JPH11256614A - Structure of upper frame of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution, in which simple junction, which is left as it is under a horizontal state and is not related to the quantities of a bottom- plate end section deformed to the center sections of each side deck of the upper frame of a working machine, and a reinforcing member adding sufficient supporting strength to each side deck are added. SOLUTION: A pair of upright plates 61 are disposed upright on a bottom plate 60 in the center section 51 of the upper frame of the working machine, and side decks 52 are joined at the specified places of the upright plates 61 separated from the lower end section of the bottom plate. Reinforcing members 54 are installed among the bottom-plate end sections and the undersides of the side decks, load applied to the side decks 52 through the reinforcing members is also transmitted to the bottom plate 60, and structure, in which both the upright plates 61 and the bottom plate 60 support load, is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an upper frame which serves as a base of an upper revolving structure of a working machine for performing excavation work, leveling work and the like.

[0002]

2. Description of the Related Art As a working machine to which the prior art is applied,
A description will be given based on FIG. 3 taking a hydraulic excavator as an example.

[0003] In the drawing, reference numeral 30 denotes a lower traveling body, 40 denotes an upper revolving body rotatably mounted on the lower traveling body, and the upper revolving body 40 is mounted on an upper frame and the upper frame. Operator cab 42, machine room 43
And a counter weight 53.

[0004] In addition to the above configuration, a working device 41 is installed on the front side of an upper frame, which will be described later, between each bracket portion in the center section so as to be able to move up and down.

Next, the detailed structure of the upper frame will be described with reference to FIG.

Reference numeral 51 denotes a center section provided substantially at the center of the upper frame. The center section 51 is formed as shown in the figure, and has a bottom plate 60 provided with an installation hole for providing a turning actuator in the center.
And a pair of standing plates 61, 61 erected on the bottom plate 60 so as to be separated from each other.

[0007] Each of the standing plates 61, 61 is placed on the bottom plate 60,
The right and left standing plates 61, 6 are substantially perpendicular to the bottom plate 60.
1 are positioned so as to be parallel to each other, and each standing plate 61,
Numeral 61 is erected at the erected positions 63 of the bottom plate by welding. The front upper ends of the standing plates 61, 61 become a pair of bracket portions 64, 64, and the center section 51 is connected to the bracket portions 6 of the standing plates 61, 61.
By connecting the working device 41 to the pins 4 and 64 with pins, the working device 41 is supported so as to be able to move up and down.

Reference numerals 52, 52 denote respective side decks located on both left and right sides of the center section 51. The side decks 52, 52 are joined on a bottom plate of the center section 51, and are combined with the center section 51 to form an upper frame. Is roughly constituted.

Reference numeral 65 denotes a counterweight support provided on the rear end side of the center section 51 so as to be spaced apart left and right. Each of the counterweight supports 65 extends toward the rear of each of the uprights 61. Each of the counterweight support portions 65 is provided with a support member 68 having a space through which a counterweight mounting bolt can pass. With the above configuration, the counterweight 53 can be mounted on the counterweight support 65.

The conventional hydraulic excavator has the above-described configuration. The function of the hydraulic excavator performing various operations described below will be described with reference to FIG. Traveling function: When the operator in the cab 42 operates the traveling operation lever, the hydraulic pump in the machine room 43 supplies hydraulic oil to the traveling hydraulic motor mounted on the lower traveling body 30 to drive the vehicle downward. Not only the body 30 but also the upper revolving structure 40 can be moved to a position desired by the operator. Excavation function: When the operator in the operator's cab 42 operates the operation lever for operation, the hydraulic pump in the machine room 43 supplies pressure oil to each hydraulic cylinder installed in the operation device 41, and the operation device 41 By operating the excavator, the excavator performs the excavation work as the operator thinks. Turning function: When the excavator having the excavation function performs excavation work at the work site, and then discharges excavated earth and sand contained in the bucket to a place different from the work site, the entire excavator is driven by traveling. When the operator in the driver's cab 42 operates the turning operation lever, the lower traveling body 30
The upper revolving superstructure 40 can dump excavated earth and sand by changing the working direction to a place different from the desired work site, and can be covered with a minimum required operation, thereby improving workability.

From the above functions, the excavator has the ability to perform excavation work efficiently.

However, as shown in FIG. 7, in the center section of the upper frame, the standing plate 61 is erected on the bottom plate 60 by welding, and high heat generated during welding is transmitted to the bottom plate 60. The standing position 63 on the bottom plate 60 is distorted, and the bottom plate end 6
9 may be deformed so as to be slightly lifted above the horizontal position. In order to assemble and manufacture a hydraulic excavator, it is a necessary condition that joining of the side decks is performed in a horizontal state. The reason for this is that the hydraulics to be mounted on each of the side decks in a horizontal state, Only when the guard outer surfaces provided to surround the devices and the like are mounted on the respective side decks which are in a horizontal state as shown in the design drawing, the entire guard outer surface in appearance is within a curved surface. And the appearance of the entire hydraulic excavator after assembly is completed as shown in FIG. If each side deck is joined to the deformed portion 71 of the bottom plate 60 in the center section in the state shown in FIG. 7, each of the side decks is also inclined, and the lower end portions of the guards mounted on each of the side decks Abuts against the side decks that are raised above the horizontal position, and the guards are closed in a half-open state, resulting in a stepped portion in the appearance of the excavator. Is very unsightly.

[0013] The contents shown in the preceding paragraph were set as problems to be solved.
Japanese Patent Application Laid-Open No. Hei 7-150589 discloses an invention aimed at preventing the lowering of the right and left ends of the bottom plate in the center section of the upper frame of a working machine such as a hydraulic shovel, thereby preventing a reduction in assembly workability. However, the main configuration will be described with reference to FIG. 5. The configuration having a unique effect is attached to each predetermined position on the bottom plate 60, and then the standing plate 61 is moved to the standing position 63 of the bottom plate 60. There is a deformation preventing member 70 in an order of being erected, and the deformation preventing member 70 is lifted slightly above the horizontal position due to high heat of welding when the bottom plate end portion 69 stands the standing plate. It has the effect of preventing deformation, and thus has the effect of significantly improving the workability of assembling the working machine.

[0014]

FIG. 6 shows a schematic structure of an upper frame using the prior art. Due to the fact that the standing plate 61 in the center section 51 is erected at the standing position 63 of the bottom plate 60 by welding, high heat during welding is transmitted to the bottom plate 60, so that the standing position 63 is distorted by the high heat. And the deformed portion 71 as shown in FIG.
May occur, and the bottom plate end portion 69 may be deformed so as to slightly lift above the horizontal position.

Since it is difficult to join the side decks 52, 52 horizontally to the left and right of the center section 51 in the state shown in FIG. 7, an upright plate 61 is conventionally provided on the bottom plate 60. Thereafter, the deformed portion 71 is hit with a hammer or the like to be in a horizontal state to be in the state shown in FIG. 6, or an adjustment operation for cutting the side decks 52, 52 in accordance with the deformation of the bottom plate end 69 is performed. Was. However, there is a problem in that any adjustment work is troublesome and reduces the workability of assembly.

With regard to the structure of the upper frame according to Japanese Patent Application Laid-Open No. 7-150589, when the deformation preventing member 70 having a unique effect is mounted on the bottom plate 60 in the center section 51, each of the upright plates 61,
The bottom plate 60 has not yet been erected and has a flat plate shape.
Care must be taken to determine the exact mounting position of the deformation preventing member 70, which is dwarfed compared to the above, on the bottom plate 60,
If an error occurs in the mounting position, the standing plates 61, 61, which are subsequently erected at the standing position 63 of the bottom plate 60, are not sufficiently joined to the respective deformation preventing members 70, and the respective deformation preventing members 70 are not joined. Since there is a possibility that the effect of 70 may not be obtained, it is troublesome to determine an accurate mounting position as described above, and there is a possibility that the assembling workability may be reduced.

In view of the above, the present invention provides a simple joining of the side decks 52 of the upper frame of the working machine to the center section 51 of the side decks 52, 52, regardless of the amount of deformation of the end of the bottom plate. It is an object of the present invention to provide a configuration in which a reinforcing member for adding sufficient supporting strength to each side deck 52 is added to the left.

[0018]

In order to solve the above-mentioned problems,
The present invention is characterized in that, after each standing plate is erected on the bottom plate in the center section of the upper frame of the working machine, a predetermined position of each standing plate is separated by a predetermined distance from a lower end portion joined to the bottom plate of each standing plate. And the side decks are joined together.

The upper frame having the above structure is
Even if the end of the bottom plate in the center section is slightly raised from the horizontal position, each side deck is joined to a predetermined position of each upright that does not abut against the end of the bottom plate, so that each side deck maintains a horizontal state. Without being hindered, joining to each standing plate can be easily performed.

Further, in the structure of the upper frame according to the present invention, in order to increase the joining strength of each side deck to the center section, a reinforcing member for connecting the bottom plate end in the center section to the lower surface of the side deck is provided. Provided.

By providing the reinforcing members at the positions described above, the load received by the side deck from the driver's cab, hydraulic equipment, and the like mounted on the side deck is not limited to the standing plate directly joined to the side deck, It is also transmitted to the end of the bottom plate to be connected via the reinforcing member, and the bottom plate can also indirectly support the load, and the bonding strength to the center section of the side deck is increased. Breakage and separation of the side deck from the center section is prevented.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. It is to be noted that the same components as those of the conventional technology are denoted by the same reference numerals.

In the figure, after a pair of standing plates 61, 61 are joined to the standing positions 63, 63 of the bottom plate 60 in the center section 51 according to the first aspect of the present invention by welding, each standing plate 6 is joined.
Each of the side decks 5 is located at a predetermined position 72, 72 of the upright plate away from the end portions 62, 62 which are joined to the bottom plate 60,
2 and 52 are joined. It is desirable that the distance from the end portion 62 to a predetermined position is at least 3 to 5 mm.

Further, the configuration of the upper frame according to the second aspect of the present invention is not limited to the upright plate 61, but is also provided between the left and right bottom plate ends 69, 69 and the lower surfaces 73, 73 of the left and right side decks. When the reinforcing members 54, 54 in the form of connection are provided, the side deck 5 is connected via the reinforcing members 54.
2 is transmitted from the lower surface 73 of the side deck 52 to the bottom plate end 69 and eventually to the bottom plate 60, and the load applied to the side deck 52 is supported by both the standing plate 61 and the bottom plate 60. Therefore, it is possible to increase the bonding strength.

In joining the reinforcing member 54, there is no strict joining position between the lower surface 73 of the side deck 52 and the bottom plate end 69 so as to cause a reduction in workability. Even if the bottom plate end is slightly lifted from the horizontal position due to the welding connection of 61, regardless of the degree of lifting of the bottom plate end 69, the reinforcing member 54 is first placed on the lower surface 73 of the side deck 52. Then, the contact position between the reinforcing member 54 and the bottom plate end portion 69 is joined by welding.
4 is the bottom plate end 69 and the lower surface 7 of the side deck 52.
3 can be performed only by pressing the reinforcing members 54 at the same time, so that there is no trouble in joining the reinforcing members 54, and the joining of the reinforcing members 54 does not cause a reduction in the workability of assembling the working machine.

[0026]

As described above, when assembling a working machine having the structure of the upper frame according to the present invention, even if the end of the bottom plate in the center section of the upper frame is slightly lifted upward, It is possible to join the side decks to the center section in a horizontal state regardless of whether the guards can be arranged according to the design drawing regardless of the amount of deformation of the bottom plate end, and the work efficiency of the working machine is improved. improves. In addition, the aesthetic appearance of the entire working machine having the guards can be reliably obtained.

In addition to the above structure, the structure of the upper frame according to the present invention is such that the load applied to the side deck is also applied to the bottom plate in the center section via the reinforcing member connecting the lower surface of the side deck and the bottom plate end. Since the load can be supported together with the standing plate, the joining strength of each side deck to the center section is reliably increased, and there is no shortage in strength.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing the structure of an upper frame according to the present invention.

2 is a bottom plate end portion 69 of the upper frame shown in FIG. 1;
FIG. 68 is a schematic front view showing a state in which 68 is lifted upward.

FIG. 3 is an overall perspective view showing a hydraulic excavator according to the related art.

FIG. 4 is an overall perspective view showing an upper frame according to the related art.

FIG. 5 is a partially enlarged view of a center section 51 showing an attached state of each deformation preventing member 70 according to Japanese Patent Application Laid-Open No. 7-150589.

FIG. 6 is a schematic front view showing the structure of the upper frame shown in FIG. 4;

7 is a bottom plate end portion 69 in the center section 51. FIG.
FIG. 4 is a schematic view showing a state where the has been deformed so as to lift upward.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 Lower traveling body 40 Upper revolving structure 41 Working device 42 Operator's cab 43 Machine room 51 Center section 52 Side deck 53 Counterweight 54 Reinforcement member 60 Bottom plate 61 Standing plate 62 Lower end 63 Standing position 64 Bracket 65 Supporting member 68 Supporting member 69 bottom plate end 70 deformation prevention member 71 deformed part 72 predetermined position of standing plate 61 73 lower surface

Claims (2)

[Claims] 1. An undercarriage and a revolvable upper revolving body above the undercarriage, the upper revolving body being a cab, hydraulic equipment, working equipment, guards (including counterweights), etc. In the working machine having the above configuration, which has an upper frame on which the components are mounted, the upper frame has a center section including a bottom plate and a pair of standing plates erected on the bottom plate; and Each of the side decks is joined to a predetermined portion of the upright plate, and is separated from the predetermined portion by a predetermined distance from an end portion of the upright plate joined to the bottom plate. The structure of the upper frame of the working machine, wherein the upper frame is a part of the standing plate. 2. The upper frame of a working machine according to claim 1, wherein the upper frame has a reinforcing member between the left and right bottom plate ends in the center section and the lower surface of each side deck. Structure.