JP2003278185A - Short-radius revolving shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a short-radius revolving shovel enabling the effective use of the space of a rotary frame. <P>SOLUTION: This short-radius revolving shovel comprises an engine 81 arranged in the rear part of the rotary frame 8 in a laterally long attitude and an inclined state where both the lateral ends are longitudinally shifted; a hydraulic pump 807 arranged on one end side closer to the rear of both the lateral ends of the engine 81; a radiator 808 and an oil cooler 809 arranged on the other end side closer to the front from the one end side; a fuel tank 86 arranged in the front of the hydraulic pump 807 through a prescribed space; and a working oil tank 82 arranged in the space. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small turning excavator which turns in a state in which a rear end of an upper turning body is barely outside the width of a lower traveling body.

[0002]

2. Description of the Related Art Among small hydraulic excavators, a so-called small swing type shovel in which a rear-end turning radius of an upper revolving structure is set to approximately 1/2 of a width dimension of a lower traveling structure is a rear end of an upper revolving structure is a lower part. 360 with almost no protrusion outside the width of the running body
° Since it can be turned, it is suitable for work in narrow spaces such as urban construction and subway construction.

With respect to such a small turning excavator, there is disclosed a technique of arranging the engine obliquely as disclosed in, for example, Japanese Patent Laid-Open No. 5-125742. Here, the engine is arranged obliquely, and the open / close shaft of the bonnet above the engine and the central axis in the longitudinal direction of the engine are made to intersect with each other to improve the maintainability of the engine.

[0004]

However, in the technique disclosed in Japanese Patent Laid-Open No. 5-125742, the hydraulic pump is connected to one side of the output shaft in the longitudinal direction of the engine and the cooling device is arranged on the other side. ing. A hydraulic oil tank is arranged in front of the cooling device, and a control valve is arranged in front of the hydraulic pump and below the floor.

In such a construction, the hydraulic pump and the hydraulic oil tank are largely separated from each other, which is large because the suction pipe has a maximum diameter in the pipe on the revolving frame and therefore it is difficult to make a fine bend. It requires space. Also, if the control valve is placed under the floor, remove the floor plate or
It is necessary to perform maintenance from a maintenance hole or the like provided on the lower side of the frame, which causes a problem that the maintainability of the control valve deteriorates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a small turning type shovel capable of effectively utilizing a space of a turning frame.

[0007]

The invention according to claim 1 is
An upper revolving structure is mounted on the lower traveling structure so as to be rotatable about a vertical axis, and a rear end turning radius of the upper revolving structure is set to about 1/2 of the width dimension of the lower traveling structure, and the upper revolving structure is rotated. In a small swivel excavator in which equipment is installed on a swivel frame of the body, a power source is arranged at the rear of the swivel frame in a laterally long posture that is long in the left-right direction and in an inclined state in which the left and right ends are displaced forward and backward. A hydraulic pump is disposed on one end side of the left and right ends of the power source, which is closer to the rear side, and a cooling device is disposed on the other end side, which is closer to the front side than the one end side, of the hydraulic pump. A fuel tank is disposed in front of a predetermined space, and a hydraulic oil tank is disposed in the space.
It should be noted that “approximately ½” means that the rear end of the turning frame does not extend outside the width of the lower traveling body or only within ½ of the vehicle width + 10% thereof.

According to the above construction, since the power source is disposed in the rear portion of the revolving frame in a horizontally long posture that is long in the left-right direction and in a tilted state in which both left and right ends are displaced forward and backward,
The space behind the swivel frame of the upper swivel body is almost never occupied by the power source alone. That is, the shape of the power source is almost determined in order to satisfy its function. However, by arranging the power source in such an inclined state, a constant space in front of the side where the power source is retracted from the left-right direction ( It is possible to secure a predetermined space). In that case, for example, a fuel tank having a high degree of freedom in shape can be arranged under the floor of the cab installed in front of the power source, and a large hydraulic oil tank can be arranged in this empty space. In this way, it is possible to give a margin to the equipment arrangement on the revolving frame.

A hydraulic pump is arranged at one of the left and right ends of the power source, which is closer to the rear, and
A cooling device is arranged on the other end side which is closer to the front than the one end side, a fuel tank is arranged in front of the hydraulic pump through a predetermined space, and a hydraulic oil tank is arranged in the space. Therefore, the number of suction pipes on the swing frame is reduced, and in combination with the tilted arrangement of the power source, it is possible to further allow the arrangement of devices on the swing frame.

According to a second aspect of the present invention, in front of the power source, the fuel tank is disposed on one end side and the control valve is disposed on the other end side of the swivel joint disposed at the center of rotation. This makes it possible to effectively use the maximum width of the swivel frame, ensure the capacity of the fuel tank, and improve the maintainability of the control valve.

According to the third aspect of the present invention, if the driver's cab is disposed on the upper surface on the left and right sides of the revolving frame and the fuel tank is disposed below the floor of the driver's cab, other equipment is provided. The layout can be facilitated because the type can be arranged in a place with a high vehicle height.

According to a fourth aspect of the present invention, the hydraulic oil tank is formed in a fan shape that opens toward the outside of the revolving frame in plan view. It is possible to obtain the maximum capacity of the hydraulic oil tank with respect to the fuel tank (or the cab).

According to the fifth aspect of the present invention, if the hydraulic oil tank is formed so that at least a part thereof enters below the hydraulic pump, the tank capacity can be further increased.

According to a sixth aspect of the present invention, the revolving frame has a maintenance opening at an end on the side where the control valve and the cooling device are provided, and a cover portion that covers the opening. If provided, the control valve and the cooling device can be easily maintained by opening the cover portion. In this way, maintenance of the required equipment is facilitated.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a compact hydraulic excavator.
It is a figure which shows the whole so-called small turning type shovel structure.
The vehicle body of the small swing excavator is provided with a lower traveling body 1, an upper rotating body 2 mounted on the lower traveling body 1 so as to be rotatable around a vertical axis, and protruding from a front end portion of the upper rotating body 2. An excavation attachment (not shown) configured by a boom or the like pivotally attached to the work device support portion so as to be swingable left and right,
The undercarriage 1 is composed of a dozer 3 and the like that is pivotally attached to the lower traveling body 1 so as to be up and down.

The lower traveling body 1 is composed of left and right crawler frames 4 and crawlers 5 (both of which are shown on only one side).
The both-side crawlers 5 are individually driven by the left and right traveling motors 7 to travel.

The upper revolving superstructure 2 has a revolving frame 8 whose rear end revolving radius is set to approximately half the width dimension of the lower traveling body 1.
And a counterweight 9, and the revolving frame 8
And a cabin 83 having a substantially closed structure forming an operator's cab,
An engine described later and devices such as a hydraulic pump driven by this engine are installed.

The cabin 83 is formed in the shape of a box having a ceiling, front and rear walls, and left and right side walls as a peripheral wall, and is shielded from the outside air to protect the driver from external noise, dust, etc. It has a closed structure, and an air conditioner 85 is provided to ensure its habitability. The equipment layout in the swivel frame 8, which is a feature of the present invention, will be described in detail below.

FIG. 2 is a view showing a detailed structure of a turning frame of a small turning type shovel according to an embodiment of the present invention.
(A) is a horizontal sectional view and (b) is a vertical sectional view. 2A, the left side is the front side, the right side is the rear side, the same upper side is the right side, and the lower side is the left side.

As shown in FIGS. 2 (a) and 2 (b), the revolving frame 8 has a slightly flat cylindrical trapezoidal shape with the front side cut off, and the floor 84 of the cabin 83 extends from the front side to the center in a substantially left half. (A flat portion in the lower part of the operator's cab) is formed (the broken line in FIG. 2A indicates this floor 84). The revolving frame 8 is set to have a shorter front and rear and a slightly longer left and right as compared with that of a normal type small hydraulic excavator.

In this embodiment, an engine (indicated by E / G in FIG. 2) 81 as a power source at the rear part of the revolving frame 8 has a laterally long posture in the left-right direction, but its longitudinal direction. Is formed so as to form a predetermined angle with the center line of the revolving frame 8 in the left-right direction, and the left and right ends are arranged in a tilted state with the front and rear displaced. Then, a radiator (also R / D) as a cooling device is provided on the right end side (one end side) near the front of the engine 81 in this inclined state.
Oil cooler as the same cooling device as 808 (also O
/ C) 809 are arranged side by side in order toward the outside, and a hydraulic pump (also P) 807 is arranged on the left end side (the other end side) which is rearward of the right end. Swivel joint (also S / J) 8 placed in the center of rotation of the swing frame 8 in front of
Swing motor (S / M) 80 on the right side of 04
3 and a control valve (also C / V) 801 are arranged side by side, and an air conditioner (same as A / C) 85 and a fuel tank 86 are arranged side by side on the left side thereof. A hydraulic oil tank (also H / T) 82 is arranged in a space (corresponding to a predetermined space) formed between the 807 and the fuel tank 86. 802 is an operation pattern switching valve (also M /
V) and 805 are batteries (also BAT).
Here, the devices are arranged around the swivel joint 804, because the fuel tank 86 and the control valve 801 can be arranged close to each other near the outer peripheral wall which is the maximum width of the swivel frame 8, whereby the device can be arranged. This is because the capacity of the fuel tank 86 can be secured and the maintainability of the control valve 801 can be improved.

The engine 81 is, for example, a diesel engine, and a hydraulic pump 807 is connected to the left end of an output shaft extending in the left and right directions. A fan (not shown) is attached to the right end of the radiator 808, and the radiator 808 and the oil cooler 809 are air-cooled by the fan.

The hydraulic oil tank 82 is a steel plate tank for storing hydraulic oil of each hydraulic device. This hydraulic oil tank 8
2 is formed in a fan shape that opens toward the outside of the revolving frame 2 in a plan view so as to be accommodated in a space between the hydraulic pump 807 and the fuel tank 86, which is generated by the oblique arrangement of the engine 81. There is.

Specifically, as shown in FIG. 3, the hydraulic oil tank 82 has a ceiling surface 82a and a bottom surface 82b formed in a fan shape, and a front surface bent with a predetermined curvature along the outer wall of the revolving frame 8. 82c, a right side surface 82d, a rear surface 82e, and a left side surface 82f, each of which has a rectangular shape.

By the way, as shown in FIG. 2B, the hydraulic pump 807 usually has a space below it, but the space may be further utilized.
For example, as shown by the chain double-dashed line in FIG.
A protruding portion 821 may be provided on the lower left side of the rear surface 82e of the second side. The protruding portion 821 has such a height that it can enter below the hydraulic pump 807 and does not come into contact with the main body of the engine 81. As a result, the maximum capacity of the hydraulic oil tank 82 can be obtained. Depending on the arrangement of other devices on the swivel frame 8, the entire hydraulic oil tank 82 may be housed below the hydraulic pump 807.

Although not shown, the fuel filler port extends to the outer peripheral wall of the swivel frame 8, and the tank 82
Can be refueled. Further, the oil drain port is capped at a position accessible from below the swivel frame 8 by the operator, and during maintenance, the operator can remove the cap and collect the oil drain.

In the air conditioner 85, a part of its unit (a condenser and an air conditioner unit are included, but the condenser is ignored here) is projected into the seat stand 87, but most of it is a swivel frame. It is installed under the floor 84 of the eight-cabin 83 (hereinafter, the part set under the floor is simply referred to as an air conditioner 85).

The fuel tank 86 is a tank for storing the fuel of the engine 81, and is made of, for example, a synthetic resin having good workability. Although not shown, the oil supply port extends to the outer peripheral wall of the swivel frame 8 to allow oil to be supplied to the tank 86. The fuel tank 86 is arranged under the floor 84 of the cabin 83 together with the air conditioner 85, but due to its good workability, the layout is easy even in such a narrow place. Then, since other devices can be arranged at a place where the vehicle height is high, the layout thereof is facilitated.

In addition, on the right side of the revolving frame 8, an opening 81 of a size that allows maintenance of the control valve 801, the radiator 808, the oil cooler 809, etc.
1 is provided, and the opening 8 is provided during non-maintenance.
A cover portion 812 for covering 11 is provided. The cover portion 812 is made of a steel plate made of the same material as the outer wall, and is bolted around the opening portion 811 of the outer wall. However, the cover portion 812 may be hinged to the opening portion 811 so as to be openable and closable. Then, by opening the cover portion 812, maintenance of necessary equipment can be facilitated.

In addition, on the revolving frame 8, innumerable pipes and electric cables for connecting the above-mentioned devices and the like are arranged, but their arrangement is not shown in the drawing. However, it goes without saying that the arrangement of each device is determined so that the piping and electric cables are as short as possible.

As described above, in the present embodiment, the engine 81 is arranged in the rear portion of the revolving frame 8 in a laterally long posture that is long in the left-right direction and in a tilted state in which the left and right ends are displaced forward and backward. The space behind the revolving frame of the upper revolving structure is hardly occupied by the engine 81 alone. That is, the engine 81
In order to satisfy its function, the shape is almost decided, but by arranging it in such an inclined state, it is possible to secure a certain space in front of the side where the power source is retracted from the left and right direction. it can. In that case, for example, the fuel tank 86 having a high degree of freedom in shape may be replaced by
A large hydraulic oil tank 82 can be arranged in the empty space below the floor 84 of the cabin 83 installed in front of 1. In this way, it is possible to give a margin to the equipment arrangement on the revolving frame.

A hydraulic pump 807 is disposed at one of the left and right ends of the engine 81, which is closer to the rear, and a radiator 808 and an oil cooler 809 are provided on the other end, which is closer to the front than the one end. Is provided, a fuel tank 86 is provided in front of the hydraulic pump 807 via the above-mentioned predetermined space, and the hydraulic oil tank 8 is provided in this space.
2 is arranged, the number of suction pipes on the swivel frame 8 is reduced, and in combination with the tilted arrangement of the engine 81, it is possible to further allow the arrangement of devices on the swivel frame 8 to have more room. Become.

In the above embodiment, the hydraulic oil tank 8
Although the shape of No. 2 is formed in a fan shape in a plan view, any other shape capable of realizing a large capacity can be adopted. Further, it is needless to say that the entire swivel frame 8 may be arranged in the left-right opposite of the above, or may be a tank having a shape corresponding to such an arrangement.

Further, in the above embodiment, the swing motor 80
3 for control valve 801 and swivel joint 8
However, since the swing motor 803 is not necessarily a large-sized device, the swing motor 803 may be placed in another place.

Further, in the above embodiment, the air conditioner 8
5 is arranged between the swivel joint 804 and the fuel tank 86, but in the case where the cabin 83 is not provided, it is not necessary to equip this air conditioner 85, and in that case, further equipment There will be room for arrangement.

In the above embodiment, the case where the engine 81 is used as the power source has been described.
A power source other than the above may be used. For example, when an electric motor is used as the power source, the radiator 808 as the cooling device becomes unnecessary.

[0037]

According to the first aspect of the present invention, the rear space of the revolving frame of the upper revolving structure is hardly occupied by only the power source. That is,
The shape of the power source is almost decided to satisfy its function, but by arranging it in such an inclined state, a certain space is secured in front of the side where the power source is retracted from the left and right direction. be able to. In that case,
For example, a fuel tank having a high degree of freedom in shape can be arranged under the floor of the cab installed in front of the power source, and a large hydraulic oil tank can be arranged in this empty space.
In this way, it is possible to give a margin to the equipment arrangement on the revolving frame. Further, the number of suction pipes on the swing frame is reduced, and in combination with the inclined arrangement of the power source, it is possible to further allow the arrangement of devices on the swing frame.

According to the second aspect of the present invention, the maximum width of the revolving frame can be effectively utilized for arrangement, the capacity of the fuel tank can be secured, and the maintainability of the control valve can be improved.

According to the third aspect of the invention, the other devices can be arranged at a high vehicle height, so that the layout can be simplified.

According to the fourth aspect of the present invention, it is possible to obtain the maximum capacity of the hydraulic oil tank between the power source and the fuel tank (or the driver's cab) which are arranged in an inclined manner.

According to the invention described in claim 5, the tank capacity can be further increased.

According to the sixth aspect of the present invention, the control valve and the cooling device can be easily maintained by opening the cover portion. In this way
Maintenance of required equipment becomes easy.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a small turning type shovel.

2A and 2B are explanatory views showing the schematic structure under the floor of the cabin of the small turning excavator according to the present embodiment, in which FIG. 2A is a horizontal sectional view and FIG. 2B is a vertical sectional view.

FIG. 3 is a perspective view showing a schematic configuration of a hydraulic oil tank according to the present embodiment.

[Explanation of symbols]

1 Undercarriage 2 Upper revolving structure 8 swivel frames 81 engine (equivalent to power source) 82 Hydraulic oil tank 82a to 82f Each side of hydraulic oil tank 83 cabins (corresponding to the cab) 84 floors 85 Air conditioner 86 Fuel tank 801 control valve 802 Operation pattern switching valve 803 swing motor 804 swivel joint 805 battery 807 hydraulic pump 808 radiator (equivalent to a cooling device) 809 oil cooler (equivalent to a cooling device) 811 opening 812 cover 821 Projection part of hydraulic oil tank

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Okunishi             Kobe, 3-12-4 Gion, Asanan-ku, Hiroshima-shi             Luko Construction Machinery Co., Ltd. Hiroshima headquarters (72) Inventor Hiroshi Morita             Kobe, 3-12-4 Gion, Asanan-ku, Hiroshima-shi             Luko Construction Machinery Co., Ltd. Hiroshima headquarters (72) Inventor Hiroshi Shimogaki             Kobe, 3-12-4 Gion, Asanan-ku, Hiroshima-shi             Luko Construction Machinery Co., Ltd. Hiroshima headquarters (72) Inventor Yoshiyasu Umezu             Kobe, 3-12-4 Gion, Asanan-ku, Hiroshima-shi             Luko Construction Machinery Co., Ltd. Hiroshima headquarters F-term (reference) 2D015 CA00

Claims (6)

[Claims] 1. An upper revolving structure is mounted on a lower traveling structure so as to be rotatable about a vertical axis, and a rear-end turning radius of the upper revolving structure is set to about 1/2 of a width dimension of the lower traveling structure. In addition, in the small turning excavator in which the equipment is installed on the turning frame of the upper turning body, the power source at the rear part of the turning frame has a horizontally long posture in the left-right direction and the left and right ends are displaced forward and backward. The hydraulic pump is arranged in an inclined state, and one of the left and right ends of the power source, which is closer to the rear, is provided with a hydraulic pump, and the other end, which is more forward than the one end, is provided with a cooling device. A small turning excavator characterized in that a fuel tank is arranged in front of the hydraulic pump via a predetermined space, and a hydraulic oil tank is arranged in the space. 2. The fuel tank according to claim 1, wherein the fuel tank is arranged at one end side and the control valve is arranged at the other end side of the swivel joint arranged at the center of turning in front of the power source. Small turning excavator. 3. The small turning excavator according to claim 1 or 2, wherein a driver's cab is arranged on an upper surface on one left and right side of the turning frame, and the fuel tank is arranged under a floor of the driver's cab. . 4. The small swirl type according to claim 1, wherein the hydraulic oil tank is formed in a fan shape that opens outward of the swivel frame in a plan view. Shovel. 5. The small swivel excavator according to claim 1, wherein at least a part of the hydraulic oil tank is formed so as to enter below the hydraulic pump. 6. The swivel frame is provided with a maintenance opening portion at an end portion on a side where the control valve and the cooling device are provided, and a cover portion covering the opening portion. The small turning excavator according to claim 2.