Table of Contents
- 1 How do planetary gears shift?
- 2 Can planetary gears be back driven?
- 3 How do epicyclic gears produce different gear ratios?
- 4 In which of the gearbox all gears are always in contact *?
- 5 What is the difference between planet gears and epicyclic gears?
- 6 What happens when the ring gear is stationary in the gearbox?
How do planetary gears shift?
Around it, two or more planet gears rotate within an outside ring gear and are connected to the output shaft via a carrier. As the sun gear turns, it causes the planet gears to rotate in place along the inside of the ring. This motion, in turn, rotates the output shaft in a reverse direction.
How do planetary gear boxes work?
A planetary gear set is comprised of an outer gear ring that’s called the ring gear. As they rotate inside of the ring gear, the planetary gears create pitch circles that can be formed into a gear train that, in turn, is hooked up to input and output shafts.
Can planetary gears be back driven?
A 10:1 is very easy to back drive. The largest ratio planetary gearbox I have back driven was a two stage 100:1. On a side note, if you are driving the gearbox with a DC or servo motor you will probably have to disable the dynamic braking to back drive it.
What are the advantages of epicyclic gear train?
Advantages of Epicyclic Gearbox : Compact and lightweight with high torque transmission. High radial loads on the output shaft. It is quieter in operation. Uniform distribution of load over all gears having greater tooth contact.
How do epicyclic gears produce different gear ratios?
Provided that the ring gear has a constant size, different ratios can be realized by varying the number of teeth of the sun gear and the number of teeth of the planetary gears. The smaller the sun gear, the greater the ratio.
What are different methods to analyze the epicyclic gear train?
There are several approaches used to deal with the angular velocity analysis of epicyclic gear trains, such as: the vector loop method [2], the relative velocity method [3], the tabular method [4], the algebraic method [5], and the fundamental circuit method [6, 7], which have been proposed over the last several …
In which of the gearbox all gears are always in contact *?
constant mesh gearbox
In which of the gearbox all gears are always in contact? Explanation: In constant mesh gearbox, all gears on the layshaft and main shaft are in contact all the time. For selecting gear, the dog clutch is used.
What is the working principle of an epicyclic gearbox?
The working principle of the epicyclic gearbox is based on the fact the fixing any of the gears i.e. sun gear, planetary gears and annular gear is done to obtain the required torque or speed output. As fixing any of the above causes the variation in gear ratios from high torque to high speed.
What is the difference between planet gears and epicyclic gears?
Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Planetary gears (or epicyclic gears) are typically classified as simple or compound planetary gears.
What do the red marks on an epicyclic gear mean?
The red marks show the relative displacement of the sun gear and carrier, when the carrier is rotated 45° clockwise and the ring gear is held fixed. An epicyclic gear train (also known as planetary gear) consists of two gears mounted so that the centre of one gear revolves around the centre of the other.
What happens when the ring gear is stationary in the gearbox?
As ring gear is stationary, we need to focus only on the other parts of the epicyclic gearbox i.e. Sun Gear, Planet Gear, and the Planet Carrier. As soon as the Ring Gear is stationary, the Sun Gear starts rotating which is taking the power from the clutch shaft.