JPH09320679A - Closing plug for water-proof connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily carry out insertion, prevent damage of circumferential rim parts, and improve the sealing property and the seating property by unitedly forming an elastic part in the outer circumferential face of a cylindrical main body in which an elastic auxiliary member is installed along the longitudinal axial line and which is made of an elastic material. SOLUTION: A rising part 3 comprising a plurality of circular projected part having arc-like cross section and arranged continuously is unitedly formed in the outer circumferential face of a cylindrical main body 2. An elastic auxiliary member 4 is buried unitedly in the inside of the main body 2 in the longitudinal axial line and arc-like end parts 4a, 4b of the elastic auxiliary member 4 are slightly exposed to respective end faces 2a, 2b of the main body 2, so that the end faces 2a, 2b can be reinforced and at the same time the pressure resistance in the axial direction can be improved and thus the pressure to a hollow terminal insertion hole can be applied to precisely right direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for a connector, and more particularly to a plug for a waterproof connector which is hermetically fitted in a terminal insertion hole formed in a waterproof connector for ensuring waterproofness. It is a thing.

[0002]

2. Description of the Related Art Since vehicles such as automobiles used in a natural environment have a severe use environment such as traveling in the wind and rain, it is often necessary to consider waterproofness in their electric wiring and connection. Therefore, particularly, a waterproof connector configured to prevent the entry of moisture is often used in a portion exposed to the outside world.

In the female part of such a waterproof connector, a part of the terminal insertion hole may become empty depending on the specifications, and if it is left as it is, the sealing property of the connector housing cavity cannot be ensured and a water leakage accident may occur. It has been common practice to fill a closure plug made of an elastic material.

An example of this type of plug is the "plug for waterproof connector" described in Japanese Utility Model Laid-Open No. 2-7874 as shown in FIGS. 15 to 17, the outline of which is shown in the drawings below. I will explain along. Block plug 4 shown in FIG.
1 has a structure in which a seal material 43 having a wavy cross section formed of, for example, a soft synthetic rubber or the like is covered around a hard core material 42 having a large diameter on both ends and having a bobbin shape. This block plug 4
The corrugated cross-sections at both end portions of No. 1 have a large thickness of the core material so that the thickness of the sealing material is thin. The corrugated cross-section of the center has the core material constricted and the thickness of the sealing material is thick. Demonstrate a large elastic force. Therefore, the central corrugated cross-section portion substantially provides the main sealing element when it is inserted into the empty terminal insertion hole.

As shown in FIG. 16, a large number of terminal insertion holes 45 are formed in the female connector housing 44.
Some of them become vacant holes, and the blocking plug 41 is inserted into these vacant holes. As a result, the sealing material 4 having elasticity
3 is pressed against the inner surface of the terminal insertion hole 45, the empty terminal insertion hole 45 is closed, and the female connector housing 44
A cavity defined by a male housing (not shown) is sealed to prevent water droplets from entering.

[0006]

However, in the cavity of the connector housing in which the open hole 45 is sealed by the blocking plug 41, the internal pressure rises or drops to a negative pressure each time the male and female housings are attached or detached. To do. At that time, the obstruction plug 41, which should have been sealed in the open hole 45, moves inside the hole and falls off from the hole to the inside of the cavity when a particularly large negative pressure is applied, making it impossible to maintain the sealed state of the cavity itself. I will let you.

Further, the maximum outer diameter of the obstruction plug 41 is naturally set to exceed the inner diameter of the terminal insertion hole 45, and when the obstruction plug 41 is pushed into the terminal insertion hole 45,
As shown in FIG. 17, the corrugated heads at both ends of the sealing material 43, which are relatively thin, are crushed and deformed by hitting the inner peripheral surface of the terminal insertion hole 45, and further pushed up to be rolled up and eventually damaged, so that the inner surface of the hole is There is a risk that the frictional force with the outer peripheral surface of the block plug may be reduced or air may leak, and the original function may not be exhibited.

[0008] Therefore, the conventional plug has a high sealing force or seating property itself because frictional force with the inner peripheral surface of the insertion hole is generated at both ends along the longitudinal direction, but the core member 4
Since 2 is hard and both ends are largely bulged, a large force is required for pushing and there is a risk of damaging the peripheral end portion of the sealing material.

An object of the present invention is to provide a waterproof connector having a simple structure which is easy to insert and has no damage to the peripheral edge portion even though it has a sealing force comparable to or higher than that of a conventional closure plug. To provide an obstruction plug. further,
It is an object of the present invention to provide a waterproof connector closing plug that exhibits a stable seating property even when pressure changes in both positive and negative directions occur when the connector is attached and detached, and has great versatility.

[0010]

The above-described object of the present invention is to provide the obstruction plug, which has a cylindrical main body made of an elastic material, and an elastic portion integrally formed on an outer peripheral surface of the main body.
This is achieved by providing a closure plug for a waterproof connector, characterized in that it comprises an elastic auxiliary member arranged in the main body along the longitudinal axis thereof.

According to the construction of the waterproof plug for the waterproof connector, since the elastic portion is integrally formed on the outer peripheral surface of the main body, the elastic portion having relatively large elasticity with respect to the end surface of the terminal insertion hole at the time of insertion is formed. The end faces only come into contact and are crushed and deformed, the direct contact of the main body with the end face of the terminal insertion hole is avoided, and the peripheral edge portion thereof is escaped from damage. Further, the rigidity of the axial direction is secured by the arrangement of the elastic auxiliary members arranged along the longitudinal axis of the main body, and the flexure with respect to the external pressure applied in the axial direction at the time of insertion is suppressed, so that a slight force can be applied. Easy to insert.

According to one embodiment of the waterproof connector obstruction plug of the present invention, the diameter of the main body is set to be smaller than the diameter of the terminal insertion hole, and the elastic auxiliary member is provided in the terminal insertion hole. At the inserting position, the repulsive force is generated against the pressing force inward of the main body in the radial direction due to the elastic deformation of the elastic portion.

With this construction, the end face of the main body is certainly protected from damage during insertion as described above, but the elastic auxiliary member is arranged in the main body so as to generate a repulsive force against elastic deformation. As a result, the repulsive force acts radially outward on the inner surface of the insertion hole via the elastic portion, making it difficult to move in the axial direction inside the terminal insertion hole. As a result, stable seating performance is exhibited against pressure changes in both positive and negative directions that occur when the connector is attached and detached.
The improvement of the seating property actually has the effect of preventing the obstruction plug from penetrating through the terminal insertion hole or falling into the cavity due to the pressure rise and the negative pressure in the cavity of the connector housing that occurs when the connector is attached and detached. .

According to another embodiment of the present invention, one end of the elastic auxiliary member is exposed from the end surface of the main body. With such a configuration, the end surface of the plug is to be reinforced and the axial pressure resistance, that is, the rigidity is strengthened, so that press-fitting the plug into the terminal insertion hole only applies a slight force to the exposed end. Is completed, and the direction of press fitting is also improved.

According to another embodiment, both ends of the elastic auxiliary member are exposed from the end surface of the main body. With such a configuration, the axial pressure resistance can be further enhanced as in the case described above, and the press-fitting directionality can be improved and press-fitting into the terminal insertion hole in both directions is possible.

According to yet another embodiment, the elastic auxiliary member includes a protruding portion that bulges outward at an axial position where the maximum elastic force of the elastic portion is generated.

What is important in such a structure is that the elastic portion is compressed in the empty terminal insertion hole by the elastic auxiliary member more strongly than the other portions at the axial position where the maximum elastic force of the elastic portion is generated. The frictional locking force is substantially maximized at one location of the obstruction plug, and combined with the frictional locking force at the other part of the elastic portion, the lateral movement is surely restricted. As a result, it is possible to further improve the seatability against the pressure change that occurs when the connector is attached and detached.

Further, according to another invention related to the present invention for achieving the above object, in a waterproof connector closing plug, which is hermetically fitted in a terminal insertion hole formed in a waterproof connector, said closing. An obstruction plug, characterized in that the plug is composed of a columnar main body having elasticity and having a recess formed along the longitudinal axis, and a pushing member that is inserted into and integrated with the recess. Provided.

In such a structure, the same operation and effect as in the case of the above-described structure of the present invention can be obtained. In addition to these, the block plug has the cylindrical main body, which is one of the components, inserted first. The two parts are fitted into the hole, and then the other part of the push-in member is inserted into the recessed part formed in the main body to be united with each other, whereby the terminal fitting hole is hermetically fitted. Since it is characterized by combining completely independent parts, it provides great versatility that the size, shape and material thereof can be freely selected according to the purpose of use and the situation.

According to one embodiment of the present invention, the recess has an insertion hole that opens at one end of the main body,
And an accommodating portion having an enlarged diameter forming an inner end portion of the insertion hole, wherein the pushing member is formed of a rod body having a bulged tip portion at one end, and the diameter of the tip portion is the It is set larger than the diameter of the storage part. Since the diameter of the tip portion of the pushing member is made smaller than the diameter of the housing portion, the main body is elastically compressed with respect to the terminal insertion hole in the radial direction.
The seating property in the axial direction at that portion is particularly improved, and high stability against a pressure change generated when the connector is attached / detached can be obtained.

Further, according to another embodiment,
The concave portion is provided with a hollow temporary holding portion for temporarily storing the tip end portion between the one end portion and the storage portion. In such a configuration, the tip portion is inserted into the housing portion at a stretch, in addition to the advantage that the tip portion can be temporarily assembled in the temporary holding portion before being inserted into the terminal insertion hole. Since it is possible to avoid applying an excessive axial pressure to move the seat, it is possible to avoid the risk of moving the seating position in the planned terminal insertion hole.

According to another embodiment, the tip of the pushing member has a conical shape. As a result, it is possible to obtain an effect that the insertion of the tip portion into the concave portion, particularly, the storage portion becomes smooth and easy.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a waterproof connector closure plug to which the present invention is applied will be described below with reference to FIGS. 1 is a perspective view showing the external shape of the plug, FIG. 2 is a cross-sectional view showing the internal structure of the plug, FIG. 3 is a perspective view showing the external shape of the elastic member, and FIGS. 4 to 6 are waterproof connectors for the plug. It is explanatory drawing shown in sectional drawing which divided the process of mounting | wearing with into 3 steps.

The obstruction plug 1 is integrally formed with an elastic portion 3 consisting of a plurality of continuously arranged annular ridges having an arcuate cross section on the outer peripheral surface of a cylindrical main body 2. In all the embodiments, the elastic portion 3 is exemplified by an annular ridge having a triple semicircular cross section for convenience of description. Furthermore, the plug 1 has a structure in which an elastic auxiliary member 4 is integrally embedded therein. Then, on each of the end faces 2a, 2b of the main body 2, the arc-shaped end of the elastic auxiliary member 4 is reinforced in order to reinforce the portion and improve the axial pressure resistance to accurately direct the press fit into the empty terminal insertion hole. The parts 4a and 4b are slightly exposed.

The main body 2 is made of an elastic material, and the elastic auxiliary member 4 is made of a relatively hard flexible synthetic resin or a metal strip material formed into an oval shape, as is apparent from FIG.
The upper and lower arc-shaped portions 5a and 5b sandwiched by the left and right arc-shaped end portions 4a and 4b can be flexibly deformed in a direction in which they approach each other. Small projections 6a and 6b, which bulge upwards and downwards in a mountain shape, are vertically symmetrically formed at approximately the center of the upper and lower arcuate portions 5a.

Although the main body 2 and the elastic auxiliary member 4 are separate members, they are integrated by insert molding to provide a single closure plug 1. Then, inside the closure plug 1, as shown in FIG. 2, the protrusions 6a and 6b of the elastic auxiliary member 4 are aligned and positioned at a position corresponding to the central portion of the elastic portion 3. With such an arrangement, when a uniform pressure is applied to the outer peripheral surface of the elastic portion 3 toward the central axis, the arcuate portions 5a and 5b of the elastic auxiliary member 4 are flexed and deformed in the proximity direction, and at the same time, A repulsive force is generated against the bending stress, and this repulsive force acts most strongly on the central portion of the elastic portion 3.

Next, the operation of inserting the plug 1 into the waterproof connector will be described in three stages with reference to FIGS. When the plug 1 is inserted, one end of the plug 1 is inserted into an empty terminal insertion hole 12 formed in the waterproof connector 11 as shown in FIG. The diameter of the main body 2 excluding the elastic portion 3 is set smaller than the inner diameter of the terminal insertion hole 12, but the diameter of the elastic portion 3 is set large. In addition,
In this embodiment, the elastic portion 3 is shown as an example in which three ridges having a semicircular cross section are connected in the axial direction.
It goes without saying that it can actually be increased or decreased depending on the length of the open hole or the magnitude of the negative pressure generated in the cavity.

Therefore, when one end of the plug 1 is inserted into the terminal insertion hole 12, the first elastic portion 3a in the pushing direction is pressed against the inner wall of the terminal insertion hole 12 to be crushed and deformed, as shown in FIG. When pushed in, the central elastic portion 3b is crushed and deformed as shown in FIG. Then, the plug 1 is attached to the terminal insertion hole 1
In the state of FIG.
All of a, 3b, and 3c are crushed and deformed, and the obstruction plug 1 is substantially fixed in the insertion hole in a state in which it cannot move in the axial direction, and exhibits a seating property that can sufficiently cope with the pressure environment generated in the cavity. .

When the plug 1 is inserted in this way, the main body 2 forming the plug 1 has elasticity, and the elastic portions 3a, 3b, 3c having a semicircular cross section are formed on the outer periphery thereof. Therefore, the crushing deformation is easily and elastically performed. When the elastic portion 3 is crushed and deformed, the elastic auxiliary member 4
Also a small projection 6 provided in the central portion from the arcuate end 4a on the front side.
It is flexibly deformed so as to be crushed in order toward a and 6b.

As a result, the largest repulsive force is locally generated at the central elastic portion 3b aligned with the small protrusions 6a and 6b having the largest deformation amount in the elastic auxiliary member 4, so that the left and right inside the insertion hole are formed. The frictional locking force in the axial direction is uniformized, and both positive and negative pressures generated in the cavity can be resisted to the same degree, and a stable fixed state can be obtained regardless of attachment / detachment of the connector housing.

Further, according to the constitution of the obstruction plug 1 in the present embodiment, the end face of the main body 2 forming the end portion of the obstruction plug 1 does not hit the open end portion of the terminal insertion hole 12 and is not damaged. It is the first elastic portion 3a having the largest amount of elastic deformation that first comes into contact with the opening end, and the insertion and insertion work can be performed smoothly in the correct direction and without applying excessive force. There is no fear of damaging the.

Next, referring to FIGS. 7 to 9, the second embodiment of the present invention will be described.
An embodiment will be described. 7 is a perspective view showing the overall shape of the plug, FIG. 8 is a sectional view showing the internal structure of the plug, and FIG. 9 is a perspective view showing the overall shape of the elastic auxiliary member.

The difference between this embodiment and the first embodiment is that the elastic auxiliary member has a different structure. First, referring to FIG. 7, the obstruction plug 1 according to the present embodiment.
The external shape of the main body 2 is the same as that of the first embodiment, but a plate-shaped body 15a, which is a base of the elastic auxiliary member 15 and preferably has a disk shape, is formed so as to cover one end surface 2a of the main body. Exposed.

As shown in FIGS. 8 and 9, the elastic auxiliary member 15 integrally includes a plate-shaped body 15a and two elastic leg portions 16a, 16b extending vertically or pre-opened from one surface thereof. The free ends thereof are provided with protrusions 17a and 17b that face each other outward. The lengths of the elastic legs 16a and 16b are set so that the protrusions 17a and 17b correspond to the central elastic portion 3b when the elastic auxiliary member 15 is embedded in the main body 2.

The main body 2 may be made of the same material as described above, and with respect to the elastic auxiliary member 15, after the elastic leg portions 16a and 16b are flexed and deformed inward when the closing plug 1 is inserted into the terminal insertion hole, the elastic auxiliary member 15 is deformed. Any material may be used as long as it is flexible enough to repel outward, but in actual production, it is preferably an integrally molded product made of a plastic synthetic resin.

When the plug 1 is fitted into the terminal insertion hole as described above, it is fitted from the end face where the plate member 15a is exposed. At this time, the elastic portion 3 is sequentially crushed and deformed from the elastic portions 3a to 3c at the left end portion similarly to the above-described embodiment, and the elastic leg portions 16a and 16b are flexibly deformed inwardly accordingly. Therefore, the plug 1 is smoothly inserted into the terminal insertion hole, and the repulsive action of the protrusions 17a and 17b exerts the largest friction locking force at the central elastic body 3b, so that the connector housing can be attached and detached. A stable seated state can be obtained irrespective of the pressure change due to, and the elastic portion 3 can be fitted without exerting an unreasonable force in the fitting and inserting work as in the above-described embodiment.
There is no fear of damaging a.

Next, a third embodiment of the present invention will be described with reference to FIGS. 10 is a cross-sectional view showing the internal structure of the block plug, and FIG. 11 is a perspective view showing the elastic auxiliary member.

The difference between this embodiment and the first embodiment is that the structure of the elastic auxiliary member is changed. First, the structure of the elastic auxiliary member 21 according to the present embodiment will be described. As shown in FIG. 11, two side plates 21 a and 21 b, which are preferably arranged in parallel with each other and have a disc shape, are provided in the main body 2 of the plug 1. In addition to providing two parallel rod-shaped bodies 22a and 22b having parallel connection with each other,
Protrusions 23a and 23b that bulge outward are provided at substantially central portions of the rod-shaped bodies 22a and 22b.

The external shape and material of the main body 2 are the same as those shown in the above-mentioned embodiments, and the material of the elastic auxiliary member 21 may be the same as those shown in the above-mentioned embodiments. The main body 2 and the elastic auxiliary member 21 are integrated by injection molding or the like, the side plates 21a and 21b are exposed from both end surfaces of the main body 2, and the protrusions 23a and 23b are central portions of the elastic portion 3 as shown in FIG. Positioned to match 3b.

When the blocking plug 1 is fitted into the terminal insertion hole, it may be pushed in from any end. When the plug 1 is pushed into the terminal insertion hole in the same manner as described above, the elastic portion 3 is sequentially crushed and deformed from the elastic portion 3a at the end according to the degree of pushing, and at the same time, the rod-shaped bodies 22a and 22b are elastic portions 3b at the center. In response to the inward movement of the projections 23a and 23b due to the deformation of the above, the elastic deformation is performed inward. Therefore, the plug 1
In a state in which is inserted into the terminal insertion hole, the elasticity of the elastic portion 3 and the repulsive force of the rod-shaped bodies 22a and 22b cause the elastic portion 3 to expand diametrically outward, and the outer peripheral surface of the terminal insertion hole is expanded. The inner surface is strongly pressed to generate a large frictional locking force between the two, and the obstruction plug 1 can obtain a stable fixed state in the insertion hole regardless of the pressure change due to the attachment / detachment of the connector housing, and the above-described embodiment. Similarly to the above, there is no fear that the elastic portion 3a will be damaged without exerting an unreasonable force in the fitting operation.

By the way, in the present embodiment, the following remarkable actions are performed by the structure of the elastic auxiliary member 21. That is, the rod-shaped bodies 22a and 22b are flexibly deformed, but have no elasticity. Therefore, when the plug 1 is inserted into the terminal insertion hole and the rod-shaped bodies 22a and 22b are bent and deformed inward, the side plates 21a and 21b on both sides move in a direction in which they approach each other. Since the side plates 21a and 21b cover both end surfaces of the main body 2, when the side plates 21a and 21b move in the proximity direction, the entire main body 2 comes to be axially compressed from both sides, and in response to this force. The elastic portion 3 tries to expand outward as a whole.

As a result, the elastic portion 3 is further pressed against the inner peripheral surface of the terminal insertion hole, and the closing plug 1 generates a larger frictional locking force around the central elastic portion 3b in the terminal insertion hole. As a result, an extremely large fixing force is exerted.

Next, referring to FIG. 12 to FIG.
The second invention, which is slightly different in structure from the first invention, will be described in detail below with respect to one embodiment.

FIG. 12 is a perspective view showing the shapes of the main body and the pushing member, FIG. 13 is a sectional view showing the initial insertion state of the pushing member into the terminal insertion hole, and FIG. 14 is the final insertion state of the terminal insertion hole. FIG.

The difference between the embodiment according to the present invention and the first embodiment described above is that the internal structure of the main body 2 is changed, and the pushing member 31 is replaced with an elastic auxiliary member and the pushing member 31 is moved in the longitudinal central axis L of the main body 2. There is a point that the main body 2 is entirely expanded to the outside by being press-fitted into the insertion hole 7 that forms a recessed hole formed along.

The push-in member 31 has a rod body 32 standing vertically from one surface of the substrate 31a, which is preferably in the shape of a disk.
A tip portion 33 that bulges in a conical shape is provided at one end thereof. On the other hand, an insertion hole 7 for inserting the distal end portion 33 is formed in the end surface 2b of the main body 2 along the central axis L in the longitudinal direction, and an annular hollow temporary holding portion is formed so as to communicate with the insertion hole 7. 8 and a rear portion thereof, a conical storage portion 9 is provided via an annular wall 10 that defines a radial partition wall on the inner depth side of the temporary holding portion. It should be noted that the temporary holding portion 8 has a tip portion 33.
The tip portion 33 is temporarily accommodated when the is pressed into the main body 2, and its maximum diameter is set larger than the maximum diameter of the tip portion.

The storage portion 9 is a space similar in shape to the tip portion 33, but its maximum diameter is set smaller than the maximum diameter of the tip portion. In addition, once the tip portion 3 is press-fitted into the storage portion 9,
3 has a storage part 9 defined from the rear side so that the annular wall 10 extending inward in the radial direction is located at the rear side so that the storage wall 9 is not easily pulled out in the opposite direction. It is to be noted that the tip portion 33 exerts the same action as the protrusion portions 6a and 6b connected to the upper and lower arc-shaped portions 5a and 5b of the elastic auxiliary member 4 in the first embodiment described above, as will be described below. it is obvious.

When the plug 1 is inserted into the terminal insertion hole, the tip portion 33 of the pushing member 31 is inserted from the insertion hole 7 as shown in FIG. 12, and the hollow temporary holding portion 8 as shown in FIG. It is temporarily housed inside. Next, the one end face 2a of the main body 2 is pushed into the terminal insertion hole similarly to the above-described embodiment. However, there is an end face 2a which inhibits the crush deformation of the main body 2 and the elastic portion 3a of the leading end portion. Since it is not present, the pushing is extremely smooth by applying a small external force in the axial direction.

At the stage of pushing the entire main body 2 into the terminal insertion hole, some frictional force is generated between the elastic portion 3 of the main body 2 and the inner side surface of the terminal insertion hole, so that a fixed state can be obtained to some extent. It is only moved by the pressure change in the housing cavity. Therefore, in order to maintain a stable fixed state against a large pressure change, at this stage, when an external force in the axial direction is applied to the substrate 31a and the entire pushing member 31 is pushed toward the inside of the main body 2, the main body 2 is Since it does not move easily due to the frictional force, only the pushing member 31 is pushed inward in the main body. As a result, as shown in FIG. 14, the tip portion 33 moves from the temporary holding portion 8 through the elastic annular wall 10 into the storage portion 9.

Since the maximum diameter of the storage portion 9 is set to be slightly smaller than the maximum diameter of the tip portion 33 as described above, when the tip portion 33 is pushed into the storage portion 9, the main body 2 and the elastic portion are pushed. 3 tries to expand radially outward from the position indicated by the imaginary line in FIG. 14 to the position indicated by the solid line. However, at this stage, since the main body 2 has already been pushed into the terminal insertion hole, it does not actually expand to the state shown by this solid line, and the inner peripheral surface of the terminal insertion hole is expanded by the amount of expansion. Is converted into a repulsive force that presses the elastic portion 3, and particularly the crush deformation of the entire elastic portion centering on the central elastic portion 3b occurs.

Therefore, the pushing-in is carried out extremely smoothly only by applying a slight external force, and the pushing-in member 31 is press-fitted into the insertion hole 7 and the tip end 33 is fitted into the accommodating portion 9, so that the elastic portion 3 of the main body 3 is pushed. The expansion of the radial direction outwards causes an extremely strong fixed state with the terminal insertion hole due to mechanical conversion into crush deformation due to its elasticity, and it is possible to cope with extremely large pressure fluctuations inside the cavity. It is understood that

[0052]

Since the obstruction plug according to the first aspect of the present invention has the above-mentioned structure, when the obstruction plug is inserted into the terminal insertion hole, the elasticity at both ends of the main body and the elastic auxiliary member is of the conventional type. Although it is larger than the above, and can be easily crushed and deformed, the rigidity of the elastic auxiliary member in the axial direction, which is the insertion direction, is secured by the arrangement of the elastic auxiliary member along the axial direction. Therefore, it is possible to prevent the accident such as the damage due to the opening end portion caused by the press fit into the terminal insertion hole of the main body, which is apt to occur in the prior art.

In addition to the effect of the first aspect of the invention described above, the second aspect of the invention has a structure in which a separate member is inserted as an elastic auxiliary member into the elastic body, so that the body moves radially outward. It expands due to a large radial diffusion force, and the repulsive force causes the main body to be frictionally locked to the inner peripheral surface of the terminal insertion hole with an extremely large force through the elastic part. Stable seating is obtained against pressure changes in the positive and negative directions in the cavity due to
Therefore, it is possible to obtain the effect that the waterproof property is greatly improved. Further, as a side effect of the two-part configuration, it is said that while manufacturing the main body corresponding to various diameters of the terminal insertion holes into which the main body is inserted, the pressing member having a certain size is applied as it is. It can be used in various combinations and has great versatility.

[Brief description of drawings]

FIG. 1 is a first block plug for a waterproof connector to which the present invention is applied.
It is a perspective view showing an embodiment.

FIG. 2 is a cross-sectional view showing an internal configuration of a blocking plug.

FIG. 3 is a perspective view showing a configuration of an elastic auxiliary member.

FIG. 4 is a perspective view showing fitting of a blocking plug.

FIG. 5 is a cross-sectional view showing a crushing deformation of an elastic portion at the time of fitting and insertion.

FIG. 6 is a cross-sectional view showing flexural deformation of the elastic auxiliary member after the insertion.

FIG. 7 is a perspective view of an obstruction plug showing a second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing the internal structure of the blocking plug.

FIG. 9 is a perspective view showing the shape of an elastic auxiliary member.

FIG. 10 is a sectional view of an obstruction plug showing a third embodiment of the present invention.

FIG. 11 is a perspective view showing the shape of an elastic auxiliary member.

FIG. 12 is a perspective view of an obstruction plug showing a fourth embodiment of the present invention.

FIG. 13 is a cross-sectional view of the blocking plug showing a fitted state.

FIG. 14 is a cross-sectional view of the closure plug showing a press-fitted state of the tip portion.

FIG. 15 is a sectional view showing an example of a conventional closure plug for a waterproof connector.

FIG. 16 is a perspective view showing how a blocking plug is inserted into a terminal insertion hole.

FIG. 17 is a cross-sectional view showing a crushing deformation of the sealing material when the blocking plug is inserted and inserted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof plug 2 Plug 3 Main body 3 Elastic part 4, 15, 21 Elastic auxiliary member 5a, 5b Arc-shaped part 6a, 6b Small protrusion 7 Insertion hole 8 Temporary holding part 9 Storage part 10 Annular wall 11 Waterproof connector 12 Terminal insertion hole 15a plate-like body 16a, 16b elastic leg 17a, 17b protrusion 21a, 21b side plate 22a, 22b rod-like body 23a, 23b protrusion 31 push-in member 31a substrate 32 rod body 33 tip portion

Claims (9)

[Claims] 1. A closure plug for a waterproof connector, which is hermetically fitted in a terminal insertion hole formed in a waterproof connector, wherein the closure plug is a cylindrical main body made of an elastic material, and is integrally formed on an outer peripheral surface of the main body. And an elastic auxiliary member disposed along the longitudinal axis of the main body. 2. The diameter of the main body is set to be smaller than the diameter of the terminal insertion hole, and the elastic auxiliary member is elastically deformed by the elastic portion at a fitting position in the terminal insertion hole. The closure plug for a waterproof connector according to claim 1, wherein a repulsive force is generated with respect to a pressing force inward of the main body in the radial direction. 3. The closure plug for a waterproof connector according to claim 1, wherein one end of the elastic auxiliary member is exposed from an end surface of the main body. 4. The closing plug for a waterproof connector according to claim 1, wherein both ends of the elastic auxiliary member are exposed from an end surface of the main body. 5. The elastic auxiliary member is provided with a protrusion that bulges outward at an axial position where the maximum elastic force of the elastic portion is generated. The closure plug for a waterproof connector according to any one of claims. 6. A closure plug for a waterproof connector, which is hermetically fitted in a terminal insertion hole formed in a waterproof connector, wherein the closure plug has a recess formed along the longitudinal axis and is elastic. An obstruction plug comprising: a cylindrical main body having; and a pressing member that is inserted into and integrated with the recess. 7. The recess has an insertion hole that opens at one end of the main body, and a storage portion having an enlarged diameter that forms an inner end of the insertion hole, and the pressing member has one end. 7. The closure plug for a waterproof connector according to claim 6, which is composed of a rod body having a bulged tip portion, and the diameter of the tip portion is larger than the diameter of the housing portion. 8. The hollow portion is provided with a hollow temporary holding portion for temporarily storing the tip portion between the one end portion and the storage portion. Or the closure plug for a waterproof connector as described in 7. 9. The closure plug for a waterproof connector according to claim 6, wherein the tip end portion of the pressing member has a conical shape.