Design and Technology – Systems and control | e-Consult
Systems and control (1 questions)
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a) Speed Ratio Calculation: The speed ratio is calculated as: Speed Ratio = Number of Teeth on Driven Gear / Number of Teeth on Driving Gear. Therefore, the speed ratio is 80/20 = 4.
b) Effect of Speed Ratio on Speed and Torque: A speed ratio of 4 means that for every 4 rotations of the driving gear, the driven gear rotates once. This results in:
- Speed: The cutting tool will rotate at 1/4 the speed of the driving gear.
- Torque: The torque on the cutting tool will be 4 times greater than the torque on the driving gear. Torque is directly proportional to the number of teeth on the driven gear.
c) Another Type of Gear System: Worm and Wheel. A worm and wheel system is used when a high degree of speed reduction and a large torque are required. The worm is a screw-shaped gear, and the wheel has teeth that engage with the worm. This system is commonly used in winches and elevators where a large amount of force is needed to lift heavy objects, and the speed of rotation is not critical.
| Application: Winches, elevators, and other applications requiring high torque and low speed. |