JP2014222612A - Attachment plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment plug which allows an operator to easily assemble a plug blade etc. to a core thereby enabling easy manufacturing and prevents unexpected damages during and after the manufacturing to obtain sufficient functions.SOLUTION: An attachment plug 11 includes: a core 13 which holds a plug blade 12 and a ground terminal 15 at predetermined locations and includes a fuse 16 and a temperature sensor 19 for safety; and a plug body 14 which is integrally molded with the core 13, on which necessary components such as the plug blade 12 are mounted, by a synthetic resin so as to cover the core 13 excluding a front end surface 31 where the plug blade 12 protrudes. In the attachment plug 11, a rubber core having rubber elasticity is used as the core 13.

Description

  The present invention relates to a plug that is preferably used in a charging facility for supplying power to a device such as an electric vehicle or a hybrid vehicle.

  In order to ensure safety from overheating and large currents, plug sockets with a built-in temperature sensor (thermistor) and fuse have been proposed.

  As an example of a built-in temperature sensor, there is an insertion plug disclosed in Patent Document 1 below. This insertion plug incorporates a thermistor at a position very close to the front end surface between the two plug blades.

  Specifically, after inserting the plug blade and the thermistor into a pre-molded core, the insertion plug is made of synthetic resin with the plug body, including part of the cord, on the entire portion excluding the front end surface of the core. The hole for holding the thermistor is deeply formed to a position close to the front end surface of the core.

  Since it is such a structure, the thermistor can detect correctly the temperature change which arises in the front end surface of an insertion plug, and safety | security can be ensured.

  However, there are plugs that require a ground terminal (ground electrode) from the viewpoint of further safety, such as those for charging electric vehicles. In addition to the thermistor, a fuse may be required.

  In such a plug, the number of necessary parts to be mounted on the core increases and the shape becomes complicated. In addition, since the plug blade and the ground terminal must be within a predetermined range in a predetermined arrangement, the relationship between the necessary parts must be close.

  However, since the core was molded from a thermosetting resin, there was a risk of damage when dropped. Since the core has a complicated shape as described above, it is easily damaged. In addition, since the necessary parts must be closely assembled as described above, it is not easy to insert and fit the necessary parts into the hard core. Because it was a difficult and difficult task, there was a high risk of the core falling unexpectedly.

  Still, if the insertion direction of the plug blade etc. into the core is the same as the extension direction of the cord connected to the plug blade etc., the work from assembly to molding of the plug body can be performed relatively smoothly. In the case of an insertion plug having a shape in which the extending direction of the plug is bent in a direction intersecting with the insertion direction of the plug blade, the cord must be bent, so that the assembling work becomes difficult.

  If the core is dropped during the assembling operation, not only the core is damaged, but also necessary parts are damaged depending on the situation of dropping.

Japanese Patent No. 4031026

  Accordingly, the main object of the present invention is to make it easy to manufacture without unexpected damage and to obtain sufficient performance.

  For this purpose, a synthetic resin is coated so as to cover a core on which necessary parts including a plug blade are mounted, and a portion excluding the front end surface from which the plug blade protrudes with respect to the core on which the necessary parts are mounted. The plug is provided with a plug body that is integrally formed with the plug, wherein the core is formed of rubber.

  In this configuration, even when the core is dropped during work in which necessary parts are assembled, the core is free from damage by its own rubber elasticity. In addition, in the assembling work, even if the assembling work is complicated and complicated, the core is deformed by the rubber elasticity and can be easily inserted and fitted. In this way, the core suppresses the generation of defective products.

  In the inserted plug after manufacture, the core has its own rubber elasticity and the plug body that covers the core, so that the necessary parts of the plug blade are held in an appropriate position, and the insulation and heat resistance of the rubber , Ensure safety.

  According to this invention, since the core has rubber elasticity, there is no unexpected damage in the manufacturing process, and the production of defective products can be suppressed and easy manufacturing can be realized. Moreover, sufficient safety as an insertion plug can be obtained due to the high insulation and heat resistance of the rubber.

The longitudinal cross-sectional view which shows the internal structure of a plug. The side view of a plug. The front view which shows the front end surface of a plug. The top view which shows the state before the assembly | attachment of an insertion plug. The cross-sectional view which shows the internal structure of a plug.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
1 is a cross-sectional view showing the internal structure of the plug 11, FIG. 2 is a side view of the plug 11, and FIG. 3 is a front view showing the front end face of the plug 11.

  As shown in these drawings, the plug 11 has necessary parts including a plug blade 12, a core 13 on which these are mounted, and the plug blade 12 on the core 13 on which the required parts are mounted. The plug body 14 covers the entire portion excluding the front end face 31.

  The necessary parts include two plug blades 13, one ground terminal 15, a fuse 16, and two fuse terminals 17 that hold the fuse 16 in a detachable manner and are electrically connected. A cover member 18 to be attached to a portion where the fuse terminal 17 is assembled and a temperature sensor 19 for detecting overheating are provided.

  The plug blade 12 is provided so as to protrude from the front end surface 31 of the core 13, and as shown in FIG. 4, is an intermediate portion in the longitudinal direction, and the front end surface 31 of the core 13 and the vicinity thereof. An insulating cap 21 made of a synthetic resin excellent in heat resistance and insulation, such as polybutylene terephthalate, is provided in a portion corresponding to the above. A cylindrical crimping portion 24 that connects the conductors 22a and 23a of the cords 22 and 23 is integrally formed at the upper end portion of the plug blade 12 that fits in the core 13.

  After the conductors 22a and 23a of the cords 22 and 23 are inserted into the crimping part 24, they are crimped and directly connected. A highly insulating insulating adhesive tape 25 made of glass cloth tape, mica tape, or the like is coated thereon to improve heat resistance and connection strength. The illustration of the insulating adhesive tape 25 is omitted for convenience in FIGS. 1, 2, and 5.

  The ground terminal 15 is also provided so as to protrude from the front end surface 31 of the core 13, and a cylindrical crimping portion 52 that connects the conductor 51 a of the cord 51 is integrally formed at the upper end portion that fits in the core 13. Is formed.

  The fuse 16 is a power fuse that cuts off the short-circuit current and protects the circuit. A thermal fuse may be provided.

  The fuse terminal 17 has a shape bent in an L shape in plan view, and has a clip portion 72 having a pair of clip pieces 71 for holding the fuse 16 at one end. A positioning hole 73 for positioning is formed in a portion between the clip pieces 71 in the clip portion 72.

  A bent portion 74 that bends in an L shape is formed below the portion bent from the clip piece 71 in an L shape in plan view, and the conductor 23a of the cords 23 and 75 is formed at the other end of the clip piece 71. , 75a are joined by crimping.

  The two fuse terminals 17 have a bilaterally symmetric shape, and are arranged so that the crimping portion 76 is located on the inner side in the left-right direction than the clip portion 72.

  The cover member 18 is a plate-like member provided on the upper surface of the core 13 where the fuse terminal 17 is attached (the surface on the side where the plug body 14 is formed to cover), and accommodates the fuse 16 when the plug body 14 is formed. This is to prevent inconvenience that the resin enters the portion. The cover member 18 is formed of a synthetic resin or rubber having heat resistance and insulating properties.

  The temperature sensor 19 is composed of, for example, a thermistor or a varistor, and is connected to a current interrupt device (not shown) via signal lines 91 and 92. Based on the temperature detected by the temperature sensor 19, the current interrupting device determines whether or not it is overheated to a predetermined temperature. If it is determined that the overheating occurs, the current interrupting device interrupts the current.

  The core 13 has such a shape that all of these necessary parts can be mounted, and is made of rubber having both heat resistance and insulation. As the rubber, for example, silicone rubber (silicon rubber), FPM (fluoro rubber), EVA (ethylene / vinyl acetate rubber) and the like can be suitably used.

  The core 13 includes a plate-like portion 32 that has a shape in which the two upper corners of the square are chamfered in a plan view, and the vertical direction perpendicular to the surface direction is formed on the upper and lower surfaces of the plate-like portion 32. And a through hole penetrating in the vertical direction.

  Specifically, a plug blade hole 33 for inserting the plug blade 12 is provided in a portion near the left and right sides of the lower side having corners in the plate-like portion 32. As shown in FIG. 3, the two plug blade holes 33 hold the plug blade 12 with the long sides of the plug blade 12 laid sideways, so that the flat surface of the plug blade hole opening 33a of the front end surface 31 is provided. The visual shape is a rectangle that is long in the horizontal direction, and is formed on a straight line in the left-right direction with a predetermined interval.

  These plug blade holes 33 hold the upper end portion of the plug blade 12 and project the front end side from the front end surface 31 from the insulating cap 21 portion of the plug blade 12.

  One ground hole for holding the ground terminal 15 is located at a position away from the two plug blade holes 33 in the core 13 in a direction perpendicular to the horizontal direction that is the arrangement direction of the plug blade holes 33. 34 is provided.

  The ground hole 34 is provided at a position to form an isosceles triangle with a base line connecting the two plug blade holes 33 between the two plug blade holes 33, and the long side of the ground terminal 15 extends vertically. In order to hold in the state, the plan view shape of the ground hole opening 34a of the front end face 31 is a vertically long rectangle.

  As shown in FIG. 1, a fuse housing portion 35 for housing the fuse 16 is formed between the plug blade hole 33 and the ground hole 34 in the core 13. The fuse accommodating portion 35 is a rectangular shape that extends horizontally in the left-right direction, and opens in the front end surface 31 of the core 13. That is, the front end surface 31 of the core 13 has a fuse housing portion opening 35 a for inserting and removing the fuse 16, and the upper surface side of the core 13 is the bottom of the fuse housing portion 35.

  An appropriate number of ribs 35b (see FIG. 1) for receiving the fuse 16 are formed in a portion corresponding to the bottom of the fuse accommodating portion 35, and the fuse terminal 17 is held on both sides in the left-right direction.

  Since the fuse terminal 17 has the shape having the pair of clip pieces 71 as described above, the clip piece insertion hole 35c is formed at a position corresponding to the clip piece 71 in a portion corresponding to the bottom of the fuse housing portion 35. A positioning protrusion 35d penetrating the positioning hole 73 is formed on the upper surface between the clip piece insertion holes 35c.

  The crimping part holding part 36 that holds the crimping part 76 at the other end of the fuse terminal 17 in the core 13 is formed adjacent to the position between the two left and right plug blade holes 33. The crimping part holding part 36 has a concave shape that is recessed to the height of the upper surface of the plate-like part 32. Since the plug blade hole 33 is formed as a hole and the crimping part holding part 36 is formed as a recess, a partition wall 37 exists between the plug blade hole 33 and the crimping part holding part 36, so Insulation can be obtained. The partition wall 37 is extended upward by an appropriate length.

  Between the crimping part holding | maintenance parts 36, the intermediate partition 38 which performs insulation between both is provided. The intermediate partition wall 38 extends to the upper surface of the fuse accommodating portion 35, and the upper end height is the same throughout the longitudinal direction. A temperature sensor holding portion 38 a that extends in the vertical direction and holds the temperature sensor is formed in the intermediate partition wall 38 positioned between the two crimping portion holding portions 36. The temperature sensor holding portion 38 a is formed at a longitudinal end portion of the intermediate partition wall 38 as a cylindrical hole that accommodates the temperature sensitive portion of the temperature sensor 19.

  In addition, since the cover member 18 is attached to the upper surface of the core 13 corresponding to the bottom of the fuse accommodating portion 35, a concavo-convex shape is formed so that a good attachment state without a gap can be maintained. In other words, the cover member 18 has a substantially rectangular plate shape that is long in plan view, and the upper surface of the fuse accommodating portion 35 has a ridge formed in a frame shape on the lower surface of the cover member 18 in order to enhance the coupling state with the cover member 18. A recessed groove 35e that fits into 81, a fitting hole 35f into which a fitting protrusion 82 formed on the lower surface of the cover member 18 fits, a fitting recess 83 that fits into the positioning protrusion 35d, and the central partition wall 38. A fitting groove 84 for fitting is provided.

  As shown in FIG. 1, a step portion 35g is formed on the opening side in the fuse housing portion 35, and a synthetic resin fuse cover 61 excellent in heat resistance and insulation can be attached to and detached from the step portion 35g. It is attached. The fuse cover 61 includes a locking piece 62 having a locking claw 62 a that locks to a locked portion 35 h formed in the fuse housing portion 35.

  The fuse housing opening 35a, the plug blade hole opening 33a, and the ground hole opening 34a in the core 13 are flush with each other (see FIG. 1).

  In addition, the plate-like portion 32 of the core 13 is appropriately provided with a through hole 32a through which the synthetic resin forming the plug body 14 passes in order to increase the bonding strength and the integrity with the plug body 14.

  The plug body 14 is formed into an appropriate shape by covering the portion excluding the front end face 31 of the core 13 with the cords 22, 23, 51, 75, 91, and 92 together. For the plug body 14, an appropriate synthetic resin such as polyvinyl chloride can be used.

  The flag body 14 of the plug 11 in this example has a shape that extends the cords 22, 51, etc. connected to the plug blade 12 etc. in a direction intersecting the longitudinal direction of the plug blade 12. The cords 22, 51 and the like are integrated into the exterior material 11a.

  The insertion plug 11 having such a structure is formed by first forming the core 13 into a predetermined shape, and incorporating necessary parts such as a plug blade 12 into the core 13 in a predetermined location, and then FIG. As shown, the cords 22, 23, 51, 75 and the signal lines 91, 92 are arranged in a desired state, and the terminal portion of the exterior material 11a is bound by the binding tool 11b. Thereafter, these are housed in a mold and the plug body 14 is molded. The binding tool 11a contributes to maintaining a certain positional relationship between the cords 22, 23, 51, and 75 and the signal lines 91 and 92, and suppresses an excessive load from being applied to the local portion after the formation.

  Since the core 13 is made of rubber, it will not be damaged by impact even if it is dropped. Even if it is stepped on, it will not crack, and the core 13 will be quickly restored to its original shape by rubber elasticity.

  In addition, when the necessary parts are assembled into the core 13, the necessary parts are complicated to pierce the plug blade 12 or the like, or the shape of the core 13 is complicated. When force is applied, the core 13 itself is deformed by rubber elasticity. For this reason, a required part can be attached easily and there is no possibility of damaging the core 13 and a required part unexpectedly.

  Therefore, it is possible to suppress the generation of defective products during manufacturing, and the manufacturing work is easy.

  In particular, in the case of the plug 11 having the above-described shape in which the cords 22 and 51 connected to the plug blade 12 and the ground terminal 15 extend in the direction intersecting the longitudinal direction of the plug blade 12 and the ground terminal 15, the plug blade 12 must be bent at a hard portion wound with the insulating adhesive tape 25 close to the joint portion between the cords 22 and 51, and an insertion operation involving such bending can be easily performed.

  Moreover, the conductors 22a, 23a, 51a of the cords 22, 23, 51 connected to the plug blade 12 and the ground terminal 15 are directly crimped and connected to the crimping portions 25, 52 formed integrally with the plug blade 12 and the ground terminal 15. Therefore, the bending is basically not easy, but even in such a case, the assembling work can be facilitated, and the advantage of reducing the contact resistance by directly pressing can be enjoyed.

  In the core 13 on which the necessary parts are mounted, each necessary part is held at a predetermined position by its own rubber elasticity, and even if it is deformed, it is quickly returned to the predetermined position. In particular, the fuse 16 and the temperature sensor 19 are elastically supported to protect them from impact. The plug body 14 also assists in maintaining the shape of the core 13 and holds necessary parts such as the plug blade 12 in an appropriate position.

  The fuse housing portion 35 for housing the fuse 16 is formed at a position sandwiched between the plug blade hole 33 and the ground hole 34, and the plug body 14 is integrally formed on the outer periphery thereof. Even if the rubber has rubber elasticity, it is possible to suppress the fuse housing portion 35 from being unnecessarily deformed. That is, while the fuse 16 can be securely stored, the fuse cover 61 can be easily attached and detached by the rubber elasticity of the core 13, so that the fuse 16 can be easily and quickly replaced.

  The core 13 has insulation and heat resistance, protects necessary parts, and necessary parts such as the temperature sensor 19 and the fuse 16 keep the circuit safe and prevent the occurrence of a fire or the like. That is, when an abnormality occurs due to overheating or a large current, the current can be interrupted by the temperature sensor 19 or the fuse 16. Maintenance of this function is assisted by a rubber core 13 having rubber elasticity, insulation and heat resistance. For this reason, the highly safe plug 11 is obtained.

  Since the temperature sensor 19 for ensuring safety is provided in a portion sandwiched between the plug blade 12 and the ground terminal 15, temperature detection can be accurately performed.

  As described above, with the plug 11 having the above-described configuration, there is no unexpected damage in the manufacturing process, and generation of defective products can be suppressed, and easy manufacturing can be realized. In addition, sufficient safety as a plug is obtained.

In the correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
The necessary parts of the present invention correspond to the plug blade 12, the ground terminal 15, the fuse 16, the fuse terminal 17, the cover member 18, and the temperature sensor 19,
Similarly,
The connection part of the fuse terminal corresponds to the crimping part 76,
The terminal connection part holding part of the core corresponds to the crimping part holding part 36,
The present invention is not limited to the configuration of the above-described one form, and other configurations can be adopted.

DESCRIPTION OF SYMBOLS 11 ... Insert plug 12 ... Plug blade 13 ... Core 14 ... Plug body 15 ... Ground terminal 16 ... Fuse 17 ... Fuse terminal 18 ... Cover member 19 ... Temperature sensor 22, 23 ... Code 22a, 23a ... Conductor 24 ... Crimp part 31 ... Front end face 33 ... Plug blade hole 34 ... Ground hole 35 ... Fuse accommodating part 35a ... Fuse accommodating part opening 36 ... Crimping part holding part 38a ... Temperature sensor holding part

Claims (5)

It is integrally formed with a synthetic resin so as to cover the core on which necessary parts including the blade are mounted and the core on which the necessary parts are mounted except for the front end surface from which the blade protrudes. A plug with a plug body,
An insertion plug in which the core is formed of rubber. The plug according to claim 1, wherein a cord connected to the plug blade extends in a direction intersecting with a longitudinal direction of the plug blade. The plug according to claim 1 or 2, wherein a conductor of a cord connected to the plug blade is directly crimped and connected to a crimp portion integrally formed with the plug blade. The insertion plug according to any one of claims 1 to 3, further comprising a ground terminal, a fuse, and a temperature sensor that detects overheating in addition to the plug blade as the necessary component. The core includes two plug blade holes for inserting the plug blades side by side,
One ground hole into which the ground terminal is inserted is provided at a position away from these plug blade holes in a direction perpendicular to the arrangement direction of the two plug blade holes,
Between the plug blade hole and the ground hole, a fuse housing portion for housing the fuse is formed in a shape that is long in the left-right direction, and the fuse housing portion is opened in the front end surface,
A terminal connecting portion holding portion for holding a connecting portion to a conductor of a cord in a fuse terminal holding the fuse in the fuse accommodating portion is formed at a position between the plug blade holes;
The plug according to claim 4, wherein a temperature sensor holding part for holding the temperature sensor is formed at a position between the terminal connection part holding parts.

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