The shhark® Low Noise Technology.......................................................................................................................................... 4
Features and Benefits......................................................................................................................................................................5
Determination of Nominal Pump Sizes....................................................................................................................................8
Master Model Code
Model Code for Single Gear Pumps........................................................................................................................................ 11
Model Code for Tandem Gear Pumps.................................................................................................................................... 12
Model Code for Tandem Gear Pumps.................................................................................................................................... 14
Temperature and viscosity......................................................................................................................................................... 17
Selecting a filter.........................................................................................................................................................................19
Line sizing......................................................................................................................................................................................... 19
Performance Graphs for Frame Size 8,0 and 011................................................................................................................23
Performance Graphs for Frame Size 014 and 017..............................................................................................................23
Performance Graphs for Frame Size 019, 022 and 025.....................................................................................................24
Product Options
Standard Flange, Shaft and Ports Configuration Overview............................................................................................25
Pumps with integral relief valve • internally and externally drained...........................................................................27
Integral relief valve covers E10 or I10..................................................................................................................................... 28
Model Codes for Integral Relief Valve.....................................................................................................................................29
Dimensions and Data
SHP2 with E10-T80 flange-drive gear combination.......................................................................................................... 30
SHP2 with B10-T50 flange-drive gear combination..........................................................................................................31
SHP2 with D10-I10 flange-drive gear combination...........................................................................................................32
SHP2 with B20/B22 - T50 flange-drive gear combination...............................................................................................33
SHP2 with SA1 - S09/S11/PS1 flange-drive gear combination......................................................................................34
The standard technology currently used in low noise gear pumps is based on double-flank contact. This
solution reduces the peak-to-peak flow pulsation by 75% compared to a single-flank contact gear pumps
with the same number of teeth.
The Danfoss shhark® achieves the same reduction of flow pulsation, but in a totally different way. As
illustrated below, for the same outer diameter, shhark® gears feature almost twice the number of teeth of
a standard gear pump, thanks to a revolutionary asymmetric tooth profile design. Moreover, the shhark®
teeth are also slightly helical; the small helix angle does not generate any additional radial and axial load
but makes the flow characteristic smoother, further reducing the flow pulsation.
Standard gear pump (11-teeth) versus shhark® (17-teeth) technology
The comparison between the flow characteristic of Danfoss SKP2 (11-teeth) and shhark® (17-teeth) is
illustrated in the plot below: the reduction of peak-to-peak flow pulsation is 78%. In addition, the average
flow per unit width of shhark® is approximately 2.7% higher than SKP2; this means that for the exact same
pump dimensions, shhark® delivers more flow.
Low noise performance guaranteed throughout the whole life of the pump
•
Low vibration, flow pulsation reduced by a stunning 78% compared to a standard gear pump
•
Higher volumetric efficiency than a standard gear pump by 2%
•
Noise emitted at low frequency, resulting in high sound quality
•
Wide range of displacements from 6.18 to 29 cm3/rev
•
Rated pressure up to 250 bar
•
Operating speed up to 4000 rpm
•
SAE, DIN and European standard mounting flanges and shafts
•
Available with integral relief valve
•
Interchangeable with all standard gear pumps
•
Multiple pump configurations, available also in compact configuration
•
Compact and lightweight
•
Internal spline available, which means compactness and availability of big displacements working at
high pressure simultaneously (maximum 120 Nm at the intermediate coupling)
•
Helps to meet legal NVH requirements
•
Innovative solution (Danfoss Patents US 20150330387 (A1) and WO2017064046 (A1)
•
Ideal for hybrid and full electric machines for which the hydraulic pump is the most important source
of noise together with fan drive
•
Cost and space saving due to elimination of end-of-line noise reduction measures
shhark® Gear Pumps Representatives
Many combinations of the gear pumps are available as multiple units made to fit any need.
Advantages of the shhark® technology versus the “dual contact flank” technology
The effectiveness of dual contact flank is very likely to decrease throughout the pump’s life, because
external gear units often work at high pressure with high level of contaminants in the hydraulic fluid.
In such conditions, the critical components of the rotating kit slowly wear out, with a progressive loss of
the double-flank contact condition and with it, the low noise performance.
shhark®pumps are able to keep low noise performance even after thousands of hours of heavy duty
operation in the field and it even slightly improve, due to the tribologic adaptation of components, while
in the same conditions the dual contact flank pump starts emitting noise due to gears wearing. In
addition, shhark® emits noise at lower frequency than the dual contact flank technology, resulting in a
better sound quality.
shhark® Pump Design
In terms of rated operating range (speed, pressure and temperature), overall dimensions and available
configurations, the shhark® has been designed to be essentially a low noise version of SKP2 pump.
The 20 mm shaft can accommodate any type of drive end, such as:
S09 (SAE 9-teeth 16/32)
•
S11 (SAE 11-teeth 16/32)
•
S13 (SAE 13-teeth 16/32)
•
T50 (Taper 1:5)
•
T80 (Taper 1:8)
•
PS1(Parallel SAE Ø15.875)
•
I10 (Tang 8x17.8)
•
As for SKP2, the hydrostatic compensation system is on the bearing blocks to ensure high efficiency,
more compact tandem combinations and higher flexibility to distributors.
The rated and peak pressure mentioned in the table are for pumps with flanged ports only. When
threaded ports are required a de-rated performance has to be considered. To verify the compliance of a
high pressure application with a threaded ports pump apply to a Danfoss representative.
Generally, the sizing process is initiated by an evaluation of the machine system to perform the necessary
work function. The following formulae can be used to determine the nominal pump size for a specific
application.
Metric SystemInch System
Output flow
Input torque
Input power
Variables:
Vg = Displacement per rev.
pHP = High pressure
pNP = Low pressure
∆p = pHP – p
n = Input speed
ηv = Volumetric efficiency
ηm = Mechanical (torque) efficiency
ηt = Overall efficiency (ηv • ηm)
NP
SI units [US units]:
cm3/rev [in3/rev]
bar [psi]
bar [psi]
bar [psi]
min-1 (rpm)
C313.5x30xM6E57/8-14UNF
C513.5x40xM8E611/16-12UN
C720x40xM8F33/8 Gas
MB12 x 38.1 x 17.48 x M8 (=)F41/2 Gas
MC18.5 x 47.63 x 22.23 x M6 (=)F53/4 Gas
MD18.5 x 47.63 x 22.23 x M8 (=)F61 Gas
ME18.5 x 47.63 x 22.23 x M10 (=)H5M18 x 1.5 per ISO6149
MG25/20 x 52.37 x 26.19 x M10 (=)H7M22 x 1.5 per ISO6149
NNWithout outlet port
To be used with rear ported units only.
H8M27 x 2 per ISO6149
H9M33 x 2 per ISO6149
H - Rear cover
P10
I10
E10
Standard cover for pump
Rear cover for pump with relief valve with internal drain
Rear cover for pump with relief valve with external drain 3/8 Gas
C313.5x30xM6E57/8-14UNF
C513.5x40xM8E611/16-12UN
C720x40xM8F33/8 Gas
•••••
MB12 x 38.1 x 17.48 x M8 (=)F41/2 Gas
MC18.5 x 47.63 x 22.23 x M6 (=)F53/4 Gas
MD18.5 x 47.63 x 22.23 x M8 (=)F61 Gas
ME18.5 x 47.63 x 22.23 x M10 (=)H5M18 x 1.5 per ISO6149
MG25/20 x 52.37 x 26.19 x M10 (=)H7M22 x 1.5 per ISO6149
NNWithout outlet port
To be used with rear ported units only.
H8M27 x 2 per ISO6149
H9M33 x 2 per ISO6149
H – Intermediate section
CC
Standard compact intermediate flange
I – Cover
E10
I10
P10
Rear cover for pump with relief valve with external drain 3/8 Gas
Rear cover for pump with relief valve with internal drain
Peak pressure is the highest intermittent pressure allowed at the pump's outlet. Peak pressure depends
on the relief valve over shoot (reaction time).
Rated pressure is the maximum continuous operating pressure. The maximum machine load demand
determines rated pressure.
Inlet Vacuum must be controlled in order to preserve pump's expected life and performance.
The system design must meet inlet pressure requirements during all operation modes. Expected lower
inlet pressures during cold start will be improved as soon as the fluid warms up.
Maximum speed is the limit recommended by Danfoss for a particular gear pump when operating at
rated pressure. It is the highest speed at which normal life can be expected.
Minimum speed is the lowest operating speed limit at which normal life can be expected. The minimum
speed increases according to operating pressure increase.
When operating at higher pressures, a higher minimum speed must be maintained, see below:
Hydraulic Fluids
Speed versus pressure
Operating envelope legend:
N1Minimum speed at 100 bar
N2Minimum speed at 180 bar
N3Minimum speed at rated pressure
Ratings and data for shhark® gear pumps are guaranteed when the hydraulic system operates with
premium hydraulic fluids without containing oxidation, rust, or foam inhibitors.
These fluids have to work with good thermal and hydrolytic stability to prevent wear, erosion, or
corrosion of internal components. They include:
•
Hydraulic fluids following DIN 51524, part 2 (HLP) and part 3 (HVLP) specifications
•
API CD engine oils conforming to SAE J183
•
M2C33F or G automatic transmission fluids
•
Certain agricultural tractor fluids
Caution
Use only clean fluid in the gear pumps and hydraulic circuit. Never mix hydraulic fluids.
Temperature and viscosity
Temperature and viscosity requirements must be concurrently satisfied. Use petroleum / mineral-based
fluids.
High temperature limits apply at the inlet port to the pump. The pump should run at or below the
maximum continuous temperature. The peak temperature is based on material properties. Don’t exceed
it.
Cold oil, generally, doesn’t affect the durability of pump components. It may affect the ability of oil to
flow and transmit power. For this reason, keep the temperature at 16 °C [60 °F] above the pour point of
the hydraulic fluid.
Minimum (cold start) temperature relates to the physical properties of component materials.
Minimum viscosity occurs only during brief occasions of maximum ambient temperature and severe
duty cycle operation. You will encounter maximum viscosity only at cold start. During this condition, limit
speeds until the system warms up. Size heat exchangers to keep the fluid within these limits. Test
regularly to verify that these temperatures and viscosity limits aren’t exceeded. For maximum unit
efficiency and bearing life, keep the fluid viscosity in the recommended
Fluid viscosity
Maximum (cold start)
Recommended range
Minimum
Temperature (with standard NBR seals)
Minimum (cold start)
Maximum continuous
Peak (intermittent)
Use a filter that conforms to Class 22/18/13 of ISO 4406 (or better). It may be on the motor outlet
(discharge filtration) or inlet (pressure filtration).
Selecting a filter
When selecting a filter, please consider:
•
Contaminant ingression rate (determined by factors such as the number of actuators used in the
system)
•
Generation of contaminants in the system
•
Required fluid cleanliness
•
Desired maintenance interval
•
Filtration requirements of other system components
Measure filter efficiency with a Beta ratio (βX). βx ratio is a measure of filter efficiency defined by ISO 4572.
It is the ratio of the number of particles greater than a given diameter (in microns) upstream of the filter
to the number of these particles downstream of the filter.
•
For discharge filtration with controlled reservoir ingression, use a β
•
For pressure filtration, use a filtration with an efficiency of β10 = 75
35-45
= 75 filter
The filtration requirements for each system are unique. Evaluate filtration system capacity by monitoring
and testing prototypes.
Fluid cleanliness level and βX ratio
Fluid cleanliness level (per ISO 4406)
βX ratio (discharge filtration)
βX ratio (pressure or return filtration)
Recommended inlet screen size
Reservoir
The reservoir provides clean fluid, dissipates heat, removes entrained air, and allows fluid volume
changes associated with fluid expansion and cylinder differential volumes. A correctly sized reservoir
accommodates maximum volume changes during all system operating modes. It promotes de-aeration
of the fluid as it passes through, and accommodates a fluid dwell-time between 60 and 180 seconds,
allowing entrained air to escape.
Minimum reservoir capacity depends on the volume required to cool and hold the oil from all retracted
cylinders, allowing for expansion due to temperature changes. A fluid volume of 1 to 3 times the pump
output flow (per minute) is satisfactory. The minimum reservoir capacity is 125% of the fluid volume.
Install the suction line above the bottom of the reservoir to take advantage of gravity separation and
prevent large foreign particles from entering the line. Cover the line with a 100-125 micron screen. The
pump should be below the lowest expected fluid level.
Put the return-line below the lowest expected fluid level to allow discharge into the reservoir for
maximum dwell and efficient deaeration. A baffle (or baffles) between the return and suction lines
promotes deaeration and reduces fluid surges.
Class 22/18/13 or better
β
= 75 and β10 = 2
35-45
β10 = 75
100 – 125 μm [0.004 – 0.005 in]
Line sizing
Choose pipe sizes that accommodate minimum fluid velocity to reduce system noise, pressure drops, and
overheating. This maximizes system life and performance.
Design inlet piping that maintains continuous pump inlet pressure above 0.8 bar absolute during normal
operation. The line velocity should not exceed the values in this table:
Most systems use hydraulic oil containing 10% dissolved air by volume. Under high inlet vacuum
conditions the oil releases bubbles. They collapse when subjected to pressure, resulting in cavitation,
causing adjacent metal surfaces to erode. Over-aeration is the result of air leaks on the inlet side of the
pump, and flow-line restrictions. These include inadequate pipe sizes, sharp bends, or elbow fittings,
causing a reduction of flow line cross sectional area. This problem will not occur if inlet vacuum and rated
speed requirements are maintained, and reservoir size and location are adequate.
Pump Drive
Shaft options for shhark® Group 2 gear pump include tapered, tang, splined, or parallel shafts. They are
suitable for a wide range of direct and indirect drive applications for radial and thrust loads.
Plug-in drives, acceptable only with a splined shaft, can impose severe radial loads when the mating
spline is rigidly supported. Increasing spline clearance does not alleviate this condition. Use plug-in drives
if the concentricity between the mating spline and pilot diameter is within 0.1 mm [0.004 in]. Lubricate
the drive by flooding it with oil. A 3-piece coupling minimizes radial or thrust shaft loads.
Pilot cavity
m/s [ft/sec]
2.5 [8.2]
5.0 [16.4]
3.0 [9.8]
Caution
In order to avoid spline shaft damages it is recommended to use carburized and hardened steel
couplings with 80-82 HRA surface hardness.
Allowable radial shaft loads are a function of the load position, load orientation, and operating pressure
of the hydraulic pump. All external shaft loads have an effect on bearing life, and may affect pump
performance.
In applications where external shaft loads can’t be avoided, minimize the impact on the pump by
optimizing the orientation and magnitude of the load. Use a tapered input shaft; don’t use splined shafts
for belt or gear drive applications. A spring-loaded belt tension-device is recommended for belt drive
applications to avoid excessive tension. Avoid thrust loads in either direction. Contact Danfoss if
continuously applied external radial or thrust loads occur.
Pump Life
Pump life is a function of speed, system pressure, and other system parameters (such as fluid quality and
cleanliness).
All Danfoss gear pumps use hydrodynamic journal bearings that have an oil film maintained between the
gear/shaft and bearing surfaces at all times. If the oil film is sufficiently sustained through proper system
maintenance and operating within recommended limits, long life can be expected.
B10 life expectancy number is generally associated with rolling element bearings. It does not exist for
hydrodynamic bearings.
High pressure, resulting from high loads, impacts pump life. When submitting an application for review,
provide machine duty cycle data that includes percentages of time at various loads and speeds. We
strongly recommend a prototype testing program to verify operating parameters and their impact on life
expectancy before finalizing any system design.
Sound Level
Fluid power systems are inherent generators of noise. As with many high power density devices, noise is
an unwanted side effect.
However, there are many techniques available to minimize noise associated with fluid power systems. To
apply these methods effectively, it is necessary to understand how the noise is generated and how it
reaches the listener. The noise energy can be transmitted away from its source as either fluid borne noise
(pressure ripple) or as structure borne noise.
Fluid borne noise (pressure ripple) is the result of the number of pumping elements (gear teeth)
delivering oil to the outlet and the pump’s ability to gradually change the volume of each pumping
element from high to low pressure. In addition, the pressure ripple is affected by the compressibility of
the oil as each pumping element discharges into the outlet of the pump. Pressure pulsations will travel
along the hydraulic lines at the speed of sound (about 1400 m/s in oil) until affected by a change in the
system such as an elbow fitting. Thus the pressure pulsation amplitude varies with overall line length and
position.
Structure borne noise may be transmitted wherever the pump casing is connected to the rest of the
system. The response of one circuit component to excitation depends on its size, form, and manner in
which it is mounted or supported. Because of this excitation, a system line may actually have a greater
noise level than the pump. To reduce this excitation, use flexible hoses in place of steel plumbing. If steel
plumbing must be used, clamping of lines is recommended. To minimize other structure borne noise, use
flexible (rubber) mounts.
Contact your Danfoss representative for assistance with system noise control.
The sound level graph below shows comparative sound pressure levels for shhark® and standard pumps
(with SAE A flange and spline shaft) expressed in dB(A) at 1 m [3.28 ft] from the unit.
Data were taken using ISO VG46 petroleum /mineral based fluid at 50°C (viscosity at 28 mm2/s [cSt]).
For more details about shhark® noise performance contact your Danfoss Sales Representative.
Direction is viewed facing the shaft. Group 2 pumps are available with a variety of tang, splined, parallel,
and tapered shaft ends. Not all shaft styles are available with all flange styles.
Model code section H
ABCDEFGHIJKLMNO
Shaft versus flange availability and torque capability
ShaftMounting flange code with maximum torque in N•m [lbf•in]
DescriptionCode010203040506
Other shaft options may exist. Contact your Danfoss representative for availability.
Caution
Shaft torque capability may limit allowable pressure. Torque ratings assume no external radial loading.
Applied torque must not exceed these limits, regardless of stated pressure parameters. Maximum torque
ratings are based on shaft torsional fatigue strength.
The second section torque limit is equal to 120 N•m. Other configuration with higher rated torque are
available upon request.
Pumps with integral relief valve • internally and externally drained
Group 2 pumps are offered with an optional integral relief valve in the rear cover . This valve can have
an internal (I10 cover option) or external drain (E10 cover option).
This valve opens directing all flow from the pump outlet to the internal or external drain when the
pressure at the outlet reaches the valve setting. This valve can be ordered preset to the pressures shown
in the table below. Valve performance curve, rear cover cross-section and schematics are shown below.
Integral relief valve performance graph
Integral relief valve cross-section
1. Inlet
2. Drain
Caution
When the relief valve is operating in bypass condition, rapid heat generation occurs. If this bypass
condition continues, the pump prematurely fails. The reason for this is that it is a rule, not an exception.
When frequent operation is required, external drain option must be used.
CodePressure settingCodePressure setting
ANo setting
BNo valveP100 bar [1450 psi]
C18 bar [261 psi]Q110 bar [1595 psi]
D25 bar [363 psi]R120 bar [1740 psi]
E30 bar [435 psi]S130 bar [1885 psi]
F35 bar [508 psi]T140 bar [2030 psi]
G40 bar [580 psi]U160 bar [2320 psi]
K50 bar [725 psi]V170 bar [2465 psi]
L60 bar [870 psi]W180 bar [2611 psi]
M70 bar [1015 psi]X210 bar [3046 psi]
N80 bar [1160 psi]Y240 bar [3480 psi]
O90 bar [1305 psi]Z250 bar [3626 psi]
Caution
For pressures higher than 210 bar or lower than 40 bar apply to your Danfoss representative.
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000
Danfoss
Power Solutions Trading
(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 2080 6201
Products we offer:
Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com
Cartridge valves
•
DCV directional control
•
valves
Electric converters
•
Electric machines
•
Electric motors
•
Gear motors
•
Gear pumps
•
Hydraulic integrated
•
circuits (HICs)
Hydrostatic motors
•
Hydrostatic pumps
•
Orbital motors
•
PLUS+1® controllers
•
PLUS+1® displays
•
PLUS+1® joysticks and
•
pedals
PLUS+1® operator
•
interfaces
PLUS+1® sensors
•
PLUS+1® software
•
PLUS+1® software services,
•
support and training
Position controls and
•
sensors
PVG proportional valves
•
Steering components and
•
systems
Telematics
•
Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and
electric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as the
marine sector. Building on our extensive applications expertise, we work closely with you to
ensure exceptional performance for a broad range of applications. We help you and other
customers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.
Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.
Go to www.danfoss.com for further product information.
We offer you expert worldwide support for ensuring the best possible solutions for
outstanding performance. And with an extensive network of Global Service Partners, we also
provide you with comprehensive global service for all of our components.
Local address:
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.