JP2001279701A - Piping structure for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure for a working machine solving troubles with breakages and damages regarding a hose by improving a rooting for a hose connecting between a pair of components to be connected freely swingably. SOLUTION: A swivel joint (14), in which a side-edge of an arm (T) of a hose (12) is connected to an upper surface (U) of an arm (2) of another component, is placed inside width to the direction of a swing center shaft line (X1) of a working mechanism (4) by setting its rolling center shaft line (X2) in parallel with the swing center shaft line (X1) of the working mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure of a working machine, and more particularly to a piping structure of a working machine in which a pair of swingably connected members are connected by a hose.

[0002]

2. Description of the Related Art Referring to FIG. 5, a working device 52 having, for example, a quick coupler 51 is provided at the tip of an arm 50 of a typical working machine, for example, a hydraulic shovel.
Are swingably connected by a shaft member 54, and the working device 5
2 is swung between a lower position indicated by a solid line and an upper position indicated by a two-dot chain line by an oscillating link 53 provided on the arm 50. The working device 52 includes a hydraulic cylinder 51a, and a hydraulic pipe 56 from the arm 50 is connected to the hydraulic cylinder 51a. A hydraulic hose 56a is used for a hydraulic pipe 56 at a connection portion between the arm 50 and the working device 52 so as to follow the swing of the working device 52. The hydraulic hose 56a has one end connected to a pipe 56b fixed to the arm 50 and the other end connected to the working device 52.
Is connected to the hydraulic cylinder 51a. The hydraulic cylinder 51a is of a double-acting type, and the piping 56 is connected to each of the head end and the rod end of the hydraulic cylinder 51a, and two pipes are provided in total.

[0003] The hydraulic hose 56a is provided with a margin in length so that the working device 52 is not forcibly pulled or forcibly bent when the working device 52 swings. Piping 56 arranged on the side of
b.

[0004]

The piping structure of the conventional working machine of the above-described embodiment has the following problems to be solved.

[0005] (1) Damage to the hose: When the working device 52 swings, the hose 56a is separated between its two ends by a "tension state (shown by a solid line)" and an approached "slack state (shown by a two-dot chain line).""Bend freely. Therefore, the hose 56a easily contacts the arm 50, the working device 52, and the like. In particular, in the "slack state", the hose 56a
Hangs laterally between the arm 50 and the working device 52,
During the operation, the hose is caught between the arm 50 and the operation device 52 or comes into contact with surrounding obstacles, thereby shortening the life of the hose and causing damage.

(2) Attaching a plurality of working devices to the arm is difficult: When attaching a plurality of working devices to the arm such as the side surface of the arm 50 in addition to the tip end of the arm 50, a hose extending or hanging from the arm 50 56a hinders the mounting of a plurality of working devices.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a technical problem thereof is to improve the routing of a hose connecting between a pair of members that are swingably connected to each other so as to prevent damage to the hose. It is an object of the present invention to provide a working machine piping structure capable of solving a problem.

[0008]

According to the present invention, as a piping structure for solving the above technical problem, there is provided a piping structure of a working machine in which a pair of members which are swingably connected is connected by a hose. One end of the hose is connected to a swivel joint which is a swivel joint of a pipe provided on one of the members, and the swivel joint has its rotation center axis substantially parallel to the swing center axis of the pair of members. A piping structure for a working machine is provided, wherein the piping structure is provided within the width of the one member in the direction of the pivot center axis.

A hose having a piping structure according to the present invention is connected to a swivel joint disposed within the width of one of the members, with the center axis of rotation being substantially parallel to the center axes of refraction of the pair of members. Therefore, the length of the hose can be shortened by rotating the swivel joint, and the hose is bent without hanging down to the side or the like within the width of the member provided.

[0010] In a preferred embodiment, the swivel joint is provided with a rotation restricting means for restricting the range of rotation. The rotation restricting means is provided near the swivel joint and abuts on the hose.

Then, the hose is brought into contact with the rotation restricting means to determine the direction of the bending of the hose.

In a preferred embodiment, one of the pair of members is an arm provided in the working machine, and the other is a working device swingably connected to the arm.

[0013] Then, the hose piping structure between the arm and the working device in the working machine is improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the piping structure of a working machine constructed according to the present invention will be described below in more detail with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, a hydraulic shovel, which is a typical working machine, includes an arm 2 which is one of a pair of members which are swingably connected to each other, and a distal end portion of the arm 2. The working device 4, which is the other of the pair of members, is attached by a shaft member 8 so as to be swingable about a swing center axis X1. The working device 4 is rocked by a rocking link 10 provided on the arm 2 between a lower position shown by a solid line and an upper position shown by a two-dot chain line. The working device 4 includes a bucket device 4b having a quick coupler 4a, and a double-acting hydraulic cylinder 5 is attached to the quick coupler 4a.

The arm 2 and the double-acting hydraulic cylinder 5 are connected by a pair of hydraulic hoses 12 so as to follow the swinging motion of the working device 4. Each of the hoses 12 has an end S on the working device side and the hydraulic cylinder 5.
The arm end T is at the rod end and the head end of the arm 2.
A pair of swivel joints 14 disposed on the upper surface U of
14 respectively. Swivel joint 1
Numeral 4 is provided with its rotation center axis X2 substantially parallel to the swing center axis X1 of the working device 4.

On the upper surface U of the arm 2, a pair of pipes 16, 16 formed of steel pipes extend from the main body of the working machine. A block 16a, which is a pipe joint, is integrally attached to each end of the pipes 16, 16. Block 1
A swivel joint 14 is attached to 6a.

Referring to FIGS. 3 and 4 together with FIGS. 1 and 2, the block 16a has a cubic shape provided with a flow passage therein, and has a swivel joint 1 on one surface thereof.
A port 16b having an internal thread to which the screw 4 is attached is formed. The port 16b is positioned such that when the swivel joint 14 is attached, its rotation center axis X2 is substantially parallel to the swing center axis X1 of the working device 4. The block 16a is attached to the upper surface U of the arm 2 by three bolts 17 (three). Thus, the swivel joint 14 is connected to the swing center axis X1 of the upper surface U of the arm 2.
It is arranged within the width of the direction.

The swivel joint 14 is connected to the rotation center axis X.
2 and a rod-shaped stator 14a in which a flow path is formed.
And a rotor 14b rotatably attached to an outer peripheral portion of the stator 14a. Stator 14a is attached to port 16b of block 16a. Rotor 14
b has a port 14c which has a male thread and protrudes and communicates with the flow path of the stator 14a. The arm T of the hose 12 is connected to the port 14c. Since the swivel joint 14 may be a well-known pipe swivel joint, a detailed description thereof will be omitted.

On the upper surface U of the arm 2 on the side of the swing center axis X1 near the swivel joint 14, a contact member serving as a rotation restricting means for restricting a range of rotation of the swivel joint 14 around the axis X2. 18 are provided. The contact member 18 is formed by cutting a thick plate member into a rectangular shape, and is attached to the upper surface U of the arm 2 by appropriate means such as welding. The contact member 18 controls the rotation of the swivel joint 14 about the axis X2, and the rotation range of the swivel joint 14 in the counterclockwise direction indicated by an arrow 15a in FIG.
It is stipulated in contact with the cap of No. 2. In the present embodiment, the contact member 18 is defined so as to contact the hose 12 at a position substantially parallel to the upper surface U of the arm 2 (FIG. 4).
In a solid line). An abutting member 18 is not provided at the rotating end of the swivel joint 14 in the opposite direction, that is, the end rotating clockwise as indicated by an arrow 15b in FIG. At this end, the hose 12 rotates until it comes into contact with the upper surface U of the arm 2 (the state shown by the two-dot chain line in FIG. 4).

The operation of the working machine piping structure as described above will be described with reference to FIGS.

(1) Swivel joint: In a position where the working device 4 swings downward as shown by a solid line in FIG. 1, the hose 12 is pulled toward the working device 4 and the swivel joint 1
4 is turned to the working device 4 side shown by a solid line in FIGS. When the working device 4 swings from this position toward the upper position shown by the two-dot chain line in FIG.
The swivel joint 14 is pushed in the direction of the arm 2 with the movement of the swivel, and turns to the opposite side shown by the two-dot chain line in FIGS. Therefore, since the swivel joint 14 rotates, it is not necessary to prepare an extra length for the hose 12, and the overall length of the hose 12 can be shortened. The swivel joint 14 has a rotation center axis X2 substantially parallel to the swing center axis X1 of the working device 4, and the swivel joint 14 is arranged within the width of the arm 2 in the swing center axis X1 direction. Therefore, the hose 12 is bent without protruding to the side of the arm 2.

(2) Rotation restricting means: When the working device 4 is swung upward from a position swung downward as shown by a solid line in FIG. It is pushed in the direction of 14. At this time, the swivel joint 14 to which the hose 12 is connected cannot rotate in the counterclockwise direction indicated by the arrow 15a in FIG.
It rotates clockwise as shown by 5b. Therefore hose 12
The bending direction is always positioned in the same direction, and the bending surface is positioned in the same direction.

(3) Hose Damage Prevention: The swivel joint 14 is installed near the swing center axis X1 of the arm 2 and the working device 4, so that the hose 12 for coping with the swinging motion of the working device 4 is provided. Extra length can be reduced. Therefore, damage and breakage due to hanging and overhang of the hose are prevented. Further, the bending radius of the hose 12 is not strict, and the life and breakage of the hose 12 are reduced. By setting the position of the swivel joint 14 as close as possible to the swing center axis X1, the length of the hose 12 can be further reduced.

(4) A plurality of working devices can be easily attached to the arm: Since the hose 12 does not protrude from the side surface of the arm 2 or hang down, a plurality of working devices can be easily attached to the arm 2.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be variously modified or modified within the scope of the present invention. It is.

(1) In the embodiment of the present invention, an arm and a working device of a working machine are disclosed as a pair of members that are swingably connected. The present invention is not limited to the working device, and may be appropriately used between a pair of swingable members such as a connecting portion between the working machine body and the arm.

(2) In the embodiment of the present invention, the contact member that contacts the hose is attached to the upper surface of the arm as the rotation restricting means, but the rotation restricting means restricts the rotation of the swivel joint. Block 16 to which the swivel joint 14 is attached, for example.
a that abuts on the hose 12 to restrict the rotation of the swivel joint 14.

[0029]

According to the piping structure of a working machine constructed in accordance with the present invention, the routing of a hose connecting between a pair of swingably connected members is improved, and problems such as damage to the hose are solved. A work machine piping structure is provided.

[Brief description of the drawings]

FIG. 1 is a side view of a connecting portion between an arm of a working machine and a working device having a piping structure configured according to the present invention.

FIG. 2 is a top view as seen in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged view of a portion of a swivel joint indicated by B in FIG. 2;

FIG. 4 is a side view of the swivel joint as viewed in the direction of arrows CC in FIG. 3;

FIG. 5 is a side view of a piping structure of a conventional working machine.

[Explanation of symbols]

 2: Arm (one of a pair of members) 4: Working device (the other of a pair of members) 12: Hose 14: Swivel joint 18: Contact member (rotation restricting means) U: Upper surface of arm T: Arm side of hose End S: End of hose on working device side X1: Swing center axis X2: Rotation center axis

Claims (4)

[Claims] 1. A piping structure for a working machine in which a pair of members that are swingably connected to each other are connected by a hose, wherein one end of the hose is a swivel that is a swivel joint of the piping provided on one of the members. The swivel joint is disposed within the width of the one member in the direction of the swing center axis with its center axis of rotation substantially parallel to the center axis of swing of the pair of members. A working machine piping structure. 2. The piping structure of a working machine according to claim 1, further comprising a rotation restricting means for restricting a rotation range of said swivel joint. 3. The piping structure for a working machine according to claim 2, wherein said rotation restricting means is provided near said swivel joint and abuts on said hose. 4. The work machine according to claim 1, wherein one of the pair of members is an arm provided on the work machine, and the other is a work device swingably connected to the arm. Piping structure of the described working machine.