JPS61286694A - Rotary joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotor joint that is incorporated into a hydraulic circuit or the like and allows various fluids to flow between a fixed part conduit and a movable part conduit.

(Prior Art) FIGS. 7 and 8 show the structure of a conventional rotary joint, with FIG. 7 being an exploded perspective view and FIG. 8 being a perspective view.

In the figure, 1 is an outer cylinder, 2 is a distribution valve body slidably fitted in the outer cylinder so that it can rotate relatively, and 3 is a fluid passage on the outer cylinder side, which is formed in the circumferential direction at intervals on the inner surface of the outer cylinder. It consists of a plurality of annular communication grooves 4 and a connection port 5 bored in the outer cylinder 1 so as to communicate with each communication groove 4. Reference numeral 6 denotes a fluid passage on the valve body side, which has an opening 8 in the circumferential surface of the valve body, with the upper end of a plurality of communication holes 7 provided in the valve body parallel to the axis from the lower end facing each communication a4 of the outer cylinder 1. The opening at the lower end is the connection port 9, and the distribution valve body 2
is slidably fitted into the outer cylinder 1 so as to be rotatable, the outer cylinder side fluid passage 3 and the valve body side passage 6 communicate with each other on the sliding surfaces of both, regardless of the rotation of both, allowing fluid to circulate. Make it.

In addition, 10 in the figure is a mounting flange provided at one end of the valve body 2;
1 is a ball bearing interposed between the valve body at both the upper and lower ends of the outer cylinder 1; 12 is a holding member fixed to the valve element 2 at the upper end of the outer cylinder; and 13 is a mounting bracket provided on the outer cylinder 1.

In the above configuration, for example, the valve body 2 is used as a fixed part, and the outer cylinder 1
When the outer cylinder 1 is installed as a movable part in a hydraulic circuit that supplies hydraulic oil from a hydraulic supply source installed in a fixed part to various working mechanisms installed in a movable part to work, the outer cylinder 1 is approximately 360 degrees from the valve body 2. between a flexible pipe line 15 connected to the connection port 5 of the outer cylinder 1 via the halitosis 14 and a fixed pipe line 16 attached to each connection port 9 at the lower end of the valve body. It distributes and circulates hydraulic oil from a hydraulic supply source to the working mechanism.

(Problems to be Solved by the Invention) By the way, the structure of the conventional rotary joint described above is a combination of the outer cylinder and the valve body, which are the main components, both of which are integral. In addition to multiple annular communication grooves, the inner surface has been processed to create zero
The annular groove for inserting the ring had to be cut in multiple stages.
In addition, in the valve body, the required number of communication holes must be drilled from one end toward the valve body axis by deep hole machining.
The workability of both the outer cylinder and the valve body is extremely poor, making casting and machining of the parts difficult, and it takes time and effort to insert an O-ring between the two during assembly work.
It also has the disadvantage of poor assembly work efficiency and high manufacturing costs.

Furthermore, as mentioned above, since the outer cylinder and the distribution valve body are both integrated, the number of fluid passages formed inside the body is fixed, and when the number of fluid passages increases due to specification changes, it is necessary to change the number of fluid passages each time. The outer cylinder and valve body must be manufactured in accordance with the number of fluid passages, and it is also difficult to respond to diversification from a manufacturing standpoint.

This invention was made in consideration of the above points, and provides a highly versatile rotary joint that facilitates processing during manufacturing, reduces manufacturing costs, and improves responsiveness to diversification. The purpose is to

(Means for Solving the Problems) The gist of the present invention for solving the above object is that a distribution valve element is rotatably slidably fitted into an outer cylinder, and a connection port on the valve element side is connected to the outer cylinder. In a rotary joint that forms a plurality of fluid passages that allow fluid to flow by communicating between the outer cylinder side connection ports within the body regardless of their rotation, at least the valve body is connected to a plurality of main body segment pieces. The main body divided piece is provided with a plurality of through holes parallel to the axis at equal intervals on the same circumferential line, and one communication hole whose one end is open to the circumferential surface. One end of the piece is a connection port, and the other end is provided with a communicating hole that opens in correspondence with the number hole of the main body segment. A rotary joint characterized in that corresponding communication holes of the pieces are connected by a communication pipe inserted through a through hole of an intermediate divided piece to form a fluid passage on the valve body side.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a first embodiment of the rotary joint of the present invention, FIG. 2 is a sectional view of a divided piece of the main body of a distribution valve body, and FIG. 3 is a plan view thereof.

Note that parts common or equivalent to those in FIGS. 7 and 8 are given the same reference numerals.

In the figure, reference numeral 17 denotes a distribution valve body, and the valve body 7 is constituted by a combination of a plurality of body segment pieces 18 and a base piece 19. As shown in FIGS. 2 and 3, each main body segment 18 has a plurality of through holes 20 parallel to the axis at equal intervals on the same circumferential line, an upper end on the circumferential surface of the segment, and a lower end on the circumferential surface of the segment. One communication hole 21 opened on the lower surface of the divided piece is provided, and the base piece 19
has a communication hole 22 whose upper end is open on the upper surface of the divided piece corresponding to the hole of the main body divided piece 18, and whose lower end is opened on the circumferential surface of the divided piece.
are provided in the same number as the main body parts 18, and the peripheral openings thereof are used as connection ports 9 for connecting to an external conduit.

Therefore, in order to construct the valve body 17, each main body segment 18 is
The position of each communication hole 21 is shifted in the circumferential direction at least the angle between the center of the adjacent hole and the center of the valve body, and the lower end opening of the communication hole 21 of each main body segment 18 corresponds to the corresponding communication hole 22 of the base piece 19. The valve body side fluid passage 6 is formed by connecting both ends of a communication pipe 230 inserted into the through hole 20 of the intermediate main body segment 18 leading to the communication holes 21 and 22 to the upper end opening.

Then, the main body segment 18 and the base piece 1 that constitute the valve body 17
9, and in connecting both ends of the communication tube 23 within the main body divided pieces 18 and base piece 19,
The key joint surfaces are integrated by atmosphere brazing.

The above embodiment shows an inner hot water type, and a stepped portion 24 is provided on the outer periphery of the main body divided piece 18, and this stepped portion 24 is formed by connecting a plurality of main body divided pieces 18 to the communication hole 21 of each divided piece. A ring connection 84 is formed leading to.

Reference numeral 25 denotes an outer cylinder, and in the case of an inner groove type, this outer cylinder 25 may be an integral type, and the outer cylinder side fluid passage 3 provided inside the body is as follows:
It is only necessary to open the connection port 9 communicating with each annular communication m4 of the valve body 17 on the outer cylinder circumferential surface.

In the figure, 26 is an annular groove for inserting an O-ring formed on the outer periphery of the valve body together with the annular communication groove 4, and 27 is an O-ring.

FIG. 4 is a longitudinal cross-sectional view of a second embodiment of the rotary joint of the present invention, FIG. 5 is a cross-sectional view of a cut piece of the main body of the distribution valve body, and FIG. 6 is a cross-sectional view of a divided piece of the outer cylinder.

This embodiment shows an external structure type, and in this embodiment, the annular communication groove i4 provided on the circumferential surface of the valve body 17 in the first embodiment is formed inside the outer cylinder 25, and this annular communication groove 4 is It is incorporated into a part of the cylinder side fluid passage 3.

Therefore, in this second embodiment, the outer cylinder 25 is also constructed by combining the outer cylinder divided pieces 28 which are divided corresponding to the respective main body divided pieces 18 constituting the valve body 17, and the inner circumference of the outer cylinder divided pieces 28 is An annular groove 26 for inserting an O-ring is formed on the surface together with an annular communication groove 4, and a connection port 5 is formed on the outer cylinder circumferential surface to communicate with the annular communication groove 4.
is opened.

Incidentally, in the case of the outer cylinder divided pieces 28 as well, when connecting the outer cylinder divided pieces 28 to each other, key connecting surfaces are integrated by atmospheric brazing in the same manner as the valve body.

(Function) In the above configuration, the use of the rotary joint of the present invention is similar to that of the conventional rotary joint.

For example, when the distribution valve body 17 is a fixed part and the outer cylinder 25 is a movable part, it is incorporated into a hydraulic circuit that supplies hydraulic oil from a hydraulic supply source installed in the fixed part to various working mechanisms installed in the movable part. , the outer cylinder 25 is approximately 360 degrees relative to the valve body 17.
The hydraulic oil from the hydraulic supply source is distributed and distributed to the working mechanism between the connection port 9 of the valve body 17 and the connection port 5 of the outer cylinder 25 by allowing rotation within a range of degrees.

(Effects) This invention has the following effects by being configured as described above.

(1) The main body parts that make up the valve body are of the same shape, with a plurality of through holes parallel to the axis at equal intervals on the same circumferential line, and one communicating hole with one end opening on the circumferential surface. Since we decided to use multiple parts, machining of these divided pieces does not require deep hole machining unlike machining conventional integrated valve bodies, and machining is easy and mass production is possible. However, the number of fluid passages is not fixed, and specifications can be quickly met by combining the required number of main body segment pieces according to specifications, making it highly adaptable to a wide variety of products.

(2) In the case of the inner groove type as in the first embodiment, the stepped portion provided on the outer periphery of each main body segment to which the valve body is combined forms an annular shape that communicates with each communication hole by the combination of the main body segment. Since a communication groove is formed and an annular groove for inserting an O-ring is cut on the outer periphery of the main body segment, machining of the inner surface of the outer cylinder that is combined with this valve body is easy, and it is easier to process than the conventional one. In addition to multiple annular communication grooves like an integrated outer cylinder, there is a zero gap between each communication groove.
There is no need for multi-stage machining to cut an annular groove for inserting a ring in multiple stages, and even if it is an integral type, the outer cylinder can be manufactured easily.

(3) In the case of the outer groove type as in the second embodiment, the outer cylinder is also composed of a combination of divided pieces corresponding to each of the main body parts constituting the valve body, so that the valve body can be adjusted according to the number of fluid passages. Since the required number of divided pieces of the body and outer cylinder can be combined, it does not become unnecessarily large and is convenient to handle.Also, it is possible to form an annular communication groove on the inner peripheral surface of each outer cylinder divided piece. However, forming the annular communication groove does not require multi-stage annular groove machining unlike the inner surface machining of a conventional integral type outer cylinder, and the manufacturing process of the outer cylinder is also simplified here.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a first embodiment of the rotary joint of the present invention, FIG. FIG. 5 is a cross-sectional view of the main body portion of the distribution valve body, FIG. 6 is a cross-sectional view of the outer cylinder portion,
FIG. 7 is an exploded perspective view showing a conventional rotary joint, and FIG. 8 is a perspective view thereof. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Distribution valve body, 3... Outer cylinder side fluid passage, 4... Annular communication groove, 5... Connection port, 6...
Valve body side fluid passage, 7... communication hole, 8... upper end opening,
9...Connection port, 10...Mounting flange, 11...
Ball bearing, 12... Holding metal fitting, 13... Mounting metal fitting, 1
4... Bad breath, 15... Flexible pipe line, 16... Fixed pipe line, 17... Distribution valve body, 18... Main body partial piece, 1
9... Base piece, 20... Through hole, 21... Communication hole, 22... Communication hole, 23... Communication pipe, 24... Step part, 25... Outer cylinder, 26 ... Annular groove for O-ring insertion, 27 ... O-ring, 28 ... Outer cylinder division piece. Item 7

Claims (3)

[Claims] (1) A distribution valve body is slidably fitted into the outer cylinder so as to be rotatable, and the connection port on the outer cylinder side and the connection port on the valve body side are communicated within the body regardless of their rotation, allowing fluid to flow. In a rotary joint having a plurality of fluid passages, at least the valve body is constituted by a combination of a plurality of main body segment pieces and a base piece, and the main body segment pieces have axes arranged at equal intervals on the same circumferential line. A plurality of through-holes parallel to each other and one communication hole with one end opening on the circumferential surface are provided, one end is a connection port in the base piece, and the other end is a communication hole that opens corresponding to each hole in the main body segment. Make a hole,
The communication holes of each main body segment were shifted from each other, and the communication holes and the corresponding communication holes of the base piece were connected by a communication pipe inserted into the through hole of the intermediate segment to form a fluid passage on the valve body side. A rotary joint characterized by: (2) On the outer periphery of each main body segment to which the valve body is connected,
2. The rotary joint according to claim 1, further comprising an annular communication groove communicating with the communication hole of each divided piece. (3) The above-mentioned outer cylinder is constituted by an assembly of divided pieces that are divided corresponding to the respective main body parts constituting the valve body, and the inner peripheral surface of this outer cylinder divided piece communicates with each communication hole of the valve body. 2. The rotary joint according to claim 1, further comprising an annular communication groove formed therein.