Length inch 1 mm 0. Force pound-force 1N 0. Pressure, pounds per 1 MPa psi 1 psi 6, Pa stress square inch. SKF Group The contents of this publication are the copyright of the publisher and may not be reproduced even extracts unless prior written per- mission is granted.

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Length inch 1 mm 0. Force pound-force 1N 0. Pressure, pounds per 1 MPa psi 1 psi 6, Pa stress square inch. SKF Group The contents of this publication are the copyright of the publisher and may not be reproduced even extracts unless prior written per- mission is granted.

Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or conse- quential arising out of the use of the information contained herein.

The data in this publication may differ from that provided in earlier publications because of redesign, technological developments or revised methods of calculation.

SKF reserves the right to make continuing improvements to SKF products without prior notice with respect to materials, design and manufacturing methods, as well as changes necessitated by technological developments. From one simple but inspired solution to a mis- alignment problem in a textile mill in Sweden, and fifteen employees in , SKF has grown to become a global industrial knowledge leader.

Over the years we have built on our expertise in bearings, extending it to seals, mechatronics, services and lubrication systems. Our know- ledge network includes 46 employees, 15 distributor partners, offices in more than countries, and a growing number of SKF Solution Factory sites around the world. Research and development We have hands-on experience in over forty industries, based on our employees knowledge of real life conditions. In addition our world- leading experts and university partners who pioneer advanced theoretical research and development in areas including tribology, condi- tion monitoring, asset management and bearing life theory.

Our ongoing commitment to research and development helps us keep our customers at the forefront of their industries. SKF Solution Factory makes SKF knowledge and manufacturing expertise available locally, to provide unique solutions and services to our customers.

We work closely with our customers throughout the asset life cycle, helping them to profitably and responsibly grow their businesses. Working for a sustainable future Since , SKF has worked to reduce the negative environmental impact from our own operations and those of our suppliers. Our con- tinuing technology development introduced the SKF BeyondZero portfolio of products and services which improve efficiency and reduce energy losses, as well as enable new technol- ogies harnessing wind, solar and ocean power.

This combined approach helps reduce the environmental impact both in our own oper- ations and in our customers. Working closely with you entire application. This approach doesnt just Our objective is to help our customers improve focus on individual components like bearings or productivity, minimize maintenance, achieve seals. It looks at the whole application to see higher energy and resource efficiency, and opti- how each component interacts with the next.

Design optimization and verification Innovative solutions SKF can work with you to optimize current or Whether the application is linear or rotary or a new designs with proprietary 3-D modeling combination of the two, SKF engineers can work software that can also be used as a virtual test with you at each stage of the asset life cycle to rig to confirm the integrity of the design.

Machinery maintenance Condition monitoring technologies and maintenance services from SKF can help minimize unplanned down- time, improve operational efficiency and reduce main- tenance costs. Sealing solutions SKF offers standard seals and custom engineered seal- ing solutions to increase uptime, improve machine reli- ability, reduce friction and power losses, and extend lubricant life.

Mechatronics SKF fly-by-wire systems for aircraft and drive-by-wire systems for off-road, agricultural and forklift applica- tions replace heavy, grease or oil consuming mechanical and hydraulic systems.

Lubrication solutions From specialized lubricants to state-of-the-art lubrication systems and lubrication management services, lubrication solutions from SKF can help to reduce lubrication related downtime and lubricant consumption. Actuation and motion control With a wide assortment of products from actuators and ball screws to profile rail guides SKF can work with you to solve your most pressing linear system challenges.

SKF the knowledge engineering company. Industrial shaft seals. This edition of the Industrial shaft seals catalogue The SKF Interactive Engineering Catalogue supersedes the one published in publi SKF provides this catalogue in electronic format, cation number For this new edition, the SKF Interactive Engineering Catalogue, numerous revisions, additions and enhancements online at www.

Though the aim of this cata- Units logue is to cover a very wide seal assortment, it The units in this catalogue are in accordance with still only includes a selection of our complete ISO International Organization for Standard assortment of shaft seals and accessories. SKF reserves the right to make continuing improvements to SKF prod- ucts without prior notice with respect to materi- als, design and manufacturing methods, as well as changes necessitated by technological developments.

Catalogue overview In order to emphasize the importance of studying the operating conditions of each application be- fore selecting a sealing solution, this catalogue outlines the most important factors to consider. These are provided in the chapter Product data general, along with basic shaft and housing bore requirements.

SKF industrial shaft seals and accessories are divided into three main groups: radial shaft seals, axial shaft seals and wear sleeves.

Differ- ent seal types within these groups are described with their respective design, materials and applications. Product descriptions are followed by product tables.

It should be noted, however, that these tables only cover a selection of available sizes. Always contact your SKF sales representative for complete and updated availability information. Seals for heavy Metal face seals Wear sleeves for heavy industrial applications industrial applications. Profile overview selection. Selection of seal design and material. Seal materials. Wear resistance. Operating temperatures. Chemical resistance. Storage and handling of seals.

Industrial shaft seals are used to seal the opening Availability between a rotating and a stationary component, The SKF assortment of industrial shaft seals or between two components in relative motion. The products shown in this catalogue and listed in the product tables Retain the lubricant are the more commonly used seal types and Exclude contaminants sizes.

Separate two different media Seal under pressure Guidance values Since several factors simultaneously affect the To be effective, industrial shaft seals should sealing system and seal performance, all stated operate with a minimum of friction and wear, values in graphs and tables in this publication even under unfavourable operating conditions. Each of these designs and material combinations has specific properties, making them suitable for a particular application.

The main groups of shaft seals and accessories are:. Radial shaft seals Seals for general industrial applications Seals for heavy industrial applications Cassette seals. Axial shaft seals Track pin seals Metal face seals V-ring seals Axial clamp seals. Because the influence of one operating con- dition typically dominates the seal selection process, there are no universal rules for deter- mining the appropriate seal type or design for Fig.

This section describes how HMS5 seal operating conditions affect seal performance and service life and provides guidance on selecting the most appropriate seal for a given application. Matrix 1 and 2 on pages 90 to 91 and to list the standard SKF radial shaft seals and their main features and permissible operating conditions. Grease retention Greases have a relatively high viscosity and are relatively easy to retain in a bearing arrange- ment. In many grease lubricated applications, a non-spring-loaded sealing lip design or a V-ring can adequately retain the grease fig.

CRW1 seal When frequent relubrication is required, the lip of at least one of the seals in the sealing arrangement should be directed toward the air side so that excess grease can escape via the sealing lip fig. This avoids grease build-up, which can retain heat and limit heat dissipation. For grease lubricated applications, SKF recom- mends calculating the permissible circumferential speed for oil and halving the result.

Another way of increasing a seals pumping ability is to add a helix pattern, i. The rubber outside diameter, like the one found on HMS5 seals, helps compensate for Fig. For very tough operating conditions, where circumferential speeds are relatively low, metal face seals, like the HDDF seal fig. V-rings fig. For tough operating conditions, SKF Wave seals fig.

To further enhance sealing ef- ficiency, two single-lip seals can be arranged in tandem fig. These seals, which act as flingers, rotate with the shaft and seal against a surface that is perpendicular to the shaft.

V-rings and axial clamp seals are often used Fig. None of these seal arrangements are intended for oil retention. Seals with an auxiliary lip, like the HMSA10 seals fig. Another option is to use two seals installed in opposite directions figs. These solutions, which depend on the availability of space and required efficiency, include:. In both alternatives, the sealing lips must be spring-loaded.

When using an HDSD seal, it is very important to provide a means to lubricate the sealing lips, i. HMS5 seals. Circumferential and rotational speed The permissible speed of a seal is determined by its design and sealing lip material as well as the material and condition of the shaft. All of these factors influence the heat generation at the seal counterface. Lubrication of the sealing lip and the characteristics of the lubricant also have a direct influence on heat generation because they have a direct impact on heat dissipation.

Diagram 1 compares the permissible circum- ferential speeds for various seal designs assum- ing normal seal operation, grease or oil retention and no pressure differential across the seal. Diagram 1. If the seal is not designed to resist the pressure, it will be forced against the shaft, increasing the radial load, underlip temperature, friction and wear of the seal and the counterface, resulting in shortened service life.

In applications with pressure differentials, shaft seals should be secured axially from the low-pressure side to prevent them from moving axially.

This can be accomplished by installing the seal into a counterbore fig. In these situations, special radial shaft seal designs must be used fig. V-rings seal axially by exerting light pres- sure against the counterface that can be a stationary or rotating machine component. In applications with large shaft diameters, HS8 seals are an appropriate choice when space is limited fig.

After being positioned on the shaft, HS and HSF seals are held together by a spring and spring connector. These seals should be retained axially in the housing bore by a one-piece or split cover plate. Since V-rings are elastic, they can be stretched and are therefore easy to install, even in applications where they have to be passed Fig. However, V-ring seals in the event that replacing a V-ring would require the time consuming removal of several compo- nents, it is advantageous to install one or two replacement V-rings on the shaft from the outset fig.

When the time comes to replace a worn V-ring, it can be cut and removed and the replacement V-ring can be pushed into position. Oil retention is also more challenging for seals installed on ver- tical shafts. In general, however, all seals listed in the product tables are suitable for use on both horizontal and vertical shafts.

V-rings figs. They act as flingers and are therefore particularly suit- able as both primary and secondary seals on vertical shafts. Highly efficient sealing arrange- ments, like those found in submersible pumps, can be achieved using radial shaft seals in tan- dem with a V-ring for additional protection against contaminants fig.


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Los sellos afectan de manera decisiva el rendimiento de los sistemas. Con SKF, se obtiene apoyo para todos los aspectos clave de su sistema de sellado. Regresar arriba. Soluciones de sellado para un mejor rendimiento de los sistemas.


Catalogo retenes skf.pdf


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