Contents
How efficient are planetary gears?
The efficiency loss in a planetary gear train is typically about 3% per stage. This type of efficiency ensures that a high proportion (about 97%) of the energy being input is transmitted through the gearbox, rather than being wasted on mechanical losses inside the gearbox.
How is planetary gear efficiency calculated?
According to Molian, a few simple rules suffice to approximate the efficiency of a compound geartrain. where R is the number of teeth in the large gear divided by the number of teeth in the small gear. For helical gears the value of L given by the chart must be multiplied by 0.8 cos λ, whereλ is the spiral angle.
What is the function of a planetary gearset in a CVT?
The systems considered consist of two compound planetary gear trains connected through a CVT pulley system to provide the power/torque split and recirculation function, without the use of additional clutches and/or chain drives.
Does CVT have planetary gears?
They are used to improve fuel economy, as CVTs are typically designed to keep the engine in its most efficient and ideal power delivery range. There are, however, versions of CVTs that use planetary gears. Called epicyclic CVTs, or planetary CVTs, these transmissions use planet gears to transfer torque.
Which is the outgoing shaft of a planetary gearbox?
The outgoing shaft is the planetary holder (2) stage 2 which has 35 times lower rotational speed than the electric motor. The thin washer (3) is used as a distance between the planetary holders stage 1 and 2.
How is power transferred to the planetary wheel?
The power is transferred to the planetary wheels stage 2 (2) through the sun wheel stage 2 (4) that has the same rotational speed as the planetary holder stage 1. The outgoing shaft is the planetary holder (2) stage 2 which has 35 times lower rotational speed than the electric motor.
What is the thesis of Atlas copcos gearbox?
This Bachelor of Science thesis consists of an efficiency evaluation and creation of a theoretical model for an Atlas Copcos epicyclic gearbox. The thesis starts with a theoretical chapter containing the fundamentals of epicyclic gearing and the build of the specific gearbox investigated.