EP2077356B1 - Articulated arm for machines - Google Patents
Articulated arm for machines Download PDFInfo
- Publication number
- EP2077356B1 EP2077356B1 EP20070425848 EP07425848A EP2077356B1 EP 2077356 B1 EP2077356 B1 EP 2077356B1 EP 20070425848 EP20070425848 EP 20070425848 EP 07425848 A EP07425848 A EP 07425848A EP 2077356 B1 EP2077356 B1 EP 2077356B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hinge
- arm
- connecting valve
- axis
- elongated
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 2
- 230000006735 deficit Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- 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
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2275—Hoses and supports therefor and protection therefor
Definitions
- the present invention relates to an articulated arm for machines in general, and for excavators in particular.
- excavators comprise an articulated arm, an elongated end portion of which is hinged at one end to an intermediate connecting portion of the articulated arm, and is fitted at the other end with a bucket.
- the bucket of most excavators is replaceable with accessory implements, such as wrecking devices, grippers, etc., which, however, require an additional hydraulic connecting point for connection to the hydraulic control system of the excavator.
- the arm has an additional hydraulic circuit comprising a feed pipe, and a hydraulic connecting valve for connecting the accessory implements.
- the hydraulic connecting valve is connected integrally to the elongated end portion by a supporting bracket connected firmly to the connecting valve and to the end portion by means of screws.
- the pipe is connected at one end to the user-operated hydraulic distributor, and at the other end to the hydraulic connecting valve, and comprises, at the hinge point between the end and intermediate portions of the arm, a length of hose made of elastomeric material, terminating at the hydraulic connecting valve, and designed to form a number of elastically deformable loops.
- hoses used normally project beyond the bottom edge of the articulated arm, with the result that, when the arm is operating in the lowered position, the hose often knocks against, drags along, or is caught up by the material being removed, thus resulting in rapid wear of the hose and, at times, even severing of the hose when the arm is raised.
- JP-A-2002013160 discloses a hydraulic piping structure where the pipes from the machine body to the switching valve on the implement are connected via a rotatable pipe block positioned on top of the machine body.
- JP-A-2002250047 discloses a pipe support structure for backhoes with an offset mechanism comprising a plurality of pipes on the upper face of the upper boom. Guide plates maintain the pipes in a parallelogram, when changing the direction of the boom.
- an articulated arm for machines comprising at least one elongated portion hinged to rotate about a hinge axis with respect to an adjacent connecting portion; and an additional hydraulic circuit for feeding hydraulic fluid to accessory implements connectable to the articulated arm; said additional hydraulic circuit comprising hydraulic connecting valve means for hydraulically connecting said accessory implements, and connecting means for connecting said connecting valve means to said elongated portion; characterized in that said connecting means comprise hinge means to permit rotation of said connecting valve means about a rotation axis parallel to said hinge axis.
- the hinge means of the articulated arm defined above preferably comprise a bracket connected integrally to said connecting valve means; and a hinge pin extending through said bracket coaxially with said rotation axis and connected integrally to said elongated portion.
- Said additional hydraulic circuit preferably also comprises a flexible pipe portion extending at least partly at said hinge axis; said flexible pipe portion being located inside a space defined at the bottom by a surface parallel to said hinge axis and through a bottom peripheral edge of said arm, regardless of the operating position of said elongated portion.
- Number 1 in Figure 1 indicates as a whole a machine, in particular a self-propelled earthmoving machine.
- Machine 1 comprises a known articulated arm 2, in turn comprising an elongated intermediate connecting portion 3, and an elongated end portion 4.
- Elongated end portion 4 is hinged to elongated intermediate portion 3 by a hinge pin 5 to rotate, with respect to intermediate portion 3, about a substantially horizontal hinge axis 6 perpendicular to elongated portions 3 and 4.
- a bucket 7 is hinged to a free end of elongated end portion 4 and is operated by a respective hydraulic jack 8 connected to a main hydraulic circuit of the machine, and may be replaced with accessory implements, such as wrecking devices, grippers, etc., shown schematically and indicated as a whole by 12, to perform different operations with the same machine.
- accessory implements such as wrecking devices, grippers, etc., shown schematically and indicated as a whole by 12, to perform different operations with the same machine.
- accessory implements 12 are operated by respective hydraulic actuators (not shown) connected hydraulically to an additional hydraulic circuit indicated as a whole by 15.
- Additional hydraulic circuit 15 is fitted at least partly to elongated portions 3 and 4, and comprises a connecting valve 16 fitted to elongated end portion 4; and a hydraulic-fluid feed pipe 18 connected at one end in known manner to a known user-operated hydraulic distributor (not shown), and at the other end to an inlet of connecting valve 16.
- Feed pipe 18 comprises a rigid portion 19 extending along, and connected firmly in known manner to, intermediate portion 3; and a flexible end portion 20, defined by a hose, which extends at hinge axis 6, and is connected in fluidtight manner at one end to rigid portion 19, and at the other end directly to the inlet of connecting valve 16.
- connecting valve 16 comprises an outer casing 22 connected firmly, e.g. by means of screws 23, to one leg 24 of an L-shaped supporting bracket 25, the other leg 26 of which extends parallel to and facing a lateral wall 27 of elongated end portion 4, and is connected to lateral wall 27 by a hinge assembly 30 to enable rotation of bracket 25, and therefore of connecting valve 16, about a fixed hinge axis 31 parallel to axis 6.
- hinge assembly 30 comprises a nut screw 33 fitted firmly, e.g. welded, to and projecting from lateral wall 27 coaxially with axis 31; and a screw 34.
- Screw 34 comprises a threaded shank 35, an end portion of which is screwed inside nut screw 33, and a portion of which, extending from head 36 of the screw, extends through a collar or ring 37 forced by head 36 of the screw against nut screw 33.
- Collar 37 engages in rotary manner a through hole formed in leg 26, and is of a length, measured parallel to axis 31, approximately equal to but no less than the thickness of leg 26, so that bracket 25 rotates freely with respect to screw 34 and collar 37.
- hinge assembly 30 allows connecting valve 16 to rotate about axis 31 with respect to end portion 4 of the arm, as end portion 4 rotates with respect to intermediate portion 3. Allowing valve 16 to rotate reduces the forces exerted on both hose 20 and the joints connecting hose 20 to rigid portion 19 and connecting valve 16, thus prolonging the working life of both hose 20 and the joints, and so reducing hydraulic fluid leakage and losses.
- hose 20 by allowing connecting valve 16 to move with respect to elongated portion 4 of the arm to which it is connected, the length of hose 20 can be reduced considerably as compared with known solutions, so that hose 20 remains completely facing the arm, regardless of the relative position of elongated portions 3 and 4.
- hose 20 regardless of the angular position of end portion 4 with respect to intermediate portion 3, hose 20 remains at all times inside a space defined at the bottom by a surface parallel to axes 6 and 31 and through a bottom edge 40 of arm 2. That is, hose 20, by never coming into contact with the material or ground below the arm, operates in the best working conditions at all times, with no impairment in its original characteristics and, hence, original efficiency and reliability.
- connecting valve 16 may be supported by brackets or fastening members other than the bracket described; and hinge assembly 30 may be formed differently from the one shown by way of example, while still allowing at least one rotation of connecting valve 16 with respect to the elongated portion to which it is connected.
- arm 2 as described herein may obviously form part of any machine other than the earthmoving machine described by way of example.
- the same problems referred to specifically in connection with earthmoving machines are obviously also encountered in other types of machines featuring articulated lifting, resisting, or supporting arms.
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- 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)
- Shovels (AREA)
Description
- The present invention relates to an articulated arm for machines in general, and for excavators in particular.
- As is known, excavators comprise an articulated arm, an elongated end portion of which is hinged at one end to an intermediate connecting portion of the articulated arm, and is fitted at the other end with a bucket. To enhance the versatility of the machine, the bucket of most excavators is replaceable with accessory implements, such as wrecking devices, grippers, etc., which, however, require an additional hydraulic connecting point for connection to the hydraulic control system of the excavator. For this purpose, the arm has an additional hydraulic circuit comprising a feed pipe, and a hydraulic connecting valve for connecting the accessory implements. The hydraulic connecting valve is connected integrally to the elongated end portion by a supporting bracket connected firmly to the connecting valve and to the end portion by means of screws.
- The pipe is connected at one end to the user-operated hydraulic distributor, and at the other end to the hydraulic connecting valve, and comprises, at the hinge point between the end and intermediate portions of the arm, a length of hose made of elastomeric material, terminating at the hydraulic connecting valve, and designed to form a number of elastically deformable loops.
- Though widely adopted, additional hydraulic circuits of the type described above are unsatisfactory, both in terms of efficiency and reliability, and the potentially high maintenance cost involved.
- This is mainly due to the way in which the hydraulic connecting valve is connected to the arm requiring the use of relatively long hoses to enable the end portion to rotate with respect to the intermediate supporting portion, and to prevent overly stressing the pipe.
- The hoses used, however, normally project beyond the bottom edge of the articulated arm, with the result that, when the arm is operating in the lowered position, the hose often knocks against, drags along, or is caught up by the material being removed, thus resulting in rapid wear of the hose and, at times, even severing of the hose when the arm is raised.
- The forces transmitted to the hoses often inevitably result, even after a relatively short time, in hydraulic fluid leakage at the joints between the hose and connecting valve, and between the hose and the rest of the pipe upstream from the hose, with the result that the hydraulic fluid level must be monitored constantly and topped up regularly.
-
JP-A-2002013160 -
JP-A-2002250047 - It is an object of the present invention to provide an articulated arm for machines, designed to provide a straightforward, low-cost solution to the above problems.
- According to the present invention, there is provided an articulated arm for machines, comprising at least one elongated portion hinged to rotate about a hinge axis with respect to an adjacent connecting portion; and an additional hydraulic circuit for feeding hydraulic fluid to accessory implements connectable to the articulated arm; said additional hydraulic circuit comprising hydraulic connecting valve means for hydraulically connecting said accessory implements, and connecting means for connecting said connecting valve means to said elongated portion; characterized in that said connecting means comprise hinge means to permit rotation of said connecting valve means about a rotation axis parallel to said hinge axis.
- The hinge means of the articulated arm defined above preferably comprise a bracket connected integrally to said connecting valve means; and a hinge pin extending through said bracket coaxially with said rotation axis and connected integrally to said elongated portion.
- Said additional hydraulic circuit preferably also comprises a flexible pipe portion extending at least partly at said hinge axis; said flexible pipe portion being located inside a space defined at the bottom by a surface parallel to said hinge axis and through a bottom peripheral edge of said arm, regardless of the operating position of said elongated portion.
- A non-limiting embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
-
Figure 1 shows a partial side view in perspective of a preferred embodiment of a machine articulated arm in accordance with the teachings of the present invention; -
Figure 2 shows the same view as inFigure 1 , of theFigure 1 arm in a different operating position; -
Figure 3 shows a larger-scale section along line III-III. -
Number 1 inFigure 1 indicates as a whole a machine, in particular a self-propelled earthmoving machine.Machine 1 comprises a known articulatedarm 2, in turn comprising an elongated intermediate connectingportion 3, and an elongated end portion 4. Elongated end portion 4 is hinged to elongatedintermediate portion 3 by ahinge pin 5 to rotate, with respect tointermediate portion 3, about a substantiallyhorizontal hinge axis 6 perpendicular toelongated portions 3 and 4. Abucket 7 is hinged to a free end of elongated end portion 4 and is operated by a respectivehydraulic jack 8 connected to a main hydraulic circuit of the machine, and may be replaced with accessory implements, such as wrecking devices, grippers, etc., shown schematically and indicated as a whole by 12, to perform different operations with the same machine. - With reference to the accompanying drawings,
accessory implements 12 are operated by respective hydraulic actuators (not shown) connected hydraulically to an additional hydraulic circuit indicated as a whole by 15. - Additional
hydraulic circuit 15 is fitted at least partly to elongatedportions 3 and 4, and comprises a connectingvalve 16 fitted to elongated end portion 4; and a hydraulic-fluid feed pipe 18 connected at one end in known manner to a known user-operated hydraulic distributor (not shown), and at the other end to an inlet of connectingvalve 16. -
Feed pipe 18 comprises arigid portion 19 extending along, and connected firmly in known manner to,intermediate portion 3; and aflexible end portion 20, defined by a hose, which extends athinge axis 6, and is connected in fluidtight manner at one end torigid portion 19, and at the other end directly to the inlet of connectingvalve 16. - With reference to
Figure 3 , connectingvalve 16 comprises anouter casing 22 connected firmly, e.g. by means ofscrews 23, to oneleg 24 of an L-shaped supportingbracket 25, theother leg 26 of which extends parallel to and facing alateral wall 27 of elongated end portion 4, and is connected tolateral wall 27 by ahinge assembly 30 to enable rotation ofbracket 25, and therefore of connectingvalve 16, about afixed hinge axis 31 parallel toaxis 6. - With reference to
Figure 3 ,hinge assembly 30 comprises anut screw 33 fitted firmly, e.g. welded, to and projecting fromlateral wall 27 coaxially withaxis 31; and ascrew 34.Screw 34 comprises a threadedshank 35, an end portion of which is screwed insidenut screw 33, and a portion of which, extending fromhead 36 of the screw, extends through a collar orring 37 forced byhead 36 of the screw againstnut screw 33.Collar 37 engages in rotary manner a through hole formed inleg 26, and is of a length, measured parallel toaxis 31, approximately equal to but no less than the thickness ofleg 26, so thatbracket 25 rotates freely with respect toscrew 34 andcollar 37. - In actual use,
hinge assembly 30 allows connectingvalve 16 to rotate aboutaxis 31 with respect to end portion 4 of the arm, as end portion 4 rotates with respect tointermediate portion 3. Allowingvalve 16 to rotate reduces the forces exerted on bothhose 20 and thejoints connecting hose 20 torigid portion 19 and connectingvalve 16, thus prolonging the working life of bothhose 20 and the joints, and so reducing hydraulic fluid leakage and losses. - Moreover, as shown in
Figures 1 and2 , by allowing connectingvalve 16 to move with respect to elongated portion 4 of the arm to which it is connected, the length ofhose 20 can be reduced considerably as compared with known solutions, so thathose 20 remains completely facing the arm, regardless of the relative position ofelongated portions 3 and 4. In other words, regardless of the angular position of end portion 4 with respect tointermediate portion 3,hose 20 remains at all times inside a space defined at the bottom by a surface parallel toaxes bottom edge 40 ofarm 2. That is,hose 20, by never coming into contact with the material or ground below the arm, operates in the best working conditions at all times, with no impairment in its original characteristics and, hence, original efficiency and reliability. - Clearly, changes may be made to arm 2 as described herein without, however, departing from the scope as defined in the accompanying Claims. More specifically, connecting
valve 16 may be supported by brackets or fastening members other than the bracket described; andhinge assembly 30 may be formed differently from the one shown by way of example, while still allowing at least one rotation of connectingvalve 16 with respect to the elongated portion to which it is connected. - Moreover,
arm 2 as described herein may obviously form part of any machine other than the earthmoving machine described by way of example. In fact, the same problems referred to specifically in connection with earthmoving machines are obviously also encountered in other types of machines featuring articulated lifting, resisting, or supporting arms.
Claims (4)
- An articulated arm (2) for machines, comprising at least one elongated portion (4) hinged to rotate about a hinge axis (6) with respect to an adjacent connecting portion (3); and an additional hydraulic circuit (15) for feeding hydraulic fluid to accessory implements (12) connectable to the articulated arm (2); said additional hydraulic circuit (15) comprising hydraulic connecting valve means (16) for hydraulically connecting said accessory implements (12), and connecting means for connecting said connecting valve means (16) to said elongated portion (4); characterized in that said connecting means comprise hinge means (30) connected to a lateral wall (27) of said elongated portion (4) to permit rotation of said connecting valve means (16) about a rotation axis (31) parallel to said hinge axis(6).
- An arm (2) as claimed in Claim 1, characterized in that said hinge means (30) comprise a bracket (25) connected firmly to said connecting valve means (16); and a hinge pin (34) extending through said bracket (25) coaxially with said rotation axis (31) and connected firmly to said elongated portion (4).
- An arm as claimed in Claim 2, characterized in that said bracket (25) comprises a plate portion (26) having a through hole; and in that said hinge means (30) also comprise a collar (37) fitted to said hinge pin (34) and locked by the hinge pin (34) to said portion (26); said collar (37) engaging said through hole in rotary manner, and being of a length, measured in a direction parallel to said rotation axis (31), approximately equal to but no less than the thickness of said plate portion (26) measured in the same direction.
- An arm (2) as claimed in any one of the foregoing Claims, characterized in that said additional hydraulic circuit (15) also comprises a flexible pipe portion (20) extending at least partly at said hinge axis (6); said flexible pipe portion (20) being located inside a space defined at the bottom by a surface parallel to said hinge axis (6) and said rotation axis (31) and extending through a bottom peripheral edge (40) of said arm (2), regardless of the operating position of said elongated portion (4).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20070425848 EP2077356B1 (en) | 2007-12-31 | 2007-12-31 | Articulated arm for machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20070425848 EP2077356B1 (en) | 2007-12-31 | 2007-12-31 | Articulated arm for machines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2077356A1 EP2077356A1 (en) | 2009-07-08 |
EP2077356B1 true EP2077356B1 (en) | 2012-08-01 |
Family
ID=39368192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070425848 Active EP2077356B1 (en) | 2007-12-31 | 2007-12-31 | Articulated arm for machines |
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EP (1) | EP2077356B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5779154B2 (en) * | 2012-08-15 | 2015-09-16 | 日立建機株式会社 | Construction machinery |
JP6345087B2 (en) * | 2014-11-14 | 2018-06-20 | Kyb−Ys株式会社 | Equipment mounting structure |
FI126839B (en) | 2016-05-03 | 2017-06-15 | Ponsse Oyj | Arrangements in a working machine lifting device, working machine lifting device and working machine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0137633B2 (en) * | 1979-07-16 | 1989-08-08 | Caterpillar Mitsubishi Ltd | |
DE4007470C1 (en) * | 1990-03-09 | 1991-03-07 | O & K Orenstein & Koppel Ag, 1000 Berlin, De | Length compensator for hydraulic hose - consists of flexible section with loop between relatively hinged supports |
JP3443373B2 (en) * | 1999-09-13 | 2003-09-02 | コベルコ建機株式会社 | Hydraulic pipe piping structure |
JP3535079B2 (en) | 2000-06-27 | 2004-06-07 | 日本車輌製造株式会社 | Hydraulic piping structure of construction machinery |
JP2002250047A (en) | 2001-02-23 | 2002-09-06 | Hitachi Constr Mach Co Ltd | Pipe support structure for hydraulic back hoe |
-
2007
- 2007-12-31 EP EP20070425848 patent/EP2077356B1/en active Active
Also Published As
Publication number | Publication date |
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EP2077356A1 (en) | 2009-07-08 |
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