Axial Piston Variable Pump A7VO Series 63 - Hydraulica-ua
Axial piston variable pump A7VO Series 63 RE 92202 Edition: 02.2015 Replaces: 05.2012 Sizes 28 to 160 Nominal pressure 350 bar Maximum pressure 400 bar Open circuit Characteristics Contents Variable pump with axial tapered piston rotary group of Ordering code 2 Hydraulic fluids 4 For use in mobile and stationary applications Shaft seal ring 5 Flow is proportional to the drive speed and displace- Flow direction 5 Operating pressure range 6 Technical data 7 LR – Power controller without power override 9 bent-axis design, for hydrostatic drives in open circuit ment. The flow can be steplessly changed by adjusting the bent axis. Wide selection of control devices Compact, robust pump with a long service life LA1 – Power controller with hydraulically proportional power override 13 DR – Pressure controller 15 HD – Proportional hydraulic control 18 EP – Proportional electric control 20 Dimensions, size 28 21 Dimensions, size 55 24 Dimensions, size 80 28 Dimensions, size 107 32 Dimensions, size 160 36 Connector for solenoids 40 Installation instructions 41 Project planning notes 42 Safety instructions 42 RE 92202/02.2015, Bosch Rexroth AG
A7VO Series 63 Axial piston variable pump Ordering code 2 Ordering code 01 02 A7V O 03 04 05 / 06 63 07 – 08 V 09 10 B 01 11 12 13 Axial piston unit 01 A7V Bent-axis design, variable, nominal pressure 350 bar, maximum pressure 400 bar Operating mode 02 O Pump, open circuit Size (NG) 03 Geometric displacement Vg (cm3), see “Technical data” on page 7 28 55 80 107 160 28 55 80 107 160 For sizes 250, 355 and 500, see data sheet 92203 Control device 04 Power controller without power override LR LRD with stroke limiter negative control Δp 25 bar – LRH1 with pressure cut-off and stroke limiter negative control Δp 25 bar – LRDH1 – LRDS – – – LA1S with pressure cut-off with pressure cut-off and load sensing Power controller with hydraulically proportional power override (only available for clockwise rotation and with port plate 02) with load sensing – – – LA1S5 DR remotely controlled DRG with load sensing – DRS Δp 10 bar HD1 Positive control Δp 10 bar HD1G Positive control U 24 V EP2 with load sensing and hydraulically proportional LS-override Pressure controller Proportional control hydraulic Positive control with pressure cut-off, remotely controlled Proportional control electrical Series 05 63 Series 6, index 3 Direction of rotation 06 28 to 160 Viewed on drive shaft clockwise R counter-clockwise L Sealing material 07 V FKM (fluoroelastomer) Drive shaft 08 28 to 160 Splined shaft DIN 5480 Z Parallel keyed shaft according to DIN 6885 P Mounting flange 09 B ISO 3019-2; 4-hole Port plate for working lines 10 SAE flange ports A and S at rear (metric fastening thread) 01 SAE flange ports A and S at side (available for power controllers LA1S and LA1S5 only, metric fastening thread) 02 Available – Not available Bosch Rexroth AG, RE 92202/02.2015 Preferred program
Axial piston variable pump A7VO Series 63 3 Ordering code 01 02 A7V O 03 04 05 / 06 63 07 – V 08 09 10 B 01 11 12 13 Connector for solenoids1) (see page 40) 11 Without connector (without solenoid, with hydraulic control only; without code) DEUTSCH molded connector, 2-pin – without suppressor diode P Standard / special version 12 Standard version (without code) -S Special version Available – Not available Preferred program Notes Note the project planning notes on page 42! Preservation: –– Up to 12 months as standard –– Up to 24 months long-term (state in plain text when ordering) 1) Connectors for other electric components may differ RE 92202/02.2015, Bosch Rexroth AG
4 A7VO Series 63 Axial piston variable pump Hydraulic fluids Hydraulic fluids The A7VO variable pump is designed for operation with HLP Details regarding the selection of hydraulic fluid mineral oil according to DIN 51524. The hydraulic fluid should be selected such that the Application instructions and requirements for hydraulic operating viscosity in the operating temperature range is fluids should be taken from the following data sheets within the optimum range (νopt, see selection diagram). before the start of project planning: Note 90220: Hydraulic fluids based on mineral oils and At no point of the component may the temperature be related hydrocarbons 90221: Environmentally acceptable hydraulic fluids higher than 115 C. The temperature difference specified in 90222: Fire-resistant, water-free hydraulic fluids the table is to be taken into account when determining the viscosity in the bearing. (HFDR/HFDU) If it is not possible to maintain the conditions above due to 90223: Fire-resistant, water-containing hydraulic fluids extreme operating parameters, we recommend flushing the (HFC, HFB, HFAE, HFAS) case at port U. Viscosity and temperature of hydraulic fluids Viscosity Cold start νmax 1600 mm /s 2 Permissible temperature difference Warm-up phase ν 1600 to 400 mm /s 2 Temperature Comment θSt -40 C t 3 min, n 1000 rpm, without load p 50 bar ΔT 25 K between axial piston unit and hydraulic fluid in the system θ -40 C to -25 C at p 0.7 pnom, n 0.5 nnom and t 15 min This corresponds, for example on the VG 46, to a temperature range of 5 C to 85 C (see selection diagram) Continuous operation ν 400 to 10 mm2/s θ -25 C to 103 C Short-term operation measured at port R1/R2 Note the permissible temperature range of the shaft seal (ΔT approx. 12 K between the bearing/shaft seal and port R1/R2) νopt 36 to 16 mm2/s Range of optimum operating viscosity and efficiency νmin 7 mm /s t 3 min, p 0.3 pnom 2 Selection diagram Warm-up phase 1600 1000 600 400 Viscosity v [mm2/s] 100 60 40 36 20 16 10 Minimum permissible viscosity for short-term operation 7 -40 Minimum permissible temperature for cold start Bosch Rexroth AG, RE 92202/02.2015 0 10 VG 68 VG 46 VG 32 VG 2 2 200 VG Range of optimum operating viscosity vopt Optimum efficiency Continuous operation Maximum permissible viscosity for cold start -25 -10 0 10 30 50 70 Temperature θ [ C] 90 115
Axial piston variable pump A7VO Series 63 5 Shaft seal ring Filtration of the hydraulic fluid Finer filtration improves the cleanliness level of the hydraulic fluid, which in turn increases the service life of the axial piston unit. Shaft seal ring Permissible pressure loading The service life of the shaft seal is influenced by the speed A cleanliness level of at least 20/18/15 is to be maintained of the axial piston unit and the leakage pressure in the according to ISO 4406. housing (case pressure). Momentary pressure spikes At very high hydraulic fluid temperatures (90 C to maxi- (t 0.1 s) up to 10 bar are allowed. The service life of the mum 103 C, measured at port R1/R2) a cleanliness level is necessary of at least 19/17/14 according to ISO 4406. Leakage shaft seal decreases with increasing frequency of pressure spikes and increasing mean differential pressure. The case pressure must be equal to or higher than the ambient pressure. The case interior is connected to the suction chamber. A separate case drain line from the case to the reservoir is Exception: For versions with pressure controller or pressure cut-off, a drain line is needed to relieve port T1 to the reservoir. 5 Differential pressure p [bar] therefore not required (both R ports are plugged). NG28 4 NG55 3 NG107 NG80 2 NG160 1 0 0 2000 4000 Rotational speed n [rpm] 6000 The FKM shaft seal ring may be used for leakage temperatures from -25 C to 115 C. For application cases below -25 C, an NBR shaft seal is required (permissible temperature range: -40 C to 90 C). Flow direction Direction of rotation, viewed on drive shaft clockwise counter-clockwise S to B S to A RE 92202/02.2015, Bosch Rexroth AG
6 A7VO Series 63 Axial piston variable pump Operating pressure range Operating pressure range Pressure at working port A or B (high-pressure side) Definition Nominal pressure pnom 350 bar absolute The nominal pressure corresponds to the maximum design pressure. Maximum pressure pmax 400 bar absolute The maximum pressure corresponds the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period. Single operating period 10 s Total operating period 300 h Minimum pressure (high-pressure side) 10 bar absolute Minimum pressure on high-pressure side (A or B) required to prevent damage to the axial piston unit. Rate of pressure change RA max 16000 bar/s Maximum permissible rate of pressure build-up and reduction during a pressure change over the entire pressure range. Minimum pressure pS min 0.8 bar absolute Maximum pressure pS max 2 bar absolute Minimum pressure at suction port S (inlet) that is required to avoid damage to the axial piston unit. The minimum required pressure is dependent on the speed and displacement of the axial piston unit (see diagram on page 7). Pressure at suction port S (Inlet) Rate of pressure change RA max Pressure definition pnom Single operating period t2 tn Maximum pressure pmax Nominal pressure pnom Pressure p Pressure p t t1 p Time t Minimum pressure (high pressure side) Time t Total operating period t1 t2 . tn Note Operating pressure range valid when using hydraulic fluids based on mineral oils. Values for other hydraulic fluids, please contact us. Bosch Rexroth AG, RE 92202/02.2015
Axial piston variable pump A7VO Series 63 7 Technical data Technical data Size NG 28 55 80 107 160 Displacement, geometric, per revolution Vg max cm 28.1 54.8 80 107 160 Maximum rotational speed1) nnom rpm 3150 2500 2240 2150 1900 nmax1 rpm 4250 3400 3000 2900 2560 nmax2 rpm 4750 3750 3350 3200 2850 qv l/min 89 137 179 230 304 At Vg max, nnom and Δp 350 bar P kW 52 80 105 134 177 Torque At Vg max and Δp 350 bar T Nm 156 305 446 596 891 Rotary stiffness Vg max to Vg /2 cmin kNm/rad 5 10 16 21 36 cmax kNm/rad 16 32 49 67 104 JGR kgm² 0.0042 0.0080 0.0127 0.0253 At Vg max At Vg 0.74 Vg max Maximum rotational speed2) Flow At Vg max and nnom Power Vg /2 to 0 (interpolated) Moment of inertia rotary group 3 0.0042 Maximum angular acceleration α rad/s² 35900 31600 24200 19200 15300 Case volume V l 0.5 0.75 1.2 1.5 2.4 Weight (approx.) m kg 17 25 40 49 71 Maximum permissible speed (limit speed) Determining operating characteristics 1.5 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 Speed n / nnom 1.4 1.3 1.2 1.1 1.0 0.9 0.9 0.8 0.6 Inlet pressure pabs 2.3 0.8 0.7 0.8 0.9 1.0 Displacement Vg / Vg max Flow qv Torque T Power P Vg n ηv [l/min] 1000 Vg Δp [Nm] 20 π ηmh 2π T n 60000 qv Δp 600 ηt [kW] Key Vg Displacement per revolution [cm3] Δp Differential pressure [bar] n Rotational speed [rpm] ηv Volumetric efficiency ηmh Mechanical-hydraulic efficiency ηt Total efficiency (ηt ηv ηmh) Notes Theoretical values, without efficiency and tolerances; values rounded Operation above the maximum values or below the minimum values may result in a loss of function, a reduced service life or in the destruction of the axial piston unit. Other permissible limit values, such as speed variation, reduced angular acceleration as a function of the frequency and the permissible angular acceleration at start (lower than the maximum angular acceleration) can be found in data sheet 90261. 1) 2) The values are valid: ‒ At absolute pressure pabs 1 bar at suction port S ‒ For the optimal viscosity range of νopt 36 to 16 mm2/s ‒ For hydraulic fluid based on mineral oils. Maximum rotational speed (speed limit) for increased inlet pressure pabs at suction port S and Vg Vg max, see diagram. RE 92202/02.2015, Bosch Rexroth AG
A7VO Series 63 Axial piston variable pump Technical data 8 Permissible radial and axial forces of the drive shaft Size NG Drive shaft Ø Maximum radial force1) at distance a (from shaft collar) mm 55 80 107 160 25 30 35 40 45 18278 Fq Fq max N 6436 7581 10266 13758 a a mm 14.0 17.5 20.0 22.5 25.0 Maximum torque at Fq max Tq max Nm 179 281 444 681 1019 Maximum differential pressure at Vg max and Fq max Δpq max bar 400 322 349 400 400 Fax max N 0 0 0 0 0 Fax max N 315 500 710 900 11250 Fax perm/bar N/bar 4.6 7.5 9.6 11.3 15.1 Maximum axial force at standstill or pressurefree operation Fax – Permissible axial force per bar operating pressure Effect of radialforce Fq on the service life of bearings By selecting a suitable direction of radial force Fq, the load on the bearings, caused by the internal rotary group forces can be reduced, thus optimizing the service life of the bearings. Recommended position of mating gear is dependent on direction of rotation. Example: Gear drive t φ op 45 φopt 4 5 1 1 “Clockwise” rotation, pressure at port B 2 “Counter-clockwise” rotation, pressure at port A 1) 28 With intermittent operation Bosch Rexroth AG, RE 92202/02.2015 2 Note The permissible axial force in direction Fax is to be avoided, because thereby the bearing life is reduced. Special requirements apply in the case of belt drives. Please contact us.
Axial piston variable pump A7VO Series 63 9 LR – Power controller without power override LR – Power controller without power override pump depending on the operating pressure so that a given drive power is not exceeded at constant drive speed. The precise control with a hyperbolic control characteristic, provides an optimum utilization of available power. The operating pressure acts on a rocker via a measuring spool which moves with the control. An externally adjustable spring force counteracts this, it determines the power setting. If the operating pressure exceeds the set spring force, the control valve is actuated by the rocker and the pump swivels back from the initial position Vg max toward Vg min. When doing this, the lever length at the rocker shortens and the Characteristic curve LR Operating pressure pB [bar] The power controller regulates the displacement of the 220 bar 50 bar Vg min displacement Vg max Schematic LR operating pressure may rise in the same proportion as the displacement reduces without the drive power being exceeded (pB Vg constant; pB operating pressure; Vg displacement). When depressurized, the pump is swiveled to its initial U R1 position to Vg max by a return spring. B(A) The hydraulic output power (characteristic LR) is influ- A1 enced by the efficiency of the pump. Beginning of control, setting range 50 to 220 bar When ordering, state in plain text: Drive power P [kW] Drive speed n [rpm] Vg min Maximum flow qv max [l/min] Vg max X3 Please contact us if you need a power diagram. T1 S R2 M1 RE 92202/02.2015, Bosch Rexroth AG
A7VO Series 63 Axial piston variable pump LR – Power controller without power override 10 LRD – Power controller with pressure cut-off Characteristic curve LRD The pressure cut-off is a pressure control which adjusts the displacement of the pump back to Vg min after reaching the This function overrides the power controller, i.e. the power control function is executed below the pressure command value. Pressure cut-off is preset to a pressure command value at the factory. Setting range 200 to 350 bar When ordering, state the setting in plain text. Operating pressure pB [bar] set pressure command value. 350 200 max min Notes The pressure setting of the pressure cut-off must be at displacement Vg min Vg max least a factor of 5 higher than the beginning of control of power control. Example: Schematic LRD –– Beginning of control of the power controller: 50 bar –– Minimum setting of pressure cut-off: 5 50 250 bar Higher settings of the pressure cut-off are always possible. U R1 B(A) For versions with pressure cut-off, a drain line is needed from port T1 to the reservoir. A1 When port T1 is plugged and ttank 50 C, this results in a permissible pressure cut-off of 2 min. Any pressure-relief valve included in the system to limit the maximum pressure must have its start of opening at least 20 bar above the pressure cut-off setting. Vg min Vg max X3 T1 S R2 Bosch Rexroth AG, RE 92202/02.2015 M1
Axial piston variable pump A7VO Series 63 11 LR – Power controller without power override LR – Power controller with stroke limiter Schematic LRH1 Due to the hydraulic stroke limiter, it is possible to change X1 or limit the displacement of the pump continuously across the entire control range. The displacement is set proportionally using the pilot pressure pSt applied to port X1 (maximum of 40 bar). The power control overrides the hydraulic stroke limiter, i.e. U Y3 R1 below the power characteristic (hyperbolic characteristic), B(A) the displacement is controlled in dependence on the pilot A1 pressure. If the set flow or operating pressure exceeds the power control characteristic, the power control overrides and reduces the displacement along the hyperbolic characteristic. A control pressure of 40 bar is needed to swivel the pump Vg min from its initial position Vg max to Vg min. Vg max The necessary control power is taken from the operating X3 pressure or the external control pressure applied to port Y3. To ensure that the stroke limiter functions at a low operat- T1 ing pressure of 40 bar, port Y3 must be supplied with an S external control pressure of about 40 bar. R2 M1 LRH1 – Hydraulic stroke limiter (negative control) Control from Vg max to Vg min As the pilot pressure increases, the pump swivels to a Schematic LRDH1 smaller displacement. X1 Start of control (at Vg max) can be set to 4 to 15 bar When ordering, state the start of control in plain text. Initial position without pilot signal (pilot pressure): Vg max Characteristic curve LRH1 control pressure increase (Vg max – Vg min) Δp 25 bar U Y3 R1 B(A) A1 40 Pilot pressure pSt [bar] 35 30 25 20 Vg min 15 Vg max 10 5 4 T1 0 0.2 0.4 0.6 Displacement Vg/Vg max X3 0.8 1.0 S R2 M1 RE 92202/02.2015, Bosch Rexroth AG
12 A7VO Series 63 Axial piston variable pump LR – Power controller without power override LRDS – Power control with pressure cut-off and load Characteristic curve LRDS sensing The load sensing controller works as a load-pressure conpump to the volume required by the consumer. The flow of the pump is then dependent on the cross section of the external measuring orifice (1), which is located between the pump and the consumer. Below the power curve and the setting of the pressure cut-off and within the control range of the pump, the flow is independent of the load pressure. The measuring orifice is usually a separately located load Operating pressure pB [bar] trolled flow controller and adjusts the displacement of the 350 200 max min sensing directional valve (control block). The position of the directional valve spool determines the opening cross- displacement Vg min section of the measuring orifice and thus the flow of the Vg max pump. The load sensing controller compares pressure before and after the orifice and keeps the pressure drop (differential Schematic LRDS pressure Δp) across the orifice – and therefore the flow – constant. If the differential pressure p at the measuring orifice rises, the pump is swiveled back (toward Vg min). If the differential U X4 R1 pressure Δp drops, the pump is swiveled out (toward B(A) Vg max) until equilibrium at the measuring orifice is restored. A1 Δpmeasuring orifice ppump – pconsumer 1 Setting range for Δp 14 to 25 bar Default setting 18 bar When ordering, state the setting in plain text. Vg min Vg max The stand-by pressure in zero-stroke mode (metering orifice closed) is slightly higher than the Δp setting. X3 T1 In an LUDV system, the pressure cut-off is integrated in the flow sharing control block (LUDV). S R2 M1 The measuring orifice (control block) (1) is not included in the scope of delivery. Bosch Rexroth AG, RE 92202/02.2015
Axial piston variable pump A7VO Series 63 13 LA1 – Power controller with hydraulically proportional power override LA1 – Power controller with hydraulically proportional power override The power controller regulates the displacement of the LA1S – Power controller with load sensing pump depending on the operating pressure so that a given For description of load sensing, see page 12. drive power is not exceeded at constant drive speed. The hyperbolic power curve is approximated with two Characteristic curve LA1S measuring springs. The operating pressure acts on the measurement area of a differential piston against the measuring determines the power setting. If the sum of the hydraulic forces exceeds the forces of the springs, the control oil is fed to the stroking piston, which swivels the pump back to reduce the flow. In a depressurized state, the pump is swiveled to its initial position to Vg max by a return spring. By connecting an external pilot pressure at port X3, it is Operating pressure pB [bar] springs and an externally adjustable spring force which 350 200 max min possible to override the power control proportionally. Increasing pilot pressure reduced power. displacement Vg min Characteristic curve LA1 Vg max Schematic LA1S 350 300 Setting range Beginning of control Operating pressure pA [bar] 400 250 200 150 100 50 0 0 Vg min 0.2 0.4 0.6 0.8 displacement X4 U X3 R1 A 1.0 Vg max Vg min The hydraulic output power (characteristic curve) is Vg max affected by the efficiency. When ordering, state in plain text: Drive power P [kW] Drive speed n [rpm] Maximum volume flow qV max [l/min] S R2 Please contact us if you need a power diagram. RE 92202/02.2015, Bosch Rexroth AG
A7VO Series 63 Axial piston variable pump LA1 – Power controller with hydraulically proportional power override 14 LA1S5 – Power controller with load sensing and hydraulically proportional LS-override By connecting an external pilot pressure at port X6, it is possible to override proportionally the differential pressure Δp of the load sensing control. Increasing pilot pressure lower Δp setting. An example of this is shown in the characteristic curve below. Please consult us before carrying out project planning. Differential pressure pLS [bar] Characteristic curve LA1S5 25 18 14 10 5 0 5 10 15 20 25 30 Pilot pressure pX6 [bar] Schematic LA1S5 X4 X3 X6 U R1 A Vg min Vg max S R2 Bosch Rexroth AG, RE 92202/02.2015
Axial piston variable pump A7VO Series 63 15 DR – Pressure controller DR – Pressure controller The pressure control limits the maximum pressure at the Schematic DR pump outlet within the control range of the variable pump. The variable pump only delivers as much hydraulic fluid as is required by the consumers. If the operating pressure exceeds the setpoint value set at the integrated pressure valve, the pump control will shift toward a smaller U R1 displacement and the control deviation will decrease. B(A) When depressurized, the pump is swiveled to its initial A1 position Vg max by an adjustment spring. Setting range of pressure control 50 to 350 bar When ordering, state the setting in plain text. Notes Vg min For versions with controller DR, a drain line is needed Vg max from port T1 to the reservoir. X3 Any pressure-relief valve included in the system to limit the maximum pressure must be set to a cracking pres- T1 sure at least 20 bar above the controller setting. S R2 M1 max Operating pressure pB [bar] 350 max. 10 bar Characteristic curve DR Zero-stroke operation The standard pump unit is designed for intermittent constant pressure operation. Short-term zero-stroke operation ( 1 min.) is permissible up to an operating pressure pmax 315 bar at a reservoir temperature of 50 C. In the case of longer zero-stroke operation ( 1 min), bearing flushing should be carried out via flushing port U. Flow port 50 U R1 T1 min qV min flow qV [l/min] S qV max R2 Flushing flow (recommended) NG qV flush l/min 28 55 80 107 160 3 4 6 8 12 Temperature of flushing fluid reservoir temperature RE 92202/02.2015, Bosch Rexroth AG
16 A7VO Series 63 Axial piston variable pump DR – Pressure controller DRG – Pressure controller, remotely controlled Characteristic curve DRG A separate sequence valve with port plate provides the the single line length of 5 m. The valve is supplied with high pressure from port A1 of the pump. The system feeds back via port X3 the control power of the valve into the pump; the valve adjusts the pump back to Vg min. Note that ports T of the sequence valve and T1 of the pump are returned to the reservoir (cooler). Setting range of pressure control 50 to 315 bar When ordering, state the setting in plain text. 315 Operating pressure pB [bar] from the pump; in this connection, you should not exceed 50 Notes max. 10 bar pressure control function. The valve is arranged separate max min flow qV [l/min] qV min For versions with controller DRG, a drain line is qV max needed from port T1 to the reservoir. Any pressure-relief valve included in the system to limit the max. pressure must be set to a cracking pressure Schematic DRG 1 at least 20 bar above the controller setting. 2 You must order the sequence valve and the port plate separately. Sequence valve (1): DZ5DP2-1X/315YMSO21 U P R1 A (Material number R900495604) A1 Port plate (2): G 115/1 (Material number R900424379) Vg min Vg max X3 T1 S R2 Bosch Rexroth AG, RE 92202/02.2015 M1 A T
Axial piston variable pump A7VO Series 63 17 DR – Pressure controller DRS – Pressure controller with load sensing Characteristic curve DRS Notes needed from port T1 to the reservoir. The pressure controller overrides the load-sensing controller, i.e. the load-sensing function operates below the set pressure. 350 max Operating pressure pB [bar] For versions with controller DRS, a drain line is max. 10 bar For description of load sensing, see page 12. 50 min flow qV [l/min] qV min qV max Schematic DRS U X4 R1 A A1 1 Vg min Vg max X3 T1 S R2 M1 The measuring orifice (control block) (1) is not included in the scope of delivery. RE 92202/02.2015, Bosch Rexroth AG
18 A7VO Series 63 Axial piston variable pump HD – Proportional hydraulic control HD – Proportional hydraulic control The proportional hydraulic control provides continuous control of the displacement. Control is carried out propor- Characteristic curve HD1 positive control increase in control pressure (Vg min – Vg max) Δp 10 bar 40 Maximum permissible pilot pressure pSt 40 bar 35 Control from Vg min to Vg max (positive control) As the pilot pressure increases, the pump swivels to a larger displacement. Start of control (at Vg min) can be set to 4 to 15 bar When ordering, state the start of control in plain text. A control pressure of 40 bar is needed to swivel the pump from its initial position Vg min to Vg max. Pilot pressure pSt [bar] tional to the pilot pressure applied at port X1. 30 25 20 15 10 5 4 The necessary control power is taken from the operating 0 pressure or the external control pressure applied to port Y3. 0.2 0.4 0.6 0.8 1.0 Displacement Vg/Vg max To ensure that control is guaranteed at a low operating pressure of 40 bar too, port Y3 must be supplied with an external control pressure of about 40 bar. Schematic HD U M1 R1 B(A) Vg min Vg max A1 T1 X3 S R2 Y3 X1 Bosch Rexroth AG, RE 92202/02.2015
Axial piston variable pump A7VO Series 63 19 HD – Proportional hydraulic control HD1G – Proportional hydraulic control with pressure Characteristic curve HD1G positive control cut-off, remotely controlled from the pump; in this connection, you should not exceed the single line length of 5 m. The valve is supplied with high pressure from port A1 of the pump. The system feeds back via port X3 the control power of the pump into the valve and at port A of the sequence valve's port plate diverts it into the reservoir; if the set pressure command value is exceeded, this adjusts the pump back to Vg min. Pressure cut-off setting range 50 to 315 bar 315 Operating pressure pB [bar] pressure cut-off function. The valve is arranged separate 50 When ordering, state the pressure cut-off setting in plain text. max. 10 bar A separate sequence valve with port plate provides the max min flow qV [l/min] qV min qV max Notes Port A from the sequence valve must be returned to the reservoir (cooler). Schematic HD1G 1 Any pressure-relief valve included in the system to limit the max. pressure must be set to a cracking pressure at least 20 bar above the controller setting. You must order the sequence valve and the port plate separately. 2 U P B(X) A T M1 R1 B(A) Sequence valve (1): DZ5DP2-1X/315XYMSO20 (Material number R900490554) Vg min Port plate (2): G 115/1 Vg max (Material number R900424379) A1 T1 X3 S R2 Y3 X1 RE 92202/02.2015, Bosch Rexroth AG
20 A7VO Series 63 Axial piston variable pump EP – Proportional electric control EP – Proportional electric control The proportional electric control, type EP, provides continu- Characteristic curve EP2 positive control 800 the electric control current applied to the solenoid. 700 Control from Vg min to Vg max (positive control) As the pilot pressure increases, the pump swivels to a larger displacement. A control pressure of 40 bar is needed to swivel the pump from its initial position Vg min to Vg max. The necessary control power is taken from the operating pressure or the external control pressure applied to port Y3. Control current I [mA] ous control of the displacement. Control is proportional to 600 500 400 300 200 100 To ensure that control is guaranteed at a low operating pressure of 40 bar too, port Y3 must be supplied with an 0 0.2 external control pressure of about 40 bar. 0.4 0.6
A7VO Series 63 RE 92202 Edition: 02.2015 Replaces: 05.2012 Ordering code 2 Hydraulic fluids 4 Shaft seal ring 5 Flow direction 5 Operating pressure range 6 . No te the project planning notes on page 42! Preser vation: - Up to 12 mont hs as standard - Up to 24 mont hs long-term (state in plain text when ordering)
Axial piston variable pump A7VO Data sheet Series 63 Sizes NG250 to 500 Nominal pressure 350 bar Peak pressure 400 bar Open circuit RE 92203/06.09 1/52 Replaces: 05.99 Features – Variable axial piston pump with tapered piston rotary group in bent axis design for hydrostatic drives in open circuits
for your axial piston variable pump A10VO or A10VSO. Please request the installation drawing from your contact at Bosch Rexroth. Installation drawing Axial piston variable pump A10V(S)O, size 18 (A10VSO), size 28 to 140 (A10VO) Contains the permissible technical data. 92701 Data sheet Axial piston variable pump A10VSO, size 18 to 140
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7.4.9 Hydraulically connecting the axial piston unit 36 7.4.10 Electrically connecting the axial piston unit 41 7.5 Performing flushing cycle 42 8 Commissioning 43 8.1 Initial commissioning 43 8.1.1 Filling the axial piston unit 43 8.1.2 Testing the hydraulic fluid supply 44 8.1.3 Performing a functional test 45 8.2 Running-in phase 45
Axial piston pump A10V in swashplate design is used for hydrostatic transmission in open loop circuits. Flow is proportional to drive speed and displacement. By adjusting the position of the swashplate it is possible to smoothly vary the flow. A10V - 52/53 Valve plate End cover Control valve Variable Piston DFR piston Cylinder block Swash plate .
RE-A 92711/04.2017, Bosch Rexroth AG Axial piston variable pump A10VSO Series 31 Hydraulic fluids 5 Filtration of the hydraulic fluid Finer filtration improves the cleanliness level of the hydraulic fluid, which increases the service life of the axial piston unit. A cleanliness level of at least 20/18/15 is to be maintained according to ISO 4406.
forces the swashplate into an inclined position. The pump control, acting on input from the operator, by modulating pressure balance across the servo piston, sets displacement in the system circuit. Service Manual Series 90 Pumps Introduction 520L0818 Rev File Size: 3MBPage Count: 72Explore furtherSeries 90 Axial Piston Pumps Technical Information Manualwww.precisionfluidpower.comSeries 90 180cc Pump Parts Manual - PV Globalpvglobal.com.sgSeries 90 130cc Pump Parts Manual - PV Globalpvglobal.com.sgSeries 90 100 cc Axial Piston Pump Parts Manualwww.moorepumps.comSundstrand Series 90 Replacement Partsscrewmax.comRecommended to you b
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