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Stationary Gears are mated to the front and rear side housings and perform three major functions. First, the teeth intermesh with those of the rotor Internal Gear, to keep everything in sync. Second, the gears house the Main Bearings (not pictured here) which locate the eccentric shaft by its journals. And finally, they provide a means to deliver lubrication and cooling oil to the eccentric shaft and all the bearings/journals. Prior to 1993, the main bearings had one "window" through which the oil passed. Current versions have "Three-window" main bearings (and a special groove inside the stationary gear) for improved lubrication. Tooth load on the stationary gear is one of the limiting factors in allowable maximum RPM of a rotary engine. Stock gears begin to deform over 8,000 RPM, but hardened gears are available for higher RPM applications. |
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