JP2000190742A - Rotary construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase weight of a counter weight and to enhance weight balance in respect to a working device by mounting an engine on a rotating frame in a state of three-point suspension and building up the counter weight. SOLUTION: An engine 22 is horizontally positioned on a rotating frame 3 between a cab 4 and a counter weight 21, and the engine 22 is three-point suspended by using three engine supporting mounts 27A, 27B, and 27C. The first engine supporting mount 27A is installed between a flywheel casing 23 and the rotating frame 3, under an oil pump 24 provided on one side in the longitudinal direction of the engine 22. The second and third engine supporting mounts 27B and 27C are separately installed fore and aft of the engine 22 at the other end, between the engine and the rotating frame 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine such as a hydraulic excavator, and more particularly to a small swing type construction machine having a reduced swing radius.

[0002]

2. Description of the Related Art In general, as a construction machine such as a hydraulic excavator, a lower traveling body, an upper revolving body which is mounted on the lower traveling body so as to be pivotable using a revolving wheel or the like, and a front side of the upper revolving body. 2. Description of the Related Art There has been known an apparatus constituted by a working device provided so as to be capable of raising and lowering.

[0003] A small-swing hydraulic excavator will be described as an example of this type of conventional swing-type construction machine with reference to FIGS. 5 to 7.

In the drawing, reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 has a revolving frame 3;
A driver's cab 4, a building cover 5, a hydraulic oil tank, a fuel tank (not shown), a counterweight 6, and the like are provided above. The building cover 5 is located between the operator's cab 4 and the counterweight 6, and defines a machine room for accommodating an engine 8, a hydraulic pump 10, and the like to be described later.

The revolving frame 3 of the upper revolving unit 2 is
As shown in FIG. 7, a bottom plate 3A formed of a flat plate material and a pair of left and right vertical plates 3B and 3C which are erected on the upper surface side of the bottom plate 3A and extend forward and backward, respectively. It is configured. The bottom plate 3A extends forward, rearward, left, and right within a virtual circle 7 defined by a constant turning radius R with respect to the turning center O, and the left and right ends are virtual. It is cut so as to form an arc along the circle 7.

Here, the vertical plates 3B, 3C of the revolving frame 3
Is disposed at a position offset to the right by a predetermined dimension with respect to a center line O1-O1 passing through the turning center O, and a front end side thereof constitutes a support bracket of a working device 14 described later. By offsetting the vertical plates 3B and 3C, a mounting space for installing the driver's cab 4 is secured on the front left side of the turning frame 3, and the driver's cab 4 is designed to have a large width and a large living space. I can do it.

On the other hand, a counterweight 6 is detachably attached to the rear end of the bottom plate 3A.
Is arranged on the rear side of the engine 8 and provides a weight balance to the revolving frame 3 with the working device 14. The rear radius of the counterweight 6 is the turning radius R.
And extends in an arc shape along the virtual circle 7 to prevent the counterweight 6 from colliding with a surrounding obstacle or the like during the turning operation of the upper turning body 2.

In order to increase the weight of the counterweight 6 as much as possible, a built-up portion 6 is provided at both left and right ends.
A, 6B, etc. are provided. And the overlay 6
The left overlaid portion 6A of A and 6B is formed so as to slightly protrude forward to avoid an engine support mount 13B described later, and the right overlaid portion 6B is formed on a radiator 1 described later.
2 so as to protrude to the front side so as to avoid them.

Reference numeral 8 denotes an engine as a prime mover provided between the operator's cab 4 and the counterweight 6 and provided on the revolving frame 3. The engine 8 is housed in the building cover 5 and mounted on the revolving frame 3. Engine support mount 1 described later
It is arranged in a horizontal state via 3A to 13D. The output shaft 8A of the engine 8 extends in the width direction (lateral direction) of the turning frame 3, and a flywheel (not shown) is provided at one end thereof.

A flywheel housing 9 made of a rigid material such as a casting is provided at one end of the engine 8, and the flywheel is rotatably accommodated in the flywheel housing 9. Engine 8
A hydraulic pump 10 is provided on one end side of the engine via a flywheel housing 9.
, And discharges the hydraulic oil in the tank as pressure oil.

The engine 8 is provided with a cooling fan 11 at the other end of the output shaft 8A. The cooling fan 11 is driven to rotate by the engine 8, so that the cooling fan 11 moves from the radiator 12 side to the hydraulic pump 10 side. The cooling air flows around the engine 8. A radiator 12 is provided in front of the cooling fan 11.
Is configured to cool the cooling water of the engine 8 by the cooling air.

Reference numerals 13A, 13B, 13C, and 13D denote four engine support mounts.
Reference numerals A to 13D denote mount rubbers or the like for anti-vibration, and support four points of the engine 8 on the turning frame 3 from below, as shown in FIG. The engine support mounts 13A and 13B are disposed apart from each other in front of and behind the hydraulic pump 10, and support the flywheel housing 9 on the revolving frame 3 in a vibration-proof manner. The other engine support mounts 13C and 13D are arranged so as to sandwich the other end of the engine 8 from the front and rear directions, and support the crankcase side of the engine 8 on the revolving frame 3 in a vibration-proof manner.

Here, the engine 8 together with the hydraulic pump 10 and the radiator 12 and the like have a building cover 5 shown in FIGS.
The engine 8 is arranged so as to be as close as possible to the counterweight 6 at the rear side of the revolving frame 3 in order to balance the weight with the working device 14 together with the counterweight 6. The engine 8 is provided with a center line O1 of the turning frame 3 as shown in FIG.
It is arranged so as to be offset to the left side with respect to -O1 so as to secure an installation space for the radiator 12 at the rear right side of the turning frame 3.

Further, a working device 14 is provided on the front side of the upper revolving unit 2 so as to be able to move up and down. The working device 14 includes a boom 15, an arm 16 and a bucket 1 as shown in FIG.
7 and the base end side of the boom 15 is a vertical plate 3 shown in FIG.
B, 3C (support bracket) is pin-connected to the front side so as to be able to move up and down.

The conventional small-swing hydraulic excavator has the above-described configuration. Next, the operation of the conventional excavator will be described.

First, when the hydraulic pump 10 is driven by the engine 8 housed in the building cover 5, the hydraulic pump 10
The hydraulic oil from the motor is used to drive the lower traveling body 1 (not shown).
, It is possible to drive the hydraulic shovel (vehicle) to move forward or backward.

When excavating earth and sand, etc.,
By rotating the bucket 17 while raising and lowering the boom 15 and the arm 16 of the working device 14, the bucket 17 is used to excavate earth and sand. And
At the time of excavation work such as earth and sand by the working device 14, a large load is applied to the front side of the revolving frame 3, so that the revolving frame 3 may receive an external force such that the rear side rises in the direction of arrow A in FIG. is there.

For this reason, a counterweight 6 which is a heavy object is provided on the rear side of the revolving frame 3 so that the weight of the work unit 14 is balanced by the counterweight 6. The engine 8 housed in the building cover 5 is also arranged as close as possible to the counterweight 6 on the rear side of the revolving frame 3 so as to balance the weight with the counterweight 6.

The engine 8 is offset to the left with respect to the center line O 1 -O 1 of the turning frame 3 as shown in FIG. 7 to secure an installation space for the radiator 12 on the rear right side of the turning frame 3. The radiator 12 is made as large as possible so that the cooling function of the engine 8 can be sufficiently exhibited.

Further, in order to realize a small turning within the vehicle width, the upper turning body 2 has a width (2) as shown in FIG.
× R) is formed to have a size equal to or smaller than the vehicle width W (between the left and right crawler belts) of the lower traveling structure 1 and the entire upper revolving structure 2 is accommodated in a virtual circle 7 having a turning radius R as small as possible. I have.

[0021]

By the way, in the above-mentioned small-swing hydraulic excavator according to the prior art, the cab 4, the building cover 5, the counterweight 6 and the like of the upper swing body 2 are placed inside a virtual circle 7 having a turning radius R. Therefore, the counterweight 6 is formed as small as possible, which causes a problem that the weight of the counterweight 6 is insufficient and it is difficult to always sufficiently balance the weight with the working device 15. is there.

That is, in order to fit the counterweight 6 within the imaginary circle 7 having the turning radius R, the rear surface side is formed in an arc-shaped convex curved surface along the turning radius R. It cannot be primed.

On the other hand, on the front side of the counterweight 6,
An engine 8 serving as a drive source of the hydraulic pump 10 is provided,
The engine 8 has four engine support mounts 13A-1A.
Four points are supported on the revolving frame 3 using 3D.
And four engine support mounts 13A to 13D
Is installed on the revolving frame 3 in a state of protruding outward from the engine 8 (flywheel housing 9).

Therefore, as shown in FIG. 7, the engine support mount 13B, the radiator 12 and the left and right overlay portions 6A and 6B provided on the front side of the counterweight 6 are also provided.
In order to avoid the engine support mount 13B, in particular, the overlaid portion 6A on the left side must be formed to avoid the engine support mount 13B.
If it is larger than this, the protrusion size cannot be increased.

Thus, in the prior art, when the working performance of the working device 14 is to be improved, the weight of the counterweight 6 tends to be insufficient, and the turning frame 3 is required when the working device 14 excavates earth and sand. If a large load is applied to the front side of the turning frame 3, there will be a problem that the rear side of the revolving frame 3 rises in the direction of arrow A in FIG.

On the other hand, as another conventional technique, in the field of agricultural tractors and the like, the engine support of a working vehicle is configured such that the engine is mounted on the front side of the vehicle in a three-point support state to enhance the vibration isolation performance of the engine. A structure has been proposed (for example, JP-A-63-275425).

However, in this case, the engine is mounted on the front side of the vehicle because it is an agricultural tractor, and the engine is mounted on the transmission (reduction gear) provided under the seat at the rear side of the vehicle. By transmitting the rotation output,
It is merely a configuration in which wheels such as rear wheels are rotationally driven to travel the tractor.

For this reason, another conventional working vehicle is:
Like a revolving construction machine such as a hydraulic shovel, an upper revolving structure is mounted on a lower traveling structure, a working device is provided on a front side of the upper revolving structure, and a counter weight is provided on a rear side. However, the technical object is different from that of the swing type construction machine.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a large overlay on a counterweight by mounting an engine on a turning frame at three points. The present invention provides a swing type construction machine capable of increasing the weight of a counterweight, increasing the weight balance with respect to a working device, and improving working performance and the like.

[0030]

Means for Solving the Problems To solve the above-mentioned problems, a structure adopted by the invention of claim 1 is a lower traveling body, and mounted on the lower traveling body so as to be capable of turning, and mounted on a revolving frame. A swivel-type construction machine, comprising: an upper slewing body provided with a cab, a building cover and a counterweight, and a working device that is located on the front side of the upper slewing body and is rotatably provided on the revolving frame; An engine serving as a drive source of a hydraulic pump is housed in a building cover of the upper revolving unit, and the engine is mounted on the revolving frame in a three-point support state.

With this structure, the three-point supported engine can reduce the installation space of the engine as compared with the conventional four-point supported engine, and the engine is compactly arranged on the turning frame. be able to.

On the other hand, according to the invention of claim 2, the upper revolving unit is configured to accommodate the revolving frame, the cab, the building cover and the counterweight within a circle having a predetermined turning radius,
The engine is configured to be mounted on the revolving frame at a position close to the front side of the counterweight with three points supported.

With this configuration, the turning radius of the upper-part turning body is reduced, the size of the counterweight is reduced, and the space for installing the engine is reduced even when the engine and the counterweight are arranged close to the front side. Since the counterweight can be made smaller, the counterweight can be formed so as to protrude largely toward the engine on the turning frame, and the weight of the counterweight can be increased within a circle having a predetermined turning radius.

According to the third aspect of the present invention, the engine is configured to be vibration-isolated and supported using a total of three engine support mounts on the revolving frame. As a result, the engine can be vibration-isolated and supported using the three engine support mounts, and the engine installation space on the turning frame can be reduced.

According to the invention of claim 4, the hydraulic pump is provided on one side in the longitudinal direction of the engine via a flywheel housing, and the first engine support mount of the three engine support mounts is the hydraulic pump. And the second and third engine support mounts are located on the other side of the engine and are mounted between the engine and the turning frame. And

Thus, the first engine support mount can be disposed below the hydraulic pump, and does not protrude outward from the flywheel housing of the engine.

According to the fifth aspect of the present invention, the engine is disposed between the operator's cab and the counterweight, and the output shaft is disposed in a horizontal state so as to extend leftward and rightward of the turning frame. Is provided on one side in the longitudinal direction of the engine via a flywheel housing, and between the revolving frame and the engine, a first position is located below the hydraulic pump and attached to the flywheel housing.
An engine support mount, and a second and a second rearwardly located front and rear sides of the revolving frame located on the other side of the engine.
A third engine support mount is provided.

This makes it possible to reduce the installation space for the engine disposed horizontally on the revolving frame between the operator's cab and the counterweight, and accordingly, the large weight is provided on the front side of the counterweight. A stake can be applied to increase the weight of the counterweight.

Further, according to the invention of claim 6, the counterweight is provided with a built-up portion protruding toward the flywheel housing and the hydraulic pump. With this, as the installation space for the engine on the revolving frame is reduced, the build-up portion provided on the front side of the counterweight can largely protrude toward the flywheel housing and the hydraulic pump.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small swing hydraulic excavator will be described as an example of a swing construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 21 denotes a counterweight provided on the rear end side of the turning frame 3.
Is substantially the same as the counterweight 6 described in the related art, and is formed so that its rear surface side extends in an arc along a virtual circle 7 having a turning radius R. In addition, on the front side of the counterweight 21, overlaid portions 21A and 21B for increasing the weight as much as possible are provided left and right apart from each other.

However, in the counterweight 21 according to the present embodiment, the left one of the overlaid portions 21A and 21B has a flywheel housing 23 and a hydraulic It is formed so as to protrude greatly to the front side up to a position close to the pump 24. Further, the right overlay 21B is formed so as to protrude forward so as to partially cover a radiator 26 described later from the rear. And, these overlay 21
A and 21B extend in the vertical direction over almost the entire height of the counterweight 21 as shown in FIG.

Reference numeral 22 denotes an engine as a prime mover positioned between the operator's cab 4 and the counterweight 21 and placed horizontally on the revolving frame 3. The engine 22 is substantially the same as the engine 8 described in the prior art. A hydraulic pump 24 is provided at one end of the hydraulic pump 24 via a flywheel housing 23. On the other end of the engine 22, a cooling fan 25 that is driven to rotate by the output shaft 22A, a radiator 26, and the like are provided.

Reference numerals 27A, 27B, and 27C denote first, second, and third engine support mounts for supporting the engine 22 in vibration isolation. The engine support mounts 27A to 27C are engine support mounts 13A to 13D described in the related art. The engine support mounts 27 </ b> A to 27 </ b> C support the engine 22 on the swivel frame 3 at three points from the lower side, though it is constituted by a mount rubber and the like for vibration isolation almost in the same manner as described above.

Here, the engine support mounts 27A-2
7C, the first engine support mount 27A is located below the hydraulic pump 24, and is mounted between the flywheel housing 23 and the revolving frame 3 by a mounting bracket 2 described later.
It is attached via 8,29. In addition, the second and third
The engine support mounts 27B and 27C of the engine 2
The crankcase 22B side of the engine 22 is supported on the revolving frame 3 in a vibration-proof manner, as shown in FIG.

The engine 22 is housed in the building cover 5 together with the hydraulic pump 24 and the radiator 26 as described in the related art, and the turning frame 3 is used to balance the weight of the working device 14 with the counterweight 21. The rear side is disposed so as to be as close as possible to the front side of the counterweight 21. 1 and 2, the engine 22 is arranged to be offset to the left with respect to the center line O1-O1 of the turning frame 3,
The arrangement space for the radiator 26 is secured on the rear right side of the turning frame 3.

Reference numeral 28 denotes a mounting bracket provided on the revolving frame 3 below the hydraulic pump 24, and 29 denotes another mounting bracket for holding the first engine support mount 27A between the mounting bracket 28 and the mounting bracket 28. The mounting bracket 29 is formed as an L-shaped bracket as shown in FIGS. 3 and 4, and its base end is fixed to the flywheel housing 23 using bolts or the like. The distal end of the mounting bracket 29 is a free end that extends substantially below (in the horizontal direction) the bottom plate 3A of the revolving frame 3 below the hydraulic pump 24.

As shown in FIGS. 3 and 4, an engine support mount 27A is detachably mounted between the tip end of the mounting bracket 29 and the upper end of the mounting bracket 28 by bolts or the like. The mount 27A supports the engine 22 through a flywheel housing 23 in a vibration-proof manner.

Further, the second and third engine support mounts 27B and 27C are also mounted on the engine 22 by the mounting brackets 30 and 30 before and after standing from the bottom plate 3A of the revolving frame 3.

The small-turn hydraulic excavator according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

In this embodiment, however, the engine 22 is mounted between the cab 4 and the counterweight 21 on the revolving frame 3 and the first to third engine support mounts 2 are mounted.
7A to 27C are used to support three points in a horizontal state.

Then, the first engine support mount 27
A is attached between the flywheel housing 23 and the revolving frame 3 below the hydraulic pump 24,
The third engine support mounts 27B and 27C are arranged at the other end of the engine 22 so as to be spaced apart from the front and rear of the crankcase 22B.

Therefore, the first engine support mount 2
7A can be installed below the hydraulic pump 24, and can be prevented from protruding outside the flywheel housing 9 like the engine support mounts 14A and 14B shown in FIG. Thereby, the installation space for the engine 22 can be reliably reduced, the engine 22 can be compactly arranged on the revolving frame 3, and the layout design in the building cover 5 can be performed with a high degree of freedom. .

Therefore, according to the present embodiment, the mounting space of the engine 22 can be reduced by mounting the engine 22 on the revolving frame 3 at three points, and accordingly, the front side of the counterweight 21 can be reduced. , Large overlaid portions 21A and 21B can be formed.

That is, of the overlay 21A, 21B provided on the front side of the counterweight 21, the left overlay 2
1A to the flywheel housing 23 and the hydraulic pump 2
4 and can be formed so as to protrude greatly toward the front side, and the overlaid portion 21A can be extended vertically over substantially the entire height of the counterweight 21.

As a result, the rear surface of the counterweight 21 is formed to extend in an arc along the imaginary circle 7 having the turning radius R, without impairing the function of reducing the turning radius R.
The weight of the counterweight 21 is increased by the overlaid portion 21 on the front side.
A, 21B.

Thus, even when a large load is applied to the front side of the upper revolving unit 2 by the working device 14, the weight balance with respect to the working device 14 can be increased by the counterweight 21 on the rear side, so that it can be used during excavation work or the like. The vehicle stability can be kept good, and the work performance and reliability can be reliably improved.

In the above embodiment, the upper revolving unit 2
The cab 4, the building cover 5, the counterweight 21, and the like are described as an example of a small turning hydraulic excavator in which the configuration is accommodated in a virtual circle 7 having a turning radius R, but the present invention is not limited to this. For example, even in the case of a medium-sized or large-sized hydraulic excavator, the engine installation space can be reduced by using a three-point support structure on the revolving frame, and the layout design and the like in the building cover can be improved. It can be performed with a degree of freedom.

In the above-described embodiment, the engine 22 is disposed horizontally on the turning frame 3, and the flywheel housing 23 and the hydraulic pump 24 are provided at one end of the engine 22 behind the cab 4. Although the case where the cooling fan 25 and the radiator 26 are provided on the other end side of the engine 22 has been described as an example, the present invention is not limited to this. , A cooling fan, a radiator, and the like may be provided, and a flywheel housing, a fuel pump, and the like may be provided on the other end side.

The engine does not necessarily need to be disposed horizontally on the revolving frame. For example, a hydraulic excavator of a type in which the engine is disposed vertically in front of the counterweight so as to extend substantially parallel to the cab. Also, in this case, the engine can be installed in a three-point support structure on the revolving frame, so that the installation space for the engine can be reduced, and the layout design and the like in the building cover can be designed with a high degree of freedom. Is what you can do.

Further, in the above-described embodiment, a description has been given by taking a hydraulic excavator as an example. However, the present invention is not limited to this, and may be applied to, for example, a dredger having a revolving superstructure on a hull. Alternatively, the present invention may be applied to a swing type construction machine having an upper swing body such as a self-propelled crane.

[0062]

As described in detail above, according to the first aspect of the present invention, the engine is mounted on the revolving frame in a three-point support state. As a result, the installation space for the engine can be reduced, and the engine can be compactly arranged on the turning frame. Therefore, it is possible to form a large build-up on the front side of the counterweight, and it is possible to increase the weight of the counterweight, increase the weight balance with respect to the working device, and improve the work performance and the like.

According to the second aspect of the present invention, the revolving frame of the upper revolving unit, the cab, the building cover and the counterweight are accommodated in a circle having a predetermined turning radius, and the engine in the building cover is operated by the counterweight. The structure supports three points on the revolving frame at a position close to the front side of the revolving frame. Therefore, even if the revolving radius of the upper revolving unit is reduced and the counterweight is reduced in size, the engine installation space can be reduced. Accordingly, the counterweight can be formed so as to protrude largely toward the engine on the revolving frame. Therefore, the weight of the counterweight can be reliably increased within the range of the predetermined turning radius, and the weight balance with respect to the working device can be increased.
Work performance and the like can be improved.

According to the third aspect of the present invention, the engine is mounted on the revolving frame by using a total of three engine support mounts for anti-vibration support. The engine installation space can be reduced, and the degree of freedom in layout design within the building cover can be increased.

According to the fourth aspect of the present invention, a hydraulic pump is provided at one end in the longitudinal direction of the engine via a flywheel housing, and the first engine support mount of the three engine support mounts is provided with a hydraulic pump. It is located below the pump and mounted between the flywheel housing and the swivel frame, and the second and third engine support mounts are located at the other end of the engine and mounted between the engine and the swivel frame. Therefore, the first engine support mount can be disposed below the hydraulic pump, and the engine support mount can be prevented from protruding outward from the flywheel housing of the engine.

According to the fifth aspect of the present invention, the engine is disposed horizontally between the cab and the counterweight, and the hydraulic pump is provided on one side of the engine via a flywheel housing. A first engine support mount mounted on a flywheel housing located below the hydraulic pump between the swivel frame and the engine; and a first engine support mount located on the other side of the engine and in front of the swivel frame. Since the second and third engine support mounts are separated from each other in the rear direction, the installation space for the engine can be reduced, and accordingly, the counterweight is provided with a large padding on the front side. ,
The weight of the counterweight can be reliably increased.

Further, in the invention according to the sixth aspect, since the padding protruding toward the flywheel housing and the hydraulic pump is provided on the front side of the counterweight, the engine is mounted on the revolving frame. With the reduced installation space, the built-up portion provided on the front side of the counterweight can be greatly protruded toward the flywheel housing and the hydraulic pump side, and the weight of the counterweight can be reliably increased, The weight balance with respect to the working device can be increased, and the working performance and the like can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a counterweight, an engine, and the like provided on a turning frame of a hydraulic shovel according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a counter weight, an engine, and the like in FIG. 1;

FIG. 3 is a cross-sectional view showing a revolving frame, an engine, an engine support mount, and the like, as viewed from a direction indicated by arrows III-III in FIG.

FIG. 4 is a cross-sectional view showing a turning frame, an engine, an engine support mount, and the like, as viewed from a direction indicated by an arrow IV-IV in FIG.

FIG. 5 is a front view showing a conventional hydraulic excavator.

6 is a plan view of the excavator shown in FIG.

FIG. 7 is an enlarged plan view showing a counterweight, an engine, and the like provided on a turning frame in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Revolving frame 4 Operator's cab 5 Building cover 7 Virtual circle 14 Work device 21 Counter weight 21A Overlay portion 22 Engine 22A Output shaft 23 Flywheel housing 24 Hydraulic pump 25 Cooling fan 26 Radiator 27A First Engine support mount 27B second engine support mount 27C third engine support mount O center of rotation R radius of rotation

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shinichi Sato 650, Kandachicho, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. 3D035 CA01 CA11 CA19

Claims (6)

[Claims] 1. An undercarriage, an upper revolving structure which is pivotally mounted on the undercarriage and has a driver's cab, a building cover and a counterweight provided on a revolving frame, and a front side of the upper revolving structure. A revolving construction machine comprising a working device positioned and rotatably provided on the revolving frame, wherein an engine serving as a drive source of a hydraulic pump is housed in a building cover of the upper revolving unit, and the engine is A swiveling construction machine, wherein the swiveling construction machine is configured to be mounted on the swivel frame in a three-point support state. 2. The revolving superstructure includes a structure in which the revolving frame, a cab, a building cover, and a counterweight are accommodated within a circle having a predetermined turning radius, and the engine is located at a position close to a front side of the counterweight. The turning type construction machine according to claim 1, wherein the turning type construction machine is configured to be mounted on the turning frame in a three-point supporting state. 3. The revolving construction machine according to claim 1, wherein the engine is configured to support the vibration isolation using a total of three engine support mounts on the revolving frame. 4. The hydraulic pump is provided on one side of a length direction of the engine via a flywheel housing,
A first engine support mount of the three engine support mounts is located below the hydraulic pump and is mounted between the flywheel housing and a turning frame, and a second and third engine support mounts are provided on the hydraulic pump. The turning type construction machine according to claim 3, wherein the turning type construction machine is configured to be mounted on the other side of the engine and between the engine and the turning frame. 5. The engine is located between the operator's cab and the counterweight, and is disposed in a horizontal state so that an output shaft extends leftward and rightward of the turning frame. A first engine support mounted on the flywheel housing at a position below the hydraulic pump between the revolving frame and the engine, on one side in a length direction of the flywheel housing; 3. The revolving construction machine according to claim 1, wherein a mount and second and third engine support mounts located on the other side of the engine and separated in front and rearward of the revolving frame are provided. . 6. The revolving construction machine according to claim 4, wherein the counterweight is provided with a built-up portion protruding toward the flywheel housing and the hydraulic pump.