Sprag Clutch - Renold

1 Sprag ClutchOverrunning - Indexing - Backstopping2nd EditionFor more information telephone us on +44 (0) 29 20792737 or fax +44 (0) 29 20791360 E-Mail: Gears Works, Milnrow, Rochdale OL16 3LS EnglandTel:+44 (0) 1706 751000 Fax:+44 (0) 1706 751001E-Mail: helical and bevel - helical Speed Reducer gear Units,Geared Motor Units and Fully Engineered Drive Corporate Park, Newlands Road, Cardiff CF3 2 EUWalesTel:+44 (0) 29 20792737 Fax:+44 (0) 29 20793004(Sales): +44 (0) 29 20791360E-Mail: Couplings, Resilient gear and Fluid Soft-Start,Clutches: Sprag and Trapped Roller Freewheels, Slipping and Air & CouplingsContentsRENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: NoRenold Clutches & Couplings Company Profile5 Sprag Clutch General Specification6 Sprag Clutch Product Features7 Typical Applications8 Examples of Sprag Clutch Mounting Arrangements9 Pictorial Content Indexing - Overrunning - Backstopping10 - 11 Selection of Sprag Clutches - Ratings Table12 - 16SA Series Sprag Clutch17SB Series Sprag Clutch19SO/SX Series Sprag Clutch22 Stub Shaft Adaptors28 Sprag Clutch Flexible Couplings30DM Series Sprag Clutch34 Sprag Clutch Holdbacks37 Sprag Clutch Holdback - Selections38 Sprag Clutch Holdback - Applications39SH Series Sprag Clutch Holdbacks40 SLH Series Sprag Clutch Holdbacks42SH & SLH Series Sprag Clutch Bore Sizes44 Enhanced Seal Holdbacks46 Tension Release Mechanisms48 Torque Limited Sprag Clutch49 USA Bore & Shaft Sizes

2 And Tolerances50 Installation and Lubrication51 Renold Group Product Range52 - 53 Renold Worldwide Sales & Services54 Renold s Quality is inherent across its rangeof power transmission products, allowing youto select for individual applications orcombined engineered package Renold to keep your plant runningand design options Power Transmission SolutionWORM GEARSHELICAL GEARSBEVEL HELICALGEARSVARIABLE SPEEDFLEXIBLE COUPLINGSSPRAG CLUTCHESINDEXERSWITH HINDSIGHTYOU D FIT Renold ,WHY WAIT?WITH HINDSIGHTYOU D FIT Renold ,WHY WAIT?4 Renold Clutches & CouplingsRENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: was formed in 1964, a combination of JohnHolroyd & Co Ltd., of Milnrow and Croft Engineers Ltd of companies had their origins in the 1880 s and had beenmanufacturing gears and gear units of all kinds since the early 1900 Holroyd wormgear tooth profile used exclusively in all wormgears is based on standard with specialmodifications to give a very high gear tooth efficiency and loadcarrying a comprehensive range of productcomprising wormgear units, helical and bevel / helical gear units asspeed reducer and motorised units have foot and shaft mounted options with modular builddesign to allow combination of many of the product types.

3 Service Excellence and Careoffers a unique level of service excellence andcustomer care. Our experienced applications engineers willselect the optimum solution, with the aid of the latestcomputer and design technology. provides theservice and care for peace of Special Solutions and InnovationsGears is recognised throughout the industry for itscapability to create specific solutions to customer uniquerequirements, in a broad range of industries from foodprocessing to escalators to textile machinery and complete solutions, providing total capability in allmarket sectors not just for gear units, but also for completedrive packages. Leading Edge TechnologyValue through quality with continuous investment in people,process technology, manufacturing and commitment to quality,enables to provide the practical cost effectivesolutions to most power transmission problems.

4 Consistent Reliabilityhas years of experience in the design andmanufacture of its products to the highest specifications, used in a numerous variety of industries throughout the world, with proven performance, guaranteed quality andassurance of reliability. Package SolutionsOne stop for your drive systems including gears, motors,couplings, variators and fabricated bases. ApprovalGears is BS EN ISO 9001:2000approved. All products are designed andmanufactured to this Quality Assurance System. Local and InternationalThe organisation stretches worldwide with 16 National Sales Companies and more than 70 accrediteddistributors offering the comprehensive range ofpower transmission products and Clutch - General SpecificationRENOLD Clutches and Couplings.

5 Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: Sprag Clutch is a free-wheel device having an inner race, and an outer race either of which can be the input or output input member can be arranged to drive the output member in a chosen direction and permit the output member to over-run in the general, Sprag Clutches are able to transmit greater torques, within given overall dimensions, than other types of free-wheel simple form the Sprag Clutch consists of a full complement ofshaped steel sprags or wedges, located in the annular spacebetween concentric inner and outer races. Power is transmitted fromone race to the other by the wedging action of the sprags betweenthem. Each Sprag is so shaped that dimension AA is greater than of one race in the driving direction causes the sprags totilt, thus transmitting the torque in full from one race to the rotation of the race in the other direction frees thesprags and permits over-running between the - SX SeriesARO sprags are fitted into the SO and SX series of Sprag clutches upto size 700, and assist in resisting the effects of transient overloadsand Engagement Condition:Showing the ARO sprags in the drive locked position transmittingthe rated torque of the particular Overload Condition.

6 The projected shape at the side of each Sprag creates a positivesprag-to- Sprag abutment, which resists both rollover and tilting force F keeps the sprags in light contact with bothinner and outer races. There is thus no lost motion, the drivingtorque being instantaneously transmitted between spring arrangements are used to provide force F, atypical one being an expanding coil spring as shown in thediagram above. In any Clutch of this type, the transmittingcapacity must be dependent on the total load carrying area. TheRenold Sprag Clutch is so designed that the maximum possiblenumber of sprags can be accommodated; thus it will transmit agreater torque in relation to its size and weight than any othercomparable type of the Clutch is used as the sole failsafedevice in any application then otherfactors in the operating environmentsuch as improper use, lack of servicingmaintenance or lubrication may cause theclutch to fail causing danger to users,personnel and Sprag CLUTCHARO Sprag CLUTCHS prag Clutch - Product FeaturesRENOLD Clutches and Couplings.

7 Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: bearing general and special purpose clutchesLight Duty Sleeve Bearing ClutchHardened Sprag with a camprofile allowing formaximum roll over (ARO)hardened Sprags fitted toclutches up to size and ground outerrace allowing for maximumpower transmission with noloss of sleeve bearingcombining concentricityand long seal for lubricantretention allowingminimum duty bearing fittedfor maximum loadcapacity and long spring ensuring theSprags are in full contact at anymoment in time, eliminating allmotion used for oil filled clutches ormetal labyrinth plate fitted forgrease filled action retainer allowsfull positional control of thesprags for maximum loadsharing Labyrinthseal plateSprag Clutch - Typical ApplicationsRENOLD Clutches and Couplings.

8 Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: Sprag Clutch used as an overrunning device on a nip roll in asteelwork rolling mill. Speed overrun is often created by the steelbeing Clutch holdbacks are often used on inclined conveyorheadshaft drives to prevent runback in the event of a power Sprag Clutch backstop on an apron feel conveyor in an iron oremining plant in park rides are popular world wide, but safety is of majorimportance. Sprag clutches are used on the headshaft drive toprevent back-driving at all times during the crane using a Sprag Clutch on the boom raise and lower mechanism, holding the weight of the boom against the diesel engine drive in thelowering motion preventing Sprag Clutch Mounting ArrangementsRENOLD Clutches and Couplings.

9 Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: SeriesSleeve bearing Clutch with gear mounted on outer race hubSO/SX SeriesBall bearing Clutch with gear mounted and bolted to face of SeriesSleeve bearing Clutch with sheave mounted on outer race SeriesSprag Clutch and Pinflex flexible SeriesSprag Clutch and Gearflex coupling SeriesClutch with reservoir, torque arm and auxiliary seal with bolt andretaining Series ClutchesMax torque41Nm - bore16mm - overrunning speed3450 RPMPage No:17SB Series ClutchesMax torque2170Nm - bore50mm - overrunning speed1950 RPMPage No:19SO/SX Series ClutchesMax torque36600Nm - bore180mm - overrunning speed3600 RPMPage No:22 Flanged Stubshaft AdaptorMax torque36600Nm - No:28 SCPF Series CouplingMax torque9660Nm - 7120 bore175mm - overrunning speed3600 RPMPage No:32 SCGF Series CouplingMax torque9660Nm - bore145mm - overrunning speed3600 RPMPage No:33DM Series ClutchesMax torque3417Nm - shaft - overrunning speed1800 RPMPage No:34 Sprag Clutch - Indexing and Over-runningRENOLD Clutches and Couplings.

10 Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: Clutch - BackstopsRENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: Seal BackstopMax torque759300Nm - bore500mm - No:47 Special torque arm BackstopPage No:42 - 43 Tension Release MechanismsPage 48 Torque limiter clutchesMax torque759300Nm - bore500mm - No:49SH & SLH HoldbacksMax torque759300Nm - bore500mm - No:40 Sprag Clutch - Overrunning-Indexing-BackstoppingRENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: are three basic applications for the Sprag Clutch . Overrunning Indexing Backstopping or overrunning and backstopping applications, one race of the Clutch is required to run at a faster speed than the other.