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Leonessa Brevini

Leonessa Brevini
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IT’S_COMMUNICATION - www.itsol.it Slewing rings GENERAL SLEWING RINGS CATALOGUE General catalogue LEONESSA BREVINI (YANCHENG) SLEWING BEARINGS CO.,LTD No. 65 East Yandu Road, Economic Development Zone, Yancheng, Jiangsu, P.R.C., 224007 Office +86 515 89026300 Fax +86 515 89026366 www.leonessabrevini.com LA LEONESSA S.P .A. Viale Santa Maria, 90 25013 CARPENEDOLO (Brescia) Italy Tel. +39 030 9965435 Fax. +39 030 9965629 sales@laleonessa.it www.laleonessa.it

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Index Introduction Company profile Quality Main applications Range of products General concepts Load trasmission Connection structure Load factors choice Bolts Calculation example Dynamic loads Data request form Slewing ring features Gears Heat treatments Materials Dimensional tolerances Rotation torques Assembly and maintenance Assembly Maintenance Product range Slewing ring - 1 row of balls Slewing ring - 2 rows of balls Slewing ring - 1 row of rollers

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Company profile Leonessa Brevini As worldwide leading manufacturer, Leonessa Brevini offers its experience wing rings.

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Company profile Leonessa Brevini general slewing rings catalogue shows the entire production range and aims to be a valuable aid in choosing the most suitable slewing ring. The range includes rings with diameters up to 2500 mm with the following features: one row of balls or rollers, two rows of balls. All products are available with internal or external gear, or without gear. The slewing rings are manufactured exclusively through numerical control machinery. Induction hardening of the bearing raceways and gear is carried out by means of equipments which have the most sophisticated control...

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Main applications Leonessa Brevini slewing rings are used in several fields of application, amongst which: • Lifting equipment: Mobile cranes, Gantry cranes, truck cranes, Aerial platforms, Stackers. • Building equipment: Concrete pumps, Demolition equipments, Dumpers, Multi purpose lifting machines, Construction cranes, Concrete mixers. Robots, Transportation lines, Automation systems. Water treatment plants. • Forestry machinery: Boogie axles, Forestry cranes, Forest havesters. • Rotative machinery: Bottling, Packaging equipments, Palletizers. • Earth moving equipments and foundation...

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Slewing ring choice General concepts The following information helps in choosing the best slewing ring. General indications and formulas, combined with drawings and load charts, offer the best working tool. Leonessa Brevini Technical Department is available to

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Load transmission Connecting structure Slewing rings are designed and produced to connect two parts of a machine, enable a reciprocal rotation and the transmission of axial loads, radial loads and tilting moment in various combinations. For this purpose, it is defined: Axial load FA: sum of all forces acting parallel to the rotation axis of the slewing ring. The slewing rings are normally mounted against the connecting structure, with forces acting in compression; in the case of axial load in traction it is necessary to contact the Technical Department of Leonessa Brevini for further...

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Load factors choice Slewing ring choice To choose a slewing ring the following specifications are required: Application’s description Working loads on the Slewing ring Operating cycle Slewing torque Maximum dimensions At first the design of a slewing ring can be made by comparing the applied loads with the load capacity of the bearing raceway. The load capacity of a slewing ring is detailed in a load chart and is calculated by taking into consideration: Slewing ring geometry The ring's material The heat treatment parameters of the bearing raceways Dimensions, material, heat treatment and...

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Bolts To calculate the length of the bolt, the following indications must be noted: The correct performance of slewing rings depends on a well-designed and well-assembled bolting to the connecting structure. The appropriate fastening method expects screws and bolts; any other fastening method (welding) is forbidden. Bolts in the quality classes 10.9 or 8.8, in compliance with regulation ISO 898-1, is recommended, while nuts have to be of an equal or greater quality class with respect to the corresponding screws. A preliminary test of the connection can be performed using the limit curves of...

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Calculation example Choice example The maximum load has to be calculated according to the following case study. Aerial platform Design data: Loads Distances For testing the worst possible load condition is taken into The worst load condition is case study 2 with: Load case study 1: maximum operating load, including wind Load case study 2: operating load, including 25% overload, without wind We chose to verify a slewing ring with one row of balls. Point A of coordinate (FA;MR) has to be under the bolt limit curve of the 8.8 or 10.9 quality class, while point B of coordinate (FAeq1; MR1) has...

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Data request form DATA REQUEST FORM Data 5/12 | Rev 0 | Scheda n° Slli LcOnE^A brevini

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Slewing rings Leonessa Brevini slewing rings are designed to reach the most demanding

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Gears Leonessa Brevini slewing rings can be manufactured with internal or external gear. Our standard gears are with straight teeth, with pressure angle at 20° and with module from 2.5 to 16 mm, in quality class from IT8 to IT 12, according to ISO standards. Heat treatments All Leonessa Brevini slewing rings have heat-treated bearing raceways with an induction hardening treatment. The surface hardness grade is HRC 55-60, with an appropriate treatment depth suitable to the size of the rolling elements. Other types of gears with pressure angles of 25°, 27° or more, helicoidally, chain-shaped,...

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The steels used in the construction of Leonessa Brevini sle- wing rings are in accordance with international standards. The most widely used steels are: These types of steel are chosen according to the slewing ring design and its application: The below chart shows the average hardness: Rolling elements (balls and rollers) are made of tempered steel 100Cr6, with a surface hardness of HRC 63 ±3 and a precision grade 200 according to ISO 3290. Construction tolerances Leonessa Brevini slewing rings are manufactured with tole- rances and backlashes whose values depend on the sle- wing ring...

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