Combined, these improvements deliver 10–16% improve- ment in isentropic efficiency in the targeted operating zones compared to its predecessor. The improvement also reduces the power required to drive the supercharger, resulting in ad- ditional fuel economy. TVS2’s integrated high-pressure seals can withstand


extreme pressure environments (up to 4 bar), and its bear- ing assembly enables temporary speeds up to 30,000 rpm. Speeds of this level enable an airflow range 25% higher than current offerings.


The higher speeds and increased boost pressures created noise, vibration and harshness (NVH) challenges. As a result, the TVS2 design includes a new backflow port that reduces noise without impacting air flow or efficiency. Micro-perforat- ed panel technology also enables targeted noise treatment, resulting in a decibel level improvement of up to 8 dB at low speeds. All of these key refinements to TVS2 provide system level benefits and efficiency optimization. Eaton superchargers for the North American market


are built to specifications using a proprietary manufactur- ing process at its Athens, GA, assembly facility. The facility focuses on three core manufacturing competencies—rotor machining, assembly, and end-of-line testing. Eaton’s part- ner companies—Advanced Technology Services, Bruckner Supply Company Inc., and The Tool & Gage House—are responsible for maintenance, indirect materials replenish- ment and metrology, respectively. Highly trained Eaton operators precisely machine and mill the TVS2 rotors, after which an abradable coating is


electrostatically applied and then heat-treated and bonded onto each rotor. The supercharger’s components—includ- ing the rotors, housings, gears, and shafts—are assembled in purpose-designed automation cells fitted with machine vision, servo-processes, and load-measuring technology.


“The process reduced casting procurement time to days versus the standard four-week timing.”


To ensure quality, each supercharger is tagged with a


bar-code so it can be traced to perform manufacturing trending analysis to ensure each unit is built in excess of standard automotive requirements. Once components are assembled, the timing of the rotors must be set. If any gear does not interact seamlessly with another, performance will be compromised. While a machine is used to set the timing, the loading of the machine and the post-timing evaluation are conducted by an Eaton techni- cian. A final performance and NVH test is conducted inside a sound-proof cabinet before shipping. Eaton has delivered eight million superchargers to the mar- ketplace since 1988. The company’s superchargers are in more than 70 OEM applications across multiple markets, including automotive, agricultural and personal watercraft.


Dan Ouwenga is engineering manager, Eaton Engine Air Management, Eaton Vehicle Group North America


Eaton TVS2 supercharger includes a new backflow port that reduces noise without impacting airflow or efficiency.


43 — Motorized Vehicle Manufacturing 2017


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