EP2039837B1 - Excavator bottom frame. - Google Patents

Excavator bottom frame. Download PDF

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Publication number
EP2039837B1
EP2039837B1 EP07425583A EP07425583A EP2039837B1 EP 2039837 B1 EP2039837 B1 EP 2039837B1 EP 07425583 A EP07425583 A EP 07425583A EP 07425583 A EP07425583 A EP 07425583A EP 2039837 B1 EP2039837 B1 EP 2039837B1
Authority
EP
European Patent Office
Prior art keywords
frame
outlet
excavator
cavity
cavities
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.)
Active
Application number
EP07425583A
Other languages
German (de)
French (fr)
Other versions
EP2039837A1 (en
Inventor
Gabriele Villa
Massimo Pinto
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.)
New Holland Kobelco Construction Machinery SpA
Original Assignee
New Holland Kobelco Construction Machinery SpA
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.)
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Publication date
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Application filed by New Holland Kobelco Construction Machinery SpA filed Critical New Holland Kobelco Construction Machinery SpA
Priority to DE602007010780T priority Critical patent/DE602007010780D1/en
Priority to EP07425583A priority patent/EP2039837B1/en
Priority to AT07425583T priority patent/ATE489508T1/en
Publication of EP2039837A1 publication Critical patent/EP2039837A1/en
Application granted granted Critical
Publication of EP2039837B1 publication Critical patent/EP2039837B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/02—Travelling-gear, e.g. associated with slewing gears
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/18—Counterweights

Definitions

  • the present invention relates to an excavator bottom frame.
  • an excavator comprises three main parts : a bottom frame, or undercarriage, which moves over the ground on wheels or tracks; a top frame having an operator cab and connected to the bottom frame by a pivot to rotate about a vertical axis; and a front digging or lifting device, e.g. an arm and bucket, fitted to the top frame and operated from the operator cab.
  • a bottom frame or undercarriage, which moves over the ground on wheels or tracks
  • a top frame having an operator cab and connected to the bottom frame by a pivot to rotate about a vertical axis
  • a front digging or lifting device e.g. an arm and bucket
  • the top frame is normally designed to support a counterweight in such a position as to ensure stability of the excavator when digging and/or lifting, and which is normally bolted removably to the top frame.
  • excavators have increasingly heavy counterweights which, for support, call for stronger counterweight-top frame attachments, a stronger or bigger pivot, reinforcing the structure of the top frame, etc.., all of which are relatively expensive and increase the end cost of the excavator.
  • a mass is needed that can be added to a main counterweight to enhance stability of the excavator, and can be removed when not required.
  • One solution to the above drawbacks is to provide a counterweight on the bottom frame in addition to or instead of the counterweight on the top frame.
  • Patent Application DE10014933 describes a removable counterweight housed in a recess on the outside of a platform on the bottom frame, and which can be lifted out of the recess when the excavator travels along highway and the load on the axle of the excavator exceeds the maximum allowable.
  • US 2003/150138 discloses an excavator with an under carriage having a hollow frame. Inside this hollow frame there is a fuel tank formed as one with said hollow frame and compartmentalized.
  • a bottom frame according to claim 1 is provided.
  • Said cavity is preferably filled at least partly with granular aggregate or a liquid.
  • Number 1 in Figure 1 indicates an excavator (shown schematically) comprising an undercarriage or bottom frame 2 which runs over the ground on tracks 3; a top frame 4 having an operator cab 5 and connected to bottom frame 2 by a pivot 6 to rotate about a vertical axis 7; and an arm 8 which is fitted on the end with a digging or lifting member, is fitted to frame 4, and is operated from operator cab 5.
  • an excavator shown schematically
  • an excavator shown schematically
  • an undercarriage or bottom frame 2 which runs over the ground on tracks 3
  • a top frame 4 having an operator cab 5 and connected to bottom frame 2 by a pivot 6 to rotate about a vertical axis 7
  • an arm 8 which is fitted on the end with a digging or lifting member, is fitted to frame 4, and is operated from operator cab 5.
  • frame 2 comprises structural members defined by two lateral longitudinal members 10 and by intermediate members 11.
  • Longitudinal members 10 are parallel to a horizontal longitudinal axis 12 coincident with the travelling direction of excavator 1, and are fitted on the ends with known fastening devices 13, not described in detail, for connection of tracks 3.
  • Members 11 connect longitudinal members 10 to each other, are located about pivot 6, and are enclosed by a substantially horizontal top plate 15 and bottom plate 16.
  • Members 11 and plates 15, 16 define a number of cavities 20, which can be filled with granular aggregate, in particular, sand, which serves as a removable inner counterweight for excavator 1, in addition to an existing counterweight (not shown) on frame 4.
  • Cavities 20 are four in number, are symmetrical with respect to axis 12, and define symmetrical volumes. More specifically, cavities 20 are arranged in diametrically opposite pairs with respect to axis 7.
  • Cavities 20 have respective inlets 21 formed in plate 15 to insert the granular material; and respective outlets 22 formed in plate 16, and in particular in two lateral portions 23 adjacent to longitudinal members 10.
  • Inlet 21 and outlet 22 of each cavity 20 are offset vertically, and are closed by plugs defined by respective flanged disks or bodies 25, 26 fixed to respective plates 15, 16 by bolts or screws (not shown) screwed about the circular edges of inlet 21 and outlet 22.
  • frame 2 is loaded directly with granular aggregate fed into cavities 20 through inlets 21, with outlets 22 closed. Once the cavities are filled, inlets 21 are also closed.
  • outlets 22 are opened to unload the granular material from cavities 20.
  • the solution proposed therefore provides for applying additional weight without altering and/or reinforcing pivot 6 and/or frame 4, by virtue of the additional weight being applied to frame 2, as opposed to frame 4.
  • the proposed solution is also extremely cheap by requiring no additional and/or specially designed component parts, such as supporting platforms, by which to fit the additional counterweight to frame 2, and by actually employing fillable volumes already available inside the bottom frames of excavators.
  • frame 2 may have attachments for wheel axles, as opposed to tracks.
  • Cavities 20 may also be filled with liquid (as opposed to sand), e.g. with a mixture of water and additives to prevent rusting of frame 2. In which case, sealing must be ensured, e.g. by means of seals, between outlets 22 and the plugs defined by disks 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Earth Drilling (AREA)

Abstract

A bottom frame (2) of an excavator has structural members (10, 11), at least some of which define a cavity (20) having an inlet (21) for granular aggregate defining an inner counterweight, and an outlet (22) that can be opened to unload the material.

Description

  • The present invention relates to an excavator bottom frame.
  • As is known, an excavator comprises three main parts : a bottom frame, or undercarriage, which moves over the ground on wheels or tracks; a top frame having an operator cab and connected to the bottom frame by a pivot to rotate about a vertical axis; and a front digging or lifting device, e.g. an arm and bucket, fitted to the top frame and operated from the operator cab.
  • The top frame is normally designed to support a counterweight in such a position as to ensure stability of the excavator when digging and/or lifting, and which is normally bolted removably to the top frame.
  • To ensure stability, currently marketed excavators have increasingly heavy counterweights which, for support, call for stronger counterweight-top frame attachments, a stronger or bigger pivot, reinforcing the structure of the top frame, etc.., all of which are relatively expensive and increase the end cost of the excavator.
  • Moreover, for flexible operation of the excavator, a mass is needed that can be added to a main counterweight to enhance stability of the excavator, and can be removed when not required.
  • One solution to the above drawbacks is to provide a counterweight on the bottom frame in addition to or instead of the counterweight on the top frame.
  • In this connection, Patent Application DE10014933 describes a removable counterweight housed in a recess on the outside of a platform on the bottom frame, and which can be lifted out of the recess when the excavator travels along highway and the load on the axle of the excavator exceeds the maximum allowable.
  • The above known solution is relatively complicated, by requiring a specially designed platform with an external recess in which to house the counterweight.
  • US 2003/150138 discloses an excavator with an under carriage having a hollow frame. Inside this hollow frame there is a fuel tank formed as one with said hollow frame and compartmentalized.
  • It is an object of the present invention to provide an excavator bottom frame designed to provide a straightforward, low-cost solution to the above problems.
  • According to the present invention, a bottom frame according to claim 1 is provided.
  • Said cavity is preferably filled at least partly with granular aggregate or a liquid.
  • A non-limiting embodiment of the invention will be described by way of example with reference to the accompanying drawings, in which:
    • Figure 1 shows a schematic side view of an excavator featuring a preferred embodiment of the bottom frame according to the present invention;
    • Figures 2 and 3 show, respectively, larger-scale, topside and underside views in perspective of the Figure 1 bottom frame.
  • Number 1 in Figure 1 indicates an excavator (shown schematically) comprising an undercarriage or bottom frame 2 which runs over the ground on tracks 3; a top frame 4 having an operator cab 5 and connected to bottom frame 2 by a pivot 6 to rotate about a vertical axis 7; and an arm 8 which is fitted on the end with a digging or lifting member, is fitted to frame 4, and is operated from operator cab 5.
  • With reference to Figures 2 and 3, frame 2 comprises structural members defined by two lateral longitudinal members 10 and by intermediate members 11. Longitudinal members 10 are parallel to a horizontal longitudinal axis 12 coincident with the travelling direction of excavator 1, and are fitted on the ends with known fastening devices 13, not described in detail, for connection of tracks 3. Members 11 connect longitudinal members 10 to each other, are located about pivot 6, and are enclosed by a substantially horizontal top plate 15 and bottom plate 16.
  • Members 11 and plates 15, 16 define a number of cavities 20, which can be filled with granular aggregate, in particular, sand, which serves as a removable inner counterweight for excavator 1, in addition to an existing counterweight (not shown) on frame 4.
  • Cavities 20 are four in number, are symmetrical with respect to axis 12, and define symmetrical volumes. More specifically, cavities 20 are arranged in diametrically opposite pairs with respect to axis 7.
  • Cavities 20 have respective inlets 21 formed in plate 15 to insert the granular material; and respective outlets 22 formed in plate 16, and in particular in two lateral portions 23 adjacent to longitudinal members 10.
  • Inlet 21 and outlet 22 of each cavity 20 are offset vertically, and are closed by plugs defined by respective flanged disks or bodies 25, 26 fixed to respective plates 15, 16 by bolts or screws (not shown) screwed about the circular edges of inlet 21 and outlet 22.
  • To increase the stability of excavator 1, particularly when digging/lifting using arm 8, frame 2 is loaded directly with granular aggregate fed into cavities 20 through inlets 21, with outlets 22 closed. Once the cavities are filled, inlets 21 are also closed.
  • Conversely, to reduce the weight of frame 2, e.g. when travelling along highway, outlets 22 are opened to unload the granular material from cavities 20.
  • The solution proposed therefore provides for applying additional weight without altering and/or reinforcing pivot 6 and/or frame 4, by virtue of the additional weight being applied to frame 2, as opposed to frame 4.
  • Filling the inside of frame 2 greatly increases the weight and lowers the centre of gravity, to effectively enhance the stability, of excavator 1. More specifically, lowering the centre of gravity allows steeper uphill and downhill travel, as compared with known solutions with only one counterweight on frame 4.
  • Moreover, using sand is cheaper than the materials normally used for known counterweights.
  • The proposed solution is also extremely cheap by requiring no additional and/or specially designed component parts, such as supporting platforms, by which to fit the additional counterweight to frame 2, and by actually employing fillable volumes already available inside the bottom frames of excavators.
  • More specifically, frame 2 may have attachments for wheel axles, as opposed to tracks.
  • Cavities 20 may also be filled with liquid (as opposed to sand), e.g. with a mixture of water and additives to prevent rusting of frame 2. In which case, sealing must be ensured, e.g. by means of seals, between outlets 22 and the plugs defined by disks 26.

Claims (7)

  1. A bottom frame (2) of an excavator, comprising:
    - a number of structural members (10, 11), at least some of which define a cavity (20); said cavity having an inlet (21) and
    - fastening means (13) for wheels or tracks;
    said cavity (20) being suitable for receiving a counterweight material, said material being entered in said cavity (20) through said inlet (21), characterised in that said cavity (20) further comprises an outlet (22) and is unloaded through said outlet (22); and said outlet (22) comprises movable closing means (26) for opening/closing said outlet (22).
  2. A frame as claimed in Claim 1, characterized in that said cavity (20) is filled at least partly with granular aggregate or a liquid.
  3. A frame as claimed in Claim 1 or 2, characterized in that both said inlet (21) and said outlet (22) are closed by removable plugs (25, 26).
  4. A frame as claimed in any of the preceding claims, characterized in that said inlet (21) and said outlet (22) are formed in respective substantially horizontal walls (15, 16).
  5. A frame as claimed in Claim 4, characterized in that said inlet (21) and said outlet (22) are offset vertically.
  6. A frame as claimed in any one of the foregoing Claims, characterized by comprising a number of said cavities (20); said cavities being located symmetrically and defining symmetrical volumes with respect to a horizontal longitudinal axis (12) coincident with a travelling direction of said excavator (1).
  7. A frame as claimed in any one of the foregoing Claims, characterized by comprising a number of said cavities (20); and a pivot (6) for support and rotation of a top frame (4) of said excavator (1); said cavities (20) being diametrically opposite each other about said pivot (6).
EP07425583A 2007-09-21 2007-09-21 Excavator bottom frame. Active EP2039837B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE602007010780T DE602007010780D1 (en) 2007-09-21 2007-09-21 Support frame of an excavator
EP07425583A EP2039837B1 (en) 2007-09-21 2007-09-21 Excavator bottom frame.
AT07425583T ATE489508T1 (en) 2007-09-21 2007-09-21 SUPPORTING FRAME OF AN EXCAVATOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425583A EP2039837B1 (en) 2007-09-21 2007-09-21 Excavator bottom frame.

Publications (2)

Publication Number Publication Date
EP2039837A1 EP2039837A1 (en) 2009-03-25
EP2039837B1 true EP2039837B1 (en) 2010-11-24

Family

ID=38961777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07425583A Active EP2039837B1 (en) 2007-09-21 2007-09-21 Excavator bottom frame.

Country Status (3)

Country Link
EP (1) EP2039837B1 (en)
AT (1) ATE489508T1 (en)
DE (1) DE602007010780D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT508733B1 (en) * 2009-08-31 2011-09-15 Sandvik Mining & Constr Oy PARTIAL CIRCUIT BZW. BORING MACHINE

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231699A (en) * 1979-01-24 1980-11-04 Dresser Industries, Inc. Lower and crawler frame construction for crawler propelled machines
US5154013A (en) * 1991-08-19 1992-10-13 Harnischfeger Corporation Lifting stool for a support tub of a dragline excavating machine
JPH11200420A (en) * 1998-01-19 1999-07-27 Sumitomo Constr Mach Co Ltd Counterweight of construction machine
DE10014933A1 (en) 2000-03-20 2001-10-04 Mannesmann Ag Self-propelled crane has a counterweight with a body fitted with a central opening recess to take the weight(s) for balanced working and their removal when traveling on roads
JP3829071B2 (en) 2001-05-31 2006-10-04 新キャタピラー三菱株式会社 Construction machinery
WO2004033273A1 (en) * 2002-10-09 2004-04-22 Hitachi Construction Machinery Co., Ltd. Track frame for construction machine
JP2005220569A (en) * 2004-02-04 2005-08-18 Kobelco Contstruction Machinery Ltd Counterweight and producing method thereof
JP2005264431A (en) * 2004-03-16 2005-09-29 Kobelco Contstruction Machinery Ltd Method of manufacturing counterweight for working machine, counterweight, and working machine

Also Published As

Publication number Publication date
EP2039837A1 (en) 2009-03-25
ATE489508T1 (en) 2010-12-15
DE602007010780D1 (en) 2011-01-05

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