JP3073332B2 - Swiveling work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique related to the arrangement of an engine, a hydraulic pump, a control valve, an operator seat and the like in a swing type working vehicle such as a backhoe.

[0002]

2. Description of the Related Art FIG. 8 shows the arrangement of the upper surface of a turning frame 4 in a conventional turning type working vehicle.
As shown in the drawing, the engine B is conventionally arranged on the revolving frame 4 at the rear, and the control valve V is arranged at the front side of the swivel joint 3. Approximately 2 above the control valve V
Steps are formed with a gap of about 50 mm, and the operator seats 2 are arranged with reference to the steps.
There was a problem that the height of the tall was high. Further, it is necessary to cool the heat generated in the portion of the control valve V, and it is necessary for the engine cooling air D to pass through the portion of the control valve V, and it is necessary to form a passage for the engine cooling air D for this purpose. There was. For this reason, it is necessary to widen the space between the step and the turning frame 4.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a hydraulic pump and a control valve are integrated with each other and are disposed on the side of the engine, thereby eliminating the need for piping from the hydraulic pump P to the control valve. It suppresses the generation of pulsation. In addition, by arranging the control valve, which was conventionally arranged under the operator seat, on the side of the engine, the space can be used effectively, and an exhaust duct for noise reduction can be arranged, and a battery etc. It is used for the space where the is placed. Further, since the control valve moves to the side of the rear engine, the control valve exerts the effect of the counterweight, thereby improving the overall static balance of the revolving work vehicle.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. On the revolving work vehicle, on the revolving frame 4
Is placed behind the engine B, and on one side of the engine B
A hydraulic pump P is attached, and an input
The power shaft 25 is connected to the crankshaft of the engine B,
The control valve V is fixed to the hydraulic pump P and integrated.
And the control valve V
Hydraulic pipe group 9 that supplies pressurized oil from
It is arranged on one side of the revolving frame 4 and the other
The operator seat 2 is arranged on the side .

[0005]

Next, the operation will be described. The hydraulic pump P of the integrated hydraulic device A is driven by the engine B disposed inside the engine room 5. The boom cylinder 23, the arm cylinder 13, the bucket cylinder 16, and the swing cylinder 24 are expanded and contracted by the pressure oil discharged from the hydraulic pump P to perform work. The control valve V switches the pressure oil from the hydraulic pump P, and is conventionally disposed on the revolving frame 4 below the operator seat 2.
In the present invention, the control valve V is disposed integrally with the hydraulic pump P, and an extra space is formed below the operator seat 2.

[0006]

Next, an embodiment will be described. 1 is a side view of a backhoe of the revolving work vehicle, FIG. 2 is a plan view of an upper part of a revolving frame 4 of the revolving work vehicle of the present invention, and FIG. 3 shows the operator seat 2 in a position where the control valve V is removed. FIG. 4 is a plan view of the swing frame 4 of FIG. 3 above, FIG. 5 is a side view of a part where the hydraulic pump P and the control valve V are integrated, and FIG. 5 is a plan view, FIG. 7 is a front view of FIG. 5, and FIG. 8 is a view showing the positions of a conventional control valve V and a hydraulic pump P.

In FIG. 1, a crawler type traveling device 1.1
The turning table bearing device 11 is interposed on the, and the turning frame 4 is arranged so as to be able to turn 360 °. An operator seat 2, a safety frame 20, and a canopy 19 are erected on the revolving frame 4, and an engine B, a hydraulic pump P, and a control valve V are arranged inside an engine room 5 at the rear. The position of the control valve V shown in FIG. 1 indicates the position of the control valve V which has been conventionally arranged, and is conventionally arranged on the revolving frame 4 below the operator seat 2, It constituted a space and allowed air to flow through the space. Reference numeral 18 denotes a discharge plate.

The main boom 12 is provided at the front of the revolving frame 4.
The bucket arm 14 is pivotally supported at the upper end of the main boom 12, and the bucket 15 is pivotally supported at the tip of the bucket arm 14. The boom cylinder 23 rotates the main boom 12, the arm cylinder 13 rotates the bucket arm 14, and the bucket cylinder 16 rotates the bucket 15. In addition, the inside of the turning frame 4 is stored and the main boom 1 is
A swing cylinder 24 for swinging the left and right 2 is provided.

Referring to FIG. In the present invention, the control valve V, which has conventionally been mounted on the portion of the turning frame 4 below the operator seat 2, is an integrated hydraulic device A in which the hydraulic pump P and the control valve V are integrated. It is arranged on the side opposite to the operator seat 2. A radiator 8 and a cooling fan 7 are arranged on the engine B side of the operator seat 2.

The engine B, the integrated hydraulic system A, the radiator 8 and the cooling fan 7 are arranged inside the engine room 5 shown in FIG. The hydraulic pipe group 9 that supplies pressure oil and guides return oil to the boom cylinder 23, the swing cylinder 24, the bucket cylinder 16, and the swivel joint 3 is provided to the operator seat 2
It is located inside the opposite side. With this configuration, the position of the control valve V disposed below the operator seat 2 as shown in FIG. 8 becomes an extra space.

Next, the embodiment shown in FIGS. 3 and 4 will be described. 3, a cabin C that covers the periphery of the operator seat 2 is also provided. And the cabin C,
The operator seat 2 disposed inside is lowered to the surface of the revolving frame 4, and lowered from the position of the conventional cabin C2 to the position of the cabin C1. Operator seat 2
It is arranged lower than the conventional position in the same way as the above.
This configuration can be made because the position of the control valve V below the operator's seat 2 has a sufficient space. Also in the embodiment of FIG. 4, the hydraulic pipe group 9 is intensively arranged on the side opposite to the operator seat 2 in the same manner.

FIGS. 5, 6, and 7 disclose the structure of the integrated hydraulic device A. FIG. The input shaft 25 projecting from the hydraulic pump P is connected to the crankshaft of the engine B by a coupling. Then, the control valve V is fixed adjacent to the hydraulic pump P to form an integrated hydraulic device A.

[0013]

As described above, the present invention has the following advantages. First, in the revolving type work vehicle, an engine B is mounted on the rear side of the revolving frame 4, a hydraulic pump P is attached to one side of the engine B, and a control valve is provided to extend to the hydraulic pump P. Since the V is integrated, the piping from the hydraulic pump P to the control valve is not required, and the generation of the pulsation of the pressure oil can be suppressed. In addition, since the control valve moves to the side of the rear engine, the control valve exerts the effect of the counterweight, so that the overall static balance of the revolving work vehicle can be improved.

[0014] Second, in swing-type operation vehicles, control
Hydraulic valve that supplies pressure oil from the
Since the Ip group 9 is arranged on one side of the revolving frame 4,
This space can be effectively used, and an exhaust duct for noise reduction can be arranged, and a space for batteries and the like can be used.

Third, since the operator seat 2 is arranged on the other side of the turning frame 4 on which the hydraulic hose piping is arranged, the cabin C and the operator seat 2 in this portion are lower than in the conventional case, and Since the steps can be formed directly on the upper surface of the revolving frame 4, the operator seat 2 can be lowered and a safe and stable operating device can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a backhoe of a revolving work vehicle.

FIG. 2 is also a turning frame 4 of the turning type working vehicle of the present invention.
Plan view of the upper part of FIG.

FIG. 3 is a side view of the backhoe according to the embodiment in which the operator seat 2 is disposed at a position where the control valve V is removed.

FIG. 4 is a plan view of the revolving frame 4 of FIG. 3;

FIG. 5 is a side view of a part where the hydraulic pump P and the control valve V are integrated.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a front view of FIG. 5;

FIG. 8 is a view showing positions of a conventional control valve V and a hydraulic pump P;

[Explanation of symbols]

 A Integrated hydraulic system B Engine C Cabin P Hydraulic pump V Control valve 1 Crawler type traveling device 2 Operator seat 3 Swivel joint 4 Swivel frame 5 Engine room 7 Cooling fan 8 Radiator 9 Hydraulic pipe group

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 9/00 E02F 3/36

Claims (1)

(57) [Claims] 1. A turning type working vehicle, comprising: a turning frame;
The engine B is placed on the upper rear, and one side of the engine B
Is provided with a hydraulic pump P, which protrudes from the hydraulic pump P.
The input shaft 25 is connected to the crankshaft of the engine B
And the control valve V is fixed to the hydraulic pump P
The integrated hydraulic device A is integrated with the control valve.
Hydraulic pipe group 9 for supplying pressurized oil from bus V and guiding return oil 9
Is disposed on one side of the revolving frame 4, and the revolving frame 4
A turning type working vehicle, characterized in that an operator seat 2 is arranged on the other side of the turning work vehicle.