Ever-Power new planetary reducers hire a floating sun gear rather than a set position one.
The saying ”There’s nothing new under the sun’ certainly applies to planetary reducers. And, while floating sun gears have already been around a long time, some engineers may not become aware of the benefits this unusual gear style can offer.
Traditionally, planetary reducers possess used a set sun gear, where in fact the centre gear is attached to or machined into the shaft. When this set sun equipment revolves, it turns the earth gears to create motion and/or power. Ever-Power new planetary reducers, however, are having a floating sun gear rather than a set position sun gear.
Why a floating sun gear? ‘In the planetary idea, the sun is the driver, or pinion, in the apparatus set,’Ever-Power design engineer Scott Hulstein said. ‘Because the sun gear is in constant contact with the planets, it’s important that it is properly centred among the three planets in order to provide equal load posting among itself and all three planets.’
Due to normal manufacturing tolerances nevertheless, a sun gear which is securely fixed on a shaft will intermittently have more load using one planet gear than on another equipment Hulstein explained. ‘By permitting the sun gear to float, it centres itself among the three planets and produces continuous, equal load sharing.’
Equal load sharing is just one of the advantages of this design. The floating sunlight gear provides ‘true involute action,’ according to Hulstein. True involute action takes place when the rolling motion between your mating gears is as complete as possible. The benefit of this total meshing of gears is longer reducer life, since less internal equipment slippage means fewer broken gear teeth.
That also means lower noise levels. When sunlight gear is permitted to completely roll in to the planet gears, there’s much less ‘rattling’ as one’s teeth mesh. In place, the Ever-Power product has ‘designed out’ the gear mesh noise by allowing sunlight equipment to float into place.
So why use a fixed sun gear at all? ‘Fixed sun gears tend to be used in true servo applications,’ Greg Pennings, Ever-Power Client Advocate, explained. ‘A set sun gear is necessary when exact positioning and low backlash are an intrinsic part of the software.’ Ever-Power engineers, nevertheless, were less worried about low backlash and more interested with higher torque and/or lower sound applications.
Our planetary reducers with floating sunlight gears were designed to compete with parallel shaft reducers, where backlash was less critical,’ Pennings said.
By using the floating sun gear concept, the Ever-Power planetary reducers can exceed the torque ratings of similar sized and bigger sized parallel shaft reducers, yet maintain a lesser noise levels.
Sun, Ring and Planet
The most basic kind of planetary gearset is shown in the figures above. The figure at left shows a three-dimensional view as the figure at correct offers a cross-section. In this geartrain, inputs and result can be taken from the carrier, band and sunlight gears, and only the planet experiences epicyclic motion. That is the the majority of common type of planetary gearset (apart from the differential) and it finds application in speed reducers and automated transmissions. If you take aside a cordless drill, you’ll probably find this type of planetary gearset directly behind the drill chuck.
Two Suns – Two Planets gearset
Cross-sectional view
Two Suns, Two Planets
The gearset demonstrated above has two sunlight gears, and both planet gears (the yellow gears) rotate as an individual unit. Sunlight gears (green and brown) can rotate independently of 1 another. The inputs and output can be selected from either sun equipment and/or the carrier. Very high speed reductions may be accomplished with this unit, nonetheless it can sun planet gear suffer from low efficiency if not really designed correctly.
Red sun input – purple sun fixed
Purple sun input – reddish colored sun fixed
The animations above show the ‘two suns – two planets’ gearset with one sunlight as input and the other sun fixed. Note that the carrier rotates clockwise in the computer animation at left and counterclockwise in the animation at right – despite the fact that the sun rotates counterclockwise in both situations.
The Differential
The gearset proven above differs from the preceding gearsets for the reason that it is composed of miter gears rather than spur (or helical) gears. The ‘sun’ gears are the ones that do not go through the epicyclic motion experienced by the earth. And the differential can be utilized to gauge the difference in quickness between two shafts for the purpose of synchronization. Furthermore, the differential is often used in auto drive trains to conquer the difference in wheel velocity when a car encircles a corner.