JPH08315903A - Seal member and seal structure - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a seal member for ensuring the sealability of a drawn-out portion of an electric wire or the like, and prevents damage caused in the manufacturing process of the seal member and stably secures excellent sealability. The purpose is to [Structure] The seal member 10 includes an inner member 12 and an outer member 1.
It is composed of 4 and. The outer shape of the inner member 12 and the inner diameter of the outer member 14 are formed in a tapered shape that fits with each other. The inner member 12 is provided with a through hole 12a for inserting an electric wire or the like. Annular protrusions 12b and 12c are formed on the inner wall of the through hole 12a.
To provide. A slit 12d for facilitating the diameter expansion of the inner member 12 is provided on the wall surface of the through hole 12a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member and a seal structure, and more particularly to a seal member and a seal structure suitable as a member or structure for ensuring the sealability of a portion where an electric wire or the like is drawn out.

[0002]

2. Description of the Related Art Conventionally, in the field of in-vehicle electrical components and the like, a seal structure has been used at the lead-out portion of the electric wire in order to prevent water from entering the electrical components. As an electric wire seal structure, for example, as disclosed in Japanese Utility Model Laid-Open No. 6-60075, there is known a structure in which an electric wire is held by using a seal member having an annular protrusion on an inner wall of a through hole.

The conventional seal member is made of an elastic material such as rubber. Further, in the above-mentioned conventional seal member, the protrusion is provided so that an appropriate elastic deformation occurs when the electric wire is inserted into the through hole. According to this structure, high adhesion is secured between the protrusion and the electric wire due to the restoring force of the protrusion. Therefore, according to the above-mentioned conventional seal structure, it is possible to appropriately prevent water from entering the inside of the protrusion.

The above-mentioned conventional seal member is manufactured by molding an elastic material such as rubber by using a die imitating the outer shape of the seal member and a core imitating the through hole and the projection. be able to. That is, in manufacturing the above-mentioned seal member, first, an elastic material is formed into the shape of the seal member using the above-mentioned mold and core. Next, the elastic material and the core molded in the shape of the seal member are taken out from the mold. After that, when the core is taken out from the elastic material, the seal member having a desired shape is completed.

[0005]

However, when manufacturing the above-mentioned conventional seal member, stress is applied to the protrusion formed on the inner wall of the seal member when the core is extracted from the elastic material molded into the shape of the seal member. Can't be avoided. At this time, if an unreasonably large stress acts on the protrusions, the protrusions are damaged, and the desired sealability cannot be obtained. In this sense, the above-mentioned conventional sealing member has a problem that the sealing performance is easily impaired in the manufacturing process.

The present invention has been made in view of the above-mentioned points, and an unreasonably large stress acts on the protrusion when the core is pulled out by facilitating the diameter expansion in the vicinity of the protrusion. It is an object of the present invention to provide a seal member and a seal structure that prevent the above problems and solve the above problems.

[0007]

The above-mentioned object is defined in claim 1.
As described in paragraph 1, in a seal member provided with a protrusion for ensuring a sealing property between a member to be inserted into the through hole and an inner wall of the through hole, on the inner wall of the through hole, at least near the protrusion. This is achieved by a sealing member provided with a diameter expanding means that facilitates expanding the diameter of the hole.

The above-mentioned object is as described in claim 2.
In the seal member according to claim 1, the diameter expanding means is also achieved by a seal member having a slit provided on the wall surface of the through hole.

According to a third aspect of the present invention, in the sealing member according to the first and second aspects, the diameter expanding means and the protrusion are provided on an inner member, and an outer member for covering the inner member from the outside is provided. The seal member provided is effective in improving the sealing property of the slit.

As described in claim 4, in the seal structure using the seal member according to claim 3, a seal structure in which an outer member is molded on the outside of the inner member has a sealing property of the diameter expanding means. It is effective in raising it.

[0011]

According to the first aspect of the invention, the through hole and the projection of the seal member are molded by using a core simulating them. When a stress acts on the protrusion when the core is pulled out, the reaction force transmits the force in the radial direction to the inner wall of the through hole. In the present invention, the seal member is provided with the diameter expanding means for facilitating the diameter expansion of the through hole at least in the vicinity of the protrusion. Therefore, when the force in the radial direction is transmitted to the inner wall of the through hole as described above, the seal member easily expands in the vicinity of the protrusion. As a result, the stress acting on the protrusion when the core is pulled out is suppressed, and damage to the protrusion is prevented.

According to the second aspect of the invention, a slit is provided on the wall surface of the through hole of the seal member as a diameter expanding means. For this reason, when the core is pulled out, stress acts on the protrusion, and when the reaction force transmits the force in the radial expansion direction to the inner wall of the through hole, the slit opens and the seal member easily expands in diameter. To do. As a result, the stress acting on the protrusion when the core is pulled out is suppressed, and damage to the protrusion is prevented.

According to the third aspect of the invention, the seal member is composed of an inner member having a diameter expanding means and a protrusion, and an outer member covering the inner member from the outside. The diametrical expansion means of the inner member prevents an unduly large stress from acting on the protrusion provided on the inner wall of the inner member when the core is pulled out from the inner member. The outer member covers the inner member from the outside to prevent water from entering from the enlarged diameter portion of the diameter expanding means. In this case, damage to the protrusions is prevented, and high sealing performance is secured in the seal member.

According to the fourth aspect of the present invention, a molding pressure for molding the outer member acts between the inner member and the outer member. This molding pressure acts to enhance the adhesion between the outer member and the inner member.
Therefore, excellent sealability is ensured between the inner member and the outer member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a seal member 10 which is an embodiment of the present invention will be described below with reference to FIGS.
1 and 2 show a front view and a front sectional view of the seal member 10, respectively.

As shown in FIGS. 1 and 2, the seal member 10 of this embodiment is composed of an inner member 12 and an outer member 14. The inner member 12 and the outer member 14 are members formed by injection-molding a thermoplastic elastomer, which is an elastic material, and have predetermined elasticity.

The inner member 12 is a hollow member which has a through hole 12a in the axial direction and whose outer shape is tapered. On the inner wall of the through hole 12a, two annular protrusions 12b and 12c are provided side by side in the axial direction.
The side wall of the inner member 12 is provided with a slit 12d extending over the entire length of the inner member 12. Slit 12d
Is provided so as to penetrate from the outer peripheral surface of the inner member 12 to the through hole 12a. Therefore, when a force in the diameter expanding direction acts on the inner member 12, the inner member 12 easily expands in diameter by opening the slit 12d.

FIG. 3 is a front sectional view of the upper mold 16, the lower mold 18, and the core 20 used for molding the inner member 12 having the above structure. As shown in FIG. 3, the upper mold 16 and the lower mold 18 are
The outer shape of the inner member 12 is modeled. Further, the core 20 is modeled with a through hole 12a. The core 20 is further provided with annular grooves 20b and 20c corresponding to the protrusions 12b and 12c of the inner member 12, and a blade 20d corresponding to the slit 12d.

In manufacturing the inner member 12, first, the upper mold 16, the lower mold 18, and the core 20 are set in the state shown in FIG. 3, and the superheated thermoplastic elastomer is injected into the inside thereof. Once the thermoplastic elastomer has solidified into the shape of the inner member 12, the solidified thermoplastic elastomer is removed from the core 20.
At the same time, it is released from the upper mold 16 and the lower mold 18. The inner member 12 is then completed by removing the core 20 from the solidified thermoplastic elastomer.

In the above manufacturing process, before the core 20 is removed from the thermoplastic elastomer, the annular grooves 20b and 20c of the core 20 are engaged with the projections 12b and 12c formed on the inner wall of the thermoplastic elastomer. It will be in the state of doing. Therefore, if the thermoplastic elastomer cannot be expanded in diameter when the core 20 is extracted, a large stress acts on the protrusions 12b and 12c during the process of extracting the core 20.

However, in this embodiment, the slits 12d are formed in the thermoplastic elastomer at the time when the injection molding is completed, corresponding to the blade 20d of the core 20. Therefore, when the core 20 is pulled out, the core 20 interferes with the protrusions 12b and 12c, and the protrusions 12b and 12c
When the stress is transmitted to 12c, the reaction force causes slit 12
d opens and the thermoplastic elastomer expands in diameter. in this case,
Since the stress acting on the protrusions 12b and 12c is suppressed, the core 2 is prevented from causing damage to the protrusions 12b and 12c.
It becomes possible to extract 0.

As described above, in this embodiment, since the slit 12d is provided in the inner member 12,
The inner member 1 without damaging the protrusions 12b and 12c
It is possible to complete 2. In the above description, the blade 20d is provided on the core 20, and the slit 12
Although the d is formed, the method of forming the slit 12d is not limited to this, and the upper mold 16 or the lower mold 18 is formed.
It is also possible to form the slit 12 by providing a blade on the base or by making a cut in the thermoplastic elastomer after completion of the injection molding.

The outer member 14 is provided with a through hole 14a formed in a tapered shape so as to be fitted in the inner member 12 in the axial direction. Therefore, as shown in FIG.
The inner member 12 can be housed inside the through hole 14a. The outer member 14 and the inner member 12 are
Since both are made of thermoplastic elastomer having elasticity as described above, when the outer member 14 and the inner member 12 are fitted to each other as shown in FIG.

On the outer periphery of the outer member 14, a large diameter portion 14b,
A small diameter portion 14c and a jaw portion 14d are formed. The outer member 14 having the above-described configuration is the upper mold 22 and the lower mold 2 shown in FIG.
4 and the core 26 can be used for injection molding. As shown in FIG. 4, the outer shape of the outer member 14 is modeled on the upper side 22 and the lower mold 24. Further, the core 26 is imitated with the through hole 14 a.

In manufacturing the outer member 14, first, the upper mold 22, the lower mold 24, and the core 26 are set in the state shown in FIG. 4, and the superheated thermoplastic elastomer is injected into the inside thereof. Once the thermoplastic elastomer has solidified into the shape of the outer member 14, the solidified thermoplastic elastomer is removed from the core 26.
At the same time, it is released from the upper mold 22 and the lower mold 24. The outer member 14 is then completed by removing the core 26 from the solidified thermoplastic elastomer.

The outer member 14 does not have a portion which is difficult to pull out the core 26, unlike the protrusions 12b and 12c of the inner member 12. Therefore, the outer member 14
In manufacturing the, the slit 1 in the inner member 12
It is not necessary to provide a part corresponding to 2d.

The above-mentioned seal member 10 is used to secure the sealing property of the portion where the electric wire or the like is drawn out in a state where the inner member 12 is housed inside the through hole 14a of the outer member 14 as shown in FIG. FIG. 5 is a front sectional view of an electromagnetic pickup sensor 30 in which the sealability of the wire harness pullout portion is ensured by using the seal member 10 of the present embodiment. The electromagnetic pickup sensor 30 is a vehicle-mounted sensor. Therefore, the electromagnetic pickup sensor 30 has
Water resistance and dust resistance are required.

As shown in FIG. 5, the electromagnetic pickup sensor 30 has an electromagnetic coil 32 inside. The electromagnetic coil 32 is configured by forming a winding wire 36 on the outer circumference of the bobbin 34. Both ends of the winding 36 are connected to the bobbin 3
4 is resistance-welded to two terminals 38 (only one of which is shown in FIG. 5) fixed to the upper part of the upper part of FIG.

Inside the bobbin 34, a space for accommodating the magnet 40 and the yoke 42 is formed. In manufacturing the electromagnetic pickup sensor 30, first, the magnet 40 is disposed inside the bobbin 34, then the outer circumferences of the bobbin 34 and the winding wire 36 are covered with the cover body 44, and then the yoke 42 is fixed. The magnet 42 is inserted into the bobbin 34 so that the magnet 42 and the magnet 40 contact each other.

The cover body 44 is the seal member 10 described above.
It is formed by injection molding the same thermoplastic elastomer as that on the outer circumference of the bobbin 34 and the winding 36. The cover body 44 is formed around the inner peripheral side of the bobbin 34 at the tip portion (the lower end portion in FIG. 5) of the bobbin 34. Further, the cover body 44 is provided with an annular seal portion 44a having a semicircular cross section in a portion that wraps around the inner peripheral side of the bobbin 34.

As shown in FIG. 5, the seal portion 44a is constructed so that when the yoke 38 is inserted into the bobbin 34, the seal portion 44a is appropriately elastically deformed and comes into close contact with the side surface of the yoke 42. Therefore, in the state shown in FIG. 5, an appropriate sealing property is secured between the cover body 44 and the yoke 42.

In the manufacturing process of the electromagnetic pickup sensor 30, the cover member 44 is injection-molded, and at the same time, the sealing member 10, that is, the inner member 12 and the outer member 14 is molded by a so-called parent-child picking method. As shown in FIG. 5, the molded seal member 10 has the wire harness 4 with the inner member 12 and the outer member 14 fitted together.
It is fitted on the outer circumference of 6.

At this time, the protrusions 12b and 12c provided on the inner wall of the through hole 12a of the seal member 10 are appropriately elastically deformed and come into close contact with the outer periphery of the wire harness 46. As a result, an appropriate sealing property is ensured between the outer circumference of the wire harness 46 and the inner circumference of the seal member 10.

The wire harness 46 inserted through the seal member 10 has two signal lines 46a and 46b therein. These signal lines 46 a and 46 b are resistance-welded to each of the two terminals 38. The fitting position of the seal member 10 is adjusted so that the seal member 10 has a regular positional relationship with the electromagnetic coil 12 under the condition that the wire harness 46 is connected to the terminal 38.

The electromagnetic coil 32 covered by the cover body 44 and the wire harness 4 fixed to the terminal 38.
6, and the seal member 10 fitted in the wire harness 46 is a housing 48 formed by injection molding.
Are integrated by. That is, the electromagnetic coil 32, the terminal 38, the seal member 10 and the like described above are connected to the yoke 4
2, an electromagnetic pickup portion 42a composed of the tip portion of 2,
Also, except for the large diameter portion 14b of the outer member 14 that constitutes the seal member 10, it is molded inside the housing 48.

In the following description, the cover body 44
And the molding process of the seal member 10 is performed by primary molding,
The molding process of the housing 48 is called secondary molding. In the present embodiment, the primary molding for molding the cover body 44 and the seal member 10 is performed with a melting point of 16 as a thermoplastic elastomer.
3 ° C polyester resin (Toray Hytrel 2551
Using a mixed material of (trade name) and Toray Hytrel 4057 (trade name), the molding temperature is 235 ° C. Further, the secondary molding for molding the housing 48 is performed by using a polyester thermoplastic resin (Toray PBT5101G-30 (trade name)) having a melting point of 224 ° C., which is similar to the thermoplastic elastomer described above, at a molding temperature of 255 ° C. Done in.

Thus, the temperature of the secondary molding (255 ° C.)
However, the melting point of the thermoplastic elastomer used in the primary molding (16
3 ° C.), the cover body 44 is formed during the secondary formation process.
And the surface of the seal member 10 melts. The fact that the resin used in the primary molding and the resin used in the secondary molding are both polyesters of the same system, and at the end of the secondary molding, the contact surface between the housing 48 and the cover body 44 or the seal member 10 is formed. , A welded portion having a strong bonding force is formed.

According to this structure, in the vicinity of the portion where the electromagnetic pickup portion 42a is exposed from the housing 48, a sufficient seal is provided between the cover body 44 and the yoke 42 and the interface between the cover body 44 and the housing 48. It is possible to secure the sex. In addition, in the periphery of the seal member 10 where the wire harness 46 is exposed from the housing 48, sufficient sealability is provided between the inner periphery of the seal member 10 and the outer periphery of the wire harness 26 and at the interface between the seal member 10 and the housing 48. Can be secured.

By the way, when the sealing member 10 is molded by the housing 30 as described above, the molding pressure as shown by the arrow in FIG. 6 acts on the periphery of the sealing member 10 during the secondary molding. Of such molding pressure,
Small-diameter portion 14c of the outer member 14 constituting the seal member 10
The mold pressure that acts on the outer member 14 acts as a force that reduces the diameter of the outer member 14. Further, among the molding pressures that act during the secondary molding, the molding pressure that acts on the side surface 12e of the inner diameter member 12 acts as a force that strengthens the fitting between the inner member 12 and the outer member 14. Therefore, any of these mold pressures acts as a force that enhances the adhesion between the inner member 12 and the outer member 14.

Further, the inner member 12 of the seal member 10 is provided with the slit 12d. However, as described above, the outer member 14 is reduced in diameter during the secondary molding, and the inner member 12 is formed.
When the fitting between the outer member 14 and the outer member 14 is strengthened, the slit 12
d is firmly sealed.

Therefore, in the electromagnetic pickup sensor 30, the inner periphery of the seal member 10 and the wire harness 26 are
Between the seal member 10 and the housing 48.
In addition to being able to secure a sufficient sealability at the interface with the inner member 12, the interface between the inner member 12 and the outer member 14 constituting the seal member 10 and the slit 12d of the inner member 12
Sufficient sealing property can be secured even in the portion.

In this way, the electromagnetic pickup sensor 30
According to the seal structure obtained by further molding the seal member 10, the seal member 10 has the slit 1
Even with the configuration including the inner member 12 including 2d and the outer member 14 that covers the inner member 12, high sealing performance can be ensured at the drawn-out portion of the wire harness 46.

Therefore, according to the above-mentioned structure, sufficient sealing performance can be secured around the portion where the electromagnetic pickup portion 42a is exposed from the housing 30 and around the portion where the wire harness 46 is exposed from the housing 30. It is possible to impart sufficient water resistance and dust resistance to the electromagnetic pickup sensor 30.

According to the seal member 10 of this embodiment, the wire harness 46 is first inserted into the through hole 12a of the inner diameter member 12, and then the outer member 14 is fitted to the outer periphery of the inner diameter member 12, The seal member 10 can be attached to the wire harness 46. At this time, the inner diameter member 1
The work of assembling the wire harness 2 into the wire harness 46 can be performed very easily because the diameter expansion of the inner diameter member 12 is allowed. Therefore, according to the seal member 10, the assembly to the wire harness 46 is facilitated, and the protrusions 12b, 1 generated at the time of the assembly to the wire harness 46 are formed.
It is possible to prevent damage to 2c.

In the above description, the large diameter portion 14b of the seal member 10 is exposed to the outside of the housing 48 during the secondary molding, but the method of molding the seal member 10 is not limited to this. However, the entire structure may be molded with the housing 48.

Further, in the above description, a thermoplastic elastomer having a relatively low melting point is used as the resin for the primary molding, and a thermoplastic resin having a relatively high melting point is used as the resin for the secondary molding. Member 10 and housing 30
It is supposed to weld the interface with. According to this structure, the slit 12d, the inner member 12, and the outer member 1 are provisionally provided.
Even if water leaks from the interface with 4, the entry can be reliably prevented at the interface between the seal member 10 and the housing 30.

However, as a mode of using the seal member 10, it is not essential to weld the seal member 10 and the housing 48, and if the seal member 10 has an appropriate elasticity, a sufficiently excellent sealing property is obtained. It is possible to secure Therefore, the material of the seal member 10 is not limited to the above-mentioned thermoplastic elastomer, but has appropriate elasticity such as rubber and thermoplastic resin, and
It is also possible to mold the seal member 10 using a material that can be injection-molded.

Further, in the above description, the seal member 10 is limited to be used for ensuring the sealing property of the drawn-out portion of the wire harness 46, but the use of the seal member 10 is not limited to this. The rod-shaped member can be widely used to secure the sealing property of the pulled-out portion.

FIG. 7 is a front view of an inner member which constitutes a seal member according to the second embodiment of the present invention. The inner member 50 shown in FIG. 7 has a taper outer shape, and has two protrusions 50b and 50c on the inner wall of the through hole 50a, like the inner member 12 described above. Also,
The inner member 50 includes a crank-shaped slit 50d. The slit 50d minimizes the influence on the protrusions 50b and 50c, so that any of the protrusions 50b and 5c
It is also configured to be orthogonal to 0c.

When the slits are provided in a crank shape,
A longer slit length can be secured as compared with the case where the slits are linearly provided. The longer the slit length, the higher the water blocking ability can be secured in the slit portion. Therefore, according to the inner member 50 of the present embodiment, it is possible to configure a seal member having a higher sealing property as compared with the case of using the inner member 12 described above.

FIG. 8 is a front view of an inner member which constitutes a seal member according to the third embodiment of the present invention. The inner member 52 shown in FIG. 8 has three protrusions 52 on the inner wall of the through hole 52a.
b to 52d and their protrusions 52b
It is provided with a two-stage crank-shaped slit 52e configured so as to be orthogonal to any of .about.52d. With this configuration, it is possible to secure a longer slit length than the inner member 50 shown in FIG. Therefore, according to the inner member 52 of the present embodiment, it is possible to configure a seal member having a higher sealing property than the case where the inner member 50 described above is used.

FIG. 9 is a front view of an inner member which constitutes a seal member according to the fourth embodiment of the present invention. The inner member 54 shown in FIG. 9 is similar to the inner member 52 shown in FIG.
This is a configuration example in the case where the inner wall of the through hole 54a is provided with three protrusions 54b to 54d. As shown in FIG. 9, the inner member 5
4 has a spiral slit 54e. With this configuration, it is possible to secure a long slit length similarly to the inner member 52 shown in FIG. 8 while suppressing the influence of the protrusions 54b, 54c, 54d. Therefore, according to the inner member 54 of the present embodiment, it is possible to configure a seal member having a high sealing property as in the case of using the inner member 52 described above.

FIG. 10 is a front view of an inner member which constitutes a seal member according to a fifth embodiment of the present invention. The inner member 56 shown in FIG. 10 includes two protrusions 56b and 56c on the inner wall of the through hole 56a, and these protrusions 56b
A slit 56d that is orthogonal to b and 56c and does not penetrate in the axial direction of the inner member 56 is provided.

With this structure, the inner member 56 can be easily expanded in diameter in the vicinity of the protrusions 56b and 56c. Therefore, in the process of manufacturing the inner member 12, when the core that imitates the through hole 56a and the protrusions 56b and 56c is pulled out, unduly large stress does not act on the protrusions 56b and 56c. Therefore, even with the inner member 56 of this embodiment, the above-mentioned inner members 12, 50, 52,
Similar to 54 and the like, high sealability can be ensured between the through hole 56a and the wire harness inserted therein.

Further, as described above, according to the construction in which the slit 56d does not penetrate in the axial direction of the inner member, the inner member 5
When the outer member 14 and the outer member 6 are fitted together, the slit 56d
Is covered with the outer member 14.
Therefore, according to the seal member configured by using the inner member 56, it is possible to reliably prevent water from entering through the slit 56d. Therefore, according to the inner member 56 of the present embodiment, it is possible to configure a seal member having excellent sealing properties both inside and outside the through hole 56a.

FIG. 11 is a front view of an inner member which constitutes a seal member according to a sixth embodiment of the present invention. The inner member 58 shown in FIG. 11 is similar to the above-mentioned inner member 12 in that the upper and lower sides of the outer shape of the inner member 58 and the through holes 58 are formed.
It is molded using a core that imitates a and the protrusions 58b and 58c. The projections 58b and 58c provided on the inner wall of the through hole 58a of the inner member 58 are designed such that the inner diameter becomes smaller toward the side from which the core is extracted (the right side in FIG. 11).

With this structure, when the core is pulled out, the protrusions 58b and 58c can be elastically deformed in the radial direction without being damaged. Therefore, according to the inner diameter member 58 of the present embodiment, it is possible to configure a seal member that can hold the wire harness inserted into the through hole 58a with high sealing property.

By the way, since the inner diameter member 58 does not have a slit, it is not always necessary to fit the outer diameter member 14 for use. Therefore, with respect to the inner diameter member 58, the inner diameter member 58 itself can be used as a seal member.
FIG. 12 shows a front view of an inner member which constitutes a seal member according to a seventh embodiment of the present invention. Inner member 6 shown in FIG.
0 is the upper side and the lower side of the outer shape of the inner member 60, and the through hole 60a and the protrusion 6 as in the case of the inner member 12 described above.
It is molded using a core imitating 0b and 60c. The outer diameter of the inner member 60 is provided with a small diameter portion 60c in order to reduce the wall pressure of the outer peripheral portions of the protrusions 60b and 60c.

According to this structure, when a stress is applied to the protrusions 60b and 60c when the core is pulled out, the stress easily expands the protrusions 60b and 60c and the small diameter portion 60c. Therefore, according to the inner diameter member 60 of the present embodiment, it is possible to remove the core without applying unreasonably large stress to the protrusions 60b and 60c. Therefore, according to the inner member 60, it is possible to configure a seal member that can hold the wire harness inserted into the through hole 60a with high sealing properties.

By the way, the inner diameter member 60 can be used in combination with the above-mentioned outer member 14, but according to such a usage mode, a hollow portion is formed between the outer member 14 and the small diameter portion 60c. To be done. When such a hollow portion is formed, it becomes difficult to secure high adhesion between the wire harness inserted into the through hole 60a and the protrusions 60b and 60c. Therefore, when the inner member 60 is used, it is desirable to fit an annular member on the outer periphery of the small diameter portion 60c or to shape the inner wall of the outer member 14 so as to fit the small diameter portion 60c.

In the above description, the outer shape of the inner member 12, 50, 52, 54, 56, 58 and the inner diameter of the outer member 14 are tapered, but they are not necessarily tapered. By forming both the inner member and the outer member to have a cylindrical diameter without the need for molding, a sufficiently excellent sealing property can be obtained.

Incidentally, in the above-mentioned embodiment, the slits 12d, 50 of the inner members 12, 50, 52, 54, 56 are formed.
d, 52e, 54e, 56d, the protrusion 5 of the inner diameter member 58
8b and 58c and the small diameter portion 60c of the inner diameter member 60 correspond to the diameter expanding means.

Although the embodiments of the present invention have been described above, the embodiments of the present invention include embodiments of the following technical matters in addition to the technical matters described in the claims. Please note. (1) In the seal structure using the seal member according to claim 3, the outer shape of the inner member and the inner diameter of the outer member are formed in a tapered shape that fits each other, and the outer member is molded. A seal structure characterized by being molded.

In the above embodiment, the inner member and the outer member are tapered so that they fit with each other.
Since the inner member is covered with the outer member, the slit provided in the inner member has a high sealing property. When the outer member is molded under such a structure, the molding pressure acting on the outer peripheral surface of the outer member and the side surface of the inner member both act to further enhance the adhesion between the outer member and the inner member.

Therefore, according to the seal structure according to the above-described embodiment, in addition to being able to enjoy the same effect as that of the invention described in claim 3, the sealability of the slit and between the inner member and the outer member are provided. It is also possible to enjoy the effect of being able to impart a further excellent sealing property.

[0066]

As described above, according to the invention described in claim 1, when a force in the diameter expanding direction is applied to the inner wall of the through hole by the function of the diameter expanding means, the sealing member is provided in the vicinity of the protrusion. However, the diameter can be easily expanded. Therefore, according to the seal member of the present invention, the protruding portion is not damaged by being subjected to a large stress in the manufacturing process, and the quality excellent in the sealing property can be stably obtained.

According to the second aspect of the invention, the opening of the slit allows the seal member to easily expand the diameter in the vicinity of the protrusion when a force in the diameter expanding direction acts on the inner wall of the through hole. You can Therefore, even with the seal member according to the present invention, the protrusions are not damaged by being subjected to a large stress in the manufacturing process, and it is possible to stably obtain the quality excellent in the sealing property.

According to the third aspect of the invention, when a force in the radial direction is applied to the inner wall of the inner member, the inner member can be expanded by opening the expanded portion of the diameter expanding means. .
Therefore, the protrusions are not damaged during the manufacturing process of the inner member. The diameter expanding means provided on the inner member is closed by the outer member. Therefore, according to the seal member of the present invention, excellent sealability can be obtained both inside and outside the through hole of the seal member.

According to the fourth aspect of the invention, the mold pressure acting between the outer member and the inner member when molding the outer member improves the adhesion between the inner member and the outer member. Therefore, according to the seal structure of the present invention, in addition to the effect of the invention according to the third aspect, it is possible to enjoy the effect of being able to secure excellent sealing performance between the inner member and the outer member. it can.

[Brief description of drawings]

FIG. 1 is a front view of a seal member that is an embodiment of the present invention.

FIG. 2 is a front sectional view of a seal member according to an embodiment of the present invention.

FIG. 3 is a front cross-sectional view of a molding die for an inner member that constitutes a seal member that is an embodiment of the present invention.

FIG. 4 is a front cross-sectional view of a mold for an outer member that constitutes a seal member that is an embodiment of the present invention.

FIG. 5 is a front sectional view of an electromagnetic pickup sensor having a seal structure according to an embodiment of the present invention.

FIG. 6 is an enlarged view of a seal structure according to an embodiment of the present invention.

FIG. 7 is a front view of an inner member that constitutes a seal member that is a second embodiment of the present invention.

FIG. 8 is a front view of an inner member that constitutes a seal member that is a third embodiment of the present invention.

FIG. 9 is a front view of an inner member that constitutes a seal member according to a fourth embodiment of the present invention.

FIG. 10 is a front view of an inner member that constitutes a seal member that is a fifth embodiment of the present invention.

FIG. 11 is a front view of an inner member that constitutes a seal member that is a sixth embodiment of the present invention.

FIG. 12 is a front view of an inner member that constitutes a seal member according to a seventh embodiment of the present invention.

[Explanation of symbols]

10 seal member 12, 50, 52, 54, 56, 58, 60 inner member 12a, 50a, 52a, 54a, 56a, 58a, 6
0a through hole 12b, 12c, 50b, 50c, 52b to 52d, 5
4b to 54d, 56b, 56c, 58b, 58c, 60
a, 60b Protrusions 12d, 50d, 52e, 54e, 56d Slit 14 Outer member 60c Small diameter portion

Claims (4)

[Claims] 1. A seal member, comprising: a protrusion inserted into an inner wall of a through hole for ensuring a sealing property between a member inserted into the through hole and an inner wall of the through hole; A seal member comprising a diameter expanding means for facilitating expansion of the diameter of the hole. 2. The seal member according to claim 1, wherein the diameter expanding means has a slit provided on a wall surface of the through hole. 3. The seal member according to claim 1, wherein the diameter expanding means and the protrusion are provided on an inner member, and an outer member that covers the inner member from the outside is provided. Element. 4. A seal structure using the seal member according to claim 3, wherein an outer member is molded outside the inner member.