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Moco > 2nd Half Second Semester > Flashcards

2nd Half Second Semester Flashcards

1
Q

Gerotor

A

black ring around motor

Wider gerotor, more surface area, more torque

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2
Q

Function of Oil

A

Transmits energy/power

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3
Q

Double Acting Cylinder

A

2 directions

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4
Q

Reservoir Purposes

A
  • Hold oil
  • helps cool the oil
  • places for extra oil to go
  • allows oil to rest, foreign matter in oil allowed to sink to bottom of reservoir
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5
Q

Advantages of Hydraulics

A
  1. Variable Speed
  2. Very Easily Reversible
  3. Overload (easy to avoid, won’t even try)
  4. Usually components are smaller, size matters
  5. Can be stalled without hurting anything
  6. Quiet (the actuator) - can separate loud vs. quiet parts
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6
Q

Cubic inches of a gallon (magic number)

A

231 cubic inches of a gallon

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7
Q

How determine torque in rotary actuator?

A

Torque determined by pressure & area oil is pushing -load on motor determines pressure because it’s resisting flow of oil into actuator -area & psi tell torque = load

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8
Q

0.0007 assumes?

A

80%

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9
Q

Reducing coupling

A

up

Converts smaller to bigger pipe

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10
Q

Proportional Valve

A

Electrical directional control that can control flow, can move spool cooly under control

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11
Q

Every system should have a _____

A

Filter

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12
Q

Union

A

Can move sections of pipe without twisting pipe

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13
Q

What does gauge read in Tandem Center?

A

Zero

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14
Q

Cavitation

A

not getting enough fluid for what the pump wants

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15
Q

Symptoms that air might be in oil

A

Noisy, things don’t operate the way they should

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16
Q

Why does cylinder slow @ end of stroke?

A

Air cushion

-Retract is faster because less area to push oil into when cylinder is extended

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17
Q

How heavy is gallon of oil?

A

6#’s

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18
Q

Precharge

A

when charging up accumulator

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19
Q

What does flow control do?

A

Controls the speed of the actuator

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20
Q

Which flow control method is preferred?

A

Meter Out

Don’t use bypass, will pull oil out because it’s the pass of least resistance

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21
Q

Proper name of Tandem Center/all control valves

A

“4 way direction lever operated spring tandem center conrol valve”

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22
Q

Figure out amps in system

A

746 watts/HP

flow gauge says 2 gpm @ 300psi 2gpm*300psi*0.0007=0.42

  1. 42*746=313.32
  2. 32/120=2.6 amps
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23
Q

What happens when we compress compressible fluid?

A

If compress 1/2, pressure will double

Nitrogen is compressible fluid, oil is not

Decrease volume by 1/2, pressure will double

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24
Q

3 options for flow control

A
  1. Meter In
  2. Meter Out
  3. Bypass
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25
Q

Single Acting Cylinder

A

-Retract by a spring, gravity, a person, etc -forklift mast, pallet jack

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26
Q

Why would pressure gauge differ from flow gauge?

A

Pres. Relief Valve is setting the pressure, some flow being diverted @ PRV, going back to tank, that’s why pressure gauge <flow>
</flow>

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27
Q

Tubing is measured in ______

A

OD

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28
Q

Another name for motor

A

Rotary Actuator

29
Q

Issue with motors in SERIES?

A

Different loads will cause motors to have different speeds

Motor with lighter load will be driving system

30
Q

Pipe is measured in ____

A

ID

31
Q

Velocity

A

Displacement over time & a direction

32
Q

Pascal’s Law

A

Pressure applied on a confined fluid is transmitted undiminished in all directions, and acts with equal force on equal areas and at right angels to them

33
Q

How pipe fits together

A

Pipe fittings threaded, leaking will happen

  • can use teflon tape to seal area off
  • threads on pipe are tapered a bit so more it goes in, tighter it gets
34
Q

Rods should be in _____

A

Tension

Rods can buckle in compression

35
Q

What type of center with >1 valve?

A

Closed center or power thru

36
Q

3 Types of Working Lines

A
  1. Suction or Pump Inlet
  2. Pressure
  3. Return
37
Q

Accumulator Gas

A

use inert gas, Nitrogen

38
Q

How tubing fits together

A

metal to metal seals on surface, nut forces them together, no seal

39
Q

Drain Lines

A

-Short Dashes -takes supplemental leakage and puts it back into reservoir

40
Q

H-series motor Side Load

A

Perpendicular to shaft

41
Q

How to measure flow in system?

A

Flow Gauge

42
Q

Why don’t we want 90-degree corner?

A

Because turbulent flow

43
Q

Pilot Lines

A

-Long Dashes -Transmits data (pressure) to pressure relief valve -always have one on the pressure line

44
Q

Control Valve Direction Cheat Sheet

A

First box: Up-down

Third Box: Top Left to Bottom Right; TR-BL

45
Q

What type of Lever is hydraulics?

A

1st Class Lever

46
Q

3 Types of Lines

A
  1. Working Lines 2. Pilot Lines 3. Drain Lines
47
Q

Energy Triangles

A

Determines which direction energy is going

48
Q

Accumulator

A

We use it for storage, overflow

adds flow to the system

Can add flow to system for a period of time

49
Q

H-series motor Thrust Load

A

Load parallel to shaft

50
Q

Stop Tubes

A

Put on inside to limit extend

Put on outside to limit retract

51
Q

Extend vs. Retract Cylinder

A

Extend will have more force than retract

52
Q

Issue with motors in PARALLEL?

A

Wouldn’t work, pressure would go to path of least resistance, motor with lightest load would run; heavier motor may not run

  • Could use this on wagon unit, connected together by floor gives it commonality
  • would put chain b/t motors so they can run together at same speed
53
Q

How heavy is gallon of water?

A

8#’s

54
Q

Tandem Center

A

Low system pressure due to no resistance of flow

-keeps oil moving, pump to tank

55
Q

HP Actual Formula

A

GPM*PSI*0.0007

56
Q

Bang Bang

A

Solenoid operated control valve

57
Q

Reducing bushing

A

Down

Converts bigger to smaller pipe

58
Q

Working Line Velocity

A

7-20 fps

59
Q

Check Valve

A

Free flow 1 way, control flow other way

<o>

<p>Flow pushes ball against arrow, blocks</p>

<p>Put on both ends so it meters out</p>
</o>

60
Q

3 places filter can go

A
  1. Before Pump
    * Not seen often as it restricts pump but good for filtering
  2. After Pump
  • Pro: Catches crap before it goes out in system
  • Con: must be designed to withstand pressure of system
  1. Going into Reservoir (end of system)
  • Pro: Doesn’t restrict flow, really cheap
  • Con: worst possible position, crap has already flowed through system
61
Q

Pump Inlet Velocity

A

2-4 fps

62
Q

Directional valves we use have _____ ways

A

Four Ways

63
Q

Open Center

A
  • Pressure is whatever it takes to get oil back to tank
  • Can have cylinder creep
64
Q

Aeration

A

Air in oil

65
Q

What type of valve is pressure relief valve?

A

Infinite Position valve

66
Q

HP theoretical formula?

A

(GPM*PSI)/1714

67
Q

Directions in control valve

A

Left Box: P-A; B-T

Right Box: (BL-TR) P-B

(TL-BR) A-T

68
Q

3 Hydraulic Motors

A
  1. Gear
  2. Vane
  3. Piston

Moco (4 decks)

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