EP0818581A1 - Articulation pour pelle hydraulique - Google Patents

Articulation pour pelle hydraulique Download PDF

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Publication number
EP0818581A1
EP0818581A1 EP96907691A EP96907691A EP0818581A1 EP 0818581 A1 EP0818581 A1 EP 0818581A1 EP 96907691 A EP96907691 A EP 96907691A EP 96907691 A EP96907691 A EP 96907691A EP 0818581 A1 EP0818581 A1 EP 0818581A1
Authority
EP
European Patent Office
Prior art keywords
pin
boom
arm
bucket
straight line
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Withdrawn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
EP96907691A
Other languages
German (de)
English (en)
Other versions
EP0818581A4 (fr
Inventor
Kazuo Uehara
Hiromasa Yamaguchi
Naoki Ishizaki
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.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
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 Komatsu Ltd filed Critical Komatsu Ltd
Publication of EP0818581A1 publication Critical patent/EP0818581A1/fr
Publication of EP0818581A4 publication Critical patent/EP0818581A4/fr
Withdrawn legal-status Critical Current

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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
    • E02F3/30—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
    • E02F3/302—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 with an additional link
    • 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
    • E02F3/32—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 downwardly and towards the machine, e.g. with backhoes

Definitions

  • the present invention relates to a link device for a hydraulic excavator, and more particularly, to a link device for a hydraulic excavator which has a simple structure and is capable of horizontal digging.
  • a boom 2 is mounted vertically swingable by means of a boom hoot pin 1.
  • One end of a boom cylinder 5 is connected to the upper machinery 31 by means of a boom bottom pin 3, and the other end is connected to the boom 2 by means of a boom head pin 18 so that the boom cylinder 5 extends and contracts to swing vertically the boom 2.
  • An arm 7 is rockably mounted to the tip of the boom 2 by means of an arm foot pin 6.
  • One end of an arm cylinder 10 is connected to the boom 2 by means of an arm bottom pin 8, and the other end is connected to a rear end of the arm 7 by means of an arm head pin 9 so that the arm cylinder 10 extends and contracts to rock the arm 7.
  • a bucket 12 is rockably mounted to the tip of the arm 7 by means of a bucket foot pin 11.
  • One end of a bucket cylinder 17 is connected to the arm 7 by means of a bucket bottom pin 16, and the other end is connected to the bucket 12 through a bucket head pin 13, a bucket link 14, and a bucket link pin 15.
  • the bucket cylinder 17 extends and contracts to rock the bucket 12.
  • the boom cylinder 5 is extended and contracted to swing vertically the boom 2, and a tooth 23 of the tip of the bucket 12 is brought into abutment with a digging place.
  • the arm cylinder 10 is extended to draw the tip of the arm 7 so as to perform digging.
  • the bucket cylinder 17 is extended to pull up the bucket 12 toward the proximal side so as to dig up earth and sand.
  • a leveling hydraulic cylinder 53 is provided between the boom 2 and the arm 7 (refer to, for example, Japanese Examined Utility Model Publication No. 59-35659).
  • An extrusion-side oil chamber and a retract-side oil chamber of a piston rod 53a of the leveling hydraulic cylinder 53 are in communication with an extrusion-side oil chamber and a retract-side oil chamber of a piston rod 5a of the boom cylinder 5 by means of pipes 56 and 57, respectively.
  • the present invention has been made to solve the drawbacks of the prior art, and its object is to provide economically a link device for a hydraulic excavator which has a simple structure and is capable of horizontal digging.
  • a link device for a hydraulic excavator having a boom mounted vertically swingable to a chassis by means of a boom foot pin and rocked by a boom cylinder one end of which is mounted to the chassis through a boom cylinder bottom pin, an arm rockably mounted to the tip of the boom by means of an arm foot pin and rocked by an arm cylinder, and a bucket rockably mounted to the tip of the arm by means of a bucket foot pin and rocked by a bucket cylinder, the device comprising:
  • the boom pin, the boom head pin, and the boom bottom pin may preferably be located on a straight line in a state where the tip of a tooth of the bucket is located on an intersection of a vertical line passing through the arm foot pin and the ground surface.
  • a straight line connecting the boom pin and the arm pin may preferably be substantially parallel to a straight line connecting the arm foot pin and the am power pin.
  • a straight line connecting the boom pin and the arm foot pin may preferably be substantially parallel to a straight line connecting the arm pin and the arm power pin.
  • the ratio r1/r2 may preferably be substantially equal to the ratio L1/L2 when a vertical distance between a straight line connecting the boom pin and the boom bottom pin and the boom foot pin is taken as r1, a distance between the boom pin and the boom head pin is taken as r2, a vertical distance between the boom foot pin and a vertical line passing through the arm foot pin is taken as L1, and a distance between the intersection and the arm foot pin is taken as L2 in a state where the tip of the tooth of the bucket is located on the intersection of the vertical line passing through the arm foot pin and the ground surface.
  • a range in which r2 is smaller than (r1 x L2/L1) is more preferable within the range in which the ratio r1/r2 is substantially equal to the ratio L1/L2.
  • the boom pin, the boom head pin, and the boom bottom pin may be located on a straight line in a state where the tip of the tooth of the bucket is located on the intersection of the vertical line passing through the arm foot pin and the ground surface, and, when the arm is operated toward the front of the chassis from the state of being located on the straight line while extension and contraction of the bucket cylinder being held fixed, a distance r2 between the boom pin and the boom head pin may preferably be set so that the tip of the tooth moves substantially on a straight line. Further, when linear digging is not performed, the power rod may be removed, and the power lever may be locked so as not to rock around the boom pin.
  • the tooth of the bucket when the tooth of the bucket is brought into the digging place to rock the arm in the digging direction with the boom cylinder locked, the arm rotates counterclockwise around the arm foot pin, so that the power lever rotates counterclockwise around the boom pin through the power rod.
  • the boom cylinder since the boom cylinder does not extend and contract, the boom will be raised and the tooth of the bucket ascends by that amount, so that the tooth of the bucket moves linearly. More exactly, the tooth of the bucket moves substantially on a straight line with a tendency to slightly rise at an intermediate section.
  • the power lever rotates counterclockwise around the boom pin through the power rod. Since the boom cylinder does not extend and contract at this time, the boom will be lowered and the tooth of the bucket descends by the amount, so that the tooth of the bucket moves linearly. Further, if the straight line connecting the boom pin and the arm pin is substantially parallel to the straight line connecting the arm foot pin and the arm power pin, or if the straight line connecting the boom pin and arm foot pin is substantially parallel to the straight line connecting the arm pin and the arm power pin, the tooth of the bucket can move more linearly.
  • the tooth moves substantially linearly.
  • the distance r2 is slightly shorter than r1 x L2/L1, the error can be minimized.
  • the distance r2 so that the tip of the tooth of the bucket moves substantially on a straight line with the extension and contraction of the bucket cylinder fixed, a linear leveling operation can be performed even in a extruding operation of the am.
  • the power rod is removed and the power lever is fixed to the boom, whereby the device can be used as a normal hydraulic excavator.
  • a boom 2 is mounted vertically swingable by means of a boom hoot pin 1.
  • a first fulcrum of a triangular power lever 19 having three fulcrums is rockably mounted near the center of a boom 2 by means of a boom pin 4.
  • One end of a boom cylinder 5 is connected to the upper machinery 31 by means of a boom bottom pin 3, and the other end is connected to a second fulcrum of the power lever 19 by means of a boom head pin 18.
  • An arm 7 is rockably mounted to the tip of the boom 2 by means of an am foot pin 6.
  • the rear end of the arm 7 is connected to an arm cylinder 10 by means of an arm head pin 9 so that the arm 7 is rocked by extension and contraction of the arm cylinder 10.
  • a bucket 12 is rockably mounted to the tip of the arm 7 by means of a bucket foot pin 11.
  • One end of a bucket cylinder 17 is connected to the arm 7 by means of a bucket bottom pin 16, and the other end is connected to the bucket 12 through a bucket head pin 13, a bucket link 14, and a bucket link pin 15.
  • the bucket 12 is rocked by the extension and contraction of the bucket cylinder 17.
  • a straight line connecting the boom pin 4 and the arm pin 20 is substantially parallel to a straight line connecting the arm foot pin 6 and the arm power pin 21, and a straight line connecting the boom pin 4 and the arm foot pin 6 is substantially parallel to a straight line connecting the arm pin 20 and the arm power pin 21. That is, the boom pin 4, the arm foot pin 6, the arm power pin 21, and the arm pin 20 form substantially a parallelogram.
  • the arm cylinder 10 When digging the ground horizontally, as shown in Fig. 1, the arm cylinder 10 is contracted to project the arm 7 toward the front, and the tip of the tooth 23 of the bucket 12 is brought into abutment with the ground surface A-B. Next, the arm cylinder 10 is extended to draw the arm 7 to the proximal side. The arm 7, as shown in Fig. 2, rocks the power lever 19 through the power rod 22 while being in a vertical position so as to raise the boom 2. When the tooth 23 passes point C, the boom 2 is lowered again. At this time, since the dimensional proportion of each part is in the relation as described above, the tip of the tooth 23 slightly tends to move convexly, but moves substantially in horizontal along the ground surface A-B. That is, an operator can easily perform horizontal digging by only operating the arm cylinder 10.
  • Fig. 3 illustrates a construction of a second embodiment of the link device.
  • An intermediate fulcrum of a power lever 19a having three fulcrums is rockably mounted to a boom 2 by means of a boom pin 4a.
  • a lower fulcrum of the power lever 19a is connected to a head section of a boom cylinder 5 by means of a boom head pin 18a.
  • the upper fulcrum of the power lever 19a is connected to one end of a power rod 22a by means of an arm pin 20a.
  • the other end of the power rod 22a is connected to the rear end of an arm 7 by means of an arm power pin 21a.
  • the other portions are the same as those of the first embodiment.
  • a straight line connecting the arm pin 20a and the boom pin 4a is substantially parallel to a straight line connecting the am power pin 21a and the arm foot pin 6, and a straight line connecting the arm power pin 21a and the arm pin 20a is substantially parallel to a straight line connecting the arm foot pin 6 and the boom pin 4a. That is, the arm pin 20a, the arm power pin 21a, the arm foot pin 6, and the boom pin 4a form substantially a parallelogram. The operation is the same as that of the first embodiment.
  • the present invention is useful as a link device for a hydraulic excavator which can perform a horizontal digging and a linear digging of a normal plane with high accuracy by a simple work of operating an arm only, offer reduction in fatigue of an operator and an improvement in operability, and increase arm digging force.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
EP96907691A 1995-03-30 1996-03-28 Articulation pour pelle hydraulique Withdrawn EP0818581A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP10074895A JP3369025B2 (ja) 1995-03-30 1995-03-30 油圧ショベル用リンク装置
JP100748/95 1995-03-30
PCT/JP1996/000826 WO1996030597A1 (fr) 1995-03-30 1996-03-28 Articulation pour pelle hydraulique

Publications (2)

Publication Number Publication Date
EP0818581A1 true EP0818581A1 (fr) 1998-01-14
EP0818581A4 EP0818581A4 (fr) 1998-07-01

Family

ID=14282161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96907691A Withdrawn EP0818581A4 (fr) 1995-03-30 1996-03-28 Articulation pour pelle hydraulique

Country Status (4)

Country Link
EP (1) EP0818581A4 (fr)
JP (1) JP3369025B2 (fr)
KR (1) KR19990007776A (fr)
WO (1) WO1996030597A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123948A2 (fr) 2005-05-16 2006-11-23 Rocktec Limited Montage ameliore de mouton de battage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105421503B (zh) * 2015-11-10 2018-07-31 东莞市京工自动化设备有限公司 一种可控机构式搬运机器手
CN112696198B (zh) * 2020-12-18 2023-11-10 江西鑫通机械制造有限公司 一种长距离煤矿挖掘机臂

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2067573A5 (fr) * 1969-11-07 1971-08-20 Agren Rolf
GB2031843A (en) * 1978-09-20 1980-04-30 Ruston Bucyrus Ltd Face loading shovel excavator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158263U (fr) * 1984-09-25 1986-04-19
JPS61169165U (fr) * 1985-04-03 1986-10-20

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2067573A5 (fr) * 1969-11-07 1971-08-20 Agren Rolf
GB2031843A (en) * 1978-09-20 1980-04-30 Ruston Bucyrus Ltd Face loading shovel excavator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9630597A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123948A2 (fr) 2005-05-16 2006-11-23 Rocktec Limited Montage ameliore de mouton de battage

Also Published As

Publication number Publication date
JP3369025B2 (ja) 2003-01-20
EP0818581A4 (fr) 1998-07-01
JPH08269995A (ja) 1996-10-15
KR19990007776A (ko) 1999-01-25
WO1996030597A1 (fr) 1996-10-03

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