JPH1193211A - Backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase tank capacity by forming a recessed part in a housing tank arranged over an upper and lower parts of a step, and housing a backhoe device swinging hydraulic cylinder. SOLUTION: A swing bracket 11 freely swingable around the axis P2 is arranged on a support bracket 40 on the front end of a turning stand 3, and a boom is supported by the bracket 11. Next, a hydraulic cylinder 11A to swingingly drive the bracket 11 is arranged on the right lateral side end lower than a step of an operation part of the turning stand 3. Next, a sideways turning recessed part 21A is formed in a lower end part of a fuel tank 21 arranged in a condition of being projected upward from below the step, and the hydraulic cylinder 11A is arranged in the recessed part 21A. Therefore, the hydraulic cylinder and the fuel tank can be arranged with excellent space efficiency, and since the fuel tank can be extended below the step, tank capacity of the fuel tank can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe having a hydraulic cylinder for oscillating a backhoe device left and right and a storage tank for storing hydraulic oil for a fuel or a hydraulic cylinder or the like.

[0002]

2. Description of the Related Art Conventionally, the arrangement of a hydraulic cylinder and a storage tank is, for example, as shown in Japanese Patent Application Laid-Open No. 7-300879, in which a fuel tank is disposed above a step and a backhoe device is disposed below the step. A hydraulic cylinder that was driven to swing was arranged.

[0003]

Since such a configuration is employed, there is a limit to increasing the fuel tank as long as the fuel tank is arranged above the hydraulic cylinder. SUMMARY OF THE INVENTION An object of the present invention is to provide a backhoe capable of increasing the capacity of the storage tank in the storage tank without changing the basic positional relationship between the storage tank and the hydraulic cylinder.

[0004]

[Means for Solving the Problems]

[Structure] A characteristic structure according to the present invention is that a storage tank is provided over and under a step of an operation unit, and a hydraulic cylinder that swings a backhoe device right and left is disposed below the step, and the hydraulic pressure is stored in the storage tank. The point is that a concave portion is formed to allow the cylinder to enter.
And the effect is as follows.

[Operation] In other words, by forming a concave portion in the storage tank and positioning the hydraulic cylinder in the concave portion, the storage tank can be extended below the step where the hydraulic cylinder is installed. This can increase the tank capacity.

[Effect] Focusing on the fact that the hydraulic cylinder itself is long in the operating direction, but the area occupied in the radial direction around the cylinder is small, and the peripheral portion of the hydraulic cylinder is an empty space. Since a part of the storage tank can be inserted into this portion, the amount of the tank can be increased without changing the positional relationship between the two.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a swivel 3 which rotates around a center P1 is mounted on a traveling frame 2 provided with a crawler traveling device 1, and a backhoe device 4 is provided at the front end of the swivel 3. A backhoe is provided with an operation section 5 in the middle section, a driving section 6, a sunshade 8, and a balance weight 10 in the rear end section.

The backhoe device 4 includes a swing bracket 11 provided on a support bracket 40 at the front end of the swivel table 3 so as to be swingable around an axis P2, a boom 12 pivotally supported by the swing bracket 11, and a tip end of the boom 12. Arm 13 attached, bucket 1 attached to tip of arm 13
And hydraulic cylinders for them, namely, a swing cylinder 11A for the swing bracket 11, a boom cylinder 12A for the boom 12, an arm cylinder 13A for the arm 13, and a bucket 14
And a bucket cylinder 14A.

In the operating section 5, the control tower 1 is located at the front end side.
5, an engine hood 7 is provided on the rear side, a downward recess is formed in the upper wall of the engine hood 7, and a driver's seat 37 is mounted and fixed in the recess. As shown in FIGS. 3 and 5, the engine bonnet 7 forms a driving unit 6, which is housed in a recess formed by hollowing out an intermediate portion of a balance weight 10 provided at the rear end of the fuselage. Hydraulic oil tank 16 and its hydraulic oil tank 1
A battery 17 is disposed above the radiator 6, and a right sideways engine 18 and a radiator 19, an air cleaner 20, and a muffler 9, which are accessories thereof, are disposed in front of the battery 17. A fuel tank 21 is disposed in front of the radiator 19. A turning motor M3 is arranged forward of the turning center P1.

The positional relationship between the sunshade 8 and the engine hood 7 will be described. As shown in FIG. 6, the engine bonnet 7 is formed of an open / close bonnet portion 7A that can swing open and close around the rear fulcrum P3, and a fixed bonnet portion 7B that is supported and fixed to the swivel 3 on the left lateral side. .
A driver's seat 37 is attached and fixed to the opening / closing hood portion 7A, and is configured to swing open and close integrally with the opening / closing hood portion 7A. The opening and closing bonnet portion 7A is a balance weight 1 that constitutes a part of the body frame of the swivel 3.
It is attached to the bracket provided at 0 so as to be swingable around the rear fulcrum P3. As shown in FIGS. 3, 5 and 6, an operation panel 23 is provided on the fixed bonnet portion 7 </ b> B so as to be located on the side of the driver's seat 37.
Has a main switch, an accelerator lever, and other electrical components. A square pipe-shaped vertical frame 24 that forms the base end of a sunshade support pillar erected at the rear end of the left horizontal side portion of the swivel 3, and a front-rear pipe-shaped frame extending forward from the vertical frame 24. 38 extends to support the fixed bonnet portion 7B, and the front end of the front-rear pipe-shaped frame 38 is attached and fixed to a plate-shaped bracket 39 erected on the front end of the swivel 3. Then, a tip portion 24A forming a column extends further upward than the fixed bonnet portion 7B, and the column is independently shaded.
It is made to support. Here, the front end portion 24A and the vertical frame 24 at the base end portion are referred to as supporting columns for sunshade.

As shown in FIG. 5 and FIG. 6, a horizontal arched frame 25 is provided inside the opening / closing bonnet portion 7A so as to extend in the left-right direction of the swivel 3 and is formed of a round pipe. Bracket 2 on the lower right side of 25
6 while being fixed in an upright state, and
5 is attached and fixed to the lateral side surface of the vertical frame 24. The arched frame 25 supports the closed hood portion 7A in a closed state, and the arched frame 25 is arranged to support the portion of the hood portion 7A to which the driver's seat 37 is attached. Near the right end of the arched frame 25, a detachable fixing device 27 as a mechanism for holding the radiator 19 is attached. The fixing device 27 is fitted to the upper end of the radiator 19 to hold the radiator 19, and the radiator 19 is held. 19 touch stops.

The drive structure of the swivel 3 will be described. As shown in FIGS. 3 and 5, an outer race 29 provided on the lower surface of the swivel base 3 is relatively rotatable via a rolling ball member 30 with respect to an inner race 28 fixed to the traveling frame 2. In addition, the swivel table 3 is configured to be rotatable about the swivel center P1, the inner teeth 28A are formed on the inner surface of the inner race 28, and the pinion gear 31 that engages with the inner teeth 28A is attached to the swivel motor M3. The turning motor M3 is attached and fixed to a base frame 3B located below the step 3A of the turning table 3 so that the turning motor M3 turns together with the turning table 3. As described above, since the pinion gear 31 attached to the turning motor M3 is engaged with the internal gear 28A, the turning motor installation position is inevitably located inside the inner race 28, and the empty space is effectively used. Can be achieved.

As shown in FIG. 7, a pair of left and right vertical ribs 33 are erected from the base frame 3B of the swivel base 3 with their longitudinal directions substantially along the front and rear directions of the swivel base. 33 are arranged so as to be narrower toward the front end of the swivel base, and bent portions 33A, 3 are provided at the rear end of the swivel base in the left-right (horizontal direction) direction.
3A, the bent portions 33A, 33A are connected and fixed to the balance weight 10, and the vertical ribs 3A are provided.
3 is extended to the position of the support bracket 40 for the swing bracket 11, and the balance weight 10 and the swing bracket 11 at the front and rear positions of the swivel 3 are integrally connected by the vertical ribs 33. I have. At the left and right ends and the front end of the swivel 3, a side wall and a front wall closing between the base frame 3 </ b> B and the step 3 </ b> A are formed.
It is provided separately from the vertical rib 33.

As shown in FIGS. 2, 4 and 5, a hydraulic cylinder 11A for driving the swing bracket 11 is disposed on the right side of the swivel 3 below the step 3A and protrudes above the step 3A. A horizontal recess 21A is formed at the lower end of the fuel tank 21 arranged in the state, and a hydraulic cylinder 11A is provided in the horizontal recess 21A.
Is located. As a result, the hydraulic cylinder 11A and the fuel tank 21 can be arranged and configured with good space efficiency.

Next, the hydraulic operation structure will be described. As shown in FIG. 8, a hydraulic control valve group for the backhoe device 4 and the like is disposed below the step 3A in the swivel base 3 and at the left front end position of the swivel base 3, and is arranged rearward with respect to the swivel center P 1. A swing motor M3 is provided on the front side of the engine 18, and a hydraulic control valve group is arranged further forward of the swing motor M3. As shown in FIG.
In this hydraulic control valve group, V1 and V2 are control valves of the traveling hydraulic motors M1 and M2, V3 is a control valve of the swing hydraulic motor M3, V4 is a control valve of the boom cylinder 12A, V5 is a control valve of the arm cylinder 13A, V6 is a control valve for the bucket cylinder 14A, V7 is a control valve for the swing cylinder 11A, V8 is a control valve for the dozer cylinder 22A for the dozer 22, and V9 is a control valve for extracting auxiliary power, which is connected to the rear end of the engine 18. Fixed hydraulic pumps 34, 34
It is configured to control the pressure oil from The boom cylinder 12A, the arm cylinder 13A, and the bucket cylinder 14A are referred to as hydraulic actuators of the backhoe device 4.

As shown in FIG. 3, the traveling hydraulic motor M
The control valves V1 and V2 of the M1 and the M2 are mechanically linked to the manual operation levers 35 and 35 via a link mechanism and the like so as to be operated by the manual operation levers 35 and 35 provided on the control tower 15. is there. And the spool movement direction of the control valves V1 and V2 is set so as to be in the vertical direction.
Manual operation lever 3 located above control valves V1 and V2
The link mechanism or the like that links the first and the fifth and the third can be made to have a simple structure. Control valves V3, V4, V5 for other operations
V6 is a left and right cross swing type manual operation lever 42, 42.
This is a hydraulic pilot type control valve operated by.

The output end of the hydraulic control valve group is provided on the rear surface, and the hydraulic cylinder 1 attached to the backhoe device 4
A hydraulic pipe (hydraulic hose) 36 for supplying pressurized oil to 2A, 13A and 14A is arranged so as to ride over the vertical rib 33 on the left side, bypass the back of the turning motor M3 and reach the backhoe device 4.

[Other Embodiments] The present invention may take the following forms in addition to the above embodiments. As the recessed portion 21A provided in the storage tank, not only a laterally recessed portion but also an upwardly or diagonally recessed portion,
An arrangement configuration that straddles the hydraulic cylinder 11A may be adopted. Although the fuel tank 21 is employed as the storage tank, a hydraulic oil tank may be used.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe.

FIG. 2 is an overall front view of the backhoe.

FIG. 3 is a longitudinal left side view of the backhoe.

FIG. 4 is a partially cutaway right side view of the backhoe.

FIG. 5 is a cross-sectional plan view of the engine hood.

FIG. 6 is a plan view showing an engine bonnet.

FIG. 7 is a plan view showing linkage between a vertical rib, a balance weight, and a swing bracket.

FIG. 8 is a plan view showing a positional relationship between a pipe extended from a control valve group and a swing motor.

FIG. 9 is a hydraulic circuit diagram.

[Explanation of symbols]

 3A Step 4 Backhoe device 5 Operating part 11A Hydraulic cylinder 21 Storage tank 21A Recessed part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Seiichi Hashi 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Takafumi Wada 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Katsuhiko Yukawa 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Jin 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture In Kubota Sakai Plant, Inc.

Claims (1)

[Claims] A storage tank is provided above and below a step of an operation unit, and a hydraulic cylinder for oscillating a backhoe device left and right is disposed below the step, and a recess for inserting the hydraulic cylinder into the storage tank. Backhoe forming the entrance.