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The choice of gearbox parameters of a tractor with hydromechanical transmission
102
ABSTRACTS driving wheels, power losses due to slip, the over-running effect in the transmission of power from tractor to trailer and the draught characteristics of the unit as a whole. Calculations are made for a given tractor and 2.5 ton trailer. The maximum load capacity of the trailer, the c.g. of the trailer without load and the optimum position of the load body, tyre size and transmission ratio and other design parameters are determined theoretically. [N.I.A.E.]
139.
N. Velev. The Choice of Gearbox Parameters of a Tractor with Hydromechanical Transmission. Trakt. Selkhozmash.. 1965,35 (3) 3-6; bibl. 6, illus. (R.) A theoretical study which concludes that the optimum number of main gears in a combined hydraulic torque converter and mechanical gearbox is 2. Equations are derived to determine the ratios of these gears. [N.I.A.E.]
140.
I. N. VeUcbkh. Ways of Increasing the Reliability and Life of Tractor Engines. Tmkr. Sefkhozmash.. 1964,34 (5) 3-6; illus. (R.) Proposed improvements to cylinders. piston rings, air and oil filters and accuracy of manufacture to prolong the life of engines to 35OO-4OOOh. [N.I.A.E.]
141.
A. A. Vysotdsii. New Integrating Instruments for Determining Physical and Mechanical Properties of Soil. Trakt. Selkhozmush., 1965,35 (1) 28-30; illus. (R.) The instruments for measuring soil strength and friction employ a simple mechanical integrator with frictional variable ratio drive (disc driving a roller at right angles to it) the speed varying with the deformation of the spring when the probe, etc., is inserted into the soil. The 920mm high hand-driven penetrometer has 9 changeable scales, a 1 crna probe. changeable springs (25, 50 and 120 kg) and a penetration of 100, 200 and 300 mm. The friction meter consists essentially of a disc with an annular friction surface, to which a normal load is applied, rotated (by handle) about a vertical axis and producing ground pressures of 0.1 and 0.2 kg/cm2 using 1 or 2 weights and a change of springs [N.I.A.E.]
142.
A. A. Vysotskii and G. T. Kkhman. Instrument for the Processing of Graphs by the Peak Method. Trakr. Selkhozmush.. 1964.34 (5) 34-35: illus. (R.) The instrument, with a 220 V supply, has a pointer guided by hand which traces the minimum and maximum peaks of an oscillograph, and registers them in 8 categories each by pulse counters actuated by capacitors when the direction of the point changes. The chart is unwound off a drum by an electric motor at 06-1.8 mm/s. [N.I.A.E.]
143.
W. Wiibicki. Soil pressure in the Light of Experimental Investigations (in Polish). Proc. Vibration Problems (Polska Akad. Nauk. Inst. Podstawowych Problemow Tech,) 12,1,115-120,1964. The problem is that of applying the results of model tests of soil pressure carried out at the IPPT (Institute of Basic Technical Problems), Polish Academy of Sciences, to the computation of real walls. The diagrams of unit pressure z obtained by experiment at the depth x below the embankment are replaced with sinusoids where the parameters zm are equal to the unit pressure at the bottom of the wall. The diagram of the parameters zm obtained from the experiments has been smoothed by the method of least squares, a straight line being obtained. Although the increases Au of the direction coefficients of the lines connecting the values of the parameters Z~ at various levels tend to decrease with increasing wall height, the value of Aa is assumed in the computation to be constant for safety reasons. Under such conditions the expression of the sum of terms of the arithmetic progression of which the difference is Aa, leads us to an equation for zm, for a wall of any height and an expresson for total pressure. Some computation examples are given. [Applied Mechanics Review.]
144.
S. T. Willatt and A. H. Willis. A Study of the Trough Formed by the Passage of Tines through Soil. Journal of Agric. Engng. Research. Vol. 10, No. 1, March 1965. With the aid of a profilometer, the shape of the troughs formed by the passage of tines through soil was examined. When single tines are used. either vertical or curved, the undisturbed soil face is roughly trapezoidal in shape. The width of the trough at the surface increases linearly with depth and the cross-sectional area varies as the square of the depth. In dimensionless terms the equations are 7=li, + w/d and
ABSTRACTS driving wheels, power losses due to slip, the over-running effect in the transmission of power from tractor to trailer and the draught characteristics of the unit as a whole. Calculations are made for a given tractor and 2.5 ton trailer. The maximum load capacity of the trailer, the c.g. of the trailer without load and the optimum position of the load body, tyre size and transmission ratio and other design parameters are determined theoretically. [N.I.A.E.]
139.
N. Velev. The Choice of Gearbox Parameters of a Tractor with Hydromechanical Transmission. Trakt. Selkhozmash.. 1965,35 (3) 3-6; bibl. 6, illus. (R.) A theoretical study which concludes that the optimum number of main gears in a combined hydraulic torque converter and mechanical gearbox is 2. Equations are derived to determine the ratios of these gears. [N.I.A.E.]
140.
I. N. VeUcbkh. Ways of Increasing the Reliability and Life of Tractor Engines. Tmkr. Sefkhozmash.. 1964,34 (5) 3-6; illus. (R.) Proposed improvements to cylinders. piston rings, air and oil filters and accuracy of manufacture to prolong the life of engines to 35OO-4OOOh. [N.I.A.E.]
141.
A. A. Vysotdsii. New Integrating Instruments for Determining Physical and Mechanical Properties of Soil. Trakt. Selkhozmush., 1965,35 (1) 28-30; illus. (R.) The instruments for measuring soil strength and friction employ a simple mechanical integrator with frictional variable ratio drive (disc driving a roller at right angles to it) the speed varying with the deformation of the spring when the probe, etc., is inserted into the soil. The 920mm high hand-driven penetrometer has 9 changeable scales, a 1 crna probe. changeable springs (25, 50 and 120 kg) and a penetration of 100, 200 and 300 mm. The friction meter consists essentially of a disc with an annular friction surface, to which a normal load is applied, rotated (by handle) about a vertical axis and producing ground pressures of 0.1 and 0.2 kg/cm2 using 1 or 2 weights and a change of springs [N.I.A.E.]
142.
A. A. Vysotskii and G. T. Kkhman. Instrument for the Processing of Graphs by the Peak Method. Trakr. Selkhozmush.. 1964.34 (5) 34-35: illus. (R.) The instrument, with a 220 V supply, has a pointer guided by hand which traces the minimum and maximum peaks of an oscillograph, and registers them in 8 categories each by pulse counters actuated by capacitors when the direction of the point changes. The chart is unwound off a drum by an electric motor at 06-1.8 mm/s. [N.I.A.E.]
143.
W. Wiibicki. Soil pressure in the Light of Experimental Investigations (in Polish). Proc. Vibration Problems (Polska Akad. Nauk. Inst. Podstawowych Problemow Tech,) 12,1,115-120,1964. The problem is that of applying the results of model tests of soil pressure carried out at the IPPT (Institute of Basic Technical Problems), Polish Academy of Sciences, to the computation of real walls. The diagrams of unit pressure z obtained by experiment at the depth x below the embankment are replaced with sinusoids where the parameters zm are equal to the unit pressure at the bottom of the wall. The diagram of the parameters zm obtained from the experiments has been smoothed by the method of least squares, a straight line being obtained. Although the increases Au of the direction coefficients of the lines connecting the values of the parameters Z~ at various levels tend to decrease with increasing wall height, the value of Aa is assumed in the computation to be constant for safety reasons. Under such conditions the expression of the sum of terms of the arithmetic progression of which the difference is Aa, leads us to an equation for zm, for a wall of any height and an expresson for total pressure. Some computation examples are given. [Applied Mechanics Review.]
144.
S. T. Willatt and A. H. Willis. A Study of the Trough Formed by the Passage of Tines through Soil. Journal of Agric. Engng. Research. Vol. 10, No. 1, March 1965. With the aid of a profilometer, the shape of the troughs formed by the passage of tines through soil was examined. When single tines are used. either vertical or curved, the undisturbed soil face is roughly trapezoidal in shape. The width of the trough at the surface increases linearly with depth and the cross-sectional area varies as the square of the depth. In dimensionless terms the equations are 7=li, + w/d and