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RTB-Bearings/Unitec Bearings
1 /76Pages

RTB-Bearings/Unitec Bearings

RTB-Bearings/Unitec Bearings
1 /76Pages

Catalog excerpts

RTB-Bearings/Unitec Bearings-1

ENGINEERED BEARINGS PRECISION BEARINGS FOR MACHINE TOOLS CUSCINETTI Dl PRECISIONE PER MACCHINE UTENSILI

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RTB-Bearings/Unitec Bearings-2

MONDIAL UNITEC Mondial is a leading company in the import and distribution of power transmission components. Mondial always provides its customers with highly qualied products matched with an excellent logistic and technical support. Mondial is an ISO 9001 certied Company. Mondial, Azienda leader nell’importazione e commercializzazione di componenti meccanici innovativi e di elevata qualità, offre un servizio costantemente adeguato alle esigenze del mercato. Un servizio che integra dinamicamente l’organizzazione commerciale con quella tecnica e logistica, proponendo una completa gamma di organi...

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RTB-Bearings/Unitec Bearings-3

UNITEC, leading company in the design and manufacturing of special precision cylindrical roller bearings for machine tools and general industry, delivers high quality service and support to customers worldwide. Engineering partnership, technical and logistic services and our commercial network, supplied by different distribution channels, allows us to full unique application requirements on the marketplace. UNITEC is a certied ISO 9001 and ISO 14001 company, belonging to Mondial S.p.A. Group. Advanced technology to meet your customers requirements. Our engineers will assist you in selecting the...

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RTB-Bearings/Unitec Bearings-5

MONDIAL ■ PRECISION LOCKNUTS GHIERE DI PRECISIONE ■ TOLERANCES TABLES TABELLE TOLLERANZE SRB-F Radial needle roller combined bearings with axial cylindrical roller Cuscinetti radiali a rullini combinati con assiali a rulli cilindrici

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RTB-Bearings/Unitec Bearings-6

RTB Combined axial-radial roller bearings for indexing tables Cuscinetti assiali-radiali a rulli, per tavole di indexaggio TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE 2. STIFFNESS High stiffness, considerable load rating, high rotational accuracy are the essential features of the combined UNITEC RTB bearings. The axial cages with a high number of rolling elements with linear contact as well as a very high precision of the machining permit a precise and rigid movement. The size of the axial and radial rollers as well as of the inner and outer rings are carefully measured in order to obtain. The...

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RTB-Bearings/Unitec Bearings-7

Elevata rigidezza, grande capacità di carico, elevata precisione di rotazione, sono i requisiti fondamentali dei cuscinetti assiali – radiali UNITEC serie RTB. L’impiego di gabbie assiali ad elevato numero di corpi volventi con contatto lineare, oltre all’elevatissima precisione delle lavorazioni meccaniche, contribuisce ad ottenere un movimento preciso e rigido. Le dimensioni dei rulli, sia assiali che radiali, e degli anelli interno ed esterno sono calibrate in modo tale che al serraggio delle viti di ssaggio si ottengano i precarichi previsti. Le tolleranze, del valore del precarico sono particolarmente...

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RTB-Bearings/Unitec Bearings-8

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE Bearing assembled in housing and model for FEM analysis Schema di montaggio del cuscinetto e modello analisi FEM MOUNTING WITH THRUST WASHER (VSP) - MONTAGGIO CON RALLA DI SUPPORTO (VSP) In case a thrust washer is used in the assembly of the RTB bearing, the correct axial setting have to be evaluated. In this case, for any needed support, please contact our technical department. Nel caso di utilizzo della ralla di supporto, il cuscinetto RTB viene congurato a richiesta, valutando il corretto valore di registrazione assiale. Per ogni necessaria...

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RTB-Bearings/Unitec Bearings-9

STIFFNESS VALUES - VALORI DI RIGIDEZZA Stiffness values of rolling elements in preloaded conditions Rigidezze relative ai soli elementi volventi in condizioni di precarico teorico Stiffness values of a complete assembled bearing (°) Rigidezze relative al cuscinetto completo in condizioni di installazione di riferimento (°) Sigla Code Radial stiffness Rigidezza radiale Axial stiffness Rigidezza assiale Tilting stiffness Rigidezza momento ribaltante Radial stiffness Rigidezza radiale Axial stiffness (1) Rigidezza assiale (1) Tilting stiffness Rigidezza momento ribaltante KoRD (kN/μm) KoAX (kN/μm)...

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RTB-Bearings/Unitec Bearings-10

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE 3. ASSEMBLY INSTRUCTIONS As for assembly, we recommend to follow specications indicated in gure 3.1. Usually, tolerances can lead to different mounting situations such as deection or misalignments according to bore/outer diameter of bearings. 3. INDICAZIONI PER IL MONTAGGIO RTB Per il montaggio si suggerisce di rispettare le prescrizioni indicate nello schema riportato in gura 3.1. In generale questi campi di tolleranza possono portare ad avere, in funzione della corrispondente dimensione del foro/diametro esterno del cuscinetto, una situazione...

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RTB-Bearings/Unitec Bearings-11

Fig. 3.1 RTB assembly instructions Indicazioni di montaggio per RTB

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RTB-Bearings/Unitec Bearings-12

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE The preload of the bearings increases the stiffness and the rotational accuracy. In presence of a load from the outside, the preload of the bearing eliminates or avoids the clearance corresponding to the elastic yielding due to the load itself. In this case, for a given range of loads, the elastic deformations caused by the load are smaller rather than in a non-preloaded bearing. Assuming approximately the stiffness is linear (rollers in contact with tracks) at the same axial load, the axial deection is smaller in a preloaded bearings system rather...

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RTB-Bearings/Unitec Bearings-13

with preload con precarico without preload senza precarico Fig. 4.1 (1) System without preload - sistema senza precarico (2) Preload diagram - sistema con precarico Fo Fx = System with preload Fo - forza assiale esterna = Axial deection - spostamento assiale

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RTB-Bearings/Unitec Bearings-14

RTB TECHNICAL SPECIFICATIONS SPECIFICHE TECNICHE As for the bearings, the friction depends on many factors, the most important of which are: preload viscosity and amount of the lubricant applied load bearing size rpm Nei cuscinetti la resistenza complessiva al moto dipende da molti fattori, i più importanti dei quali sono: precarico viscosità e quantità del lubricante carico applicato dimensione del cuscinetto velocità di rotazione i.e.: A bigger preload turns out in a bigger rolling friction torque Tightening values affect considerably friction values. As for RTB bearings the xing of the inner...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.