Gear Basics: Types and Geometry

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Questions and Answers

What distinguishes a helical gear from a spur gear?

Helical gears mesh with a worm, while spur gears mesh with another spur gear.
Helical gears have teeth angled relative to the axis, while spur gears have straight teeth parallel to the axis. (correct)
Helical gears have a spiral thread, while spur gears have straight teeth.
Helical gears have teeth on a conical surface, while spur gears have teeth on a flat plane.

In gear geometry, what does the addendum represent?

The width of the tooth at the pitch circle.
The angle between the pitch circle and the axis.
The distance from the pitch circle to the top of the tooth. (correct)
The distance from the pitch circle to the bottom of the tooth.

Which of the following best describes the function of a pitch circle in gear design?

It is the circle at the top of the gear tooth.
It is the circle at the base of the gear tooth.
It is the circle that determines the overall size of the gear.
It is the circle that passes through the center of each tooth. (correct)

If a gear system requires high strength and low cost, which material would be most suitable?

Cast Iron (C) Signup and view all the answers

What force acts tangent to the pitch circle in a gear system?

Tangential Force (C) Signup and view all the answers

What is the 'module' of a gear, as defined in gear basics?

The ratio of the pitch diameter to the number of teeth. (B) Signup and view all the answers

What is the purpose of 'tooth inspection' in gear manufacturing?

To check the tooth thickness and tooth space. (D) Signup and view all the answers

Which of the following processes is used to 'finish' gear teeth?

Grinding (C) Signup and view all the answers

In the context of gear forces, what is the significance of axial force?

It acts along the axis of the gear. (D) Signup and view all the answers

What is the difference between 'gear ratio' and 'velocity ratio'?

Gear ratio relates to the number of teeth, while velocity ratio relates to angular velocities. (B) Signup and view all the answers

What is indicated by a gear ratio greater than 1?

The output gear rotates slower than the input gear. (B) Signup and view all the answers

In gear manufacturing, which of the following is a process that utilizes a shaping machine to cut gear teeth?

Shaping (A) Signup and view all the answers

What is the primary reason steel is a common material for gears?

High strength and durability. (A) Signup and view all the answers

Why might brass be chosen as a gear material?

For applications requiring low friction and corrosion resistance. (D) Signup and view all the answers

What is the significance of 'dedendum' in gear geometry?

It defines the distance from the pitch circle to the bottom of the tooth. (C) Signup and view all the answers

What is the purpose of pitch inspection?

Checking the pitch diameter and pitch angle. (A) Signup and view all the answers

What is the primary function of a gear?

To transmit rotational motion from one shaft to another. (B) Signup and view all the answers

What distinguishes a bevel gear from other gear types?

Bevel gears have teeth on a conical surface. (B) Signup and view all the answers

How is mechanical efficiency defined in the context of gears?

The ratio of output force to input force. (A) Signup and view all the answers

What type of gear system uses a toothed bar (rack) and a gear (pinion)?

Rack and Pinion system (C) Signup and view all the answers

Flashcards

Gear

A toothed wheel that transmits rotational motion from one shaft to another.

Tooth

A projection on the gear that meshes with another gear.