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Does planetary gear increase torque?
A planetary gearhead takes a high-speed, low-torque input, say from an electric motor, then increases torque and reduces speed at the output by the gearhead ratio.
How do you add gear ratios?
The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).
Are planetary gearboxes reversible?
One planet meshes with the sun gear, while the second planet meshes with the ring gear. For this case, when the carrier is fixed, the ring gear rotates in the same direction as the sun gear, thus providing a reversal in direction compared to standard epicyclic gearing.
How to calculate the load on planetary gear?
Since the tooth forces run in a straight line, the distance between the line of action of the forces and the centre of one gear remains constant, this distance being equal to the base circle radius $r_b$. As a result of this, provided the input torque $T_i$ remains constant, the sumof the tooth forces will be equal to a constant value.
How are torque and speed calculated in a gear train?
It is used to calculate the speed and torque of the output shaft when input and output shafts are connected using a gear train. Input gear where torque is applied is known as driver. Whereas output gear is known as a driven gear. And gears used in between the driver and driven gears are known as idler gears.
Why do you need a planetary gear system?
One of the main reasons to use planetary gear systems is to increase total torque. Every planet in the system adds a new path for force to flow. So where you may be limited by tooth strength, adding planets will allow you transmit the torque through multiple teeth. Genius!
How to calculate the gear ratios of a planetary epicyclic?
Direction of Rotation. Iif the calculated result is negative, the driver and follower will rotate in opposite directions; otherwise, a non-negative answer means tha both will rotate in the same direction. Figures 19 – 22 are used to obtain the speed ratios when there are two driving members rotating at different speeds.