Abstract
The existing BRRI Hydro-tiller was tested at BRRI West byde to find out the causes of frequent tearing of the hydro-tiller chain. Its capacity was found 0.023 ha/hr. The reason associated with the fault of hydro-tiller chain tearing was identified i.e. thickness of the chain was not sufficient to bear the load, strength of the bearing of the rotary box was not sufficient to bear the load. To overcome the problem, the thickness of the sprocket was increased to 11mm. ASME #60 chain was used instead of ASME #50 chain. The width of the ASME #60 chain is 23 mm. In addition, two bearings were set in combination with the rotary box shaft instead of a single bearing to increase the strength of the Hydro-tiller in smooth operation at full load condition. The size of each bearing was 62 mm x 16 mm. The complete design of the modified hydro-tiller was done with the help of the Solid Works tool. After that, the modified hydro-tiller was tested at BRRI West byde, Gazipur. After modification, the capacity of the hydro-tiller was increased to 0.039 ha/hr. The average fuel consumption of the modified hydro-tiller was 2.01 l/hr. The number of chain and belt tearing of the hydro-tiller has decreased drastically to below 8 per year after the modification. No event of engine stopping due to overloading arose during land cultivation.
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