INVERTED TOOTH Chains and Sprockets - Accent Bearings

1 INVERTED TOOTHC hains and SprocketsFOR POWER TRANSMISSIONR amsey Silent ChainsFor Power TransmissionRamsey Products specializes in the design, manufacture,and application of silent chain drives, also known as INVERTED TOOTH or toothed chain drives. For more than 80years this has been our focus, and today we remain committed to providing our customers with the world'swidest range of top quality silent chain we specialize in silent chain , we understand howimportant it is to choose the right chain and Sprockets foreach application. Whether selecting components for a newapplication, replacing an existing chain , or custom designing a chain , our goal is to provide our customers withthe most practical and cost effective solutions. If a job canbe done with silent chain , we will help find the best chainfor the job, at the lowest possible companies sell silent chain , but no one offers theproduct range, quality, and support provided by Ramsey.

2 Inaddition to our extensive standard product line, we offerreplacements for most competitors' Chains , as well as custom designed Chains . We also provide free consultationand drive selection assistance through our staff of experienced designers. Whether your requirement is a singlechain, or a much larger volume, our sales and engineeringstaff has the experience to assist you. With warehouses andrepresentatives around the world, we welcome the opportunity to serve THIS CATALOGR amsey manufactures three different silent chain productlines for general power transmission. Each has uniquefeatures and advantages:RPV seriesRPV chain and Sprockets are high performance productsoffering maximum speed and power handling is usually the choice for challenging applications,particularly where space is limited and power or speedrequirements exceed the capacity of other seriesRP or RamPower silent chain provides approximately twotimes the power capacity of standard silent chain .

3 RPchain operates on Sprockets having an ASME Standardtooth profile and is well suited for new or seriesSC silent chain and Sprockets are manufactured to comply with the ASME Standard for silent chain . SCproducts have been around the longest, are used primarily in replacement applications, and are often themost of the products listed in this catalogare successfully employed in applicationsother than power transmission. For additional information regarding othersilent chain applications, such as conveying,or for details on specialty silent chain products, please call Ramsey or visit our website: chain 15-21 Ordering 29 Service 30 Maintenance and SILENT chain ?Silent chain offers today s drive designer unique advantages and options for transmitting powersmoothly, efficiently, and economically.

4 Capable oftransmitting loads and speeds that exceed the capacityof all other Chains and belts, silent chain providesproven technology that is found in applicationsthroughout modern industry. Silent chain also produces very little vibration or noise, and operates atefficiencies as high as 99%. Add to these features awide range of standard chain and sprocket sizes andthe result is an extremely flexible and powerful systemfor power transmission. Silent chain Drives compared with higher speeds and power capacity efficiency ratios possible slippage heavier overloads drive ratios at short center distances affected by temperature or humidity bearing loads and therefore more easily installed in oil filled gear boxes Silent chain Drives compared with roller higher speeds and power quieter power more smoothly, less impact load during sprocket engagement efficiency (as high as 99%)

5 sprocket life Silent chain Drives compared with than spur gears distance much less restricted parallelism tolerances are broader bearing loads end thrust as with helical gears elasticity to absorb shock chain CONSTRUCTIONR amsey silent Chains are made from hardened alloysteel components consisting of flat TOOTH shaped driving links, guide links and pins that form the chainjoint. The driving links engage sprocket teeth muchthe way a rack and pinion mesh. guide links serve toretain the chain on Sprockets and pins hold the jointtogether and allow the chain to LinksDriving links, also known as plainlinks, engage sprocket teeth withless sliding and less impact thanother types of chain . This results inquieter operation and longersprocket life. Reduced impact loading also allows for higher operating LinksGuide links maintain proper tracking of the chain on can be positioned on theouter edges of the chain in sideguide or nearer to the middle ofthe chain with center guide .

6 Widerchains will often have two rows of center guide links,commonly referred to as two center and JointsRPV, RP, and SC Chains use highly specialized two-pinjoints that have been developed to maximize chainload and speed capacity, while reducing friction andwear. RPV and RP use case hardened "crescent" shapedpins, while SC Chains contain the original "D" shapedRamsey pin profile, also case hardened for maximumwear resistance. The one exception is SC 3/16" pitchchain, which due to relatively light loading, is produced with a single pin chain joint with D shaped pinsRPV and RP chain joint with Crescent shaped pins3 Silent chain FundamentalsHOW TWO PIN JOINTS WORKThis figure shows how the Ramsey two pin joint works. As a chain engages the sprocket , and moves from position A to position B, the convex surfaced pins roll upon one another.

7 This rolling action eliminates the slidingfriction and galling that occurs in other types of chain . Pin action also minimizes the effects of chordal action byslightly increasing chain pitch and internally moving the pitch point up to coincide with the Sprockets pitch circle. As a result, the chain smoothly and efficiently engages the sprocket , very nearly tangent to the pitch smoothness and lack of vibration results in a quiet drive with higher load and speed of chain travelChain guide TypeChain guide type describes the placement of guide links within the chain . The most common guide types are,one center guide , two center guide , and side GuideOne Center GuideTwo Center GuideRamsey Two Pin JointABA Ramsey Silent chain operating at high speed. Note thesmoothness and lack of for mobile power supplyTransfer case for glass bottle take out armMain drive on plastic film extruderDiesel powered highway snow blowerCentrifugal blower drive5 RPV SERIES CHAINRPV is high performance INVERTED TOOTH chain , specificallydesigned to meet or exceed the capability of all other high performance Chains .

8 RPV is capable of speeds in excess of 7000 fpm and loads exceeding 3000 's strength and load capacity comes from improved link andsprocket designs. Links are designed to minimize stress concentrations and to increase the amount of steel in the line ofchain pull. Innovative stamping methods maximize the amountof load bearing surface in each link and greatly reduce the rateof chain elongation during operation. All links are shot peenedto improve fatigue strength and produce a uniform, highquality Sprockets employ an involute TOOTH profile todecrease impact loading and vibration during chainengagement. RPV chain engages Sprockets nearly tangent to the sprocket pitch circle, reducing the velocityvariation produced by chordal action. Reduced velocityvariation creates less vibration and translates directly toless wasted energy and higher load carrying Performance Silent ChainThick WaistShot PeenedFull RadiusShaved ApertureSpecial Two Pin Joint2000400060004080120160200 RPMHORSEPOWER CAPACITY Power ratings are based on 33 TOOTH sprocketsRPV404#40 Roller chainToothed belt14mm x 25mm circleSprocket rotationOther chain widths are availableUnless indicated, all dimensions are in inches3/4 and 1 pitch is also available in Type 115 link style1 1/2 and 2 Pitch3/8 through 1 PitchRPV Side guide AssembliesWidth Width Width WidthBetween Over OverAtBreakingPitch Part Nominal Guides Heads Links Connector Weight LoadhdtNumber Width WBGWHWLWC (Lbs/ft) (Lbf)

9 RPV3033 ,000 RPV3041 ,0003/8" RPV3061 1 , ,000 RPV3123 ,000 RPV4041 ,000 RPV4061 1 ,5001/2" RPV4082 , ,000 RPV4164 ,000 RPV6061 1 ,750 RPV6082 ,000 RPV6123 , " RPV6164 ,000 RPV6205 , , ,0001 , , ,000 RPV12123 ,0001-1/2" RPV12164 , ,000 RPV12246 ,000 RPV16164 ,0002"RPV16205 , ,000 RPV16328 ,000 PitchhdWHWLWBGWCtWCtWBGWLWHhPitchdType 139 Type 1156 RPVC enter guide Assemblies3/8 through 1 PitchOther chain widths are availableUnless indicated, all dimensions are in inches3/4 and 1 pitch is also available in Tupe 115 link styleWidth Width WidthOverOverAtBreakingPitchPart Nominal Heads Links Connector Weight LoadhdtNumber WidthWHWLWC (Lbs/ft) (Lbf) , ,6003/8" , , , , , ,6001/2" , , , , , ,4003/4" , , , , , , ,2001" , , , ,800 RPV Center guide AssembliesWCtWLWHhdPitch7 Type 139 Type 1153/4 through 2 PitchPitchhdRPRamPower Silent ChainRP SERIES CHAINRP or RamPower series silent chain was designed to operate on Sprockets manufactured with an ASMES tandard TOOTH profile.

10 Available exclusively through Ramsey, RamPower offers twice the power capacityof SC series Chains and speeds up to 7,000 fpm. RamPower has been successfullyemployed in applications transmitting up to 2,500 hp and is oftenpreferred where high loads and speeds must be accommodated ina small amount of space. The increased load carrying capacity of RamPower is a result ofimproved link and pin designs. Working with independent laboratories, Ramsey engineers re-designed the standard SC linkshape to reduce stress concentrations, improve fatigue life, andincrease link tensile strength. Innovative stamping methods werealso employed to maximize the amount of bearing surface area ineach link. The increased bearing area produces less stress in thechain joint and greatly reduces the rate of chain elongation duringoperation.