gearless transmission
TRANSCRIPT
MAJOR PROJECT
A presentation onGEARLESS POWER
TRANSMISSION SYSTEM
BY•Himanshu Singh UID: K10481
OVERVIEW
• What is gearless transmission?• Need of gearless transmission.• Applications• Comparison• Materials• Specification and manufacturing of parts.• Advantages• Limitations• Possible advances• Conclusion
What Is Gearless Transmission?
• Also called elbow mechanism
• It is an ingenious link mechanism of slider and kinematic chain principle.
• Transmits power at any angle without utilising gears
Need Of Gearless Transmission
• Today’s world requires speed on each and every field.• Engineers are constantly confronted to the challenges of
efficient transmission of power.• Gears are costly to manufacture.• It is needed to further increase the efficiency of transmission
which cannot be done using geared transmission• Gearless transmission mechanism is capable of transmitting
power at any angle without any gears being manufactured.
Working Principle
• Transmits the power between two shafts whose axes are at 90 degree through bent links.
• Three links slide relatively according to the motion given to input shaft.
• Due to this, the rotational motion of input shaft is converted into sliding motion of links which is then converted to rotational motion of the output shaft.
GeneralLayout
Applications• Tower clocks
• Gang drilling (multi spindle drilling)
• Lubrication pump for CNC lathe
• Angular drilling between 0 - 90 degree
• Movement of periscope in submarines
• Used in vehicles (go-carts)
• Hand driven machines like juice makers sheet folding machines etc.
Geared v/s Gearless Transmission
GearedManufacturing
methods-• Costly.• manufactured on
special purpose machines
• Complex calculations
• No interchangeability
Gearless Manufacturing
methods-• Less costly.• No need of special
machines
• Less calculations
• Freedom of interchangeability
Geared v/s Gearless Transmission
Geared Cause of failure -• Pitting, corrosion,
erosion and fatigue have severe effect.• Replacement of entire
gear set needs to be done.
Gearless Cause of failure - • Pitting, corrosion,
erosion and fatigue effect less severely
• Replacement of defected pin only
Geared v/s Gearless Transmission
Geared Lubrication and
cooling-• Complex system• Cooling is a big
issue
Gearless Lubrication and
cooling• Simple• Easy to cool
Geared v/s Gearless Transmission
Geared Torque transmitting
capacity• Used in high torque
applications
• Different speed at any angle is not easily possible
Gearless Torque transmitting
capacity• Low torque applications
• Different speed at any angle is easily done
Geared v/s Gearless Transmission
Geared Efficiency• Due to friction hunting
and back lash efficiency cannot be more than 55%.
• Generally used for the applications where efficiency s less than 42%.
Gearless Efficiency• As very little friction plays
very while transmitting; the hunting and back lash one absent
• Efficiency as high as 90% to 92% is possible in gearless transmission mechanism.
Materials S. No. Part
nameMaterial Quantity
1 Cylinders MS 22 Bearings CI 43 Shaft MS 24 Bent links MS 35 Frame MS 1
ADVANTAGES
• Complete freedom of Interchangeability.• More efficient than gear.• Power could be transferred to any desired angle.• Ease of manufacturing.• Misalignment of shafts can be tolerated to some
extent.• Simpler cooling system• Low cost of manufacturing.• Portability of parts.
LIMITATIONS
• Does not work at very low starting torque.
• Improper hole drilling could pose much problem.
• Sudden load would cause mechanism breakdown.
• Links are to be replaced after certain cycle time.
• Speed ratio is always constant 1:1.
Future Aspects
• Torque bearing capacity can be improved.
• Flexible bent links can be used.
• Has a bright future in automation and robotics.
• Can be used in automobile industry in near
future.
Conclusion
• The model works correctly as per the design• With the help of this system, we can efficiently
reduce the cost in power transmission and • Further advancement in this technology can be
made.
THANK YOU.