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RS-RT Servo

RS-RT Servo
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A*.' I^H HI^HHR rftF\°rfT™ 'mLMbBm " *MOTION CONTROL SINCE 1955 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. Technology Made in Italy

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SERVO, IEC & NEMA GEARHEADS Worm speed reducers

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Servo Gearheads - RS & RT Product Description Multipurpose mounting Aluminium die cast (up to size 85) and Cast iron (from size 110 up) Wormshafts ZI profile, Hardened and ground. Alloy steel. Input Servo , IEC and NEMA motor adapters and Universal Flexible Coupling Wormwheels Bronze alloy cast onto a cast iron hub. RT Bearings Ball or roller types. Tapered roller bearings For heavy duty operation. Oil seals Nitrile Butadiene Rubber - NBR as standard; Viton and Silicone on request. Output Hollow bore as standard; Single or Double solid shaft on request. Modular attachments Helical one stage...

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RS & RT - Servo Gearhead Duty Cycle Duty Cycle Actual duty cycle investigation is the basic rule in servo gearhead selection. A basic operational duty cycle can be pictured as follows: Torque Nm T2 max T2 mid - Max. speed - Average speed - Acceleration time - Working time - Deceleration time - Pause time - Max. acceleration torque - Working torque - Deceleration torque The duty cycle fixed up, then operation has to selected as: - Continuous (S1) - if Sp> 60% - or St > 20 minutes or - Intermittent (S5) - if Sp< 60% - or St < 20 minutes where: SP - per cent duty time St - duration duty time...

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Servo Gearheads - RS & RT Duty Cycle Continuous duty - S1 Duty is meant continuous when per cent working time is greater than 60%, or duration longer than 20 minutes. In such cases, gearbox selection is made according the formulas: - Nominal output torque - Nominal motor torque - Nominal output torque according to ISO 6336 - Equivalent speed resulting from single speeds coming from duty cycle Intermittent duty - S5 Duty is meant intermittent when per cent working time is lower than 60%, or duration shorter than 20 minutes. In such cases, gearbox selection is made according the formulas: -...

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RS & RT - Servo Gearhead Duty Cycle Shock Factor Shock factor is a service factor keeping into account rapid motion inversions associated with quick acceleration times; it is very important to consider this service factor when sizing the gearbox. - Shock service factor - Number of cycles per hour

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Servo Gearheads - RS & RT Flexible Coupling Reducer half-coupling Material: steel 20MnCr5 Input shaft built-in Two bearing set Unchanged casing dimensions Spider External tooth connection Material: Thermoplastic Elastomer - Elastollan ® TPU - Polyurethane - Hytrel ® TPE - Polyester Hardness - TPU 98 Shore A - TPE 72 Shore D Temperature - TPU -20/+75°C (-4 / +167°F) - TPE -30/+100°C (-22 / +212°F) Motor half-coupling Material: Advantages: One gearbox only at input for each reduction ratio Greater flexibility Increased stock rotation Fretting corrosion elimination between key and keyway Zero...

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RS & RT - Servo Gearhead Flexible Coupling Mt - Screw locking torque Mt1 - Transmissible torque with key Mt2 - Transmissible torque without key Servo bore availability: ask for confirmation Servo flange: see by reducer size on following pages

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Servo Gearheads - RS & RT Order Designation INPUT TYPE MOUNTING POSITION RATIO Catalogue RS-RT: S - Without Motor Flange Catalogue RS-RT OPTIONS AS/AD BR/BRV CS F GRM LNS TLE/TLI VB - Single / double sided solid output shaft - Plain / Vulkollan-bush torque arm - Not standard output bearings - Additional output flange - Reduced end play - Not standard lubrication - Internal / external torque limiter - NDE (not drive end) worm shaft extension Unless otherwise requested, the fitting side of output flanges and optional items is as standard the right side of the gearbox when seen from input....

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RS & RT - Servo Gearhead Electronic Catalogue Modularity and flexibility have been leading the design of Varvel products since 2000. The gearbox-kit concept was carried out allowing anyone to assemble the unit in a few minutes with standard tooling. This feature provides the highest flexibility to Varvel’s distributors and resellers who - thanks to a limited kit selection - are able to immediately configure the required product. VARSIZE® selection programme, available from our site www.varvel.com allows easy sizing selection from the Varvel product range. 2D/3D Drawings A guided selection...

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i - Reduction ratio (real ratios) T2aCc - Max. output acceleration torque (S5 duty - max. 1000 cycles/hour) T2iso - Nominal output torque according to IS06336 (S1 duty - continuous operation) T2max - Emergency output torque (max. 1000 times on gearbox lifetime) Ct - Torsional rigidity (on demand) Fr2 - Output radial load (OHL) Fa2 - Output axial load

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