HPR Open Loop Pumps Data and Specifications · 1 HPR Open Loop Pumps Data and Specifications HPR 55...

1

HPR Open Loop PumpsData and Specifications

HPR 55

55 3.36

26,000

9.0

7.9

9.2

75.0

107.0

cm3/rev in3/rev

Pressure Ratings

Rated Speed Max Disp

Rated Speed Min Disp

Envelope Size: Length

Width

Height

Weight

HP Rating Count

HPR 75

75 4.57

26,000

9.8

7.9

9.2

76.0

110.0

HPR 105

105 6.40

23,000

11.0

8.2

9.9

110.0

135.0

HPR 135

135 8.23

23,000

11.9

10.1

10.6

128.0

163.0

HPR 105D

105D 12.8

23,000

14.1

9.6

11.20

194.0

257.0

Nominal 5000 PSIG Maximum 6090 PSIG Peak 7250 PSIG

Contact Factory

Specifications

HPR 75 Open Loop PumpWith Load Sensing and Summated Power Control Circuit

Circuit Diagram

Not component parts of HPR 02 :

External connection line

Variable throttle ( control valve )

5

1

External connection lineLoad-sensing line

2

EXPLANATIONSP Discharge portT Suction portPZ Pressure port, gear pumpLS Load sensing connectionMP Gauge port, pump pressureX Gauge port, actuating pressureL/U Drain (filling, vent) ports Port enabling case to be filled with oilGP Gear pump, pressure portGS Gear pump, suction port

HPR 75 Open Loop PumpWith Load Sensing and Summated Power Control

3

Summated power control

The power summation feature is part of the control. It limits the flow of the swash plate pump in such a way that, depending on the working pressure,the power intake of the swash plate pump remains constant.A second area on the high pressure sensing piston accounts for the power of an additional working circuit.

Functional Description

The HPR 75 - 02 R TL E models are self-priming swash plate type axial piston pumps with a variable displacement volume for open loops.

The controller of the HPR pump is a combination of two types of controls:- load-sensing control- summated power control.

Load-sensing control

The load-sensing control of the HPR pump controls the displacement starting from a zero pump flow condition. If no flow is demanded, only the “stand-by” pressure required by the system is maintained by the pump. When the main control valves are actuated, the load-sensing controller of the HPR automatically matches the displacement and the flow to the “flow demand” required by the control valves, up to the maximum available pump flow. The pump pressure is only approx-imately 20 bar higher than the (highest) pressure of the active loads. Thus, the load-sensing control system is a “flow on demand” control, which matches the pump output flow to the variable metering orifice size by keeping a constant ∆p across the measuring orifice of the directional control valve.

4


Pump pressures P and PZ act on two sensing areas of the summated power control (6). Aslong as the resulting force is smaller than the preloaded spring force (7), the signal generatedby the LS control is directly related to the large area of the control piston. If this force becomesstronger than the spring preload, the summated power regulator overrides the shiftingsignal generated by the LS control and connects pump pressure to the large piston area.This leads to reducing the pump swash angle.A stroke feedback (8) informs the summated power control of the swash angle change at the detector spring, until equilibrium is achieved between the spring force and hydraulic force P+PZ.When pressure is relieved, this procedure performs the opposite way.

Technical description: summated power control

When there is no function activated and when the control spool (1) is in the neutral position (see circuit diagram), then the pump (2) delivers only such a quantity of oil that the pressurein the pump line (3), which acts on the load-sensing controller (4) (LS), maintains the spring on the opposite side of the control spool and the swivel spring (on the displacement piston Vmin) in balance. Every change in pressure P and LS makes the LS spool move and leadsto an immediate change of pump displacement. Upon actuation of the control spool (1), the connection from the pump output (2) to the load port is opened. Essentially, the area which is opened represents a metering orifice.If oil is to flow continuously through this orifice, independent of the load pressure, then the pressure difference at this point must be kept constant. If the controlspool (1) is opened, the pump pressure proceeds up to this function. At the same time, theload pressure acts upon the spring side of the LS spool (4), through the LS line (5), causingthe pump (2) to go on stroke and the pressure in the P line (3) to increase.If the pump pressure exceeds the load pressure, the load starts moving and the following oil flow produces a drop in pressure across the control edge (metering orifice). Balance isachieved when this drop in pressure corresponds to the spring preload of the LS con-troller (4).The pump (2) reacts to each control spool movement, fully stabilizing each variationof the metering orifice and maintaining a constant pressure difference.

Technical description: load-sensing control

Technical Description

5


1

4

5

7

2 3 6

Basic Design of Rotating Group

1 Shaft2 Piston assembly3 Cylinder barrel4 Control5 Swash plate6 Port plate7 Gear pump

EXPLANATIONS

6

HPR - 02 Open Loop PumpWith Load Sensing and Electric Pressure Control

Solenoid switching operations

M d.c. proportional solenoid

12/24 V, according to specification

P

UT

LS

L

X1

LS

X

0 max

A

M

4

3

2

76

8

Not component parts of HPR 02 :

External connection line


5

1

External connection lineLoad-sensing line 5

Variable orifice(Control valve)

p

1

EXPLANATIONS

P

T

L U

LS

X

Discharge port SAE

Suction port SAE

Drain (filling, vent) portsPort enabling case to be filled with oil

X1

Gauge port, actuating pressure M14 x 1.5

Control pressure port for emergency operation (max. 30 bar) M14x1.5

Load-sensing connection 2x M14 x 1.5

Gauge port, control pressure M14 x 1.5A

Circuit Diagram


RV

1

10

2

3

4 5

6

3

7

8

9

12 11

1314

load sensing control line

P - line to the actuators

7

1 Check valve2 Proportional solenoid3 Set screw control pressure4 Gauge port A5 Control pressure port for emergency operation X16 Pilot spool (el. pressure control valve)7 Set screw ∆p = Pp - LSp 8 Pilot spool load sensing control9 Gauge port X10 Gauge port LS11 Actuator piston Vmax12 Actuator piston Vmin13 Swash plate14 Swivel spring

EXPLANATIONS

Basic Design of Control System

8


Electrical pressure control valve

The pressure control valve is actuated via a proportional solenoid andreduces the internally provided pump pressure in relation to the applied current.This pressure signal changes the set pressure ∆p (reduction of the stroke volume) by means of an additional metering area on the LS control spool.With additional components, such as the Linde CEB electronic controller, the pressure controlvalve can be used for anti-stall control as well as for mode controls.

The HPR - 02 R E1 L models are self-priming swash plate type axial piston pumps with a variable displacement volume for open loops.

The controller of the HPR pump is a combination of two types of controls:- load-sensing control- electrical pressure control valve.

Load-sensing controller

The principle of the load-sensing control of the HPR pump is as follows: it controls the displacement starting from a zero pump flow condition. If no flow is demanded, only the “stand-by” pressure required by the system is maintained by the pump. When the main control valves are actuated, the load-sensing controller of the HPR automatically matches the displacement and the flow to the “flow on demand” required by the control valves, up to the maximum available pump flow. The pump pressure is only approximately20 bar higher than the (highest) pressure of the active loads. Thus, the load-sensing control system is a “flow on demand” control, which matches the pump output flow tothe variable metering orifice size by keeping a constant ∆p across the measuring orifice of the directional control valve.


9


When there is no function activated and when the control spool (1) is in the neutral position (see circuit diagram), then the pump (2) delivers only such a quantity of oil that the pressurein the pump line (3), which acts on the load-sensing controller (4) (LS), maintains the spring on the opposite side of the control spool and the swivel spring (on the displacement piston Vmin) in balance. Every change in pressure P and LS makes the LS spool move and leadsto an immediate change of pump displacement. Upon actuation of the control spool (1), the connection from the pump output (2) to the load port is opened. Essentially, the area which is opened represents a metering orifice.If oil is to flow continuously through this orifice, independent of the load pressure, then the pressure difference at this point must be kept constant. If the controlspool (1) is opened, the pump pressure proceeds up to this function. At the same time, theload pressure acts upon the spring side of the LS spool (4), through the LS line (5), causingthe pump (2) to go on stroke and the pressure in the P line (3) to increase.If the pump pressure exceeds the load pressure, the load starts moving and the following oil flow produces a drop in pressure across the control edge (metering orifice). Balance isachieved when this drop in pressure corresponds to the spring preload of the LS con-troller (4).The pump (2) reacts to each control spool movement, fully stabilizing each variation of the metering orifice and maintaining a constant pressure difference.

Technical description: load-sensing controller

When the solenoid (6) is in the de-energized state, the pilot spool of the pressure control valve (7) is in the position in which the connection channel (3) (pump pressure) to thechannel (8) (metering area on LS pilot) is blocked. The channel (8) is released to the tank(interior of HPR pump housing). If a predetermined current exists in the solenoid (6), then the solenoid pin moves the pilot spool of the pressure control valve (7) to the position in which the channels (3) and (8) are connected. Solenoid force “Fm” is then converted into hydraulic force “Fh” proportionally in relation to the level of the applied current. This signal (control pressure) causes the set pressure difference ∆p to be reduced by means of an additional metering area on the LS control spool (4).Result: A reduction of the displacement of the HPR pump.

Technical description: electrical pressure control valve


10


1

2 3

54

67

8

1 Shaft2 Piston assembly

3 Cylinder barrel

4 Control

5 Proportional solenoid

6 Swash plate

7 Port plate

8 PTO

EXPLANATIONS

Rotating Group

11

HPR105D - 02 Open Loop PumpWith Load Sensing and Electric Pressure Control

Solenoid switching operationsM d.c. proportional solenoid12/24 V, according to specification

external connection line

load-sensing line 5

Circuit Diagram

Not component parts of HPR 105D - 02:

external connection lines


5 9

1

p

4

3

2

76

8

measuring orificein the valve

1

A

0 max

M

1000max

100

GP

GS

to the actuators

2

3

9 9

X

T

P1 P2

L2L1

U1 U2

LS1

LS2

X1

19

EXPLANATIONS

Control pressure port for emergency operation(max. 30 bar) M14x1.5

T Suction port, SAEX1

Gauge port, control pressure M14 x 1.5A

Discharge port pump, SAE P1, P2

Load-sensing connection 2x M14 x 1.5LS1, LS2

Drain (filling, vent) ports Port enabling case to be filed with oil.

Gauge port, actuating pressure M14 x 1.5

Discharge port auxiliary pump

X

L1, L2

U1, U2

GP

GS Suction port auxiliary pump

Drain (filling, vent) ports Port enabling case to be filed with oil.

12


Electrical pressure control valve

The pressure control valve is actuated via a proportional solenoid andreduces the internally provided pump pressure in relation to the applied current.This pressure signal changes the set pressure ∆p (reduction of the stroke volume) by means of an additional metering area on the LS control spool.With additional components, such as the Linde CEB electronic controller, the pressure controlvalve can be used for anti-stall control as well as for mode controls.

The HPR 105D - 02 R E1 L models are self-priming swash plate type axial piston pumps with a variable displacement volume for open loops.

The controller of the HPR pump is a combination of two types of controls:- load-sensing control- electrical pressure control valve.

Load-sensing controller

The principle of the load-sensing control of the HPR pump is as follows: it controls the displacement starting from a zero pump flow condition. If no flow is demanded, only the “stand-by” pressure required by the system is maintained by the pump. When the main control valves are actuated, the load-sensing controller of the HPR automatically matches the displacement and the flow to the “flow on demand” required by the control valves, up to the maximum available pump flow. The pump pressure is only approximately 20 bar higher than the (highest) pressure of the active loads. Thus, the load-sensing control system is a “flow on demand” control, which matches the pump output flow to the variable metering orifice size by keeping a constant ∆p across the measuring orifice of the directional control valve.


13


When there is no function activated and when the control spool (1) is in the neutral position (see circuit diagram), then the pump (2) delivers only such a quantity of oil that the pressurein the pump line (3), which acts on the load-sensing controller (4) (LS), maintains the spring on the opposite side of the control spool and the swivel spring (on the displacement piston Vmin) in balance. Every change in pressure P and LS makes the LS spool move and leadsto an immediate change of pump displacement. Upon actuation of the control spool (1) the connection from the pump output (2) to the load port is opened. Essentially, the area which is opened represents a metering orifice.If oil is to flow continuously through this orifice, independent of the load pressure, then the pressure difference at this point must be kept constant. If the controlspool (1) is opened, the pump pressure proceeds up to this function. At the same time, theload pressure acts upon the spring side of the LS spool (4), through the LS line (5), causingthe pump (2) to go on stroke and the pressure in the P line (3) to increase.If the pump pressure exceeds the load pressure, the load starts moving and the following oil flow produces a drop in pressure across the control edge (metering orifice). Balance isachieved when this drop in pressure corresponds to the spring preload of the LS con-troller (4).The pump (2) reacts to each control spool movement, fully stabilizing each variation of the metering orifice and maintaining a constant pressure difference.

Technical description: load-sensing controller

When the solenoid (2) is in the de-energized state, the pilot spool of the pressure control valve (7) is in the position in which the connection channel (3) (pump pressure) to thechannel (8) (metering area on LS pilot) is blocked. The channel (8) is released to the tank(interior of HPR pump housing). If a predetermined current exists in the solenoid (2), then the solenoid pin moves the pilot spool of the pressure control valve (7) to the position in which the channels (3) and (8) are connected. Solenoid force “Fm” is then converted into hydraulic force “Fh” proportionally in relation to the level of the applied current. This signal (control pressure) causes the set pressure difference ∆p to be reduced by means of anadditional metering area on the LS control spool (4).Result: A reduction of the displacement of the HPR pump.

Technical description: electrical pressure control valve


14


Basic Rotating Group

1

2

2

3

3

4

4

5

6

6

7 8

1 Shaft2 Piston assembly

3 Cylinder barrel

4 Port plate5 Gear pump

6 Swash plate

7 Clutch

8 Port plate housing

EXPLANATIONS

HPR Open Loop Pumps Data and Specifications · 1 HPR Open Loop Pumps Data and Specifications HPR 55...

Documents

Transcript of HPR Open Loop Pumps Data and Specifications · 1 HPR Open Loop Pumps Data and Specifications HPR 55...