JP2003278186A - Working machine and slip ring for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize the intrinsic working ability of a working machine by avoiding the interference of a working unit with a slip ring, and to facilitate the mounting, maintenance and wiring work of the slip ring. <P>SOLUTION: The slip ring 21 for performing the transfer of power or electric signal between the outside and inside of the working machine is provided in a position out of the rotating center in a super structure, and external wiring B is connected to a terminal 33 from the circumferential side of the slip ring 21. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine such as a hydraulic excavator or an excavator constructed by using the shovel as a mother body, and a slip ring for connecting electrical wiring used in the work machine.

[0002]

2. Description of the Related Art A conventional technique will be described by taking a hydraulic excavator as an example.

FIG. 5 shows an upper structure of a hydraulic excavator, in which an upper revolving structure 1 is mounted on a lower traveling structure so as to be rotatable around a vertical axis O, and a working device (excavation attachment. (Only the boom 2 is shown). 3 is a cabin.

In this hydraulic excavator, a swivel joint 4 is provided at the center of swing of the upper swing body 1.
The swivel joint 4 exchanges oil and other fluids between the lower traveling structure and the upper revolving structure 1.

When electric equipment (for example, an electric motor in an electric hydraulic excavator) is mounted on the upper swing body 1, in order to connect the internal wiring connected to this electric equipment and the external wiring connected to an external power source or the like. A slip ring 5 is provided coaxially with the swivel joint 4 and above the joint 4.

As shown in FIG. 6, the slip ring 5 is a hollow shaft body 6 provided on a vertical axis O which is the center of rotation.
, A plurality of conductive rings 8 mounted on the outer periphery of the shaft body 6 through insulating disk 7, and the conductive ring 8
... and a plurality of brushes 11 provided on the inner circumference of the case 9 via the brush holder 10 in a state of being in contact with the case 9 provided on the outer circumference side and the conductive ring 8 from the outer circumference side.
The shaft body 6 is attached to the lower traveling body side as the fixed side, and the case 9 is attached to the upper revolving body side as the rotating side.

The internal wiring A on the rotating side and the external wiring B on the stationary side are electrically connected by the conductive rings 8 as a brush device and the brushes 11.

The input terminals 1 are provided on the conductive rings 8 ...
2. Each brush 11 ... Is provided with an output terminal 13, and the external wiring B is connected to the input terminal 12 and the internal wiring B is connected to the output terminal 13.

Here, the external wiring B is connected to the input terminal 12 through the center hole 6a of the shaft body 6 communicating with the center hole (not shown) of the swivel joint 4 of FIG.

[0010]

However, according to such a connection method, as shown in FIG.
Are close to the base end of the boom 2 and interfere with each other when the boom 2 is raised, so that the maximum standing angle of the boom 2 is regulated, and the original work capacity of the shovel is reduced. In FIG. 5, the original maximum boom rising angle is shown by a broken line, and the restricted boom maximum standing angle is shown by a two-dot chain line.

In particular, according to the conventional connection method, since the external wiring B is bent from the central hole 6a of the shaft body 6 to the outer peripheral side and connected to the input terminal 12, the external wiring B is connected to an external power source. In the case of a large-diameter electric wire having a diameter of 50 to 60 mm2, the diameter of the shaft body 6 must be increased because the bending arc becomes large.

Therefore, since the entire slip ring 5 is large, interference with the boom base end is likely to occur, and the maximum boom upright angle is greatly reduced.

(A) The slip ring 5 must be installed in a narrow place in the center of turning, (b)
In this narrow space, the external wiring B must be bent and pulled out from the shaft body central hole 6a as described above, and the empty space must be sewn to be connected to the input terminal 12. Connection work of the power cable of diameter) was troublesome and inconvenient for maintenance.

Therefore, the present invention makes use of the original working capacity of the machine while avoiding the interference between the working device and the slip ring, and
(EN) Provided is a working machine in which a slip ring can be easily attached, maintenance can be easily performed, and wiring connection work can be simplified.

The present invention also provides a slip ring for a working machine, in which external wiring can be easily connected to an input terminal and the overall diameter can be reduced.

[0016]

An invention (work machine) according to claim 1 is a lower traveling body, an upper revolving body mounted on the lower traveling body so as to be rotatable around a vertical axis, and the upper revolving body. And a slip ring for connecting internal wiring on the machine side and external wiring introduced from outside the machine, the slip ring comprising: i. A fixed part, a rotating part rotatably coupled to the fixed part about a longitudinal axis, and a brush device electrically connecting the fixed part and the rotating part, ii. The upper revolving structure is attached to the upper revolving structure at a position deviated from the center of revolving of the upper revolving structure.

According to a second aspect of the present invention, in the structure of the first aspect, the fixed portion of the slip ring is provided with an input terminal to which an external wiring is connected, and the external wiring is connected to the input terminal from the outer peripheral side of the slip ring. It was done.

According to a third aspect of the present invention, in the configuration of the second aspect, the input terminal is constituted by an outer terminal, an inner terminal connected to the brush device, and a conductor connecting the both terminals, and external wiring. Is connected to the outer terminal.

According to the invention of claim 4 (slip ring), an upper revolving structure is mounted on the lower traveling structure so as to be rotatable about the vertical axis, and a work device is attached to the upper revolving structure. A slip ring used in a machine, in which a rotating portion to which internal wiring is connected is rotatably coupled around a vertical axis to a fixed portion to which external wiring is connected, and between the fixed portion and the rotating portion. Is provided with a brush device for electrically connecting them, and the fixed portion is provided with an input terminal to which external wiring is connected from the outer peripheral side of the slip ring. The input terminal is directly connected to the external wiring. It is composed of an outer terminal, an inner terminal connected to the brush device, and a conductor connecting between the both terminals.

According to the construction of claims 1 to 3 (work machine), the slip ring is provided at a position deviated from the turning center of the upper swing body, so that the slip ring does not interfere with the working device (for example, boom) as the installation position. By selecting the position, it is possible to make the best use of the working ability of the working machine.

Further, since the slip ring can be installed not in the center of rotation where there are many space restrictions but in any place convenient for installation and convenient for wiring work and maintenance, the machine can be assembled. The work and the connection work of the electric wiring are facilitated, and the maintenance is convenient.

On the other hand, according to the working machine of claims 2 and 3, and the structure of the slip ring of claim 4, since the external wiring is connected to the input terminal from the outer peripheral side of the slip ring, the external wiring is connected from the center side of the slip ring. Compared with the case, it is not necessary to forcibly bend and connect a particularly thick power cable, which simplifies the wiring connection work.

Further, since the central hole of the slip ring, which has been the introduction path for the external wiring, can be made small, the diameter of the entire slip ring can be reduced. For this reason,
In particular, it is advantageous for a small machine that does not have enough space even at a place off the turning center.

Further, the center hole can be used as a passage for other fluid such as water or air.

According to the third and fourth aspects of the invention, the input terminal is composed of the outer terminal to which the external wiring is connected, the inner terminal to which the brush device is connected, and the conductor which connects the both terminals. Therefore, the orientation relationship between both the outer and inner terminals can be freely set to one that facilitates connection in accordance with the introduction direction of the external wiring and the wiring connection direction with respect to the inner terminal. For example, when the introduction direction of the external wiring and the wiring connection direction with respect to the inner terminal are orthogonal to each other, the outer terminal and the inner terminal are orthogonally arranged, so that bending of the external wiring becomes unnecessary. Therefore, the wiring work becomes easier and
The diameter of the slip ring can be further reduced.

[0026]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS.

First Embodiment (see FIGS. 1 to 3) Here, a hydraulic excavator is taken as an example of the application.

As shown in FIGS. 1 and 2, a swivel joint 4 is provided at the center of swing of the upper swing body 1, and at a position deviated from the center of swing of the upper swing body 1 (in the illustrated example, behind the cabin 3). A slip ring 21 is attached via a mounting base 22.

In FIGS. 1 and 2, the same parts as those of the conventional shovel component shown in FIG. 5 are designated by the same reference numerals, and their duplicate description will be omitted. Further, in FIG. 2, reference numeral 23 denotes a switchboard provided on the upper swing body 1, which is a slip ring 21.
The internal wiring A derived from is connected to electrical equipment such as an electric motor (not shown) via the switchboard 23.

The structure of the slip ring 21 will be described with reference to FIG.

Reference numeral 24 is a shaft as a fixed part, and 25 is a case as a rotating part arranged on the outer periphery of the shaft 24 and attached to the mounting base 22, which are opposed to each other by bearings 26 on both sides in the axial direction. It is rotatably connected. 24
a is a central hole of the shaft body 24.

A disk 27 made of an insulator is provided around the shaft 24.
A plurality of conductive rings 28 ... Are attached via. The brushes 30 provided on the inner circumference of the case 25 via brush holders 29.

A cylindrical body 31 is attached to the upper end of the shaft body 24, and an end plate 32 is attached to the upper end of the cylindrical body 31, and the outer terminals 33 of the input terminals are mounted on the side wall of the cylindrical body 31 and the clamper 34 is attached to the end plate 32. Are provided respectively.

The outer terminals 33 are provided in the slip ring diametrical direction (horizontal direction), and the outer terminals 33 and the inner terminals 35 provided on each conductive ring 28 ... (corresponding to the input terminal 12 in FIG. 6). And are respectively connected by conductors 36 (only one is shown here).

The end portions of the external wiring B are clamped together by the clamper 34 together with the coating, separated under the clamper and connected to the outer terminals 33.

Here, an example is shown in which the external wiring B is introduced from above in a substantially vertical posture and fixed to the clamper 34, bent at approximately 90 ° in the lower portion of the clamper and connected to the outer terminals 33.

However, when the wiring B is introduced into the slip ring 21 in the same horizontal direction as the outer terminal 33 or in a horizontal posture at a right angle, a clamper 34 is provided in the horizontal direction to clamp the wiring end portion, and then the clamper 34 is removed. Outer terminal 3 as it is, or by bending it approximately 90 degrees horizontally
3 may be connected.

On the other hand, the case 25 is provided with connection terminals 37 ... For internal wiring, and the connection terminals 37 ...
0 (brush holders 29 ...) Output terminals 38 ... Are connected by conductors 39.

With this connection structure, the external wiring B-the outer terminal 33 of the input terminal-the same inner terminal 35-the conductive ring 28-
Brush 30-Output terminal 38-Connecting terminal 37-Internal wiring A
Electric power or electric signals are transferred from outside the machine to inside the machine along the route.

When the upper revolving structure 1 revolves around the vertical axis O, the entire slip ring 21 rotates about the vertical axis O while the case 25 (brush 30 ...) And the shaft body 2 are rotated.
4 (conductive ring 28 ...) Relatively rotates around the center of the slip ring, and these connected states are secured.

In this hydraulic excavator, since the slip ring 21 is provided at a position deviated from the swing center of the upper swing body 1 as described above, a position where the slip ring 21 does not interfere with the base end portion of the boom 2 is installed. The position can be freely selected.

Therefore, the boom 2 is attached to the slip ring 21.
You can stand up to the original maximum standing angle without being disturbed by, and make full use of the shovel's original working ability.

Further, the slip ring 21 can be installed at an arbitrary position (for example, the position shown in FIGS. 1 and 2) which is off the center of rotation and is easy to install and convenient for wiring work and maintenance. The machine assembling work and the electric wiring connecting work become easy, and the maintenance becomes convenient.

Further, the external wiring B is connected to the slip ring 21.
To connect to the outer terminal 33 of the input terminal from the outer peripheral side of
Compared to the case of connecting through the central hole 24a of the shaft body 24, even in the case of a thick power cable, it is possible to gently bend and connect with a sufficiently large radius of curvature. Therefore, the wiring connection work is simplified.

Further, since wiring is not passed through the center hole 24a of the shaft body 24, the center hole 24a is made much smaller than the conventional center hole 6a of the shaft body shown in FIG. Slip ring 2
1 The overall diameter dimension can be reduced. For this reason, it is particularly advantageous for a small excavator that does not have enough space even if it is off the turning center (for example, a rear small turning type shovel in which the rear end of the upper turning body turns within the width of the lower traveling body). Become.

By the way, the central hole 24a of the shaft body 24 can be eliminated as described above.
May be used as a passage for passing water for sprinkling or air for excavation.

In this case, for example, an external pipe for water or air may be connected to the lower opening of the center hole 24a, and an internal pipe on the machine side may be connected to the upper opening via a simple swivel joint.

Second Embodiment (see FIG. 4) Only differences from the first embodiment will be described.

In the first embodiment, the external wiring B having a substantially vertical posture is bent under the clamper 34 by approximately 90 ° and connected to the horizontal outer terminal 33, whereas in the second embodiment, the external wiring B is connected. A terminal box 40 is provided on the outer periphery of the cylindrical body 31 so as to project toward the external wiring B side, and an outer terminal 41 to which the external wiring B is connected in a substantially vertical posture is provided in the terminal box 40. The inner terminal 35 is connected by a conductor 42.

This eliminates the need to bend the external wiring B, which simplifies the wiring work. Further, since the bent portion of the external wiring B is eliminated, the slip ring 2
The diameter of the whole 1 can be reduced further.

By the way, in the above embodiment, the hydraulic excavator is taken as an example to which the present invention is applied. However, the present invention can be applied to various working machines (for example, an excavator and a crusher) which have the hydraulic excavator as a base and replace the attachment. Can be applied.

[0052]

As described above, according to the inventions of claims 1 to 3, since the slip ring is provided at a position deviated from the center of rotation of the upper revolving structure, a position where the slip ring does not interfere with the working device is set as this installation position. By selecting, it is possible to make the most of the working capacity of the working machine.

Further, since the slip ring is loosely restricted in space and can be easily installed, it is possible to install the slip ring at any place convenient for wiring work and maintenance. Connection work becomes easy and convenient for maintenance.

On the other hand, according to the invention of claims 2 and 3 in which the external wiring is connected to the input terminal from the outer peripheral side of the slip ring, a particularly thick power cable is forcibly bent as compared with the case of connecting from the center side of the slip ring. Wiring connection work becomes easy because there is no need to connect them by wire. Since the central hole of the slip ring can be made small, the diameter dimension of the entire slip ring can be reduced. For this reason, it is particularly advantageous for a small machine that does not have enough space even at a place off the turning center. The central hole can be used as a passage for other fluids such as water and air.

According to the third and fourth aspects of the invention, the input terminal is composed of an outer terminal to which external wiring is connected, an inner terminal to which the brush device is connected, and a conductor which connects the two terminals. Therefore, it is possible to freely set the orientation relationship between the outer and inner terminals to one that facilitates connection in accordance with the introduction direction of the external wiring and the wiring connection direction with respect to the inner terminal. For example, when the introduction direction of the external wiring and the wiring connection direction with respect to the inner terminal are orthogonal to each other, the outer terminal and the inner terminal are orthogonally arranged, so that bending of the external wiring becomes unnecessary. Therefore, the wiring work becomes simpler and the slip ring diameter can be further reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a slip ring according to a first embodiment of the present invention and an upper structure of a hydraulic excavator on which the slip ring is mounted.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged vertical sectional view of the slip ring according to the first embodiment.

FIG. 4 is a view corresponding to FIG. 3 of a slip ring according to a second embodiment of the present invention.

FIG. 5 is a view showing a conventional slip ring and an upper structure of a hydraulic excavator on which the slip ring is mounted.

FIG. 6 is an enlarged vertical sectional view of a conventional slip ring.

[Explanation of symbols]

1 Upper revolving structure O Vertical axis that is the center of turning 2 Work equipment boom 21 slip ring 24 Shaft that is a fixed part Case of 25 rotating parts 28 ... Conductive ring constituting brush device 29 Same brush holder 30 same brush 33 Outer terminals that form input terminals 35 Same inner terminal 36 Same conductor 38 output terminals 41 Outer terminal 42 conductor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masatoshi Hara             Kobe, 3-12-4 Gion, Asanan-ku, Hiroshima-shi             Luko Construction Machinery Co., Ltd. Hiroshima headquarters F-term (reference) 2D015 DA03

Claims (4)

[Claims] 1. A lower traveling body, an upper rotating body mounted on the lower traveling body so as to be rotatable about a vertical axis, a working device attached to the upper rotating body, internal wiring on the machine side, and a machine. It comprises a slip ring for connecting with external wiring introduced from the outside, the slip ring comprising: i. A fixed part, a rotating part rotatably coupled to the fixed part about a longitudinal axis, and a brush device electrically connecting the fixed part and the rotating part, ii. A working machine, wherein the work machine is attached to the upper swing body at a position deviated from a swing center of the upper swing body. 2. The fixed portion of the slip ring is provided with an input terminal to which an external wiring is connected, and the external wiring is connected to the input terminal from the outer peripheral side of the slip ring. Work machine. 3. The input terminal is constituted by an outer terminal, an inner terminal connected to the brush device, and a conductor connecting between these terminals, and external wiring is connected to the outer terminal. The working machine according to claim 2. 4. A slip ring for use in a work machine configured such that an upper revolving structure is mounted on a lower traveling structure so as to be rotatable about a vertical axis, and a working device is attached to the upper revolving structure. , A rotating portion to which the internal wiring is connected is rotatably coupled to a fixed portion to which the external wiring is connected, and a brush which electrically connects them between the fixed portion and the rotating portion. A device is provided, and the fixed portion is provided with an input terminal to which external wiring is connected from the outer peripheral side of the slip ring. The input terminal is connected to an outer terminal to which the external wiring is directly connected and a brush device. A slip ring for a working machine, which is composed of an inner terminal and a conductor connecting the both terminals.