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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 can be illustrated using a worm and wheel mechanism. In this system:
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Description of Components: The drive motor is connected to a worm that meshes with a worm wheel.
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Function: As the motor operates, it rotates the worm, which in turn rotates the worm wheel. This arrangement allows for a reduction in speed with an increase in torque, making it suitable for the ATV's performance needs.
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Variable Speed Control: To vary the speed, a variable resistor can be added to the motor's circuit, adjusting the current and subsequently the speed of the motor.
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Diagram:
where the worm is shown connected to the motor and the worm wheel is connected to the drive tracks.
This design ensures efficient performance while maintaining the required torque for various terrains.
Step 2
Identify two benefits of using a LifeGuard® safety roll bar on an ATV.
Answer
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Safety: The LifeGuard® roll bar can save lives and prevent major injuries by providing structural support during a rollover, thereby protecting the rider.
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Impact Absorption: It helps protect the ATV itself as well as the rider during a roll. The flexible nature of the roll bar absorbs a lot of the impact, reducing potential damage to the vehicle and injury to the rider. Additionally, it is easy to attach and can fit most makes and models of ATVs.