JP3119590B2 - Rotary joint structure for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of construction machines such as hydraulic shovels used for various construction works and civil works.

[0002]

2. Description of the Related Art In general, among construction machines of this type, there is a construction machine in which an upper revolving unit is pivotably supported above a lower traveling unit, such as a hydraulic excavator. A hydraulic power source for supplying hydraulic oil to various hydraulic actuators such as a hydraulic motor for traveling, a hydraulic motor for turning, and a hydraulic cylinder for front attachment is mounted, and the driving of the hydraulic source is performed from a power supply source installed outside the machine. There is one configured to perform the operation using supplied power. In this case, the power supply from the power supply source to the hydraulic power source is performed via a cable, but if the cable is directly connected to the hydraulic power source, the cable is wound or entangled with the turning of the upper rotating body. There's a problem.
Therefore, there is a type in which a cable extending from a power supply source is wound around a winding device provided on a lower traveling body, and the cable is further guided from the winding device to a hydraulic source of an upper rotating body. In this case, electric transmission / reception between the lower traveling body side and the upper revolving superstructure side needs to be performed via a rotary joint provided at the center of rotation between the upper revolving superstructure and the lower traveling body.
Therefore, conventionally, as shown in FIG. 3, a brush 21 and a rotary joint 30 each composed of an outside body 28 and an inside body 29 for transmitting and receiving hydraulic oil between the upper revolving unit and the lower traveling unit. An electric transmission / reception unit 30B including the slip ring 26 is provided.

[0003]

However, the conventional rotary joint 30 is provided with a frame 17 on the upper rotating body side.
The hydraulic fluid transmission / reception unit 30A is provided so as to protrude upward from the upper side, and the electric transmission / reception unit 30B is provided above the hydraulic oil transmission / reception unit 30A.
Hydraulic oil piping 20 and electrical wiring 12
Since B is concentrated, piping and wiring work are troublesome and complicated, and workability of maintenance work such as maintenance is inferior. Therefore, there is a problem to be solved by the present invention. In the rotary joint, an outside body fixed to the upper revolving body side is externally fitted to an inside body fixed to the lower traveling body side so as to be rotatable around a pivot axis.
The inside body 29 having a plurality of hydraulic oil passages is formed such that the electric wiring path 31 penetrates the center portion of the inside body 29 in the axial direction, and surrounds the outer periphery of the electric wiring path 31. 32 had been formed. For this reason, there is also a problem to be solved that the entire inside body 29 has a large diameter corresponding to the electric wiring path 31, which is contrary to the reduction in weight and size.

[0004]

The present invention SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, be one that is created for the purpose of solving these problems, turning the upper swing body to the undercarriage
In a construction machine supported rotatably via bearings , an upper revolving unit is provided on a revolving shaft of an upper revolving unit to transmit and receive hydraulic oil and electricity between the lower traveling unit and the upper revolving unit. A rotary joint comprising an outside body and an inside body fixed to a lower traveling body frame fixed to a frame is provided. The rotary joint includes a hydraulic oil transmitting / receiving portion between the outside body and the inside body and an electric When providing the transmitting and receiving part, the rotary joint is
Rotary jog that projects upward and is stored on the upper revolving unit side
Projecting downward from the upper half of the int and upper pivot frame
Rotary joint stored in the lower traveling frame
Lower half and with constituting at, arranged said hydraulic fluid transmission and reception unit to B over data <br/> on Li joint half side, the rotary joint in a construction machine of the electric transmission and reception unit arranged to B over Tari joint lower half side Structure. By doing so, the conventional rotary joint as a whole is moved upward from the upper revolving structure frame and the hydraulic oil pipes are placed in a narrow space on the upper revolving structure frame such as those received even in a hanging state. gone that electric wiring, such as concentrates, piping, wiring work and maintenance work is improved workability becomes easy. Further, Rotarijo electrical transmitting and receiving unit is arranged
The lower half of the int is formed on the inner peripheral side of the slewing bearing
It is stored on the lower traveling body side by effectively utilizing the dead space
Therefore, the rotary joint on the undercarriage side
There is no need to secure a separate space for this, which is convenient.
In this device, the lower half of the rotary joint has an electric wiring path and an electric transmission / reception section formed on the outer peripheral side of the hydraulic oil path connected to the hydraulic oil transmission / reception section. Easy to do. Further, in the case where the inside body is formed by externally fitting and fixing an outer body on which an electric wiring path and an electric transmitting / receiving portion are formed to an outer peripheral lower half portion of a body main body on which a hydraulic oil path is formed, The structure is such that the working oil pressure does not work on the outer body, and as a result, the body body where the working oil pressure works can be made smaller in diameter than the conventional one in which the electric wiring path is formed through the central part in the axial direction. The outer body can be made thinner or made of a lighter material, which contributes to the reduction in weight and size of the entire rotary joint. Such a rotary joint is configured such that, for example, a power supply source is connected to the lower traveling body side, and power from the power supply source is supplied to a hydraulic source mounted on the upper swing body via the rotary joint. Can be used for hydraulic excavators.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a crawler-type lower traveling body 2, an upper revolving body 4 that is rotatably supported above the lower traveling body 2 via a revolving bearing 3, Upper revolving superstructure 4
The left and right traveling motors and the slewing motors (both are shown in the drawings) are formed from hydraulic pumps 6 mounted on the upper slewing body 4. ), The basic configuration of the operation of various hydraulic actuators such as the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9 is the same as the conventional one.

Reference numeral 10 denotes an electric motor for driving the hydraulic pump 6. This electric motor is disposed at a portion of the upper swing body 4 adjacent to the hydraulic pump 6, and the electric power supply to the electric motor 10 is as follows. Cable 12A, rotary joint 13, cable 1 from power supply source 11 installed outside the body
It is configured to be performed via 2B.

That is, the cable 12A has one end connected to the power supply source 11 and the other end connected to the inside body 15 of the rotary joint 13 via a cable winding device 14 provided on the lower traveling body 2. Have been. The cable 12B has one end connected to the outside body 16 of the rotary joint 13 and the other end connected to the electric motor 10.

Further, the rotary joint 13 is provided on a revolving shaft of the upper revolving unit 4, and is constituted by using the inside body 15 and the outside body 16 described above. An upper half 16X of a cylindrical body having an opened lower side, and a lower half 16Y of a cylindrical body having an upper end integrally fixed to a flange 16a formed on the outer periphery of the lower end of the upper half 16X of the body. And is formed from In the outside body 16, the upper half 16X of the body is accommodated in the upper revolving unit 4 by fixing the flange portion 16a to the upper revolving frame 17, and the lower half 16Y of the body is connected to the lower traveling unit. In a state of being stored on the two sides, it is integrally fixed to the upper swing body 4 side. Reference numeral 3a denotes an outer race fixed to the lower surface of the upper revolving structure frame 17, and 3b denotes an inner race fixed to the upper end of the lower traveling frame 18. Both the races 3a and 3b and the ball bearing are used. The swing bearing 3 is constituted by 3c.

Further, a plurality (four in the present embodiment) of hydraulic oil ports 19 are formed in the upper half portion 16X of the outside body 16 in a vertical direction. 19 is connected to a pipe 20 connected to the hydraulic pump 6 or an oil tank (not shown) via a control valve (not shown).

A plurality (three in this embodiment) of brushes 21 to which the cable 12B is connected are attached to the lower half 16Y of the body. In this case, the cable 12B is an upper revolving unit. Electric wiring hole 17a opened in upper revolving unit frame 17 from electric motor 10 on the fourth side
And the lower half 1 of the body stored on the lower traveling body 2 side
It is led to a 6Y brush 21.

On the other hand, the inside body 15 is composed of a cylindrical body body 15X and a cylindrical outer body 15Y which is externally fitted and fixed to the outer periphery of the lower half of the body body 15X. And the inside body 15
The upper half of the body main body 15X is fitted on the inner peripheral side of the upper half 16X of the outside body, the outer body 15Y is fitted on the inner peripheral side of the lower half 16Y of the outside body, and the lower end of the outer body 15Y is further fitted. In a state supported by a flange portion 16b formed at a lower end portion of the lower half portion 16Y of the outside body, the outer body 16 is internally fitted to the outside body 16 so as to be rotatable around a turning axis and fixed. It is integrally fixed to the lower traveling frame 18 via the arm 22.

Further, the body 15X of the inside body 15 is provided with the upper half 16 of the outside body.
An annular groove 23 is cut at a portion corresponding to each hydraulic oil port 19 on the X side, and the annular groove 23 and the hydraulic oil port 19 constitute a hydraulic oil transmitting / receiving portion 13A between both bodies 15 and 16. Have been. Further, a hydraulic oil passage 24 extending from each annular groove 23 to the lower end surface of the body main body 15X is formed in the body main body 15X.
Pipes 25 connected to the left and right traveling motors are respectively connected to lower ends of the four.

The outer body 15Y is provided with an annular slip ring 26 which is in sliding contact with the brush 21 on the side of the lower half 16Y of the outside body.
An electric transmission / reception unit 13B between 16 is constituted. further,
An electric wiring path 27 is formed between the inner peripheral surface of the outer body 15Y and the outer peripheral surface of the body 15X. The wiring of the cable 12A extending from the cable winding device 14 is connected to each slip ring 26 through the electric wiring path 27.

In the construction as described above, the rotary joint 13 has an inside body 15 fixed to the lower traveling body 2 side, and is fitted to the inside body 15 so as to be rotatable around a turning axis, and is turned upward. And an outside body 16 fixed to the body 4 side, and power supply from a power supply source 11 installed outside the body to the electric motor 10 mounted on the upper swing body 4 is:
Via a cable 12A wound around the winding device 14 on the lower traveling body 2, a slip ring 26 attached to the inside body 15, a brush 21 attached to the outside body 16, and a cable 12A connected to the electric motor 10. The supply and discharge of hydraulic oil between the hydraulic pump 6 and the oil tank mounted on the upper revolving unit 4 and the left and right traveling motors provided on the lower traveling unit 2 are performed by the piping 20 on the upper revolving unit 4 side and the outside. This is performed via the hydraulic oil port 19 formed in the body 16, the annular groove 23 and the hydraulic oil path 24 formed in the inside body 15, and the piping 25 on the lower traveling body 2 side.

As described above, in the embodiment of the present invention, transmission and reception of hydraulic oil and electricity between the upper revolving unit 4 and the lower traveling unit 2 are performed via the rotary joint 13. An upper half of the rotary joint 13 is housed on the upper revolving unit 4 side, and a lower half thereof is the lower traveling unit 2.
The hydraulic oil port 19 and the annular groove 23, that is, the hydraulic oil sending and receiving portion 13 </ b> A between the outside body 16 and the inside body 15 are disposed on the upper half side, On the lower half side, a brush 21 and a slip ring 26, that is, an electric transmission / reception unit 13B between the two bodies 15, 14 are arranged.

As a result, the rotary joint 13 has an upper half on which the hydraulic oil transmitting / receiving section 13A is disposed on the upper revolving unit 4 side and a lower half on which the electric transmitting / receiving section 13B is disposed is disposed on the lower traveling body 2
The hydraulic oil piping and electrical wiring are placed in a narrow space on the upper revolving frame, such as the one where the entire conventional rotary joint is provided to protrude upward from the upper revolving frame. There is no need to concentrate, and piping, wiring work and maintenance work become easy, and workability is improved. Moreover, in this case, the lower half of the rotary joint 13 where the electric transmission / reception unit 13B is disposed is housed in the lower traveling body 2 side by effectively utilizing the dead space formed on the inner peripheral side of the slewing bearing 3. Therefore, it is not necessary to separately secure a space for the rotary joint 13 on the lower traveling body 2 side, which is convenient.

In this case, the lower half of the rotary joint 13 is formed with the electric wiring path 27 and the electric transmitting / receiving section 13B on the outer peripheral side of the hydraulic oil path 24, so that electric wiring can be easily performed. In this case, the cable 12B guided from the upper revolving unit 4 side to the lower traveling unit 2 side through the electric wiring hole 17a formed in the upper revolving unit frame 17 is a pipe for high-pressure hydraulic oil. Since it has a smaller diameter and greater flexibility than that of the cable 20, it is possible to lay the cable so as to crawl without any trouble even at a corner or the like.

Further, the inside body 15 has an outer body 15Y in which the electric wiring path 27 and the electric transmitting / receiving portion 13B are formed, externally fitted and fixed to the outer peripheral side of the body main body 15X in which the hydraulic oil path 24 is formed. Has been
The outer body 15Y has a structure in which the operating oil pressure does not work. As a result, the body 15X in which the operating oil pressure works is made smaller in diameter than the conventional one in which an electric wiring path is formed through the center in the axial direction. And the outer body 15Y can be made thin or made of a light material,
This contributes to the reduction in weight and size of the entire rotary joint 13.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a hydraulic excavator.

FIG. 2 is a sectional view of a rotary joint.

FIG. 3 is a cross-sectional view of a rotary joint showing a conventional example.

[Explanation of symbols]

 2 Lower traveling body 3 Upper revolving body 6 Hydraulic pump 10 Electric motor 11 Power supply source 13 Rotary joint 13A Hydraulic oil sending / receiving section 13B Electric sending / receiving section 15 Inside body 15X Body body 15Y Outside body 16 Outside body 16X Body upper half 16Y Body lower Half 19 Port for hydraulic oil 21 Brush 23 Ring groove 24 Path for hydraulic oil 26 Slip ring 27 Path for electric wiring

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshitaka Kubo 4-10-1, Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Co., Ltd. (72) Inventor Nobuaki Matoba 2-5-1 Marunouchi, Chiyoda-ku, Tokyo No. Mitsubishi Heavy Industries, Ltd. (72) Inventor Tadaharu Iida 2-25, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Takahashi Engineering Co., Ltd. (56) Reference: Jitsuhei 6-74658 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02F 9/00 E02F 9/12

Claims (4)

(57) [Claims] 1. An undercarriage for revolving an upper revolving structure to a lower traveling structure.
In construction machines that are pivotally supported via
An outside fixed to a lower traveling frame which is provided on a revolving shaft of the upper revolving superstructure and is fixed to the upper revolving superstructure frame for transmitting and receiving hydraulic oil and electricity between the lower traveling structure and the upper revolving superstructure. provided rotary joint constructed using the body and inside the body, the said rotary joint, when providing the hydraulic fluid transmitting and receiving part between the outside body and inside the body and the electrical transmitting and receiving part, b
Projecting joint upward from the upper pivot frame
Upper part of the rotary joint stored on the upper revolving unit side
Section and the lower part protruding downward from the upper revolving frame
The lower half of the rotary joint stored on the body frame side
In addition to structure, arranged it said hydraulic fluid transmission and reception unit in Russia over the elementary joint half side, the rotary joint structure in a construction machine electrical transmitting and receiving unit arranged to B over Tari joint lower half side. 2. The construction machine according to claim 1, wherein the lower half of the rotary joint has an electric wiring path and an electric transmitting / receiving section formed on an outer peripheral side of a hydraulic oil path connected to the operating oil transmitting / receiving section. Rotary joint structure. 3. The inside body according to claim 2, wherein the inside body is formed by externally fitting an outer body in which an electric wiring path and an electric transmitting / receiving portion are formed in a lower half portion on an outer peripheral side of a body main body in which a hydraulic oil path is formed. A rotary joint structure in a construction machine that is fixedly configured. 4. The construction machine according to claim 1, wherein the power supply source is connected to the lower traveling body side, and the electric power from the power supply source is connected to a hydraulic source mounted on the upper swing body by a rotary joint. A rotary joint structure in a construction machine that is a hydraulic shovel configured to be supplied via a hydraulic excavator.