Direccion y Frenos

Drive and Control Systems for Excavators

2k Systems for crawler and wheeled excavators formachines ranging from 1.5 to 800 tons

k High and medium pressure range systems

k Implement hydraulics with load sensing or opencenter controls

k Travel and slew drives in open and closed circuits

k Electronic systems for all of the control managementand monitoring functions

k Hydraulic steering and braking systems for wheeledexcavators

k Auxiliary drives, e.g. winch drives and cooling fans

Drive and control systems for mini excavators seedata sheet RE 98064.

There are differing drive and control hydraulicdemands for excavators, these are dependenton the machine size and area of application.This leads to the use of differing systems.

The Mannesmann Rexroth group of companies with its businesssectors of Rexroth Hydraulics, Brueninghaus Hydromatik andLohmann + Stolterfoht are in the position of being able to provideall systems from one supplier.

When defining drive and control concepts, our aim is to selectthe most economic and optimum technical solutions. We are ableto select in close collaboration with the machine manufactureroptimum solutions.

Our project engineers have extensive experience in the design ofdiffering machines and systems:

Drive and control systems for crawlerand wheeled excavators

3Excavator types

Spider excavator Drag-line excavator

Crawler excavator

Mining excavator Telescopic excavator

Wheeled excavator

4Open center control

2 circuit system (example: 20 ton crawler excavator)

GFB + A2FE(slew drive)

A8VO(travel and implement

hydraulics)

8M8(control)

GFT + A6VE(travel drive)

TH6(pilot control units)

Preferred system for machines thathave to operate under adverseconditionsk A system that has been proven over many years in numerous applications

k A simple and robust design

k Easy system matching

k Good fine controllability

k Direct control relationship

k Good torque control with load feedback

k Particularly efficient work under full load

k A very service friendly system

k Compact monoblock without manyconnections

Flow summation within the valve blocksaves additional pipe work

A motion control spools for crawler drives can be integrated if required

Tandem drive of actuators for fast working movements is possible

k Particularly robust and proven doublepump

1 housing with a common suction port

A short build length provides goodinstallation conditions

Cast on SAE diesel motor flange forcompact installation

Integrated pilot oil pump and pressurevalve

Pumps for additional options can be built-on without the need for a splitter gearbox

Applications arek Compact and standard excavators

k Drag-line excavators

k Excavators as base carriersSwing gear box GFB with fixed displacementmotor A2FE

5LUDV control

1 circuit system (example: 13 ton wheeled excavator)


A11VO(travel and implement

hydraulics)

1M7 + 5M7 + 1M7(control)

A6VM + MHB(travel drive)

TH6(pilot control unit)

Preferred system for compact andstandard excavators with limitedinstallation space

k Sensitive and load independent actuationof differing actuator functions

k Only one variable displacement pump forall functions

k Easy installation and assembly

k Very good fine controllability also withparallel operation

k Defined speed allocation due to optimumflow distribution

k Particularly economic operation whenunder partial load, e.g. grading

k Additional optional actuators can be easilyrectro fitted by adding additional valves

k Priority supply of the slew drive

k Loss-free slew drive acceleration

k Torque control for the slew drive

k Pump with an SAE diesel motor flangefor compact installation

Applications are

k Compact and standard excavators

k Drag line excavators

k Spider excavators

Wheeled excavator travel drive with an A6VMvariable displacement motor and a MHBmotion control valve

6LUDV control

1.5 circuit system - an open circuit slew drive (example: 15 ton wheeled excavator)

Particularly advantageous system forexcavators that are used as materialloading machines or those thatperform lifting functions

The implement hydraulics are identical to the1 circuit LUDV system, however the separateopen circuit slew drive pump provides thefollowing features:

k Independent slew drive function withabsolute priority

k Favourable boosting, system cooling andfiltration via the slew drive pump

k Higher pressures are permitted on theslew drive than the main circuit, therefore,it is possible to utilise a smaller slew drivemotor

k Defined power allocation to the slew drive

k Additional auxiliary actuators can besupplied by the slew drive pump via opencenter control valves

Applications are

k Compact and standard excavators

k Telescopic excavators

k Excavators for material loadingoperations


2SX + 3M7 + 1M8(control)


(travel and implement hydraulics)TH6(pilot control units)

A11VO implement pump with an A10VOslew drive pump

A11VO + A10VO

7LUDV control

1.5 circuit system - closed circuit slew drive (example: 20 ton wheeled excavator)


A11VO + A4VG

1M7 + 5M7(control)


TH6(pilot control unit)

Used in machines where particularimportance is placed on effective slewdrive functions

The implement hydraulics are identical to the1 circuit LUDV system, however the separateclosed circuit slew drive pump provides thefollowing features:

k Independent slew drive function withabsolute priority

k Good utilisation of the permissible pressurelevel in the slew drive

k Particularly effective slew drive due to thedirect connection between the pump andslew drive motor without any restrictionpoints

k Higher pressures are permitted in the slewdrive than the main circuit, therefore, itis possible to utilise a smaller slew drivemotor

k Defined power allocation to the slew driveand limitation by the sensitive DWD slewdrive control

k Loss-free acceleration and deceleration ofthe slew drive results in lower coolingrequirements

k Energy reclamation when decelerating theslew drive due to the closed circuit

k Adjustable basic decelerating torque

Applications are

k Standard excavators

k Excavators for material loading operations

k Telescopic excavators

(travel and implement hydraulics)

8Mining excavators

Multi-circuit 6/3-way open center system (example: 100 to 800 ton crawler excavator)


PVG + A4VSO + A4VG(travel and implement hydraulics)

3MO(control)

GFT + A4VSE(travel drive)

3MO(control)) 3MO

(control)

TH6(pilot control units)

Multi-circuit open center control systems formachines up to 800 tons in operating weight

k Open or closed circuit slew drives

k Single pumps with a displacement volumeof up to 1000 cm3 per revolution

k Electronic load limit control for the entirepower limitation control system

k Valve blocks for flows up to 1600 l/minper valve section

k Simple design, easy system matching anddirect control relationships

k Good torque control with load feedback

k Easy assembly and logic linking via theelectro-hydraulic control of the directionalvalves

k Comfortable control without noise andtemperature transmission into theoperators cab

k Hydraulic fan drives with electronic control

k Travel and slew gearboxes matched tothe long service life requirements

k Proven components with a long service life

k Experience gained over many years

Applications are

k Mining excavators

9B

S L1

U

U

A

B

LS

S

Drive with a fixed displacement pump

Fan wheel drive power 3...10 kW

Drive with variable displacement pump, electronic control

Fan wheel drive power 6...30 kW

Variable displacement pump

Supply voltage U=24V / 12VTemperature optionAmbient air temperatureSuper charger air temperatureRetarder

Control electronicsMHVDL

Oil cooler

Cooling medium

Fan wheelFan motor

Thermo-pressure valvetype MHDBDT

Fan motorMF2G2

External gear pump with integrated priorityflow divider and maximum pressure limitationData sheet RE 10046

External gear motor for fan drives, fan ismounted separately

Thermo-pressure valve MHDBDT 06Data sheet RE 64309

Cooling power is also electronicallycontrollable via the MHVDL proportional valve and fan electronicsData sheet RE 29878

Variable displacement pumpA10VO...DRG (ED)Data sheet RE 92701

Internal gear motor MGF2 oraxial piston motor A10FSMData sheet RE 91180

Fan electronicsData sheet RE 29878

Cooling power is also hydraulically controllable with the MHDBDT 06 thermo-pressure valveData sheet RE 64309

Thermo-pressure valve MHDBDT 06

Fan electronics MHVDL

Fan drive

A10VO

10

MC7+

SoftwareGLB

STM

BB-3

RS 232

Electronics

Electronic speed sensing control with additional functions

Variable displacement pump A11VO + A4VG

Pre-set dieselRPM

Mode1 2 3

Hoist loadincrease

Work Temperature Travel pedalwith lockBrake light

BB-3 SoftwareBodem

DiagnosticsParameter settingProcess monitoring

Diagnostics display

Hoist load increase

Posi

tion

com

man

dva

lue

Posi

tion

actu

al v

alue

Actu

al R

PM

Mechanicalinjection pump

Electricalactuator

k Optimum conversion of the drive powerwith changing operating conditions

k Programmable power modes

k Safety monitoring

Microcontroller MC7+ Software GLBfor RPM dependentcontrol of hydraulicpumps

Data sheets RE 95050,RE 95072

Adjustment motorSTMfor adjusting the dieselinjection pump

Data sheet RE 95035

Pressure reducingvalve DREfor the proportionalconversion of the GLBsignal into a pilotpressure

Data sheet RE 29181

Encapsulatedpotentiometer GPfor the acquisition of theaccelerator pedalposition

Data sheet RE 95037

Impulse detectorID/HDfor the inductiveacquisition of speeds,e.g. diesel motor RPM

ID see RE 95038HD see RE 95042

Control box BB-3for diagnostics andparameterisation inconjunction with the MCmicrocontroller

Data sheets RE 98080,RE 29798

11

Electronic control of directional valves

Electronics

k The pilot control components can belocated wherever required

k Low installation requirements

k The machine operator is not subjected to heat or noise

k Simple operation, low forces required

k Easy storage and reproduction ofcharacteristic values

k Easy matching of the unit characteristics

Digital amplifierMHVDO 6with 6 switched outputs

Data sheet RE 29871

MicrocontrollerMHVO 18for up to 18 proportionaloutputs and up to 16switched outputs

Data sheet RE 29884

MicrocontrollerMHVD 4with 4 proportionaloutputs and up to 4switched outputs

Data sheet RE 29872

Electronic remotecontrol THE 6Data sheet RE 29771

12

Diesel

Diesel

Brake lightswitch

Accumulator pressurewarning switch

Brake pedal

Accumulatorpressure warning

Accumulatorloading valve

Diesel

Hydraulic remotely powered braking system for wheeled excavators

Compact design

k Piping reduced to a minimum

k Parking brake electrically actuated

k Possibility of directly mounting the accumulator

k Sensitive metering

Modular design

k Components have a low space requirement

k Components can be located wherever required

k Sensitive metering

k Quickly ready for operation

Compact brake blockLT13, Data sheet RE 66220

Accumulator loadingvalve LT06, Data sheetRE 66191

Compact brake blockLT17, (for mounting inthe drivers cab) Data sheet RE 66222

1 circuit remotelypowered brake valveLT05, Data sheet RE 66144

Inching brake valveLT31, Data sheet RE66226

Brakes

Additional (optional)actuators

Brake pedal

Spring loadedaccumulator

2 circuit brakevalve

Parking brakevalve

Additional (optional)actuators

2 circuit brakevalve

Brake lightswitch

Parking brakevalve

Accumulatorloading valve

Spring loadedaccumulator

13

Steering

Hydrostatic steering for wheeled excavators

Steering unit type LAGCNominal sizes 50 to 630Series 1XNominal pressure 175 barMaximum flow 63 l/min

Data sheet RE 14365

k Integration of all of the valves requiredfor the hydrostatic steering circuit thatare needed to protect the steering unit,pump and steering axle

k Easy steering during servo operation

k Emergency steering facility provided

k Low noise

k More flexibility for the designer

k Extremely good power to weight ratio

14

Installation examples

Slew drive with a plug-in fixed displacement motor A2FEand slew gear box GFB

Track drive with plug-in variable displacement motor A6VEand turas gear box GFT

Axle drive with a variable displacement motor A6VMand motion control valve MHB

Drag-line excavator drive with a tandem pump A4VG anda fixed displacement pump A2FO

Compact excavator drive with a variable displacement pump A8VOand gear pump G2

Mining excavator drive with variable displacement pumps A4VSO 750built onto a pump splitter gear box GFC

15

Components

Variable displacement double pump A8VO with a large auxiliary drivewhich is fitted with a variable displacement pump A10VOfor open center control systemsData sheets A8VO: RE 93010, A10VO: RE 92701, G2: RE 10030

Variable displacement pump A11VO with a diesel motor mountingflange and built-on slew drive pump A4VG...DWDfor load sensing systemsData sheets A11VO: RE 92500, A4VG: RE 92005

Control block M7for LUDV load-sensing systemsData sheet RE 64287

Control block 7M8for open center control systemsData sheet RE 64294

Plug-in variable displacement motor A6VE with integrated motioncontrol valve for crawler excavator turas drivesData sheet RE 91606

Variable displacement motor A6VM with built-on motion control valve MHB for wheeled excavator axial drivesData sheets A6VM: RE 91604; MHB: RE 64317

Drive and Control

Components

Turas drive GFTwith plug-in variabledisplacement motor A6VEoptionally with plug-in fixeddisplacement motor A2FE

For further information see data sheet RE 77110

Slew drive GFBwith plug-in fixeddisplacement motor A2FE

For further information seedata sheet RE 77201

Variable displacement pumpA4VSOopen circuit


Pilot control units TH6and TH7for hydraulic control

For further information seedata sheets RE 64551, RE64552, RE 64555, RE 64558

Plug-in switching motor A10VECmotion control valve and pressure safety integrated intothe connection plate


Variable displacement doublepump A2OVOopen circuit


Pipe burst safety valve MHRB


Remotely powered brake LT 13


Brueninghaus Hydromatik GmbHGlockeraustrae 2D89275 Elchingen, GermanyTel +49 (0) 7308 820Fax +49 (0) 7308 7274

Mannesmann Rexroth AGRexroth HydraulicsJahnstrae 3-5D97816 Lohr am Main, GermanyTel +49 (0) 9352 180Fax +49 (0) 9352 181040

Lohmann + Stolterfoht GmbHMannesmannstraeD58455 Witten, GermanyTel +49 (0) 2302 877360Fax +49 (0) 2302 877404

RE 9

8055

/04.

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