JP2546594Y2 - Rotary joint assembly of work vehicle with swivel table - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a work vehicle having a revolving base mounted on a traveling body so as to be able to revolve horizontally, which is disposed coaxially with the revolving center of the revolving base, and is provided between the traveling body and the revolving base. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary joint assembly that forms a fluid passage, and more particularly to a rotary joint assembly in which a first rotary joint and a second rotary joint are vertically arranged to form a plurality of fluid passages. This type of rotary joint assembly is used for a mobile crane or an aerial work vehicle.

[0002]

2. Description of the Related Art A conventional example of a rotary joint assembly of this type will be described with reference to FIG. In FIG. 2, 1
Reference numeral 2 denotes a traveling body, and 2 denotes a swivel table mounted on the traveling body 1 so as to be horizontally pivotable. Reference numeral 3 denotes a first rotary joint which is arranged coaxially with the turning center 2 a of the turning table 2 and forms a plurality of fluid passages between the traveling body 1 and the turning table 2. This second
The rotary joint 3 includes an inner member 4 connected to the swivel base 2 and having a hollow hole 4a, and an outer member 5 connected to the traveling body 1 and slidably fitted to the inner member 4. Hydraulic oil is supplied and discharged between the traveling body 1 and the swivel base 2 through a plurality of fluid passages (not shown) passing through a sliding rotating portion between the inner member 4 and the outer member 5. 6,
6 are pipes for connecting the inner member 4 of the first rotary joint 3 and a hydraulic device (not shown) on the swivel 2. Reference numerals 7, 7... Are pipes for connecting the outer member 5 of the first rotary joint 3 and a hydraulic device (not shown) on the traveling body 1.

Reference numeral 8 denotes a second rotary joint which is disposed coaxially with the turning center 2a of the turning table 2 below the first rotary joint 3 and forms a fluid passage between the traveling body 1 and the turning table 2. is there. The second rotary joint 8 is composed of an outer member 9 and an inner member 10 which are slidably and rotatably fitted to each other. 1 is connected to the lower end of the inner member 4 of the rotary joint 3 and the other member (inner member) 10 is connected to the first rotary joint 3.
The fluid is supplied and discharged between the traveling body 1 and the swivel 2 via a fluid passage passing through a sliding rotation part between the two members 9 and 10. Things. Reference numeral 11 denotes a pipe for connecting the second rotary joint 8 (outer member 9) to a fluid device (not shown) on the swivel 2; one end of the pipe 11 The rotary joint 3 is constituted by a flexible hose that is led upward through a hollow hole 4a of an inner member 4 of the rotary joint 3. Reference numeral 12 denotes a pipe arranged on the second rotary joint 8 (the inner member 10) and the traveling body 1.

The thus constructed rotary joint assembly has the effect that the fluid passage between the traveling body 1 and the swivel base 2 can be increased by the second rotary joint 8 disposed below the first rotary joint 3. I have.

[0005]

However, in the conventional rotary joint assembly constructed as described above, the flexible hose 11 connecting the second rotary joint 8 and the hydraulic equipment on the swivel base 2 is not provided. However, there is a problem in that the work machine swings and damages inside the hollow hole 4a of the inner member 4 of the first rotary joint 3 due to the vibration of the work machine. Further, there is a problem that the hose 11 from the hollow hole 4a greatly protrudes upward from the first rotary joint 3, and as a result, the height dimension of the rotary joint assembly becomes large. The purpose of the present invention is to provide a rotary joint assembly that solves the above-mentioned problems of the prior art.

[0006]

In order to achieve the above object, the rotary joint assembly of the working vehicle having the swivel base according to the present invention is an inner member of the first rotary joint 3 of the conventional rotary joint assembly described above. 4
Is screwed to the upper end of the inner member 4 so as to cover the hollow hole 4a of the inner member 4, and the hose holding metal is used to regulate the direction in which the hose is led out.

[0007]

The rotary joint assembly of the working vehicle having the turntable of the present invention configured as described above has a hollow hole 4a of a flexible hose 11 for connecting the second rotary joint 8 and the hydraulic equipment on the turntable 2. The lead-out portion of the hose 11 is held down by the hose holding member 13, so that the swinging of the hose 11 in the hollow hole 4a is restricted, and the direction of the hose 11 coming out of the hollow hole 4a is forced by the hose holding member. Therefore, the amount of hose 11 protruding above the first rotary joint 3 can be reduced, and the height of the rotary joint assembly can be reduced accordingly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary joint assembly of a working vehicle having a swivel according to the present invention will be described below with reference to FIG. Since the rotary joint assembly of the present invention is configured by adding a hose retainer to the above-described conventional rotary joint assembly, reference numerals used in describing the conventional rotary joint assembly are as follows. They are used as synonyms.

In FIG. 1, reference numeral 13 denotes an inner member 4 at the upper end of the inner member 4 of the first rotary joint 3.
Is a hose holding fitting arranged to cover the hollow hole 4a. The hose retainer 13 is detachably attached to the inner member 4 with screws 14, 14. The lead-out portion of the hose 11 from the hollow hole 4a is pressed by the hose holding member 13 to restrict swinging, and the lead-out direction of the hose 11 from the hollow hole 4a is forcibly guided in the lateral direction. Eleventh rotary joint 3
The upward protrusion is small.

The hose holding fitting 13 of this embodiment is
Is provided with a cylindrical vertical wall 13a extending downward on the outer periphery thereof, and a cutout 13b for allowing the hose 11 to pass is provided at an appropriate position on the vertical wall 13a. Further, in the above embodiment, the second rotary joint 8 has been described as forming a single fluid passage. However, it is a matter of course that a plurality of fluid passages may be formed. In this case, a plurality of hoses 11 are drawn out from the hollow holes 4a of the inner member 4 of the first rotary joint 3. In this case, when the notch 13b is provided in the hose holding member 13 as in the above embodiment, the notch 13b may be provided for each hose 11.

[0011]

The rotary joint assembly of the working vehicle having the swivel table according to the present invention configured as described above has a simple configuration in which a hose holding fitting is simply added to the conventional rotary joint assembly. The practical effect is great because the body's shortcomings have been resolved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a rotary joint assembly of a working machine having a swivel table according to the present invention.

FIG. 2 is an explanatory view of a rotary joint assembly of a working machine having a conventional swivel base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving base 3 1st rotary joint 4 Inner member 4a Hollow hole 5 Outer member 6 Piping 7 Piping 8 Second rotary joint 9 Outer member 10 Inner member 11 Hose 12 Piping 13 Hose press fitting

Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location E02F 9/00 E02F 9/00 B

Claims (1)

(57) [Scope of request for utility model registration] 1. A work vehicle having a swivel mounted on a traveling body so as to be capable of horizontally swiveling, a rotary arranged coaxially with a center of rotation of the swivel and forming a fluid passage between the traveling body and the swivel. A joint assembly comprising: an inner member connected to a swivel side and having a hollow hole; and an outer member connected to a traveling body and slidably fitted to the inner member. A first rotary joint for supplying and discharging hydraulic oil between the traveling body and the swivel table via a hydraulic oil passage passing through a sliding rotating portion between the members, and an inner and outer member which are slidably and rotatably fitted to each other. An upper end of one member is connected to a lower end of an inner member of the first hydraulic rotary joint, and the other member is connected to an outer member of the first hydraulic rotary joint or a proper position of a traveling body, and the first hydraulic Rotary joy Disposed on the lower side of the bets, the second rotary for supplying and discharging fluid between the swivel base and said traveling body through a fluid passage which passed the sliding rotation portion between both members
Consists of a joint, the fluid connection between the swivel base side and the second rotary joint,
One end of the second rotary joint is connected to one end of the second rotary joint, and the first rotary joint is connected via a flexible hose that extends upward through a hollow hole of the inner member. A rotary table is provided, wherein a hose retainer for covering a hollow hole of the inner member is screwed to an upper end portion of the inner member of the rotary joint, and the hose retainer is used to regulate a direction in which the hose is led out. Rotary joint assembly for work vehicles.