The speeds and torques of planetary gearboxes may be superimposed by using a ring gear that is not stationary but can be operated in any direction of rotation. It is also feasible to fix the driving shaft such that the torque is picked up by the ring gear. Planetary gearboxes have proven highly essential in a wide range of mechanical engineering applications.
They have become particularly well established in sectors where large power levels and quick speeds must be conveyed while maintaining a favourable mass inertia ratio. Planetary gears may very readily reach high transmission ratios. The gearboxes have numerous potential usage in industrial applications due to their favourable characteristics and compact form.
In this blog, we’ll provide in-depth information about the various benefits of using planetary gearboxes.
High Power Density
The quantity of power (time rate of energy transfer) per unit volume is referred to as power density. In the case of planetary gears, the load is shared by multiple planets rather than a single gear as in other forms of gearing. The more planets, the greater the load sharing and the higher the power density.
As a result, planetary gearboxes have a higher power density than ordinary parallel axis gearboxes. The primary characteristics for high power density of planetary gears include reduction owing to the huge volume of planet gears, many kinematic combinations, pure torsional responses, and coaxial shafting.
Compact Size
Planetary gearboxes are more compact due to their high power density and coaxial shaft configuration. In the case of planetary gear systems, the driving and driven members are concentric, thus the driving and driven equipment may be arranged in the same line, conserving space. The increased usage of numerous planet gears aids in achieving high gear ratios in compact areas. As a result, planetary gearboxes are better suited to applications that require great speed reduction in a small area.
Light Weight
Due to the prominent high power density and small size, the planetary gearbox is particularly light weight for the same gear ratio or torque as other classic (parallel shaft) types of gearboxes.
High Efficiency
Planetary gearboxes have a high efficiency due to low power losses (up to 3% per stage). Planetary gears’ gearing structure tends to transmit maximum input energy to desired output, resulting in efficiency as high as 97 percent for the first stage of a planetary gearbox.
High Torque Transmitting Capacity
As the load in a planetary gear box is distributed across several planets, the torque transmission capacity of the planetary gearbox is quite large. The torque transmission capacity may be significantly improved by increasing the number of planet gears.
Highly Stable
Because of the equal distribution of mass and improved rotational rigidity, the planetary gearbox is extremely stable. Torque delivered radially to a planetary gear box’s gears is transmitted radially by the gear, with no lateral strain on the gear teeth.
Longer Life
A planetary gearbox operates differently from a typical parallel gearbox. Traditional gears distribute driving force through a minimal number of contact points between two gears. All of the stress is focused on a few contacting surfaces in this scenario, causing the gears to wear fast and sometimes break. However, planetary gears have many gear contacting surfaces with a greater area, allowing the loading to be distributed uniformly around the central axis.
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