Gearless Power Transmission

1. GEARLESS POWER TRANSMISSION SYSTEM BY: Dolat Ram DEPARTMENT OF MECHANICAL ENGINEERING, JAMSHORO

2. OVERVIEW Need of gearless transmission? What is gearless transmission. Working principle Construction Details Applications Comparison Materials Specification and manufacturing of parts Advantages Limitations Possible advances/ Future aspects Conclusion

3. 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 can not be done using geared transmission. Gearless transmission mechanism is capable of transmitting power at any angle without any gears being manufactured.

4. 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 utilizing gears.

5. Working Principle Transmits the power between two shafts whose axes are at 90◦ degrees 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.

6. General Layout:

7. Construction Details:

8. Applications Tower clocks Gang drilling (multi spindle drilling) Lubrication pump for CNC lathe Angular drilling between 0-90 degrees Movement of periscope in submarines Used in vehicles (go-carts) Hand driven machines like juice makers, sheet machines etc. Small and medium load transmission Very useful in machine shop Industrial application

9. Geared v/s Gearless Transmission Geared Transmission Gearless Transmission 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

10. Geared v/s Gearless Transmission Geared Transmission Gearless Transmission Causes of failure: Pitting, corrosion, erosion and fatigue have severe effect. Replacement of entire gear set needs to be done. Causes of failure: Pitting, corrosion, erosion and fatigue effect less severely. Replacement of defected pin only.

11. Geared v/s Gearless Transmission Geared Transmission Gearless Transmission Lubrication and cooling: Complex system Cooling is big issue Lubrication and cooling: Simple Easy to cool

12. Geared v/s Gearless Transmission Geared Transmission Gearless Transmission Torque transmitting capacity: Used in high torque applications Different speed at any angle is not easily possible Torque transmitting capacity: Used in low torque applications Different speed at any angle is easily done

13. Manufacturing of parts

14. Advantages More efficient than gear. Complete freedom of interchangeability. 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. Used to reduce maintenance of cost Quick response is achieved. Easy to maintain and repair.

15. Advantages No fire hazard problem due to over loading. The speed of forward and reverse stroke is varied. Continuous operation is possible without stopping.

16. 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 Load carrying capacity of this unit is not very low.

17. Future Aspects Torque bearing capacity can be improved. Flexible bent links may be used. Has a bright future in automation and robotics. Can be used in automobile industry. Note: By attaching bushes with drum then the chances of vibration may reduce and also overall weight of the mechanism is also reduced(by using drum with less thickness). The proper operation of bent links may obtained.

18. 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 at the same time reduce the maintenance cost of the same machine. Further advancement in this technology can be made.