English  |
9g-6744
CAT
9g-6744
Under the extreme conditions of mining and heavy construction, rotating systems must endure massive radial loads, dust ingress, shock impacts, and often inadequate lubrication. The Precision Bearing Sleeve acts as the critical "bridge" between the shaft and the housing. It serves not only as a key load-bearing wear component but also as a sacrificial protective layer that shields expensive main shafts and gearbox casings from wear.
Designed specifically for mining drill rigs and heavy construction machinery bearing systems, this product is manufactured from high-grade alloy steel using the forging process and precision machining. It features ultra-high dimensional accuracy, roundness, and wear resistance. As an essential spare part, it effectively reduces maintenance frequency and prolongs the service life of the whole bearing assembly.
High-Grade Alloy Steel: Unlike ordinary carbon steel or cast iron bushings, this product utilizes high-performance alloy steels . These materials contain alloying elements like Chromium (Cr), Molybdenum (Mo), and Manganese (Mn), offering excellent hardenability to ensure uniform hardness and microstructure even in thick cross-sections.
Integral Forging: The blank is formed via hot forging. Forging not only increases material density but, more importantly, breaks up the original cast dendritic structure, allowing metal flow lines to distribute continuously along the bushing contour. This fibrous structure provides exceptional shear resistance and impact toughness, preventing brittle fracture or deformation under heavy loads.
Ultra-Precise Dimensional Tolerance: Inner diameter, outer diameter, and width are processed via CNC precision turning and grinding. We strictly control dimensional tolerances to ensure the fit with the bearing outer ring or housing is a transition or interference fit, eliminating issues like loosening, outer ring spinning, or abnormal noise during operation.
Excellent Roundness & Cylindricity: Utilizing high-precision centerless grinding and internal grinding, the roundness error of the bushing is controlled to the micron level. Perfect geometry ensures uniform load distribution around the circumference, avoiding early fatigue failure caused by local stress concentration.
Surface Finish: While described as "Without Processing" surface, we typically provide a fine turning texture or phosphating treatment. This surface aids in retaining microscopic oil films, forming lubrication during startup to reduce dry friction, while the phosphate layer prevents rust during storage.
Ultimate Wear Resistance: After quenching and tempering, followed by high-frequency surface hardening, the working surface hardness reaches HRC 58-62. This high-hardness surface effectively resists abrasive wear and adhesive wear , significantly extending replacement intervals.
High-Load Rotational Support: Designed for slewing reducers and hoisting drums of mining drill rigs, it withstands massive radial forces and certain axial forces, ensuring minimal spindle runout during high-speed rotation and stable power transmission.
Protecting Core Value: As a "sacrificial part," the cost of the bushing is far lower than that of the main shaft or gearbox housing. Once worn, simply replacing the bushing restores precision, drastically reducing repair costs and downtime.
As an Essential Spare Part, this bushing is widely used in:
Mining Drill Rig Slew Bearings: Supporting the drill tower rotation, enduring massive overturning moments.
Crusher Main Shaft Sleeves: In jaw or cone crushers, supporting the eccentric shaft against violent shock and vibration.
Construction Machinery Transmission Supports: Locating sleeves in excavator swing reducers and dozer final drives.
Hydraulic Cylinder Guide Bushings: Supporting piston rods and preventing cylinder rod scoring caused by side loads.
Non-Destructive Testing : Every product undergoes ultrasonic or magnetic particle inspection before leaving the factory to ensure no internal cracks or inclusions.
Hardness Testing: Multi-point inspection of surface and core hardness to ensure compliance with heat treatment specifications.
CMM Measurement: Critical dimensions and geometric tolerances are spot-checked using a Coordinate Measuring Machine to ensure 100% interchangeability.
Interference Fit Installation: Due to high precision, installation usually requires liquid nitrogen shrinkage or thermal fitting. Direct forceful hammering is prohibited as it destroys roundness.
Lubrication Alignment: Ensure that oil holes in the bushing align with the housing oil passages during installation to guarantee smooth lubrication.
