EP4346365A1 - Dispositif d'accouplement pour une liaison inférieure d'un attelage trois points - Google Patents

Dispositif d'accouplement pour une liaison inférieure d'un attelage trois points

Info

Publication number
EP4346365A1
EP4346365A1 EP22727345.5A EP22727345A EP4346365A1 EP 4346365 A1 EP4346365 A1 EP 4346365A1 EP 22727345 A EP22727345 A EP 22727345A EP 4346365 A1 EP4346365 A1 EP 4346365A1
Authority
EP
European Patent Office
Prior art keywords
locking
coupling
coupling device
fastening area
locking bar
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.)
Pending
Application number
EP22727345.5A
Other languages
German (de)
English (en)
Inventor
Martin Heitlinger
Mario Patino
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP4346365A1 publication Critical patent/EP4346365A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • A01B59/061—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors specially adapted for enabling connection or disconnection controlled from the driver's seat
    • A01B59/062—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors specially adapted for enabling connection or disconnection controlled from the driver's seat the connection comprising a rigid interface frame on the tractor
    • 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
    • A01B59/002—Details, component parts
    • A01B59/006—Latched hooks
    • 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)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/01—Traction couplings or hitches characterised by their type
    • B60D1/04—Hook or hook-and-hasp couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D2001/001—Traction couplings; Hitches; Draw-gear; Towing devices specially adapted for use on vehicles other than cars
    • B60D2001/008—Traction couplings; Hitches; Draw-gear; Towing devices specially adapted for use on vehicles other than cars specially adapted for implements, e.g. towed tools

Definitions

  • the invention relates to a coupling device for a lower link of a three-point power lift, comprising a coupling body with a catch hook for receiving a coupling element that is designed to complement a fastening area of the catch hook along a defined receiving direction, and a locking mechanism with a locking latch that is activated under the action of a spring force is pushed into a locking position blocking the catch hook, so that a coupling element to be accommodated by the fastening area can be locked in the catch hook.
  • Such lower link hooks are offered by various manufacturers and usually have a locking mechanism with a locking latch that engages sideways and upwards in the catch hook, which moves against a restoring spring force when a coupling ball included in an attachment interface is coupled into a coupling ball that releases the catch hook can move the coupling position. As soon as the coupling ball has reached its end position, the locking bolt snaps back into its original position while the catch hook is blocked at the same time.
  • the coupling device for a lower link of a three-point power lift comprises a coupling body with a catch hook for receiving a coupling element designed to complement a fastening area of the catch hook along a defined receiving direction, and a locking mechanism with a locking latch which, under the action of a spring force, moves into a locking position locking the catch hook is pushed, so that a coupling element to be taken up by the fastening area can be locked in the catch hook.
  • the locking bar is mounted in a longitudinally displaceable manner in a slide guide provided on the coupling body in such a way that it moves out of the locking position exclusively perpendicular to the specified receiving direction, releasing the fastening area can be deflected, with the locking bar being in the locking position protruding beyond the fastening area in the specified receiving direction by more than half, blocking it.
  • the locking bar extends accordingly beyond the apex point facing the locking bar in the receiving direction.
  • the lower link is part of a conventional three-point linkage on an agricultural tractor.
  • there are left and right lower links which run symmetrically to one another and are each equipped with the clutch device according to the invention.
  • the two lower links are articulated in a lower area of a rear differential housing of the agricultural tractor and can be raised and lowered by means of a hydraulic hoist at the instigation of an operator. If double-acting hydraulic cylinders are used to actuate the hydraulic lifting gear, it is also easily possible due to the properties of the locking mechanism described above to exert a downward force on the ground via the two lower links on a tillage implement attached thereto. This is important insofar as the catch hooks on the lower links move upwards open, which means that almost the entire force applied is exerted on the coupling elements of the attachment interface via the locking latch or the locking mechanism.
  • a planar contact contour facing the fastening area is preferably formed on the locking bar, which in particular runs parallel to the deflection direction of the locking bar.
  • Such a contact contour offers a particularly small contact surface for operational movements of a coupling element located in the fastening area. The possibility of the locking bar being pushed open in the event that the coupling element has increased bearing play within the fastening area can thus be further reduced.
  • a projection extending over the fastening area along the planar contact contour can also be provided as a mechanical hindrance.
  • a concave contact contour facing the fastening area can be formed on the locking bar, which corresponds in particular to an outer curvature of a coupling element to be accommodated.
  • the latter particularly takes into account the case in which the coupling element is a coupling ball. If the coupling ball is in contact with the concave contact contour, the coupling ball will block the locking bar from being pushed open by the rising edge of the concave contact contour.
  • the locking bar it is also possible for the locking bar to beveled at one end in the receiving direction in such a way that it can be pushed into a coupling position releasing the fastening area when the coupling ball is inserted.
  • the slide guide may be formed inside a housing provided on an upper side of the coupling body.
  • the sliding guide can be a shaft-shaped recess running in the housing, in which the locking bar is guided in a longitudinally displaceable manner along a slide-shaped section.
  • the housing has a box-like shape and is an integral part of the coupling body.
  • a one-piece design can also be limited to a housing shell which is open at the side and which can be covered by welding on a separate housing cover.
  • Both the clutch body and the box-shaped housing are manufactured as forged steel parts.
  • the housing In order to be able to replace the locking latch and other components of the locking mechanism in the event of wear or a defect, it is conceivable for the housing to have an access opening that can be closed by means of a removable maintenance cover.
  • the locking mechanism is preferably located as an insert that can be pulled out along the sliding guide in the housing and can be removed from this as a whole when the maintenance cover is removed.
  • aligned bores for receiving a safety bolt extend through opposite cheeks of the housing in such a way that a deflection of the locking bolt from the locking position can be blocked by means of the safety bolt.
  • Zen in the fuse bolt is usually a screw that can be secured by a nut at its protruding from the housing the open end by means of a nut after being pushed through.
  • the sliding guide can have an elastic stop element for limiting longitudinal displacement of the locking bar in the direction of the locking position.
  • the elastic stop element is, for example, an elastomer strip inserted into an internal groove in the housing.
  • a pulling lever can be attached to the locking bar, by means of which the locking bar can be manually deflected out of the locked position by the operator.
  • the pull lever or a handpiece formed on it extends outwards through a rear outlet opening provided on the housing.
  • the rear outlet opening can be formed in particular in the maintenance cover mentioned above.
  • a latching device can be formed on the pull lever, by means of which the locking bar can be locked in a coupling position releasing the fastening area.
  • the latching device is a recess formed along the pull lever and which can be hung in an edge of the rear outlet opening.
  • the lock allows both locking latches to be moved into the coupling position at the same time, so that the coupling elements of an attachment interface to be attached to the three-point linkage can be more easily inserted into the catch hooks at the same time.
  • an eyelet for attaching an actuating cable is provided in an end area of the pull lever.
  • the actuating cable can in particular run in the direction of a rear window that can be opened up in a driver's cab of the agricultural tractor, so that the operator can conveniently operate the locking mechanism without leaving the driver's cab.
  • the locking latch it should be noted that it is also conceivable for the locking latch to be brought into the coupling position by external force.
  • an actuator in the form of a pneumatically or hydraulically controllable actuating cylinder, an electromotive actuator or an electromagnetic actuator can be assigned to the locking mechanism.
  • FIG. 1 shows a sectional view of an exemplary embodiment of the coupling device according to the invention with a locking bolt which is in a locking position blocking a catch hook
  • FIG. 2 shows a detailed view of a coupling element in the form of a coupling ball located in the catch hook
  • FIG. 3 shows the coupling device shown in FIG. 1, in which the locking bolt is deflected into a coupling position releasing the catch hook
  • FIG. 4 shows the locking latch shown in FIG. 3, which is locked in the coupling position releasing the catch hook by means of a locking device.
  • Fig. 1 shows an embodiment of the invention
  • the coupling device 10 comprises a coupling body 12 with a catch hook 14 for receiving a coupling element 18 with a fastening area 16 of the catch hook 14 of complementary design along a receiving direction 20 defined by the course of the opening of the catch hook 14 in the fastening area 16 welded in an end portion 22 of a conventional lower link 24, which is part of a non-ge showed three-point linkage of an agricultural tractor tor. More specifically, the three-point linkage has left and right lower link 24, which run symmetrically to each other ver and are each equipped with the coupling device 10 shown in FIG.
  • a coupling element 18 designed as a coupling ball 26, which can be connected to an attachment interface (not shown) of a soil cultivation device, such as a plough, a harrow or a seed drill, or a supported attachment in the form of a fertilizer spreader, a spray boom, or the like is included.
  • a soil cultivation device such as a plough, a harrow or a seed drill, or a supported attachment in the form of a fertilizer spreader, a spray boom, or the like is included.
  • the coupling device 10 has a locking mechanism 28 with a locking bar 30 made of hardened steel.
  • the locking latch 30 is pushed under the action of a spring force into a locking position 32 blocking the catch hook 14, so that the coupling ball 26 located in the fastening area 16 is locked in the catch hook 14.
  • the locking latch 30 is mounted in a longitudinally displaceable manner in a slideway 34 provided on the coupling body 12 such that it can be deflected from the locking position 32 exclusively perpendicularly to the specified receiving direction 20 while releasing the fastening area 16 .
  • the locking latch 30 located in the locking position 32 protrudes beyond the fastening area 16 in the fixed receiving direction 20, blocking it by more than half. If, as here, it is a coupling element 18 configured as a hitch ball 26, that means This means that the locking bar 30 extends beyond the vertex 38 facing the locking bar 30 in the receiving direction 20 .
  • the fastening bar 30 has a concave contact contour 38 facing the fastening area 16 that corresponds to an outer curvature of the coupling ball 26 located in the fastening area 16 . If the coupling ball 26 is in contact with the concave contact contour 38 , the locking bar 30 is blocked by the coupling ball 26 from being pushed open by the rising edge 40 of the concave contact contour 38 .
  • the coupling ball 26 has a specific bearing play Ad within the fastening area 16 . This is on the order of 2 to 3 millimeters. This enables a contamination-tolerant "form fit" between the coupling ball 26 and the locking bar 30, which ensures problem-free opening and closing of the locking mechanism 28 even under adverse conditions.
  • the concave contact contour 38 is omitted, so that the locking bar 30 forms a planar contact contour that faces the fastening area 16 and runs parallel to the deflection direction 42 of the locking bar 30 .
  • a projection extending over the fastening area 16 along the flat contact contour is additionally provided as a mechanical obstacle.
  • the locking latch 30 is beveled at one end 44 lying in the receiving direction 20 in such a way that when the coupling ball 26 is inserted, it is pushed into a coupling position 46 that releases the catch hook 14 or the fastening area 16 . This condition is shown in FIGS. 3 and 4, respectively.
  • the locking bar 30 automatically returns to its locking position 32 under the action of the restoring spring force. In this way, a snap closure is realized that allows the coupling process to be carried out particularly conveniently with an attachment interface.
  • the sliding guide 34 is formed within a housing 50 provided on an upper side 48 of the coupling body 12 .
  • the sliding guide 34 is a shaft-shaped recess 52 which runs in the housing 50 and in which the locking bar 30 is guided in a longitudinally displaceable manner along a slide-shaped section 54 .
  • the sliding guide 34 has an elastic stop element 56 for limiting a longitudinal displacement of the locking bar 30 in the direction of the locking position 32 .
  • the elastic stop element 56 is an elastomer strip 60 which is inserted into an internal housing groove 58 and on which the locking bar 30 rests in the locking position 32 with a projection 62 provided on the carriage-shaped section 54 .
  • the compressibility of the elastomer strip 60 is dimensioned such that it keeps the projection 62 out of contact with the adjacent housing section in the locking position 32 .
  • the locking bar 30 is so far clamped or stored under the action of the restoring spring force in the locking position 32 "floating".
  • the housing 50 has a box-like shape and is an integral part of the coupling body 12. More specifically, the one-piece construction is limited to a housing shell 64 which is open at the side and is formed on the coupling body 12 and which is covered by welding on a separate housing cover 66.
  • the housing cover 66 is only partially indicated in FIGS. 1, 3 and 4 in order not to cover the components of the locking mechanism 28 located underneath.
  • Both the clutch body 12 and the housing 50 are manufactured as forged steel parts.
  • the spring force is built up by means of a helical compression spring 68, which is received with a first end 70 in a blind hole 72 formed on the inside of the locking bar 30 and with a second end 74 a maintenance cover 76 of the housing 50 is supported.
  • a guide rod 78 attached to the maintenance cover 76 runs inside the compression spring 68 and ensures that the compression spring 68 is compressed without kinks when the locking latch 30 is moved in the direction of the hitch position 46 .
  • a pull lever 80 is attached to the locking bar 30, by means of which the locking bar 30 can be manually deflected out of the locking position 32 by the operator.
  • This operating state is shown in FIG.
  • the pull lever 80 or a handpiece 82 formed thereon extends outwards through an outlet opening 84 provided in the maintenance cover 76 .
  • a latching device 86 is formed on the pull lever 80, by means of which the locking latch 30 can be locked in the coupling position 46.
  • the latching device 86 is a stepped recess 88 formed along the pull lever 80 and which can be hung in an edge 90 of the outlet opening 84 on the maintenance cover 76 .
  • This Actuate supply state is shown in FIG.
  • the course of the coupling process can also be seen in FIGS. 3 and 4, in that the coupling ball 26 is inserted into the catch hook 14 when the locking mechanism 28 is open.
  • the catch hook 14 has a mouth-shaped receiving area 92 for centering the coupling ball 26, which then merges into the actual fastening area 16.
  • the coupling ball 26 is complementary to the attachment area 16, except for a predetermined bearing clearance Ad. Due to the course of the opening of the catch hook 14 in the fastening area 16, the coupling ball 26 is guided along the fixed receiving direction 20.
  • an eyelet 94 is provided with an actuating cable 96 attached there ran in one end area of the pull lever 80 .
  • the actuating cable 96 runs in the direction of a hinged rear window of a driver's cab of the agricultural tractor, so that the operator can conveniently operate the locking mechanism 28 without leaving the driver's cab.
  • the maintenance cover 76 can be removed after several clamping sleeves 98 have been removed, revealing a rear access opening 100 that allows the locking latch 30 along with other components of the locking mechanism 28, including the compression spring 68, the pull lever 80 and the Elasto merst Shape 60 to exchange in the event of wear or defects.
  • the locking mechanism 28 is located in the housing 50 as an insert that can be pulled out along the sliding guide 34 and can be removed as a whole through the access opening 100 when the maintenance cover 76 is removed.
  • Bores 102 aligned with one another for receiving a safety bolt extend through opposite cheeks of the housing 50 in such a way that a deflection of the locking bolt 30 out of the locking position 32 can be blocked by means of the safety bolt. If the safety bolt is inserted through the bores 102, the water rests against the rear face 104 of the locking bolt 30 and prevents it from moving out of the locking position 32.
  • the securing bolt is usually a screw which, after it has been pushed through, can be secured by means of a nut at its open end protruding from the housing 50 .
  • a drainage opening 106 for liquid drainage is formed in the housing 50 for draining water penetrating into the closure mechanism 28 .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Zoology (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Transportation (AREA)
  • Agricultural Machines (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

L'invention concerne un dispositif d'accouplement (10) pour une liaison inférieure (24) d'un attelage trois points, le dispositif comprenant un corps d'accouplement (12) avec un crochet d'arrêt (14) destiné à recevoir un élément d'accouplement (18) le long d'une direction de réception définie (20), l'élément d'accouplement étant conçu pour être complémentaire à une zone de fixation (16) du crochet d'arrêt (14), et comprenant également un mécanisme de verrouillage (28) avec un loquet de verrouillage (30) qui est poussé par une force de ressort dans une position de verrouillage (32), dans laquelle le crochet d'arrêt (14) est verrouillé, auquel cas un élément d'accouplement (18) destiné à être reçu par la région de fixation (16) peut être bloqué dans le crochet d'arrêt (14). Le loquet de verrouillage (30) est monté de façon à pouvoir être déplacé longitudinalement dans un guide coulissant (34) disposé sur le corps d'accouplement (12), de telle sorte qu'il puisse être dévié hors de la position de verrouillage (32) exclusivement perpendiculairement à la direction de réception définie (20), libérant ainsi la région de fixation (16), tandis que, dans la position de verrouillage (32), le loquet de verrouillage (30) atteint plus de la moitié de la région de fixation (16) dans la direction de réception définie (20), ce qui permet d'effectuer une fonction de verrouillage.
EP22727345.5A 2021-05-25 2022-05-05 Dispositif d'accouplement pour une liaison inférieure d'un attelage trois points Pending EP4346365A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021113462.5A DE102021113462A1 (de) 2021-05-25 2021-05-25 Kupplungseinrichtung für einen Unterlenker eines Dreipunkt-Krafthebers
PCT/EP2022/062170 WO2022248186A1 (fr) 2021-05-25 2022-05-05 Dispositif d'accouplement pour une liaison inférieure d'un attelage trois points

Publications (1)

Publication Number Publication Date
EP4346365A1 true EP4346365A1 (fr) 2024-04-10

Family

ID=81927886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22727345.5A Pending EP4346365A1 (fr) 2021-05-25 2022-05-05 Dispositif d'accouplement pour une liaison inférieure d'un attelage trois points

Country Status (4)

Country Link
EP (1) EP4346365A1 (fr)
BR (1) BR112023019236A2 (fr)
DE (1) DE102021113462A1 (fr)
WO (1) WO2022248186A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230061461A1 (en) * 2021-08-27 2023-03-02 Cnh Industrial America Llc Locking system for a three-point hitch quick coupler

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2691932A (en) * 1951-09-24 1954-10-19 Ford Motor Co Quick-attaching tractor implement hitch
US2711679A (en) * 1952-06-30 1955-06-28 Ford Motor Co Quick attachable tractor-implement linkage
DE2638904C2 (de) * 1976-08-28 1978-10-26 Jean Walterscheid Gmbh, 5204 Lohmar Oberlenker einer Dreipunktanbauvorrichtung zum Anbau von Arbeitsgeräten an einen Ackerschlepper
FI106522B (fi) * 1998-08-21 2001-02-28 Paavo Antero Viikki Erityisesti traktorin kolmipistekiinnityksen vetovarren kytkinkoura
US7059419B2 (en) * 2003-04-25 2006-06-13 Owen Patrick Greenwell Tractor hitch lift arm adaptor
US9736976B2 (en) * 2014-11-07 2017-08-22 Agco Corporation Windrower with quick header attachment

Also Published As

Publication number Publication date
DE102021113462A1 (de) 2022-12-01
BR112023019236A2 (pt) 2023-12-12
WO2022248186A1 (fr) 2022-12-01

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