Axial Piston Variable Pump A7VO - Group VH A/S

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Blocked for new applications / Für Neuanwendung gesperrt6/32 Bosch Rexroth AG A7VO RE 92 202/03.06Technical DataPermissible radial and axial loading on the drive shaftThe values given are maximum values and do not apply to continuous operation.Size 28 55 80 107 160Radial force, max.F q Fq max N 5696 9280 11657 13580 18062at distance afrom shaft collar aa mm 12,5 15 17,5 20 22,5Radial force/bar operating pressure 1 ) F q /bar N/bar 14,2 23,2 29,1 34 45,2Axial force, max. 2 )-+F ax max N 315 500 710 900 1120F ax+–F ax max N 315 500 710 900 1120Perm. axial force/bar operating pressure ±F ax zul. /bar N/bar 4,6 7,5 9,6 11,3 15,11) at gear drive (DIN 867) with smallest PCD of pinion D R min and V g max (D R min = 2,5 x diameter of drive shaft).Preload required/bar operating pressure (radial force) to transmit torque at V-belt drive (DIN 7753) with smallest pulley diameterD K min und V g max (D K min = 5 x diameter of drive shaft).2) max. permissible axial force when stopped or when axial piston unit working in pressureless conditionsWhen considering the permissible axial force, the force-transfer direction must be taken into account:– F ax max = increase in service life of bearings+ F ax max = reduction in service life of bearings (avoid if at all possible)Effect of radial force F q on the service life of the bearingsBy selecting a suitable force-transfer direction of F q , the stress on the bearing caused by the internal transmission forces can bereduced, thus achieving the optimum service life for the bearing. Recommended position of mating gear depending on direction ofrotation. Examples:Gear driveV-belt driveϕ opt = 45°ϕ opt = 45°ϕ opt = 70°ϕ opt = 70°Clockwisedirection of rotationPressure on port BCounter-clockwisedirection of rotationPressure on port AClockwisedirection of rotationPressure on port B
Blocked for new applications / Für Neuanwendung gesperrtRE 92 202/03.06 A7VO Bosch Rexroth AG 7/32LR Power ControlThe power control regulates the displacement of the pump dependingon the operating pressure so that a given drive poweris not exceeded at constant drive speed.p B • V g = constantp B = operating pressure; V g = displacementThe precise control with a hyperbolic control characteristic,provides an optimum utilization of available power.The operating pressure acts on a rocker via a piston. An externallyadjustable spring force counteracts this, it determines thepower setting.If the operating pressure exceeds the set spring force, thecontrol valve is actuated by the rocker, the pump swivels back(direction V g min ). The lever length at the rocker is shortenedand the operating pressure can increase at the same rate asthe displacement decreases without the drive powers beingexceeded (p B • V g = constant).In zero pressure non-running condition, the pump is swivelledto its starting position (V g max ) by means of the control spring.Setting range for start of control ______________50 – 220 barThe output power (characteristic) is influenced by the efficiencyof the pump.State in clear text in the order:– drive power P in kW– drive speed n in rpm– max. flow q V max in l/minAfter clarifying the details a power diagram can be created byour computer.Characteristic LROperating pressure pB in bar220 barSetting rangeStart of control50 barV g min Displacement V g maxCircuit diagram LRU RV g min V g maxB (A)A1X3T1S
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Axial Piston Variable Pump A7VO - Group VH A/S

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