Bomag Hidraulica [PDF]

Zitiervorschau

BOMAG FAYAT GROUP

TRAINING

Hydraulic Circuits

by winni

BOMAG FAYAT GROUP

Hydraulic Circuits

Open loop circuit,

Closed loop circuit,

Typical features of open loop circuit are:

Typical features of closed loop circuits are:

1) Suction lines

1) Directional valves

Large diameters, small lengths 2) Directional valves Sizes dependent on flow 3) Filters / coolers

Small sizes for pilot operation 2) Filter / coolers Small openings to flow / small sizes 3) Tank size

Cross – sectional areas / sizes dependent on

Small – determined only by flow of auxiliary pumps

flow

and system flow

4) Tank size Multiple of max. pump flow in litres 5) Pump arrangement Next to or under the tank 6) Drive speeds Limited by amount of suction 7)) Unloading g in the return line via valves

4) Speeds High limits due to anti – cavitation 5) Arrangement / installation position Any 6) Drive Completely reversible through zero position 7)) Support pp of loads Via drive motor 8) Return of braking energy

by winni

BOMAG FAYAT GROUP

Hydraulic Circuits

Pumps supply the quantity of liquid only Pressure ist build up by restrictions Restrictions are: motors, cylinders etc.

by winni

BOMAG FAYAT GROUP

TRAINING

open loop circuit

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Open loop circuit Basic system with hydraulik pump and motor. single direction working line Pressure relief valve for protection against overload

Fixed displacement pump

Fixed displacement motor

Hydraulic oil filter

H d li oilil cooler Hydraulic l

Hydraulic oil tank

by winni

motor case flow

suction flow w

pu ump case flow w

return flow to tank

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload

Fixed displacement pump

Fixed displacement motor

Hydraulic oil filter

H d li oilil cooler Hydraulic l

Hydraulic oil tank

suction flow by winni

case flow / leakage

high pressure

motor case flow

suction flow w

pu ump case flow w

return flow to tank

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload

Fixed displacement pump

Fixed displacement motor

Hydraulic oil filter

H d li oilil cooler Hydraulic l

Hydraulic oil tank

suction flow by winni

case flow / leakage

high pressure

motor case flow

suction flow w

pu ump case flow w

return flow to tank

BOMAG FAYAT GROUP

TRAINING

closed loop circuit

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

7

8

4

6

Q max

Q max

3

Q min 0

5 2

Q max

10 4 11

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

Diesel engine is running – pump is in neutral position

case flow / leakage high pressure

A

8

7 4 Q max

Q max

6

3

Q min

0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

pump is in Q max. position, oil flow out side A

case flow / leakage high pressure

A

8

7 4 Q max

Q max

3

6 0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

pump is in Q max. position, oil flow out side A

case flow / leakage high pressure

A

8

7 4 Q max

Q max

3

6 0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

Diesel engine is running – pump is in neutral position

case flow / leakage high pressure

A

8

7 4 Q max

Q max

6

3

Q min

0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

pump is in Q max. position, oil flow out side B

case flow / leakage high pressure

A

8

7 4 Q max

3

6

Q min

0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

pump is in Q max. position, oil flow out side B

case flow / leakage high pressure

A

8

7 4 Q max

3

6

Q min

0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG

THE WAY TO THE COMPLETE HYDRAULIC SYSTEM

FAYAT GROUP

Closed loop circuit

12

suction flow charge h pressure

Diesel engine is running – pump is in neutral position

case flow / leakage high pressure

A

8

7 4 Q max

Q max

6

3

Q min

0

5

2

Q max

10 4

B

11

suction flow

7

4) P Pressure relief li f valve l ffor protection t ti against i t overload 5) Charge pump

9 1) Hydraulic oil tank 1

2) Variable displacement pump 3) Variable displacement motor

6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control

by winni

BOMAG FAYAT GROUP

TRAINING

Hydraulic Circuits Pump control by solenoid valve

by winni

BOMAG

Pump control by solenoid valve

FAYAT GROUP

to or from motor

b

a solenoid valve se ervo control piston

A

B

to or from motor

by winni

BOMAG

Pump control by solenoid valve

FAYAT GROUP

to or from motor

b

a solenoid valve se ervo control piston

A

B

to or from motor

by winni

suction flow

control pressure

charge pressure

case flow / leakage

high pressure

BOMAG

Pump control by solenoid valve

FAYAT GROUP

to motor

b

a solenoid valve

se ervo control piston

A

B

from motor

by winni

suction flow

control pressure

charge pressure

case flow / leakage

high pressure

BOMAG

Pump control by solenoid valve

FAYAT GROUP

to or from motor

b

a solenoid valve se ervo control piston

A

B

to or from motor

by winni

suction flow

control pressure

charge pressure

case flow / leakage

high pressure

BOMAG

Pump control by solenoid valve

FAYAT GROUP

from motor

b

a solenoid valve se ervo control piston

A

B

to motor

by winni

suction flow

control pressure

charge pressure

case flow / leakage

high pressure

BOMAG

Pump control by solenoid valve

FAYAT GROUP

to or from motor

b

a solenoid valve se ervo control piston

A

B

to or from motor

by winni

suction flow

control pressure

charge pressure

case flow / leakage

high pressure

BOMAG FAYAT GROUP

Thank you very much for your attention.

by winni