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 [email protected] www.laleonessa.it

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 LEOflE^A brewini

Company profile Leonessa Brevini As worldwide leading manufacturer, Leonessa Brevini offers its experience in the design and manufacture of slewing rings.

Quality 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. Advanced technology and continuous improvement are the keys of the Company's constant evolution. 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...

Range of products 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. • Automation: Robots, Transportation lines, Automation systems. • Ecology: Water treatment plants. • Forestry machinery: Boogie axles, Forestry cranes, Forest havesters. • Rotative machinery: Bottling, Packaging equipments, Palletizers. • Earth moving equipments...

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 verify the suitability.

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 examination....

Coefficient of application The coefficient of application is defined according to the particular performance of the slewing ring in compliance with a specific application. These parameters have statistically been set on the basis of oiii long term experiences. 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...

The Ap value is determined using the following formula: AP= -^—x(dw-dr)K 4 with dW = diameter of the contact surface under the screw or nut dr = hole diameter 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. To calculate...

Dynamic load Load case study 1: maximum operating load, including wind FA = P + H +B + G + T = 250 + 100 + 650 + 1800 + 750 = 3550 daN = 35.5 kN FR = Fp - W = 400 - 150 = 250 daN = 2.5 kN MR = (P + H) . a + B . b + W .d - T . c - G . g = (250 + 100) . 10 + 650 . 4.75 + 150.4 - 750 . 0.4 -1800.0.7 = 5627.5 daNm = 56.275 kNm Load case study 2: operating load, including 25% overload, without wind FA = 1.25 . P + H +B + G + T = 1.25 . 250 + 100 + 650 + 1800 + 750 = 3612.5 daN = 36.125 kN FR = Fp = 400 daN = 4 kN MR = (1.25 . P + H) . a + B . b - T . c - G . g = (1.25 . 250 + 100) . 10 + 650 . 4.75...

Notes LEOflFWA brewini DATA REQUEST FORM LEOIIE^A brewini LEOTIE^A brewini

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

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, can...

Construction tolerances The steels used in the construction of Leonessa Brevini slewing 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: • normalized • quenched and tempered The below chart shows the average hardness: Leonessa Brevini slewing rings are manufactured with tolerances and backlashes whose values depend on the slewing ring dimensions and its application. The tolerance values are indicated in the drawings, with an example here below. As regards dimensions...