14X-27-11751COLLAR
In the transmission, walking, and working device system of bulldozers, a shaft collar is an annular positioning part that is fitted onto shaft components. It is mainly used to limit the axial displacement of other parts on the shaft (such as gears, bearings, and hubs), ensuring that each component works stably in the preset position. Although the structure is simple, it plays an irreplaceable role in equipment assembly accuracy, operational stability, and component protection. 1、 Basic Structure and Classification of Collars Structural features: Collar is usually a ring-shaped metal component, with a precision fit between the inner hole and the shaft diameter. The outer diameter is slightly larger than the shaft diameter, and the width is designed according to the force requirements (usually 1/3-1/2 of the shaft diameter). Part of the collar has threaded holes (for installing fastening screws) or key slots (connected to the shaft through flat keys) to enhance the fixing strength with the shaft; The surface is often treated with rust prevention (such as galvanizing, blackening) to prevent rusting in humid environments. Main categories: Fixed collar: a structure integrated with the shaft (formed by forging or welding), commonly used in key shaft components such as transmission shafts and drive axles, with high positioning accuracy, suitable for scenarios that withstand large axial forces. Detachable collar: an assembled component independent of the shaft, divided into: Tightening screw collar: Fixed by pressing 1-2 tightening screws (with pointed or flat ends) against the surface of the shaft, the structure is simple and easy to disassemble, but the positioning strength is low, suitable for light load or temporary positioning (such as auxiliary limit of guide wheel axle). Clamping type collar: It is composed of two half rings connected by bolts, with the inner hole and shaft interference fit. After clamping, it generates radial force for fixation, without stress concentration (compared to tightening screws). It is suitable for medium load scenarios (such as bearing positioning of supporting axles).
product key technologies
2. Walking system: Detachable collars on the drive wheel axle, support wheel axle, and guide wheel axle are used to locate the inner ring of the bearing. The material is 45 # steel (quenched and tempered), and some heavy-duty models use 40Cr alloy steel (hardness HB220-250).
3. Working device: The shaft rings on the blade hinge shaft and the soil loosening arm shaft are mostly clamping type, used in conjunction with joint bearings to prevent axial movement of the bearings during soil pushing operations. The material is cast steel (ZG35), which balances strength and toughness.
2. The inner hole surface of the detachable collar should be smooth (with a roughness of Ra1.6 μ m or less) to prevent scratching the shaft surface during installation; The bolts of the clamping collar should use high-strength bolts (grade 8.8 or above) to ensure stable clamping force.
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