JPH08128534A - Sealing device and manufacture thereof - Google Patents

Abstract

PURPOSE: To improve seal property, facilitate its production and further facilitate threading in a die at the time of threading, in a seal main body in a compound type of a seal lip made of resin with a rubber shape elastic body. CONSTITUTION: A seal up device is provided with a ring shaped seal main body 7 fixed a seal lip 4 made of resin to a reinforced ring 6 through a rubber shape elastic body 5 and a sleeve 8 assembled inside the seal main body 7, to whose outer periphery the seal lip 4 made of resin is sealed and contacted slidably. Accordingly, the rubber shape elastic body 5 is sealed and contacted to the outer periphery surface of the sleeve 4 slidably by the tip part 9 of the rubber shape elastic body 52 beyond the lip tip of the seal lip 4 made of resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary sealing device for use in, for example, an engine, a transmission, etc., and more particularly to a sealing in which a seal body and a sleeve of a composite seal type of a resin seal lip and a rubber-like elastic body are combined. The present invention relates to a device and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a rotary sealing device, for example, there is a sealing device as shown in FIG.

This sealing device 100 includes a reinforcing ring 1 having an L-shaped cross section, which has an inward flange portion 101A that is radially inward.
01, a rubber-like elastic body 102 is baked and fixed on almost the entire surface, and the inward flange portion 101 of the reinforcing ring 101 is fixed.
A resin seal lip 103 is fixed to the inner end of A via a rubber-like elastic body 102.

Further, the resin seal lip 103 has a conical truncated cone shape and has a thread groove 104 formed on its inner surface.
The thread groove 104 provides an effect of pumping action.

However, the resin-made seal lip 103 alone has problems such as insufficient followability due to insufficient elasticity and leakage of the sealing fluid from the minute gap. Therefore, as shown in FIG. 14, there is a compound seal type sealing device 200 in which a rubber-like elastic body is provided on the back surface side of the resin seal lip, that is, the surface of the sealing fluid side O, which compensates for the defects of only the resin seal lip. .

The sealing device 200 includes a housing 201.
It seals between the rotary shaft 202 and the rotary shaft 202, and is configured as follows.

A rubber-like elastic body 204 is baked and fixed on the entire surface of a reinforcing ring 203 having an L-shaped cross section having a radially inwardly facing flange portion 203A, and a rubber-like elastic member on the outer peripheral surface side of the cylindrical portion 203B of the reinforcing ring 203. The outer peripheral surface of the elastic body 204 is brought into sealing contact with the inner peripheral surface of the housing 201 so that the sealing device 20
The outer peripheral side of 0 is sealed.

In addition, the inward flange portion 2 of the reinforcing ring 203
At the inner end of 03A, a rubber-like elastic body lip 205 is provided which extends to the sealed fluid side O continuously with the rubber-like elastic body 204 and inclines toward the rotary shaft 202 side. A resin seal lip 206 is attached to almost the entire surface of the rubber-like elastic lip 205 on the atmosphere side A to form a composite seal type seal body 207.

Further, in this conventional example, a composite seal type seal body 207 including a rubber elastic lip 205 and a resin seal lip 206 is combined with a sleeve 208 which rotates together with the rotary shaft 202. .

The sleeve 208 has an L-shaped cross section having an outwardly facing flange portion 208A, and its inner peripheral surface is attached to the outer peripheral surface of the rotary shaft 202. On the other hand, the tip of the resin seal lip 206 is slidably and sealingly contacted with the outer peripheral surface. Further, the rear end side of the resin seal lip 206 is held by the end surface of the outward flange portion 208A on the sealed fluid side O.

Next, an example of a method of manufacturing a composite seal type seal body in which the rubber-like elastic lip and the resin seal lip are assembled will be described with reference to FIG. In this manufacturing method, a seal main body in which the lip tip portion of the rubber-like elastic lip 301 extends axially from the lip tip portion of the resin seal lip 302 will be described.

First, the molds 500, 501, 502, 50
A resin-made seal lip 302 is disposed in a molding cavity 507 of a molding die 506 composed of 3,504, 505, and a reinforcing ring 303 having an L-shaped cross section is applied to an end surface of the resin-made seal lip 302 on the sealed fluid side. The rubber cloth provided on the sealing fluid side of the resin-made seal lip 302 is vulcanized to form the rubber-like elastic lip 301. At this time, the rubber elastic lip 301 and the resin seal lip 302 are joined (see FIG. 15A).

After that, as shown in FIG. 15B, the upper molds 501 and 502 are opened (in the direction of the arrow in the drawing) to expose the rubber-like elastic body lip 301 and the resin seal lip 302. Then, as shown in FIG. 15C, the mold 503 with which the lip tip of the resin seal lip 302 is in contact.
Is pushed up in the direction of the arrow in the drawing and the tip of the lip is bent so as to be adjacent to the waist of the rubber-like elastic lip 301.

Then, the mold 504 with which the outer peripheral portion of the resin seal lip 302 is in contact is pushed up in the direction of the arrow in the drawing, and is joined through the reinforcing ring 303 to the resin seal lip 302 and the rubber-like elastic lip 301. Is discharged from the mold (see FIG. 15D). As a result, a composite seal type seal body 304 in which the rubber elastic lip 301 and the resin seal lip 302 are assembled is molded.

Next, a method of combining the seal main body 207 of the composite seal type shown in FIG. 14 with the sleeve 208 will be described with reference to FIGS.

First, a step portion 208C is formed at the tip of the cylindrical portion 208B of the sleeve 208 on the side of the sealed fluid, and an assembly jig 600 having a projecting portion 600A that engages with the step portion 208C is prepared.

In this assembly jig 600, when the projecting portion 600A is engaged with the step portion 208C of the sleeve 208, the outer peripheral surface thereof is substantially flush with the outer peripheral surface of the cylindrical portion 208B of the sleeve 208. , Its protrusion 600A
Has a taper surface 600B that gradually decreases in diameter.

Then, as shown in FIG.
0 protrusion part 600A to step part 208C of sleeve 208
Engages. After that, the resin seal lip 206 of the seal body 207 is bent along with the rubber-like elastic lip 205 along the tapered surface 600B of the assembly jig 600, moved in the direction of the arrow in the drawing, and assembled as shown in FIG. That is, the resin seal lip 206 is bent after the seal body 207 is molded by the assembly jig 600.

After that, the caulking jig 601 shown in FIG. 17 is moved in the direction of the arrow in the drawing to move the step portion 208 of the sleeve 208.
As shown in FIG. 18, the step portion 208C of the sleeve 208 is swaged by the swaging surface 601A of the swaging jig 601 to position the seal body 207. This completes the assembly.

[0020]

However, in the seal body of the composite seal type of the rubber-like elastic body lip and the resin seal lip according to the above-mentioned prior art, as shown in FIG.
At the time of molding as shown in FIG. 16 or after molding as shown in FIGS. 16 to 18, the resin seal lips 302, 20 are formed.
Bending of No. 6 is required, increasing the number of steps.

Further, as shown in FIG. 15, a resin seal lip 30 is formed on the rubber-like elastic lip 301 side while molding.
In order to bend 2, the interface of the composite seal type resin seal lip 302, the so-called rubber-like elastic lip 30
It is difficult to determine the position of the rubber-like elastic body lip 301 with respect to one side surface, and it is difficult to position the resin seal lip 302 and the rubber-like elastic body lip 301 with respect to the outer peripheral surface of the sleeve.

As described above, since it is difficult to position the resin seal lip 302 and the rubber-like elastic body lip 301, the sealing performance tends to be unstable. Further, in the case of the sealing device 200 shown in FIG. 14, a resin seal lip 206
The rubber-like elastic lip 205 is provided on the back side of the, but since the sliding surface side of the sleeve 208 with the outer peripheral surface of the cylindrical portion 208B is only the resin seal lip 206,
Poor static sealing may cause leakage of sealing fluid.

A composite seal type seal body 20 is also provided.
In FIGS. 7 and 304, when the resin seal lip is provided with a thread groove as shown in FIG. 13, a step of preforming and cutting the thread groove portion is further required, which requires a large number of steps.

Further, when the thread groove is formed on the resin seal lip, the resin seal lip 10 is formed as shown in FIG.
If 3 is a truncated cone, when the thread groove 104 is machined, the thread groove will be machined on the taper surface of the corresponding die, which makes the thread machining difficult.

Then, in the sealing fluid 200 shown in FIG. 14, a composite seal type seal body 2 composed of a rubber-like elastic lip 205 and a resin seal lip 206 is used.
When the sleeve 208 is combined with 07, assembling jig 600 and caulking jig 601 as shown in FIGS.
Since it is necessary, and the step portion 208C of the sleeve 208 is caulked, it is difficult to disassemble after disassembling it for some reason after assembly.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to provide a seal main body of a composite seal type of a resin seal lip and a rubber-like elastic body. It is an object of the present invention to provide a sealing device and a manufacturing method thereof, which can improve the manufacturing cost, facilitate manufacturing, and facilitate thread groove processing in a mold when forming a thread groove.

[0027]

In order to achieve the above object, in the present invention, an annular seal main body in which a resin seal lip is fixed to a reinforcing ring via a rubber-like elastic body,
A sealing device comprising: a sleeve that is assembled inside the seal body and has an outer periphery on which the resin seal lip slidably sealingly contacts, the rubber-like elastic body being passed over a lip end of the resin seal lip. And the tip of the rubber-like elastic body is slidably and sealingly contacted with the outer peripheral surface of the sleeve.

Further, it is preferable that a smooth projection is provided at the end portion of the sleeve on the sealed fluid side, or a thread groove is provided on at least one sliding surface of the resin seal lip and the rubber-like elastic body.

As a method of manufacturing the sealing device, one side of a flat washer-shaped resin material is covered with a rubber-like elastic body to form an intermediate body of the seal body, and the resin material covered with the rubber-like elastic body is formed. A sleeve is inserted into the inner peripheral portion of the resin, and the inner diameter of the resin material is spread by the sleeve and bent into a lip to form a resin seal lip covered with a rubber-like elastic body, and at the same time, the seal body and the sleeve are combined. It is characterized by that.

Further, a thread groove is formed on the sliding surface of at least one of the flat washer-shaped resin material and the rubber-like elastic body coated on one surface of the resin material, or the end of the sleeve on the sealed fluid side. It is preferable to provide a smooth protrusion on the part.

[0031]

In the sealing device having the above construction, the rubber-like elastic body is moved beyond the lip tip of the resin seal lip so that the tip of the rubber-like elastic body slidably sealingly contacts the outer peripheral surface of the sleeve. Therefore, due to the rubber characteristics of the rubber-like elastic body, it is possible to supplement the drawbacks of the resin-made seal lip, such as scratches, delayed followability, and static sealability.

In particular, since the tip of the rubber-like elastic body is brought into sealing contact with the outer peripheral surface of the sleeve as described above, the static sealing performance can be improved.

Further, since the rubber-like elastic body is provided beyond the lip tip of the resin-made seal lip as described above, the sealing property in the seal body of the composite seal type of the resin-made seal lip and the rubber-like elastic body is provided. Can be improved.

Since the protrusion is provided at the end portion of the sleeve on the side of the sealed fluid, the annular seal body does not come off, and a sufficiently integrated assembled state can be maintained. Also, since the protrusion has a smooth shape, if it is disassembled for any reason, it can be pulled in the axial direction by applying force without damaging the surface of the resin seal lip and the rubber-like elastic body (sliding surface with the sleeve). For example, the seal body and the sleeve can be separated. Of course, also at the time of assembling, it can be assembled by inserting force in the axial direction without damaging the sliding surface of the resin seal lip and the sleeve of the rubber-like elastic body.

Further, by providing a thread groove on the sliding surface of at least one of the resin seal lip and the rubber-like elastic body, the pumping effect of the thread groove further improves the sealability. You can

In the method of manufacturing the above-mentioned sealing device, the intermediate body of the seal body in which one side of the flat washer-shaped resin material is covered with the rubber-like elastic body, that is, the intermediate body of the so-called flat washer-like seal body is By inserting the resin material into the resin material, the inner diameter portion of the resin material is expanded and bent into a lip shape to form a resin seal lip covered with the rubber-like elastic body, and at the same time, the seal body and the sleeve are combined. In this way, by simply inserting the intermediate body of the seal body into the sleeve without using the jig shown in the prior art, it is possible to bend and combine the resin seal lip covered with the rubber-like elastic body at the same time. It is easy and requires less man-hours.

Moreover, since the rubber-like elastic body is covered on one surface of the resin material, that is, the resin-like material is assembled into the sleeve, the resin-made seal lip and the rubber-like elastic body are positioned. Is unnecessary, and positioning can be performed easily with respect to the outer peripheral surface of each sleeve, so that the positioning is reliably performed. As a result, the sealing performance becomes stable.

Further, since the flat washer-shaped resin material and the rubber-like elastic body coated on one surface of the resin material are formed with the thread groove on the sliding surface with the sleeve, the flat surface in the molding die. Since the thread groove will be processed in
The thread groove processing becomes easy. Therefore, various kinds of thread groove patterns can be easily processed.

Furthermore, since a smooth protrusion is provided at the end of the sleeve on the side of the sealed fluid, the insertion of the sleeve as described above,
Assembling can be performed smoothly, and as described in the above-mentioned sealing device, the seal body can be maintained in a sufficiently integrated assembled state without coming off, and the surface of the resin seal lip and the rubber-like elastic body (with the sleeve) (Sliding surface)
It can be disassembled and reassembled without damaging the.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. First, a sealing device according to an embodiment of the present invention will be described with reference to FIGS.

Reference numeral 1 denotes a rotary sealing device for sealing between the housing 2 and the rotary shaft 3, and this sealing device 1
Is a seal component 7 as an annular seal body in which a PTFE lip 4 as a resin seal lip is fixed to a reinforcing ring 6 via a rubber-like elastic body 5, and is assembled inside the seal component 7 and has an outer periphery. And a sleeve component 8 which forms a sleeve with which the PTFE lip 4 slidably and sealingly contacts, and a rubber gasket portion 9 of a rubber-like elastic body is provided at the lip end of the PTFE lip 4, and the sleeve component 8 The R-shaped projection 10 as a smooth projection is provided at the end O of the sealed fluid.

The sleeve component 8 is attached to the outer peripheral surface of the rotary shaft 3 and rotates together with the rotary shaft 3.

The sleeve component 8 is composed of a sleeve 11 and a rubber-like elastic body 12, as shown in FIG.

The sleeve 11 is a cylindrical member having an L-shaped cross section having an outward flange portion 11A that is radially outward, and the outer peripheral surface of the cylindrical portion 11B has the lip tip of the PTFE lip 4 and the rubber gasket portion 9. The end surface is a lip sliding surface 11C that slidably and sealingly contacts. Then, at the tip of the cylindrical portion 11B, that is, at the sealed fluid side O,
A projection 10 is provided. The R-shaped projection 10 protrudes radially outward from the lip sliding surface 11C in an arcuate cross-section, and its end is an inward flange portion 10A bent inward in the radial direction.

Then, the outer peripheral surface of the outward flange portion 11A of the sleeve 11 and the A-side surface on the atmosphere side and the R-shaped projection 1 are formed.
The rubber-like elastic body 12 is integrally baked and fixed on the entire inner peripheral surface of the cylindrical portion 11B including the inner peripheral portion of 0.
The inner peripheral surface of the rubber-like elastic body 12A on the inner peripheral surface side of the cylindrical portion 11B of the rubber-like elastic body 12 is stepped, and the rubber-like elastic body 12A seals the rotary shaft 3. There is. Further, the outer peripheral surface of the rubber-like elastic body 12B on the outer peripheral surface side of the outward flange portion 11A is a flat surface, and has a flange portion 12C extending toward the atmospheric side A in the axial direction.

The ring-shaped seal part 6 has the P-shape as described above.
It is composed of a TFE lip 4, a rubber-like elastic body 5, and a reinforcing ring 6.

Before being assembled to the sleeve component 8, the PTFE lip 4 has a flat washer shape as shown in FIG.

The reinforcing ring 6 is a cylindrical member having an L-shaped cross section having an inward flange portion 61 that is radially inward. The outer peripheral end surface of the PTFE lip 4 is attached to the sealing fluid side O end surface of the inward flange portion 61 of the reinforcing ring 6, and the cylindrical portion 6 of the reinforcing ring 6 is provided.
With the outer peripheral surface of the PTFE lip 4 abutting on the inner peripheral surface of 2, the rubber-like elastic body 5 is integrally baked and fixed over substantially the entire surface of the reinforcing ring 6, whereby P
The TFE lip 4 is fixed to the reinforcing ring 6.

The outer peripheral surface of the rubber-like elastic body 51 on the outer peripheral surface side of the cylindrical portion 62 of the reinforcing ring 6 is stepped, and the outer peripheral surface is sealed by sealingly contacting the inner peripheral surface of the housing 2. Is. On the other hand, the rubber-like elastic body 52 on the inner peripheral surface side of the cylindrical portion 62 of the reinforcing ring 6 extends in a thin state along the back surface side of the PTFE lip 4, that is, the sealed fluid side O, and the tip thereof is PT.
It is provided beyond the tip of the FE lip 4, and the tip thereof is the rubber gasket portion 9.

The rubber gasket portion 9 has a substantially semicircular cross section, and its end surface is substantially flush with the front surface of the PTFE lip 4, that is, the end surface on the atmosphere side A.

As described above, the annular seal component 7 is
It is a composite seal type of the FE lip 4 and the rubber-like elastic body 5. The sealing device 1 according to this embodiment is formed by combining the annular sealing component 7 and the sleeve component 8.

Assembly will be described with reference to FIGS. 3 and 2.

In the annular seal component 7 before assembly, the lip portion 13 of the composite seal type including the PTFE lip 4 and the rubber gasket portion 9 including the thin rubber elastic body 52 has a flat washer shape. , The inner diameter of the flat washer-shaped lip portion 13 is equal to that of the PTFE lip 4
Since the rubber gasket portion 9 and the lip sliding surface 11C of the sleeve 11 of the sleeve component 8 must be slidably contacted with each other, the lip sliding surface 11 of the sleeve 11 can be slidably contacted.
The diameter is set smaller than the diameter of C.

The sleeve component 8 and the R-shaped projection 10 are attached to the annular seal component 7 having the flat washer-shaped lip portion 13.
3, the inner diameter portion of the lip portion 13 of the PTFE lip 4 including the rubber gasket portion 9 is expanded by inserting in the direction of the arrow in FIG. 3, and the lip portion 13 is bent as shown by the dotted line in FIG. In this bent state, by inserting the sleeve component 8 until the end face of the PTFE lip 4 contacts the end face of the outward flange portion 11A of the sleeve 11 and the end face of the rubber gasket portion 9, the seal component 7 and the sleeve component 8 are separated from each other. When combined, the sealing device 1 shown in FIG. 2 is obtained.

At this time, the lip tip of the PTFE lip 4 of the lip portion 13 and the end surface of the rubber gasket portion 9 are slidably and slidably contacted with and sealed to the lip sliding surface 11C of the sleeve 11. Further, the inner peripheral surface of the rubber-like elastic body 53 on the inner peripheral surface side of the inward flange portion 61 of the reinforcing ring 6 of the seal component 7 and the sleeve 11 of the rubber-like elastic body 12 of the sleeve component 8.
Rubber-like elastic body 1 on the outer peripheral surface side of the outward flange portion 11A of the
A clearance 14 is provided between the outer peripheral surface of 2B and the outer peripheral surface of the flange portion 12C. With this clearance 14, a labyrinth structure can be formed, and dust clearance can be improved by minimizing the clearance 14. .

Since the rubber gasket portion 9 seals, a tightening force is required. Therefore, in this embodiment, the volume is set to have a semicircular cross section in order to obtain a suitable tightening force.

In the sealing device 1 configured as described above, as shown in FIG. 1, the outer peripheral surface of the rubber-like elastic body 51 of the seal part 7 is the inner peripheral surface of the housing 2, and the rubber-like elastic part of the sleeve part 8 is. The inner peripheral surface of the body 12A is closely attached to the outer peripheral surface of the rotary shaft 3, and a lip portion 13 seals the fluid on the sealed fluid side O so as not to leak to the atmosphere side A.

In the sealing device having the above construction, the seal component 7 is provided beyond the PTFE lip 4 and the thin rubber elastic body 52 closely attached to the back side of the PTFE lip 4 and the lip tip of the PTFE lip 4. Rubber gasket part 9
Since it is a composite seal type consisting of, the PTFE lip 4 provides low friction, low friction, oil resistance when the sealing fluid is oil, and the rubber gasket portion 9
Due to the rubber characteristics of the above, it is possible to supplement the flaws of the PTFE lip 4, the delay of followability, and the static sealability. In particular, the rubber gasket portion 9 is attached to the lip sliding surface 11 of the sleeve 11.
Since it is in sealing contact with C, the static sealing performance can be improved.

As described above, the good sealability can be maintained in the composite seal type seal component 7.

Since the R-shaped projection 10 is provided at the end of the sleeve 11 on the sealed fluid side 0, the annular seal component 7 does not come off, and a sufficiently integrated assembled state can be maintained. In addition, since the R-shaped projection 10 has a smooth shape, if it is disassembled for any reason, the seal part 7 and the sleeve part 8 can be separated by pulling in an axial direction with a high load without damaging the sliding surface of the lip part 13. can do. Of course, also at the time of assembling, the sliding surface of the lip portion 13 can be similarly assembled by applying force and inserting it in the axial direction without damaging the sliding surface.

In the present embodiment, the lip portion 1
A spiral unidirectional screw groove is formed on the sliding surface of the third sleeve 11 with the lip sliding surface 11C. The thread groove will be described with reference to FIG. 5. Thread grooves 15 and 16 are formed on the end surface of the PTFE lip 4 and the end surface of the rubber gasket portion 9, respectively. The thread groove 15 of the PTFE lip 4 is formed from the lip tip to the vicinity of the inner peripheral surface of the inward flange portion 61 of the reinforcing ring 6, and the thread groove 16 of the rubber gasket portion 9 is formed over the entire length.
Incidentally, the thread groove 15 of the PTFE lip 4 has a larger inclination angle in consideration of flexibility.

In this way, the thread groove 15, the thread groove 15, are formed on the sliding surfaces of the PTFE lip 4 of the lip portion 13 and the rubber gasket portion 9.
Since 16 is provided, good sealing performance due to the pumping action can be maintained for a long period of time.

Therefore, the thread groove 1 of the lip portion 13 is shown in FIG.
5 and 16 show other modes. In the figure, a indicates the range from the lip tip to the vicinity of the inner peripheral surface of the inward flange portion 61 of the reinforcing ring 6 on the sliding surface of the PTFE lip 4, and b indicates the sliding of the rubber gasket portion 9 described above. The range of the total length is shown in the plane, and the aspects of the screw grooves 15 and 16 will be described below with reference to symbols a and b.

Thread groove 15 and b of a shown in FIG. 6 (b)
The thread groove 16 is the same as that described above and is a one-way rotation thread groove (the example of the right-hand thread is shown).

The thread groove 15 of a shown in FIG. 6 (c) is a parallel groove to improve the flexibility and followability of the PTFE lip 4. Further, the thread groove 16 of b is a thread groove for bidirectional rotation.

The thread groove 16 of b shown in FIG. 6 (d) is the same as the thread groove b of FIG. 6 (c) and is for bidirectional rotation. Further, the thread groove 15 of a has flexibility in the outer peripheral portion,
Parallel grooves are formed in order to improve the followability, and the inner peripheral portion is a petal shape which is continuous with the bidirectional rotation thread groove 16 of b as a bidirectional rotation thread groove.

Although the thread groove is formed on both the PTFE lip 4 and the rubber gasket portion 9 in this embodiment including the above-described various modes, the effect may be weakened, but the thread groove is provided on at least one side. The shape of the thread groove may be other than the above.

Next, as a method of manufacturing the sealing device according to the embodiment of the present invention, a method of manufacturing the sealing device 1 will be described.

Briefly described above, the seal component 7 having the flat washer-shaped lip portion 13 as the intermediate body of the seal body and the sleeve component 8 forming the sleeve are molded,
As described above, the sealing device 1 is manufactured by inserting the sleeve component 8 into the inner peripheral portion of the lip portion 13 of the seal component 7 and combining them.

First, the molding of the seal component 7 having the flat washer-shaped lip portion 13 will be described with reference to FIGS.

The sealing component 7 is molded in the molding cavity 21 of the molding die 20. The molding die 20 is composed of an upper die 22 and a lower die 23.

The lower mold 23 is provided with a reinforcing ring 6, a flat washer-shaped PTFE sheet 24 as a resin material, and a rubber material 25 placed on one side thereof, and is arranged in the radial direction. On the other hand, it is a split type of the first lower mold 23A and the second lower mold 23B.

The first lower mold 23A has a flat surface portion 26 on which the PTFE sheet 24 is placed, and a step portion 27 on which the inward flange portion 61 of the reinforcing ring 6 is placed on the outer peripheral portion thereof.
have. The step portion 27 is an inward flange portion 61.
Is set so that the upper end surface in the figure is substantially flush with the flat surface portion 26 when is mounted.

The second lower mold 23B has a cylindrical portion 62 of the reinforcing ring 6.
And a peripheral wall 28 around which the rubber material 25 wraps.

Then, the first lower mold 23A and the second lower mold 2
3B are matched with each other to form the lower mold 23, the cylindrical portion 62 of the reinforcing ring 6 is placed on the peripheral wall 28 side of the second lower mold 23B, and the inward flange portion 61 is placed on the step portion 27 of the first lower mold 23A. Next, the PTFE sheet 24 having a predetermined width is placed on the first lower mold 2 so that the outer peripheral surface thereof contacts the inner peripheral surface of the cylindrical portion 62 of the reinforcing ring 6.
It is placed on the flat portion 26 of 3A. A desired rubber material 25 is placed on the outer peripheral side of the PTFE 24.

On the other hand, the upper die 22 has a convex portion 22A substantially in the center in the radial direction, and the end face of the convex portion 22A and the flat portion 26 of the first lower die 23A form a flat washer-shaped lip portion 1.
3 is formed, and a concave portion 22B having a semicircular cross section for forming the rubber gasket portion 9 is provided radially inward of the inner diameter of the PTFE sheet 24 on the end surface of the convex portion 22A.

As shown in FIG. 8, the upper mold 22 having the above-described structure is heated and pressed against the lower mold 23 to which the components are supplied as described above. An intermediate of is formed. At this time, P
A rubber-like elastic body 52 is coated on one surface of the TFE sheet 24, and a rubber gasket portion 9 having a semicircular cross-section is formed at the inner diameter end of the recess 22B of the upper mold 22 beyond the inner diameter end portion of the PTFE sheet 24. .

In this way, since the PTFE sheet 24 and the rubber material 25 are bonded on the flat surface portion 26, stable molding can be performed without causing misalignment or burrs.

By cutting the inner and outer diameter sides of the intermediate part of the seal part 7 along the two-dot chain line in FIG. 8, the PTFE lip 4 and the thin rubber elastic body 52 shown in FIG.
The composite seal type seal component 7 including the rubber gasket portion 9 is completed.

Next, regarding the molding of the sleeve component 8, FIG.
This will be described with reference to FIG. That is, in the pressing process of the sleeve 11, the cross-section is L-shaped having the outward flange portion 11A. At the time of this pressing step, the R-shaped projection 10 is formed at the end of the cylindrical portion 11B. Then, on the inner peripheral surface of the cylindrical portion 11B including the inner peripheral portion of the R-shaped projection 10 of the sleeve 11 and the outer end surface and outer peripheral surface of the outward flange portion 11A, for example, by a molding die not shown, The rubber-like elastic body 12 having the flange portion 12C is integrally and continuously baked and fixed to complete the sleeve component 8 shown in FIG.

Then, the sealing device 1 is completed by combining the sealing component 7 and the sleeve component 8 molded as described above. Therefore, the assembly of the seal component 7 and the sleeve component 8 will be described with reference to FIG.

First, in the seal part 7, the PTFE lip 4 and the rubber gasket part 9 can slidably contact the inside of the flat washer-shaped composite seal type lip part 13 with the lip sliding surface 11C of the sleeve 11 of the sleeve part 8. Therefore, the diameter is set to be smaller than the inner diameter of the lip sliding surface 11C.

Immediately after the seal component 7 is vulcanized and molded (primary vulcanization) as described above, the sleeve component 8 is inserted in the direction of the arrow in FIG. By inserting in this way, the R-shaped projection 10 of the sleeve component 8 abuts on the PTFE lip 4, and by further inserting, the inner diameter of the lip portion 13 is expanded, and the lip portion 13 has a lip shape as shown by the dotted line in FIG. Can be bent into. In this bent state, by inserting the sleeve component 8 until the end face of the PTFE lip 4 and the end face of the rubber gasket portion 9 come into contact with the end face of the outward flange portion 11A of the sleeve 11, the seal component 7 and the sleeve component 8 are separated from each other. After assembly, the assembly is heated (secondary vulcanization) to complete the bending of the lip portion 13 (see the dotted line in FIG. 9).
This completes the manufacture of the sealing device 1.

Even after the seal component 7 is cooled,
The sleeve component 8 can be inserted, but it is slightly stiff and requires force.
On the other hand, when heated or in a warm state immediately after primary vulcanization, since the modulus is considerably low, the sleeve component 8 can be easily inserted.

Further, in the bending of the lip portion 13, the thickness of the rubber-like elastic body 52 which is in close contact with the back surface side of the PTFE lip 4 has an influence, so that the bending of the lip portion 13 can be facilitated. It is desirable to minimize the thickness of the rubber-like elastic body 52.

As described above, by simply inserting the sleeve part 8 into the seal part 7 without using an assembly jig or the like, the lip part 13 can be bent and combined at the same time, so that the manufacturing is easy and the man-hours are reduced. It can be small. Further, in the prior art, the end of the sleeve was crimped, but in the present embodiment, the R-shaped projection 10 has already been pressed in the step of pressing the sleeve 11, so that nothing needs to be done after assembly. Since it is good, the caulking jig shown in the prior art need not be used.

Further, since the end portion of the sleeve 11 of the sleeve component 8 is the R-shaped protrusion 10, the sliding surface of the lip portion 13 of the seal component 7 is not damaged (damaged or the like) and the lip portion 13 is not damaged. Can be bent and assembled, and the sealing component 7 can be maintained in a sufficiently integrated state without coming off. The R-shaped projection 10 is smooth when necessary, so that the sliding surface of the lip portion 13 It can be removed and disassembled by pulling it out with a high load without damaging it, and it can be reused by inserting it.

Further, since the rubber lip 52 and the rubber gasket portion 9 are covered on one surface of the PTFE lip 4, that is, the PTFE lip 4 is assembled into the sleeve component 8 in an integrated state, the PTFE lip 4 is assembled. 4 and the rubber-like elastic body 52 and the rubber gasket portion 9 are not required to be positioned, and the respective sleeve parts 8 can be easily positioned to the lip sliding surface 11C of the sleeve 11, so that the positioning can be performed reliably. Be done. As a result, the sealing performance becomes stable.

Then, the PTFE lip 4 and the rubber gasket portion 9 of the lip portion 13 of the sealing component 7 of the sealing device 1 are provided.
Since the thread grooves 15 and 16 are formed in, the molding of the thread grooves 15 and 16 will be described below.

The PTFE lip 4 and the rubber gasket portion 9 of the seal part 7 are made of the flat washer-shaped PTFE sheet 24 and the PTFE sheet 24 of the flat portion 26 of the first lower mold 23A on which the rubber material 25 is placed as described above. A convex screw protrusion 29 is provided on the mounting portion and a concave screw recess 30 is provided at the position of the rubber gasket portion 9.

When the rubber material 25 is vulcanized and molded, the screw projections 29 are transferred to the surface of the PTFE sheet 24 by the rubber molding pressure to form the thread groove 15, and the rubber material 25 is formed.
Flowing into the concave portion 22B of the upper die 22 and the threaded concave portion 30 of the flat surface portion 26 of the first lower die 23A in the molding die 20, the thread groove 16 is molded in the rubber gasket portion 9.

As described above, the thread grooves 15,
Since 16 is formed, stable molding can be performed without causing misalignment or burrs.

In addition, the flat surface portion 2 is also used for thread groove processing.
6, ie screw projection 29 or screw recess 30 on a flat surface
Since it is processed, thread groove processing is easy. Therefore, the patterns of the various thread grooves 15 and 16 shown in FIG. 6 can be easily processed.

10 and 11 show a sealing device according to the second and third embodiments of the present invention. The second and third embodiments are the same as the first embodiment, except that the clearance 14 is The labyrinth structure of the part is improved to improve the labyrinth effect.

That is, the flange portion 12C of the rubber-like elastic body 12 of the sleeve component 8 is provided with a step having a smaller diameter than the outer peripheral surface of the rubber-like elastic body 12B, and in the second embodiment, the radially inward flange portion 31A is provided. The assembly ring 31 having an L-shaped cross section is assembled on the atmosphere side A of the seal component 7, and a clearance 14A is further provided between the tip of the inward flange portion 31A and the outer peripheral surface of the flange portion 12C of the rubber-like elastic body 12.
Is formed.

On the other hand, in the third embodiment, the tip of the inward flange portion 31A of the assembly ring 31 of the second embodiment is attached to the outer peripheral surface of the flange portion 12C of the rubber-like elastic body 12 and the atmosphere side A.
As an assembly ring 31 'having a shape that extends along the end face with a minute gap, a clearance 14B is formed between the part of the assembly ring 31' and the outer peripheral surface of the flange portion 12C and the end surface on the atmosphere side A. is there.

Since the other configurations and operations of the sealing devices of the second and third embodiments are the same as those of the first embodiment, the same components are designated by the same reference numerals and their description is omitted. To do.

FIG. 12 shows a sealing device according to a fourth embodiment of the present invention. In this embodiment, the sleeve component 8 is a sleeve 11 'of a single metal ring and the fixing force of the sleeve component 8 is improved. The heat conductivity to the rotating shaft 3 is improved. Since other configurations and operations are the same as those of the above-described respective embodiments, the same reference numerals are given to the same components and the description thereof will be omitted.

[0099]

As described above, according to the present invention, in the sealing device having the above structure, the rubber-like elastic body is passed over the lip tip of the resin seal lip, and the tip of the rubber-like elastic body is the outer periphery of the sleeve. Since it is slidably and slidably in contact with the surface, the rubber characteristics of the rubber-like elastic body can supplement the flaws, delay in tracking, and static sealing which are the drawbacks of the resin seal lip.

Particularly, since the tip of the rubber-like elastic body is brought into sealing contact with the outer peripheral surface of the sleeve as described above, the static sealing performance can be improved.

Since the rubber-like elastic body is provided beyond the lip tip of the resin-made seal lip as described above, the sealing performance of the seal body of the composite seal type of the resin-made seal lip and the rubber-like elastic body is improved. Can be improved.

Since the projection is provided at the end portion of the sleeve on the side of the sealed fluid, the annular seal body does not come off, and a sufficiently integrated assembled state can be maintained. In addition, since the protrusion has a smooth shape, if it is disassembled for any reason, the seal main body can be pulled in the axial direction by applying force without damaging the sliding surface of the resin seal lip and the sleeve of the rubber-like elastic body. And the sleeve can be separated. Of course, also at the time of assembling, it can be assembled by inserting force in the axial direction without damaging the sliding surface of the resin seal lip and the sleeve of the rubber-like elastic body.

Further, by providing a thread groove on the sliding surface of at least one of the resin-made seal lip and the rubber-like elastic body, the pumping effect of the thread groove further improves the sealing performance. You can

In the method of manufacturing the sealing device, the intermediate body of the seal body in which one side of the flat washer-like resin material is covered with the rubber-like elastic body, that is, the intermediate body of the so-called flat washer-like body is used as the sleeve. By inserting the resin material into the resin material, the inner diameter portion of the resin material is expanded and bent into a lip shape to form a resin seal lip covered with the rubber-like elastic body, and at the same time, the seal body and the sleeve are combined. In this way, by simply inserting the intermediate body of the seal body into the sleeve without using the jig shown in the prior art, it is possible to simultaneously perform bending and combination of the resin seal lip covered with the rubber-like elastic body. It is easy and requires less man-hours.

Further, since the rubber-like elastic body is coated on one surface of the resin material, that is, the rubber-like elastic body is integrated with the sleeve, the resin-made seal lip and the rubber-like elastic body are positioned. Is unnecessary, and the positioning with respect to the outer peripheral surface of each sleeve can be easily performed, whereby the positioning is surely performed. As a result, the sealing performance becomes stable.

Further, since the flat washer-shaped resin material and the rubber-like elastic body coated on one surface of the resin material are formed with the thread groove on the sliding surface with the sleeve, the flat surface is formed in the molding die. Since the thread groove is processed, the thread groove processing becomes easy. Therefore, various kinds of thread groove patterns can be easily processed.

Further, since the smooth projection is provided at the end portion of the sleeve on the side of the sealed fluid, the insertion of the sleeve as described above,
Assembling is smooth, and as described in the above-mentioned sealing device, the seal body can be maintained in a fully integrated state without coming off, and sliding with the resin seal lip and the rubber-like elastic sleeve. It can be disassembled and reassembled without damaging the surface.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mounting state of a sealing device according to a first embodiment of the present invention.

FIG. 2 is a half cross-sectional view of the sealing device according to the first embodiment of the present invention.

FIG. 3 is a half sectional view showing an assembling process of a seal part and a sleeve part.

FIG. 4 is a half sectional view of a sleeve component.

FIG. 5 (a) is a half sectional view for explaining a thread groove state of the seal component, and FIG. 5 (b) is an enlarged view of a main part of FIG. 5 (a).

FIG. 6 (a) is a half cross-sectional view of a seal component, and FIGS. 6 (b) to (d) are plan views showing various thread groove configurations.

FIG. 7 shows a method of manufacturing a sealing device according to a first embodiment of the present invention, and is a half cross-sectional view showing a state of supplying components before pressurizing a molding die in molding a sealing component.

FIG. 8 is a half cross-sectional view showing a molded (pressurized) state of the seal part.

FIG. 9 is a half cross-sectional view showing the seal component after molding.

FIG. 10 is a half sectional view of a sealing device according to a second embodiment of the present invention.

FIG. 11 is a half sectional view of a sealing device according to a third embodiment of the present invention.

FIG. 12 is a half sectional view of a sealing device according to a fourth embodiment of the present invention.

FIG. 13 is a half cross-sectional view of a conventional sealing device.

FIG. 14 is a cross-sectional view of a conventional sealing device.

FIG. 15 shows a method of manufacturing a seal body of a conventional sealing device, and FIG. 15 (a) is a cross-sectional view of an essential part of a step of joining a rubber elastic lip and a resin seal lip,
The figure (b) is a sectional view of the main part of the opening process of the upper mold, the figure (c) is a sectional view of the main part of the bending step of the resin seal lip, and the figure (d) is the ejection of the molded product. It is a principal part sectional drawing of a process.

FIG. 16 is a cross-sectional view showing a step of inserting a seal main body into a sleeve in a conventional method for manufacturing a sealing device.

FIG. 17 is a cross-sectional view showing the state after the insertion step of FIG. 16 but before the crimping.

FIG. 18 is a cross-sectional view showing a caulking process.

[Explanation of symbols]

 1 Sealing Device 2 Housing 3 Rotating Shaft 4 PTFE Lip (Resin Seal Lip) 5, 51, 52, 53 Rubber Elastic Body 6 Reinforcement Ring 61 Inward Flange Part 62 Cylindrical Part 7 Seal Part (Seal Body) 8 Sleeve Part 9 Rubber gasket part 10 R-shaped protrusion (smooth protrusion) 11, 11 'Sleeve 11A Outward flange part 11B Cylindrical part 11C Lip sliding surface 12, 12A, 12B Rubber-like elastic body 12C Flange part 13 Lip part 14, 14A, 14B Clearance 15 16 Screw groove 20 Mold 21 Mold cavity 22 Upper mold 22A Convex part 22B Recessed part 23 Lower mold 23A First lower mold 23B Second lower mold 24 PTFE sheet (resin material) 25 Rubber material 26 Flat part 27 Step part 28 Peripheral wall 29 Screw projection 30 Screw recess 31, 31 'Assembly ring 31A Inward Flange

Claims (6)

[Claims] 1. A ring-shaped seal body in which a resin seal lip is fixed to a reinforcing ring via a rubber-like elastic body, and the resin-made seal lip is slidably mounted on the inner periphery of the seal body. And a sleeve in sealing contact, wherein the rubber-like elastic body is slidably and sealingly contacted with the outer peripheral surface of the sleeve so that the tip of the rubber-like elastic body crosses over the lip tip of the resin seal lip. A sealing device characterized in that 2. The sealing device according to claim 1, wherein a smooth projection is provided at an end of the sleeve on the side of the sealed fluid. 3. The sealing device according to claim 1, wherein a thread groove is provided on at least one sliding surface of the resin seal lip and the rubber-like elastic body. 4. A flat washer-shaped resin material is coated on one side with a rubber-like elastic body to form an intermediate body of a seal body, and a sleeve is inserted into the inner peripheral portion of the resin material covered with the rubber-like elastic body. A sealing device comprising a sleeve and a sleeve, wherein an inner diameter portion of the resin material is spread by the sleeve and bent into a lip shape to form a resin seal lip covered with a rubber-like elastic body, and at the same time, a seal body and a sleeve are combined. Manufacturing method. 5. A thread groove is formed on a sliding surface of at least one of a flat washer-shaped resin material and a rubber-like elastic body coated on one surface of the resin material with a sleeve. A method for manufacturing the sealing device according to. 6. The method for manufacturing a sealing device according to claim 4, wherein a smooth protrusion is provided on an end portion of the sleeve on the side of the sealing fluid.