Epicyclic Gear Train Experiment
UNIVERSITI TUNKU ABDUL RAHMAN
Faculty Course : : Engineering & Science Bachelor of Engineering (Hons) Mechanical Engineering Year 3/ Semester 1 Unit Code Unit Title : : UEME3133 Mechanics of Machines
Year/ : Semester Session :
Lecturer
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Experiment 1 : Epicyclic Gear Train
1. Objectives • • • • • • • To understand the working principle of epicyclic gear system. To calculate gear ratio of the epicyclic gear system. To determine the input power and output power of the epicyclic gear system. To determine the power loss of the epicyclic gear system. To measure the different stage epicyclic gear systems speed output. To measure the output torque generated by the epicyclic gear system. To calculate epicyclic gear system efficiency.
2. Theory 2.1 Introduction A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed. It reduces speed and increases torque. To create large gear ratio, gears are connected together to form gear trains. They often consist of multiple gears in the train. The smaller gears are one-fifth of the size of the larger gear. Electric motors are used with the gear systems to reduce the speed and increase the torque. Electric motor is connected to the driving end of each train and is mounted on the test platform. The output end output end of the gear train is connected to a large magnetic particle brake that is used to measure the output torque. Simple Gear Train - The most common of the gear train is the gear pair connecting parallel shafts. The teeth of this type can be spur, helical or herringbone. The angular velocity is simply the reverse of the tooth ratio. The main limitation of a simple gear train is that the maximum speed change ratio is 10:1. For larger ratio, large size of gear trains are required; this may result in an imbalance of strength and wear capacities of the end gears. The sprockets and chain in the bicycle is an example of simple gear train. When the
Faculty Course : : Engineering & Science Bachelor of Engineering (Hons) Mechanical Engineering Year 3/ Semester 1 Unit Code Unit Title : : UEME3133 Mechanics of Machines
Year/ : Semester Session :
Lecturer
:
Experiment 1 : Epicyclic Gear Train
1. Objectives • • • • • • • To understand the working principle of epicyclic gear system. To calculate gear ratio of the epicyclic gear system. To determine the input power and output power of the epicyclic gear system. To determine the power loss of the epicyclic gear system. To measure the different stage epicyclic gear systems speed output. To measure the output torque generated by the epicyclic gear system. To calculate epicyclic gear system efficiency.
2. Theory 2.1 Introduction A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed. It reduces speed and increases torque. To create large gear ratio, gears are connected together to form gear trains. They often consist of multiple gears in the train. The smaller gears are one-fifth of the size of the larger gear. Electric motors are used with the gear systems to reduce the speed and increase the torque. Electric motor is connected to the driving end of each train and is mounted on the test platform. The output end output end of the gear train is connected to a large magnetic particle brake that is used to measure the output torque. Simple Gear Train - The most common of the gear train is the gear pair connecting parallel shafts. The teeth of this type can be spur, helical or herringbone. The angular velocity is simply the reverse of the tooth ratio. The main limitation of a simple gear train is that the maximum speed change ratio is 10:1. For larger ratio, large size of gear trains are required; this may result in an imbalance of strength and wear capacities of the end gears. The sprockets and chain in the bicycle is an example of simple gear train. When the