A SEMINAR REPORT ON

GEARLESS TRANSMISSION SYSTEM

UNDER THE GUIDANCE OF:-

Prof. Kedarnath Hota(Dep. Of Mechanical engg.)

PREPARED BY:-ROHIT KUMARMechanical-21201298429

OVERVIEW Need of gearless transmission. What is gearless transmission? Working Applications Comparison Materials Specification and manufacturing of parts Advantages Limitations Possible advances Conclusion

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 using any gears .

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.

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

Constructional details

Part Dimensions

Cylinder 60mm(dia.)

Shaft 15mm(dia.)

Links 10mm(dia.), 170mm (length)

Bearings 15mm (inner dia.)

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

GearedGearless

Manufacturing methods- Costly. manufactured on special purpose

machines Complex calculations

No interchangeability

Manufacturing methods- Less costly.

No need of special machines

Less calculations

Freedom of interchangeability

Geared v/s gearless

transmission

Geared Gearless

Cause of failure- Pitting, corrosion, erosion and fatigue

have severe effect. Replacement of entire gear set needs to

be done.

Cause of failure- Pitting, corrosion, erosion and fatigue

effect less severely Replacement of defected pin only

Geared v/s gearless

transmission

Geared Gearless

Lubrication and cooling- Complex system Cooling is a big issue

Lubrication and cooling- Simple Easy to cool

Geared v/s gearless

transmission

Geared Gearless

Torque transmitting capacity- Used in high torque applications

Different speed at any angle is not easily possible

Torque transmitting capacity- Low torque applications

Different speed at any angle is easily done

• Preliminary shaping of machine components

Primary shaping

• Final shape of machine component on lathe

Machining process

• Polishing, lapping, filingSurface finishing

• Arc weldingJoining

• Lubrication, adjustmentSpecial Operations

Manufacturing of parts

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.