JP2003148668A - Universal rotary joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a universal rotary joint equipped with a nipple to make head swing motions relative to a sleeve at a specified angle. SOLUTION: The sleeve and nipple are coupled together by a two-split joint, and a pivoting ring is formed on one of the sections generated by splitting, while a shaft is formed on the other so that a gliding part is formed, and the coupling shaft of the gliding part is inclined at a certain angle to the longitudinal axis of the sleeve, and thereby a wide-angle swinging is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid joint for detachably connecting a tool and a hose for connecting a fluid compressor and a tool for supplying a compressed fluid to a portable fluid tool or the like, and more particularly to a tool. The present invention relates to a universal rotary joint in which the connecting direction of a hose is freely rotatable.

[0002]

2. Description of the Related Art As a universal rotary joint, Japanese Patent Publication No. 7-6
No. 2513 and JP-A-6-109176 are known. In these conventional techniques, the front arc of a spherical arc formed at the rear end of the nipple in order to allow the nipple portion to swing in the radial direction relative to the sleeve body is placed in the concave arc formed at the opening end of the nipple side joint. This is done by loosely fitting the ball and holding the rear arc with a plurality of balls.

Further, an intermediate body having spherical arcs formed at both ends is interposed between the sleeve and the nipple, and the spherical arcs at both ends are loosely fitted in the concave arcs formed at the ends of the sleeve and the nipple, respectively, to freely rotate. It is known that by holding it so that it can freely rotate in a wider angle. Further, in this structure, a bellows-like cover for covering the rotating portion is attached in order to prevent dust and the like from entering the rotating portion and hindering the rotation.

[0004]

In the conventional rotary joint, it is necessary to form a spherical arc and a concave arc in the connecting portion, and there is a problem that a high technology is required for forming this and the manufacturing cost is increased. .

Since it is necessary to form a spherical arc and a concave arc at each end, when the diameter of the flow path of the fluid is increased, the shape of the sphere inevitably becomes large, and as a result, the surface of the fluid having a large pressure acts. As a result, the resistance to rotation increases, which hinders free bending.

Further, in the joint in which the spherical arc and the concave arc are combined and connected, both can freely swing, so that when the socket attached to the end of the hose is attached to the nipple, a pressing force acts on the nipple. Then, the nipple part is inadvertently tilted, which makes it difficult to mount the socket.

Further, there is a phenomenon that the bellows-like cover is damaged or detached from the mounting portion, and dust and the like enter the rotating portion, which makes it difficult to rotate freely. Japanese Patent Laid-Open No. 4-2
In the case of the rotary joint disclosed in Japanese Patent No. 36884, a plurality of steel balls are used to hold the spherical arc portion within the concave arc, but the tip of the screw that closes the opening for inserting the steel ball. However, since the steel ball cannot revolve around the premises, resistance to movement in the rotational direction between the two members occurs. As a result, it is relatively difficult to twist the hose and the like.

The present invention is intended to provide a universal rotary joint which can be manufactured at low cost without requiring a spherical arc and a concave arc which increase the manufacturing cost. Further, it is an object of the present invention to provide a universal joint that allows easy mounting of the socket without inadvertently tilting the nipple when mounting the socket attached to the end of the hose.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a sleeve-side joint and a nipple-side joint are divided into two parts, and an intermediate member is arranged between the two members to form rotating planes inclined with respect to each other. By connecting them together, both members can freely rotate.

According to the present invention, a joint is composed of a hollow sleeve body or plug body, a nipple body, and a hollow intermediate body arranged between the hollow body and the nipple body, and between the intermediate body and the sleeve body or the plug body and the nipple body. , Forming fluid joints that can be rotated by bathing in planes inclined at mutually different angles with respect to the axial direction, and forming one rotation surface on a surface orthogonal to the extension direction of the axis line, Further, the rotary joint portion is composed of a cylindrical concave portion and a cylindrical portion rotatably accommodated in the concave portion, and is formed on the outer periphery of the annular groove (groove) formed in the cylindrical concave portion and the cylindrical portion. The problem is solved by rotatably holding a plurality of balls accommodated in the annular groove, for example, steel balls.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention functions as a fluid joint and also as a quick joint. A nipple body constituting one of the rotary joint portions is attached to one end on the sleeve body side, and one end of the nipple body is attached to the sleeve body side. A nipple is formed to connect a hose for fluid supply.

The intermediate body is connected at one end side to the other end of the nipple body via a rotary joint so as to be rotatable about the axis, and the intermediate body and the other end piece and the other end side of the sleeve body are connected. Each of the outer shapes is formed in a hemispherical shape, and an inclined plane of rotation is formed by a surface that passes through substantially the center of the sphere and that is inclined with respect to the axis of the sleeve body.

The rotary joint portion has a cylindrical concave portion formed on the side of the member forming one of the opposite planes of the rotation plane, which is perpendicular to the plane, and a member forming the other plane. And a cylindrical portion rotatably housed in the cylindrical concave portion.

A fluid passage communicating with the hollow portion is formed at the bottom of the recess and at the center of the cylindrical portion, and the fluid passage is provided between the outer periphery of the cylindrical portion and the peripheral wall of the cylindrical recess (0).
It is kept sealed by a ring).

Further, it is rotatably held by an annular groove formed in the cylindrical recess outside the annular seal member and a plurality of steel balls housed in an annular structure formed on the outer periphery of the cylindrical portion. Steel balls are inserted into the premises through holes that are opened in the radial direction, and the holes are closed by a set screw. Do not let the tip of the set screw protrude into the premises,
The steel balls are retained on the premises so that they can rotate and revolve, and the rotation of both members is maintained well.

By forming two surface rotations having different angles from each other through the intermediate body between the sleeve body and the nipple body, the sleeve body and the nipple body are relatively three-dimensionally formed. It creates freedom in any direction.

The rotating surface of one of the two rotating parts is constituted by a surface orthogonal to the axis of the nipple body, and the pressing force at the time of mounting the socket on the nipple body is received by the orthogonal plane so that the socket can rotate in the direction of rotation. It has a structure that does not generate acting force. [Embodiment 1] The embodiment of the present invention will be described below with reference to FIGS.

The universal joint according to the present invention comprises a sleeve body 1 forming a sleeve side joint, a nipple body 2 forming a nipple side joint, and a joint body 3, and as shown in the drawing, the sleeve 1 and the nipple body. 2 is connected to both ends of the joint body 3 as an intermediate body. Reference numeral 6 is a fluid passage.

The sleeve body 1 is provided with a locking ball 11 for fixing a plug member (not shown), an operation ring 12 and a spring 13 for restricting the advance / retreat of this ball, and a spring 15 is provided in the sleeve body. A valve 14 for closing the fluid passage 6 is provided and functions as a quick coupling. 16 is a packing material.

Further, the sleeve body 1 and the divided portion 4 of the joint body 3 are connected and fixed by screwing 17.

A nut 21 and a screw 22 are formed on the nipple body 2 as a connecting portion with a hose or the like, and a shaft 51 of another split portion 5 of the joint body 3 is attached to a pivot ring 23 and a snap ring 52.
The rotating portion 20 is formed so that both members are L-shaped in a slidable manner via. Reference numeral 53 is a sealing material.

The joint body 3 as an intermediate body has two divided portions 4
2 and 5, both split parts 45 are slidably connected to each other so as to rotate the surface while being inclined at an angle θ with respect to the longitudinal axis on the sleeve side. Has been formed.

The rotary joint portion 30 has a pivotal ring 31 formed as a cylindrical concave portion formed in the divided portion 4 and a shaft 3 formed as a cylindrical portion accommodated in the concave portion formed in another divided portion 5.
It is carried out by filling a plurality of balls (steel balls) 33 into the respective groove lines 34 and 35 formed on the surface facing the groove 2. Further, the ball 33 is thrown in through the ball throwing hole 37, and after throwing in, the set screw 36 prevents the ball 33 from falling off. Reference numeral 58 is a sealing material.

In particular, as is apparent from FIG. 2, the two divided portions 45 forming the joint body 1 are formed so that the opposing surfaces of both portions are substantially spherical, and the relative deformation causes the outward deformation to surface. It is formed so as not to appear. Further, as shown in FIG. 3, the nipple body 2 can freely rotate with respect to the sleeve body 1 at an angle of maximum 2θ. [Embodiment 2] In the universal rotary joint 10 in this embodiment, the sleeve portion 1 formed with the screw 11 for coupling to the fitting on the output side is divided into one of the rotary joint portions 3 as is apparent from FIGS. 4 and 6. The plug part 2 integrally formed with the other part, and further having the flag 21 formed at the end formed on the side of the shaft 32 formed in the tubular part, is integrally formed with another one of the divided parts of the other rotary joint part 3, and Pivot ring 31 formed as a cylindrical recess
It is configured to be formed on the side. Further, a rotation plane orthogonal to the axis is formed between the plug portion 2 and the intermediate body 7 functioning as a rotary joint portion, and inclined rotation surfaces 71 and 72 are formed between the intermediate body formed of a cylindrical body and the plug portion. Has been done. The two inclined planes of rotation are configured as elliptical planes obtained by obliquely cutting a cylinder.

By setting the angle θ of the inclined plane of rotation to about 22.5 degrees with respect to the axis, the nipple portion can swing to any angle within a range of about 90 degrees with respect to the plug portion. Has been done.

[0026]

According to the universal rotary joint of the present invention, the nipple portion and the sleeve are combined by combining the axial rotations on the two inclined planes without the need for machining requiring a high technology such as a spherical arc or a concave arc. It is possible to swing the parts relative to each other three-dimensionally, and it is possible to supply an inexpensive universal joint.

Further, since the angle is changed by rotating the flag portion or the intermediate body of the nipple body on the plane, when the socket of the quick fluid coupling is mounted on the flag portion, the pressing force of the socket is the pressing force of the socket. Since it does not act as a rotating force on the socket, the socket can be easily mounted without changing the angle of the plug portion, tilting or shifting when the socket is pressed.

Since the angle is changed by rotating, the rotating force does not act only by the gravity of the plug portion or the nipple portion when the socket is not attached, so that the plug portion or the nipple portion is not inadvertently bent. As a result, the shape with the socket removed is retained,
When the tool is stored in the case or the like, it becomes easy to store the tool in a predetermined space. Further, automatic assembly using a robot or the like is possible, and the manufacturing cost of the tool itself can be reduced.

Since the structure is such that the flat surfaces face each other and rotate, dust or the like does not easily enter the rotary part, and dust does not enter the rotary part without providing a cover such as a bellows for dust prevention, which makes rotation difficult. There is no effect.

When the portion forming the rotation surface inclined with respect to the axis is formed in a cylindrical shape, the outer diameter shape becomes small and smart when the joint is arranged in a straight line. As compared with the external shape, a larger flow path diameter than the conventional one can be secured, the action of the fluid pressure can be reduced, and the rotation resistance due to the pressure action is small, so that more free rotation can be maintained.

When the portion forming the rotation surface inclined with respect to the axis is formed into a spherical shape, the outer shape in a state where the rotation flat surface portion is refracted without generating a step on the peripheral edge of the flat surface due to the rotation is smart. become.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a universal joint according to the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is an explanatory view of the operation of the embodiment.

FIG. 4 is a front view of another embodiment.

5 is a longitudinal sectional view of FIG.

FIG. 6 is an explanatory view of the operation of another embodiment.

7 is a longitudinal sectional view of FIG.

[Explanation of symbols]

l Sleeve body (plug part) 2 Nipple body (nipple portion) 3 Joint body (intermediate body) 4 divisions 5 divisions 6 passages 20 Rotating joint 23 Pivot ring (cylindrical recess) 30 Sliding part 31 Pivot ring 32 shafts (cylindrical part) 33 balls 34 groove 35 groove 36 Set screw 37 insertion bill θ inclination angle

Claims (5)

[Claims] 1. A hollow nipple body having a mounting portion for a tool or a fluid hose formed at one end thereof, and a hollow sleeve body having one member constituting a quick fluid coupling mounted at the other end thereof. A hollow intermediate body disposed between the intermediate body and the nipple body, and between the sleeve body and the intermediate body are rotatable along planes inclined at different angles with respect to the axial direction. A universal rotary joint formed by forming each fluid joint. 2. The universal joint according to claim 1, wherein one of the two inclined planes is formed on a plane orthogonal to the extension direction of the axis. 3. A cylindrical recess in which each rotary fluid joint is formed on one member side along an axis perpendicular to each surface, and the other member rotatably accommodated in the recess. Both ends are rotatably held by an annular groove formed on the inner wall of the cylindrical recess and a plurality of steel balls housed in an annular groove formed on the outer peripheral surface of the cylindrical portion. The universal joint according to claim 1 or 2, wherein 4. The outer shape of one end side of the hollow body and one end side of the nipple portion on the side of the rotation surface formation are hemispheres, and one of the planes passes through substantially the center of the sphere and is inclined with respect to the axis of the nipple. The universal joint according to claim 1, wherein the universal joint is formed in a flat surface. 5. An end portion of a nipple body on which a rotation surface is formed and an intermediate body are formed in a cylindrical outer shape having the same outer shape when they are arranged along the axial direction, and one plane is a cylinder. The universal joint according to claim 1, wherein the universal joint is formed by a plane inclined with respect to the axis of the.