A planetary gearbox is a gearbox that consists of three different gears, including a sun gear, ring, and sun. The number of gears within a planetary system increases the efficiency of the gearbox, resulting in a higher power density and increased torque capacity. Planetary gearboxes also reduce size and vibration by up to 50%. The advantages of this type of gearbox are numerous, but most people aren’t aware of all the details.
The size of a planetary gearbox is one of its most appealing characteristics, but it also has some disadvantages. The gearbox is not as small as a traditional gearbox, and it can be prone to damage, which is a problem when the torque is large. However, it is relatively quiet compared to a standard gear-and-pinion reducer, so noise is not a huge issue with a planetary gearbox. Another benefit of planetary gears is that they are compact and low in mass.
A planetary gearbox consists of multiple planetary gears that rotate about their axes. The sun gear has N s teeth while the planet gears each have N p teeth. These teeth mesh with one another during operation to provide the torque. The number of teeth in a planetary gear set determines the rate at which the planetary gears turn. Basically, the ratio is N s – N p.
A planetary gearbox also includes bearings. The planet gear has tapered roller bearings. The rollers are held in a cage between the outer and inner races. They are not in contact with both surfaces at the same time, so the relative displacement between the planet gear and carrier gear is equal. A planet gear is not free to rotate, but does spin at the same rate as both wheels. The relative displacement between the carrier gear and the planet gear is governed by a system known as Guo and Parker’s work.
A planetary gearbox is a common reducer. Its structure provides functions of multi-tooth meshing, deceleration, and shunting. The planetary gearbox is made up of a central sun gear that rotates, while two or more outer gears orbit around it. In addition, the outer ring gear meshes with the planet gears. A planetary gearbox is highly efficient at transferring power. It can transfer up to 97% of the energy input.
Neugart planetary gearboxes with an output shaft can be used with a wide range of drive solutions. They can be equipped with a universal connecting element called a feather key. This enables quick and secure connection to a motor, allowing for the highest torque transmission in reverse mode. The compact size makes planetary gearboxes a popular choice for dynamic applications. They also have low inertia, which makes them ideal for a variety of dynamic applications.
A planetary gearbox has two types of gears: a sun gear and a ring/sun gear. The ring gear serves as the input, while the sun gear acts as the output. When the input and output are reversed, the input and output are re-arranged, yielding i=0.8 or i=1/1.25. The sun gear is also an efficient direct drive, and can be used in three-speed gear hubs.