JPH0726438Y2 - Full swing work machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a full swing type working machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a hydraulic excavator as a full swing type working machine according to the prior art. In the figure, 1 is a lower traveling body, and 2 is an upper revolving body mounted on the lower traveling body 1 so as to be rotatable. The upper swing body 2 includes a frame 2A, and the frame 2A is provided with a machine room 3 covered with a cover 3A. As shown in FIG. 4, an engine 4, a hydraulic pump 5, a radiator 6 and the like are housed in the machine room 3, and the hydraulic pump 5 is located behind an oil storage tank 7 which will be described later. 4 is driven. In addition, FIG. 4 shows a state in which the cover 3A of the machine room 3 is removed.

7 is located on the right side of the front of the machine room 3 and is an oil storage tank provided on the frame 2A. 8 is located on the left side of the front of the machine room 3 and is provided on the frame 2A. A plurality of operating levers (not shown) for operating the directional control valve 11 are provided in the cab 8. By operating these, the pressure oil from the hydraulic pump 5 is transferred to the directional control valve 11. Through the lower traveling body 1 and the upper revolving body 2
(Not shown) and each cylinder (not shown). A counterweight 9 is provided on the rear end side of the machine room 3. The counterweight 9 is a curved portion 9A formed along a circle 12 having a turning radius R, which will be described later, and the curved portion 9A. And an arcuate portion 9B that is integrally provided on the inner side of, and is arranged within a circle 12. A working device 10 is provided on the front part of the upper swing body 2 so as to be rotatable up and down.

In the above-mentioned prior art, the hatched portion in FIG. 4, that is, the corner 8A of the cab 8 is a circle 12 having a turning radius R.
It projects further out. Therefore, when the upper swing body 2 is turned in a narrow work site, the corner portion 8A of the cab 8 may collide with surrounding structures, obstacles, etc., which may cause damage to the cab 8 or injury to the driver. There is a problem of causing an accident.

One of the means for solving the above problems is disclosed in Japanese Utility Model Laid-Open No. 63-100550. As shown in FIG. 5, in order to reduce the swing radius of the upper swing body, the cab 8 is retracted to the machine room 3 side, and the direction switching valve 11 is arranged between the oil storage tank 7 and the hydraulic pump 5. ing.

With this means, however, the projection of the cab 8 is eliminated and the minimum turning radius R becomes smaller, but the directional control valve 1
Since 1 is arranged between the hydraulic pump 5 and the oil storage tank 7, when the directional control valve 11 is maintained, the maintenance work is limited to the upper or lateral narrow width, which is a problem from the viewpoint of maintenance. .

[0007]

The present invention has been made in view of the above-mentioned problems of the prior art. Even when the upper swing body 2 is swung in a narrow work site, the cab does not hit surrounding structures or obstacles. It is an object of the present invention to provide a fully swinging working machine having excellent maintainability, which can prevent an accident such as cab damage or driver injury without collision.

[0008]

An undercarriage, a machine room 3 which is mounted on the undercarriage 1 so as to be swingable and accommodates an engine, and a cab 8 and an oil storage tank 7 are provided in front of the machine room. In the fully revolving working machine including the upper revolving structure 2 and the hydraulic pump 5 provided in the machine room 3 behind the oil reserving tank 7 of the upper revolving structure, the oil storage tank 7 is provided on the hydraulic pump 5 side. Then, the directional control valve 11 was positioned in front of the oil storage tank 7.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An explanation will be given with reference to FIGS. 1 and 2. It should be noted that in FIG. 1, the portions common to the known art will be described with the same reference numerals as those in FIGS. 3 and 4. As is apparent from FIG. 1, the oil storage tank 7 is further moved to the hydraulic pump 5 side as compared with that of FIG. 5, and the direction switching valve 11 is arranged on the front side (right side in the drawing) of the oil storage tank 7. . Further, as indicated by reference numeral 13 in FIG. 2, the upper portion of the cover 13 of the directional control valve 11 is cut off obliquely.

[0010]

[Effect] Since the oil storage tank 7 is retracted to the hydraulic pump 5 side and the directional switching valve 11 is arranged in front of the oil storage tank 7 in this way, the directional switching valve 11 is opened in the upper, front, left and right directions during maintenance. Therefore, the maintainability of the directional control valve 11 has been greatly improved. Further, by obliquely cutting the upper portion (reference numeral 14) of the cover 13 of the direction switching valve 11, it is possible to further widen the field of view of the operator in the lower right direction. On the other hand, if the field of view of the known one shown in FIG. 5 is to be widened, the upper part of the oil storage tank 7 is cut, and the capacity of the oil storage tank must be reduced, which is a problem. As described above, with the simple structure, the maintainability of the full swing type working machine is improved, and the fear that the front end of the cab goes out of the swing radius R is eliminated, and the effect is great.

[Brief description of drawings]

FIG. 1 is a partial plan view of an upper swing body of a full swing working machine according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of a known full swing working machine.

FIG. 4 is a plan view of an upper swing body portion of the same.

FIG. 5 is a plan view of an upper revolving superstructure part in which a directional control valve is shifted to the rear part.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 2A Frame 3 Machine Room 3A Cover 4 Engine 5 Hydraulic Pump 6 Radiator 7 Oil Storage Tank 8 Cab 9 Counterweight 9A Curved Section 9B Bow Section 10 Working Device 11 Directional Change Valve 12 ( Circle of turning radius R 13 Cover 14 Top of cover

Claims (2)

[Scope of utility model registration request] 1. An undercarriage, a machine room (3) pivotably mounted on the undercarriage (1) for accommodating an engine, and a cab (8) and an oil storage tank (7) in front of the machine room. And a hydraulic pump (5) provided in the machine room (3) behind the oil storage tank (7) of the upper swing body (2) In the working machine, retract the oil storage tank (7) to the hydraulic pump (5) side,
A full swing working machine characterized in that a directional control valve (11) is located in front of (7). 2. The full swing working machine according to claim 1, wherein a front portion of the cover (13) of the directional control valve (11) is cut off obliquely.