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Split block installation and trouble shooting 2011Presentation Transcript
P.T. International Corp. Metric & American Standard Power Transmission Products Global Production Broad Euro Product Range Global Markets Prefer Metric - Easier to Source Spare Parts
Mounted Bearings, Drive Products &European Linear Components
P.T. International Corp.Headquartered in Charlotte NC80,000 Ft² - 25,000 SKU’sGlobal Manufacturing &SourcingEngineering and DesignCapabilitiesSales Reps in US, Canada andEuropeISO 9001:2008 Certified
Inspection & Warehouse Shaft Center Height PTI WarehouseBore Measurementwith Sylvac Digital Go/No Go Gauges, Instruments Thread Gauges & Taper Bore Gauges
Mounted Roller Bearings SAFS/SDAF Split Pillow Blocks thru 21” Shaft Diameter and Multiple Seal Options SN/SD Split Plummer Blocks thru 400mm Bores in stock
Standard Split Block Components Tapered Spherical Split Housing Tapered Adapter BearingLER Triple Labyrinth Seal Fixing Ring Lock Nut Lock Washer or Clip
Optional ComponentsHydraulic Adapter PER Seals End Cover Taconite Lock Nut with w/ O-ring Seal Mounting ScrewsHydraulic Nut (Tool) LER-DC Dust Cover PTV Seal for PER
Introduction – Housing Features Optional Oil Sight Glass Large Lube Plugs/Drains & FaceOptional Temp. Strip (cross-port drilled) Grooves for Dust Cover SealMatched Cap & Base, Offset Dowel for Solid Base for Strength & Large Pry Slots Proper Assembly and Oil Cross-port
SAF Complete Unit Nomenclature SAF 22528 x 4-15/16 Includes: SAF 528 Housing, Seals, and Fixing Ring 22228K C3 W33 Spherical Bearing K = Tapered Bore C3 = Internal Clearance W33 Lube groove on OD of Bearing SNW 28 x 4-15/16 Adapter (or H3128 x 4-15/16) SNW = Sleeve, Nut, Washer – Inch Treads (H=Metric Thds.)
SAF Housing Nomenclature SAF – Cast Iron Housing (Std U.S.) SAFD – Ductile Housing (Std Canada) SAFS – Steel Housing FSAF – Standard Four Bolt Base SAF 509 to SAF511 - 2 Bolt Base (Housing Only_ SAF513 to SAF520 - 2 Bolt Base FSAF 513 to FSAF 520 - 4 Bolt Bases SAF 522 & Up - 4 Bolt Bases only Bearing Nomenclature: Last 2 digits x 5 = Bore in mm.
Shaft and Housing Fits Installation1. SAF Blocks have Clearance fits, Typically H8 to allow the bearing to float within the housing Housing for expansion.2. Each shaft requires 1 fixed bearing and 1 bearing to float to handle expansion.3. Typical fit to the shaft is 0.0005” interference per inch of shaft diameter. Shaft
Documentation - Measure & Record theUn-mounted Internal Bearing Clearance Installation1. On free standing SphericalBearings, the clearance is at the topbetween roller and outer race. 2. For Spherical Bearings hanging free on a shaft, the clearance is between the lowest roller and inner race, but difficult to measure there. So carefully measure between the roller and outer race.3. Document measurements for future reference.
Mounting Concept:Tapered bore bearings mount to theshaft with a matching taperedadapter. As the adapter nut istightened, the bearing inner ring isforced up the taper gripping the shaft. The inner ring is expanding due toaxial movement up the taper, whichremoves internal clearance from thebearing. The result is a press fit ontothe shaft.
Spanner Wrench Mounting2. Hand Tighten Nut without Lockwasher3. Do not use hammer and drift. The drift will severely damage the nut4. Use a spanner wrench and hammer. This method will only work for smaller shaft diameters.5. For larger shaft sizes, use Hydraulic Nut or Micro - mount screw method.
Mounting with Hydraulic NutAs an option the bearing can also bemounted with the help of a hydraulic nut.This is especially helpful for large diameterunits. Pressure from the piston within thenut presses the bearing inner ring up thetapered adapter, expanding the inner ringslightly. Axial movement of the bearingand clearance removed during the processcan be measured.As the final internal clearance is achieved,release the pressure and remove theHydraulic nut, Replace it with the standardnut and washer or locking clip.
Mounting with Hydraulic Nut Spherical Bering with Tapered Bore Hydraulic Pressure Inlet Tapered Hydraulic Adapter Nut Piston of Hydraulic Nut presses on Bearing Inner Ring
Mounting with Hydraulic Nut (cont’d)Once the Hydraulic nut 1. Re-install Nut & Lockwasher.has been removed, installthe lockwasher andtighten the standard nut.Once tight, bend the most 2. Tighten Nut.convenient tang of thewasher into the slot onthe OD of the nut. Thisacts as a lock washer.Larger units use a locking 3. Bend washer tang orclip. install lockingDo not drive the bearing further up the taper! clip.
Tips for Measuring the ClearanceDuring installation of the bearing, which is likelyhanging on the shaft, it may be very helpful tosling the bearing, shifting the internal clearanceto the top where clearance is easier to measure.As a comparison, clearance measure on thebottom should be the same as that measured onthe top. Due to the weight of the rollers andsliding the feeler gauge under the roller,clearances tend to be a little more difficult andtend to read less than on the top. Practice willminimize the differences. Clearance can bemeasured on each side for verification.Note: Do not roll the bearing over the feeler gauge inan attempt to measure the clearance. This will notyield an accurate result of clearance!
More Tips when Measuring….BEARING As a measurement suggestion and prior to each measurement, roll the bearing to center rollers for measurement. A helpful tip is to lightly press the roller inward with your thumb, i.e…. toward the center of the bearing, so it remains stable. This also creates a consistent measurement technique. Make sure the feeler gauge passes over the top of the roller and not the edge. A light saw-tooth action will help the feeler to pass. The roller is crowned so the measurement at the edge will be slightly larger than at the center. Measure clearance with feeler gauge over the center of the roller. Document the measurements for order documentation.
Example: SAF 22528 x 4-15/16, Bearing 22228K C3 W33, (Bore 140mm)
Example: SAF22528 x 4-15/16 Bearing 22228 K C3Pressure: 339 psiClearance Reduction 0.025” min.Axial Drive Up:0.0317”Measure To Be Sure!
Optional Mounting Method…. InstallationAdapter Nut with Mounting Screws Tighten Oval Point Set Screws using a torque wrench pressing on the bearing inner ring, removing the clearance as torque increases. Measuring clearance at each torque interval.
Housing, Seals and LubeBEARING Once the bearing has been properly tightened and the final running clearance documented, housing assembly can begin. Position the seals so they align with the housing and lower the bearing into the housing. The seals should fit into the seal grooves. Hand pack the seal grooves in the housing base with grease. Also hand pack the bearing between all of the rollers with grease once the bearing is resting in the housing base. The base should then be filled 1/3 to 1/2 full as a guide. To assist final housing mounting, the fixing ring can be installed on either side of the bearing to help with base bolt hole positioning. One bearing must have the fixing ring, the other end should remain free to float (no fixing ring). Position the floating bearing in the center of the bearing area so it can expand or contract as needed.
InstallationBearing Removal and Reuse?1. Visually inspect the Spherical Roller Bearing for surface defects including brinelling, pits, staining, or graying of the races. See included defect chart.2. The Housing cost is usually less than the SRB, and seal grooves wear, inspect before re-use.3. Always replace the Adapter and Seals.4. In general, it is not advisable to re-use bearings.
Introduction – Housing FeaturesBEARING Optional Oil Sight Glass Large Lube Plugs/Drains & Face (cross-port drilled) Grooves for Dust Cover Seal Optional Temp. Strip Matched Cap & Base, Offset Dowel for Solid Base for Strength & Large Pry Slots Proper Assembly and Oil Cross-port
P.T. International Corp. SAF, SDAF & Metric Split Blocks Installation & General Training
Bearing Autopsy Installation1. Bearings are a systems flight recorder. Wear patterns on the races tell a story and provide helpful application information. Part: Outer ring of a spherical roller bearing2. When the shaft rotates, the history Symptom: Peeling occurs near the shoulder of the raceway over the entire circumference and on builds on the Outer race. the center of the rolling surfaces below Cause: Poor lubrication3. Careful inspection review of load zone, wear pattern, surface marks and discolorations will guide the user as to why the failure occurred.
Bearing Autopsy – Typical Problems 1 InstallationPart: Inner ring of a spherical Part: Outer ring of a sphericalroller bearing roller bearing Symptom: Creep occurs overSymptom: Creep accompanied entire circumference of outsideby scoring of bore surface surfaceCause: Insufficient interference Cause: Loose fit between outer ring and housing
Bearing Autopsy – Typical Problems 2 InstallationPart: Outer ring of a spherical roller Part: Outer ring of a Cylindricalbearing bearing Symptom: False brinelling occursSymptom: Wear having a wavy or on the racewayconcave-and-convex texture onloaded side of raceway surface Cause: Vibration from an external source while stationaryCause: Entry of debris underrepeated vibration while stationary
Bearing Autopsy – Typical Problems 3 InstallationPart: Inner ring of an angular Part: Outer ring in Photocontact ball bearing Symptom: Raceway discoloration,Symptom: Raceway discoloration, melting occurs at ball pitchmelting occurs at ball pitch intervalsintervals Cause: Excessive preloadCause: Excessive preload
Bearing Autopsy – Typical Problems 4 InstallationPart: Outer ring of Inner ring on Part: Inner ring of a spherical rollerRight bearingSymptom: Flaking of only one Symptom: Flaking of only oneraceway over its entire raceway over its entirecircumference circumferenceCause: Excessive axial load Cause: Excessive axial load
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