Chapter 4 Flashcards

1
Q

three types of pumps

A

gear, vane, and piston pumps

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2
Q

gear pumps

A
  • external and internal (gerotor = inner drive gear and outer driven gear) pumps
  • less expensive, only available in fixed displacement
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3
Q

pump

A

converts mechanical power to fluid power

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4
Q

three general classifications of pumps

A
  • fixed displacement (delivers a fixed volume of fluid for each revolution)
  • variable displacement (output of fluid can be changed as pump operates)
  • pressure compensated variable volume pump (stops delivering flow at a set pressure)
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5
Q

constant flow circuit (has a fixed displacement pump)

A

Each revolution of a fixed displacement pump delivers a certain volume of fluid to the circuit. This fluid ultimately returns to the reservoir, either as a return flow, or a leakage flow.

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6
Q

slippage

A

actual flowrate will be lower than theoretical flowrate (fluid leaking back from outlet to inlet)

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7
Q

gear, vane, and piston pump

A
  • gear: lowest volumetric efficiency, very dirt tolerant

- piston: highest volumetric efficiency

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8
Q

two types of piston pumps

A
  • axial (number of pistons in a circular array within a cylinder block)
  • radial (cylinders positioned radially around the axis of rotation)
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9
Q

tandem pumps

A

two pumps in the same housing

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10
Q

pump mount

A

gearbox that is designed to power hydraulic pumps

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11
Q

flow dividers

A

valves that divide flow from a single pump to supply two circuits that operate at different pressures

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