general static load capacity in four contact point slewing

Discover the most versatile articulating cranes in the world With a lifting capacity ranging from 2 ton meters to 300 ton meters Effer Knuckle Boom Cranes are a popular choice for utility construction mining and marine industries and boast a power to weight ratio that is the best on the world market Slewing bearing can simultaneously support larger combined load including axial load radial load and tilting moment etc General slewing bearing all has mounting holes oil holes and sealing apparatus can meet categories of main machine operating under various different conditions

a new model for the static load rating

point contact were introduced in the Iso 76 standard [2] for the calculation of the static load rating of rolling bearings Compared with through- hardened bearings the calculation method for the load-carrying capacity of surface-hardened bearings especially induction-hardened bearings is still not well established despite efforts made so

Determining the equivalent static bearing load without radial load (static limiting load diagram) F0q is the axial force in kgf 141 M0q is the tilting moment (max) in kNm 160 7 Load Point must be below static limit curve of the selected slew ring bearing Dynamic Load Carrying Capacity and Life for Slewing Ring Bearing

A New Class of Ball Bearings Ball Bearings with 4 5 or 6 Contact Points International Multidisciplinary Conference 8th Edition Nyiregyhaza Hungary 2009 18 - Web page of Sirca S A - Romania – general catalogue 19 – Web page of Rima spa – Italy – general catalogue

Equivalent static load The equivalent static load P 0 is a calculated value It corresponds to a concentric axial load in axial bearings P0 induces the same load at the centre point of the most heavily loaded contact point between the rolling element and raceway as the combined load occurring in practice P0 N Equivalent static bearing load

Load Capability Silverthin™ Slewing Ring Bearings are designed to accommodate significant radial thrust and moment loads as shown below: This is accomplished in most cases by the unique four point contact raceway geometry which is similar in concept to Silverthin™ X-Type Thin Section bearings

Slewing Bearings Type Overview

Wind turbines handling technology general engineering Crossed-roller Slewing Bearing High precision High rigidity Uniform rotational resistance with changing load Applications: Machine tools tunnel boring machines positioning devices Roll Slewing Bearing High accuracy and rigidity Very high static and dynamic load capacity Suitable

Abstract: A calculation method of static load capacity for three-row roller slewing bearing considering clearances was proposed The statics models of the slewing bearing in the radial direction and the axial direction were established respectively By solving the equilibrium equations of the models the rolling element loads were calculated

General static load capacity in four contact point slewing bearings J Aguirrebeitia R Avils I F de Bustos M Abasolo Department of Mechanical Engineering University of the Basque Country Spain Abstract This work tries to represent the general static load-carrying capacity of four-contact-point slewing bearings under general loading

Keywords: four contact point slewing bearing acceptance surface bearing selection static load capacity 1 Introduction Slewing bearings are large-sized bearings with many applications such as in wind turbine generators tower cranes vertical lathe tables

In terms of operating specifications the most important measurements to consider are static axial or thrust load static radial load and moment load Typically these specifications are measured in pounds (lbs) or feet-pounds (ft-lbs) Standards SAE PAPER 831371-- Case depth for induction hardened slewing bearing rings References Image Credits:

a high static load capacity Applications: cranes building machinery plant and K1 Single-row ball slewing bearings four point contact bearings Kreuzrollendrehverbindungen X1 Crossed-roller slewing bearings 1 2 for U* min 4 4 mm Tragzahlen / Load ratings axial radial axial radial C 0a [kN] C 0r [kN] C a [kN] C r [kN] 1 295110 169111

The design of the support subassembly (a) single row ball slewing bearing with four-point contact (b) For the calculations catalog single row ball slewing bearing with four-point contact was assumed (Fig 1b) [9] In this bearing there is one row of balls and each ball cooperates with two pairs of track

WCB slewing rings are designed as: four point contact Technical principles 12 Load carrying capacity and life 12 Static load carrying capacity 12 Definition of static 2 000 ⋅ M 0k Figure 1 Static radial load factor f0r for four point contact = -----

Rothe Erde Slewing Bearings

Slewing Bearings Static load capacity The determined loads must be multiplied with a factor fstat allocated to the application The product F a' or M k' must be below the static critical load curve of the selected bearing With regard to radial loads in load combinations F a = axial load F r = radial load

The calculation procedure was implemented in a computer programme which can be used to analyze two- and four-contact point single- and double-row large slewing ball bearings The calculations have shown that the finite element method when considering the criteria of the allowed permanent raceway deformation may define the static capacity of

Jul 01 2013In the blade bearing the axial force is caused by the weight of the blade and its centrifugal force whereas the wind load is responsible for the radial load and the tilting moment In a previous work the authors derived a theoretical method to arrange the general static load capacity of four‐contact‐point slewing bearings

According to different structural feature slewing bearing can respectively meet main machine requirements under various load conditions Among them four point contact ball slewing bearing has higher dynamic load capacity cross cylindrical roller slewing bearing has higher static load capacity

The main distinguishing features are the raceway system and the teeth But also the size of the rolling elements and the running circle diameter are defined in the designation In addition to ball and roller slewing bearings we also supply sprocket rings and sprocket segments

a high static load capacity Applications: cranes building machinery plant and mechanical engineering wind turbines Kugeldrehverbindungen 1-reihig Vierpunktlager K1 Single-row ball slewing bearings four point contact bearings Fr Anwendungen mit gleichmigem Drehwiderstand bei wechselnden Belastungen hoher Genauigkeit und 6WHLJNHLW

Wind turbines handling technology general engineering Crossed-roller Slewing Bearing High precision High rigidity Uniform rotational resistance with changing load Applications: Machine tools tunnel boring machines positioning devices Roll Slewing Bearing High accuracy and rigidity Very high static and dynamic load capacity Suitable

Effect of the preload in the general static load-carrying capacity of four-contact-point slewing bearings for wind turbine generators: theoretical model and finite element calculations Josu Aguirrebeitia Jon Plaza Mikel Abasolo Javier Francisco Vallejo

Single-row ball bearing slewing rings Four-point contact bearings Pages 85 – 121 Standard series RD 700 4 Rothe Erde Slewing Bearings Load transmission 8 Bearing selection 9 –10 Load factors for bearing selection 11 Example of a bearing selection 12 – 14 Service life 15 Example of a service life calculation 16 – 17

Load Capability Silverthin™ Slewing Ring Bearings are designed to accommodate significant radial thrust and moment loads as shown below: This is accomplished in most cases by the unique four point contact raceway geometry which is similar in concept to Silverthin™ X-Type Thin Section bearings

Curve of Double-row Four-point Contact Ball Bearing Shaochuan Li on the static load bearing curve[1-9] In 2012 Wang Hong and the bearing capacity of cross roller slewing bearings and gave the bearing curves of bearings under different cross angles [14 15]

Sep 13 2015010——Single-row four-point contact slewing bearing without teeth Design standard JB/T10839 4 4 Product catalogue-Structural parameters Load curve page Model DL mm Overall dimension Installation dimension Structure size Gear parameter Gear force of periphery Ref weight Kg De mm D mm d mm H mm D1 mm D2 mm n Φ mm M mm n1 D3 mm d1 mm H1 mm h

Equivalent static load The equivalent static load P 0 is a calculated value It corresponds to a concentric axial load in axial bearings P0 induces the same load at the centre point of the most heavily loaded contact point between the rolling element and raceway as the combined load occurring in practice P0 N Equivalent static bearing load