JP2003213726A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the formation of an opening in the case of a side view from the horizontal direction between a counter weight arranged at the rear end section of a revolving superstructure and the left-right external side plates of a housing chamber arranged on the front side of the counter weight. <P>SOLUTION: Construction machine is constituted such that upstanding end faces 11d and 11e in which the surface directions are directed in front and rear and vertical directions are formed at the left-right side end sections of the counter weight 11, the rear extending sections 13d and 14d of cover plates 13a and 14b opening and closing the left-right external side faces of the left-right side chambers 13 and 14 are overlapped in side view in the horizontal direction to the upstanding end faces 11d and 11e and the openings S among the cover plates 13a and 14a and the upstanding end faces 11d and 11e of the counter weight 11 are formed in the left-right cross directions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of construction machines such as hydraulic excavators.

[0002]

2. Description of the Related Art Generally, some construction machines such as hydraulic excavators have a lower traveling body provided with an upper revolving structure so that the upper revolving structure can freely rotate. A counterweight is provided to balance the work load of the front attachment attached to the front part. In such a case, a storage chamber for storing various devices such as an engine may be provided on the front side of the counterweight. In such a case, conventionally, the front end portions of the left and right side surfaces of the counterweight are stored. It is provided so as to face the rear ends of the left and right outer plates that cover the chamber in the front-rear direction, and a gap having a front-rear width is formed between the front end of the counterweight and the rear ends of the left and right outer plates. It was. By the way, the upper revolving structure is provided with a cab, a hydraulic oil tank, a fuel tank, and the like in addition to the counterweight and various equipments and devices stored in the storage chamber. In assembling into the gantry frame of the upper revolving structure, the constituent units are sequentially assembled into the gantry frame from the viewpoints of assemblability, appearance, and the like, and finally the counterweight is assembled. In this case, there are errors (tolerances) such as machining error and assembling error. Therefore, if the counterweight, which is the rearmost component unit, is installed in line with the front side alignment, the counterweight will not be attached to the rear end of the gantry frame. If the edges are displaced, the appearance may be impaired, and the balance with the work load may be lost due to the displacement of the counterweight. For this reason, the counterweights are assembled in the rear side aligned state. However, in this case, the gap between the front end portion of the counterweight and the rear end portions of the left and right outer side plates of the storage chamber is inevitably large. This gap is clearly visible from the left and right side surfaces of the upper revolving superstructure, which is not desirable in appearance. Therefore, conventionally, when assembling each constituent unit, it is necessary to assemble the constituent units in consideration of the above-mentioned error (tolerance), and not only the skill is required, but also the workability is impaired. was there. Therefore, in order to deal with these problems, at the front end portions of the left and right side surfaces of the counterweight,
A protrusion is formed that protrudes toward the left and right outer side plates of the storage chamber, and the protrusion is used to adjust the clearance between the front end of the counterweight and the rear end of the left and right outer side plate of the storage chamber. A substitute is proposed (for example, refer to Patent Document 1).

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 11-229441

[0004]

SUMMARY OF THE INVENTION However, in Patent Document 1, the grinder or the like is used after measuring the cutting allowance of the protruding portion of the counterweight with the left and right outer side plates of the storage chamber temporarily fixed. There is a problem that it is difficult to put the projecting portion into practical use because it requires a laborious and time-consuming work of shaving the protruding portion and then finally assembling the left and right outer side plates of the storage chamber. There is a problem to be solved.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and an upper revolving structure provided on a lower traveling structure so as to be freely rotatable. In a construction machine in which a counterweight is attached to a rear end of the counterweight, the rear end of at least one of the left and right outer plates of the upper swing body is overlapped with at least one of the left and right side ends of the counterweight. When viewed from the side from at least one of the left and right sides, there is no gap between the outer plate of the upper swing body and the counterweight. And by doing this,
Even if there is a large assembling error between at least one of the left and right outer plates that are assembled in front alignment and the counter weight that is assembled in rear alignment, the outer plate and the counter weight can be misaligned in the front-rear direction at the overlap portion. There is no gap between them when viewed from the side in the direction, and the appearance is not damaged. In addition, it is troublesome to assemble the product in consideration of errors (tolerances) such as machining errors and built-in errors, and to grind the counterweight. It is possible to improve the workability of assembling without requiring any special work. In this, at least one of the left and right side end portions of the counterweight has a standing end face whose surface direction faces the front-rear direction and the vertical direction, and the standing end face has
The rear extension portion of at least one of the left and right outer plates of the upper swing body is overlapped in a side view in the left-right direction so that the gap between the at least one outer plate and the counterweight is in the left-right width direction. Can be configured. In addition, at least one of the left and right side end portions of the counterweight is formed with an extension surface portion whose surface direction faces the front-back and up-down directions, and the extension surface portion has a rear end of at least one of the left and right outer plates of the upper swing body. The parts can be configured to overlap in a side view in the left-right direction. further,
In these cases, when a storage room for storing various devices and the like is arranged in front of the counterweight, an outer plate overlapping at least one side end portion of the counterweight is a left and right side of the storage room. It can be a cover plate that opens and closes at least one outer surface. In this case, the cover plate is set to a hinged door type in which a front end portion is swingably supported, and latch means for releasably locking the closed cover plate is provided over the cover plate and the counterweight. The latch means can be arranged in a space formed in the lap portion, and by doing so, the latch means can be effectively used in the dead space formed in the overlap portion between the cover plate and the counterweight. Will be possible. Further, when the outer surface of the counterweight is covered with the outer cover, the outer cover is extended to a portion overlapping with the outer slope of the upper swing body, so that the outer appearance can be improved.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to FIGS. In the drawing, 1
Is a hydraulic excavator. In the hydraulic excavator 1, an upper revolving structure 3 is rotatably supported above a crawler type lower traveling structure 2, and a cradle frame 3 a forming a pedestal of the upper revolving structure 3 is provided. Boom 4, arm 5,
A front attachment 7 including a member device such as a bucket 6 is mounted, a cab 8 is arranged on the left side of the front attachment 7, and a tank chamber 9 such as a fuel tank or a hydraulic oil tank is arranged on the right side thereof. The basic structure is the same as before.

At the rear of the upper swing body 3, there is arranged an engine room 10 for accommodating an engine (not shown) and various equipment around the engine, and a counterweight 11 is provided on the rear side of the engine room 10. The counterweight 11 is attached to the gantry frame 3a via bolts 12 that are screwed into an attachment seat 11a fixed to the counterweight 11. The counterweight 11 is formed in a curved shape in a plan view, and the left and right front end faces 11b, 1 of the counterweight 11 are formed.
Standing end faces 11d and 11e whose surface directions face the front-rear direction and the vertical direction are formed at left and right outer end portions of 1c. The standing end faces 11d and 11e are provided on the left and right side chambers 1 to be described later.
The three and four left and right cover plates 13a and 14a are set to be covered in an overlapping state when viewed from the left and right sides.

On the other hand, left and right side chambers 13 and 14 are formed on both the left and right sides of the engine room 10. In the present embodiment, a radiator and an oil cooler (not shown) are provided in the left side chamber 13 in the right side chamber 14. Stores various devices (not shown) such as filters. The left and right side chambers 13 and 14 are respectively arranged in the left rear side of the cab 8 and the right side rear of the tank chamber 9, and the cover plates 13a for opening and closing the left and right outer side surfaces of the left and right side chambers 13 and 14, The front end of 14a has support shafts 13c, 1 on front frames 13b, 14b for forming left and right side chambers 13, 14.
4C is a hinged door type hinged to the left and right sides so as to be openable and closable outwardly, and the rear end portions of the cover plates 13a and 14a have left and right front end surfaces 11 of the counterweight 11.
The counterweight 1 is extended rearward from b and 11c.
1 is a rear extension 13d, 14d that covers the standing end surfaces 11d, 11e of FIG. 1 in an overlapping state in left and right side views, whereby a gap S formed between the cover plates 13a, 14a and the counterweight 11, That is, the gap S between the rear ends of the cover plates 13a and 14a and the standing end faces 11d and 11e of the counterweight 11 is configured to be visually recognized in the left-right width direction on the rear outer peripheral surface of the upper swing body 3.

Further, lock extension latches 13e, 14e are provided on the rear extensions 13d, 14d of the cover plates 13a, 14a. When the cover plates 13a and 14a are closed, the latches 11e and 14e are provided so that the latches 13e and 14e face the standing end surfaces 11d and 11e of the counterweight 11 in the left-right direction.
The latch means is configured to be engaged with and disengaged from the cover plate 13a, 14e, and the latch members 11f, 11g. The latch means includes rear extension parts 13d, 14d of the cover plates 13a, 14a and the counterweight 11. It is arranged in a dead space D formed between the standing end faces 11d and 11e. Note that 13f and 14f are handles for opening and closing the cover plates 13a and 14a in the laterally outward direction.

In the structure constructed as described above, in the upper revolving structure 3, the cab 8 and the tank chamber 9 are installed in the gantry frame 3a in a front-aligned state, and the engine room 10, in a state conforming to the front-aligned state. While the left and right chambers 13 and 14 are further assembled, the counterweight 11 is assembled in a rear-aligned state with respect to the gantry frame 3a. At this time, the counterweight 11 and the left and right outer plates of the upper swing body 3 are installed. The cover plates 13a and 14a are the standing end faces 11d and 11e whose surface directions formed on both left and right ends of the counterweight 11 face forward and backward and up and down.
A rear extension 13d of the cover plates 13a, 14a,
The counter weight 11 and the cover plate 13 are configured to overlap each other when viewed from the left and right sides.
The gap S formed between a and 14a appears in the left-right width direction, and as a result, the cab 8 and the like are assembled in front alignment, while the counter weight 11 is generated in the rear alignment. And left and right cover plates 13a, 1
The assembling error in the front-rear direction with respect to 4a only shifts in the front-rear direction at the overlap portion, and the gap S in the left-right direction does not change. Therefore, like a conventional gap having a front-rear width between the left and right outer plates and the counterweight, the gap changes depending on the size of the assembling error.
When the error is large, the problem that a large gap is opened and the appearance is impaired is solved, and the constituent unit and the engine room 10 that form the upper revolving structure 3 may be assembled in the front side alignment. It is not necessary to assemble in consideration of error (tolerance) such as error, and it is possible to reduce the labor and time required for shaving and temporary fixing such as when the counterweight is provided with a protruding portion for adjusting the clearance. Such work is not necessary, and workability of assembling the upper swing body 3 can be improved.

Moreover, in this case, the cover plates 13a, 1
The rear extension parts 13d and 14d of 4a are counterweight 1
Since it is the structure which overlaps with the standing end surfaces 11d and 11e of 1, the cover plates 13a and 14a are attached to the rear extension 13
It is only necessary to increase the size by d and 14d, and it is not necessary to form the rear extension portions 13d and 14d by separate members. In addition, the above-mentioned latch means for releasably locking the closed cover plates 13a, 14a is the cover plates 13a, 1a.
4a rearward extensions 13d and 14d and counterweight 1
Since it is arranged in the dead space D formed in the overlapping portion with the standing end surfaces 11d and 11e of 1, the substantial space of the left and right side chambers 13 and 14 is not narrowed by providing the latching means. It is possible to effectively use the dead space D.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described with reference to FIG. In the drawing, reference numeral 15 is an upper revolving structure of a hydraulic excavator, and a front frame 16a constituting a frame of the upper revolving structure 15 is provided with a front attachment 16 at a substantially central portion on the front side. Is provided with a cab 17, a tank chamber 18 such as a fuel tank or a hydraulic oil tank is provided on the right side, and an engine room 19 is provided at the rear of the gantry frame 15a. The basic configuration such as the counterweight 20 being attached to is similar to that of the first embodiment.

Left and right side chambers 21 and 22 are formed on the left and right sides of the engine chamber 19 in a state of being positioned on the left rear side of the cab 17 and on the right side rear side of the tank chamber 18, as in the first embodiment. ing. A radiator and an oil cooler (not shown) are housed in the left side chamber 21, and various types of equipment (not shown) such as a filter are housed in the right side chamber 22.

On the other hand, the counterweight 20 is formed in a curved shape so that both left and right sides are positioned forward, and has a weighted core portion 20a formed by stacking a plurality of slab materials vertically and horizontally. An outer cover 20b that covers the rear outer surface and the left and right outer surfaces of the core portion 20a, a top plate 20c that covers the upper side of the core portion 20a, a bottom plate 20d that covers the lower side, and the like. Further, in the present embodiment, projecting portions 20e which are stepped and project forward are formed integrally with the lower portions of the left and right side portions of the counterweight 20, and the projecting portions 20e are the left and right side chambers 21, 22. It is configured to reach below. Further, the right side portions of the top plate 20c and the bottom plate 20d project forward of the core portion 20a, and form the top and bottom portions of the right chamber 22.

Further, at the front end portions of the left and right outer side surfaces of the counterweight 20 (the front end portions of the portion excluding the projecting portions 20e), curved extensions are formed so that the surface directions thereof are the front-back direction and the vertical direction. Surface portions 20f and 20g are formed. The extending surface portions 20f and 20g are set to be covered by the left and right cover plates 21a and 22a that open and close the left and right outer side surfaces of the left and right chambers 21 and 22 in an overlapping state when viewed from the left and right sides, as described later. Has become.

Further, the left and right cover plates 21a, 22a
Like the left and right cover plates 13a and 14a of the first embodiment, is a hinged door type whose front end portion is hinged so that it can be opened and closed in the left and right outer directions.
The rear end portions 21b and 22b of the a are extended rearward from the front ends of the extension surface portions 20f and 20g of the counterweight 20, and cover the extension surface portions 20f and 20g of the counterweight 20 in an overlapping state. As a result, the left and right cover plates 21a, 2 when viewed from the left and right sides.
There is no gap between the 2a and the counterweight 11.

Here, the outer cover 20b of the counterweight 20 is extended to a portion covering the extended surface portions 20f and 20g. Thereby, the cover plates 21a, 22
When the cover plate 21a, 22a and the extending surface portions 20f, 20g have a small amount of overlap with a closed state, a part of the extending surface portions 20f, 20g will be seen from the outside. The part to be covered is covered with the outer cover 20b so that the core part 20a is not exposed.

In the second embodiment as well, although not shown, a latch means is provided at an overlapping portion between the cover plates 21a and 22a and the extending surface portions 20f and 20g of the counterweight 20. Also, 21c, 2
Reference numeral 2c is a handle for opening and closing the cover plates 21a and 22a in the laterally outward direction.

In the second embodiment constructed as described above, in the upper revolving structure 15, the cab 17 and the tank chamber 18 are assembled in a pre-aligned state with respect to the gantry frame 15a, and in this pre-aligned state. While the engine compartment 20 and the left and right side compartments 21 and 22 are further assembled in a conforming state, the counterweight 20 is assembled in a rear-aligned state with respect to the gantry frame 15a. The cover plates 21a and 22a, which are the left and right outer plates of the reference numeral 15, are formed on the left and right end portions of the counterweight 11 on the extended surface portions 20f and 20g whose front and rear directions are the front and back and up and down directions.
The rear end portions 21b and 22b of 22a overlap each other. Therefore, the cab 17 and the like are assembled in front alignment, while the counterweight 20 is assembled in rear alignment, the counterweight 20 and the left and right cover plates 21.
The assembling error (tolerance) in the front-rear direction with respect to a and 22a only shifts in the front-rear direction at the overlap portion, and there is no gap in the front-rear width direction between the cover plates 21a, 22a and the counterweight 20. As a result, as in the case of the first embodiment described above, the problem of impairing the appearance is solved, and there is no need to assemble in consideration of an error (tolerance) such as a processing error or a built-in error. Further, labor and time-consuming work such as shaving the counterweight are not required, and the workability of assembling the upper swing body 15 can be significantly improved.

Further, in the second embodiment, since the extension surface portions 20f and 20g of the counterweight 20 are covered with the outer cover 20b, the cover plates 21a and 22a are closed. Extension surface part 2
Even if a part of 0f, 20g is visually observed from the outside, the core portion 20a of the counterweight 20 is not exposed, which is preferable in appearance.

The present invention is not limited to the above-mentioned first and second embodiments. Of course, when the left and right outer side surfaces of the counterweight are overlapped with the rear end portions of the outer plates of the upper revolving structure. It is also possible to configure so that no gap is formed not only in the right and left side views but also in the rear view.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator showing a first embodiment.

FIG. 2 is a plan view of the hydraulic excavator showing the first embodiment.

FIG. 3 is a rear view of the hydraulic excavator showing the first embodiment.

FIG. 4 is a plan view of a main part of the upper swing body showing the first embodiment.

5A and 5B are an enlarged view of a main part showing a left side chamber cover plate in a closed state and a left side room cover plate in a closed state in the first embodiment.

FIG. 6 is a plan view of a hydraulic excavator showing a second embodiment.

7 (A) and 7 (B) are a partially omitted left side view and a partially omitted right side view of an upper revolving superstructure in the second embodiment.

8A and 8B are an enlarged view of a portion A and an enlarged view of a portion B of FIG.

9 (A) and 9 (B) are rear views of an overlapping portion between a left side chamber cover plate and a counterweight and a rear side view of an overlapping portion between a right side chamber cover plate and a counterweight in the second embodiment. Is.

10A and 10B are perspective views of an overlapping portion of a left side chamber cover plate and a counterweight, and a perspective view of an overlapping portion of a right side chamber cover plate and a counterweight in the second embodiment. Is.

11A and 11B are a rear perspective view and a front perspective view of the counterweight according to the second embodiment.

[Explanation of symbols]

3 Upper revolving structure 10 engine room 11 counterweight 11d, 11e Standing end face 13 Left side room 13a cover plate 13d rear extension 13e latch 14 Right side room 14a cover plate 14d Rear extension 14e latch 15 Upper revolving structure 20 counterweight 20f, 20g extension surface 21 Left chamber 21a cover plate 21b rear end 22 Right side room 22a cover plate 22b rear end

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Kojima             4-10-1, Yoga, Setagaya-ku, Tokyo             Within Mitsubishi Corporation (72) Inventor Keiichi Miyake             4-10-1, Yoga, Setagaya-ku, Tokyo             Within Mitsubishi Corporation (72) Inventor Takahiro Goto             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. (72) Inventor Tamotsu Yamamoto             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. (72) Inventor Yasuo Yamashita             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. (72) Inventor Fujimi Fujimi             2-3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture             New Asahi Building Trans Cosmos Co., Ltd.             Within F-term (reference) 2D015 CA03 FA01

Claims (6)

[Claims] 1. A construction machine in which a counterweight is attached to a rear end portion of an upper revolving structure rotatably provided on a lower traveling structure, wherein at least one of left and right side ends of the counterweight has the upper revolving structure. It is characterized in that at least one of the left and right outer plates is made to overlap a rear end portion thereof so that there is no gap between the outer plate of the upper swing body and the counterweight when viewed from the side of at least one of the left and right. Construction machinery. 2. The standing weight face according to claim 1, wherein at least one of the left and right side ends of the counterweight has a standing end face whose surface direction faces the front-rear direction and the up-down direction, and the standing end face has at least one of the left and right sides of the upper swing body. The outer extension of the outer plate is overlapped in a side view in the left-right direction, and a gap between the counterweight and at least one of the left and right outer plates is arranged in the left-right width direction. machine. 3. The extension surface portion of which the surface direction faces the front-rear direction and the up-down direction, is formed on at least one of the left and right side end portions of the counterweight, and the extension surface portion has the left and right of the upper revolving structure. A construction machine, wherein at least one of the outer plates has a rear end portion which is configured to be overlapped in a lateral side view. 4. The outside according to claim 1, wherein a storage chamber for storing various devices is arranged in front of the counterweight, and the counterweight overlaps at least one side end of the counterweight. The construction machine is characterized in that the board is a cover board that opens and closes at least one outer side surface of the storage chamber. 5. The cover plate according to claim 4, wherein the cover plate is set to a hinged door type in which a front end portion is swingably supported, and a latch means for releasably locking the closed cover plate is provided. A construction machine characterized in that it is arranged in a space formed at an overlapping portion between the counterweight and the counterweight. 6. The outer cover of claim 1, 2, 3, 4 or 5, wherein when covering the outer surface of the counterweight with the outer cover, the outer cover is extended to a portion overlapping the outer slope of the upper swing body. A construction machine characterized by