PowerPoint Presentation
MANTECH 4PD3
A typical assembly includes a base mount AC motor, a rigid
clamping shaft coupling and a gear pump.
Sevastian Irimie
Rectangle
Sevastian Irimie
Rectangle
Sevastian Irimie
Rectangle
The project objective is to design the gear pump
Gear pumps are a positive displacement rotary pump with two gears of
equal size. Fluid is drawn into the pump by the gear teeth as they come
out of mesh and is ca
ied to the discharge side of the pump by the
otating gears where it is forced from the pump by the meshing teeth.
The inlet port of the pump is on the side where the gears are coming out
of mesh; the discharge port is on the side of the pump where the gears
are coming in to mesh. The pump is used to transfer a non a
asive, low
viscosity oil (density = .036 l
cubic in).
External Gear Pump
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Gears
An external gear pump unit is to be designed
according to the data provided and the following
specifications.
You will use Class "C" - Quality 10 Spur Gears with 20° pressure angle.
The service is continuous, with indefinite life.
Gear material: Ca
urized steel or nitrided , ground after heat treating to achieve a
precision tooth form. “Machinery’s Handbook” (Pg.2148)
Gears will be positioned in the shaft by a square key, and locked in
position by two retaining rings.
(Ca
on spring steel XXXXXXXXXX).
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O Ring
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Gear Housing
Inlet port diameter
has to be smaller
than b (gear width).
Sut=50 kpsi,
Syt=40 kpsi.
Shafts and Keys
Compute shaft diameters based on DE ASME
method (FS=2.5-4.5).
Use ASME code for shaft design.
Initial material could be assumed as AISI 1040 CD.
Sut=80 kpsi, Syt=71 kpsi.
Design the keys with suitable material.
(length 70-150% of shaft dia)
The working temperature of the pump is between XXXXXXXXXXdeg
Fahrenheit.
Make sure you take in consideration shaft thermal expansion.
The shaft is subjected to constant torque and reversed bending.
See Links for retaining ring numbe
Fillet radii for both internal and external
etaining rings.
Bearings
Both bearings will be locked on the shaft by
etaining rings.
Preferable bearings should be sealed from the
manufacturer.
Mechanical seal
We will use a type 8-1 heavy duty mechanical seal,
suitable for medium-high inlet pressure.
Bearing and Seat Housing
Cap screws
Gasket
Lockwashers
Mechanical Seal Head
Mechanical Seal Seat
Shaft Support Bearing
Drive Shaft
Threaded pipe fitting -
e Pu1np Li11er Plates
These components are located on both sides of the cylinder for pumps that require them.
They are typically used when the bearing plate ·wear surface is not acceptable for the gear
to rotate against, or in situations where the liquid being pumped is extremely a
asive.
Northern Pump offers several options for materials of construction, most of which are
very hard. An extremely valuable benefit of the liner plates is the ability to replace them
during an overhaul, thus, reducing maintenance and life cycle costs.
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- '
' ' -
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e Pu1np Beari11g Plates
These components are located on both sides of the cylinder, or outside the liner plates on
pumps that are liner plate equipped. Their main purpose is to hold the main shaft
earings. They will have O-rings on both sides.
ASTM A48 Cast Iron
Most standard and medium
pressure applications
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e Seal Housing or End Cap
The seal housing holds the needle roller bearing and the oil seal.
The bearing is greased externally through a grease fitting.
This bearing helps stabilize the shaft which extends seal life.
The housing is sealed with a gasket and O-ring (Nitrile Ru
er - NBR). We will use
adial positive contact seal (MHSA type-Nitrile Ru
er - NBR) to seal the shaft.
A suitable bolt pattern will be used to hold the end cap.
Material: Ductile cast iron ASTM A536
Specify the weight of the Gear Box in the
assembly's drawing title block.
Apply proper rounds and fillets for the entire design.
Apply proper material for all part files.
Specify the weight of the gear pump in the title block.
The gear pump will have attached two eye lifting bolts.
Fits and tolerances:(suggested)
LT5- shaft and gea
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bearings |Efficiency
PARAMETER DISTANCE DEFINITIONS
External
Needle bearing je——— Lmax —> retaining rings
Std dia
Mechanical
seal seat
Mechanical
seal
Ball bearing
(or Cylindncal Roller Bearing
for hiaher dvnamic loads)
GEAR PUMP DESIGN PROJECT
INTERIM REPORT – SHAFTS, KEYS AND BEARINGS DESIGN
1. Analyze primary and secondary shafts using DE-ASME equations. Factor of safety
against fatigue should be a minimum of XXXXXXXXXXAll calculations are to be referenced
and presented in the formal report.
2. Select suitable SKF (or other) bearings from appropriate references or the SKF website.
Verify the bearings’ suitability using appropriate analysis. Use 25 khrs as a starting point
for your desired life for the bearing selection. Bearings should be sealed from
manufacturer.
3. Design the keyways, keyseats and keys according to the shaft diameters and required hub
lengths. Verify through proper analysis that the keys will have a lower factor of safety
than the shafts and the hub of the gears. Select a proper material for your key.
Submit the following files to AVENUE on the date specified in Announcements.
DRAWINGS
Include the following files in SLDASM, SLDPRT and in PDF formats.
1. Design of shafts, bearings, keys and any other components as subassemblies and detail
drawings.
2. Subassemblies (one exploded for each shaft with BOM and one of each of the two shafts
which illustrate
oken out sections of critical component fits and details, ie. Bearing
inner race radii and shoulder radii, keyway radii and key fitment requirements, gear
hu
key/shaft, retaining ring grooves with ring, etc..) and detail drawings of redesigned
shafts, keys and bearings. Detail drawings should be FULLY dimensioned and include a
evision table and proper title block to ANSI standards, and GDT to ASME Y14.5-
2018 standard.
NOTE: All files should be present to allow the subassemblies and parts to be opened in
SolidWorks.
REPORT (Submit as ONE file in PDF format only)
1. Front cover sheet should include Title, Case Number, Group Number and Names, Date of
Submission.
2. Fully detailed Table of Contents for the full report package. Appendices should also
include a Table of Contents indicating the information included in each.
3. Executive summary (inserted before drawings) at the front of the report should include
initial case parameters, justification for any revised parameters due to the redesign and all
factors of safety and all design changes summarized in tabular form. Also include a
detailed labeled diagram of shaft(s) locations which were analyzed.
4. Drawings of subassemblies and co
esponding detail drawings for all components in
proper order.
5. All analysis of shaft(s) F.O.S’s, key design and bearing selection calculations on the
provided calculation sheet format including references, dates and designer’s name(s).
6. Appendices will include copies of all references such as bearing specs, material specs,
and all supplier information for purchased components. Appendices should also include a
Table of Contents indicating the information included in each.
REPORT and ANALYSIS: (15 Marks)
Format (page layout, dates, references, etc…) /2
Summary of Design Changes /2
Force Analysis (loads, V, BM, Torque diagrams) /2
Stress Concentration Factors (shoulders, grooves, keyway) /2
DE-ASME Design equations (factors of safety and diameter re-design) /3
Key Calculations /2
Bearing Selection Calculations /2
DETAIL DRAWINGS (15 Marks)
Title Block /2
Revision Table and Notes /2
Critical Dimensions (Required Tolerances, major shaft dia’s, /8
earing seats, keyway, retaining rings, etc…)
Datums and GD &T /3
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