JP2563788Y2 - Backhoe hydraulic piping structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a hydraulic hose group such as a boom cylinder and a bucket cylinder arranged on a swivel table through a swing bracket, thereby allowing a hose group to be flexibly displaced while allowing a reasonable bending displacement behavior of the hose. The present invention relates to a backhoe housed compactly without being bulky.

[0002]

2. Description of the Related Art As a hydraulic piping structure of this kind, as shown in Japanese Utility Model Application Laid-Open No. 2-109851, all hydraulic hose groups are arranged so as to penetrate through the inside of a swing bracket from above to backward. The hose portion between the hydraulic terminal on the boom and the swivel base is configured to be able to cope with the vertical deflection displacement caused by the swinging up and down movement of the boom without difficulty.

[0003]

However, in the above publication, the boom cylinder and the hydraulic terminal are communicated with the bending hose, the relay terminal, and the metal pipe in order to arrange all the hydraulic hoses integrally. It requires an exaggerated piping structure with multiple parts to be connected, and there seems to be room for improvement in terms of downsizing of piping. The purpose of the present invention is to devise a hydraulic hose for the boom cylinder.
The point is to obtain a more compact routing state of the hydraulic hose group in the backhoe of the type that passes through the internal space of the swing bracket.

[0004]

In order to achieve the above object, the present invention provides a pair of supply / discharge hoses for a boom cylinder for raising and lowering a boom by supporting a boom to a swivel table via a swing bracket so as to be able to swing left and right. To the swivel base through the internal space of the swing bracket, pipe hydraulic hoses other than the supply and discharge hoses for the boom cylinder along the top surface of the boom, and route the swivel base through the internal space. And a partition member for restricting interference between the supply / discharge hose and the hydraulic hose group is provided at a position acting on the supply / discharge hose in the internal space or a portion closer to the swivel table than this. .

[0005]

[Operation] In other words, the part of the boom hose, which is a pair of supply / discharge hydraulic hoses of the boom cylinder, from the cylinder is originally located immediately in front of the swing bracket. By directly arranging the hose, the length of the hose can be effectively shortened, which makes it possible to omit the wasteful length of piping by returning to the hydraulic terminal once on the boom as in the related art. . In this structure, the boom hose swings up and down and the swing bracket is displaced back and forth, so that the boom hose and the hydraulic hose group in a fixed position are easily rubbed backward from the internal space. Therefore, by providing a partition member that regulates interference between the boom hose and the hydraulic hose group at a position acting on the supply / discharge hose in the swivel-side portion from the internal space, it is possible to eliminate the friction and prevent the hydraulic hose from being damaged. It is.

[0006]

[Effects of the Invention] Therefore, it is possible to reduce the boom hose and reduce the bulk of the hydraulic hose near the swing bracket, thereby preventing the hydraulic hose from rubbing and reducing the hydraulic piping. did it.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a backhoe, 1 is a crawler traveling device, 2 is a swivel, 3 is a swing bracket, 4 is a swing cylinder, 5 is a boom, 6 is a boom cylinder, 7 is an arm, 8 is an arm cylinder, and 9 is a bucket. 10 is a bucket cylinder, 11 is a service port, and E is an engine.

As shown in FIGS. 1 to 3, the swing bracket 3 is supported around a vertical axis X by a protruding support portion 2a at the front end of the swivel 2 and is piped along the upper surface of the boom 5. The hydraulic hose group H is passed through the internal space S of the swing bracket 3 from above to the rear, and
It is arranged to. The hydraulic hose group H is composed of six bucket hoses, i.e., small-diameter bucket hoses 12,12, small-diameter arm hoses 13,13, and large-diameter service hoses 14,14. Has been stopped. The pair of large-diameter boom hoses 16, 16 extend rearward from the outlets 6 a, 6 a of the boom cylinder 6, penetrate from the right outside of the swing bracket 3, and are routed to the swivel 2 through the internal space S. I have. Projection support 2a
Inside the boom hoses 16, 16
A round bar (corresponding to a partition member) 17 is provided for vertically separating the service hoses 14 and 14 located below the boom hoses 16 and 16.
The service hose 14 and the boom hose 16 do not rub against each other due to the longitudinal displacement. Reference numeral 18 in the swivel base 2 is a clamp for the service hoses 14, 14, and the boom hoses 16, 16, and 19 is a clamp for the bucket hoses 12, 12, and the arm hoses 13, 13.

As shown in FIGS. 4 and 5, the dozer cylinder 2
0 is provided with upper and lower protectors 21 and 22 for protecting the piston rod 20a. Upper protector 2
1, the protector 21 is bolted to the front end of the protector 21 to the boss 20c of the piston rod 20a, and a T-shaped guide 20d protruding from the cylinder cylinder 20b.
Is engaged with the pair of rails 21a, 21a so as to be movable back and forth relative to each other.
The whole is protected in the vertical direction.

[Alternative Embodiment] The partition member 17 may be connected to the swing bracket 3 if necessary.
The partition member 17 may be provided in a state where the boom hose 16 and the other hoses are not rubbed with each other.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a piping structure near a swing bracket.

FIG. 2 is a partially cutaway plan view showing a piping structure near a swing bracket.

FIG. 3 is a perspective view showing a piping structure near a swing bracket.

FIG. 4 is a side view showing the structure of a dozer cylinder portion.

FIG. 5 is a cross-sectional view of a dozer cylinder showing a mounting structure of the protector.

FIG. 6 is a side view of the backhoe.

[Explanation of symbols]

 2 Swivel base 3 Swing bracket 5 Boom 6 Boom cylinder 16 Supply / discharge hose 17 Partition member H Hydraulic hose group S Internal space

 ──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 6-8458 (JP, U) JP-A 2-109851 (JP, U) JP-A 2-109852 (JP, U) JP-A 62- 129459 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A pair of supply / discharge hoses (16) for a boom cylinder (6) for lifting and lowering a boom (1) is supported on a swivel (2) via a swing bracket (3) so that the boom (5) can swing right and left. , (16) are routed through the internal space (S) of the swing bracket (3) to the swivel base (2), and the supply / discharge hoses (16),
The hydraulic hose group (H) other than (16) is connected to the boom (5).
Pipes along the upper surface of the swivel base (2) through the internal space (S), and the supply / discharge hoses (16), (16) and the hydraulic hose group (H) A partitioning member (17) for restricting the interference of the backhoe is provided at a position acting on the supply / discharge hoses (16), (16) in the internal space (S) or in a portion closer to the swivel table than this. Hydraulic piping structure.