JP2018053531A - Small hydraulic excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small hydraulic excavator having an article storage space by effectively utilizing the dead space in the corner guard device.SOLUTION: A small hydraulic excavator includes a revolving frame 11 commonly used for canopy specification and cab specification, and a corner guard device 25 for protecting a left front corner A of a cab type cab unit 13 attached to a left front outer periphery of the revolving frame 11. The corner guard device 25 includes a corner guard frame 28 having an outer frame 30 and a bottom plate 31, a corner guard cover 29 mounted on the outer frame 30, an article storage space portion 33 formed between the left front outer periphery of the revolving frame 11 and the bottom plate 31 of the corner guard frame 28 and the corner guard cover 29, an opening 48 formed in the corner guard cover 29 for taking in and discharging the article from the article storage space portion 33, and an opening and closing door 49 for opening and closing the opening 48.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a cab specification small hydraulic excavator, and in particular, to protect a swivel frame commonly used in the canopy specification and the cab specification, and a left front outer periphery of the swivel frame in order to protect a left front corner portion of a cab type cab unit. The present invention relates to a small hydraulic excavator provided with a corner guard device attached to a section.

  A small excavator such as a mini excavator includes a lower traveling body, an upper revolving body that is turnable on the upper side of the lower traveling body, and a multi-indirect working device connected to the front side of the upper revolving body. Yes. The upper revolving structure includes a revolving frame that forms a foundation structure, and a cab unit provided on the front left side of the revolving frame. The driving unit includes a canopy type having a canopy that covers the upper side of the driver's seat and a cab type having a cab box that covers the periphery of the driver's seat.

  A small hydraulic excavator is often used for work in a narrow alley about the vehicle width of the lower traveling body, and is suitable for such work, and what is called a rear small turning type or a very small turning type is used. Are known. The small hydraulic excavator of the small rear turning type or the ultra small turning type is configured such that the virtual circle of the turning radius defined by the rear end of the upper turning body (specifically, the rear surface of the counterweight) is within the vehicle width of the lower traveling body. It is configured. This prevents the rear end of the upper swing body from interfering with surrounding buildings or plants when the upper swing body is turned. The ultra-small turning type small excavator is further configured so that a virtual circle of the turning radius defined by the working device fits in the vehicle width of the lower traveling body when the working device is in a posture with the minimum turning radius. ing. Thus, when the upper swing body is turned, not only the rear end of the upper swing body but also the working device on the front side of the upper swing body is prevented from interfering with surrounding buildings and trees.

  Although the canopy type cab unit fits within the virtual circle of the turning radius defined by the rear end of the upper swing body, the cab type cab unit is difficult to fit within the virtual circle described above, and its left front corner The part protrudes. Therefore, in general, separate swivel frames are prepared for the canopy specification and the cab specification.

  On the other hand, from the viewpoint of reducing manufacturing costs, it has been proposed to use a common rotating frame for the canopy specification and the cab specification (see, for example, Patent Document 1). In the canopy specification small hydraulic excavator described in Patent Document 1, a common turning frame (common frame) is used for the canopy specification and the cab specification. On the other hand, a small cab-type hydraulic excavator uses a common swivel frame and protrudes radially outward from the left front corner of the cab unit to protect the left front corner of the cab unit. Attach the corner guard device to the left front outer periphery of the swivel frame. The corner guard device includes a corner guard frame (guard member) attached to the left front outer periphery of the revolving frame, a corner guard cover extending along an upper portion of the outer periphery of the corner guard frame and a part of the outer periphery of the revolving frame. It has.

JP 2006-200312 A

  By the way, in the hydraulic excavator, it is preferable to secure an article storage space for storing articles such as tools and accessories. However, in the above-described small hydraulic excavator of the rear small turning type or the ultra small turning type, since the space in the upper turning body is limited, it is difficult to secure an article storage space. Therefore, the inventors of the present application have paid attention to the fact that a dead space is generated inside the corner guard device described above in a cab-spec hydraulic excavator.

  The present invention has been made in view of the above circumstances, and the object thereof is to secure an article storage space by effectively utilizing a dead space in a corner guard device even in an upper-part turning body in which space is limited. It is to provide a small hydraulic excavator that can be used.

  In order to achieve the above object, the present invention includes a lower traveling body, an upper swinging body provided on the upper side of the lower traveling body, and a working device connected to the upper swinging body, The upper swing body is a swing frame commonly used in the canopy specification and the cab specification, a fuel tank and a hydraulic oil tank disposed on the front right side of the swing frame, a floor plate portion disposed on the front left side of the swing frame, A cab-type cab unit having a pedestal part and a driver's seat placed on an upper plate of the pedestal part, a counterweight disposed at a rear end part of the revolving frame and having an arcuate rear surface, and the swivel An engine room which is formed on the rear side of the frame, on the front side of the counterweight and below the upper surface plate of the pedestal, and on which a plurality of devices including an engine and a hydraulic pump are mounted; The upper turning body is configured such that a virtual circle having a turning radius defined by a rear surface of the counterweight is within a vehicle width of the lower traveling body, and the left front corner portion of the cab unit is The upper turning body protrudes from the virtual circle so that the upper turning body protrudes radially outward of the turning radius from the left front corner portion of the cab unit in order to protect the left front corner portion of the cab unit. In the small hydraulic excavator further provided with a corner guard device attached to the left front outer peripheral portion of the turning frame, the corner guard device protrudes radially outward of the turning radius from the left front corner portion of the cab unit. And a bottom plate provided on the inner side of the L-shaped outer frame and formed along the left front outer peripheral portion of the swivel frame. A corner guard frame attached to the left front outer periphery of the turning frame, a corner guard cover attached to be positioned on the L-shaped outer frame of the corner guard frame, and the left front outer periphery of the turning frame. An article storage space part formed between the part and the bottom plate of the corner guard frame and the corner guard cover, an opening formed in the corner guard cover for taking in and out articles from the article storage space part, and the opening And an opening / closing door for opening and closing the part.

  ADVANTAGE OF THE INVENTION According to this invention, even if it exists in the upper turning body with which space is restrict | limited, the article storage space can be ensured by utilizing effectively the dead space in a corner guard apparatus.

It is a side view showing the structure of the cab specification small hydraulic excavator in the 1st Embodiment of this invention. It is a top view showing the structure of the cab specification small hydraulic excavator in the 1st Embodiment of this invention. It is a top view showing the structure of a turning frame and a corner guard frame in the 1st embodiment of the present invention, and showing equipment layout. It is a perspective view showing the principal part structure of the cab unit in the 1st Embodiment of this invention. It is a side view showing the structure of the small hydraulic shovel of the canopy specification in a reference example. It is a top view showing the structure of the small hydraulic shovel of the canopy specification in a reference example. It is a perspective view showing the structure of the corner guard frame and the upper mounting bracket in the first embodiment of the present invention and the article storage space. It is a bottom view showing the structure of the corner guard frame and the lower mounting bracket in the first embodiment of the present invention. It is a disassembled perspective view showing the structure of the corner guard frame, the upper mounting bracket, and the lower mounting bracket in the first embodiment of the present invention. It is a perspective view showing the internal structure of the corner guard apparatus in the 1st Embodiment of this invention. It is a perspective view showing the structure of the corner guard cover in the 1st Embodiment of this invention. It is a perspective view showing the structure of the left front corner part of the upper turning body in the 2nd Embodiment of this invention. It is a disassembled perspective view showing the structure of the left front corner part of the upper turning body in the 2nd Embodiment of this invention. It is the perspective view seen from the inside showing the internal structure of the corner guard apparatus in the 2nd Embodiment of this invention. It is the perspective view seen from the outer side showing the internal structure of the corner guard apparatus in the 2nd Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side view showing the structure of a cab-type compact hydraulic excavator in the present embodiment, and FIG. 2 is a top view (however, the working device is not shown for convenience). FIG. 3 is a top view showing the structure of the turning frame and the corner guard frame in the present embodiment and the equipment layout. FIG. 4 is a perspective view showing the main structure of the cab unit in the present embodiment. 1, the front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (front side toward the paper surface in FIG. 1) of the driver seated in the driver's seat in the state shown in FIG. ), And the right side (the back side in FIG. 1) are simply referred to as the front side, the rear side, the left side, and the right side.

  The small hydraulic excavator of this embodiment includes a crawler-type lower traveling body 1 and an upper revolving body 2 that is turnable on the upper side of the lower traveling body 1. Constitutes the car body. And the lower traveling body 1 travels by the rotational drive of the traveling motor (not shown). In addition, the upper swing body 2 is swung by rotation driving of a swing motor (not shown).

  A work device 4 is connected to the front side of the upper swing body 2 via a swing post 3. The swing post 3 is connected to the front side of the upper swing body 2 so as to be rotatable in the left-right direction. The swing post 3 is rotated in the left-right direction by extension and contraction drive of a swing cylinder (not shown), and the work device 4 is rotated in the left-right direction.

  The work device 4 includes a boom 5 that is connected to the swing post 3 so as to be rotatable in the vertical direction, an arm 6 that is connected to the boom 5 so as to be rotatable in the vertical direction, and an arm 6 that is rotatable in the vertical direction. The bucket 7 (working tool) connected is provided. The boom 5, the arm 6, and the bucket 7 are rotated in the vertical direction by the expansion and contraction drive of the boom cylinder 8, the arm cylinder 9, and the bucket cylinder 10 (work implement cylinder).

  The upper swing body 2 is a swing frame 11 that forms a foundation structure, a counterweight 12 that is disposed at the rear end of the swing frame 11 and has an arcuate rear surface, and a cab type that is disposed on the front left side of the swing frame 11. Cab unit 13 and an exterior cover (in detail, a plurality of covers including a corner guard cover described later) covering a portion other than the cab unit 13.

  The driver's cab unit 13 includes a floor member 14 (see FIG. 4), a driver seat 15 (see FIG. 1) that is provided at a rear portion of the floor member 14, and a cab box that covers the periphery of the driver seat 15. 16 (see FIGS. 1 and 4). Further, a cross operation type operation device for instructing driving of the boom cylinder 8 and the bucket cylinder 10, a cross operation type operation operation device for instructing driving of the arm cylinder 9 and driving of the swing motor, and swing A swing operation device for instructing driving of the cylinder and a travel operation device for instructing driving of the travel motor are also provided.

  The floor member 14 includes a floor plate portion 17 serving as a scaffold for the driver, and a pedestal portion 18 raised to the rear side of the floor plate portion 17. The pedestal portion 18 includes a front plate 18a raised from the rear portion of the floor plate portion 17, a top plate 18b extending rearward from the upper portion of the front plate 18a, and a back plate 18c raised from the rear portion of the upper plate 18b. have. The driver seat 15 is placed on the upper surface plate 18 b of the pedestal portion 18.

  An engine room 19 is formed on the rear side of the swivel frame 11 (specifically, on the front side of the counterweight 12 and below the upper surface plate 18b of the pedestal 18) (see FIG. 1). The engine 20 is mounted in a horizontal state. A hydraulic pump (not shown) is provided on the left side of the engine 20 in the engine room 19.

  A heat exchanger 21 such as a radiator or an oil cooler is provided on the right side of the engine 20. A fuel tank 22 that stores the fuel of the engine 20 and a hydraulic oil tank 23 that stores the hydraulic oil are provided on the front right side of the revolving frame 11 (in other words, the front side of the heat exchanger described above).

  The small hydraulic excavator of this embodiment is a so-called rear small turning type. That is, the upper turning body 2 is such that the virtual circle C of the turning radius R is within the vehicle width of the lower traveling body 1 when the turning radius from the turning center O of the upper turning body 2 to the rear surface of the counterweight 12 is R. It is configured. In addition, most of the upper swing body 2 is configured to fit within a virtual circle C having a swing radius R. However, the left front corner portion A of the cab type cab unit 13 protrudes from the virtual circle C having the turning radius R. As in the reference examples shown in FIGS. 5 and 6, in a canopy-type hydraulic excavator, the entire canopy-type cab unit 100 fits within a virtual circle C having a turning radius R.

  The swivel frame 11 can be used in common for the cab specification and the canopy specification. That is, most of the swivel frame 11 (specifically, a portion other than the bracket 24 that rotatably supports the swing post 3) is configured to fit within a virtual circle C having a swivel radius R. In order to protect the left front corner portion A of the cab type cab unit 13, a corner guard device 25 is attached to the left front outer peripheral portion of the turning frame 11.

  The corner guard device 25 is attached to the turning frame 11 and the corner guard frame 28 attached to the left front outer peripheral portion of the turning frame 11 by using a lower attachment fitting 26 and an upper attachment fitting 27 described later. And a corner guard cover 29 extending along a part of the outer periphery of the revolving frame 11. The corner guard frame 28 protrudes outward in the radial direction of the turning radius from the left front corner portion A of the cab unit 13. Prior to the left front corner portion A of the cab unit 13, the corner guard frame 28 collides with the obstacle, thereby protecting the cab unit 13 from the obstacle.

  Next, details of the corner guard device 25 of the present embodiment will be described.

  FIG. 7 is a perspective view showing the article storage space portion together with the structure of the corner guard frame 28 and the upper mounting bracket 27 in the present embodiment. FIG. 8 is a bottom view showing the structure of the corner guard frame 28 and the lower mounting bracket 26 in the present embodiment. FIG. 9 is an exploded perspective view showing the structure of the corner guard frame 28, the upper mounting bracket 27, and the lower mounting bracket 26 in the present embodiment. FIG. 10 is a perspective view showing the internal structure of the corner guard device 25 in the present embodiment. FIG. 11 is a perspective view showing the structure of the corner guard cover 29 in the present embodiment. 7 and 9, the box is not shown for convenience. 7 and 10, for the sake of convenience, the corner guard cover 29 is indicated by a two-dot chain line, and the open / close door is not illustrated.

  The corner guard frame 28 includes an L-shaped outer frame 30 and a bottom plate 31 provided inside the outer frame 30 and formed along the left front outer peripheral portion of the turning frame 11. The outer frame 30 of the corner guard frame 28 is formed of, for example, a cylindrical body having a D-shaped cross section, like the outer frame of the turning frame 11. The bottom plate 31 of the corner guard frame 28 is provided with two bosses 32 having through holes 32a. Further, a notch 32b is formed in the bottom plate 31 of the corner guard frame 28 as shown in the drawing. The corner guard cover 29 is attached to the turning frame 11 so as to be positioned on the outer frame 30 of the corner guard frame 28.

  An article storage space 33 is formed between the left front outer periphery of the turning frame 11, the bottom plate 31 of the corner guard frame 28, and the corner guard cover 29. In the article storage space section 33 (specifically, the bottom plate 31), a box 34 for storing articles such as tools and accessories is disposed. Two through holes corresponding to the two through holes 32 a of the corner guard frame 28 are formed in the bottom surface of the box 34.

  The lower mounting bracket 26 is connected to the horizontal plates 35 and 36 so that there is a step in the vertical direction between the horizontal plates 35 and 36 (in other words, to avoid the outer frame of the revolving frame 11). And a connecting plate 37 to be connected. Two through holes 38 corresponding to the two through holes 32 a of the corner guard frame 28 are formed in the horizontal plate 35. Two through holes 39 are formed in the horizontal plate 36.

  The upper mounting bracket 27 includes a horizontal plate 40 and a vertical plate 41. The horizontal plate 40 is formed with two through holes 42 corresponding to the two through holes 32a of the corner guard frame 28, respectively. The vertical plate 41 is formed with one through hole (not shown), and one nut 43 is welded at the same position as the through hole.

  Bolts 44 are inserted in that order into the through holes 38 of the lower mounting bracket 26, the through holes 32a of the corner guard frame 28, the through holes 42 of the upper mounting bracket 27, and the through holes of the box 34. A nut 45 is screwed to the front end side of. Thereby, the corner guard frame 28, the box 34, the lower mounting bracket 26, and the upper mounting bracket 27 are integrated.

  A bolt 46 is inserted into the through hole 39 of the lower mounting bracket 26, and the tip end side of the bolt 46 is screwed into the screw hole of the bottom plate of the turning frame 11. A bolt 47 is inserted into a through hole in the vertical plate of the revolving frame 11 and a through hole in the vertical plate 41 of the upper mounting bracket 27, and the tip end side of the bolt 47 is screwed into the nut 43. Thereby, the corner guard frame 28 and the box 34 are attached to the revolving frame 11.

  The corner guard cover 29 is formed with an opening 48 for taking in and out articles from the box 34 in the article storage space 33, and an opening / closing door 49 for opening and closing the opening 48 is provided. The opening / closing door 49 is provided so as to be rotatable in the vertical direction by a hinge 50 provided at the lower edge of the opening 48. A lock device 51 is provided at the upper end of the opening / closing door 49. The locking device 51 can be engaged with the upper edge portion of the opening 48 depending on the rotational operation position, and thereby the closed state of the open / close door 49 can be locked.

  In the present embodiment configured as described above, the article storage space can be secured by effectively utilizing the dead space in the corner guard device 25.

  A second embodiment of the present invention will be described. Note that in this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  FIG. 12 is a perspective view showing the structure of the left front corner portion of the upper swing body in the present embodiment, and FIG. 13 is an exploded perspective view. FIG. 14 is a perspective view showing the internal structure of the corner guard device in the present embodiment as seen from the inside, and FIG. 15 is a perspective view seen from the outside. In FIG. 15, the bottom surface portion of the corner guard cover is indicated by a solid line, but for convenience, the side surface portion of the corner guard cover is indicated by a two-dot chain line and the opening / closing door is not illustrated.

  In the present embodiment, the revolving frame cover 52 that extends along the left front outer periphery of the revolving frame 11 is attached to the revolving frame 11.

  The corner guard device 25A includes a corner guard frame 28 attached to the left front outer peripheral portion of the turning frame 11 and a corner guard cover 29A disposed on the corner guard frame 28 using the lower mounting bracket 26 and the upper mounting bracket 27A. It has. The corner guard cover 29 </ b> A has a side surface portion 53 disposed so as to be positioned on the outer frame 30 of the corner guard frame 28, and a bottom surface portion 54 positioned above the bottom plate 31 of the corner guard frame 28. The vertical plate 41A of the upper mounting bracket 27A is smaller than the vertical plate 41 of the upper mounting bracket 27 of the first embodiment in order to avoid interference with the turning frame cover 52.

  Two through holes respectively corresponding to the two through holes 32a of the corner guard frame 28 are formed in the bottom surface portion 54 of the corner guard cover 29A. Then, the bolts 44 are inserted in that order into the through hole 38 of the lower mounting bracket 26, the through hole 32a of the corner guard frame 28, the through hole of the bottom surface portion 54 of the corner guard cover 29A, and the through hole 42 of the upper mounting bracket 27A. A nut 45 is screwed onto the front end side of the bolt 44. Thereby, the corner guard frame 28, the corner guard cover 29A, the lower mounting bracket 26, and the upper mounting bracket 27A are integrated.

  As in the first embodiment, the bolt 46 is inserted into the through hole 39 of the lower mounting bracket 26, and the tip end side of the bolt 46 is screwed into the screw hole of the bottom plate of the revolving frame 11. Further, a bolt 47 is inserted into a through hole of the vertical plate of the turning frame 11 and a through hole of the vertical plate 41A of the upper mounting bracket 27A, and a tip end side of the bolt 47 is screwed into the nut 43. Thereby, the corner guard frame 28 and the bottom surface portion 54 of the corner guard cover 29 </ b> A are fixed to the revolving frame 11.

  Four through holes 55 are formed in the side surface portion 53 of the corner guard cover 29A. The turning frame cover 52 is provided with four screw seats 56 respectively corresponding to the four through holes 55 of the corner guard cover 29A. Then, a bolt 57 is inserted into the through hole 55 of the corner guard cover 29 </ b> A, and the tip end side of the bolt 57 is screwed into the screw seat 56. Thereby, the side surface portion 53 of the corner guard cover 29 </ b> A is fixed to the turning frame cover 52.

  The article storage space portion 33A of the present embodiment is formed by the turning frame cover 52 and the bottom surface portion 54 and the side surface portion 53 of the corner guard cover 29A. That is, articles are stored between the turning frame cover 52 and the corner guard cover 29A. Similarly to the first embodiment, an opening 48 for taking in and out articles from the article storage space 33A is formed in the side surface 53 of the corner guard cover 29A, and an opening / closing door that opens and closes the opening 48 49 is provided.

  Also in the present embodiment configured as described above, an article storage space can be secured by effectively utilizing the dead space in the corner guard device 25A as in the first embodiment.

  In the second embodiment, since the notch 32b is formed in the bottom plate 31 of the corner guard frame 28, the corner guard cover 29A has a bottom surface portion 54 for covering the bottom plate 31 of the corner guard frame 28. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention. More specifically, if the notch 32b is not formed in the bottom plate 31 of the corner guard frame 28, the corner guard cover may not have the bottom surface portion 54. That is, the article storage space portion may be formed by the turning frame cover 52, the bottom plate 31 of the corner guard frame 28, and the side surface portion 53 of the corner guard cover. Even in such a modification, the same effect as described above can be obtained.

  In the above description, the application of the present invention has been described by taking a small rear swivel type hydraulic excavator as an example. However, the present invention is not limited to this, and the present invention may be applied to a very small swivel type hydraulic excavator.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 4 Working apparatus 11 Revolving frame 12 Counterweight 13 Cab type cab unit 15 Driver's seat 17 Floor board part 18 Base part 18b Upper surface board 19 Engine room 20 Engine 22 Fuel tank 23 Hydraulic oil tank 25, 25A Corner guard device 26 Lower mounting bracket 27, 27A Upper mounting bracket 28 Corner guard frame 29, 29A Corner guard cover 30 Outer frame 31 Bottom plate 33, 33A Article storage space 34 Box 48 Opening 49 Opening / closing door 52 Revolving frame cover 53 Side part 54 Bottom part

Claims (3)

A lower traveling body, an upper revolving body provided on the upper side of the lower traveling body so as to be able to swivel, and a work device connected to the upper revolving body,
The upper swing body is a swing frame commonly used in the canopy specification and the cab specification, a fuel tank and a hydraulic oil tank disposed on the right front side of the swing frame, and a floor plate portion disposed on the left front side of the swing frame. A cab-type cab unit having a pedestal part and a driver's seat placed on an upper surface plate of the pedestal part, a counterweight disposed at a rear end part of the revolving frame and having an arcuate rear surface, An engine room on the rear side of the swivel frame, formed on the front side of the counterweight and below the upper surface plate of the pedestal portion, and mounted with a plurality of devices including an engine and a hydraulic pump;
The upper turning body is configured such that a virtual circle having a turning radius defined by a rear surface of the counterweight is within a vehicle width of the lower traveling body, and a left front corner portion of the cab unit is configured with the virtual circle. Spilled out of the way
In order to protect the left front corner portion of the cab unit, the upper swing body is formed on the left front outer peripheral portion of the swivel frame so as to protrude radially outward from the left front corner portion of the cab unit. In a small hydraulic excavator further equipped with an attached corner guard device,
The corner guard device is
An L-shaped outer frame that protrudes radially outward of the turning radius from the left front corner of the cab unit, and an inner side of the L-shaped outer frame, are provided on the left front outer periphery of the turning frame. A corner guard frame attached to the left front outer periphery of the swivel frame using a mounting bracket,
A corner guard cover attached to be positioned on the L-shaped outer frame of the corner guard frame;
An article storage space formed between the left front outer periphery of the swivel frame, the bottom plate of the corner guard frame, and the corner guard cover;
Formed in the corner guard cover, an opening for taking in and out articles from the article storage space,
A small hydraulic excavator comprising an opening / closing door for opening and closing the opening. The small hydraulic excavator according to claim 1,
The article storage space section is
A small hydraulic excavator comprising a box body disposed on the bottom plate for storing articles. The small hydraulic excavator according to claim 1,
A swivel frame cover extending along the left front outer periphery of the swivel frame;
The corner guard cover includes an L-shaped side surface portion disposed so as to be positioned on the L-shaped outer frame of the corner guard frame, and a bottom surface portion positioned above the bottom plate of the corner guard frame. Have
The small-sized hydraulic excavator, wherein the article storage space portion is formed by the revolving frame cover and the bottom surface portion and the side surface portion of the corner guard cover.

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