JPH0352833Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a full swing type work machine such as a hydraulic excavator, and in particular, the invention is a system that allows the upper revolving body to swing to perform work suitably even in narrow work sites. This invention relates to a full-swivel type work machine that is designed to rotate.

[Prior art]

FIG. 6 and FIG. 7 show a hydraulic excavator as an example of a fully rotating working machine according to the prior art.

In the figure, 1 denotes an undercarriage, 2 denotes an upper revolving body rotatably mounted on the undercarriage 1, and the upper revolving body 2 is a frame 2 forming a frame structure.
A, and the frame 2A is equipped with a machine room cover 3A.
A machine room 3 is provided which is covered by a. As shown in FIG. 7, inside the machine room 3,
An engine 4, a hydraulic pump 5, a radiator 6, etc. are accommodated, and the hydraulic pump 5 is connected to an oil storage tank 7, which will be described later.
It is located at the rear of the engine 4 and is rotationally driven by the engine 4. Note that FIG. 7 shows the machine room 3 with the machine room cover 3A removed.

7 indicates an oil storage tank located on the front right side of the machine room 3 and provided on the frame 2A; 8 indicates a driver's cab located on the front left side of the machine room 3 and provided on the frame 2A; A plurality of operating levers (not shown) are provided in the operator's cab 8 to switch the direction switching valve 17, which will be described later.By operating each of the operating levers, the direction of the pressure oil from the hydraulic pump 5 is switched. Via the valve 17, it is supplied to and discharged from the motor of the lower traveling body 1, the swing motor of the upper rotating body 2 (none of which are shown), and each cylinder 14, 15, 16, which will be described later. Further, 9 indicates a counterweight provided on the rear end side of the machine room 3, and the counterweight 9 includes a curved portion 9A curved along a circle 18 having a turning radius R, which will be described later, and a curved portion 9A. It consists of an arcuate part 9B that is integrally provided inside 9A,
It is adapted to be arranged within a circle 18.

Reference numeral 10 denotes a working device installed at the front of the upper revolving structure 2 so as to be able to rotate upward and downward. arm 12
and a bucket 13 pin-coupled to the tip side of the arm 12, and these are connected to the boom cylinder 1.
4. It is adapted to be rotated by an arm cylinder 15 and a bucket cylinder 16.

Furthermore, reference numeral 17 denotes a directional switching valve located in the driver's cab 8 and provided below the driver's seat, and the directional switching valve 17 is operated by the operating lever to allow the hydraulic pump 5 to pressurized oil to the traveling motor;
It is designed to be supplied to and discharged from the swing motor and each cylinder 14, 15, 16, etc. Although the directional switching valve 17 is actually composed of a plurality of directional switching valves, it is shown here as a single unit. Then, by switching the directional control valve 17, each cylinder 14, 15, 1
When pressure oil is supplied and discharged to 6, boom 11 and arm 1
2 and bucket 13 are rotated as appropriate.

In the hydraulic excavator configured as described above, while rotating the boom 11 and the arm 12 up and down,
The bucket 13 is rotated to perform earth and sand excavation work, etc. using the bucket 13. When working in a narrow work site, the boom 11 is rotated upward (raised) as shown in FIG. 6, and the arm 12 and bucket 13 are rotated to fold, as shown in FIG. The upper revolving body 2 is rotated along a circle 18 with a turning radius R, and a boom 11, an arm 12, and a bucket 13 are oriented in a desired direction to perform excavation work in a narrow site.

[Problem that the invention attempts to solve]

However, in the above-mentioned prior art, since the front left corner 8A of the operator's cab 8 shown by diagonal lines in FIG. When turning, the operator's cab 8
The corner portion 8A of the vehicle may collide with surrounding structures or obstacles, causing an accident such as damage to the driver's cab 8 or injury to the driver.

The present invention was developed in view of the above-mentioned shortcomings of the conventional technology, and even when the upper revolving structure is rotated in a narrow work site, the driver's cab can be prevented from colliding with surrounding structures or obstacles. To provide a fully rotating working machine which can eliminate accidents such as damage to the machine and injury to the driver.

[Means for solving problems]

The features of the means adopted by the present invention in order to solve the above-mentioned problems are as follows: In order to reduce the turning radius of the upper revolving structure, the operator's cab is retreated toward the machine room side;
The structure is such that a directional switching valve is disposed between the oil storage tank and the hydraulic pump.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. In this embodiment, the same components as those of the prior art shown in FIGS. 6 and 7 described above are given the same reference numerals, and their explanations will be omitted.

In the figure, 21 is located on the front left side of the machine room 3,
This shows a driver's cab provided on the frame 2A of the upper revolving body 2, and the driver's cab 21 is formed to have almost the same dimensions as the driver's cab 8 described in the prior art, and is designed to satisfy ISO standards, etc. ing. However, a concave portion 21A formed in a substantially rectangular parallelepiped shape is provided at the rear lower side of the driver's cab 21 and spaced apart from the left side surface of the driver's cab 21 by a predetermined distance. The driver's cab 21 is arranged on the frame 2A of the upper revolving structure 2 in a state where it is retreated toward the radiator 6 side of the machine room 3 via the recessed part 21A, and the recessed part 21A is arranged on the frame 2A of the upper revolving structure 2. etc. are accommodated inside it. Thus, as shown in FIG.
Each corner A, B, C, D has a turning radius R.
It is contained within the circle 18.

Reference numeral 22 is a support member located on the right front end side of the recessed part 21A and erected at a predetermined height on the frame 2A of the upper revolving body 2; The beds 23, 24, and 25 are respectively located on the left front, right front, and left rear sides of the driver's cab 21 to support the driver's cab 21. It is interposed between the driver's cab 21 and the frame 2A. and,
The bed 26 located on the right rear side of the driver's cab 21 is arranged between the upper surface of the concave portion 21A and the support member 22 so as to support the right rear portion of the driver's cab 21 at a position higher than the other beds 23 to 25 by a predetermined dimension. It is interposed between. In addition, in FIG. 4, in order to clearly show the support member 22, bed 24, etc., the oil storage tank 7, the direction change valve 27, etc., which will be described later, are omitted. Moreover, FIG. 2 shows a state in which the machine room cover 3A is attached.

Furthermore, 27 is switched by an operating lever in the driver's cab 21 to supply pressure oil from the hydraulic pump 5 to the traveling motor, the swing motor, and each cylinder 14, 1.
5, 16, etc., the directional switching valve 27 is replaced with the directional switching valve 17 (provided in the driver's cab 8) described in the prior art, and is installed in the oil storage tank. 7 and the hydraulic pump 5, and is provided in the machine room 3. The directional switching valve 27 is connected to an operating lever in the driver's cab 21 via a flexible wire or pilot piping (not shown), and is operated by the operating lever.

The hydraulic excavator according to this embodiment has the above-mentioned configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, a recessed part 21A is provided at the rear lower side of the driver's cab 21, and a part of the radiator 6 etc. is accommodated in the recessed part 21A, so that the driver's cab 21 is connected to the machine room 3. While retreating toward the radiator 6 side, the driver's cab 21 is moved to each bed 23, 24, 2.
5 and 26, and in particular, the upper surface side of the concave portion 21A is supported by the bed 26 on the right rear side.
2 at a predetermined height, the driver's cab 21 can be stably disposed on the frame 2A of the revolving upper structure 2, and each corner A of the driver's cab 21 can be can be kept within a circle 18 with a turning radius R as shown in FIG. This can definitely be prevented.

Further, since the directional switching valve 27 is disposed between the oil storage tank 7 and the hydraulic pump 5, as in the prior art,
There is no need to provide a directional control valve in the driver's cab 21, and the living space in the driver's cab 21 can be prevented from becoming narrower due to the recess 21A.
The size of 1A can also be made as small as possible. The driver's seat provided in the driver's cab 21 can be a commonly used chair or the like.
A special chair is no longer required, and costs can be reduced.

In addition, since the driver's cab 21 is required to provide sound insulation properties, sealing processing etc. are required, but since the concave portion 21A can be made as small as possible,
The operation cab 21 can be sealed relatively easily, and costs can be reduced. Since the directional control valve 27 is provided apart from the driver's cab 21, the noise from the directional control valve 27 can be reliably prevented from being transmitted into the driver's cab 21, and the noise level in the driver's cab 21 can be significantly reduced. can be lowered to

Furthermore, since the directional control valve 27 is arranged close to the oil storage tank 7 and the hydraulic pump 5, the piping etc. can be greatly shortened, and there is no need to take extra space for the piping. This improves the workability of piping work, etc.

Further, by simply providing the concave portion 21A in the driver's cab 21, the basic external dimensions can be made the same as those of conventional ones, so that ISO standards etc. can be satisfied, and the opening and closing door of the driver's cab 21 can be Various effects can be achieved, such as being able to use conventional products as they are for windows and windows.

Although the above embodiments have been described using a hydraulic excavator as an example, the present invention is not limited thereto, and can be applied to full swing type working machines other than hydraulic excavators.

[Effect of idea]

As detailed above, according to the present invention, in order to reduce the turning radius of the upper revolving structure, the driver's cab is moved back toward the machine room, and the directional control valve is disposed between the oil storage tank and the hydraulic pump. Therefore, there is no need to provide a directional control valve in the driver's cab, which prevents the driver's cab from becoming narrower and improves the workability of piping work and the like. The turning radius of the upper revolving body can be made as small as possible, and the driver's cab can be prevented from colliding with surrounding obstacles, etc. in narrow work sites. Therefore, various effects can be achieved, such as being able to eliminate accidents such as damage to the driver's cab and injury to the driver.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention,
Figure 1 is an overall view of the hydraulic excavator, Figure 2 is a plan view of the upper revolving body shown in Figure 1 with the machine room cover and working equipment removed, and Figure 3 is the arrow shown in Figure 2. - direction sectional view, FIG. 4 is a right side view of FIG. 3 with main parts cut away, FIG. 5 is a left side view of FIG. 3, FIGS. 6 and 7 show the prior art, and FIG. 6
This figure is an overall view of the hydraulic excavator, and FIG. 7 is a plan view of the upper revolving body shown in FIG. 6 with the machine room cover, working equipment, etc. removed. 1... Lower traveling body, 2... Upper revolving body, 2A...
... Frame, 3 ... Machine room, 3A ... Machine room cover, 7 ... Oil storage tank, 9 ... Counterweight, 10 ... Working equipment, 21 ... Driver's cab, 21A
... Recessed part, 22 ... Supporting member, 23, 24, 2
5, 26... Bed, 27... Directional switching valve, R...
...Turning radius.

Claims (1)

[Scope of utility model registration request] a lower traveling body; an upper rotating body that is rotatably mounted on the lower traveling body and is provided with a machine room for accommodating an engine; a driver's cab located on both sides of the front of the machine room; and an oil storage tank; In a full swing type work machine comprising a hydraulic pump located behind the oil storage tank of the upper revolving body and driven by an engine, in order to reduce the turning radius of the upper revolving body, A full swing type work machine, characterized in that the operator's cab is moved back toward the machine room, and a directional control valve is disposed between the oil storage tank and the hydraulic pump.