JP5163510B2 - Piping structure of greasing pipe for construction machinery - Google Patents

Description

  The present invention is a construction in which a plurality of greasing pipes for supplying grease to a plurality of pin coupling portions provided on a boom of a construction machine such as a hydraulic excavator are extended in the boom longitudinal direction along the boom. The present invention relates to a piping structure of a greasing pipe of a machine.

  A boom that is attached to a main body of a construction machine so as to be able to move up and down is usually provided with a machine main body, a boom cylinder, an arm cylinder, and the like, and a plurality of pin coupling portions that couple the boom to each other via a coupling pin. These pin joints are regularly supplied with grease in order to prevent malfunctions caused by friction between the hole walls of the through holes formed in the pin joints and the connecting pins and wear of these hole walls and connecting pins. (Grease) is necessary.

  By the way, in the boom of a construction machine, since the pin coupling part which is a grease supply location is disperse | distributed to the longitudinal direction of the said boom, the operator who performs manual (manual feed) lubrication sequentially between grease supply locations. There is a problem that the greasing work needs to be performed while moving, and the workability during greasing is poor.

In order to solve such problems, in recent years, a plurality of greasing pipes have been extended in the boom longitudinal direction along the boom of the construction machine, and a greasing port provided at one end of the greasing pipe has been supported. In addition to being connected to each of the plurality of pin coupling portions, the greasing ports provided at the other end portion of the greasing pipe for supplying grease from the outside are concentratedly arranged at one place (base end portion of the boom). There are many such piping structures (for example, refer patent document 1).
JP 2004-137676 A

  By the way, for example, on the boom tip side of a hydraulic excavator (construction machine), there is provided an arm cylinder for turning an arm that is rotatably connected to the tip of the boom. As described above, the greasing port for supplying is provided on the boom base end side where a space can be easily secured. More specifically, the greasing port is concentrated on the upper surface on the boom base end side so as to avoid interference with a pair of left and right boom cylinders provided on both the left and right sides of the boom in order to raise and lower the boom.

However, for example, a greasing pipe concentrated on the upper surface of the boom base end side of a large construction machine such as a hydraulic excavator having a bucket capacity of 0.5 m ³ or more has the following problems. That is, in a large hydraulic excavator, the position of the connecting portion between the boom and the excavator body inevitably increases because the lower traveling body becomes larger. Along with this, the position of the greasing port centrally arranged on the upper surface of the base end portion of the boom becomes high, and it is difficult to supply grease from the outside to the greasing port while the operator is standing on the ground. Become.

  For this reason, when an operator performs greasing, an assisting tool such as a stepladder is prepared, and the user feels bothered and inferior in greasing workability (smooth and quick greasing is difficult). ) Problem.

  The present invention has been made in view of such points, and an object thereof is construction for supplying grease to a plurality of pin coupling portions provided on a boom which is attached to a main body of a construction machine so as to be raised and lowered. An object of the present invention is to provide a piping structure for a greasing pipe that can perform a smooth and quick greasing operation while an operator stands on the ground.

  In order to achieve the above object, according to the present invention, even a large construction machine in which the position of the connecting portion between the boom and the machine body is high, the height from the ground can be freely adjusted by raising and lowering the boom. The greasing port of the greasing pipe is arranged in a concentrated manner at the tip of the boom that can be adjusted.

  According to a first aspect of the present invention, there is provided a construction machine in which a plurality of grease supply pipes for supplying grease to a plurality of pin coupling portions provided on a boom of the construction machine are extended in the boom longitudinal direction along the boom. The boom has a piping structure for a greasing pipe, wherein the boom is pivotally connected to a distal end portion, and a base end portion is attached to the main body of the construction machine so as to be raised and lowered. The grease pipe is connected to the plurality of pin coupling portions corresponding to the first grease supply port provided at one end portion, while the second grease supply port provided at the other end portion is the tip end portion of the boom. It is characterized by being centrally arranged.

  According to the first invention, the second greasing ports of the plurality of greasing pipes are concentrated on the tip of the boom, so that the operator sequentially moves between the pin coupling portions that are greasing locations. There is no need, and smooth and quick greasing work can be performed.

  Moreover, since the 2nd greasing port of a greasing pipe is arrange | positioned at the front-end | tip part instead of the base end part of the boom attached to the main body of a construction machine, if the front-end | tip of a boom is lowered | hung (boom is laid down), the said boom The height of the 2nd greasing port arrange | positioned at the front-end | tip part becomes the height below an operator's height. Thereby, the worker can perform the greasing work more smoothly and quickly while standing on the ground without using an auxiliary tool such as a stepladder.

  A second invention is characterized in that, in the first invention, the second grease ports of the plurality of grease pipes are arranged on one side surface near the tip of the boom. is there.

  By the way, for example, an arm cylinder for rotating the arm is disposed on the upper surface of the boom of the hydraulic excavator. Therefore, when the second greasing port is disposed on the upper surface near the tip of the boom, the arm cylinder is It gets in the way and makes greasing difficult. In order to avoid this, it is conceivable that the greasing pipe is bent 90 degrees in the vicinity of the tip portion and arranged with the second greasing port directed in the direction of the side of the boom, but the greasing pipe is bent suddenly, There arises a problem that it becomes difficult to lubricate due to resistance.

  Here, according to the second invention, since the second greasing ports of the plurality of greasing pipes are arranged on one side surface near the tip of the boom, the arm cylinder does not get in the way and can be easily performed. The greasing work can be done.

  In addition, since some of the connecting pins to be lubricated are located on the upper surface of the boom, a part of the greasing piping is arranged on the upper surface of the boom, but the upper surface of the boom is not bent sharply. Therefore, the greasing resistance does not increase remarkably.

  Furthermore, since the connection pin used as the lubrication object of an arm and a bucket is near from the boom tip part vicinity, greasing workability | operativity improves.

  A third invention is characterized in that, in the second invention, the second grease ports of the plurality of grease pipes are arranged so as to open toward the front end side in the boom longitudinal direction. is there.

  According to the third aspect of the invention, by arranging the second greasing port so as to open toward the front end side in the boom longitudinal direction, it is possible to suppress the bending of the pipe and reduce the greasing resistance.

  In the present invention, the “second greasing port” means not a grease nipple to which grease is directly supplied by a hand grease gun or the like but a “cap” provided at the other end of the greasing pipe.

  According to the piping structure of the greasing pipe of the construction machine according to the present invention, the second greasing ports of the plurality of greasing pipes are concentrated on the distal end portion rather than the base end portion of the boom attached to the main body of the construction machine so as to be raised and lowered. Since the position of the second greasing port is lowered by lowering the boom, the operator stood on the ground without sequentially moving between the pin coupling portions that are the greasing locations. Smooth and quick greasing work can be performed in the state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 shows a side view of a hydraulic excavator provided with a boom having a piping structure for a greasing pipe of a construction machine according to the present invention, FIG. 2 shows a side view of the boom, and FIG. A top view is shown, FIG. 4 shows a top view of the boom base end side, and FIG. 5 shows a partial detailed view of the boom tip. In FIG. 3, the arm cylinder 55 is indicated by a two-dot chain line for easy understanding of the drawing.

Hydraulic excavator 1 shown in FIG. 1, the bucket capacity is a hydraulic excavator of 0.5 m ³ grade, and a shovel main body 3, and a front attachment 5 is mounted liftable the excavator main body 3. In addition, the code | symbol P in FIG. 1 shows the operator who performs maintenance etc. of a hydraulic shovel.

  The excavator body 3 includes a lower traveling body 9 equipped with a crawler 9a, and an upper revolving body 7 having a cab 11 for a driver's cab that is rotatably mounted on the upper portion of the lower traveling body 9. ing.

  The front attachment 5 is disposed on the right side of the cab 11 in the excavator body 3, and includes a boom 15 that is attached to the shovel body 3 so as to be able to rise and fall, and an arm 25 that is rotatably connected to the distal end portion 15 a of the boom 15. And a bucket 35 rotatably connected to the tip of the arm 25 via a connecting pin 35a. 1 is an idler link whose base end portion is rotatably connected to the vicinity of the distal end portion of the arm 25 via a connecting pin 69a. Reference numeral 71 is an end portion connected to the bucket 35. It is a bucket link that is rotatably connected via a pin 71b.

  As shown in FIG. 2, the boom 15 has a substantially boomerang shape having a curved portion 15 c that swells in an arc shape on the upper side. Further, the boom 15 includes a shovel body 3, boom cylinders 45 and 45 for raising and lowering the boom 15, an arm cylinder 55 and an arm 25 for rotating the arm 25, and the boom 15. Four pin coupling portions 17, 19, 21, and 23 that are connected via 17 a, 19 a, 21 a, and 23 a are provided.

  More specifically, as shown in FIGS. 1 to 4, a first end 15b of the boom 15 is connected to the upper swing body 7 via a boom foot pin 17a so that the boom 15 can be raised and lowered. A 1-pin coupling portion 17 is provided. Moreover, the 2nd pin coupling | bond part 19 to which the boom cylinders 45 and 45 are rotatably connected via the connection pin 19a is provided in the side surfaces 15d and 15e in the curved part 15c of the boom 15. FIG. By providing the first and second pin coupling portions 17 and 19 on the boom 15 as described above, the boom 15 moves up and down (raising and lowering) around the boom foot pin 17a as the boom cylinders 45 and 45 expand and contract. ).

  On the other hand, on the upper surface 15d in the vicinity of the bending portion 15c of the boom 15 (the tip side from the bending portion 15c), a third pin coupling portion 21 to which the arm cylinder 55 is rotatably connected via the connection pin 21a is provided. It has been. Further, the boom 25 is pivoted via the connecting pin 23a to the tip 15a of the boom 15, in other words, to the boom side plates 15g, 15g formed on the tip 15a of the boom 15 so as to sandwich the arm 25 from the left and right. The 4th pin coupling | bond part 23 connected so that it is possible is provided. The rear end portion of the arm 25 is rotatably connected to a connecting portion 55a (a tip portion of the cylinder rod 55b) of the arm cylinder 55. The arm 25 is connected as the arm cylinder 55 expands and contracts. It rotates about the pin 23a.

  The bucket 35 has a base end portion pivotably connected to the arm 25 via a connecting pin 65a and a tip end portion rotatably connected to an idler link 69 via a connecting pin 69b. Along with the expansion and contraction of 65, the arm 25 rotates about the tip. The pin coupling portion referred to in the present invention corresponds to the first pin coupling portion 17, the second pin coupling portion 19, and the third pin coupling portion 21.

  By the way, in the first to third pin coupling portions 17, 19, and 21, the boom 15 is raised and lowered and the boom cylinders 45 and 45 and the arm cylinder 55 are rotated repeatedly. Malfunctions caused by friction between the hole walls of the through holes (not shown) formed in the coupling parts 17, 19, 21 and the connecting pins 17a, 19a, 21a, the hole walls of the through holes and the connecting pins 17a, 19a, In order to suppress wear of 21a, it is necessary to periodically supply (grease) grease to the first to third pin coupling portions 17, 19, and 21.

  For this reason, conventionally, a boom provided with a plurality of pin coupling portions has been provided with a greasing pipe for manually supplying grease to these pin coupling portions as shown in FIGS. . That is, the first and second greasing pipes 127 and 137 for supplying grease to the pin coupling portion 117 of the boom base end portion 115b are respectively provided with the grease feeding ports 127b and 137b provided at one end portion. Are connected to the right side and the left side of the boom 115, and both extend along the upper surface 115d of the boom 115 to the front end side in the boom longitudinal direction.

  In addition, the third and fifth greasing pipes 147 and 167 for supplying grease to the pin coupling portion 119 to which the left and right boom cylinders 145 and 145 are coupled have the greasing ports 147b and 167b provided at one end. A fourth greasing pipe 157 that is connected to the left and right sides of the pin coupling portion 119 and feeds the pin coupling portion 121 at the base end portion of the arm cylinder 155 is provided with a greasing port 157b provided at one end portion. Are connected to the pin coupling portion 121, and both are arranged along the upper surface 115 d of the boom 115 so as to extend toward the base end side in the boom longitudinal direction.

  The first to fifth greasing pipes 127, 137,... Arranged so as to extend on the upper surface 115d of the boom 115 in the boom longitudinal direction are positions near the base end portions of the boom cylinders 145, 145 in the boom longitudinal direction. It bends approximately 90 degrees to the right and extends to the right edge of the boom 115. And the greasing port 127a, 137a, 147a, 157a, 167a which consists of a cap provided at the other end of the first to fifth greasing tubes 127, 137,... (To each greasing tube 127, 137,. The supply ports for supplying grease from the boom 115 are bound by a fixing block provided at the right side edge of the boom 115 and are concentratedly arranged so as to be arranged at equal intervals in the boom longitudinal direction. In addition, straight grease nipples 127c, 137c, 147c, 157c, and 167c are attached to these greasing ports 127a, 137a,... It is designed to lubricate.

  As described above, in the conventional greasing pipe piping structure shown in FIGS. 6 and 7, the greasing ports 127a, 137a,... Of the first to fifth greasing pipes 127, 137,. Since it is centrally arranged in the part 115b, the operator P does not need to sequentially move between the pin coupling parts 117, 119, and 121, which are the parts to be lubricated, and can perform efficient greasing work. .

  However, in the piping structure of the conventional greasing pipe of construction machinery, the arrangement position of the greasing ports 127a, 137a,... Is the position (height) corresponding to the A position shown in FIG. There is a problem that it is difficult to supply grease from the outside to the greasing ports 127a, 137a, ... while standing on the ground.

  Therefore, in the piping structure of the greasing pipe of the construction machine according to the present embodiment, the greasing ports 27a, 37a,... Of the greasing pipes 27, 37, ... are not the upper surface 15d of the base end portion 15b of the boom 15, but the boom. By concentrating on the tip 15a of the boom 15 that can freely adjust the height from the ground by raising and lowering the 15, the grease is applied to the greasing ports 27a, 37a,. To be able to supply.

  As shown in FIGS. 3 and 4, the boom 15 is made of a thin metal tube or the like and has flexibility 5 for supplying grease to the first to third pin coupling portions 17, 19, 21. The greasing pipes 27, 37, 47, 57, 67 of the book are arranged. More specifically, the boom 15 includes first and second grease pipes 27 and 37 for supplying grease to the first pin coupling portion 17 provided at the base end portion 15b, a boom cylinder 45, In order to supply grease to the 3rd and 5th greasing pipes 47 and 67 for supplying grease to the 2nd pin coupling part 19 to which 45 is connected, and the 3rd pin coupling part 21 to which arm cylinder 55 is connected. The fourth greasing pipe 57 is extended in the boom longitudinal direction.

  In the first greasing pipe 27, a first base end greasing port (first greasing port) 27 b provided at one end is connected to an upper right end portion of the first pin coupling portion 17. The first greasing pipe 27 extends from the connecting portion to the upper surface 15d of the boom 15 diagonally to the left, and then, along the upper surface 15d of the boom 15, a central portion thereof (in plan view) straight in the boom longitudinal direction. It extends to the tip side.

  The second greasing pipe 37 has a second base end greasing port (first greasing port) 37 b provided at one end thereof connected to the left upper end of the first pin coupling portion 17. The second greasing pipe 37 extends from the connection location to the upper surface 15d of the boom 15 diagonally forward and then joins the first greasing pipe 27 at the center of the upper surface 15d of the boom 15, Along with the oil pipe 27, it extends straight (in plan view) to the front end side in the boom longitudinal direction so as to dive under various hydraulic pipes 31, 31,... Arranged on the upper surface 15d of the boom 15.

  As described above, the first and second greasing pipes 27 and 37 for supplying grease to the first pin coupling portion 17 located on the boom base end side with respect to the boom cylinders 45 and 45 are arranged on the upper surface 15 d of the boom 15. Thus, when the boom 15 is raised and lowered, even when the boom cylinders 45, 45 are rotated relative to the boom 15 on the left and right sides of the boom 15, the first and second greasing pipes are provided. 27 and 37 and the boom cylinders 45 and 45 do not interfere with each other.

  In the third greasing pipe 47, a third base end greasing port (first greasing port) 47 b provided at one end is connected to the upper left end of the second pin coupling portion 19. The third greasing pipe 47 is curved so as to swell upward and rearward from the connection portion, and then extends to the distal end side in the boom longitudinal direction along the left side edge portion of the upper surface 15d of the boom 15.

  The fourth greasing pipe 57 has a fourth base-side greasing port (first greasing port) 57 b provided at one end connected to the rear end of the third pin coupling portion 21. The fourth greasing pipe 57 is curved so as to swell rearward from the connection location, and then extends to the front end side in the boom longitudinal direction so as to merge with the first and second greasing pipes 27 and 37. 27 and the second greasing pipe 37 extend straight to the front end side in the boom longitudinal direction.

  The fifth greasing pipe 67 has a fifth base-side greasing port (first greasing port) 67b provided at one end connected to the upper end on the right side of the second pin coupling portion 19, and the connection After bending so as to swell upward and backward from the location, the first, second and fourth greasing pipes 27, 37, 57 are placed on the upper surface 15 d of the boom 15 so as to be sandwiched from the left and right sides together with the third greasing pipe 47. It extends to the front end side in the boom longitudinal direction along the right side edge.

  The first, second and fourth greasing pipes 27, 37, 57, the third greasing pipe 47, and the fifth greasing pipe 67 fall on the upper surface 15 d of the boom 15 and are in a contracted state. The boom 55 is joined to the left side 15e from the upper surface 15d of the boom without being bent suddenly at a position closer to the base of the boom than the connecting portion 55a of the arm 25 and the arm 25 while being bent obliquely to the left at a slant angle. 15 extends to the front of the fourth pin coupling portion 23 (near the tip of the boom) along the left side surface 15e. In other words, the first to fifth grease supply pipes 27, 37,... Fall on the boom tip side of the connecting portion 55 a between the arm cylinder 55 and the arm 25 in a state where the first and fifth grease supply pipes 27, 37, and the upper surface 15 d of the boom 15 are contracted. 15 is extended in the boom longitudinal direction along the left side surface 15e.

  As described above, the first to fifth greasing pipes 27, 37,... Are collapsed to the upper surface 15 d of the boom 15 and are closer to the boom tip than the boom 15 from the connecting portion between the arm cylinder 55 and the arm 25. By arranging the boom 15 on the left side surface 15e, the arm cylinder 55 can be easily lubricated without being obstructed. Further, since the first to fifth greasing pipes 27, 37,... Can be guided from the boom upper surface 15d to the left side surface 15e without being sharply bent, it is possible to suppress a significant increase in greasing resistance.

  As shown in FIG. 5, the left boom side plate 15 g formed at the distal end portion 15 a of the boom 15 has a fixed block in which five through holes arranged in the vertical direction are formed on the proximal end side of the fourth pin coupling portion 23. 29 is provided. And the front end side greasing ports 27a, 37a,... Made of the caps of the first to fifth greasing pipes 27, 37,. These are arranged in a concentrated manner so as to be arranged at equal intervals in the vertical direction. More specifically, the tip-side greasing ports 27a, 37a,... Of the first to fifth greasing tubes 27, 37,... Are concentrated at the tip portion 15a of the boom 15, and the third greasing tube from above. Tip greasing port 47a, tip greasing port 27a of the first greasing tube, tip greasing port 57a of the fourth greasing tube, tip greasing port 37a of the second greasing tube, fifth feeding It is being fixed to the fixed block 29 in order of the front end side greasing port 67a of a fat pipe. Each of the tip-side greasing ports 27a, 37a,... Is inserted into a hole formed in the fixed block 29, and is fixed to the fixed block 29 with a nut that is screwed into each of the tip-side greasing ports 27a, 37a,. Is fixed to the fixed block 29 by tightening so as to be sandwiched from the proximal end side and the distal end side. Further, 90-degree bent grease nipples 27c, 37c, 47c, 57c, 67c are attached to the respective front end-side greasing ports 27a, 37a,..., And these grease nipples 27c, 37c,. Is open toward the left in the direction perpendicular to the boom length.

  As described above, the tip-side greasing ports 27a, 37a,... Of the first to fifth greasing pipes 27, 37,. Even if the worker P does not move sequentially between 21, the grease is supplied to the pin coupling portions 17, 19, 21 via the first to fifth grease supply tubes 27, 37,.

-Lubrication procedure-
As described above, the first to third pin coupling portions 17, 19,... Are arranged via the first to fifth grease supply tubes 27, 37,... Disposed along the upper surface 15d and the left side surface 15e of the boom 15. When supplying grease to 21, first, the worker P stands in front of the excavator 1 and notifies the driver that the greasing operation is performed with a signal or the like. Then, according to the signal of the worker P, the bucket 35 and the arm 25 are folded to the shovel body 3 side so that the boom 15 of the hydraulic excavator 1 is turned down. As a result, the heights of the tip-side greasing ports 27a, 37a,... Of the first to fifth greasing pipes 27, 37,.

  Next, the worker P approaches the tip 15a of the boom 15 and installs a hand grease gun, a hand grease pump, etc. (not shown) perpendicularly to the left side surface 15e of the boom 15 from the left side of the boom 15 to each grease nipple 27c, 37c, Are pressed against the greasing ports and manually fed into the first to fifth greasing pipes 27, 37,... Via the respective grease nipples 27c, 37c,. Then, the grease is supplied to the first to third pin coupling portions 17, 19, 21 through the base end-side greasing ports 27 b, 37 b,..., For example, with the boom foot pin 17 a of the first pin coupling portion 17. A gap between the first pin coupling portion 17 and the through hole formed in the first pin coupling portion 17 is maintained in a lubricated state.

  In addition, the connecting pin 23a between the arm 25 and the boom 15, the connecting pin 55a on the rod side of the arm cylinder 55, and the connecting pin 65a on the head side of the bucket cylinder 65 are the first to fifth greasing pipes 27, 37,. Are close to the distal end portion 15a of the boom 15 where the distal end-side greasing ports 27a, 37a,... Are arranged, so that the operator P does not move greatly but also lubricates these pin coupling portions. Can do.

  Further, in the state where the bucket 35 and the arm 25 are folded to the shovel body 3 side and the boom 15 of the hydraulic excavator 1 is lowered, the connecting pin 35a between the arm 25 and the bucket 35 and the connecting pins 69a and 69b of the idler link 69 are provided. Since the connecting pin 71b between the bucket 35 and the arm 25 is also close to the tip 15a of the boom 15, the operator P does not move greatly around the excavator 1 and also supplies these pin coupling portions. Can be greasy.

-Effect-
According to this embodiment, since the front end side greasing ports 27a, 37a,... Of the first to fifth greasing pipes 27, 37,... Are concentrated on the front end portion 15a of the boom 15, the operator P No need to sequentially move between the pin coupling portions 17, 19, and 21 that are the locations to be lubricated, and smooth and quick lubrication can be performed.

  Further, the distal end side greasing ports 27a, 37a,... Of the first to fifth greasing pipes 27, 37,... Are not the proximal end portion 15b of the boom 15 attached to the excavator body 3 of the hydraulic excavator 1, but the distal end portion 15a. Therefore, when the tip of the boom 15 is lowered (the boom 15 is laid down), the height of the tip-side greasing ports 27a, 37a,. The height is less than the height of P (the waist of worker P). Thereby, the worker P can perform a smoother and quicker greasing work while standing on the ground without using an auxiliary tool such as a stepladder.

  Further, by disposing the distal end-side greasing ports 27a, 37a,... Of the first to fifth greasing pipes 27, 37,. In the unlikely event that grease is scattered, the window glass of the cab 11 can be prevented from being stained with grease, and the visibility from the cab can be kept good.

  .. Are arranged on the left side surface 15e near the tip 15a of the boom 15, so that the arm cylinder 55 is obstructive. Therefore, it is possible to easily perform the greasing operation. Further, since the coupling pin 21a to be lubricated is located on the upper surface 15d of the boom 15, a part of the first to fifth greasing pipes 27, 37,... Is arranged on the boom upper surface 15d. The first to fifth greasing pipes 27, 37,... Can be led from the boom upper surface 15d to the left side surface 15e without being bent sharply, so that the greasing resistance is not significantly increased.

  Further, since the connecting pins 23a, 55a, 65a,... To be lubricated for the arm 25 and the bucket 35 are close from the vicinity of the boom tip portion 15a, the greasing workability is improved.

  Further, by arranging the tip side greasing ports 27a, 37a,... Made of the caps of the first to fifth greasing pipes 27, 37,... The greasing resistance can be reduced by suppressing the above.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the embodiment described above, the piping structure of the greasing pipe of the construction machine according to the present invention is applied to the hydraulic excavator 1, but not limited to this, the arm 25 is rotatably connected to the distal end portion, while the proximal end portion May be applied to other construction machines as long as it has a boom 15 that is attached to the construction machine main body so that it can be raised and lowered.

Furthermore, in the said embodiment, although the piping structure of the greasing pipe | tube of the construction machine which concerns on this invention was applied to the hydraulic excavator 1 whose bucket capacity | capacitance is 0.5 m ³ class, it is not restricted to this but a bucket capacity | capacitance is 0.5 m. Applicable to hydraulic excavators smaller than class ³ (for example, bucket capacity 0.45m class ³ ) and hydraulic excavators with bucket capacity larger than 0.5m class ³ (for example, bucket capacity 0.7m class ³ ) May be.

  Moreover, in the said embodiment, although the greasing port of the greasing pipe was concentrated and arrange | positioned at the left side 15e in the front-end | tip part 15a of the boom 15, it is not restricted to this, The front end side greasing of the greasing pipe is carried out to the right side 15f. The mouths 27a, 37a,... May be centrally arranged.

  Furthermore, in the above-described embodiment, at least on the boom tip side of the connecting portion 55a between the arm cylinder 55 and the arm 25 in a state where the arm cylinder 55 and the arm 25 are collapsed on the upper surface 15d of the boom 15, the left side surface of the boom 15 is aligned. Although the 1st-5th greasing pipes 27, 37,... Are extended, the present invention is not limited to this, and the boom proximal end side of the connecting portion 55a (for example, at the joint portion between the boom cylinders 45, 45 and the boom 15) The first to fifth greasing pipes 27, 37,... May extend along the left side surface 15 e of the boom 15.

  Moreover, in the said embodiment, the 1st pin coupling | bond part 17 of the base end part 15b of the boom 15, the 2nd pin coupling | bond part 19 to which boom cylinders 45 and 45 are connected, and the 3rd pin to which the arm cylinder 55 is connected. Although five grease supply pipes are arranged in the coupling portion 21 so that grease can be supplied, the present invention is not limited to this, and a grease supply pipe capable of supplying grease to other pin coupling portions provided in the boom 15 is also provided. It may be provided.

  Furthermore, in the said embodiment, although the bucket 35 was attached to the front-end | tip part of the arm 25, you may make it attach not only to this but the hydraulic crusher to the front-end | tip part of the arm 25, for example.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for a piping structure of a greasing pipe of a construction machine for manually supplying grease to a pin coupling portion provided on a boom that is attached to a main body of the construction machine so as to be raised and lowered. is there.

1 is a side view of a hydraulic excavator according to the present invention. It is a side view of a boom. It is a top view of the boom front end side. It is a top view of the boom base end side. It is a partial detail drawing of a boom front-end | tip part. It is a top view by the side of the boom base end which shows the piping structure of the conventional greasing pipe. It is a side view of the boom base end side which shows the piping structure of the conventional grease supply pipe | tube.

1 Excavator (construction machine)
3 Excavator body (construction machine body)
15 Boom 15a Tip 15d Upper surface 15e Left side (one side)
17 First pin coupling part (pin coupling part)
19 Second pin coupling part (pin coupling part)
21 3rd pin coupling part (pin coupling part)
25 Arm 27 1st greasing pipe (greasing pipe)
27a Tip side greasing port (second greasing port)
27b Base end side greasing port (first greasing port)
37 Second greasing pipe (greasing pipe)
37a Tip side greasing port (second greasing port)
37b Base end side greasing port (first greasing port)
47 3rd greasing pipe (greasing pipe)
47a Tip side greasing port (second greasing port)
47b Base end side greasing port (first greasing port)
55a Connection part 57 4th greasing pipe (greasing pipe)
57a Tip side greasing port (second greasing port)
57b Base end side greasing port (first greasing port)
67 5th greasing pipe (greasing pipe)
67a Tip side greasing port (second greasing port)
67b Base end side greasing port (first greasing port)

Claims (3)

Piping structure of a greasing pipe for a construction machine, in which a plurality of grease pipes for supplying grease to a plurality of pin coupling portions provided on a boom of the construction machine are extended in the boom longitudinal direction along the boom Because
The boom is pivotally connected to the main body of the construction machine, while the base end is attached to the main body of the construction machine, while the arm is rotatably connected to the tip.
The plurality of greasing pipes are respectively connected to the plurality of pin coupling portions corresponding to the first greasing ports provided at one end, while the second greasing ports provided at the other end are the above A piping structure for a greasing pipe of a construction machine, characterized by being concentrated at the tip of the boom. In the piping structure of the greasing pipe of the construction machine according to claim 1,
The second greasing port of the plurality of greasing pipes is arranged on one side surface in the vicinity of the tip of the boom. In the piping structure of the greasing pipe of the construction machine according to claim 2,
A piping structure for a greasing pipe for a construction machine, wherein the second greasing ports of the plurality of greasing pipes are arranged so as to open toward the distal end side in the boom longitudinal direction.

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