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51 Cards in this Set
- Front
- Back
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What are two types of gear drives ? |
A. Open gear drives B. Enclosed gear drives |
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Two gears mesh together with different number of teeth. The lower number of teeth on it is called a _________ gear. |
Pinion |
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Is there a mechanical advantage in a direct drive gear box ? |
No. It's a 1 to 1 ratio |
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In a speed increase gear box, the drive gear is bigger than the driven gear.
True or false |
True |
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What is the minimum number of shafts and gears to be called a compound gear train ? |
The minimum is 3 shafts and 4 gears. |
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If we have an increase in backlash, what might be the problem ? |
An increase in Backlash can be an indication that there is gear wear. |
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What three things are necessary for gears to mesh ? |
A. The same Diametral pitch B. The correct hand of gear C. The same helix angles |
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What is an overhung load or overhung gear ? |
An overhung load or overhung gear has a bearing support on only one side. |
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If you have less than 0 axial clearance, you must have____________. |
Pre-load |
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The number of teeth on a gear divided by the pitch diameter will give you the__________. |
Diametral pitch |
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What are two common pressure angles ? |
A. 14.5 degrees B. 20 degrees |
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A gear set with a pressure angles of 20 degrees is stronger than a gear set with a pressure angle of 14.5 degrees.
True/false |
True |
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What are three basic shaft arrangements ? |
A. Parallel
B. Intersecting
C. Crossing over at 90 degrees |
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What are three basic spur gear arrangements ?
Which one has the two shafts rotating in the same direction ? |
A. External
B. Internal,
It has the two shafts rotating in the same direction.
C. Rack and pinion |
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What would be the advantage of using a helical gear over a spur gear ? |
They are stronger and have more teeth in contact at one time than a spur gear of the same size. |
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What type of lube or additive is used in helical gear arrangements ? |
Extreme pressure ( EP ) additive in the oil. |
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Helical gears on parallel shafts have to have the same hand to mesh.
True/ false |
False
One meshing gear must be right-hand gear, and the other one one must be left-hand. |
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What is the main advantage to using double helical gear drives ? |
Is that the axial thrust is cancelled by the opposite row of teeth. |
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What are the three types of bevel gear sets ? |
A. Zerol bevel gear B. Straight bevel gear C. Spiral bevel gear |
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If straight bevel gears are used at angles other than 90 degrees, what are they called ? |
Angular bevel |
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Regarding shaft arrangements, a worm and wheel fall under what group ?
( Crossover, intersecting or parallel ) |
Crossover |
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What worm and wheel arrangement give the maximum tooth contact ? |
Spiral bevel gears |
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Which set of bevel gears have no axial thrust ? |
Zerol bevel gear |
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Which set of bevel gear sets cross over at 90 degrees, and have extensive sliding friction ? |
Hypoid gear |
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What effect on the gear ratio does the idler have ? |
It has no effect on the gear ratio. |
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DP= the # of teeth on the gear divided by the pitch diameter.
True/ false |
True |
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What is the Diametral pitch of these gears ? And what is the pitch diameter of the 100t gear ? |
Back (Definition) |
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The worm is always the __________ member. |
Input |
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Pitch X # of starts = ___________. |
Lead |
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What shaft arrangement does this fall under ? |
Parallel |
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Refer to the picture for questions 31 and 32
The sun gear is held, and the input is the ring. What is the results ? |
A. Decrease in speed B. Ring and carrier, same direction. |
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What is one of the disadvantages of a worm and worm wheel set ? |
Excessive sliding action on the gear teeth causing higher friction, heat and wear. This means greater energy loss through the gearboxes. |
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What shaft arrangement does this fall under ? |
Parallel |
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Refer to the picture for questions 31 and 32
The sun gear is held, and the input is the ring. What is the results ? |
A. Decrease in speed B. Ring and carrier, same direction. |
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The ring is held, and the carrier is the input. What are the results ? |
A. Increase in speed B. Carrier and sun, same direction. |
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What is the Diametral pitch of these gears ? And what is the pitch diameter of the 100t gear ? |
Back (Definition) |
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What is the Diametral pitch of these gears ? And what is the pitch diameter of the 100t gear ? |
Back (Definition) |
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Is this the correct arrangement for the tie rod setup ?
A) yes B) no |
A) yes |
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Define ( P.I.V. )....... |
Positive infinitely Variable |
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Define wide or variable speed belt code.
1228V255
What do the numbers represent ? |
12. Top width 12/16" = 3/4" 28. Groove angle 28 degrees V. Cross section " V " shape 225. Pitch length 25.5" |
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Define wide or variable speed belt code.
1228V255
What do the numbers represent ? |
12. Top width 12/16" = 3/4" 28. Groove angle 28 degrees V. Cross section " V " shape 225. Pitch length 25.5" |
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Mesh patterns should be checked in how many places ? |
The should be checked in four locations (90 degrees apart) on the driven gear. |
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Can you use the turnbuckle on a shaft mounted gear box as a belt tensioner ? |
Yes |
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How is the speed controlled/changed on a scoop tube drive ? |
The amount of fluid in the coupling can be controlled by the scoop tube which regulates the speed. |
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What is the difference between an Herringbone Gear and a Double helical gear ? |
The difference is the that the Herringbone tooth form a point at the centre of the gear, so they are more expensive to manufacture than a Double helical gear. |
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The Herringbone gears are recommended for what kinds of speeds and loads ? |
Herringbone gears are recommended for high-speed application and heavy loads. |
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Worm gearboxes usually have a hardened steel worm gear and a softer worm wheel made of brass , bronze, aluminum or other softer material.
True or false |
True |
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To achieve the maximum power capacity and life of the gear, the worm wheel should be set up so that the contact between the teeth is __________________ the leaving side of the worm wheel. |
Slightly towards |
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What is the held part in an planetary gear drive called? |
Reaction member |
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There are numerous output possibilities for a simple planetary gear set. What are the five output they can provide: |
A. Forward reduction B. Overdrive C. Reverse D. Neutral E. Direct drive |
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If two members are locked, the whole planetary set rotates as a group and produces what kind of output? |
Direct drive |
