JP7065537B2 - Vehicle power socket - Google Patents

Description

The present invention relates to a power socket for a vehicle.

Conventionally, when a vehicle such as a car or a large scooter is provided with an electric device for a vehicle such as a portable navigation device, a drive recorder device, or a radar detector, the plug of the electric device for the vehicle is inserted into a power socket (cigar lighter socket) for the vehicle. So, the power is obtained from the vehicle power supply (battery).

Power sockets with expansion cables are sold and widely used because the power sockets that are standard equipment on vehicles cannot cover power distribution. As for the power socket, a power socket with a lock mechanism has been proposed in order to prevent the power socket from coming off when the plug is inserted as in Patent Document 1 or Patent Document 2.

In the locking mechanism of any of the documents, the socket main body has a structure in which a notch is provided on the outer peripheral portion on the opening side, and the outer peripheral surface of the plug and the socket are pressed against each other by the elastic diameter reducing action of the notched portion. By the pressure welding, the friction between the socket and the plug keeps the plug inserted state and prevents the plug from coming off due to vibration of the vehicle or the like.

Utility model registration No. 3190274

Utility model registration No. 3205246

However, in the lock mechanism, since the friction between the plug and the socket body due to partial contact is used, the frictional force against the plug coming off may not be sufficiently exerted.

Further, since there is a clearance between the members, poor contact may occur between the plug and the electrode portion in the socket due to the ingress of water or dust. On the other hand, if the structure of the socket is complicatedly formed so as to provide a notch, the strength may be affected and it may not be able to withstand excessive pressure welding.

In view of the above problems, the present invention has a power source having sufficient durability, dustproofness and drip-proofness by facilitating the insertion and release of the plug and surely preventing the plug from coming off due to vibration or impact of the vehicle. The purpose is to provide a socket.

In order to achieve the above object, the invention according to claim 1 is a vehicle power socket composed of a socket body, a ring-shaped elastic body and a cap member, into which a plug is inserted and mounted, and the socket body is a socket body. A threaded portion is formed on the outer peripheral surface, and a first cylindrical hole that is a plug insertion hole, a second cylindrical hole that is shallow on the coaxial center in the outer peripheral direction from the opening end of the first cylindrical hole, and the first cylindrical hole. It has a two-stage cylindrical structure having a socket end side arranged so as to extend in the outer peripheral direction from the second cylindrical hole, and the cap member has a screw portion screwable with a screw portion of the socket body. A third cylindrical hole formed on the inner peripheral surface and having the same diameter as the second cylindrical hole and on the coaxial center, and a cap end arranged so as to extend in the outer peripheral direction from the third cylindrical hole. The ring-shaped elastic body provided with a side portion is placed between the second cylindrical hole and the third cylindrical hole, and has an inner diameter and a second cylinder approximately the same size as the diameter of the first cylindrical hole. It has an outer diameter approximately the same as the diameter of the hole, and when the plug is attached, the plug is passed through the cap member and the ring-shaped elastic body, inserted into the socket body, and the ring-shaped elastic body is inserted. It is a power socket for a vehicle characterized in that the socket positive electrode member in contact with the plug positive electrode portion is concave in contact with the socket end edge portion and the cap end edge portion.

In the invention according to claim 2, the ring-shaped elastic body forms a slit groove or a dent on the outer peripheral surface or the inner peripheral surface, thereby gently causing strain expansion related to elastic deformation of the elastic body, and the cap member. It has the feature of smoothing the rotation of.

The invention according to claim 3 has a truncated cone shape in which one or both of the end face portions of the ring-shaped elastic body is inclined in the axial direction, and the second cylinder on the side in which the end face portion of the truncated cone shape is stored. It has the characteristic that the bottom of the hole or the third cylindrical hole has a conical slope shape that is in contact with the truncated cone shape, and has a structure that causes a strong frictional force.

According to the present invention, the elastic deformation of the ring-shaped elastic body causes a strong frictional force with the outer peripheral surface of the plug, and the frictional force stably holds the mounted state of the plug. As a result, it is possible to reliably prevent electrical contact failure due to disconnection of the plug due to vibration of the vehicle or movement in the disconnection direction.

In addition, elastic deformation enhances the adhesion between members, thereby achieving high dust resistance and drip resistance, and suppressing deterioration of the electrode contact portion. In addition, the smooth pressure welding operation facilitates the insertion and release of the plug, and has the effect of suppressing scratches or breakage of parts and increasing durability.

It is an exploded side view which shows the embodiment of the plug insertion standby. It is sectional drawing side view with the plug inserted. It is a front view and a side view in each example of a ring-shaped elastic body, and (a) is a figure which shows the shape of Example 1. FIG. (B) is a figure showing the shape of Example 2. (C) is a figure showing the shape of Example 3. (D) is a diagram showing a shape having the features of Examples 1 to 3. It is a schematic diagram which enlarged the main part of the compression structure of FIG. (B) is a figure which shows the state of elastic deformation by screw compression. FIG. 2A is an enlarged schematic view of a main part of the compression structure of FIG. 2A according to the third embodiment, and FIG. (B) is a figure which shows the state of elastic deformation by screw compression. It is sectional drawing of the main part of the compression structure which shows the variation which concerns on this invention, and (a) is the figure which shows the example of the ring-shaped elastic body which has a concave cross section. (B) is a figure showing an example of a cap member having no corner side portion. (C) is a figure showing a form example in which the end face portion of a ring-shaped elastic body having a truncated cone shape is placed on the second cylindrical hole side on the socket body side. (D) is a figure which shows an example of a form in which a truncated cone shape is formed on both end faces of a ring-shaped elastic body.

<Overview>
The present invention is characterized by a simple compression structure in which a ring-shaped elastic body undergoes appropriate elastic deformation and a shape of the ring-shaped elastic body. The embodiments are shown in FIGS. 1 to 3, and the action and effect will be described with reference to FIGS. 4 to 6. It should be noted that FIGS. 1 and 2 are shown in a form having all the features according to the embodiment described later.

<Structure>
A power socket for a vehicle composed of a socket body 10, a cap member 20 and a ring-shaped elastic body 30, and a plug 40 of an electric vehicle for a vehicle passes through the cap member 20 and the ring-shaped elastic body 30 to the socket body 10. It is inserted and the cap member 20 is rotated to be screwed and attached to the socket body.

The socket body 10 is a bottomed cylinder made of an insulating resin, and has a socket screw portion 11 (male) formed on the outer peripheral surface thereof, and a first cylindrical hole 12 which is a plug insertion hole and the first cylinder hole 12. It has a two-stage cylindrical structure having a shallow second cylindrical hole 13 on the coaxial center in the outer peripheral direction from the opening end of the cylindrical hole 12.

The cap member 20 has a plug opening for inserting a plug 40, and a cap screw portion 21 (female) that can be screwed with the socket screw portion 11 is formed on the inner peripheral surface, and the diameter is a second cylinder. A third cylindrical hole 22 having the same size as the hole 13 and on the coaxial center is provided.

The ring-shaped elastic body 30 is placed between the second cylindrical hole 13 and the third cylindrical hole 22, and is compressed by the rotation and screwing of the cap member 20 (hereinafter, screwing). Abbreviated as compression).

Here, the ring-shaped elastic body 30 has a ring thickness in which the inner diameter is substantially the same as the diameter of the first cylindrical hole 12 and the outer diameter is substantially the same as the diameter of the second cylindrical hole 13. Since it is an elastic body, there is little hindrance even if the size fluctuates, and it may be smaller than the storage space in order to secure a clearance for absorbing strain expansion related to elastic deformation described later.

Further, when the socket body 10 and the cap member 20 are screwed together during screw compression, the socket end side portion 16 and the cap end side portion 23 at the bottom of the cap member do not come into contact with each other (that is, the screw is not closed). ), The ring-shaped elastic body 30 has a width L (FIG. 3, hereinafter abbreviated as a screwing movable width) that can be compressed and reduced and moved.

The electric power is typically such that the plug negative electrode portion 41 having leaf spring elasticity comes into contact with the metal ground ring 15 mounted on the inner surface of the cylinder of the first cylindrical hole 12 of the socket body 10, and the tip of the plug having a spring structure has a spring structure. The protruding plug positive electrode portion 42 elastically urges and contacts the socket positive electrode member 14 at the bottom of the socket body 10 to receive supply. Inside the bottom of the socket body 10, an electric wiring member connected to the ground ring 15 and the socket positive electrode member 14 is provided, and is led out from the bottom of the socket body 10 to the outside and connected to a vehicle power supply (battery).

<Selection of elastic material>
As the material of the ring-shaped elastic body 30, hard ethylene, propylene diene, and rubber widely used as industrial rubber products are adopted as a standard in consideration of friction coefficient, durability, weather resistance, and the like. There are various elastic materials, but it is possible to select other varieties by experimental trials while considering the characteristics of the elastic body based on this adoption.

Hereinafter, the features of each embodiment and their actions will be described.

In this example, the ring-shaped elastic body 30 has a simple rectangular shape as shown in FIG. 3A. FIG. 4 is an enlarged schematic view of a main part A of the compression structure of FIG. In this example, the end surface of the ring-shaped elastic body 30 in contact with the cap member 20 is vertical, and the facing socket body side is also vertical (FIG. 4A).

The ring-shaped elastic body 30 is elastically deformed as shown in FIG. 4 (b) by applying a compressive force W by spiral compression from the stored state before compression in FIG. 4 (a).

At the beginning of screw compression, the normal force from the facing side becomes the drag force, and the strain expansion fills the clearance between the members while balancing with the internal stress of the elastic body (black arrow in FIG. 4 (b)). .. The compressive force W corresponds to the normal force from the compression surface against elastic rebound due to screw compression.

If the torsional compression is further applied, the strain expansion related to the elastic deformation is suppressed by the inner wall surface of the cap member 20 and the socket body 10, and is balanced with the drag force received from the wall surface against the increase in the internal stress. In the example of FIG. 4B, it is shown that the screwing movable width L is reduced by the width of one rotation of the screw, and the design of L can be changed within a range in which an appropriate width is secured.

Here, the strain expansion on the inner surface side of the ring of the ring-shaped elastic body 30 expands the area in contact with the outer peripheral surface of the plug, and applies pressure related to the increase in internal stress to the outer peripheral surface of the plug. The pressure, combined with the ring-shaped elastic body 30 having a high coefficient of friction and the expansion of the pressure contact area, causes a frictional force between the outer peripheral surface of the plug. It has a structure that creates a frictional force between the ring-shaped elastic body and the plug to stably hold the plug insertion.

On the other hand, the strain expansion on the outer peripheral surface side of the ring is attracted to the gap between the socket end side portion 16 and the cap end side portion 23, and is greatly generated by stress concentration (FIG. 4 (b)). The cap member 20 slides and screwed while the corner side portion 24 engages with the strain expansion. However, when the strain expansion increases, the engaging force of the square side portion 24 also increases, and the cap member 20 may reach the limit where it cannot be screwed. This can be solved in consideration of the adjustment of the reduced movable width L, the selection of the elastic material, and the like, but the problem that the spiral compression is limited remains.

From the above problem, in this example, as shown in FIG. 3B, a square-shaped slit-shaped groove 31 (hereinafter, abbreviated as a slit groove) is formed in the width direction of the outer peripheral surface of the ring elastic body. The slit groove shows an example of eight formations in the width direction.

According to this shape, although not shown, (1) strain expansion of the ring-shaped elastic body 30 in the outer peripheral surface direction is also attracted to and relaxed on the inner surface of the slit groove 31. (2) The corner side portion 24 of the cap member does not engage with the groove portion, and the engaging force itself becomes weak. (3) The volume of the ring-shaped elastic body 30 in the compression direction is reduced, and the elastic rebound is reduced. Therefore, the screw compression becomes loose.

Due to the above action, compared with the ring elastic body having the rectangular parallelepiped cross section of Example 1, the spiral compression becomes smoother and the compression adjustment can be performed well.

The number and size of the slit grooves 31 can be changed, and a shape such as a semi-cylindrical body can be adopted even if the shape is not a tetrahedron. FIG. 6A is a form showing one variation of the ring-shaped elastic body 30, and the outer peripheral surface of the ring-shaped elastic body 30 has a concave shape. Further, it may be partially formed on the outer peripheral surface. The dent relaxes the strain expansion and obtains the same effect as described above.

Considering the stress concentration at the bottom of the recess, a slit groove formed in the width direction from the end face of the ring-shaped elastic body 30 is suitable from the viewpoint of durability. Even if the slit groove 31 is formed on the inner peripheral surface side of the ring-shaped elastic body 30, the same effect as described above can be obtained. However, since the slit groove on the inner peripheral surface creates a clearance with the outer peripheral surface of the plug, it is better to form the slit groove on the outer peripheral surface for dustproof or drip-proof property.

Further, it is also possible to weaken the engaging force with the strain expansion even if the corner side portion 24 has a shape in which the corners are cut off or rounded (FIG. 6 (b)).

In this example, as shown in FIG. 3C, the elastic body end face portion 32 of the ring-shaped elastic body 30 is formed in a truncated cone shape inclined in the axial direction, and the third cap member 20 to be housed is formed. The bottom of the cylindrical hole is characterized by being formed in a conical slope shape tangent to the truncated cone shape.

5A and 5B are schematic views showing the operation of this example, and FIG. 5A shows a storage state of the ring-shaped elastic body 30 before compression. Here, the compressive force W due to screw compression (FIG. 5B) is applied to the slope of the end face portion 32 of the elastic body, and is decomposed into a force W2 in the horizontal direction and a force w1 in the normal direction with respect to the slope. The internal stress for compression by the forces w1 and w2 fills the clearance between the members while causing strain expansion.

When the strain expansion fills the clearance between the outer peripheral surface of the plug 40 and the ring-shaped elastic body 30, the ring-shaped elastic body 30 comes into close contact with the outer peripheral surface of the plug 40. In the close contact surface, the force W1 can be decomposed into a vertical force y and a horizontal force x (FIG. 5B), but a pressure corresponding to the y is directly applied to the outer peripheral surface of the plug, and the plug 40 A strong frictional force is generated between the outer peripheral surface of the ring-shaped elastic body 30 and the ring-shaped elastic body 30. Therefore, the plug insertion state is maintained more stably.

FIG. 3D shows the shape of the ring-shaped elastic body having the characteristics of Examples 1, 2 and 3, and is most suitable. In addition, this Example 3 is an example in which a truncated cone-shaped elastic body end face portion 32 is placed on the cap member 20 side. As shown in FIG. 6 (c), the truncated cone-shaped elastic body end face portion 32 is placed on the side of the second cylindrical hole 13 of the socket body 10, or as shown in FIG. 6 (d), the truncated cone shape. Even if both of the end face portions 32 of the elastic body have a truncated cone shape, the same effect as described above can be obtained.

In this example, the socket positive electrode member 14 has a concave shape. (Figs. 1 and 2). The contact area with the plug positive electrode portion 41 is widened to reduce electrical contact defects. A rivet-shaped metal member is suitable.

During the screw compression, if the ring-shaped elastic body 30 is compressed and reduced and comes into close contact with the outer peripheral surface of the plug 40, it acts in the direction of pushing the plug 40. The positive electrode portion of the plug repels in the pushing direction due to the elastic force, but the friction with the outer peripheral surface of the plug 40 in the close contact state acts as a drag against the repulsion, suppressing the displacement of the positive electrode portion of the plug and electrically. Make good contact. It will reduce contact mistakes due to camera shake during mounting.

As shown in the above examples, in addition to the effect that elastic deformation causes friction to hold the plug inserted, the clearance between the socket body 10, the cap member 20 and the plug 40 in the cylindrical hole into which the plug is inserted is a ring. High drip-proof and dust-proof properties are realized by eliminating the elastic deformation of the elastic body 30.

Further, even if there is excessive screw compression, it is absorbed by elastic deformation, physical damage (scratches, breakage, etc.) of the member is reduced, and durability is improved. Further, since the sot main body 10 does not require complicated molding due to a simple structure with a small number of parts, there is an effect that the manufacturing cost can be reduced.

<Measurement of pull-out force>
In an experiment comparing the pull-out force of the plug between the prototype and the similar product according to the present invention, it was confirmed that the similar product has a pull-out force of about 70 to 100 N and the prototype has a pull-out force of about 150 N. The prototype applies the form of the slit groove 31 and the truncated cone-shaped elastic end face portion 32 shown in FIG. 4 (d), and the insertion and tightening of the plug gives a torque of 80 to 90 N, and the removal speed is 2 mm. It is set to / s. Three types of plugs to be tested are selected, and the measured value of the withdrawal force is the average of the three types. While the pulling power of similar products varies depending on the plug type, this prototype shows stable values.

The outer diameter of the socket body 10 and the cap member 20 can be freely changed to a polygonal cylinder shape, etc., not limited to a cylindrical shape, as long as it has a screw portion to be screwed. A non-slip may be formed.

10 Socket body 11 Socket threaded part 12 First cylindrical hole 13 Second cylindrical hole 14 Socket positive electrode member 15 Earth ring 16 Socket end side part 20 Cap member 21 Cap threaded part 22 Third cylindrical hole 23 Cap end side part 24 Square side 30 Ring-shaped elastic body 31 Slit groove 32 Elastic body end face 40 Plug 41 Plug negative side 42 Plug positive side A Main part of compression structure W Compressive force w1 W is decomposed Normal force x w1 is decomposed Horizontal force y w1 decomposed vertical force w2 W decomposed slope force L Compressive movable width

Claims (3)

A power socket for vehicles that consists of a socket body, a ring-shaped elastic body, and a cap member, and is fitted with a plug inserted.
The socket body has a threaded portion formed on the outer peripheral surface, a first cylindrical hole which is a plug insertion hole, and a shallow second cylinder on the coaxial center in the outer peripheral direction from the opening end of the first cylindrical hole. It comprises a two-stage cylindrical structure having a hole and a socket end edge arranged so as to extend outward from the second cylindrical hole.
The cap member has a threaded portion of the socket body and a threaded portion that can be screwed on the inner peripheral surface thereof, and has a diameter of the same size as the second cylindrical hole and a third cylindrical hole on the coaxial center. It is provided with a cap end edge arranged so as to extend in the outer peripheral direction from the third cylindrical hole.
The ring-shaped elastic body is placed between the second cylindrical hole and the third cylindrical hole, and has an inner diameter of substantially the same size as the diameter of the first cylindrical hole and substantially the same as the diameter of the second cylindrical hole. Equipped with an outer diameter of size,
When the plug is attached, the plug is passed through the cap member and the ring-shaped elastic body, inserted into the socket body, and comes into contact with the ring-shaped elastic body, and the socket end edge portion and the cap-shaped elastic body end thereof. Do not touch the sides,
A power socket for a vehicle characterized in that the socket positive electrode member in contact with the positive electrode portion of the plug has a concave shape . The vehicle power socket according to claim 1, wherein the ring-shaped elastic body has a slit groove or a recess formed on an outer peripheral surface or an inner peripheral surface. The end face portion of one or both of the ring-shaped elastic bodies has a truncated cone shape inclined in the axial direction, and the second cylindrical hole or the third cylindrical hole on the side where the end face portion of the truncated cone shape is placed. The vehicle power socket according to claim 1 or 2, wherein the bottom portion thereof has a conical slope shape tangent to the truncated cone shape.

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