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The all-terrain vehicle (ATV) shown opposite, features a variable speed rear wheel drive transmission and a LifeGuard® safety roll bar - Leaving Cert Engineering - Question c - 2022
Question c
The all-terrain vehicle (ATV) shown opposite, features a variable speed rear wheel drive transmission and a LifeGuard® safety roll bar. (i) Describe, with the aid o... show full transcript
Worked Solution & Example Answer:The all-terrain vehicle (ATV) shown opposite, features a variable speed rear wheel drive transmission and a LifeGuard® safety roll bar - Leaving Cert Engineering - Question c - 2022
Step 1
Describe, with the aid of a diagram, a suitable variable speed drive mechanism for the ATV.
Answer
A suitable variable speed drive mechanism for the ATV involves a worm and worm wheel system. The system consists of a drive motor connected to the worm, which interacts with the worm wheel. This configuration provides a direct drive to the ATV's wheels and allows for increased torque and speed reduction, which is essential for varying terrain. The motor's speed can be adjusted using a variable resistor, enabling different speeds based on the rider's requirements.
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In this diagram, the motor drives the worm located on the motor shaft, which turns the worm wheel connected to the ATV's wheel, providing both power and flexibility in speed adjustment.
Step 2
Identify two benefits of using a LifeGuard® safety roll bar on an ATV.
Answer
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Safety Enhancement: The LifeGuard® safety roll bar could save a life and prevent major injuries in the event of a rollover.
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Damage Reduction: It helps protect both the quad and the rider during a roll, as the flexible design of the LifeGuard® absorbs a significant amount of impact, minimizing potential damage.