At the just-concluded 2012 Shanghai Bauma exhibition , there was a trend that many of the steered axle tires of the imported construction vehicle chassis were using wide tires with a width of 385 mm, especially for concrete pump trucks. If several years ago, the domestic use of such a 385-wide tire vehicle chassis is absolutely considered as non-mainstream, but after the test of time, in recent years, 385 wide tires have gradually been accepted by people and become a trend.
The benefits of using an extra wide single tire are obvious. 385 wide tires than our common 315 tires in the size of the 70mm more, do not underestimate this 70mm, the front steering bridge to replace a pair of such tires, the area of ​​contact with the ground than ordinary 315 tires more than 140mm, the most obvious The advantage is that the stability of the vehicle is greatly improved.
At present, the flat ratio of the average 385 wide-tire vehicles is 65%, so some people may worry that low-flat tires will cause flat tires when they are driving in poor road conditions. Their reason is that the lower the flatness ratio, the thinner the tire wall. This worry is superfluous. Normal vacuum width 315 width tire size is generally 315/80R22.5, flatness ratio of 80%, then calculated to calculate the width of the ordinary 315 vacuum tire sidewall 252mm (tire width X flat ratio = sidewall width), and 385 The ultra-flat tire ratio of the 65R22.5 size is 250.25mm, which is only 2mm less than the normal tire above, and it is almost negligible.
In Europe, the steering bridge has used 385 wide tires for decades, but in the domestic market, no one manufacturer has installed such a wide tire on the original vehicle. In domestic terms, Xiao Bian also saw a heavy-duty HOWO truck that had been modified by a car owner to re-align the steering axle at a parking lot in Xinjiang last year.
Steering axle 385 wide tires are not very overloaded in Europe, but in the current domestic transport environment, 6X4 tractors are allowed to have a total weight of 55 tons. The load on the front axle is relatively high. If 385 tires are used, it is necessary. There are more things to reset, such as steering, booster pumps, braking systems, etc., so the 385-wide tire is still the most suitable for standard transport.
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