Magic of Mechanics Epicyclic (Planetary) gears

-

Epicyclic gearing - Invention:


In the 2nd-century AD treatise Almagest, Ptolemy utilized turning deferent and epicycles that Makes epicyclic gear trains to foresee the movements of the planets. Precise expectations of the development of the Sun, Moon and the five planets, Mercury, Venus, Mars, Jupiter and Saturn, across the sky assumed that each followed a trajectory traced by a point on the planet gear of an epicyclic gear train. This curve is called an epitrochoid.

 Richard of Wallingford, an English abbot of St Albans religious community is credited for reevaluating epicyclic designing for an astronomical clock in the 14th century.


In 1588, Italian military engineer Agostino Ramelli invented the bookwheel, a vertically-revolving bookstand containing epicyclic gearing with two levels of planetary gears to maintain proper orientation of the books

How Does Epicyclic gear Work?

The Next Video will illustrate :
- How does Epicyclic gear Work 
- some Application of Epicyclic gear 
- How to make Epicyclic gear calculation 



Comments

Post a Comment

Popular posts from this blog

all about gears (kinds ,applications,.....)

-
Image
Gears Gears are Power transmission elements. It is the Gears that decides the torque, speed and direction of rotation of all the driven machine elements. Broadly speaking, Gear types may be grouped into five major categories. They are Spur, Helical, Bevel, Hypoid, and Worm. A lot of intricacies are there in the different types of gears. Actually The choice of gear type is not a very easy process. It is dependent on a number of considerations. Factors that go into it are physical space and shaft arrangement, gear ratio, load, accuracy and quality level. Types of Gears Types of Gears A number of gears are manufactured using different materials and with different performance specifications depending on the industrial application. These gears are available in a range of capacities, sizes and speed ratios, but the main function is to convert the input of a prime mover into an output with high
Read more

3- Internal Combustion Engines cooling and lubrication system (automobile engineering)

-
Image
  in the previous sections we had discuss : Classification of Internal Combustion Engines and Engine Components (Course) Internal Combustion Engines Components 2 (Course)   In This  section we will discuss : -Describe and explain the operation of a typical cooling system for an industrial ICE. -Describe and explain the operation of a typical lubrication system for an industrial ICE. SECTION 3 Objective 7 Describe and explain the operation of a typical cooling system for an industrial ICE. ENGINE COOLING Small internal combustion engines are often air-cooled. Each cylinder or motor block is equipped with many thin fins creating an extensive cooling surface. This has the advantages of being simple and cheap, but the disadvantage of lack of control of the engine temperature because the cooling efficiency depends on the weather conditions. For high compression diesel engines, the combustion temperature can exceed 2000°C, and only 30 - 35% of the heat is converte
Read more

Fundamentals of Refrigeration and Air-Conditioning (course)

-
Image
 Refrigeration: The process of removing heat. Air-conditioning: A form of air treatment whereby temperature, humidity, ventilation, and air cleanliness are all controlled within limits determined by the requirements of the air conditioned enclosure. 1.1 Basic physics – temperature The general temperature scale now in use is the Celsius scale, based nominally on the melting point of ice at 0°C and the boiling point of water at atmospheric pressure at 100°C. (By strict definition, the triple point of ice is 0.01°C at a pressure of 6.1 mbar.) On the Celsius scale, absolute zero is – 273.15°C. In the study of refrigeration, the Kelvin or absolute temperature scale is also used. This starts at absolute zero and has the same degree intervals as the Celsius scale, so that ice melts at + 273.16 K and water at atmospheric pressure boils at + 373.15 K. 1.2 Heat Refrigeration is the process of removing heat, and the practical application is to produce or maintain tempera
Read more