轮体圆径的减小 变成轮子线速度加快，轴套承受的摩擦越多。支轴变细道理也是一样，同样承受撞击的力度也会不够，照成轴变形或者断掉。 铜套起到摩擦作用，铜层必须经过滚扎后才不易脱落，正常得0.35mm以上铜层才达标，减少铜套长度支重轮的意义也就失去了作用，减少长度等同于减少受力面积。
Supporting wheel is one of the four wheels of crawler construction machinery chassis. Its main function is to support the weight of excavators and bulldozers, so that the crawler moves along the wheels.
Wheel body, supporting wheel shaft, shaft sleeve, seal ring, end cover and other related parts.The supporting wheel can be divided into unilateral supporting wheel and bilateral supporting wheel.Supporting wheel for excavator and bulldozer, the supporting wheel for excavator is generally black paint, and the supporting wheel for bulldozer is generally yellow paint
Supporting wheel body material is generally 50Mn, 40Mn2, and other materials, the main process of casting or forging, mechanical processing, and then heat treatment, the hardness of the wheel surface after quenching to HRC45~52, in order to increase the wear resistance of the wheel surface.The machining precision of the supporting wheel shaft is required to be relatively high. Generally, it is necessary to use CNC machine tools for machining to meet the requirements.There are many materials with 40Mn2, and after processing, they need to undergo quenching and heat treatment, and their hardness reaches about HRC42
There is a problem
A. wheel body wear.The reason for this situation is the use of unqualified steel or material heat treatment of low hardness, wear resistance;
B. oil leakage.The supporting wheel shaft is always rotating through the shaft sleeve, and the wheel body needs to be lubricated with oil. However, if the sealing ring is not good, oil leakage is likely to occur. In this way, the shaft and shaft sleeve are easily worn without lubrication, which makes the product unable to be used.
There are several reasons for oil leakage :1 floating oil seal unqualified 2. The product shaft sleeve roundness is not enough 3. Support shaft gloss is not enough 4.
The problem of supporting wheel produced by domestic manufacturers
1. Many steel labels are not up to standard, and the heat treatment process is not well developed.
2. Due to the vicious competition in the market, corners are cut in several important structures of the product, such as the reduction of the round diameter of the wheel body, the thinning of the branch shaft, and the shortening of the length of the copper sleeve.
As the diameter of wheel body decreases, the linear speed of wheel increases, and the bearing sleeve bears more friction.It is the same with the thinning of the supporting shaft. The force of impact will be insufficient, and the shaft will be deformed or broken.The copper layer is not easy to fall off until it has been rolled. The copper layer above 0.35mm is normal before reaching the standard. The significance of reducing the length of the copper sleeve and supporting wheel is also lost.
Therefore, the advantages of domestic products over foreign products are very great.