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theory 4 > Hydraulics > Flashcards

Hydraulics Flashcards

Learn hydraulics... duh

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1
Q

What are hydraulic O-rings made from?

A

Fluorocarbon elastomers

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2
Q

How hot do O-rings keep their elasticity till?

A

300°C

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3
Q

What happens when O-rings overheat and burn?

A

They give off dangerous hydrogen fluoride which is toxic and forms hydrofluoric acid in your lungs from the moisture

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4
Q

What are the 2 categories for hydraulic oils?

A

Petroleum based oil

Synthetic oil

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5
Q

What type of oil is used on submarines?

What colour is it?

A

OX30

Red

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6
Q

What type of oil is used on type 23 and 45?

What colour is it?

A

OM33

Yellow/orange

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7
Q

What type of oil is used on type 22, 42 and CVS vessels?

What colour is it?

A

OX40

Green

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8
Q

What are the desirable properties of hydraulic oil?

A 
As incompressible as possible
Easy to flow through pipes and tubes
Sealing properties
Lubrication properties 
Transmits heat easily
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9
Q

What are the desirable properties of hydraulic oil?

A 
As incompressible as possible
Easy to flow through pipes and tubes
Sealing properties
Lubrication properties 
Transmits heat easily
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10
Q

What does demulsibility mean?

A

How easily the substance will separate from water

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11
Q

Why are anti-oxidants added to oil?

A

To remove oxygen as it bonds with hydrogen and carbon and forms a sludge which will clog the systems

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12
Q

List 6 commonly used hydraulic pumps

A 
Lobe pump
Vane pump
External gear pump
Internal gear pump
Axial piston pump
Radial piston pump
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13
Q

Briefly explain the axial pumps operation

A

The shaft turns the cylinder block which in turn moves the pistons around in a circular path. The pistons are held against an angled swash plate with springs inside the cylinder. You can increase the flow or reverse the flow by changing the angle on the swash plate.

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14
Q

What does an actuator do?

A

Converts hydraulic power into mechanical

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15
Q

What types of actuator are there?

A

Linear

Rotary

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16
Q

What is the purpose of theboil drain leg?

A

To remove excess oil that has been used to lubricate and cool the actuator parts and return it to the oil tank

17
Q

What are the advantages of hydraulics over electric motors?

A 
1/12 the size of electrical motors for the same power
High torque at low speed
Reliable
Easy to understand
Easily reversed
Infinite speed ranges
Low spark risk
Able to withstand overload

theory 4 (4 decks)

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