14X-27-11710HUB

HUB is the core component that connects power transmission and support structure, playing a role of "connecting the upper and lower" - not only transmitting torque to drive equipment to travel, but also supporting the stable operation of rotating components. Its performance directly affects the power output efficiency and operational reliability of bulldozers. 1、 Basic Structure and Classification of Bulldozer Wheel Hubs The wheel hub of a bulldozer is not a single component, but can be divided into multiple types based on functional scenarios, with significant differences in structure and material depending on the application site Drive wheel hub Structure: As the core load-bearing component of the driving wheel, it is usually forged steel or high-strength cast steel (such as 42CrMo) formed as a whole, with a central keyway or bolt hole for rigid connection with the driving shaft (or final drive output shaft); Install holes evenly distributed around the periphery, and fix the driving gear teeth block (the component that meshes with the track chain rail) with bolts. Characteristics: It needs to withstand huge torque and impact loads, so the hub wall thickness is relatively large (usually 15-30mm), and it has been quenched and tempered (with a hardness of HB250-300), combining high strength and toughness. Supporting wheel hub Structure: Integrated with the supporting wheel body or connected through bearings, mostly made of ductile iron (QT500-7) or cast steel. The inner ring is matched with the supporting wheel shaft, and the outer ring is in contact with the wheel body (or bearing outer ring) to transmit the weight of the equipment to the track. Characteristics: It needs to have wear resistance and fatigue resistance. Some wheel hub outer surfaces will be quenched (hardness HRC45-55) to reduce friction loss with track chains. Guide wheel hub Structure: Located at the front end of the track, it is integrated with the guide wheel body or connected through a shaft sleeve. The central axis is fixed on the track frame, and the wheel hub rotates through bearings to assist in track tensioning and guidance. Characteristics: It mainly bears lateral forces and has a relatively simple structure, but it needs to ensure the accuracy of the fit with the shaft to avoid track deviation caused by excessive clearance.