Abstract
The aim of this research was to conduct the comparative traction tests for T-170M1.03-55 tractor with a flat and elliptical rim. Structurally rational geometry of the crawler's support surface for tractors with semi-rigid suspension is realized by placing the support rollers at different heights relative to the cart. The results of traction tests showed that elliptical track rim has increased the maximum traction power by 10.4%, conditional traction propulsive efficiency coefficient to 7.43% and the specific traction effort by 8%. The increase in indicators is provided by a lower rolling resistance of a tractor with an elliptical rim. Reduction of the resistance power to rolling of the tractor with an ellipse track rim occurs due to alignment of support rollers vertical load and reduction of resistance to rollers movement on internal contours of tracks and in hinges of track chain links. The results of the research indicate a significant improvement in traction performance of T-170M1.03.55 tractors with elliptical track-chain rim.
Highlights
When performing technological operations in agriculture, a track-chain tractor is an effective pulling device [1]
All-Union Standard 18509; CPRI - the engine power coefficient according to the State All-Union Standard 18509, corresponding to atmospheric conditions and fuel parameters during traction tests on a specific (i-th) gear
To evaluate influence of the mover support part geometry on traction characteristics of the T-170M1.03-55 tractor, several indicators of traction characteristics were used. Those indicators are: the maximum traction power, Nhkmax [kW]; conditional traction efficiency coefficient [ h cond]; traction effort corresponding to the maximum traction power, P [kN], engine speed at maximum traction hk power, ne [min-1]; the specific fuel consumption at maximum traction power, ghk [kg.kW-1.h-1]; operating speeds, Va [km/h]; coefficient of resistance to the movement, f; sliding coefficient [d]
Summary
When performing technological operations in agriculture, a track-chain tractor is an effective pulling device [1]. Track-chain tractors in comparison to wheeled tractors have better traction, better off-road capabilities, low soil compaction indicators, 8-20% lower fuel consumption per unit of work performed [2,3,4]. A chain-track tractor has a number of disadvantages that worsen its performance [5]. Much attention is paid to improving the technical level of tractors and track assembly traction indicators, as well as to the reduction of metal content and soil compaction [4,5,6]. One of the ways to increase traction and reduce soil compaction is the tractor movers’ improvement [7]. More than twelve mover designs are used. Rubber-reinforced tracks have both, advantages and disadvantages compared to metal track-chain movers [8,9,10,11]
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