While natively integrating most calculation norms including the latest updates of the ISO 6336-2:2006 for gear calculation and the TS 16281:2008 for bearing calculation, English company Romax goes further and works with the most respected experts around the world to develop their own additional algorithms.
Functions now available in Romax Enduro enable increasing design reliability and estimating very precisely the life of a complete gearbox, taking all aspects of real-life conditions into account. Using Romax, we can now estimate the life of each gearbox in our customers application, component by component, taking into account the impact on a component on the other, and, more importantly, considering your output element as a part or the system.
The following phenomenon is typical: in a rack and pinion transmission, the combined loads generated by the helical pinion are applied to the output shaft, they bend it, tilt it around the output bearings, twist the planet carrier, which compresses the ring gear onto the gears, the needles against the planets, the planets against the sun gear and finally applies a radial load on the customer motor shaft! As a result the sun gear suffers more than what the basic norms can estimate (basic algorithms will only give L10h results) and becomes the weak element in the system. Romax Enduro can tell us the damage to each of these elements!
The result of such calculation is obviously conservative when compared with standard datasheet ratings: in such or such application or working conditions, the same gearbox can be rated a certain torque value or only half of this value! Shafts, bearings, planet carriers, gears, needles, axles etc. all have their own stiffness. Who would prefer trusting catalog values that do not consider such a phenomenon?
Using Romax Enduro consequently makes our recommendations precise and professional: we now can tell you the difference in any internal element lifetime if you use a 25 teeth pinion rather than a 20 teeth pinion, as the resulting additional shaft torsion, flexion and tilt will reduce the size of the zone where the planets are transferred power from the sun gear, or transfer this power to the ring gear (this factor called the Khβ is clearly displayed in the results). Our engineers can show you that a 160 Nm gearbox is only a 120 Nm gearbox if you install a spiral bevel gear on its output shaft, because the radial and axial load generated by the bevel gear set will compress and deform the output bearings and tilt all the components inside above this torque. We can tell you that adding 2 teeth to your pinion and increasing the ratio slightly can sometimes increase, sometimes decrease the overall life, depending on the initial ratio.
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