EP1997960A2 - Arm für einen Frontlader - Google Patents
Arm für einen Frontlader Download PDFInfo
- Publication number
- EP1997960A2 EP1997960A2 EP08008077A EP08008077A EP1997960A2 EP 1997960 A2 EP1997960 A2 EP 1997960A2 EP 08008077 A EP08008077 A EP 08008077A EP 08008077 A EP08008077 A EP 08008077A EP 1997960 A2 EP1997960 A2 EP 1997960A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- linkage
- section
- front loader
- rocker
- recess
- 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.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 35
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000007704 transition Effects 0.000 claims description 13
- 238000010276 construction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
- E02F3/3405—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism
- E02F3/3408—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism of the parallelogram-type
Definitions
- the present invention relates to a linkage for a front loader.
- the linkage is formed by an oblong power transmission section and by two coupling elements, which are provided on the ends of the oblong power transmission section in each case.
- Front loaders are used particularly with agricultural vehicles, such as for example traction engines or farm tractors.
- a front loader is formed by two parallel-running front loader rockers, which are connected together by a tie bar, wherein on the proximal end, that is to say the end attached to the vehicle, of the front loader rockers in each case, an attachment bracket is provided for mounting onto the vehicle.
- a tool holder is pivotally linked for attaching a tool, such as a bucket for example.
- the front loader rockers are formed with a kink, the proximal section of the front loader rocker being described as the upper rocker spar and the distal section as the lower rocker spar.
- a tipping hydraulic cylinder is provided on each front loader rocker, which runs substantially parallel to the lower rocker spar and with a first end is linked to the tool holder.
- the second end of the tipping hydraulic cylinder is linked to an elbow lever, which in turn is pivotally linked in the vicinity of the kink to the front loader rocker.
- a linkage which with a first end is linked to the elbow lever and with the second end is linked to the attachment bracket, is provided for transmitting power between tool holder and attachment bracket.
- the linkage in this case is conventionally formed as a substantially linear-running component, which on its two ends in each case has coupling elements for linking to the elbow lever and the attachment bracket.
- the tipping hydraulic cylinder and - in the case of an arrangement with top lying linkage - the linkage each run above the lower or the upper rocker spar.
- the hydraulic cylinder runs substantially parallel to the lower rocker spar and the linkage runs substantially parallel to the upper rocker spar.
- the two coupling points of the lifting hydraulic cylinder and the linkage to the elbow lever are each arranged at the kink on the same side in relation to a (lower) third coupling point of the elbow lever, so that the three coupling points substantially form a triangle. This configuration is known below as an "arrangement with top lying linkage".
- a lifting hydraulic cylinder is provided respectively on each front loader rocker, which with a first end is linked to the attachment bracket and with a second end to the front loader rocker in the vicinity of the kink.
- the lifting hydraulic cylinder in this case runs underneath and substantially parallel to the upper rocker spar.
- the front loader is raised or lowered by the two lifting hydraulic cylinders.
- the two lifting hydraulic cylinders and tipping hydraulic cylinder of the front loader in this case are operated by the vehicle hydraulics and adjustment of these hydraulic cylinders is controlled from the driver's seat.
- the arrangement of the tipping hydraulic cylinder, the elbow lever, the linkage and the lifting hydraulic cylinder on the respective front loader rocker, and in particular their coupling points, is selected in such a manner that when the front loader is raised or lowered by means of the lifting hydraulic cylinder, the position of the tool mounted on the tool holder relative to the contact plane of the vehicle, that is to say the ground, is virtually not changed when the position of the tipping hydraulic cylinder is unchanged.
- This arrangement is also called parallel guide. When such a parallel guide is implemented, the front loader can be raised or lowered accordingly, without the previously adjusted position of the tool relative to the contact plane being changed to any large degree.
- the two attachment brackets of the front loader are normally mounted on both sides in the area between the front wheels and the vehicle cab in each case on a prefabricated section of the vehicle connected to the vehicle chassis.
- the attachment bracket in this case is arranged very close to the vehicle cab and thus to the windshield of the vehicle cab.
- the front loader is raised, accordingly the upper rocker spars of the front loader run very close in front of the vehicle cab.
- the vehicle cab normally has a hinged windshield, which is opened by lifting upwards and outwards. In this case it is often necessary to open the windshield of the vehicle cab and at the same time to hold the front loader in the raised position.
- the driver has to open the windshield in order to communicate with persons outside the vehicle, for example to instruct the driver when manoeuvring in tight environments or due to a vision-obscuring load on the front loader.
- the windshield must be opened since it is often heavily misted up when driving through farmyards, regardless of the momentary position of the front loader.
- opening of the windshield is obstructed by the linkage (with raised front loader) passing directly in front of the windshield.
- the object of the present invention consists in providing a front loader and more particularly a linkage for a front loader in such a manner that, particularly in the case of compact vehicles, the windshield of the vehicle cab can also be opened with a raised front loader.
- a linkage for a front loader which comprises an oblong power transmission section and two coupling elements, which are provided on the ends of the oblong power transmission section in each case.
- the linkage is formed by an oblong power transmission section and two coupling elements, which are provided on the ends of the oblong power transmission section in each case.
- the oblong power transmission section along its longitudinal direction has a recess section and at least one linear section adjoining it, wherein the linear section extends substantially linearly along a connecting line between the two coupling elements, and wherein the recess section is curved in such a manner that it is recessed in the vicinity of the connecting line and extends laterally offset from the connecting line in an extension, as a result of which power is transmitted via the extension in the vicinity of the recess section.
- the recess section can be curved in such a manner that the extension, in a mounted linkage position, extends towards the upper rocker spar of the associated front loader rocker so that additional free space between the front loader and the windshield of the vehicle cab is created in the vicinity of the recess section.
- the arrangement and dimensioning of the recess section can be adapted to the dimensions of a vehicle in such a manner that the recess section, in the mounted condition of the front loader, is located in the pivoting range of the windshield, over which the windshield is pivoted for opening.
- the extension has two extension faces running substantially parallel to each other, which run substantially parallel to the connecting line and which extend laterally away from the connecting line.
- the dimensions of the extension or the two extension faces can be adapted in such a manner that the extension extends on both sides of the upper rocker spar and overlaps the upper rocker spar.
- both of the extension faces preferably extend on both sides of the upper rocker spar and overlap the upper rocker spar.
- the dimensions of the recess can be adapted in such a manner that the recess, in the mounted condition of the linkage, extends diagonally to the connecting line substantially to an upper rocker spar of the front loader.
- linear sections are provided on both sides of the recess section, so that the power transmission section substantially extends along the linear connecting line between the two coupling elements and only has a curve in the vicinity of the recess section. This is advantageous for the transmission of power.
- the at least one linear section is formed by a profile rod with U-shaped cross section, so that high stability of the linear section is ensured. Furthermore such a U-shape for the linear section, in the transition area between linear section and recess section, enables both sides of the U-shaped profile rod to change into the two extension faces of the extension or, in this transition area, the two extension faces to be joined in each case to the exterior of the two sides of the U-shaped profile rod. Thus, the transition area between linear section and recess section is created so as to be particularly stable.
- the front loader rocker in this case likewise comprises an upper and a lower rocker spar, an attachment bracket, a tool holder, an elbow lever, a tipping hydraulic cylinder and a lifting hydraulic cylinder, as is explained above with respect to the prior art.
- an agricultural vehicle which has a front loader with two rocker spars, as explained above, wherein the recess of the linkage is arranged in such a manner that a windshield of the vehicle can also be opened unhindered with a raised front loader.
- the linkage and particularly the arrangement and design of the recess section should be adapted accordingly to the dimensions of the remaining parts of the front loader and to the dimensions of the vehicle, in particular the vehicle cab with the pivoting windshield.
- the recess section should be formed in such a manner that, in the mounted condition of the front loader and with a raised front loader, the recess of the recess section is located in the pivoting range of the windshield of the vehicle cab so that the windshield can be opened unhindered.
- the directional indications such as for example "top, bottom etc.” used in the preceding and following description, relate to a mounted position of the linkage according to the invention and to a reference system of a driver sitting in the vehicle. These directional indications are not to be interpreted in a restrictive way with regard to the arrangement of the linkage.
- the linkage 2 is formed by two coupling elements 4 and 6, which in each case are designed as mounting lugs, and by an oblong power transmission section 8, which extends between the two coupling elements 4, 6 and is rigidly connected to these.
- the oblong power transmission section 8 has a recess section 10 and a linear section 12, 14 on both sides of the recess section 10 in each case.
- the two linear sections 12, 14 each extend substantially linearly along a connecting line 16 between the two coupling elements 4 and 6.
- the connecting line 16 in Fig. 2 and Fig. 3 is drawn as a dash-dotted line and in each case extends from the centre of the mounting lug of the one coupling element 4 to the centre of the mounting lug of the other coupling element 6.
- the recess section is curved in such a manner that it has a recess 18 in the vicinity of the connecting line 16 and extends laterally offset from the connecting line 16 in an extension 20.
- the extension 20 is coupled to the two linear sections 12, 14 in such a manner that power is transmitted between the two coupling elements 4 and 6 via the two linear sections 12 and 14 and the extension 20.
- the two linear sections are formed by a profile rod with U-shaped cross section, wherein in the present exemplary embodiment the U-shape is expanded to the open end of the U.
- the longer linear section 12 has a wall thickness in the range of substantially 7 to 9 mm, more preferably in the range of substantially 7.5 to 8.5 mm.
- the shorter linear section 14 preferably has a wall thickness in the range of substantially 11 to 13 mm, more preferably in the range of 11.5 to 12.5 mm.
- the extension 20 in the exemplary embodiment illustrated is formed by two extension faces 22, 24 running substantially parallel to each other, which, as is evident on the basis of Fig. 2 and Fig. 3 , run substantially parallel to the connecting line 16 and extend laterally away from the connecting line 16.
- the wall thickness of the two extension faces 22, 24 preferably lies in a range of substantially 7 to 9 mm, more preferably in the range of substantially 7.5 to 8.5 mm.
- the two extension faces 22, 24 are joined in each case to the exterior of the two sides 30, 32 of the U-shaped profile rod of the respective linear section 12, 14.
- the entire linkage 2 is formed from steel and the extension faces 22, 24 are joined to the two sides 30, 32 by welding.
- the end of the profile rods of the two linear sections 12, 14 is tapered and forms an edge running diagonally downwards.
- the two extension faces 22, 24 also have an edge similarly descending diagonally in the transition areas 26, 28.
- a base 34 of the U-shaped profile rods of the two linear sections 12, 14 continues within these two transition areas 26, 28 in each case in a cover plate 36, which runs along the diagonally descending edges of the extension faces 22, 24 and the sides 30, 32 and extends between the two extension faces 22, 24.
- the cover plates 36 each terminate before reaching the deepest point of the recess 18.
- the two extension faces 22, 24 run substantially parallel to the connecting line 16, as is evident on the basis of Fig. 2 .
- the recess 18 preferably has a depth t in the range of substantially 70 to 85 mm, more preferably in the range of substantially 75 to 79 mm.
- the depth t in this case is measured between the upper end of the two linear sections 12 and 14 and the deepest point of the recess 18, as illustrated in Fig. 2 .
- the distance T between the upper end of the linear sections 12, 14 and the lower end of the two extension faces 22, 24 preferably lies in the range of substantially 190 to 210 mm, more preferably in the range of substantially 195 to 205 mm.
- the depth t and the distance T in this case are measured perpendicularly to the connecting line 16.
- the distance between the two opposite faces increases in the transition areas 26, 28 so that the distance between the extension faces 22, 24, in the vicinity of the recess section 10, is greater than the distance between the sides 30, 32 of the U-shaped profile rod in the vicinity of the linear sections 12, 14.
- Fig. 7 illustrates a front loader rocker 38 of a front loader with a linkage 2 according to the invention in side view.
- the linkage 2 in this case is formed in such a manner as described with reference to Figs. 1 to 6 .
- the front loader rocker 38 has a rocker spar 40, which is curved in the vicinity of a kink 42 and is divided by this into an upper rocker spar 44 and a lower rocker spar 46.
- a connecting element 48 is arranged in the vicinity of the kink 42.
- an attachment bracket 50 is linked to a fulcrum 52.
- the attachment bracket 50 serves to secure the front loader rocker 38 to a vehicle.
- a tool holder 54 is pivotally linked by means of a fulcrum 56. This serves to attach a tool (not illustrated), such as for example a bucket.
- a tool such as for example a bucket.
- an elbow lever 58 can be pivoted about a fulcrum 60 onto the rocker spars 44, 46 or onto the connecting element 48 connected thereto.
- the elbow lever 58 in this case is arranged on the side of the rocker spars 44, 46, to which the apex of the kink points in the vicinity of the kink 42, which in a mounted position of the front loader rocker 38 corresponds to the upper side.
- a lifting hydraulic cylinder 62 which with a first end is pivotally linked to the attachment bracket 50 and with the second end is pivotally linked to the rocker spars 44, 46 in the vicinity of the kink 42, in particular to the connecting element 48, is provided underneath the upper rocker spar 44.
- the lifting hydraulic cylinder 62 serves to raise and lower the front loader rocker 38.
- a tipping hydraulic cylinder 64 is provided in the vicinity of the lower rocker spar 46, which is linked by means of a bearing 66 to the tool holder 54 and with its second end is linked by means of a bearing 68 to the elbow lever 58.
- the tipping hydraulic cylinder 64 in this case runs above the lower rocker spar 46 and on the same side of the rocker spars 44 and 46 as the elbow lever 58.
- a linkage 2 which with a first end is linked by means of a bearing 70 to the elbow lever 58 and with a second end is linked by means of a bearing 72 to the attachment bracket 50, is provided.
- the two coupling points 68 and 70 of the two bearings of the tipping hydraulic cylinder 64 and the linkage 2 are arranged on the same side of the connecting element 48 in relation to a coupling point 60 of the elbow lever 58.
- the three coupling points 60, 68 and 70 are configured in the shape of a triangle on the elbow lever 58.
- the configuration illustrated is an arrangement with a top lying linkage 2.
- the dimensions of the extension 20, and in particular the extension faces 22, 24, are adapted in such a manner that the extension 20 extend on both sides of the upper rocker spar 44 and overlap the upper rocker spar 44.
- the dimensions of the recess 18 are adapted in such a manner that the recess extends substantially up to the upper rocker spar 44.
- the upper ends of the extension faces 22, 24 in the vicinity of the deepest point of the recess 18 are substantially flush with the upper end of the upper rocker spar 44.
- the space between the front loader rocker 38 and a vehicle cab (not illustrated) is not additionally restricted by the linkage 2. This is also evident on the basis of the cross sectional view in Fig. 10 .
- the U-shaped profile rod of the linear section 12 runs above the upper rocker spar 44.
- Figs. 11 - 13 show a front loader, which has two front loader rockers 38, as described with reference to Figs. 7 to 10 .
- the two front loader rockers are formed in mirror-image and connected together by a tie bar 76.
- the tie bar 76 extends between the two lower rocker spars 46 of the two front loader rockers 38.
- Fig. 14 illustrates part of a vehicle cab 78 of a tractor 80.
- a front loader 74 as explained above with reference to Figs. 11 - 13 , is mounted on the tractor 78.
- the front loader 74 in this case is in a raised condition.
- a windshield 82 which is hinged on the vehicle cab 78, due to provision of the linkage 2 according to the invention, can be opened without this pivot movement being obstructed by the linkage 2.
- the windshield 82 can also be opened accordingly with a raised front loader 74 and also in the case of compact vehicles.
- the recess section 10 of the linkage 2 in this case is located in the area, in which the windshield 82 during its pivot movement approaches closest to the front loader 74.
- the present invention is not limited to the arrangements shown in the exemplary embodiments. More particularly, provision of a recess section is also in principle possible with a bottom lying linkage, which is employed in the case of z-kinetics.
- the design of the coupling elements of the linkage as mounting lugs is not absolutely essential.
- the coupling elements are only to make pivotal connection of the linkage 2 possible.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710024468 DE102007024468A1 (de) | 2007-05-25 | 2007-05-25 | Zugstange für einen Frontlader |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1997960A2 true EP1997960A2 (de) | 2008-12-03 |
EP1997960A3 EP1997960A3 (de) | 2017-03-15 |
EP1997960B1 EP1997960B1 (de) | 2019-01-02 |
Family
ID=39708312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08008077.3A Active EP1997960B1 (de) | 2007-05-25 | 2008-04-26 | Arm für einen Frontlader |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1997960B1 (de) |
DE (1) | DE102007024468A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016084617A (ja) * | 2014-10-24 | 2016-05-19 | ヤンマー株式会社 | 作業車両 |
CN106049578A (zh) * | 2016-08-09 | 2016-10-26 | 雷沃重工股份有限公司 | 一种装载机工作装置用的新型长拉杆结构及装载机 |
EP3610077A4 (de) * | 2018-01-26 | 2021-01-06 | Guangxi LiuGong Machinery Co., Ltd. | Hebeanordnung für radlader |
WO2022005371A1 (en) * | 2020-07-01 | 2022-01-06 | Ålö AB | A front loader for a working vehicle and a working vehicle |
WO2023139893A1 (ja) * | 2022-01-19 | 2023-07-27 | 株式会社クボタ | フロントローダの姿勢維持機構及びフロントローダ |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2928278A1 (de) * | 1979-07-13 | 1981-01-29 | Stoll Maschf Gmbh Wilhelm | Front- oder hecklader |
JP3446847B2 (ja) * | 1994-11-08 | 2003-09-16 | 株式会社小松製作所 | 作業車両 |
US7568878B2 (en) * | 2005-07-22 | 2009-08-04 | Frey Industries Limited | Loader boom arm |
-
2007
- 2007-05-25 DE DE200710024468 patent/DE102007024468A1/de not_active Ceased
-
2008
- 2008-04-26 EP EP08008077.3A patent/EP1997960B1/de active Active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016084617A (ja) * | 2014-10-24 | 2016-05-19 | ヤンマー株式会社 | 作業車両 |
CN106049578A (zh) * | 2016-08-09 | 2016-10-26 | 雷沃重工股份有限公司 | 一种装载机工作装置用的新型长拉杆结构及装载机 |
CN106049578B (zh) * | 2016-08-09 | 2018-08-24 | 青岛雷沃工程机械有限公司 | 一种装载机工作装置用的新型长拉杆结构及装载机 |
EP3610077A4 (de) * | 2018-01-26 | 2021-01-06 | Guangxi LiuGong Machinery Co., Ltd. | Hebeanordnung für radlader |
WO2022005371A1 (en) * | 2020-07-01 | 2022-01-06 | Ålö AB | A front loader for a working vehicle and a working vehicle |
WO2023139893A1 (ja) * | 2022-01-19 | 2023-07-27 | 株式会社クボタ | フロントローダの姿勢維持機構及びフロントローダ |
Also Published As
Publication number | Publication date |
---|---|
EP1997960B1 (de) | 2019-01-02 |
DE102007024468A1 (de) | 2008-11-27 |
EP1997960A3 (de) | 2017-03-15 |
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