Danfoss D–Series Cast Iron Gear Motors User guide

4 (1)

Technical Information

D–Series Cast Iron Gear Motors

Including Fan Drive

www.danfoss.com

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Revision history

Table of revisions

 

 

 

 

 

 

 

 

Date

 

Changed

Rev

 

 

 

 

 

 

March 2021

 

Updated product code information for anti-cavitation / shock valve function; updated radial

0105

 

 

 

and axial loading information

 

 

 

 

 

 

 

May 2020

 

Updated table in Dimension drawings section: Standard motor

0103

 

 

 

 

 

 

December 2019

 

Dimensions for standard motor change.

0102

 

 

 

 

 

 

October 2019

 

First edition

0101

 

 

 

 

 

2 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

 

 

D–Series Cast Iron Gear Motors, Including Fan Drive

 

 

Contents

 

 

General information

 

 

Overview..............................................................................................................................................................................................

 

5

Features and Benefits................................................................................................................................................................

 

5

Fan drive motors.........................................................................................................................................................................

 

5

Features................................................................................................................................................................................................

 

6

Benefits.................................................................................................................................................................................................

 

6

System schematics...........................................................................................................................................................................

 

7

Product features................................................................................................................................................................................

 

8

Technical specifications.................................................................................................................................................................

 

9

Fluid specifications..........................................................................................................................................................................

 

9

Sizing equations.............................................................................................................................................................................

 

10

Operating Parameters

 

 

Overview...........................................................................................................................................................................................

 

11

Pressure.............................................................................................................................................................................................

 

11

Peak pressure.............................................................................................................................................................................

 

11

Rated pressure...........................................................................................................................................................................

 

11

System pressure........................................................................................................................................................................

 

11

Back pressure.............................................................................................................................................................................

 

11

Case drain pressure..................................................................................................................................................................

 

11

Temperature and viscosity.........................................................................................................................................................

 

12

Temperature...............................................................................................................................................................................

 

12

Viscosity........................................................................................................................................................................................

 

12

Speed............................................................................................................................................................................................

 

12

Hydraulic fluid.................................................................................................................................................................................

 

12

Filtration............................................................................................................................................................................................

 

13

Filters.............................................................................................................................................................................................

 

13

Selecting a filter.........................................................................................................................................................................

 

13

Reservoir............................................................................................................................................................................................

 

13

Line sizing.........................................................................................................................................................................................

 

14

Motor life...........................................................................................................................................................................................

 

14

Motor shaft connection...............................................................................................................................................................

 

14

Radial and axial loading...............................................................................................................................................................

 

15

Product code

 

 

Model code.......................................................................................................................................................................................

 

16

Fan drive motor code example.................................................................................................................................................

 

16

A - Sense of rotation................................................................................................................................................................

 

16

B1 - Displacement.....................................................................................................................................................................

 

16

B2 - Input shaft...........................................................................................................................................................................

 

16

C - Mounting flange.................................................................................................................................................................

 

17

D1 - Cover....................................................................................................................................................................................

 

17

D2 - Rear cover port option...................................................................................................................................................

 

18

D - Rear cover availability.......................................................................................................................................................

 

18

E - Relief valve availability......................................................................................................................................................

 

19

F - Anti-cavitation/shock valve function..........................................................................................................................

 

20

G - Integrated reversing modulating function...............................................................................................................

 

20

J - Name plate............................................................................................................................................................................

 

21

K - Name plate............................................................................................................................................................................

 

21

Dimension drawings

 

 

Mounting flanges...........................................................................................................................................................................

 

23

Shaft options....................................................................................................................................................................................

 

24

Port options......................................................................................................................................................................................

 

27

Selecting port options..................................................................................................................................................................

 

28

Integrated reversing motor with proportional relief and shock/anti-cavitation valves......................................

29

Features and benefits..............................................................................................................................................................

 

29

Technical data............................................................................................................................................................................

 

29

Integrated reversing function..............................................................................................................................................

 

30

Options

 

 

© Danfoss | March 2021

BC319463833479en-000105 | 3

Technical Information

 

D–Series Cast Iron Gear Motors, Including Fan Drive

 

Contents

 

Standard relief valve.....................................................................................................................................................................

31

Anti-cavitation check valve........................................................................................................................................................

32

Proportional relief valve with anti-cavitation valve...........................................................................................................

33

Valve settings.............................................................................................................................................................................

34

Performance graphs................................................................................................................................................................

35

Valve settings.............................................................................................................................................................................

36

Performance graphs................................................................................................................................................................

36

Hall effect speed sensor...............................................................................................................................................................

37

Dimension drawings

 

Fan drive motor..............................................................................................................................................................................

39

Standard motor..............................................................................................................................................................................

39

Standard motor with split flange ports..................................................................................................................................

40

Integrated reversing motor with proportional relief and shock/anti-cavitation valves......................................

42

Performance data

 

Motor performance graphs........................................................................................................................................................

44

4 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

Overview

The Danfoss D Series fixed displacement gear motor has been specifically designed for demanding mobile equipment applications where maximum performance is required at peak power levels and operating temperatures.

The D Series motor is available in displacements of 17.6cm³ to 48,3cm³ [1.08 in3 to 2.95 in3]. This motor delivers consistent efficiency across the entire operating range of pressure, speed, and temperature; all in an industry-leading package size that maximizes power density.

Features and Benefits

High strength cast iron construction allows consistently efficient performance in continuous operation at 276 bar (4000 psi) and 110°C (230°F).

Custom engineered shaft bearings and dual pressure-balanced thrust plates optimize internal bearing lubrication, allowing for high starting torque and long life with fluid viscosities as low as 8 mm²/sec (cSt) [52 SUS].

Compact three-piece design with bearings located in the front flange and rear cover minimizes the overall package length and increases radial load carrying capability, eliminating the need for outrigger bearings on most applications.

Variety of integrated valve options make the D Series motor ideally suited for high performance fan drive applications.

Fan drive motors

D Series cast iron motors complement the Danfoss portfolio of fan drive products. Including aluminum and cast iron pumps and motors, piston pumps and motors, valves and microcontrollers, you can apply the Danfoss range in various combinations to create high-performance fan drive systems. D series motors with integrated reversing and proportional relief valves are PLUS+1® Compliant for easy plug-and- performinstallations and offer precise control of fan speed to optimize engine cooling performance.

Quick reference chart: Fan drive motors

 

psi

Bar

 

 

 

 

 

 

 

 

 

 

 

 

 

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SERIES 40 Piston Motor

 

 

 

5000

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

300

 

 

 

 

D SERIES Cast Iron Gear Motor

 

 

 

 

4000

 

 

 

 

 

 

 

 

 

 

 

 

<![if ! IE]>

<![endif]>Pressure

 

250

 

 

 

 

 

 

 

 

 

 

 

3000

200

SGM2Y Aluminum

 

 

SGM3Y Aluminum

 

 

 

Gear Motor

 

 

 

Gear Motor

 

 

 

 

 

 

 

 

 

 

 

 

2000

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

1000

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

0

 

 

 

 

 

 

 

 

 

 

cm3/rev

 

 

0

5

10

15

20

25

30

35

40

45

50

 

 

0

 

0.5

1.0

 

1.5

2.0

 

2.5

 

3.0

in3/rev

 

 

 

 

 

 

Displacement

 

 

P107 949E

 

© Danfoss | March 2021

 

 

 

 

 

 

 

 

 

BC319463833479en-000105 | 5

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

Features

Quality components and construction

Pressure balanced bronze-on-steel thrust plates

High strength ductile iron body and covers

Dust protector

Heavy duty, low friction hydrodynamic journal bearings

High performance integrated

PLUS+1 TM compliant

valves Radial case drain

Flexible configuration of shaft, flange

and ports

One piece steel gears with 12 tooth profile

High temperature

Viton ® seals

P107 920E

Benefits

Pressure-balanced thrust plates for improved efficiency at extreme pressures and temperatures

High-temperature Viton® seals for today’s hotter running machines

Three-piece ductile iron construction for increased durability, increased power density, with reduced adverse efficiency effects at high temperatures

High quality steel backed bronze bearings for maximum pressure handling capacity, located in the front flange, allowing extended radial loading capacity without an external roller bearing

Output shaft external dust protector to protect the oil seal from contamination damage

Available side or rear ports, SAE A or B flange, with a variety of shafts for versatility

Integrated, normally-closed electrohydraulic proportional relief valve option for today’s highperforming fan systems

6 | © Danfoss | March 2021

BC319463833479en-000105

Danfoss D–Series Cast Iron Gear Motors User guide

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

System schematics

Gear pump/gear motor system with electronic control

 

 

 

 

 

CAN bus

 

 

 

PLUS+1TM

 

 

 

Microcontroller

 

RESERVOIR

 

 

 

 

Filter

 

 

 

 

Temperature

 

 

 

sensors

 

 

 

T1

 

<![if ! IE]>

<![endif]>drain

 

T2

 

<![if ! IE]>

<![endif]>Case

 

 

 

 

 

D Series

D Series

 

DIESEL ENGINE

gear pump

gear motor

T3

 

 

 

 

 

 

 

 

P107 929E

Piston pump/gear motor system with electronic control

 

 

 

 

 

CAN bus

 

 

 

Microcontroller

 

RESERVOIR

 

(PLUS+1TM)

 

 

 

 

 

Filter

 

 

 

 

Temperature

 

 

<![if ! IE]>

<![endif]>Case

sensors

 

 

T1

 

 

<![if ! IE]>

<![endif]>drain

 

 

 

 

T2

 

Series 45

 

 

DIESEL ENGINE

variable pump

D Series

T3

 

 

 

gear motor

 

 

 

 

P107 931E

© Danfoss | March 2021

BC319463833479en-000105 | 7

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

Gear pump/gear motor system with integrated reversing valve

Product features

Features

Descriptions

 

 

Construction

Heavy duty ductile iron 3-piece construction

 

 

Displacements

17.6 to 48.3 cm³ [1.08 to 2.95 in3/rev]

Continuous

276 bar [4000 psi] to 40.9 cm³ [2.50 in3]

Pressure

 

 

 

Peak Pressure

303 bar [4400 psi] to 40.9 cm³ [2.50 in3]

Speed

600 to 3400 min-1 (rpm) - up to 40.9 cm³ [2.50 in3]

Mounting

SAE A two bolt, SAE B two bolt

 

 

Shaft (types)

SAE straight keyed, 1:8 tapered keyed, splined

 

 

Fluid viscosity

8 mm²/sec (cSt) [52 SUS] minimum, 1600 mm²/sec (cSt) [7500 SUS] maximum

 

 

Filtration

22/18/13 ISO 4406 at motor inlet

requirement

 

 

 

Inlet options

SAE O-ring boss, SAE split flange

 

 

Fluids

Petroleum/mineral based

 

 

Operating

-40°C [-40°F] minimum for cold start

temperature

110°C [230°F] normal operating conditions 115°C [239°F] peak intermittent

Integrated valve

Proportional relief valve, normally closed, 12 Vdc and 24 Vdc

options

Two position directional control valve, 12 Vdc and 24 Vdc

 

Relief valve

 

Anti-cavitation check valve

 

 

8 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

Technical specifications

Technical data for D Motors

Ratings

Units

17

19

21

23

25

29

32

36

38

41

45

 

 

 

 

 

 

 

 

 

 

 

 

 

Displacement

cm3/rev

17.6

19.9

22.4

23.2

26.2

30.6

34.4

38.6

40.9

42.9

48.3

 

in3/rev

1.08

1.22

1.37

1.42

1.6

1.87

2.1

2.36

2.5

2.62

2.95

Rated pressure

bar

276

276

276

276

276

276

276

276

276

241

210

 

 

 

 

 

 

 

 

 

 

 

 

 

 

psi

4000

4000

4000

4000

4000

4000

4000

4000

4000

3495

3045

 

 

 

 

 

 

 

 

 

 

 

 

 

Peak pressure

bar

303

303

303

303

303

303

303

303

303

265

231

 

 

 

 

 

 

 

 

 

 

 

 

 

 

psi

4400

4400

4400

4400

4400

4400

4400

4400

4400

3843

3350

 

 

 

 

 

 

 

 

 

 

 

 

 

Speed at rated pressure

maximum

3400

3400

3400

3400

3400

3400

3400

3400

3400

3000

3000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

minimum*

1000

600

600

600

600

600

600

600

600

600

600

Start speed at 1000 PSI

rpm

400

400

400

400

400

400

400

400

400

400

400

 

 

 

 

 

 

 

 

 

 

 

 

 

Standard Weight

kg

8.53

8.66

8.80

8.94

9.07

9.38

9.53

9.84

9.93

10.16

10.43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lb

18.8

19.1

19.4

19.7

20.0

20.7

21.0

21.7

21.9

22.4

23.0

 

 

 

 

 

 

 

 

 

 

 

 

 

Mass moment of inertia of

x10-6 kg•m²

127

138

146

156

172

191

206

228

239

255

276

internal rotating components

 

 

 

 

 

 

 

 

 

 

 

 

x10-6slug•ft²

94

102

107

115

127

141

152

168

176

188

204

 

Theoretical torque at rated

N•m

65.7

73.4

79.2

87.0

98.2

112.1

122.9

139.6

146.9

138.4

132.4

pressure

 

 

 

 

 

 

 

 

 

 

 

 

lbf•ft

48.5

54.2

58.4

64.2

72.4

82.7

90.7

102.9

108.3

102.1

97.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Theoretical power at rated

kW

23.4

26.1

28.2

31.0

35.0

39.9

43.8

49.7

46.1

43.5

41.6

speed

 

 

 

 

 

 

 

 

 

 

 

 

hp

31.2

34.9

37.6

41.3

46.6

53.2

58.4

66.3

61.1

58.0

55.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Case drain pressure

bar

5.0

5.0

5.0

5.0

5.0

5.0

5.0

5.0

5.0

5.0

5.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

psi

72.5

72.5

72.5

72.5

72.5

72.5

72.5

72.5

72.5

72.5

72.5

 

 

 

 

 

 

 

 

 

 

 

 

 

* minimum speed at maximum pressure

Fluid specifications

Parameter

Unit

Minimum

 

Continuous

 

Maximum

 

 

 

 

 

 

 

Viscosity

mm²/sec (cSt)

8

 

10 - 100

 

1600

 

[SUS]

[52]

 

[59 - 456]

 

[7500]

 

 

 

 

 

 

 

Temperature

°C [°F]

-40 [-40]

 

110 [230]

 

115 [239]

 

 

 

 

 

 

 

Cleanliness

n/a

 

ISO 4406 Class 22/18/13 or better

 

 

 

 

 

 

 

Filtration efficiency

charge filtration

 

 

β15-20 =75(β10≥10)

 

Ratings are based on operation with premium petroleum-based hydraulic fluids containing oxidation, rust, and foam inhibitors.

© Danfoss | March 2021

BC319463833479en-000105 | 9

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

General information

Sizing equations

Use these formulas to determine the nominal motor size for a specific application.

Based on SI units

Input flow Q =

 

Vg

• n

 

(l/min)

1000 • ηv

 

 

Output torque M =

Vg • p • ηm

(N•m)

 

20 • π

 

 

 

Output power P =

 

Q •

p • ηt

(kW)

 

600

 

 

Motor speed n = Q • 1000 • ηv (min-1(rpm))

Vg

Variables SI units [US units]

Based on US units

Input f low Q =

Output torque M =

Output power P =

Vg • n

231 • ηv

Vg • p • ηm 2 • π

Q • p • ηt 1714

(US gal/min)

(lbf•in)

(hp)

Motor speed n = Q • 231• ηv (min-1(rpm))

Vg

Vg

=

Displacement per revolution

cm3/rev [in3/rev]

pO

=

Outlet pressure

bar [psi]

pi

=

Inlet pressure

bar [psi]

p

=

pO – pi (system pressure)

bar [psi]

n

=

Speed

min-1 (rpm)

ηv

=

Volumetric eff ciency

 

ηm

=

Mechanical eff ciency

 

ηt

=

Overall eff ciency (ηv ηm)

 

10 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Operating Parameters

Overview

Definitions of the D Series operating parameters appear here. Consult your Danfoss representative for applications running outside of these parameters.

Pressure

Peak pressure

Peak pressure is the highest intermittent pressure allowed.

The relief valve overshoot (reaction time) determines peak pressure. It is assumed to occur for less than 100 ms. The accompanying illustration shows peak pressure in relation to rated pressure and reaction time (100 ms maximum).

<![if ! IE]>

<![endif]>Pressure

Peak pressure

Rated pressure

 

 

Reaction time (100 ms max)

 

Time

 

P107 861E

Rated pressure

Rated pressure is the average, regularly occurring operating inlet pressure that should yield satisfactory product life. The maximum machine load at the motor shaft determines rated pressure.

System pressure

System pressure is the differential between the inlet and outlet ports.

It is a dominant operating variable affecting hydraulic unit life. High system pressure, resulting from high load at the motor shaft, reduces expected life. System pressure must remain at, or below, rated pressure during normal operation to achieve expected life.

Back pressure

The hydraulic load downstream of the motor determines the back pressure. The D Series motor can work with back pressure up to 100% of the maximum rated inlet pressure.

Case drain pressure

Case drain pressure is the pressure in the case drain line. Route case drain plumbing directly to the reservoir to keep the case drain pressure as low as possible. Maximum continuous case drain pressure allowed is 5 bar [72.5 psi].

© Danfoss | March 2021

BC319463833479en-000105 | 11

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Operating Parameters

Temperature and viscosity

Temperature and viscosity requirements must be concurrently satisfied.

Temperature

High temperature limits apply at the inlet port of the motor. Ensure the motor runs at or below the maximum continuous temperature.

Cold oil, generally, does not affect the durability of motor components. It may affect the ability of oil to flow and transmit power. For this reason, keep the temperature at 16°C [61 °F] above the pour point of the hydraulic fluid.

Minimum (cold start) temperature relates to the physical properties of component materials. Continuous temperature is the temperature at or below which you may expect normal motor life.

Maximum temperature is the highest temperature that is tolerable by the machine for a transient/ limited time. (Duty cycle 1% or less)

Viscosity

Minimum viscosity occurs only during brief occasions of maximum fluid temperature and severe duty cycle operation. It’s the minimum acceptable viscosity to guarantee the motor life. (Duty cycle 1% or less)

Maximum viscosity occurs only during cold start at very low temperatures. It is the upper limit of viscosity that allows the motor to start.

Continuous viscosity is the viscosity range at which you may expect normal motor.

Speed

Maximum speed is the limit for a particular gear motor when operating at rated pressure. It is the highest speed at which you may expect normal life.

The lower limit of operating speed is the minimum speed.

Minimum speed increases as operating system pressure increases. When operating under higher pressures, a higher minimum speed must be maintained, as shown.

Rated

<![if ! IE]>

<![endif]>Pressure - bar [psi]

69

[1000]

0

Operating envelope

400

600

Rated

 

Speed - min¯¹ (rpm)

P107 960E

Hydraulic fluid

Ratings and data for gear motors are based on operation with premium hydraulic fluids containing oxidation, rust, and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear, and corrosion of internal components. Use petroleum/mineral-based fluids. Ensure only clean fluid enters the hydraulic system.

12 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Operating Parameters

C Caution

Never mix hydraulic fluids.

Filtration

Filters

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 β35-45 = 75 filter

For pressure filtration, use a filtration with an efficiency of β10 = 75

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)

Class 22/18/13 or better

 

 

βX ratio (discharge filtration)

β35-45 = 75 and β10 = 2

βX ratio (pressure or return filtration)

β10 = 75

Recommended inlet screen size

100 – 125 μm [0.004 – 0.005 in]

 

 

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.

© Danfoss | March 2021

BC319463833479en-000105 | 13

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Operating Parameters

Line sizing

Choose pipe sizes that accommodate minimum fluid viscosity to reduce system noise, pressure drops and overheating in order to maximize system life and performance. Line velocity should not exceed 6.0 m/s [20.0 ft/s]. Route case drain line direct to tank.

Most systems use hydraulic oil containing 10% dissolved air by volume. Over-aeration, or entrained air is the result of flow line restrictions, where the dissolved air comes out of solution, or when air is allowed to leak into the hydraulic circuit. These include inadequate pipe sizes, sharp bends, or elbow fittings, causing reduction of flow-line cross-sectional area. This problem will not occur if these circuit recommendations are followed, rated speed requirements are maintained, and reservoir size and location are adequate.

Motor life

Motor life is a function of speed, system pressure, and other system parameters (such as fluid quality and cleanliness).

All Danfoss gear motors use hydrodynamic journal bearings that rely on an oil film between the gear shaft and bearing surfaces at all times. You can expect long life when this film is sustained through proper system maintenance and operating within recommended limits.

A B10 bearing life expectancy number is generally associated with rolling element bearings. It does not exist for hydrodynamic bearings.

High pressure impacts motor 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.

Motor shaft connection

Shaft options for gear motors include tapered, splined, and parallel shafts.

Plug-in drives, 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 only if the concentricity between the mating spline and pilot diameter is within 0.1 mm [0.004 in]. Lubricate the drive by flooding with oil. A three-piece coupling minimizes radial or thrust shaft loads.

Motor shaft connection

To avoid spline shaft damage, use carburized and hardened steel couplings with 80-82 HRA surface hardness.

14 | © Danfoss | March 2021

BC319463833479en-000105

Technical Information

D–Series Cast Iron Gear Motors, Including Fan Drive

Operating Parameters

Radial and axial loading

External shaft loads may have an effect on bearing life, and may affect motor performance depending on several factors such as load position and orientation, operating pressure, oil viscosity and motor speed.

D-motors are capable of carrying most plastic fans up to 11.75 kg (26 lbm) at rated pressure and speed. For any other application where radial and/or axial shaft loads are present, pleas fill in the Motor shaft load data form and contact your Danfoss representative for technical assistance.

Shaft loading

Motor shaft load data form

Item

Value

Based on SI or US units

 

 

 

 

Motor displacement

 

cm3/rev

in3/rev

Rated system pressure

 

bar

PSI

 

 

 

 

Peak pressure

 

 

 

 

 

 

 

Motor shaft rotation

 

left

right

 

 

 

 

Motor minimum speed

 

min-1 (RPM)

 

Motor maximum speed

 

 

 

 

 

 

 

Radial load

 

N

lbf

 

 

 

 

Angular orientation from 12:00 (α)

 

12:00 - 11:59

 

 

 

 

 

Axial load

 

N

lbf

 

 

 

 

Distance from flange (L1)

 

mm

in

© Danfoss | March 2021

BC319463833479en-000105 | 15

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