JP2834383B2 - Backhoe swivel 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 backhoe swivel structure, and more particularly to a technique for rationally laying out equipment in a driving unit.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open Publication No. 4-33757, a swivel structure of a small swivel type backhoe has a driving portion such as an engine disposed at a rear portion of the swivel base, and a fuel tank and an operating device are provided on the right side. Generally, an oil tank or the like is arranged to achieve weight balance between the front, rear, left and right and effective use of space.

[0003]

The small turning backhoe is capable of turning with a small radius due to the retracted posture of the boom while being bent down, and is excellent in workability in a narrow place. Further, in order to further extend the advantages, it is necessary to promote downsizing of the swivel base itself. As for the structure of the swivel platform, the control unit is located at the left of the front of the swivel, the tanks are located at the right, the boom connecting part is located at the middle between the left and right, and the engines are located at the rear, and it has penetrated deeply behind. The boom connecting part which is to separate the tank part and the control part is presented. However, since the oil passage connecting the control valve group in the control section and the hydraulic oil tank in the tank section requires a surprisingly large installation space, it is necessary to bypass the boom connection section and pipe through the engine section. Is convenient. However, in the swivel base, mechanical devices such as an engine and a radiator, which are bulky to some extent, are arranged without waste, and hydraulic hoses are piped in a state where the gaps are sewn. It is expected that even that gap cannot be secured. An object of the present invention is to further reduce the size of the swivel base by piping the hydraulic hoses without hindrance by structural measures including the arrangement of each device.

[0004]

In order to achieve the above-mentioned object, the present invention relates to an excavating operation device connected to a left and right intermediate portion at a front portion of a swivel table, and a control unit on one side of the excavating operation device. Further, in a backhoe swivel structure in which a hydraulic oil tank is arranged on the other side and a prime mover is arranged at the rear of the swivel, an engine of the prime mover is installed right and left at the rear of the swivel. Mounted on an engine frame made of
A return hose connecting the control valve for the excavation work device and the hydraulic oil tank arranged in the control section is routed through the internal space of the engine frame.

[0005]

That is, by using a pipe material having sufficient strength for a frame for mounting the engine and passing a return hose through the pipe material, the engine frame has both functions of a strength member and a hose path. Of the connecting oil passages between the control valve and the tank or the hydraulic pump, the return hose that becomes the drain passage for all the oil passages has the largest diameter, so the one that requires the most installation space is originally By passing through the internal space of the pipe material which is the dead space,
It is possible to effectively promote downsizing of the turntable.

[0006]

Therefore, by a simple modification of the engine frame made of pipe material extending to the left and right, a return hose requiring a relatively large installation space can be laid out in the engine without providing a space for it. A rational structure was obtained that could contribute to further downsizing of the swivel base by making the components multifunctional.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an ultra-small swivel type backhoe, where A is an excavating work device, 4 is a swivel table, 5 is a traveling machine stand, and 6 is a crawler traveling device. The excavating work apparatus A is configured to include a boom 1, an arm 2, and a bucket 3. The boom 1 can be bent and displaced freely, and a storage posture in which the bucket 3 is located on the right side of the boom 1 can appear.

As shown in FIGS. 1, 2 and 4, the swivel 4
A steering section 7, a connecting section 8 of the boom 1 and a tank section 9 are arranged from the left in the front, and a driving section B extending left and right is arranged in the rear. The tank section 9 is provided with a hydraulic oil tank 10 and a fuel tank 11 and is covered with a tank cover 12 that can be opened and closed.

The driving portion B is covered with an openable and closable engine bonnet 13 and includes an engine E, a radiator R, a first
The third to third hydraulic pumps P _{1 to} P ₃ are mounted on the mounting frame 14. The mounting frame 14 includes the left and right substrates 14.
a, 14b, front and rear square pipe engine frame 14
c, 14d, the mounting piece 14e, etc. are integrated. The work control valve group V for the excavation work device, the hydraulic pumps P _{1 to} P ₃ , and the hydraulic oil tank 10 arranged in the control unit 7 are connected to each other by four hydraulic hoses 15 to 18. That is, the first and second pumps P ₁ and P ₂ and the first and second pumps P ₁ and P 2
The supply hoses 15 and 16 are for the work control valve V,
With the pump P ₃ and the third hose 17 is pilot valve v of pilot operation, and a single return hose 18 for combining the drainage path of the working control valve V and the pilot valve v.

Three hoses 15, 16, 1 for supplying hydraulic oil
Numerals 7 are vertically arranged using a clamp 20 on a horizontal partition wall 19 for partitioning the driving portion B and the connecting portion 8, and are arranged in a narrow gap between the engine E and the horizontal partition wall 19. The large-diameter return hose 18 is connected to the front engine frame 14.
The hydraulic oil tank 10 is guided to the hydraulic oil tank 10 through the interior c, thereby contributing to the compactness by bringing the horizontal partition wall 19 and the engine E as close as possible. The engine E, a radiator R, an engine ASSY which the hydraulic pump P ₁ to P ₃ is mounted on the engine frame 14, and a control valve ASSY to the assembly control valve V group and the pilot valve v group was the valve block preformed This improves the workability of assembling on the main line in the assembling process.

[Another embodiment] The engine frame 14c is
It is composed of a round pipe, a U-shaped cross section, or a channel material having a substantially F-shaped cross section composed of two sides having a narrow angle, and returns to these closed internal spaces or partially open internal spaces. A structure through which the hose 18 passes may be used, and the channel material having the corner, the round pipe, and the enclosed space that can be piped is collectively referred to as a “pipe engine frame 14c”.

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 accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing the structure of a swivel table.

FIG. 2 is a perspective view showing an engine mounting structure.

FIG. 3 is a schematic diagram of a hydraulic circuit.

FIG. 4 is a side view of the backhoe.

[Explanation of symbols]

 Reference Signs List 4 Turning table 7 Control unit 10 Hydraulic oil tank 14 Engine frame 18 Return hose A Drilling work device B Drive unit E Engine V Control valve

Continuation of front page (56) References JP-A-2-70835 (JP, A) JP-A-1-164343 (JP, U) JP-A-1-164344 (JP, U) JP-A-50-44401 (JP , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02F 9/00 E20F 9/08

Claims (1)

(57) [Claims] An excavating work device (A) is connected to a left and right intermediate portion at a front portion of a swivel (4), and the excavating work device (A)
A backhoe having a control unit (7) on one side and a hydraulic oil tank (10) on the other side, and a driving unit (B) disposed at the rear of the swivel (4). And the engine (E) of the prime mover (B) is mounted on a pipe-made engine frame (14) which is erected right and left at the rear of the swivel (4), and the steering is performed. Department (7)
Control valve (V) for the excavation work device (A) arranged in
A backhoe swivel structure in which a return hose (18) connecting the oil tank and the hydraulic oil tank (10) is routed through the internal space of the engine frame (14).