Epicyclic gear train- finding teeth

In summary, the conversation discusses the need for a gear ratio of 1:100 for the redesign of gear D, with the requirement of 100 teeth. The question then asks for the number of teeth on gear C and the planet gears. The following question provides additional information about an epicyclic gear C, which is fixed and has an efficiency of 80%. The input A rotates at 60rpm with a torque of 10Nm, and the numbers of teeth on TD and TB are given as 60 and 130 respectively. The person asking for help is struggling to use the equation TC = TD + 2TB to determine the number of teeth, as there are two unknowns. They are seeking assistance with this
  • #1
shortshanks
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Homework Statement


A gear ratio is req from A/D of 1:100 and that it will be necessary to redesign D so that it has 100 teeth. Determine:
a)number of teeth on c
b)number of teeth on planet gears.

This followed on from another question.
An epicyclic gear c is the annulus and is fixed. The input A rotates at 60rpm, torque of 10Nm. Efficiency 80%.
Teeth on td=60
Teeth on tb=130

Homework Equations


I can't see how to work out teeth using tc=td+2tb when there are two unknowns.
Any help will be gratefully recieved.
Thanks

The Attempt at a Solution

 
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  • #2
Can anyone help with my question please? I am totally stuck!
 
  • #3
can anyone help me please!
 

1. How do you determine the number of teeth in an epicyclic gear train?

The number of teeth in an epicyclic gear train can be determined by using the formula: N = (R1/R2) x (Z1/Z2), where N is the number of teeth, R1 and R2 are the radii of the two gears, and Z1 and Z2 are the number of teeth on the two gears respectively.

2. What is the purpose of an epicyclic gear train?

An epicyclic gear train is used to transmit motion and power between two intersecting shafts at different speeds or directions. It is commonly used in machines and vehicles to achieve different gear ratios and torque conversions.

3. How do you calculate the gear ratio in an epicyclic gear train?

The gear ratio in an epicyclic gear train can be calculated by dividing the number of teeth on the stationary gear (sun gear) by the number of teeth on the rotating gear (planet gear). This ratio can be further modified by adding or subtracting the number of teeth on the ring gear.

4. What is the difference between internal and external gear teeth in an epicyclic gear train?

Internal gear teeth refer to teeth that are located on the inside of the gear, while external gear teeth are located on the outside. In an epicyclic gear train, the sun gear usually has external teeth, while the planet and ring gears can have either internal or external teeth.

5. How do you determine the direction of rotation in an epicyclic gear train?

The direction of rotation in an epicyclic gear train can be determined by looking at the relative motion of the sun gear, planet gear, and ring gear. If the sun gear rotates in a clockwise direction, the planet gear will rotate in the opposite direction, and the ring gear will rotate in the same direction as the sun gear. If the sun gear rotates in a counterclockwise direction, the planet gear and ring gear will rotate in the opposite directions.

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