What is the purpose of 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.

Which gears are used in wind turbines?

The majority of gearboxes at the 1.5 MW rated power range of wind turbines use a one- or two-stage planetary gearing system, sometimes referred to as an epicyclic gearing system. In this arrangement, multiple outer gears, planets, revolve around a single center gear, the sun.

What is the advantage 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.

Which component uses planetary gears?

Planetary gear train (PGT) has been widely used in the transmissions of helicopters, automobiles, wind turbine, aircraft engines, etc. The main advantages of this transmission are its high efficiency, its compactness, its large transmission ratio and its large power-to-weight ratio, etc.

Why do automatic transmissions have planetary gear sets?

The basic planetary gear set consists of two or more planet gears, a sun gear and a ring gear all of which are in constant mesh. The arrangement of the above gears determines how much power will flow from one gear to another and out to the drive train when you shift.

Do turbines use gears?

A gearbox is often used in a wind turbine to increase the rotational speed from a low-speed main shaft to a high-speed shaft connecting with an electrical generator. Gears in wind turbine gearbox are subjected to severe cyclic loading due to variable wind loads that are stochastic in nature.

What is a planetary shaft gearbox *?

A planetary gearbox is a gearbox with the input shaft and the output shaft aligned. A planetary gearbox is used to transfer the largest torque in the most compact form (known as torque density). For a three-speed hub, a one-stage planetary gear system is used, for a five-speed hub a 2-stage.

How do planetary gears increase torque?

The planet gears are mounted on a joint carrier that is connected to the output shaft. The rotational speed of the output is lower than that of the drive, and the torque of the output is higher in reverse proportion. The more gear wheels mesh with each other, the higher the torque.

What are the major advantages and disadvantages of planetary gearboxes?

Advantages include high precision, low noise, and low maintenance; disadvantages include relatively low efficiency and being nonreversible. Planetary gearing incorporates a central sun gear that drives surrounding planetary gears.

How do planetary gears shift?

Around it, two or more planet gears rotate within an outside ring gear and are connected to the output shaft via a carrier. As the sun gear turns, it causes the planet gears to rotate in place along the inside of the ring. This motion, in turn, rotates the output shaft in a reverse direction.

Do automatic transmissions use planetary gears?

Planetary gears are used in applications where space is limited, as they are typically smaller than other types of gearboxes. Most modern automatic transmissions in the automotive industry use planetary gears.

What machines use planetary gears?