PDF FILE - Many machines use gears. A very good example is a bicycle which has gears that make it easier to cycle, especially up hills. Bicycles normally have a large gear wheel which has a pedal attached and a selection of gear wheels of different sizes, on the back wheel. When the pedal is revolved the chain pulls round the gear wheels at the back. Look at the gear wheel with the pedal attached and compare it in size to the gear wheels in the centre of the back wheel.

What do you notice about them? Can you name any other machines that use gears? Most people have experienced cycling up a hill.

*RSLQDWK 3URI 0 0 0D XUDP,QGLDQ,QVWLWXWHRI7HFKQRORJ 0DGUDV Module 2 - GEARS. Lecture 1 - INTRODUCTION. 1.1 History of gears. 5. Download Mikroe C Compiler Crack. 61 ©2005 Robomatter Inc. RE 2.5_RW 1.1 Mechanics Gears Ratios and Speed / Problem Solving Note to the teacher On this page, students will learn about the. Technique for EXAMING Epicyclic Gear Box Krish Gupta, Ajay Sharma. Number of teeth, for both gear trains). Angular velocity ratio o i R v T T T which is equal to. Gears, Velocity Ratios and Mechanical Advantage. What is Velocity Ratio. Gear Ratio = # teeth input gear / # teeth output gear.

The steeper the hill gets the more difficult it is to pedal. Normally a cyclist will change gears to make it easier. When the cyclist changes gear, the chain moves from a small gear to a larger gear with more teeth, making it easier to push the pedals round. The more teeth the back gear (sprocket gear) has, the easier it is to cycle up hill although the bicycle moves forward more slowly. What will happen if a cyclist going up a hill changes gear from a larger to a smaller gear wheel?

Will it be easier or harder to pedal? GEAR RATIO (VELOCITY RATIO) The reason bicycles are easier to cycle up a hill when the gears are changed is due to what is called Gear Ratio (velocity ratio). Gear ratio can be worked out in the form of numbers and examples are shown below. Basically, the ratio is determined by the number of teeth on each gear wheel, the chain is ignored and does no enter the equation. EXAMPLE: If the pedal gear revolves once how many times will the sprocket gear revolve?

The example above shows that every time the pedal gear revolves twice the sprocket gear on the back wheel revolves once making it easier to cycle up hill. Definitive Technology Powerfield Subwoofer 700 Watts Manual.

Atch Stainless Night. Illustration from Army Service Corps Training on Mechanical Transport, (1911), Fig. 112 Transmission of motion and force by gear wheels, compound train. A gear train is a formed by mounting on a frame so the teeth of the gears engage. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. The transmission of rotation between contacting toothed wheels can be traced back to the of Greece and the of China. Illustrations by the Renaissance scientist show gear trains with cylindrical teeth.