GM Series
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Catalog excerpts

HIGH SPEED HIGH TORQUE RADIAL PISTON HYDRAULIC MOTORS

TECHNICAL CATALOGUE CATALOGO TECNICO INDEX INDICE 2 MOTOR DISPLACEMENTS / CILINDRATE MOTORI 4 GENERAL INFORMATION / INFORMAZIONI GENERALI SAI Spa -41122 - Modena Italy - www.saispa.com - e-mail saispa@saispa.it

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TABLE OF DISPLACEMENTS / TAVOLA DELLE CILINDRATE Peak power / Potenza picco kW 20 20_33 33 33_33_33 33_33 Peak power / Potenza picco kW 48 48_48 48 48_48_48 48_48 Peak power / Potenza picco kW_59_59_59_59_59_59_59_59 Peak power / Potenza picco kW_80_80 80 80_80_80 80_80 it= Preferred motor type / Morote preferito SAI Spa -41122 - Modena Italy - www.saispa.com - e-mail saispa@saispa.it

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TABLE OF DISPLACEMENTS / TAVOLA DELLE CILINDRATE Specific torque / Coppia spec. Nm/bar_26,40_33,20_39,20_47,50_ Cont. Pressure / Press. Cont. bar_250_250_250_250_ Peak pressure / Press. Picco bar_450_400_350_300_ Peak power / Potenza picco kW_170_170_170_170_ it= Preferred motor type / Morote preferito SAI Spa -41122 - Modena Italy - www.saispa.com - e-mail saispa@saispa.it

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Crankshaft design radial piston motors The main characteristics of this type of design are high mechanical efficiency, especially at start up, and high volumetric efficiency. A number of features distinguish SAI motors from other radial piston designs: Motori idraulici ad albero eccentrico Le caratteristiche di questo tipo di motore sono il rendimento meccanico, in particolare alio spunto, ed Le caratteristiche che distinguono i motori SAI rispetto ad altri motori di questo genere sono: Swivelling cylinder: the cylinder (1) remaining aligned with the eccentric of the crank (3), eliminates...

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GM series motors are the result of many years of experience gained with the prior M, L and P series motors, and incorporate a number of design Variations with respect to these series intended to increase the srength of the motor casings and the load capacity of the internal dynamic components. The result is a series of motors with high continuous power ratings, featured by reduced internal specific loads and high mechanical and volumetric efficiency, That contribute to decrease the heat generated and consequently even the negative effect associated with it. I motori della serie GM sono...

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PRESSURE RATINGS GM-series motors are rated at a nominal continuous pressure rating of 250 bar and up to 450 bar peak pressure. The continuous and average operating pressure, however, should be chosen in function of the required service lifetime (see bearing lifetime graphs). The motors may work at peak pressure for periods not exceeding 1% per minute, no more than Product of speed and working pressure must be BACK- PRESSURE The motors are capable of operating with high back- pressures with high efficiency, e.g. for series circuit The allowable pressures vary in function piston diameter and...

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For applications containing at least two drive units that require 2-speed operation, SAI can supply the flow control valves for a series-parallel circuit with speed differential also in series mode. The series-parallel directional valve Dv5 (3) enables dynamic switching from parallel circuit configuration (high torque, low speed) to series configuration (high Per application '! con almeno 2 motori nelle quali e richiesto il funzionamento a due velocita si consiglia il circuito serie-parallelo con velocita differenziabile anche in serie. La valvola direzionale serie-parallelo Dv5 (3)...

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DISCONNECTION FROM HYDRAULIC CIRCUIT The motors can be disconnected from the hydraulic circuit and driven externally (freewheeling, free fall, in case of breakdown, etc.) at speeds of up to the The diagrams below show three possible circuit configurations for motor disconnection and/or for I motori possono essere scollegati dal circuito idraulico ed essere azionati esternamente (funz. a ruota libera, caduta libera pesi, movimentazione veicolo in avaria, ecc.) fino alia velocita massima indicata nelle tabelle. I diagrammi indicano tre configurazioni di circuito per funzionamento a ruota...

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The choice of oil should be made so that the viscosity of the oil lies within the given range at its normal operating temperature. Viscosita dell'olio: ottimale 40 cSt a 60 cSt utilizzare il fluido idraulico in modo che la viscosita rientri nella gamma indicata alia temperature ALTERNATIVE FLUIDS - Synthetic fluids: (Fosfate esters, polyesters,...) These fluids have similar properties to mineral oils and the same pressure, speed, temperature and viscosity ratings apply. These fluids may require seals made of a different material (e.g. Viton), which are available on request. -Water-based...

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DRAIN-LINE POSITIONING The dsitioned in such a way that there is always sufficient oil in the casing for the lubrication of the dynamic components in the If the motor is installed with the shaft in a horizontal position, the drain-line should be connected to the under mid tank drainline port. diameter corresponding to the size of the drain line port and flow must not be obstructed by sharp corners, Standard motors are supplied with drain port Y closed (zinc plated HH - plug) and drain port X open (with plastic plug). Motors can be supplied with Y-open, POSIZIONAMENTO DEL TUBO DI DRENAGGIO...

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The bearing lifetimes given in this catalogue are L10 lifetimes. The L10 lifetime is the period of work after which 10% of the bearings can be expected to show signs of wearing. The average lifetime of the bearing, the L50 lifetime (where 50 % of the bearings show signs of wearing), is approximately 5 times the To determine the lifetime of the bearings in an application, constant or average pressures and speeds should be used, not peak or max values. The continuous operating pressures of any motor should be chosen in function of the required motor La durata dei cuscinetti calcolata con I...

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BEARINGS TYPE roller bearings rulll cilindrici spherical roller bearings FG reinforced spherical roller bearings rulli a botte rinforzati SAI provide's a bearing life calculation software,"Vita" which, according to a specific duty cycle,determines the bearings lifetime of all suitable motors for the application. La SAI fornisce un software per il calcolo della vita dei cuscinetti ,"Vita",che,in funzione di uno specifico duty cycle,determina la durata dei cuscinetti di tutti quei motori idonei all'applicazione. bearings life calculation Vita 4: calcolo della durata dei ORDER CODE EXAMPLE...

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