Sun gears
The external gear attached to the central axis of a planetary gear mechanism is called the sun gear.
what is the purpose of a sun gear?
In planetary gearing (also known as epicyclic gearing), a center gear, called a sun gear, serves as the input and driver of the set. Three or more “driven” gears (referred to as planets) rotate around the sun gear. Finally, the planets engage with a ring gear from the inside, which makes an internal spur gear design.
Why Choose Planetary Gear?
Planetary gears are a popular type of mechanical transmission for several reasons. They are self-aligning, compact and power dense.
However, they have some practical problems. They have high sliding forces, and a lot of motion, which means energy losses are a big problem.
It is compact
Compared to other gear types, planetary gearboxes are compact and boast a high power density. They are especially suitable for applications in which space is an issue.
Planetary gears are often used in combination with ring gears to provide a greater range of transmission ratios. Often they are placed in a single housing.
These planetary gears can also be used as summation or distribution gears to distribute the power between two shafts. This is common in automotive applications (differential gears) and hybrid vehicles.
Planetary gears are very accurate with almost no backlash. They are also modular and can be stacked to form a series of gear stages with a higher power transmission efficiency.
It is self-aligning
Planetary gears are a type of helical gear arrangement that is more power dense and can be used to drive higher torques and reductions in a smaller package. They can also handle higher shock loads and overhung loads.
However, they are a bit difficult to align. Many planetary drives are mounted on a carrier, which is not easily visible during assembly, and this makes it difficult to ensure that all of the planet gears are properly aligned for simultaneous engagement with the ring gear and sun gear.
Therefore, one of the most important aspects of planetary gearing is that it is self-aligning. This is achieved through a method that includes inserting a tool into the bore in the front face of the carrier and radially expanding the fingers from the central position to engage and index the planet gears.
In addition to radially expanding the fingers, this method also includes inserting hollow axles 64 and 66 into bevel gears respectively 68 and 70 and screwing plugs 75 and 80 into sleeve 76, where the hollow axles are held in threaded engagement with the bevel gears. This ensures that the planetary gears 72 and 74 remain oriented independent of the rotary motion of the hollow axles 64 and 66 as shown in FIGS.
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What is the material of sun gear?
Nickel-Chromium-Molybdenum AISI 8620 was selected for the shaft and Nickel-Chromium-Molybdenum AISI 4320 for the gear. These alloy steels were found to have great rigidity, strength and to be the most cost effective in terms of reliability.
what is the purpose of a sun and planet gear?
The sun and planet gear is a method of converting reciprocating motion to rotary motion and was used in the first rotative beam engines.