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Shaft-Hub-Connections

Shaft-Hub-Connections

Product catalog summary

Introduction
This document provides an in-depth overview of RINGSPANN's shaft-hub connections, including shrink discs, cone clamping elements, star discs, and clamping systems for torque motors. It highlights their specifications, design, and functionality, focusing on their ability to transmit torque, axial forces, radial forces, and bending moments.

Frictional Shaft-Hub Connections
These connections are crucial for linking shafts and hubs, offering advantages such as higher torque transmission compared to traditional keyways. Shrink discs and cone clamping elements are noted for their compact and cost-effective design.

Shrink Discs
Shrink discs are external clamping connections used for backlash-free fastening of hollow shafts or hubs to shafts. They generate radial forces through conical surfaces, ensuring optimal centering and torque transmission.

Cone Clamping Elements
These internal clamping connections provide backlash-free fastening of hubs on shafts, creating a frictional connection suitable for components like sprockets and pulleys.

Star Discs
Star discs are ideal for applications requiring frequent clamping and release, providing backlash-free connections suitable for reversing operations and simultaneous transmission of torque and axial force.

Clamping Systems for Torque Motors
These systems ensure secure, backlash-free torque transmission and precise centering of torque motors on machine shafts.

Star Spring Washers
These washers serve as light spring elements for precision machines, reducing noise in ball bearings and compensating for free movement.

RINGSPANN Calculation Method
The document details a calculation method for ensuring accurate preload forces in shaft-hub connections, accounting for friction-coefficient fluctuations to avoid dimensioning errors.

Online Calculation Tool
An online tool is available for calculating optimal shaft-hub connections, providing reliable results for hub dimensions, bearing pressures, and transmissible torques and axial forces.

Design and Function of Shrink Discs
Shrink discs consist of an outer stepped conical ring and an inner stepped conical bush, generating radial clamping forces independent of friction coefficients, allowing for effective torque and axial force transmission.

Shrink Discs Overview
Shrink Discs are mechanical components used for connecting hollow shafts or hubs to solid shafts, designed to provide a backlash-free connection, reducing fretting corrosion and allowing easy disassembly.

Types and Features

RLK 606: Two-part design with high torque capacity, suitable for various shaft diameters.
RLK 603: Three-part design offering high torque capacity, capable of transmitting torque and axial force simultaneously.
RLK 603 S: Similar to RLK 603 but with the highest torque capacity, designed for hollow shafts or hubs with outer diameters ranging from 14 mm to 190 mm.

Technical Specifications
Detailed tables list dimensions, transmissible torque or axial force, clamping screws, and weights for various sizes of Shrink Discs, including article numbers for ordering.

Materials and Installation
Shafts and hollow shafts should have a yield strength of at least 340 N/mm² and an E-module of approximately 206 kN/mm². Installation and operating instructions are available upon request.

Ordering Examples
Examples are provided for ordering specific Shrink Discs, including necessary article numbers and size specifications.

Additional Information
For other shaft diameters and technical details, refer to the technical specifications on page 31. The document also includes information on joint clearance tolerances and surface characteristics.

Overview of Cone Clamping Elements
This section provides technical specifications and installation guidelines for Cone Clamping Elements, specifically models RLK 110, RLK 110 K, RLK 130, and RLK 131, designed for high transmissible torques and axial forces.

Specifications

Surface Roughness: Average surface roughness at contact surfaces between the shaft and hub bore is Rz = 10…25 µm.
Materials: The shaft and hub require an E-module ≥ 170 kN/mm².
Tolerances: h8 for shaft diameter (d) and H8 for hub bore (D).

Installation
Users are advised to request specific installation and operating instructions for each model. The transmissible torques or axial forces are subject to tolerances, surface characteristics, and material requirements.

Transmissible Torques and Axial Forces
Detailed tables list transmissible torques and axial forces for various shaft diameters and hub bores, noting that simultaneous transmission reduces the transmissible values.

Features

RLK 110: High transmissible torques, suitable for small hub outer diameters, no axial displacement during clamping.
RLK 110 K: Corrosion protected with nickel coating, high transmissible torques, suitable for shaft diameters between 19 mm and 60 mm.
RLK 130: Very high transmissible torques, suitable for shaft diameters between 20 mm and 180 mm.
RLK 131: No axial displacement during clamping, suitable for shaft diameters between 20 mm and 180 mm.

Application Examples
Examples include backlash-free connection of an eccentric wheel to a drive shaft in packaging machines and connection of a cam disc to a drive shaft in paper processing machines.

Ordering Information
Examples for ordering specific models are provided, including article numbers and size specifications.

Overview of Additional Cone Clamping Elements
This section covers RLK 200, RLK 250, RLK 250 L, and RLK 300, used for clamping connections in mechanical assemblies, offering features like easy release, compact design, and the ability to transmit torque and axial force.

Specifications

RLK 200: Known for its easy release and compact design.
RLK 250: Centers the hub to the shaft, suitable for small hub outer diameters, and allows quick assembly.
RLK 250 L: Similar to RLK 250 but designed for hollow shafts.
RLK 300: Designed for individual clamping connections.

Procedures

Installation instructions are available upon request for each type of clamping element.
Transmissible torques and axial forces are subject to specific tolerances, surface characteristics, and material requirements.

Standards and Tolerances

Surface roughness for contact surfaces should be Rz = 10…25 µm for RLK 250 and RLK 250 L, and Rz = 4…10 µm for RLK 300.
Tolerances for shaft diameter and hub bore are specified as h8 and H8 respectively.

Recommendations

For simultaneous transmission of torque and axial force, the transmissible values are reduced.
In cases where the hub cannot be freely moved, values for torque and axial force are reduced by 37%.

Key Data from Tables

Tables provide detailed dimensions, technical data, and article numbers for each clamping element type.
Data includes yield strength, transmissible torque or axial force, contact pressure, and weight for various sizes.

Axial Preloading of Bearings
Axial preloading of ball bearings using RINGSPANN Star Spring Washers eliminates radial play, leading to better load distribution and increased service life. This technique is particularly beneficial for high-speed machines like small electric motors, where it reduces noise by applying the exact amount of axial pressure needed.

Conditions for Effective Axial Preloading

Axial pressure must be applied to the entire outer race.
Machine component variations should minimally affect the spring force.
The load must be adapted to the bearing size.

Protection Against Vibration
Star Spring Washers prevent damage from vibration in non-rotating bearings, common in electric motors for auxiliary drives in ships and vehicles. By removing radial play, they prevent rotor vibration and subsequent wear.

Applications and Specifications

Star Spring Washers are used in spindle ball bearings for grinding spindles, ensuring maximum tracking accuracy at high speeds.
They accommodate wide axial tolerances, as demonstrated in applications with NILOS sealing rings.

Technical Specifications
The document includes detailed tables listing dimensions, spring travel, pressure, and spring constants for various Star Spring Washer models.

Installation Guidelines
Star Spring Washers should generally work on the outer ring of the ball bearing. The design ensures even axial pressure. For varying axial pressures, washers should be mounted on both sides of the bearings.

Global Presence
The document lists contact information for RINGSPANN offices worldwide, indicating their global reach and support network.

Catalog excerpts

Shaft-Hub-Connections Shrink Discs • Cone Clamping Elements • Star Discs Clamping Systems for torque motors • Star Spring Washers Edition 2022/2023 RINGSPANN® Registered Trademark of RINGSPANN GmbH, Bad Hom

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Frictional shaft-hub-connections Categories of RINGSPANN shaft-hub-connections Ensured Torques with the RINGSPANN Calculation Method Online Calculation Tool shaft-hub-connections Max. transmissible torque upto Shaft diameter Shrink Discs standard short Clamping Noaxial Actuating element displacement device centres ofthehub integrated thehubto totheshaft (screws) theshaft during clamping Design and Function of Shrink Discs RLK 608 Covers for Shrink Discs RLK 608 and RLK 606 RLK 603 Technical Points for Shrink Discs Shaft diameter Cone Clamping Elements Max. transmissible torque upto standard short...

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Max. transmissible torque upto Shaft diameter Star Discs standard short Clamping Noaxial element displacement centres ofthehub thehubto totheshaft theshaft during clamping Actuating device integrated (screws) Design and Function of Star Discs Clamping Connections with Star Discs Star Discs Technical Points for Star Discs Max. transmissible torque upto Shaft diameter Clamping Systems for torque motors standard short Clamping Noaxial element displacement centres ofthehub thehubto totheshaft theshaft during clamping Actuating device integrated (screws) Clamping Systems for torque motors RTM 601...

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Trantorque Mini Star Discs Star Spring Washers

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Frictional shaft-hub-connections Why frictional shaft-hub-connections? Frictionalshaft-hub-connectionsarestandard machine elements used to connect shafts and hubs. They are capable of transmitting torque,axialforces,radialforcesandbending moments. ShrinkDiscsandConeClampingElements Among the frictional shaft-hub-connections ShrinkDiscsandConeClampingElementstake animportantposition.Bytighteningclamping screws conical surfaces are pulled together generatingradialforces;theseforcesprovide therequiredfrictionalconnectionbetweenthe partsinvolvedinthetransmissionoftorquesor forces. ShrinkDiscsandConeClampingElementsare...

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Categories of RINGSPANN shaft-hub-connections Shrink Discs ShrinkDiscsareexternalclampingconnections forthebacklashfreefasteningofhollowshafts orhubstoshafts.Bytighteningclampingscrews conicalsurfacesarepulledtogethergenerating radialforces;theseforcespressthehollowshaft ontotheshaft.Torquesoraxialforcescanbe transmittedfrictionallyfromthehollowshaftto theshaft.TheShrinkDiscitselfisnotinvolvedin thetransmissionoftorquesoraxialforces.The radialclampingforceswhichactthroughthe circumferenceofthehollowshaftalsoensure anoptimumcentringtotheshaft. Shrink Discs are used, for example, to fasten machineshaftstogearboxeswithhollow-shafts....

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Ensured Torques with the RINGSPANN Calculation Method The RINGSPANN calculation method ensures thatsucherrorsinthedimensioningofshafthub-connectionsareavoided.Thisisachieved byusingamethodthathasbeentestedand provenovermanyyears,accordingtowhichthe realfrictioncoefficientμK inthecontactarea Simplified calculation method without accounting for friction-coefficient fluctuations Standard Berechnungsmethode RINGSPANN Berechnungsmethode RINGSPANN calculation method accounting for friction-coefficient fluctuations undertheheadofthescrewandμG inthescrew threading lie between 0,12 and 0,14. This conformstocurrentengineeringstandardsas...

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Online Calculation Tool shaft-hub-connections ThenewRINGSPANNCalculationToolhasbeen developedtoworkouttherightandtime-efficient dimensioning of an optimal shaft-hubconnection. WhetheraConeClampingElementoraShrink Disc,reliableresultsconcerningthenecessary hubdimensionsandbearingpressurescanbe determinedwithinafewminutes,aswellasthe transmissibletorquesandaxialforcesfordifferentstrengths,torquesandnumbersofscrews. Thismeansthatanyoversizingorundersizing of the elements can be avoided and a costoptimisedsolutionfoundfortheapplicationin question. Theuseofthetoolsisintuitivelydesignedand thecalculationresultsareavailableafterjusta...

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Design and Function of Shrink Discs Two-part Shrink Discs Design and Function Two-part shrink discs consist of an outer stepped conical ring, and an inner stepped conicalbush,aswellasanumberofclamping screws(seeFigure10-1). The stepped conical ring is pulled onto the steppedconicalbushbytighteningtheclamping screws. A radial clamping force is generatedbytheconicalsurfaces,whichisindependentofthefrictioncoefficientsatthescrews andconicalsurfaces.Theradialclampingforce presses the hollow shaft onto the shaft and createsafrictionalconnectionatthecontact surfaces between the shaft and the hollow...

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Design and Function of Shrink Discs Three-part Shrink Discs Pressureﬂange Innerring Three-part shrink discs consist of a threaded flange,apressureflange,aslottedinnerringand anumberofclampingscrews(seefigure11-1). Hollowshaft Clampingscrews Thethreadedflangeandthepressureflange are pulled together over the inner ring by tightening the clamping screws. A radial clamping force is generated by the conical surfaces which is dependent on the friction coefficientsatthescrewsandconicalsurfaces. Theradialclampingforcepressesthehollow shaftontotheshaftandcreatesafrictionalconnection at the contact surfaces...

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Shrink Discs RLK 608 two-part design highest torque capacity Features • Highesttorquecapacity • Transmissibletorqueof330Nmupto 4225000Nm • Easy,quickassemblybytightening clampingscrewswithoutatorquewrench • Distance-controlledassemblyensures guaranteedtransmissibletorques • Encloseddesign,thereforeimpervious todirt • Truerunningevenathighspeeds • Centresthehollowshaftorhubtotheshaft • Forhollowshaftsorhubswithouter diametersof30mmupto620mm 12-1 Application example Backlash free connection of a hollow-shaft gearboxtoamachineshaftwithaShrinkDisc RLK608.Thebacklashfreeconnectionreduces the risk...

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