Type of specification for car rim
There are two main types of rims: deep rims and flat rims; in addition, there are split rims, semi-deep rims, deep groove rims, flat bottom wide rims, and full slant rims.
Deep groove rim
The rim is integral and has a deep groove in the middle of the section, which is mainly used for cars and light off-road vehicles. It has a shoulder flange to hold the bead of the tire, the shoulder of which is usually inclined slightly to the middle, and the inclination angle is generally 5 degrees of soil. The maximum diameter of the inclined portion is called the diameter of the tire bead and the rim. The middle part of the section is made into a deep groove to facilitate the disassembly and assembly of the tire. The deep groove rim has a simple structure, a large rigidity, and a small mass, and is most suitable for a small-sized elastic tire. However, larger and harder tires are difficult to fit into such an overall rim.
This type of rim has many structural forms. Figure 20-18b shows a form commonly used in trucks in China. The retaining ring l is integral, and an open elastic locking ring 2 is used to prevent the retaining ring from coming out. When installing the tire, first place the tire on the rim, then put the retaining ring and push it inward until it passes over the annular groove on the rim, and then insert the elastic locking ring of the opening into the annular groove. Both the Dongfeng EQl090E and the liberation of the CAl091 type of vehicle wheels use this type of rim.
The rim is composed of two parts, inner and outer, and the inner and outer rims may have the same width or may be unequal, and the two are bolted together. When disassembling the tire, remove the nut. The retaining ring 3 is detachable. Some have no retaining ring, and the inner rim and the web are welded together by the integral rim of the inner rim instead of the retaining ring. Dongfeng EQ2080 and Yan'an SX2150: car wheels, which use this type of rim.
Since the rim is the basis for the assembly and fixing of the tire, when the tire is loaded with different rims, the position and size of the deformation also change. Therefore, it is best to use the specified standard rim for each type of tire, and if necessary, the rim (allowing rim) with the same size as the standard tire. If the rim is not properly selected, it will cause early damage to the tire, especially when used on a narrow rim.
In recent years, in order to adapt to the need to improve the tire load capacity, the car began to adopt a wide rim. Tests have shown that the use of a wide rim can improve the service life of the tire and improve the passability and driving stability of the car.