JPH07301340A - Retainer integral type seal device and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a retainer integral type seal device of structure capable of firmly fixing a seal member and a retainer and to provide a method of manufacturing this retainer integral type seal device, in an integrally formed molded product of the resin-made seal member and the resin-made retainer. CONSTITUTION:In a retainer integral type seal device integrally forming a resin-made annular seal member 2 and a resin-made retainer 3 of supporting a diametric direction one end of the seal member 2 by insert molding in the case of die molding the retainer 3, a seal member fixing part 8, fixed so as to press in obverse/reverse both side surfaces of the seal member 2, is provided in the retainer 3. In this seal member fixing part 8, an opening part 20, where any one side surface of the obverse/reverse side surface) of the seal member 2 is partly exposed, is provided, and in an exposed surface part of the seal member 2 exposed in this opening part 20, an engaging part 21, irregularity- engaged with each other between itself and a resin part of the seal member fixing part 8 in an opposite side to a side provided with the opening part 20, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for sealing the end portion of a crankshaft of an automobile engine, and more particularly to a retainer-integrated sealing device in which a retainer and a seal member are integrally formed, and a method of manufacturing the same. .

[0002]

2. Description of the Related Art As a conventional seal for a crankshaft end of an automobile engine of this type, a retainer and a seal member are manufactured separately and then assembled to form an assembly (for example, Japanese Utility Model No. 3). 18681 gazette).

However, in order to manufacture each of the retainer and the seal member, a manufacturing process and an assembling process for both are required, and the number of processes is large and there is a limit to cost reduction.

Therefore, various techniques for integrally molding the retainer and the seal member have been proposed in order to further reduce the cost. For example, in Japanese Utility Model Publication No. 3-13681,
A technique is disclosed in which a rubber oil seal and a gasket are integrally formed by vulcanization on a retainer made of sheet metal.

By the way, in recent years, in the field of automobiles, a shift to resin parts has been made in order to further reduce the weight.
Resin retainers are also being considered for commercialization. On the other hand, as for the seal member itself, since the rubber seal member has poor durability, use of a resin seal member such as PTFE (tetrafluoroethylene resin) is being studied.

Therefore, it is conceivable to insert and mold a resin sealing member when molding the retainer.

As a technique for integrally molding such a resin seal member and a resin retainer, for example, Japanese Patent Laid-Open No.
There is one described in Japanese Patent Publication No. 1-167779. The one described in this publication integrally molds a resin retainer into a resin-made annular seal member formed in a washer shape.

[0008]

However, in the case of the above-mentioned prior art, since the fluid resin material is only joined by the adhesive force when it adheres to the surface of the seal member during molding, the seal member and the retainer are joined together. Rattling could occur. That is, although the outer diameter end of the seal member is in contact with the retainer, the radial relative positional relationship is maintained to some extent, but only the adhesive force between the joint surface of the seal member and the retainer in the rotation direction is used, and thus the seal is not used during use. There is a possibility that the joint surfaces may peel off and slip due to the rotational torque that acts on the members.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to integrally mold a seal member and a retainer, and to firmly fix the seal member and the retainer. (EN) Provided are a retainer-integrated sealing device having a structure and a manufacturing method thereof.

[0010]

In order to achieve the above object, in the present invention, an annular seal member made of resin and an annular retainer made of resin for supporting one end of the seal member in the radial direction are provided. In the retainer-integrated sealing device integrally formed by insert molding, the retainer is provided with a seal member fixing portion to which one end of the seal member is fixed in an embedded state, and the seal member fixing portion partially includes the seal member. An opening is provided such that the side surface is exposed, and an engaging portion that engages with the resin portion on the opposite side of the exposed surface of the seal member exposed to the opening from the side where the opening is provided is provided. It is characterized by being provided.

In the manufacturing method of the present invention, a part of the resin material for the seal member is inserted into the cavity of the molding die, and the retainer molding resin material is injected and filled into the cavity to form the resin material for the seal member and the retainer. In a method of manufacturing a retainer-integrated sealing device that integrally molds, a part of the resin material for the sealing member is deformed by using the injection pressure of the resin material for molding the retainer, and the resin material for molding the retainer is applied to the deformed portion of the resin material. It is characterized in that a concave and convex engaging portion is formed between the joint surface of the retainer and the resin material by being bitten and cured.

Further, it is characterized in that the resin material for the seal member is compression-molded into a predetermined shape by utilizing the mold clamping pressure at the time of molding.

[0013]

According to the present invention, between the retainer and the seal member,
Not only the adhesive force between the resin material for the retainer and the resin material for the seal member at the time of insert molding, but also the mechanical concavo-convex engagement relationship can be obtained, so that the retainer and the seal member can be firmly fixed. .

The openings may be formed on both the front and back side surfaces, or may be provided only on one of the front and back side surfaces. The openings formed on both sides of the front and back side surfaces are formed with different phases in the circumferential direction.

The engaging portion may be constituted by a convex portion protruding toward the opening portion, a concave portion depressed toward the opening portion, or both.

Further, according to the manufacturing method of the present invention, the engaging portion is formed by deforming the resin material for the seal member by utilizing the filling and injecting pressure of the resin at the time of insert molding.

In order to deform a part of the resin material, the mold is provided with a resin material pressing portion for receiving one side of the portion of the resin material to be deformed, and the resin material pressing portion is provided with a resin material escape recess corresponding to the deformed portion. The provision is effective because the injection pressure can be efficiently applied to the resin material.

In particular, if the resin material pressing portion is arranged with the phases shifted so as to alternately press both side surfaces of the resin material in the circumferential direction, the resin material can be stably held in a balanced manner in the molding die. It is suitable.

Furthermore, if the resin material pressing portions on both side surfaces of the resin material adjacent to each other are provided with overlapping regions, and both side surfaces of the resin material are pressed from both sides in this overlapping region to deform the resin material, the deformation region is overlapped. The effect on the seal lip side can be eliminated because it is limited during the period. Thereby, the shape of the seal lip can be maintained in a uniform circular shape, and a uniform seal surface pressure can be obtained.

Further, by utilizing the mold clamping pressure, the concave and convex portions provided on the molding die are transferred to the surface of the resin material for the sealing member to form a screw groove or the resin material for the sealing member is bent to form the sealing member. If the lip shape is obtained, the number of molding steps can be reduced, which is effective.

Of course, it is also possible to heat-treat the resin material for the seal member after molding and bend the resin material to obtain the lip shape of the seal member.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 1 shows a retainer-integrated sealing device according to an embodiment of the present invention. The sealing device 1 includes a seal member 2 and a resin retainer 3 integrally molded with the seal member 2. It is configured.

The seal member 2 is made of, for example, a fluororesin such as PTFE (polytetrafluoroethylene) or another resin suitable for the seal member 2 having low friction, heat resistance and wear resistance, and the retainer 3 is made of phenol resin. Molded with a polyamide resin such as nylon, a PPS resin, or a resin material having heat resistance and physical strength increased by adding a filler such as glass fiber based on these resin materials.

The seal member 2 is a washer-shaped flexible ring member, the outer end of which is fixed to the retainer 3 and the inner end of which is slidably and sealingly contacted with the surface of a rotating member such as a crankshaft. Are configured.

As shown in FIG. 2 (c), the seal lip 4 is bent at the root position on the outer diameter side so as to project toward the fluid O to be sealed and extends in a conical shape. 5 contacts the surface of the rotating member 6. By rotating on the inner peripheral surface of the seal lip 4, the fluid to be sealed is supplied with the fluid to be sealed side O
A screw groove 7 having a screw pump function of pushing back to the is provided. In this embodiment, the thread groove 7 is formed over substantially the entire width of the seal lip 4 from the lip tip 5 to the root portion.

The shape of the seal lip 4 is a straight shape that is not bent conically at the base position and is orthogonal to the rotating member 6, and is bent and curved by the elasticity of the seal lip 4 itself. The rotating member 6 may be brought into contact with. In some cases, the straight shape may be left in contact with the rotary member 6 at a right angle.

The retainer 3 is provided with a seal member fixing portion 8 for fixing the outer diameter end of the seal member 2 in a buried state. The retainer 3 is a thick-walled plate-shaped member that is formed to match the mating mounting surface, and has a circular shaft insertion hole 9 for passing the rotating member 6 in the center thereof, and an inner peripheral edge of this shaft insertion hole 9 An annular seal member fixing portion 8 for sandwiching and fixing the seal member 4 is provided, and a bolt insertion hole 10 for fixing the retainer 3 to a mating mounting surface is provided on the outer peripheral portion.

In this embodiment, the retainer 3 is mounted on the cylinder block 11 as a mating mounting surface, and has a substantially isosceles trapezoidal planar shape, specifically, the lower end portions of the left and right sides of the trapezoid are linearly moved up and down respectively. It has a cut shape. The shaft insertion hole 9 is provided in the center of the trapezoid, the annular seal member fixing portion 8 is inscribed in the upper side and the bottom side of the isosceles trapezoid, and there is a slight distance between the left and right sides and the sealing member fixing portion 8. There is. The mounting bolt insertion holes 10 are provided in the vicinity of the four apexes of the trapezoid, and positioning holes 12 for mounting are provided in the middle of the left and right sides. Further, the bottom surface portion 13 is formed to be thicker than other portions, and screw holes 14 for fixing bolts for fixing an oil pan (not shown) are provided at two positions on the left and right with the shaft insertion hole 9 interposed therebetween. In the bolt insertion hole 10 and the screw hole 14 described above, a metal bush 1 made of resin is used to receive the tightening force at the time of mounting.
5 and the screw hole member 16 are embedded.

The rear surface of the retainer 3 is the cylinder block 1
It is fixed to the mounting end face of No. 1 in a sealed state via a gasket (not shown), and as shown in FIG. 1 (b), the end face 17 of the annular seal member fixing portion 8 around the shaft insertion hole 9 and the end face 17
An outer shape end face 18 that borders the outer shape of the retainer 3 that connects the bolt insertion holes 10 at some locations is formed in the same plane, and the mounting surface of the retainer 3 with the cylinder block is sealed. In addition, two points on the diagonal line around the seal member fixing portion 8 are set as the gate positions 341. By providing the gate position 341 around the seal member fixing portion 8 in this way, the orientation of the filler (glass fiber or the like) mixed with the resin material is provided in the circumferential direction to increase the strength.

The seal member fixing portion 8 is integrally formed by insert molding so as to sandwich the outer diameter end portion 19 of the seal member 2, and the outer diameter end portion 1 of the seal member 2 is formed.
9 is embedded in the resin of the retainer 3. Therefore, the resin is wound around according to the shapes of the outer peripheral end surface 191 and the front and back side surfaces 192 and 193 of the outer diameter end portion 19 of the seal member 2, and is integrally fixed to the retainer 3.

The seal member 2 is attached to the seal member fixing portion 8.
The opening 20 is provided so that one of the front and back sides of the seal member 2 is exposed, and the sealing member 2 exposed in the opening 20 is provided.
An engaging portion 21 that engages with the resin portion of the support portion on the side opposite to the side where the opening 20 is provided on the exposed surface is provided.

The engaging portion 21 not only sandwiches the front and back sides, but also mechanically catches in the radial direction and the rotation axis direction, so that the seal member 2 is retained by the retainer 3.
It can be firmly fixed without relative displacement.

As shown in an enlarged view in FIG. 2, the engaging portion 21 is provided with a convex portion 22 protruding toward the opening 20 side. That is, the seal member 2 is provided with a hollow convex portion 22 that partially protrudes toward the opening 20 side, and the hollow portion 23 of the convex portion 22 is engaged with and fixed to the protrusion 24 made of resin that constitutes the retainer 3. There is. This concavo-convex engagement is formed by deforming the seal member 2 by the resin material injection pressure during molding.

However, the structure of the engaging portion 21 is as shown in FIG.
As shown in (d), it may be configured by a concave portion 25 that is depressed toward the opening 20 side. That is, the seal member 2 has a recess 2
Only the amount of 5 bites into the resin portion and engages with the resin portion in a concavo-convex manner.

In this embodiment, the openings 20 are equally arranged on both front and back surfaces, and the phases of the openings 20 provided on both front and back surfaces are the same for the front and back surfaces.
They are arranged so as to alternate between 0s.

In the case of this embodiment, the opening 20 is formed so as to open on the inner peripheral side as well, in other words, the inner peripheral edge of the seal member fixing portion 8 is either one of the front and back side surfaces of the seal member 2. It is a notch so that it is exposed.

Further, in the case of the present embodiment, the opening portion 20 is a portion radially inside the seal member fixing portion 8, and the outer diameter end portion of the portion where the opening portion 20 is provided depends on the seal member fixing portion 8. It is fixed all around.

In this embodiment, the opening 20 is formed in a notched shape so that the inner peripheral side is also open, but as shown in FIG. 2 (e), the inner peripheral side may be closed. The cutout shape has an effect of preventing the seal member 2 from waviness, and the seal portion 2 has an effect of preventing the seal portion 2 from coming off when the inner circumference is closed as shown in FIG.

Next, a method of manufacturing the above-described retainer-integrated sealing device will be described.

The sealing device is manufactured by insert-molding the resin material 30 for the annular seal member when the resin retainer 3 is molded.

FIG. 3 shows a schematic view of a mold used for insert molding. In this schematic, the shape of the retainer is shown as a simple annular shape.

The mold 31 includes a lower mold 32 on which the resin material 30 for the sealing member is placed, and a sprue 3 for injecting the molten resin material.
3 and an upper mold 35 provided with a gate 34,
A positioning guide part for positioning the resin material, a mold concavo-convex transfer part (pressure bonding part) to the resin material, a resin material pressing part, and a retainer part cavity 55 are provided.

The lower die 32 has a central guide protrusion 36 protruding in a cylindrical shape, and a circular annular recess 37 concentrically formed at a position separated from the guide protrusion 36 by a predetermined distance.
A flat annular first crimping surface portion 38 for crimping the lower surface of the resin material 30 is provided between the annular recess 37 and the guide convex portion 36, and is adjacent to the outer side of the annular recess 37. The end surface serves as a mold matching surface 39 with the upper mold 35.

The outer peripheral surface of the guide convex portion 36 serves as a positioning guide portion. That is, the guide convex portion is a conical inclined surface whose base portion has a diameter substantially the same as the inner diameter of the resin material and whose tip portion gradually decreases in diameter toward the tip. The material is fitted and positioned on the outer circumference of the cylindrical surface at the base position.

Further, on the inner wall surface of the annular recess 37, a plurality of resin material pressing projections 40 corresponding to the openings 20 of the seal member fixing portion 8 of the retainer 3 are equally arranged in the circumferential direction. An escape recess 41 corresponding to the protrusion 22 forming the engaging portion 21 of the seal member 2 is provided on the upper end surface of the resin material pressing protrusion 40. The relief recess 41 is the protrusion 22.
Corresponding to, it is engraved in a hemisphere.

On the other hand, the upper die 35 is provided at the center thereof with a fitting hole 47 into which the central guide convex portion 36 of the lower die 32 is fitted. An annular step convex portion 48 protruding downward is provided around the fitting hole 47 on the lower surface of the upper mold 35, and a flat surface 49 is provided around the step convex portion 48. The lower surface of the step convex portion 48 is a flat annular second pressure-bonding surface portion 5 that faces the first pressure-bonding surface portion 38 of the lower mold 32.
It is 0. And, the outer diameter end of the upper mold 35 is the lower mold 3
The second mating surface 51 is formed, and at the time of mold matching, the distance a between the first and second crimping surface portions 38, 50 is smaller than the thickness of the resin material 30, and the first and second crimping surface portions 38,
The resin material 30 is pressure-bonded from above and below by means of 50, and constitutes a mold unevenness transfer portion.

Further, on the outer wall surface of the step convex portion 48, a plurality of resin material pressing convex portions 52 corresponding to the openings 20 of the seal member fixing portion 8 of the retainer 3 are arranged in the circumferential direction. An escape recess 53 corresponding to the protrusion 22 forming the engaging portion 21 of the seal member 2 is provided on the upper end surface of the resin material pressing protrusion 52. The escape recess 53 is formed in a hemispherical shape corresponding to the resin material pressing protrusion 52.

The outer peripheral wall of the step convex portion 48 of the upper die 35 and the lower die 3
Each diameter of the inner peripheral wall of the annular recess 37 of 2 is the same diameter (φB)
On the other hand, the diameters (φC) of the inner peripheral surfaces of the upper and lower resin pressing convex portions 40 and 52 are the same. The resin material pressing convex portion 52 is the resin material pressing convex portion 4 of the lower mold 32.
The phases are provided so as to be staggered with respect to 0. In particular, in this embodiment, the upper and lower resin material pressing convex portions 40 and 52 have overlapping regions 56 that overlap each other, as shown in FIG.
0 is partially pressed and pressed.

In this embodiment, the first die of the lower die 32 is particularly used.
The screw thread 5 for transfer as an unevenness transfer portion, in which unevenness is formed opposite to the screw groove 7 to transfer the screw groove 7 on the crimping surface portion 38.
4 is projected. The unevenness of the transfer screw 54 is
Inversions are provided to allow for shrinkage with respect to the shape required for sealing. Then, it is crimped by a mold clamping force to form a seal shape as shown in FIG. At this time, the cavity dimension a, which is the clearance dimension between the upper and lower molds in the mold clamped state.
The crimping force is controlled to transfer the screw thread 34 for transfer as the mold unevenness.

Next, the procedure of insert molding using the mold 31 will be described.

First, a washer-shaped resin material 30 for a sealing member is molded in advance. The molding of this material can be easily obtained by, for example, cutting a resin cylindrical body formed into a cylindrical shape into slices. This resin material 30 for seal members
Is molded to be slightly thicker than the finished seal member 2.

Next, the resin material 30 is set in the lower mold 32 that has been opened. In the set of the resin material 30, the central hole 30a of the resin material 30 is fitted along the outer periphery of the guide convex portion 36 of the lower mold 32, and the lower surface is placed on the first pressure bonding surface portion 38. At this point, the outer diameter end 30b of the resin material 30 is the first
The crimping surface portion 38 is located inside the annular recess 37 from the outer diameter end.

Next, the upper die 35 is clamped.

By this mold clamping force, the upper and lower surfaces of the resin material 30 are pressure-bonded up and down by the first and second pressure-bonding surface portions 38 and 50 to have a predetermined wall thickness, and are formed on the first pressure-bonding surface portion 38. The shape of the thread groove 7 is formed by the transfer screw thread 54.

In this molding, it is preferable that the resin material 30 is softened under heating. Since the mold 31 is usually heated, it can be easily molded by utilizing the heat of the mold 31. Then, the retainer cavity 55 sealed by the annular recess 37 of the lower mold 32 and the peripheral wall and the flat surface of the step convex portion 48 of the upper mold 35.
Is formed, and the outer diameter end 30b of the resin material 30 is inserted into the cavity 55.

After the mold is clamped, the sprue 33 and the gate 3
A molten or fluidized resin material is injected through 4. The molding resin material is filled in the cavity 55 without any gaps, and particularly at the outer diameter end 30b of the resin material 30, it wraps around from the outer diameter end face to the outer diameter end upper and lower side surfaces, and the resin material pressing convex portions 40, 52 are vertically moved. The resin material 30 is pressure-bonded to the end faces by injection pressure, and the resin material 30 deforms and enters the escape recesses 41 and 53 provided in the upper and lower end faces,
A hemispherical convex portion 22 is formed following the concave shape.

Particularly, in this embodiment, the upper die 35 and the lower die 32
Since the overlapping region 56 is provided between the resin material pressing convex portions 40 and 52, the resin material 30 is firmly fixed in the overlapping region 56, and only the portions corresponding to the escape concave portions 41 and 53 of the resin material 30 are formed. Can be deformed, and the influence of the deformation does not affect the seal lip 7 side. In addition, the escape recesses 41, 5
By pressing both sides of 3 to apply pressure, the pressure is applied to the escape recesses 41 and 53 in a concentrated manner, and the resin material 30 is easily deformed.

The resin material pressing convex portions 40, 52 are formed in the lower mold 32,
The upper mold 35 is provided at the opposite positions so as to be located between the resin pressing convex portions adjacent to each other, whereby φB to φC are provided.
In the range, that is, in the annular region of the width in the radial direction of the resin pressing portions 40 and 52, the resin material 30 is placed in the lower die 32 and the upper die 35.
By pressing with and alternately along the circumferential direction, it becomes possible to stabilize the position of the resin material 30 when the molten resin is filled, and to improve the embedding strength of the resin material 30 in the retainer 3.

FIG. 4 (g) shows a molded product molded in this way.

Molded product 10 obtained in the insert molding process
Although the thread groove 7 is transferred to the resin material 30, 0 has a straight shape in which the molded seal lip corresponding portion 400 still linearly extends in the radial direction, and the seal lip corresponding portion 400 still has a conical inclination. Not marked.

As means for molding the seal lip 4 having a predetermined shape by inclining the seal lip corresponding portion 400,
As shown in FIG. 5A, a method of performing heat treatment with the molded product 100 fixed to a pair of first and second restraint jigs 61 and 62 is used. The first and second restraint jigs 61 and 62 are ring-shaped members that sandwich the seal lip corresponding portion 400 from above and below, and the first restraint jig 61 is the back side surface of the seal lip 4 (the thread groove 7 is not provided). The second restraint jig 62 is formed in a curved shape on the front side surface (the side where the thread groove 7 is provided) of the seal lip 4.

The first and second restraining jigs 61 and 62 sandwich the flat seal lip corresponding portion 400 which is heated and softened from above and below, and screws according to the shapes of the restraining jigs 61 and 62. The seal lip 4 having a predetermined shape is obtained by plastically deforming it into a curved shape such that the front side surface on which the groove 7 is provided is the inner side, and cooling.

The heating of the seal lip corresponding portion 400 is performed by the first
It may be heated and softened before being fixed to the second restraint jigs 61 and 62, or may be heated after being fixed to the first and second restraint jigs 61 and 62. When cooled after a lapse of a predetermined time, the seal lip 4 having a predetermined shape can be molded by being cured in the bent shape.

FIG. 5B shows the seal lip corresponding portion 4
This is a method of obtaining a lip shape inclined by a predetermined angle by giving a tightening margin α to the inner diameter end of 00.

The third restraint jig 63 is composed of a tubular body having a hollow hole 65 formed to follow the outer shape of the retainer 3 so that the outer circumference of the retainer 3 is fitted.

The fourth restraint jig 64 is a shaft body which is concentrically inserted into the hollow hole 65 of the third restraint jig 63 so that the inner diameter end of the seal lip corresponding portion 400 has a predetermined amount of interference. The outer diameter of the fourth restraint jig 64 is the seal lip corresponding portion 40.
The inner diameter is set to be larger than 0. However, the tip portion of the fourth restraint jig 64 has a tapered surface 66 that gradually becomes smaller toward the tip until it becomes smaller in diameter than the inner diameter of the seal lip corresponding portion 400.

The processing procedure is as follows:
3, 64 are heated, and the third and fourth restraint jigs 63,
The molded product 100 is inserted between 64. With respect to the insertion direction, the front surface side provided with the thread groove 7 is inserted toward the front in the insertion direction. At that time, the seal lip corresponding portion 400 is heated and softened through the restraining jigs 63 and 64, and the seal lip corresponding portion 400 is pushed in while gradually increasing the inner diameter by the tapered surface 66. Due to this pushing, the seal lip corresponding portion 400 bends and inclines toward the side opposite to the insertion direction and the inner diameter increases.

Then, after a lapse of a predetermined time, it is cooled to obtain the seal lip 4 having a predetermined shape.

In the above embodiment, the case where the thread groove processing is performed at the same time as the insert molding has been described as an example. However, in the case of the type of sealing device in which the thread groove 7 is not provided, the thread groove processing is not necessary, and of course. However, the screw 54 for transfer is not required in the mold.

Even in the case of the sealing device of the type in which the thread groove 7 is provided, the thread groove processing can be performed after the insert molding without performing the groove processing at the same time as the die molding. In that case, the thread groove may be formed by cutting, as shown in FIG.
Crimping type first and second restraint jigs 61, 6 as shown in (b)
When using 2, the screw groove can be formed at the time of crimping by the restraining jigs 61 and 62.

Next, in the above embodiment, the seal lip molding step is processed in a separate step after the insert molding.
As shown in FIGS. 6A and 6B, the sealing lip 4 itself can be bent at the same time by utilizing the mold clamping pressure.

The basic structure of the mold is the same as that shown in FIG. 3, and the same components are designated by the same reference numerals and their description is omitted.

In this embodiment, the first and second pressure bonding surface portions 38
1, 501 are curved according to the curved shape of the seal lip 4. The outer peripheral surface of the central convex portion 361 of the lower die 32 is an inclined surface whose diameter gradually decreases toward the tip, while the outer peripheral surface of the central convex portion 361 is formed on the inner peripheral surface of the fitting hole 47 of the upper die 35. Is provided with a tapered inner inclined surface 471 for tightly fitting.

In this way, insert molding and bending of the resin material for the seal member can be performed in one step simultaneously with insert molding.

In the illustrated example, the screw thread 54 for transferring the screw groove is not provided, but the screw thread 54 can be provided as in FIG. 3, and if the screw groove 7 is also molded at the same time, insert molding, screw groove processing can be performed. Also, the bending process of the seal lip can be performed in one step simultaneously with the insert molding.

FIGS. 6 (c) and 6 (d) show still another embodiment in the case where the bending molding of the seal lip is performed at one time.

In this embodiment, as shown in FIG. 6 (e), the shape of the seal lip 4A is not a curved shape but a lip waist portion 401 bent out into a cylindrical shape, and a lip tip portion conically narrowed. This is a case of molding a retainer-integrated sealing device having a complicated shape having 402.

The seal lip 4 having such a complicated shape
Is compression-molded by the mold clamping pressure. In the case of the mold 31, the transfer concavo-convex shape is not a screw groove but a lip-shaped concavo-convex shape.

In that respect, the resin material 30A to be inserted
As an example, it is formed into an umbrella washer shape that is inclined like an umbrella.

On the outer peripheral surface of the central convex portion 36 of the lower mold 32, an outer peripheral conical portion 361, an outer peripheral cylindrical surface portion 362 at the base position,
It consists of On the other hand, in the fitting hole 47 provided in the upper mold 35, an inner peripheral cylindrical surface portion 472 formed to have a diameter larger than that of the central convex portion 36 by the thickness of the resin material 30A and an inner peripheral conical portion 471 are provided. Has been formed.

When the thread groove 7 is formed on the inner peripheral surface of the seal lip 4, a screw thread may be provided on the outer peripheral surface of the central convex portion 36. When the thread groove 7 is unnecessary, the thread thread is provided. Absent.

Thus, even a complicated seal lip shape can be easily molded in one step.

FIG. 7 shows a more specific structural example of a mold for molding the retainer-integrated sealing device shown in FIG.

As shown in FIG. 7A, the lower mold 32 includes a lower first mold 321 forming a central convex portion and a lower second mold 321 to which the lower first mold 321 is assembled to form a first crimping surface portion 38. 322
The lower second mold 322 is assembled into the lower third mold 323 which constitutes the annular recess 37, and the lower fourth mold 324 which constitutes the bottom surface of the retainer 3.

The upper die 35 is provided with the sprue 33 and the gate 34 at two positions to form the second pressure bonding surface portion 50.
The mold 351 is composed of an upper second mold 352 to which the upper first mold 351 is assembled and which constitutes the mold matching surface 51. Further, a sprue bush 355 to which a nozzle of an injection molding machine (not shown) is connected is attached to a mold plate 353 that supports the upper mold 35.

FIG. 7B is a plan view of the lower second die 322 having the first crimping surface portion 38, and FIG. 7C is a plan view of the upper second die 352 having the second crimping surface portion 50. Yes, basically Figure 3
Since it is the same as the mold configuration shown in FIG. 1, the same components are designated by the same reference numerals and the description thereof will be omitted.

In each of the above embodiments, the so-called inner seal type structure in which the inner diameter end of the seal member is embedded and fixed in the resin retainer has been described, but the outer diameter end of the seal member is embedded and fixed in the retainer. The same can be applied to the so-called outer seal type structure.

[0089]

As described above, according to the present invention,
Since the retainer and the seal member are fixed not only by the adhesive force between the retainer resin material and the seal member resin material during insert molding but also by the mechanical concavo-convex engagement relationship, the retainer and the seal member are more firmly fixed. be able to.

Moreover, according to the manufacturing method of the present invention, since the engaging portion is formed by deforming the resin material for the seal member by utilizing the resin filling injection pressure at the time of insert molding,
It is very easy to get a strong bond.

Further, by utilizing the mold clamping pressure, the concavo-convex portion provided on the molding die is transferred to the surface of the resin material for the seal member to form a screw groove or the resin material for the seal member is bent to form the seal member. If the lip shape is obtained, the number of molding steps can be reduced.

[Brief description of drawings]

FIG. 1 shows a retainer-integrated sealing device according to an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a rear view, and FIG. 1 (c) is a center. Longitudinal section, (d) is a bottom view,
FIG. 7E is a partially enlarged sectional view of the seal member fixing portion.

2 (a) is a partially cutaway enlarged perspective view of a seal member fixing portion of the sealing device of FIG. 1, FIG. 2 (b) is a sectional view taken along line BB of FIG. 2 (a), and FIG. FIG. 6C is a development view showing the engagement portion at a position cut in the circumferential direction, FIG. 7D is an explanatory view in the case where the unevenness of the engagement portion is reversed, and FIG. Explanatory drawing which shows the other aspect of the opened opening part, and the same figure (f) is a schematic diagram of a seal lip contact state at the time of use.

FIG. 3 shows a basic structure of a mold used in a method for manufacturing a retainer-integrated sealing device of the present invention.
(a) is an overall vertical cross-sectional view, (b) is a partially broken perspective view of the lower mold, (c) is a partial view of the cavity side surface of the lower mold, and (d) is the lower part. A partially enlarged cross-sectional view of the resin material pressing portion to be inserted into the mold, FIG. (E) is a partially cutaway perspective view of the upper mold,
FIG. 6F is a view partially showing the surface of the upper die on the cavity side,
FIG. 7G is a partially enlarged cross-sectional view of the upper resin material pressing portion, and FIG. 7H is an enlarged view of the end surface of the first and upper resin material pressing portions.

4 (a) to 4 (g) are explanatory views illustrating an insert molding step of the method for manufacturing the retainer-integrated sealing device of the present invention.

FIG. 5 is an explanatory diagram illustrating a process of bending a seal lip.

FIG. 6 is an explanatory view for explaining a process in the case of molding the shape of the seal lip at the same time as the insert molding.

FIG. 7 is a diagram showing a more specific mold configuration example for molding the sealing device of FIG. 1.

[Explanation of symbols]

 1 Sealing device 2 Seal member 3 Retainer 4 Seal lip 5 Lip tip 6 Rotating member 7 Screw groove 8 Seal member fixing part 9 Shaft insertion hole 10 Bolt insertion hole 11 Opposite mounting member 12 Hole 13 Bottom part 14 Screw hole 15 Bush 16 Screw hole Member 17 Fixed part end face 18 Outer end face 19 Seal member outer diameter end 20 Opening part 21 Engaging part 22 Convex part 23 Hollow part 24 Protrusion 25 Recessed part 26 Molded product 30 Resin material 30a Central hole 30b Outer diameter end 31 Mold 32 Lower Mold 33 Sprue 34 Gate 35 Upper mold 36 Guide convex portion 37 Annular recess 38 First crimping surface portion 39 Mold matching surface 40 Resin material pressing convex portion 41 Escape concave portion 47 Fitting hole 48 Step convex portion 49 Flat surface 50 Second crimping surface portion 51 Mold matching surface 52 Resin material pressing convex portion 53 Escape concave portion 54 Transfer screw thread 55 Cavity 61 to 64th To fourth restraint jig 65 hollow bore 66 tapered surface 100 molded article 400 seal lip corresponding portion

Claims (3)

[Claims] 1. A resin annular seal member and a resin annular retainer that supports one end of the seal member in the radial direction.
In a retainer-integrated sealing device integrally molded by insert molding, the retainer is provided with a seal member fixing portion to which one end of the seal member is fixed in an embedded state, and the seal member fixing portion partially has a side surface of the seal member. And an engaging portion that engages with the resin portion on the side opposite to the side where the opening is provided in the exposed surface portion of the seal member that is exposed in the opening. A retainer-integrated sealing device characterized in that 2. A retainer for integrally molding a resin material for a seal member and a retainer by inserting a part of a resin material for a seal member into a cavity of a molding die and injecting and filling a resin material for molding a retainer into the cavity. In the manufacturing method of the integrated sealing device, a part of the resin material for the seal member is deformed by using the injection pressure of the resin material for the retainer molding, and the resin material for the retainer molding is bitten into the deformed portion of the resin material and cured. Accordingly, a concave-convex engaging portion is formed between the joint surface of the retainer and the resin material, and a method for manufacturing a retainer-integrated sealing device, comprising: 3. The method for manufacturing a retainer-integrated sealing device according to claim 2, wherein the resin material for the seal member is compression-molded into a predetermined shape by utilizing the mold clamping pressure at the time of molding.