EP2233643B1 - Two-member structure with a two-member connecting device - Google Patents

Two-member structure with a two-member connecting device Download PDF

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Publication number
EP2233643B1
EP2233643B1 EP10155361.8A EP10155361A EP2233643B1 EP 2233643 B1 EP2233643 B1 EP 2233643B1 EP 10155361 A EP10155361 A EP 10155361A EP 2233643 B1 EP2233643 B1 EP 2233643B1
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EP
European Patent Office
Prior art keywords
pin
pin insertion
bracket
insertion holes
brackets
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
EP10155361.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2233643A3 (en
EP2233643A2 (en
Inventor
Manabu Ogasawara
Atsushi Hoshino
Minoru Itou
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of EP2233643A2 publication Critical patent/EP2233643A2/en
Publication of EP2233643A3 publication Critical patent/EP2233643A3/en
Application granted granted Critical
Publication of EP2233643B1 publication Critical patent/EP2233643B1/en
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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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • 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
    • E02F3/369—Devices to connect parts of a boom or an arm
    • 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

Definitions

  • the present invention relates to a two-member connecting device which is suitably used in connecting together two members of such as a plurality of booms used in, for example, a hydraulic excavator.
  • a hydraulic excavator equipped with a working mechanism for demolition work is suitably used.
  • This working mechanism for demolition work generally has a plurality of booms, which is called a multi-boom, and an arm is mounted to a distal end side of an uppermost-stage boom among the booms, a working tool such as a crusher, a grapple, or the like being attached to a distal end side of the arm.
  • Two adjacent booms in the multi-boom for demolition work are arranged to be connected to each other by inserting connecting pins into pin insertion holes provided in one boom and pin insertion holes provided in the other boom.
  • each module has a standardized coupling arrangement. It is an object to provide a design that will provide the machine owner with the flexibility of a single set of attachments that may be suitable for use with any of a variety of construction machines from different manufacturers.
  • the positioning pin fixed on one boom is arranged at a position spaced apart from the pin insertion hole. For this reason, there is a problem in that when after the engagement of the hook member provided on the other boom with the positioning pin, the one boom is lifted up and is thereby rotated about the positioning pin, it is difficult to effect the positioning of the pin insertion hole of the one boom and the pin insertion hole of the other boom.
  • the hydraulic cylinders for constituting the upper and lower pin inserting/withdrawing mechanisms are disposed so as to be capable of extending and contracting in the direction perpendicular to the axis of the left and right upper connecting pins and the left and right lower connecting pins, even in a case where the interval between the left and right first brackets is narrow, the upper and lower pin inserting/withdrawing mechanisms can be easily disposed between these left and right first brackets.
  • the above described preferred aspects of the present invention can be combined partly or as a whole to form further preferred aspects of the invention.
  • a hydraulic excavator In the drawings, indicated at 1 is a hydraulic excavator, and the hydraulic excavator 1 is largely constituted by an automotive crawler-type lower traveling structure 2, an upper revolving structure 3 mounted rotatably on top of the lower traveling structure 2, and a multi-boom type working mechanism 4 provided tiltably on the front side of the upper revolving structure 3.
  • This hydraulic excavator 1 is suitably used for demolishing a structure having a large ground height such as a high-rise building.
  • the working mechanism 4 is largely constituted by a boom 5 consisting of a lower boom 5A mounted rotatably on a front portion side of the upper revolving structure, an extension boom 5B, and an upper boom 5C; a middle arm 6 mounted rotatably on a distal end side of the upper boom 5C; an arm 7 consisting of a lower arm 7A and an upper arm 7B mounted rotatably on a distal end side of the middle arm 6; and a crusher 8 serving as a working tool mounted rotatably on a distal end side of the upper arm 7B.
  • the arrangement adopted is such that, as shown in Fig. 2 , for example, the extension boom 5B is lifted by using a hydraulic crane 9 or the like, and the lower boom 5A and the extension boom 5B are connected by using a below-described two-member connecting device 11 in a state in which the extension boom 5B is disposed on a distal end side of the lower boom 5A.
  • Designated at 11 is the two-member connecting device for connecting the lower boom 5A serving as a first member and the extension boom 5B serving as a second member.
  • This two-member connecting device 11 is comprised of left and right first brackets 12 and 13, left and right upper first pin insertion holes 12C and 13C, left and right lower first pin insertion holes 12D and 13D, left and right second brackets 14 and 15, left and right upper second pin insertion holes 14A and 15A, left and right lower second pin insertion holes 14B and 15B, left and right upper connecting pins 16 and 17, left and right lower connecting pins 18 and 19, upper and lower pin inserting/withdrawing mechanisms 20 and 31, left and right upper centering members 33, and left and right lower centering members 34, and the like, which will be described hereinafter.
  • this left first bracket 12 is constituted by a left inner first bracket 12A and a left outer first bracket 12B which are opposed to each other in the left-right direction at a fixed interval.
  • the left inner first bracket 12A and the left outer first bracket 12B are each formed by use of a thick-walled steel plate or the like.
  • left inner first bracket 12A and the left outer first bracket 12B are secured to the distal end portion of the lower boom 5A with a rectangular tubular shape by welding or other similar means, and extend vertically from an upper corner portion 5A1 to a lower corner portion 5A2 of the lower boom 5A (see Fig. 3 ).
  • the below-described left second bracket 14 is configured to be disposed between the left inner first bracket 12A and the left outer first bracket 12B.
  • the left upper first pin insertion holes 12C, 12C are respectively bored in upper end portions of the left inner first bracket 12A and the left outer first bracket 12B, while the left lower first pin insertion holes 12D, 12D are respectively bored in lower end portions of the left inner first bracket 12A and the left outer first bracket 12B.
  • the below-described left upper connecting pin 16 is inserted in the left upper first pin insertion holes 12C in such a manner as to be capable of being inserted and withdrawn
  • the below-described left lower connecting pin 18 is inserted in the left lower first pin insertion holes 12D in such a manner as to be capable of being inserted and withdrawn.
  • Designated at 13 is the right first bracket provided on the right side of a distal end portion of the lower boom 5A.
  • This right first bracket 13 is constituted by a right inner first bracket 13A and a right outer first bracket 13B which are opposed to each other in the left-right direction at a fixed interval.
  • the right inner first bracket 13A and the right outer first bracket 13B are each formed by use of a thick-walled steel plate or the like, and extend vertically from the upper corner portion 5A1 to the lower corner portion 5A2 of the lower boom 5A in a state in which the right inner first bracket 13A and the right outer first bracket 13B are secured to the distal end portion of the lower boom 5A by welding or other similar means.
  • the below-described right second bracket 15 is configured to be disposed between the right inner first bracket 13A and the right outer first bracket 13B.
  • the right upper first pin insertion holes 13C, 13C are respectively bored in upper end portions of the right inner first bracket 13A and the right outer first bracket 13B, while the right lower first pin insertion holes 13D, 13D are respectively bored in lower end portions of the right inner first bracket 13A and the right outer first bracket 13B.
  • the below-described right upper connecting pin 17 is inserted in the right upper first pin insertion holes 13C in such a manner as to be capable of being inserted and withdrawn
  • the below-described right lower connecting pin 19 is inserted in the right lower first pin insertion holes 13D in such a manner as to be capable of being inserted and withdrawn.
  • the left upper first pin insertion holes 12C bored in the left inner first bracket 12A and the left outer first bracket 12B of the left first bracket 12 and the right upper first pin insertion holes 13C bored in the right inner first bracket 13A and the right outer first bracket 13B of the right first bracket 13 are disposed on an identical axis 01 - 01.
  • the left lower first pin insertion holes 12D bored in the left inner first bracket 12A and the left outer first bracket 12B of the left first bracket 12 and the right lower first pin insertion holes 13D bored in the right inner first bracket 13A and the right outer first bracket 13B of the right first bracket 13 are disposed on an identical axis 02 - 02.
  • Denoted at 14 is the left second bracket provided on the left side of a proximal end portion of the extension boom 5B serving as the second member, and this left second bracket 14 is formed by a thick-walled steel plate or the like.
  • the left second bracket 14 is secured to the proximal end portion of the extension boom 5B with a rectangular tubular shape by welding or other similar means, and extends vertically from an upper corner portion 5B1 to a lower corner portion 5B2 of the extension boom 5B.
  • the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B of the left first bracket 12, and opposes the left inner first bracket 12A and the left outer first bracket 12B in the left-right direction (see Fig. 14 ).
  • the left upper second pin insertion hole 14A is bored at a position corresponding to the left upper first pin insertion holes 12C of the left first bracket 12, while, in a lower end portion of the left second bracket 14, the left lower second pin insertion hole 14B is bored at a position corresponding to the left lower first pin insertion holes 12D of the left first bracket 12.
  • Designated at 15 is the right second bracket provided on the right side of the proximal end portion of the extension boom 5B.
  • This right second bracket 15 is formed by a thick-walled steel plate or the like, and extend vertically from the upper corner portion 5B1 to the lower corner portion 5B2 of the extension boom 5B in a state in which the right second bracket 15 is secured to the proximal end portion of the extension boom 5B by welding or other similar means.
  • the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B of the right first bracket 13, and opposes the right inner first bracket 13A and the right outer first bracket 13B in the left-right direction.
  • the right upper second pin insertion hole 15A is bored at a position corresponding to the right upper first pin insertion holes 13C of the right first bracket 13, while, in a lower end portion of the right second bracket 15, the right lower second pin insertion hole 15B is bored at a position corresponding to the right lower first pin insertion holes 13D of the right first bracket 13.
  • the left upper second pin insertion hole 14A of the left second bracket 14 and the right upper second pin insertion hole 15A of the right second bracket 15 are arranged to be aligned with the left upper first pin insertion holes 12C of the left first bracket 12 and the right upper first pin insertion holes 13C of the right first bracket 13 as the identical axis 01 - 01.
  • the left lower second pin insertion hole 14B of the left second bracket 14 and the right lower second pin insertion hole 15B of the right second bracket 15 are arranged to be aligned with the left lower first pin insertion holes 12D of the left first bracket 12 and the right lower first pin insertion holes 13D of the right first bracket 13 as the identical axis 02 - 02.
  • the left and right upper centering members 33 and the left and right lower centering members 34 which will be described hereinafter, are arranged to be disposed between the left and right second brackets 14 and 15.
  • Denoted at 16 is the left upper connecting pin which is inserted in the left upper first pin insertion holes 12C of the left first bracket 12 and the left upper second pin insertion hole 14A of the left second bracket 14. As the left upper connecting pin 16 is moved between the disengaged position shown in Fig. 5 and the connecting position shown in Fig. 6 , the left upper connecting pin 16 is inserted into and withdrawn from the left upper second pin insertion hole 14A. As shown in Fig.
  • the left upper connecting pin 16 is formed into a stepped cylindrical shape extending in the left-right direction by a large diameter portion 16A which is slidably inserted in the left upper first pin insertion holes 12C and the left upper second pin insertion hole 14A and by a small diameter portion 16B having a smaller outside dimension D2 (D1 > D2) than an outside dimension D1 of the large diameter portion 16A.
  • a notched portion 16C which radially penetrates is formed in the small diameter portion 16B, and a distal end portion of a below-described left link 23 is arranged to be inserted in that notched portion 16C.
  • the right upper connecting pin which is inserted in the right upper first pin insertion holes 13C of the right first bracket 13 and the right upper second pin insertion hole 15A of the right second bracket 15.
  • the right upper connecting pin 17 is inserted into and withdrawn from the right upper second pin insertion hole 15A.
  • the right upper connecting pin 17 is also constituted by a large diameter portion 17A which is slidably inserted in the right upper first pin insertion holes 13C and the right upper second pin insertion hole 15A, a small diameter portion 17B having a smaller diameter than that large diameter portion 17A, and a notched portion 17C.
  • a distal end portion of a below-described right link 26 is adapted to be inserted into the notched portion 17C.
  • Indicated at 18 is the left lower connecting pin which is inserted in the left lower first pin insertion holes 12D of the left first bracket 12 and the left lower second pin insertion hole 14B of the left second bracket 14. As the left lower connecting pin 18 is moved between the disengaged position shown in Fig. 5 and the connecting position shown in Fig. 6 , the left lower connecting pin 18 is inserted into and withdrawn from the left lower second pin insertion hole 14B. As shown in Fig.
  • the left lower connecting pin 18 is formed into a stepped cylindrical shape extending in the left-right direction by a large diameter portion 18A which is slidably inserted in the left lower first pin insertion holes 12D and the left lower second pin insertion hole 14B and by a small diameter portion 18B having the smaller outside dimension D2 (D1 > D2) than the outside dimension D1 of the large diameter portion 18A.
  • a notched portion 18C which radially penetrates is formed in the small diameter portion 18B, and a distal end portion of a below-described left link 23 is arranged to be inserted in that notched portion 18C.
  • the right lower connecting pin which is inserted in the right lower first pin insertion holes 13D of the right first bracket 13 and the right lower second pin insertion hole 15B of the right second bracket 15.
  • the right lower connecting pin 19 is inserted into and withdrawn from the right lower second pin insertion hole 15B.
  • the right lower connecting pin 19 is also constituted by a large diameter portion 19A which is slidably inserted in the right lower first pin insertion holes 13D and the right lower second pin insertion hole 15B, a small diameter portion 19B having a smaller diameter than that large diameter portion 19A, and a notched portion 19C.
  • a distal end portion of the below-described left link 26 is adapted to be inserted into the notched portion 19C.
  • Designated at 20 is the upper pin inserting/withdrawing mechanism arranged between the left first bracket 12 and the right first bracket 13.
  • This upper pin inserting/withdrawing mechanism 20 inserts and withdraws the left upper connecting pin 16 with respect to the left upper second pin insertion hole 14A of the left second bracket 14, and inserts and withdraws the right upper connecting pin 17 with respect to the right upper second pin insertion hole 15A of the right second bracket 15.
  • the upper pin inserting/withdrawing mechanism 20 is constituted by a hydraulic cylinder 21, a floating link 22, a left link 23, a right link 26, and the like, which will be described hereinafter.
  • This hydraulic cylinder 21 is constituted by a tube 21A, a piston (not shown), and a rod 21B having a proximal end side fixed to the piston and a distal end side projecting from the tube 21A.
  • This hydraulic cylinder 21 is disposed in a state of being capable of extending and contracting in the same direction (left-right direction) as the axis 01 - 01 of the left and right upper connecting pins 16 and 17 at a position spaced apart vertically from the position of the axis 01 - 01 of the left and right upper connecting pins 16 and 17.
  • Indicated at 22 is the floating link which is disposed at a position vertically spaced apart from the position of the axis 01 - 01 of the left and right upper connecting pins 16 and 17.
  • This floating link 22 is mounted to neither of the left and right first brackets 12 and 13, is set in a floating state with respect to these left and right first brackets 12 and 13, and extends in the left-right direction.
  • the floating link 22 constitutes a fulcrum for allowing the left and right upper connecting pins 16 and 17 respectively connected to the below-described left and right links 23 and 26 to move in the left-right direction in correspondence with the extension or contraction of the hydraulic cylinder 21.
  • the floating link 22 is formed in the shape of a rectangular rod extending in the left-right direction, and the lengthwise dimension in the left-right direction of the floating link 22 is set to be slightly smaller than the interval between the left inner first bracket 12A and the right inner first bracket 13A.
  • a U-shaped recessed groove 22A is formed in each of both end portions in the left-right direction of the floating link 22, and the recessed groove 22A is slidably engaged with a below-described rotation restricting member 29.
  • the floating link 22 is disposed between the left and right upper connecting pins 16 and 17 and the hydraulic cylinder 21.
  • One side in the left-right direction of the floating link 22 is rotatably pin-connected to the below-described left link 23, while the other side in the left-right direction of the floating link 22 is rotatably connected to the below-described right link 26.
  • the left link 23 for connecting the left upper connecting pin 16 and the hydraulic cylinder 21 through the floating link 22.
  • the left link 23 as a whole is formed by a block extending in the vertical direction, and a proximal end side of the left link 23 is formed as a notched portion 23A by being notched into a bifurcated shape with a fixed interval. Further, a distal end portion of the rod 21B of the hydraulic cylinder 21 is rotatably pin-connected to the notched portion 23A of the left link 23 by use of a pin 24.
  • a distal end portion of the left link 23 in a state of being inserted in the notched portion 16C of the left upper connecting pin 16 is rotatably pin-connected to that left upper connecting pin 16 by use of a pin 25.
  • a stopper 23B projecting toward the left first bracket 12 is provided on the distal end side of the left link 23. The stopper 23B abuts against the left inner first bracket 12A when the left upper connecting pin 16 has moved to the connecting position shown in Fig. 6 , to thereby set the connecting position of the left upper connecting pin 16.
  • Denoted at 26 is the right link for connecting the right upper connecting pin 17 and the hydraulic cylinder 21 through the floating link 22.
  • This right link 26 as a whole is formed by a block extending in the vertical direction, and a proximal end side of the right link 26 is formed as a notched portion 26A by being notched into a bifurcated shape with a fixed interval. Further, the bottom side of the tube 21A of the hydraulic cylinder 21 is rotatably pin-connected to the notched portion 26A of the right link 26 by use of a pin 24.
  • a distal end portion of the right link 26 in a state of being inserted in the notched portion 17C of the right upper connecting pin 17 is rotatably pin-connected to that right upper connecting pin 17 by use of a pin 25.
  • a stopper 26B projecting toward the right first bracket 13 is provided on the distal end side of the right link 26. The stopper 26B abuts against the right inner first bracket 13A when the right upper connecting pin 17 has moved to the connecting position shown in Fig. 6 , to thereby set the connecting position of the right upper connecting pin 17.
  • one side (left side) in the left-right direction of the floating link 22 in a state of being inserted in the notched portion 23A of the left link 23 is rotatably pin-connected to a longitudinally intermediate portion of that left link 23 by use of a pin 27.
  • the other side (right side) in the left-right direction of the floating link 22 in a state of being inserted in the notched portion 26A of the right link 26 is rotatably pin-connected to a longitudinally intermediate portion of that right link 26 by use of a pin 28.
  • the left upper connecting pin 16 is inserted into the left upper first pin insertion holes 12C of the left first bracket 12 and the left upper second pin insertion hole 14A of the left second bracket 14.
  • the right upper connecting pin 17 is arranged to be inserted into the right upper first pin insertion holes 13C of the right first bracket 13 and the right upper second pin insertion hole 15A of the right second bracket 15 (see Fig. 14 ).
  • the left upper connecting pin 16 is withdrawn from the left upper first pin insertion holes 12C of the left outer first bracket 12A and the left upper second pin insertion hole 14A of the left second bracket 14.
  • the right upper connecting pin 17 is arranged to be withdrawn from the right upper first pin insertion holes 13C of the right outer first bracket 13B and the right upper second pin insertion hole 15A of the right second bracket 15.
  • Indicated at 29 are the left and right rotation restricting members which are respectively provided on the left and right first brackets 12 and 13.
  • These rotation restricting members 29 are constituted by elongated plates extending in the vertical direction, and are respectively secured to the inner side surface of the left inner first bracket 12A and the inner side surface of the right inner first bracket 13A by welding or other similar means.
  • the recessed grooves 22A provided in the both end portions of the floating link 22 are respectively slidably engaged with the left and right rotation restricting members 29.
  • the arrangement provided is such that when the left and right upper connecting pins 16 and 17 are moved between the connecting position and the disengaged position by the extension and contraction of the hydraulic cylinder 21, the recessed grooves 22A formed in the both end portions of the floating link 22 are engaged with the rotation restricting members 29, thereby making it possible to prevent the upper pin inserting/withdrawing mechanism 20 from rotating about the left and right upper connecting pins 16 and 17.
  • Designated at 30 is a tabular upper stopper which is provided on the lower boom 5A by being positioned between the left and right first brackets 12 and 13.
  • This upper stopper 30 has a proximal end side secured to the upper end portion of the lower boom 5A by using welding or other similar means and a distal end side extending to a position where it opposes the left and right upper connecting pins 16 and 17. Further, as shown in Fig. 5 , as the small diameter portions 16B and 17B of the left and right upper connecting pins 16 and 17 abut against this upper stopper 30, the upper stopper 30 sets the disengaging position of the left and right upper connecting pins 16 and 17.
  • Denoted at 31 is the lower pin inserting/withdrawing mechanism arranged between the left first bracket 12 and the right first bracket 13.
  • This lower pin inserting/withdrawing mechanism 31 inserts and withdraws the left lower connecting pin 18 with respect to the left lower second pin insertion hole 14B of the left second bracket 14, and inserts and withdraws the right lower connecting pin 19 with respect to the right lower second pin insertion hole 15B of the right second bracket 15.
  • the lower pin inserting/withdrawing mechanism 31 is constituted by the hydraulic cylinder 21 disposed at a position spaced apart vertically from the position of the axis 02 - 02 of the left and right lower connecting pins 18 and 19, the floating link 22 disposed in a floating state between the hydraulic cylinder 21 and the left and right lower connecting pins 18 and 19, and the left and right links 23 and 26 for connecting the left and right lower connecting pins 18 and 19 and the hydraulic cylinder 21 through the floating link 22.
  • the notched portion 23A on the proximal end side of the left link 23 is pin-connected to the rod 21B of the hydraulic cylinder 21 by use of the pin 24; the distal end portion of the left link 23 is pin-connected to the left lower connecting pin 18 by use of the pin 25; and a longitudinally intermediate portion of the left link 23 is pin-connected to the floating link 22 by use of the pin 27.
  • the notched portion 26A on the proximal end side of the right link 26 is pin-connected to the tube 21A of the hydraulic cylinder 21 by use of the pin 24; the distal end portion of the right link 26 is pin-connected to the right lower connecting pin 19 by use of the pin 25; and a longitudinally intermediate portion of the right link 26 is pin-connected to the floating link 22 by use of the pin 28.
  • Indicated at 32 is a tabular lower stopper which is provided on the lower boom 5A by being positioned between the left and right first brackets 12 and 13.
  • This lower stopper 32 has a proximal end side secured to the lower end side of the lower boom 5A by using welding or other similar means and a distal end side extending to a position where it opposes the left and right lower connecting pins 18 and 19.
  • the lower stopper 32 sets the disengaging position of the left and right lower connecting pins 18 and 19.
  • denoted at 33 are the left and right upper centering members which are provided on the extension boom 5B. These upper centering members 33 are for aligning the axis of the left and right upper connecting pins 16 and 17 with the axis 01 - 01 of the left and right upper first pin insertion holes 12C and 13C and the left and right upper second pin insertion holes 14A and 15A at the time of inserting the left and right upper connecting pins 16 and 17 into the upper first pin insertion holes 12C and 13C provided in the left and right first brackets 12 and 13 and into the upper second pin insertion holes 14A and 15A provided in the left and right second brackets 14 and 15.
  • the left upper centering member 33 is arranged at a position opposing the left second bracket 14 in such a manner as to sandwich the left inner first bracket 12A when the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B. Meanwhile, the right upper centering member 33 is arranged at a position opposing the right second bracket 15 in such a manner as to sandwich the right inner first bracket 13A when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B (see Fig. 12 ).
  • the upper centering members 33 are formed in a substantially triangular shape as a whole by use of a thinner plate than the left and right second brackets 14 and 15, and extend from the upper corner portion 5B1 of the extension boom 5B to positions corresponding to the left and right upper second pin insertion holes 14A and 15A while opposing the left and right second brackets 14 and 15 in parallel thereto.
  • the upper centering member 33 is largely constituted by a mounting portion 33A secured to the upper corner portion 5B1 of the extension boom 5B by using welding or other similar means, a projecting portion 33B projecting in a chevron shape from this mounting portion 33A, and an engaging groove portion 33C which is formed by downwardly recessing a distal end portion of the projecting portion 33B and is curved in a circular arc shape by surrounding the left and right upper second pin insertion holes 14A and 15A.
  • the engaging groove portion 33C is formed with a circular arc shape having a substantially radius of curvature equal to that of the left and right upper second pin insertion holes 14A and 15A, and is adapted to engage the left and right upper connecting pins 16 and 17 from above.
  • the lower side of the engaging groove portion 33C is formed as a tapered opening portion 33D which is more open than the diameter of the left and right upper second pin insertion holes 14A and 15A, and the left and right upper connecting pins 16 and 17 are each arranged to be guided into the engaging groove portion 33C along this opening portion 33D.
  • the engaging groove portions 33C have a radius of curvature substantially equal to that of the left and right upper second pin insertion holes 14A and 15A, as the engaging groove portions 33C of the left and right upper centering members 33 are engaged with the left and right upper connecting pins 16 and 17, the axis of the left and right upper connecting pins 16 and 17 can be aligned with the axis 01 - 01 of the left and right upper second pin insertion holes 14A and 15A.
  • the left and right upper centering members 33 cause the axis of the left and right upper connecting pins 16 and 17 to be aligned with the axis 01 - 01 of the left and right upper second pin insertion holes 14A and 15A.
  • the arrangement provided is such that the upper pin inserting/withdrawing mechanisms 20 make it possible to smoothly insert the left and right upper connecting pins 16 and 17 with respect to the upper first pin insertion holes 12C and 13C of the left and right first brackets 12 and 13 and the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15.
  • Denoted at 34 are the left and right lower centering members which are provided on the extension boom 5B. These lower centering members 34 are for aligning the axis of the left and right lower connecting pins 18 and 19 with the axis 02 - 02 of the left and right lower first pin insertion holes 12D and 13D and the left and right lower second pin insertion holes 14A and 15A at the time of inserting the left and right lower connecting pins 18 and 19 into the lower first pin insertion holes 12D and 13D provided in the left and right first brackets 12 and 13 and into the lower second pin insertion holes 14B and 15B provided in the left and right second brackets 14 and 15.
  • the left lower centering member 34 is arranged at a position opposing the left second bracket 14 in such a manner as to sandwich the left inner first bracket 12A when the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B. Meanwhile, the right lower centering member 34 is arranged at a position opposing the right second bracket 15 in such a manner as to sandwich the right inner first bracket 13A when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B.
  • the lower centering members 34 are formed in a substantially triangular shape as a whole by use of a thinner plate than the left and right second brackets 14 and 15, and extend from the lower corner portion 5B2 of the extension boom 5B to positions corresponding to the left and right lower second pin insertion holes 14B and 15B while opposing the left and right second brackets 14 and 15 in parallel thereto.
  • the lower centering member 34 is largely constituted by a mounting portion 34A secured to the lower corner portion 5B2 of the extension boom 5B by using welding or other similar means, a projecting portion 34B projecting in a chevron shape from this mounting portion 34A, and an abutting groove portion 34C which is formed by recessing a distal end portion of the projecting portion 34B toward the extension boom 5B side and is curved in a circular arc shape along the left and right lower second pin insertion holes 14B and 15B.
  • the abutting groove portion 34C is formed with a circular arc shape having a radius of curvature substantially equal to that of the left and right lower second pin insertion holes 14B and 15B, and is adapted to engage the left and right lower connecting pins 18 and 19 from the front-back direction (direction of arrow A in Fig. 11 ).
  • the extension boom 5B rotates in the front-back direction (direction of arrow A) about the left and right upper connecting pins 16 and 17 inserted in the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15.
  • the abutting groove portions 34C of the left and right lower centering members 34 respectively abut against the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 projecting from the left and right inner first brackets 12A and 13A.
  • the abutting groove portions 34C have a radius of curvature substantially equal to that of the left and right lower second pin insertion holes 14B and 15B, as the abutting groove portions 34C of the left and right lower centering members 34 abut against the left and right lower connecting pins 18 and 19, the axis of the left and right lower connecting pins 18 and 19 can be aligned with the axis 02 - 02 of the left and right lower second pin insertion holes 14B and 15B.
  • the left and right lower centering members 34 cause the axis of the left and right lower connecting pins 18 and 19 to be aligned with the axis 02 - 02 of the left and right lower second pin insertion holes 14B and 15B.
  • the arrangement provided is such that the lower pin inserting/withdrawing mechanisms 31 make it possible to smoothly insert the left and right lower connecting pins 18 and 19 with respect to the lower first pin insertion holes 12D and 13D of the left and right first brackets 12 and 13 and the lower second pin insertion holes 14B and 15B of the left and right second brackets 14 and 15.
  • the two-member connecting device 11 in accordance with this embodiment has the above-described configuration, and a description will next be given of a case where the extension boom 5B is mounted to the distal end side of the lower boom 5A for constituting the boom 5 of the hydraulic excavator 1 by use of this two-member connecting device 11.
  • the extension boom 5B is lifted by use of the hydraulic crane 9, and the proximal end side of this extension boom 5B is disposed on the distal end side of the lower boom 5A mounted on the upper revolving structure 3 of the hydraulic excavator 1.
  • the upper pin inserting/withdrawing mechanism 20 causes the left upper connecting pin 16 to be inserted in the left upper first pin insertion hole 12C of the left inner first bracket 12A and the right upper connecting pin 17 to be inserted in the right upper first pin insertion hole 13C of the right inner first bracket 13A.
  • the upper pin inserting/withdrawing mechanism 20 is set in a disengaged position and is held between the left inner first bracket 12A and the right inner first bracket 13A, and portions of the large diameter portions 16A and 17A of the left and right upper connecting pins 16 and 17 project inwardly from the left and right inner first brackets 12A and 13A.
  • the lower pin inserting/withdrawing mechanism 31 also causes the left lower connecting pin 18 to be inserted in the left lower first pin insertion hole 12D of the left inner first bracket 12A and the right lower connecting pin 19 to be inserted in the right lower first pin insertion hole 13D of the right inner first bracket 13A.
  • the lower pin inserting/withdrawing mechanism 31 is set in a disengaged position and is held between the left inner first bracket 12A and the right inner first bracket 13A, and portions of the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 project inwardly from the left and right inner first brackets 12A and 13A.
  • the extension boom 5B lifted by the hydraulic crane 9 is moved downward toward the lower boom 5A, and the engaging groove portions 33C of the left and right upper centering members 33 are engaged from above with the large diameter portions 16A and 17A of the left and right upper connecting pins 16 and 17 projecting from the left and right inner first brackets 12A and 13A.
  • the axis of the left and right upper connecting pins 16 and 17 can be aligned with the axis 01 - 01 of the left and right upper second pin insertion holes 14A and 15A.
  • the left and right second brackets 14 and 15 are rotated in the front-back direction (direction of arrow A in Fig. 11 ) about the left and right upper connecting pins 16 and 17.
  • the abutting groove portions 34C of the left and right lower centering members 34 are abutted against the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 projecting from the left and right inner first brackets 12A and 13A, thereby making it possible to align the axis of the left and right lower connecting pins 18 and 19 with the axis 02 - 02 of the left and right lower second pin insertion holes 14B and 15B.
  • the left and right first brackets 12 and 13 provided on the lower boom 5A and the left and right second brackets 14 and 15 provided on the extension boom 5B are connected by use of the left and right upper connecting pins 16 and 17 and the left and right lower connecting pins 18 and 19, thereby making it possible to mount the extension boom 5B to the distal end side of the lower boom 5A.
  • a clearance ⁇ D corresponding to the difference between the outside dimension D1 of the large diameter portion 16A and the outside dimension D2 of the small diameter portion 16B is formed between the engaging groove portions 33C of the left and right upper centering members 33 and the upper connecting pins 16 and 17 (see Fig. 14 ).
  • the engaging groove portions 34C of the left and right lower centering members 34 oppose the small diameter portions 18B and 19B of the lower connecting pins 18 and 19.
  • the clearance ⁇ D corresponding to the difference between the outside dimension D1 of the large diameter portion 18A and the outside dimension D2 of the small diameter portion 18B is formed between the engaging groove portions 34C of the left and right lower centering members 34 and the lower connecting pins 18 and 19 (see Fig. 13 ).
  • the load which is transmitted between the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 through the left and right upper connecting pins 16 and 17 can be suppressed from being transmitted to the left and right upper centering members 33.
  • the load which is transmitted between the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 through the left and right lower connecting pins 18 and 19 can be suppressed from being transmitted to the left and right lower centering members 34.
  • the left and right upper centering members 33 and lower centering members 34 can be formed by using thin-walled plates, so that it is possible to attain a reduction in their weight.
  • the configuration provided is such that the left and right upper centering members 33 and lower centering members 34 are provided at positions respectively opposing the left and right second brackets 14 and 15 in such a manner as to sandwich the left and right inner first brackets 12A and 13A in the extension boom 5B.
  • the axis of the left and right upper connecting pins 16 and 17 can be aligned with the axis 01 - 01 of the upper second pin insertion holes 14A and 15A provided in the left and right second brackets 14 and 15.
  • the axis of the left and right lower connecting pins 18 and 19 can be aligned with the axis 02 - 02 of the lower second pin insertion holes 14B and 15B provided in the left and right second brackets 14 and 15.
  • the left and right upper connecting pins 16 and 17 can be smoothly inserted into the left and right upper first pin insertion holes 12C and 13C and the left and right upper second pin insertion holes 14A and 15A
  • the left and right lower connecting pins 18 and 19 can be smoothly inserted into the left and right lower first pin insertion holes 12D and 13D and the left and right lower second pin insertion holes 14B and 15B.
  • the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 can be speedily connected by use of the left and right upper connecting pins 16 and 17 and the left and right lower connecting pins 18 and 19, making it possible to enhance workability at the time of connecting the extension boom 5B to the lower boom 5A.
  • the upper and lower pin inserting/withdrawing mechanisms 20 and 31 are each constituted by the hydraulic cylinder 21 disposed in such a manner as to extend in the left-right direction, the floating link 22, and the left and right links 23 and 26.
  • the present invention is not limited to the same, for example, the upper and lower pin inserting/withdrawing mechanisms 41 and 42 may be used as in a modification shown in Fig. 15 .
  • the upper and lower pin inserting/withdrawing mechanisms 41 and 42 may be constituted by a hydraulic cylinder 43 disposed so as to be capable of extending and contracting in a direction (vertical direction) perpendicular to the axis of the left and right upper connecting pins 16 and 17, a floating link 44 which is pin-connected to one end side of the hydraulic cylinder 43, a left first link 45 connecting the left upper connecting pin 16 and the floating link 44, a right first link 46 connecting the right upper connecting pin 17 and the floating link 44, a left second link 47 connecting the other end side of the hydraulic cylinder 43 and the left first link 45, and a right second link 48 connecting the other end side of the hydraulic cylinder 43 and the right first link 46.
  • a configuration may be provided such that a hydraulic cylinder having left and right two rods is disposed coaxially with the left and right upper connecting pins 16 and 17, and the left rod is connected to the left upper connecting pin 16, while the right rod is connected to the right upper connecting pin 17.
  • the left first bracket 12 is constituted by two plates including the left inner first bracket 12A and the left outer first bracket 12B
  • the right first bracket 13 is constituted by two plates including the right inner first bracket 13A and the right outer first bracket 13B.
  • the present invention is not limited to the same, for example, the left first bracket may be constituted by the left inner first bracket 12A alone, and the right first bracket may be constituted by the right inner first bracket 13A alone.
  • the two-member connecting device 11 is used for the connecting portion between the lower boom 5A and the extension boom 5B among the lower boom 5A, the extension boom 5B, and the upper boom 5C constituting the boom 5 of the hydraulic excavator 1.
  • two-member connecting device 11 may also be used for such as the connecting portion between the extension boom 5B, the upper boom 5C, the connecting portion between the lower arm 7A and the upper arm 7B which constituting the arm 7, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Shovels (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Jib Cranes (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Earth Drilling (AREA)
EP10155361.8A 2009-03-27 2010-03-03 Two-member structure with a two-member connecting device Active EP2233643B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009079628A JP4806049B2 (ja) 2009-03-27 2009-03-27 ２部材連結装置

Publications (3)

Publication Number Publication Date
EP2233643A2 EP2233643A2 (en) 2010-09-29
EP2233643A3 EP2233643A3 (en) 2014-09-24
EP2233643B1 true EP2233643B1 (en) 2017-05-31

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ID=42226458

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Application Number Title Priority Date Filing Date
EP10155361.8A Active EP2233643B1 (en) 2009-03-27 2010-03-03 Two-member structure with a two-member connecting device

Country Status (4)

Country Link
EP (1) EP2233643B1 (zh)
JP (1) JP4806049B2 (zh)
KR (1) KR101656743B1 (zh)
CN (1) CN101845833B (zh)

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JP5499230B2 (ja) * 2010-02-24 2014-05-21 尼崎重機株式会社 建設機械の作業機
JP5367646B2 (ja) * 2010-06-10 2013-12-11 日立建機株式会社 ２部材連結装置
CN102953402B (zh) * 2011-08-31 2015-07-08 陈海水 俯撑式挖泥抓杆局部结构
CN105731276B (zh) * 2014-12-09 2018-12-25 三一汽车起重机械有限公司 连接头及工程机械
WO2016199722A1 (ja) * 2015-06-11 2016-12-15 株式会社タダノ 伸縮ブームの取付構造
CN105065381A (zh) * 2015-07-17 2015-11-18 江苏南铸科技股份有限公司 一种改进连接件
CN106467275B (zh) * 2015-08-18 2019-08-27 徐工集团工程机械股份有限公司 一种基本臂连接结构及随车折臂起重机
CN105649127B (zh) * 2016-03-24 2018-06-12 徐工集团工程机械股份有限公司科技分公司 一种快换属具连接机构
CN107178340B (zh) * 2017-07-12 2020-03-20 徐工集团工程机械有限公司 横梁结构及钻机
CN107178339B (zh) * 2017-07-12 2020-03-24 徐工集团工程机械有限公司 横梁结构及钻机
CN107700575B (zh) * 2017-09-15 2020-06-30 安徽合矿环境科技股份有限公司 一种连接装置
CN110042875B (zh) * 2019-05-06 2021-09-07 江苏徐工工程机械研究院有限公司 工程机械
CN110817717A (zh) * 2019-11-20 2020-02-21 李天民 一种基于建筑施工用的一体化安全吊装设备
JP7404209B2 (ja) * 2020-09-25 2023-12-25 日立建機株式会社 建設機械のピン結合装置

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Also Published As

Publication number Publication date
CN101845833A (zh) 2010-09-29
KR20100108258A (ko) 2010-10-06
JP4806049B2 (ja) 2011-11-02
EP2233643A3 (en) 2014-09-24
JP2010230113A (ja) 2010-10-14
EP2233643A2 (en) 2010-09-29
KR101656743B1 (ko) 2016-09-12
CN101845833B (zh) 2014-09-03

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