1 *BASED ON JOB-SITE STUDIES AND SATISFIED CUSTOMER REPORTS
Electro Shear ® Oil Shear Motor Brakes
High Performance AC Brake Technology,For Superior Heat Dissipation
The Electro Shear® Oil Shear Motor Brakes areproven and reliable in the toughest industrialapplications. Midwest Brake has been theleader in oil shear brake technology forover 35 years, offering the highestquality, most reliable brakes available inthe market today.
Originally developed for the rigorous stops and startsof automotive transfer lines, Electro Shear® Oil Shearbrakes are designed for excellent heat dissipation,which allows for higher cycle rates without brake fade.
Increased Machine Productivity, Reduced Life Cycle Costs
Oil Shear Brake Technology dramatically increases brakelife through superior heat dissipation. Torque is transferredthrough viscous shearing of oil between multiple frictiondisc surfaces, resulting in very little friction disc wear.
A continuous oil flow lubricates and cools discs allowing theheat build up from engagement to dissipate through thecast aluminum housing.
Electro Shear® brakes last up to 10 times longer* thanstandard dry friction brakes due to the oil shear design andadvanced composite friction material.
Exceptionally Long Life,Eliminate Frequent Repairs
Electro Shear® dramatically increases brake service lifethrough the advanced, totally encapsulated AC coiltechnology and the high performance composite frictionmaterial.
In many cases, the Electro Shear® will outlast andoutperform typical dry friction brakes up to 10 to 1. ElectroShear® brakes keep performing where other brakes fail,reducing the need for frequent, costly repairs. ElectroShear® will eliminate downtime and reduce operating costsyear after year, cycle after cycle.
Constant Tension Winch Applications – External Encoder Mounting
2
Electro Shear ® Oil Shear Motor Brakes
Proven In Tough Applications
Electro Shear® is proven andreliable for heavy, industrialequipment in dirty, wetproduction environmentswhere typical dry frictionbrakes fail.
Specially designed for highcyclic applications, ElectroShear® offers the superior heatdissipation and performanceneeded to eliminate machinedowntime.
Industries Served
• Automotive • Mineral Processing
• Aggregates • Mining
• Cement • Oil & Gas
• Coal • Packaging
• Energy • Plastics
• Food Processing • Power
• Forest Products • Rail
• Lumber • Rubber
• Marine • Steel
Electro Shear ® Applications
• Cranes & Hoists • Conveyors
• Winches • Material Handling Equipment
• Constant Tension Winches • Bulk Material Handling
• Rotary Coal Samplers • Machine Tools
• Palletizers • Transfer Equipment
• Jet Ways • Cement Block Equipment
• Electric Motors • Tire Forming Equipment
• Dock & Pier Handling • Barge Haulers• Equipment •
Mineral ProcessingMineral Processing
Conveyor SystemsConveyor Systems
Cranes & HoistsCranes & Hoists
3
Electro Shear ® Oil Shear Motor Brakes
Model 8725 – Standard Detroit Hoist** Application
Based on Job Site Studies and Application Case Studies.
Oil Shear Operation
Electro Shear® brakes are spring applied, electricallyreleased, multiple disc “Oil Shear” brakes. The brake discstack is immersed in a bath of oil, totally enclosed againstmoisture and contamination.
Electro Shear® brakes stop the machine load by theshearing of an oil film between alternating which results invirtually No Wear On The Friction Disc Surfaces.
The unit is self contained, totally enclosed and utilizesadvanced composite friction material discs with steelalternating discs.
Superior Heat Dissipation
The Electro Shear® brake has a well designed, castaluminum housing that allows for excellent heat dissipation.A continuous oil flow through the disc stack, cools andlubricates discs allowing the heat build up fromengagement to dissipate through the cast aluminumhousing.
Totally Enclosed System
Midwest Brake® is the only company that offers a totallyencapsulated AC coil design. This design, coupled with thetotally enclosed cast aluminum housing make the brakeimpervious to outside contaminates, dirt, coolant and water.This increases the life of the brake and leads to years ofmaintenance free operation.
Exceptionally Long Disc Stack Life
The inertia of the machine isstopped by the shearing ofan oil film between thealternating paper and steeldiscs. These discs do notcontact until over 90 percentof the inertia is absorbed.
This leads to exceptionallylong disc stack life. Staticand dynamic torque ratiosare nearly the same,resulting in fast, smoothstops.
Torque Ratings
Electro Shear® brakes achievetorque through springpressure and active frictionsurfaces. The torque ratingof each brake model can bevaried to meet specificmachine requirements byrearranging the disc stackand/or substituting heavier/lighter springs. If needed,brakes can easily be modifiedat the factory or in the field.
10
9
8
7
6
5
4
3
2
1
0Dry FrictionDisc Brakes
Electro-ShearBrakes
Brak
e Li
fe
4
Electro Shear ® Oil Shear Motor Brakes
A.C. Coil Assembly
Application RatedBrake Disc Stack
Spring Set Actuator
Cast Aluminum Housing
Viton Oil Seals
Blind or ThruHub-Spline and
Keyway Mounting
Fully Retained Hub
Manual Release w/Auto Reset
Ultimate SimplicityFast Response Time
The precision and speed of the 3-phase alternating coilmeans fast response time and the most accuraterepeatability of any machine brake. The Electro Shear® ACcoils are extremely efficient, low inertia and provide thefastest response time, typically 10 milliseconds. Forsuper critical applications improve response time to 1/100of a second.
Precise, Smooth Stopping
Oil Shear technology, inherently, offers smooth, precisestopping power consistently over the life of the brake. Thefriction disc linings do not fade with temperature and sincethe unit is completely sealed, ambient conditions do notaffect torque. Stopping times of 10 – 40 milliseconds canbe achieved, this will vary dependent on applications.
No Adjustment Needed
Electro Shear® brakes are spring set, multiple disc, selfadjusting brakes. The advanced composite friction materialis designed to minimize disc stack surface wear andrequires no adjustment.
Fail Safe Braking
Electro Shear® brakes are set by multiple springs andreleased by either a 230, 415, 460, 575 volt AC coil. Whencurrent is not present, the brake is engaged by the multiplesprings making act as a fail safe brake.
Simple Installation,One Piece Assembly
Electro Shear® brakes are easily installed on the rear C-flange of a NEMA standard motor. They are shipped fromthe factory completely assembled and are installed in one,integral piece – No Loose Pieces, No Assembly Required.
Installation can be performed quickly and easily in amanner of minutes. Simply secure the brake using theMidwest Brake supplied bolts, make the electricalconnections to the AC power source as per the servicemanual, fill with Type F automatic transmission fluid andthe brake is ready for operation.
Electro Shear® is easily fit to accommodate custommounting configurations including gear boxes, metricmotors, double c-face applications, thru shaft applicationsand many others. Please contact your Midwest Brakerepresentative for application assistance.
Operating Principle
Three phase, alternating electric current is applied, theactuator is pulled by the energized electromagnetic coilwhich overcomes the spring pressure. The friction discsare allowed to rotate freely. When the electrical power tothe coil is interrupted, the spring pressure mechanicallyforces the actuator to clamp the disc stack. This developstorque to stop or hold the load.
Step 1 – Remove Old Brake Step 2 – Slide Brake on Motor Shaft
Step 3 – Fill Brake Using Type F Fluid Step 4 – Wire Brake to Motor
Electro Shear ® – 8 Standard Sizes
Electro Shear® Model 8749Max Torque 1750 Lb-ft
Electro Shear® Model 8739Max Torque 900 Lb-ft
Electro Shear® Model 8729Max Torque 597 Lb-ft
5
Electro Shear ® Oil Shear Motor Brakes
Electro Shear ® Features
• 8 Standard Sizes - Torque Range Up To 1750 Lb-ft
• Electric A.C. Power – 230 VAC, 460 VAC, 575 VAC
• NEMA Motor Standard Mounting Designs
- 56 C Frame – 449T Frame- T-Frame Motors- U-Frame Motors
• IEC Motors
• Simple & Easy One Piece Installation
• Spring Set, Fail Safe Brake
• Cast Aluminum Housing
• Self Adjusting
• Horizontal or Vertical Mounting
• Manual Release
Mounting Easily Customized
• Optional Custom Bores
- Thru Shaft- Metric Bores- Tapered Shafts- Stepped Shafts- Splined Shafts
• Encoder Mounting – External For Easy Access
• Proximity Switch / Brake Release
• Foot Mounted Designs
• Glass Sight Gauge Optional
Foot Mounted Brakes
Electro Shear® Model 8727 – Foot Mounted Bracket Installations
6
Electro Shear ® Oil Shear Motor Brakes
Electro Shear® Model 8728Max Torque 486 Lb-ft
Electro Shear® Model 8727Max Torque 253 Lb-ft
Electro Shear® Model 8722Max Torque 25 Lb-ft
Electro Shear® Model 8725Max Torque 119 Lb-ft
Electro Shear® Model 8724Max Torque 68 Lb-ft
Electro Shear® Brakes Can AccomodateThru Shafts For Encoder Mounting
Electro Shear® Can Be Provided WithIntegral Shaft Extension For Encoder Mounting
Midwest Brake® ProvidesCustom Bracket Designs
Thru Shaft Brakes Encoder Brakes Foot Mounted Brakes
Electro Shear® Model 8725 – 25 Ton Overhead Hoist Installation
Double C Face Brakes Gear Box Mounted Brakes
7
Electro Shear ® Oil Shear Motor Brakes
Electro Shear ® Brakes For Constant Tension Winches
Model 8725 – Slide Adjustment Motor Installation
Automotive Body Lift
Electro Shear ® Brakes For:
• Coal & Mining Applications
• Material Handling Equipment
• Conveyors
Slide Adjustment Motor
Model 8729 Installed on an Automotive Body Lift Application
8
Electro Shear ® Oil Shear Motor Brakes
Electro Shear ® Brakes Rail Bridge Applications
Use Electro Shear® brakes for RailBridge applications. Brake shownwith foot mounted bracket andproximity switch for brake releasefeedback.
Model 8727 For A Bridge Application
*THE LISTED TRADEMARKS ARE REGISTERED OR UNREGISTERED TRADEMARKS OF THEIR RESPECTIVE OWNERS.ELECTRO SHEAR IS A REGISTERED TRADEMARK OF MIDWEST BRAKE CORPORATION.
Model 8722 – Concrete Block Machine Application
9
Electro Shear ® BrakesFor Overhead Crane &Hoist Applications
Model 8725 Installed on a Low Head* Overhead Crane Application Model 8725 Installed on a Mono Rail Detroit Hoist* Application
*THE LISTED TRADEMARKS ARE REGISTERED OR UNREGISTERED TRADEMARKS OF THEIR RESPECTIVE OWNERS.ELECTRO SHEAR IS A REGISTERED TRADEMARK OF MIDWEST BRAKE CORPORATION.
Electro Shear ® Oil Shear Motor Brakes
Installations*
• Detroit Hoist
• Electro Lift
• Whiting Crane
• R & M Crane
• Low Head Hoists
• Kone
• Yale
• Hepburg
• Michigan Crane
• Lesco
• Kranco
• Acco
• Jaso
• Zenar
• American Monorail
• Shepard Niles
• Shaw-Box Cranes
• Street Crane
• Ace World
• P&H Crane
Model 8725 Installed on a Trolley Application Model 8725 Installed on a R&M* Gearbox D-8 Type Application
Model 8727 – R&M* D-11 Installation
10
Electro Shear ® Oil Shear Motor Brakes
Electro Shear® Model 8725 & Model 8724 – 25 Ton Overhead Crane Application – Electro Shear® Brakes Installed On Site At Midwest Brake®
Material Handling Applications
Whether it is an overhead hoist or portal crane application,Midwest Brake® has the Oil Shear Brake solution. ElectroShear® easily mounts to gear box applications and hoists,indoor or outdoor. We have installed thousands of brakesin both retrofit and new equipment installations.
• Fast, Simple Installation
• One Piece Assembly
• No Loose Pieces
• Nema, Gear Box and Foot Mount
Electro Shear ® Brakes For Machine Tool Applications
Model 8725 – Buhr* Feed Drive Installation
Model 8765 – Lamb* Mechanical Feed Drive Installations
Model 8766 – Lamb* Mechanical Feed Drive Installation
9800 Series Double “D” Flange Brake I.E.C. Motor on Tap Head Application
11
Electro Shear ® Oil Shear Motor Brakes
Model 8766 – Lamb* Slide Installations(Generation One Brakes In Operation Since 1987)
• Lamb
• Thyssen
• Buhr
• LaSalle
• Gehring
• Cross Huller
• Kingsbury
• Ingersoll
• Fellows
• R & B
• Ex-Cell-O
• Greenlee
• Comau
• Gidding & Lewis
• Oloffsson
12
Electro Shear ® Oil Shear Motor Brakes
Oil Shear Principle
Electro Shear® brakes transmit torque through the shearingof oil molecules between alternating paper friction discsand steel wear discs. The viscous shearing of the oil(automatic transmission fluid) dissipates the heatgenerated from the operation of the Electro Shear® and iscarried away by the continuous circulation of the oil.
The oil shear principle is the primary reason oil shearbrakes offer extremely long service life and superiorreliability.
Operation of the Electro Shear® brakebegins with an oil film which is made up ofmultiple oil molecules. Molecules of oil areattracted to one another, giving oil definedviscosity.
The Electro Shear® brakes contains astack of alternating discs. The ElectroShear® utilizes advanced compositesintered bronze friction discs and steeldisc wear plates.
The Electro Shear® brake maintains a filmof oil between the friction surfaces,through which torque is transferred.
As the friction discs begin to rotate, theopposing drive cuts across the film of oilmolecules.
Oil molecules ride on and between thefriction discs and act like small hydrodynamic bearings.
The kinetic energy (heat) generatedduring operation of the Electro Shear®
brake is carried away by the continuouscirculation of the oil molecules.
Electro Shear® brakes incorporate a true oil shear into thedesign where the friction discs are continuously floodedwith oil to continually lubricate and cool friction discsurfaces. A true oil shear actually cuts across the film of oilmolecules that is maintained between the alternating discsurfaces.
The oil itself acts as efficient power transmission medium,which relieves the mechanical friction surfaces of much ofthe work. The oil effectively absorbs and dissipates heat
13
Electro Shear ® Oil Shear Motor Brakes
POSITION NUMBER 1, 2, 3, 4
87228724872587278728872987398749
POSITION NUMBER 6 & 7
04 = 4.50 Pilot08 = 8.50 Pilot10 = 10.50 Pilot12 = 12.50 Pilot16 = 16.00 Pilot
POSITION NUMBER8
T = ThruO = No Thru
POSITION NUMBER 11,11, 12, 13
063=5/8 Bore075=3/4 Bore138=1-3/8 Boreetc.
POSITIONNUMBER14,14, 15, 16, 17
Torques
POSITION NUMBER9
1 = 460V AC (60Hz)2 = 230V AC (60Hz)4 = 415V AC (50Hz)5 = 575V AC (60Hz)
POSITION NUMBER10
1 = Nipple2 = 6ft. Cord3 = 8ft .Cord4 = 10ft .Cord5 = 12ft. Cord
POSITION NUMBER5
H = HorizontalT = Vertical
TopB = Vertical
Bottom
• OPTIONS INCLUDE: ENCODER BRAKE MOUNTINGPROXIMITY SWITCHTHRU SHAFTFOOT MOUNTDOUBLE C FACE
**SPECIAL UNIT – CONSULT FACTORY
MODEL MODEL MODEL MODEL MODEL MODEL MODEL MODEL8722 8724 8725 8727 8728 8729 8739 8749
003.1 007.0 019.0 063.0 146.0 120.0 181.0 350.0006.0 013.0 024.0 076.0 183.0 150.0 226.0 437.0009.1 020.0 036.0 088.0 220.0 168.0 272.0 525.0012.7 028.0 048.0 101.0 257.0 180.0 317.0 612.0018.0 035.0 060.0 113.0 293.0 210.0 362.0 700.0
025.0** 041.0 073.0 127.0 330.0 240.0 408.0 788.0049.0 085.0 135.0 367.0 252.0 453.0 875.0059.0 101.0 152.0 385.0 270.0 507.0 978.0068.0 119.0 168.0 427.0 294.0 570.0 1101.0
189.0 486.0 301.0 633.0 1223.0203.0 336.0 721.0 1392.0211.0 358.0 811.0 1566.0228.0 378.0 901.0 1740.0253.0 420.0
478.0537.0597.0
NOTE: TO INSURE PROPER APPLICATION, PLEASE CONTACT MIDWEST BRAKEFOR FINAL APPROVAL OF MODEL NUMBER AND TORQUE REQUIREMENTS.
Available Torques (Lb-ft)
•
MODELNUMBER MOUNTING
POSITIONHOUSINGPILOT
THRU/NO THRU(SHAFT) VOLTAGE
TORQUE
HUBBORE
CONNECTORCORD
1 2 3 4 5 6 7 8 9 10 11 12 1613 14 15 17
To Select Electro-Shear ® Brakes Use the Following Table
14
Electro Shear ® Oil Shear Motor Brakes
Electro Shear ® Technical Specifications
Electro Shear ® Motor Frame Chart
Model 56 143 145 182 213 215 254 256 284 286 324 326 364 365 405 445 449
8722 x x x
8724 x x x
8725 x x x x
8727 x x x x x x
8278 x x x x x x x x
8729 x x x x x
8739 x x x
8749 x x x
Model Min Bore Max Bore AllowableShaft Length
Min TorqueLb-ft
Max TorqueLb-ft
WeightLbs
8722 0.625 1.375 2.500 3.1 25 15
8724 0.875 1.875 2.75* 7 68 38
8725 1.125 1.875 3.75 19 119 60
8727 1.125 1.875 4.630 63 253 92
8278 1.375 2.625 6.000 146 486 120
8729 1.625 2.625 6.250 120 597 120
8739 1.625 3.625 6.875 181 901 175
8749 1.625 4.250 8.688 350 1740 200
Torque Lb-ft = Motor HP x 5250 x 1.5RPM
Service Factor = 1.5
15
Non-Standard Motor Mounting Dimensions
“C’FACE” DIA.
STEP - YES OR NO(3 PLACE DIM.)
(3 PLACE DIM.)
KEYWAYKeyway
(3 Place Dim.)
“C Face” Dia.
Step – Yes or No (3 Place Dim.)
THREADAND
DEPTH
XOXo
Thread and Depth
FRAME FU Fa FAH FAK FAJ FBF & DP
56(SEE NOTE)
143T145T
182T184T
213T215T
254T256T
284T286T
324T326T
364T365T
404T405T
182U184U
213U215U
254U256U
284U286U
324U326U
364U365U
404U405U
.6250
.6245
.8750
.8745
.6250
.6245
.8750
.8745
1.12501.1245
1.37501.3745
1.6251.624
1.8751.874
1.8751.874
2.1252.124
.8750
.8745
.8750
.8745
1.12501.1245
1.37501.3745
1.6251.624
1.8751.874
2.1252.124
3/16
3/16
3/16
1/4
5/16
3/8
1/2
1/2
1/2
3/16
3/16
1/4
5/16
3/8
1/2
1/2
1.500TO
2.063
1.500
2.125
2.500
3.125
3.750
4.375
4.375
5.000
2.125
2.000
2.750
3.500
4.625
5.375
6.125
4.500
4.500
8.500
8.500
8.500
10.500
12.500
12.500
12.500
4.500
8.500
8.500
10.500
12.500
12.500
12.500
5.875
5.875
7.250
7.250
7.250
9.000
11.000
11.000
11.000
5.875
7.250
7.250
9.000
11.000
11.000
11.000
3/8-16.56 DP.
3/8-16.56 DP.
1/2-13.75 DP.
1/2-13.75 DP.
1/2-13.75 DP
1/2-13.75 DP
5/8-11.94 DP.
5/8-11.94 DP
5/8-11.94 DP
3/8-16.81 DP.
1/2-13.75 DP.
1/2-13.75 DP.
1/2-13.75 DP.
5/8-11.94 DP.
5/8-11.94 DP.
5/8-11.94 DP.
FBF&
DP
FA
45O
FAKMOUNTING
FACE
FAH
Fa
FU
45o
FAJ
FAK
FAH
FU
Fa
MountingFace
FBF & DP(4 Holes)
56 Frame Note: Variation of FU and FAH dimensions are dependent onmotor horsepower and R.P. M.
Electro Shear ® Oil Shear Motor Brakes
Standard Motor Mounting Dimensions
16
Definitions of Mounting Positions
Horizontal Mount
Vertical Top Mount Vertical Bottom Mount
Motor
Drive End
Motor Motor
Drive End
Drive End
Envelope Dimensions
B
Mot
or
A
C
D
B
Mot
or
A
C
D
8729
14.38
8.25
8.19
10.12
8739
17.25
8.625
9.625
11.625
8749
20.00
10.375
11.00
13.00
8728
14.38
5.50
8.25
10.12
8727
14.38
6.06
7.88
8.08
MODEL
8724
9.31
5.00
4.75
7.00
A
B
C
D
DIMENSIONMODEL
8722
7.00
5.03
4.73
5.88
A
B
C
D
DIMENSION
Electro Shear ® Oil Shear Motor Brakes
Certified Drawings Available on Request.
8725
11.88
6.13
6.19
6.96
17
Company
Address
City State Zip
Contact Title
Phone Fax
Crane Manufacturer*
Brake Location* What is the Voltage of the Crane? Does the Crane have a Load Brake?
■■ Hoist ■■ Bridge ■■ Trolley ■■ 200V ■■ 230V ■■ 460V ■■ 575V ■■ Yes ■■ No
Brake Manufacturer Brake Model Number
Brake Serial Number Brake Mounting Position
Brake Mounting Position
■■ Horizontal ■■ Vertical
Is Brake Mounted on Motor?
■■ Yes ■■ No
Motor Manufacture Motor Frame (Include Letters)
Motor Horsepower Motor R.P.M.
Motor Model Number
Does Motor Face Have C-Face on Opposite to the Drive End?
■■ Yes ■■ No
Is Brake Mounted on a Gear Box?
■■ Yes ■■ No
Gearbox Manufacturer Gearbox Model Number
Other Mounting Information:
What is the Mounting Bolt Circle? (See Fig. 3) What is the Bolt Size? (See Fig. 3)
What is the Shaft Diameter? (See Fig. 2) Does the Shaft have Steps on it? (See Fig. 2)
Does the Shaft Extend Thru the Brake? What is the Keyway Size? (See Fig. 2)
If Brake is Mounted to Spline Shaft What is the Number of Teeth? (Sample Hub or Shaft Required for Measurement)
What is the Length of the Shaft Extension for the Mounting Surface? (See Fig 2)
Will Any Part of the Application Limit or Interfere with an Electro Shear® Application?
Electro Shear ® Application Data Sheet Information Needed For Quotation
* Required Information
Electro Shear ® Oil Shear Motor Brakes
18
Electro Shear ® Mounting Dimensions
FAKMOUNTING
FACE
FAH
Fa
FU
“C’FACE” DIA.
STEP - YES OR NO(3 PLACE DIM.)
(3 PLACE DIM.)
KEYWAY
A
B
THREADAND
DEPTH
XO
D
GEAR BOX
MOTOR
C
E
Xo
Thread and Depth
Keyway
3 Place Dim.)
“C Face” Dia.
Step - Yes or No(3 Place Dim.)
FAK
FAH
FU
Fa
Mounting Face
Motor
Gearbox
E
C
A
B
D
Figure 1
Figure 3 Figure 4
Figure 5
Note: When ordering gearboxstyle Electro Shear ® please notethe number of teeth.
Figure 2
Customer Notes and Comments:
Electro Shear ® Oil Shear Motor Brakes
BULLETIN NO. ESB-001 ©COPYRIGHT 2007 - MIDWEST BRAKE
®
26255 Groesbeck Hwy.Warren, MI 48089 U.S.A.
586.775.3000 • 586.775.3040 (Fax)800.525.4503 (Toll Free)www.midwestbrake.com
[email protected] (E-mail)