Brief Introduction To Track Roller

Brief introduction to excavator bottom roller / bulldozer undercarrier parts

Track Roller also called bottom roller, нижний ролик, which is an important undercarrier part of excavator / bulldozer/ Crawler. In terms of structure, the excavator bottom roller can be divided into unilateral roller and bilateral roller; The supporting wheels for excavator and bulldozer are generally black paint, and the supporting wheels for bulldozer are generally yellow paint. If the customer has special colors, they can also be customized.

The wheel body of the supporting wheel is generally made of 50Mn, 40Mn2 and other materials. The main process is casting or forging, machining, а потом термическая обработка. The hardness of the wheel surface after quenching shall reach hrc45 ~ 52 to increase the wear resistance of the wheel surface. The machining accuracy requirements of the supporting axle are relatively high. В общем, NC machine tools are required to meet the requirements.

The track roller for excavator is assembled from the wheel body, roller shaft, втулка вала, уплотнительное кольцо, end cover and other related parts.

Requirements for excavator bottom roller assembly:

1. All parts shall be strictly inspected and cleaned before assembly;

2. Before assembly of shaft sleeve and straight shaft, the mating surface shall be coated with a small amount of engine oil;

3 the floating oil seal ring shall be assembled in pairs, and its sealing surface shall be coated with grease; The contact surface between O-ring and floating oil seal ring shall not be coated with grease, and the O-ring assembly shall not be distorted;

4. The total installation force of floating oil seal ring is 450 ~ 500N; To ensure that the axial clearance of the assembled rear wheel body is 0.4 ~ 0.9mm, and the wheel body can be rotated by hand. The hand feels some resistance torque, but there is no jamming;

5 before filling the assembly oil chamber with oil, seal it with 0.4MPa air pressure at the screw plug, and put it into water for 1min without bubbles;

6 after assembly, run in shall be carried out, and then the wear debris shall be cleaned, and the impurity mass in the cavity shall not exceed 0.12g;

7. The floating seal ring shall be free from defects such as pores and scratches.