JP2004167682A - Rotary joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the abnormal wear or the like of a sliding part by preventing the infiltration of dust, waterdrops, or the like into the sliding part in a rotary joint A provided with a power slip ring 21 and an electric signal slip ring 31 for transferring electricity between a fixed body 1 and a rotation body 6. <P>SOLUTION: Parts to be the boundary surfaces of the fixed body 1 and rotation body 6 on the respective outer peripheral surfaces are provided as boundary groove parts 90, 93, and the side face of one of the boundary groove parts 90, 93 is formed as an inclined face. Ring-like sealing members 91, 94 are fitted into the boundary groove parts 90, 93 so as to abut on the inclined face. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a rotary joint provided at a distal end portion of an arm of a robot or the like, and particularly to a technical field related to a structure for sealing in order to stably transfer and receive electricity and fluid between a fixed body and a rotating body.

  2. Description of the Related Art Conventionally, this type of rotary joint includes, for example, a fixed body attached to and fixed to a distal end portion of a robot arm, and a rotating body attached and fixed to a hand side of the robot and rotatably connected to and supported by the fixed body. Fluids such as air, cooling water, welding gas, and motive power, and electric signals such as electric signals can be exchanged between the fixed body and the rotating body. It can be exchanged.

  In order to transfer the fluid, a swivel joint in which a plurality of types of fluid passages are arranged side by side between the sliding surfaces of the fixed body and the rotating body is used. A power slip ring is used, which includes a current collecting ring provided on one of the two sides and a sliding contact provided on the other side for supplying electricity by slidingly contacting the current collecting ring.

Further, an electric signal slip ring is known for transmitting and receiving an electric signal between a fixed body and a rotating body. As an example of the electric signal slip ring, conventionally, as shown in Patent Document 1, for example, a ring plate-shaped fixed side electrode provided on a fixed body side and a ring plate-shaped rotating side electrode provided on a rotating body side And a rolling element disposed between the two electrodes, wherein the rolling element rolls on the two electrodes by relative rotation of the rotating body with respect to the fixed body so that an electric signal is transmitted and received between the two electrodes. Proposed.
JP-A-10-223346

  By the way, as described above, the rotary joint is provided with a slip ring for transmitting electric power and an electric signal between the fixed body and the rotating body in a state of rotation of both, and this slip ring is provided from outside the rotary joint. If dust, water, or the like adheres, abnormal wear of the sliding portion may occur, and it is desirable to take some measures.

  The present invention has been made in view of such a point, and a main object of the present invention is to prevent dust or water droplets from entering the sliding portion of the rotary joint to prevent the sliding portion from malfunctioning. An object of the present invention is to prevent wear and the like.

  In order to achieve the above object, the invention of claim 1 is directed to a rotary joint including a fixed body and a rotating body rotatably connected to and supported by the fixed body. A portion serving as a boundary surface between the fixed body and the rotating body is provided in a boundary groove portion, and either side surface of the boundary groove portion is an inclined surface, and a ring shape is formed in the boundary groove portion. Is fitted so as to abut the inclined surface.

  According to the above configuration, one of the side surfaces of the boundary groove is inclined, and the ring-shaped seal member is fitted into the boundary groove so as to always contact the inclined side surface. Therefore, even if the use environment of the rotary joint is not a clean environment but an environment where dust and splashes are present, the dust and splashes and the like from the boundary between the fixed body and the rotating body by a simple configuration. By preventing intrusion into the inside of the rotary joint, it is possible to prevent breakdowns and accidents.

  As described above, according to the first aspect of the present invention, a rotary joint including a fixed body and a rotating body rotatably connected to and supported by the fixed body is provided on both outer circumferential surfaces of the fixed body and the rotating body. The boundary groove portion is provided in the boundary groove portion, and any one side surface of the boundary groove portion is an inclined surface, and a ring-shaped seal member is fitted in the boundary groove portion so as to be in contact with the inclined surface, With a simple configuration, it is possible to prevent dust and splashes from entering the inside of the rotary joint from the boundary between the fixed body and the rotating body, thereby preventing failures and accidents.

  FIGS. 10 to 12 show a rotary joint A according to an embodiment of the present invention. The rotary joint A is attached to an arm tip of a welding robot (not shown) that performs spot welding.

  The rotary joint A includes a substantially cylindrical fixed body 1 attached to the arm side of the welding robot, and a substantially cylindrical rotating body 6 attached to the welding gun side (hand side). 1 is connected and supported so as to be rotatable at an angle of 360 ° or more.

  As shown in FIG. 1 in an enlarged manner, the fixed body 1 has a cylindrical boss portion 3 integrally formed with an outward flange 2 at an upper end (the upper end in FIG. 1), and an outer periphery thereof is attached to the boss portion 3. A bottomed cylindrical cover portion 4 which is concentrically arranged so as to surround and is integrally fixed, and is opened downward.

  On the other hand, the rotating body 6 is integrally fixed to a cylindrical shaft portion 7 fitted into the boss portion 3 of the fixed body 1 so as to be relatively rotatable, and to an upper end of the shaft portion 7 so as to close the opening. An upper flange 8 located above the outward flange 2 of the rotating body 6 and an outer periphery of a lower end of the shaft 7 are integrally fixed to each other. A lower flange 9 extending radially outward to close the opening.

  A swivel joint 11 for exchanging water and air as a fluid between the fixed body 1 and the rotating body 6 is provided between the boss 3 of the fixed body 1 and the shaft 7 of the rotating body 6. ing. The cylindrical space surrounded by the boss portion 3 and the cover portion 4 of the fixed body 1 and the lower flange 9 of the rotating body 6 has electric power for supplying welding power from the fixed body 1 to the rotating body 6. A slip ring 21 and an electric signal slip ring 31 located inside the electric power slip ring 21 for transmitting and receiving a plurality of (six types in the illustrated example) different electric signals between the fixed body 1 and the rotating body 6 are provided. Mounted concentrically.

  The swivel joint 11 has two water passages 12, 13 and one air passage 14, and these three passages 12 to 14 have the same structure. That is, as shown in FIG. 5, three annular grooves 15, 15,... Are formed on the inner peripheral surface of the boss portion 3 of the fixed body 1 at intervals in the vertical direction (axial direction). The three annular grooves 15, 15,... Are closed by the outer peripheral surface of the shaft portion of the rotating body, so that fluid can flow between the fixed body 1 and the rotating body 6 between the fixed body 1 and the rotating body 6. A plurality of annular passages 30, 30, ... extending in the circumferential direction for transmission and reception are formed in parallel in the axial direction. Also, three vertical holes 16, 16,... (Only some are shown) extending vertically are formed in the wall of the boss 3 so as to penetrate close to each other in the circumferential direction. Are open on the groove bottom surface of the corresponding annular groove 15 respectively, while the upper end is open on the outer peripheral surface of the outward flange 2.

  On the other hand, three vertical holes 17, 17,... (Only some of which are shown) extending vertically are formed at three equally spaced positions in the circumferential direction in the wall of the shaft portion 7 of the rotating body 6, The upper end of each of the vertical holes 17 is opened on the outer peripheral surface of the shaft portion 7 so as to communicate with the inside of each of the annular grooves 15 in the boss portion 3 of the fixed body 1, while the lower end of each of the vertical holes 17 is lower. The shaft portion 7 has an opening on the outer peripheral surface below the side flange 9.

  An annular space filled with air is provided between the annular passage and the electric slip ring, and the annular space forms an annular passage forming an air flow path of the swivel joint 11.

  That is, of the three annular passages 30, 30,... Formed in this manner, the upper two annular passages 30, 30 correspond to the water passages 12, 13, and the lower one annular passage 30 corresponds to the air passage 14. The water passages 12 and 13 and the air passage 14 allow water and air to be exchanged between the stationary body 1 and the rotating body 6 even in the both rotating states.

  As shown in FIGS. 8 and 9, four seal grooves 18 are provided on the inner peripheral surface of the boss portion 3 of the fixed body 1 on both sides in the vertical direction (axial direction) of the three annular grooves 15. Are formed in each of the seal grooves 18. A rubber seal ring 19 as a ring-shaped seal member for sealing the annular passages 30, 30,. It is fitted so as to be in sliding contact with the outer peripheral surface to seal. As shown in FIG. 9, the seal ring 19 has concave grooves 19 b, 19 b,. A groove-shaped seal groove 19a meandering in the direction is formed, and the seal groove 19a is filled with grease as a lubricant. The seal groove portion 19a is formed with a lubricant storage portion 19c whose groove width is increased at regular intervals in the circumferential direction (the circumferential direction of the fixed body 1). As shown in FIG. 8, sliding portions 19d, 19d,... Formed as ridges are provided between the lubricant storage portions 19c, 19c,.

  The power slip ring 21 includes three current collecting rings 22, 22 concentrically arranged in a cylindrical space between the boss portion 3 and the cover portion 4 of the fixed body 1 and the lower flange 9 of the rotating body 6. ,.., And these current collecting rings 22, 22,... Are vertically stacked via insulating rings 23, 23,. A tip (upper end) of a current collecting bolt 24 that penetrates the other current collecting ring 22 while being electrically insulated from the other current collecting ring 22 is screwed into the current collecting ring 22. Penetrates the lower flange 9 in an insulated state, and a head portion 24a at a lower end thereof protrudes below the lower flange 9, and the head portion 24a is provided with a power cable 25 for conducting to a welding gun (not shown). The ends are connected.

  On the other hand, on the side wall of the cover portion 4 of the fixed body 1, three sliding contacts 26, 26,... Penetrate in an insulated state at positions close to each other at equal intervals in the circumferential direction and are covered by the cover 26a. The inner end of each of the sliding contacts 26 is pressed against the corresponding outer peripheral surface of each of the current collecting rings 22 in a slidable manner with a predetermined pressing force. A large current welding power is supplied between the fixed body 1 and the rotating body 6 by sliding contact between the power collector ring 22 and the stationary body 1 and the rotating body 6.

  Further, the electric signal slip ring 31 has a cylindrical inner housing 32 externally fitted to the outer periphery of the boss 3 of the fixed body 1 and an annular space 34 around the inner housing 32 as described later. And a cylindrical outer housing 33 provided concentrically and externally fitted, and both housings 32, 33 are made of resin or the like. Outward flange portions 32a, 32b are integrally formed at upper and lower ends of the outer peripheral surface of the inner housing 32, and both flange portions 32a, 32b, an upper and lower intermediate portion of the outer peripheral surface of the inner housing 32, and an outer housing An annular space 34 having a cylindrical shape is defined by being surrounded by 33.

  In the annular space 34 between the inner and outer housings 32 and 33, six ring-shaped fixed electrodes 36a to 36f and rotating electrodes 40a to 40f are accommodated. These electrodes 36a to 36f and 40a to 40f are made of, for example, phosphor bronze, and the surfaces thereof are silver-plated. 2 and 3, the six fixed electrodes 36a to 36f are arranged concentrically with the axis of the fixed body 1 and arranged vertically in the axial direction. On the other hand, the six rotating electrodes 40 a to 40 f are also arranged concentrically with the axis of the rotating body 6 and arranged in the vertical direction, which is the axial direction.

  Of the six fixed electrodes 36a to 36f, those 36a and 36f located at the upper and lower ends (axial ends) are end electrodes, and the fixed electrodes 36a and 36f as the end electrodes are excluded. As for the four fixed electrodes 36b to 36e, as shown in FIG. 6, a pair of fixed electrodes 36b, 36c and 36d, 36e adjacent in the axial direction are both electrodes 36b, 36c and 36d, 36e. The two fixed-side electrode laminates 38a, 37a, 37b are arranged between the electrodes 36b, 36c, 36d, 36e and the fixed-side insulating sheets 37a, 37b. 38b are formed.

  On the other hand, in the six rotating electrodes 40a to 40f, as shown in FIG. 7, a pair of rotating electrodes 40a, 40b, 40c, 40d and 40e, 40f adjacent in the axial direction are provided. The two electrodes 40a, 40b, 40c, 40d and 40e, 40f are laminated and disposed between the rotating electrodes 40a, 40b, 40c, 40d, and 40e, 40f. Three rotating-side electrode laminates 42a to 42c are formed by the rotating-side insulating sheets 41a to 41c.

  The two fixed-side electrode laminates 38 a and 38 b and the three rotating-side electrode laminates 42 a to 42 c are fixed-side electrodes serving as the pair of end electrodes located at the axial ends of the electric signal slip ring 31. 36a and 36f are alternately arranged in the vertical direction as the axial direction.

  Further, between the fixed-side electrodes 36a, 36f, which are the end electrodes, and the rotating-side electrodes 40a, 40f of the rotating-side electrode laminates 42a, 42c axially facing the fixed-side electrodes 36a, 36f at the ends. And between the opposed fixed-side electrodes 36b to 36e and the rotating-side electrodes 40b to 40e in the fixed-side electrode laminates 38a and 38b and the rotation-side electrode laminates 42a to 42c adjacent in the axial direction, respectively. A rolling element 44 composed of a steel ball that rolls on both electrodes 36a to 36f and 40a to 40f by a relative rotation with respect to the fixed body 1 and transmits and receives an electric signal between the two electrodes 36a to 36f and 40a to 40f is provided. I have. As shown in FIG. 4, a plurality of steel balls 44 are provided at predetermined intervals in the circumferential direction between the electrodes 36a to 36f and 40a to 40f, and the plurality of rolling elements 44, 44,. Each is fitted and held in a holding hole 45a of a ring plate-shaped retainer 45 located between both electrodes 36a to 36f and 40a to 40f. Each rolling element 44 is, for example, a steel ball obtained by quenching carbon steel, and the surface thereof is silver-plated.

  An annular spring groove 47 is formed on the upper surface of the lower flange portion 32b of the inner housing 32. In the spring groove 47, a fixed side electrode 36f serving as a lower end electrode is fixed to an upper side fixed electrode serving as an end electrode. A spring 48 is housed as a pressing means for pressing the electrode 36a. A ring-plate-shaped insulator 49 is interposed between the fixed-side electrode 36f, which is the lower end electrode, and the spring 48, and the spring 48 is pressed through the insulator 49.

  An annular packing groove 50 is formed on the outer peripheral surface of the upper flange portion 32a of the inner housing 32. The packing groove 50 is provided with a packing 51 made of rubber or the like having a substantially V-shaped cross section and having a lip portion 51a. The outer housing 33 is accommodated in a state where the upper surface of the outer housing 33 is pressed by the lip portion 51a, and the packing 51 seals the gap between the upper ends of the housings 32 and 33.

  The inner housing 32 on the fixed body 1 side is formed with a rectangular bottomed hole 53 that opens on the upper surface thereof. A connector mounting portion 55 having a screw hole 54 is integrally attached to the outer peripheral surface of the cover portion 4 of the fixed body 1, and a fixed connector 56 is mounted and fixed to the screw hole 54 by screwing. The screw hole 54 of the connector mounting portion 55 communicates with the bottomed hole 53 of the inner housing 32 via a through hole 57 formed in the cover portion 4. As shown in FIG. 6, a connection terminal 36g located in the bottomed hole 53 of the inner housing 32 protrudes from the inner peripheral edge of each of the fixed-side electrodes 36a to 36f. One end of the fixed electric wire 58 is connected and fixed. The six fixed-side electric wires 58 extend through each of the bottomed hole 53, the through-hole 57 of the cover part 4, and the screw hole 54 of the connector mounting part 55, and the other ends thereof are connected to the fixed side. It is connected to a connector 56.

  On the other hand, a cutout portion 63 is formed on the outer peripheral surface of the outer housing 33 on the rotating body 6 side by partially cutting a part of the outer housing 33 into a rectangular shape from the lower surface. A connector mounting portion 65 having a screw hole 64 is integrally attached to the outer peripheral surface of the lower flange 9 of the rotating body 6, and a rotating connector 66 is attached and fixed to the screw hole 64 by screwing. Reference numeral 64 communicates with the inside of the cutout 63 of the outer housing 33 through a through hole 67 formed in the lower flange 9. As shown in FIG. 7, a connection terminal 40g located in the cutout 63 of the outer housing 33 is protruded from the outer peripheral edge of each of the rotation-side electrodes 40a to 40f. One end of the electric wire 68 is connected and fixed. The six rotating electric wires 68 extend through the notch 63, the through hole 67 of the lower flange 9, and the screw hole 64 of the connector attaching portion 65, and the other ends of the electric wires are connected to the rotating connector 66. It is connected.

  By conducting the fixed electrodes 36a to 36f and the rotating electrodes 40a to 40f facing the fixed electrodes 36a to 40f via the sphere 44, as shown in Table 1, the rotation between the fixed body 1 and the rotating body 6 is performed. Even in the state, six kinds of electric signals are transmitted and received.

  Further, as shown in FIG. 2, FIG. 3, and FIG. 6, the outer peripheral edge of each of the fixed electrodes 36a to 36f is circular, while the inner peripheral edge is equally spaced in the circumferential direction. A plurality (five in the illustrated example) of abutting portions 36h, 36h,... Protrude at positions, and the fixed-side electrodes 36a to 36f abut the abutting portions 36h, 36h,. The fixed side electrodes 36a to 36f are fitted and supported in a state where they are positioned, and a predetermined gap is provided between the outer peripheral edge of the fixed side electrodes 36a to 36f and the inner peripheral surface of the outer housing 33.

  On the other hand, as shown in FIG. 2, FIG. 3, and FIG. 7, the inner peripheral edge of each of the rotating electrodes 40a to 40f is formed in a circular shape, while the outer peripheral edge is positioned at equal intervals in the circumferential direction. A plurality of (five in the illustrated example) contact portions 40h, 40h,... Are protruded, and the rotating electrodes 40a to 40f are brought into contact with the contact portions 40h, 40h,. It is fitted and supported in a positioned state, and a predetermined gap is provided between the inner peripheral edge of the rotating electrodes 40a to 40f and the outer peripheral surface of the inner housing 32.

  As a feature of the present invention, a boundary groove is formed on each of the outer peripheral surfaces of the fixed body 1 and the rotating body 6 so that a portion serving as a boundary between them has a V-shaped or R-shaped cross section. Are fitted.

  That is, as shown in FIG. 1, the lower part of the outer peripheral surface, which is the side surface of the upper flange 8 of the rotating body 6, is chamfered so that the lower part of the outer peripheral surface of the upper flange 8 and the upper surface of the boss part 3 of the fixed body 1 are fixed. The boundary groove 90 is formed to have a U-shaped cross section, and a rubber O-ring 91 is fitted into the boundary groove 90.

  On the other hand, the upper peripheral surface, which is the side surface of the lower flange 9 of the rotating body 6, and the lower peripheral surface, which is the side surface of the cover portion 4 of the fixed body 1, are chamfered to form the outer peripheral surface of the lower flange 9. A boundary groove 93 between the upper part and the lower part of the outer peripheral surface of the cover part 4 has a V-shaped cross section, and a rubber O-ring 94 is fitted in the boundary groove 93.

  Therefore, in this embodiment, when the rotating body 6 is rotating with respect to the fixed body 1 when the welding gun operates the welding robot that welds the work, two water passages and air between the fixed body 1 and the rotating body 6 are provided. Water and air are exchanged through the passage 14. Further, the sliding contact 26 on the fixed body 1 and the current collecting ring 22 on the rotating body 6 are in sliding contact with each other, and a large amount of welding power is supplied from the fixed body 1 to the rotating body 6 side. Further, six kinds of electric signals are transmitted and received between the fixed body 1 and the rotating body 6 in a rotating state of both.

  At this time, since the air passage 14 is provided between the water passages 12 and 13 of the swivel joint and the power slip ring 21 and the electric signal slip ring 31, the water flowing through the water passages 12 and 13 is Even if the water leaks to the power slip ring 21 and the electric signal slip ring 31, the leaked water reaches the vicinity of the air passage 14 before reaching the power slip ring 21 and the electric signal slip ring 31. The intrusion of a body of water into the air passage 14 can be suppressed by the air pressure (even if a predetermined amount of water enters the air passage 14, the water can be stored in the air passage 14). . As a result, it is possible to prevent the leaked water from entering the power slip ring 21 and the electric signal slip ring 31.

  Conventionally, as the sealing member, an X-ring having a substantially X-shaped cross section in which a concave groove is formed on the sealing surface is used. The fluid passage is sealed by filling the groove on the ring seal surface with a lubricant such as grease, but in this case, it is continuously fixed at both ends of the groove on the seal surface of the X ring. Since the lubricant does not flow to both ends of the concave groove due to sliding contact with the body or the rotating body, there is a possibility that abrasion of both ends of the concave groove may be accelerated.

  On the other hand, according to the configuration of the present invention, since the seal groove 19a meanders in the ring circumferential direction, as shown in FIG. Can be turned to the flat portion between the adjacent lubricant storing portions 19c, 19c (the flat portion on which the sliding portion 19d is formed). Therefore, since the lubricant can be applied to all the ends of the meandering groove in the seal groove 19a, the wear of both ends of the groove can be suppressed. Accordingly, a more reliable seal can be achieved, and a failure or the like due to leakage of water from the water passages 12 and 13 can be prevented.

  Further, by providing the sliding portion 19d, the flat portion between the adjacent lubricant storing portions 19c can be supported, so that the seal ring is not twisted in the axial direction of the shaft portion 7.

  And, even if the use environment of the rotary joint is not a clean environment but an environment in which dust, splashes and the like are present, as in the present invention, the boundary portion between the outer peripheral surfaces of the fixed body 1 and the rotating body 6 is used. The O-rings 91 and 94 are fitted into the rotary joint A with a simple configuration to prevent the dust and splashes of the fixed body 1 and the rotating body 6 from entering the inside of the rotary joint A from the boundary. Failures and accidents can be prevented before they occur.

  In the above embodiment, the lower annular passage is the air passage 14 and the upper two annular passages are the water passages 12 and 13 in place of the swivel joint 11, but instead of the lower air passage 14, An annular space that is closed and filled with air may be provided. Further, instead of the air passage 14, a drain passage for discharging water leaked from the water passages 12, 13 may be used. By doing so, the same effect as in the above embodiment can be obtained.

  Then, instead of the upper water passage 12 in the swivel joint 11, an annular space that is closed and filled with air may be provided. Alternatively, an air passage may be provided for exchanging air between the fixed body 1 and the rotating body 6. By doing so, in addition to the effect of the above-described embodiment, an effect that water flowing through the water passage 13 can be prevented from flowing out of the rotary joint A can be obtained.

  Further, in the present embodiment, the case where the three annular passages 30 are provided in the swivel joint 11 has been described, but the present invention can be applied to a case where a plurality of other annular passages 30 are provided. In this case, the annular passages or the annular passages 30 between the annular spaces located on both sides in the axial direction do not need to be all the same water passages, and may be annular passages through which other fluids flow.

  Further, in the above-described embodiment, the outflow of the water flowing through the water passage 13 is prevented. However, the present invention is not limited to the water, and may be a gas such as a chlorine gas or another fluid such as an oil. Can also be applied to the annular passage 30 through which the air flows.

  And the rotary joint of the present invention is not limited to the one provided with the slip rings 21 and 31. That is, a swivel is applied to a rotary joint including the fixed body 1, a rotating body 6 rotatably connected to and supported by the fixed body 1, and a swivel joint 11 for exchanging fluid between the fixed body 1 and the rotating body 6. The joint 11 has one or more annular passages 30 formed in the axial direction between the fixed body 1 and the rotating body 6 and extending in the circumferential direction. A filled annular space may be provided.

  Further, at this time, at least one of the two annular spaces may constitute an annular passage 30 forming an air passage of the swivel joint.

  In this way, since the annular space is provided between the annular passage 30 of the swivel joint 11 and the outside of the rotary joint, the fluid flowing through the annular passage 30 leaks to the outside of the swivel joint. However, the leaked fluid reaches the annular space before reaching the outside of the rotary joint, and the fluid can be prevented from entering the annular space by the air pressure in the annular space. Therefore, it is possible to prevent the fluid flowing in the annular passage 30 from flowing out.

It is an expanded sectional view of a rotary joint concerning an embodiment of the present invention. It is sectional drawing which expands and shows one side part of an electric signal slip ring. It is sectional drawing which expands and shows the other side part of an electric signal slip ring. FIG. 2 is an enlarged perspective view showing an electric signal slip ring with a part thereof cut away. FIG. 4 is a partially cutaway perspective view showing components of a water passage and an air passage in a boss portion of a fixed body. FIG. 3 is a perspective view illustrating a configuration of a fixed electrode laminate. It is a perspective view showing composition of a rotating electrode lamination. FIG. 4 is an explanatory diagram showing a sliding contact surface of a seal ring in a developed manner. FIG. 3 is a partially sectional perspective view showing a seal ring. It is a top view of a rotary joint. It is a front view of a rotary joint. It is a bottom view of a rotary joint.

Explanation of reference numerals

Reference Signs List A Rotary joint 1 Fixed body 3 Boss part 6 Rotating body 7 Shaft part 11 Swivel joint 12, 13 Water passage 19 Seal ring (seal member)
19a Seal groove portion 21 Power slip ring 30 Annular passage 31 Electric signal slip ring 36a to 36f Fixed side electrode 40a to 40f Rotation side electrode 70 Fluid passage 90, 93 Boundary groove portion 91, 94 O-ring

Claims (1)

A rotary joint comprising a fixed body and a rotating body rotatably connected to and supported by the fixed body,
A portion serving as a boundary surface between the outer peripheral surfaces of the fixed body and the rotating body is provided in a boundary groove portion,
Either side surface of the boundary groove is an inclined surface,
A rotary joint, wherein a ring-shaped seal member is fitted into the boundary groove so as to abut on the inclined surface.

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