Gears

Question 1

What is a rotating machine part with teeth that transmits torque?

Answer 1

Gear

Question 2

Two or more gears working in tandem is called what?

Answer 2

A transmission

Question 3

Name a big advantage of gears.

Answer 3

Prevent slipping

Question 4

Gears that are not fit in a housing are called what?

Answer 4

Open gearing

Question 5

What are the 5 groups of gears:

Answer 5

1) Spur
2) Helical
3) Bevel
4) Hypoid
5) Worm

Question 6

Which type of gear is straight cut and are the simplest type of gears?

Answer 6

Spur gear

Question 7

Name 3 reasons why spur gears are the most widely used gear type:

Answer 7

1) Low cost
2) Low maintenance
3) No end thrust

Question 8

The smaller of 2 meshing gears is generally called what?

Answer 8

The pinion

Question 9

Which gear is capable of carrying more load than the spur gear and has teeth oriented at an angle when compared to the shafts axis?

Answer 9

Helical gear

Question 10

Name 3 advantages that Helical gears have over spur gears:

Answer 10

1) Quieter
2) Less vibration
3) Higher speeds

Question 11

T or F
Helical gears require bearings designed to take thrust loads?

Answer 11

True

Question 12

Which type of gear has 2 sets of teeth on one gear with opposing tooth angles and a groove in the center?

Answer 12

Double Helical gear

Question 13

Why is there no side thrusting with double Helical bearings?

Answer 13

Thrust from one side cancels out the opposing side

Question 14

Name 3 reasons where double Helical gears are most effective:

Answer 14

1) Shock
2) Vibration
3) High speed

Question 15

Which type of gear is the same as double Helical gears except there is no groove in the center?

Answer 15

Herringbone gear

Question 16

Which type of gear has the teeth on the inside?

Answer 16

Internal gear

Question 17

Which type of gear has the pinion and gears rotating in the same direction?

Answer 17

Internal gear

Question 18

Where are internal gears typically used?

Answer 18

Planetary gears systems

Question 19

Which type of gear turns rotational motion into linear motion?

Answer 19

Rack and pinion

Question 20

Name 2 applications that rack and pinion gears are suitable for:

Answer 20

1) Oscillating
2) Reversing

Question 21

Name 5 gears that have parallel shafting:

Answer 21

1) Spur
2) Helical
3) Double Helical
4) Internal
5) Rack & Pinion

Question 22

Which type of gear can be used to transmit power at different angles?

Answer 22

Crossed-axis Helical gear

Question 23

Which type of gear consists of a Cylindrical worm that meshes with a larger gear, often called a wheel?

Answer 23

Worm gears

Question 24

Name 1 application where worm gears are suitable:

Answer 24

1) When shock loads are present

Question 25

Name 2 primary advantages to worm gears:

Answer 25

1) Quiet
2) Produces a constant speed free of pulsations

Question 26

T or F
The worm almost always drives the wheel?

Answer 26

True

Question 27

Name the 3 types of worm gears:

Answer 27

1) Cylindrical
2) Single-enveloping
3) Double-enveloping

Question 28

Which type of worm gear is the most basic, least common and is only suitable for light loads?

Answer 28

Cylindrical

Question 29

Which type of worm gear has throated teeth, higher load capacity and better shock resistance than the Cylindrical worm gear?

Answer 29

Single-enveloping

Question 30

Which type of worm gear has the highest load capacity and shock resistance of the 3 worm gears?

Answer 30

Double-enveloping

Question 31

Name a disadvantage to Bevel gears?

Answer 31

They produce thrust loads on both shafts

Question 32

Name the 4 basic types of Bevel gears:

Answer 32

1) Straight
2) Zerol
3) Spiral
4) Skew

Question 33

T or F:
Worm gears can be used in a rack to create linear motion?

Answer 33

True

Question 34

What is the play between the meshing teeth of two mating gears called?

Answer 34

Backlash