Implementation Tractors Agricultural machinery Excavating machines Cars, trucks and buses Military machines Load-lifting machines Process equipment drives Motor-variators Power equipment Mining equipment Road-building machines
Working principle of a mechanical power variator Detail 1Main principle:Point A fixing of the shaft Detail 2(a detail 2) in the necessarytime in a proper place withmoving possibility of е Nother points. Points O and M Mare a spinning ax of the Oinput (a detail 3) and the output(a detail 2) shafts accordingly.Distance О-М (further “е”) is Detail 3The eccentricity of a variatorand also can change over Аthe range from 0 to еmax dueto the mutual crank twirls(a detail 1) and the input shaft (a detail 3)Transfer relationship of a variator I = (R+e)/e, where R – radius (distance M-N) output shaft pitchline (a detail 2). Change of a transfer relationship i occurs at the expense of eccentricity changeе. At е=0 the variator output shaft is not twirled at any turns of the input shaft.The offered principle provides unaccented fixing of a point A and an output shaft uniformrotation.
Mechanical power variator’ working principle demonstration
Transmissions’ characteristics The characteristic of transmission with frictional variators Works effectively over the range speeds from Vmin to Vmax. Relation Vmax / Vmin = 3–6. EFFICIENCY more low, than in a mechanical step transmission.Moment The characteristic of transmission with МPV Works effectively in a wide speed range. Vmax / Vmin is more than 1000. Works effectively in a repent regime. EFFICIENCY is commensurable with EFFICIENCY of a manual transmission. The characteristic of mechanical transmission Works with the greatest efficiency only in separate points. The characteristic of ideal transmission Turns
Areas of technical maintenance W kWUltrahigh more than 500 High 100-500 Medium 10-100 Low 1-10Ultralow less than 1 Ultralow Low Medium High Ultrahigh less than 10 10-200 200-3000 3000-10000 more than10000 N turns/min Drive type MPV Hydraulic Wedge-belt Multidisc
Operational and technical advantages Possibility of installation with engines of various power, including morethan 500 kW. Effective work in a wide control range of speeds, Vmax / Vmin is more1000. Transferred twisting moment up to 100 кN*м. High efficiency (92–95 %). Possibility to work without the clutch. Possibility of stable and long work on small target turns and themaximum loadings (a repent regime). Weight and size characteristics are in 1,5–2 times less than at comparablemultistage gear reductors. High durability of work due to the minimum contact loadings (σk≤ 15 kg/m2) on transferring elements of MPV. Simple manufacturing methods.
Comparison МPV with other types of variators Drive type Wedge- MPV Hydraulic Multidisc beltParameterEfficiency, % 92-95 75-87 85-89 84-88Kinematic range, Vmax / Vmin 1000 3 6 5 and moreComparative metal consumption, % 70 100 95 93 Expected fuel economy at using МPV in comparison with other types of variators: in a usual regime, % 5–8 in a repent regime, % 30 – 40
Technical data of a class 1.4 tractors automatic transmission controlled by МPVThe maximum transferred power HP/кW 136/100Nominal rotational speed of the input shaft, min-1 1700Max rotational speed of the input shaft, min-1 less 2200Rotational speed of the output shaft, min-1 more 2200Min rotational speed of the output shaft, min-1 0The maximum moment on the input shaft, Nм 600The maximum moment on the output shaft, Nм 1700Variator’s efficiency 0,94 – 0,96Regulating of turns on the output shaft no-step, without rupture of a power streamVariator’s control system drive automatic (possible transfer to manual regime)Size, mm, less than length 565 width 480 height 390Weight, kg 155
Sample of experimental design of MPV Tractor variator
Patent protection of МPV Ukraine Russia Belorussia ChinaStand tests of MPV with automatic control Machines and systems institute(IMIS) г. Kharkov, Ukraine
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