linde_hydrostatic_drive_7_07.pdf

Excellence at work.

Linde Material Handling (UK) LtdKingsclere Road, Basingstoke, Hampshire RG21 6XJ

Tel +44(0)1256 342000, Fax +44(0)1256 342923

www.linde-mh.co.uk, [email protected]

Spotlight on. Linde hydrostatic drive.

Linde Material Handling

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L738 Spotlight On - Linde Hydrostatic Drive.qxd 13/7/07 10:17 Page 2

Hydrostatic drive. Made by Linde.

Leading-edge fork lift truck engineering is inseparably linked to the Lindehydrostatic drive concept. Not surprisingly, it is acknowledged as theultimate drive system superior to any other to achieve maximum lifttruck performance.

Linde has refined hydrostatic drive to match the working conditions ofmodern day fork lift trucks perfecting it to meet every requirement forhandling ease, durability, efficiency and ergonomic operation.

It is this technology on which Linde forklifts have built five decades ofcontinuing success. Users everywhere appreciate the proven fact that Lindehydrostatic drive moves more in the world of materials handling bysignificantly reducing both physical demands and work cycle times.

How does hydrostatic drive work? What is it about hydrostatic drive thatgives Linde trucks their outstanding advantages and Linde truck users acompetitive edge? Read on for the answers.


Fixed swashplate

Piston and slipper

Cylinder block

Cylinder block joined to shaft

F1

Piston

Swashplate

F2

Resulting rotation

Sliding motion produces rotation by the elementary principle of theinclined plane

Direction Selection.

Accelerator pedals

Wheel motors

Engine

Hydrostatic pump Tilting swashplate(forward driveposition)

Accelerator pedals

Engine

Hydrostatic pump Tilting swashplate(forward drive position)

Wheel motors

The hydrostatic pump, which basically operates in a similar way to a hydrostaticmotor, differs in one key respect. Because the angle of the swashplate can bealtered, the rate at which oil is delivered by the pump can be controlledcontinuously and precisely independently of the speed at which the enginedrives the pump.

When the truck is stationary, the swashplate is in neutral position where thepistons do not stroke in and out. As a result, no oil is pumped and no power istransmitted. Pressing the forward accelerator pedal changes the angle of theswashplate and the pump starts delivering the flow of oil needed to drive thewheel motors forward. As the swashplate is tilted further, the truck speedincreases.

Changing direction of travel is just as easy and convenient. Pressing the reverseaccelerator pedal tilts the swashplate in the opposite direction, reversing the inlet andoutlet ports so that the oil flow drives the hydraulic motors in the other direction. Theoperation is seamless with no adverse effect on the transmission as it transferssmoothly and safely from maximum speed forward through neutral to maximum speedin reverse.


The smooth revolution.

The H 14 H 35 Linde models are equipped with the unique Lindehydrostatic direct drive. Two hydraulic wheel motors integrated inthe front drive axle transfer rotation of the output shaft direct to thewheels, ensuring precise and perfectly controlled transmission ofpower.

Oil pressure directly converted to rotation for forward or reverse travel.

The revolutionary feature of this innovative technology is that thepistons of the wheel motors are fitted in a rotating cylinder blockand ride on a fixed swashplate. Oil pressure from the pump actingon the motor pistons results in rotary motion, almost entirelywithout friction, which is transmitted to the cylinder block. Wear isminimised by an oil film between the piston and swashplate of theaxial-piston pump that prevents metal to metal contact.

Speed and direction of travel are controlled by the hydrostaticpump driven by the trucks engine.

3 Pressure of oil flow controls the output torque.3 Rate of oil flow controls the truck speed.3 Direction of oil flow controls the travel direction.

Design advantage.Durability and efficiency.

Mechanical breakdowns and high servicing expense are a thing of the past.Durability and efficiency are here to stay with Linde hydrostatic drive.

No differential. Because the flow of oil delivered by the pump is evenlydivided between the two hydraulic motors, no differential is needed forpower transmission.

No conventional service brake. Hydrostatic drive brakes the truck by haltingthe flow of oil. As the accelerator pedal is released, the truck progressivelyand smoothly decelerates to a stop.

No gearbox. Infinitely variable control of oil flow rate and seamless changeof travel direction made possible by Linde hydrostatic drive eliminates theneed for a mechanical gearbox.

No clutch. The hydraulic pump is set to neutral position, with the acceleratorpedals eliminating the need for a clutch.

Diesel/LPG engine

Hydraulic pump

Hydraulic motors

Reduction gearing

Wheels

Linde forklift

Diesel/LPG engine

Clutch

Powershift

Gearbox

Gearshift

Reduction gearing

Differential

Brakes

Wheels

Conventional forklift

3 Fewer components,loss-freepower transmission


Hands and feet normally have a lot to do when operating a fork lift truck.Much of it has to be done more or less simultaneously. Training andexperience can reduce the physical input and Linde hydrostatic drive hasan even more significant impact in this area.

Simplicity.

Travelling forward and in reverse is controlled by two separate acceleratorpedals. The operator of a Linde forklift is able to keep both feet on theaccelerator pedals. The brake pedal is only actuated in an emergencysituation, as Linde hydrostatic drive automatically applies the brakes as theaccelerator pedal is released. Handling of the truck itself is responsive andprecise. The operator always feels in full control with minimum physicalinput required.

The hands also have simpler tasks. The left hand operates the compactsteering wheel while the right hand actuates fingertip controls for all mastand fork functions. Complete separation of the travelling and load handlingfunctions drastically reduces the number of feet andhand movements required for each loadhandling cycle and enables the operator toconcentrate fully on the immediate task,manoeuvre more accurately and lift orlower with greater precision.

Picking up a load, transporting it,putting it down and making the returnrun requires 58 actions from theoperator on a forklift equipped withconventional gearbox, but only 28 on aLinde forklift!

No inching pedal.No conventional brakes.

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Linde forklifts load/unload more delivery vehicles in less time,using less fuel and with less maintenance requirements.

Without Linde hydrostatic drive the operator must go through many unnecessarylifting and manoeuvring operations, which costs time; and time is money! Lindehydrostatic drive keeps a Linde forklift squarely on track, accelerates quicker andgets road transport vehicles unloaded much more efficiently. This is achievedwithout working faster; its just that the Linde truck does exactly what the operatorwants it to do.

No slipping.No spinning.

With Linde hydrostatic drive the forklift remains securely on track andmanoeuvres with utmost precision. Absence of a gearbox results in maximumefficiency of every truck movement. That adds up to greater reliability in loadhandling with distinctly better productivity.

Benefits all around.

Fuel economy is improved by as much as 30 per cent depending on theapplication because of the engine running within the optimum range of rpm atall times and its output being converted fully into travel motion.

Oil change intervals are only every 6,000 operating hours as a result of thealmost wear-free working characteristics of Linde hydrostatic drive. The oillasts six times longer than with hydrodynamic drive.

Long life and low maintenance costs are achieved owing to the elimination ofconventional mechanical consumable parts from the hydrostatic drive train.

Because it takes up to 20 per cent less time to do the same job with the twinaccelerator pedals on a Linde hydrostatic drive forklift, there is less strain onboth the operator and machine.


linde_hydrostatic_drive_7_07.pdf

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