JP3187710B2 - Backhoe structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body structure of a backhoe, and more particularly, to an arrangement structure of tanks which is advantageous for front-rear weight balance.

[0002]

2. Description of the Related Art A general backhoe is disclosed in JP-A-7-42.
As shown in Japanese Patent Publication No. 195, the structure is such that a driver's seat is arranged at the left front of the swivel, an engine is arranged at the rear, and tanks are arranged at the right. That is, the weight balance in the front-rear direction with respect to the turning center with the excavation work device is obtained by placing the heavy engine at the rear, and the left-right balance is achieved by placing the tanks on the side opposite to the seat in the lateral direction.

[0003]

It is desirable that the turning center of the backhoe is provided relatively relatively in front of the turning table so that the turning center of the backhoe can be easily balanced with the excavating device protruding forward. In some cases, the center of rotation may be set in the center area in front and rear of the swivel table, or slightly toward the rear. In other words, when turning in a narrow place such as an alley or when excavating with a wall behind, it is particularly worrisome that there is a possibility of contact with other objects at the rear of the swivel which is difficult for the operator to visually recognize. This is a small back turning type backhoe in which the turning diameter at the rear of the turning table is within the machine width (within the left and right crawler widths), and only the front side needs to be watched.

Therefore, in order to set the center of rotation more rearward than the conventional swivel base, the swivel base must be further balanced rearward. This is because the distance from the center of rotation to the excavating device is longer than before, and the center of gravity of the backhoe as a whole is closer to the excavating device than before when the swivel table is moved sideways. This tendency is most remarkable, especially when the swivel head is facing sideways. Therefore, since the swivel base has a more rearward balance with respect to the center of rotation than before, it has become necessary to review the layout of components and mechanical devices arranged on the swivel base. In the present invention, in order to realize a small back turning type backhoe without deteriorating the balance, the center of gravity of the swivel table is set closer to the rear than before so that the center of turning can be moved more backward than before. With the goal.

[0005]

[Means for Solving the Problems]

[Structure] The structure according to claim 1 is the structure of the body of the backhoe.
The driver's seat on one side of the turntable and a button on the other side.
Arrange the bonnets and place the engine behind the swivel
Place the fuel tank inside the tank bonnet
And the hydraulic oil tank located behind this fuel tank.
Arrange the shape of the fuel tank and hydraulic oil tank in plan view,
It is long in the left-right direction and short in the front-rear direction.
The left and right ends of the turntable in the front-rear direction in plan view.
The swivel table is formed in a straight line along the
It is characterized in that it is configured to be narrower than the entire width of the traveling device .

[0006] The structure described in claim 2 is the structure of claim 1.
At the tank bonnet,
An openable and closable cover for maintenance is provided .

[Operation] When considering the hydraulic oil tank and the fuel tank, hydraulic oil used for hydraulic equipment such as a boom cylinder and a traveling hydraulic motor is not consumed, whereas fuel is consumed and heavy. Ru der intended to change or lighter or made.
And however, according to the first aspect, in the tank hood, placed before the fuel tank to change in weight,
Since those put after the hydraulic oil tank which is not a change in weight, as compared with the publication described above (JP-A-6-272280), it is possible to the rear lateral deviation of the center of gravity of the swivel base. Therefore, even if the turning center is moved rearward, it is possible to suppress the turning balance of the turning table as much as possible. In addition, it is possible to suppress an increase in the moment acting on the turning center due to the rearward movement of the center of gravity, and it is also possible to suppress an increase in the size of the supporting portion for the turning center, for example, by using a bearing having the same size as the conventional one.

According to the second aspect, maintenance related to the hydraulic oil tank and the fuel tank becomes allow convenient by opening and closing the cover.

[Effect] As a result, in the airframe structure according to the first aspect, the position of the center of gravity as the revolving base can be shifted rearward as compared with the conventional one by a simple layout change such as rearrangement of the hydraulic oil and the fuel tank. It is possible to realize a small back turning type backhoe in which the turning center is moved to the rear while maintaining a good balance in a state where the table is turned sideways and suppressing an increase in the size of the turning center support portion.

According to the second aspect of the present invention, there is an advantage that inspection and maintenance of tanks can be easily performed while obtaining the above-mentioned effects.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a small back turning type backhoe, 1 is a crawler traveling device, 2 is an excavating work device, 3 is a swivel table, 4 is a canopy, 5 is a driving unit, 6
Is a driving unit. The driving unit 6 is composed of three bonnets: a tank bonnet 7 on the right side of the driver's seat 10, an engine bonnet 8 on the rear side, and an auxiliary machine bonnet 9 on the diagonally left and right side. The small rear swing type is a structure in which the center of rotation X is set so that only the turning radius at the rear of the swivel 3 is within the machine width (the left and right crawler widths).

As shown in FIGS. 3 to 8, immediately after the driver's seat 10, there is a base frame 11 for attaching a canopy, and this frame 11 is located at the top of right and left standing pipes 12, 13. It is composed of a sheet metal member mounted over a connecting member 14 installed between the connecting member 14 and a left-standing pipe 15, and a total of four nut portions 16 in front, rear, left and right are formed on the upper surface thereof.

A fuel tank 17 is provided at the right front of the swivel 3.
And a hydraulic oil tank 18 at the rear thereof, and a battery 19 and the like placed in a front-rear direction so as to straddle both left-right tanks 17 and 18 are arranged. Covered. The tank bonnet 7 is arranged so as to cover a stepped portion 11a which is one step down on the right side of the base frame 11, and is bolted to the stepped portion 11a. The central portion of the tank bonnet 7 is constituted by a tank cover 7C that can be opened and closed around a front and rear fulcrum P at the left end thereof.
Inspection and maintenance inside the tank bonnet 7 can be conveniently performed. The material of the tank cover 7C may be a synthetic resin or a sheet metal.

The engine hood 8 for covering the engine 20 and the like is also made of synthetic resin, and can be opened and closed around the left and right axis Q by hinges 21 and 21 at two rear right and left portions of the base frame 11. Easy to do. The accessory bonnet 9 is bolted to the left end of the base frame 11 and contains accessories such as an air cleaner 22 therein.

In other words, the fixed position of the tank and auxiliary hoods 7 and 9 and the openable / closable engine hood 8
Is made of synthetic resin, and the base frame 11 having sufficient strength
To form a curved bonnet surface in combination with the weight 23 at the rear end of the swivel 3. The sheet metal portion on the upper surface of the base frame 11 is exposed to the outside and serves also as an external part.

As shown in FIG. 3, the canopy 4 is substantially V
It consists of a pipe support 24 bent in the shape of a letter and a roof 25 for mud and sunshades. In this structure, the canopy 4 is attached and supported by bolting an attachment portion 26 made of a plate material welded to a lower portion of the support 24 to the nut portion 16 of the base frame 11 described above.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a backhoe.

FIG. 2 is a plan view of a backhoe.

FIG. 3 is a rear view of the backhoe.

FIG. 4 is a plan view showing the shape of the bonnet.

FIG. 5 is a plan view showing a schematic structure inside the hood.

FIG. 6 is a side view showing a mounting structure of the canopy.

FIG. 7 is a rear view of a bonnet portion.

FIG. 8 is a rear view showing the opening and closing structure of the tank bonnet.

[Description of References ] 1 Crawler traveling device 3 Revolving base 7 Tank bonnet 7C cover 10 Operating seat 17 Fuel tank 18 Hydraulic oil tank 20 Engine

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 9/00 E02F 9/08

Claims (2)

(57) [Claims] An operator seat (1) is provided on one side of the swivel (3).
0), and the tank hood (7) respectively arranged on the other side, with disposing the engine (20) to the rear of the swivel base (3), the tank hood (7) in the fuel tank (17 ) And a hydraulic oil tank (18) located behind the fuel tank (17) .
(17) and the hydraulic oil tank (18) in plan view
The shape is long in the left-right direction and short in the front-rear direction.
And the left and right ends of the swivel table (3) are front and rear in plan view.
The swivel (3) is formed in a straight line along the
Narrower than full width of left and right crawler traveling devices (1), (1)
The body structure of the backhoe, which is constructed in a different way . To wherein said tank bonnet (7), wherein both tanks (17), airframe backhoe according to claim 1 which is provided with openable cover for maintenance (7C) against the (18).