JP2001271378A - Swiveling working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a swiveling base 7 compact by arranging a valve unit 25 on the same plane position as a hydraulic oil tank 24 so that the valve unit 25 may not be affected by heat from the hydraulic oil tank 24. SOLUTION: In a swiveling working machine in which a swiveling base 7 is provided rotatably around a vertical axis on a traveling unit 1, an engine 21 to which a hydraulic pump 23 is connected is arranged sideways in the rear of the swiveling base 7, a hydraulic oil tank 24 to supply hydraulic oil to the hydraulic pump 23, and a valve unit 25 in which many control valves to distribute hydraulic oil from the hydraulic pump 23 to a variety of hydraulic working machines are connected in parallel are mounted on the swiveling base 7, the valve unit 25 is stored sideways in a storing space 32 provided below the hydraulic oil tank 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning work machine such as a backhoe.

[0002]

2. Description of the Related Art In a turning machine of this type, a turning table is generally provided on a traveling device so as to be rotatable around a vertical axis, and a hydraulic pump is connected to the turning table at one end in the left-right direction. Engine, a hydraulic oil tank that supplies hydraulic oil to the hydraulic pump, and a valve unit that connects in parallel a number of control valves that distributes hydraulic oil from the hydraulic pump to various hydraulic work equipment. ing. On the other hand, in the case of a small-turn turning machine in which the rear surface of the swivel does not protrude from the vehicle width of the traveling device, it is necessary to fit the rear surface of the swivel into a circle having the vehicle width as a diameter. It is very difficult to arrange engines and radiators and hydraulic pumps to be arranged in series with them, so relatively large equipment other than engines such as fuel tanks and hydraulic oil tanks and valve units are limited. It must be located as efficiently as possible within the plane of the swivel table.

[0003] In addition, when the main equipment necessary for hydraulic drive of a hydraulic pump, a hydraulic oil tank, a valve unit, and the like (hereinafter referred to as hydraulic equipment) is distributed and arranged to separate parts on a swivel, the hydraulic equipment is provided. When performing intensive maintenance inspections, various parts of the bonnet must be opened and closed,
The maintenance work becomes complicated. Therefore, as a conventional turning machine for small turning, a hydraulic oil tank is vertically arranged in front of a hydraulic pump directly connected to the engine, and a valve unit is mounted vertically on the front side of this hydraulic oil tank. (See JP-A-11-81377). In this case, since the vertical valve unit is attached to the front side of the hydraulic oil tank, the turntable does not increase in size, and the hydraulic equipment can be concentratedly arranged on one end in the left and right direction of the turntable. There is an advantage that intensive maintenance work is facilitated.

[0004]

However, when a vertical valve unit is mounted on the front side of a hydraulic oil tank as in the above-mentioned conventional turning work machine, a control valve comprising a solenoid valve or the like constituting the valve unit is provided. However, there is a drawback that a failure may occur at an early stage due to heat generated from a hydraulic oil tank which is relatively easily heated. On the other hand, in order to solve such inconvenience, the valve unit may be installed in a portion far away from the hydraulic oil tank in the swivel. However, as described above, the swivel Since the valve unit and hydraulic oil tank, both of which are relatively large equipment, must be placed separately at different locations in the swivel base, the efficiency of each equipment in the swivel base can be reduced. It is not preferable from the viewpoint of a simple layout.

In view of the above circumstances, the present invention arranges the valve unit in the same plane position as the hydraulic oil tank so as to minimize the influence of heat generated from the hydraulic oil tank, thereby improving the durability of the valve unit. An object of the present invention is to make a swivel table compact without lowering it.

[0006]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, according to the present invention, a swivel is provided on a traveling device so as to be rotatable around a vertical axis, and an engine to which a hydraulic pump is connected is disposed laterally at a rear portion of the swivel, and the hydraulic pump is Swivel work in which a turning oil tank that supplies hydraulic oil and a valve unit that connects a number of control valves in parallel that distributes the working oil from the hydraulic pump to various hydraulic working devices are mounted on the swivel base. The valve unit is stored laterally in a storage space provided below the hydraulic oil tank.

In this case, since the valve unit is housed in the housing space provided below the hydraulic oil tank, the valve unit can be arranged in the same plane position as the hydraulic oil tank, so that the swivel base can be made compact and the operating unit can be operated. Since the valve unit is disposed below the oil tank, heat generated from the hydraulic oil tank is less transmitted to the valve unit side, and the temperature rise of the unit can be prevented as much as possible. In the present invention, in order to make the planar shape of the swivel base more compact, it is preferable to dispose the valve unit in a storage space provided below the hydraulic oil tank so as not to protrude from each side of the hydraulic oil tank. .

Further, in the present invention, since the valve unit is disposed laterally, the traveling system lever for operating the traveling device is interlocked to the control valve constituting a part of the valve unit via the link mechanism. Can be done.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a small turning backhoe 1 exemplified as a turning work machine. In FIG. 3, the backhoe 1 is mainly composed of a traveling device 2, a revolving unit 3, and an excavating device 4. Hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 3) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper-penetrating direction in FIG. 3) is referred to as the left-right direction.

As shown in FIG. 3, the traveling device 2 includes a pair of left and right crawler traveling members 5 having rubber crawler tracks, and the crawler traveling device in which these traveling members 5 are driven by a traveling motor M is used. Has been adopted. A dozer 6 is provided at a front portion of the traveling device 2. The revolving unit 3 is supported by a bearing 8 provided at a central portion between the left and right crawler traveling units 5 of the traveling device 2 so as to be rotatable around a vertical axis of rotation. A bonnet 20 for covering various mounted devices, and a seat 4 provided on the bonnet 20
1 and a canopy 42 for covering the control section in front of the canopy.

The revolving base 7 is constructed by covering a frame formed by combining a frame member having a front part and a middle part with a plate material with a cover member. The rear part of the revolving base 7 is fixed to the frame and It is constituted by a counterweight 9 for balancing the weight with the excavator 4 at the front of the swivel 7. The turntable 7 is configured to be turned around a turning axis X by a turn motor 10 (see FIG. 2) supported by a frame of the turntable 7. This backhoe 1 is a so-called small backward turning type,
The rear side surface of the revolving unit 3 is formed in an arc shape so as not to protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 turns, the turning trajectory drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 5.

As shown in FIG. 2, the left and right side surfaces of the revolving unit 3 are formed in a plane extending in the front-rear direction with the revolving unit 3 facing forward. It is formed narrower than the diameter of the turning locus circle drawn by the rear surface. Furthermore, in the same state, the front surface of the revolving unit 3 is formed in a plane along the left-right direction. As shown in FIGS. 1 and 3, a pair of upper and lower support members 11 that support the excavator 4 protrude from the front right side of the swivel 7. A swing bracket 12 is pivotally attached to the support member 11 via a support shaft so as to be able to swing left and right around a vertical axis. The swing bracket 12 is a swing cylinder 1 provided inside the swivel 7.
3 (see FIGS. 1 and 2).

The excavator 4 has a boom 1 whose base is pivotally attached to a swing bracket 12 so as to be swingable about the left and right axes.
4, an arm 15 pivotally attached to the distal end side of the boom 14 so as to be swingable about the left and right axes, and a bucket 16 attached to the distal end side of the arm 15 so as to be free to dump. The boom 14 is swung by a boom cylinder 17 provided between the swing bracket 12 and the middle of the boom 14, and the arm 15 is provided with an arm cylinder 18 provided between the middle of the boom 14 and the base of the arm 15. The bucket 16 is squeezed and dumped by the bucket cylinder 19 provided between the base of the arm 15 and the mounting link of the bucket 16.

The rear upper surface and the right upper surface of the swivel 7 are open, and these open portions are covered with a rounded bonnet 20 projecting upward from the upper surface of the swivel 7. As shown in FIGS. 1 and 2, inside the bonnet 20, an engine 21, a hydraulic pump 23 for driving various hydraulic devices, a hydraulic oil tank 24, and a number of control valves are provided side by side. The hydraulic equipment including the unit 25, the radiator 26, and the like are housed, and these are mounted on the swivel 7. The upper surface on the left side of the swivel 7 is covered with a floor sheet, and a fuel tank 22 for the engine 21 and a battery 27 are housed below the floor sheet.

As shown in FIG. 2, the engine 21 is disposed laterally at the rear of the swivel 7 so that the drive axis thereof is directed to the left and right. A hydraulic pump 23 is directly connected to the left end of the engine 21, and a radiator fan 28 is connected to an upper right portion of the engine 21. The lower shaft for driving the hydraulic pump 23 and the upper shaft for driving the radiator fan 28 are linked by a belt transmission mechanism including a fan belt and a pulley. A swivel joint 29 is provided at the center of rotation of the swivel 7, and the swivel motor 10 is disposed to the right of the joint 32. These members are provided with hydraulic valves (not shown) for control valves constituting the valve unit 25. They are connected by piping.

On the right side of the radiator fan 28, the radiator 26 and the oil cooler 30 are arranged. The oil cooler 30 cools the return oil from the valve unit 25 and returns it to the hydraulic oil tank 24.
An outside air intake is formed on the right side surface of the bonnet 20 corresponding to these heat exchangers.
An exhaust port is formed on the right side surface of the. Thus, the backhoe 1 of the present embodiment employs a suction type in which the radiator 26 and the radiator fan 28 are disposed immediately inside the outside air intake.

As shown in FIGS. 1 and 2, the hydraulic oil tank 24 and the valve unit 25 are arranged on the right side of the swivel 7 and in front of the radiator 26. Among them, the hydraulic oil tank 24 is formed in a substantially rectangular parallelepiped shape whose front-rear direction is longer than the width direction, and is disposed on the front right side of the swivel 7 so that the longitudinal direction coincides with the front-rear direction of the swivel 7. Have been. The hydraulic oil tank 24 is disposed so as to float from the bottom of the swivel 7 by a pair of front and rear support brackets 31, thereby forming a long storage space 32 in the front-rear direction below the hydraulic oil tank 24. .

On the other hand, the valve unit 25 is arranged so that its longitudinal direction (the direction in which the valves are arranged) coincides with the front-rear direction, and does not protrude from each side surface of the hydraulic oil tank 24, and The storage space 3 provided below the hydraulic oil tank 24 in a state separated from the lower surface of the tank 24.
2 is stored horizontally. In this manner, in the present embodiment, the valve unit 25 is stored in the storage space 32 provided below the hydraulic oil tank 24, so that the unit 25 is disposed at the same plane position as the hydraulic oil tank 24, and 7 and the hydraulic oil tank 24
By disposing the valve unit 25 below the valve unit 25, heat generated from the hydraulic oil tank 24 is hardly transmitted to the valve unit 25 side, and an excessive temperature rise of the unit 25 is prevented as much as possible.

As shown in FIG. 3, a pair of left and right traveling system levers 33 for independently controlling the left and right crawler traveling bodies 5 are provided upright at the front of the control unit, as shown in FIG. ,
Each of the traveling system levers 33 is linked to a control valve constituting a part of the valve unit 25 via a link mechanism 34. As shown in FIG. 1, a support frame 35 formed substantially in a gate shape in a front view is provided upright at the rear portion of the swivel 7 so as to straddle the engine 21 largely in the left-right direction. The column of the canopy 42 is fixed.

In this embodiment, the hydraulic oil tank 24
And the valve unit 25 are intensively arranged on the right side of the swivel 7, so that the seat 41 is arranged from the left side of the swivel 7, and the fuel tank 22 and the battery 27 are arranged on the left side of the swivel 7. . That is, the fuel tank 22 is arranged in a state of lying on a relatively wide range from the left side of the swivel table 7 and below the seat 41, and
A main tank portion 22A that deviates from the plane range of 0 is provided. In this manner, the fuel tank 22 is
By arranging it in a wide range on the opposite side from the above, the left and right weight balance of the swivel 7 is effectively ensured while ensuring a large capacity of the tank 22.

In the present embodiment, the case where the present invention is applied to the backhoe 1 that makes a small rearward turn is illustrated. However, the present invention allows the excavator 4 to protrude from the vehicle width of the traveling device 2 when the excavator 4 reaches its highest position. It can also be used for the backhoe 1 that does not have a very small turning.

[0022]

As described above, according to the present invention,
Since the valve unit can be arranged in the same plane position as the hydraulic oil tank so as not to be affected by the heat generated from the hydraulic oil tank as much as possible, the swivel base can be made compact without lowering the durability of the valve unit.

[Brief description of the drawings]

FIG. 1 is a right side view showing an internal mechanism of a rotating body.

FIG. 2 is a plan view showing an internal mechanism of the rotating body.

FIG. 3 is an overall side view of a small turning backhoe (turning work machine).

FIG. 4 is a rear view of the backhoe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe (turning work machine) 2 Traveling device 7 Turning table 21 Engine 23 Hydraulic pump 24 Hydraulic oil tank 25 Valve unit 32 Storage space 33 Traveling system lever 34 Link mechanism

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Yamashita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Toshinori Ichikawa 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house F-term (reference) 2D015 BA04 EB00

Claims (3)

[Claims] A swivel (7) is provided on a traveling device (2) so as to be rotatable around a vertical axis, and a hydraulic pump (2) is provided.
3) The engine (21) connected to the swivel (7)
A hydraulic oil tank (24) for supplying hydraulic oil to the hydraulic pump (23) and a number of control valves for distributing hydraulic oil from the hydraulic pump (23) to various hydraulic working devices And a valve unit (25), which is connected in parallel with the hydraulic oil tank (2), mounted on the turning table (7).
4) A turning work machine characterized in that it is stored laterally in a storage space (32) provided below. The valve unit (25) is provided with a hydraulic oil tank (24) so as not to protrude from each side of the tank (2).
The turning work machine according to claim 1, wherein the turning work machine is disposed in a storage space (32) provided below (4). 3. A traveling system lever (33) for operating the traveling device (2) is linked to a control valve forming a part of the valve unit (25) via a link mechanism (34). Item 3. The turning work machine according to item 1 or 2.