JP2002256594A - Construction machine with suspension ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine with a suspension ring capable of facilitating ordinary maintenance and inspection for an engine from the ground and preventing the appearance from being impaired by the exposure of the suspension ring. SOLUTION: A hydraulic backhoe with a suspension ring as a construction machine is provided with a recessed part 34 formed in the center of the top face of a counterweight 32, a cover part 38 formed by extending an opening and closing hood 36 of an engine room to cover the recessed part 34, and a pair of suspension rings 44 provided at the bottom of the recessed part 34 and used in entirely suspending the hydraulic backhoe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic excavator, and more particularly, to a construction machine having a suspension ring for lifting a construction machine with a crane or the like.

[0002]

2. Description of the Related Art For example, in the case of a hydraulic excavator whose upper revolving structure has a relatively low height above the ground, if daily maintenance and inspection of an engine mounted on the upper revolving structure can be performed from the ground, work is required. The operator does not need to climb on the upper revolving superstructure every time the maintenance is performed, and the maintenance and inspection work is facilitated.

[0003] To this end, a recess is formed in a part of the counterweight provided at the rear end of the upper revolving structure, that is, in the center of the upper surface, and the recess is formed into the engine, that is, into the engine room through the recess. On the other hand, a cover is formed by extending an opening / closing hood provided on the upper surface of the engine room so as to be openable and closable in an up-down direction. It is conceivable to close the place.

[0004] In the above-described configuration, by opening the opening / closing hood upward, the engine room can be accessed through the recess of the counterweight, that is, the engine can be accessed. It can be carried out.

[0005]

By the way, the above-mentioned relatively small hydraulic excavator can be mounted not only with a digging bucket but also with a ripper, a breaker, a crusher and the like on its front attachment. Therefore, this type of hydraulic excavator can be applied not only to digging work but also to crushing of buildings and rocks, etc. In many cases, it is not possible.

In this case, the hydraulic excavator is lifted by a wire rope with a crane or the like, and is transported to the work site. For this purpose, a hydraulic excavator is provided with a suspension ring for hanging the wire rope. It is necessary to keep. Generally, such a suspension ring is generally mounted on the upper surface of the counterweight in consideration of strength, balance, and the like.However, as described above, in a counterweight of a type having a recess as described above, Since the cover portion of the opening / closing hood exists at the center of the upper surface, the mounting space for the suspension ring is left only at both ends of the counterweight.

When the counterweight is a can made of concrete filled therein, a large amount of reinforcing material is required for the counterweight in order to fix the suspension ring.
The structure of the counterweight becomes complicated, resulting in high cost.
Also, when the counterweight is a cast product, the attachment of the suspension ring to the counterweight is easy,
However, the manufacturing cost of the cast counterweight is higher than that of the canned product.

Further, regardless of whether the counterweight is made of a can or a cast product, if suspension rings are attached to both ends of the counterweight, the suspension rings are always protruding from the counterweight. Will impair the appearance. The present invention has been made on the basis of the above-described circumstances, and the object thereof is to enable a daily maintenance and inspection of an engine from the ground, and to provide a suspension ring without impairing the external appearance. It is an object of the present invention to provide a construction machine with a suspension ring that can use a counterweight of a can-made product without reinforcing the structure so that the structure becomes complicated.

[0009]

In order to achieve the above object, a construction machine with a suspension ring according to the present invention (claim 1) is provided at a rear portion of a swivel base on a running body, and includes a running body, a swivel base and The engine room, which is the power source for the front attachment for work, is housed.The engine room has an open rear surface, the counterweight is fixed to the rear end of the swivel, and closes the rear opening of the engine room. A recess formed to allow access to the engine in the engine room, and provided on the upper surface of the engine room so as to be openable and closable in an up-down direction, and when closed, closes the recess, and an outer surface of the counterweight. An opening / closing hood having a cover part that is a part of the opening hood, which opens a region from the recess to the upper surface of the engine compartment when opened.
A plurality of suspension rings provided in the recess.

According to the above construction machine with a suspension ring, by opening the opening and closing hood, the engine in the engine room can be accessed from the ground through the recess of the counterweight,
Daily maintenance of the engine is possible. On the other hand, when the opening / closing hood is closed, the opening / closing hood hides the hanging ring from the outside and opens the opening / closing hood, so that the hanging ring can be used.

Preferably, the opening and closing hood is provided with an opening which can be opened and closed, and the wire rope connected to the suspension ring can be led out through the opening. The existence of such an opening enables the use of the suspension ring without opening the opening / closing hood. The counterweight has a mounting portion on the frame of the swivel base, and the suspension ring has one end connected to the mounting portion and the other end integrally attached to a connecting member extending from the inside of the counterweight to the recess. It is desirable that this be done (claim 3). In this case, the weight of the construction machine working on the suspension ring when lifting the construction machine is
Through the connecting member provided integrally with the suspension ring, since it will work on the mounting portion of the counterweight that is firmly formed, even if the counterweight as a can-made product does not require complicated reinforcement, A suspension ring can be provided.

[0012]

FIG. 1 shows a hydraulic excavator as a construction machine. The hydraulic excavator includes, for example, a crawler-type lower traveling body 2 and an upper revolving body 4 provided on the lower traveling body 2, and the upper revolving body 4 has a revolving base 6 at a lower portion thereof. A cabin 8 for driving operation is installed on the left side of the swivel 6 at the front thereof, and a work attachment 10 is provided on the right side thereof.
More specifically, the front attachment 10 is
A boom 12 having a base end pivotally supported so as to be able to move up and down, and an arm 14 rotatably connected to a distal end of the boom 12.
And an excavating bucket 16 rotatably connected to the tip of the arm 14.
The excavating bucket 16 is operable via a boom cylinder 18, an arm cylinder 20, and a bucket cylinder 22, which are hydraulic cylinders. Note that a ripper, a breaker, a crusher, and the like can be attached to the tip of the arm 14 instead of the excavation bucket 16.

On the other hand, an engine room 24 is installed at the center of the rear part of the swivel 6, and
Utility boxes 26 are provided on both the left and right sides of 4, respectively. The rear of the engine room 24 opens,
The engine 28 (see FIG. 3) is housed therein. FIG. 1 shows the engine 2 projecting from the engine room 2.
Only eight exhaust pipes 30 are shown.

Further, a counterweight 32 is disposed at the rear side of the engine room 24, and the counterweight 32 closes a rear opening of the engine room 24,
And both ends are left and right utility boxes 2
It is curved so as to go around the 6 side. The upper surface of the counterweight 32 is at the same height level as the upper surfaces of the engine room 24 and the utility box 26.

As is apparent from FIG. 2, a concave portion 34 is formed at the center of the upper surface of the counterweight 32, and the concave portion 34 expands upward to form a U-shape. Normally, when the opening / closing hood 36 of the engine room 24 is closed, the recess 34 is closed by a cover 38 of the opening / closing hood 36, and the cover 38 forms a part of the outer surface of the counterweight 32. ing.

More specifically, the opening / closing hood 36 extends the upper surface of the engine room 24 from the cabin 8 side toward the counterweight 32, and a base end located on the cabin 8 side is provided with a hinge 40 (see FIG. 5). Engine room 2
4 is connected to the upper surface. Therefore, the opening and closing hood 3
Numeral 6 is rotatable up and down around the hinge 40, that is, can be opened and closed. Further, when the opening / closing hood 36 is in a closed state, the above-mentioned cover portion 38 is positioned rearward from the upper surface of the engine room 24 (the upper surface of the counterweight 32)
To cover the recess 34. That is, the cover portion 38 has a shape that compensates for the missing portion of the counterweight 32 due to the recess 34. Also, the cover part 38
Is provided with a key lock mechanism 42. The key lock mechanism 42 can hold the opening / closing hood 36 in a closed state by engaging a latch of the key lock mechanism 42 with a striker (not shown) on the recess 34 side.

When the opening / closing hood 36 is opened as shown in FIG. 3, the opening / closing hood 36 is
4 to open the area from the top of the engine room 24,
As a result, the operator can work with the recess 34 of the counterweight 32.
, The engine 28 in the engine room 24 can be accessed, and daily maintenance of the engine 28 can be performed from the ground. Therefore, the operator does not need to climb on the upper swing body 4 every time the maintenance of the engine 28 is performed, and the maintenance and inspection are facilitated. A rod rest (not shown) is attached to the inner surface of the opening / closing hood 36, and the opening / closing hood 36 can be held in an open state by the rod rest. 2 and 3, the above-mentioned front attachment 10 is omitted.

As shown in FIG. 3, a pair of left and right suspension rings 44 are provided in the recess 34 of the counterweight 32 so as to project therefrom. When the opening and closing hood 36 is closed, the suspension rings 44 are provided. 36, the suspension ring 44 does not impair the appearance of the hydraulic excavator. As shown in FIG. 4, the counterweight 32 is a can-made product in which a filler such as concrete is filled, and a frame 4
6 has a concave mounting portion 47 serving as a mounting portion. The mounting portion 47 is a portion that transmits the weight of the counterweight 32 to the frame 46, and is thus firmly configured. The left and right suspension rings 44 provided in the recess 34 are provided inside the counterweight 32, and are provided integrally with the other end of a plate-shaped connection member 48 having one end connected to the mounting portion 47. I have. The frames 46 extend in parallel with each other, and together with a plurality of cross members (not shown) connecting the frames 46 constitute a basic structure of the swivel 6.

Further, as shown in FIG.
An opening 50 is formed at an appropriate position in the opening, and the opening 50 extends in the width direction of the opening / closing hood 36, and is normally closed by a lid 52. As shown in FIG. 5, the front end of the lid 52 is attached to the upper surface of the opening / closing hood 36 via a pair of hinges 54, and the opening 52 can be opened by rotating about the hinges 54. Further, the rear end edge of the lid 52 can be locked to the opening / closing hood 36 via a pair of stoppers 56 provided on the upper surface of the opening / closing hood 36, whereby the closed state of the lid 52 is maintained.

Further, an opening 58 is formed in the opening / closing hood 36, and the exhaust pipe 30 of the engine 28 can protrude outward from the engine room 24 through the opening 58 when the opening / closing hood 36 is in a closed state. FIG. 6 shows a state immediately before the hydraulic excavator is lifted by the crane via the wire rope 60. For example, the wire rope 60 is wrapped around the bent portion of the boom 12 via the pad 64 from below, then passes through the hook 62 of the crane, and the hooks (not shown) at both ends are hooked on the suspension ring 44. Have been. At this time, the lid 52 of the opening / closing hood 36
Is in an open state, which allows the wire rope 60
Passes through the opening / closing hood 36 through the opening 50, and
4 has been led.

According to such a rope hanging of the wire rope 60, the excavator can be lifted, that is, a so-called roll-up can be performed without opening the opening / closing hood 36, and the excavator can be moved to a work site which cannot be reached by itself. Can be transported. The wire rope 60 can be hung with the opening / closing hood 36 opened.

When the hydraulic shovel is rolled up, the weight of the hydraulic shovel acts on the mounting portion 47 of the counterweight 32 which is firmly formed from the suspension ring 44 via the connecting member 48. Therefore, complicated reinforcement is not required, and an inexpensive can-made product can be used for the counterweight 32. The present invention is not limited to the above embodiment, and various modifications are possible. For example, the suspension ring 44 does not need to project from the bottom of the recess 34 in the counterweight 32, and may be provided so as to be embedded in the bottom. Further, the counterweight 32 does not necessarily have to be a can-made product, but may be a cast product. In this case, the suspension ring 44 can be directly fixed to the bottom of the recess of the cast counterweight.

Further, the present invention is not limited to the excavator,
The present invention is applicable to various construction machines that require a suspension ring.

[0024]

As described above, according to the construction machine with a suspension ring of the present invention (claim 1), the suspension ring is provided in the recess of the counterweight, so that the daily maintenance and inspection of the engine can be performed on the ground. On the other hand, the suspension ring can be hidden by the cover of the opening / closing hood at normal times, so that the suspension ring does not impair the appearance of the construction machine.

If the opening / closing hood is provided with an openable / closable opening through which the wire rope passes (claim 2), the wire rope can be hung without opening the opening / closing hood. Further, when the suspension ring is connected to the mounting portion of the counterweight via the connecting member (Claim 3), when the construction machine is lifted using the suspension ring, the weight of the construction machine is reduced by a strong counter. It can be received on the weight mounting part, and does not require complicated reinforcement, even if it is a counterweight for canned goods.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator according to one embodiment.

FIG. 2 is a rear view of the excavator of FIG. 1;

FIG. 3 is a rear view of the excavator in a state where an opening / closing hood of an engine room is opened.

FIG. 4 is a view in which a counterweight is partially cut away.

FIG. 5 is a plan view of an engine room and a counterweight.

FIG. 6 is a diagram showing a state immediately before the hydraulic excavator is suspended in a circle.

[Explanation of symbols]

 2 Lower traveling structure 4 Upper revolving structure 6 Revolving base 10 Front attachment 24 Engine room 28 Engine 32 Counter weight 34 Recess 36 Opening / closing hood 38 Cover part 44 Hanging ring 46 Frame 47 Placement part 50 Opening 52 Lid

Continued on the front page (72) Inventor Minoru Fukuyama 650, Kandate-cho, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D015 CA03 FA01

Claims (3)

[Claims] 1. An engine room, which is provided at a rear portion of a swivel base on a running body and houses an engine serving as a power source of the running body, the swivel base and a front attachment for work, and has an open rear surface; A counterweight fixed to a rear end of the swivel base and closing a rear opening of the engine room; a recess formed at an upper center of the counterweight to enable access to the engine in the engine room; A cover portion which is provided on the upper surface of the room so as to be openable and closable in a vertical direction, closes the recess when closed, and becomes a part of an outer surface of the counterweight; An opening / closing hood for opening a region reaching the upper surface of the vehicle, and a plurality of suspension rings provided in the recess. Set machine. 2. An opening / closing hood provided on the opening / closing hood,
The construction machine with a suspension ring according to claim 1, further comprising an opening for guiding a wire rope connected to the suspension ring to the outside. 3. The counterweight has a mounting portion on the frame of the swivel table, and the suspension ring has one end connected to the mounting portion and the other end extending from the counterweight into the recess. The construction machine with a suspension ring according to claim 1 or 2, wherein the construction machine is integrally attached to the connection member.