Among other details, UHF’s patent pending splitter-blade design allowed the blade loading to be fine-tuned in order to achieve its performance objectives. UHF is Xona Rotor’s most advanced wheel yet. Known as UHF (Ultra High Flow), its mission was to maximize flow capacity and raise efficiency. Xona Rotor’s second-generation turbine wheel has arrived. Xona Ultra High Flow Wheel Next-Generation Turbine Aero The oil also damps axial motions, a feature exclusive to Xona Rotor. Unlike some ball bearing turbochargers, Xona Rotor turbochargers also use the oil to hydraulically damp radial shaft motions that would otherwise compromise bearing life. This patented system is exclusive to Xona Rotor. It compensates for the variations in preload induced by thermal expansion and can vary preload as a function of rotational speed.
It harnesses the oil pressure delivered to the bearing housing to selectively apply preload to the rotating group as needed. Xona Rotor’s variable-preload system addresses the limitations of conventional bearing systems. In all other cases they are either employing insufficient or excessive preload. These conventional approaches to applying preload can only be optimized for a single design point. Compared to a press-fit preload system, a spring-based system can maintain a more consistent preload across a wider range of temperatures, but provides lower system stiffness. These temperature differentials will not allow optimum preload to be maintained for all operating conditions. Even in a water-cooled bearing housing, the temperature gradient between the outer and inner bearing races can be hundreds of degrees Fahrenheit.ĭue to the difference in operating temperature between the turbine and compressor, turbocharger applications also present a significant axial temperature gradient along the bearing’s length. The inner bearing race is typically pressed to the turbine shaft and runs hotter than the outer race, which is thermally decoupled and more directly bathed in cooling oil. However, the extreme temperature excursions inherent to a turbocharger present a challenging environment for a press fit-preloaded ball bearing. To maintain consistent preload, a press fit preload system relies on materials of equal coefficient of thermal expansion and uniform operating temperatures across the entire bearing system. The press fit method requires very tight axial tolerances to be held between the bearing’s inner races and opposing outer races. Typical methods to develop preload in a bearing are via a press fit or a spring force. Conventional Preload Techniques Have Limitations Xona Rotor’s variable-preload system extends bearing life by seamlessly introducing additional preload when needed and less when it isn’t. Compounding this situation is that the correct amount of preload is a moving target. Excessive preload also accelerates wear and generates heat. Insufficient preload can cause the unloaded row of balls to slide and skid on their respective races, generating fretting wear on the races that results in reduced life. To maintain contact of the unloaded row of balls to the races, a certain amount of preload is required. This thrust load is exerted on one row of balls in the bearing. The pressures acting on the turbine and compressor wheels are often unbalanced, which generates a variable thrust (axial) load through the turbine shaft. In a turbocharger, the correct bearing preload is a moving target. US9062595B2) to our ball bearing cartridge, we’ve achieved a best-of-all-worlds scenario. By integrating a proprietary variable preload feature (US patent no. Its M62 tool steel races and silicon nitride ceramic balls deliver the highest possible load capacity, and its metallic retainers won’t melt. We spared no expense in its specification, starting with a high-precision ABEC 7 angular contact dual-row ball bearing cartridge. Xona Rotor’s ball bearing system is unique.
Xona Variable Preload System Engineered for Life
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