Ways to increase the traction efficiency of modular draft device

Abstract

The versatility of tractors can be increased by using them as a part of a modular draft device (MDD). MDD consists of energetic (EM) and technological (TM) modules. EM is a high-energy tractor with a 2WD or 4WD wheel arrangement and a traction force of 14-16 kN. TM is an additional axle with an active drive of its wheels. By connecting TM to the rear hitch linkage (RHL) of EM, the tractive effort of the entire MDD, which has a 4WD or 6WD wheel arrangement, increases to 32-36 kN. MDD can function as a road-rail vehicle. Depending on the traction resistance, MDD can be used both as part of an EM+TM or as a single EM. According to the research results, it was found that the maximum traction efficiency (TE) of MDD with a 6WD wheel arrangement is about 10% higher than that of MDD with a 4WD wheel arrangement. The TE value of MDD increases with an increase in the inclination of EM rear hitch linkage top link. The increase in MDD’s tractive efficiency is facilitated by an increase in the coefficient of kinematic discrepancy in the drive of the EM and TM wheels from 1.00 to 1.05.

Simulation of elastic-dissipative connection of multi-axle block-modular agricultural tractor modules

“…The prospects to increase the efficiency of the machine-and-tractor aggregates, to reduce their specific fuel consumption, etc. on the basis of the classical methods of use are to a great extent exhausted [3][4][5]. This problem can be solved by implementing the traction-energy concept of the development of the energy facilities on the basis of their block-modular structure [6;7].…”

Experimental investigations in vertical vibration damping of agricultural aggregate of block-modular type

“…A perspective direction in the development of tractor building, which means creation of traction-driven agricultural aggregates, has not yet been sufficiently studied. Of particular interest is the formation of such aggregates according to the block-modular principle, using technological modules with the driving wheels [5][6][7].…”

“…A positive by-effect of the technological module is vibration damping of the block-modular aggregate, created by inertia of its weight and the resistance force of the agricultural implement. Investigation of the smooth running of mobile power facilities, transport and machine-and-tractor aggregates, in order to improve their dynamic characteristics, are given in the works by many scientists [6][7][8][9][10][11][12]. In particular, they have proved that the vertical vibrations of agricultural aggregates lead to a change in the dynamic radius of the tractor wheels, and with it, its adhesion weight.…”

“…In particular, they have proved that the vertical vibrations of agricultural aggregates lead to a change in the dynamic radius of the tractor wheels, and with it, its adhesion weight. The angular speed of rotation of the engine shaft of tractors from the level of their vibration load decreases in this case by 10-25 s -1 [6]. The variable moment of resistance on the shaft of the tractor engine, due to the nonlinearity of its speed characteristics, leads to incomplete use of power and a decrease in the energy costs by 6-18 kW [4][5][6].…”

“…The variable moment of resistance on the shaft of the tractor engine, due to the nonlinearity of its speed characteristics, leads to incomplete use of power and a decrease in the energy costs by 6-18 kW [4][5][6]. But a decrease in the forward speed of the movement of agricultural aggregates decreases by 0.4 m•s -1 , which ultimately reduces the productivity of the work [6].…”