190303a Flashcards
Gear teeth may be parallel to one another or they may be tapered with one large end and one smaller end
True
A gear tooth can be subdivided into 4 Distinctive quadrants. Identify the names of each of those quadrants
Face
Flank
Toe
Heel
The gear pitch line is used to divide the following gear tooth areas
Face and flank
When 2 gears are in mesh, a gap is formed between the tip of one gear tooth and the root In the opposite gear. This gap is called the:
Clearance for lubricant
Explain why some angle drive gear sets may need to be timed
The gears have been lapped in this pattern and need to be timed to continue this specific relationship
Gears may operate together as direct drive assemblies. identify two other types of gear configuration and explain the type of speed and torques changes that would be expected between the input and output members
Reduction. Speed reduction torque increase
Overdrive speed increase torque reduction
If a simple gear set has a gear ratio of 4:1 explain which member is turning at 4 revolutions
Drive (input ) member is rotating at 4 revolutions and Driven (output) will be once
Which of the following gear ratios would be a reduction gear ratio?
a) 0.10:1
b) 1.00:1
c) 10.00:1
d) 1.00:2
c) 10.00:1
When installed between a drive and a driven gear, an idler gear affects speed and torque changes between the two gears
False
It will only change the direction of rotation
Explain the purpose of an idler gear
An Idler gear is used to change the direction of rotation of the driven gear to the same as the drive gear
Name and explain the tooth design used on 2 types of external gears
a) straight cut square gear Teeth cut inline with the mounting shaft
b) Helical gear. Teeth cut at angle to the mounting shaft
Identify one common gearset where internal gears may be used
Planetary gear sets
What is another name for a double helical gear?
Herringbone gears
Straight cut spur gears and helical gears both produce axial thrust loads during operation?
False
Identify the 3 main components of a simple planetary gear set
a) Internal gear or ring gear
b) Planet pinions
c) Sun gear