JP4697287B2 - Construction machine frame structure - Google Patents

Description

  The present invention relates to a frame structure of a construction machine.

  Conventionally, a construction machine such as a hydraulic excavator having a crawler type lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body, and a work attachment provided on the front side of the upper revolving body is known. (For example, refer to Patent Document 1). On the lower side of the upper revolving structure, a revolving frame is provided as a support structure for mounting an engine, a hydraulic pump, a driver's seat, a counterweight, and the like. The swivel frame has a configuration in which reinforcing ribs are welded to the left and right sides of the center portion in the width direction of the flat bottom plate so as to obtain strength and rigidity against excavation load during excavation work.

  Here, when the thickness of the bottom plate of the revolving frame is thin, welding distortion may occur during welding of the reinforcing rib. In order to eliminate such welding distortion, a frame structure of a construction machine has been developed in which a swivel frame and a reinforcing rib are integrally formed by casting to obtain sufficient strength and rigidity (for example, Patent Documents). 2 and 3).

By the way, in the frame structure of a conventional construction machine, in particular, the frame structure described in Patent Document 3, four support members standing from the bottom plate of the swing frame are integrally formed with the swing frame by casting. A fastening hole is formed on the upper surface of the column member, and the engine is mounted on the upper surface of the column member via the engine mount and fastened with a fastening bolt or the like from above the engine to fix the engine to the turning frame. Like to do.
JP 2001-107388 A Japanese Patent Laying-Open No. 2005-2572 JP 2007-303129 A

  However, since the conventional construction machine frame structure is configured to fasten the fastening bolt for fixing the engine to the turning frame from above the engine, when a hydraulic tube or the like is routed above the engine, The hydraulic tube gets in the way, and the installation workability of the engine deteriorates. Therefore, there has been a demand to be able to fasten the fastening bolt from below the engine.

  Specifically, the support bracket that supports the engine is configured to have a standing part that stands from the bottom plate of the swivel frame, and a flat part that projects horizontally from the upper end of the standing part to support the engine, If a clearance is provided as a working space between the bottom plate of the swivel frame and the flat part of the support bracket, the engine placed on the flat part of the support bracket via the engine mount can be mounted from below the engine with fastening bolts. It can be fastened and the mounting workability is improved.

  However, when the turning frame and the support bracket are integrally formed by casting, it is difficult to provide a gap between the bottom plate of the turning frame and the flat portion of the support bracket. In other words, after casting the molten metal into a pair of upper and lower molds, casting the mold and then releasing the mold up and down, the swivel frame is taken out, so that it projects horizontally like the flat part of the support bracket. If there is such a portion, the metal flows into the gap between the bottom plate of the revolving frame and the flat portion of the support bracket, so that the mold cannot be released up and down.

  Therefore, in the mold before pouring molten metal, a core is arranged at a position corresponding to the gap between the bottom plate of the swivel frame and the flat portion of the support bracket, and casting is performed so that the metal does not flow into this gap. However, it is conceivable to remove the core and then provide a gap. However, in this case, it is necessary to separately install and remove the core, which increases the number of work steps.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a frame structure for a construction machine that can easily integrally form a revolving frame and a support bracket by casting without using a core. There is to do.

  In order to achieve the above-described object, the present invention has been made by contriving the shape of the bottom plate of the swivel frame so that the swivel frame and the support bracket can be easily formed integrally without using a core during casting.

  Specifically, the present invention is directed to a frame structure of a construction machine in which an upper-part turning body having an engine is rotatably mounted on a lower traveling body, and the following solution is taken.

That is, according to the first aspect of the present invention, the revolving frame disposed on the lower side of the upper revolving structure and the support bracket that supports the engine are integrally formed by casting,
The support bracket has an upright portion erected from the bottom plate of the revolving frame, and a flat portion that extends horizontally from the upper end portion of the erection portion and supports the engine.
A through hole is formed at a position overlapping at least the planar portion of the support bracket in a plan view on the bottom plate of the swivel frame ,
The through hole is formed in such a size that the planar portion is positioned in the through hole in a plan view .

In the invention of claim 1, the turning frame is arranged on the lower side of the upper turning body. A support bracket that supports the engine is integrally formed on the revolving frame by casting. The support bracket has a standing part standing from the bottom plate of the revolving frame and a flat part projecting horizontally from the upper end of the standing part to support the engine. A through hole is formed in the bottom plate of the swivel frame at a position that overlaps at least the flat portion of the support bracket in plan view. The through hole is formed in such a size that the planar portion is positioned in the through hole in plan view.

In this manner, a through hole having a size such that the planar portion is located in the hole in plan view is formed at a position overlapping at least the planar portion of the support bracket in plan view on the bottom plate of the swivel frame. Thus, even when there is a portion projecting in the horizontal direction, such as the flat portion of the support bracket, a gap as a work space is provided between the bottom plate of the swivel frame and the flat portion of the support bracket without using a core during casting. Can be provided. Thereby, for example, even when the pilot tube connected to the operation lever or the like is routed above the engine, the engine placed on the flat portion of the support bracket is installed to avoid the pilot tube. Since the fastening bolts can be fastened from below the engine, the mounting workability is improved.

  Specifically, in the conventional frame structure, if there is a portion that protrudes in the horizontal direction, such as the flat portion of the support bracket, the molten metal is poured into a pair of upper and lower molds and cast, and then the mold is separated vertically. When the swivel frame is taken out by molding, the metal also flows into the gap between the bottom plate of the swivel frame and the flat portion of the support bracket, so that the mold cannot be released vertically. Therefore, it is conceivable to remove the core after casting so that the metal does not flow by placing the core in advance at the location corresponding to this gap, but because the installation and removal work of the core is required separately, There was a problem that the number of work steps increased.

  On the other hand, in the present invention, the core is not disposed at a location corresponding to the gap between the bottom plate of the revolving frame and the flat portion of the support bracket, but the corresponding location in the lower mold is bulged. I have to. Therefore, when casting the molten metal by casting the molten metal into a pair of upper and lower molds and then releasing the mold up and down, the bottom plate of the revolving frame has a through-hole corresponding to the bulging portion. Thus, the mold can be released smoothly. Thereby, the operation | work which attaches and removes a core becomes unnecessary, and a turning frame and a support bracket can be integrally formed easily.

The invention of claim 2 is the invention according to claim 1,
A swivel joint that is provided at a turning center position of the turning frame and connects hydraulic tubes provided on the upper turning body and the lower traveling body;
The through hole is formed so that the swivel joint is visible from below the swivel frame.

  In the invention of claim 2, the swivel joint that connects the hydraulic tubes provided in the upper revolving structure and the lower traveling structure is provided at the revolving center position of the revolving frame. From the through hole formed in the bottom plate of the swivel frame, the swivel joint is visible from below the swivel frame.

  With such a configuration, the operator can visually recognize the swivel joint from the through-hole formed in the bottom plate of the swivel frame, and can easily perform the work of connecting the hydraulic tube to the swivel joint. improves.

The invention of claim 3 is the invention according to claim 1
The through hole is formed so that the engine supported by the support bracket is visible from below the revolving frame.

  In the invention of claim 3, the engine is visible from the lower side of the turning frame through the through hole formed in the bottom plate of the turning frame.

  With such a configuration, the operator can visually recognize the engine from the through hole formed in the bottom plate of the turning frame, the engine maintenance work can be easily performed, and workability is improved.

According to the present invention, a through-hole having a size such that the planar portion is located in the hole in plan view is formed at a position overlapping at least the planar portion of the support bracket in plan view on the bottom plate of the swivel frame. This makes it possible to release the mold up and down without using a core at the time of casting, even when there is a part that protrudes horizontally like the flat part of the support bracket. A gap as a work space can be provided between the flat portion of the support bracket. Thereby, for example, even when the pilot tube connected to the operation lever or the like is routed above the engine, the engine placed on the flat portion of the support bracket is installed to avoid the pilot tube. Since the fastening bolts can be fastened from below the engine, the mounting workability is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view showing a configuration of a construction machine according to an embodiment of the present invention, and FIG. 2 is a perspective view when the upper swing body is viewed obliquely from the rear. As shown in FIGS. 1 and 2, the construction machine 1 is a canopy-spec small excavator, a so-called mini excavator, and a lower traveling body 20 on which crawlers 21 and 21 are mounted and a swivel on the lower traveling body 20. And an upper revolving unit 30 mounted thereon. And it is comprised in the back small turning type so that the turning radius of the rear end of the upper turning body 30 may be settled within the vehicle width of the lower traveling body 20.

  The upper swing body 30 is provided with an operation space A for arranging the driver's seat 5, the control box 6, and the like. An engine storage space for storing the engine 40 is provided at the rear of the operation space A, and is covered with the engine cover 22. The engine 40 is supported by a support bracket 35 to be described later via an engine mount 41, so that the engine 40 is attached to the turning frame 31 disposed on the lower side of the upper turning body 30. On the upper side of the engine cover 22, a driver's seat 5 for an operator to sit is provided. On the left side of the driver's seat 5, an equipment space for storing hydraulic equipment is provided and covered with a side cover 23. A fuel tank (not shown) is provided on the right side of the driver seat 5 and is covered with a side cover 23.

  The left front of the driving space A is opened as an entrance for an operator to get on and off the driver's seat 5, and the floor F is provided with an uneven portion for preventing slipping and mud adhering to the shoe sole. It has been.

  A swing post 14 is provided on the front side of the upper swing body 30 to connect the front attachment 10 that can be replaced depending on the work application. A swing bracket 15 capable of rotating the front attachment 10 about a vertical axis 14a is connected to the swing post 14.

  The front attachment 10 includes a boom 11, an arm 12, a bucket 13, and a boom cylinder 11a, an arm cylinder 12a, and a bucket cylinder 13a for driving the boom 11, and a base end portion of the boom 11 is connected to a swing bracket 15. Yes. Here, when the boom cylinder 11a is extended and contracted, the boom 11 can be switched from a state where the boom 11 is tilted forward to a state where the boom 11 is driven to the driver's seat 5 side and lifted. The swing bracket 15 swings in the left-right direction by expanding and contracting the swing cylinder 15a (see FIG. 4).

  Control boxes 6 for performing various controls are provided on the left and right sides of the driver seat 5. An operation lever 7 for driving the front attachment 10 is provided at the front end of the control box 6.

  An operation lever 8 extending upward from the floor surface F of the upper swing body 30 is provided in front of the driver seat 5. By operating the operation lever 8, the lower traveling body 20 can be moved forward or backward. A lower front guard 9 that protects the lower position of the driver's seat 5 is disposed in front of the movable range of the operation lever 8.

  Further, surrounding the driver's seat 5, a front canopy post 25 is provided at the front right side, a rear canopy post 26 is provided at the rear right side, and a side canopy post is provided at the left side of the driver's seat 5 (side of the entrance / exit). 27 are erected. A roof 28 for protecting the operator against falling objects from the overhead is attached to each upper end portion of the front canopy column 25, the rear canopy column 26, and the side canopy column 27, and the roof 28 is operated. It supports so that it may arrange | position above the seat 5. FIG.

  Next, the structure of the turning frame 31 arranged on the lower side of the upper turning body 30 that is a characteristic part of the present invention will be described. 3 is a perspective view showing the configuration of the revolving frame, FIG. 4 is a plan view, and FIG. 5 is a plan view when the revolving frame is viewed from below.

  As shown in FIGS. 3 to 5, the turning frame 31 includes an engine 40 as a drive source, a hydraulic pump 43 that discharges hydraulic oil, a control valve 44 that controls supply of hydraulic oil discharged from the hydraulic pump 43, and the like. Is configured as a support structure for mounting a flat bottom plate 32, a front side wall 32a, a rear side wall 32b, a left side wall 32c, The side wall 32d and the support bracket 35 that supports the engine 40 are integrally formed by casting.

  The front side wall 32a and the rear side wall 32b of the revolving frame 31 are erected so as to be one step higher than the left side wall 32c and the right side wall 32d. A swing post 14 for connecting the front attachment 10 is integrally formed by casting at the front portion of the front side wall 32a. A cylinder insertion hole 29 penetrating in the thickness direction is formed on the left side of the swing post 14 in the front side wall 32a, and the rod tip of the swing cylinder 15a is inserted therethrough.

  On the front part of the rear side wall 32b of the revolving frame 31, a counterweight 33 is integrally formed by casting. The counter weight 33 is provided to balance the weight with the front attachment 10, and is formed as a thick and heavy plate.

  A swivel joint 50 is provided at the turning center position of the turning frame 31. The swivel joint 50 connects the hydraulic tubes 45 provided in the upper swing body 30 and the lower traveling body 20, respectively, and rotates in conjunction with the swing operation of the upper swing body 30. 45 is held so as not to twist.

  Reinforcing ribs 34 that are bifurcated from the vicinity of the swing post 14 of the front side wall 32a toward the rear side wall 32b are erected on the left and right sides of the center portion in the width direction of the bottom plate 32 of the swivel frame 31. The reinforcing rib 34 is integrally formed with the bottom plate 32 by casting so as to obtain strength and rigidity against excavation load during excavation work.

  A pipe insertion hole 34 a penetrating in the thickness direction is formed at the proximal end portion in the standing direction at a position closer to the front side of the reinforcing rib 34. The pipe insertion hole 34 a is a hole through which a hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44 respectively disposed at both left and right ends with the reinforcing rib 34 interposed therebetween is inserted.

  Specifically, a hydraulic pump 43 is disposed at the left rear position of the revolving frame 31, and a control valve 44 is disposed at the right front position, both of which are connected via a hydraulic tube 45. . The hydraulic tube 45 is bundled by a bundling member 46 and routed along the upper surface of the bottom plate 32 of the revolving frame 31, and is inserted through the pipe insertion hole 34 a of the reinforcing rib 34 in the middle thereof.

  In addition, a communication hole 34 b that penetrates in the thickness direction and communicates with the pipe insertion hole 34 a is formed at a position corresponding to the pipe insertion hole 34 a in the bottom plate 32 of the revolving frame 31. By forming such a communication hole 34b, when the turning frame 31 and the reinforcing rib 34 are integrally formed by casting, there is no need to arrange a core at a location corresponding to the pipe insertion hole 34a. The pipe insertion hole 34a can be easily formed simply by releasing the upper and lower parts.

  Specifically, at the time of casting the revolving frame 31, a core is not disposed at a position corresponding to the pipe insertion hole 34a of the reinforcing rib 34, but a corresponding position in the lower mold is bulged. . Therefore, when the molten metal is poured into a pair of upper and lower molds that are cast and cast, and then the revolving frame 31 is taken out by releasing the mold vertically, the bottom plate 32 of the revolving frame 31 corresponds to the bulging portion. Thus, the pipe insertion hole 34a and the communication hole 34b are formed, and the mold can be released smoothly. Thereby, the operation | work which attaches and removes a core becomes unnecessary, and the turning frame 31 and the reinforcement rib 34 can be integrally formed easily.

  Further, when the hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44 is routed along the upper surface of the bottom plate 32 of the revolving frame 31, the hydraulic tube 45 can be viewed from the communication hole 34b or via the communication hole 34b. The operation of gripping the hydraulic tube 45 and inserting it into the pipe insertion hole 34a can be easily performed. In addition, since the hydraulic tube 45 and other piping (for example, a pilot tube, etc.) can be separated from each other in the height direction, these tubes do not overlap each other, so that a sufficient working space can be provided during maintenance of the apparatus. It can be secured widely and workability is improved.

  An engine 40 (see FIG. 1) is mounted at the rear position of the turning frame 31. The engine 40 is supported by the support bracket 35 via the engine mount 41. The engine mount 41 is made of an elastic body such as resin or rubber, and absorbs vibration of the engine 40 to reduce transmission of the vibration to the revolving frame 31.

  The support bracket 35 is integrally formed with the turning frame 31 by casting. The support bracket 35 has an upright portion 35a that is erected from the bottom plate 32 of the revolving frame 31, and a flat surface portion 35b that protrudes horizontally from the upper end portion of the erected portion 35a. A bolt insertion hole 35c for inserting the fastening bolt 42 is formed in the flat portion 35b.

  Four support brackets 35 are arranged at intervals in the front, rear, left, and right inside the revolving frame 31, and the flat portions 35b are coplanar. The engine 40 is mounted on the flat surface portion 35b via an engine mount 41, and the engine 40 is fastened to the support bracket 35 by fastening bolts 42 inserted from below the engine 40 via bolt insertion holes 35c. .

  Of the plane portions 35b of the four support brackets 35, the plane portion 35b provided at the front left and right positions is from the upper end of the standing portion 35a that is erected from the substantially center position in the front-rear direction of the left and right reinforcing ribs 34. It protrudes inward in the horizontal direction. Further, the flat portion 35b provided at the left and right positions on the rear side protrudes from the upper end portion of the rear side wall 32b as the standing portion 35a toward the front in the horizontal direction.

  Here, a through hole 36 is formed in the bottom plate 32 of the revolving frame 31 at a position overlapping the flat portion 35b of the support bracket 35 in plan view. Specifically, the through-hole 36 corresponding to the flat portion 35b provided at the left and right positions on the front side is formed at a position where the swivel joint 50 can be visually recognized through the left and right reinforcing ribs 34. Further, the through hole 36 corresponding to the flat portion 35b provided at the left and right positions on the rear side penetrates so as to be surrounded by the rear side wall 32b and the left and right reinforcing ribs 34 and is positioned so that the engine 40 can be seen. Is formed.

  Thus, in the present embodiment, the through hole 36 is formed at a position that overlaps the planar portion 35b of the support bracket 35 in the bottom plate 32 of the revolving frame 31 in plan view. The reason is as follows.

  That is, when the swivel frame 31 and the support bracket 35 are to be integrally formed by casting, if there is a portion projecting in the horizontal direction, such as the flat portion 35b of the support bracket 35, it is melted into a mold combined with a pair of upper and lower sides. After casting the cast metal and casting it, the mold flows into the gap between the bottom plate 32 of the swivel frame 31 and the flat portion 35b of the support bracket 35 when the swivel frame 31 is taken out by releasing the mold up and down. Therefore, it is impossible to release the mold up and down. Therefore, it is conceivable to remove the core after casting so that the metal does not flow by placing the core in advance at the location corresponding to this gap, but because the installation and removal work of the core is required separately, There was a problem that the number of work steps increased.

  On the other hand, in the present embodiment, the core is not disposed at a position corresponding to the gap between the bottom plate 32 of the revolving frame 31 and the flat portion 35b of the support bracket 35, but a corresponding position in the lower mold. To bulge out. Therefore, when the molten metal is poured into a pair of upper and lower molds that are cast and cast, and then the revolving frame 31 is taken out by releasing the mold vertically, the bottom plate 32 of the revolving frame 31 corresponds to the bulging portion. Thus, the through hole 36 is formed, and the mold can be released smoothly. Thereby, the operation | work which attaches and removes a core becomes unnecessary, and the turning frame 31 and the support bracket 35 can be integrally formed easily.

  Further, since the through hole 36 corresponding to the flat portion 35b provided in the left and right positions on the front side is formed at a position where the swivel joint 50 can be visually recognized, the operator can pass through the through hole 36 from below the swivel frame 31. The work of connecting the hydraulic tube 45 to the swivel joint 50 can be easily performed while visually confirming the swivel joint 50, and the workability is improved.

  Further, since the through hole 36 corresponding to the flat portion 35b provided in the left and right positions on the rear side is formed at a position where the engine 40 can be visually recognized, the operator can visually recognize the engine 40 from below the turning frame 31. The maintenance work of the engine 40 can be easily performed and the workability is improved. Further, even when a pilot tube (not shown) connected to the operation lever 7 or the like or other electrical wiring or the like is routed above the engine 40, the support bracket 35 is provided to avoid the pilot tube or the like. Since the engine 40 placed on the flat surface portion 35b can be fastened from the lower side of the engine 40 by the fastening bolts 42, the mounting workability is improved.

  In addition to the through-hole 36 described above, the bottom plate 32 of the swivel frame 31 is removed with a space in the front-rear direction at a position outside the left and right reinforcing ribs 34 in order to reduce the weight of the swivel frame 31. A hole 38 is formed.

  A guide portion 37 erected from the bottom plate 32 is integrally formed by casting in the vicinity of the left side wall 32c and the right side wall 32d of the revolving frame 31 and on the inner side. The guide portions 37 are provided at intervals in the front-rear direction, and a total of four guide portions 37 are arranged on the left and right sides. A sealing material (not shown) is provided in the gap between the left guide portion 37 and the left side wall 32c, and the lower edge of the side cover 23 is fitted into this gap while sealing the lower end edge with the sealing material. The movement of the side cover 23 in the thickness direction is restricted, and rainwater or the like is prevented from entering the vehicle body. Similarly, the right side cover 23 is restricted from moving in the thickness direction by fitting the lower end edge into the gap between the right guide portion 37 and the right side wall 32d.

  Here, the upper surfaces of the four guide portions 37 arranged in the front-rear direction at the left and right positions of the revolving frame 31 are formed on the same plane, and serve as a reference surface when the revolving frame 31 is cut. . Specifically, after the swivel frame 31 is integrally formed by casting, it is necessary to perform cutting on a portion where flatness such as the flat portion 35b of the support bracket 35 is required. If the turning frame 31 is placed on a work table (not shown) in a state where the revolving frame 31 is turned downward so that the flat portion is secured and the corresponding portion is cut, the processing can be performed with high accuracy. . In addition, although the guide part 37 used as a reference surface was provided in four places in the revolving frame 31, if it is provided in at least two places, the flatness at the time of a cutting process can be ensured.

  A swing cylinder bracket 39 that rotatably supports the base end portion of the swing cylinder 15a is provided at a substantially central position in the front-rear direction of the left end portion of the revolving frame 31. The swing cylinder bracket 39 is formed in a pair of upper and lower sides, and the lower swing cylinder bracket 39 is erected from the bottom plate 32 of the revolving frame 31 and has an upper end projecting inward in the horizontal direction. ing. The projecting end is integrally formed on the side wall surface of the left reinforcing rib 34. Thus, the lower swing cylinder bracket 39 is provided at a position above the bottom plate 32 of the revolving frame 31 with a predetermined gap. The upper swing cylinder bracket 39 has a shape that protrudes outward in the horizontal direction from the upper end of the left reinforcing rib 34.

  The pair of upper and lower swing cylinder brackets 39 are formed with coaxial rotation holes 39a. The base end of the swing cylinder 15a is sandwiched between a pair of upper and lower swing cylinder brackets 39, and a rotation shaft (not shown) is inserted into the rotation hole 39a, so that the base end of the swing cylinder 15a rotates. It is supported so as to be rotatable around an axis.

  Here, the gap between the lower swing cylinder bracket 39 and the bottom plate 32 of the revolving frame 31 is a piping space for routing the hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44. Further, the above-described punching hole 38 for weight reduction communicates with a position corresponding to this gap in the bottom plate 32 of the revolving frame 31. As a result, when the hydraulic tube 45 is routed along the upper surface of the bottom plate 32 of the revolving frame 31, the hydraulic tube 45 is visually recognized from the through hole 38, or the hydraulic tube 45 is grasped through the through hole 38 to swing the swing cylinder bracket. It is possible to easily perform the operation of inserting the gap in the lower portion of 39.

  The rod tip of the swing cylinder 15a is connected to the swing bracket 15 through a cylinder insertion hole 29 formed in the front side wall 32a. Here, when the swing cylinder 15a is extended, the swing bracket 15 is rotated around the vertical axis 14a so as to face rightward. Further, when the swing cylinder 15a is retracted, the swing bracket 15 rotates about the vertical axis 14a so as to face leftward.

  As described above, according to the frame structure of the construction machine 1 according to the present embodiment, the through hole 36 is formed at a position overlapping the planar portion 35b of the support bracket 35 in the bottom plate 32 of the revolving frame 31 in plan view. Thus, even when there is a portion projecting in the horizontal direction, such as the flat portion 35b of the support bracket 35, it is possible to release the mold up and down without using a core during casting. A gap as a work space can be provided between the bottom plate 32 and the flat portion 35 b of the support bracket 35. Thereby, even if the pilot tube connected to the operation lever 7 or the like is routed above the engine 40, the engine 40 placed on the flat surface portion 35b of the support bracket 35 is moved by the fastening bolt 42. Since the engine 40 can be fastened from below, the mounting workability is improved.

  As described above, the present invention is highly practical in that it can provide a frame structure for a construction machine in which a revolving frame and a support bracket can be easily integrally formed by casting without using a core. Since the effect is obtained, it is extremely useful and has high industrial applicability.

It is a side view which shows the structure of the construction machine which concerns on embodiment of this invention. It is a perspective view when an upper turning body is seen from diagonally rear. It is a perspective view which shows the structure of a turning frame. It is a top view which shows the structure of a turning frame. It is a top view when a revolving frame is seen from the lower part.

DESCRIPTION OF SYMBOLS 1 Construction machine 20 Lower traveling body 30 Upper revolving body 31 Revolving frame 32 Bottom plate 35 Support bracket 35a Standing part 35b Plane part 36 Through hole 40 Engine 45 Hydraulic tube 50 Swivel joint

Claims (3)

A frame structure of a construction machine in which an upper swing body having an engine is rotatably mounted on a lower traveling body,
A revolving frame disposed on the lower side of the upper revolving body and a support bracket for supporting the engine are integrally formed by casting,
The support bracket has an upright portion erected from the bottom plate of the revolving frame, and a flat portion that extends horizontally from the upper end portion of the erection portion and supports the engine.
A through hole is formed at a position overlapping at least the planar portion of the support bracket in a plan view on the bottom plate of the swivel frame ,
The frame structure of a construction machine, wherein the through hole is formed in such a size that the planar portion is positioned in the through hole in plan view . In claim 1,
A swivel joint that is provided at a turning center position of the turning frame and connects hydraulic tubes provided on the upper turning body and the lower traveling body;
The frame structure of a construction machine, wherein the through hole is formed so that the swivel joint can be seen from below the swivel frame. In claim 1 or 2,
The frame structure of a construction machine, wherein the through hole is formed so that the engine supported by the support bracket can be seen from below the revolving frame.

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