EP0701067A2 - Système hydraulique - Google Patents

Système hydraulique Download PDF

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Publication number
EP0701067A2
EP0701067A2 EP95113513A EP95113513A EP0701067A2 EP 0701067 A2 EP0701067 A2 EP 0701067A2 EP 95113513 A EP95113513 A EP 95113513A EP 95113513 A EP95113513 A EP 95113513A EP 0701067 A2 EP0701067 A2 EP 0701067A2
Authority
EP
European Patent Office
Prior art keywords
valve
hydraulic system
hydraulic oil
hydraulic
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95113513A
Other languages
German (de)
English (en)
Other versions
EP0701067A3 (fr
Inventor
Heiko Gropp
Jürgen Dalmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Same SpA
Original Assignee
Same SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Same SpA filed Critical Same SpA
Publication of EP0701067A2 publication Critical patent/EP0701067A2/fr
Publication of EP0701067A3 publication Critical patent/EP0701067A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/045—Compensating for variations in viscosity or temperature

Definitions

  • the invention relates to a hydraulic system of an agricultural or construction vehicle according to the preamble of claim 1.
  • a hydraulic system is shown to control a working cylinder, for example for illustration of a simple tractor power lift.
  • the hydraulic system shown has a container with hydraulic oil, with at least one working cylinder being connected to the container via an inlet line with the interposition of a filter, a pump and a distribution device (directional valve) and a return line being arranged between the distribution device and the container.
  • a hydraulic system has proven itself in practice, but problems have arisen at low outside temperatures.
  • the object of the invention is therefore to avoid the disadvantages mentioned and to improve the efficiency of the hydraulic system, in particular at low ambient temperatures.
  • a valve is arranged between the feed line and the return line, which is opened in a further embodiment of the invention below a predetermined temperature and closed at temperatures above it.
  • a valve has the advantage that the pump for the hydraulic oil can suck it directly from the oil circuit and thus bypassing the filter, which is an undesirable throttle point at low temperatures due to the high viscosity of the hydraulic oil.
  • the hydraulic system of the vehicle can be operated immediately when the vehicle is started up, even at low temperatures at which the hydraulic oil has a high viscosity. If the operation of the vehicle and the hydraulic system gradually heats up the hydraulic oil so that a predeterminable temperature is exceeded, the valve closes (continuously or discreetly) so that the hydraulic oil is then sucked out of the container through the filter by the pump.
  • the outlet of the valve is arranged between the container and the pump.
  • the arrangement and the presence of the valve also ensure that, in particular, the pump is always supplied with hydraulic oil both at low and at higher temperatures, so that the risk of the pump running dry is effectively avoided.
  • the predeterminable temperature is selected as a function of the throughput line of the filter and / or as a function of the viscosity of the hydraulic oil.
  • the valve is spring-loaded, the spring-loaded being temperature-dependent. This provides a structural design of the valve, the material of the spring being selected as a function of the temperature.
  • the hydraulic system is particularly used in agricultural vehicles such as tractors, combine harvesters or other harvesting machines, in which working cylinders of all kinds are moved to move components of the vehicle or the harvesting machine.
  • the arrangement of the valve according to the invention can be used in the power lift or a hydraulic steering system or in a hydraulic oil circuit for attached machines.
  • combine harvesters and other harvesting machines it is used, for example, in working cylinders that raise and lower a cutting unit, in a hydrostatic drive of the vehicle or in the hydrostatic or hydraulic drive of individual components of the harvesting machine.
  • a hydraulic system 1 of an agricultural or construction vehicle has a container 2 for hydraulic oil.
  • This container 2 can, for example, also be designed as a tank and have a vent.
  • a pump 3 which has a drive 4 draws in hydraulic oil, which is conveyed to a hydraulic cylinder 6 by a distribution device 5 (directional valve).
  • the hydraulic oil is sucked out of the container 2 via a filter 7, which absorbs dirt particles in the hydraulic oil.
  • the pump 3 is connected to the container 2 via a feed line 8, while a return line 9 leads from the distribution device 5 back into the container 2.
  • a valve 10 is arranged between the return line 9 and the supply line 8, this valve 10 acting in such a way that at low temperatures (below a predeterminable temperature value) the pump 3 hydraulic oil via the return line 9 from the hydraulic oil circuit or from the container 2 can suck in, so that the hydraulic oil circuit can be maintained even at low temperatures. If the hydraulic oil warms up during operation (ie that a predeterminable temperature value is exceeded), the valve 10 closes continuously or discreetly, so that hydraulic oil flows back into the tank 2 via the return line 9, from which it then flows again via the filter 7 via the outflow Line 8 further hydraulic oil can be sucked in by the pump 3 and is conveyed to the distribution device 5 in order to supply the hydraulic cylinders 6 with hydraulic oil.
  • the design and mode of operation of the distribution device 5 as well as the number and design of the hydraulic cylinders 6 is of secondary importance and can be selected depending on the purpose and type of use of the hydraulic system 1.
  • the distribution device 5 is actuated as a function of environmental variables or variables of components of the vehicle or other influencing variables (for example, the influence of an operator of the vehicle on the hydraulic system). If the hydraulic system 1 is, for example, hydraulic steering of the vehicle, the directional control valve of the distributing device 5 can be influenced by the steering movements, a single double-acting hydraulic cylinder 6 being present.
  • the decisive factor is the arrangement of the distributor 10 according to the invention and its temperature-dependent mode of operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
EP95113513A 1994-09-08 1995-08-29 Système hydraulique Withdrawn EP0701067A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4431951A DE4431951A1 (de) 1994-09-08 1994-09-08 Hydraulikanlage
DE4431951 1994-09-08

Publications (2)

Publication Number Publication Date
EP0701067A2 true EP0701067A2 (fr) 1996-03-13
EP0701067A3 EP0701067A3 (fr) 1996-12-27

Family

ID=6527683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113513A Withdrawn EP0701067A3 (fr) 1994-09-08 1995-08-29 Système hydraulique

Country Status (2)

Country Link
EP (1) EP0701067A3 (fr)
DE (1) DE4431951A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627403A1 (de) * 1996-07-06 1998-01-08 Wabco Gmbh Druckgasanlage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431563A1 (de) * 1994-09-05 1996-03-07 Kloeckner Humboldt Deutz Ag Verschleißfeste Oberflächenpanzerung für die Walzen von Hochdruck-Walzenpressen zur Druckzerkleinerung körnigen Gutes (Unterlagen zu P 44 44 337.4 gegeben)
US6065386A (en) * 1996-01-30 2000-05-23 Mannesmann Rexroth Ag Hydraulic device for controlling a hydraulic-fluid flow

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1337112A (en) * 1970-05-28 1973-11-14 Rubery Owen & Co Ltd Vehicle hydraulic transmission systems
CS237612B1 (en) * 1983-01-31 1985-09-17 Ladislav Rach Wiring diagram for temperature regulation of working liquid
DE3633836C1 (de) * 1986-10-04 1988-03-31 Ford Werke Ag Temperaturkompensiertes Steuerventil,insbesondere Akkumulatorventil fuer hydraulische Steuerung von Kraftfahrzeuggetrieben
DE4021292A1 (de) * 1989-07-17 1991-01-31 Volkswagen Ag Filter
DE4041210C1 (en) * 1990-12-21 1992-05-07 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Hydraulic flow supply regulator e.g. for power-assisted steering - has changeover valve in second control line for auxiliary appts. controlled by temp. of main line
DE4135016A1 (de) * 1991-10-23 1993-04-29 Linde Ag Verfahren zum aufwaermen des druckmittels in einem hydraulischen kreislauf und vorrichtung dafuer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KARL-THEODOR RENIUS: "Traktoren - Technik und ihre Anwendung", ISBN: 3-405-13146-4, pages: 157

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627403A1 (de) * 1996-07-06 1998-01-08 Wabco Gmbh Druckgasanlage

Also Published As

Publication number Publication date
EP0701067A3 (fr) 1996-12-27
DE4431951A1 (de) 1996-03-14

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