WO2023118756A1 - Improved hydraulic architecture for coupling a secondary hydraulic circuit - Google Patents

Improved hydraulic architecture for coupling a secondary hydraulic circuit Download PDF

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Publication number
WO2023118756A1
WO2023118756A1 PCT/FR2022/052473 FR2022052473W WO2023118756A1 WO 2023118756 A1 WO2023118756 A1 WO 2023118756A1 FR 2022052473 W FR2022052473 W FR 2022052473W WO 2023118756 A1 WO2023118756 A1 WO 2023118756A1
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WIPO (PCT)
Prior art keywords
hydraulic
valve
circuit
connector
hydraulic circuit
Prior art date
Application number
PCT/FR2022/052473
Other languages
French (fr)
Inventor
Johan FEREY
Julien CAMINADE
Antoine Desmyttere
Original Assignee
Poclain Hydraulics Industrie
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Publication of WO2023118756A1 publication Critical patent/WO2023118756A1/en

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • F15B2011/0243—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits the regenerative circuit being activated or deactivated automatically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F15B2211/328—Directional control characterised by the type of actuation electrically or electronically with signal modulation, e.g. pulse width modulation [PWM]
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6057—Load sensing circuits having valve means between output member and the load sensing circuit using directional control valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F15B2211/613—Feeding circuits
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Definitions

  • This presentation relates to secondary hydraulic circuits for a vehicle or machine such as a tractor, typically a hydraulic circuit of a hitch or a carried and driven tool.
  • Some vehicles and machines are equipped with hydraulic connectors adapted to supply one or more independent hydraulic circuits on a mounted, semi-mounted or trailed hitch.
  • hitch is generally meant equipment associated with the vehicle or machine, for example a trailer, a carried or driven tool.
  • This architecture can be, for example, trenchers, mounted augers, wood splitters, forestry winches, semi-mounted plows and tillage devices, or towed spreaders, or even trailed sprayers when this connector is plugged directly behind the tractor's hydraulic pump, without priority valve between the pump and the connector, supplemented by an oil return connector and a load signal connector, this architecture is commonly referred to by the English term "Power Beyond”.
  • This "Power Beyond” architecture makes it possible to exploit the maximum hydraulic power with fewer pressure drops, and not to integrate flow limitation as may be the case with auxiliary distributors.
  • the hydraulic circuits associated with such a “Power Beyond” architecture are typically dimensioned for a pressure of the order of 200 bar, and of limited power. For hydraulic systems requiring high power, such a system is generally unsuitable, and then typically a dedicated hydraulic pump is placed on a power take-off, this hydraulic pump supplying a hydraulic system on board a hitch such as a trailer.
  • a recurring problem in such "Power Beyond” architectures is that the hydraulic connectors ensuring the "Power Beyond” connection between the primary hydraulic circuit of the machine and the secondary hydraulic circuit of the hitch deliver the flow directly from a hydraulic pump of the primary hydraulic circuit.
  • the secondary hydraulic circuit can consume a large or even very large quantity of the flow supplied by the hydraulic pump.
  • this hydraulic pump of the primary hydraulic circuit must also ensure the supply of a plurality of components, in particular the auxiliary and priority circuits of the vehicle or of the machine. It is understood that there is then a risk of disturbance of the hydraulic functions of the vehicle or of the machine if the hydraulic circuits of the vehicle or of the machine are not sufficiently supplied, the hydraulic power coming from the vehicle or of the machine being limited.
  • the present invention thus aims to respond at least partially to these problems.
  • a vehicle comprising a primary hydraulic circuit, comprising a load-dependent hydraulic pump, an auxiliary hydraulic circuit supplied by the hydraulic pump, and a hydraulic port comprising a hydraulic connector supplied by the hydraulic pump,
  • a hitch comprising a secondary hydraulic circuit, adapted to be connected to the hydraulic port so as to be supplied by the hydraulic pump via the hydraulic connector, said secondary hydraulic circuit comprising hydraulic components adapted to be supplied via the hydraulic connector; characterized in that the secondary hydraulic circuit comprises a sequence valve, positioned upstream of the hydraulic components, said sequence valve being configured so as to be conductive when the pressure at the hydraulic connector is greater than or equal to a threshold value, and not conductive when the pressure at the hydraulic connector is lower than said threshold value.
  • the sequence valve is configured so as to define the pressure threshold value below which the hydraulic components of the secondary hydraulic circuit are not supplied by the hydraulic pump via the hydraulic connector.
  • the sequence valve is configured so as to define a minimum pressure of between 100 and 150 bar at the hydraulic connector before supplying the hydraulic components of the secondary hydraulic circuit.
  • the sequence valve is a calibrated valve.
  • the secondary hydraulic circuit comprises a solenoid valve connected to the hydraulic connector, said solenoid valve being positioned between the hydraulic connector and the sequence valve, in particular so as to be able to take pressure between the hydraulic connector and the sequence valve , and being configured so as to selectively control the displacement of the hydraulic pump through the vehicle hydraulic connector dedicated to the load signal.
  • the secondary hydraulic circuit comprises a booster valve adapted to perform boosting of the secondary circuit, the booster valve being positioned upstream of the sequence valve with respect to the hydraulic connector, typically in a hydraulic pipe located between the hydraulic connector and the sequence valve.
  • the hydraulic components of the secondary hydraulic circuit comprise at least one hydraulic motor.
  • the hydraulic components comprise at least one hydraulic motor, the secondary hydraulic circuit comprising a freewheel valve positioned upstream of a supply valve for the hydraulic components and a non-return valve connected to the release valve. booster so that said at least one hydraulic motor can rotate freely via the freewheel valve, and the hydraulic motor having a supply and a discharge maintained at a booster pressure via the non-return valve and the booster valve when the sequence valve is closed.
  • the hydraulic components comprise at least one hydraulic motor, the secondary hydraulic circuit comprising a non-return valve positioned bypassing the sequence valve, so that the fluid in the secondary hydraulic circuit can circulate in a first direction via the sequence valve, and in a second direction opposite to the first direction via the non-return valve, so as to allow said at least one hydraulic motor to be driven in two opposite directions of rotation.
  • the solenoid valve is configured so as to be in a non-conductive configuration when the fluid flows in the second direction in the secondary hydraulic circuit.
  • the vehicle is a tractor.
  • the secondary hydraulic circuit is a hydraulic assistance circuit, comprising one or more hydraulic motors adapted to selectively drive in rotation one or more displacement members of the hitch.
  • Figure 1 schematically represents a system according to one aspect of the invention.
  • FIG. 2 Figure 2 schematically shows an application of the system of Figure 1 for a coupling provided with hydraulic assistance.
  • Figure 1 schematically shows an example of a system according to one aspect of the invention.
  • 0n represents in this figure an assembly comprising a primary hydraulic circuit 100 and a secondary hydraulic circuit 200.
  • the primary hydraulic circuit 100 is a hydraulic circuit of a vehicle or a machine, for example a tractor.
  • This primary hydraulic circuit 100 comprises a hydraulic pump 110 with variable displacement and load-dependent, driven by a motor M.
  • the hydraulic pump 110 draws a fluid from a reservoir R, and delivers a flow rate. Its displacement is controlled via a displacement control 115, associated with a displacement control circuit 117.
  • the primary hydraulic circuit 100 comprises an auxiliary hydraulic circuit 130, which typically comprises a plurality of hydraulic components of the vehicle or machine adapted to be supplied by the hydraulic pump 110.
  • the hydraulic pump 110 of the primary hydraulic circuit 100 is connected to a hydraulic connector 140.
  • the hydraulic connector 140 is connected directly to the hydraulic pump 110, and can thus deliver a flow rate corresponding to the flow delivered by the hydraulic pump 110.
  • this architecture is commonly referred to by the term in English “Power Beyond”.
  • directly connected it is understood here that the hydraulic pump 110 is connected to the hydraulic connector 140, excluding the presence of flow control members between the hydraulic pump 110 and the hydraulic connector 140.
  • the hydraulic connector 140 is also associated to a return connector 142 connected to the reservoir R, and to a control connector 144 connected to the displacement control circuit 117, the control connector 144 making it possible to deliver a load signal. All of these three connectors 140, 142 and 144 thus define a hydraulic port, making it possible to connect the primary hydraulic circuit 100 to a secondary hydraulic circuit 200.
  • the load signal is used for controlling the displacement of the pump, typically if it is of the open-loop type with pressure-regulated variable displacement, designated by the Anglo-Saxon term "open-loop load-sensing pump” or "load-sensing” pump.
  • the displacement control of a hydraulic pump of the “load sensing” type uses a line for a load signal which defines a pressure to be reached.
  • the hydraulic pump In the absence of a load signal, the hydraulic pump remains on standby pressure. In the presence of a load signal, the hydraulic pump displacement will regulate to increase the pressure and can increase up to the maximum pressure expected. Typically if there is a load signal, the hydraulic pump displacement will increase.
  • Additional lines can be provided on a “Power Beyond” port, for example a fourth line for drains.
  • the secondary hydraulic circuit 200 corresponds to a hydraulic circuit of a coupling for the vehicle or machine, typically a tool or a trailer for a tractor.
  • a portion of the secondary hydraulic circuit 200 comprising one or more hydraulic components is generally denoted by the reference 220.
  • Said hydraulic components 220 typically comprise one or more hydraulic motors which may be of fixed or variable displacement, as well as control elements such as valves.
  • the hydraulic components 220 of the secondary hydraulic circuit 200 are supplied by the hydraulic pump 110 via the hydraulic connector 140.
  • the secondary hydraulic circuit 200 thus comprises connectors adapted to be associated respectively with the hydraulic connector 140, with the return connector 142 and to the control connector 144, namely a secondary hydraulic connector 240, a secondary return connector 242 and a secondary control connector 244.
  • the hydraulic line connected to the secondary return connector 242 is provided with a calibrated check valve 205, in order to to ensure a direction of circulation of the fluid towards the reservoir R, and to maintain a minimum pressure equal to the calibration of the non-return valve calibrated 205 in the low pressure line of the secondary hydraulic circuit, for example 15 bar.
  • the hydraulic pump 110 can thus supply the secondary hydraulic circuit 200 via the hydraulic connector 140 and the secondary hydraulic connector 240.
  • the return to the reservoir R takes place via the secondary return connector 242 and the return connector 142.
  • the secondary hydraulic connector 240 thus defines the high pressure or supply line of the secondary hydraulic circuit 200, and the secondary return connector 242 defines the low pressure or return line of the secondary hydraulic circuit 200.
  • the control connector 144 and the secondary control connector 244 are connected to the displacement control circuit 117 via a pressure selector 105, adapted to carry out the displacement control of the hydraulic pump 110 via the highest pressure among a pilot pressure taken from the auxiliary hydraulic circuit 130 and the secondary hydraulic circuit 200.
  • the secondary pilot connector 244 is supplied via a pilot valve 210.
  • the pilot valve 210 is adapted to selectively take the pressure at the level of the secondary hydraulic connector 240 and apply it to the connector. secondary steering 244.
  • the pilot valve 210 is a solenoid valve controlled by an electric control 212 opposed by a return means 214 such as a spring.
  • the pilot valve 210 is configured to be open or no, depending on whether the electric control 212 is activated or not.
  • the pilot valve 210 is connected to the secondary pilot connector 244 via a non-return valve 216.
  • the pilot valve 210 is positioned directly at the level of the secondary hydraulic connector 240.
  • the pilot pressure which is taken off is not disturbed by the pressure drops which are then caused by the secondary hydraulic circuit 200, which therefore makes it possible to improve the displacement control of the hydraulic pump 110.
  • the secondary hydraulic circuit 200 includes a sequence valve 250.
  • the sequence valve 250 is interposed between the secondary hydraulic connector 240 and the hydraulic components 220 of the secondary hydraulic circuit 200.
  • the sequence valve 250 is configured so as to be conductive only when the pressure at the level of the hydraulic connector secondary 240 exceeds a predetermined threshold value, for example between 100 and 150 bar, or typically equal to 120 bar.
  • the sequence valve 250 can in particular take the form of a calibrated valve.
  • the sequence valve 250 thus makes it possible to ensure a minimum pressure at the level of the secondary hydraulic connector 240 (and therefore of the hydraulic connector 140) before supplying the hydraulic components 220 of the secondary hydraulic circuit 200.
  • the valve of sequence makes it possible to ensure a minimum pressure equal to the threshold value thus defined, which is delivered to the auxiliary hydraulic circuit 130.
  • ensuring a pressure at least equal to said threshold value to the auxiliary hydraulic circuit 130 makes it possible to ensure the proper functioning of the systems auxiliary hydraulics of the vehicle or the machine, and therefore makes it possible to respond to the problems linked to the system of the "power beyond" type, namely a risk of over-consumption of flow by the coupling and therefore a risk of disturbance of the hydraulic systems of the vehicle or machine, the latter then not being sufficiently supplied.
  • the sequence valve 250 as illustrated is mounted in parallel with a non-return valve 255, allowing a return of fluid in particular for a reverse operation.
  • This non-return valve 255 can thus be qualified as a free wheel valve.
  • the secondary hydraulic circuit 200 as proposed comprises a boost valve 230, positioned so as to allow pressure boosting of the low pressure pipe by the high pressure pipe of the secondary hydraulic circuit 200.
  • the boost valve here is a calibrated valve, for example with a calibration equal to 13 bar, and coupled to a non-return valve 235 in order to ensure fluid circulation only in the direction of the high pressure pipe towards the low pressure pipe.
  • the booster valve 230 typically has a calibration at a value less than or equal to, or typically slightly lower than the calibration value of the calibrated non-return valve 205.
  • the non-return valve 235 is typically calibrated, with a calibration at a value lower than the calibration of the booster valve 230, and at a value greater than the calibration of the calibrated non-return valve 205.
  • the non-return valve 235 makes it possible to protect the booster valve 230 against a rise in pressure coming from the low pressure pipe, which could disturb the calibration of the booster valve 230.
  • the boosting of a hydraulic circuit essentially makes it possible to avoid any lack of oil in the circuit, especially if the latter includes hydraulic motors, so that cavitation never occurs which can damage or even damage the components. hydraulics. This amounts to always ensuring a minimum positive pressure at the terminals of components, in particular hydraulic motors, typically of the order of 10 to 20 bar.
  • the boost valve 230 is positioned upstream of the sequence valve 250 with respect to the secondary hydraulic connector 240, which thus makes it possible to ensure boosting of the secondary hydraulic circuit 200 even if the valve of sequence 250 is not busy, and thus in particular to carry out a boost before the supply of the secondary hydraulic circuit 200.
  • the boost pressure thus established allows the secondary circuit 200 to operate in freewheel mode under this boost pressure, while the boost pressure Power supply is isolated by sequence valve 250.
  • the booster valve 230 also makes it possible to sample a pilot pressure, which is typically used for piloting elements of the secondary hydraulic circuit 200, in particular valves associated with the hydraulic components 220.
  • This positioning of the booster valve 230 in the secondary hydraulic circuit 200 also makes it possible to draw off a pilot pressure which is thus effective as soon as pressure is delivered to the secondary hydraulic connector 240, even if the sequence valve 250 is not through.
  • the architecture of the system as proposed thus makes it possible to establish a priority on the various hydraulic components of the system. In particular, it makes it possible to ensure sufficient supply to the various hydraulic systems of the vehicle or machine before supplying the coupling systems.
  • FIG. 2 thus schematically shows the application of the system for a hitch equipped with hydraulic assistance.
  • hydraulic assistance is meant here a driving of the wheels of a vehicle or of a machine which can engage or disengage to help motor skills temporarily.
  • the same circuit can be used for any hydraulic consumer, such as a drive, for which freewheel operation is desired when the sequence valve closes.
  • the hydraulic components 220 here comprise two hydraulic motors 282 and 284 mounted in parallel adapted to drive in rotation displacement components such as wheels or axles of the coupling. It is understood that this embodiment is not limiting, and that the system can be applied to any number of engines hydraulics which can for example be connected in parallel, in series, or according to any other suitable configuration.
  • the hydraulic motors 282 and 284 are here supplied via a supply valve 260 itself associated with a pilot valve 270.
  • the pilot valve 270 is a solenoid valve adapted to pilot the supply valve 260. It is connected to the reservoir R and draws pilot pressure via a tapping between the booster valve 230 and the non-return valve 235. This pilot pressure makes it possible to actuate the hydraulic controls of the supply valve 260, and also to pressurize the hydraulic pipes linked to the hydraulic motors 282 and 284 prior to their commissioning.
  • the pilot valve 270 and the supply valve 260 thus cooperate to define a coasting configuration in which the hydraulic motors 282 and 284 are at ambient pressure and are disengaged from the wheels, a displacement configuration in which the pressure of piloting is applied to the hydraulic motors 282 and 284, in which the motors are engaged on the wheels but in equal pressure, and an engaged configuration in which the hydraulic motors 282 and 284 are supplied by the hydraulic pump 110 by the booster valve 230, under provided that sequence valve 250 is closed.
  • the center position can be used to engage the hydraulic motors at reduced pressure, before switching to final engagement.
  • the pilot valve 270 is typically a three-position valve, with a central neutral position, which defines from left to right in FIG. 2: a position for connection with forced bypass of the hydraulic motors 282 and 284 to the force-feeding a neutral position which forces the non-connection of the hydraulic motors 282 and 284, and a connected position wherein the hydraulic motors 282 and 284 are powered via the secondary hydraulic connector 240.
  • the hydraulic motors 282 and 284 are typically motors of the disengageable type, for example with engagement on the axis of the wheels by a clutch or dog clutch, or of the type with radial pistons and multilobe cam with disengagement by retraction of the pistons in the cylinder block. Such hydraulic motors can disengage automatically if the supply pressure is below a certain threshold. In this way the hitch can be driven effortlessly when the motors are disengaged.
  • the circuit shown corresponds to the case where the engines are of the radial piston and multilobe cam type with disengagement by retraction of the pistons in the cylinder block.
  • the operation of the supply valve automatically causes the retraction or the extension of the pistons to achieve the disengagement or the engagement of the motors.
  • a freewheel valve 300 of the motors is placed between the suction and discharge lines of the hydraulic motors 282 and 284 upstream of the supply valve 260.
  • This freewheel valve 300 allows freewheeling operation hydraulic motors 282 and 284 when sequence valve 250 is closed, and supply valve 260 is in the engaged position.
  • the freewheel valve 300 allows the freewheeling operation of the hydraulic motors 282 and 284, and therefore not to block or cause the hydraulic motors 282 and 284 to cavitate when the sequence valve isolates the hydraulic motors 282 and 284 from the discharge of the hydraulic pump 110.
  • one of the suction or discharge lines of the secondary hydraulic circuit 200 is placed at the booster pressure thanks to the non-return valve 235. More particularly in FIG. 2, the discharge line of the hydraulic motors 282 and 284 is connected to the non-return valve 235 and therefore to the booster valve 230, which guarantees a minimum of pressure during bypass operation (or bypass) of hydraulic motors 282 and 284. In this wheel operation free, the supply and discharge lines of the motors 282 and 284 are substantially at the pressure set by the booster valve 235, except for pressure drops.
  • the freewheel valve 255 also allows rotation in the opposite direction of the hydraulic motors, for example in the case where the hitch is driven in reverse.
  • the hydraulic motors 282 and 284 then operate as a pump, and provide a flow which passes through the supply valve 260, then through the freewheel valve 255 and upstream of the booster valve 230 to join the line coming from the hydraulic pump 110.
  • the pressure of the hydraulic line is defined by the pressure of the hydraulic pump 110.
  • the discharge line of the hydraulic motors 282 and 284 is therefore at this instant at the pressure of the hydraulic pump 110.
  • the flow coming from the hydraulic motors is in the opposite direction with respect to the flow of the hydraulic pump 110, that is to say that the movement of the hydraulic motors opposes the thrust of the hydraulic pump 110.
  • Non-return valve 235 is typically at substantially zero calibration. It may optionally be provided with a weak pre-positioning spring for its stability, for example calibrated at 1 Bar.
  • the booster valve 230 is typically calibrated at 13 bar and operates as a pressure reducer and reacts to the downstream pressure.
  • the line downstream of the booster valve 230 is therefore regulated at 13 bar.
  • the calibrated valve 205 is typically calibrated at a value slightly higher than that of the booster valve 230, typically 15 bar, and in this case must remain closed.
  • the suction line of the hydraulic motors is therefore substantially maintained at the boost pressure, typically between 13 and 15 bar.
  • the freewheel valve 255 When used in reverse, in the case where the supply valve 260 is actuated, the freewheel valve 255 provides protection by allowing reverse flow.
  • the pilot valve 210 is typically controlled so as to be in its non-passing configuration, which thus minimizes the displacement setpoint applied to the hydraulic pump 110, for example so that 'it delivers a pressure of around 20 bar and not a maximum pressure which can for example be around 200, 250 or 350 bar depending on the hydraulic pump and the machine.
  • This piloting makes it possible to minimize the counterthrust of the hydraulic motors 282 and 284 during reverse travel. This use makes it possible to carry out quick reverses without changing the positioning of the supply valve 260 under good conditions.
  • the hydraulic circuit described is typically dedicated to a hydraulic pump for an open-loop circuit, according to the English name "open-loop".
  • This circuit only works in one direction, which is for example the direction of travel of a vehicle or of a machine.
  • a two-position reversing valve can then be added between the motors and the supply valve. , without the rest of the hydraulic circuit being modified.
  • the system as proposed thus makes it possible in particular to use hydraulic systems having a potentially high consumption of flow, for example temporary hydraulic assistance for driving the wheels of the coupling.
  • the invention as proposed, and in particular the integration of the sequence valve 250, makes it possible to respond to these problems.

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Abstract

Disclosed is an assembly comprising: - a vehicle comprising a primary hydraulic circuit (100), comprising a load-sensing hydraulic pump (110), an auxiliary hydraulic circuit (130) fed by the hydraulic pump (110) and a hydraulic connector (140) fed by the hydraulic pump (110); - a coupling unit comprising a secondary hydraulic circuit (200) suitable for being connected to the hydraulic connector (140), the secondary hydraulic circuit (200) comprising hydraulic members (220) that are suitable for being fed via the hydraulic connector (140); characterised in that the secondary hydraulic circuit (200) comprises a sequence valve (250) positioned upstream of the hydraulic members (220), the sequence valve (250) being configured so as to be open when the pressure to the hydraulic connector (140) is higher than or equal to a threshold value and closed when the pressure to the hydraulic connector (140) is lower than the threshold value.

Description

ARCHITECTURE HYDRAULIQUE AMELIOREE POUR COUPLAGE D'UN CIRCUIT HYDRAULIQUE SECONDAIRE IMPROVED HYDRAULIC ARCHITECTURE FOR COUPLING A SECONDARY HYDRAULIC CIRCUIT
Description Description
Domaine Technique Technical area
[0001] Le présent exposé concerne les circuits hydrauliques secondaires pour un véhicule ou un engin tel qu'un tracteur, typiquement un circuit hydraulique d'un attelage ou d'un outil porté et entraîné. This presentation relates to secondary hydraulic circuits for a vehicle or machine such as a tractor, typically a hydraulic circuit of a hitch or a carried and driven tool.
Technique antérieure Prior technique
[0002] Certains véhicules et engins, notamment les tracteurs, sont équipés de connecteurs hydrauliques adaptés pour alimenter un ou plusieurs circuits hydrauliques indépendants sur un attelage porté, semi-porté ou traîné. Par attelage, on désigne de manière générale un équipement associé au véhicule ou à l'engin, par exemple une remorque, un outil porté ou entraîné. Ainsi, en venant connecter un circuit hydraulique indépendant au circuit hydraulique du véhicule ou de l'engin. Ce peuvent être par exemple des trancheuses, des tarières portées, des fendeuses à bois, des treuils forestiers, des charrues et appareils animés de travail du sol semi-portées, ou épandeurs remorqués, ou encore des pulvérisateurs traînés lorsque ce connecteur est directement branché derrière la pompe hydraulique du tracteur, sans valve de priorité entre la pompe et le connecteur, complété par un connecteur de retour d'huile et un connecteur de signal de charge, cette architecture est communément désignée par le terme en langue anglaise « Power Beyond » . Cette architecture « Power Beyond » permet d'exploiter le maximum de puissance hydraulique en opposant moins de pertes de charge, et de ne pas intégrer de limitation de débit comme ce peut être le cas avec des distributeurs auxiliaires. Les circuits hydrauliques associés à une telle architecture « Power Beyond » sont typiquement dimensionnés pour une pression de l'ordre de 200 bar, et de puissance limitée. Pour des systèmes hydrauliques nécessitant une forte puissance, un tel système est généralement peu adapté, et on place alors typiquement une pompe hydraulique dédiée sur une prise de force, cette pompe hydraulique venant alimenter un système hydraulique embarqué sur un attelage tel qu'une remorque. [0002] Some vehicles and machines, in particular tractors, are equipped with hydraulic connectors adapted to supply one or more independent hydraulic circuits on a mounted, semi-mounted or trailed hitch. By hitch is generally meant equipment associated with the vehicle or machine, for example a trailer, a carried or driven tool. Thus, by connecting an independent hydraulic circuit to the hydraulic circuit of the vehicle or machine. These can be, for example, trenchers, mounted augers, wood splitters, forestry winches, semi-mounted plows and tillage devices, or towed spreaders, or even trailed sprayers when this connector is plugged directly behind the tractor's hydraulic pump, without priority valve between the pump and the connector, supplemented by an oil return connector and a load signal connector, this architecture is commonly referred to by the English term "Power Beyond". This "Power Beyond" architecture makes it possible to exploit the maximum hydraulic power with fewer pressure drops, and not to integrate flow limitation as may be the case with auxiliary distributors. The hydraulic circuits associated with such a “Power Beyond” architecture are typically dimensioned for a pressure of the order of 200 bar, and of limited power. For hydraulic systems requiring high power, such a system is generally unsuitable, and then typically a dedicated hydraulic pump is placed on a power take-off, this hydraulic pump supplying a hydraulic system on board a hitch such as a trailer.
[0003] Une problématique récurrente dans de telles architectures « Power Beyond » est que les connecteurs hydrauliques assurant la liaison « Power Beyond » entre le circuit hydraulique primaire de l'engin et le circuit hydraulique secondaire de l'attelage délivrent le débit directement issu d'une pompe hydraulique du circuit hydraulique primaire. Ainsi, le circuit hydraulique secondaire peut consommer une quantité importante voire très importante du débit fourni par la pompe hydraulique. Or, cette pompe hydraulique du circuit hydraulique primaire doit également assurer l'alimentation d'une pluralité de composants, notamment des circuits auxiliaires et prioritaires du véhicule ou de l'engin. On comprend qu'il y a alors un risque de perturbation des fonctions hydrauliques du véhicule ou de l'engin si les circuits hydrauliques du véhicule ou de l'engin ne sont pas suffisamment alimentés, la puissance hydraulique venant du véhicule ou de l'engin étant limitée. [0003] A recurring problem in such "Power Beyond" architectures is that the hydraulic connectors ensuring the "Power Beyond" connection between the primary hydraulic circuit of the machine and the secondary hydraulic circuit of the hitch deliver the flow directly from a hydraulic pump of the primary hydraulic circuit. Thus, the secondary hydraulic circuit can consume a large or even very large quantity of the flow supplied by the hydraulic pump. However, this hydraulic pump of the primary hydraulic circuit must also ensure the supply of a plurality of components, in particular the auxiliary and priority circuits of the vehicle or of the machine. It is understood that there is then a risk of disturbance of the hydraulic functions of the vehicle or of the machine if the hydraulic circuits of the vehicle or of the machine are not sufficiently supplied, the hydraulic power coming from the vehicle or of the machine being limited.
[0004] Par exemple en cas de survitesse par rapport à la capacité d'alimentation de la pompe, ou à vitesse égale mais en cas de manque d'alimentation temporaire venant de la pompe du tracteur, par exemple si le régime du moteur du tracteur diminue car on change de rapport de transmission du tracteur, ou car un consommateur hydraulique du tracteur augmente sa consommation, il peut y avoir un manque d'alimentation. [0004] For example in the event of overspeed compared to the supply capacity of the pump, or at equal speed but in the event of a temporary lack of supply from the tractor pump, for example if the speed of the tractor engine decreases because the transmission ratio of the tractor is changed, or because a hydraulic consumer of the tractor increases its consumption, there may be a lack of supply.
[0005] De plus, en cas de consommation excessive de fluide, il peut se produire aussi une perturbation des fonctions hydrauliques annexes du circuit connecté sur le port « Power Beyond », notamment la direction assistée, le freinage ou les organes de relevage. [0005] In addition, in the event of excessive fluid consumption, there may also be a disturbance of the auxiliary hydraulic functions of the circuit connected to the “Power Beyond” port, in particular the power steering, the braking or the lifting devices.
[0006] La présente invention vise ainsi à répondre au moins partiellement à ces problématiques. [0006] The present invention thus aims to respond at least partially to these problems.
Exposé de l'invention [0007] La présente invention concerne ainsi un ensemble comprenant : Disclosure of Invention The present invention thus relates to an assembly comprising:
- un véhicule comprenant un circuit hydraulique primaire, comprenant une pompe hydraulique asservie en charge, un circuit hydraulique auxiliaire alimenté par la pompe hydraulique, et un port hydraulique comprenant un connecteur hydraulique alimenté par la pompe hydraulique, - a vehicle comprising a primary hydraulic circuit, comprising a load-dependent hydraulic pump, an auxiliary hydraulic circuit supplied by the hydraulic pump, and a hydraulic port comprising a hydraulic connector supplied by the hydraulic pump,
- un attelage comprenant un circuit hydraulique secondaire, adapté pour être relié au port hydraulique de manière à être alimenté par la pompe hydraulique via le connecteur hydraulique, ledit circuit hydraulique secondaire comprenant des organes hydrauliques adaptés pour être alimentés via le connecteur hydraulique ; caractérisé en ce que le circuit hydraulique secondaire comprend une valve de séquence, positionnée en amont des organes hydrauliques, ladite valve de séquence étant configurée de manière à être passante lorsque la pression au connecteur hydraulique est supérieure ou égale à une valeur seuil, et non passante lorsque la pression au connecteur hydraulique est inférieure à ladite valeur seuil. - a hitch comprising a secondary hydraulic circuit, adapted to be connected to the hydraulic port so as to be supplied by the hydraulic pump via the hydraulic connector, said secondary hydraulic circuit comprising hydraulic components adapted to be supplied via the hydraulic connector; characterized in that the secondary hydraulic circuit comprises a sequence valve, positioned upstream of the hydraulic components, said sequence valve being configured so as to be conductive when the pressure at the hydraulic connector is greater than or equal to a threshold value, and not conductive when the pressure at the hydraulic connector is lower than said threshold value.
[0008]Selon un exemple, la valve de séquence est configurée de manière à définir la valeur seuil de pression en dessous de laquelle les organes hydrauliques du circuit hydraulique secondaire ne sont pas alimentés par la pompe hydraulique via le connecteur hydraulique. [0008]According to one example, the sequence valve is configured so as to define the pressure threshold value below which the hydraulic components of the secondary hydraulic circuit are not supplied by the hydraulic pump via the hydraulic connector.
[0009]Selon un exemple, la valve de séquence est configurée de manière à définir une pression minimale comprise entre 100 et 150 bar au connecteur hydraulique avant d'alimenter les organes hydrauliques du circuit hydraulique secondaire. [0009]According to one example, the sequence valve is configured so as to define a minimum pressure of between 100 and 150 bar at the hydraulic connector before supplying the hydraulic components of the secondary hydraulic circuit.
[0010]Selon un exemple, la valve de séquence est une soupape tarée. [0010]According to one example, the sequence valve is a calibrated valve.
[0011]Selon un exemple, le circuit hydraulique secondaire comprend une électrovanne reliée au connecteur hydraulique, ladite électrovanne étant positionnée entre le connecteur hydraulique et la valve de séquence, notamment de manière à pouvoir prélever une pression entre le connecteur hydraulique et la valve de séquence, et étant configurée de manière à sélectivement piloter la cylindrée de la pompe hydraulique au travers du connecteur hydraulique véhicule dédié au signal de charge. [0012]Selon un exemple, le circuit hydraulique secondaire comprend une valve de gavage adaptée pour réaliser un gavage du circuit secondaire, la valve de gavage étant positionnée en amont de la valve de séquence par rapport au connecteur hydraulique, typiquement dans une conduite hydraulique située entre le connecteur hydraulique et la valve de séquence. [0011] According to one example, the secondary hydraulic circuit comprises a solenoid valve connected to the hydraulic connector, said solenoid valve being positioned between the hydraulic connector and the sequence valve, in particular so as to be able to take pressure between the hydraulic connector and the sequence valve , and being configured so as to selectively control the displacement of the hydraulic pump through the vehicle hydraulic connector dedicated to the load signal. [0012]According to one example, the secondary hydraulic circuit comprises a booster valve adapted to perform boosting of the secondary circuit, the booster valve being positioned upstream of the sequence valve with respect to the hydraulic connector, typically in a hydraulic pipe located between the hydraulic connector and the sequence valve.
[0013]Selon un exemple, les organes hydrauliques du circuit hydraulique secondaire comprennent au moins un moteur hydraulique. [0013]According to one example, the hydraulic components of the secondary hydraulic circuit comprise at least one hydraulic motor.
[0014] Selon un exemple, les organes hydrauliques comprennent au moins un moteur hydraulique, le circuit hydraulique secondaire comprenant un clapet de roue libre positionné en amont d’une valve d’alimentation des organes hydrauliques et un clapet anti retour relié à la valve de gavage de sorte que ledit au moins un moteur hydraulique peut tourner en roue libre via le clapet de roue libre, et le moteur hydraulique présentant une alimentation et un refoulement maintenus à une pression de gavage via le clapet anti retour et la valve de gavage lorsque la valve de séquence est non passante. [0014]According to one example, the hydraulic components comprise at least one hydraulic motor, the secondary hydraulic circuit comprising a freewheel valve positioned upstream of a supply valve for the hydraulic components and a non-return valve connected to the release valve. booster so that said at least one hydraulic motor can rotate freely via the freewheel valve, and the hydraulic motor having a supply and a discharge maintained at a booster pressure via the non-return valve and the booster valve when the sequence valve is closed.
[0015] Selon un exemple, les organes hydrauliques comprennent au moins un moteur hydraulique, le circuit hydraulique secondaire comprenant un clapet anti retour positionné en contournement de la valve de séquence, de sorte que le fluide dans le circuit hydraulique secondaire peut circuler dans un premier sens via la valve de séquence, et dans un second sens inverse au premier sens via le clapet anti retour, de manière à permettre un entrainement dudit au moins un moteur hydraulique selon deux sens de rotation opposés.. [0015]According to one example, the hydraulic components comprise at least one hydraulic motor, the secondary hydraulic circuit comprising a non-return valve positioned bypassing the sequence valve, so that the fluid in the secondary hydraulic circuit can circulate in a first direction via the sequence valve, and in a second direction opposite to the first direction via the non-return valve, so as to allow said at least one hydraulic motor to be driven in two opposite directions of rotation.
[0016] Selon un exemple, l’électrovanne est configurée de manière à être dans une configuration non passante lorsque le fluide circule dans le second sens dans le circuit hydraulique secondaire. According to one example, the solenoid valve is configured so as to be in a non-conductive configuration when the fluid flows in the second direction in the secondary hydraulic circuit.
[0017] Selon un exemple, le véhicule est un tracteur. [0017] According to one example, the vehicle is a tractor.
[0018] Selon un exemple, le circuit hydraulique secondaire est un circuit d'assistance hydraulique, comprenant un ou plusieurs moteurs hydrauliques adaptés pour sélectivement entrainer en rotation un ou plusieurs organes de déplacement de l'attelage. Brève description des dessins [0018]According to one example, the secondary hydraulic circuit is a hydraulic assistance circuit, comprising one or more hydraulic motors adapted to selectively drive in rotation one or more displacement members of the hitch. Brief description of the drawings
[0019] L'invention et ses avantages seront mieux compris à la lecture de la description détaillée faite ci-après de différents modes de réalisation de l'invention donnés à titre d'exemples non limitatifs. The invention and its advantages will be better understood on reading the detailed description given below of various embodiments of the invention given by way of non-limiting examples.
[0020] [Fig. 1] La figure 1 représente schématiquement un système selon un aspect de l'invention. [0020] [Fig. 1] Figure 1 schematically represents a system according to one aspect of the invention.
[0021] [Fig. 2] La figure 2 représente schématiquement une application du système de la figure 1 pour un attelage muni d'une assistance hydraulique. [0021] [Fig. 2] Figure 2 schematically shows an application of the system of Figure 1 for a coupling provided with hydraulic assistance.
[0022] Sur l'ensemble des figures, les éléments en commun sont repérés par des références numériques identiques. In all of the figures, the elements in common are identified by identical reference numerals.
Description des modes de réalisation Description of embodiments
[0023] La figure 1 représente schématiquement un exemple de système selon un aspect de l'invention. Figure 1 schematically shows an example of a system according to one aspect of the invention.
[0024]0n représente sur cette figure un ensemble comprenant un circuit hydraulique primaire 100 et un circuit hydraulique secondaire 200. [0024] 0n represents in this figure an assembly comprising a primary hydraulic circuit 100 and a secondary hydraulic circuit 200.
[0025] Le circuit hydraulique primaire 100 est un circuit hydraulique d'un véhicule ou d'un engin, par exemple un tracteur. The primary hydraulic circuit 100 is a hydraulic circuit of a vehicle or a machine, for example a tractor.
[0026]Ce circuit hydraulique primaire 100 comprend une pompe hydraulique 110 à cylindrée variable et asservie en charge, entraînée par un moteur M. La pompe hydraulique 110 prélève un fluide dans un réservoir R, et délivre un débit. Sa cylindrée est pilotée via une commande de cylindrée 115, associée à un circuit de commande de cylindrée 117. This primary hydraulic circuit 100 comprises a hydraulic pump 110 with variable displacement and load-dependent, driven by a motor M. The hydraulic pump 110 draws a fluid from a reservoir R, and delivers a flow rate. Its displacement is controlled via a displacement control 115, associated with a displacement control circuit 117.
[0027] Le circuit hydraulique primaire 100 comprend un circuit hydraulique auxiliaire 130, qui comprend typiquement une pluralité d'organes hydrauliques du véhicule ou de l'engin adaptés pour être alimentés par la pompe hydraulique 110. La pompe hydraulique 110 du circuit hydraulique primaire 100 est reliée à un connecteur hydraulique 140. Le connecteur hydraulique 140 est relié directement à la pompe hydraulique 110, et peut ainsi délivrer un débit correspondant au débit délivré par la pompe hydraulique 110. Comme indiqué en introduction, cette architecture est communément désignée par le terme en langue anglaise « Power Beyond ». Par « relié directement », on comprend ici que la pompe hydraulique 110 est reliée au connecteur hydraulique 140, en excluant la présence d'organes de régulation du débit entre la pompe hydraulique 110 et le connecteur hydraulique 140. Le connecteur hydraulique 140 est également associé à un connecteur de retour 142 relié au réservoir R, et à un connecteur de pilotage 144 relié au circuit de commande de cylindrée 117, le connecteur de pilotage 144 permettant de délivrer un signal de charge. L'ensemble de ces trois connecteurs 140, 142 et 144 définit ainsi un port hydraulique, permettant de connecter le circuit hydraulique primaire 100 à un circuit hydraulique secondaire 200. Le signal de charge est utilisé pour le contrôle de cylindrée de la pompe, typiquement si elle est du type en boucle ouverte a cylindrée variable régulée en pression, désignée sous le terme anglo-saxon de « pompe open-loop load sensing » ou pompe « load sensing ». Le contrôle de cylindrée d'une pompe hydraulique du type « load sensing » utilise une ligne pour un signal de charge qui définit une pression à atteindre. En absence de signal de charge, la pompe hydraulique reste sur une pression d'attente. En présence d'un signal de charge, la cylindrée de pompe hydraulique va se réguler pour augmenter la pression et peut monter jusqu'à la pression maximale prévue. Typiquement s'il y a un signal de charge, la cylindrée de pompe hydraulique va augmenter. [0027] The primary hydraulic circuit 100 comprises an auxiliary hydraulic circuit 130, which typically comprises a plurality of hydraulic components of the vehicle or machine adapted to be supplied by the hydraulic pump 110. The hydraulic pump 110 of the primary hydraulic circuit 100 is connected to a hydraulic connector 140. The hydraulic connector 140 is connected directly to the hydraulic pump 110, and can thus deliver a flow rate corresponding to the flow delivered by the hydraulic pump 110. As indicated in the introduction, this architecture is commonly referred to by the term in English “Power Beyond”. By "directly connected", it is understood here that the hydraulic pump 110 is connected to the hydraulic connector 140, excluding the presence of flow control members between the hydraulic pump 110 and the hydraulic connector 140. The hydraulic connector 140 is also associated to a return connector 142 connected to the reservoir R, and to a control connector 144 connected to the displacement control circuit 117, the control connector 144 making it possible to deliver a load signal. All of these three connectors 140, 142 and 144 thus define a hydraulic port, making it possible to connect the primary hydraulic circuit 100 to a secondary hydraulic circuit 200. The load signal is used for controlling the displacement of the pump, typically if it is of the open-loop type with pressure-regulated variable displacement, designated by the Anglo-Saxon term "open-loop load-sensing pump" or "load-sensing" pump. The displacement control of a hydraulic pump of the “load sensing” type uses a line for a load signal which defines a pressure to be reached. In the absence of a load signal, the hydraulic pump remains on standby pressure. In the presence of a load signal, the hydraulic pump displacement will regulate to increase the pressure and can increase up to the maximum pressure expected. Typically if there is a load signal, the hydraulic pump displacement will increase.
[0028] Des lignes supplémentaires peuvent être prévues sur un port « Power Beyond », par exemple une quatrième ligne pour des drains. [0028] Additional lines can be provided on a “Power Beyond” port, for example a fourth line for drains.
[0029] Le circuit hydraulique secondaire 200 correspond à un circuit hydraulique d'un attelage pour le véhicule ou l'engin, typiquement un outillage ou une remorque pour un tracteur. On désigne ici généralement une portion du circuit hydraulique secondaire 200 comprenant un ou plusieurs organes hydrauliques par la référence 220. Lesdits organes hydrauliques 220 comprennent typiquement un ou plusieurs moteurs hydrauliques pouvant être à cylindrée fixe ou variable, ainsi que des éléments de pilotage tels que des valves. [0030] Les organes hydrauliques 220 du circuit hydraulique secondaire 200 sont alimentés par la pompe hydraulique 110 via le connecteur hydraulique 140. Le circuit hydraulique secondaire 200 comprend ainsi des connecteurs adaptés pour être associés respectivement au connecteur hydraulique 140, au connecteur de retour 142 et au connecteur de pilotage 144, à savoir un connecteur hydraulique secondaire 240, un connecteur de retour secondaire 242 et un connecteur de pilotage secondaire 244. La conduite hydraulique reliée au connecteur de retour secondaire 242 est munie d'un clapet anti retour taré 205, afin d'assurer un sens de circulation du fluide vers le réservoir R, et de maintenir une pression minimale égale au tarage du clapet anti retour taré 205 dans la ligne basse pression du circuit hydraulique secondaire, par exemple 15 bar. The secondary hydraulic circuit 200 corresponds to a hydraulic circuit of a coupling for the vehicle or machine, typically a tool or a trailer for a tractor. Here, a portion of the secondary hydraulic circuit 200 comprising one or more hydraulic components is generally denoted by the reference 220. Said hydraulic components 220 typically comprise one or more hydraulic motors which may be of fixed or variable displacement, as well as control elements such as valves. [0030] The hydraulic components 220 of the secondary hydraulic circuit 200 are supplied by the hydraulic pump 110 via the hydraulic connector 140. The secondary hydraulic circuit 200 thus comprises connectors adapted to be associated respectively with the hydraulic connector 140, with the return connector 142 and to the control connector 144, namely a secondary hydraulic connector 240, a secondary return connector 242 and a secondary control connector 244. The hydraulic line connected to the secondary return connector 242 is provided with a calibrated check valve 205, in order to to ensure a direction of circulation of the fluid towards the reservoir R, and to maintain a minimum pressure equal to the calibration of the non-return valve calibrated 205 in the low pressure line of the secondary hydraulic circuit, for example 15 bar.
[0031] En fonctionnement, la pompe hydraulique 110 peut ainsi alimenter le circuit hydraulique secondaire 200 via le connecteur hydraulique 140 et le connecteur hydraulique secondaire 240. Le retour au réservoir R s'effectue via le connecteur de retour secondaire 242 et le connecteur de retour 142. Le connecteur hydraulique secondaire 240 définit ainsi la ligne haute pression ou d'alimentation du circuit hydraulique secondaire 200, et le connecteur de retour secondaire 242 définit la ligne basse pression ou de retour du circuit hydraulique secondaire 200. In operation, the hydraulic pump 110 can thus supply the secondary hydraulic circuit 200 via the hydraulic connector 140 and the secondary hydraulic connector 240. The return to the reservoir R takes place via the secondary return connector 242 and the return connector 142. The secondary hydraulic connector 240 thus defines the high pressure or supply line of the secondary hydraulic circuit 200, and the secondary return connector 242 defines the low pressure or return line of the secondary hydraulic circuit 200.
[0032] Le connecteur de pilotage 144 et le connecteur de pilotage secondaire 244 sont reliés au circuit de commande de cylindrée 117 via un sélecteur de pression 105, adapté pour réaliser le pilotage en cylindrée de la pompe hydraulique 110 via la pression la plus élevée parmi une pression de pilotage prélevée sur le circuit hydraulique auxiliaire 130 et le circuit hydraulique secondaire 200. The control connector 144 and the secondary control connector 244 are connected to the displacement control circuit 117 via a pressure selector 105, adapted to carry out the displacement control of the hydraulic pump 110 via the highest pressure among a pilot pressure taken from the auxiliary hydraulic circuit 130 and the secondary hydraulic circuit 200.
[0033] Dans le mode de réalisation représenté, le connecteur de pilotage secondaire 244 est alimenté via une valve de pilotage 210. La valve de pilotage 210 est adaptée pour sélectivement prélever la pression au niveau du connecteur hydraulique secondaire 240 et l'appliquer au connecteur de pilotage secondaire 244. [0033] In the embodiment shown, the secondary pilot connector 244 is supplied via a pilot valve 210. The pilot valve 210 is adapted to selectively take the pressure at the level of the secondary hydraulic connector 240 and apply it to the connector. secondary steering 244.
[0034] Dans l'exemple illustré, la valve de pilotage 210 est une électrovanne pilotée par une commande électrique 212 à laquelle s'oppose un moyen de rappel 214 tel qu'un ressort. La valve de pilotage 210 est configurée pour être passante ou non, selon que la commande électrique 212 est activée ou non. Dans l'exemple illustré, la valve de pilotage 210 est reliée au connecteur de pilotage secondaire 244 via un clapet anti retour 216. In the example shown, the pilot valve 210 is a solenoid valve controlled by an electric control 212 opposed by a return means 214 such as a spring. The pilot valve 210 is configured to be open or no, depending on whether the electric control 212 is activated or not. In the example shown, the pilot valve 210 is connected to the secondary pilot connector 244 via a non-return valve 216.
[0035] Comme on le voit sur la figure 1, la valve de pilotage 210 est positionnée directement au niveau du connecteur hydraulique secondaire 240. Ainsi, la pression de pilotage qui est prélevée n'est pas perturbée par les pertes de charge qui sont ensuite provoquées par le circuit hydraulique secondaire 200, ce qui permet donc d'améliorer le pilotage en cylindrée de la pompe hydraulique 110. As seen in Figure 1, the pilot valve 210 is positioned directly at the level of the secondary hydraulic connector 240. Thus, the pilot pressure which is taken off is not disturbed by the pressure drops which are then caused by the secondary hydraulic circuit 200, which therefore makes it possible to improve the displacement control of the hydraulic pump 110.
[0036] Le circuit hydraulique secondaire 200 comprend une valve de séquence 250. The secondary hydraulic circuit 200 includes a sequence valve 250.
[0037] La valve de séquence 250 est interposée entre le connecteur hydraulique secondaire 240 et les organes hydrauliques 220 du circuit hydraulique secondaire 200. La valve de séquence 250 est configurée de manière à n'être passante que lorsque la pression au niveau du connecteur hydraulique secondaire 240 dépasse une valeur seuil prédéterminée, par exemple comprise entre 100 et 150 bar, ou typiquement égale à 120 bar. La valve de séquence 250 peut notamment prendre la forme d'une soupape tarée. The sequence valve 250 is interposed between the secondary hydraulic connector 240 and the hydraulic components 220 of the secondary hydraulic circuit 200. The sequence valve 250 is configured so as to be conductive only when the pressure at the level of the hydraulic connector secondary 240 exceeds a predetermined threshold value, for example between 100 and 150 bar, or typically equal to 120 bar. The sequence valve 250 can in particular take the form of a calibrated valve.
[0038] La valve de séquence 250 permet ainsi d'assurer une pression minimale au niveau du connecteur hydraulique secondaire 240 (et donc du connecteur hydraulique 140) avant d'alimenter les organes hydrauliques 220 du circuit hydraulique secondaire 200. Ainsi, la valve de séquence permet d'assurer une pression minimale égale à la valeur seuil ainsi définie, qui est délivrée au circuit hydraulique auxiliaire 130. Assurer ainsi une pression au moins égale à ladite valeur seuil au circuit hydraulique auxiliaire 130 permet d'assurer le bon fonctionnement des systèmes hydrauliques auxiliaires du véhicule ou de l'engin, et permet donc de répondre aux problématiques liées au système du type « power beyond », à savoir un risque de sur-consommation de débit par l'attelage et donc un risque de perturbation des systèmes hydrauliques du véhicule ou de l'engin, ces derniers n'étant alors pas suffisamment alimentés. The sequence valve 250 thus makes it possible to ensure a minimum pressure at the level of the secondary hydraulic connector 240 (and therefore of the hydraulic connector 140) before supplying the hydraulic components 220 of the secondary hydraulic circuit 200. Thus, the valve of sequence makes it possible to ensure a minimum pressure equal to the threshold value thus defined, which is delivered to the auxiliary hydraulic circuit 130. Thus ensuring a pressure at least equal to said threshold value to the auxiliary hydraulic circuit 130 makes it possible to ensure the proper functioning of the systems auxiliary hydraulics of the vehicle or the machine, and therefore makes it possible to respond to the problems linked to the system of the "power beyond" type, namely a risk of over-consumption of flow by the coupling and therefore a risk of disturbance of the hydraulic systems of the vehicle or machine, the latter then not being sufficiently supplied.
[0039] La valve de séquence 250 telle qu'illustrée est montée en parallèle avec un clapet anti-retour 255, permettant un retour de fluide notamment pour un fonctionnement inversé. Ce clapet anti-retour 255 peut ainsi être qualifié de clapet de roue libre. [0039] The sequence valve 250 as illustrated is mounted in parallel with a non-return valve 255, allowing a return of fluid in particular for a reverse operation. This non-return valve 255 can thus be qualified as a free wheel valve.
[0040]0n voit que dans l'exemple illustré qui comprend la valve de pilotage 210, cette dernière est positionnée en amont de la valve de séquence 250. Ainsi, comme indiqué précédemment, la pression de pilotage qui est prélevée n'est pas perturbée par les pertes de charges qui sont ensuite provoquées par le circuit hydraulique secondaire 200, ce qui permet donc d'améliorer le pilotage en cylindrée de la pompe hydraulique 110. [0040]0n sees that in the example illustrated which includes the pilot valve 210, the latter is positioned upstream of the sequence valve 250. Thus, as indicated above, the pilot pressure which is taken off is not disturbed by the pressure drops which are then caused by the secondary hydraulic circuit 200, which therefore makes it possible to improve the displacement control of the hydraulic pump 110.
[0041] Le circuit hydraulique secondaire 200 tel que proposé comprend une valve de gavage 230, positionnée de manière à permettre un gavage en pression de la conduite basse pression par la conduite haute pression du circuit hydraulique secondaire 200. La valve de gavage est ici une soupape tarée, par exemple avec un tarage égal à 13 bar, et couplée à un clapet anti retour 235 afin d'assurer une circulation de fluide uniquement dans le sens de la conduite haute pression vers la conduite basse pression. La valve de gavage 230 présente typiquement un tarage à une valeur inférieure ou égale, ou typiquement légèrement inférieure à la valeur de tarage du clapet anti retour taré 205. Le clapet anti retour 235 est typiquement taré, avec un tarage à une valeur inférieure au tarage de la valve de gavage 230, et à une valeur supérieure au tarage du clapet anti retour taré 205. Le clapet anti retour 235 permet de protéger la valve de gavage 230 contre une montée en pression en provenance de la conduite basse pression, qui pourrait perturber le tarage de la valve de gavage 230. The secondary hydraulic circuit 200 as proposed comprises a boost valve 230, positioned so as to allow pressure boosting of the low pressure pipe by the high pressure pipe of the secondary hydraulic circuit 200. The boost valve here is a calibrated valve, for example with a calibration equal to 13 bar, and coupled to a non-return valve 235 in order to ensure fluid circulation only in the direction of the high pressure pipe towards the low pressure pipe. The booster valve 230 typically has a calibration at a value less than or equal to, or typically slightly lower than the calibration value of the calibrated non-return valve 205. The non-return valve 235 is typically calibrated, with a calibration at a value lower than the calibration of the booster valve 230, and at a value greater than the calibration of the calibrated non-return valve 205. The non-return valve 235 makes it possible to protect the booster valve 230 against a rise in pressure coming from the low pressure pipe, which could disturb the calibration of the booster valve 230.
[0042] Le gavage d'un circuit hydraulique permet essentiellement d'éviter tout manque d'huile dans le circuit, surtout si celui-ci comporte des moteurs hydrauliques, afin qu'il ne se produise jamais de cavitation qui peut endommager voire les composants hydrauliques. Cela revient à toujours assurer une pression positive minimale aux bornes de composants, en particuliers des moteurs hydrauliques, typiquement de l'ordre de 10 à 20 bar. [0042] The boosting of a hydraulic circuit essentially makes it possible to avoid any lack of oil in the circuit, especially if the latter includes hydraulic motors, so that cavitation never occurs which can damage or even damage the components. hydraulics. This amounts to always ensuring a minimum positive pressure at the terminals of components, in particular hydraulic motors, typically of the order of 10 to 20 bar.
[0043] La valve de gavage 230 est positionnée en amont de la valve de séquence 250 par rapport au connecteur hydraulique secondaire 240, ce qui permet ainsi d'assurer un gavage du circuit hydraulique secondaire 200 même si la valve de séquence 250 n'est pas passante, et ainsi notamment de réaliser un gavage avant l'alimentation du circuit hydraulique secondaire 200. La pression de gavage ainsi établie permet au circuit secondaire 200 de fonctionner en roue libre sous cette pression de gavage, tandis que l’alimentation de puissance est isolée par la valve de séquence 250. The boost valve 230 is positioned upstream of the sequence valve 250 with respect to the secondary hydraulic connector 240, which thus makes it possible to ensure boosting of the secondary hydraulic circuit 200 even if the valve of sequence 250 is not busy, and thus in particular to carry out a boost before the supply of the secondary hydraulic circuit 200. The boost pressure thus established allows the secondary circuit 200 to operate in freewheel mode under this boost pressure, while the boost pressure Power supply is isolated by sequence valve 250.
[0044] La valve de gavage 230 permet également de prélever une pression d pilotage, qui est typiquement employée pour le pilotage d'éléments du circuit hydraulique secondaire 200, notamment de valves associées aux organes hydrauliques 220. [0044] The booster valve 230 also makes it possible to sample a pilot pressure, which is typically used for piloting elements of the secondary hydraulic circuit 200, in particular valves associated with the hydraulic components 220.
[0045] Ce positionnement de la valve de gavage 230 dans le circuit hydraulique secondaire 200 permet également de prélever une pression de pilotage qui est ainsi effective dès qu'une pression est délivrée au connecteur hydraulique secondaire 240, et ce même si la valve de séquence 250 n'est pas passante. [0045] This positioning of the booster valve 230 in the secondary hydraulic circuit 200 also makes it possible to draw off a pilot pressure which is thus effective as soon as pressure is delivered to the secondary hydraulic connector 240, even if the sequence valve 250 is not through.
[0046] L'architecture du système tel que proposé permet ainsi d'établir une priorité sur les différents composants hydrauliques du système. Elle permet notamment d'assurer une alimentation suffisante des différents systèmes hydrauliques du véhicule ou de l'engin avant d'alimenter les systèmes de l'attelage. The architecture of the system as proposed thus makes it possible to establish a priority on the various hydraulic components of the system. In particular, it makes it possible to ensure sufficient supply to the various hydraulic systems of the vehicle or machine before supplying the coupling systems.
[0047] La figure 2 représente ainsi schématiquement l'application du système pour un attelage muni d'une assistance hydraulique. Par assistance hydraulique, on entend ici un entrainement des roues d'un véhicule ou d'un engin qui peut s'engager ou se désengager pour aider à la motricité de manière temporaire. Figure 2 thus schematically shows the application of the system for a hitch equipped with hydraulic assistance. By hydraulic assistance is meant here a driving of the wheels of a vehicle or of a machine which can engage or disengage to help motor skills temporarily.
[0048] Le même circuit peut s'utiliser pour tout consommateur hydraulique, tel qu'un entrainement, pour lequel on souhaite un fonctionnement en roue libre quand la valve de séquence se ferme. The same circuit can be used for any hydraulic consumer, such as a drive, for which freewheel operation is desired when the sequence valve closes.
[0049] Dans ce mode de réalisation, les organes hydrauliques 220 comprennent ici deux moteurs hydrauliques 282 et 284 montés en parallèle adaptés pour entrainer en rotation des organes de déplacement tels que des roues ou des essieux de l'attelage. On comprend que ce mode de réalisation n'est pas limitatif, et que le système peut être appliqué à un nombre quelconque de moteurs hydrauliques qui peuvent être par exemple montés en parallèle, en série, ou selon toute autre configuration adaptée. In this embodiment, the hydraulic components 220 here comprise two hydraulic motors 282 and 284 mounted in parallel adapted to drive in rotation displacement components such as wheels or axles of the coupling. It is understood that this embodiment is not limiting, and that the system can be applied to any number of engines hydraulics which can for example be connected in parallel, in series, or according to any other suitable configuration.
[0050] Les moteurs hydrauliques 282 et 284 sont ici alimentés via une valve d'alimentation 260 elle-même associée à une valve de pilotage 270. The hydraulic motors 282 and 284 are here supplied via a supply valve 260 itself associated with a pilot valve 270.
[0051] La valve de pilotage 270 est une électrovanne adaptée pour piloter la valve d'alimentation 260. Elle est reliée au réservoir R et prélève une pression de pilotage via un repiquage entre la valve de gavage 230 et le clapet anti retour 235. Cette pression de pilotage permet d'actionner des commandes hydrauliques de la valve d'alimentation 260, et également de réaliser une mise en pression des conduites hydrauliques liées aux moteurs hydrauliques 282 et 284 préalablement à leur mise en service. La valve de pilotage 270 et la valve d'alimentation 260 coopèrent ainsi pour définir une configuration de roue libre dans laquelle les moteurs hydrauliques 282 et 284 sont à pression ambiante et sont désengagés des roues, une configuration de mise en cylindrée dans laquelle la pression de pilotage est appliquée aux moteurs hydrauliques 282 et 284, dans laquelle les moteurs sont engagés sur les roues mais en équipression, et une configuration engagée dans laquelle les moteurs hydrauliques 282 et 284 sont alimentés par la pompe hydraulique 110 par la valve de gavage 230, sous réserve que la valve e de séquence 250 soit fermée. The pilot valve 270 is a solenoid valve adapted to pilot the supply valve 260. It is connected to the reservoir R and draws pilot pressure via a tapping between the booster valve 230 and the non-return valve 235. This pilot pressure makes it possible to actuate the hydraulic controls of the supply valve 260, and also to pressurize the hydraulic pipes linked to the hydraulic motors 282 and 284 prior to their commissioning. The pilot valve 270 and the supply valve 260 thus cooperate to define a coasting configuration in which the hydraulic motors 282 and 284 are at ambient pressure and are disengaged from the wheels, a displacement configuration in which the pressure of piloting is applied to the hydraulic motors 282 and 284, in which the motors are engaged on the wheels but in equal pressure, and an engaged configuration in which the hydraulic motors 282 and 284 are supplied by the hydraulic pump 110 by the booster valve 230, under provided that sequence valve 250 is closed.
[0052] La valve d'alimentation 260 et une valve à deux ou trois positions, la position centrale pouvant être une position transitoire et fugitive, qui définit trois états de raccordement des moteurs hydrauliques 282 et 284 sur la pompe hydraulique 110 via le port hydraulique, de gauche à droite sur la figure 2, à savoir : un état raccordé, un état transitoire raccordé mais relié au gavage, un état non raccordé. La position centrale peut être utilisée pour un engagement des moteurs hydrauliques à pression réduite, avant de commuter vers l'engagement définitif. [0052] The supply valve 260 and a valve with two or three positions, the central position being able to be a transitory and fugitive position, which defines three states of connection of the hydraulic motors 282 and 284 on the hydraulic pump 110 via the hydraulic port , from left to right in FIG. 2, namely: a connected state, a transient state connected but connected to the force-feeding, a non-connected state. The center position can be used to engage the hydraulic motors at reduced pressure, before switching to final engagement.
[0053] La valve de pilotage 270 est typiquement une valve à trois position, avec une position centrale neutre, qui définit de gauche à droite sur la figure 2 : une position pour le raccordement avec contournement forcé des moteurs hydrauliques 282 et 284 au gavage, une position neutre qui force le non raccordement des moteurs hydrauliques 282 et 284, et une position raccordée dans laquelle les moteurs hydrauliques 282 et 284 sont alimentés via I connecteur hydraulique secondaire 240. The pilot valve 270 is typically a three-position valve, with a central neutral position, which defines from left to right in FIG. 2: a position for connection with forced bypass of the hydraulic motors 282 and 284 to the force-feeding a neutral position which forces the non-connection of the hydraulic motors 282 and 284, and a connected position wherein the hydraulic motors 282 and 284 are powered via the secondary hydraulic connector 240.
[0054] Les moteurs hydrauliques 282 et 284, sont typiquement des moteurs du type débrayable, par exemple avec un engagement sur l'axe des roues par un embrayage ou un crabot, ou du type à pistons radiaux et came multilobe avec désengagement par rétractation des pistons dans le bloc cylindre. De tels moteurs hydrauliques peuvent se débrayer automatiquement si la pression d'alimentation est inférieure à un certain seuil. De cette manière l'attelage peut être entraîné sans effort lorsque les moteurs sont désengagés. The hydraulic motors 282 and 284 are typically motors of the disengageable type, for example with engagement on the axis of the wheels by a clutch or dog clutch, or of the type with radial pistons and multilobe cam with disengagement by retraction of the pistons in the cylinder block. Such hydraulic motors can disengage automatically if the supply pressure is below a certain threshold. In this way the hitch can be driven effortlessly when the motors are disengaged.
[0055] Le circuit présenté correspond au cas où les moteurs sont du type à pistons radiaux et came multilobe avec désengagement par rétractation des pistons dans le bloc cylindre. La manoeuvre de la valve d'alimentation entraine automatiquement la rétractation ou la sortie des pistons pour réaliser le désengagement ou l'engagement des moteurs. The circuit shown corresponds to the case where the engines are of the radial piston and multilobe cam type with disengagement by retraction of the pistons in the cylinder block. The operation of the supply valve automatically causes the retraction or the extension of the pistons to achieve the disengagement or the engagement of the motors.
[0056] Un clapet de roue libre 300 des moteurs est placé entres les lignes d'aspiration et de refoulement des moteurs hydrauliques 282 et 284 en amont de la valve d'alimentation 260. Ce clapet de roue libre 300 permet un fonctionnement en roue libre des moteurs hydrauliques 282 et 284 quand la valve de séquence 250 est fermée, et que la valve d'alimentation 260 est en position d'engagement. Le clapet de roue libre 300 permet le fonctionnement en roue libre des moteurs hydrauliques 282 et 284, et donc de ne pas bloquer ou faire caviter les moteurs hydrauliques 282 et 284 quand la valve de séquence isole les moteurs hydrauliques 282 et 284 du refoulement de la pompe hydraulique 110. Pour assurer un bon fonctionnement, c'est-à-dire que les moteurs hydrauliques 282 et 284 ne manquent pas d'huile, l'une des lignes d'aspiration ou de refoulement du circuit hydraulique secondaire 200 est placée à la pression de gavage grâce au clapet anti retour 235. Plus particulièrement sur la figure 2, la ligne de refoulement des moteurs hydrauliques 282 et 284 est reliée au clapet 235 anti retour et donc à la valve de gavage 230, ce qui garantit un minimum de pression pendant le fonctionnement en contournement (ou bipass) des moteurs hydrauliques 282 et 284. Dans ce fonctionnement en roue libre, les lignes d'alimentation et de refoulement des moteurs 282 et 284 sont sensiblement à la pression fixée par la valve de gavage 235, aux pertes de charge près. A freewheel valve 300 of the motors is placed between the suction and discharge lines of the hydraulic motors 282 and 284 upstream of the supply valve 260. This freewheel valve 300 allows freewheeling operation hydraulic motors 282 and 284 when sequence valve 250 is closed, and supply valve 260 is in the engaged position. The freewheel valve 300 allows the freewheeling operation of the hydraulic motors 282 and 284, and therefore not to block or cause the hydraulic motors 282 and 284 to cavitate when the sequence valve isolates the hydraulic motors 282 and 284 from the discharge of the hydraulic pump 110. To ensure proper operation, that is to say that the hydraulic motors 282 and 284 do not run out of oil, one of the suction or discharge lines of the secondary hydraulic circuit 200 is placed at the booster pressure thanks to the non-return valve 235. More particularly in FIG. 2, the discharge line of the hydraulic motors 282 and 284 is connected to the non-return valve 235 and therefore to the booster valve 230, which guarantees a minimum of pressure during bypass operation (or bypass) of hydraulic motors 282 and 284. In this wheel operation free, the supply and discharge lines of the motors 282 and 284 are substantially at the pressure set by the booster valve 235, except for pressure drops.
[0057] Le clapet de roue libre 255 permet également une rotation en sens inverse des moteurs hydrauliques, par exemple dans le cas où l'attelage est entraîné en marche arrière. Les moteurs hydrauliques 282 et 284 présentent alors un fonctionnement de pompe, et fournissent un débit qui passe par la valve d'alimentation 260, puis par le clapet de roue libre 255 et en amont de la valve de gavage 230 pour rejoindre la ligne venant de la pompe hydraulique 110. A cet instant la pression de la ligne hydraulique est définie par la pression de la pompe hydraulique 110. La ligne de refoulement des moteurs hydrauliques 282 et 284 est donc à cet instant à la pression de la pompe hydraulique 110. Le débit venant des moteurs hydrauliques est en contresens par rapport au débit de la pompe hydraulique 110, c'est-à-dire que le mouvement des moteurs hydrauliques s'oppose à la poussée de la pompe hydraulique 110. Si la pompe hydraulique 110 est typiquement du type « load sensing » elle va réguler sa cylindrée pour maintenir la pression cible qui lui est demandée, et son débit peut diminuer jusqu'à être sensiblement nul puisque les moteurs 282 et 284 ne consomment plus de fluide sur cette ligne. Les moteurs hydrauliques 282 et 284 appelant du débit par leur orifice d'aspiration, du fluide va être fourni par la valve de gavage 230. Le débit poussé par les moteurs hydraulique 282 et 284 est alors renvoyé vers les moteurs hydrauliques 282 et 284 via la valve de gavage 230, le clapet antiretour 235 et la valve d'alimentation 260. Le clapet anti-retour 235 est typiquement à tarage sensiblement nul. Il peut éventuellement être muni d'un faible ressort de pré positionnement pour sa stabilité, par exemple taré à 1 Bar. La valve de gavage 230 est typiquement tarée à 13 bar et fonctionne en réducteur de pression et réagit à la pression aval. La ligne en aval de la valve de gavage 230 est donc régulée à 13 bar. Le clapet taré 205 est typiquement taré à une valeur légèrement supérieure à celle de la valve de gavage 230, typiquement 15 bar, et dans ce cas de figure doit rester fermé. La ligne d'aspiration des moteurs hydrauliques est donc sensiblement maintenue à la pression de gavage, typiquement entre 13 et 15 bar. [0058] Ainsi, en cas de survitesse, c'est-à-dire si la vitesse du véhicule ou de l'engin dépasse les capacités de la pompe 110 en regard du besoin des moteurs hydrauliques 282 et 284, ou en cas de manque d'alimentation temporaire venant de la pompe hydraulique du tracteur, par exemple si le régime du moteur primaire M du véhicule ou de l'engin diminue parce qu'on change de rapport de transmission, ou qu'un consommateur hydraulique du véhicule ou de l'engin augmente sa consommation, la valve de séquence se ferme, et les moteurs hydrauliques 282 et 284 tournent en roue libre par le clapet de roue libre 300 tandis que la pression minimale de gavage est assurée par la valve de gavage 230. The freewheel valve 255 also allows rotation in the opposite direction of the hydraulic motors, for example in the case where the hitch is driven in reverse. The hydraulic motors 282 and 284 then operate as a pump, and provide a flow which passes through the supply valve 260, then through the freewheel valve 255 and upstream of the booster valve 230 to join the line coming from the hydraulic pump 110. At this instant the pressure of the hydraulic line is defined by the pressure of the hydraulic pump 110. The discharge line of the hydraulic motors 282 and 284 is therefore at this instant at the pressure of the hydraulic pump 110. The flow coming from the hydraulic motors is in the opposite direction with respect to the flow of the hydraulic pump 110, that is to say that the movement of the hydraulic motors opposes the thrust of the hydraulic pump 110. If the hydraulic pump 110 is typically of the "load sensing" type, it will regulate its displacement to maintain the target pressure which is required of it, and its flow rate can decrease to substantially zero since the motors 282 and 284 no longer consume fluid on this line. The hydraulic motors 282 and 284 calling for flow through their suction port, fluid will be supplied by the booster valve 230. The flow pushed by the hydraulic motors 282 and 284 is then returned to the hydraulic motors 282 and 284 via the booster valve 230, non-return valve 235 and supply valve 260. Non-return valve 235 is typically at substantially zero calibration. It may optionally be provided with a weak pre-positioning spring for its stability, for example calibrated at 1 Bar. The booster valve 230 is typically calibrated at 13 bar and operates as a pressure reducer and reacts to the downstream pressure. The line downstream of the booster valve 230 is therefore regulated at 13 bar. The calibrated valve 205 is typically calibrated at a value slightly higher than that of the booster valve 230, typically 15 bar, and in this case must remain closed. The suction line of the hydraulic motors is therefore substantially maintained at the boost pressure, typically between 13 and 15 bar. Thus, in the event of overspeed, that is to say if the speed of the vehicle or of the machine exceeds the capacities of the pump 110 with regard to the need for the hydraulic motors 282 and 284, or in the event of a lack temporary supply coming from the hydraulic pump of the tractor, for example if the speed of the primary engine M of the vehicle or of the machine decreases because the transmission ratio is changed, or that a hydraulic consumer of the vehicle or of the The machine increases its consumption, the sequence valve closes, and the hydraulic motors 282 and 284 freewheel through the freewheel valve 300 while the minimum boost pressure is ensured by the boost valve 230.
[0059] En cas d'utilisation en marche arrière, dans le cas où la valve d'alimentation 260 est actionnée, le clapet de roue libre 255 assure une protection en permettant un flux inverse. When used in reverse, in the case where the supply valve 260 is actuated, the freewheel valve 255 provides protection by allowing reverse flow.
[0060] En cas d'utilisation en marche arrière, la valve de pilotage 210 est typiquement pilotée de manière à être dans sa configuration non passante, ce qui vient ainsi minimiser la consigne de cylindrée appliquée à la pompe hydraulique 110, par exemple pour qu'elle délivre une pression de l'ordre de 20 bar et non pas une pression maximale qui peut par exemple être de l'ordre de 200, 250 ou 350 bar selon la pompe hydraulique et l'engin. Ce pilotage permet de minimiser la contrepoussée des moteur hydrauliques 282 et 284 pendant la marche arrière. Cette utilisation permet de réaliser des marches arrière rapides sans changer le positionnement de la valve d'alimentation 260 dans de bonnes conditions. [0060] In the event of use in reverse, the pilot valve 210 is typically controlled so as to be in its non-passing configuration, which thus minimizes the displacement setpoint applied to the hydraulic pump 110, for example so that 'it delivers a pressure of around 20 bar and not a maximum pressure which can for example be around 200, 250 or 350 bar depending on the hydraulic pump and the machine. This piloting makes it possible to minimize the counterthrust of the hydraulic motors 282 and 284 during reverse travel. This use makes it possible to carry out quick reverses without changing the positioning of the supply valve 260 under good conditions.
[0061] Le circuit hydraulique décrit est typiquement dédié à une pompe hydraulique pour circuit en boucle ouverte, suivant la dénomination anglaise « open-loop ». Ce circuit ne fonctionne que dans un seul sens, qui est par exemple le sens d'avancement d'un véhicule ou d'un engin. Pour un fonctionnement identique en marche arrière, ou pour une fonction de retenue dans les descentes, qui s'oppose à l'avancement, on peut alors ajouter une valve d'inversion de sens à deux positions entre les moteurs et la valve d'alimentation, sans que le reste du circuit hydraulique ne soit modifié. [0062] Le système tel que proposé permet ainsi notamment d'employer des systèmes hydrauliques ayant une consommation de débit potentiellement élevée, par exemple une assistance hydraulique temporaire pour l'entrainement des roues de l'attelage. The hydraulic circuit described is typically dedicated to a hydraulic pump for an open-loop circuit, according to the English name "open-loop". This circuit only works in one direction, which is for example the direction of travel of a vehicle or of a machine. For identical operation in reverse, or for a restraint function on descents, which opposes forward movement, a two-position reversing valve can then be added between the motors and the supply valve. , without the rest of the hydraulic circuit being modified. The system as proposed thus makes it possible in particular to use hydraulic systems having a potentially high consumption of flow, for example temporary hydraulic assistance for driving the wheels of the coupling.
[0063] En effet, dans une architecture conventionnelle qui serait dépourvue de la valve de séquence 250 et couplée sur un connecteur du type « power beyond » directement relié à la pompe hydraulique du véhicule ou de l'engin, une assistance hydraulique en traction poserait des problématiques de consommation excessive de débit et donc de perturbation des fonctions hydrauliques du véhicule ou de l'engin, notamment en cas de patinage ou de perte d'adhérence. En particulier, un excès de consommation de l'assistance connectée sur un port du type « power beyond » pourrait faire chuter la pression pour les autres fonctions hydrauliques du tracteur ou de l'engin, notamment la direction assistée, le freinage ou les organes de relevage. De plus dans le cas de figure ou la valve de séquence 250 isolerait des moteurs hydrauliques d'entrainement, un clapet de roue libre 300 permet la continuité du mouvement tandis que la pression de gavage est maintenue. [0063] Indeed, in a conventional architecture which would be devoid of the sequence valve 250 and coupled to a connector of the “power beyond” type directly connected to the hydraulic pump of the vehicle or of the machine, a hydraulic assistance in traction would pose problems of excessive flow consumption and therefore disruption of the hydraulic functions of the vehicle or machine, in particular in the event of slippage or loss of grip. In particular, excessive consumption of the assistance connected to a port of the "power beyond" type could cause the pressure to drop for the other hydraulic functions of the tractor or machine, in particular the power steering, the braking or the lifting. Furthermore, in the case where the sequence valve 250 isolates the hydraulic drive motors, a freewheel valve 300 allows the continuity of the movement while the booster pressure is maintained.
[0064] L'invention telle que proposée, et notamment l'intégration de la valve de séquence 250 permet de répondre à ces problématiques. The invention as proposed, and in particular the integration of the sequence valve 250, makes it possible to respond to these problems.
[0065] Bien que la présente invention ait été décrite en se référant à des exemples de réalisation spécifiques, il est évident que des modifications et des changements peuvent être effectués sur ces exemples sans sortir de la portée générale de l’invention telle que définie par les revendications. En particulier, des caractéristiques individuelles des différents modes de réalisation illustrés/mentionnés peuvent être combinées dans des modes de réalisation additionnels. Par conséquent, la description et les dessins doivent être considérés dans un sens illustratif plutôt que restrictif. Although the present invention has been described with reference to specific embodiments, it is obvious that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the revendications. In particular, individual features of the different illustrated/mentioned embodiments can be combined in additional embodiments. Accordingly, the description and the drawings should be considered in an illustrative rather than restrictive sense.
[0066] Il est également évident que toutes les caractéristiques décrites en référence à un procédé sont transposables, seules ou en combinaison, à un dispositif, et inversement, toutes les caractéristiques décrites en référence à un dispositif sont transposables, seules ou en combinaison, à un procédé. It is also obvious that all the characteristics described with reference to a method can be transposed, alone or in combination, to a device, and conversely, all the characteristics described with reference to a device can be transposed, alone or in combination, to a device. a method.

Claims

Revendications Claims
[Revendication 1] Ensemble comprenant : [Claim 1] Set comprising:
- un véhicule comprenant un circuit hydraulique primaire (100), comprenant une pompe hydraulique (110) asservie en charge, un circuit hydraulique auxiliaire (130) alimenté par la pompe hydraulique (110), et un port hydraulique comprenant un connecteur hydraulique (140) alimenté par la pompe hydraulique (110), - a vehicle comprising a primary hydraulic circuit (100), comprising a load-dependent hydraulic pump (110), an auxiliary hydraulic circuit (130) supplied by the hydraulic pump (110), and a hydraulic port comprising a hydraulic connector (140) powered by the hydraulic pump (110),
- un attelage comprenant un circuit hydraulique secondaire (200), adapté pour être relié au port hydraulique, ledit circuit hydraulique secondaire (200) comprenant des organes hydrauliques (220) adaptés pour être alimentés via le connecteur hydraulique (140) ; caractérisé en ce que le circuit hydraulique secondaire (200) comprend une valve de séquence (250), positionnée en amont des organes hydrauliques (220), ladite valve de séquence (250) étant configurée de manière à être passante lorsque la pression au connecteur hydraulique (140) est supérieure ou égale à une valeur seuil, et non passante lorsque la pression au connecteur hydraulique (140) est inférieure à ladite valeur seuil. - a coupling comprising a secondary hydraulic circuit (200), adapted to be connected to the hydraulic port, said secondary hydraulic circuit (200) comprising hydraulic components (220) adapted to be supplied via the hydraulic connector (140); characterized in that the secondary hydraulic circuit (200) comprises a sequence valve (250), positioned upstream of the hydraulic components (220), said sequence valve (250) being configured so as to be conductive when the pressure at the hydraulic connector (140) is greater than or equal to a threshold value, and not conducting when the pressure at the hydraulic connector (140) is lower than said threshold value.
[Revendication 2] Ensemble selon la revendication 1, dans lequel la valve de séquence (250) est configurée de manière à définir la valeur seuil de pression en dessous de laquelle les organes hydrauliques (220) du circuit hydraulique secondaire (200) ne sont pas alimentés par la pompe hydraulique (110) via le connecteur hydraulique (140). [Claim 2] Assembly according to claim 1, in which the sequence valve (250) is configured so as to define the pressure threshold value below which the hydraulic components (220) of the secondary hydraulic circuit (200) are not powered by the hydraulic pump (110) via the hydraulic connector (140).
[Revendication 3] Ensemble selon la revendication 2, dans lequel la valve de séquence (250) est configurée de manière à définir une pression minimale comprise entre 100 et 150 bar au connecteur hydraulique (140) avant d'alimenter les organes hydrauliques (220) du circuit hydraulique secondaire (200). [Claim 3] Assembly according to claim 2, in which the sequence valve (250) is configured so as to define a minimum pressure of between 100 and 150 bar at the hydraulic connector (140) before supplying the hydraulic components (220) of the secondary hydraulic circuit (200).
[Revendication 4] Ensemble selon l'une des revendications 1 à 3, dans lequel la valve de séquence (250) est une soupape tarée. [Claim 4] Assembly according to one of Claims 1 to 3, in which the sequence valve (250) is a calibrated valve.
[Revendication 5] Ensemble selon l'une des revendications 1 à 4, dans lequel le circuit hydraulique secondaire (200) comprend une électrovanne (210) reliée au connecteur hydraulique, ladite électrovanne étant positionnée entre le connecteur hydraulique (140) et la valve de séquence (250), et étant configurée de manière à sélectivement renvoyer un signal de charge au contrôle de pompe (117) et ainsi piloter la cylindrée de la pompe hydraulique (HO). [Claim 5] Assembly according to one of Claims 1 to 4, in which the secondary hydraulic circuit (200) comprises a solenoid valve (210) connected to the hydraulic connector, the said solenoid valve being positioned between the hydraulic connector (140) and the sequence (250), and being configured to selectively return a load signal to the pump control (117) and thereby drive the displacement of the hydraulic pump (HO).
[Revendication 6] Ensemble selon l'une des revendications 1 à 5, dans lequel le circuit hydraulique secondaire (200) comprend une valve de gavage (230) adaptée pour réaliser un gavage du circuit secondaire (200), la valve de gavage (230) étant positionnée en amont de la valve de séquence (250) par rapport au connecteur hydraulique (140). [Claim 6] Assembly according to one of Claims 1 to 5, in which the secondary hydraulic circuit (200) comprises a booster valve (230) adapted to carry out a boosting of the secondary circuit (200), the booster valve (230 ) being positioned upstream of the sequence valve (250) with respect to the hydraulic connector (140).
[Revendication 7] Ensemble selon l'une des revendications précédentes, dans lequel les organes hydrauliques (220) du circuit hydraulique secondaire (200) comprennent au moins un moteur hydraulique. [Claim 7] Assembly according to one of the preceding claims, in which the hydraulic components (220) of the secondary hydraulic circuit (200) comprise at least one hydraulic motor.
[Revendication 8] Ensemble selon la revendication 6, dans lequel les organes hydrauliques (220) comprennent au moins un moteur hydraulique, le circuit hydraulique secondaire (200) comprenant un clapet de roue libre (300) positionné en amont d'une valve d'alimentation (260) des organes hydrauliques et un clapet anti retour (235) relié à la valve de gavage (230) de sorte que ledit au moins un moteur hydraulique peut tourner en roue libre via le clapet de roue libre (300), et le moteur hydraulique présentant une alimentation et un refoulement maintenus à une pression de gavage via le clapet anti retour (235) et la valve de gavage (230) lorsque la valve de séquence (250) est non passante. [Claim 8] Assembly according to claim 6, in which the hydraulic components (220) comprise at least one hydraulic motor, the secondary hydraulic circuit (200) comprising a free wheel valve (300) positioned upstream of a supply (260) of the hydraulic components and a non-return valve (235) connected to the booster valve (230) so that said at least one hydraulic motor can freewheel via the freewheel valve (300), and the hydraulic motor having a supply and a discharge maintained at a booster pressure via the non-return valve (235) and the booster valve (230) when the sequence valve (250) is not conducting.
[Revendication 9] Ensemble selon la revendication 6, dans lequel les organes hydrauliques (220) comprennent au moins un moteur hydraulique, le circuit hydraulique secondaire (200) comprenant un clapet anti retour (255) positionné en contournement de la valve de séquence (250), de sorte que le fluide dans le circuit hydraulique secondaire (200) peut circuler dans un premier sens via la valve de séquence, et dans un second sens inverse au premier sens via le clapet anti retour (255), de manière à permettre un 18 entrainement dudit au moins un moteur hydraulique selon deux sens de rotation opposés. [Claim 9] Assembly according to claim 6, in which the hydraulic components (220) comprise at least one hydraulic motor, the secondary hydraulic circuit (200) comprising a check valve (255) positioned bypassing the sequence valve (250 ), so that the fluid in the secondary hydraulic circuit (200) can circulate in a first direction via the sequence valve, and in a second direction opposite to the first direction via the non-return valve (255), so as to allow a 18 driving said at least one hydraulic motor in two opposite directions of rotation.
[Revendication 10] Ensemble suivant la revendication 9 prise en combinaison avec la revendication 5, dans lequel l'électrovanne (210) est configurée de manière à être dans une configuration non passante lorsque le fluide circule dans le second sens dans le circuit hydraulique secondaire (200). [Claim 10] Assembly according to claim 9 taken in combination with claim 5, in which the solenoid valve (210) is configured so as to be in a non-passing configuration when the fluid flows in the second direction in the secondary hydraulic circuit ( 200).
[Revendication 11] Ensemble selon l'une des revendications 1 à 10, dans lequel la pompe hydraulique (110) est reliée directement au connecteur hydraulique (140). [Claim 11] Assembly according to one of Claims 1 to 10, in which the hydraulic pump (110) is connected directly to the hydraulic connector (140).
[Revendication 12] Ensemble selon l'une des revendications précédentes, dans lequel le véhicule est un tracteur. [Claim 12] Assembly according to one of the preceding claims, in which the vehicle is a tractor.
[Revendication 13] Ensemble selon la revendication 12, dans lequel le circuit hydraulique secondaire (200) est un circuit d'assistance hydraulique, comprenant un ou plusieurs moteurs hydrauliques (282, 284) adaptés pour sélectivement entrainer en rotation un ou plusieurs organes de déplacement de l'attelage. [Claim 13] Assembly according to claim 12, in which the secondary hydraulic circuit (200) is a hydraulic assistance circuit, comprising one or more hydraulic motors (282, 284) adapted to selectively drive in rotation one or more displacement members of the hitch.
PCT/FR2022/052473 2021-12-23 2022-12-22 Improved hydraulic architecture for coupling a secondary hydraulic circuit WO2023118756A1 (en)

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FR2114339A FR3131353B1 (en) 2021-12-23 2021-12-23 Improved hydraulic architecture for coupling a secondary hydraulic circuit

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7918285B1 (en) * 2010-04-19 2011-04-05 Deere & Company Implement with active wing down force and wing lift sequencing
DE102014103932B3 (en) * 2014-03-21 2015-07-23 Bucher Hydraulics Gmbh Control device for a hydraulic working machine, hydraulic system and method for controlling a hydraulic system
EP3584450A1 (en) * 2018-06-18 2019-12-25 CLAAS Industrietechnik GmbH Load signal control system of a hydraulic system of an attachment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7918285B1 (en) * 2010-04-19 2011-04-05 Deere & Company Implement with active wing down force and wing lift sequencing
DE102014103932B3 (en) * 2014-03-21 2015-07-23 Bucher Hydraulics Gmbh Control device for a hydraulic working machine, hydraulic system and method for controlling a hydraulic system
EP3584450A1 (en) * 2018-06-18 2019-12-25 CLAAS Industrietechnik GmbH Load signal control system of a hydraulic system of an attachment

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