JPS645183Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a disc-shaped stopper connected to the upper end of the inner cylinder to prevent the inner cylinder from descending relative to the outer cylinder, and a circumferential groove for forming an oil passage in the inner cylinder. The present invention relates to an improvement in a rotary joint for a swinging work vehicle, in which a large diameter part is separated from both sides to form a small diameter part for fitting an annular sealing material.

Conventionally, to configure the above rotary joint, as shown in FIG. 4, in the rotary joint inner cylinder 11, large diameter portions 18 are separated on both sides of the oil passage forming circumferential groove 13, and an annular sealing material 19 is provided. A thrust collar is provided between the lower surface of the outer periphery and the upper end surface of the outer tube 12 to form a small diameter portion 20 for fitting and to prevent the inner tube 11 from descending relative to the outer tube 12. 28 was installed in a state that was connected to the large diameter portion 18 located at the upper end of the inner cylinder 11, but a plurality of circumferential grooves 13 for forming oil passages were provided in the vertical direction of the inner cylinder 11, and the Since the disk-shaped stopper 14 is provided at the upper end of the rotary joint 10, the overall height of the rotary joint 10 becomes large.For example, the rotary joint protrudes from the control section, and the arrangement of various devices in the control section is restricted. Due to these space problems, there has been a strong desire to downsize the rotary joint, especially for small swing work vehicles.

In view of the above-mentioned conventional circumstances, the purpose of this invention is to achieve smooth rotation of the rotary joint while shortening the overall height of the rotary joint through rational and simple structural improvements, so that the rotary joint can rotate easily. The aim is to minimize interference with the arrangement of various devices on the table.

The characteristic configuration of the present invention is that in the above-mentioned rotary joint for a turning work vehicle, a small diameter portion for fitting an annular sealing material is formed at the upper end of the inner cylinder, and the annular sealing material is attached to the upper surface of the small diameter portion. The disk-shaped stopper is attached to restrict the upper side position, and the peripheral edge of the disk-shaped stopper is fitted into an annular groove formed between the outer cylinder and the upper cover thereof, so that the inner cylinder and the outer cylinder are connected to each other. The disc-shaped stopper has a structure for regulating the vertical relative position between the disc-shaped stopper and the disc-shaped stopper. The present invention has a structure in which a oil supply structure is formed to guide the oil between the upper end surface of the outer cylinder and the upper end surface of the outer cylinder, and this structure provides the following effects.

That is, a small diameter portion into which the annular sealing material is fitted is formed at the upper end of the inner cylinder, and a disk-shaped stopper is attached to the upper surface of the inner cylinder so as to regulate the position of the annular sealing material at the upper end of the small diameter portion. Therefore, it is possible to eliminate the conventional structure that causes the rotary joint to become larger, such as providing a large diameter part at the upper end of the inner cylinder to regulate the position of the annular sealing material, and the overall rotary joint It has now been possible to shorten the height of the

If a disc-shaped stopper is provided to restrict the position of the annular seal material on the upper end side of the small diameter part at the upper end of the inner cylinder as described above, the inner cylinder and outer cylinder may If a vertical positional shift occurs relative to the disk-shaped stopper, there is a risk that the annular seal will come off the upper end of the inner circumferential surface of the outer cylinder. is fitted into an annular groove formed between the outer cylinder and the upper cover thereof, thereby preventing relative vertical displacement between the inner cylinder and the outer cylinder.

In addition, although fitting the disc-shaped stopper into the annular groove as described above has the advantage of regulating the position described above, large frictional resistance is generated due to slight twisting of the inner and outer cylinders due to turning. This may hinder smooth rotation, but in the present invention, a portion of the drain oil is introduced between the disk-shaped stopper and the upper end surface of the outer cylinder for lubrication.
With the stopper used as a thrust collar, it has become possible to smoothly rotate the inner cylinder and the outer cylinder relative to each other.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, a swivel base 3 is attached to a vehicle body 2 equipped with a pair of left and right crawler traveling devices 1 so as to be fully swivelable, and a driving unit 4 and a driving unit 5 are provided on the swivel base. The arm 6 is mounted so as to be driven and swingable around the vertical axis, and the dozer work device 7 is also mounted on the traveling vehicle body 2 so as to be able to move up and down, so that excavation work and soil removal work can be performed alternatively. The work vehicle is configured as follows.

A pair of hydraulic motors M attached to each of the traveling devices 1 for driving them, a hydraulic cylinder C attached to the dozer working device 7 for driving up and down, and a hydraulic pump provided in the driving unit 4. P is connected to the vehicle body side piping 8 connected to the motor M and the cylinder C, respectively, and the pump P.
A rotary joint 1 is provided between the traveling vehicle body 2 and the swivel base 3 with the rotation axis X aligned with the rotation axis of the swivel base.
0, and this rotary joint 10 is constructed as shown in FIG.

That is, the inner cylinder 11 with the vehicle body side piping 8 connected in parallel in the circumferential direction to the outer circumferential surface of the lower end is mounted on the inner cylinder fixing frame 17 that is integrally connected to the vehicle body 2 frame.
A bottomed cylinder in which the inner cylinder 11 is connected with bolts in an upright state and with the upper part of the inner cylinder 11 protruding above the swivel base 3, and the swivel base side piping 9 is vertically connected in parallel to the outer peripheral surface. A shaped outer cylinder 12 is fitted onto the upper part of the inner cylinder 11 so as to be relatively rotatable, and a protrusion 12a formed approximately in the upper and lower center of the outer peripheral surface is connected to the support frame 15 of the swivel base 3. The fixing member 16 is fixed in the vertical groove 16a and is connected to the swivel base 3 so that it cannot rotate relative to the swivel base 3. By locating the fulcrum of the escape movement of the outer cylinder 12 against twisting at the mutual contact portion with the inner cylinder 11 at approximately the vertical center thereof, the twisting action is dispersed in the vertical direction of the rotary joint, and the extreme stress caused by the twisting action is dispersed. In addition, oil passages (not shown) are formed inside the inner and outer cylinders 11 and 12 for the vehicle body side piping 8 and the corresponding swivel table side piping 9, respectively. ), the circumferential groove 13 communicates with the inner and outer cylinders 1
Annular sealing materials 19 are arranged vertically in parallel at the contacting portions of No. 1 and 12 in correspondence with the respective pairs of piping, and in the inner cylinder 11, annular sealing materials 19 are provided on both sides of each circumferential groove 13 with a large diameter portion 18 in between.
A small diameter portion 20 for fitting is formed, and a third
As shown in the figure, the outer cylinder 11 of the inner cylinder 11 is fitted into an annular groove 21 formed between the upper end of the outer cylinder 12 and the outer cylinder cover 22 at the upper end of the inner cylinder 11 formed by the small diameter portion 20. A disk-shaped stopper 14 is bolted to the disk-shaped stopper 14 with its lower surface regulating the position of the annular sealing material 19 provided in the small diameter portion 20. By also providing a position regulating function, the large diameter portion 18 for regulating the position of the annular sealing material 19 located at the upper end of the inner cylinder 11 is omitted, and the overall height of the rotary joint 10 is shortened. .

Inside the inner cylinder 11, a drain passage 23 in the vertical direction is provided, and the lower end opening is located on the outer peripheral surface, and the upper end opening is connected to the upper end cover 22 of the outer cylinder 12 through the through hole of the disc-shaped stopper 14. A drain pipe 24 on the vehicle body side extending from both motors M is connected to the lower end opening, and a drain pipe 24 is provided in the driving section 4. Drain pipe 2 on the swivel base side extending from the hydraulic oil tank (not shown)
5 is connected to the upper end cover 22 of the outer cylinder 12 in a state communicating with the space S, and a plurality of oil holes 26 and an oil An oil supply structure consisting of an oil groove 27 that communicates with the circumferential side of the stopper 14 through a hole 26 is provided over the entire outer circumference of the stopper 14, and the inner and outer cylinders 11 and 12 that rotate relative to each other are provided.
Friction is reduced by the drain oil in the space S led to the oil groove 27, and the overall height of the rotary joint 10 can be shortened by having the lower surface of the disc-shaped stopper 14 also used as a thrust collar. It is structured as follows.

Next, another embodiment will be described.

In order to connect the outer cylinder 12 to the swivel base 3 in a relatively non-rotatable manner, the fixing member 16 formed with the locking portion 16a for the outer cylinder 12 may be directly attached to the swivel base 3. The specific structure connected to the swivel base 3 via the fixing member 16 at the upper and lower center portions can be modified in various ways.

The rotary joint according to the present invention is a type that not only connects the oil passage from the swivel base 3 to the vehicle body 2 side, but also has a rod that forms part of the mechanical interlocking mechanism inserted in the center hole of the inner cylinder 11. It can also be a vehicle for claim work, not limited to excavation work vehicles, etc.
Applicable to various turning work vehicles.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings illustrate an embodiment and a conventional example of the rotary joint for a swinging work vehicle according to the present invention, FIG. 1 is an overall side view of the work vehicle, FIG. 2 is a partial sectional view of the rotary joint, and FIG. 3 is a partial sectional view of the rotary joint. FIG. 4 is a partially sectional view showing a conventional rotary joint. 11... Inner cylinder, 12... Outer cylinder, 13... Circumferential groove,
14...Stopper, 18...Large diameter section, 19...
Annular sealing material, 20... Small diameter portion, 21... Annular groove, 22... Cover, 26, 27... Oil supply structure,
S...Drain space.

Claims (1)

[Scope of utility model registration request] A disk-shaped stopper 14 is provided at the upper end of the inner cylinder 11 to prevent the inner cylinder 11 from descending relative to the outer cylinder 12.In the inner cylinder 11, a large-diameter stopper 14 is provided on both sides of the circumferential groove 13 for forming an oil passage. Apart from section 18,
A rotary joint for a swing work vehicle in which a small diameter portion 20 for fitting an annular sealing material 19 is formed, the small diameter portion 20 for fitting an annular sealing material 19 in an upper end portion of the inner cylinder 11, Its small diameter portion 20
The disc-shaped stopper 14 is attached to the upper surface in a manner that restricts the upper position of the annular sealing material 19, and the peripheral edge of the disc-shaped stopper 14 is formed between the outer cylinder 12 and the upper cover 22 therefor. The disc-shaped stopper 14 has an outer cylinder upper cover 22 and a disc-shaped stopper 14 fitted into the annular groove 21 to regulate the vertical relative position between the inner cylinder 11 and the outer cylinder 12. A part of the drain oil in the drain space S formed between the disc-shaped stopper 1
4 and the upper end surface of an outer cylinder 12, the rotary joint for a swing work vehicle is characterized in that oil supply structures 26 and 27 are formed for guiding the oil between the upper end surface of the outer cylinder 12 and the upper end surface of the outer cylinder 12.