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Line CardVM Linecard - Xona Rotor
Xona Rotor | Verocious Motorsports
Mission StatementXona Rotor was forged in 2015 from a long-standing relationship between performance industry leaders TiAL Sport and Forced Performance, with a mission to set the standard for motorsport turbochargers, delivering the highest-possible level of quality and performance. Variable-Preload Ball Bearing Cartridge SystemPerhaps Xona Rotor's greatest claim to fame is their Variable-Preload Ball Bearing Cartridge system. A unique system, they spared no expense in its specification, starting with a high-precision ABEC 7 angular contact dual-row ball bearing cartridge. Its M62 tool steel races and silicon nitride ceramic balls deliver the highest possible load capacity, and its metallic retainers won't melt. Also, by integrating a proprietary variable preload feature (US patent no. US9062595B2) to their ball bearing cartridge, they've achieved a best-of-all-worlds scenario. In a turbocharger, the correct bearing preload is a moving target. The pressures acting on the turbine and compressor wheels are often unbalanced, which generates a variable thrust (axial) load through the turbine shaft. This thrust load is exerted on one row of balls in the bearing. To maintain contact of the unloaded row of balls to the races, a certain amount of preload is required. 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. Excessive preload also accelerates wear and generates heat. Compounding this situation is that the correct amount of preload is a moving target. Xona Rotor's variable-preload system extends bearing life by seamlessly introducing additional preload when needed and less when it isn't. Xona Rotor's variable-preload system addresses the limitations of conventional bearing systems. It harnesses the oil pressure delivered to the bearing housing to selectively apply preload to the rotating group as needed. It compensates for the variations in preload induced by thermal expansion and can vary preload as a function of rotational speed. This patented system is 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. The oil also damps axial motions, a feature exclusive to Xona Rotor. Ultra High Flow Turbine WheelXona Rotor's second-generation turbine wheel, known as UHF (Ultra High Flow), serving to maximize flow capacity and raise efficiency. UHF is their most advanced wheel yet. 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. Turbine design is a multi-variable juggling act. One feature that heavily influences a turbine's mass flow swallowing capacity is the throat region located near the exit of the wheel. An effective method to increase the throat area is to decrease the number of blades. While reducing blade count tends to increase the turbine's flow capacity, efficiency typically suffers. Introducing splitter blades provides an elegant solution to the trade-off between flow and efficiency. The splitter blades alleviate the blockage in the throat area while preserving the fluid momentum at the wheel inlet. The result is that UHF has the swallowing capacity of a low blade-count turbine with the efficiency of a high blade-count configuration. Its improvements were observed analytically, validated experimentally on a gas stand and then confirmed in on-vehicle testing.
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