EP3324723A1 - Barre de poussée hydraulique - Google Patents

Barre de poussée hydraulique

Info

Publication number
EP3324723A1
EP3324723A1 EP16753818.0A EP16753818A EP3324723A1 EP 3324723 A1 EP3324723 A1 EP 3324723A1 EP 16753818 A EP16753818 A EP 16753818A EP 3324723 A1 EP3324723 A1 EP 3324723A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
top link
accumulator
pressure accumulator
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16753818.0A
Other languages
German (de)
English (en)
Inventor
Georg Hadersdorfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Log Hydraulik GmbH
Original Assignee
Log Hydraulik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Log Hydraulik GmbH filed Critical Log Hydraulik GmbH
Publication of EP3324723A1 publication Critical patent/EP3324723A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/06—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors
    • A01B59/066—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle, e.g. three-point hitches
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • 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
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a hydraulic top link for a three-point linkage according to the preamble of claim 1 and a three-point linkage.
  • Hydraulic top links are commonly used in the field of commercial vehicles, in particular agricultural vehicles, to couple an implement, such as a plow, to the agricultural utility vehicle, such as a tractor.
  • the implement is coupled via a three-point linkage to the commercial vehicle.
  • the three-point power lift used typically have two lower links and a top link, which are attached on the one hand to the utility vehicle and on the other hand on the implement.
  • This upper link usually have a hydraulic cylinder for adjusting the top link.
  • hydraulic top links typically two operating states are known: for transport, the implement is usually raised, in working mode, the implement is usually lowered.
  • a disadvantage of these transport dampers from the prior art is that by lowering the lower link and thus a lowering of the front part of the implement by the force distribution and the leverage there is a risk that the front axle of the commercial vehicle loses contact with the ground. To avoid this, a complicated technology is necessary, which can not be economically retrofitted.
  • the present invention is therefore based on the object vorzugific a top link or a three-point linkage, which prevents a rocking of the implement.
  • the hydraulic top link comprises, as is known per se, a hydraulic system with a hydraulic cylinder comprising a cylinder tube and a piston rod.
  • the hydraulic cylinder is at least part of a lever arm of the upper link.
  • Such a top link is usually used in a three-point linkage.
  • the upper link is fastened at one end to a commercial vehicle and at the other end, typically the end of the piston rod, to a working device. With a tensile force on the upper link, the tensile force thus acts on the piston rod of the hydraulic cylinder.
  • a reverse attachment is also within the scope of the invention.
  • At least one pressure accumulator with a biasing pressure via a hydraulic line to the hydraulic system is connected to the annular space side of the hydraulic cylinder.
  • the upper link according to the invention thus differs in essential aspects of previously known upper links:
  • the hydraulic system is biased on one side to a certain pressure.
  • the piston rod In a tensile load, the piston rod is pulled out when a certain limit force is exceeded, so that the coupled implement lowers.
  • the preload pressure of the pressure accumulator specifies the limit force at which the upper link pulls apart in which the piston rod is pulled out of the cylinder tube.
  • the pressure accumulator can also be used for traction enhancement.
  • a tensile force can be actively generated at the top link. This gives rise to the advantage that more weight is placed on the interchain of the commercial vehicle or tractor and in the rear part of the implement. This strengthens the traction and thus the drive.
  • the biasing pressure of the at least one pressure accumulator is adjustable, preferably between 20 and 150 bar, in particular preferably between 30 and 100 bar, most preferably at 100 bar.
  • the pressure accumulator is designed as a piston accumulator, diaphragm accumulator or bladder accumulator. Most preferably, the pressure accumulator is designed as a nitrogen-filled memory.
  • a limit force for the tensile load of the upper link is adjustable. If the tensile load on the upper link is less than the limit force, the hydraulic piston is not pulled out of the hydraulic cylinder, ie the upper link does not change its length. If the limit force is exceeded, i. H . When the tensile load on the top link is greater than the limit force, the hydraulic piston becomes out of the hydraulic cylinder pulled out and the top link extended. When the limit force is exceeded, a very rapid withdrawal of the hydraulic piston is preferably possible.
  • the limit force is adapted to the weight of the implement.
  • a non-return throttle valve is provided in the hydraulic line between the hydraulic system and the pressure accumulator as a damping element.
  • the non-return throttle valve is arranged between the hydraulic system and pressure accumulator, that when the hydraulic piston is pulled out of the hydraulic cylinder, the flow of the hydraulic fluid into the pressure accumulator is not hindered.
  • the hydraulic piston can be pulled out very quickly when the limit force is exceeded.
  • the throttle of the non-return throttle valve damps the return flow of the hydraulic fluid. As a result, a rocking of the movement of the upper link is prevented.
  • a valve and the associated control block is provided.
  • the hydraulic lines with a check valve in the reverse direction are completed on both sides of the hydraulic cylinder. This prevents a failure of the hydraulic line from dropping the implement. This keeps the hydraulic fluid in the hydraulic system. If necessary, for example, to change the length of the upper link, can be replenished by the commercial vehicle hydraulic fluid.
  • a shut-off valve is provided in the hydraulic line between the hydraulic system and the accumulator.
  • the shut-off valve is arranged between the non-return throttle valve and the hydraulic system.
  • the shut-off valve and the non-return throttle valve may also be combined as a valve, for example as a solenoid-controlled valve.
  • the at least one pressure accumulator is integrated in the hydraulic cylinder. This can be done for example in the form of a piston accumulator.
  • a second pressure accumulator is provided on the annular space side with a second, preferably lower, preload pressure for traction reinforcement.
  • a second, preferably lower, preload pressure for traction reinforcement is no load on the top link in the prior art upper links from the prior art in the operating state. The weight of the implement is carried by the lower links alone.
  • the piston rod of the upper link adjusts to the unevenness, so that the tensile force for the traction gain is kept substantially constant by the second pressure accumulator.
  • a pressure in the second pressure accumulator of 5 to 50 bar, particularly preferably about 30 bar is preferably applied.
  • both the at least one pressure accumulator for the damping of the upper link and / or the second pressure accumulator for the traction boost are integrated in the hydraulic cylinder. This can be done for example via a piston or membrane memory.
  • Top links are usually formed either at both ends with an eyelet or a ball head. Alternatively, a catch hook may be provided at one end. Usually, the upper link is attached to the end of the eyelet on the utility vehicle, while on the fishing hook or other eyelet the implement can be attached.
  • the object of the invention is further achieved by a three-point linkage with two lower links and a top link.
  • Three-point power lift typically have two lower links and a top link, on the one hand attached to the utility vehicle and on the other hand on the implement.
  • the top link is usually designed as a hydraulic top link with a hydraulic system for adjusting the top link.
  • the three-point linkage is designed with a hydraulic upper link, which has at least one pressure accumulator with a preload pressure on the annular space side, which is connected via a hydraulic line to the hydraulic system.
  • Figure 1 is a schematic representation of a first embodiment of a top link according to the invention
  • Figure 2 is a schematic representation of a second embodiment of a top link according to the invention with traction reinforcement
  • Figure 3 is a circuit diagram for an embodiment of a top link according to the invention.
  • FIG. 1 shows a schematic representation of a first embodiment of a top link 1 according to the invention.
  • the top link 1 is a hydraulic top link comprising a hydraulic system 2 with a hydraulic cylinder comprising a cylinder tube 2a and a piston 2b rod forms.
  • the hydraulic cylinder 2 is part of the lever arm of the upper link. 1
  • the top link 1 is, as is known, formed at one end with an eyelet (not shown) and at the other end with a fishing hook (not shown).
  • a pressure accumulator 3 is connected to the hydraulic system 2 via a hydraulic line 4. Between the pressure accumulator 3 and the hydraulic system 2, a shut-off valve 5 and a non-return throttle valve 6 are arranged.
  • a blocking block 7 is provided, which can be controlled via a controller 8 of the commercial vehicle (not shown).
  • the blocking block 7 is connected via the hydraulic line 14 to the control unit 8.
  • the accumulator 3 is filled with gas as a gas storage, in the present case designed as a piston accumulator.
  • the upper link is biased by the pressure accumulator 3 on one side to a biasing pressure of about 100 bar.
  • a biasing pressure about the biasing pressure is a limit force for the tensile load of the upper link 1 adjustable.
  • the limit force is adapted to the weight of the implement.
  • the implement When transporting a working implement (not shown), in particular a plow, the implement is coupled to a commercial vehicle (not shown). Due to the weight of the implement, the hydraulic top link 1 on train load. The front axle of the commercial vehicle is thereby relieved. An unloaded front axle can have an unstable steering behavior.
  • the piston rod 2 b When the limit force is exceeded, for example by an additional load due to a ground unevenness, the piston rod 2 b is pulled out of the cylinder tube 2 a.
  • the hydraulic oil flows via a damping throttle designed as a check throttle valve 6 into the nitrogen-filled pressure accumulator 3.
  • the check valve 6a is in the direction from the hydraulic cylinder to the pressure accumulator 3 in the forward direction.
  • the pressure accumulator can be deactivated via a manual or solenoid-operated shut-off valve 5.
  • the implement During transport of the implement, the implement is, as described, coupled to a utility vehicle. Due to the weight of the implement, the hydraulic top link 1 to tensile load. The front axle of the commercial vehicle is thereby relieved. A relieved front axle can have an unstable steering behavior. Due to the change in length of the upper link in the tensile load, the implement is lowered. The lower links remain in the same position, so that the front articulation points of the implement are fixed. The rear area of the implement thus falls down. The damping effect by the fall of the rear part of the implement is increased by the leverage. Lowering the working implement in the rear area therefore prevents the front axle of the commercial vehicle from coming up due to excessive load on the H interaxle and improves the steering behavior of the vehicle.
  • Figure 2 shows a schematic representation of another embodiment with traction enhancement.
  • the hydraulic top link comprises a second pressure accumulator 13 for the traction reinforcement.
  • the second pressure accumulator 13 is also connected on the annular space side to the hydraulic system 2.
  • the pressure accumulator 13 is formed with a gas biasing pressure of about 30 bar.
  • the piston rod 2 b of the upper link adjusts to the unevenness, so that the traction boosting force through the second pressure accumulator 13 is kept substantially constant.
  • FIG. 3 shows a circuit diagram for a top link according to the invention.
  • the hydraulic top link 1 is formed with a first pressure accumulator 3 for the transport damping and a second pressure accumulator 13 for the traction reinforcement.
  • the first accumulator 3 for the transport damping is designed as a 0.5 liter reservoir with 135 bar preload pressure. With the check valve 22, the pressure in the hydraulic system is kept constant.
  • the second pressure accumulator 13 for the traction enhancement is designed as a 0.5 liter accumulator with 50 bar preload pressure.
  • two controlled valves 20, 21 are provided. It can also be provided only one of the two valves.
  • a shut-off valve 5 is provided, in the present case an electric shut-off valve. For a lifting of the implement or the transport so the traction gain can be disabled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Zoology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

La présente invention concerne une barre de poussée hydraulique pour un relevage trois points comportant un système hydraulique pourvu d'un piston hydraulique et d'un vérin hydraulique, le piston hydraulique constituant au moins une partie d'un bras de levier de la barre de poussée hydraulique. Selon l'invention, du côté de l'espace annulaire, au moins un accumulateur de pression avec une pression de précontrainte est raccordé au système hydraulique par l'intermédiaire d'une conduite hydraulique.
EP16753818.0A 2015-07-24 2016-07-22 Barre de poussée hydraulique Withdrawn EP3324723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015112165 2015-07-24
PCT/DE2016/100331 WO2017016544A1 (fr) 2015-07-24 2016-07-22 Barre de poussée hydraulique

Publications (1)

Publication Number Publication Date
EP3324723A1 true EP3324723A1 (fr) 2018-05-30

Family

ID=56740039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16753818.0A Withdrawn EP3324723A1 (fr) 2015-07-24 2016-07-22 Barre de poussée hydraulique

Country Status (4)

Country Link
US (1) US20180209450A1 (fr)
EP (1) EP3324723A1 (fr)
BR (1) BR112018001393A2 (fr)
WO (1) WO2017016544A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022124969A1 (de) * 2022-09-28 2024-03-28 Deere & Company Anordnung zur Steuerung eines hydraulischen Dreipunkt- Krafthebers
DE102022124970A1 (de) * 2022-09-28 2024-03-28 Deere & Company Anordnung zur Steuerung eines hydraulischen Dreipunkt- Krafthebers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905425A (en) * 1972-12-26 1975-09-16 Carl D Jackson Hydraulic stabilizer for limiting movement
DE102007017784B4 (de) * 2007-04-16 2009-02-26 Agco Gmbh Hydraulischer Oberlenker mit Schwimmstellung
US8001751B2 (en) * 2007-09-14 2011-08-23 Cnh America Llc Method for gradually relieving pressure in a hydraulic system utilizing reverse fluid flow through a pump of the system
FR2933569B1 (fr) * 2008-07-08 2012-12-21 Kuhn Huard Sa Bielle superieure perfectionnee pour l'attelage d'une machine agricole a un tracteur

Also Published As

Publication number Publication date
BR112018001393A2 (pt) 2018-09-11
US20180209450A1 (en) 2018-07-26
WO2017016544A1 (fr) 2017-02-02

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