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46 Cards in this Set
- Front
- Back
What is pressure angle?
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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
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What is profile angle?
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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.
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What 2 things must match for gears to run properly?
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Pressure angles and Diametral Pitch
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What are the 4 laws of gearing?
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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
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Idler gears ______ the direction of rotation and transfer power to a location that is further from the driver/input shaft.
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Reverse
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Define pitch circle..
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The circle along which the speed and torque are directly transferred. Typically at the spot where the pressure angle starts.
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The speed ratio of a gear drive is _______ proportional to the gear ration.
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Inversley
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The torque ratio of a gear drive is _______ proportional to the gear ratio.
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Directly
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What are the 4 orientations of shaft axis?
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Parallel, Intersecting, Non-intersecting, Moving
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What are the 6 gear types?
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Spur, Bevel, Internal, Worm, Helical, Planetary
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A(n) ______ axis gear drive is one that the input and output shafts lie side-by-side and point in the same direction.
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Parallel
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A rack and pinion gear drive is an example of a(n) _______ axis gear drive system.
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Moving
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The type of gear designed to transfer the highest torque loads and have a locking effect on the gear drive is a ______ gear.
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Worm
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The most basic type of gear, whose teeth are cut parallel to the shaft axis, is known as a(n) _______ gear.
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Spur
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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.
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Helical
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What 4 members are in a planetary gearing system?
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Sun, Planets, Planet Carrier, Ring Gear
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A worm gear drive is an example of a ____________ axis gear drive.
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Non-intersecting
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Shafts of a(n) _________ axis gear drive typically meet at a right angle.
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Intersecting
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Diametral pitch is the ratio of ____/____
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Teeth/Pitch Diameter (PD)
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Diametral pitch is a relative measure of _______
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Tooth size
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How is direct drive achieved in a planetary gear set?
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Lock any two
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What input devices are used to control the yaw system?
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Anomometer, Wind sensor, Twist sensor
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What occurs if the carrier is the reactionary member?
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Reverse
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What occurs if the planetary gear is the inout member?
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overdrive
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What effect will a transmission have if the planetary carrier is the output member?
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reduction in speed, increase in torque
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How is number of teeth on the planetary carrier determined?
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Sun + Ring
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What 4 factors are considered when selecting oil or grease for a gear drive?
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open or closed housing, drive speed, drive load, operating temperature
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In a gearbox: Filter vs. Bladder
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Filters solid debris. Bladder absorbs moisture
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What are the 5 lubrication methods?
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Manual, Auto Lube, Bath (immersion), Drip, Spray
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What type of lubricants are used in open gearing applications?
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Grease
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Periodically shutting down a gear drive to lubricate is known as the _______ method.
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Manual
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The _____ lube method is used in high speed drives that generate high heat
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Spray
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What 2 ways can oil pumps be driven?
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Mechanically (in-line) and Electrically
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Why is gear oil cooled?
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Removes heat
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Active vs. Passive cooling
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Passive uses fins or radiator (non moving) Active uses a fan or other circulatory system.
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Forced vs. Induced cooling
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Induced pulls the air. Forced pushes the air.
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Why would we heat the gear oil in a gearbox?
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Reduce viscosity.. Avoid poor point of 8C
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What does the oil temperature sensor do?
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Turns on heating/cooling systems and generates alarms
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Why do we check the pH of coolant?
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Reduce chance of having corrosion
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Whe calculating the speed and torque of a __________ drive, you apply all of the gears that are mounted to the same shaft.
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Compound
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An even number of gears in a train causes the driven shaft to rotate in the _______ direction as the input shaft.
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Opposite
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The exception to the even/odd rule is found in _________ gear drives
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Compound and Internal
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The order of alignment of a multiple shaft drive is to start with the __________ shaft first.
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farthest downstream output
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What aspect of a gear reflects the tooth size?
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Diametral Pitch
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Backlash is necessary for what 3 reasons?
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Allows a path or channel for lubrication, Prevents jamming or undercutting, Accounts for changes in dimension due to heat.
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What two parameters are used to determine allowable backlash?
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Center distance and Diametral pitch.
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