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Basic Hydrostatic (closed circuit)

Basic Hydrostatic (closed circuit). Introduction, July 2012. What do you know about a closed circuit?. Components? Applications? Advantage? Only one fact per participant. Main Menu. Exposition closed circuit . Definition Pump and Motor. Diesel Engine.

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Basic Hydrostatic (closed circuit)

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  1. Basic Hydrostatic (closed circuit) Introduction, July 2012

  2. What do you know about a closed circuit? Components? Applications? Advantage? Only one fact per participant

  3. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  4. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  5. Exposition of the closed circuit Production MENU Pump and motor form a „Hydrostatic Transmission“

  6. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  7. Definition: Pump/MotorProduction MENU • Pump Transport of fluids and gases. At the same time transforming mechanical power into hydraulic power. • Motor Performs mechanical work by transforming hydraulic power into mechanical power.

  8. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  9. Diesel Engine in Mobile Work MachinesProduction MENU Attributes: • Steady engine speed at partial load condition • Maximum engine power at maximum load condition • Increasing engine speed increases power due to roughly constant engine torque • Direct drive vehicles (w/o transmission) have low acceleration • It‘s recommended to use a transmission between the engine and final drive • In this case it is recommended to use: „Hydrostatic Transmission“

  10. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  11. Advantages of Hydrostatic Transmission MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Adjustable/ Programmable Continues variable transmission

  12. Advantages of Hydrostatic Transmission Flexibility MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Adjustable/ Programmable Continues variable transmission

  13. Advantages of Hydrostatic Transmission Flexibility MENU • Independent arrangement of pump(s) and motor(s) • Power transfer via hoses from pump to motor • Independent arrangement of the Engine • Pump arrangement as stacks or assembled to splitter box • Wide transmission ratio

  14. Advantages of Hydrostatic Transmission Continues Variable Transmission MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Adjustable/ Programmable Continues variable transmission

  15. Advantages of Hydrostatic Transmission Continues Variable Transmission ] N [ e c r o F e v Installed Engine Power i t c a r T Motor Ratio Pump Ratio A Speed [km/h] B MENU • Continuously variable speed w/o loss of traction • No clutch is required to change the vehicle direction from forward to reverse Mechanical transmission Hydrostatic transmission - source 1 - - source 1 -

  16. Advantages of Hydrostatic Transmission Hydrostatic Braking MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Adjustable/ Programmable Continues variable transmission

  17. Advantages of Hydrostatic Transmission Hydrostatic Braking MENU • The engine braking power is the capability of the engine to absorb the braking power of the hydrostatic transmission • Vehicle braking capability depends on engine braking power • Lower level of engine braking capability for new tier IV diesel engines acceleration motor principle of operation: pump - source 2 - deceleration/ braking motor principle of operation: pump

  18. Advantages of Hydrostatic Transmission Hydrostatic Braking MENU • If the vehicle braking power requirement exceeds the engine braking power capability the engine can overspeed and could be damaged deceleration/ braking pump motor principleofoperation:

  19. Advantages ofHydrostatic TransmissionHigh Power Density MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Adjustable/ Programmable Continues variable transmission

  20. Advantages ofHydrostatic TransmissionHigh Power Density MENU • Power density is the relationship between power and package size • Engine (here 90 kW) has lower power density than the hydrostatic pump (here H1P089)

  21. Advantages ofHydrostatic TransmissionFurther Details MENU Variable and constant speed of engine Flexibility Hydrostatic Braking Hydrostatic Transmission High power density Continues variable transmission Adjustable/ Programmable

  22. Main Menu Exposition closed circuit Definition Pump and Motor Diesel Engine Comparison to torque converter Advantages Basic Hydrostatic (closed circuit)

  23. Comparison HST vs. Torque ConverterTorque Converter construction MENU Impeller Stator Impeller Turbine Turbine Stator - source 2 - - source 2 -

  24. Comparison HST vs. Torque ConverterOverview MENU

  25. Comparison HST vs. Torque Converter MENU Hoses allow flexible arrangement of pump and motor

  26. Comparison HST vs. Torque Converter Swash plateangle Current mA Engine rpm 3 4 5 6 2 7 1 0 MENU • Adjustable drive curve for Control for example the ACII Control for the Pump with different programmable driving curves

  27. Comparison HST vs. Torque Converter MENU • Tractive force of Torque Converter is depending on differential speed • Tractive force of HST is controllable

  28. Comparison HST vs. Torque Converter MENU • Shift of the Drive Direction with HST is possible by shift stroke of pump to opposite side • Shift of the Drive Direction with Torque Converter only by shift a gear and use a clutch • Clutch is a component with wear

  29. Comparison HST vs. Torque Converter MENU • Blocked Drive Train is similar to drive against a wall, drive train speed at working engine • HST will destroke the pump to zero degree* • Torque Converter will be overheated by a large differential speed *with Pressure Limiter

  30. Comparison HST vs. Torque Converter MENU • Torque Converter requires a mechanical gear shift transmission to reach the required transmission ratio • HST has a large transmission ratio

  31. Comparison HST vs. Torque Converter MENU • HST is programmable to react on drop in diesel engine speed by drive of auxiliary machines

  32. Comparison HST vs. Torque Converter MENU • Torque Converter is direct depending by drop of engine speed

  33. Comparison HST vs. Torque Converter MENU

  34. The End MENU

  35. Overview Literature Sources MENU - Source 1 - Ölhydraulik – Handbuchfür die hydrostatischLeistungsübertragung in der Fluidtechnik; Findeisen, D.; Springer - Source 2 - HydrodynamischeAntriebskomponenten in Forstschleppern; JörgHittenbeck; IFA - Source 3 - http://de.wikipedia.org/wiki/Drehmomentwandler - Source 4 - http://de.luk.de

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