Chapter 12 - Gear Drives Flashcards by Justin Wolters | Brainscape

Q

What jobs do gears perform?

A

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Q

Describe pitch line of gears or cylinders

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Q

Define:

- addendum (ADD)

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Q

Define:

- dedendum (DED)

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Q

Define:

- clearance (CL)

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Q

Define:

- circular pitch (CP)

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Q

Define:

- outside diameter (OD)

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Q

Define:

- diametral pitch (DP)

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Q

Define:

- pitch diameter (PD)

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Q

Define:

- working depth (WKD)

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Q

Define:

- whole depth (WHD)

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Q

Define:

- chordal thickness (T) (or tooth thickness)

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Q

What are the conditions for proper gear meshing?

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Q

Describe pressure angle and line of action

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Q

What does a millwright use to identify a 14.5 degree pressure angle gear?

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Q

How does tooth profile affect the meshing action of two gears?

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Q

What are the purposes of backlash between gears?

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Q

What types of materials are gears made from?

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Q

What factors must be considered when choosing gears from the available materials?

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Q

What are the merits and limitations of:

- ferrous metal gears?

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Q

What are the merits and limitations of:

- non-ferrous metal gears?

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Q

What are the merits and limitations of:

- non-metallic material gears?

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Q

List four shaft arrangements

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Q

Describe the principles of operation of the following:

- external spur gears

A

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Q

Describe the principles of operation of the following:

- internal for gears

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Q

Describe the principles of operation of the following:

- rack and pinion spur gears

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Q

Describe the principles of operation of the following:

- helical gears

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Q

Describe the principles of operation of the following:

- double helical gears

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Q

Describe the principles of operation of the following:

- herringbone gears

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Q

Describe the principles and operation and the terminology associated with bevel gears, spiral bevel gears and hypoid gears

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Q

Describe, non-throated contact, throated contact, double-throated contact and how to identify thrust direction for worm and worm gear sets

A

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Q

What are the shaft arrangements for the following gear sets:

- internal spur?

A

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Q

What are the shaft arrangements for the following gear sets:

- rack and pinion?

A

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Q

What are the shaft arrangements for the following gear sets:

- double helical?

A

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Q

What are the shaft arrangements for the following gear sets:

- spiral bevel?

A

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Q

What are the shaft arrangements for the following gear sets:

- hypoid?

A

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Q

What are the shaft arrangements for the following gear sets:

- throated worm and wheel?

A

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Q

Define overdrive

A

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Q

Describe the principles of operation of positively infinitely variable drive (PIV)

A

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Q

How is greater reduction of speed achieved when a single reduction is not sufficient?

A

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Q

What type of gears and gear arrangements are used in gear reduction units?

A

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Q

What parts and materials are used in the construction of work gear reduction units?

A

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Q

Describe how to fit the worm gear to the worm in a reduction unit

A

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Q

With reference to single reduction worm gear unit:

- what configurations and directions of drive are attainable?

A

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Q

With reference to single reduction worm gear unit:

- what does hand of drive refer to?

A

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Q

With reference to single reduction worm gear unit:

- what gear ratio range is available?

A

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Q

With reference to multiple reduction units:

- how much gear ratio range is available with a primary helical reduction combined with a worm and worm gear reduction?

A

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Q

With reference to multiple reduction units:

- how much gear ratio range is available with double and triple, worm and worm gear combinations?

A

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Q

With reference to helical and herringbone reduction units:

- what shaft configurations are available?

A

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Q

With reference to helical and herringbone reduction units:

- what gear ratio changes are available with single, double, triple and quadruple reductions?

A

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Q

With reference to helical and herringbone reduction units:

- what type of bearings are used?

A

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Q

Describe the procedure for fitting both helical and herringbone gears in their respective reduction units

A

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Q

What is the applications for bevel gear units?

A

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Q

What gear ratio ranges are available with bevel gear units and mitre gear boxes?

A

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Q

What are the applications for hypoid gear units?

A

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Q

What gear ratio range is available with hypoid gear reduction units?

A

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Q

Describe the setting of bevel and hypoid gears

A

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Q

With reference to planetary gear units:

- what is the shaft configuration?

A

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Q

With reference to planetary gear units:

- what gear ratio range is available?

A

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Q

With reference to planetary gear units:

- what drive members make up these gear units?

A

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Q

Which gear is held to achieve overdrive with a planetary gear set?

A

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Q

What type of base is required for motor and gear units coupled with a flexible coupling?

A

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Q

How are drivers connected to gear reduction units?

A

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Q

Where should gear drive units be positioned?

A

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Q

Describe the merits and limitations of base-mounted and shaft-mounted gear drive units

A

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Q

Describe the placement of torque arms on gear drive units so equipped

A

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Q

Describe the lubricating systems used to lubricate gear drive units

A

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Q

Where does one find the specifications or recommendations for the grade of oil for a gear drive unit?

A

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Q

What symptoms will be present if the gear drive bearings are worn?

A

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Q

What symptoms will appear if the gear drive unit is overloaded?

A

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Q

What repair should be made if he shaft is worn or rough at the point of seal contact?

A

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Q

What checks should be made if the oil level drops but stays clean in the gear drive unit?

A

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Q

What would cause oil to get lighter and or darker in colour with use?

A

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Q

What may cause colour streaks or rings in dirty oil during a pour test?

A

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Q

What are the causes of bearing failure?

A

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