Principle of self aligning

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Principle of self aligning

  1. 1. Sunil sharmasuraj karn prakashsusheel palt.aslamd.thamotharanSubmitted by:PrinciplesOfSelfAligning AndMethodsOfIncreasingRangeOf Regulation.Department of manufacturing engineeringANNAMALAI UNIVERSITYBATCH’B’Viii semester
  2. 2. INTRODUCTION A continuously variable transmission(CVT) is a transmission that can changesteplessly through an infinite number ofeffective gear ratios between maximumand minimum values. This contrasts with other mechanicaltransmissions that offer a fixed number ofgear ratios. The flexibility of a CVT allows the drivingshaft to maintain a constant angularvelocity over a range of output velocities.3
  3. 3. ADVANTAGES This can provide better efficency than othertransmissions by enabling the operation torun at its most efficient revolutions perminute (RPM) for a range of operatingspeeds. Alternatively it can be used to maximize theperformance of a machine by allowing themachine to turn at the RPM at which itproduces peak power. This is typicallyhigher than the RPM that achieves peakefficiency.4
  4. 4. APPLICATIONS Many small tractors for home and gardenuse have simple rubber belt CVTs Combine harvesters have CVTs. Thisallows the operator to slow or accelerate asneeded to accommodate variations inthickness of the crop. Some drill presses and milling machinescontain a pulley-based CVT where theoutput shaft has a pair of manually-adjustable conical pulley halves throughwhich a wide drive belt from the motorloops.5
  5. 5. PRINCIPLES OF SELFALIGNINGinitial pressureproduced by theweight of a powerdisc is very small
  6. 6. Let P= initial friction force produced between disc and roller
  7. 7. STEPLESS REGULATIONCAN BE CARRIED OUT BY ELECTRICAL SYSTEM ELECTRONIC SYSTEM HYDRAULIC SYSTEM MECHANICAL FRICTION DRIVE ANDPRESSURE VARIATOR
  8. 8. ADVANTAGES OF STEPLESSREGULATION SYSTEM: No loss in speed Can arrange speed adjustment withoutstopping machine. It reduces time losses and very useful inautomatic tool Hydraulic drive avoids speed fluctuation
  9. 9. methods of Increasing range ofregulation1.BY USING MANYVARIATORSOnly beltdrive andgear driveis used
  10. 10. CHARACTERISTICS Here we donot use the full possibility of3 variators. Too many speeds can be repeated. The system is not very much usedbecause we donot get many number ofspeed.
  11. 11. 2.COMBINATION OFVARIATORS WITH GEAR BOXES
  12. 12. CHARACTERISTICS Shaft 1st can have one constant speed. Shaft 2nd have a particular range of speeds. About shaft 3rd, three different speeds reducedby gear ratios corresponding to any point on2nd staff.>>DIFFICULTIESIf the initial range is big then the ratio cant beachieved as the gear box has its influence
  13. 13. 3.VARIATORS WITHEPICYCLIC MECHANISM:
  14. 14. >DISADVANTAGES>complicated to manufacture.>can not be used in high speed.>low efficiency if high range is produced.>used only in feed drives.
  15. 15. ACKNOWLEDGEMENT:>Design of Machine Tools, Basu S.K., andPal D.K.>Machine tool Design and NumericalControl, Metha N.K.>GOOGLE SEARCH ENGINE
  16. 16. THANK YOU

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