Slewing gearbox
20Pages

ZOLLERN Solid metals. Fine solutions. Drive Technology Slewing gears

The ZOLLERN Group ZOLLERN is one of the pioneers in the metal industry. At several locations in Europe, North America and Asia, 2,400 employees develop, produce and service a wide range of high-quality metal products. ZOLLERN supplies sophisticated solutions for a wide range of applications with its business areas of drive technology, investment casting, sand casting and forging, mechanical engineering elements and steel profiles. Slewing Units 3 Features and design 4 Gear unit selection Application Factor k 10 Classification guidance 10 Technical Data 11 Installation instructions 14 Gear...

Slewing Units Slewing Units ZOLLERN Slewing Units have proved highly successful under extreme operating conditions. Their principal features and most significant advantages are • compact dimensions • long operation life • modular design of gear unit • ease of maintenance • high performance • functional design With these characteristics the machine designer will get a ready to install unit and will achieve economic solutions even in confined space conditions. Potential applications • mobile cranes • material and working elevators • shipboard and deck cranes • dockyard and harbour cranes •...

Coaxial design Three planetary stages Ratios i = 46 to 177 Drive by electric motor Short output shaft Input shaft and output shaft have the same direction of rotation. Coaxial design Three planetary stages Ratios i = 46 to 177 Drive by electric motor Long output shaft Fastening by reaction torque arm Input shaft and output shaft have the same direction of rotation Slewing Unit Output torques from 1.400 to 1.550.000 Nm Ratios i = 17 to 1.209 (other ratios available on request). When determining the torque, the acceleration and the deceleration as well as wind effect and other induced loads...

Coaxial design Three planetary stages Ratios i = 46 to 177 Drive by hydraulic motor Long output shaft Input shaft and output shaft have the same direction of rotation. Coaxial design Two planetary stages Ratios i = 17 to 35 Drive by hydraulic motor Short output shaft Input shaft and output shaft have the same direction of rotation. Lubrication All gears and anti-friction bearings are splash lubricated. Output bearings are grease packed for lifetime operation -requiring no further service attention. Service intervals and recommended lubricants are given in the table on page 15. Oil level is...

Seals The input is sealed by a radial shaft sealing ring with a dust lip a) by two radial shaft sealing rings b) by the grease packing in the output shaft housing c) by another radial shaft sealing ring so that safe protection against oil loss and against penetration of dirt and water is assured. Eccentric adjustment For accurate adjustment of backlash between the output pinion and the driven ring gear, the output shaft assembly can be provided with eccentric adjustment in relation to the flange and output pinion. Eccentricity Flange I x = 2,5 Flange II x = 1,5 Flange III x = 1,5 Painting...

Output Pinion Options Output Pinion Specification Tough 42CrMo4V hardened gear steel tempered to 700– 900 N/mm2 Teeth surface hardened HRC 57+7 (Case hardened Pinions with ground gearing available on request) Selection of gear unit size In order to determine the correct gear unit for a given application, the output torque Tdyn has to be multiplied with the factor k, page 10. Tnom = Tdyn x k ≤ Tdynmax Working conditions The slewing gears are designed for operation in European conditions or similar. Permissible oil temperatures -20°C to +70°C. Forged one piece pinion shaft – standard Working...

Gear unit selection Determination of the imposed maximum torques on the output pinion of the slewing gear unit can only be undertaken with the exact knowledge of the general view. The following has to be considered acc. to section I, 3rd edition 1998 Smf = maximum torque due to frictional forces Smw8 = maximum torque due to wind effect 80 N/m2 Sms = maximum torque due to inclined position Sma = maximum torque due to acceleration SMW25 = maximum torque due to wind effect 250 N/m2 Ym = amplifying coefficient of loading depending on mechanism group factor Regular service without wind effect SM...

Running time classification Mean running time per day in hours, related to one year over 0,25 over 0,5 over 1 Life in hours 8 years, 200 days/year Drive unit class Application Factor k

Application Factor K for slewing gears / Classification guidance / Technical Data flange I flange IIstandard Nominal Output torque1' size ZHP 11 According to FEM section I Drive unit class M5 2) Changes possible depending on motor size ZOLLERN have a policy of continuous Load conditions L2 (P = const. / nab = 15 rpm) product improvement, and details may Running time classification T5 be changed without notice.

Nominal Output drive Hydraulic motor input size ZHP Changes possible depending on motor size

Electric motor Keyed shaft with keyway to DIN 6885 Nominal Electric motor input size ZHP

The slewing gear needs to be correctly fitted in the The structure must be rigid and sufficiently stiff to machinery bed frame. Locations need to be concentric resist bending during operation. The table below gives and square to the ring gear fitting. recommended tolerances. The pinion shaft of the slewing gear Nominal must not be deformed inadmissibly size by external forces and manufacturing tolerances. Max. admissible tolerances from the centre axis Nominal Max. admissible deformations due to external forces Concentric bores in the assembly, size admissible manufacturing Length of output...

Installation instructions / Gear reduction ratios

Recommended lubricants for ZOLLERN Slewing gear units Attention: Mineral and PAO-based gearbox oils are not to be mixed with PG (polyglycol)-based synthetic oil. Greases with different soap bases are not to be mixed. Type/ Specification