JP3461079B2 - All-turn type work machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full swing type working machine used as, for example, a hydraulic excavator, a hydraulic crane, etc., and particularly to a full swing type working machine suitably used in a narrow work site.

[0002]

2. Description of the Related Art A hydraulic excavator preferably used for excavating the ground at a construction site usually includes a lower traveling body, an upper revolving structure rotatably mounted on the lower traveling body, and an upper revolving structure. It consists of a working device provided on the front side of the body.

The upper revolving structure is usually provided on a revolving frame having a frame structure, a driver's cab provided on the front side of the revolving frame, and a rear side of the revolving frame for balancing with a working device. And a machine room formed by covering a space in front of the counterweight with a building cover. Inside the machine room, drive devices such as an internal combustion engine, a radiator, and a muffler are arranged. There is.

[0004]

By the way, since it is used for excavation work in a narrow work site, etc., a full swing type working machine in which a swing radius of an upper swinging body which rotates together with a working device is made small (for example, the actual opening 63). (JP-A-36567, etc.), it is required to make the swing radius of the upper swing body as small as possible. Therefore, the counterweight, which is usually arranged on the rear side of the upper swing body, is formed with an arc whose outer surface is within a predetermined swing radius with respect to the swing center, and the upper swing body is substantially circular when viewed from above. Is formed in.

Since the above-described full swing type working machine is required to make the swing radius of the upper swing body as small as possible, the counterweight is arranged at a position as close to the swing center of the upper swing body as possible. Is desirable.

However, since drive equipment such as an internal combustion engine, a radiator, and a muffler are arranged in the machine room located in front of the counterweight, the counterweight is provided only up to a position where the drive equipment does not interfere with the drive equipment. There is a problem in that it cannot be moved to the center of turning, and the turning radius of the upper turning body cannot be made sufficiently small.

Further, as a result of the counterweight being arranged at a position away from the center of revolving of the upper revolving structure toward the rear side, the machine room tends to be larger than necessary, and a building cover or the like for covering the machine room is provided. There is a problem that it will increase.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reduce the turning radius of the upper revolving superstructure without causing interference between the drive weights arranged in the machine room and the counterweight. It is an object of the present invention to provide a fully swivel type working machine that is capable of removing the cover that covers the machine room.

[0009]

In order to solve the above-mentioned problems, the invention of claim 1 is directed to an undercarriage and an upper revolving structure provided on the lower traveling body so as to be pivotable around a turning center. And a working device provided on the front side of the upper revolving structure, and the upper revolving structure includes a revolving frame, a driver's cab provided on the front side of the revolving frame, and a balance with the working device. For this purpose, a counterweight is provided on the rear side of the revolving frame, and the outer surface is formed with an arc having a predetermined revolving radius with respect to the revolving center, and a space in front of the front of the counterweight is covered by a building cover. The present invention is applied to a full swing working machine including a machine room formed by covering and a drive device including an internal combustion engine arranged inside the machine room.

The feature of the structure adopted by the invention of claim 1 is that the counterweight is provided on the inner surface of the counterweight.
It adapted to the shape of the prior SL driven equipment so as to face with a substantially constant spacing between the inner surfaces of Taueito and said drive equipment, to form a recessed portion for accommodating a part of the drive equipment, The outer surface of the counterweight is formed into a convex curve
The concave curved outer surface of the counterweight,
Fits within the radius of gyration to compensate for wall thickness with the recess
The purpose is to provide a built-up portion .

According to the above construction, the concave weight which is adapted to the shape of the driving equipment is formed on the inner surface of the counterweight, and a part of the driving equipment is accommodated in the concave depression, so that the counterweight of the counterweight can be accommodated. It is possible to make the inner surface and the driving equipment face each other with a substantially constant distance. Therefore, since the counterweight can be extended into the space between the drive devices and the counterweight, which has been wasted in the conventional technique, the position where the counterweight is disposed can be brought closer to the turning center side. Therefore, the swing radius of the upper swing body can be reduced. Also, counter weight
By installing a built-up part on the outer surface of the
There is a thin wall between the concave part on the inner surface of the
Can be prevented. Moreover, the built-up part is counted
Since it is installed within the turning radius of the taweight,
Counterweight turns half along with the build-up
It is possible to prevent the diameter from increasing.

[0012] According to a second aspect of the invention, the upper end of the counterweight that are configured to Ru provided overhang was eaves portion <br/> toward the machine room.

According to the above configuration, the counterweight is
A cover provided on the end side substantially covers a part of the machine room.
The building cover that covers the machine room is reduced.
You can

On the other hand , the feature of the configuration adopted by the invention of claim 3 is
The feature is that the counter weight is provided on the inner surface of the counter weight.
There is almost no gap between the inner surface of the weight and the drive equipment.
In the shape of the driving equipment so that they face each other with a space
Form a recess to fit and accommodate a portion of the drive equipment
And, on the upper side of the counterweight is to have a structure in which Ru provided overhang was visor portion toward the machine room.

According to the above construction, of the counter weights,
Form a concave portion that matches the shape of the driving equipment on the side surface,
By accommodating part of the drive equipment in the recess,
Almost constant between inner surface of unta weight and driving equipment
They can be face-to-face with different intervals. For this reason,
Drives and counters that have been wasted in conventional technology
Extend the counterweight into the space between the weights
As much as you can,
It can be moved closer to the center of turning, and the upper half
The diameter can be reduced. Further, since the eaves portion provided on the upper end side of the counterweight serves as a cover that substantially covers a part of the machine room, it is possible to reduce the number of building covers that cover the machine room.

According to a fourth aspect of the invention, the drive equipment includes a radiator and a muffler in addition to the internal combustion engine, and a hydraulic pump driven by the internal combustion engine.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described in detail with reference to FIGS.

In the drawings, reference numeral 1 denotes a hydraulic excavator as a fully swing type working machine according to this embodiment.
Is a lower traveling body 2, an upper revolving body 4 provided on the lower traveling body 2 via a revolving device 3 so as to be capable of revolving within a range of a revolving center, and a lower part of the upper revolving body 4 is located at the center of the front side. The upper revolving superstructure 4 has a substantially circular shape when viewed from above in order to reduce its turning radius R so that it can be made a small turn in a narrow work site. (See FIG. 2).

Reference numeral 6 denotes a revolving frame forming a frame structure of the upper revolving structure 4, and the revolving frame 6 has a structure as shown in FIG.
A pair of center beams 6A, which are located in the middle portion of the upper swing body 4 in the width direction and extend in the front-rear direction, and which also serve as support brackets for rotatably supporting the base end side of the working device 5,
6A and a bottom plate 6B having a substantially circular plate shape extending to the left and right of each center beam 6A. A plurality of cab mounts 6C, 6C, ... Are provided on the front left side of the bottom plate 6B of the revolving frame 6, and a plurality of engine mounts 6D, 6D ... Are provided between the left and right center beams 6A, 6A. Further, a plurality of counterweight mounts 6E, 6E, ... For fixing a counterweight 14, which will be described later, are provided in the center of the rear portion of the bottom plate 6B.

Reference numeral 7 denotes a driver's cab which is located on the front left side of the revolving frame 6 and is fixed on each of the driver's cab mounts 6C. In the cab 7, a driver's seat on which an operator is seated, a console panel, various An operation lever (neither is shown) or the like is housed.

Reference numeral 8 denotes a machine room between the operator's cab 7 and the counterweight 14 whose upper surface and left and right side surfaces are covered by the building cover 8A, and the rear side of the machine room is substantially covered by the counterweight 14. Is blocked by.

Reference numeral 9 is a drive device arranged in the machine room 8,
The drive device 9 is located on the left and right center beams 6A, 6A, and the engine mounts 6D of the revolving frame 6 are mounted.
An engine 10 as an internal combustion engine which is fixed to the engine 10 and is arranged so as to extend in the left and right directions, a radiator 11 arranged on the left side of the engine 10, and a muffler 12 arranged on the upper right side of the engine 10. It is configured to include and.

Although the engine 10 extends in the left and right directions as a whole, the turbocharger 10 is provided on the rear surface side.
A, an alternator 10B, an electrical component 10C, etc. are provided so as to project, and an oil pan 10D is provided so as to project on the lower surface side (see FIG. 5). Also, the radiator 11
Has a substantially flat plate shape, is positioned on the left side of the engine 10 and is fixed on the bottom plate 6B of the revolving frame 6, and cools the engine 10 by cooling water circulating between the engine 10 and the bottom plate 6B. Furthermore, the muffler 12 has a substantially cylindrical shape,
It is arranged on the upper right side of the engine 10 so as to extend in the front-rear direction.

Reference numeral 13 denotes the engine 1 under the muffler 12.
0 is a hydraulic pump disposed on the right side of the
By driving the hydraulic pump 13, the pressure oil from the hydraulic pump 13 is supplied to and discharged from the traveling motor of the lower traveling body 2, the swing motor of the swinging device 3 (neither is shown), and each cylinder provided in the working device 5. To be done.

Reference numeral 14 denotes a counterweight located on the rear side of the revolving frame 6 and fixed on each of the counterweight mounts 6E. In the counterweight 14, the upper revolving structure 4 revolves on the lower traveling structure 2. At times, it is for balancing with the working device 5 provided on the front side of the upper swing body 4. Here, the counterweight 14 includes an upper surface 15, a lower surface 16, an outer surface 17 having an arc shape within a predetermined turning radius R with respect to the turning center of the upper turning body 4, and a rear portion of the machine room 8. Inner surface 1 that closes the side
8 and, for example, by a cast metal block,
Alternatively, it is formed by means such as filling concrete into the can body.

Here, as shown in FIG. 5, the lower surface 16 of the counterweight 14 is formed with an engagement step portion 16A with which the rear end of the revolving frame 6 engages, and a plurality of (1 Only the screw seat member 19 is cast.
Then, the counterweight 14 is fixed to the rear side of the revolving frame 6 by screwing the mounting bolt 19A into the screw seat member 19 from the lower surface side of the revolving frame 6. At this time, the lower surface 16 of the counterweight 14 and the lower surface of the revolving frame 6 form substantially the same plane, and the upper surface 15 of the counterweight 14 and the upper surface of the building cover 8A form substantially the same plane. There is. Then, in a state where the counterweight 14 is fixed to the rear side of the revolving frame 6, the inner side surface 18 of the counterweight 14 substantially closes the rear side of the machine room 8 and the drive provided in the machine room 8 is stopped. It faces the device 9 at a substantially constant interval.

Here, the outer surface 1 of the counterweight 14
As shown in FIGS. 5 to 7, the reference numeral 7 is formed in a convex curved shape in the upward and downward directions, and an intermediate portion in the vertical direction projects to the rear side of the upper revolving superstructure 4 most, and this portion is substantially the upper revolving superstructure. A turning radius R of 4 (see FIG. 2) is defined.

The inner surface 18 of the counterweight 14 is also
As shown in FIGS. 5 to 7, a concave portion 20 having a shape adapted to the shape of the drive device 9 is formed in the engine. The concave portion 20 is for an engine adapted to the shape of the engine 10 as described later. It comprises a concave portion 20A, a radiator concave portion 20B conforming to the shape of the radiator 11, a muffler concave portion 20C conforming to the shape of the muffler 12, and the like.

Reference numeral 20A denotes an inner surface 1 of the counterweight 14.
8, the engine recessed portion 20A protrudes toward the counterweight 14 and the turbocharger 10 mounted on the engine 10 as shown in FIG.
The turbocharger 10A, the alternator 10B, the electrical component 10C, and the like face the engine recessed portion 20A at a substantially constant distance a. .

Reference numeral 20B denotes a radiator recessed portion, and the radiator recessed portion 20B is fixed to the bottom plate 6B of the swivel frame 6 and has a shape of the radiator 11 protruding toward the counterweight 14 as shown in FIG. Accordingly, the counterweight 14 is formed so as to gouge the inner side surface 18 of the counterweight 14 and faces the radiator 11 at a substantially constant distance a.

Reference numeral 20C designates a concave portion for muffler. The concave portion 20C for muffler has a counterweight 14 as shown in FIG.
It is formed so as to engrave the inner side surface 18 of the counterweight 14 according to the shape of the muffler 12 protruding to the side, and faces the outer surface of the muffler 12 at a substantially constant interval a.

Reference numeral 21 denotes a radiator eave portion (see FIG. 6) provided on the upper end side of the counterweight 14 and provided on an upper portion of the radiator recess 20B, and 22 denotes an upper end portion of the counterweight 14. The muffler eaves (see FIG. 7) provided on the upper side of the muffler concave portion 20C are respectively shown, and the eaves 21 and 22 are formed so as to project toward the inside of the machine room 8, and the building cover It forms a plane substantially the same as 8A. Therefore, the building cover 8A can be reduced by partially covering the machine room 8 with the eaves 21 and 22.

Reference numeral 23 denotes an outer surface 17 of the counterweight 14.
7 shows a built-up portion provided on the upper side of the convex curved shape, and the built-up portion 23 has a counter as shown in FIG. 7 so that the projecting end 23A thereof fits within the turning radius R of the upper swing body 4. It is integrally formed on the outer side surface 17 of the weight 14. in this case,
Since the outer side surface 17 is formed in a convex curve shape in which the upper and lower intermediate portions project to the outermost side, the built-up portion 23 provided on the upper side of the outer side surface 17 can be housed within the turning radius R. it can.

The built-up portion 23 is provided with a muffler concave recess 20C on the inner surface 18 of the counterweight 14 so that the muffler concave recess 20C and the outer surface 17 of the counterweight 14 are separated from each other. Prevents thinning. As a result, the inner surface 18 of the counterweight 14 is
In addition, the counterweight 14 can be reliably formed even when a concave recess having a large depth of cut such as the concave recess 20C for muffler is provided.

Reference numeral 24 denotes a built-up portion provided on the upper side of the outer side surface 17 of the counterweight 14 corresponding to the radiator recess 20B. The built-up portion 24 is shown by the solid line in FIG. 4 and FIG.
As indicated by an imaginary line in the inside, thinning between the radiator recess 20B and the outer side surface 17 of the counterweight 14 is prevented.

The hydraulic excavator 1 according to the present embodiment has the above-mentioned structure. For example, when the operator operates the operation lever provided in the operator's cab 7, the working device 5 is moved with respect to the upper revolving structure 4. Perform excavation work such as earth and sand while moving up and down. When the upper-part turning body 4 performs a turning operation during excavation work in a narrow work site, for example, the boom of the working device 5 is turned upward (elevated) and the arm and bucket are folded. By rotating so as to fold, the entire working device 5 is folded in a substantially upright state within the turning radius R of the upper swing body 4. In this state, by rotating the upper revolving structure 4, the upper revolving structure 4 makes a small revolving motion within the range of the revolving radius R together with the working device 5, and brings the working device 5 to a desired working position even in a narrow work site. It can be moved.

However, according to this embodiment, the inner surface 18 of the counterweight 14 is fitted to the engine 10, the radiator 11, the muffler 12, and the like, which form the drive device 9 arranged in the machine room 8. Engine recess 20A,
Radiator recessed portion 20B and muffler recessed portion 20
By providing C or the like, the driving device 9 and the inner side surface 18 of the counterweight 14 can be opposed to each other with a substantially constant distance a. Therefore, compared to the conventional technology,
Since the space formed between the drive device 9 and the inner surface 18 of the counterweight 14 can be reduced, the counterweight 1
The arrangement position of 4 can be brought close to the center of rotation of the upper swing body 4. As a result, the swing radius R of the upper swing body 4 can be reduced, and the small swing of the upper swing body 4 can be realized.

Further, the outer surface 17 of the counterweight 14 is
By providing the built-up portion 23 and the like on the counterweight 14, the wall thickness between the outer surface 17 of the counterweight 14 and the muffler recess 20C provided on the inner surface 18 is compensated, so that, for example, on the counterweight 14 side. Depending on the shape of the drive device 9 that has largely protruded, even when the concave surface 20 having a large recess depth is provided on the inner surface 18 of the counterweight 14, the concave surface 2
The thickness between 0 and the outer side surface 17 can be compensated, and the counterweight 14 can be reliably molded.

Moreover, the outer surface 1 of the counterweight 14
7 is formed in a convex curved shape in the upward and downward directions, and the built-up portion 23 and the like are provided on the upper side of the convex curved shape so that the built-up portion 23 can fit within the turning radius R of the upper revolving structure 4. Therefore, even when the built-up portion 23 and the like are provided on the outer surface 17 of the counterweight 14, it is possible to reliably prevent the turning radius R of the upper-part turning body 4 from increasing.

Further, the radiator eaves portion 21 provided on the upper end side of the counterweight 14 at the upper portion of the radiator recessed portion 20B and the muffler eaves portion provided at the upper portion of the muffler recessed portion 20C. 22 and the building cover 8A form substantially the same plane as the building cover 8A and partially cover the machine room 8. Therefore, compared with a structure such as a hydraulic excavator according to the related art in which the drive device is covered only by the building cover. As a result, the building cover can be significantly reduced.

In the above embodiment, the drive device 9 is constituted by including the engine 10, the radiator 11, the muffler 12, the hydraulic pump 13 and the like, but the present invention is not limited to this. For example, an air cleaner, a supply / discharge pipe, etc. may be included.

Further, in the above-mentioned embodiment, the case where the small swing type hydraulic excavator 1 is applied as the full swing type working machine has been taken as an example, but the present invention is not limited to this, and other works such as a hydraulic crane, for example. It can also be applied to machines.

[0043]

As described in detail above, according to the first aspect of the invention, the inner surface of the counterweight provided on the rear side of the upper revolving structure conforms to the shape of the drive equipment arranged in the machine room. Since the drive device and the inner surface of the counterweight face each other at a substantially constant interval by forming the recessed recessed portion and accommodating a part of the drive device in the recessed portion, the counterweight and the drive The counterweight can be brought closer to the swing center of the upper swing body by the amount of the reduced space between the counterweight and the device. As a result, the turning radius of the upper swing body can be reduced, and for example, a small swing can be realized in a narrow work site. Also, counter weight
By installing a built-up part on the outer surface of the
Compensate for the wall thickness between the concave surface on the inner surface of the gutter and the outer surface
Because of the configuration, for example, a large collision is made on the counterweight side.
Depending on the shape of the drive equipment that has been taken out,
Even when a large concave portion is provided on the side surface, the concave portion and the outside
It is possible to prevent thin space between the surface and the counterway.
The mold can be reliably molded. Moreover, the built-up part should be
Is it installed so that it fits within the turning radius of the unta weight?
, The counterweight of the counterweight
It is possible to prevent the turning radius from increasing.

According to the second aspect of the present invention, an eave portion is provided on the upper end side of the counterweight so as to project toward the machine room.
By evacuation, the eaves partly covers a part of the machine room.
Since it acts as a cover, it only serves to cover the drive equipment.
It is possible to reduce the number of building covers used .

On the other hand, according to the invention of claim 3, the upper turning
On the inner surface of the counterweight provided on the rear side of the body,
Recessed part that conforms to the shape of the drive equipment installed in the machine room
And forming a part of the driving device in the recess.
Allows the drive equipment and the inner surface of the counterweight to be almost
Since it is configured to face each other with a fixed interval, the counter
The space between the weight and the drive is reduced
It is possible to bring the taweight to the center of rotation of the upper revolving structure.
Wear. As a result, the swing radius of the upper swing structure should be reduced.
Can be realized, for example, to realize a small turn in a narrow work site.
be able to. Further, by providing the eaves portion that extends toward the machine room on the upper end side of the counterweight, the eaves portion serves as a cover that substantially covers a part of the machine room. It is possible to reduce the number of building covers used.

Further, according to the invention of claim 4, driving equipments are provided by forming a recessed portion corresponding to the shape of the radiator, the muffler and the hydraulic pump on the inner surface of the counterweight in addition to the internal combustion engine. Even when the internal combustion engine, the radiator, the muffler, and the hydraulic pump are included, the drive devices and the inner surface of the counterweight can face each other with a substantially constant distance.

[Brief description of drawings]

FIG. 1 is an external view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view of the hydraulic excavator in FIG. 1 seen from above.

3 is a perspective view showing a swivel frame in FIG. 1. FIG.

FIG. 4 is a partially cutaway plan view showing an upper revolving structure of the hydraulic excavator in FIG. 1 in an enlarged manner.

5 is a vertical cross-sectional view as seen from the direction of arrows VV in FIG.

6 is a vertical cross-sectional view as seen from the direction of arrows VI-VI in FIG.

7 is a vertical cross-sectional view as seen from the direction of arrows VII-VII in FIG.

[Explanation of symbols]

2 Undercarriage 4 Upper revolving structure 5 Working device 6 swivel frame 7 Driver's cab 8 machine room 8A building cover 9 Drive equipment 10 engine 11 radiator 12 muffler 14 counterweight 17 Outside 18 Inside 20 recess 20A engine concave recess (concave) 20B radiator recess (recess) 20C Muffler concave recess (concave) 21 Radiator eaves (eaves) 22 Eaves for mufflers (overhangs) 23, 24 Overlay part

Claims (4)

(57) [Claims] 1. A lower traveling body, an upper revolving body provided on the lower traveling body so as to be rotatable around a revolving center, and a working device provided on a front side of the upper revolving body. The upper revolving structure is provided on a rear side of the revolving frame for balancing the revolving frame, a driver's cab provided on the front side of the revolving frame, and the working device, and an outer surface of the revolving frame with respect to the center of rotation. Counterweight formed with an arc within a predetermined turning radius, a machine room formed by covering a space in front of the front surface of the counterweight with a building cover, and disposed inside the machine room. And a drive device including an internal combustion engine, wherein the counterweight is provided on the inner surface of the counterweight.
Between the inner surface of the bets and the drive equipment with a substantially constant spacing adapted to the shape of the prior SL driven equipment so as to face to form a recessed portion for accommodating a part of the drive equipment, The outer surface of the counterweight is formed into a convex curve,
On the convex curved outer surface of the counterweight,
Build-up portion that fits within the turning radius to compensate for the wall thickness between
A fully revolving type working machine characterized by having a structure . 2. The upper end of the counterweight is provided with the
The fully revolving work machine according to claim 1, further comprising an overhanging portion that projects toward the machine room . 3. An undercarriage and a turn on the undercarriage.
An upper revolving structure provided so as to be rotatable around a heart, and the upper part
And a working device provided on the front side of the revolving structure.
The upper revolving structure includes a revolving frame and a front portion of the revolving frame.
Balance the cab provided on the side with the working device.
Is provided on the rear side of the revolving frame for
Has an arc that is within the specified turning radius with respect to the turning center.
Formed by the counter weight and the counter weight
To cover the space in front of the front of the building with a building cover
And a machine room formed by the
Complete rotation composed of drive devices including an internal combustion engine
In the rotary working machine, the counterweight is provided on the inner surface of the counterweight.
Between the inner surface of the chassis and the drive equipment.
Match the shape of the driving equipment so that they face each other
And, forming a recessed portion for accommodating a part of the drive equipment, the upper side of the counterweight, characterized in that a structure in which Ru provided overhang was visor portion toward the machine room < br /> Full swing type working machine. Wherein said drive equipment, the total slewing type working machine according to the the other radiator and the muffler of the internal combustion engine, comprising a hydraulic pump driven by the internal combustion engine according to claim 1 or 3.