Many riders have complained that their cars have been driving for more than 6 years, and they have begun to loosen and loosen various chassis. Run to the 4S or repair shop to check, basically the "swing arm bushing" is wasted. What to do? Change the bushing separately? Sorry, whether it is a 4S or a repair shop, it will basically not do this!
Today's car repairs are "mainly for changing parts", and the swing arm bushing is scrapped, and the entire swing arm is replaced. Needless to say, this is true everywhere in China. So some people thought: is not available on the Internet, those chassis modification companies launched the "reinforced bushings", known as a lifetime after changing?
Since this is the case, why don't I go straight to the modification line? Anyway, listen to the advertisement, after changing the "reinforced bushing", the car chassis will become very tight, instantly return to the state of the new car, and your chassis will never loosen again in this life... BALABALA, the question arises: are you sure this is not another IQ tax?
What exactly is the chassis bushing used for?
Why did it break the chassis and loosen it?
Today we will talk about whether this "reinforced bushing" is an IQ tax! First of all, the bushing is simply used to isolate the "cushioning parts" that exist in the "iron pod" of the car chassis components. In fact, the "machine foot" of the engine can also be understood as a kind of "thing similar to a bushing": a layer of rubber is cushioned between iron and iron, and the vibration is not isolated?
But the usual "healthy preservation period" of rubber is generally after 6 years of left (similar to tires, which has been repeatedly said in the past), after 6 years, the rubber enters a rapid aging period, and then becomes weaker and weaker, more and more fragile, and finally cracks, deforms, rots... So your engine is shaking, your chassis is loose, and all kinds of noises are coming...
Want to isolate the "hard impact", but also want to pursue long life, high stability (lifelong maintenance-free) characteristics... To be honest, both rubber and so-called hydraulic bushings are not good! Because as long as it is rubber, it will age. This is true of all the rubber under the sky.
Polyurethane reinforced bushings are out of the blue
Aging is extremely slow and can be changed for life
If you want to solve the problem, you must start directly from the material, such as - change the material! The so-called "reinforced bushings" in the modification industry are actually made of PU materials. PU - the code name of polyurethane elastomer, also known as TPU, also known as polyurethane rubber. Pu material is simply put, we can understand it as a material "between rubber and plastic".
It has the strength and durability of plastic, and at the same time has the flexibility and high elasticity of rubber. Therefore, in the Jiangsu and Zhejiang generation, some people will occasionally call PU "polyurethane soft plastic". However, the more widely known folk name is "cow tendon". For example, "beef tendon sole". Since rubber can be made into a bushing, the PU should obviously be able to do the same.
So there are really companies that have begun to try to use PU materials to make bushings. For example, The German Mercedes-Benz uses PU materials to make a "cushion" for the top of the shock absorption tower. Because the durability of PU materials is much better than that of rubber, for example, the wear resistance alone is more than 10 times higher than that of rubber. So the cushion made of PU can not be changed for life, because it ages too slowly and too slowly...
Although polyurethane is good, it is rarely used in the original factory
In addition to Mercedes-Benz and BAIC...
Another advantage is that PU also has a "special talent" that rubber does not have: variable stiffness. Simply put, it is "the harder it is pressed". Traditional rubber, on the other hand, is a typical "iso-stiffness" property, that is, the softness and hardness do not change with the change of pressure. So do you think the PU can actively react to the force and look "smart"? That's right, so the Mercedes-Benz tube "PU cushion" is called the smart adaptive shock absorber pad.
For example, some of BAIC's off-road vehicle series (such as ORV models such as BAIC Warrior) officially provide yellow PU reinforced bushings in the original factory; these bushings are used for the chassis. Basically, it can also be used "for a lifetime" to use the existence of the car scrapping. This is true even in continuous heavy off-roading.
Reinforced bushings are not suitable for family cars
The high hardness results in poor shock absorption
PU bushings are described by a popular advertising slogan as "PU is eternal, a perpetual". If it's so good, why is it almost impossible to see on the production car (except for the 2 "freaks" mentioned above)? - It's simple! Because compared with rubber, the hardness of PU materials is much harder.
This means that if you listen to the ads for those remodeled lines, put a PU bushing on your car... It is estimated that when you drive every day, your ass will make "solemn representations and strong condemnation" to you every day! After all, they do not have the technical strength of Mercedes-Benz, and there is no way to determine how to design the parameters of the PU bushing through accurate computer simulation.
So if you listen to the ads, get hot-headed and spend a lot of money, install the so-called "PU reinforced bushings"... Your car chassis is indeed "tight", but it is also "tight"! So don't think about the PU bushing, the original rubber bushing although there are a lot of problems, but it is better than comfortable! You're not a racing driver, what do you want?
TPEE material is the best bushing material
However, there is currently no manufacturer to use
Of course, if DuPont's thermoplastic polyester elastomer (TPEE) can be used in the production of bushings and cushions in the future, then "chassis looseness" will become history! Because the ADVANTAGES of the PU it has, and there are more than enough, and its hardness can be exactly the same as the rubber level, and it will never be as hard as the PU. And this product lives longer than PU!
"TPEE is eternal, a forever" advertising slogan must be so edited to taste! But for now, no company in the world has launched a TPEE material bushing. As for the reason, it is the same as "why don't you use stainless steel to build cars". If industrial products are really "durable and never rusty", then manufacturers are not far from bankruptcy?
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