JP2001262615A - Hydraulic backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use the length of pipings and piping works in common regardless of the changes of frame height dimensions corresponding to the kinds of machines. SOLUTION: In constitution in which a control valve unit 13 is installed onto the top face of the bottom plate 10 of an upper frame 7, a distance A against a valve is kept constant by properly using two kinds of brackets 17, 18 for installing the valve having different height dimensions B in response to the changes of frame height dimensions H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small hydraulic excavator having an improved valve mounting structure.

[0002]

2. Description of the Related Art Conventionally, in a small excavator called a mini excavator, as shown in FIG. 4, an upper revolving structure 2 is mounted on a crawler type lower traveling structure 1 so as to be pivotable about a vertical axis. A work attachment 6 having a boom 3, an arm 4, and a bucket 5 is attached to a front portion of the upper swing body 2.

[0003] The upper revolving superstructure 2 is configured by mounting an engine and its related devices in addition to a driver's seat 8 and various operating devices 9 on an upper frame 7.

As shown in FIG. 5, an upper frame 7 has a bottom plate 10, a floor plate 11 arranged on the bottom plate 10 at an interval, and a deck cover covering four circumferences (separately referred to as side, front and rear covers). There is also) 1
Consists of two.

A valve housing space S is formed in the upper frame 7, and a control valve unit 13 having a plurality of control valves is housed in the valve housing space S.

The control valve unit 13 is supplied with remote control pressure from remote control valves 14 of a plurality of operating devices 9 installed on the upper frame 7 and operated by levers.

For this reason, each remote control valve 14 and a control valve unit (hereinafter simply referred to as a valve unit).
13 is connected by a hydraulic piping group 15. Further, an electric cable (not shown) for transmitting an electric signal from above the upper frame 7 may be connected to the valve unit 13.

In such a background, the valve unit 13 is conventionally mounted on the upper frame bottom plate 10 via the bracket 16 (or directly).

[0009]

However, the height dimension of the upper frame 7 (hereinafter referred to as frame height dimension).
H changes depending on the model. Specifically, for example, since the height of the swing motor mounted on the upper surface of the upper frame 7 differs depending on the model, the position of the floor plate 11 needs to be changed, and the frame height H changes accordingly. Further, the frame height H may change depending on the size of a cylinder such as a swing cylinder for swinging the work attachment 6.

Then, the distance from the floor plate 11 to the valve unit 13 (the distance from the upper surface of the floor plate to the lower surface of the valve unit is shown in the figure; hereinafter, referred to as the distance to the valve) by the change of the frame height dimension H. Changes.

In this case, conventionally, the length of the piping (including the electric cable, if any) is changed in accordance with the change in the valve distance A according to the above model. There has been a problem that the efficiency of the work (in the case of including a cable, in addition to the wiring work) is poor, the number of types of parts increases, and the cost increases.

Accordingly, the present invention provides a hydraulic excavator that can share the length of piping and piping work irrespective of a change in frame height depending on the model.

[0013]

According to a first aspect of the present invention, an upper frame of an upper swing body mounted on a lower traveling body has a bottom plate and a floor plate provided on the bottom plate. In a hydraulic shovel in which a valve is provided in a valve receiving space formed between the floor plate and the floor plate, the valve is positioned such that the distance from the floor plate is constant regardless of a change in the height of the upper frame. It is provided with valve mounting means for mounting.

According to a second aspect of the present invention, in the first aspect, the valve mounting means is a bracket mounted on the upper surface of the bottom plate and on which the valve is mounted. It is configured such that a plurality of types of brackets having different height dimensions can be used properly.

According to a third aspect of the present invention, in the configuration of the first aspect, a bracket attached to the lower surface of the floor plate and used to suspend the valve is used as the valve attaching means.

According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, a plurality of control valves are collectively provided as a control valve unit in a valve housing space by common valve mounting means. .

According to the above configuration, the valve can be mounted in the valve receiving space by the valve mounting means so that the distance to the valve is constant regardless of the change in the frame height of the upper frame.

In this case, according to the second aspect, when a mounting bracket on which the valve is mounted is used as the valve mounting means, a plurality of types of brackets having different heights are selectively used. Each of the objects can be achieved by adopting a structure in which a suspension type bracket on which the valve is suspended is attached to the lower surface of the floor plate as a valve attachment means.

Accordingly, there is no need to change the length of the piping for each model (frame height dimension) and to change the piping work, and these can be shared for each model. For this reason, the efficiency of piping work can be improved, the number of types of parts can be reduced, and the cost can be reduced.

In particular, according to the structure of the third aspect, the cost can be further reduced because only one kind of bracket is required.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In the following embodiments, the same parts as those of the prior art shown in FIG.

First Embodiment (See FIGS. 1 and 2) In the first embodiment, a plurality of types of mounting type valve mounting brackets (valve mounting means) having different height dimensions are prepared in advance, and the frame height varies depending on the model. A configuration is adopted in which the distance A to the valve is made constant by selectively using these in accordance with the dimension H.

In the illustrated example, a large bracket 17 having a relatively large height dimension B and a small bracket 1 having a relatively small height dimension B are provided.
8 are shown.

The height B of the two brackets 17, 18
It is assumed that B = H−A, as shown by the solid line in FIG. 1, when the frame height dimension H is large, the large bracket 17 also shown in FIG. 2A, and when the frame height dimension H is small, FIG. The valve unit 13 is mounted using the small brackets 18 also shown in b).

Thus, the distance A to the valve can be kept constant irrespective of the change in the frame height dimension H. Therefore, the length of the piping 15 installed between the valve unit 13 and the remote control valve (not shown here) can be shared regardless of the model.

Second Embodiment (See FIG. 3) Only differences from the first embodiment will be described.

In the second embodiment, the valve mounting bracket 19 is mounted on the lower surface of the floor plate 11, and the valve unit 13 is mounted on the lower surface of the bracket 19 in a suspended manner.

In this way, the valve unit 13 can be mounted on the same bracket 19 regardless of the change in the frame height dimension H.
Can always be mounted with the same distance A to the valve.

Further, as compared with the case where a plurality of types of brackets 17 and 18 having different heights B are properly used as in the first embodiment, only one type of bracket 19 is required.

In the above embodiment, the mounting portion of the control valve unit 13, which is a preferred example of the present invention, has been described as an application object. The same applies to the mounting portion of the valves and the like.

[0032]

As described above, according to the present invention, the valve can be mounted in the valve receiving space by the valve mounting means so that the distance to the valve is constant regardless of the change in the frame height of the upper frame. .

Therefore, it is not necessary to change the length of the piping for each model (frame height dimension) and to change the piping work, and these can be used in common for each model. The cost can be reduced by reducing the number of types.

In particular, according to the third aspect of the present invention, the bracket can be of a common type, so that the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view of an upper frame showing a first embodiment of the present invention.

FIGS. 2A and 2B are partial perspective views showing two examples of a bracket used in the embodiment. FIGS.

FIG. 3 is a partial sectional view of an upper frame according to a second embodiment of the present invention.

FIG. 4 is a schematic side view showing a general configuration of a small hydraulic excavator.

FIG. 5 is a partial cross-sectional view of the upper swing body including the upper frame of the shovel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 7 Upper frame 10 Bottom plate of upper frame 11 Same floor plate 12 Same deck cover S Valve accommodation space 13 Control valve unit 17, 18 Two types of mounting brackets with different height dimensions (valve mounting means) 19) Hanging bracket (Valve mounting means) A Distance between floor plate and valve

Claims (4)

[Claims] 1. An upper frame of an upper revolving structure mounted on a lower traveling structure has a bottom plate and a floor plate provided on the bottom plate, and a valve formed between the bottom plate and the floor plate. In a hydraulic shovel in which a valve is provided in a housing space, a valve mounting means for mounting the valve at a constant distance from the floor plate regardless of a change in a height dimension of the upper frame is provided. And a hydraulic excavator. 2. A bracket for mounting a valve mounted on an upper surface of a bottom plate as a valve mounting means, wherein a plurality of types of brackets having different heights are selectively used according to the height of an upper frame. The excavator according to claim 1, wherein the excavator is configured as follows. 3. The hydraulic shovel according to claim 1, wherein a bracket mounted on the lower surface of the floor plate and on which the valve is suspended is used as the valve mounting means. 4. The hydraulic shovel according to claim 1, wherein a plurality of control valves are collectively provided as a control valve unit in a valve housing space by a common valve mounting means.