JP2012114052A - Waterproof structure between connector and casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure between a connector having improved insertability and a casing without causing complication of a housing and a seal member.SOLUTION: The lower end of a seal member 2 abuts on a support part 11a, and a skirt part 21 thereof is engaged with a projecting part 11b. An engagement hole 31 is composed of two bored holes, and a first bored hole 31a has diameter dimensions larger than those of a second bored hole 31b in an X-direction and a Y-direction. The first bored hole 31a is larger than an outline formed by connecting the outermost peripheral surface of the seal member 2. The under surface of a flange part 10 is brought into close contact with a front wall 30 of the casing 3 made of aluminum in an engaged state so as to be positioned in an engagement direction. A side face 110a on a support part engagement side is positioned on the side short of a level difference part of the engagement hole 31, a peripheral side face 110a' of the support part faces the inner peripheral surface of the first bored hole 31a so as to be positioned in the X-direction and the Y-direction. The seal member 2 on the peripheral surface of a cylindrical part uniformly is in uniform contact with the inner peripheral surface of the second bored hole 31b over the circumferential direction to exhibit waterproofness.

Description

The present invention relates to a waterproof structure between a connector and a housing.

Waterproof connectors that prevent rainwater and dust from entering and ensure the reliability of the connection portion at a high level are used in a wide range of fields such as automobiles and home appliances. As a waterproof structure of a connector, a structure in which a sealing member made of an elastic material is attached to a connection portion of a male connector housing and a gap between fitting portions is sealed is generally widely known. Means for fixing a sealing member for securing a waterproof function at a predetermined position has been reported.

For example, according to the technique described in Patent Document 1, there is a cylindrical portion that protects female terminals aligned in one direction, and a seal member is mounted on the peripheral surface of the cylindrical portion. A fixing member prepared separately is used to hold the lens.

Further, according to the technique described in Patent Document 2, an annular seal member is mounted in a female connector housing. A flange portion is provided on the outer peripheral portion of the seal member, and a perforation is provided on the flange portion. The connector housing side engaging protrusion provided at the corresponding position is related to the perforation, thereby preventing the seal member from coming off.

Japanese Patent Application No. 2000-2663 Japanese Utility Model Publication No. 5-11354

However, the method described in Patent Document 1 requires a member for fixing the seal member separately even if waterproofness can be ensured, which increases the number of parts, the number of man-hours, and further complicates and enlarges the connector housing. Invite. Further, in the method described in Patent Document 2, a flange portion extending outward is newly formed to fix the seal member, and a wall surface corresponding to the flange portion is newly formed on the connector housing side. The engagement protrusion is newly formed, and both the connector housing and the seal member are complicated in shape and increased in size. Further, in the methods described in Patent Document 1 and Patent Document 2, since the sealing surface secures the waterproof property by filling the joint surface between the male and female connector housings with the seal member, the seal member acts as an obstacle to the entry of the male connector housing. As a result, workability (insertability) cannot be denied.

The present invention has been made in view of the above problems, and has a waterproof structure between a connector and a casing that has improved waterproofness without reducing insertability, without complicating and increasing the size of a connector housing and a seal member. Is intended to provide.

In order to solve the above-mentioned problems, the present invention adopts a structure in which a seal member is mounted between the joint surfaces, and the fitting hole is composed of a plurality of perforations having different cross-sectional sizes, and is provided on the inlet side of the fitting hole. The perforations are configured to be larger than the back side perforations.

With such a configuration, a waterproof structure with improved connector insertability is provided without complicating and increasing the size of the connector housing and the seal member.

More specifically, the present invention provides the following.
(1) The waterproof structure of the connector and the housing of the present invention includes a base portion that fixes and arranges conductive terminals in at least one row direction, a cylindrical portion that surrounds the terminal, with the base portion serving as a base end and an open end. A connector provided on a peripheral surface near the base end portion of the cylindrical portion, and a flange portion for fixing the connector, and a fitting hole that fits into the cylindrical portion is provided on a side surface, and the circuit board is accommodated therein. And a sealing member made of an elastic material along the circumferential direction so as to fill a gap between the joint surface between the peripheral surface of the cylindrical portion and the inner peripheral surface of the fitting hole. The peripheral surface of the cylindrical portion is provided with a support portion for supporting one end surface of the seal member, and the seal member is displaced along the fitting direction when the connector is fitted into the fitting hole of the housing. This is characterized in that the support part regulates the above.

The present invention relates to a waterproof structure between joint surfaces of a connector and a housing. The connector includes a base portion that fixes and arranges conductive terminals in at least one row direction, a cylindrical portion that surrounds the terminal with the base portion as a base end and an open end, and an outer peripheral surface near the base end portion of the cylindrical portion. Provided with a flange for fixing the connector, which corresponds to both so-called male and female connectors. The present invention relates to a waterproof structure between the joint surfaces of the male or female connector and the housing.

Since the connector includes a sealing member made of an elastic material along the circumferential direction so as to fill a gap between the joint surface between the peripheral surface of the cylindrical portion and the inner peripheral surface of the fitting hole, The joint surface with the fitting hole is waterproof. The seal member is made of an elastic material, and may be natural rubber, synthetic rubber, or thermoplastic elastomer.

Since the peripheral surface of the cylindrical portion is provided with a support portion for supporting one end surface of the mounted seal member, movement of the seal member during fitting in the fitting direction is restricted by the support portion, and an unnecessary position is provided. Without any deviation, it is provided at a predetermined position and exhibits its original waterproof performance.

The support portion prevents the seal member attached to the cylindrical portion from being dragged by friction with the inner peripheral surface of the fitting hole during fitting and being displaced in the fitting direction. The shape may be obtained at the same time as molding. The shape may be a ridge shape, a partition shape, a block shape, or the like.

The casing is provided with a fitting hole for receiving the cylindrical portion on the side surface, and accommodates the circuit board therein, and blocks the circuit board from rainwater and dust. Cases include metal products such as aluminum alloys and non-metallic synthetic resin products in consideration of heat resistance, water resistance, and the like.

(2) Preferably, in the waterproof structure of the connector and the housing, the fitting hole of the housing includes at least two perforations having different vertical cross-sectional shapes in the fitting direction, and the first perforation is compared with the second perforation. The cross-sectional shape is large, and the first perforation is described in (1) characterized in that the first perforation is provided closer to the inlet side than the large two perforations.

The fitting hole of the housing includes at least two perforations having different sizes on the entrance side and the back side. Since the perforation on the inlet side is larger than the perforation on the back side, a large clearance is formed between the joint surfaces with the peripheral surface of the cylinder portion. Since the large clearance functions as an appropriate guide at the insertion stage in the initial stage of fitting, the connector is smoothly inserted.

The seal member of the present invention has a structure that is attached to the peripheral surface of the cylindrical portion and is held at a middle position along the fitting direction of the cylindrical portion. Since the sealing member is held in the middle of the cylindrical portion, the size of the perforation on the inlet side of the mating mating fitting hole can be increased.

(3) Preferably, the waterproof structure of the connector and the housing is described in (2) characterized in that the seal member is in contact with the second perforation and the support portion is in contact with the first perforation. .

Since the seal member is in contact with the second perforation and the support portion is in contact with the first perforation, the seal between the joint surfaces of the cylinder portion and the fitting hole is made by the second perforation on the back side of the fitting hole, and is fitted with the cylinder portion. Positioning with the hole is performed by the first hole on the inlet side of the fitting hole. Function sharing is performed for each perforation.

Positioning of the tube portion and the fitting hole is performed between the support portion and the first perforation, and since both are rigid bodies such as synthetic resin, the positioning is more accurate than when an elastic body is interposed.

Since the sealing is performed by the second perforation, the first perforation corresponding to the inlet side can have a larger cross-sectional shape than the second perforation, and when the tube portion is inserted into the fitting hole, the first perforation is Serves as a guide.

(4) Preferably, in the waterproof structure of the connector and the housing, the shape of the seal member projected on the projection plane orthogonal to the fitting direction is the same as that of the support portion provided on the peripheral surface of the cylinder portion. (3) It has a characteristic in the place which fits inside the virtual peripheral surface shape of the support part formed by connecting the peripheral side surfaces.

Since the outer shape of the sealing member is smaller than the virtual peripheral surface shape of the support portion, when the cylindrical portion of the connector is inserted into the housing fitting hole, the first perforated inner peripheral surface on the fitting hole entrance side hinders the insertion operation of the sealing member. It can be fitted without becoming.

(5) Preferably, in the waterproof structure of the connector and the housing, the seal member includes a seal portion and a skirt portion extending from one end of the seal portion, and the seal portion is at least along the circumferential direction. A ridge formed with one ridge, and when the seal member is mounted on the cylinder, the skirt and the peripheral surface of the cylinder correspond to a corresponding portion, one of which is an engaging protrusion. Is provided, and the other is provided with an engagement hole for engagement, and is characterized in that it is described in one of (1) to (4).

Since the seal portion includes a ridge portion in which at least one ridge is formed, a high waterproof property can be ensured by this flexible ridge portion following the shape of the inner peripheral surface of the fitting hole.

Since the engaging portion of the skirt portion engages with the engaging portion of the cylindrical portion peripheral surface, the seal member is held at a predetermined position on the peripheral surface of the cylindrical portion, and does not come off or shift in position.

(6) Preferably, the waterproof structure of the connector and the housing is as described in (5) characterized in that the protruding portion has a tapered surface on the side surface on the mounting direction side of the seal member.

Since the protruding portion has a tapered surface on the side surface in the mounting direction of the skirt portion, the sealing member can be easily mounted.

(7) Preferably, the waterproof structure of the connector and the housing is the one described in (5) or (6), wherein the protrusion has a protrusion-shaped flange on the side surface opposite to the tapered surface. is there.

Since the protruding portion includes a flange portion on the side surface opposite to the tapered surface, the protruding portion is unlikely to come off from the tube portion even if an external force acts on the sheet member.

According to the present invention, it is possible to obtain a waterproof structure between a connector and a housing that is less likely to cause a positional shift of the seal member and has good insertability.

1A and 1B are external views showing a waterproof structure of a connector and an aluminum housing according to the present invention, wherein FIG. 1A is an exploded perspective view and FIG. 1B is an assembled perspective view. FIG. 2 is an external perspective view of a connector equipped with a seal member according to the present invention and an aluminum housing fitted thereto. FIG. 3 is an external perspective view showing a process of attaching the seal member to the connector according to the present invention, where (A) is before attachment, (B) is in the middle of attachment, and (C) is a view of completion of attachment. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 (B) showing the fitting of the connector fitted with the seal member according to the present invention and the aluminum casing, and FIG. 4 (A) is before fitting. (B) is a figure of a regular fitting posture. FIG. 5 is an enlarged view of the periphery (one side) of the seal member of FIG. 4, (A) is before fitting, (B) is in the middle of fitting, and (C) is a normal fitting posture. FIG. 6 is a cross-sectional view showing the process of separating the connector according to the present invention from the aluminum housing, and is an enlarged cross-sectional view showing the periphery where the protrusion is engaged with the skirt portion of the seal member. FIG. 7 is an external perspective view of a connector according to another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1A and 1B are external views showing a waterproof structure of a connector and an aluminum casing according to the present invention. FIG. 1A is an exploded perspective view, and FIG. 1B is an assembled perspective view. FIG. 2 is an external perspective view of a connector equipped with a seal member according to the present invention and an aluminum casing fitted thereto. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1B showing the fitting between the connector equipped with the seal member according to the present invention and the aluminum casing, and FIG. (B) is a figure of a regular fitting posture. Here, the instruction direction is defined so that the direction instructed during the explanation becomes clear. The direction corresponding to the direction in which the connector is fitted into the aluminum housing is defined as the first direction D1, and the direction opposite to the first direction is defined as the first 1 'direction D1'. As shown in FIG. The direction, especially the upward direction is X1, the downward direction is X1 ', the front-rear direction is Y direction, especially the front direction is Y1, and the back direction is Y1'.

(Waterproof structure)
The waterproof structure between the connector and the aluminum casing according to the embodiment of the present invention is attached to the connector housing 1, the aluminum casing 3, and the joint surface thereof, as shown in FIGS. The seal member 2 is configured.

[Connector housing]
As shown in FIGS. 1, 2, and 4, the connector housing 1 includes a base portion 13 that fixes the terminal 15, a cylindrical portion 11 that protects the terminal 15 from deformation, and a connector housing 1. It is comprised from the collar part 10. The base 13 includes terminal holding holes (not shown) for arranging the terminals 15 in one row or two or more rows. The tube portions 11 and 12 stand upright so as to surround the alignment terminals 15 with the base portion 13 as a base end. The cylinder portion 11 is provided from the base portion 13 along the first direction D1. The cylindrical portion 12 is provided along the first ′ direction D1 ′ from the base portion 13. The flange portion 10 bulges outward from the peripheral surface near the joint between the two cylindrical portions 11 and 12, and is a substantially ellipsoid having a short diameter in the X direction and a long diameter in the Y direction. The flange portion 10 includes screw holes 10a and 10a at both ends in the Y1 direction and the Y1 ′ direction. The screw holes 10 a and 10 a are for fixing the connector 1 to the aluminum housing 3.

[Aluminum enclosure]
As shown in FIGS. 1 and 2, the aluminum casing 3 is a box die-cast product for accommodating an electronic control unit (not shown). In order to ensure confidentiality, the opening is screwed through a seal rubber (not shown). It is generally mounted in the engine room of a car. The built-in electronic control unit is connected to an external electrical signal and power supply circuit through a connector. A connector connection fitting hole 31 is provided at the center of the front wall 30. The thickness of the front wall 30 is a structure having substantially the same thickness as the length of the cylindrical portion 11. In order to maintain the normal operating environment of the electronic control unit, the connection between the connector housing 1 and the aluminum housing 3 is required to be highly waterproof. Therefore, the seal member 2 is mounted in the fitting hole 31. The connector housing 1 is screwed to the aluminum housing 3 via the seal member 2. The aluminum housing 3 includes screw holes 30a and 30a for the both ends of the fitting hole 31 in the Y1 direction and the Y1 ′ direction.

(Seal member)
As shown in FIGS. 1, 2, and 4, the seal member 2 is attached to the peripheral surface of the cylindrical portion 11 of the connector housing 1, and is molded into a shape conforming to the contour shape of the peripheral surface of the cylindrical portion 11. It is a substantially rectangular annular body. The seal member 2 includes a seal portion 20 and a skirt portion 21. The seal portion 20 is composed of a ridge portion 20a in which two ridges are formed in parallel along the circumferential direction. The outer periphery of the ridge portion 20a is crushed to exhibit the waterproofness of the joint surface. The two protrusions 20a are arranged in parallel to improve waterproofness.

As shown in FIGS. 1 and 2, the skirt portion 21 extends from the lower end (first ′ direction D1 ′) of the seal portion 20 in the first ′ direction D1 ′. In the present embodiment, the skirt portion 21 is provided at each corner of the substantially rectangular seal portion 20. The skirt portion 21 has a sheet shape that is thinner than the seal portion 20 and easily deformable. The skirt portion 21 includes an engagement hole 21a for holding the seal member 2 in a predetermined area when the seal member 2 is mounted on the cylinder portion 11.

As shown in FIG. 4, the seal member 2 is preferably a deformable elastic body because the outer peripheral portion is crushed to ensure waterproofness of the joint surface. Generally, elastic materials such as natural rubber, synthetic rubber, and thermoplastic elastomer are used. Silicone rubber may be selected in consideration of heat resistance, weather resistance and the like.

[Installation of seal member]
FIG. 3 is an external perspective view showing a process of attaching the seal member to the connector according to the present invention, where (A) is before attachment, (B) is in the middle of attachment, and (C) is a view of completion of attachment. FIG. 6 is a cross-sectional view showing the process of separating the connector according to the present invention from the aluminum housing, and is an enlarged cross-sectional view showing the periphery where the protrusion is engaged with the skirt portion of the seal member.

As shown in FIGS. 3 and 6, the seal member 2 is mounted in the first ′ direction D <b> 1 ′ from the distal end side of the cylindrical portion 11. The sealing member is attached by passing the hollow portion of the annular sealing member 2 through the cylindrical portion 11. The seal member 2 is attached to the tube portion 11 from the skirt portion 21. The seal member 2 heads toward the deep portion so that the inner peripheral surface is rubbed lightly with the peripheral surface of the cylindrical portion 11 ((A) in FIG. 3).

The tip of the skirt portion 21 in the first ′ direction D <b> 1 ′ abuts on the protruding portion 11 b provided on the circumferential surface of the cylindrical portion 11 at a point about half of the mounting operation. The protruding portion 11b is in contact with the tip of the skirt portion 21 at the tapered surface 111b, and the skirt portion 21 slides on the protruding portion 11b along the tapered surface 111b with the mounting operation ((B) of FIG. 3).

When the seal member 2 is mounted at a predetermined position, the engagement hole 21a of the skirt portion 21 is engaged with the projection portion 11b. A protrusion 110b is provided at the tip of the protrusion 11b to ensure engagement,
The skirt portion 21 is adjusted to the position of the protruding portion 11b so as to get over the collar portion 110b ((C) in FIG. 3).

When the seal member 2 is mounted on the cylinder portion 11 in the correct mounting posture, the edge portion in the first ′ direction D1 ′ of the seal portion 20 abuts on the fitting side surface 110a of the support portion 11a provided on the cylinder portion 11 ( (C) of FIG.

As shown in FIGS. 3 and 6, the seal member 2 mounted in the correct posture as described above has the edge portion in the first ′ direction D1 ′ of the seal portion 20 abutting against the fitting side surface 110a of the support portion 11a. The engaging hole 21 a of the skirt portion 21 is engaged with the protruding portion 11 b provided in the cylindrical portion 11.

[Connector mating]
4 is a cross-sectional view taken along the line IV-IV in FIG. 1 (B) showing the fitting of the connector equipped with the sealing member according to the present invention and the aluminum casing, and (A) is before fitting. (B) is a figure of a regular fitting posture. In order to clearly define the direction, the vertical direction of the drawing in the direction orthogonal to the fitting direction D1 is the X direction, in particular, the upper direction is X1, the lower direction is X1 ', and the front and rear direction is the Y direction. In particular, the front direction is Y1, and the rear direction is Y1 ′.

As shown in FIG. 4, the connector housing 1 is fitted into the aluminum housing 3 in such a posture that the tip of the cylindrical portion 11 faces the fitting hole 31 of the aluminum housing 3.

The fitting hole 31 of the aluminum casing 3 has a substantially rectangular shape in which the vertical cross-sectional shape along the first direction D1 corresponds to the shape of the cylindrical portion 11. As illustrated in FIG. 4, the fitting hole 31 includes two perforations having different vertical cross-sectional shapes along the first direction D1. The two perforations are a first perforation 31a on the inlet side corresponding to the first direction D1 'and a second perforation 31b on the back side corresponding to the first direction D1. The first perforation 31a has a larger dimension in both the X direction and the Y direction than the second perforation 31b. A stepped portion 31c having a tapered surface is formed at the joint between the first perforation 31a and the second perforation 31b in order to adjust the difference in size.

As shown in FIG. 4, the vertical cross-sectional shape of the first perforation 31a along the first direction D1 is larger than the outer shape connecting the outermost peripheral surfaces of the seal member 2, and the opening of the first perforation 31a. The edge has a C-plane. Under these conditions, the cylindrical portion 11 is accurately guided to the fitting hole 31, so that the insertion operation in the initial fitting can be performed smoothly.

As shown in FIG. 4, when the insertion operation of the connector housing 1 proceeds and the top of the seal member 2 in the first direction D1 starts to be engaged with the second perforation 31b, the fitting side surface 110a of the support portion 11a becomes the first perforation 31a. Start to hang on. The support portion 11a advances while the peripheral side surface 110a ′ extending along the first direction D1 is in sliding contact with the inner peripheral surface of the first perforation 31a. The connector housing 1 assumes a normal fitting posture when the peripheral side surface 110a ′ of the support portion 11a abuts on the inner peripheral surface of the first perforation 31a and is positioned in the X direction and the Y direction. Since the positioning is performed by the support portion 11a made of a synthetic resin rigid body without taking the method of positioning by the easily deformable seal member 2, the positioning is accurately determined, and the uneven contact of the seal member 2 caused by the positional deviation is accurately determined. It can be avoided.

As shown in FIG. 4, with the connector housing 1 fully fitted into the fitting hole 31, the bottom surface of the flange portion 10 is in close contact with the surface of the front wall 30 of the aluminum housing 3, and positioning in the first direction D1 is performed. Is determined. At this time, the fitting side surface 110 a of the support portion 11 a is positioned in front of the step portion 31 c of the fitting hole 31. Further, the peripheral side surface 110a 'of the support portion abuts on the inner peripheral surface of the first perforation 31a, and positioning in the X direction and the Y direction is determined. At this time, the peripheral surface of the cylindrical portion 11 overlaps with the inner peripheral surface of the fitting hole 31, and the seal member 2 mounted on the peripheral surface of the cylindrical portion 11 is elastically applied to the inner peripheral surface of the second perforation 31b in the circumferential direction. Contact and fill the gap between both joint surfaces uniformly.

As shown in FIG. 1, the connector housing 1 is fixed by a screw tightening portion provided in the flange portion 10 in a normal fitting posture, and the normal fitting posture is maintained with respect to the aluminum casing.

As described above, since the seal member 2 is uniformly deformed, a concentrated load is not partially applied, and the waterproof property is hardly lowered due to secular deterioration due to uneven contact.

[Deformation of seal member during mating operation]
5A and 5B are enlarged views of the periphery (one side) of the seal member in FIG. 4, (A) before fitting, (B) in the middle of fitting, and (C) in the normal fitting posture.

As shown in FIG. 5, the seal member 2 includes a protruding portion 20 a formed with two protrusions on the seal portion 20. There is a gap between the peripheral surface of the cylindrical portion 11 and the inner peripheral surface of the second perforation 31b. The seal member 2 ensures the waterproofness between the joint surfaces by filling the gap between the both surfaces.

The rear end portion of the seal portion 20 in the first direction D1 ′ is in contact with the fitting side surface 110a in the first direction D1 of the support portion 11a, as shown in FIG. Before the tube portion 11 is inserted into the fitting hole 31 at the initial stage of insertion, the tube portion 11 is inserted into the fitting hole 31 about half of the entire length. The seal part 20 is located in the first perforation 31a. The protrusion 20a has a clearance with the inner peripheral surface of the first perforation 31a at the top. The support portion 11 a is located in front of the fitting hole 31. As described above, since the connector housing 1 and the attached seal member 2 do not have a portion in sliding contact with the inner peripheral surface of the fitting hole 31, the first perforation 31a functions as an appropriate guide and smoothly fits at the initial stage of insertion. To do.

During the middle of insertion, as shown in FIG. 5B, the protrusion located in the first direction D1 of the protrusion 20a of the seal portion 20 is the inner peripheral surface of the second perforation 31b. It is elastically touching. The peripheral side surface 110a ′ of the support portion 11a is at a position corresponding to the inner peripheral surface of the first perforation 31a. There is a clearance between the peripheral side surface 110a 'and the inner peripheral surface of the first perforation 31a. The normal posture of the cylindrical portion 11 of the connector housing 1 with respect to the fitting hole 31 is forced by the contact between the peripheral side surface 110a ′ of the support portion 11a and the first perforation 31a. Therefore, the protruding portion 20a of the seal member 2 that is elastically deformed by contacting the second perforation 31b at the same time can be uniformly deformed in the circumferential direction.

As shown in FIG. 5C, when the insertion is in the normal fitting posture, the two ridges of the ridge portion 20a of the seal portion 20 are in elastic contact with the inner peripheral surface of the second perforation 31b. ing. The peripheral side surface 110a 'of the support portion 11a is in contact with the inner peripheral surface of the first perforation 31a, and the corner portion in the first direction D1 is in contact with the step portion 31c. The lower surface of the flange 10 is in contact with the front wall 30 of the aluminum casing 3. The positioning of the first direction D1 is determined by the abutment of the flange 10 on the front wall 30.

Thus, the gap between the joint surfaces of the peripheral surface of the cylinder part 11 and the inner peripheral surface of the fitting hole 31 is filled with the seal member 2 accurately. The positioning is accurate because it is performed by the rigid support portion 11a made of synthetic resin. In addition, the water entry path is provided with a plurality of bent portions, and the sealing member 2 is located far from the entrance, so that the waterproof function is further enhanced.

(Engagement of seal member)
FIG. 6 is a cross-sectional view showing a process of separating the connector according to the present invention from the aluminum casing, and is an enlarged cross-sectional view showing the periphery where the protrusion is engaged with the skirt portion of the seal member.

As shown in FIG. 6, in a posture in which the connector housing 1 is fitted to the aluminum housing 3, the protrusion 20a of the seal member 2 is elastically contacted with the inner peripheral surface of the second perforation 31b, and the protrusion 20a is crushed. It is a state that has been.

When the connector housing 1 is separated from the aluminum housing 3, the seal member 2 is dragged to the inner peripheral surface of the second perforation 31b by the projecting ridge portion 20a and is released from the cylindrical portion 11 (first direction D1). It is displaced to. The displacement is made elastically.

As shown in FIG. 6, the seal member 2 is engaged when the connector housing 1 is separated from the aluminum housing 3 by engaging the protrusion 11 b provided on the peripheral surface of the cylindrical portion 11 with the skirt portion 21. The seal member 2 returns to its original state due to a restoring force. The protrusion 11b is provided with a flange 110b to make the engagement of the seal member 2 more reliable.

By such means, the seal member 2 is engaged with the protrusion 11b, elastically restored to the displacement at the time of separation, and maintains the original state. By this function, the possibility that the seal member 2 is displaced from a predetermined position of the cylindrical portion 11 or detached from the cylindrical portion 11 is greatly reduced.

[Function and effect]
The waterproof structure between the connector and the aluminum casing of this embodiment is as described above, and has the following effects. (1) Since the gap between the joint surfaces of the peripheral surface of the cylindrical portion and the inner peripheral surface of the fitting hole is uniformly filled with the seal member 2, waterproofness between the joint surfaces is ensured.

(2) The positioning is accurate because it is performed by a rigid support portion made of synthetic resin.

(3) Since the water entry path has a plurality of bent portions and the seal member 2 is located far from the entrance, the waterproof function is enhanced.

(4) Since the cylindrical portion is fitted into the fitting hole in a state where the side surface of the support portion is in contact with the inner peripheral surface of the fitting hole, rattling of the connector is reduced.

(5) The seal member is mounted on the peripheral surface of the cylinder part and has a waterproof structure that fills the gap with the inner peripheral surface of the fitting hole, so it is lower in height than the waterproof structure in which the seal member is mounted on the bottom surface of the flange of the connector housing. Is possible.

(6) Since the movement of the sealing member in the fitting direction is restricted by the support portion, the risk of a decrease in the waterproof effect due to the positional deviation is reduced.

(7) Since the seal member is engaged with the protruding portion of the tube portion at the skirt portion, it is difficult for the seal member to be detached from the tube portion during the connector separation operation.

(8) Since the protrusion has a tapered portion on the mounting side of the seal member, the mounting resistance is alleviated when the seal member is inserted.

(9) The fitting hole is composed of a first perforation and a second perforation having different sizes. Since the larger first perforation is on the inlet side, the connector can be easily inserted and the risk of damaging the seal member is reduced. Is done.

While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the inventive idea.

For example, as shown in FIG. 7, the support portion 1100 a may have a structure extending from the surface of the flange portion 10. Even in such an embodiment, the effects (1) to (9) described above can be obtained.

DESCRIPTION OF SYMBOLS 1 Connector housing 10 ridge part 10a screw hole 11 cylinder part 11a support part 110a fitting side surface 110a 'peripheral side surface 11b protrusion part 110b collar part 111b taper surface 11c cavity part 12 cylinder part 13 base part 15 terminal 16 screw 2 seal member 20 seal Part 20a Projection part 21 Skirt part 21a Engagement hole 3 Aluminum housing 30 Front wall 31 Engagement hole 31a First perforation 31b Second perforation 31c Stepped part

Claims (7)

A base for fixing and arranging conductive terminals in at least one row direction;
This base portion is the base end, the tip portion is open, the tube portion surrounding the terminal,
A collar portion for fixing the connector provided on the peripheral surface near the base end portion of the cylindrical portion,
A connector comprising:
Provided on the side surface with a fitting hole that fits into the cylindrical portion,
It is a waterproof structure with a housing that houses a circuit board inside,
A seal member made of an elastic material is provided along the circumferential direction so as to fill a gap between the joint surface between the peripheral surface of the cylindrical portion and the inner peripheral surface of the fitting hole,
A peripheral portion of the cylindrical portion is provided with a support portion for supporting one end surface of the seal member,
A waterproof structure of a connector and a casing, characterized in that the support portion restricts the displacement of the seal member along the fitting direction when the connector is fitted into the fitting hole of the housing. The fitting hole of the housing includes at least two perforations having different vertical cross-sectional shapes in the fitting direction, and the first perforation has a larger cross-sectional shape than the second perforation, and the first perforation is larger than the second perforation. The waterproof structure of the connector and the housing according to claim 1, wherein the waterproof structure is provided on the inlet side. The waterproof structure of the connector and the housing according to claim 2, wherein the seal member is in contact with the second perforation, and the support portion is in contact with the first perforation. The shape of the seal member projected on the projection plane orthogonal to the fitting direction is
The waterproof structure of the connector and the housing according to claim 3, wherein the waterproof structure is located within the virtual peripheral surface of the support portion formed by connecting the peripheral side surfaces of the support portion provided on the peripheral surface of the cylindrical portion. The seal member includes a seal portion;
A skirt portion extending from one end of the seal portion,
The seal portion includes a ridge that forms at least one ridge along the circumferential direction,
When the seal member is mounted on the cylindrical portion, the corresponding portion of the skirt portion and the peripheral surface of the cylindrical portion is provided with an engaging projection portion on one side and an engaging hole portion for engagement on the other side. The waterproof structure of the connector and the housing according to claim 1, wherein the waterproof structure is provided. The waterproof structure of the connector and the housing according to claim 5, wherein the protrusion has a tapered surface on a side surface on the mounting direction side of the seal member. The waterproof structure of the connector and the housing according to claim 5 or 6, wherein the protrusion has a flange on a side opposite to the surface having the tapered surface.

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