Working machinery

Abstract

To provide a work machine that enables improved lifting capacity of the work machine without extending the length of the upper rotating body in the front-rear direction to the rear. [Solution] The excavation work machine 1 is a work machine comprising a lower traveling body, an upper rotating body supported by the lower traveling body, and an excavation device provided at the front of the upper rotating body, wherein the upper rotating body comprises a rotating frame 7 having a bottom plate 71 and being rotatably connected to the lower traveling body, an engine 12 positioned behind the rotation center C of the rotating frame 7 on the bottom plate 71, an oil pan 45 positioned between the bottom plate 71 and the engine 12 in the vertical direction, and a weight 41 positioned between the oil pan 45 on the bottom plate 71 and the rotation center C in the front-rear direction with the left-right direction extending.

Description

Technical Field

[0001] The present invention relates to a working machine equipped with a counterweight.

Background Art

[0002] Conventionally, for example, a working machine such as an excavation working machine is composed of a lower traveling body, an upper revolving body rotatably supported by the lower traveling body, and a working machine attached to the front part of the upper revolving body. And a counterweight, which is a counterweight for taking the weight balance with the working machine, is provided at the rear edge of the upper revolving body (see, for example, Patent Document 1).

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the working machine disclosed in Patent Document 1, in a configuration where a counterweight is provided at the rear edge of the upper revolving body, an additional counterweight is attached to the counterweight as a standard equipment. In a working machine that adjusts the weight balance with the working machine only by the counterweight, the counterweight becomes large depending on the lifting performance to be realized on the working machine side. Then, the rear edge of the upper revolving body will protrude further backward. That is, when the upper revolving body rotates, the rear end of the upper revolving body protrudes greatly from the full width of the traveling part (the width between the left and right ends of the pair of left and right crawlers). For this reason, for example, in a working machine called an ultra-small turning type, it may be difficult to make the upper revolving body including the working machine fully rotate within 120% of the full width of the traveling part.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a working machine that can improve the lifting ability of the working machine without extending the length of the upper revolving body in the front-rear direction backward.

Means for Solving the Problems

[0006] The present invention relates to a work machine comprising a lower traveling body, an upper rotating body supported by the lower traveling body, and a work machine supported by the upper rotating body, wherein the upper rotating body has a bottom plate and comprises a rotating frame rotatably supported by the lower traveling body, an engine positioned behind the pivot center of the rotating frame on the bottom plate, an oil pan positioned vertically between the bottom plate and the engine, and a counterweight extending horizontally between the oil pan on the bottom plate and the pivot center.

[0007] In another aspect of the present invention, the working machine is characterized in that the counterweight is positioned below the engine.

[0008] In another aspect of the present invention, the work machine is provided with left and right vertical plates extending in the front-rear direction on the bottom plate, and the weight is positioned between the left and right vertical plates.

[0009] In another aspect of the present invention, the working machine is formed such that the weight is directly or indirectly integrated with the left and right vertical plates.

[0010] In another aspect of the present invention, the working machine is such that the engine is supported by the weight via a front support member that supports the front side of the engine.

[0011] In another aspect of the present invention, a work machine is provided in which a horizontal plate is arranged on the bottom plate, connecting the left and right vertical plates behind the engine, and the engine is supported on the horizontal plate via a rear support member that supports the rear side of the engine.

[0012] Another aspect of the present invention relates to a work machine in which, at the front of the bottom plate, another vertical plate is provided between the left and right vertical plates, parallel to one of the left and right vertical plates, and the base end of the work machine is supported between one of the left and right vertical plates and the other vertical plate.

[0013] In another aspect of the present invention, a work machine is provided on the rear side of the bottom plate so as to straddle the engine, and the lower end of the rear frame is connected to the bottom plate via the weight and / or the cross plate. [Effects of the Invention]

[0014] According to the present invention, by providing a weight on the bottom plate of the slewing frame, it is possible to improve the lifting capacity of the work machine without extending the length of the upper slewing body in the front-rear direction to the rear. [Brief explanation of the drawing]

[0015] [Figure 1] This is a left side view of an excavation machine according to one embodiment of the present invention. [Figure 2] This is a plan view of an excavation machine according to one embodiment of the present invention. [Figure 3] This is a side view of the slewing frame of an excavation machine according to one embodiment of the present invention. [Figure 4] This is a plan view of the slewing frame of an excavation machine according to one embodiment of the present invention. [Figure 5] This is a perspective view of the slewing frame of an excavation machine according to one embodiment of the present invention. [Figure 6] This is a perspective view of the slewing frame of an excavation machine according to one embodiment of the present invention. [Modes for carrying out the invention]

[0016] In a configuration with a counterweight, by devising the arrangement of the counterweight, the lifting performance of the working machine is improved without extending the length in the front-rear direction of the upper revolving body backward. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] In an embodiment of the present invention, as a working machine according to the present invention, an excavation working machine (excavator) which is a swing working vehicle will be described as an example. However, the working machine according to the present invention is not limited to an excavation working machine, and can be widely applied to other working machines such as a crane working machine.

[0018] The configuration of the excavation working machine 1 according to the present embodiment will be described with reference to the drawings. Hereinafter, unless otherwise specified, based on the position of the operator sitting in the driver's seat of the excavation working machine 1, it is referred to as "front side", "rear side", "left and right sides", "plane side" or "upper side", "bottom side" or "lower side".

[0019] FIG. 1 is a left side view of the excavation working machine 1 according to the present invention, and FIG. 2 is a plan view thereof. As shown in FIGS. 1 and 2, the excavation working machine 1 is a so-called ultra-small swing type excavator, and includes a self-propelled traveling vehicle body 2, an excavation device 3 and a soil discharging device 4 as working devices attached to the traveling vehicle body 2. The traveling vehicle body 2 is composed of a lower traveling body 2A having a traveling part 5 and an upper revolving body 2B provided rotatably on the upper part of the lower traveling body 2A. The soil discharging device 4 is attached to the lower traveling body 2A side, and the excavation device 3 is attached to the upper revolving body 2B side.

[0020] The lower traveling body 2A has a pair of left and right crawler-type traveling parts 5, 5 and a machine body frame 6 as a base provided between the left and right traveling parts 5, 5.

[0021] The traveling part 5 has a configuration in which a crawler is wound around a sprocket, an idler and a plurality of rollers supported by the machine body frame 6. The traveling part 5 has a drive sprocket 5a which is a drive wheel at its rear end.

[0022] On the front side of the machine body frame 6, a soil discharging device 4 is attached. The soil discharging device 4 is provided so as to be vertically rotatable with respect to the lower traveling body 2A. The soil discharging device 4 includes a pair of left and right arms 4a and a blade 4b which is a soil discharging plate provided at the tips of the pair of left and right arms 4a. The soil discharging device 4 including these components is configured to be substantially symmetrical about the left and right.

[0023] The left and right arms 4a are provided so as to extend in the front-rear direction between the left and right traveling parts 5, 5. The left and right arms 4a are supported with the left-right direction as the rotation axis direction with respect to an arm support bracket provided at the front part of the machine body frame 6 at their base ends. And the left and right arms 4a are vertically rotated by the expansion and contraction of a blade cylinder 25 arranged between the left and right arms 4a.

[0024] The upper swing body 2B has a swing frame 7 mounted so as to be swingable with respect to the traveling part 5. The swing frame 7 is connected to the machine body frame 6 via a swing bearing 8, and is provided so as to be swingable in either the left or right direction about a swing axis with the vertical direction as the axis direction with respect to the machine body frame 6 by the drive of a swing motor (not shown).

[0025] The swing frame 7 is a support structure that supports each component arranged on the upper swing body 2B. A cabin 10 is installed on the swing frame 7. Also, on the swing frame 7, on the right side and the rear side of the cabin 10, an engine room 9 for housing the engine 12 which is a drive source and various devices is provided. The engine room 9 is formed by covering the rear part and the right side part of the swing frame 7 with a bonnet and an exterior cover.

[0026] The engine room 9 includes a right engine room 9a located on the right side of the swing frame 7 and a rear engine room 9b located at the rear. In the right engine room 9a, a fuel tank for the engine, a hydraulic actuator working oil tank, and various peripheral devices are housed. Also, the engine 12 is arranged in the rear engine room 9b.

[0027] Engine 12 is a diesel engine that includes a combustion chamber. Directly below engine 12 is an oil pan 45 (see Figure 3) that stores lubricating oil. The lubricating oil in the oil pan 45 is supplied to each lubrication part of engine 12 by the operation of a lubricating oil pump (not shown), and then returned to the oil pan 45.

[0028] Furthermore, a counterweight 7a is provided at the rear end of the slewing frame 7. The counterweight 7a is for balancing the weight with the drilling device 3. The counterweight 7a is formed in a roughly arc shape in plan view, with the center of its rear surface protruding rearward, and is attached to the slewing frame 7 so as to cover the lower rear side of the engine room 9.

[0029] The cabin 10 has a roughly box-like shape. The cabin 10 consists of a roof section 11a and a cabin frame 11b that supports the roof section 11a. A door 14, which serves as an entrance and exit for the operator, is provided on the left side of the cabin 10. The rear end of the cabin frame 11b is connected to the upper plate section 86 (see Figure 6) of the rear frame 83 of the slewing frame 7, which will be described later.

[0030] The cabin 10 is equipped with a driver's seat 15 where the operator sits, and operating devices for operating the drilling machine 3 and the travel unit 5. In other words, the cabin 10 contains an operating unit including the driver's seat 15 and the operating devices. The operating devices also include an operating panel section with various operating parts such as work operation levers and switches for operating the drilling machine 3, etc., and these are arranged around the driver's seat 15.

[0031] A boom support section 39 (see Figure 4) is provided on the front side of the slewing frame 7, between the right engine room 9a and the cabin 10, which rotatably supports the base of the excavation device 3.

[0032] The boom support section 39 includes a right vertical plate 19 positioned to the right of the center in the left-right direction of the slewing frame 7, a pivot shaft 39a mounted between the right vertical plate 19 and the intermediate vertical plate 13 positioned near the center in the left-right direction of the slewing frame 7, and a cylinder bracket 38. The pivot shaft 39a pivotally supports the base of the boom 21, which will be described later. The cylinder bracket 38 has a configuration in which a support shaft 38c parallel to the pivot shaft 39a is mounted on a pair of left and right support plates 38a and 38b that protrude upward from the slewing frame 7. The cylinder bracket 38 rotatably supports the cylinder-side end of the boom cylinder 26, which will be described later.

[0033] The drilling device 3 comprises a boom 21 that forms the base portion of the drilling device 3, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The boom 21 is composed of a first boom 21a, a second boom 21b, and a third boom 21c.

[0034] The first boom 21a has a shape in which its tip is bent forward at an obtuse angle when viewed from the side. A bracket portion 34 is formed at the tip of the first boom 21a, connecting the base end of the second boom 21b, the base end of the offset link 24, and one end of the offset cylinder 27. The base end of the first boom 21a is supported by a boom support portion 39 provided on the slewing frame 7. More specifically, the base end of the first boom 21a is pivotally supported on a pivot shaft 39a (see Figures 1 and 4) whose axial direction is in the left-right direction, thereby supporting the boom 21 so that it can swing up and down relative to the slewing frame 7.

[0035] The second boom 21b is supported at its base so as to be able to swing from side to side at the tip of the first boom 21a.

[0036] The third boom 21c has a roughly triangular shape in side view and is supported at the tip of the second boom 21b so as to be able to swing from side to side. The first boom 21a and the third boom 21c are connected to each other by an offset link 24 provided parallel to the second boom 21b. The first boom 21a, the second boom 21b, the third boom 21c and the offset link 24 are connected to each other to form a parallelogram linkage mechanism.

[0037] The excavation device 3 includes a boom cylinder 26 for rotating the first boom 21a, an offset cylinder 27 for rotating the second boom 21b and the offset link 24, an arm cylinder 28 for rotating the arm 22, and a work tool cylinder 29 for rotating the bucket 23. All of these cylinders are hydraulic cylinders. Depending on the work to be done, other devices such as a grapple or breaker may be attached to the excavation device 3 instead of the bucket 23.

[0038] The boom cylinder 26 is positioned in front of the first boom 21a and along the length of the first boom 21a. The base end of the boom cylinder 26 is rotatably supported on the support shaft 38c. As the boom cylinder 26 extends and retracts, the first boom 21a swings around the pivot shaft 39a.

[0039] The offset cylinder 27 is positioned along the length of the left side of the second boom 21b. The rod end of the offset cylinder 27 is rotatably connected to the left side of the third boom 21c via a bracket. The cylinder end of the offset cylinder 27 is rotatably connected to a bracket portion 34 protruding from the left side of the base end of the second boom 21b. As the offset cylinder 27 extends and retracts, the second boom 21b and the offset link 24 swing from side to side.

[0040] The arm cylinder 28 is rotatably supported on the third boom 21c at the cylinder side, and its rod end is rotatably supported on a bracket portion 37 provided on the base end side of the arm 22. The arm 22 swings around the connecting axis between the arm 22 and the third boom 21c, with the left-right direction being the axial direction, as the arm cylinder 28 extends and retracts.

[0041] The work tool cylinder 29 is provided along the length of the arm 22, with the cylinder side rotatably supported by a bracket portion 37 provided on the base end side of the arm 22, and the rod side end rotatably supported by a bracket portion 36 on the bucket 23 side. The bucket 23 swings around the connecting axis between the bucket 23 and the arm 22, with the left-right direction as the work tool cylinder 29 extends and retracts.

[0042] In the excavation machine 1 having the above configuration, the desired operation or work is performed by an operator seated in the driver's seat 15 who appropriately operates the travel lever or the work operation lever. Specifically, for example, by operating the travel lever, the excavation machine 1 is made to travel straight forward and backward and / or turn left and right. In addition, by operating the work operation lever, excavation work is performed by the excavation device 3, or soil removal work is performed by the soil removal device 4 and / or leveling work is performed.

[0043] In this embodiment of the excavation work machine 1, the configuration of the slewing frame 7 as a support structure will be further described. Figure 3 is a side view of the slewing frame 7, and Figure 4 is a plan view. Figures 5 and 6 are perspective views of the slewing frame 7. Figure 5 shows a perspective view from the upper left front, and Figure 6 shows a perspective view from the upper left rear. Note that the engine 12 is not shown in Figures 4 to 6.

[0044] The slewing frame 7 is a support structure that supports various pieces of equipment necessary for the operation of the cabin 10, the excavation device 3, and the excavation work machine 1, which are located on the upper slewing body 2B. The slewing frame 7 is composed of a bottom plate 71, a right vertical plate 19, an intermediate vertical plate 13, a left rear vertical plate 72, and a rear horizontal plate 73.

[0045] The base plate 71 is the base of the slewing frame 7 and has a roughly circular shape in plan view, formed as a flat plate from steel plate or the like. Multiple openings are formed in the base plate 71. A joint opening 77 for inserting a swivel joint is provided in the center of the base plate 71. The approximate center of the joint opening 77 is the pivot center C of the slewing frame 7. In addition, an engine-side opening 78 is provided on the rear side of the base plate 71.

[0046] The intermediate vertical plate 13 and the right vertical plate 19 extend parallel to each other in the front-rear direction, with the left-right direction being the plate thickness direction, to the right of the pivot center C of the pivot frame 7. The lower ends of the right vertical plate 19 and the intermediate vertical plate 13 are fixed to the bottom plate 71 by welding or the like.

[0047] The intermediate vertical plate 13 has a height at its front end, which is in front of the pivot center C, that allows it to support the left end of the pivot shaft 39a at a predetermined height, and also serves as a bulkhead to the cabin 10. The rear end of the intermediate vertical plate 13, which is behind the pivot center C, is sloped so that it fits under the engine 12, with the front end higher and the rear lower, and its lower end is supported by a weight 41, which will be described later. The length of the intermediate vertical plate 13 in the longitudinal direction is set to be about 1 / 2 to 2 / 3 the length of the bottom plate 71 in the longitudinal direction, so as not to interfere with the engine 12 and the oil pan 45.

[0048] The right vertical plate 19 is provided across the front-rear direction of the bottom plate 71 of the slewing frame 7. The front side of the right vertical plate 19 is formed to be the same height and shape as the front side of the intermediate vertical plate 13 in order to support the right end of the pivot shaft 39a at a predetermined height. The rear side of the right vertical plate 19 is formed to be lower than the front side in order to separate the right engine compartment 9a and the rear engine compartment 9b while ensuring an air passage between the two above. The left side of the rear side of the right vertical plate 19 is reinforced by a reinforcing plate 75. The reinforcing plate 75 is a member with its thickness in the left-right direction and is provided fixed to the upper surface of the bottom plate 71 and the left side of the right vertical plate 19 by welding or the like, reinforcing the right vertical plate 19.

[0049] The front portions of the intermediate vertical plate 13 and the right vertical plate 19 are arranged in pairs, and a pivot shaft 39a supporting the base end of the first boom 21a is installed between the intermediate vertical plate 13 and the right vertical plate 19.

[0050] The left rear vertical plate 72 extends in the front-rear direction with the left-right direction being the thickness direction, to the left of the pivot center C of the pivot frame 7. The left rear vertical plate 72 is the left vertical plate that forms a pair with the right vertical plate 19, which is located to the right of the pivot center C in the pivot frame 7 as a support structure. That is, on the bottom plate 71, the right vertical plate 19 and the left rear vertical plate 72 form a pair of left and right vertical plates. The intermediate vertical plate 13 is located between the right vertical plate 19 and the left rear vertical plate 72, which are the pair of left and right vertical plates, and corresponds to another vertical plate that is arranged parallel to the right vertical plate 19.

[0051] The height of the left rear vertical plate 72 is approximately the same as the rear side of the right vertical plate 19. The lower end of the left rear vertical plate 72 is fixed to the base plate 71 by welding or the like. The left side of the left rear vertical plate 72 is reinforced by a reinforcing plate 76. The reinforcing plate 76 is a member with its thickness in the left-right direction and is fixed to the upper surface of the base plate 71 and the left side of the left rear vertical plate 72 by welding or the like, reinforcing the left rear vertical plate 72. The left rear vertical plate 72 is provided parallel to the intermediate vertical plate 13 and the right vertical plate 19. The length of the left rear vertical plate 72 in the front-rear direction is approximately the length of the rear half of the base plate 71 up to the pivot center C. In a plan view, the left rear vertical plate 72 is provided overlapping with the rear side of the intermediate vertical plate 13 in the front-rear region from the pivot center C to approximately the rear end of the counterweight 41 described later, thereby ensuring the strength of the base plate 71 in the front-rear direction.

[0052] The rear cross plate 73 is a cross plate that connects a pair of left and right vertical plates (right vertical plate 19 and left rear vertical plate 72) at the rear of the engine 12. The rear cross plate 73 is provided so as to connect the rear end of the right vertical plate 19 and the rear end of the left rear vertical plate 72, with the plate thickness direction being the front-rear direction. The lower end of the rear cross plate 73 is fixed to the bottom plate 71 by welding or the like.

[0053] The area enclosed by the right vertical plate 19, the left rear vertical plate 72, and the rear horizontal plate 73 of the bottom plate 71 contains the engine lower opening 78. A cover 74 is removablely attached to the engine lower opening 78 (see Figure 6). An oil pan 45 is positioned above the cover 74, and the engine 12 is positioned above the oil pan 45.

[0054] In the excavation machine 1 according to this embodiment, in addition to the counterweight 7a, a weight 41 is provided on the slewing frame 7. The weight 41 is made of a steel plate material of a predetermined thickness which has a roughly rectangular shape when viewed from above. The weight 41 as a whole has a roughly rectangular prism shape which extends in the left-right direction. The weight 41, like the counterweight 7a, is for balancing with the excavation device 3.

[0055] In the slewing frame 7, the drilling device 3 is positioned in front of the slewing center C, while the counterweight 41 is positioned behind the slewing center C. More specifically, the counterweight 41 is positioned between the slewing center C of the slewing frame 7 and the oil pan 45.

[0056] The weight 41 consists of a main weight 41a, which has a roughly rectangular shape in plan view, and a roughly trapezoidal right weight 41b that protrudes to the right of the right vertical plate 19. The right weight 41b is formed from the same material as the main weight 41b and has the same thickness. The main weight 41a extends in the left-right direction, with the plate thickness direction being the vertical direction. The lower side of the main weight 41a is fixed to the bottom plate 71 by welding or the like. The right end of the main weight 41a is connected to the right vertical plate 19 via a reinforcing plate 75. The left end of the main weight 41a is connected to the left rear vertical plate 72. The left end of the right weight 41b is connected to the right vertical plate 19. The connection between the main weight 41a and the reinforcing plate 75 is fixed by welding or the like. The left end of the main weight 41a is fixed to the right side of the left rear vertical plate 72 by welding or the like. The left end of the right weight 41b is fixed to the right side of the right vertical plate 19 by welding or the like. The weight 41 is fixed to the bottom plate 71 and, by being directly or indirectly connected to the intermediate vertical plate 13, the right vertical plate 19, and the rear horizontal plate 73 fixed to the upper surface of the bottom plate 71, it also functions as a reinforcing member that structurally reinforces the bottom plate 71.

[0057] As shown in the side view of Figure 3, the engine 12 is positioned so that its front end protrudes above the weight 41. Also, as shown in Figure 4, the front end of the engine 12 is supported by engine front support members 81, 81 positioned on the left and right. The engine front support member 81 consists of a support column 81a erected on the upper surface of the weight 41 and a support plate 81b with a horizontal plate surface provided at the upper end of the support column 81a. The front end of the engine 12 is fixed to the support plate 81b by fastening members, etc. In other words, the weight 41 supports the engine 12 via the engine front support members 81, 81. The rear end of the engine 12 is also supported by engine rear support members 82, 82. The engine rear support members 82, 82 that support the rear end of the engine 12 consist of support plates provided at the upper end of the rear cross plate 73.

[0058] An oil pan 45 is located at the bottom of the engine 12. The oil pan 45 is situated in a space enclosed on all four sides by a right vertical plate 19, a left rear vertical plate 72, a rear horizontal plate 73, and a weight 41.

[0059] A rear frame 83 is provided on the bottom plate 71 of the slewing frame 7 so as to surround the engine 12. The rear frame 83 consists of a right support column 84 erected on the right side of the rear end of the bottom plate 71, a left support column 85 positioned on the left side of the rear end of the bottom plate 71, an upper plate portion 86 spanning the upper ends of the right support column 84 and the left support column 85, a right frame portion 87 provided in a roughly inverted L shape forward from the right support column 84, and a left frame portion 88 provided in a roughly inverted L shape forward from the left support column 85.

[0060] The lower ends of the left support column 85 and the left frame section 88 are directly fixed to the bottom plate 71 by fastening members. The lower end of the right support column 84 is fixed to the upper part of the connection between the rear horizontal plate 73 and the right vertical plate 19 by fastening members. In addition, the lower end of the right frame section 87 is fixed to the upper surface of the weight 41 by fastening members.

[0061] Furthermore, the rear side of the cabin frame 11b of the cabin 10 is connected to the upper plate portion 86. The cabin frame 11b is a support member that supports the roof portion 11a above the driver's compartment. Therefore, the rear frame 83 can be said to be a support body that further supports the support member that supports the roof portion 11a above the driver's compartment. Note that if, for example, a so-called canopy roof without a door on the left side is adopted instead of the cabin 10, a canopy support portion that supports the roof portion that is provided in an overhanging manner above the driver's compartment is connected to the upper plate portion 86. In this case as well, the rear frame 83 can be said to be a support body that further supports the support member that supports the roof portion above the driver's compartment.

[0062] In the slewing frame 7 of the excavation work machine 1 according to this embodiment, a roughly plate-shaped main weight 41a is positioned between the slewing center C and the oil pan 45, with its thickness direction being vertical relative to the upper surface of the bottom plate 71. As a result, the main weight 41a can support the rear frame 83 and the engine 12. By setting the plate thickness of the main weight 41a lower than the upper end position of the oil pan 45, clearance is secured between the engine 12 and the main weight 41a, preventing interference between them. In other words, by employing a weight 41 that can be positioned between the slewing center C and the oil pan 45 without interfering with other equipment located in the engine room 9, the weight behind the slewing center C can be increased. Conventionally, in order to increase the weight behind the upper slewing body 2B in order to improve the lifting capacity of the excavation device 3, a counterweight 7a was added to further increase the weight at the rear. On the other hand, if the rear section of the upper rotating body 2B is extended by adding a counterweight 7a, for example, when rotating in a workspace, it is necessary to position the excavation machine 1 in a way that ensures sufficient distance from surrounding walls, etc., taking into account the length of the protruding portion of the added counterweight 7a. In the excavation machine 1 according to this embodiment, the lifting capacity of the excavation device 3 can be improved without extending the length of the rear end of the upper rotating body 2B in the front-rear direction by adding a counterweight 7a, as in the conventional method. Therefore, it becomes possible to perform excavation work and other operations in narrower workspaces, and work efficiency can also be improved.

[0063] The excavation work machine 1 of this embodiment, having the configuration described above, can be said to have the following configuration. That is, the excavation work machine 1 is a work machine comprising a lower traveling body 2A, an upper rotating body 2B supported by the lower traveling body 2A, and a work machine (excavation device 3) supported by the upper rotating body 2B, wherein the upper rotating body 2B comprises a rotating frame 7 having a bottom plate 71 and being rotatably supported by the lower traveling body 2A, an engine 12 positioned behind the pivot center C of the rotating frame 7 on the bottom plate 71, an oil pan 45 positioned between the bottom plate 71 and the engine 12 in the vertical direction, and a counterweight 41 positioned between the oil pan 45 on the bottom plate 71 and the pivot center C in the front-rear direction with the left-right direction extending.

[0064] According to the excavation work machine 1 of this embodiment, a weight is provided inside the upper slewing body 2B between the oil pan 45 placed on the bottom plate 71 of the slewing frame 7 and the slewing center C of the slewing frame 7. This allows the weight behind the slewing center C to be increased inside the upper slewing body 2B without interfering with other equipment. This makes it possible to improve the lifting capacity of the work machine (excavation device 3) without extending the length of the rear end of the upper slewing body 2B in the front-rear direction, unlike when the shape of the conventional counterweight 7a is changed to increase the weight. As a result, the rear end does not protrude beyond the total width of the running sections 5, 5 (the width of the left and right ends of the pair of tracks) when the upper slewing body 2B is rotated, improving the workability of the excavation work machine 1 in narrower spaces.

[0065] Furthermore, in the excavation work machine 1, the counterweight 41 is positioned below the engine 12.

[0066] With this configuration of the excavation work machine 1, it is possible to effectively utilize the space below the engine 12 and increase the weight of the upper rotating body 2B behind the pivot center C.

[0067] Furthermore, in the excavation work machine 1, the bottom plate 71 is provided with left and right vertical plates (right vertical plate 19, left rear vertical plate 72) extending in the front-rear direction, and the weight 41 (main weight 41a) is positioned between the left and right vertical plates (right vertical plate 19, left rear vertical plate 72).

[0068] With this configuration of the excavation work machine 1, it is possible to reinforce the space between the right vertical plate 19 and the left rear vertical plate 72 of the bottom plate 71 with a weight 41 while maintaining good weight balance between the left and right sides of the slewing frame.

[0069] Furthermore, in the excavation work machine 1, the weight 41 (main weight 41a) is connected to the left and right vertical plates (right vertical plate 19, left rear vertical plate 72). Specifically, the left and right ends of the main weight 41a are connected to the left and right vertical plates (right vertical plate 19, left rear vertical plate 72) by fixing means such as welding.

[0070] Furthermore, in the excavation work machine 1, the weight 41 is formed to be directly or indirectly integrated with the left and right vertical plates (right vertical plate 19, left rear vertical plate 72). An example of direct integration is to directly fix the left and right ends of the weight 41 to the left and right vertical plates (right vertical plate 19, left rear vertical plate 72) by fixing means such as welding. An example of indirect integration is to interpose other members such as reinforcing plates 75 between the left and right vertical plates (right vertical plate 19, left rear vertical plate 72) and the left and right ends of the weight 41 and fix their relative positions by fixing means such as welding.

[0071] In this embodiment, the right end face of the main weight 41a is joined to the left side of the reinforcing plate 75, and the right side of the reinforcing plate 75 is joined to the left side of the right vertical plate 19, and these joints are fixed by welding. In other words, the main weight 41a and the right vertical plate 19 are indirectly integrated by interposing the reinforcing plate 75 between them. On the other hand, the main weight 41a and the right vertical plate 19 may be directly integrated without the interposition of other members. In this case, the length of the reinforcing plate 75 in the front-rear direction is shortened, and the reinforcing plate 75 is positioned on the bottom plate 71 so that the position of the front end of the reinforcing plate 75 does not overlap with the length of the main weight 41a in the front-rear direction. Then, the main weight 41a and the right vertical plate 19 can be integrated by fixing the joint between the right end face of the main weight 41a and the left side of the right vertical plate 19 by welding.

[0072] With this configuration of the excavation work machine 1, by connecting the weight 41 to the left rear vertical plate 72 and the right vertical plate 19, the weight 41 reinforces the left rear vertical plate 72 and the right vertical plate 19, and the weight 41 can also function as a reinforcing member in the left-right direction of the bottom plate 71. Therefore, the rigidity of the slewing frame 7 can be increased.

[0073] In addition, in the excavation work machine 1, the weight 41 may extend through at least one of the left and right vertical plates (right vertical plate 19, left rear vertical plate 72) (right vertical plate 19).

[0074] In this embodiment, the weight 41 is composed of two separate components: a main weight 41a and a right weight 41b. However, it may also be composed of a single component. If the weight 41 is a single component, the portion corresponding to the right weight 41b will be the portion that extends to the right, passing through the right vertical plate 19.

[0075] With this configuration of the excavation work machine 1, the weight 41 can be installed by passing through at least one of the pair of vertical plates (the right vertical plate 19), thereby reinforcing the vertical plate (the right vertical plate 19). Therefore, the rigidity of the slewing frame 7 can be increased.

[0076] In addition, in the excavation work machine 1, the engine 12 is supported by the weight 41 via a front support member (engine front support member 81) that supports the front of the engine 12.

[0077] With this configuration of the excavation machine 1, the counterweight 41 can be used as part of the support structure for the engine 12. This makes it possible to stably mount heavy equipment such as the engine 12.

[0078] In addition, in the excavation work machine 1, a horizontal plate (rear horizontal plate 73) is positioned on the bottom plate 71, connecting the left and right vertical plates (right vertical plate 19, left rear vertical plate 72) behind the engine 12, and the engine 12 is supported by the horizontal plate (rear horizontal plate 73) via a rear support member (engine rear support member 82) that supports the rear side of the engine 12.

[0079] With this configuration of the excavation machine 1, the rigidity of the base plate 71 is further improved by connecting the right vertical plate 19 and the left rear vertical plate 72 behind the engine 12 with the rear horizontal plate 73. Therefore, the stability of supporting heavy equipment such as the engine 12 is improved.

[0080] Furthermore, in the excavation work machine 1, at the front of the bottom plate 71, another vertical plate (intermediate vertical plate 13) is provided between the left and right vertical plates, parallel to one of the left and right vertical plates (right vertical plate 19), and the base end of the work machine (excavation device 3) is supported by a support part (boom support part 39) provided between one of the left and right vertical plates (right vertical plate 19) and the other vertical plate (intermediate vertical plate 13).

[0081] With this configuration of the excavation work machine 1, the bottom plate 71 is also reinforced by other vertical plates (intermediate vertical plates 13) that constitute the attachment portion of the excavation device 3 equipped with an offset boom to the slewing frame 7. By increasing the rigidity of the bottom plate 71 in this way, it becomes possible to stably attach heavy equipment such as the excavation device 3.

[0082] Furthermore, in the excavation work machine 1, a rear frame 83 is provided on the rear side of the bottom plate 71 so as to straddle the top of the engine 12, and the lower end of the rear frame 83 is connected to the bottom plate 71 via a weight 41 and / or a side plate (rear side plate 73). More specifically, the right frame portion 87 of the rear frame 83 is supported to the bottom plate 71 by fastening members such as bolts via a main weight 41a, and the right support column 84 of the rear frame 83 is connected to the bottom plate 71 via a rear side plate 73 by fastening members such as bolts.

[0083] With this configuration of the excavation work machine 1, by using the weight 41 and / or the lateral plate (rear lateral plate 73) as support for the rear frame 83 of the slewing frame 7, it becomes possible to utilize the space for housing equipment within the slewing frame 7 more effectively. Furthermore, with the configuration in which the rear frame 83 is supported by the weight 41 or the lateral plate (rear lateral plate 73), the right support column 84 and the right frame section 87 can be made relatively shorter compared to the configuration in which the rear frame 83 is supported only by the bottom plate 71, thereby improving the rigidity of the machine. As a result, heavy objects such as the cabin 10 and canopy can be stably supported by the rear frame 83.

[0084] The above-described embodiments are merely examples of the present invention, and the work machines according to the present invention are not limited to the embodiments described above. Therefore, even in embodiments other than those described above, various modifications are possible depending on the design, etc., as long as they do not depart from the technical spirit of the present invention. Furthermore, the effects described in this disclosure are merely illustrative and not limiting, and other effects may also exist.

[0085] Furthermore, the present invention can take the following forms. (1) A work machine comprising a lower traveling body, an upper rotating body supported by the lower traveling body, and a work machine supported by the upper rotating body, The upper rotating body is, A swivel frame having a base plate and rotatably supported by the lower traveling body, An engine positioned behind the pivot center of the pivot frame on the base plate, An oil pan positioned between the bottom plate and the engine in the vertical direction, A weight extending in the left-right direction between the oil pan on the base plate and the pivot center, A work machine characterized by being equipped with the following features. (2) The aforementioned weight is positioned below the engine. The work machine described in (1) above. (3) The bottom plate is provided with left and right vertical plates extending in the front-to-back direction. The aforementioned weight is positioned between the left and right vertical plates, The work machine described in (1) or (2) above. (4) The aforementioned weight is formed to be directly or indirectly integrated with the left and right vertical plates. The work machine described in (3) above. (5) The engine is supported by the weight via a front support member that supports the front side of the engine. A work machine as described in any one of (1) to (4) above. (6) A horizontal plate is positioned on the bottom plate, connecting the left and right vertical plates at the rear of the engine. The engine is supported on the lateral plate via a rear support member that supports the rear side of the engine. A work machine as described in any one of (3) to (5) above. (7) At the front of the base plate, another vertical plate is provided between the left and right vertical plates, parallel to one of the left and right vertical plates. The base end of the work machine is supported by a support provided between one of the left and right vertical plates and the other vertical plate. A work machine as described in any one of (3) to (6) above. (8) A rear frame is provided on the rear side of the bottom plate so as to straddle the top of the engine. The lower end of the rear frame is connected to the bottom plate via the weight and / or the cross plate. The work machine described in (6) or (7) above. [Explanation of Symbols]

[0086] 1. Excavation equipment (working machinery) 2. Running vehicle 2A Lower running body 2B Upper rotating body 3. Excavation equipment (working equipment) 4 Earth removal equipment 5. Running section 7. Swivel Frame 9. Engine Room 10 cabins 11a Roof section 11b Cabin Frame 12 Engines 13. Intermediate vertical board (other vertical boards) 19 Right vertical board 14 doors 21 Boom 21a First boom 21b Second boom 21st century, 3rd boom 22 Arms 23 buckets 24 Offset Links 26 Boom Cylinder 27 Offset Cylinder 28 Arm Cylinder 29. Cylinder work tool 39 Boom support section 41 Weight 45 Oil pan 71 Bottom plate 72. Left rear vertical panel (left vertical panel) 73 Rear side panel (side panel) 74 Lid 75 Reinforcement plate 76 Reinforcement plate 77 Joint opening 81 Engine front support section (front support member) 82. Rear engine support section (rear support member) 83 Rear frame 84 Right support column 87 Right frame section

Claims

1. A work machine comprising a lower traveling body, an upper rotating body supported by the lower traveling body, and a work machine supported by the upper rotating body, The upper rotating body is, A swivel frame having a base plate and rotatably supported by the lower traveling body, An engine positioned behind the pivot center of the pivot frame on the base plate, An oil pan positioned between the bottom plate and the engine in the vertical direction, A weight extending in the left-right direction between the oil pan on the base plate and the pivot center, A work machine characterized by being equipped with the following features.

2. The aforementioned weight is positioned below the engine. The work machine according to claim 1.

3. The bottom plate is provided with left and right vertical plates extending in the front-to-back direction. The working machine according to claim 1, wherein the weight is positioned between the left and right vertical plates.

4. The aforementioned weight is formed to be directly or indirectly integrated with the left and right vertical plates. The work machine according to claim 3.

5. The engine is supported by the weight via a front support member that supports the front side of the engine. A working machine according to any one of claims 1 to 4.

6. A horizontal plate is positioned on the bottom plate, connecting the left and right vertical plates at the rear of the engine. The engine is supported on the lateral plate via a rear support member that supports the rear side of the engine. The work machine according to claim 3 or claim 4.

7. At the front of the base plate, another vertical plate is provided between the left and right vertical plates, parallel to one of the left and right vertical plates. The base end of the work machine is supported by a support provided between one of the left and right vertical plates and the other vertical plate. The work machine according to claim 3 or claim 4.

8. A rear frame is provided on the rear side of the bottom plate so as to straddle the top of the engine. The lower end of the rear frame is connected to the bottom plate via the weight and / or the cross plate. The work machine according to claim 6.

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