JP2009007760A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect hydraulic piping disposed at a working apparatus by restraining the hydraulic piping from projecting greatly to the outside of the working apparatus. <P>SOLUTION: A second vertical pin 19 for connecting a second boom 13 to a third boom 15 is composed of a hollow pin having a hollow hole 19A on the inner peripheral side, and second boom side hoses 31 constituting a hydraulic passage 29 for a bucket cylinder is connected to a third boom side pipe 32 by a connecting hose 34 disposed in the hollow hole 19A of the second vertical pin 19. Consequently, even if the second boom 13 and the third boom 15 are relatively turned around the second vertical pin 19, the second boom side hole 31 is restrained from being greatly deformed following the turning operation of the second and third booms 13, 15. The second boom side hose 31 can thereby be restrained from projecting greatly to the outside of the second boom 13 and protected from an external obstacle or the like. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with a working device suitably used for excavating work such as earth and sand.

  2. Description of the Related Art Generally, a hydraulic excavator as a construction machine is roughly configured by a self-propelled traveling body composed of a lower traveling body and an upper revolving body, and a work device provided on the upper revolving body of the traveling body so as to be able to move up and down. ing. Also, an offset boom type working device is known as a working device for a hydraulic excavator, and this offset boom type working device translates a work tool such as a bucket in the left and right directions using an offset cylinder or the like. Thus, excavation work such as a gutter can be performed on the left side or the right side of the traveling body.

  Here, the offset boom type working device is generally composed of a lower boom whose base end side is attached to the upper swinging body so as to be able to move up and down, and an upper boom that is pin-coupled to the distal end side of the lower boom so as to swing left and right. And an arm stay that is pin-coupled to the left end of the upper boom so that it can swing left and right, a link provided between the lower boom and the arm stay, and an arm stay that can be moved up and down on the front end side of the arm stay And a bucket attached to the tip side of the arm.

  Further, the offset type working device includes hydraulic actuators such as a boom cylinder for raising and lowering the lower boom, an arm cylinder for raising and lowering the arm, a bucket cylinder for rotating the bucket, and an offset cylinder for swinging the upper boom with respect to the lower boom. Is provided. Each of these hydraulic cylinders is connected to a hydraulic source provided on the upper swing body through a plurality of hydraulic pipes including hydraulic pipes, hydraulic hoses and the like.

  By the way, among the plurality of hydraulic pipes connected to each hydraulic cylinder, the hydraulic pipe for supplying and discharging pressure oil to and from the arm cylinder and the bucket cylinder is arranged along the lower boom, the upper boom, and the arm stay. In this case, the hydraulic piping is composed of a hydraulic pipe made of a metal pipe material and a hydraulic hose made of a material such as rubber having flexibility, a portion near the pin coupling portion between the lower boom and the upper boom, an upper boom, A hydraulic hose that deforms following the swinging of the upper boom and the arm stay in the left and right directions is usually disposed in the vicinity of the pin coupling portion with the arm stay.

  However, the hydraulic hose is disposed in a state of protruding from the work device in order to ensure a slack for following the swinging motion of the upper boom and the arm stay. For this reason, when a bucket etc. is immersed in a side groove at the time of excavation work, there exists a possibility that a hydraulic hose may contact a surrounding obstacle and may be damaged.

  On the other hand, the vertical pin for connecting the lower boom and the upper boom and the vertical pin for connecting the upper boom and the arm stay are formed in a cylindrical shape, and the rotary joint is provided on the inner peripheral side of the cylindrical vertical pin. Boom-type working devices have been proposed. According to this working device, it is possible to prevent the hydraulic hose from protruding outside the working device by connecting the hydraulic pipes to both ends of the rotary joint provided on the inner peripheral side of the vertical pin (for example, patent Reference 1).

JP-A-6-220879

  However, since the conventional technology of Patent Document 1 described above has a configuration in which a rotary joint is provided on the inner peripheral side of the vertical pin that connects the lower boom and the upper boom, the configuration of the vertical pin becomes complicated, and the assembly of the working device is difficult. In addition, the workability is reduced, and the manufacturing cost is increased.

  The present invention has been made in view of the above-described problems of the prior art, and it is possible to prevent the hydraulic piping arranged in the working device from greatly protruding outside the working device and to protect the hydraulic piping. The purpose is to provide machines.

  In order to solve the problems described above, the present invention includes a traveling body capable of self-propelling and a working device provided on the traveling body and operated by a hydraulic actuator. The working device includes a first arm member, a vertical arm, A second arm member connected to the first arm member via a pin so as to be able to rotate left and right; and a first arm member arranged to supply pressure oil to the hydraulic actuator. The present invention is applied to a construction machine constituted by the first hydraulic pipe thus constructed and the second hydraulic pipe arranged on the second arm member.

  A feature of the configuration adopted by the invention of claim 1 is that the vertical pin is constituted by a hollow pin whose inner peripheral side is a hollow hole penetrating in the axial direction, and in the hollow hole of the vertical pin, the first pin The connection pipe for connecting between the first hydraulic pipe and the second hydraulic pipe is provided.

  The invention of claim 2 includes a traveling body capable of self-propelling and a working device provided on the traveling body and actuated by a hydraulic actuator, the working device including a first arm member and a vertical pin. A second arm member connected to the first arm member so as to be pivotable left and right, and a first arm member disposed on the first arm member for supplying pressure oil to the hydraulic actuator. In a construction machine configured by a hydraulic pipe and a second hydraulic pipe disposed on the second arm member, the vertical pin is provided with an oil hole penetrating in an axial direction, and the shaft of the oil hole The first hydraulic pipe is connected to one side in the direction, and the second hydraulic pipe is connected to the other axial side of the oil hole.

  According to a third aspect of the present invention, the second arm member has an upper plate and a lower plate extending in the front and rear directions while facing in the upper and lower directions, and in the left and right directions across the upper and lower plates. The left side plate and the right side plate that face each other, and the second hydraulic pipe is arranged along the lower plate while being covered from the left and right sides by the left and right side plates. is there.

  According to a fourth aspect of the present invention, there is provided a connecting portion between an axial one side portion of the oil hole of the vertical pin and the first hydraulic pipe, an axial other side portion of the oil hole of the vertical pin, and the second hydraulic pressure. At least one of the connecting portions with the pipe is provided with a swivel joint that can rotate in the horizontal direction around the oil hole.

  According to a fifth aspect of the present invention, the work device is attached to the traveling body and is lifted and lowered in the upward and downward directions by a boom cylinder to be the first arm member, and on the distal end side of the first boom. A second boom that is connected using a first vertical pin and is rotated left and right by an offset cylinder and serves as the first or second arm member, and a second vertical pin on the distal end side of the second boom An offset boom type comprising a third boom which is held in parallel to the first boom by a link rod and is connected to the first boom in a state of being connected to be pivotable left and right using It is configured as a working device, and the vertical pin is at least one vertical pin of the first and second vertical pins.

  According to the first aspect of the present invention, the first arm member and the second arm member are rotatably connected by the vertical pin having the hollow hole, and the connection disposed in the hollow hole of the vertical pin. The first hydraulic pipe and the second hydraulic pipe can be connected via the pipe. In this case, by arranging the connection pipe in the hollow hole of the vertical pin, even if the first and second arm members are relatively rotated around the vertical pin, the first and second hydraulic pipes are The first and second arm members are not greatly deformed following the rotation of the second arm member.

  For this reason, it can suppress that the 1st, 2nd hydraulic piping protrudes outside the working apparatus, and can protect these 1st, 2nd hydraulic piping from an external obstruction. Further, for example, the configuration of the vertical pin can be simplified as compared with the case where the rotary joint is provided inside the vertical pin, so that the assembly of the working device can be improved and the manufacturing cost can be reduced.

  According to the second aspect of the present invention, the oil hole penetrating in the axial direction is formed in the vertical pin, the first hydraulic pipe is connected to one axial side of the oil hole, and the first hydraulic pipe is connected to the other axial side of the oil hole. Since the two hydraulic pipes are connected, pipes for connecting the first hydraulic pipe and the second hydraulic pipe can be eliminated. For this reason, it is not necessary to connect between the 1st hydraulic piping and the 2nd hydraulic piping via piping which consists of another member, and the piping does not touch the surrounding obstacle, and is not damaged. Therefore, the reliability of the working device can be increased.

  According to the invention of claim 3, the second hydraulic pipe is along the lower plate of the second arm member in a state where the second hydraulic pipe is covered from the left and right directions by the left and right side plates constituting the second arm member. Can be arranged. Thereby, it is possible to prevent the second hydraulic piping from coming into contact with surrounding obstacles and being damaged by the left and right side plates of the second arm member, and to protect the second hydraulic piping. it can.

  According to invention of Claim 4, when a swivel joint is provided in the connection part of the axial direction one side part of the oil hole of a vertical pin, and 1st hydraulic piping, it is the 1st arm member centering on a vertical pin. When the swivel joint rotates in the horizontal direction around the oil hole when the first arm member and the second arm member rotate relative to each other, the first hydraulic pipe can be prevented from being twisted, and the first hydraulic pressure can be suppressed. Piping can be protected. On the other hand, when the swivel joint is provided at the connecting portion between the other axial portion of the oil hole of the vertical pin and the second hydraulic pipe, the swivel joint can suppress the twist of the second hydraulic pipe. The second hydraulic pipe can be protected.

  According to the invention of claim 5, at least of the first vertical pin connecting the first boom and the second boom and the second vertical pin connecting the second boom and the third boom. One vertical pin is provided with a hollow hole in which a connecting pipe for connecting the first and second hydraulic pipes is provided, or an oil hole to which the first and second hydraulic pipes are connected, whereby the first and second hydraulic pipes are provided. It is possible to suppress the second hydraulic pipe from protruding outside the offset boom type working device.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a hydraulic excavator provided with an offset boom type working device will be described as an example and described in detail with reference to the accompanying drawings.

  First, FIG. 1 to FIG. 6 show a first embodiment of the present invention. Here, in the present embodiment, the first boom, the second boom pivotally connected to the tip end side of the first boom via the first vertical pin, and the tip end side of the second boom An offset boom type working device having a third boom pivotably connected via a second vertical pin is taken as an example. The second boom is a first arm member, and the third boom is a second. A case where the arm member is used will be described.

  A feature of the present embodiment is that the second vertical pin that connects the second boom that is the first arm member and the third boom that is the second arm member is a hollow that penetrates in the axial direction. A hole is provided, and a connection pipe for connecting the first hydraulic pipe and the second hydraulic pipe is disposed in the hollow hole of the second vertical pin.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling and is pivotably mounted on the lower traveling body 2. The upper rotating body 3 constituting the traveling body together with the traveling body 2 and an offset boom type working device 11 (described later) provided on the front side of the upper rotating body 3 so as to be able to move up and down are roughly constituted.

  Here, the upper revolving structure 3 is provided on the lower front side of the revolving frame 4 as a base provided on the lower traveling body 2 and on the left front side of the revolving frame 4, and includes a driver's seat, various levers (not shown). ), A building cover 6 that covers various mounting devices such as an engine and a hydraulic pump (not shown) mounted on the revolving frame 4 at the rear of the cab 5, and the revolving frame 4 and a counterweight 7 that balances the weight with a work device 11 described later.

  Reference numeral 11 denotes an offset boom type working device which is located on the right side of the cab 5 and is provided on the front side of the upper swing body 3 so as to be able to move up and down. This offset boom type working device 11 is used for excavating side grooves and the like. It is suitably used for work. Here, as shown in FIG. 2 and the like, the work device 11 includes a first boom 12, a second boom 13, a first vertical pin 14, a third boom 15, a second vertical pin 19, an arm 22, The bucket 23 and the cylinders 24, 25, 26, 27 and the like are included.

  A first boom 12 is attached to the front side of the revolving frame 4 so as to be able to move up and down, and the first boom 12 is formed as an elongated hollow structure whose front end is bent in a substantially square shape. Here, the base end side of the first boom 12 is pin-coupled to a boom mounting bracket (not shown) of the revolving frame 4 so as to be rotatable. Further, a bifurcated mounting bracket 12A spaced upward and downward is provided on the distal end side of the first boom 12 so as to protrude forward, and the proximal end side of the second boom 13 described later is provided on the mounting bracket 12A. It is configured to be pin-coupled.

  Further, three mounting plates 12B, 12C, and 12D project outwardly at predetermined intervals in the upward and downward directions on the left side surface on the distal end side of the first boom 12. One end of a link rod 21 described later is pin-coupled between the upper and intermediate mounting plates 12B and 12C, and the bottom side of an offset cylinder 25 described later is pinned between the intermediate and lower mounting plates 12C and 12D. Are combined.

  Reference numeral 13 denotes a second boom as a first arm member that is connected to the front end side of the first boom 12 using a first vertical pin 14 so as to be pivotable in the left and right directions. It is formed as a strong hollow structure having a rectangular tube shape. Here, a proximal end boss 13A having a substantially cylindrical shape is provided on the proximal end side (first boom 12 side) of the second boom 13, and the proximal end boss 13A is a mounting bracket for the first boom 12. 12A is pin-coupled via a first vertical pin 14 so as to be rotatable leftward and rightward (horizontal direction). On the other hand, a distal end boss 13B having a substantially cylindrical shape is also provided on the distal end side of the second boom 13, and a third boom 15 described later is pin-coupled to the distal end boss 13B.

  Further, a cylinder mounting plate 13C to which a rod side of an offset cylinder 25 described later is mounted is provided on the left side surface of the second boom 13, and a second boom side hose 28B of an arm cylinder hydraulic passage 28 described later is used for a bucket cylinder. A cylindrical hose holding member 13D that holds the second boom side hose 31 of the hydraulic passage 29 is attached.

  Reference numeral 15 denotes a third boom as a second arm member connected to the front end side of the second boom 13 by a second vertical pin 19 described later so as to be rotatable left and right. As shown in FIGS. 2 to 4, the upper plate 15A and the lower plate 15B extending in the front and rear directions while facing each other in the upper and lower directions, and the left and right directions sandwiching the upper plate 15A and the lower plate 15B. The left side plate 15C and the right side plate 15D that face each other are formed as a strong hollow structure having a rectangular tube shape as a whole. Further, the front end portions of the upper plate 15A and the lower plate 15B are connected by a connecting plate 15E bent in a square shape (see FIG. 2).

  Here, as shown in FIG. 6, the lower end portions of the left and right side plates 15C and 15D protrude downward from the lower surface of the lower plate 15B by a protruding dimension A, and these left and right side plates 15C and 15D. In a space surrounded by the lower plate 15B, a third boom side pipe 32 of a bucket cylinder hydraulic passage 29 described later is arranged.

  As shown in FIG. 3 and the like, the base end side (second boom 13 side) of the third boom 15 is provided with a pair of upper and lower link mounting plates 15F protruding leftward from the left side plate 15C. Yes. And the other end side of the link rod 21 mentioned later is pin-coupled to the link mounting plate 15F. In addition, a long hose insertion hole 15G through which a second boom side hose 28B of an arm cylinder hydraulic passage 28, which will be described later, is inserted is formed in the vicinity of the link attachment plate 15F in the left side plate 15C. .

  Reference numerals 16 and 16 denote mounting brackets provided on the base end side of the third boom 15, and each mounting bracket 16 is left to the front end side boss 13 </ b> B of the second boom 13 using a second vertical pin 19 described later. , Are pin-coupled so as to be rotatable in the right direction (horizontal direction). Here, the mounting brackets 16 face each other in the upward and downward directions with the front end side boss 13B of the second boom 13 interposed therebetween. As shown in FIGS. 3 and 5, each mounting bracket 16 has a pin insertion hole 16 </ b> A through which a second vertical pin 19 described later is inserted. A cylindrical collar 16B through which a stopper bolt 20 described later is inserted in the radial direction is fixedly provided on the upper surface side of the mounting bracket 16 positioned on the upper side.

  Reference numeral 17 denotes a cylinder mounting portion provided on the base end side of the left and right side plates 15C and 15D. Each cylinder mounting portion 17 is provided so as to protrude upward from the upper plate 15A, and a bottom side of an arm cylinder 26 to be described later is It can be pivotally attached. Reference numeral 18 denotes an arm mounting portion provided on the front end side of the left and right side plates 15C and 15D. As shown in FIG. 2, the arm mounting portion 18 protrudes forward from the connecting plate 15E, and is described below. 22 is attached so as to be rotatable upward and downward.

  Reference numeral 19 denotes a second vertical pin for connecting the second boom 13 and the third boom 15, and the second vertical pin 19 is provided on the third boom 15 as shown in FIGS. 3 to 5. The third boom 15 is rotated to the left and right with respect to the second boom 13 by being inserted into the pin insertion hole 16A of the mounting bracket 16 and the inner peripheral side of the front end boss 13B of the second boom 13. It is possible to connect.

  Here, the 2nd vertical pin 19 is comprised by the cylindrical hollow pipe from which the inner peripheral side became the hollow hole 19A penetrated to an axial direction. And in the state which connected the front end side boss | hub 13B of the 2nd boom 13 and the attachment bracket 16 of the 3rd boom 15 using the 2nd vertical pin 19, in the hollow hole 19A of the 2nd vertical pin 19, A connection hose 34 to be described later is provided. A stopper bolt 20 extending in the radial direction is provided between the collar 16B of the mounting bracket 16 and the upper end side of the second vertical pin 19, and the second vertical pin 19 is prevented from being pulled out by the stopper bolt 20. It is configured to stop.

  Reference numeral 21 denotes a link rod provided between the first boom 12 and the third boom 15. One end of the link rod 21 is pin-coupled between the mounting plates 12 </ b> B and 12 </ b> C of the first boom 12. The other end side is pin-coupled to the link mounting plate 15F of the third boom 15. The link rod 21 constitutes a parallel link for keeping the third boom 15 parallel to the first boom 12 at all times.

  Reference numeral 22 denotes an arm rotatably attached to the distal end side of the third boom 15, and the arm 22 is formed as a solid hollow structure having a rectangular tube shape as a whole. The base end side of the arm 22 is pin-coupled to the arm mounting portion 18 of the third boom 15 so as to be rotatable upward and downward, and the bucket 23 is pin-coupled to the distal end side of the arm 22 so as to be rotatable. Has been. A cylinder mounting plate 22A protrudes from the base end side of the arm 22, and a rod side of an arm cylinder 26, which will be described later, and a bottom side of the bucket cylinder 27 are pin-coupled to the cylinder mounting plate 22A.

  Reference numeral 24 denotes a boom cylinder provided between the upper swing body 3 and the first boom 12. The boom cylinder 24 rotates the first boom 12 upward and downward with respect to the upper swing body 3 (up and down movement). It is something to be made. Reference numeral 25 denotes an offset cylinder provided between the mounting plates 12C and 12D of the first boom 12 and the cylinder mounting plate 13C of the second boom 13. The offset cylinder 25 moves the third boom 15 with respect to the first boom 12. It translates left and right (offset).

  26 is an arm cylinder provided between the cylinder mounting portion 17 of the third boom 15 and the cylinder mounting plate 22A of the arm 22, and the arm cylinder 26 moves the arm 22 upward and downward with respect to the third boom 15. It is intended to rotate. A bucket cylinder 27 is provided between the cylinder mounting plate 22 </ b> A of the arm 22 and the bucket 23, and the bucket cylinder 27 rotates the bucket 23 with respect to the arm 22.

  Reference numeral 28 denotes an arm cylinder hydraulic passage. The arm cylinder hydraulic passage 28 connects between a hydraulic source (not shown) provided on the upper swing body 3 side and the arm cylinder 26, and is connected to the arm cylinder 26. Supply and discharge operating pressure oil. Here, as shown in FIG. 2, the arm cylinder hydraulic passage 28 includes a first boom side pipe 28A made of a metal pipe or the like disposed in the first boom 12, and a distal end side of the first boom side pipe 28A. And a flexible second boom side hose 28 </ b> B disposed on the second boom 13.

  Here, the base end side of the second boom side hose 28 </ b> B is connected to the distal end side of the first boom side pipe 28 </ b> A via a joint 28 </ b> C provided on the mounting plate 12 </ b> B of the first boom 12. Further, the second boom side hose 28 </ b> B extends along the second boom 13 to the third boom 15 while being held in the hose holding member 13 </ b> D of the second boom 13. The distal end side of the second boom side hose 28B is led out between the left and right side plates 15C and 15D through a hose insertion hole 15G formed in the left side plate 15C of the third boom 15, and the left and right side plates 15C. , 15D are connected to an arm cylinder 26.

  Reference numeral 29 denotes a bucket cylinder hydraulic passage. The bucket cylinder hydraulic passage 29 connects between a hydraulic pressure source (not shown) and the bucket cylinder 27, and supplies and discharges operating pressure oil to and from the bucket cylinder 27. Is. Here, as shown in FIGS. 2 and 3, the bucket cylinder hydraulic passage 29 includes a first boom side pipe 30, a second boom side hose 31, a third boom side pipe 32, and a third boom side hose 33, which will be described later. The connection hose 34 is used. The first boom side pipe 30, the second boom side hose 31, the third boom side pipe 32, the third boom side hose 33, and the connection hose 34 are respectively supplied with two pipes or hoses for supply and discharge. It is configured.

  30 and 30 are the 1st boom side pipes arrange | positioned at the 1st boom 12, and each 1st boom side pipe 30 is formed, for example using metal pipe materials etc., The base end side is hydraulic. It is connected to a hydraulic pressure source (both not shown) via a hose or the like. And the 1st boom side pipe 30 is extended to the 2nd boom 13 side along the 1st boom 12, and the front end side is mentioned later via joint 30A provided on the attachment board 12B of the 1st boom 12. The second boom side hose 31 is connected.

  Reference numerals 31 and 31 denote second boom-side hoses as first hydraulic pipes disposed on the second boom 13, and each second boom-side hose 31 is formed using a flexible material such as rubber, for example. The proximal end side is connected to the distal end side of the first boom side pipe 30 via a joint 30A. And the 2nd boom side hose 31 is extended to the 3rd boom 15 along this 2nd boom 13 in the state hold | maintained in the hose holding member 13D of the 2nd boom 13, The front end side is mentioned later. The connection hose 34 is connected to one end side.

  32 and 32 are the 3rd boom side pipes as the 2nd hydraulic piping arranged in the 3rd boom 15, and each 3rd boom side pipe 32 is formed using metal pipe materials etc., for example. The proximal end side is connected to the other end side of a connection hose 34 to be described later. And the 3rd boom side pipe 32 is extended to the arm 22 along the 3rd boom 15 in the state fixed to the lower board 15B of the 3rd boom 15 using the pipe fixture 32A, The front end side is mentioned later. It is connected to the third boom side hose 33.

  Here, as shown in FIG. 6, the lower ends of the left and right side plates 15C and 15D constituting the third boom 15 protrude downward from the lower plate 15B by the projection dimension A, and thus are fixed to the lower plate 15B. The third boom side pipe 32 is covered with left and right side plates 15C and 15D from the left and right directions, so that the third boom side pipe 32 can be protected from surrounding obstacles. Yes.

  Reference numeral 33 denotes a third boom side hose (only one is shown) disposed from the third boom 15 to the arm 22, and the third boom side hose 33 is formed using a flexible material such as rubber, for example. The proximal end side of the third boom side pipe 32 is connected to the distal end side. The distal end side of the third boom side hose 33 extends from the lower plate 15B of the third boom 15 to the cylinder mounting portion 22A of the arm 22 through the gap between the connecting plate 15E of the third boom 15 and the arm 22, It is connected to a bucket cylinder 27 attached to the cylinder attachment portion 22A.

  34 and 34 are connection hoses as connection pipes disposed in the hollow hole 19A of the second vertical pin 19, and as shown in FIGS. 3 to 5, the connection hose 34 is used as a first hydraulic pipe. It connects between the 2nd boom side hose 31 and the 3rd boom side pipe 32 as 2nd hydraulic piping.

  Here, the connection hose 34 is formed using a flexible material such as rubber, for example, and is loosely inserted into the hollow hole 19A of the second vertical pin 19, and the shaft of the second vertical pin 19 is inserted. Extending in the direction. Then, one end side (upper end side) of the connection hose 34 is connected to the distal end side of the second boom side hose 31 via the joint 34A, and the other end side (lower end side) of the connection hose 34 is connected to the third side via the joint 34B. The boom side pipe 32 is connected to the proximal end side.

  In this way, the second vertical pin 19 that connects the second boom 13 and the third boom 15 is constituted by a hollow pin having an inner peripheral side formed as a hollow hole 19A, thereby constituting a bucket cylinder hydraulic passage 29. By connecting the second boom side hose 31 and the third boom side pipe 32 by a connection hose 34 disposed in the hollow hole 19A of the second vertical pin 19, the second boom 13 and the third boom side hose 31 are connected. Even if the boom 15 rotates relative to the second vertical pin 19 as a center, the second boom-side hose 31 follows the rotating operation of the second and third booms 13 and 15 and the second boom 13 It has a configuration that can prevent it from protruding to the outside.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When excavating a side groove using the hydraulic excavator 1, first, the second boom 13, The third boom 15, arm 22, bucket 23, etc. are translated (offset) to the left or right side of the upper swing body 3. Then, in a state where the excavation position is determined, the boom cylinder 24, the arm cylinder 26, the bucket cylinder 27, and the like can be expanded and contracted, and the offset boom 12, the arm 22, the bucket 23, etc. are operated to excavate the side grooves. .

  Here, according to the present embodiment, the second vertical pin 19 that connects between the second boom 13 and the third boom 15 is configured by the hollow pin whose inner peripheral side is the hollow hole 19A, and the bucket Of the bucket cylinder hydraulic passage 29 that supplies and discharges the working hydraulic oil to and from the cylinder 27, the space between the second boom side hose 31 and the third boom side pipe 32 is within the hollow hole 19A of the second vertical pin 19. It is set as the structure connected by the connection hose 34 arrange | positioned in (3).

  As a result, even if the second boom 13 and the third boom 15 rotate relative to each other about the second vertical pin 19, the second boom 13 and the second boom 13 follow the rotating operation of the second boom 13 and 15. It can suppress that the boom side hose 31 deform | transforms greatly. For this reason, it can suppress that the 2nd boom side hose 31 protrudes largely outside the 2nd boom 13, and can protect this 2nd boom side hose 31 from an external obstruction.

  Moreover, the connection hose 34 is loosely inserted into the hollow hole 19A of the second vertical pin 19, one end side of the connection hose 34 is connected to the second boom side hose 31 via the joint 34A, and the other end side is connected to the joint 34B. Therefore, the configuration of the second vertical pin 19 is simplified as compared with the case where a rotary joint is provided inside the vertical pin as in the prior art, for example. Therefore, it is possible to improve the assembling property of the working device 11 and reduce the manufacturing cost.

  In the present embodiment, the second boom side hose 31 and the third boom side pipe 32 are connected via the connection hose 34 disposed in the hollow hole 19A of the first vertical pin 19. Thus, the third boom side pipe 32 can be disposed along the lower plate 15B of the third boom 15. Therefore, for example, piping connected to the bucket cylinder 27 does not need to be led out to the upper plate 15A side through the hose insertion hole 15G formed in the left side plate 15C of the third boom 15, and disposed along the upper plate 15A. .

  For this reason, as shown in FIG. 2, only the second boom side hose 28B of the arm cylinder hydraulic passage 28 needs to be inserted into the hose insertion hole 15G of the third boom 15, and accordingly, the hose insertion hole 15G is provided. It can be formed small. As a result, the strength reduction of the third boom 15 due to the provision of the hose insertion hole 15G can be suppressed, and the number of components such as the reinforcing member can be reduced. It can also contribute to cost reduction.

  Further, since the third boom side pipe 32 can be disposed along the lower plate 15B of the third boom 15, for example, the pipe connected to the bucket cylinder 27 is connected to the upper plate 15A of the third boom 15 and the arm. Compared with the case where it is arranged in a narrow space between the cylinder 26, the degree of freedom in design can be increased.

  Further, by arranging the third boom side pipe 32 along the lower plate 15B of the third boom 15, the third boom side hose 33 connected to the distal end side of the third boom side pipe 32 is changed to the third boom side. The boom 15 can be extended to the bucket cylinder 27 through a gap between the connecting plate 15 </ b> E of the boom 15 and the arm 22. Thereby, the clearance gap formed between the connection board 15E of the 3rd boom 15 and the arm 22 can be made into the narrow clearance | interval which only the 3rd boom side hose 33 passes. As a result, it is possible to suppress a decrease in strength on the distal end side of the third boom 15 provided with the arm attachment portion 18 and to reduce the number of parts such as reinforcing members, thereby reducing the weight of the entire work device 11 and the manufacturing cost. Can also contribute.

  Moreover, as shown in FIG. 6, the lower ends of the left and right side plates 15C and 15D constituting the third boom 15 protrude downward from the lower plate 15B by the projection dimension A, and are thus fixed to the lower plate 15B. The third boom side pipe 32 can be covered from the left and right directions by the left and right side plates 15C and 15D. Thereby, the 3rd boom side pipe 32 can be protected from a surrounding obstruction.

  Next, FIG. 7 to FIG. 9 show a second embodiment of the present invention. The feature of this embodiment is that an oil hole penetrating in the axial direction is provided in a vertical pin, and one axial direction of this oil hole is provided. The first hydraulic piping is connected to the side, and the second hydraulic piping is connected to the other side in the axial direction of the oil hole. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes a second vertical pin for connecting the second boom 13 and the third boom 15, and the second vertical pin 41 is connected to the second vertical pin 19 according to the first embodiment. Instead, it is the one used in this embodiment. Here, as shown in FIGS. 7 to 9, the second vertical pin 41 according to the present embodiment is formed of a solid round bar having a cylindrical shape, and each oil hole 43 (described later) is formed therein. Is provided.

  The second vertical pin 41 is inserted into the pin insertion hole 16 </ b> A of the mounting bracket 16 provided in the third boom 15 and the inner peripheral side of the distal end side boss 13 </ b> B of the second boom 13. The third boom 15 is connected to the boom 13 so as to be rotatable leftward and rightward (horizontal direction).

  Reference numeral 42 denotes a bucket cylinder hydraulic passage. The bucket cylinder hydraulic passage 42 is substantially the same as the bucket cylinder hydraulic passage 29 according to the first embodiment, and the first boom side pipe 30 (see FIG. 2), the second The boom side hose 31, the third boom side pipe 32, the third boom side hose 33 (see FIG. 2), oil holes 43 to be described later, and the like.

  Reference numerals 43 and 43 denote two oil holes provided in the second vertical pin 41. These oil holes 43 are used in this embodiment in place of the connection hose 34 according to the first embodiment. A part of the bucket cylinder hydraulic passage 42 is configured. Here, the respective oil holes 43 are arranged so as to be spaced apart from each other in the radial direction of the second vertical pin 41, and penetrate the axial direction of the second vertical pin 41. Further, female screw holes are respectively screwed into the opening end of one end side 43A in the axial direction of each oil hole 43 and the opening end of the other end side 43B in the axial direction.

  Then, a second boom side hose 31 as a first hydraulic pipe is connected to one end side 43A of each oil hole 43 via a swivel joint 44 described later, and to the other end side 43B of each oil hole 43, A third boom side pipe 32 as a second hydraulic pipe is connected via a swivel joint 45 described later.

  Reference numeral 44 denotes a swivel joint provided at a connection portion between the one end side 43 </ b> A of the oil hole 43 and the second boom side hose 31. The swivel joint 44 includes a fixed joint portion 44 </ b> A screwed to the one end side 43 </ b> A of the oil hole 43. The rotary joint portion 44B rotates around the axial center of the fixed joint portion 44A. Accordingly, when the third boom 15 rotates left and right with respect to the second boom 13 around the second vertical pin 41, the fixed joint portion of the swivel joint 44 connected to the one end side 43A of the oil hole 43. With respect to 44A, when the rotary joint portion 44B rotates in the horizontal direction around the oil hole 43, the twist of the second boom side hose 31 connected to the rotary joint portion 44B can be suppressed. Yes.

  Reference numeral 45 denotes a swivel joint provided at a connection portion between the other end side 43 </ b> B of the oil hole 43 and the third boom side pipe 32, and the swivel joint 45 is a fixed joint portion screwed into the other end side 43 </ b> B of the oil hole 43. 45A and a rotary joint portion 45B that rotates about the axial center of the fixed joint portion 45A. Therefore, when the third boom 15 rotates left and right with respect to the second boom 13 around the second vertical pin 41, the fixed joint portion of the swivel joint 45 connected to one end side 43 </ b> A of the oil hole 43. With respect to 45A, the rotary joint portion 45B rotates in the horizontal direction around the oil hole 43, so that the third boom side pipe 32 connected to the rotary joint portion 45B can be used for the rotation operation of the third boom 15. It is the structure which can be made to follow.

  The hydraulic excavator according to the present embodiment has the above-described configuration, and the basic operation thereof is not particularly different from that according to the first embodiment described above.

  However, according to the present embodiment, the second vertical pin 41 connecting the second boom 13 and the third boom 15 is provided with the oil holes 43, 43 penetrating in the axial direction, The second boom side hose 31 is connected to one end side 43 </ b> A in the axial direction of the oil hole 43, and the third boom side pipe 32 is connected to the other end side 43 </ b> B in the axial direction of each oil hole 43.

  For this reason, it is not necessary to connect between the 2nd boom side hose 31 and the 3rd boom side pipe 32 via piping which consists of another member, and this piping contacts with the surrounding obstruction and is damaged. Therefore, the reliability of the working device 11 can be improved.

  Moreover, a swivel joint 44 is provided at the connection portion between the one end side 43A of the oil hole 43 and the second boom side hose 31, and a swivel is provided at the connection portion between the other end side 43B of the oil hole 43 and the third boom side pipe 32. The joint 45 is provided. As a result, the swivel joint 44 prevents the second boom side hose 31 from being twisted when the third boom 15 rotates left and right with respect to the second boom 13 around the second vertical pin 41. be able to. Further, the third boom side pipe 32 fixed to the third boom 15 can appropriately follow the turning operation of the third boom 15.

  In the first embodiment described above, the connection hose 34 is disposed in the hollow hole 19A of the second vertical pin 19 that connects the second boom 13 and the third boom 15, and this connection hose. The case where one end side of 34 is connected to the second boom side hose 31 via the joint 34A and the other end side of the connection hose 34 is connected to the third boom side pipe 32 via the joint 34B is illustrated. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 10, the distal end side of the second boom side hose 31 is extended and inserted into the hollow hole 19 </ b> A of the second vertical pin 19. The distal end portion of the second boom side hose 31 protruding from the second vertical pin 19 may be connected to the third boom side pipe 32 via the joint 46.

  Further, in the first embodiment described above, the case where the third boom side pipe 32 made of a pipe material such as metal is used as the second hydraulic pipe fixed to the third boom 15 is illustrated. However, the present invention is not limited to this. For example, the second hydraulic pipe may be configured by a flexible hose. The same applies to the second embodiment.

  In the first embodiment described above, the second boom 13 is used as the first arm member, the third boom 15 is used as the second arm member, and the space between the second boom 13 and the third boom 15 is set. The case where the hollow hole 19A is provided in the 2nd vertical pin 19 to connect, and the connection hose 34 which comprises a part of bucket hydraulic path 29 in this hollow hole 19A is illustrated. However, the present invention is not limited to this. For example, the first boom 12 is a first arm member, the second boom 13 is a second arm member, and between the first boom 12 and the second boom 13 is used. It is good also as a structure which provides a hollow hole in the 1st vertical pin 14 which connects these, and arrange | positions a connection hose in the said hollow hole.

  Further, not only the hollow holes 19A are provided only in the second vertical pins 19, but also the first vertical pins 14 and the second vertical pins 19 are provided with hollow holes, and these first and second vertical pins are provided. It is good also as a structure which arrange | positions the connection hose which comprises some hydraulic passages 29 for bucket cylinders in the hollow hole provided in 14 and 19. FIG.

  In the second embodiment described above, the second boom 13 is the first arm member, the third boom 15 is the second arm member, and the space between the second boom 13 and the third boom 15 is set. The case where the oil hole 43 which comprises a part of hydraulic path 42 for bucket cylinders is provided in the 2nd vertical pin 41 to connect is illustrated. However, the present invention is not limited to this. For example, the first boom 12 is used as the first arm member, the second boom 13 is used as the second arm member, and the first boom 12 and the second boom 13 are connected to each other. It is good also as a structure which provides the oil hole which comprises a part of hydraulic path 42 for bucket cylinders in the 1st vertical pin to do.

  Further, not only the oil hole 43 is provided in the second vertical pin 41, but also the oil hole constituting a part of the bucket cylinder hydraulic passage 42 in both the first vertical pin 14 and the second vertical pin 41. It is good also as a structure which provides.

  In the second embodiment described above, the swivel joint 44 is provided on one end side 43 </ b> A of the oil hole 43 provided on the second vertical pin 41, and the swivel joint 45 is provided on the other end side 43 </ b> B of the oil hole 43. The case is illustrated. However, the present invention is not limited to this. For example, the swivel joint 45 may be provided only on the other end side 43 </ b> B of the oil hole 43.

  Furthermore, in embodiment mentioned above, the hydraulic shovel provided with the offset boom type working apparatus 11 which consists of the 1st boom 12, the 2nd boom 13, and the 3rd boom 15 is illustrated. However, the present invention is not limited to this, and can also be applied to a hydraulic excavator including an offset boom type working device including a lower boom and an upper boom, for example.

It is a front view showing a hydraulic excavator provided with an offset boom type working device by a 1st embodiment of the present invention. It is a front view which shows a working device alone. It is an exploded view which shows a 2nd boom, a 3rd boom, a 2nd vertical pin, a connection hose, etc. It is the top view which looked at the 2nd boom, the 3rd boom, the 2nd vertical pin, the 2nd boom side hose, etc. from the arrow IV-IV direction in FIG. It is the longitudinal cross-sectional view which looked at the 2nd boom, the 3rd boom, the 2nd vertical pin, the connection hose, etc. from the arrow VV direction in FIG. It is sectional drawing which looked at the 3rd boom, the 3rd boom side pipe, etc. from the arrow VI-VI direction in FIG. FIG. 4 is an exploded view similar to FIG. 3 showing a second boom, a third boom, a second vertical pin, an oil hole, and the like according to the second embodiment of the present invention. It is a top view similar to FIG. 4 which shows a 2nd boom, a 3rd boom, a 2nd vertical pin, a 2nd boom side hose, etc. It is the longitudinal cross-sectional view which looked at the 2nd boom, the 3rd boom, the 2nd vertical pin, the oil hole, etc. from the arrow IX-IX direction in FIG. FIG. 4 is an exploded view similar to FIG. 3 showing a modification of the first embodiment.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body (running body)
3 Upper swing body (running body)
DESCRIPTION OF SYMBOLS 11 Working apparatus 12 1st boom 13 2nd boom 14 1st vertical pin 15 3rd boom 15A Upper plate 15B Lower plate 15C Left plate 15D Right side plate 19,41 2nd vertical pin 19A Hollow hole 22 Arm 23 Bucket 24 Boom Cylinder (hydraulic actuator)
25 Offset cylinder (hydraulic actuator)
26 Arm cylinder (hydraulic actuator)
27 Bucket cylinder (hydraulic actuator)
29, 42 Bucket cylinder hydraulic passage 31 Second boom hose (first hydraulic piping)
32 Third boom side pipe (second hydraulic piping)
34 Connection hose (connection piping)
43 Oil hole 44, 45 Swivel joint

Claims (5)

A self-propelled traveling body, and a working device provided on the traveling body and operated by a hydraulic actuator,
The working device includes a first arm member, a second arm member connected to the first arm member via a vertical pin so as to be rotatable left and right, and pressure oil to the hydraulic actuator. In a construction machine constituted by a first hydraulic pipe disposed on the first arm member for supply and a second hydraulic pipe disposed on the second arm member,
The vertical pin is constituted by a hollow pin whose inner peripheral side is a hollow hole penetrating in the axial direction, and the first hydraulic pipe and the second hydraulic pipe are connected in the hollow hole of the vertical pin. A construction machine characterized in that a connecting pipe is provided. A self-propelled traveling body, and a working device provided on the traveling body and operated by a hydraulic actuator,
The working device includes a first arm member, a second arm member connected to the first arm member via a vertical pin so as to be rotatable left and right, and pressure oil to the hydraulic actuator. In a construction machine constituted by a first hydraulic pipe disposed on the first arm member for supply and a second hydraulic pipe disposed on the second arm member,
The vertical pin is provided with an oil hole penetrating in the axial direction, the first hydraulic pipe is connected to one axial side of the oil hole, and the second hydraulic pipe is connected to the other axial side of the oil hole. Construction machinery characterized in that it is configured to connect the hydraulic piping. The second arm member includes an upper plate and a lower plate extending in the front and rear directions while facing in the upper and lower directions, and a left plate and a right plate facing in the left and right directions with the upper plate and the lower plate interposed therebetween. And consisting of
The construction machine according to claim 1 or 2, wherein the second hydraulic pipe is arranged along the lower plate in a state of being covered from the left and right directions by the left and right side plates.   A connecting portion between one axial portion of the vertical pin oil hole and the first hydraulic pipe, and a connecting portion between the second axial portion of the vertical pin oil hole and the second hydraulic pipe. 4. The construction machine according to claim 2, wherein at least one of the connecting portions is provided with a swivel joint that is rotatable in a horizontal direction around the oil hole. The working device uses a first boom that is attached to the traveling body and moves up and down by a boom cylinder and serves as the first arm member, and a first vertical pin on the distal end side of the first boom. And a second boom that is connected to the left and right by an offset cylinder and serves as the first or second arm member, and a second vertical pin on the tip side of the second boom. A third boom that is held in parallel to the first boom by a link rod in a state of being pivotally connected to the first boom, and is configured as an offset boom type working device.
The construction machine according to claim 1, 2, 3, or 4, wherein the vertical pin is at least one vertical pin of the first and second vertical pins.

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