What are the gears there in a planetary gearbox?
What are Planetary Gears? A planetary gear set is made up of three types of gears; a sun gear, planet gears, and a ring gear. The sun gear is located at the center (yellow), and transmits torque to the planet gears (blue) which are typically mounted on a moveable carrier (green).
When should I use planetary gears?
Generally, planetary gears are used as speed reducers. They are used to slow down motors and increase the torque. Torque is the working power of the machine.
Are planetary gears good?
That’s because planetary gearboxes offer high torque transmission with good stiffness and low noise in a footprint that’s more compact than that of other gearbox types.
What is a sun gear used for?
The load from the sun gear is distributed to several planetary gears which can either be used to drive an outer ring or a shaft or spindle. The central sun gear takes a high-speed, low-torque input. It drives several rotating external gears which increases the torque.
What are the advantages of planetary gears?
The advantages of planetary gearboxes:
- Coaxial arrangement of input shaft and output shaft.
- Load distribution to several planetary gears.
- High efficiency due to low rolling power.
- Almost unlimited transmission ratio options due to combination of several planet stages.
How do planetary gears increase speed?
A planetary gearhead takes a high-speed, low-torque input, say from an electric motor, then increases torque and reduces speed at the output by the gearhead ratio. This lets motors run at higher, more-efficient rpms in equipment that operates at low speeds.
How do you solve planetary gears?
To make calculating planetary gear ratios as simple as possible, note the number of teeth on the sun and ring gears. Next, add the two numbers together: The sum of the two gears’ teeth equals the number of teeth on the planetary gears connected to the carrier.
Is planetary gear reversible?
For example, in one configuration, the ring gear is maintained in a fixed position, the sun gear receives an input rotation, and an output rotation is generated at the planet carrier, which rotates about its central axis. A reversible planetary gear assembly has been developed.
What are the gears in a planetary gear set?
Planetary gear sets contain a central sun gear, surrounded by several planet gears, held by a planet carrier, and enclosed within a ring gear. The sun gear, ring gear, and planetary carrier form three possible input/outputs from a planetary gear set.
How does the sun gear roll around the planet gear?
The planet and sun gears mesh so that their pitch circles roll without slip. A point on the pitch circle of the planet gear traces an epicycloid curve. In this simplified case, the sun gear is fixed and the planetary gear (s) roll around the sun gear.
How are planet gears used in an epicyclic system?
Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Planetary gears (or epicyclic gears) are typically classified as simple or compound planetary gears.
What kind of gears spin around a central axis?
Particularly mesmerizing are planetary gears, where the gears not only spin, but orbit around a central axis as well. In this article we’re going to look at the particulars of planetary gears with an eye towards investigating a particular family of planetary gear setups sometimes known as a ‘differential planetary’ set.