Gearspowerpointpresentation
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Gears are wheels with teeth that mesh together to change the speed, torque, and direction of rotating axles. There are different types of gears including spur gears, bevel gears, idler gears, worm gears, and belts & pulleys. Gears and pulleys transfer rotational motion and can change the speed and torque depending on their gear or pulley ratios.
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Gears have been used since the 16th century to transfer power between rotating shafts. There are different types of gears that transfer power in parallel shafts or at 90 degree angles, including spur gears, helical gears, bevel gears, worm gears, and planetary gear sets. Gears work through their teeth and gear ratios which determine the input and output rotation directions and speeds.
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2. Design considerations for gear drives are outlined, including power transmitted, speeds, velocity ratio and center distance. Strength calculations using the Lewis equation and factors for dynamic loading and wear are also covered.
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This document discusses spur gear machine design and is submitted by a group of students. It covers topics such as the definition of spur gears, classifications of gears according to axis position and peripheral velocity, advantages and disadvantages of gears, terms used in gears including pitch circle and pressure angle, and the law of gearing which states that the common normal at the point of contact between gear teeth must pass through the pitch point. References for further information are also provided.
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The document discusses gears and gear kinematics. It introduces gears as components that transmit rotational force from one shaft to another. It describes different types of gears based on the position of their axes, including spur gears, helical gears, bevel gears, rack and pinion gears, and worm gears. For each type, it provides details on their structure, advantages, and disadvantages. The document also discusses various gear terminology such as pitch circle, pressure angle, addendum, and interference. It explains how interference can be avoided by ensuring the point of contact between meshing gear teeth remains on the involute profiles.
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Gears are rotating machine parts that transmit torque via cut teeth that mesh. They can change speed, torque, and direction. Common gear types include spur gears which have parallel axes, helical gears which are quieter than spur gears, bevel gears which connect non-parallel intersecting shafts, and worm gears which provide high gear reductions and transmit power at 90 degrees. Gears offer advantages like large velocity ratios in small spaces and ability to transmit high loads, but also have disadvantages like noise and inability to transmit motion over large distances.
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Gearspowerpointpresentation
- 1. Gears, Gears and More Gears Teacher Professional Development Spring, 2002 Robotics Academy 2002. All Rights Reserved.
- 3. Different types of gears Spur gears Belts & Pulleys Bevel gears Idler gears Worm gears
- 4. Spur Gears Most “common” type of gear, a wheel with teeth. Build the following... Make sure there isn’t too much friction between the gears and the beam. The gears should spin easily. Spur gears do three things. 1. Change rot. speed 2. Change torque 3. Change direction 1x16 beam 8 tooth gear #6 axle 40 tooth gear (put bushings on the back side)
- 5. Gear Ratios The gear ratio is the ratio of the number of teeth on one gear to the number of teeth on the other gear. Gear ratio = 40 to 8 or, simplifying, 5 to 1. That means it takes 5 revolutions of the smaller gear to get 1 revolution of the larger gear. Try it! 40 teeth 8 teeth
- 6. Gear Ratios The gear ratio tells you the change in speed and torque of the rotating axles. If it takes 5 turns of the 8 tooth gear for every 1 turn of the 40 tooth gear, that means the 40 tooth gear will rotate 5 times slower than the 8 tooth gear. BUT, it also means the 40 tooth gear’s axle has 5 times the torque (rotational force) as the 8 tooth gear’s axle.
- 7. Idler Gears An idler gear is a gear that is inserted between 2 other gears. idler gear Build the following. Add another 8 tooth gear to the right of the 40 tooth gear. How many turns of the 8 tooth gear on the left does it take to make 1 turn of the new 8 tooth gear on the right?
- 9. Bevel Gears Bevel gears are spur gears that mesh at a 90 degree angle. The gear ratio rules remain the same, but the axles are perpendicular to one another. These 12 tooth bevel gears can only mesh with them-selves.
- 10. Worm Gears Build the following…. 1 2 3 4 5 #6 axle half bushing 24 tooth gear 1x6 beam 2 1x4 plates 1x4 beam full bushing worm gear #10 axle
- 11. Worm Gears Worm gears have some special properties. 1: The axles are perpen-dicular, like bevel gears. 2: How many rotations of the worm gear does it take for 1 rotation of the spur gear? The worm gear acts like a gear with 1 tooth! This gives very large gear ratios. ANSWER: 24!
- 12. Worm Gears Worm gears are not back-driveable. You can turn the worm gear’s axle, but you can’t turn the spur gear’s axle. This property is used as a locking mechanism.
- 13. Belts & Pulleys Belts & pulleys are related to gears. They change speed and torque, but with a few differences... Pulleys transfer their force by the friction of the belts, rather than direct contact with the teeth of gears. This can cause the belts to slip. Unlike gears, the pulleys rotate in the same direction.
- 14. Belts & Pulleys Belts can transfer force across long distances. Like gears, however, belts and pulleys do have a “gear ratio.” It is the ratio of the diameters of the pulleys.