JP2008254520A - Supporting frame structure of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the work efficiency when fixing a screw seat member to a supporting frame. <P>SOLUTION: A slit-like cutout part 26 extending in the vertical direction is provided on a rear longitudinal plate part 25 of a left supporting frame 25 constituting a part in a penetrating manner of the rear longitudinal plate part 25B in the thickness direction. A screw seat member 27 is welded to the rear longitudinal plate part 25B of the left supporting frame 25 while the screw seat member 27 is engaged with the cutout part 26. Thus, without using any tool for positioning or the like, the screw seat member 27 is positioned in an adequate position with respect to the rear longitudinal plate part 25B, and the workability of welding the screw seat member 27 is enhanced. In this condition, the cutout part 26 is formed in a slit shape penetrating the rear longitudinal plate part 25B of the left supporting frame 25 in the thickness direction, and the screw seat member 27 is reliably fixed to the rear longitudinal plate part 25B of the small thickness. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a support frame structure for a construction machine used in, for example, a hydraulic excavator and a swing frame of a hydraulic crane.

  Generally, a hydraulic excavator that is an example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and can be raised and raised on the front side of the upper revolving body The excavation work of earth and sand etc. is performed by moving up and down the work device while turning the upper revolving body.

  Here, the revolving frame which becomes the base of the upper revolving structure is configured by assembling a bottom plate, a vertical plate, a support frame and the like. On the swivel frame, mounted devices such as a cab and an engine, a building cover, a counterweight, and the like are mounted. Further, an under cover is provided on the lower end side of the revolving frame, and the under cover prevents the stone from bouncing and colliding with a mounted device or the like when the excavator travels on rough terrain or the like (for example, Patent Documents 1 and 2).

JP 2002-302065 A JP 2002-173950 A

  Here, in the prior art according to Patent Document 1, the swivel frame includes a center frame, left and right side frames, and a plurality of overhanging beams that connect the center frame and the side frames. In this case, the extended beam has a vertical plate portion extending upward and downward, and a horizontal plate portion extending horizontally from the lower end side of the vertical plate portion, and a back nut is welded to the upper surface side of the horizontal plate portion. Has been. And it is the structure which attaches an under cover to the lower end side of an overhang | projection beam using the volt | bolt screwed to this nut.

  However, since the conventional technique according to Patent Document 1 is configured to weld a nut to the horizontal plate portion of the extended beam including the vertical plate portion and the horizontal plate portion, the extended beam is provided by the amount provided with the horizontal plate portion. There is a problem that the weight increases and the weight of the entire revolving frame increases.

  Further, in the prior art according to Patent Document 2, a bracket having an L-shaped cross section having a vertical plate portion and a horizontal plate portion is welded to the lower end side of a frame member made of a vertical plate extending upward and downward. A back nut is welded to the upper surface side of the horizontal plate portion, and an under cover is attached to the lower end side of the bracket using a bolt screwed to the nut.

  However, since the conventional technique according to Patent Document 2 is configured to weld a bracket for attaching an under cover to the lower end side of the frame member, the number of parts increases by the amount of the bracket, and the manufacturing cost of the swivel frame is also increased. There is a problem that it becomes bulky.

  Further, in the prior art according to Patent Document 1, when a nut is welded to the overhanging beam, a jig or the like is required for positioning the nut with respect to the overhanging beam. Therefore, a jig for positioning the nut is required. As described above, in the conventional techniques according to Patent Documents 1 and 2, there is a problem that workability when the nut is welded is deteriorated by positioning the nut with respect to the object to be welded using a jig or the like. .

  On the other hand, as another conventional technique, a flange extending in the horizontal direction is provided on the lower side of the rear portion of the main frame, and an arcuate groove extending in the upward and downward directions is formed on the side end portion of the flange. There has been proposed a vehicle body frame configured to weld a cylindrical mounting seat having an internal thread hole on the inner periphery side (for example, Patent Document 3).

JP 2006-176033 A

  In the prior art disclosed in Patent Document 3, a cylindrical mounting seat having a female thread formed on the inner peripheral side is fitted into a concave groove formed in the flange of the main frame, so that the mounting seat is attached to the flange of the main frame. In a state where the frame is positioned, the mounting seat can be welded to the main frame, and workability during welding can be improved.

  However, in the prior art disclosed in Patent Document 3 described above, the groove depth of the groove is ensured by forming the groove in a flange extending in the horizontal direction provided in the main frame. For this reason, there is a problem that it is difficult to form a concave groove for a frame that does not have a member that extends in the horizontal direction like this flange, that is, a member that can secure the groove depth of the concave groove. .

  Moreover, it is necessary to form the recessed groove of the prior art by patent document 3 with high precision so that the outer peripheral surface of a mounting seat may closely_contact | adhere, and there exists a problem that the manufacturing cost of the flame | frame which has this recessed groove will increase.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a support frame structure for a construction machine that can improve workability when a screw seat member is fixed to the support frame. It is said.

  In order to solve the above-described problems, a support frame structure for a construction machine according to the invention of claim 1 includes a horizontal plate portion extending horizontally in a support frame used in the construction machine, and upward and downward from the horizontal plate portion. And a slit-shaped notch that extends upward and downward in a state of penetrating the vertical plate in the thickness direction is provided on the vertical plate of the support frame. The screw seat member is fixedly provided on the support frame while being engaged with the portion.

  According to a second aspect of the present invention, the screw seat member is formed in a cylindrical shape whose inner peripheral side is a female screw hole, and the notch portion has a notch width smaller than the outer diameter dimension of the screw seat. It is in.

  According to the first aspect of the present invention, the notch extending in the upward and downward directions is provided in the vertical plate portion of the support frame, and the screw seat is engaged with the notch so that the screw seat with respect to the support frame. The member can be positioned. For this reason, for example, when fixing the screw seat member to the support frame using means such as welding, the screw seat member can be positioned at an appropriate position with respect to the support frame without using a jig or the like. Workability at the time of fixing the seat member can be improved.

  Moreover, since the notch is formed in a slit shape penetrating the vertical plate portion of the support frame in the plate thickness direction, the screw seat member can be securely fixed to the vertical plate portion having a small plate thickness. Therefore, for example, it is not necessary to provide a horizontal plate portion or the like extending in the horizontal direction on the vertical plate portion of the support frame, and thus the weight of the support frame can be reduced and the manufacturing cost can be reduced. .

  According to the invention of claim 2, the notch width of the notch portion is made smaller than the outer diameter dimension of the cylindrical screw seat member, so that the two notches on the outer peripheral surface of the screw seat member can be surely provided. It can be made to contact. For this reason, since the screw seat member is positioned in a stable state by engaging with the notch, the workability when the screw seat member is fixed to the support frame by means of welding or the like is further enhanced. Can do.

  Hereinafter, a case in which the embodiment of the support frame structure for a construction machine according to the present invention is applied to a part of a swing frame of a hydraulic excavator as a representative example will be described in detail with reference to FIGS. 1 to 12. explain.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine, and the hydraulic excavator 1 is configured as a so-called small hydraulic excavator having a total weight of 7 tons or less, for example. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and a front side of the upper revolving body 3. The operation apparatus 4 is configured to be movable.

  Here, the upper revolving unit 3 has a later-described revolving frame 15 serving as a base. On the revolving frame 15, a later-described cab 5, a counterweight 6, an engine 7, an engine cover 10, and the like are provided. .

  Reference numeral 5 denotes a cab disposed on the left side of the front portion of the revolving frame 15, and the cab 5 defines a driver's cab in which an operator is boarded. Inside the cab 5 are disposed a driver's seat where an operator is seated, various operation levers (not shown) operated by the operator, and the like.

  Reference numeral 6 denotes a counterweight provided on the rear end side of the revolving frame 15, and the counterweight 6 is mounted on weight mounting portions 18B and 19B of left and right vertical plates 18 and 19, which will be described later. The counterweight 6 balances the weight of the entire upper swing body 3 with respect to the work device 4.

  Reference numeral 7 denotes an engine mounted on the revolving frame 15 at the front side of the counterweight 6. The engine 7 is placed in a horizontal state extending left and right on the left and right vertical plates 18 and 19. It is supported. A cooling fan 7A for supplying cooling air to a heat exchange device 9 (described later) is provided on the left side of the engine 7, and a hydraulic pump 8 (described later) is attached on the right side of the engine 7.

  A hydraulic pump 8 is attached to the right side of the engine 7, and the hydraulic pump 8 is driven by the engine 7. The hydraulic pump 8 discharges pressure oil for operation toward various hydraulic actuators provided in the lower traveling body 2, the upper swing body 3, and the work device 4.

  9 is a heat exchange device provided on the left side of the engine 7 so as to face the cooling fan 7A. The heat exchange device 9 includes, for example, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, and a turbocharger It is comprised by the intercooler etc. which cool the air compressed by (not shown).

  An engine cover 10 covers the engine 7 and the like from above. The engine cover 10 extends between the cab 5 and a hydraulic oil tank 13 (described later) and the counterweight 6 in the left and right directions, and is disposed on the front side of the counterweight 6. The engine 7, the hydraulic pump 8, the heat exchange device 9, and the like provided are covered from above.

  A left side cover 11 is provided between the cab 5 and the left end portion of the counterweight 6 so as to be openable and closable. The left side cover 11 covers the heat exchange device 9 and the like from the left side. Reference numeral 12 denotes a right side cover provided between a fuel tank 14 (to be described later) and the right end of the counterweight 6, and the right side cover 12 covers the engine 7, the hydraulic pump 8, and the like from the right side.

  Reference numeral 13 denotes a hydraulic oil tank disposed on the right side of the front portion of the revolving frame 15. The hydraulic oil tank 13 stores hydraulic oil supplied to various hydraulic actuators mounted on the hydraulic excavator 1. A fuel tank 14 is disposed on the front side of the hydraulic oil tank 13, and the fuel tank 14 stores fuel supplied to the engine 7.

  Reference numeral 15 denotes a revolving frame that serves as a base of the upper revolving structure 3. The revolving frame 15 includes a center frame 16, a left side frame 20, a right side frame 21, and a front frame member, which will be described later, as shown in FIGS. 23, a left support frame 25, a left rear bracket 28, right support frames 33 and 34, a right rear bracket 35, and the like.

  Reference numeral 16 denotes a center frame that constitutes the central portion of the revolving frame 15. The center frame 16 is formed in a flat plate shape using a thick steel plate or the like, and has a bottom plate 17 that extends forward and rearward, and an upper surface of the bottom plate 17. It is generally constituted by a left vertical plate 18 and a right vertical plate 19 which are erected on the side by means of welding or the like and extend frontward and rearward on the bottom plate 17 while facing left and right.

  Here, the front sides of the left and right vertical plates 18 and 19 are boom brackets 18A and 19, and the left and right boom brackets 18A and 19A can be lifted up and down on the base end side of the working device 4 (boom). It is the structure which supports to. Further, the rear side of the left and right vertical plates 18 and 19 are weight mounting portions 18B and 19B having an I-shaped cross section (I flange structure), and on these left and right weight mounting portions 18B and 19B. A counterweight 6 is attached.

  Reference numeral 20 denotes a left side frame arranged on the left side of the center frame 16 with a gap, and 21 denotes a right side frame arranged on the right side of the center frame 16 with a gap. These left and right side frames 20, 21 have a cross section D, for example. It is formed using a D-shaped frame having a letter shape, and extends forward and rearward along the center frame 16.

  The left side frame 20 is connected to the center frame 16 through a front frame member 23, a left support frame 25, a left rear bracket 28, and the like, which will be described later, and the right side frame 21 is connected to right support frames 33, 34, which will be described later. It is configured to be connected to the center frame 16 via the right rear bracket 35 or the like.

  Reference numeral 22 denotes a vertical beam member provided at the left front portion of the center frame 16, and the vertical beam member 22 is fixed to the front side of the bottom plate 17 and the left vertical plate 18 by means of welding or the like. And the front-end part of the vertical beam member 22 protrudes ahead from the baseplate 17, and becomes the structure to which the below-mentioned front frame member 23 is joined.

  23 is a front frame member provided at the left front portion of the revolving frame 15, and the front frame member 23 is joined to the front end portion of the left side frame 20 and the front end portion of the vertical beam member 22, thereby Connected. Here, circular mount mounting holes 23A, 23A are provided on both left and right ends of the front frame member 23, and the front frame member 23 is attached to each mount mounting hole 23A. It is the structure which supports the front part side of the cab 5 via this.

  Reference numeral 24 denotes a connecting plate that is located on the rear side of the front frame member 23 and is provided between the bottom plate 17 of the center frame 16 and the left side frame 20. The connecting plate 24 is connected to the bottom plate 17 and the left side frame 20. It is what connects them.

  A left support frame 25 is a part of a support frame structure provided between the center frame 16 and the left side frame 20, and the left support frame 25 is disposed on the rear side of the front frame member 23. . The left support frame 25 has one end side (right end side) in the left and right directions joined to the bottom plate 17 and the left vertical plate 18 of the center frame 16, and the other end side (left end side) in the left and right directions is left. By joining to the side frame 20, the center frame 16 and the left side frame 20 are connected. The left support frame 25 supports the cab 5 in cooperation with the front frame member 23.

  Here, as shown in FIG. 5 and FIG. 8 and the like, the left support frame 25 is formed using a steel plate material or the like, and has a flat horizontal plate portion 25A extending in the left and right directions, and the rear of the horizontal plate portion 25A. A rear vertical plate portion 25B extending upward and downward by bending the end side downward, and a left front vertical plate portion 25C extending downward and upward by bending the left front end side of the horizontal plate portion 25A downward. And a right front vertical plate portion 25D extending upward and downward by bending the right front end side of the horizontal plate portion 25A downward.

  A circular mount attachment hole 25E is provided in each of the left front portion and the right front portion of the horizontal plate portion 25A constituting the left support frame 25, and the left support frame 25 is attached to each mount attachment hole 25E. It is the structure which supports the rear side of the cab 5 via (not shown). The rear support plate 25B of the left support frame 25 is provided with a plurality of notches 26 described later.

  26, 26,... Are a plurality of (for example, four) cutout portions provided in the rear vertical plate portion 25B of the left support frame 25. Each cutout portion 26 extends a screw seat member 27 described later in the vertical direction. The screw seat member 27 is engaged when welding to the lower end side of the plate portion 25B. Here, as shown in FIGS. 6 to 8, each notch 26 penetrates the rear vertical plate portion 25B in the thickness direction and extends upward from the lower end portion 25F of the rear vertical plate portion 25B. And is a through hole surrounded by left and right side end portions 26A and 26A and an upper end portion 26B which are opposed to each other at a constant interval. Each of the cutouts 26 is formed by cutting out a preset position when cutting out the material of the left support frame 25 from the steel plate material using, for example, laser cutting or the like. is there.

  In this case, as shown in FIGS. 7 and 11, the notch width (the distance between the left and right side end portions 26A) A of the notch 26 is based on the outer diameter D of the screw seat member 27 described later. Is also set small (A <D). Further, as shown in FIGS. 6 and 9, the notch length of the notch portion 26 (the length dimension from the lower end portion 25F of the rear vertical plate portion 25B to the upper end portion 26B of the notch portion 26) B is a screw. It is set substantially equal to the length dimension H of the seat member 27 (B≈H).

  27, 27,... Are a plurality of (for example, four) screw seat members fixed to the rear vertical plate portion 25B of the left support frame 25, and each screw seat member 27 is supported together with the left support frame 25. This constitutes a frame structure. The screw seat member 27 is fixed by welding in a state of being engaged with the notch portion 26 of the left support frame 25, and a bolt 31 for attaching an under cover 30 described later is screwed therein. Here, as shown in FIGS. 6 to 8, the screw seat member 27 is formed as a cylindrical body whose inner peripheral side is a female screw hole 27A, and its outer diameter dimension D is larger than the notch width A of the notch 26. The length dimension H from the upper end surface 27B to the lower end surface 27C is set substantially equal to the notch length B of the notch 26.

  The screw seat member 27 is brought into contact with the left and right side end portions 26A of the cutout portion 26 at two locations on the outer peripheral surface, thereby causing the left and right sides of the left support frame 25 to move to the left and right. Is positioned in the direction (horizontal direction), and the lower end surface 27C is disposed substantially flush with the lower end portion 25F of the rear vertical plate portion 25B by bringing the upper end surface 27B into contact with the upper end portion 26B of the notch 26. Positions upward and downward. In this state, the screw seat member 27 is fixed to the rear vertical plate portion 25B of the left support frame 25 by welding the contact portion between the outer peripheral surface of the screw seat member 27 and each side end portion 26A of the notch portion 26. Has been.

  A left rear bracket 28 is provided between the center frame 16 and the rear end side of the left side frame 20, and the left rear bracket 28 connects the left vertical plate 18 and the rear end side of the left side frame 20. Is. Here, as shown in FIGS. 5 and 6, the left rear bracket 28 includes a vertical plate portion 28 </ b> A extending upward and downward, and a horizontal plate extending horizontally from the lower end side of the vertical plate portion 28 </ b> A toward the front. A back nut 28C to which a bolt 32 described later is screwed is welded to the upper surface side of the horizontal plate portion 28B.

  Reference numeral 29 denotes a support plate provided between the left support frame 25 and the left rear bracket 28. The front end of the support plate 29 is joined to the rear vertical plate portion 25B of the left support frame 25, and the rear end is the left rear. The bracket 28 is joined to the vertical plate portion 28A. The support plate 29 supports the heat exchange device 9.

  Reference numeral 30 denotes a left rear under cover provided on the lower end side of the left support frame 25 and the left rear bracket 28 located below the support plate 29. The under cover 30 is a rectangular shape extending in the front and rear directions. The heat exchange device 9 and the like that are formed in a flat plate shape and supported on the support plate 29 are covered from below.

  As shown in FIGS. 5 and 6, the front end side of the under cover 30 is provided at the lower end of the left support frame 25 (rear vertical plate portion 25 </ b> B) with a bolt 31 screwed into the female screw hole 27 </ b> A of the screw seat member 27. The rear end side of the under cover 30 is attached to the lower end portion of the left rear bracket 28 by a bolt 32 screwed into the back nut 28C of the left rear bracket 28.

  Reference numerals 33 and 34 denote front and rear right support frames provided between the right vertical plate 19 and the right side frame 21 of the center frame 16, and each of the right support frames 33 and 34 includes the bottom plate 17 and the right vertical plate 19. And the right side frame 21 are connected.

  Reference numeral 35 denotes a right rear bracket provided between the center frame 16 and the rear end side of the right side frame 21. The right rear bracket 35 connects the right vertical plate 19 and the rear end side of the right side frame 21. Is.

  36 is a left front under cover provided between the front frame member 23 and the connecting plate 24, and 37 is a left center under cover provided between the connecting plate 24 and the left support frame 25. The under covers 36 and 37 cover the cab 5 and the like from below. Reference numeral 38 denotes a right rear under cover provided between the right support frame 34 and the right rear bracket 35. The under cover 38 covers the engine 7, the hydraulic pump 8, and the like from below. Further, 39 is an under cover on the center rear side provided on the rear side of the bottom plate 17 of the center frame 16, and the under cover 39 covers the engine 7 and the like from below.

  Reference numeral 40 denotes a floor plate located on the left side of the under cover 30 and provided between the left support frame 25 and the left rear bracket 28. The floor plate 40 includes the left side frame 20, the left support frame 25, and the left rear bracket. It is fixed to 28 using means such as welding. And the floor board 39 forms the floor surface of the utility room which accommodates the grease gun for grease supply, a tool box, etc. (not shown), for example.

  The support frame structure constituting a part of the revolving frame 15 according to the present embodiment includes the left support frame 25 and the screw seat member 27 as described above. The operation of welding the above will be described with reference to FIGS.

  First, as shown in FIG. 9, for example, the rear vertical plate portion 25B of the left support frame 25 is placed on the work table 41, and a cylindrical screw is inserted into the notch portion 26 formed in the rear vertical plate portion 25B. The seat member 27 is engaged.

  In this case, the notch width A of the notch portion 26 is set to be smaller than the outer diameter D of the screw seat member 27, and the notch length B of the notch portion 26 is equal to the length dimension H of the screw seat member 27. Is set to be approximately equal. For this reason, as shown in FIGS. 10 and 11, the screw seat member 27 has two locations on the outer peripheral surface abutting the left and right side end portions 26 </ b> A of the notch portion 26, thereby By positioning the upper end surface 27B in contact with the upper end portion 26B of the notch 26, the lower end surface 27C is substantially the same as the lower end portion 25F of the rear vertical plate portion 25B. Positioned in the same plane.

  Thus, the screw seat member 27 is stabilized with respect to the left support frame 25 by engaging the screw seat member 27 with the notch 26 formed in the rear vertical plate portion 25B of the left support frame 25. Then, as shown in FIG. 12, a screw seat is used by welding the contact portion between the outer peripheral surface of the screw seat member 27 and each side end portion 26A of the notch portion 26 using a welding rod 42 or the like. The member 27 can be fixed to the rear vertical plate portion 25B of the left support frame 25.

  Thus, according to the present embodiment, the slit-shaped notch 26 extending upward and downward with the rear vertical plate portion 25B penetrating the rear vertical plate portion 25B of the left support frame 25 in the thickness direction. When the screw seat member 27 is welded to the rear vertical plate portion 25B of the left support frame 25, the screw seat member 27 is engaged with the notch portion 26.

  Thereby, since the screw seat member 27 can be positioned at an appropriate position with respect to the rear vertical plate portion 25B without using a positioning jig or the like, workability when welding the screw seat member 27 is improved. Can be increased.

  In this case, the notch portion 26 is formed in a slit shape penetrating the rear vertical plate portion 25B of the left support frame 25 in the thickness direction, so that the rear vertical plate portion 25B of the left support frame 25 having a small thickness is also formed. The screw seat member 27 can be securely fixed. Therefore, it is not necessary to provide a horizontal plate portion extending horizontally in the rear vertical plate portion 25B of the left support frame 25, the weight of the left support frame 25 can be reduced, and the manufacturing cost of the revolving frame 15 can be reduced. Can also contribute.

  Further, since the notch width A of the notch portion 26 is set to be smaller than the outer diameter D of the screw seat member 27, two locations on the outer peripheral surface of the screw seat member 27 are located on the left and right sides of the notch portion 26. The side end portion 26A can be reliably brought into contact. For this reason, the screw seat member 27 is positioned in a stable state in the left and right directions with respect to the rear vertical plate portion 25B of the left support frame 25 by engaging with the notch portion 26. Workability when welding 27 to the rear vertical plate portion 25B of the left support frame 25 can be further enhanced.

  Further, the notch length of the notch part 26 (the length dimension from the lower end part 25F of the rear vertical plate part 25B to the upper end part 26B of the notch part 26) B is substantially equal to the length dimension H of the screw seat member 27. Since they are set equal, the lower end surface 27C of the screw seat member 27 is substantially the same as the lower end portion 25F of the rear vertical plate portion 25B by bringing the upper end surface 27B of the screw seat member 27 into contact with the upper end portion 26B of the notch portion 26. It can be positioned in the up and down direction while being placed on a flat surface.

  Thereby, when the under cover 30 is attached to the rear vertical plate portion 25B of the left support frame 25 by the bolt 31 screwed to the screw seat member 27, the gap between the lower end portion 25F of the rear vertical plate portion 25B and the under cover 30 is set. It is possible to suppress the occurrence of a gap in the surface.

  In the above-described embodiment, the case where the under cover 30 is attached using the screw seat member 27 fixed to the rear vertical plate portion 25B of the left support frame 25 is illustrated. However, the present invention is not limited to this. For example, a hose clamp for holding a hydraulic hose, a battery attachment, a valve attachment, and the like may be attached using the screw seat member 27.

  Further, in the above-described embodiment, the notch 26 is formed in the rear vertical plate portion 25B of the left support frame 25 constituting a part of the turning frame 15, and the screw seat member 27 is engaged with the notch 26. In this example, the welding is performed. However, the present invention is not limited to this. For example, the left rear bracket 28 constituting a part of the turning frame 15 is used as a support frame, and a notch is formed in the vertical plate portion 28A of the left rear bracket 28. The screw seat member may be engaged with the notch and welded.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is a top view which shows a hydraulic shovel. It is a top view which shows the turning frame of a hydraulic shovel alone. It is a bottom view which shows a revolving frame from the lower side in the state which attached | subjected the mesh | network to the undercover. FIG. 4 is an enlarged plan view in which a left support frame, an under cover and the like in FIG. 3 are enlarged. It is sectional drawing which looked at the left support frame, the notch part, the screw seat member, the under cover, etc. from the arrow VI-VI direction in FIG. It is sectional drawing which looked at a notch part, a screw seat member, etc. from the arrow VII-VII direction in FIG. It is a disassembled perspective view which shows a left support frame, a notch part, a screw seat member, an undercover. It is sectional drawing which shows the state which engages a screw seat member with the notch part of a left support frame. It is sectional drawing which shows the state which positioned the screw seat member by the notch part. It is sectional drawing which looked at a notch part and a screw seat member from the arrow XI-XI direction in FIG. It is sectional drawing which shows the state which welds the positioned screw seat member to the left support frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper revolving body 15 Revolving frame 16 Center frame 20 Left side frame 21 Right side frame 25 Left support frame (support frame structure)
25A Horizontal plate portion 25B Rear vertical plate portion 26 Notch portion 27 Screw seat member (support frame structure)
27A Female screw hole 30, 36, 37, 38, 39 Under cover 31, 32 Bolt 33, 34 Right support frame

Claims (2)

The supporting frame used for the construction machine is composed of a horizontal plate portion extending in the horizontal direction and a vertical plate portion extending upward and downward from the horizontal plate portion,
The vertical plate portion of the support frame is provided with a slit-shaped notch that extends upward and downward while penetrating the vertical plate portion in the thickness direction.
A support frame structure for a construction machine, wherein the screw seat member is fixedly provided on the support frame in a state of being engaged with the notch.   2. The construction machine according to claim 1, wherein the screw seat member is formed in a cylindrical shape whose inner peripheral side is a female screw hole, and the notch portion has a notch width smaller than an outer diameter of the screw seat. Support frame structure.

Images