JP5560568B2 - Work machine - Google Patents

Description

  The present invention relates to a working machine such as a hydraulic excavator, and more particularly to a piping structure around a hydraulic pump.

  Regarding the present invention, an engine in which a hydraulic pump is attached to each of the front and rear surfaces of a driving force transmission unit is disclosed (Patent Document 1). Flange is provided around the suction port of each hydraulic pump, and the flange of the manifold is connected to these flanges.

  However, in such an engine, when the hydraulic pump is attached to the driving force transmission portion, the attachment position may be relatively twisted to cause a positional shift, and if the manifold is attached as it is, the manifold is twisted to cause cracks or the like. There is a fear. Therefore, in order to absorb the twist even if the manifold is twisted, the manifold is formed of a synthetic resin material or a metal casting having elasticity, or the manifold of a normal metal casting is divided into two front and rear parts, It is considered to connect the manifold with a rotatable fitting portion.

JP-A-8-296783

  In a conventional work machine, piping installed between the hydraulic oil tank and the hydraulic pump occupies a relatively large space in the machine room, which is an obstacle to realizing downsizing of the work machine.

  For example, as shown in FIG. 4, normally, in the machine room 106 of the conventional work machine, the hydraulic oil tank 107 is located on the front side, and the hydraulic pump 108 is located on the rear side. An oil feed pipe 109 connected to the hydraulic oil tank 107 extends in the front-rear direction so as to cover the bottom surface of the machine chamber 106 and extends to a position below the hydraulic pump 108. In the figure, reference numeral 101 is a lower traveling body, 102 is an upper turning body, 103 is a cab, 104 is an attachment, and 105 is an engine.

  When a plurality of hydraulic pumps 108 are provided, for example, a piping structure as shown in FIG. That is, the port pipes 110a and 110b extend downward from the hydraulic pumps 108a and 108b, and the end portions of the oil supply pipes 109 extending in parallel with the hydraulic pumps 108a and 108b face the port pipes 110a and 110b upward. A pair of protruding branch pipes 111a and 111b are provided. The port pipes 110a and 110b and the branch pipes 111a and 111b are connected by hoses 112a and 112b extending in the vertical direction.

  By combining the pipe and the hose in this way, the influence of the displacement of the hydraulic pumps 108a and 108b can be eliminated at the time of installation, and the vibration of the hydraulic pumps 108a and 108b can be absorbed at the time of use. .

  However, the diameters of the oil feeding pipe 109 and the like and the hoses 112a and 112b are larger than those of general pipes and hoses, and in order to make use of the flexibility of the hoses 112a and 112b, these lengths are secured to some extent. It is necessary to keep. For this reason, a relatively large space must be provided below the hydraulic pumps 108a and 108b so that the assembled hoses and pipes can be accommodated, and the arrangement of the hydraulic pumps 108a and 108b and the arrangement of the engine 105 connected thereto are limited. This has been an obstacle to downsizing the machine room 106 and the work machine.

  Therefore, an object of the present invention is to provide a work machine having a piping structure that can be easily assembled, is compact, and has excellent vibration absorption.

  In order to achieve the above object, the present invention devised the arrangement of hoses and pipes constituting the piping.

Specifically, an engine, a first pump and a second pump driven by the engine, a hydraulic oil tank for storing hydraulic oil to be supplied to the first pump and the second pump, the first pump and the first pump A working machine comprising two pumps and an oil supply pipe connecting the hydraulic oil tank, wherein the first pump and the second pump are connected in series such that their drive axes overlap , The axis line is supported by the engine so as to overlap the drive axis line of the engine and extend in a substantially horizontal direction, and the oil feeding pipe includes a plurality of hard pipe parts, and a soft first hose part and a second hose part. And the pipe part is connected to the first pump and extends downward, the pipe part is connected to the second pump and extends downward, and the hydraulic oil tank Connection A third pipe portion extending in a substantially horizontal direction toward the first pump and the second pump, wherein the first pipe portion is formed shorter than the second pipe portion, and the second pipe portion is from its intermediate portion branches have a branch pipe portion protruding into the first pipe portion, the lower end portion of the first pipe section, said branch pipe via said first hose portion extending in a substantially horizontal direction And a lower end portion of the second pipe portion is connected to the third pipe portion via the second hose portion extending in a substantially horizontal direction.

  In the working machine having such a configuration, since the first pipe portion and the second pipe portion are connected by the soft first hose portion, the first pump and the second pump are slightly displaced at the time of connection. Even if it is, the influence of the position shift can be absorbed by the 1st hose part, and the 1st pipe part, the 2nd pipe part, etc. can be connected certainly by simple operation.

  Since the first pipe portion is formed shorter than the second pipe portion, the branch pipe portion and the first hose portion can be disposed along the first pump and the like, and a space can be secured below the first pipe portion. Furthermore, since the second pipe portion can be set as short as necessary, the installation position of the first pump, the second pump, and the engine can be lowered accordingly, and the machine room, and thus the work machine itself can be downsized. Is possible.

  Since the first hose portion and the second hose portion extend substantially in parallel with the first pump and the second pump connected in series, most vibrations of the first pump and the like are absorbed by the deformation in the radial direction. Therefore, the flexibility can be used efficiently and the vibration absorption is excellent.

  Further, the second hose part is located between the third pipe part and the second pipe part connected to the hydraulic oil tank, and the length thereof can be made relatively large. Can be reduced from being transmitted to the hydraulic oil tank, and the vibration absorption can be further improved.

  More specifically, it is preferable that the second pump side of the first pump and the second pump is supported by the engine.

  By doing so, vibration absorbability can be improved more. That is, when the engine vibrates, the first pump away from the engine tends to swing more greatly than the second pump. Therefore, when the second pump is located on the engine side, the amount of vibration that acts directly on the second hose portion is reduced, and transmission of vibration to the hydraulic oil tank can be further reduced.

  In particular, this is effective when a third pump is further connected to the tip side of the first pump and the second pump connected in series. This is because even if the vibration amount of each pump is further increased by the third pump, the vibration can be efficiently absorbed.

  As described above, according to the present invention, since the piping structure around the hydraulic pump can be made compact and excellent in vibration absorption, it is excellent in durability and useful for downsizing of work machines and the like. A machine can be provided.

It is a top view which shows the outline of the principal part of a hydraulic excavator (work machine). It is a rear side view which shows the outline of the principal part seen from the arrow X direction in FIG. It is a perspective view which shows the outline of the principal part seen from the arrow Y direction in FIG. It is a top view which shows the outline of the principal part of the conventional hydraulic shovel. It is a rear side view which shows the outline of the principal part seen from the arrow Z direction in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following description is only an illustration and does not restrict | limit this invention, its application thing, or its use.

  FIG. 1 illustrates a hydraulic excavator (work machine) to which the present invention is applied. This hydraulic excavator is provided with a crawler type lower traveling body 1 and an upper revolving body 2 that is mounted on the lower traveling body 1 so as to be able to swivel. The upper swing body 2 is provided with a cab 3, an attachment 4, a machine room 5, and the like. In the machine room 5, an engine 6, a hydraulic pump 7, a hydraulic oil tank 8, a control valve 9, and the like are provided. Has been. In the figure, the machine room cover and the like are removed so that the internal structure of the cab 3 and the machine room 5 can be understood.

  The cab 3 is disposed on the left side in front of the upper swing body 2, and a seat, an operation lever, various display devices, and the like are disposed therein. On the right side of the cab 3 (the central portion in front of the upper swing body 2), an attachment 4 composed of a boom, an arm, a bucket, and the like is disposed so as to be raised and lowered. A turning motor 10 that turns the upper swing body 2 is disposed behind the attachment 4 (substantially central portion of the upper swing body 2).

  The machine room 5 is disposed from the right side of the attachment 4 (the right side portion in front of the upper swing body 2) to the rear side of the cab 3 and the attachment 4 (the portion between the left and right sides behind the upper swing body 2). Has been. An engine 6 is disposed behind the machine room 5 such that the drive axis A1 extends in the left-right direction of the upper swing body 2. On the right side in the machine room 5, a fuel tank 14, a hydraulic oil tank 8, a control valve 9, and a hydraulic pump 7 are arranged in this order from the front end to the rear end.

  The hydraulic oil tank 8 and the hydraulic pump 7 are connected by an oil supply pipe 11, and the hydraulic pump 7 and the control valve 9 are connected by a pressure supply oil pipe 12. The control valve 9 and the hydraulic oil tank 8 are connected by a return pipe 13. The oil feeding pipe 11 will be described later separately.

  Fuel for driving the engine 6 is stored in the fuel tank 14, and hydraulic oil for hydraulic control of the attachment 4 and the like is stored in the hydraulic oil tank 8. The control valve 9 is provided with various control valves for controlling the hydraulic oil pressure.

  As shown in FIG. 2, a plurality of hydraulic pumps 7 are installed, and the hydraulic pump 7 of the present embodiment includes a first pump 71, a second pump 72, and a third pump 73. Both the first pump 71 and the second pump 72 are composed of pumps of the same type and performance, and are main pumps for hydraulic control. On the other hand, the third pump 73 is constituted by a small gear pump having a smaller capacity than the first pump 71 and the like. These hydraulic pumps 71, 72, 73 are connected in series so that their drive axes A2 overlap (the connected hydraulic pumps 71, 72, 73 are also referred to as pump trains). The pump row is supported in a cantilever manner by the engine 6 so as to extend in a substantially horizontal direction, and is connected to the engine 6 so that its drive axis A2 and the drive axis A1 of the engine 6 overlap each other. It is comprised so that it may be directly rotationally driven by. In the present embodiment, the second pump 72, the first pump 71, and the third pump 73 are connected in this order from the engine 6 side.

  When each hydraulic pump 71, 72, 73 is rotationally driven, the hydraulic oil is supplied from the hydraulic oil tank 8 to the hydraulic pumps 71, 72, 73 through the oil feed pipe 11. Pressurized hydraulic fluid discharged from the first pump 71 and the second pump 72 is supplied to the control valve 9 through the pressure supply oil pipes 12 and 12, and each device such as the attachment 4 is driven and controlled using the hydraulic pressure. Is done. The hydraulic oil supplied to the control valve 9 is finally returned to the hydraulic oil tank 8 through the return pipe 13.

  In this hydraulic excavator, the oil feeding pipe 11 is devised so as to fit in the machine room 5 in a compact manner. Specifically, the oil feeding pipe 11 includes a plurality of hard pipe portions 20 made of steel pipes, and a plurality of soft hose portions 30 made of a material having flexibility, pressure resistance, and oil resistance such as rubber and synthetic resin. It is comprised by connecting.

  2 and 3, the pipe portion 20 is connected to the first suction port 71 a of the first pump 71 and extends downward, and the second suction port 72 a of the second pump 72. Is connected to the hydraulic oil tank 8 and has one end connected to the hydraulic oil tank 8 and extending in a substantially horizontal direction so as to crawl the bottom surface of the machine room 5, and the other end below or below the hydraulic pump 7. It consists of a third pipe portion 23 and the like located in the vicinity thereof.

  The first pipe portion 21 is formed shorter than the second pipe portion 22, and an elbow member (general-purpose product) 21 a used for bending and connecting the pipe by 90 degrees is connected to the lower end portion of the first pipe portion 21. And a first connection portion 21b that protrudes in a substantially horizontal direction toward the second pipe portion 22 side. And the 2nd pipe part 22 is provided with the branch pipe part 24 branched from the intermediate part and protruding in the substantially horizontal direction so that this 1st connection part 21b may be opposed. A second connection portion 24 a is provided at the distal end portion of the branch pipe portion 24.

  At the lower end of the second pipe portion 22, a hose connection end 22 a that is bent approximately 90 degrees and protrudes in a substantially horizontal direction toward the front of the upper swing body 2 is provided. The hose connection end 22a may be formed using an elbow member in the same manner as the first pipe portion 21. The first pipe portion 21 and the branch pipe portion 24 are formed to have a slightly smaller diameter than the second pipe portion 22 and the third pipe portion 23.

  The hose portion 30 includes a first hose portion 31 and a second hose portion 32. The first hose portion 31 has an inner diameter that is equal to or slightly larger than the outer diameter of the first pipe portion 21 and the like, and the second hose portion 32 is equal to or smaller than the outer diameter of the third pipe portion 23 and the like. It has a slightly larger inner diameter. The second hose portion 32 is formed sufficiently longer than the first hose portion 31.

  The first hose portion 31 is inserted into the first connection portion 21b and the second connection portion 24a, and is tightened using a ring-shaped clamp member 15 (general-purpose product), so that the first hose portion 31 is arranged in the vicinity thereof along the pump row. It is installed.

  As shown in FIG. 3, the second hose portion 32 is connected to the third pipe portion 23 with one end inserted into the third pipe portion 23 using the clamp member 15 similarly to the first hose portion 31, and the other end is connected to the second pipe. The hose connection end 22a of the part 22 is inserted and connected. By doing so, the second hose portion 32 is disposed so as to extend in the substantially horizontal direction in the front-rear direction of the upper swing body 2 and to cover the bottom surface 5 a of the machine room 5. Reference numeral 5b denotes a reinforcing rib which stands on the bottom surface 5a of the machine room 5.

  Moreover, as shown in FIG.2 and FIG.3, the branch piping 25 for the 3rd pump 73 is protrudingly formed in the hose connection end 22a. The branch pipe 25 has a smaller diameter than the first pipe part 21 and the second pipe part 22, and is connected to the third pump 73 via the third hose part 33.

  By assembling the pipe part 20 and the hose part 30 in this way, the following advantages can be obtained.

  First, it is excellent in workability for assembling piping. Since the first pipe portion 21 and the second pipe portion 22 are connected by the soft first hose portion 31, the first pump 71 and the second pump 72 are slightly moved around the drive axis A2 when connected. Even if it is misaligned, the first hose portion 31 can absorb the influence of the misalignment, and the first pipe portion 21 and the second pipe portion 22 and the like can be connected easily and in a short time without applying extra load. it can.

  A space S can be secured below the hydraulic pump 7. As shown in FIGS. 2 and 3, the oil feeding pipe 11 (first hose portion 31 and the like) connected to the first pump 71 is connected to the oil feeding pipe 11 (second pipe portion 22) connected to the second pump 72. ), The space S can be secured below the first pump 71 portion.

  Further, unlike the conventional configuration shown in FIG. 5, since there is no restriction during installation to ensure the length of the hose, the length of the second pipe portion 22 can be freely set as required. Can be set. And if the 2nd pipe part 22 is set short, the installation position of a pump row | line | column and the engine 6 can be lowered | hung so much, Therefore It becomes possible to reduce the size of the machine room 5, and also the working machine itself.

  Vibration absorption can be improved. The pump train is supported in a cantilever manner by the engine 6 that is a vibration generation source, and extends in a substantially horizontal direction. Therefore, when the engine 6 vibrates, as shown in FIG. 2, the pump train vibrates around the drive axis A1 (A2) extending substantially in the horizontal direction. In particular, the amount of vibration is the tip side of the pump train, that is, the second pump. The first pump 71 and the third pump 73 tend to be larger than the first pump 71 than the first pump 71. Further, since the weight of the pump train acts, the vibration in the vertical direction is relatively likely to increase.

  On the other hand, first, by providing the first hose portion 31 between the first pump 71 and the second pump 72, the difference in vibration amount between the first pump 71 and the second pump 72 is reduced to the first hose. It can be absorbed by the part 31. Since the 1st hose part 31 and the 2nd hose part 32 are extended substantially parallel to the pump row | line | column, the vibration of the up-down direction of a pump row | line | column will be absorbed by the deformation | transformation of each hose part 31 and 32 in the radial direction. . Therefore, the flexibility of each hose part 31 and 32 can be used efficiently, and the vibration absorption is excellent.

  Further, by disposing the second pump 72 directly connected to the second hose part 32 closer to the engine 6, the amount of displacement acting on the second hose part 32 than disposing away from the engine 6. Therefore, the vibration of the pump train transmitted to the hydraulic oil tank 8 can be further reduced, and the vibration absorption is excellent.

  Further, since the second hose portion 32 is formed sufficiently long by utilizing the distance between the hydraulic oil tank 8 and the hydraulic pump 7, the vibration of the pump train is further transmitted to the hydraulic oil tank 8. Can be reduced.

  In particular, as the third pump 73 is disposed as in the present embodiment, the longer the pump row, the greater the amount of vibration due to the vibration of the engine 6, but the oil feed pipe 11 is thus configured. If this is done, vibrations can be absorbed effectively, so durability can be improved and troubles such as oil leakage can be prevented.

  The work machine according to the present invention is not limited to the above-described embodiment, and includes various other configurations. For example, in the above embodiment, the second pump 72 side is supported by the engine 6, but the first pump 71 side, that is, the pump side to which the oil feeding pipe 11 is branched and connected is supported by the engine 6. There may be. The third pump 73 may not be provided, and a fourth pump or the like may be connected to the third pump 73.

5 Machine room 6 Engine 7 Hydraulic pump 8 Hydraulic oil tank 11 Oil supply pipe 20 Pipe part 21 First pipe part 22 Second pipe part 23 Third pipe part 24 Branch pipe part 30 Hose part 31 First hose part 32 Second hose Part 71 first pump 72 second pump 73 third pump

Claims (3)

Engine,
A first pump and a second pump driven by the engine;
A hydraulic oil tank for storing hydraulic oil to be supplied to the first pump and the second pump;
An oil feed pipe connecting the first pump and the second pump and the hydraulic oil tank;
A work machine comprising:
The first pump and the second pump are connected in series so that their respective drive axes overlap, and are supported by the engine such that these drive axes overlap the drive axis of the engine and extend in a substantially horizontal direction. ,
The oil feeding pipe has a plurality of hard pipe parts, and a soft first hose part and a second hose part,
The pipe part is
A first pipe connected to the first pump and extending downward;
A second pipe connected to the second pump and extending downward;
A third pipe connected to the hydraulic oil tank and extending in a substantially horizontal direction toward the first pump and the second pump;
Including
The first pipe part is formed shorter than the second pipe part,
The second pipe portion has a branch pipe portion that branches from the intermediate portion and protrudes toward the first pipe portion,
A lower end portion of the first pipe portion is connected to the branch pipe portion via the first hose portion extending in a substantially horizontal direction;
A lower end portion of the second pipe portion is connected to the third pipe portion via the second hose portion extending in a substantially horizontal direction ;
A work machine in which the branch pipe portion and the first hose portion are disposed along a lower part of a pump row including the first pump and the second pump . The work machine according to claim 1,
A work machine in which the second pump side of the first pump and the second pump is supported by the engine. In the work machine according to claim 1 or 2,
A work machine in which a third pump is further connected to tip ends of the first pump and the second pump connected in series.

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