RN RO RV
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MOTION CONTROL SINCE 1955 technology made in Italy

Technology Made in Italy Since 1955 Varvel has been making speed reducers and variators for light industry applications. Reliable partner in power transmission equipment offers also customized solutions always according to a socially responsible company values. Modularity and flexibility lead Varvel products by a unique kit form, common to all gearbox series. This feature allows distributors an easier job to set up required products in few minutes.

RN-RO-RV PARALLEL SHAFT AND BEVEL/HELICAL GEARBOXES

RN-RO-RV Gearboxes Description The gearboxes, series RN, RO, RV are manufactured with a common housing that allows the same footprint for the three versions and are designed according to latest ISO engineering specifications with the help of computer aided structural analysis for displacement and stress field. The monolithic framework does not deflect under the effect of torque and external loads with effective results on sealing surfaces. The gearboxes of series RN, RO, RV are manufactured of pressure die cast for the first 3 sizes and of cast iron for the others. The shaft mount version,...

Gearboxes RN-RO-RV Description Parallel Shaft Gearboxes - Series RN Multipurpose Housing Foot & Foot/Flange Mountings One housing for 2- & 3-stages Housing & Covers Aluminium die cast (3 sizes); Grey cast iron (3 sizes). NEMA and IEC motor adapters with universal elastic coupling or customary bore and keyway. 20MnCr5 alloy steel; Case hardened. Profile ground or shaved. NBR - Nitrile Butadiene Rubber as standard; Viton and Silicone on request. Ball or roller types; according to sizes and technical requirements. Solid shafts, metric and imperial. Lubrication Synthetic long-life oil; Grade...

RN-RO-RV Gearboxes Description Bevel/Helical Gearboxes, 90 Degree Input -Series RO Multipurpose Housing Foot & Foot/Flange Mountings One housing for 3-stages Housing & Covers Aluminium die cast (3 sizes); Grey cast iron (3 sizes). NEMA and IEC motor adapters with universal elastic coupling or conventional bore and keyway. 20MnCr5 alloy steel; Case hardened. Profile ground or shaved. NBR - Nitrile Butadiene Rubber as standard; Viton and Silicone on request. Ball or roller types; according to sizes and technical requirements. Solid shafts, metric and imperial. Lubrication Synthetic long-life...

Gearboxes RN-RO-RV Symbols Application radial load Catalogue radial load (input) Catalogue radial load (output) Permissible radial load at position “X” on output shaft. Based on bearing lifetime. Permissible radial load same as Fr2b(x). Based on shaft bending and torsional stress. FS  Service factor Nominal reduction ratio Actual reduction ratio Moment of inertia of the gearbox at gearbox input shaft Moment of inertia of the application Moment of inertia of the motor Mass acceleration factor Transmission element factor Lubricant (litres) H - In-line mounting / V - 90 degree mounting...

RN-RO-RV Gearboxes Modular System

Gearboxes RN-RO-RV Modular System

RN-RO-RV Gearboxes Coupling "G" Description Reducer Half-coupling - Material: Steel - Input shaft built-in - Two bearing setting - Unchanged casing dimensions Spider - External tooth connection - Material: Thermoplastic Elastomer: Hytrel ® TPE - Polyester - Hardness 72 Shore D - Temperature range -30/+100°C (-22 / +212°F) Motor Half-coupling - Material: Alu pressure die cast (G3, G5, G6) Steel (GS8) Steel on demand (GS3, GS5, GS6) - Dynamic balancing - Fitting: Clamp (G3, G5, G6) Key (GS3, GS5, GS6, GS8) - Bores: IEC 72/DIN42948 NEMA C and TC Advantages: - One gearbox only for each ratio -...

Gearboxes RN-RO-RV “G” Elastic Coupling Selection - Screw locking torque - Transmissible torque with key - Transmissible torque without key - Coupling GS8: steel made, key fit and grub screw - Coupling GS8: any ID# marked on

RN-RO-RV Gearboxes IEC Flange & Coupling Selection Flange Type

Gearboxes RN-RO-RV NEMA Flange & Coupling Selection NEMA Frame Flange Type

Service factor FS1.0 is meant as typical of 8 hours/day operation, with uniform load and mass acceleration factor k(a) 2 0.2, starts/ stops lower than 300 per hour and ambient temperature between 15 and 35 Celsius. The performance shown in the tables gives the service factor calculation as a ratio between gearbox maximum output torque M2 and application torque M(apP). Load Class B - Moderate shock load C - Severe shock load A/h - Number of starts/stops per hour

Gearboxes RN-RO-RV Service factors DUTY TYPE of the motor The specifications of various duty types are defined by the Standard CEI EN 60034-1 / IEC34-1. S1 - Continuous duty Steady load operation for an indefinite period (N), but long enough to achieve ther-mal balancing. fs =1.0 N = Operation time c = Load t = Temperature S3 - Periodic intermittent duty Operation according to cycle (C) including steady load time (N) and rest time (R). Starts/stops do not affect temperature. The reference cycle (C) is up to a total of 10 minutes. Intermittence ratio is calculated as follows N N = Operation...

RN-RO-RV Gearboxes Mounting positions Foot mounting Montaggio a piedi Foot mounting Fußbauformen B5 Montaggio a flangia Flange mounting Flanschbauformen

Gearboxes RN-RO-RV Mounting positions

RN-RO-RV Gearboxes Mounting positions

Gearboxes RN-RO-RV Designation GEARBOX DESIGNATION IEC71 -B14 AU30 DFU200 Output flange ø ... Output shaft ø ... B5, B14 = Motor form Electric motor frame Reduction ratio H, V = Gearbox mounting position B3, B5, B3/B5 = Gearbox form Gearbox size and stages Tipo del riduttore (RN, RO, RV) M = Geared motor F = Gearbox with input flange S = Gearbox without input flange … = (nothing) Gearbox with input free shaft MOTOR DESIGNATION Class F (std) = Insulation class IP55 (std) = Protection class Voltage / Frequency B5 o B14 = Mounting form Number of poles Motor power MT = Three-phase motor MM =...

RN-RO-RV Gearboxes External Loads OUTPUT RADIAL LOADS Radial (overhung) loads have to be checked with the rating factor given in the gearbox selection tables. The k(t). rating factor will vary according to the transmission element fitted on the gearbox output shaft according to the below table. - Application radial load k(t) Transmission element Gear - Tooth No. < 17 Chain sprocket - Tooth No. < 13 Chain sprocket - Tooth No. < 20 Chain sprocket - Tooth No. > 20 V-belt pulley Toothed-belt pulley - Catalogue radial load at shaft centre - Radial load offset from centre Check both (*) and (**)...