Excavator & Dozer Bolt And Nut 16*2*90 Hex Track Roller Bolt

二,Overview of Excavator Track Bolts

2.1 Structure and Working Principle

2.1.1 Component Structure of Track Bolts

An excavator track bolt is composed of several key components, each playing a distinct and crucial role in ensuring the connection and stability of the track system.

The screw rod is the main body of the track bolt, usually with a cylindrical shape. It is threaded along its length, and these threads are the key elements for engaging with the nut. The diameter and length of the screw rod are designed according to the specific requirements of the excavator model and the load - bearing capacity needed. For example, in large - scale mining excavators that operate under extremely heavy loads, the screw rods of track bolts are often thicker and longer to withstand the large - scale pulling and shearing forces generated during the digging and transportation of ore. The material of the screw rod is typically high - strength steel, which can provide sufficient strength and toughness to resist deformation and breakage under various working conditions.

The nut is another essential part. It has internal threads that match the external threads of the screw rod. When the nut is tightened onto the screw rod, it creates a clamping force that holds the connected components together. Nuts used in excavator track bolts are often designed with a hexagonal shape, which allows for easy operation with common wrenches. In some high - performance excavators, self - locking nuts may be used. These self - locking nuts have special structures, such as nylon inserts or deformed threads, which can prevent the nut from loosening due to vibration and dynamic loads during the excavator's operation.

Washers are also an important part of the track bolt assembly. There are two main types of washers: flat washers and spring washers. Flat washers are placed between the nut and the surface of the connected component. Their function is to distribute the clamping force evenly over a larger area, preventing the surface of the component from being damaged by the concentrated force of the nut. In addition, flat washers can also help to fill any irregularities in the surface of the connected component, ensuring a more stable connection. Spring washers, on the other hand, are designed to provide an additional anti - loosening function. They are made of spring - like materials and have a split - ring shape. When the nut is tightened, the spring washer is compressed, generating a resilient force that helps to maintain the tightness of the nut - bolt connection. In the harsh working environment of excavators, where there is continuous vibration and impact, spring washers play a crucial role in preventing the track bolts from loosening.