JPS6332228B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary joint device.

Generally, in swinging work vehicles such as hydraulic power shovels, hydraulic cranes, and earth augers, swinging is used to communicate and transmit hydraulic fluid and electricity between the rotating body mounted on the machine frame and the machine frame. A rotary joint device is used at the site.

By the way, the conventional rotary joint device has an extremely large vertical height dimension and largely protrudes upward from the upper surface of the revolving structure, which is extremely obstructive when installing a hydraulic working device or a seat to the revolving structure.

The present invention solves these conventional problems, reduces the overall height, can be installed compactly in a rotating part, is easy to disassemble, maintain and inspect, and is not only capable of distributing oil and electricity. The purpose is to enable the transmission of mechanical operations. Therefore, a feature of the present invention is that, in a rotating joint device installed in a swinging work vehicle equipped with a hydraulic work device on a swinging body mounted on a body frame, an axis that coincides with the center of rotation of the swinging body is An oil distribution outer cylinder and an oil distribution inner cylinder having a core are fitted to each other so as to be slidable and rotatable, and oil passages formed in each of the oil distribution outer cylinder and the oil distribution inner cylinder are made to correspond to each other in a communicating manner, and , the axis of the current collector consisting of a power distribution outer cylinder equipped with a current collection brush and a power distribution inner cylinder equipped with a slip ring is aligned with the rotation center, and the current collector is arranged above from the oil distribution inner cylinder. The mechanical operation transmission member is disposed in a suspended manner inside the oil distribution inner cylinder with a suspension member so as to be able to be pulled out, and the mechanical operation transmission member is inserted into the power distribution inner cylinder in a penetrating manner. It is located at the point located at the center of the above-mentioned turning.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows a swing work vehicle equipped with a hydraulic work device 3 on a swing body 2 mounted on a body frame 1.
Specifically, a hydraulic power shovel is exemplified. The revolving body 2 rotates 360 degrees around the vertical rotation center A.
It is mounted on the fuselage frame 1 using a large annular bearing (not shown) so as to be able to rotate. A hydraulic drive source and a power source are provided on the body frame 1 side, and a rotary joint device 4 illustrated in FIG. and is configured to distribute oil and power to electrical equipment.

This hydraulic equipment includes a hydraulic motor for swinging, a luffing cylinder 5, and first and second bending cylinders 6 and 7. Electrical equipment includes various load detectors, angle detectors, work lights, buzzers, and solenoids. There are solenoid parts of valves, etc. Of course, Figure 1 is just an example of a swing work vehicle, and other swing work vehicles such as hydraulic cranes, earth augers, and aerial work vehicles may have different hydraulic equipment and electrical equipment depending on their functions. is provided.

An example of the rotary joint device 4 is specifically shown in FIGS. 2 to 6. As is clear from the figure, the shaft oil supply device 8 is disposed on the outside and the current collector 9 is disposed inside the shaft oil supply device 8.
It has an oil distribution outer cylinder 10 and an oil distribution inner cylinder 11 having an axis that coincides with the rotation center A of the revolving structure 2, and the outer cylinder 10
The inner circumferential surface 10a of the inner cylinder 11 and the outer circumferential surface 11a of the inner cylinder 11 are slidably and rotatably fitted into each other.

The inner cylinder 11 has an outer flange 12 near the upper end, and an annular plate 13 is detachably attached to the lower end surface with bolts 14 or the like, and the outer flange 13a and the inner flange 13b are connected with the annular plate 13. Eggplant. The inner cylinder 11 has its outer peripheral surface 11a
, annular oil passages 15 and seal grooves 16 are recessed alternately upward and downward, and further oil passages 17 in the axial direction are formed.
are drilled from above at various depths, and the axial oil passage 17 and the annular oil passage 15 are in principle one-to-one.
Correspondingly, they are communicated through a radial oil passage 18. Also,
A radial oil passage 19 is bored above the outer flange 12 and connected to each axial oil passage 17, and the outer peripheral end of the radial oil passage 19 is used as a port. One end of piping, such as a pipe or a hose, that is communicatively connected to the above-mentioned hydraulic equipment on the revolving body 2 side is connected.
In addition, a sealing material 20 such as an O-ring is provided in the sealing groove 16.
is fitted.

Then, if the outer cylinder 10 is fitted onto the inner cylinder 11 without the annular plate 13, and then the annular plate 13 is fixed with bolts 14, etc., the inner cylinder 11 and the outer cylinder 10 will not be aligned in the axial direction. They are fitted in such a way that they do not move relative to each other and are only rotatable. Further, reference numeral 2a denotes a mounting hole opened in the rotating part of the rotating body 2, and the fitted inner and outer cylinders 11 and 10 are inserted into the mounting hole 2a from above, and the outer flange 12 is fixed with bolts 21, etc. It will stick.

On the other hand, the oil distribution outer cylinder 10 has an oil passage 2 which also serves as a port.
2... are installed in the radial direction in multiple stages up and down, and as shown in FIG.
correspond to the letter of communication. Here, the oil passage 15 sequentially communicates with the oil passages 18, 17, and 19, and communicates with the port at the upper end of the inner cylinder 11.
Each port at the upper end of is communicatively connected to each port-cum-oil passage 22 of the outer cylinder 10.

Pipes 22, 23, such as pipes and hoses, which are connected to hydraulic equipment such as a hydraulic pump and an oil reservoir on the body frame 1 side are connected to the oil passage 22, as partially shown in FIG.

Next, the current collector 9 will be explained. The current collector 9 includes a power distribution outer cylinder 25 equipped with current collecting brushes 24 as shown in FIGS. 3 and 5, and a slip ring 2.
It consists of a power distribution inner cylindrical body 28 in which 6... are stacked vertically and integrated with an insulating ring 27 interposed therebetween.

Specifically, the power distribution outer cylinder 25 has an inner flange 2 at its lower end.
9, and rotatably supports the vicinity of the lower end of the power distribution inner cylindrical body 28 via a bearing 30. Reference numeral 31 denotes a suspension member for holding the current collector 9 in a suspended manner inside the oil distribution inner cylinder 11 of the shaft oil supply device 8, and 31 is a suspension member for holding the current collector 9 in a suspended manner inside the oil distribution inner cylinder 11 of the shaft oil supply device 8. It can be extracted to
As is clear from FIG. 2, the axis of the current collector 9 is aligned with the pivot center A.

The suspension member 31 is a cylindrical body with an upper opening, and has an outer flange 32 at the upper end, and the outer flange 32 is brought into contact with the upper end surface of the oil distribution inner cylinder 11 as shown in FIG.
It is removably fixed with bolts 33, etc. In addition, the power distribution outer cylinder 2 is attached to the bottom plate part 34 of the cylindrical suspension member 31.
5, abut the upper outer flange 35 from below, and tighten the bolt 36
It is attached removably. And the bottom plate part 3
A hole is provided through the hole 4, and the upper part of the power distribution inner cylindrical body 28 is relatively rotatably supported in the hole through a bearing 37.

A hanging portion 38 with an irregular cross section is arranged below the pivot portion of the bearing 30 at the lower end of the power distribution inner cylinder 28, and a rotation stopper bar 40 is fixed to the lower end of the oil distribution outer cylinder 10 with bolts 39 or the like. The hanging portion 38 is inserted into the elongated hole 40a from above to prevent rotation of the power distribution inner cylinder 28, thereby always preventing relative rotation between the oil distribution outer cylinder 10 and the power distribution inner cylinder 28. are doing. In addition,
Reference numeral 41 denotes a rotation prevention mechanism that prevents relative rotation of the oil distribution outer cylinder 10 with respect to the fuselage frame 1. For example, a locking piece 42 having a recess is provided protrudingly on the side of the fuselage frame 1, and on the other hand, the oil distribution outer cylinder 10 is A locking protrusion 43 is provided protrudingly on the outer peripheral surface of the locking protrusion 43, and when the oil distribution cylinders 11 and 10 are integrally assembled and inserted from the mounting hole 2a, the locking protrusion 43 is attached to the locking piece 42. Engaging with the recessed portion,
It acts as a rotation stopper.

44 is a mechanical operation transmission member such as a push-pull wire that mechanically interlocks and connects the accelerator pedal on the revolving body 2 and the accelerator of the engine on the fuselage frame 1 side. The power distribution inner cylindrical body 28 has a through hole 45 along its axis,
A square pipe body 46 is fixed to the upper end of the mechanical operation transmission member 44, and the mechanical operation transmission member 44 is inserted into the through hole 45 of the power distribution inner cylinder body 28 and the inside of the square pipe body 46, so that the mechanical operation transmission member 44 is connected to the turning center A. will be placed.

Specifically, a bell crank 47 is pivotally attached to the inside of the upper end of the hanging member 31 with a pin 48, and the transmission member 44 is attached with a pin 49 at one end of the bell crank 47.
A rod 50 pivotally attached to the rod 50, a twist prevention device 51 attached to the lower end of the rod 50, a square rod 52 connected below the rod 50, and a flexible bush pull connected to the square rod 52. It is composed of wires 53 and the like.

As shown in FIG. 4, the twist prevention device 51 consists of a bearing retainer 54, a bearing 55, and a bearing stopper 56, and the rotating body 2, suspension member 31, bell crank 47, and rod 50 rotate around the rotation center A. When this is done, the square rod 52 and the push-pull wire 53 do not rotate, and the operation in the axial direction E is reliably transmitted. The square rod 52 is made of square pipe material 4.
6 from above to prevent relative rotation. Further, as shown in FIG. 2, another mechanical operation transmission member 57 such as a push-pull wire is connected to the other end of the bell crank 47.

The present invention has effectively achieved its intended purpose with the configuration detailed above. In particular, since it is possible to transmit not only oil distribution and power distribution but also mechanical operation, it is possible to reliably transmit the accelerator pedal pressure of the operator on the revolving structure to the accelerator of the engine on the fuselage frame side. Moreover, by having the current collector inside the oil distribution cylinder and the mechanical operation transmission member inserted therein, the overall height of the rotary joint device can be significantly reduced and compactness can be achieved. Therefore, it has become possible to attach operating levers and various devices with sufficient margin near the rotating part on the rotating body side.
Furthermore, the current collector can be removed upward from the oil distribution inner cylinder, making maintenance and inspection extremely easy. Also, since the current collector can be pulled out upwards independently of the oil supply device,
Pipes, hoses, and other piping do not get in the way at all, making maintenance and inspection easier.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing one embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the main parts, FIG. 3 is a sectional view of the main parts showing the assembled state of the current collector 9, the suspension member 31, and the mechanical operation transmission member 44, and FIG. 4 is the transmission member 44.
5 is an enlarged sectional view taken along line BB in FIG. 3, and FIG. 6 is a plan view of FIG. 3. A... Swing center, 1... Airframe frame, 2... Swivel body, 3... Hydraulic working device, 9... Current collector, 10...
Oil distribution outer cylinder, 11... Oil distribution inner cylinder, 15, 22... Oil path,
24... Current collection brush, 25... Power distribution outer cylinder, 26... Slip ring, 28... Power distribution inner cylinder, 31... Hanging member, 44... Mechanical operation transmission member.

Claims (1)

[Claims] 1. In a rotating joint device installed in a swinging work vehicle equipped with a hydraulic working device 3 on a rotating body 2 mounted on a body frame 1, an arrangement having an axis that coincides with the rotation center A of the rotating body 2 is used. The oil outer cylinder 10 and the oil distribution inner cylinder 11 are slidably and rotatably fitted into each other, and the oil passages 22, 15 formed in the oil distribution outer cylinder 10 and the oil distribution inner cylinder 11 are connected to each other. Furthermore, the axis of the current collector 9 consisting of the power distribution outer cylinder 25 equipped with the current collection brushes 24 and the power distribution inner cylinder 28 equipped with the slip rings 26 is aligned with the rotation center A, and The current collector 9 is suspended inside the oil distribution inner cylinder 11 by a suspension member 31 so that it can be pulled out upward from the oil distribution inner cylinder 11, and 28. A rotary joint device characterized in that a mechanical operation transmission member 44 is inserted in a penetrating shape, and the mechanical operation transmission member 44 is disposed at the pivot center A.