Ever-Power new planetary reducers hire a floating sun equipment rather than a fixed position one.
The word ”There’s nothing new beneath the sun’ certainly applies to planetary reducers. And, while floating sunlight gears have been around quite a while, some sun planet gear engineers might not end up being aware of the huge benefits this unusual gear design can offer.
Traditionally, planetary reducers possess used a fixed sun gear, where in fact the centre gear is attached to or machined in to the shaft. When this set sun gear revolves, it turns the planet gears to create motion and/or power. Ever-Power new planetary reducers, however, are having a floating sun equipment rather than a set position sun gear.
Why a floating sunlight equipment? ‘In the planetary concept, the sun is the driver, or pinion, in the gear set,’Ever-Power design engineer Scott Hulstein stated. ‘Because the sun gear is in continuous connection with the planets, it’s important that it’s flawlessly 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 equipment which is securely set upon a shaft will intermittently have significantly more load using one planet equipment than on another gear Hulstein explained. ‘By enabling the sun equipment to float, it centres itself among the three planets and generates constant, equal load sharing.’
Equal load posting is just one of the benefits of this design. The floating sunlight gear provides ‘true involute actions,’ according to Hulstein. True involute action happens when the rolling motion between your mating gears is really as complete as feasible. The advantage of this comprehensive meshing of gears is usually longer reducer lifestyle, since less internal gear slippage means fewer broken gear teeth.
That also means lower noise levels. When sunlight gear is permitted to completely roll into the planet gears, there’s less ‘rattling’ as one’s teeth mesh. In place, the Ever-Power product has ‘designed out’ the gear mesh sound by allowing the sun equipment to float into place.
So why use a fixed sun gear at every? ‘Fixed sun gears are often used in true servo applications,’ Greg Pennings, Ever-Power Consumer Advocate, explained. ‘A fixed sun gear is essential when precise 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 contend with parallel shaft reducers, where backlash was less critical,’ Pennings said.
By using the floating sun equipment concept, the Ever-Power planetary reducers have the ability to exceed the torque ratings of similar sized and bigger sized parallel shaft reducers, yet maintain a lower noise levels.
Sun, Ring and Planet
The most basic kind of planetary gearset is proven in the figures above. The figure at left shows a three-dimensional look at as the figure at right offers a cross-section. In this geartrain, inputs and result can be taken from the carrier, band and sun gears, and only the earth experiences epicyclic motion. This is the many common kind of planetary gearset (with the exception of the differential) and it discovers application in speed reducers and automated transmissions. If you take apart a cordless drill, you will most 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 sun gears, and both planet gears (the yellow gears) rotate as an individual unit. The sun gears (green and brownish) can rotate independently of one another. The inputs and result can be chosen from either sun equipment and/or the carrier. Very high speed reductions can be achieved with this unit, but it can suffer from low efficiency if not really designed correctly.
Reddish colored sun input – purple sun fixed
Purple sun input – reddish colored sun fixed
The animations above show the ‘two suns – two planets’ gearset with one sun as input and the other sun fixed. Note that the carrier rotates clockwise in the animation at remaining and counterclockwise in the computer animation at right – even though the sun rotates counterclockwise in both situations.
The Differential
The gearset proven above differs from the preceding gearsets in that it is composed of miter gears rather than spur (or helical) gears. The ‘sun’ gears are those that do not go through the epicyclic movement experienced by the earth. And the differential can be utilized to measure the difference in velocity between two shafts for the purpose of synchronization. In addition, the differential is often used in auto drive trains to conquer the difference in wheel speed when a car goes around a corner.