JP2003336284A - Revolving body for construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a revolving body for construction equipment, which is excellent in design while maintaining a suitable contour of a counterweight, required depending on the function of the construction equipment. <P>SOLUTION: The revolving body 4 is formed of a driving cab 10, the counterweight 20, an openable door 22 arranged between the driving cab and the counterweight, a protruding portion 24 formed in one body with the counterweight 20 in a manner protruding upward from the door 22, and a cover member 32 arranged over the door 22. According to the revolving body 4 thus formed, the cover member 32 is extended from the protruding member 24 in a longitudinal direction, and defines a side portion of an engine room 18 in cooperation with the door 22. In this manner, the mass and contour of the counterweight 20 are set as appropriate without extremely extending the length of the protruding portion 24. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving structure for a construction machine, and more particularly to a revolving structure for a construction machine capable of reducing a turning radius in the rear.

[0002]

2. Description of the Related Art As described in, for example, Japanese Patent Application Laid-Open No. 9-88125, in a revolving structure intended to realize a small turning radius in the rear, the counterweight has a rear end in plan view. The edge is formed in an arc shape, and
In order to secure the necessary mass, the end often wraps around the side surface of the revolving structure and projects forward. The revolving structure has a structure in which the engine room can be opened to the side in order to facilitate the maintenance work of the engine mounted in the engine room. It is done through the opening (window) of the opened door. For this reason, as described in the above publication, the counterweight wraps around the side surface so that the end portion avoids the opening of the door, and the upper and lower parts sandwiching the opening protrude the corners forward. There are cases where it becomes a different form.

With such a counterweight configuration, a small turning radius at the rear of the revolving superstructure can be realized, and stability of the revolving superstructure, smooth operability of the front working mechanism, maintainability of the engine, and the like can be well secured. ing.

[0004]

By the way, the mass of the counterweight is originally determined according to the function of the front working mechanism or the like. In this case, since the size of the above-mentioned protruding portion at the end portion is set on the basis of the mass of the counterweight, the protruding portion may not be suitable for the vehicle body design.

On the other hand, even if it is attempted to set the size of the projecting portion while giving priority to the design, if the projecting portion becomes too long, it is difficult to manufacture because the projecting portion tends to be distorted particularly when casting the counterweight. Become. Therefore, if the counterweight is forcibly adapted to the design, there is a problem that the manufacturing cost increases.

[0006] Therefore, an object of the present invention is to provide a revolving structure for a construction machine capable of achieving compatibility with the design of the construction machine while maintaining the form of the counterweight required according to the function. It is a thing.

[0007]

In order to solve the above problems, the present invention (Claim 1) includes a main frame mounted above a traveling body through a turning device and supporting a cab and a working mechanism. , The engine room on the main frame, which is arranged behind the driver's cab and the working mechanism, and which houses the engine serving as the power source of the traveling body and the working mechanism, and the rear of the main frame, which separates the rear of the engine room. In a revolving superstructure of a construction machine including a counterweight, the revolving superstructure is provided on at least one side surface of the revolving superstructure to partition a side of the engine room between a driver's cab and a counterweight, while directing the engine room to the side. And a door that can be opened, and a projecting shape that is integrally formed at the end of the counterweight and that projects upward from the end along one side surface of the revolving structure from the end. , It is disposed above the door, extending in the longitudinal direction of the turning body continuous with the projecting shape portion, and, characterized in that a cover member for partitioning the side of the engine compartment along with the door.

According to the above revolving structure, since the cover member is arranged so as to be continuous with the protruding shape portion of the counterweight, the shape of the counterweight can be set regardless of compatibility with the vehicle body design. For this reason, the mass and shape of the counterweight can be easily set according to the function of the working mechanism, and a compact revolving structure suitable for the small rear swing type can be obtained.

Further, the above-mentioned cover member may have a vent for communicating the inside of the engine room with the outside air (claim 2). In this case, the cooling of the engine can be promoted by introducing the outside air into the engine room through the ventilation port or releasing the heat inside the engine room to the outside air.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a hydraulic excavator as an example of a construction machine. The hydraulic excavator includes, for example, a crawler type traveling body 2 and a revolving structure 4 provided above the traveling body 2. The revolving structure 4 has a main frame 6, and the main frame 6 is supported on the traveling structure 2 via a revolving device 8. Also, the mainframe 6
A driver's cab 10 and a front working mechanism 12 operated from the driver's cab 10 are provided above. The front working mechanism 12 includes a boom 14, an arm and a bucket (not shown), and a hydraulic cylinder 16 for operating them.

On the main frame 6, the cab 10
An engine room 18 is arranged behind the front work mechanism 12, and an engine 19 is housed in the engine room 18 as shown in FIG. A counterweight 20 is provided at the rear of the main frame 6.
Is arranged, and the counterweight 20 partitions the rear of the engine room 18.

A door 22 is provided on one side surface (left side in FIGS. 1 and 2) of the revolving structure 4, and the door 22 partitions the side of the engine room 18. Also, the door 2
2 can be opened and closed laterally via a hinge (not shown), and by opening this door 22, the engine room 18
Is opened to the side, and the inside of the engine room 18 can be accessed through the opening.

Further, as shown in FIG. 2, the counterweight 20 has a rear end edge formed in an arc shape, and both end portions thereof are formed so as to wrap around the side surface of the revolving structure 4 when viewed in the width direction thereof. On the other hand, the above-mentioned door 2 is provided on one side surface of the revolving structure 4.
As shown in FIG. 1, one end portion (left side in FIG. 1) of the counterweight 20 wraps around sideways so as to avoid the door 22, and sandwiches the door 22 so that a pair of upper and lower portions are provided. Projected portions 24 and 26 are formed.
The protruding portions 24 and 26 extend above and below the door 22 along the side surface of the revolving structure 4.

A door 28 is also provided on the other side surface (right side in FIG. 2) of the revolving structure 4 as shown in FIG.
Projecting portions 30 are formed on the upper and lower sides of the door 28, respectively. The door 28 partitions the side of the engine room 18, while opening the side allows the engine room 18 to be opened. As described above, the revolving structure 4 can easily perform the maintenance work of the engine 19 and the like by opening the doors 22 and 28.

A cover member 32 is arranged above the door 22, and the cover member 32 extends in the front-rear direction of the revolving unit 4 so as to be continuous with the protruding portion 24. Here, FIG.
As shown in FIG. 5, the opening length A of the door 22 is ensured to be large enough to facilitate access to the inside of the engine room 18, while the protruding length B of the protruding shape portion 24 is the counterweight. Since it is set based on the mass of 20, the length of the revolving structure 4 is not always equal to the length A,
B does not match each other. Therefore, the cover member 32 described above compensates for the shortage of the protruding length B of the protruding portion 24 with respect to the opening length A of the door 22. Since the tank 31 is disposed in front of the door 28 on the opposite side, the opening length of the door 28 is set to be substantially the same as the length of the protruding shape portion 30.

FIG. 3 specifically shows the attachment of the door 22 and the cover member 32. The door 22 has the base end edge of the counterweight 20 through the two hinges 34.
And the two hinges 34 are arranged one above the other. A latch 36 is attached to the inner surface of the door 22, and the door 22 is fixed at the closed position by engaging the latch 36 with a striker (not shown).

On the other hand, the cover member 32 is formed in a box shape by combining a plurality of plate members, and the cover member 32 is seen in the front-rear direction of the revolving unit 4 and has a pair of brackets 38 on both sides.
Has 40. These brackets 38 and 40 face each other, and one of the brackets 38 (rear side in FIG. 3) is used.
Is bolted to the protruding shape portion 24. As shown in detail in FIG. 4, the outer surface of the cover member 32 is formed in a curved shape, and therefore the cover member 32 conforms to the outer surface shape of the protruding shape portion 24 shown in FIG. The outer surface of the door 22 is also formed in conformity with the side surface shape of the counterweight 20 shown in FIG. Therefore, the above-mentioned cover member 32 partitions the side of the engine room 18 above the door 22 and realizes the design consistency between the counterweight 20 and the door 22 on the side surface of the revolving structure 4.

As shown in FIGS. 4 and 5, the lower projecting shape portion 26 has an outer shape that matches the cross-sectional shape of the side frame 44, and the lower projecting shape portion 26 also corresponds to the revolving structure 4. The design integrity of is achieved. Also,
A large number of vent holes 42 are formed in the cover member 32, and these vent holes 42 are arranged in the front-rear direction of the revolving unit 4. Each vent 42 has a vertically long rectangular shape,
As shown in FIG. 4, the opening area of the vent hole 42 extends from the side surface to the upper surface along the curved shape of the cover member 32. These vent holes 42 can greatly accelerate the cooling of the engine 19 by introducing the outside air into the engine room 18 or by radiating the heat inside the engine room 18 to the outside air.

As in the above-described embodiment, by providing the cover member 32 having a shape matching the protruding shape portion 24 of the counterweight 20, the mass and shape of the counterweight 20 can be adjusted according to the function of the front working mechanism 12. It can be set appropriately. In particular, by disposing the cover member 32, it is not necessary to forcibly extend the length of the protruding shape portion 24, so that the finishing accuracy and strength of the protruding shape portion 24 can be kept high during casting, and the counterweight 20 The cost can be reduced by facilitating the manufacturing. Therefore, it is possible to easily realize a rear small turning type hydraulic excavator excellent in design.

The present invention is not limited to the above-described embodiment and can be implemented with various modifications and additions. In one embodiment, the cover member 32 is directly bolted and fixed to the counterweight 20.
As shown in FIG.
It can also be fixed by bolting to 48. In this case, the brackets 38 and 40 described above are fastened to the corresponding revolving structure supports 46 and 48, respectively.

Further, the shape, arrangement, number and the like of the vent holes 42 provided in the cover member 32 are not particularly limited, and they can be appropriately changed according to the vehicle body design, required cooling function and the like. . Although the case where the cover member is arranged only on the left side of the revolving structure is described in the embodiment, the cover member may be arranged on the right side, or may be arranged on both left and right sides.

In addition, the various members and structures mentioned in the embodiments are not limited to those shown in the drawings,
It goes without saying that it can be modified into any form.

[0023]

EFFECT OF THE INVENTION Revolving structure for construction machine of the present invention (Claim 1)
Can easily obtain a compact and functional shape of the counterweight, and can also realize at low cost a construction machine having an excellent design. Further, by exhibiting excellent performance in cooling the engine room (claim 2), it is possible to provide a revolving structure for a construction machine with high added value.

[Brief description of drawings]

FIG. 1 is a side view showing a hydraulic excavator as an example of a construction machine.

FIG. 2 is a plan view specifically showing the arrangement of counterweights.

FIG. 3 is a perspective view specifically showing a mounting portion of a door and a cover member.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV in FIG.

FIG. 6 is a plan view specifically showing a mounting portion of a cover member.

[Explanation of symbols]

2 running bodies 4 revolving structure 6 main frames 8 swivel device 10 cab 12 Front work mechanism 18 engine room 20 counter weight 22 doors 24 Projection shape part 32 cover member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Manabu Yamamoto             64 Nishihara, Miyashiro-cho, Minami-Saitama-gun, Saitama Prefecture (72) Inventor Nozomi Tanaka             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F-term (reference) 2D015 CA02 FA01 FA02

Claims (2)

[Claims] 1. A main frame mounted above a traveling body via a turning device and supporting a driver's cab and a working mechanism; and a main frame disposed behind the driver's cab and the working mechanism on the main frame to drive the vehicle. A revolving structure for a construction machine, comprising a body and an engine room accommodating an engine serving as a power source of the working mechanism, and a counterweight arranged at a rear portion of the main frame and partitioning a rear part of the engine room, A door that is provided on at least one side surface of the body, divides the side of the engine room between the driver's cab and the counterweight, and opens the engine room to the side, and the counter. A protruding shape portion integrally formed at an end portion of the weight and protruding from the end portion to above the door along one side surface of the revolving structure; Disposed above the door,
A revolving structure for a construction machine, comprising: a cover member that extends in the front-rear direction of the revolving structure in a continuous manner with the projecting shape portion and that partitions a side of the engine room together with the door. 2. The revolving structure for a construction machine according to claim 1, wherein the cover member has a vent for communicating the inside of the engine room with the outside air.