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PMMI REVIEW - Gear Drives

Total questions: 15

Worksheet time: 8mins

Name

Class

Date

Define the pitch circle of a gear

The pitch circle is the circle formed by the gear's outer diameter

The pitch circle is the physical circle where the gear teeth are located

The pitch circle of a gear is an imaginary circle that passes through the point where the teeth of two gears mesh together.

The pitch circle is the circle where the gear's center is located

what is the importance of a gears pitch diameter

Pitch diameter only affects the color of the gear

The pitch diameter of a gear has no impact on its performance

Gear pitch diameter is related to the gear's weight

The pitch diameter of a gear is crucial for determining gear ratio, tooth profile, and overall performance.

How to calculate the gear ratio of a gear drive

Gear Ratio = Number of Teeth on Driving Gear / Number of Teeth on Driven Gear

Gear Ratio = Number of Teeth on Driven Gear / Number of Teeth on Driving Gear

Gear Ratio = Number of Teeth on Driven Gear * Number of Teeth on Driving Gear

Gear Ratio = Number of Teeth on Driven Gear - Number of Teeth on Driving Gear

How to calculate Output Shaft Speed (OSS) of a gear drive

OSS = Input shaft speed (RPM) / Gear Ratio

OSS = Input Shaft Speed (RPM) - Number of Teeth on Input Gear

OSS = Input Shaft Speed (RPM) - Gear Ratio

OSS = Input Shaft Speed (RPM) + Number of Teeth on Output Gear

What are four types of gear drives

Spiral gear drives, cone gear drives, Shaft gear drives, Solid gear drives

Straight gear drives, Linear gear drives, Radial gear drives, Bearing gear drives

Spur gear drives, Helical gear drives, Bevel gear drives, Worm gear drives

What is a gear drive?

What advantage does a gear drive system have over a belt drive

Less friction loss than belt drives, which results in higher transmission and efficiency.

Less durable than a belt drive

Belt drives are expected to last longer

Limited compatibility with different machinery

What type of gears are the most common type used in mechanical drive systems.

Helical gears

Bevel gears

Worm gears

Spur gears

Describe the operation of a spur gear drive

A spur gear drive operates by transmitting motion and power between two gears with teeth that mesh together.

A spur gear drive operates by transmitting motion and power between two gears with teeth that are not in contact.

A spur gear drive operates by transmitting motion and power between two gears with teeth that slide past each other.

A spur gear drive operates by transmitting motion and power between two gears with teeth that do not mesh together.

Describe the function of backlash in a gear drive

Backlash in a gear drive is the term used to describe the speed at which gears rotate

Backlash in a gear drive is the process of aligning gear teeth for optimal performance

Backlash in a gear drive is the noise produced by gear teeth rubbing against each other

Backlash in a gear drive is the clearance or play between mating gear teeth, necessary to prevent binding and allow for lubrication.

10.

How do you measure backlash in a gear drive system

Check the color of the gear oil

Measure the temperature of the gear system

Count the number of teeth on the gear

Measure the amount of rotation in the input shaft before the output shaft responds.

11.

Describe the function of a compound gear drive system

The function of a compound gear drive system is to generate electricity

The function of a compound gear drive system is to fly in the air

The function of a compound gear drive system is to transmit motion and power efficiently by combining gears of different sizes.

The function of a compound gear drive system is to use only one gear for efficiency

12.

Describe the function of a bevel gear drive system

A bevel gear drive system is only used for linear motion

A bevel gear drive system transmits motion between intersecting shafts by using two bevel gears with intersecting axes to change the direction of motion.

A bevel gear drive system uses helical gears to transmit motion

A bevel gear drive system changes the speed of motion by using planetary gears

13.

Describe the function of a helical gear drive

Helical gear drives are use to transmit power between parallel or crossed shafts with smoother, quieter, and more efficient operation compared to spur gears.

Helical gears are used for linear motion instead of rotational motion

Helical gears have teeth that are parallel to the axis of rotation

Helical gears are less efficient than spur gears

14.

Describe the function of a worm gear

A worm gear is used to mesh two identical gears

A worm gear is used to provide high speed output at low torque

A worm gear is used to transmit motion between non-intersecting shafts at a right angle by meshing a screw-like gear (worm) with a toothed wheel (worm gear) to provide high torque output at low speeds.

A worm gear is used to transmit motion between parallel shafts

15.

What type of preventive maintenance is done to gear drives

Using the gears at maximum capacity, Run gears to failure then replace

Replacing the gears every week, lubricate only when the boss asks me

Painting the gears, visual checks only (Pencil whipping)

Regular lubrication, inspection for wear and tear, alignment checks, and monitoring for abnormal noise or vibrations

100 %

PMMI REVIEW - Gear Drives

Total questions: 15

Worksheet time: 8mins

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