It will not be under the condition of extremely low tire pressure; because this bayonet does not completely lock the tire wall, in the extreme case, it allows the tire and the wheel hub to slide relative to each other, but it will not easily cause the problem of detachment occur.
That is to say, the internal anti-loosening theory does not completely prevent the occurrence of lapping behavior, but as long as it is used properly, there is no problem at all even under extremely low tire pressure (below 0.5bar).
The scope of application of internal anti-loosening
The well-designed and well-manufactured inner anti-drop ring is enough to meet the needs of our daily vehicles, including off-road-crossing-desert-gobi-dry bed-swamp and other complex road conditions for civilian-level vehicles. Because the intensity and difficulty of civilian-level vehicle crossing will not exceed that of a much higher level off-road rally. In the off-road rally of the four-wheel drive group, whether it is the dakar of ASO, the FIA International Automobile Federation or the China Automobile and Motorcycle Federation of CAMF, most of the applications in these competitions are internal anti-off wheels, and the facts of the competition have also proved that In addition, as long as the product meets the technical requirements, the inner anti-off ring has no problem in dealing with these working conditions.
Both dakar and swr silk road champion peugeot buggy racing cars use internal anti-slip wheels.
The scene where the inner anti-loosening cannot be dealt with The inner anti-loosening ring does not have the ability to lock the tire wall 100% due to the structural characteristics of the problem (there is also a design that can be fixed with screws by drilling holes on the tire wall, such as the Spanish one. braid products; but we refer to standard products here); this makes it unsuitable for some special scenarios, such as rock climbing, which is always operated under extreme conditions, but in most cases, the internal protection is enough for us Daily use with no issues at all.
The characteristics of the outer anti-loosening: the tire is completely locked on the wheel hub by using the tire wall ring, and there will be no displacement or loosening under any circumstances; it is precisely for this reason that it is very time-consuming and laborious to install, without the use of electric tools You must have a unicorn arm if you want to install it, and because of this structure, its weight is usually relatively large.
Pay attention to the torque of the power tool when installing the outer anti-off hub; because its fixing screws are generally high-strength, most of them are 12.9-grade products, so be careful not to break the screws with excessive torque.
Application of external anti-shedding
The outer anti-dropping ring is generally used in special off-road environments, such as rock climbing and rainforest; however, rainforest vehicles generally require that the overall weight of the vehicle is relatively light, the power is not large, and the driving distance is also very short, so this requirement is still relatively small. Not too high, so the use of rock climbing is the most typical.
Due to the environmental problems that rock climbing needs to face, the size of the wheel hub is generally not large, but the diameter of the tire is very large, generally about 37-40 inches, which makes it have a very thick sidewall; thick sidewalls can When the air pressure is extremely low, a certain crown-hub clearance can still be guaranteed; making it less likely to be smashed by the hub during driving.
More importantly, this kind of thick tire wall can provide a huge ground contact area under low tire pressure. Whether it is an arc surface of a rock or a vertical surface of a cliff, it can provide a ground contact area far exceeding that under normal tire pressure. It endows the rock climbing vehicle with the ability to pass through seemingly impossible mountains and rocks, and in this ability, the outer anti-dropping ring hub has become indispensable.
Other applications for outer lock hubs: Rear-drive vehicles in off-road rallies
In the long-distance cross-country rally, there is only one type of racing car that uses the outer anti-off ring—that is, the rear-drive high-horsepower vehicles, typically such as buggy and trophy turck; their main feature is the rear-drive high-horsepower; and the power is not generally large, but It is very large, especially for trophy trucks, and the horsepower is usually more than seven or eight hundred horses. With such a large power, it’s okay to run on a hard road and get enough air. If it’s a soft terrain, such as the most typical desert, the violent action under low tire pressure can easily cause the tire to fall off, so it needs an external anti-slip ring to tighten the installation. Of course, the corresponding thing is that the sidewalls of the racing tires they are equipped with are particularly strong in tear resistance, torsion resistance and puncture resistance, with good support and very good torsion resistance. wall.
The use of the outer anti-off ring in daily life
In fact, in recent years, domestic refitted vehicles have used a large number of outer anti-slip rings; this is because the country is greatly influenced by American off-road culture, and the shape of the outer anti-slip ring looks wild, which will make many people like it. Various foreign refitted cars—especially the large number of American vehicles have also played a subtle role.
It is no problem to use the outer anti-off wheels under normal conditions, that is, under normal tire pressure, but generally speaking, most of these wheels are based on export products, so the width of most specifications is too large, and the general starting point is 8.5JJ is facing upwards, 9JJ is a common specification, and the tire width installed on these American rock climbing vehicles with at least 17-inch wheels is more than 12.5 inches, which is at least 305mm; too large wheel width will cause tires to wear unevenly And protruding sidewalls, this is a negative side, you need to pay more attention when modifying.
This kind of puncture is actually caused by the joint surface of the tire crown and the tire wall being heated and disengaged, thus “bursting”; driving with low tire pressure and heavy load can easily cause this situation, in fact, the tire wall is “ravaged”; borrow pictures from the Internet , please let me know and delete it if it is inappropriate.
But the more important point is that the wheel hub equipped with the outer anti-slip ring must pay attention to the condition of the tire wall when it is used at low pressure; because the completely locked tire wall is easy to be squeezed and rubbed at low tire pressure, causing cracks. If you do not pay attention to this situation, problems may occur when you return to the road at high speed, and the most typical problem is a flat tire; this flat tire is not a flat tire in the ordinary sense, but can easily become a whole The most serious situation is that the tire wall and crown are completely scattered, because the wall thickness of off-road tires is usually relatively large, and this situation is very easy to cause the vehicle to lose control.
Therefore, for vehicles equipped with an outer anti-off ring and used in a low tire pressure environment, more attention must be paid to avoid this problem.
Internal and external anti-shedding: which is better for everyday use
In fact, as long as you master the product features and points of attention we mentioned earlier, there is no problem with the daily use of the two types of wheels; however, when we refit, we should also pay more attention to the matching and coordination between the product style and model style, and the type of refitting use; For example, if you play rock climbing, it is a good match between style and performance if you use a Wrangler to change the outer guard. But if it is a model like Prado and you like to play in the desert, then the outer guard is not a good match in terms of style.
Another factor that cannot be ignored is that the cost of the outer anti-off ring will be relatively high because of its structural problems; in other words, the cost of an outer anti-off ring using the ordinary casting process can be made by using the spinning process The inner anti-dropping ring; the two will have a difference in compressive strength and toughness. For ordinary consumers, this is actually a point worth considering.
Of course, apart from the question of personal taste, “how I want to change my car is my freedom” is also the only truth; so under the premise of safety, everything is up to you.
Everything you say is right.
