JPS6348860Y2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a fluid supply device that is attached to a rotating body in order to supply a fluid such as a liquid or gas to the rotating body.

(Prior art and its problems) Conventionally, as a fluid supply device for supplying fluid to a rotating body, there has been a small rotary joint that supplies relatively easy-to-process oil and air to the rotating body. There is. This rotary joint has a structure in which a seal member is interposed on the sliding surface between a fixed member and a rotating member rotatably fitted to the fixed member to prevent oil or air from leaking to the outside. It's summery. For this reason, the sealing member tends to wear out in a short period of time, and the sealing member is frequently replaced every time the sealing member wears out. Replacing this sealing member requires a great deal of effort and time because it requires disassembling the fluid supply device.

When supplying oil or air to a rotating body, it is easy to take measures against some leakage.
Even if it can withstand a certain degree of resistance, when cooling water is supplied, if the cooling water leaks, the device will corrode, so it is necessary to replace the sealing member immediately if a leak is discovered. From such a thing,
There has been a strong demand for a fluid supply device that can cause as little wear and tear on the sealing member as possible and can reliably prevent fluid leakage.

(Means for Solving the Problems) The present invention aims to solve the above problems and provide a fluid supply device that can significantly extend the replacement cycle of the sealing member and prevent fluid leakage. be. Therefore, the technical means of the present invention is to rotatably fit the rotating shaft into the through hole of the main body for fixing the position, to form an annular fluid path between the rotating shaft and the main body, and to connect the rotating shaft and the main body. The main body is provided with a first fluid path and a second fluid path that communicate with the annular fluid path, and a sealing member is interposed between the main body and the rotating shaft to prevent leakage of fluid from the annular fluid path, A grease groove for lubricating the sliding surface between the main body and the rotating shaft is provided on the outside of the seal member to support the seal member, and a through hole extending in the axial direction is bored in the rotating shaft. , is characterized in that a mounting shaft connected to the rotating body is fitted into the through hole. As the sealing member, an O-ring, an oil seal, a V-packet, etc. can be used.

In the fluid supply device of the present invention, a grease groove is provided on the outside of the seal member that prevents fluid from leaking from the annular fluid path to lubricate the sliding surface between the main body and the rotating shaft. Frictional resistance between the shafts is significantly reduced, extending the life of the sealing member. Even if the sealing member wears out and fluid leaks from the sealing member, the grease injected into the grease groove is in close contact with the outer circumferential surface of the rotating shaft, so the grease can reliably prevent fluid from leaking to the outside. .

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 is a fluid supply device, 2 is a cylindrical body for position fixing, and the body 2 has a cylindrical body that extends in the axial direction. A through hole 3 is bored. A rotary shaft 4 is rotatably fitted into the through hole 3 of the main body 2, and a dowel mounting portion 5 is provided at one end of the rotary shaft 4 for attaching the fluid supply device 1 to the rotary body 62. It is being Bearings 6 and 7 are interposed between the main body 2 and the rotating shaft 4. A through hole 8 extending in the axial direction is bored in the rotating shaft 4.
is formed coaxially with the through hole 3 of the main body 2.

9, 10, 11 are annular grooves formed in the through hole 3 of the main body 2 at intervals in the axial direction; 12, 13, 1;
4 is an annular groove 9 of the main body 2 on the outer peripheral surface of the rotating shaft 4;
10, 11, and the annular grooves 9, 10, 11 of the main body 2 and the annular groove 1 of the rotating shaft 4.
2, 13, 14, annular fluid passages 15, 16,
17 are configured. Annular fluid passages 15, 16,
Drain holes (not shown) are provided at appropriate locations in each of the drain holes 17. 18, 19, and 20 are fluid passages (first fluid passages) bored in the rotating shaft 4;
As shown in FIG. 2, these fluid passages 18, 19, and 20 are provided at intervals in the periphery of the rotating shaft 4, and are opened in the solder fitting portion 5 on one end of the rotating shaft 4. There is.

The annular grooves 12, 13, 14 of the rotating shaft 4 are provided with fluid passages 18, 19, 20 and the annular fluid passages 15, 1.
6, 17, annular communication passages 21, 22,
23 is formed. 24, 25, 26 are formed on the outer peripheral surface side of the main body 2, and are annular fluid passages 15, 16,
Pipe joints 27, 28, and 29 are attached to the ports of the fluid paths 24, 25, and 26, respectively, in the fluid path (second fluid path) that communicates with the fluid path 17.

Between the main body 2 and the rotating shaft 4, O-rings 30, 31, 32, 33, 34, 3 are provided as sealing members.
5 is interposed, and the O-rings 30, 31, 32, 3
3, 34, 35 are annular fluid passages 15, 16, 17
are arranged on both sides of the annular fluid passages 15 and 1, respectively.
It has a function of preventing fluid from leaking from the holes 6 and 17. An O-ring 3 is inserted into the through hole 3 of the main body 2.
Grease grooves 36, 37, 38, 39 are formed on the outside of 0, 31, 32, 33, 34, 35. The grease grooves 36, 37, 38, 39 have grease supply paths 40, 4 for supplying grease to the grease grooves 36, 37, 38, 39.
1, 42, and 43 are provided in communication with each other.

Reference numeral 44 denotes a mounting shaft for connecting the rotating shaft 4 of the fluid supply device 1 to the rotating body 62, and the mounting shaft 44 is provided to fit into the through hole 8 of the rotating shaft 4. A threaded portion 45 is carved on the outer periphery of the end on the mounting side of the mounting shaft 44, and a threaded portion 46 is carved on the outer periphery of the end on the tightening side of the mounting shaft 44. A tightening nut 48 is screwed into the threaded portion 46 via a washer 47.

A cover 49 is fixed to the other end of the rotating shaft 4 and presses and holds the inner ring of the bearing 6. Reference numeral 50 denotes a lid fixed to the other end of the main body 2, and pipe fittings 27, 28, 29 are installed at appropriate positions on the lid 50, as shown in FIG.
A support hole 5 for supporting a pipe to be described later connected to
1, 52, and 53 are drilled. Grease nipples 54, 55, 56, 5 for injecting grease into the grease grooves 36, 37, 38, 39 are provided at appropriate positions on the side opposite to the support holes 51, 52, 53 of the lid 50.
7 is fixed.

Reference numeral 58 denotes a rotation stop groove for engaging with a yoke (not shown) to prevent rotation of the main body 2, and is formed at a suitable location on the outer periphery of the lid 50. Reference numeral 59 denotes a pipe connected to the pipe joint 28, and pipes (not shown) are similarly connected to the pipe joints 27 and 29. 60 is a pipe connecting the grease supply path 43 and the grease nipple 54; 61 is a locking key for positioning the rotational direction when connecting the rotating body 62 and the rotating shaft 4; 63 is a locking key for connecting the rotating body 62 to the rotating shaft 4; This is a perforated fluid path.

To explain how to attach the fluid supply device 1 configured as above to the rotating body 62, when attaching the fluid supply device 1 to the rotating body 62, first attach the threaded portion 45 on the mounting side of the mounting shaft 44 to the rotating body. 62, and then fit the through hole 8 of the rotating shaft 4 of the fluid supply device 1 into the mounting shaft 44, and position the rotary direction using the locking key 62. Then, the fluid passages 18, 19 on the rotating shaft 4 side,
20 and the fluid path on the rotating body 62 side, for example, the fluid path 18 and the fluid path 63, respectively, and fitting the dowel mounting portion 5 of the rotating shaft 4 with the rotating body 62,
Finally, by tightening the tightening nut 48 that is threaded into the threaded portion 46 of the mounting shaft 44, the mounting of the fluid supply device 1 to the rotating body 62 is completed.

Now, if we inject grease from the grease nipple 54, the injected grease will flow into the pipe 6.
0, the grease groove 39 passes through the grease supply path 43
will be sent to When the grease is fed to the grease groove 39 and the grease groove 39 is filled with grease,
This grease lubricates the sliding surfaces between the main body 2 and the rotating shaft 4 by the injection pressure and the rotation of the rotating shaft 4.
In this case, since the grease also lubricates the contact portion between the O-ring 35 and the rotating shaft 4, the contact resistance between the O-ring 35 and the rotating shaft 4 is reduced, and the life of the O-ring 35 can be extremely extended. Furthermore, even if the O-ring 35 is worn out and fluid leaks from the annular fluid path 17 through the O-ring 35, the leaked fluid will be transferred to the rotating shaft 4 due to the injection pressure of the grease filling the grease groove 39. Since it is in close contact with the outer peripheral surface, the grease reliably prevents the fluid from leaking to the outside. Although the case where grease is injected into the grease groove 39 has been described above, the same applies to the case where the grease is injected into the grease grooves 36, 37, and 38.

Next, a case will be described in which fluid is supplied to the rotating body 62 using the fluid supply device 1. It is assumed that the grease grooves 36, 37, 38, and 39 are injected and filled with grease by the above-mentioned means. The pipe joint 27 is connected to an air source (not shown),
A fluid path communicating with the pipe fitting 27, that is, fluid path 2
4, annular fluid path 15, annular communication path 21, fluid path 1
8 and the fluid path 63 supply air for operating a device (for example, a clamp device) attached to the rotating body 62. In addition, the pipe joint 28 is connected to the pipe 5.
9 is connected to a cooling water source (not shown) and communicates with the pipe joint 28, that is, the fluid path 25, the annular fluid path 16, the annular communication path 22, the fluid path 19, and the fluid provided in the rotating body 62. Cooling water for cooling a device (for example, a welding gun unit) attached to the rotating body 62 is supplied from a passage (not shown). The pipe fitting 29 is connected to a drain pipe (not shown), and is provided in a fluid path communicating with the pipe fitting 29, that is, a fluid path 26, an annular fluid path 17, an annular communication path 23, a fluid path 20, and a rotating body 62. The cooling water after cooling the device is drained from the fluid path (not shown).

(Advantages of the Invention) As explained above, according to the invention, the grease groove that lubricates the sliding surface between the main body and the rotating shaft is provided on the outside of the seal member, so that the frictional resistance between the seal member and the rotating shaft can be extremely reduced, and therefore the life of the seal member can be significantly extended compared to the conventional method, and the replacement cycle of the seal member can be extended. Even if the seal member is worn out and fluid leaks from the seal member, the leaked fluid can be reliably prevented from leaking to the outside by the grease injected into the grease groove.

In addition, by connecting the mounting shaft to the axis of the rotating body, the axes of the rotating body and the rotating shaft can be easily aligned, and even when installing a fluid supply device with considerable weight, it can be done in a short time. Can be installed very easily in no time.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a left side view of FIG. 1, and FIG. 3 is a right side view of FIG. 1. DESCRIPTION OF SYMBOLS 1... Fluid supply device, 2... Main body, 3... Through hole, 4... Rotating shaft, 8... Through hole, 15, 16,
17... Annular fluid path, 18, 19, 20... Fluid path, 24, 25, 26... Fluid path, 30, 31,
32, 33, 34, 35...O ring, 36, 3
7, 38, 39... Grease groove, 44... Mounting shaft.

Claims (1)

[Scope of utility model registration request] An annular fluid path is constituted by a position fixing main body having a through hole extending in the axial direction and a rotating shaft rotatably fitted into the through hole of the main body, and the rotating shaft includes:
A first fluid path communicating with the annular fluid path is provided, and a second fluid path communicating with the annular fluid path is provided in the main body, and the annular fluid path is provided between the main body and the rotating body. A sealing member is interposed to prevent fluid leakage from the rotating shaft, and a grease groove is provided on the outside of the sealing member to lubricate the sliding surface between the main body and the rotating shaft, and the groove is bored at the axis of the rotating shaft. A fluid supply device characterized in that a mounting shaft is fitted into a through hole.