JP6328981B2 - Seal member - Google Patents

Description

  The present invention relates to a watertight seal member inserted between an electric wire and an insertion hole into which the electric wire is inserted.

  When inserting an electric wire into the insertion hole of the housing, or when inserting the end of an electric wire with crimped terminals into the terminal insertion hole of a waterproof connector, etc. A water-tight rubber seal member is inserted between the terminal and the terminal insertion hole.

  This type of seal member has a cylindrical shape, and the seal member is provided with a lip that elastically contacts the inner peripheral surface of the insertion hole into which the seal member is inserted, or is inserted into the through hole of the seal member. A lip that elastically contacts the outer peripheral surface of the electric wire protrudes from the inner peripheral surface of the through hole. Such a seal member is inserted into the insertion hole of the housing as a single unit, or is protruded from a thick plate-shaped mat seal and inserted into a wire drawing portion of the waterproof connector.

  The above-described seal member, particularly when a lip is provided, allows the lip to be elastically deformed and compressed in the radial direction of the seal member by insertion into the insertion hole or insertion of the electric wire, so that the inner peripheral surface of the insertion hole or the electric wire It exerts a sealing function by obtaining an elastic contact force with respect to the outer peripheral surface.

  The present applicant has previously proposed a crushing rate and a crushing amount of a waterproof rubber plug that can ensure sealing performance and insertability to the housing insertion hole when the radial thickness of the sealing member cannot be secured sufficiently. (For example, Patent Document 1).

JP 2003-272758 A

  In the above-described proposal, the sealing performance can be maintained by securing a certain amount of crushing of the waterproof rubber plug while securing the insertion property into the insertion hole by suppressing the crushing rate of the waterproof rubber plug. However, when this is applied to a seal member provided with a lip, the crushed portion concentrates exclusively on the lip portion, so that the lip portion has a corresponding compression ratio.

  Therefore, for example, a seal member used in an environment where a lip portion having a high compressibility is likely to be permanently deformed due to compression set due to heat, such as a seal member used in a high temperature environment such as an engine room of a vehicle. Some measures are necessary for the deterioration of the sealing performance due to.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high temperature environment when watertightly sealing between a wire and an object into which the wire is inserted by elastic deformation of a lip portion of a seal member. An object of the present invention is to provide a sealing member that can exhibit a long sealing performance even underneath.

In order to achieve the above object, the sealing member of the present invention described in claim 1 comprises:
In the sealing member for watertight sealing between the object wire as the wire is inserted,
A through hole through which the electric wire is inserted;
Is bulged formed from the inner peripheral surface of the front SL through-hole, a lip portion which extends annularly around the penetrating direction of the through hole,
And an annular recess formed on the surface of the portion excluding the front end in the bulging direction of the lip portion of the lip portion,
The annular recess is formed in the same shape at two locations on the concentric circle of the same diameter with respect to the through-hole on the surface of the lip portion .

  According to the sealing member of the present invention described in claim 1, when the electric wire is inserted through the through hole, a reaction force from the distal end to the proximal end in the bulging direction of the lip portion is applied from the electric wire to the lip portion. Due to this reaction force, the lip portion tends to be deformed so that the distal end side and the proximal end side of the lip portion sandwiching the annular recess approach each other in the bulging direction of the lip portion.

  Further, when the annular recess is formed in the lip portion, the area of the pressure receiving surface of the seal member that receives the pressure of the surrounding atmosphere is increased in the annular recess portion compared with the case where the annular recess is not formed. And the pressure of the atmosphere around the sealing member applied to the annular recess acts in the normal direction of the surface of the annular recess toward the inside of the lip portion.

  For this reason, the pressure in the ambient atmosphere around the lip portion applied to the annular recess works against the reaction force from the electric wire, and works to alleviate the deformation in which the distal end side and the proximal end side of the lip portion sandwiching the annular recess approach.

  Therefore, when watertight sealing is performed by deformation of the lip portion where the electric wire of the sealing member is pressed between the electric wire and the object into which the electric wire is inserted, the amount of compression of the lip portion that causes compression set is reduced, Even in a high-temperature environment, the sealing property can be exhibited for a long time.

In the sealing member of the present invention described in 請 Motomeko 1, two annular recesses present on concentric circles of the same diameter to the through hole, the through direction of the through-holes across the tip of the inner bulging direction on the surface of the lip It will be located on both sides of each.

  Therefore, the force that opposes the reaction force applied to the lip part from the lip part contact partner (wire or insertion hole) from the symmetrical position on both sides in the penetration direction of the through hole across the tip of the lip part is symmetric. Will act in different directions and sizes.

  For this reason, the deformation of the lip portion can be relieved in the same manner at two locations on both sides of the tip of the lip portion, and the lip portion whose deformation has been relieved can be restored to a shape closer to the original shape. Thereby, it can be avoided that the lip portion continues to be inserted between the electric wire and the insertion hole in a state in which the compressive force causing the compression set is locally generated in a part.

The sealing member of the present invention described in claim 2 is the sealing member of the present invention as set forth in claim 1, wherein the annular recess has an arcuate profile in cross-section crossing the circumferential direction of the annular recess It is characterized by.

According to the seal member of the present invention described in claim 2 , in the seal member of the present invention described in claim 1 , the periphery of the seal member acting in the normal direction of the surface of the annular recess toward the inside of the lip portion With the pressure from the atmosphere, the portion in the vicinity of the annular recess of the lip portion is pressed radially with an equal force toward the inside of the lip portion.

  For this reason, the direction which relieves the compressive force which acts on a lip | rip part with the pressure from the surrounding atmosphere of a lip | rip part contains more directional components, and can relieve | compress the compressive force of more directions.

The sealing member of the present invention described in claim 3 is the sealing member of the present invention as set forth in claim 1 or claim 2, wherein the object is a housing having a interpolation in hole, in an outer circumferential surface It has a lip portion that is bulged and pressed into the inner peripheral surface of the insertion hole and in which the annular recess is formed .

According to the seal member of the present invention described in claim 3 , in the seal member of the present invention described in claim 1 or claim 2 , the lip portion from the insertion hole when the seal member is inserted into the insertion hole of the housing. The pressure of the ambient atmosphere around the lip portion applied to the annular recess counteracts the reaction force against the lip portion, and works to alleviate deformation in which the distal end side and the proximal end side of the lip portion sandwiching the annular recess approach.

  Therefore, the amount of compression of the lip portion that causes compression set is reduced when the wire and the insertion hole of the housing into which the wire is inserted are sealed in a watertight manner by deformation of the lip portion where the insertion hole of the seal member is pressed. It can be reduced so that the sealing performance can be exhibited for a long time even in a high temperature environment.

  According to the present invention, when sealing between a wire and an object into which the wire is to be inserted in a watertight manner by elastic deformation of the lip portion of the seal member, a long sealing performance can be exhibited even in a high temperature environment. Can be.

It is a partially cutaway perspective view showing a waterproof rubber stopper to which the present invention is applied. It is a partially cutaway perspective view showing a mat seal to which the present invention is applied. FIG. 3 is a partially cutaway perspective view showing a seal member according to an embodiment of the present invention applied to the waterproof rubber plug of FIG. 1 and the mat seal of FIG. 2. It is an expanded sectional view of the lip | rip part of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. First, an application target of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a partially cutaway perspective view showing a waterproof rubber stopper. A waterproof rubber plug 1 shown in FIG. 1 is used for watertight sealing when an electric wire (not shown) is inserted into the insertion hole 3 a of the housing 3. The waterproof rubber plug 1 has a cylindrical shape, and an electric wire (not shown) is inserted into a through-hole 1a passing through the center of the waterproof rubber plug 1, and the waterproof rubber plug 1 is inserted into the insertion hole 3a of the housing 3 in this state. Is done.

Lip portions 1d and 1e are formed to bulge on the outer peripheral surface 1b and the inner peripheral surface 1c of the waterproof rubber plug 1. These lip portions 1d and 1e extend in an annular shape around the through direction of the through hole 1a. The lip portion 1 of the outer peripheral surface 1 b is pressed against the inner peripheral surface of the insertion hole 3 a of the housing 3 and is compressed by receiving a reaction force from the housing 3. The lip 1e of the inner peripheral surface 1c is pressed against an electric wire (not shown) inserted through the through hole 1a, and compressed by receiving a reaction force from the electric wire.

  FIG. 2 is a partially cutaway perspective view showing the mat seal. The mat seal 5 shown in FIG. 2 is used for watertight sealing when inserting a terminal-attached electric wire (both not shown) into the terminal insertion hole of the connector housing of the waterproof connector. The mat seal 5 has a plate shape, and has a plurality of through holes 5a that penetrate through the thickness direction of the mat seal 5 and through which unillustrated electric wires with terminals are respectively inserted.

  The mat seal 5 is brought into contact with the surface where the terminal insertion hole is opened by aligning the position of each through hole 5a with the position of each terminal insertion hole of the connector housing (not shown), and inserting each terminal through each through hole 5a. The terminal-attached electric wires are respectively inserted into the holes.

  On the inner peripheral surface 5b of each through hole 5a of the mat seal 5, a lip portion 5c is bulged. The lip portion 5c extends in a ring shape around the through direction of the through hole 5a. The lip portion 5c is pressed against an unillustrated electric wire with a terminal inserted through the through hole 5a, and is compressed by receiving a reaction force from the electric wire with a terminal. The inner peripheral surface 5b is pressed against an unillustrated electric wire with a terminal inserted through the through hole 5a, and is compressed by receiving a reaction force from the electric wire with a terminal.

  Next, a sealing member according to an embodiment of the present invention applied to the waterproof rubber plug 1 of FIG. 1 and the mat seal 5 of FIG. 2 will be described with reference to FIGS. FIG. 3 is a partially cutaway perspective view showing a seal member according to an embodiment of the present invention. In the seal member 10 shown in FIG. 3, the water-tight seal function portion by the lip portions 1d, 1e, and 5c of the waterproof rubber plug 1 of FIG. 1 and the mat seal 5 of FIG. 2 is simplified.

The seal member 10 has a cylindrical shape, and a lip portion 10 c is formed to bulge on the inner peripheral surface 10 b of the through hole 10 a that penetrates the center of the seal member 10. The lip portion 10c extends in an annular shape around the through direction of the through hole 10a. As shown in the enlarged sectional view of FIG. 4, the lip portion 10 has a substantially isosceles triangle shape in a cross section perpendicular to the circumferential direction of the lip portion 10 a, and the lip in the bulging direction from the inner peripheral surface 10 b. The tip of the portion 10c is rounded.

  On the two oblique sides in the cross-sectional shape of the lip portion 10c, annular recesses 10d are respectively formed. Each annular recess 10d is configured by a substantially semicircular recess, and as shown in FIG. 3, the two annular recesses 10d have the same radius r from the center O of the through-hole 10a in each hypotenuse of the lip portion 10c. Each is formed on a concentric circle.

  Next, the action of the lip portion 10c of the seal member 10 of the present embodiment configured as described above will be described. When an unillustrated electric wire is inserted into the through hole 10a of the seal member 10, the electric wire comes into pressure contact with the lip portion 10c inside the through hole 10a.

  Then, a reaction force directed from the distal end to the base end (inner peripheral surface 10b of the seal member 10) in the bulging direction of the lip portion 10c is applied to the lip portion 10c from the electric wire in the through hole 10a. Due to this reaction force, the lip portion 10c tends to be deformed such that the distal end side and the proximal end side approach the annular recess portion 10d in the bulging direction of the lip portion 10c and the annular recess portion 10d is crushed.

  By the way, each hypotenuse of the lip portion 10c functions as a pressure receiving surface that receives pressure from the atmosphere around the lip portion 10c. And if the annular recessed part 10d is formed in the lip | rip part 10c like this embodiment, the pressure receiving area of a hypotenuse will increase. In addition, the direction of the pressure received from the surrounding atmosphere at each location on the surface of the annular recess 10d is a normal direction perpendicular to the tangential direction of the surface of each location of the annular recess 10d, but the direction toward the inner side of the lip portion 10c, It turns out that.

  Therefore, the lip portion 10c receives various radial pressures from the surrounding atmosphere toward the inner side of the lip portion 10c, particularly in the annular recess portion 10d where the pressure receiving area is increased, and this pressure is applied to the lip portion 10c. This counteracts the reaction force from an unillustrated electric wire in pressure contact. And since the pressure from surrounding atmosphere opposes the reaction force from an electric wire, the deformation | transformation in the annular recessed part 10d of the lip | rip part 10c by the reaction force from an electric wire is relieve | moderated.

  Therefore, by forming the annular recess 10d in the lip portion 10c, the amount of compression of the lip portion 10c that causes permanent deformation strain is reduced, and the seal member 10 is used in an environment in which high temperature permanent deformation strain is likely to occur, for example. However, it is possible to achieve a long sealing performance with an electric wire (not shown).

  And the structure of the lip | rip part 10c which formed the cyclic | annular recessed part 10d mentioned above is applicable to the lip | rip parts 1d and 1e of the waterproof rubber stopper 1 of FIG. 1, and the lip | rip part 5c of the mat seal 5 of FIG. Thereby, the sealing property with the housing 3 and the electric wire (not shown) by the lip portions 1d and 1e of the waterproof rubber plug 1 of FIG. 1, and the sealing with the electric wire with terminal (not shown) by the lip portion 5c of the mat seal 5 of FIG. Can be exhibited for a long time even in a high temperature environment.

Thus, the mat seal 5 of the waterproof rubber plug 1 and 2 in FIG. 1, similar to the sealing member 10 in FIG. 3, and the sealing member in the claims. Further, the lip portions 1d and 1e in FIG. 1 and the lip portion 5 in FIG. 2 correspond to the lip portions in the claims as in the lip portion 10c in FIG. And the housing 3 of FIG. 2 is corresponded to the target object in a claim like the electric wire and the electric wire with a terminal which abbreviate | omitted illustration in FIG.

  In the embodiment shown in FIG. 3 and FIG. 4, the case where the annular recesses 10d are respectively formed on the inclined surfaces of the lip portion 10c on the concentric circles having the same radius r from the center O of the through hole 10a has been described. . However, the annular recess 10d may be formed only on one slope of the lip portion 10c, or the position of the annular recess 10d on each slope may be a position where the distance from the center O of the through hole 10a is different.

  However, when the position of the annular recess 10d is as in the present embodiment, the annular recess 10d is located on both sides of the tip of the lip portion 10c in the bulging direction, and the pressure from the surrounding atmosphere is symmetrical to each hypotenuse. To the lip portion 10c in a symmetric direction and size.

  For this reason, the deformation | transformation of the lip | rip part 10c can be similarly relieve | moderated in two symmetrical places of the both oblique sides of the lip | rip part 10c, respectively, and the lip | rip part 10c by which the deformation | transformation was eased can be restored | restored to the shape close | similar to an original form. Thereby, it can be avoided that the lip portion 10c continues to be inserted between the electric wire and the insertion hole in a state where the compression force causing the compression set is locally generated in a part of the portion.

  In the embodiment shown in FIGS. 3 and 4, the annular recess 10 d has a substantially semicircular outline, but for example, a V-shape, a U-shape, a concave shape, a shape like a part of a regular polyhedron, etc. The annular recess 10d may be configured with a contour other than a substantially semicircular shape (arc shape).

  However, if the contour of the annular recess 10d is substantially semicircular (arc-shaped) as in this embodiment, the periphery of the seal member 10 acting in the normal direction of the surface of the annular recess 10d toward the inside of the lip portion 10c. With the pressure from the atmosphere, the portion in the vicinity of the annular recess 10d of the lip portion 10c is pressed radially toward the inner side of the lip portion 10c with a uniform force.

  For this reason, the direction which relieves the compressive force which acts on the lip | rip part 10c with the pressure from the surrounding atmosphere of the lip | rip part 10c contains more directional components, and can relieve | compress the compressive force of more directions. .

  The present invention is extremely useful when applied to a watertight seal member that seals between an electric wire and an object into which the electric wire is inserted.

1 Waterproof rubber stopper (seal member)
1a, 5a, 10a Through hole 1b Outer peripheral surface 1c, 5b, 10b Inner peripheral surface 1d, 1e, 5c, 10c Lip part 3 Housing (object)
3a Insertion hole 5 Mat seal (seal member)
5c Lip part 10 Seal member 10d Annular recess O Through hole center r Radius from the through hole center

Claims (3)

In the sealing member for watertight sealing between the object wire as the wire is inserted,
A through hole through which the electric wire is inserted;
Is bulged formed from the inner peripheral surface of the front SL through-hole, a lip portion which extends annularly around the penetrating direction of the through hole,
And an annular recess formed on the surface of the portion excluding the front end in the bulging direction of the lip portion of the lip portion,
The annular recess is formed in the same shape at two locations on a concentric circle having the same diameter with respect to the through hole in the surface of the lip portion . It said annular recess claim 1 Symbol mounting of the sealing member, characterized in that it has an arc-shaped profile in cross-section crossing the circumferential direction of the annular recess. The object is a housing having a interpolation-entry apertures,
The seal member according to claim 1 or 2 , further comprising a lip portion that bulges also on an outer peripheral surface, is pressed against an inner peripheral surface of the insertion hole, and has the annular recess .

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