WO2012014006A1 - Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur - Google Patents

Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur Download PDF

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Publication number
WO2012014006A1
WO2012014006A1 PCT/IB2010/002222 IB2010002222W WO2012014006A1 WO 2012014006 A1 WO2012014006 A1 WO 2012014006A1 IB 2010002222 W IB2010002222 W IB 2010002222W WO 2012014006 A1 WO2012014006 A1 WO 2012014006A1
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WO
WIPO (PCT)
Prior art keywords
pressure requirement
fluid pressure
implement
pipelayer
hydraulic
Prior art date
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Ceased
Application number
PCT/IB2010/002222
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English (en)
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/IB2010/002222 priority Critical patent/WO2012014006A1/fr
Publication of WO2012014006A1 publication Critical patent/WO2012014006A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements

Definitions

  • the present invention relates to land vehicle hydraulic systems generally and more specifically to pipelayer hydraulic assemblies mounted to track-type tractors.
  • Hydraulic track-type pipelayers consist of a track-type crawler tractor with a pipelayer structure mounted to it, along with the associated hydraulic hook and boom winches, the winch hydraulic-controls, and all the necessary rigging.
  • the track-type crawler tractor provides the power to drive the hydraulic winches, and any other hydraulic system fitted or used to control the crawler tractor.
  • the pipelayer hydraulic system can be driven either directly with a dedicated implement pump supplying only the pipelayer system, or connected in parallel with the tractor hydraulic implement system.
  • the tractor implement system is also arranged in parallel.
  • a parallel system means that when hydraulic functions are actuated simultaneously, hydraulic fluid flow is divided to each function. It is known however, that there will be a greater flow to the path with the least resistance. Due to this fact, the pipelayer is connected to the tractor implement system in parallel, either the tractor implement system or the pipelayer system could be impaired when used simultaneously. This is because the fluid directed to the path of least resistance could leave the other system with insufficient hydraulic pressure to adequately operate that system.
  • Crawler tractors have two methods for steering control: mechanical steering clutches, or hydraulic differential steering.
  • Mechanical steering clutches are completely separate from the hydraulic implement system, and are unaffected by it.
  • Hydraulic differential steering systems use a hydraulic steering motor to facilitate a change of direction.
  • the hydraulic steering motor can be powered either by its own dedicated pump, separate from the implement system (a two-pump system), or by the tractor implement pump (a single-pump system).
  • the steering function could be severely compromised unless it is given precedence over the other tractor implement functions.
  • the steering of the tractor could be drastically impaired if a load placed by the pipelayer implement consumes hydraulic flow, leaving insufficient flow for the steering function.
  • the hook winch would have a very low pressure requirement (least resistance) while having a high flow requirement.
  • the majority of hydraulic fluid would flow through the pipelayer' s hook circuit, leaving significantly less, and potentially insufficient, flow for the steering function. This is an extremely undesirable situation.
  • the system of the present disclosure connects an implement hydraulic system to a single-pump, differential steer, crawler tractor's implement valve in parallel.
  • the present load-flow system and process gives precedence to the tractor's essential operation which is in hydraulic fluid communication with an implement system (such as a pipelayer), by allowing the hydraulic power (pressure and flow) to be controlled in the essential operation independently of the hydraulic pressure requirements of the implement system. As a result, full control of the essential hydraulic operation is maintained regardless of the implement system demands.
  • a secondary function and sub-process also allow either the tractor's essential operation, or the implement system, to dictate the implement pump's supply-pressure output.
  • the term essential operation shall include any system of the tractor which relates to its essential operation and function, such as, but not limited to, the steering system.
  • the present disclosure includes a process for managing fluid flow for an essential operation and an implement connected in parallel to a single hydraulic pump.
  • the process includes the steps of determining the essential operation fluid pressure requirement; determining the implement fluid pressure requirement; and maintaining said essential operation fluid pressure requirement by providing fluid flow to the essential operation regardless of the implement fluid pressure requirement.
  • the present disclosure includes a process for managing fluid flow requirements for a steering system and a pipelayer system connection in parallel to a single pump hydraulic system.
  • the process includes the steps of:
  • Figure 1 depicts a schematic diagram of a single pump parallel hydraulic system including the apparatus and process of the present disclosure.
  • the system of the present disclosure in a preferred embodiment connects a pipelayer hydraulic system to a single-pump, differential steer, crawler tractor's implement valve in parallel. It gives precedence to the tractor's steering and implement system by allowing the hydraulic power (pressure and flow) to be controlled in the steering system independently of the hydraulic pressure requirements of the pipelayer system. In this way, full steering control is maintained regardless of the pipelayer system demands.
  • a secondary function also allows either the tractor steering and implement system or the pipelayer system to dictate the implement pump's supply- pressure output. Without the system of the present disclosure installed, steering control of single-pump, differential steer, crawler tractors would be unreliable with a hydraulic pipelayer system installed.
  • System 10 includes a tractor single-pump system 20, the load flow hydraulic fluid flow apparatus of the present disclosure 30, tractor steering system 40, pipelayer system 50, and tractor hydraulic tank 60.
  • load-flow apparatus 30 and pipelayer system 50 are preferably connected to the implement valve of a crawler tractor in parallel such that the tractor single pump 20 is in fluid communication with load-flow 30, which is, in turn, in fluid communication with both the tractor steering system 40 and pipelayer system 50.
  • Tractor single pump 20, tractor steering system 40, and pipelayer system 50 are in fluid communication with tractor hydraulic tank 60.
  • Hydraulic fluid is pumped by tractor single pump 20 from hydraulic tank 60, shown by flow diagram 22. Hydraulic fluid is pumped by the tractor single pump 20 into load flow apparatus 30, as shown at 24. Load flow apparatus 30 obtains the fluid flow pressure requirements of the tractor steering system and provides hydraulic fluid flow to steering to tractor steering system 40, as shown at 26. Load flow apparatus 30 also obtains the fluid flow pressure requirements of pipelayer system 50 and provides fluid flow to pipelayer system 50 at 28. Load flow apparatus 30 satisfies the fluid flow pressure requirements of tractor steering system 40 regardless and independent of the fluid flow pressure demands of pipelayer system 50. Fluid is returned by tractor steering system 40 to hydraulic tank 60, as shown at 32. Fluid is returned by pipelayer system 50 to hydraulic tank 60, as shown at 34.
  • tractor steering system 40 provides a signal 42 to load flow apparatus 30 regarding the fluid flow pressure required for proper tractor steering system function.
  • Pipelayer system 50 provides a signal 44 to load flow apparatus 30 regarding the fluid pressure requirement necessary for operation of the pipelayer system.
  • load flow apparatus 30 determines the greatest system pressure requirement necessary for the proper function of tractor steering system 40 and/or pipelayer system 50. This is done by comparing the tractor steering system pressure requirement signal 42 with pipelayer pressure requirement signal 44.
  • Load flow apparatus 30 provides a signal 46 to tractor single pump 20 regarding this greatest system pressure requirement 46.
  • Load flow apparatus 30 may include a microprocessor for receiving signals 42 and 44 and for determining the greatest system pressure requirement, the microprocessor may also include as an output for providing the greatest system pressure requirement signal 46 to single pump system 20.
  • the tractor single pump system 20 provides the fluid flow required to maintain the signaled greatest system pressure at 52.
  • Load flow apparatus 30 receives the flow required to maintain the greatest signal system pressure 52 from tractor pump system 20.
  • Load flow apparatus 30 distributes the fluid flow required by tractor steering system 40 at the required pressure 54.
  • Load flow apparatus 30 also provides fluid flow to pipelayer system 50.
  • the fluid flow to pipelayer system 50 from load flow apparatus 30 is the pump flow required to maintain the greatest system signaled pressure 52 less the fluid flow requirements at the required steering pressure 54 required by steering system 40. In this way, load flow apparatus 30 maintains at all times the required fluid flow to tractor steering system 40 at the required steering fluid pressure, regardless and independent of the pipelayer system 50.
  • load flow apparatus 30 will provide the necessary fluid flow to tractor steering system 40 required to maintain the tractor steering pressure requirement without a pressure drop due to fluid flow taking the path of least resistance caused by the lower pressure request of pipelayer system 50.
  • Load flow apparatus 30 may also provide the necessary fluid flow to maintain the required system pressure in either tractor steering system 40 or pipelayer system 50, depending on which produces the greatest system pressure requirement, which then becomes the greatest system pressure requirement signal 46. In this way, either the tractor steering system 40 or the pipelayer system 50 may dictate the pump flow 52 required to maintain the greatest system pressure (per signal 46).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention porte sur un système et un procédé pour gérer les demandes de débit de charge de fluide hydraulique pour un tracteur possédant un système hydraulique à une seule pompe. Le système relie un instrument hydraulique en parallèle et donne la priorité aux fonctions essentielles du tracteur, telles qu'un système de direction hydraulique, qui doivent être commandées indépendamment des demandes de pression hydraulique du système des accessoires. Le procédé comprend la détermination d'une demande de pression de fluide de fonctions essentielles ; la détermination de la demande de pression de fluide des accessoires ; et le maintien de la demande de pression de fluide des fonctions essentielles par la fourniture d'un débit de fluide hydraulique à la fonction essentielle sans tenir compte de la demande de pression hydraulique des accessoires.
PCT/IB2010/002222 2010-07-26 2010-07-26 Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur Ceased WO2012014006A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2010/002222 WO2012014006A1 (fr) 2010-07-26 2010-07-26 Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2010/002222 WO2012014006A1 (fr) 2010-07-26 2010-07-26 Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur

Publications (1)

Publication Number Publication Date
WO2012014006A1 true WO2012014006A1 (fr) 2012-02-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/002222 Ceased WO2012014006A1 (fr) 2010-07-26 2010-07-26 Système et procédé pour gérer des demandes de débit de charge pour un système hydraulique à une seule pompe pour un tracteur

Country Status (1)

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WO (1) WO2012014006A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952509A (en) * 1975-04-10 1976-04-27 Allis-Chalmers Corporation Hydraulic system combining open center and closed center hydraulic circuits
US4343151A (en) * 1980-05-16 1982-08-10 Caterpillar Tractor Co. Series - parallel selector for steering and implement
US4637482A (en) * 1985-03-29 1987-01-20 Kanzaki Kokyukoki Mfg. Co. Ltd. Hydraulic system in working vehicles
US6889634B1 (en) * 2004-04-16 2005-05-10 Borgwarner Inc. Method of providing hydraulic pressure for mechanical work from an engine lubricating system
US20080078285A1 (en) * 2006-09-28 2008-04-03 Volvo Construction Equipment Holding Sweden Ab Pressure control device for heavy equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952509A (en) * 1975-04-10 1976-04-27 Allis-Chalmers Corporation Hydraulic system combining open center and closed center hydraulic circuits
US4343151A (en) * 1980-05-16 1982-08-10 Caterpillar Tractor Co. Series - parallel selector for steering and implement
US4637482A (en) * 1985-03-29 1987-01-20 Kanzaki Kokyukoki Mfg. Co. Ltd. Hydraulic system in working vehicles
US6889634B1 (en) * 2004-04-16 2005-05-10 Borgwarner Inc. Method of providing hydraulic pressure for mechanical work from an engine lubricating system
US20080078285A1 (en) * 2006-09-28 2008-04-03 Volvo Construction Equipment Holding Sweden Ab Pressure control device for heavy equipment

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