Gear Drives

Front 1

What is pressure angle?

Back 1

The angle at a pitch point between the line of action which is normal to tooth surface, and a line tangent to the pitch circles of both gears

Front 2

What is profile angle?

Back 2

The angle at a pitch point between the line of pressure which is normal to the pitch circle, and a line tangent to the pitch surface.

Front 3

What 2 things must match for gears to run properly?

Back 3

Pressure angles and Diametral Pitch

Front 4

What are the 4 laws of gearing?

Back 4

1) Two external gears in mesh will always rotate in the opposite direcion 2) An internal gear and an externally-toothed gear in mesh will always rotate in the same direction 3) A small diameter gear driving a larger diameter gear increases torque output and decreases speed output, achieves reduction 4) A large diameter gear driving a smaller diameter gear decreases torgue and increases speed output, achieves gear overdrive

Front 5

Idler gears ______ the direction of rotation and transfer power to a location that is further from the driver/input shaft.

Back 5

Reverse

Front 6

Define pitch circle..

Back 6

The circle along which the speed and torque are directly transferred. Typically at the spot where the pressure angle starts.

Front 7

The speed ratio of a gear drive is _______ proportional to the gear ration.

Back 7

Inversley

Front 8

The torque ratio of a gear drive is _______ proportional to the gear ratio.

Back 8

Directly

Front 9

What are the 4 orientations of shaft axis?

Back 9

Parallel, Intersecting, Non-intersecting, Moving

Front 10

What are the 6 gear types?

Back 10

Spur, Bevel, Internal, Worm, Helical, Planetary

Front 11

A(n) ______ axis gear drive is one that the input and output shafts lie side-by-side and point in the same direction.

Back 11

Parallel

Front 12

A rack and pinion gear drive is an example of a(n) _______ axis gear drive system.

Back 12

Moving

Front 13

The type of gear designed to transfer the highest torque loads and have a locking effect on the gear drive is a ______ gear.

Back 13

Worm

Front 14

The most basic type of gear, whose teeth are cut parallel to the shaft axis, is known as a(n) _______ gear.

Back 14

Spur

Front 15

The type of gear whose teeth are cut at an angle to the axis of rotation and can be operated at higher speeds and loads than a spur gear, is known as a(n) _______ gear.

Back 15

Helical

Front 16

What 4 members are in a planetary gearing system?

Back 16

Sun, Planets, Planet Carrier, Ring Gear

Front 17

A worm gear drive is an example of a ____________ axis gear drive.

Back 17

Non-intersecting

Front 18

Shafts of a(n) _________ axis gear drive typically meet at a right angle.

Back 18

Intersecting

Front 19

Diametral pitch is the ratio of ____/____

Back 19

Teeth/Pitch Diameter (PD)

Front 20

Diametral pitch is a relative measure of _______

Back 20

Tooth size

Front 21

How is direct drive achieved in a planetary gear set?

Back 21

Lock any two

Front 22

What input devices are used to control the yaw system?

Back 22

Anomometer, Wind sensor, Twist sensor

Front 23

What occurs if the carrier is the reactionary member?

Back 23

Reverse

Front 24

What occurs if the planetary gear is the inout member?

Back 24

overdrive

Front 25

What effect will a transmission have if the planetary carrier is the output member?

Back 25

reduction in speed, increase in torque

Front 26

How is number of teeth on the planetary carrier determined?

Back 26

Sun + Ring

Front 27

What 4 factors are considered when selecting oil or grease for a gear drive?

Back 27

open or closed housing, drive speed, drive load, operating temperature

Front 28

In a gearbox: Filter vs. Bladder

Back 28

Filters solid debris. Bladder absorbs moisture

Front 29

What are the 5 lubrication methods?

Back 29

Manual, Auto Lube, Bath (immersion), Drip, Spray

Front 30

What type of lubricants are used in open gearing applications?

Back 30

Grease

Front 31

Periodically shutting down a gear drive to lubricate is known as the _______ method.

Back 31

Manual

Front 32

The _____ lube method is used in high speed drives that generate high heat

Back 32

Spray

Front 33

What 2 ways can oil pumps be driven?

Back 33

Mechanically (in-line) and Electrically

Front 34

Why is gear oil cooled?

Back 34

Removes heat

Front 35

Active vs. Passive cooling

Back 35

Passive uses fins or radiator (non moving) Active uses a fan or other circulatory system.

Front 36

Forced vs. Induced cooling

Back 36

Induced pulls the air. Forced pushes the air.

Front 37

Why would we heat the gear oil in a gearbox?

Back 37

Reduce viscosity.. Avoid poor point of 8C

Front 38

What does the oil temperature sensor do?

Back 38

Turns on heating/cooling systems and generates alarms

Front 39

Why do we check the pH of coolant?

Back 39

Reduce chance of having corrosion

Front 40

Whe calculating the speed and torque of a __________ drive, you apply all of the gears that are mounted to the same shaft.

Back 40

Compound

Front 41

An even number of gears in a train causes the driven shaft to rotate in the _______ direction as the input shaft.

Back 41

Opposite

Front 42

The exception to the even/odd rule is found in _________ gear drives

Back 42

Compound and Internal

Front 43

The order of alignment of a multiple shaft drive is to start with the __________ shaft first.

Back 43

farthest downstream output

Front 44

What aspect of a gear reflects the tooth size?

Back 44

Diametral Pitch

Front 45

Backlash is necessary for what 3 reasons?

Back 45

Allows a path or channel for lubrication, Prevents jamming or undercutting, Accounts for changes in dimension due to heat.

Front 46

What two parameters are used to determine allowable backlash?

Back 46

Center distance and Diametral pitch.