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Hydraulics > Drive Units And Hydraulic Pump > Flashcards

Drive Units And Hydraulic Pump Flashcards

1
Q

How are hydraulic pumps powered?

A

Electrical motors or ICE

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2
Q

What is the purpose of couplings?

A

To transfer the power of drive unit to the hydraulic pump

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3
Q

What are the 2 things the coupling does?

A

Prevents fluctuations in pressure- transferring peaks to the motor and transfers motor speed to the pump

Balance out any alignment errors

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4
Q

4 types of couplings?

A

Rubber
Through shaft
Bevel gear
Square tooth with plastic insert

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5
Q

What do hydraulic pumps produce?

A

Fluid flow

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6
Q

How is pressure created?

A

When the flow meets resistance

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7
Q

What are the 2 types of resistance?

A

Internal and external

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8
Q

What is internal resistance?

A

Viscous friction through pipes and components

Flow losses at throttle points

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9
Q

What is external resistance?

A

Mechanical friction, maximum loads, static loads and acceleration forces

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10
Q

What is a positive displacement pump?

A

Ejects a fixed amount of fluid into a hydraulic system.

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11
Q

What are the advantages of a positive displacement pump?

A 
High pressure 
Small compact size
High volumetric efficiency 
Small changes in efficiency 
Can operate in a wide range of pressure requirements and ranges
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12
Q

What are the 3 main types of pumps?

A

Constant (fixed)
Adjustable
Variable

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13
Q

What are the 3 basic types of pump designs?

A

Gear - constant
Vane - adjustable
Piston - fixed or variable

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14
Q

What is the relationship between flow and rpm in a gear pump?

A

The amount of flow is proportional to the RPm

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15
Q

Pump displacement is determined by?

A

Fluid between each pair or teeth

Number of teeth

Speed of rotation

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16
Q

3 types of gear pumps?

A

External
Lobe
Gerotor

17
Q

What are the 3 main sources of leakages ?

A

Gaps between teeth

Gaps between teeth and pump housing

18
Q

What type of pump is similar to a motor car engine?

A

Piston pump

19
Q

What is the disadvantage of a piston pump?

A

Only delivers a single pulse per revolution , unacceptably large pressure pulses

20
Q

Pumps are usually fitted with what?

A

Load sensing device

21
Q

What does the LSD do?

A

Ensures pressure set by the operator is delivered

Prevents high pressure pump delivering more than what is demanded

Results in economical use or power

22
Q

What are the 2 types of LSD’s?

A

Pressure transducers, electrically and or electrically operated

Constant pressure stall valves , hydraulically operated

Hydraulics (14 decks)

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