EP1389250A1 - Excavatrice sur roues - Google Patents

Excavatrice sur roues

Info

Publication number
EP1389250A1
EP1389250A1 EP02753058A EP02753058A EP1389250A1 EP 1389250 A1 EP1389250 A1 EP 1389250A1 EP 02753058 A EP02753058 A EP 02753058A EP 02753058 A EP02753058 A EP 02753058A EP 1389250 A1 EP1389250 A1 EP 1389250A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
articulated
wheel loader
tilt cylinder
cross tube
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Withdrawn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
EP02753058A
Other languages
German (de)
English (en)
Inventor
Josef Stock
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.)
Liebherr Werk Bischofshofen GmbH
Original Assignee
Liebherr Werk Bischofshofen 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
Priority claimed from DE20108606U external-priority patent/DE20108606U1/de
Priority claimed from DE20111768U external-priority patent/DE20111768U1/de
Application filed by Liebherr Werk Bischofshofen GmbH filed Critical Liebherr Werk Bischofshofen GmbH
Publication of EP1389250A1 publication Critical patent/EP1389250A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/422—Drive systems for bucket-arms, front-end loaders, dumpers or the like
    • 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
    • E02F3/30—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 a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/308—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 a dipper-arm pivoted on a cantilever beam, i.e. boom working outwardly
    • 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
    • E02F3/3411—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 Z-type

Definitions

  • the invention relates to a wheel loader with a mast with Z-kinematics, which consists of a device arm with a lifting cylinder articulated on the vehicle frame or the front end and a rocker-like deflection lever articulated on the device arm, at the ends of which the tilting cylinder and the connecting link are articulated for pivoting the attachment, exist, attachments to the mast, e.g. a grave vessel or a log grapple can be attached.
  • the device arm 1 is H-shaped, the parallel side supports being connected at their inner ends by joints 2 to the front end, which is usually connected to the rear end by an articulated joint.
  • the front ends of the side supports are connected in an articulated manner by joints 3 to an attachment, in the exemplary embodiment shown a grave vessel 4.
  • the lateral supports are connected to one another in their central region by a cross tube 5 forming the H-web.
  • the cross tube 5 carries in its central region parallel cheeks 6 forming a bearing fork, between which the bell crank 7 of the Z-kinematics in the manner shown is stored.
  • the piston rod of the tilt cylinder 9 is articulated in the joint 8, which in turn is articulated to the front end by the joint 10.
  • the connecting tab 12 is articulated in the articulation 11, which is articulated through the articulation 13 to the attachment.
  • the device arm 1 can be pivoted about its joint 2 by the lifting cylinders 14, which are pivotally connected to the front end by the joints 15, while their piston rods are pivotably connected to the device arm 1 by the joints 16.
  • the tilting cylinder engages the deflection lever 7 with a large lever arm, so that the grave vessel can be pivoted easily about its pivot axis 3 on the implement arm.
  • this situation changes when the device arm is raised when the grave vessel 4 is to be pivoted between positions II and III.
  • the tilt cylinder 9 only engages the bell crank 7 with the lever arm a in the downwardly tilted position II of the digging vessel.
  • the effective lever arm b is enlarged, as can be seen from FIG. 8.
  • the object of the invention is therefore to provide a wheel loader of the type specified in the introduction, in which, without reinforcement of the tilt cylinder, a NEN position of the scaffolding allows the attachment to pivot with the required large moment from a downward tilted position to an upward tilted position.
  • this object is achieved in that at least one hydraulic cylinder is articulated to the lifting frame, the piston rod of which articulates on the pivot axis connecting the bellcrank with the tilt cylinder.
  • This hydraulic cylinder provided according to the invention forms a support cylinder which, when the mast is in the raised position, is able to pivot the attachment between its end positions with the required torque, without the tilting cylinder itself having to be reinforced.
  • the supporting hydraulic cylinder is expediently pressurized with pressure oil together with the tilt cylinder. This configuration ensures that the hydraulic cylinder always generates a supporting torque for pivoting the attachment upwards when the tilt cylinder is extended.
  • the attachment for example a log grapple
  • the attachment tends to fall into the downward position due to the force of gravity of the load.
  • the supporting hydraulic cylinder is connected as a damping cylinder when the tilting cylinder executes a movement that retracts the piston rod.
  • This damping effect is achieved in that the oil displaced from the supporting hydraulic cylinders is returned to the tank through the same line that also connects the tilt cylinder to the tank, so that the required throttling takes place in this line.
  • throttle valves for throttling the oil displaced from the supporting hydraulic cylinders which are switched on as required.
  • the supporting effect for the hydraulic cylinder is basically only required in a relatively small area, namely when the mast is swung up in the area in which when the attachment is tilted, the tilt cylinder only engages the bell crank with a relatively small lever arm.
  • the hydraulic cylinder is held to a limited extent on the lifting frame and the piston rod carries an open cup-shaped support bearing which disengages from the Deflecting lever with pivot axis connecting the tilt cylinder comes when, when the mast is raised and when the attachment is pivoted upwards, the tilt cylinder engages the deflection lever with a larger lever arm.
  • the cross tube is provided with bearing pieces for articulating the hydraulic cylinder.
  • two hydraulic cylinders are connected to the cross tube so as to be pivotable to a limited extent, the piston rods of which are connected to one another by a cross yoke which carries the support bearing.
  • the pivot axis, on which the piston rod of the tilting cylinder engages, can be extended laterally over the legs of the bearing fork connecting it to the deflection lever to form axle journals, with lateral journals connected to the transverse yoke acting on these axle journals.
  • each of the two hydraulic cylinders is connected to the cross tube by a U-shaped holding part, one leg of which is welded to the cross tube, the hydraulic cylinder being connected to the web part of the holding part about a pivot axis parallel to the cross tube and the legs on their inner sides with buffering stops are provided, between which the cylinders are pivotable.
  • the above description relates to a first embodiment of the invention, in which the piston rods or the support bearings of the supporting hydraulic cylinders carried by the piston rods temporarily come out of engagement with the pivot axis connecting the bell crank to the tilt cylinder.
  • the piston rods of the supporting hydraulic cylinders are articulatedly connected to the deflection lever in all swivel positions of the lifting frame or of the attachment.
  • This is achieved according to the invention in that one end of a link is articulated to the deflection lever or to a radial arm or a bearing arm of the cross tube connecting the lateral device arms in an H-shape, with the other end of which one side of a supporting hydraulic pressure-piston-cylinder unit is articulated is that the other end of the pressure-piston-cylinder unit is articulated on or in the vicinity of the swivel axis connecting the rocker arm to the tilt cylinder and that the handlebars for the purpose of supporting the tilt cylinder are temporarily extended when the pressure-piston-cylinder unit is extended on the cross tube supported.
  • This embodiment of the wheel loader according to the invention has the advantage over the first embodiment that the supporting hydraulic cylinder is permanently articulated on the one hand to the bell crank and on the other hand to the handlebar.
  • the handlebar is generally supported in the same swivel positions or operating situations on the cross tube as the piston rods or the support bearings carried by them on the deflection lever or the swivel axis connecting the deflection lever to the tilt cylinder.
  • the handlebar is expediently articulated on the pivot axis of the deflection lever, which is held by fork-shaped bearing legs connected to the cross tube.
  • two parallel links are mounted on both sides of the bell crank, which are connected to one another in a U-shape by a web part, the link or the web part being supported by two pressure medium-piston-cylinder units, the other ends of which are articulated with projecting axle journals that connect the bell crank to the tilt cylinder Swivel axis are articulated.
  • FIG. 1 is a side view of the mast with attached digging vessel with the supporting hydraulic cylinder according to the invention in a position that corresponds to position II of FIG. 8,
  • FIG. 2 shows a detail of FIG. 1 in the region of the bellcrank in an enlarged view
  • FIG. 3 shows a side view of the mast according to FIG. 1 in a position corresponding to position III in FIG. 8,
  • FIG. 4 shows an enlarged detail from FIG. 3 corresponding to FIG. 2,
  • FIG. 5 is a perspective view of the detail of the mast according to FIG. 2,
  • FIG. 6 is a perspective view of a section of the mast according to FIG. 4,
  • FIG. 7 is a perspective view of a section of the mast according to FIGS. 5 and 6 in a position in which the supporting hydraulic cylinders are disengaged
  • Fig. 8 shows a known mast with attached grave vessel in different positions I, II and III
  • Fig. 9-16 a second embodiment of the mast according to the invention with attached digging vessel in different positions, in which the supporting hydraulic cylinders are articulated on the one hand on a web part of a U-shaped, swing-shaped support part and on the other hand on the protruding axle pin of the pivot axis connecting the bell crank to the tilt cylinder ,
  • the lifting frame 1 shown in FIGS. 1 to 7 with attached digging vessel 4 corresponds to the known lifting frame with Z-kinematics according to FIG. 8, except for the supporting hydraulic cylinders provided according to the invention.
  • the rear ends of the side supports of the H-shaped device arm 1 are provided with aligned bearing bores 20, by means of which they are pivotably mounted on axle bolts of the front end.
  • holding parts 21 are welded on the side opposite the fork-shaped bearing cheeks 6 at a distance from one another and symmetrically to the transverse center plane of the device arm, which have U-shaped cutouts on their side facing the front end.
  • the U-shaped cutouts of the holding parts 1 have a narrow leg 22 pointing towards the front end and a wider leg 23 pointing towards the blade, which has a cutout corresponding to the contour of the cross tube 5 and is welded to the cross tube 5.
  • the supporting hydraulic cylinders 24, 25 are mounted in the U-shaped cutouts of the holding parts 21.
  • the hydraulic cylinders 24, 25 have forked legs 26 on their bottoms, which are provided with aligned bores and are pivotably mounted on bolts held in the web parts of the U-shaped holding parts 21.
  • cushioning rubber buffers 27 are fastened against which the hydraulic cylinders 24, 25, which can pivot through small angles in the U-shaped cutouts, are supported in their end positions.
  • the piston rods 28, 29 are connected in an articulated manner to a transverse yoke 30 which has cup-shaped support bearings 31 at its two ends.
  • the bolt supporting the piston rod 32 and in aligned bores of the cheeks 33 of the forked bearing of the deflection lever 7 is extended beyond the lateral bearing cheeks to form axle journals onto which cylindrical bearing rings 34 are placed.
  • the bearing shells 31 of the transverse yoke 30 are supported on the axle journals or bearing rings 34 projecting beyond the bearing cheeks.
  • the latter is provided at its ends with forked legs with aligned bores, bearing bolts 36 being held in the aligned bores and passing through the bearing bores of the piston rods 28, 29.
  • the supporting cylinders 24, 25 are always pressurized with pressurized oil when the tilt cylinder 9 is pressurized with pressurized oil.
  • FIGS. 15 and 16 The type of arrangement of the supporting hydraulic cylinders 40, 41 can best be seen from FIGS. 15 and 16.
  • the web part 44 is provided with bearing forks for the piston rods 45 of the hydraulic cylinders 40, 41.
  • the cylinders 40, 41 of the supporting pressure medium-piston-cylinder units are connected in an articulated manner to the projecting axle journals 46 of the piston rod of the tilt cylinder 9 with the pivot axis 8 pivoting about the deflection lever 7.
  • the handlebars or legs 43 of the U-shaped support part are fundamentally supported in the same pivot positions of the lifting frame and the grave vessel 4 on the cross tube 5 as the support bearings of the piston rods of the supporting hydraulic cylinders 24, 25 with the axle journals 34 of the piston rod of the tilt cylinder 9 with the The pivot lever 8 connecting the pivot axis 8.
  • FIG. 9 shows the device arm 1 in its lowered position with the grave vessel 4 pivoted up in a side view and in FIG. 4 in section.
  • the support cylinders 40, 41 are extended, as is the tilt cylinder 9, and the link 43 or the support structure formed by it is not supported on the cross tube 5.
  • FIGS. 11 and 12 show a representation of the mast corresponding to FIGS. 9 and 10 in a position in which the device arm 1 is pivoted upwards and the digging vessel 4 is also in an upwardly pivoted position, but from which it is still further can be pivoted clockwise.
  • the supporting cylinders 40, 41 are extended to their end positions, so that by further extending the tilt cylinder 1 and further pivoting of the digging vessel 4 in a clockwise direction, the handlebars 43 lift off the cross tube 5.
  • FIGS. 13 and 14 show a representation corresponding to FIGS. 11 and 12, in which the device arm 1 is pivoted up and the grave vessel 4 is pivoted downwards in a counterclockwise direction relative to the position according to FIGS. 11 and 12. In this position, the legs 43 of the supporting part are supported on the cross tube 5 in the manner shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Shovels (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

La structure de levage avec cinématique en Z d'une excavatrice sur roues est constituée d'un bras de machine (1) articulé sur le châssis ou sur l'avant du véhicule, comportant un cylindre de levage (14), et d'un levier de renvoi (7) de type bascule, articulé sur le bras de machine (1), le cylindre de basculement (9) et l'éclisse de raccordement (12) étant articulés sur les extrémités dudit levier de renvoi pour le pivotement de l'outil (4). L'invention vise à faire pivoter l'outil (4) en position levée de la structure de levage, avec le couple suffisant, d'une position inclinée vers le bas vers une position inclinée vers le haut, sans amplification du cylindre de basculement (9). A cet effet, au moins un cylindre hydraulique (24, 25) est articulé sur la structure de levage, en direction de l'outil (4), devant l'articulation (10) reliant le cylindre de basculement (9) au châssis, la tige de piston (28, 29) dudit cylindre hydraulique étant en prise articulée avec l'axe de pivotement (8) reliant le levier de renvoi (7) au cylindre de basculement (9).
EP02753058A 2001-05-22 2002-05-22 Excavatrice sur roues Withdrawn EP1389250A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE20108606U 2001-05-22
DE20108606U DE20108606U1 (de) 2001-05-22 2001-05-22 Radlader
DE20111768U 2001-07-17
DE20111768U DE20111768U1 (de) 2001-07-17 2001-07-17 Radlader
PCT/EP2002/005619 WO2002095142A1 (fr) 2001-05-22 2002-05-22 Excavatrice sur roues

Publications (1)

Publication Number Publication Date
EP1389250A1 true EP1389250A1 (fr) 2004-02-18

Family

ID=26057006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02753058A Withdrawn EP1389250A1 (fr) 2001-05-22 2002-05-22 Excavatrice sur roues

Country Status (6)

Country Link
US (1) US7162817B2 (fr)
EP (1) EP1389250A1 (fr)
CN (1) CN1246539C (fr)
CA (1) CA2446908A1 (fr)
RU (1) RU2268963C2 (fr)
WO (1) WO2002095142A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8839534B2 (en) * 2010-07-28 2014-09-23 Acs Industries, Inc. Monolithic floor for hot slag bucket
CN102296649B (zh) * 2011-07-07 2013-07-17 广西大学 一种多连杆装载机构
US9015968B2 (en) * 2012-07-06 2015-04-28 Caterpillar Inc. Thumb for an excavator machine with structure support
US9303383B2 (en) * 2012-07-06 2016-04-05 Caterpillar Inc. Lift arm cross member
CN105804129A (zh) * 2016-05-17 2016-07-27 广西大学 一种多连杆电动可控装载机
CN105947654A (zh) * 2016-06-24 2016-09-21 山东交通学院 一种平面滑移式多单元连杆驱动电液可控叉木机
CN106149776B (zh) * 2016-07-12 2018-05-15 青岛雷沃工程机械有限公司 一种装载机不同长度动臂通用动臂油缸的设计方法
CN111042235B (zh) * 2019-12-19 2021-04-09 中国地质大学（武汉） 一种可增大铲斗驱动力和行程的正铲挖掘装载装置

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DE1179511B (de) 1959-11-05 1964-10-08 Frank G Hough Co Fahrbarer Frontschaufellader
JPS5233883B2 (fr) * 1972-08-28 1977-08-31
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JPS6014817Y2 (ja) * 1979-04-18 1985-05-11 株式会社小松製作所 掘削積込機の掘削積込装置
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Also Published As

Publication number Publication date
WO2002095142A8 (fr) 2005-03-17
US7162817B2 (en) 2007-01-16
CN1246539C (zh) 2006-03-22
RU2003136740A (ru) 2005-05-27
WO2002095142A1 (fr) 2002-11-28
CN1511211A (zh) 2004-07-07
US20040194355A1 (en) 2004-10-07
RU2268963C2 (ru) 2006-01-27
CA2446908A1 (fr) 2002-11-28

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