問題一覧
1
The INVOLUTE GEAR profile is the most common gear system used today.
2
gear is largest of the two pinion is the smallest of the two
3
true, Spur gears have their teeth cut straight across the circumference and are used to connect two parallel shafts.
4
•Internal Spur Gears, unlike spur gears, have the teeth generated on the I.D. •They are generally stronger and more efficient than the mating pinion gear. •Internal gears provide the designer with the ability to achieve higher contact and drive ratios than standard spur gears at shorter center distances. • They also enable a velocity change without a directional change.
5
FALSE -only bevel and helical gears experience axial load
6
• FALSE • The helix cut creates a wider contact area enabling higher strengths and torques to be achieved.
7
A: Top, the top of the gear tooth, A.K.A Face, Top land B: Root, bottom of gear tooth, a.k.a “flank” C: Heel, the outside-diameter-end of the gear tooth D: Toe. the inside-diameter end of the gear tooth E: Drive. the convex side of the gear tooth F: The concave side of the gear tooth
8
TRUE; Bevel Gear are used exclusively to transmit rotary motion between intersecting shafts.
9
True
10
Planetary gear systems are typically used to reduce the propeller shaft speed on more powerful aircraft engines.
11
THE SUN GEAR DRIVES THE RING GEAR AND TURNS HIGH RPM AND LOW TORQUE INTO LOW RPM AND HIGH TORQUE. - These planetary gears rotate around a fixed central sun gear.
12
• Worm gears are used when large gear reductions are needed. • It is common for worm gears to have reductions of 20:1, and even up to 300:1 or greater.
13
True
14
If the gears are meshed too high in relation to the teeth, the load will be transmitted to the smallest portion of the tooth, breaking the teeth because of the load area.
15
The lashes and patterns are generally most critical where directional changes are made because; they’re adjustable by moving the gears inward or outward to obtain the correct relationship.
16
feeler gauge or dial gauge to measure backlash
17
True, Worm and Worm Wheel assemblies must be mounted on perpendicular, non-intersecting shafts.
18
TRUE • These planetary gears rotate around a fixed central sun gear. • In some planetary gear systems, the sun gear is the drive gear and the ring gear is fixed in the nose section of the engine.
19
divide 146 by 26 = 5.61 5.61 : 1
20
56 divided by 16 = 3.5 3.5:1
21
To find the total reduction ratio • multiply all numbers to get the total reduction ratio EXAMPLE: 1 X 5.6 X 1 X 3.5 = 19.6
22
false, gears are used to gain a mechanical advantage and or to change the direction of movement.
23
• The worm is self-locking when the helix angle is less than 5°. • Worm and Worm Wheel assemblies must be mounted on perpendicular, non-intersecting shaft
24
Heel; located at the largest diameter of the bevel gear Toe; located at the smallest diameter
25
Involute gear, Yes
26
a rolling type contact with no sliding involved
27
Pinion, Yes the big gear can be driven by the pinion or be it’s own driver
28
1. Straight Cut 2. helical 3. bevel 4. spiral bevel 5. worm
29
straight tooth
30
Helical gear
31
Bevel
32
Spiral Bevel
33
Worm gear. resembles a screw
34
1. spur gears 2. gear (crown) and pinion 3. planetary 4. worm and wheel
35
1. transmitting motion 2. changing speed 3. changing direction
36
Spur gear set
37
Planetary Gear system
38
a fixed Sun gear in the centre allows the planetary gears to spin around it
39
it is determined by how the teeth of one gear mate with teeth of another gear
40
the middle area
41
gauge pins are used to check for dimensionally damage on the gears teeth to see wear
42
the rotational arc clearance between a pair of mounted gears in any gear set, some amount of backlash (clearance) is necessary to prevent damage brought about by gear tooth interference
43
Parallel
44
worm gear
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1
The INVOLUTE GEAR profile is the most common gear system used today.
2
gear is largest of the two pinion is the smallest of the two
3
true, Spur gears have their teeth cut straight across the circumference and are used to connect two parallel shafts.
4
•Internal Spur Gears, unlike spur gears, have the teeth generated on the I.D. •They are generally stronger and more efficient than the mating pinion gear. •Internal gears provide the designer with the ability to achieve higher contact and drive ratios than standard spur gears at shorter center distances. • They also enable a velocity change without a directional change.
5
FALSE -only bevel and helical gears experience axial load
6
• FALSE • The helix cut creates a wider contact area enabling higher strengths and torques to be achieved.
7
A: Top, the top of the gear tooth, A.K.A Face, Top land B: Root, bottom of gear tooth, a.k.a “flank” C: Heel, the outside-diameter-end of the gear tooth D: Toe. the inside-diameter end of the gear tooth E: Drive. the convex side of the gear tooth F: The concave side of the gear tooth
8
TRUE; Bevel Gear are used exclusively to transmit rotary motion between intersecting shafts.
9
True
10
Planetary gear systems are typically used to reduce the propeller shaft speed on more powerful aircraft engines.
11
THE SUN GEAR DRIVES THE RING GEAR AND TURNS HIGH RPM AND LOW TORQUE INTO LOW RPM AND HIGH TORQUE. - These planetary gears rotate around a fixed central sun gear.
12
• Worm gears are used when large gear reductions are needed. • It is common for worm gears to have reductions of 20:1, and even up to 300:1 or greater.
13
True
14
If the gears are meshed too high in relation to the teeth, the load will be transmitted to the smallest portion of the tooth, breaking the teeth because of the load area.
15
The lashes and patterns are generally most critical where directional changes are made because; they’re adjustable by moving the gears inward or outward to obtain the correct relationship.
16
feeler gauge or dial gauge to measure backlash
17
True, Worm and Worm Wheel assemblies must be mounted on perpendicular, non-intersecting shafts.
18
TRUE • These planetary gears rotate around a fixed central sun gear. • In some planetary gear systems, the sun gear is the drive gear and the ring gear is fixed in the nose section of the engine.
19
divide 146 by 26 = 5.61 5.61 : 1
20
56 divided by 16 = 3.5 3.5:1
21
To find the total reduction ratio • multiply all numbers to get the total reduction ratio EXAMPLE: 1 X 5.6 X 1 X 3.5 = 19.6
22
false, gears are used to gain a mechanical advantage and or to change the direction of movement.
23
• The worm is self-locking when the helix angle is less than 5°. • Worm and Worm Wheel assemblies must be mounted on perpendicular, non-intersecting shaft
24
Heel; located at the largest diameter of the bevel gear Toe; located at the smallest diameter
25
Involute gear, Yes
26
a rolling type contact with no sliding involved
27
Pinion, Yes the big gear can be driven by the pinion or be it’s own driver
28
1. Straight Cut 2. helical 3. bevel 4. spiral bevel 5. worm
29
straight tooth
30
Helical gear
31
Bevel
32
Spiral Bevel
33
Worm gear. resembles a screw
34
1. spur gears 2. gear (crown) and pinion 3. planetary 4. worm and wheel
35
1. transmitting motion 2. changing speed 3. changing direction
36
Spur gear set
37
Planetary Gear system
38
a fixed Sun gear in the centre allows the planetary gears to spin around it
39
it is determined by how the teeth of one gear mate with teeth of another gear
40
the middle area
41
gauge pins are used to check for dimensionally damage on the gears teeth to see wear
42
the rotational arc clearance between a pair of mounted gears in any gear set, some amount of backlash (clearance) is necessary to prevent damage brought about by gear tooth interference
43
Parallel
44
worm gear