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P+MU Series - Wormgearboxes with primary reduction

P+MU Series - Wormgearboxes with primary reduction

Product catalog summary

General Features
The U-MU series of worm gearboxes by SITI S.p.A. features a square design with die-cast aluminum housing, facilitating easy cleaning in challenging environments. These gearboxes offer versatile installation options with multiple connecting flanges.

Design Features

Toothing Profiles: Designed for smooth and silent operation.
Aluminum Housing: Modern design with excellent surface finish, eliminating the need for painting.
Taper Roller Bearings: Standard on input shafts from size U75, optional on output shafts.
Output Flanges: Designed for universal or modular assembly.

Reversibility and Irreversibility
The gearbox's reversibility is influenced by efficiency factors such as helix angle and machining precision. Irreversibility is defined by the gearbox's inability to be driven from the slow shaft.

Technical Data and Performance
Includes detailed technical data tables, lubrication requirements, and performance data for various motor configurations. It also covers maximum allowable external loads and dynamic/static load capacities.

Product Variants
The U-MU series includes standard worm gearboxes, those with primary reduction units, and combined worm gearboxes, each with configuration options and performance tables.

Accessories and Spare Parts
Available accessories include single and double output shafts, torque arms, protective covers, and spare parts.

Specifications
The gearboxes feature "ZI" involute toothing profiles, with efficiency largely dependent on the helix angle. Larger angles result in higher efficiency and lower irreversibility.

Static and Dynamic Irreversibility
Static irreversibility occurs when a gearbox cannot be rotated through the output shaft under high torque. Dynamic irreversibility is necessary to stop and hold a load without a brake.

Technical Data
Parameters for worm/wormwheel pairs include the number of worm starts, helix angle, normal module, and static efficiency. New transmission ratios are introduced.

Lubrication
Pre-lubricated with synthetic oil, eliminating maintenance needs. The synthetic oil used is SHELL TIVELA SC 320.

Lubrication and Performance of Wormgearboxes
Introduction: Discusses advantages of synthetic oil over grease, offering improved lubrication efficiency and a broader operating temperature range.

Specifications of SHELL TIVELA SC 320:
Includes volumic mass, kinematic viscosity, pour point, viscosity index, flash point, and FZG test results.

Compatibility Notes:
SHELL TIVELA SC 320 is incompatible with mineral oils, nitrocellulosic paints, and natural rubber seals.

Performance Tables:
Expanded for easy reading, differentiating between gearboxes with and without motors.

Mounting Position:
Specific lubrication is required for many positions to ensure normal service life.

Operating Conditions:
Using wormgearboxes at 2800 RPM is possible within specified torque limits.

Specifications
Outlines maximum allowable external radial and axial loads, with interpolation required for different reduction ratios.

Load Correction:
Formula provided to calculate maximum allowable radial load based on distance from the shaft shoulder.

Bearings:
Taper roller bearings can be fitted on the output shaft for higher loads.

Dynamic and Static Loads:
Wormgearboxes can withstand higher static loads than those allowed in rated conditions.

New Reduction Units:
Primary reduction units are made of die-cast aluminum with B14 flanges, minimizing space requirements.

Materials and Design:
Primary reduction units feature a modern design with B14 flanges, available in ratios of 3 and 4.

Lubrication:
Units with motors are pre-filled with synthetic oil ISO VG 320.

Mounting Positions:
Specific lubrication is required for many positions to ensure normal service life.

Performance Data:
Performance tables are divided into versions with and without motors, with input speeds specified.

Reduction Unit Setups:
Lists possible combinations of reduction units, with special notes for motor assembly angles.

Specifications
Provides specifications for components such as output shaft diameter and direction of rotation.

Mounting Position:
Specific lubrication is necessary for many positions to ensure normal service life.

Terminal Box Position:
Position must be specified during order for special requirements.

Motor Attachment for Combined Gearboxes:
Kits available for combining U-MU worm-gear reducers, with assembly instructions provided.

Performance Tables:
Highlights the importance of not exceeding maximum permissible output torque.

Recommendations:
Use high input power values for combined units with motor to prevent exceeding allowable torque.

Catalog excerpts

P+MU Series - Wormgearboxes with primary reduction-1

SPA SOCIET ITALIANA TRASMISSIONI INDUSTRIALI . >

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P+MU Series - Wormgearboxes with primary reduction-3

SITI S.p.A. La ringrazia per la fiducia accordata e Le ricorda che il Suo riduttore il risultato di un lavoro di miglioramento del prodotto che i nostri tecnici perseguono continuamente, gra- zie ad una ricerca costante nel settore.La rete di Assistenza a Sua disposizione peraiutarLa a risolvere dubbi che potessero sorge- re nella lettura di questa pubblicazione.E訒 vietata la riproduzione, la memorizzazione olalterazione, anche parziale, di questa pubbli- cazione, senza una autorizzazione scritta da parte della SITI S.p.A. We, at SITI S.p.A., would like to thank you for the confidence shown in...

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P+MU Series - Wormgearboxes with primary reduction-5

PREMESSAIl presente catalogo relativo ai INTRODUCTIONSITI S.p.A. proudly introduces our series ofsquare VORWORTDieser Katalog bezieht sich auf riduttori a vitesenza fine serie U-MU Schnecken-untersetzungsgetriebe Typ U-MU U-MU , con corpo a forma qua-drata, costruiti dalla SITI S.p.A. I riduttori della serie sono caratterizzatidai corpi in lega di alluminio dal design moder- no, appositamente studiate per facilitare le ope- razioni di pulizia anche negli ambiente pi osti- li. Il fissaggio universale e le molteplici flange di collegamento, rendono questi riduttori partico- larmente versatili e...

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P+MU Series - Wormgearboxes with primary reduction-6

DESIGN FEATURES1 - TOOTHING PROFILESMating profiles of worm and wormwheel inbronze are ZIӔ (profile with involute sec- tion); This gives rise to a gradual, constant and shockless matching in the rolling of mating profile throught all the possible running con- dition. Wormgearbox running is much more silent and free of vibrations.2 - ALUMINIUM PRESSURE DIE CASTEDHOUSINGPressure die casted aluminium housing ofvery modern design are used. The excellent surface finishing makes paint- ing unnecessary, and therefore it is omitted. 3 - TAPER ROLLER BEARINGS ON THE IN-PUT SHAFTFrom U75 onwards, tape...

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P+MU Series - Wormgearboxes with primary reduction-8

Irreversibilit dinamica Dynamic irreversibility Dynamische Selbsthemmung la condizione piȹ difficile da ottenere. Essa si verifica quando, al cessare delle cause che mantengono in rotazione la vite, cessa istan- taneamente il moto di rotazione dellalbero len- to. LҒirreversibilit dinamica quella condizione in cui ਨ necessario arrestare e trattenere il carico anche senza lintervento di un freno. Detto RD il rendimento dinamico, la condizione teorica perchҨ si verifichi lirreversibilitҠ dina- mica la seguente: RD < 0.5La condizione inversa, cio la reversibilit訠 dina-mica, ha luogo quando RD > 0.5...

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P+MU Series - Wormgearboxes with primary reduction-9

TECHNICAL DATA TABLEThe table here below gives the typical pa-rameters of worm/wormwheel pairs. The fol- lowing data are given one after the other. a)The number of starts of the worm (z TABELLA DATI TECNICINella tabella sono riportati i parametri caratteri-stici dei riduttori a vite senza fine. Vengono rappresentati in ordine a)il numero di principi della vite (z 1 ) dal qualesi desume il numero di denti della corona (z 1 )which even the number of teeth of the wormwheel (z a )Windungen der Schnecke (z 1 ), aus denendie Anzahl der Schneckenradzhne ent-nommen werden kann, wozu man die Zahlder Zhne...

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P+MU Series - Wormgearboxes with primary reduction-10

PROPRIET TIPICHE OLIOSHELL TIVELA SC 320:Massa volumica (kg/dmc)1.052Viscosit cinematica a 40 C337 cSt Punto di scorrimento-42 аC Indice di viscosit 242 Punto di infiammabilit (c.o.c)290 ࠰C Prova FZG supera lo stadio> 12NOTANon pu essere mescolato con oli minerali ed incompatibile con le vernici nitrocellulosiche e le guarnizioni di gomma naturale. LUBRICATIONAll the wormgearboxes series U-MU are sup-plied already pre-lubricated by SITI, and are missing the oil plugs, since the lubricant used is ⨓lifetime, in other words it does not require any maintenance during the wormgearboxes life. Synthetic...

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P+MU Series - Wormgearboxes with primary reduction-12

RIDUTT ORI E MOT ORIDUTT ORI A WORMGEARBOX AND WORM- SCHNECKENUNTERSETZUNGS- VITE SENZA FINE SERIE U-MU GEARED MOT ORS SERIES U-MU GETRIEBE UND -GETRIEBEMOT O- REN TYP U-MU > DESIGNAZIONE CONFIGURATION TYPENBEZEICHNUNGEN Tipo Grandezza Versione Pos. di mont. Type Size Version Mount. pos. Other indicat. Typ Grsse Ausfhrung iAltre indicaz. Einbaulage Weitere Angaben F63U 10* B3 > 57,510152025 304050 6070 80100 B3V5 B8V6B7 B6 U > 405063 7590110 PAM MU (PAM) 19/200 > **F**FBRFBM***FBML Poli - Poles kW 1 Polig VoltHz 0.37 4 220/38050 MU > (con motore) (with motor) (mit Motor) *Il rapporto 5 漨 disponibile...

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P+MU Series - Wormgearboxes with primary reduction-13

POSIZIONI DI MONTAGGIOSi consiglia di prestare la massima attenzionealla posizione di montaggio in cui si trover a lavorare il riduttore. Per molte posizioni, infatti, prevista un਒apposita lubrificazione del riduttore e dei cuscinetti, senza la quale non garantita la normale durata del riduttore stesso. In man- canza di indicazioni specifiche il riduttore verr fornito idoneo per il montaggio standard B3. MOUNTING POSITIONWe recommend paying the utmost attentionto the gearbox installation and operating position. For many positions, in fact, a specific lubri- cation of the gearbox and its bearings...

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P+MU Series - Wormgearboxes with primary reduction-14

HOW TO READ THE PERFORMANCE TA-BLESThe tables of performance of singlewormgearboxes, have been windened, in order to make them suitable to an easy read- ing, even in case of special applications, or applications out of the standard.First of all, a differentiation has been cariedout between the performance of gearboxes without motor and gearboxes complete with motor.In case of gearboxes complete with motor, ithas been taken account of the possible PAM- arrangements of each gearbox size and each ratio, and the max. input power allowed at each input speed n IMPOSTAZIONE E LETTURA DELLE TABEL-LE...

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P+MU Series - Wormgearboxes with primary reduction-15

In fact, when input speed is as high as 2800RPM, a few potential problems, like the tem- perature achieved inside the gearbox, start of vibrations or noise, trend to grow.As a general rule, we recommend the use ofwormgearboxes at 2800 RPM input speeds (2 poles motors) only in applications having a relatively low service factor (1.25 max.)and a very low degree of intermittency.The use of n Quando la velocit di ingresso pari a 2800 giri/min, accennano a esaltarsi alcuni problemi, come la temperatura raggiunta all਒interno del riduttore in condizioni operative e la tendenza allinnesco di vibrazioni...

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