JPH0598665A - Swinging body main frame structure for construction machine - Google Patents

Abstract

PURPOSE:To facilitate the piping of a mounted engine by arranging a pair of flange sections to the outside, and widening the spaces in U-shaped members formed from a single plate as a tail frame to be fitted to a main swinging frame. CONSTITUTION:A tail frame 20 to be mounted with an engine and the like is fitted to a main swinging frame 10 installed with a working machine and a driver's seat to form a swinging body frame 100. The tail frame 20 is constituted of members 21, 22 folded into a U-shaped cross section from a single plate, and at least flanges 21b, 22b are stretched to the outside. The height H1 is made higher and spaces A, B are made wider than when an H-shaped steel is used, and an oil pan OP can be deeply inserted between the frame members 21, 22. Various pipes and harnesses can be easily arranged without changing the height of the engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving structure main frame structure which constitutes an upper revolving structure of a construction machine represented by a hydraulic excavator.

[0002]

2. Description of the Related Art A hydraulic excavator, for example, as shown in FIG. 4, has a lower traveling body 1 and an upper revolving body 2 provided on the upper portion thereof so as to be revolvable. Is rotatably attached. Further, FIG. 5 is a plan view of the revolving structure main frame MF forming the upper revolving structure 2.
Illustration of the front covers is omitted. A center joint 81, a swivel device 82, a control valve 83, are provided on the upper part of the main member 50 constituting the swivel main frame MF.
A machine room 84 for accommodating an engine, a hydraulic pump, and the like, and a counterweight 85 are placed substantially in series. 8
6 is a cabin.

FIG. 6 is a plan view showing the structure of the main member 50, FIG. 7 is a sectional view taken along the line VII-VII, and FIG. 8 is its line VIII-VI.
It is a II sectional view. The main member 50 includes a center frame 60 that rotatably supports the work machine 3 and a tail frame 70 that is connected to a rear portion of the center frame 60.
Is a pair of left and right frame members 71, 72 extending rearward.
have. The frame members 71 and 72 are composed of webs 71a and 72a, and upper and lower flanges 71b and 72b and lower flanges 71c and 72c provided above and below the webs 71a and 72a, respectively. The counterweight 85 is placed, and the engine oil pan OP in the machine room 84 is attached to the upper flange 71.
It is inserted between b and 72b. Here, conventionally, the webs 71a and 72a, the upper flanges 71b and 72b, and the lower flanges 71c and 72c are formed of different members, respectively, and are welded in an I-shape as shown in FIG.
1, 72 were constructed. That is, the frame member 7
1, 72 have a machine room 84 and a counterweight 85 on the upper part.
However, since it is difficult to obtain the required cross-sectional performance, it is not possible to use a commercially available I-type steel, and therefore, a welded structure of three members was used as described above.

[0004]

By the way, a space immediately outside each of the webs 71a, 72a constituting the frame members 71, 72 (a space between the upper flange and the lower flange, which is shown by A and B in FIG. 8). ), Various pipes such as a hydraulic pipe, an engine cooling water pipe, a pipe for circulating a cooling medium, and an electric harness are arranged. Therefore, in order to pass more pipes and harnesses without difficulty, the distance between the upper and lower flanges, that is, the web 71
It is desirable to make the height of a and 72a as high as possible.
However, in the conventional configuration, the webs 71a, 72a are
If the height of the engine is increased, the position of the engine in the machine room 84 mounted on the upper flanges 71a and 72a becomes higher. Therefore, in order to prevent this, the spaces A and B cannot be made large and many There is a problem that it is difficult to arrange the piping and harness.

It is an object of the present invention to provide a revolving main frame structure for a construction machine, which enables the height of the web to be increased without increasing the position of the engine.

[0006]

1 to 3 showing an embodiment, a center frame 10 for rotatably supporting a working machine and webs 21a, 2 will be described.
2a and upper and lower flanges 21b, 22b, 21c, 22c respectively provided on the upper and lower sides of the frame 2a and having a pair of left and right frame members 21, 22 extending in the vehicle front-rear direction,
A tail frame 20 connected to the center frame 10 is provided, and the engine is provided above the left and right upper flanges 21b and 22b, and the tip of the oil pan OP is provided to the upper flanges 21b and 21b.
It is applied to a main frame structure of a revolving structure of a construction machine which is placed in a state of being inserted between 22b. Then, the left and right frame members 21 and 22 configuring the tail frame 20 are each configured by bending a single plate into a substantially U-shape, and
Arrange these frame members 21 and 22 so that at least the respective upper flanges 21b and 22b project outward only,
This solves the above problem.

[0007]

Each of the frame members 21 and 22 constituting the tail frame 20 is formed by bending a single plate into a substantially U shape, and at least these upper flanges 21b and 22 are formed.
Since b is arranged so as to project only to the outside, FIG.
As shown in FIG.
The amount of insertion between 2b can be made larger than before, and therefore the webs 21a, 22a can be maintained without changing the height of the engine.
Can be made higher, and the spaces A and B can be made larger.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the main frame structure of the revolving structure of the hydraulic excavator shown in FIG. 4, and FIG. 2 is a sectional view taken along line II-II thereof.
FIG. 3 is a sectional view taken along the line III-III in FIG. The main member 100 that constitutes the revolving structure main frame MF includes a center frame 10 and a tail frame 20 connected to the rear end of the center frame 10. The center frame 10 includes a bottom plate 11, a pair of left and right webs 12 and 13 vertically mounted on the bottom plate 11, and a work machine mounting plate member 1 fixed between the left and right webs 12 and 13.
4, the base end of the working machine 3 and the base end of the working machine driving cylinder are rotatably attached to the brackets 15 provided on the plate member 14, respectively.

On the other hand, the tail frame 20 is composed of a pair of left and right frame members 21 and 22 connected to the inside of the rear end portions of the webs 12 and 13 and extending rearward, a lateral beam 23 arranged between them, and a bottom plate. 24 and. The frame members 21 and 22 have webs 21a and 22a, respectively.
And upper and lower flanges 21b and 22b and a lower flange 21c, which are provided on the upper and lower parts thereof so as to project outward, respectively.
22c. Further, the frame members 21 and 22
Is formed by bending a single plate into a U-shape as shown in FIG. 3, and the upper and lower flanges 21b, 21c and 22 are
b and 22c are arranged so as to project only to the outside. The height H1 of the webs 21a and 22a is the same as the conventional height H2.
Made higher.

On the upper part of each upper flange 21b, 22b,
The machine room 84 shown in FIG. 5 is placed in the substantially central portion, and the counterweight 85 is placed in the rear portion. Then, as shown in FIG. 3, the oil pan OP of the engine provided in the machine room 84 is connected to the upper flanges 21b and 22b.
It is inserted in between.

Here, conventionally, since the web and the flange are formed of separate members and the frame member is formed by welding them, it is necessary to have an I-shaped structure as shown in FIG. 8 in terms of strength. It was In this embodiment, since the frame members 21 and 22 are each formed of a single plate and the height of the webs 21a and 22a is increased as described above, there is no problem in terms of strength even with the U-shaped structure. Further, by adopting the U-shaped structure, the flange does not project inwardly as in the conventional case, and therefore, as shown in FIG. 3, the insertion amount between the upper flanges 21b and 22b of the oil pan OP is increased. Therefore, even if the heights of the webs 21a and 22a are increased, the height of the engine is the same as that of the conventional engine. That is, the spaces A and B can be made larger than before without changing the height of the engine, and more pipes and the like can be arranged.

Further, by constructing the left and right symmetrical frame members 21, 22 by a single plate, welding work becomes unnecessary, and the right and left frame members 21, 22 can be changed by changing the bending direction with the same press machine. Since 22 can be processed, it is possible to significantly reduce the number of steps and reduce the cost.

Although the hydraulic excavator has been described above, the present invention can be applied to other construction machines having a lower traveling structure and an upper revolving structure.

[0015]

According to the present invention, a pair of left and right frame members constituting a tail frame are formed by bending a single plate into a substantially U-shape, and at least the upper flanges of these members are attached only to the outside. Since it is arranged so that it can be taken out, the amount of insertion between the upper flanges of the engine oil pan can be made larger than in the past, and thereby the height of the web can be increased without changing the height of the engine. Therefore, a large space can be secured on the outer side of the web, and a large number of pipes and harnesses can be arranged therein without difficulty.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a main frame structure of a revolving structure for a construction machine according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view of the hydraulic excavator.

FIG. 5 is a plan view of an upper swing body of the hydraulic excavator.

FIG. 6 is a plan view showing a conventional revolving structure main frame structure.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

[Explanation of symbols]

 10 Center frame 11 Bottom plate 12,13 Web 20 Tail frame 21,22 Frame member 21a, 22a Web 21b, 22b Upper flange 21c, 22c Lower flange 100 Main member MF Revolving main frame OP Oil pan

Claims (1)

[Claims] 1. A center frame that rotatably supports a work machine, and a pair of left and right frame members that extend in the vehicle front-rear direction and that include a web and upper and lower flanges provided above and below the web, respectively. A tail frame to be connected, wherein the engine is mounted on the upper left and right upper flanges with the oil pan tip inserted between the upper flanges. The left and right frame members that make up the frame are
A main frame structure for a revolving structure of a construction machine, wherein each of the frame members is formed by bending a single plate into a substantially U shape, and at least the respective upper flanges are arranged so as to project outward only.