JP3153758B2 - Waterproof plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof plug for sealing a gap between an outer periphery of an electric wire and an inner periphery of an insertion hole of a housing.

[0002]

2. Description of the Related Art As a conventional example of a waterproof plug, Japanese Utility Model Laid-Open No. 62-2 is known.
One disclosed in Japanese Patent Application No. 01480 is known. FIG. 4 shows a shape of the waterproof plug 1 in a free state, and FIG. 5 shows a state in which the waterproof plug 1 is inserted into an insertion hole 5 of a housing 3 such as a connector.

[0003] The waterproof plug 1 is made of rubber and comprises a thick waterproof plug body 7 and a thin-walled caulked portion 9, and has a cylindrical shape as a whole.

[0004] Annular projections 11 and 13 are formed on the outer periphery and inner periphery of the waterproof plug main body 7, respectively. The waterproof plug 1 is inserted through the waterproof plug main body 7 and the caulked portion 9 into the electric wire insertion hole 15.
Are formed.

As shown in FIG. 5, the waterproof plug 1 is provided with an electric wire insertion hole 1.
5 is inserted into the insertion hole 5 of the housing 3 with the electric wire 17 passed through. At this time, the annular protrusion 11 on the outer peripheral side of the waterproof plug main body 7 is crushed by the insertion hole 5, and the outer peripheral side is tightly fitted to the insertion hole 5 to seal the outer peripheral side. The inner peripheral side is sealed in close contact with the electric wire 17.

The crimping portion 9 is a portion for crimping the electric wire 17 and, as shown in FIG. 5, the wire crimping portion 1 of the terminal fitting.
9 and fixed to the electric wire 17 from the outer periphery.

The waterproof plug 1 is required to have a predetermined compression ratio P (for example, 30%) in order to satisfy the sealing property.

Here, when the waterproof plug 1 is inserted into the insertion hole 5, the compression rate P of the waterproof plug 1 is determined by the inner diameter c of the insertion hole 5, the electric wire 1
7, the thickness r of the entire waterproof plug in the free state, and the inner diameter of the waterproof plug body 7 in the free state.

[0009]

However, as described above, since the waterproof plug 1 relies only on the bending of the annular projection 13 for the adhesion (sealing property) to the electric wire, each of the electric wires having greatly different diameters is used. And it is difficult to obtain a desired compression ratio P.

For example, if a wire having a smaller outer diameter d is used for the waterproof plug 1 which can obtain a compression ratio P of 30% with a large-diameter wire, the compression ratio P decreases and a compression ratio P of 30% cannot be obtained. . Further, if the inner diameter w of the waterproof plug body 7 is reduced for a thin electric wire having an outer diameter d, the compression ratio P becomes too large for a large-diameter electric wire, which adversely affects the insertability of the electric wire.

As described above, since the conventional waterproof plug 1 has low adaptability to electric wires having different diameters, it is necessary to prepare various types of waterproof plugs in order to widely support various types of electric wires having different diameters. The number of parts increases and the cost increases, and the number of management steps also increases.

The present invention has been made in view of the above circumstances, and has as its object to provide a waterproof plug which can be widely applied to electric wires of different diameters, thereby reducing the number of types and greatly reducing costs and man-hours for management.

[0013]

According to a first aspect of the present invention, there is provided a cylindrical waterproofing having an outer peripheral portion having a seal portion in close contact with an insertion hole of a housing, and a central portion having an electric wire insertion hole through which an electric wire is inserted. A waterproof plug having a plug main body and a lip protruding from an inner wall of an electric wire insertion hole and closely contacting an outer periphery of the inserted electric wire, wherein the lip is formed to be tiltable by friction with the inserted electric wire. Along with, on one opening side of the electric wire insertion hole of the waterproof plug main body, a crimping portion for a thick electric wire is provided, and on the other opening side, a crimping portion for a thin electric wire smaller in diameter than the thick electric wire is provided, The thick wire is inserted from the crimped portion for the thick wire to the crimped portion side for the thin wire, and the thin wire is inserted from the crimped portion for the thin wire to the crimped portion for the thick wire. And a seal is performed between the inserted electric wire and the lip portion.

Thus, the waterproof plug according to the first aspect of the present invention enables the lip portion to be tilted by friction with the inserted electric wire, and inserts the thick electric wire from the caulking portion for the thick electric wire. The thin electric wire is inserted from the crimping portion for the thin electric wire, thereby pushing the lip portion from both directions and inclining it.

When the lip is tilted, a sufficient sealing property is obtained by a moderate interference with the thick electric wire, and when the lip is erected, the sealing is properly performed with the thin electric wire (outer diameter d2). Sufficient sealability can be obtained by the interference.

As described above, the lip portion is brought into close contact with the outer periphery of both the thick electric wire and the thin electric wire inserted with a sufficient interference,
Demonstrate high sealing performance.

Thus, the waterproof plug according to the first aspect can be applied to a wide range of electric wires from a large diameter to a small diameter with a desired compression ratio. The applicable outer diameter difference of the electric wire is extremely wide as compared with the conventional example which depends only on the bending of the annular projection 13.

Therefore, the waterproof plug according to the first aspect of the present invention can cope with many kinds of different-diameter electric wires having greatly different outer diameters by preparing a much smaller number of types than the conventional one. And greatly reduced.

According to a second aspect of the present invention, in the waterproof plug according to the first aspect, when the thick electric wire is inserted into the electric wire insertion hole, the lip portion is inclined toward the inner wall side of the electric wire insertion hole, and The lip portion rises from the inner wall of the electric wire insertion hole when the thin electric wire is inserted into the hole, and the same effect as the waterproof plug according to claim 1 is obtained.

In addition, the lip portion is inclined to the inner wall side of the wire insertion hole when a thick wire is inserted, and the lip portion rises from the inner wall of the wire insertion hole when a thin wire is inserted. The difference in the outer diameter of the electric wire between the time when the lip portion is tilted and the time when the lip portion stands can be further increased.

Therefore, the waterproof plug according to claim 2 can be applied to a wider range of electric wires of different diameters, and the effect of reducing the number of parts, the number of man-hours and the cost is great.

According to a third aspect of the present invention, there is provided the first or second aspect.
3. The waterproof plug according to claim 1, wherein an inner wall of the electric wire insertion hole is provided with a lip escape groove in which the inclined lip is stored. To get the effect.

In addition, since the lip portion at the time of tilting is stored in the lip escape groove, the outer diameter of the wire that can be inserted at the time of tilting is the largest, and the outer diameter difference of the wire is correspondingly large.

Therefore, the waterproof plug according to the third aspect is applicable to the widest range of different-diameter electric wires, and has a great effect of reducing the number of parts, the number of man-hours and the cost.

The invention of claim 4 is the first to third aspects of the present invention.
The waterproof plug according to any one of claims 1 to 3, wherein the number of the lip portions is increased as an electric wire to be inserted is thinner. The same effect can be obtained.

In addition to this, by increasing the number of the lip portions as the wire to be inserted is thinner, for example, when the number of the lip portions is small, the tightness and the sealing performance are insufficient. Since a sufficient interference and sealing property can be obtained for the electric wire, the outer diameter difference (d1-d2) of the insertable electric wire can be increased toward the thin electric wire.

Therefore, the waterproof plug according to the fourth aspect can be applied to a wide range of different-diameter electric wires, and has a great effect of reducing the number of parts, the number of man-hours and the cost.

The invention according to claim 5 is the invention according to claims 1 to 4.
The waterproof plug according to any one of the above, wherein a plurality of the lip portions are provided, and according to an outer diameter of an electric wire to be inserted,
A different inner diameter is given to the tip of each lip portion, and the same effect as the waterproof plug according to any one of claims 1 to 4 is obtained.

In addition, by giving different inner diameters to the tips of the lip portions at the time of standing, the range of the wire diameter at which a desired interference can be obtained is widened on the thin wire side, and the number of parts and the number of parts are reduced accordingly. The management man-hour and cost reduction effect are improved.

When a thick electric wire is inserted, each lip is inclined, so that even if a lip having a small inner diameter is formed, the workability is not reduced.

The invention of claim 6 is the invention of claims 1 to 5
The at least one of the thick wire crimping portion and the thin wire crimping portion is crimped and connected by the wire crimping portion of the terminal fitting. The same effect as the waterproof plug according to any one of claims 1 to 5 is obtained.

In addition, since the crimping portion is crimped by the wire crimping portion of the terminal fitting, and the wire and the waterproof plug are firmly fixed, no external force is applied to the wire, thereby preventing a disconnection accident. .

[0033] The invention of claim 7 is the first to sixth aspects of the present invention.
The waterproof plug according to any one of the preceding claims, wherein each inner peripheral cross section of the electric wire insertion hole and the lip portion is formed so as to conform to the outer peripheral shape of the electric wire so as to be in close contact with the outer periphery of the electric wire to be inserted. The same effect as the waterproof plug according to any one of claims 1 to 6 is obtained.

In addition to this, the inner peripheral cross section of each of the electric wire insertion hole and the lip portion is formed in conformity with the outer peripheral shape so as to be in close contact with the outer periphery of the electric wire to be inserted.
The effect of the present invention can be obtained even with a wire having an elliptical cross section.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. This embodiment corresponds to claims 1, 2,
It has 3, 6, and 7 features. In the following description, the left and right directions are the left and right directions in FIGS.

FIG. 1A is a longitudinal sectional view of a waterproof plug 31 according to an embodiment of the present invention, FIG. 1B is a longitudinal sectional view of the waterproof plug 31 into which a thick electric wire 33 is inserted, and FIG. 2 is a vertical sectional view of a waterproof plug 31 into which a thin electric wire 35 is inserted, FIG. 2 is a vertical sectional view of an insertion hole 39 of a housing 37 such as a connector, and FIG.
FIG. 4 is a perspective view of a terminal fitting 41.

As shown in FIG. 1 (a), the waterproof plug 31 includes a cylindrical waterproof plug main body 43, a crimping portion 45 for a thick electric wire provided on the left side thereof, and a thin object provided on the right side thereof. And a crimping portion 47 for an electric wire. Through these caulking portions 45, the waterproof plug main body 43, and the caulking portions 47, the electric wire insertion holes 49 are provided.
Are formed. The waterproof plug 31 is integrally formed of rubber.

In the waterproof plug main body 43, two annular projections 51 (sealing portions) are formed on the outer periphery, and two annular lip portions 53 are formed on the inner periphery. Each lip portion 53 can be tilted rightward as shown in FIGS. 1B and 1C by the elasticity of rubber. On the inner wall of the waterproof plug main body 43, a lip escape groove 55 for accommodating the lip portion 53 when tilted is provided on the right side of each lip portion 53.

Since the outer periphery of the thick electric wire 33 and the thin electric wire 35 is circular, the electric wire insertion hole 49 and the lip 53
Each inner peripheral shape is also circular according to these.

The inner diameter of the crimping portion 45 for a thick wire is
The diameter is larger than the inner diameter of the crimping portion 47 for a thin wire.

Next, the operation will be described.

The thick wire 33 is inserted into the wire insertion hole 49 of the waterproof plug 31 from the thick wire crimping portion 45 to the thin wire crimping portion 47 as shown by an arrow A in FIG. It is inserted. By inserting the thick electric wire 33, each lip 53 is tilted rightward as shown in FIG.
Fit in.

At this time, the abdominal portion 57 of each lip portion 53 is in close contact with the outer periphery of the thick electric wire 33, and shows a large sealing property by a sufficient interference.

As shown by the arrow B in FIG. 1A, the thin wire 35 is inserted into the wire insertion hole 49 of the waterproof plug 31 from the crimped portion 47 for thin wire toward the crimped portion 45 for thick wire. It is inserted. Each lip portion 53 rises from the inner wall of the electric wire insertion hole 49 as shown in FIG.

At this time, the tip portion 59 of each lip portion 53 is in close contact with the outer periphery of the thin electric wire 35, and exhibits a large sealing property with a sufficient interference.

As shown in FIG. 3, the terminal fitting 41 is crimped at the wire crimping portion 61, for example, from the outer periphery of the crimping portion 47 for a thin wire, and the wire crimping portion 63 is crimped at the thin wire 35 from the outer periphery. By tightening, the electric wire 35 and the caulked portion 47 are fixed, the electric wire 35 is protected from external force, and a disconnection accident is prevented.

The waterproof plug 31 is attached to the insertion hole 39 of the housing 37 shown in FIG. 2 with the inserted thick electric wire 33 or thin electric wire 35 fixed by the terminal fitting 41 in this manner.

At this time, each of the annular projections 51 on the outer periphery of the waterproof plug main body 43 is crushed and comes into close contact with the wall of the insertion hole 39 to seal this portion.

In FIGS. 1 to 3, when the compression rate of the waterproof plug main body 43 when the waterproof plug 31 is inserted into the insertion hole 39 is P, the inner diameter of the insertion hole 39 (the annular projection when inserted into the insertion hole 39). 51, the outer diameter of the thick electric wire 33 (the abdomen 57 when the electric wire 33 is inserted and each lip 53 is tilted)
Inner diameter) d1, the outer diameter of the thin electric wire 35 (the inner diameter of the distal end 59 when the electric wire 33 is inserted and each lip 53 rises) d
2. The thick wall r1 of the waterproof plug main body 43 when the thick electric wire 33 is inserted and inserted into the insertion hole 39, and the waterproof plug main body 43 when the thin electric wire 35 is inserted and inserted into the insertion hole 39. Thickness r2, outer diameter of waterproof plug body 43 in free state (annular protrusion 5
1 outer diameter) D.

As described above, the waterproof plug 31 is connected to the thick electric wire 3.
3, the lip portion 53 is tilted, and the thin wire 35
The lip portion 53 is erected by the insertion of the thick wire 33
Sufficient sealing properties can be obtained for both the wire and the thin wire 35.

Therefore, each dimension d1, r1 is set
3 is set so that a desired compression ratio (for example, 30%) is obtained, and the respective dimensions d2 and r2 are obtained so that a desired compression ratio (for example, 30%) is obtained for the thin electric wire 35. Can be set as follows.

In this way, the waterproof plug 31 can be applied to a wide range of electric wires from a large diameter to a small diameter. The applicable outer diameter difference (d1-d2) of the electric wire is much wider than the conventional example which relies only on the bending of the annular projection 13.

Therefore, if a small number of waterproof plugs having the same structure as the waterproof plug 31 are prepared, it is possible to widely cope with various types of wires having different outer diameters. Can be greatly reduced.

In addition to this, the outer diameter (d1) of the thick electric wire which can be inserted at the time of tilting is further increased by providing the lip escape groove 55 for accommodating the lip portion 53 at the time of tilting. The applicable range of the electric wire (the difference in the outer diameter d1-d2 of the insertable electric wire) is widened, and the effect of reducing the number of parts, the number of man-hours and cost is further increased.

In the present invention, rubber is suitable for the material of the waterproof plug, but other materials may be used as long as they have sufficient electrical insulation and moderate elasticity.

[0056]

As described above, according to the first aspect of the present invention, by providing the tiltable lip portion,
A waterproof plug applicable to a wide range of electric wires from a large diameter to a small diameter is obtained. Accordingly, if a small kind of waterproof plug of this kind is prepared, it is possible to widely cope with various kinds of electric wires having greatly different outer diameters, so that the number of parts of the waterproof plug is reduced, and the number of man-hours and cost for management are greatly reduced. be able to.

According to the second aspect of the present invention, the lip is inclined when a thick electric wire is inserted, and the lip is raised when a thin electric wire is inserted. It can be applied to wire with large diameter, and the effect of reducing the number of parts, the number of man-hours and the cost is great.

According to the third aspect of the present invention, the outer diameter of the electric wire which can be inserted at the time of tilting is increased by storing the lip at the time of tilting by the lip escape groove, so that a wide range of different diameters can be obtained. It can be applied to wire with large diameter, and the effect of reducing the number of parts, the number of man-hours and the cost is great.

According to the fourth aspect of the present invention, by increasing the number of lip portions as the wire to be inserted is thinner, sufficient tightening margin and sealability can be obtained even for a thin wire.
The outer diameter difference (d1-d2) of the insertable electric wire can be widened toward the thin electric wire side, so that it can be applied to a wide range of different diameter electric wires, and the number of parts, the number of man-hours, and the cost reduction effect are great.

According to the fifth aspect of the present invention, by giving different inner diameters to the tips of the lip portions, the range of the wire diameter at which a desired interference can be obtained can be widened toward the thin wire. The workability at the time of inserting a thick wire is not reduced while improving the number of parts, the number of man-hours, and the cost.

According to the sixth aspect of the present invention, since the electric wire crimping portion is crimped by the terminal fitting and the electric wire and the waterproof plug are firmly fixed, no external force is applied to the electric wire, and a disconnection accident is prevented. .

According to the seventh aspect of the present invention, the inner peripheral cross section of each of the electric wire insertion hole and the lip portion is formed so as to be in close contact with the outer periphery of the electric wire to be inserted. However, the present invention can also be applied to extend the applicable range of the present invention and enjoy the effects described above.

[Brief description of the drawings]

FIG. 1 shows a waterproof plug according to an embodiment of the present invention, in which (a) is a longitudinal sectional view, (b) is a longitudinal sectional view showing a state in which a thick wire is inserted through the waterproof plug, and (c) is a waterproof plug. FIG. 5 is a longitudinal sectional view showing a state in which a thin object wire is inserted.

FIG. 2 is a longitudinal sectional view of an insertion hole of a housing.

FIG. 3 is a perspective view showing a waterproof plug and a terminal fitting of FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional example.

5 is a longitudinal sectional view showing a state where the conventional example of FIG. 4 in which an electric wire is inserted is inserted into an insertion hole of a housing.

[Explanation of symbols]

 Reference Signs List 31 waterproof plug 33 thick electric wire 35 thin electric wire 37 housing 39 insertion hole 41 terminal fitting 43 waterproof plug main body 45 crimping portion for thick electric wire 47 crimping portion for thin electric wire 49 electric wire insertion hole 51 annular projection 53) Lip part 55 Lip part escape groove 59 Tip part of lip part 61 Wire crimping part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-296884 (JP, A) JP-A-5-205812 (JP, A) JP-A 8-250202 (JP, A) JP-A-7-968 245149 (JP, A) JP-A-5-6784 (JP, A) Japanese Utility Model Application Sho 55-60682 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 13/50 301

Claims (7)

(57) [Claims] A cylindrical waterproof plug body having an outer peripheral portion having a seal portion in close contact with an insertion hole of a housing and a central portion having an electric wire insertion hole through which an electric wire is inserted; A waterproof plug having a lip portion closely attached to the outer periphery of the inserted electric wire, the lip portion being formed so as to be tiltable by friction with the inserted electric wire, and a water insertion hole of the waterproof plug main body. A crimping portion for a thick wire is provided on one opening side, and a crimping portion for a thin wire having a smaller diameter than the thick wire is provided on the other opening side, and the crimping portion for the thick wire is provided. The thin wire is inserted from the tightened portion to the crimped portion side for the thin wire, and the thin wire is inserted from the crimped portion for the thin wire to the crimped portion side for the thick wire, and the inserted wire and the lip are inserted. Between the department
The waterproof plug is characterized in that the waterproofing is performed. 2. The thin wire according to claim 1, wherein the lip portion is tilted toward the inner wall of the wire insertion hole when the thick wire is inserted into the wire insertion hole, and the thin wire is inserted into the wire insertion hole. Wherein the lip portion rises up from the inner wall of the electric wire insertion hole when the waterproof plug is inserted. 3. The waterproof plug according to claim 1, wherein a lip escape groove for accommodating the tilted lip portion is provided on an inner wall of the electric wire insertion hole. . 4. The waterproof plug according to any one of claims 1 to 3, wherein the number of the lip portions is increased as the electric wire to be inserted is thinner. 5. The invention according to claim 1, wherein a plurality of said lip portions are provided, and a plurality of said lip portions are provided at a tip of each lip portion according to an outer diameter of an electric wire to be inserted. A waterproof plug characterized by different inner diameters. 6. The invention according to claim 1, wherein at least one of the thick wire crimping portion and the thin wire crimping portion is a terminal fitting. A waterproof plug characterized by being crimped and connected at a wire crimping portion of the above. 7. The invention according to claim 1, wherein the inner peripheral cross sections of the electric wire insertion hole and the lip portion are brought into close contact with the outer periphery of the electric wire to be inserted. A waterproof plug characterized by being formed according to the outer shape.