Hydraulic Motors, Rol-Seal Units RSA, RSB, RSC, & MRS ...

1 Introduction:This document contains the specifics we publish for all five models in theRol- seal Hydraulic motor family. This includes the three size/mountingvariations of our original design (RSA, RSB and RSC models) plus our twoMRS models (MRSA and MRSAA). The MRS design is a modified configuration that yields Units intended forsmall space applications that require the combination higher speeds andlower you need information beyond what we ve included here, please contact ourfactory engineers so we can provide you with whatever else you Line OverviewFeatures & Benefits RSA, RSB, RSC ..2 Features & Benefits MRS ..3 Performance Comparisons (complete line).

2 4 RSA & RSB Series SpecificsTorque Ranges/Displacements ..5 Dimensional Drawnings, Configurations, Options ..7 RSC Series SpecificsTorque Ranges/Displacements ..10 Dimensional Drawnings, Configurations, Options ..11 RSA, RSB & RSCG eneral Maintenance ..13 Brakes ..13 Planetary Gearboxes ..14 Model/Order Nomenclature ..15 MRS Series SpecificsMRSA Dimensional Drawings and Configurationswith seal & Foot Mount Options ..16 MRSAA Dimensional Drawings and Configurations with seal & Foot Mount Options ..18 Output Shaft Options for MRSA & MRSAA ..20 General Maintanance & Model/Order Nomenclature .. Motors, Rol-Seal UnitsRSA, RSB, RSC, & MRS Series TECHNICAL DATAENGLISH.

3 (For Metric data, see )Von Ruden Manufacturing Buffalo, MN Fax Phone 1 of 22 Hydraulic Motors, Rol-Seal UnitsRSA, RSB, RSC, & MRS Series TECHNICAL DATAENGLISH. (For Metric data, see )Von Ruden Manufacturing Buffalo, MN Fax Phone 2 of Von Ruden introduced the firsthydraulic motors built on our RotaryAbutment principle, their performanceand durability advantages wereobvious. Today, that same set ofbenefits are just as valid. Regardless ofsize, each model delivers:1. High Starting Torque:Typically thisis in the 92-94% range. That meansoverall Hydraulic systems savingsbecause designers can use smallermotors.

4 Higher starting torque alsomeans increased vehicle gradeabilityand more drawbar High Running Torque:Friction lossand viscous drag at high speed areboth lower due to the internal rollingcontact seal elements. Large flowpassages reduce internal pressuredrop. Typical breakaway pressure at ano load condition is less than 10 More Useable Speed:Smoothrunning at low speed (less than 10 RPM) with minimal performance lossat high speeds (up to 3,500 RPM).Smooth performance over an unusuallywide speed range. Low speedcharacteristics often eliminate the needfor additional speed Long Life:Performance staysrelatively constant over the motor sworking life.

5 The internal rolling sealelements are essentially frictionless and wear compensating. The rolling sealelement design also tolerates a highdegree of contamination so the motorsperform well in PressureRotor & Abutment Valve Cross SectionPORT A Rotor will turn clockwise with pressure applied to Port A as ABUTMENTS allowrotor tips to pass betweenhigh and low pressureareas during gears (not shown)keep rotor and abutmentsin proper PINS provide rolling contact PLATES maintain sealing contact with rotary abutments. Holes in sealplates allow Hydraulic pressure to force seal plates out against FEW WORDS ABOUT OUR Rol-Seal RSA, RSB & RSC motor DESIGNLow Pressure Hi Pressure Rotor & Abutment Valve Cross SectionSEAL PLATEPINS separatehigh and lowpressure areasbetween sealplate and Rol-Seal s Rotary Abutment Advantage.

6 The positive contact provided by rolling seals between rotor and housing and between abutments and seal plates creates relatively frictionless operationthat makes these motors relativelyinsensitive to wear over theirexceedingly long working Motors, Rol-Seal UnitsRSA, RSB, RSC, & MRS Series TECHNICAL DATAENGLISH. (For Metric data, see )Von Ruden Manufacturing Buffalo, MN Fax Phone 3 of A Rotor will turn clockwise with pressure applied to Port A as FEW WORDS ABOUT OUR Rol-Seal MRS SERIES DESIGNLow Pressure Hi Pressure Rotor & Abutment Valve Cross SectionLow PressureHigh PressureRotor & Abutment Valve Cross SectionROTARY ABUTMENTS allow rotor tips to pass by during rotation.

7 Separate high and low pressure gears (not shown) keeprotor and abutments in proper decades, Von Ruden s Rol-Seal Rotary Abutmenthydraulic motors have been the perferred choice fordesigners working on applications where normalmotorsproduce marginal or unsatisfactory results. Our MRSseries Units have been specially modified to deliver muchhigher speeds than their larger RSA, RSB, & RSC Rol-Sealcounterparts while maintaining many of the otheradvantages of those larger Units . 1. More Useable Speed:These motors run smoothly withminimal performance loss at continuous speeds up to6000 RPM.

8 Their low speed characteristics often eliminatethe need for additional speed reduction. Typical breakawaypressure at a no load condition is less than 10 Higher Starting Torque:Typically this is in the 80-84%range. That means overall Hydraulic systems savingsbecause designersoften can get the start-up characteristicsthen need with these smaller-displacement MRS Higher Running Torque and Radial Load Capacities:Though MRS Units are relatively low displacementmotors, they are suprisingly robust. Radial loads up to300 lbs are standard and continuous torques from 105 to478 lb. in. can be produced.

9 Large flow passages reduceinternal pressure drop. 4. Long Life:Performance stays relatively constant overthe motor s working life. A Double seal configuration thatprovides extra protection in dirt or dust-laden environmentswithout increasing their overall space requirements Motors, Rol-Seal UnitsRSA, RSB, RSC, & MRS Series TECHNICAL DATAENGLISH. (For Metric data, see ) Ruden Manufacturing Buffalo, MN Fax Phone 4 of 22 When accuracy and precise repeatability are your application sprimary concern, you should consider our line of Axial Vanehydraulic motors. Contact your Von Ruden representative or download completedata on any of these other motors from our web : 1.

10 Intermittent conditions must be less than 10% of every Inlet and return pressures are not to exceed ratings listed lbs1250 (in3/rev)lb-in2 : 1. Based on load located .5 from mounting Based on load located 1 from mounting Based on load located from mounting RADIAL AND THRUST LOAD CAPACITYROTATIONAL MOMENT OF INERTIA (WK2)DISPLACEMENT (in3/rev.)Models MRSA & MRSAAM odels RSA & RSBM odel (GPM) SpeedContinuous6000600060006000600060006 0002000 1500 10007501500 1200900(RPM)Intermittent7000700070007000 7000700070003500 3000 2500 18002000 1700 1400 PressureContinuous3000300030003000250025 0025002500 2250 2000 20002000 2000 2000(PSI)Intermittent4000400040004000350 0350035003000 3000 3000 30003000 3000 3000 Peak50005000500050004500450045003750 3750 3500 35003500 3500 3500 Max.