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BOSCH REXROTH
PGP2-2X/008RJ20VU2
R900984019
All Other Products

Gear pumps: PGP2.-2x/

$1,573.00

BOSCH REXROTH

MATERIAL:  R900984019

SUMMARY:  Gear pumps: PGP2.-2x/

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technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Design

PGP hydraulic pumps are leak-gap-compensated internal gear pumps with a fixed displacement.

They consist basically of: housing (1), bearing cover (1.1), cover (1.2), ring gear (2), pinion shaft (3), slide bearings (4), axial discs (5) and stop pin (6) as well as the segment assembly (7) which is composed of a segment (7.1), segment carrier (7.2) and the sealing rolls (7.3).

Suction and displacement process

The hydrodynamically supported pinion shaft (3) drives the internally toothed ring gear (2) in the direction of rotation shown.

During rotation, the volume is increased in the suction area over an angle of approx. 180°. A negative pressure is generated and fluid flows into the chambers.

The sickle-shaped segment assembly (7) separates the suction chamber from the pressure chamber. Within the pressure chamber, the teeth of the pinion shaft (3) mesh with the tooth spaces of the ring gear (2). The fluid is then displaced through the pressure channel (P).

Axial compensation

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

The axial compensation force FA acts in the area of the pressure chamber and is generated by the pressure zone (8) in the axial discs (5). The axial, longitudinal gaps between rotating and fixed parts are therefore extremely small and ensure optimum axial sealing of the pressure chamber.

Radial compensation

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

The radial compensation force FR acts on the segment (7.1) and segment carrier (7.2).

The area ratios and the position of the sealing rolls (7.3) between the segment and segment carrier are designed to provide virtually gap-free sealing between the ring gear (2), the segment assembly (7) and the pinion shaft (3).

Spring elements under the sealing rolls (7.3) ensure adequate contact pressure, even at very low pressures.

Hydrodynamic and hydrostatic bearing

The forces acting on the pinion shaft (3) are absorbed by hydrodynamically lubricated radial slide bearings (4) while those acting on the ring gear (2) are absorbed by the hydrostatic bearing (9).

Splines

Involute splining was selected for the gear. Their long length of contact results in a low flow and pressure pulsation; these low pulsation rates contribute greatly to the low-noise operation.

Used materials

Housing (1), bearing cover (1.1), cover (1.2) and axial discs (5): Steel-aluminum compound material

Ring gear (2), pinion shaft (3) and stop pin (6): Steel

Slide bearing (4): Copper-tin with steel back

Segment (7.1) and segment carrier (7.2): Brass alloy

Sealing rolls (7.3): Plastic

01

02

03

04

05

06

07

08

09

10

11

12

PG

P

/

R

V

*

Type

01

Internal gear pump, fixed displacement, gap-compensated

PG

Series

02

High-pressure pump, maximum pressure 350 bar

P

Frame size BG

03

BG2

2

BG3

3

Series

BG2

BG3

04

Series 20 to 29 (20 to 29: unchanged installation and connection dimensions)

-

2X

Series 30 to 39 (30 to 39: unchanged installation and connection dimensions)

-

3X

Size

NG

05

BG2

6.3

006

8.0

008

11.0

011

13.0

013

16.0

016

BG3

20.0

020

25.0

025

32.0

032

Direction of rotation

06

When looking at the drive shaft

right

R

Drive shaft

07

Cylindrical shaft with fitting key, ISO 3019-2 with through-drive

E

Splined shaft SAE J744 with involute tooth system according to ANSI B92.1a

J

Line connections

08

Suction and pressure port according to SAE J518

07

Square flange connection, metric mounting thread

20

Seal material

09

FKM (fluor-caoutchouc)

V

Mounting flange

10

4-hole mounting flange according to ISO 3019-2 and VDMA 24560 part 1

E4

2-hole mounting flange according to ISO 3019-1

U2

Option

11

End cover for attachment of the next smaller frame size

K

12

Further details in the plain text

*

Not all of the variants according to the ordering code are possible! Please select the desired pump with the help of the selection table (see dimensions) or after consultation with Bosch Rexroth!

Special options are available on request, e.g., integrated pressure-relief valves.

Multiple pump units

01

02

03

04

05

06

07

08

09

10

P2

PGP

/

+

PGF

/

R

+

Type

01

2-fold

P2

02

Series of the first pump

PGP

03

Size of the first pump

​1)

04

Series of the second pump

PGF

05

Size of the second pump

2)

Direction of rotation

06

Viewed on drive shaft

clockwise

R

Drive shaft of the first pump

07

Parallel keyed shaft, ISO 3019-2 with through drive

E

Splined shaft SAE J744 with involute tooth system according to ANSI B92.1a

J

Wire connections of the first pump

08

Suction and pressure port according to SAE J518

07

Square flange port according to DIN 3901 and DIN 3902, metric fastening thread

20

Line connection of the 2nd pump

09

Suction and pressure port according to SAE J518

07

Square flange port according to DIN 3901 and DIN 3902, metric fastening thread

20

Mounting flange of the first pump

10

4-hole mounting flange according to ISO 3019-2 and VDMA 24560 part 1

E4

2-hole mounting flange according to ISO 3019-1

U2

1) PGP see type code
2) PGF see data sheet 10213

Frame size

2 3

Size

     

6.3 8 11 13 16 20 25 32

Displacement

geometric

Vg

cm³

6.5 8.2 11 13.3 16 20.6 25.4 32.5

Input speed

nmin

rpm

600

nmax

rpm

1800

Operating pressure, absolute

Inlet

p

bar

0.8 ... 2

Outlet

continuous

pN

bar

250

intermittent

Maximum 1 s, up to 10 % of duty cycle, maximum 1 x 106 load cycles 1)

pmax

bar

350

Maximum 6 s, up to 15 % of duty cycle, maximum 10 x 106 load cycles 1)

pmax

bar

315

Flow 2)

qV

l/min

9.4 11.9 16 19.3 23.2 29.9 36.8 47.1

Power consumption

Minimum drive power required 3)

pzu

kW

0.75 1.1 1.5

Weight

m

kg

3 3.1 3.3 3.5 3.6 4.3 5.1 5.5

Shaft loading

Radial and axial forces (e.g., belt pulley) only after consultation

Type of mounting

Flange mounting
1) Attention! This value must not be exceeded even by a pressure peak.
2) at n = 1450 rpm, p = 10 bar, v = 30 mm2/s
3) at p ≈ 1 bar

Hydraulic fluid

Permissible hydraulic fluid 1)

HL mineral oil according to DIN 51524 part 1/HLP, mineral oil according to DIN 51524 part 2
HEES fluids according to DIN ISO 15380
HEPR fluids according to DIN ISO 15380

Operating temperature range

°C

-20 … +80

Ambient temperature range

°C

-20 … +60

Viscosity range

mm²/s

10 … 300

Permissible starting viscosity

mm²/s

2000

Maximum admissible degree of contamination of the hydraulic fluid 2)

Class 20/18/15 according to ISO 4406 (c)
1) Other hydraulic fluids on request
2) Cleanliness levels specified for the components must be maintained in the hydraulic systems. Effective filtration prevents malfunctions and simultaneously extends the service life of the components.

Note

Please contact us if the unit is to be used outside the specified values. Observe our specifications according to data sheet 90220.

Frame size 2

Flow

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Efficiency

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Drive power

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Sound pressure level

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Frame size 3

Flow

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Efficiency

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Drive power

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Sound pressure level

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Note

Characteristics measured at n = 1450 rpm; ν = 46 mm2/s; θ = 40 °C

Sound pressure level measured in acoustic room according to DIN 45635, Sheet 26; Distance: microphone ‒ pump = 1 m

Symbol

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Frame size 2

Parallel keyed shaft, DIN 6885, with through drive

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

1

Shaft key B6 × 6 × 25

Type

a

c

d

S 1) 2)

P 2) 3)

mm

mm

mm

mm

mm

PGP2-2X/006RE20VE4 63 115.2 104.1 Ø20, TK Ø40 Ø6, TK Ø35
PGP2-2X/008RE20VE4 64.8 118.7 107.6 Ø8, TK Ø35
PGP2-2X/011RE20VE4 67.5 124.2 113.1 Ø12, TK Ø35
PGP2-2X/013RE20VE4 70 129.2 118.1
PGP2-2X/016RE20VE4 72.5 134.2 123.1
1) Fastening thread M6; 10 deep
2) See line connections
3) Fastening thread M6; 12 deep

Splined shaft, with through-drive

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

1

SAE J744 16-4(A) 9T 16/32 DP
Involute splining according to ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 5

Type

a

c

d

S 1) 2)

P 2) 3)

mm

mm

mm

mm

mm

PGP2-2X/006RJ20VU2 65 117.2 106.1 Ø20, TK Ø40 Ø6, TK Ø35
PGP2-2X/008RJ20VU2 66.8 120.7 109.6 Ø8, TK Ø35
PGP2-2X/011RJ20VU2 69.5 126.2 115.1 Ø12, TK Ø35
PGP2-2X/013RJ20VU2 72 131.2 120.1
PGP2-2X/016RJ20VU2 74.5 136.2 125.1
1) Fastening thread M6; 10 deep
2) See line connections
3) Fastening thread M6; 12 deep

TK = Pitch circle

Frame size 3

Parallel keyed shaft, DIN 6885, with through drive

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

1

Shaft key B8 × 7 × 30

Type

a

c

d

S 2)

P 2)

mm

mm

mm

mm

mm

PGP3-3X/020RE20VE4 71 137.1 126 Ø26, TK Ø55 1) Ø12, TK Ø35 4)
PGP3-3X/025RE20VE4 74 143.1 132
PGP3-3X/032RE07VE4 78.5 152.1 141 SAE 1 1/4 in S 3) SAE 3/4 in S 3)
1) Fastening thread M8; 12 deep
2) See line connections
3) Standard pressure series
4) Fastening thread M6; 12 deep

Splined shaft, with through-drive

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

1

SAE J744 22-4(B) 13T 16/32 DP
Involute splining according to ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 5

Type

a

c

d

S 2)

P 2)

mm

mm

mm

mm

mm

PGP3-3X/020RJ20VU2 79.5 145.6 134.5 Ø26, TK Ø55 1) Ø12, TK Ø35 4)
PGP3-3X/025RJ20VU2 82.5 151.6 140.5
PGP3-3X/032RJ07VU2 92 160.6 149.5 SAE 1 1/4 in S 3) SAE 3/4 in S 3)
1) Fastening thread M8; 12 deep
2) See line connections
3) Standard pressure series
4) Fastening thread M6; 12 deep

TK = Pitch circle

Line connections

Port type 20 square flange port

Suction port S

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Pressure port P

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Size

Pitch circle

G

t

e

f

M

mm

mm

mm

mm

Nm

6.3 40 M6 10 6 20 10
8 8
11 12
13
16
20 55 M8 12 26 25
25
32 - - - - - -

Port type 07, SAE flange port, for Size 32

Suction port S SAE 1 1/4 in

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Pressure port P SAE 3/4 in

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Intended use

Internal gear pumps are intended for the assembly of hydraulic drive systems in machine and system construction.

Technical data

The system or machine manufacturer must ensure compliance with the permissible technical data and operating conditions. The pump itself does not contain a device to prevent operation outside the permissible data. It is possible to operate the pump outside of the permissible technical data to a certain extent; the express written consent from Bosch Rexroth is, however, required.

All specified technical performance features are median values and apply with the specified general conditions. In case of modifications to the general conditions (e.g., viscosity), the technical data may change as well. Scatter corresponding to the relevant state of technology is possible.

Hydraulic project planning

Air bleeding option for commissioning

For Rexroth PGP2-2X internal gear pumps, a manual or switchable air bleeding option for the initial commissioning or any recommissioning after maintenance and repair work is to be provided. The air bleeding point is to be set in the pressure line before the first valve or check valve. Air bleeding may be performed with a maximum counter pressure of 0,2 bar.

Examples of air bleeding circuits

Switchable bleeding

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Manually operated bleeding

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Suction line

The line cross sections are to be dimensioned for the specified flows such that an ideal suction speed of 0.6 to 1.2 m/s is achieved on average. The suction speed should not exceed a maximum value of 2 m/s.

The suction cross sections at the pump itself are designed for the maximum flow and therefore serve only as reference. In case of continuous operation at rotational speeds lower than the permissible maximum speed, the suction tube diameter is also to be dimensioned smaller than the suction port of the pump depending on the actual suction speed.

Overall, the suction line is to be designed so that the permissible inlet operating pressure is maintained. Bends and a combination of suction pipes from several pumps are to be avoided. If the use of a suction filter is unavoidable, it must be ensured on the system side that the lowest permissible inlet operating pressure is not exceeded even if the filter is contaminated.

Ensure the air tightness of the transitions and the pressure resistance of the suction hose with respect to the external air pressure.

The immersion depth of the suction pipe should be selected as large as possible (at least 100 mm at the lowest fluid level). Depending on the internal reservoir pressure, the viscosity of the operating medium and the flow conditions within the reservoir, no vortex may form even at maximum flow. There is otherwise a risk of air being drawn in. Return fluid and case drain fluid must not be immediately be drawn in again.

Dimensions in mm

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Pressure line

Sufficient burst resistance of the pipes, hoses and connecting elements must be ensured for pressure lines. The cross sections should be based on the maximum flow in order to avoid additional excessive loading of the pump due to back-pressure. Here, you must also take into account the pipe losses over the entire pressure line length and other line resistances (e.g., bends, pressure filters).

Pressure safeguarding

The PGP internal gear pump does not include any devices for adherence to the maximum operating pressure. The setting and safeguarding of the permissible operating pressure must be ensured on the system side.

The pressure-relief valves necessary for this purpose are to be designed with consideration given to the maximum flow and the rate of pressure increase that will occur such that the permissible intermittent operating pressure is not exceeded.

Pressure holding function

In the variable-speed drive, the pump can also be temporarily operated in the pressure holding function below the specified minimum rotational speed. The holding time and the rotational speed necessary for this purpose are a function of the operating viscosity and the pressure level. For the design, please contact Bosch Rexroth‘s technical sales department.

In the deactivated state (rotational speed = 0), a leakage flow flows through the pump back into the reservoir, depending on the load pressure. If this is to be prevented, a check valve is to be used.

When using a check valve, please observe the note on the air bleeding option for commissioning.

Mechanical project planning

Mounting

On the machine side, the screws are to be accessible in such a way that the required tightening torque can be applied. The screw tightening torque is oriented towards the operating conditions and elements involved in the screw connection and is to be specified by the manufacturer during project planning of the power unit, the machine, or the system.

 

Reservoir

When designing the reservoir or selecting a suitable standard reservoir, the following requirements are to be observed:

Select the largest possible reservoir volume, depending on the continuous or average flow, which is needed in order to allow separation of air bubbles by means of sufficient dwell time of the medium in the reservoir. The air separation ability of the used hydraulic fluid is also of importance here. Provide settling zones for the hydraulic fluid in the reservoir in order to allow for air separation. Provide guiding plates in order to allow contamination at the reservoir bottom to be deposited outside the pump suction area. Generously dimension the reservoir surfaces depending on the heat output to be dissipated via the reservoir walls.

 

Required power unit functions

At a minimum, the hydraulic power units should be equipped with the following features:

Reservoirs that are designed so that the internal pressure corresponds to the ambient pressure should be equipped with ventilation filters for pressure compensation purposes. The hydraulic fluid should only be filled using filling nozzles that eliminate the possibility of filling with unfiltered fluid. The ingress of contamination or moisture must be avoided. If used in highly contaminated environments, the reservoir must, for this purpose, be precharged by means of air pressure. If cleaning of the reservoir exterior is planned or anticipated during the period of use, reservoir bushings for pipes, lines, or hoses are to be selected so that a secure seal is ensured against external pressurization with a water jet.

 

Place of installation and ambient conditions

With places of installation at a geodetic height of more than 1000 m, the pump is to be arranged in or below the reservoir or the reservoir is to be precharged by means of compressed air in order to ensure the permissible minimum inlet pressure. A short suction line with large cross section is to be selected; bends should not be used.

When installing the pump more than 10 m below the reservoir, the reduction of the inlet pressure to the maximum permissible value must be ensured by means of additional measures.

If operating the pump in salt-containing or corrosive environments or if there is a possibility of pressurization with strongly abrasive substances, it must be ensured on the system side that the shaft seal ring and the sealing area of the shaft do not make direct contact with the environment.

 

Drive

Electric motor + pump support + coupling + pump

No radial or axial forces permissible on the pump drive shaft! Motor and pump must be exactly aligned! Always use a coupling that is suitable for compensating for shaft offsets!

Installation positions

B3

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

B5

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

V1

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Pump combinations

With pump combinations, make sure that the operating data approved for the pump type concerned can be complied with in every step. Combined pumps must all have the same direction of rotation. The pump with the highest torque, variable pumps or pumps with intermittent pressure loading should be specified as the first step in the pump combination. The engineer must verify the maximum through-drive torque for every application. This also applies for existing (coded) pump combinations. The sum of all input torques in a pump combination may not exceed the permissible input torque of the first pump.

Maximum input torques

Shaft version E

140 Nm

Shaft version J

90 Nm

Formula for input torque

technical illustration-PGP2-2X/008RJ20VU2-Gear pumps: PGP2.-2x/

Key

T​

Input torque [Nm]

Δp

Operating pressure [bar]

V

Displacement [cm³]

η

Hydraulic-mechanical efficiency

Maximum output torques

Shaft version E

70 Nm

Shaft version J

70 Nm

Common suction is not possible. For reasons of strength and stability, we recommend using ISO 4-hole mounting flanges according to VDMA “E4” for combinations of three or more pumps. Before operating pump combinations with different media, please consult Bosch Rexroth. PGF combinations are installed without combination parts and are not sealed against each other.

Selection

The front pump must have shaft version E or J. The middle pump must have shaft version L. The rear pump must have shaft version N. If a pump of the next smaller frame size is to be mounted, the designation of the first pump must end with “K” (e.g., PGP3 + PGF2 ⇒ front pump: PGP3-3X/032RE07VE4K)

Dimensions

The dimensions of the ports are the same as for single pumps (see dimensions). The total length of the pump combination is calculated by adding up dimensions “d” of the single pumps (see dimensions). With the combination of PGP2 and PGF1, the installation length of the PGP2 (dimension d) increases by 4.5 mm.

Maintenance schedule and operational safety

For safe operation and a long service life of the pump, a maintenance schedule must be prepared for the power unit, the machine, or the system. The maintenance schedule must ensure that the specified or permissible operating conditions of the pump are complied with over the entire period of use.

In particular, compliance with the following operating parameters is to be ensured:

The required oil cleanliness The operating temperature range The filling level of the operating medium

Furthermore, the pump and the system are to be checked for changes to the following parameters on a regular basis:

Vibrations Noise Temperature difference between pump – fluid in the reservoir Foaming in the reservoir Leak-proofness

Changes to these parameters indicate component wear (e.g., diesel engine, coupling, pump, etc.). The reason is to be determined and remedied immediately.

In order to achieve high operational safety of the pump in the machine or system, we recommend checking the aforementioned parameters continuously and automatically and the automatic shut-down in case of changes exceeding the usual fluctuations in the specified operating range.

Plastic components of drive couplings should be replaced regularly, though after no more than 5 years. The corresponding manufacturer’s specifications are paramount.

For preventive maintenance of the pump, we recommend having the seals replaced after an operating period of no more than 5 years by an authorized Bosch Rexroth service company.

Pump safety block

For limiting the operating pressure and for the pump circulation at zero pressure, we recommend our pump safety blocks of type DBA... according to data sheet 25890.

Automatic air bleeding during commissioning is, however, not possible via DBA blocks. In this case, we recommend separate, manual air bleeding.