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What is a planetary gearbox?
The internal structure of the planetary gearbox is an epicyclic gear train (also known as a planetary gear set) mainly constructed of four major parts: a sun gear, planetary gears, a ring gear and a planetary arm carrier. In this gear train, the ring gear is fixed while the sun gear (input shaft) driven by the motor is located in the center. The sun gear is driven and moves the planetary gears which are fixed on the planetary arm carrier. Every planetary gear rotates on its own axis while revolves around the sun gear. The planetary arm carrier is the output shaft of the gearbox that transmits the power of the motor when planetary gears rotate and orbit. The operation of such gear set looks similar to our planetary solar system and that is how it is named, a planetary gearbox.
Design of Planetary Gearboxes
Advantages of using planetary gearboxes
As the load in a planetary gear box is shared among multiple planets; therefore, torque transmitting capacity of planetary gearbox is very high. The torque transmission capacity can be further increased substantially by increasing the number of planet gears.
The planetary gear box is highly stable due to an even distribution of mass and increased rotational stiffness. Torque applied radially onto the gears of a planetary gear box is transferred radially by the gear, without lateral pressure on the gear teeth.
Fewer power losses result in the high efficiency of planetary gearboxes. The gearing arrangement of planetary gears tends to transfer a maximum of input energy to the desired output, due to which efficiency as high as 97% can be achieved for the first stage of a planetary gearbox.
Where are planetary gearboxes usually used?
Frequently asked questions
What is the principle of planetary gearbox?
What is the main transmission structure of the planetary gearbox?
The planetary gearbox can be divided into three sections from the appearance: input section, deceleration section and output section.
Input section: The input section refers to the end connected to the motor. Including input shaft hole, input flange
Deceleration section: The deceleration section refers to the core section of the reducer, which looks like a box from the outside, but actually contains many core components, such as planetary gears, sun gears, and ring gears.
Output section: The output pin refers to the end connected to the equipment, including the output shaft and output flange.
What are the advantages of planetary gearbox transmission?
What are the planetary gearbox installation procedures?
Before installation, to confirm that the motor and the gearbox are intact and strictly check that the motor and the gearbox connected to the dimensions of the various parts match, here is the motor positioning boss, input shaft and gearbox grooves and other dimensions and matching tolerances.
Spin the screws on the dust hole on the outside of the deceleration delan, adjust the PCS system clamping ring so that its side holes are aligned with the dust holes, and insert the inner hexagon tightness. After that, remove the motor shaft key.
Connect the motor to the gearbox naturally. When connecting, it is important to ensure that the gearbox output shaft is the same as the motor input shaft and that the outer flan is parallel. As if the heart degree is not consistent, it can cause the motor shaft to break or the gear of the reducer to wear out.
What are the precautions for installing planetary gearboxes?
Before connecting the motor to the gearbox, the motor shaft keyway should be perpendicular to the tight bolt. In order to ensure uniform force, the mounting bolts in any verse position are first screwed, but do not tighten, and then the mounting bolts in the other two verse positions are finally tightened one by one four mounting bolts. Finally, spin the tight force bolt. All tight bolts need to be secured and checked by the torque plate hand according to the indicated fixed torque data.
The correct installation between the gearbox and the mechanical equipment is the same as the correct installation between the gearbox and the drive motor. The key is to ensure that the gearbox output shaft is in the same heart as the drived part of the shaft.