JP2020194619A - Connection terminal body, manufacturing method of connection terminal body, and method of attaching conductor wire material to connection terminal body - Google Patents

Abstract

To provide a connection terminal body that can be attached as it is to realize good electrical connection even for a conductor wire having an insulating coating.SOLUTION: A connection terminal body 100 includes a connection plate 120 bent to a reference bending angle α which is less than 90° with respect to a fixing plate 110 fixed at a required position. A first connecting arm 121 and a second connecting arm 122 facing each other via an introduction slit 123 narrower than the diameter of a conductor wire material to be attached are provided on the tip side of the connection plate 120, and on the tip side thereof, a first tip introduction region 124a and a second tip introduction region 124b which are thinner than the plate thickness of the connection plate 120, are formed. First and second stepped edge portions 125a and 125b are formed at the boundary where the thickness of the thin first and second tip introduction regions 124a and 124b returns to the plate thickness of the connection plate 120, and an insulating film on the surface of the conductor wire material press-fitted into the introduction slit 123 can be suitably scraped.SELECTED DRAWING: Figure 1

Description

The present invention provides a connection terminal body that electrically holds a conductor wire rod having a circular cross section provided in a connection component that is electrically connected to another component, a manufacturing method thereof, and a conductor wire rod to the connection terminal body. The present invention relates to a method of attaching a conductor wire to a connection terminal body.

Discrete parts such as diodes and capacitors are provided with a conductor wire having a circular cross section, and are connected to the printed wiring on the circuit board or to the connection terminal body for external connection via this conductor wire. To do. For example, the ignition coil unit for an internal combustion engine is provided with a primary coil or a secondary coil to which a high voltage is applied, a large diode having a high withstand voltage, and the like. Connect the diode lead (conductor wire) and the tip of the coil (conductor wire) to the connection terminal body, and electrically connect to the power supply line, ground line, or other connection parts via this connection terminal body. It has become.

In order to simplify the assembly process of the ignition coil unit for an internal combustion engine, it is desirable that the conductor wire can be easily assembled to the connection terminal body. An ignition coil for an internal combustion engine has been proposed, which is provided with an expansion portion so that a conductor wire can be easily inserted into a slit of a connection terminal body, and has a coil terminal body in which an end face facing the slit is formed into a curved surface (for example). See Patent Document 1). According to the invention described in Patent Document 1, by forming the end face facing the slit into a curved surface, friction with the conductor wire is suppressed, the conductor wire is prevented from being scraped, and the conductor wire is relatively weak. Can be inserted into the slit of the connection terminal body.

JP-A-2017-005062

However, in the invention described in Patent Document 1, since the end face facing the slit into which the conductor wire is press-fitted is curved, the contact area between the conductor wire and the coil terminal body is reduced, and good electrical connection is achieved. I doubt if it can be retained. Further, if the contact area between the conductor wire and the coil terminal body is small, loosening due to aging is likely to occur, so that it cannot be said that the holding structure of the conductor wire is sufficient. Further, in the invention described in Patent Document 1, when connecting a coil coated with an insulating coating to a coil terminal body, the metal of the coil must be exposed in advance (Patent Document 1). (See page 6, lines 4 to 6), the work in advance is complicated. Of course, even if the conductor wire has no insulating film, it is desirable to remove the oxide film when an oxide film is formed on the surface by exposure to air for a long period of time.

Therefore, the present invention provides a connection terminal body that can be directly attached to a conductor wire having an insulating coating to realize a good electrical connection, a manufacturing method thereof, and a good connection state between the conductor wire and the connection terminal body. It is an object of the present invention to provide a method of attaching a conductor wire to a connection terminal body so that the conductor wire can be attached to the connection terminal body.

The connection terminal body for solving the above-mentioned problems is a connection terminal body that holds the conductor wire provided in the connection part electrically connected to other parts so as to be conductive, and is elastically conductive with a required thickness. It is a plate material, and is a fixing plate portion fixed at a required position and an elastic conductive plate material having a required thickness connected to one end of the fixing plate portion, and is fixed so that the tip is located on the fixing plate portion side. A connecting plate portion bent to a reference bending angle α which is less than 90 ° with respect to the plate portion is provided, and the connecting plate portion is formed on the tip end side of the connecting plate portion and is formed on the conductor wire rod from both sides. An introduction slit formed between a pair of connecting arms that can come into contact with each other and a linear void narrower than the conductor wire, and the introduction on the tip side of the pair of connecting arms. It is formed so as to face the slit from both sides, and occurs at the tip introduction region having a thickness thinner than the plate thickness of the connecting plate portion and the boundary returning from the thin thickness of the tip introduction region to the plate thickness of the connecting plate portion. It is characterized by providing a stepped edge portion.

Further, as a method for manufacturing a connection terminal body in which the connection terminal body having the above configuration is manufactured from a plate material having a required shape, the tip introduction region may be created by press-molding the tip appropriate position of the connection arm portion from one side.

Further, in the method of attaching the conductor wire to the connection terminal body having the above configuration, the pair of the conductor wires is attached toward the fixing plate portion so that the conductor wire intersects the introduction slit. The peripheral surface of the press-fitted conductor wire is cut by the pair of tip introduction regions provided in each of the pair of connection arms, and the conductor wire is stepped from the tip introduction region. By passing through the edge portion, the peripheral surface of the conductor wire rod is further cut, and the conductor wire rod having increased contact resistance with the pair of connecting arm portions is further pushed toward the fixing plate portion to obtain the reference. The connecting plate portion is bent to a recoverable angle β that is smaller than the bending angle α but does not exceed the elastic limit, and the pair of connecting arm portions are pressure-deformed so as to narrow the introduction slit, and the peripheral surface of the conductor wire is obtained. It is characterized in that the conductor wire is crimped so that a locking cross section that bulges toward each connection arm is formed, and the conductor wire is attached to the connection terminal body.

According to the connection terminal body according to the present invention, the surface of the conductor wire is cut by passing through the tip introduction region having a thickness thinner than the plate thickness of the connection plate portion, and further, the plate of the connection plate portion is cut from the tip introduction region. The surface of the conductor wire is further cut by passing through the stepped edge that occurs at the boundary that returns to the thickness. Therefore, even if the conductor wire has an insulating coating, good electrical connection with the connection terminal can be realized. Further, according to the method for manufacturing a connection terminal body according to the present invention, the density of the tip introduction region formed by compression by press working increases to increase the hardness, the introduction slit is locally narrowed, and the stepped edge portion is steep. It becomes a step. Therefore, it is possible to easily form a tip introduction region and a stepped edge portion suitable for cutting the surface of the conductor wire. Further, according to the method of attaching the conductor wire to the connection terminal body according to the present invention, the conductor wire is press-fitted into the introduction slit to bend the connection plate portion to a strain generation angle β that does not exceed the elastic limit, and the conductor wire is formed. The locking cross section is formed by caulking. Therefore, a stress is exerted on the connecting plate portion to return the strain generation angle β to the reference bending angle α, and an urging force is applied to the pair of connecting arm portions in the connecting plate portion against the locking cross section of the conductor wire. It is maintained and can maintain a good electrical connection between the connection terminal body and the conductor wire.

It is the external perspective view of the connection terminal body which omitted a part. It is a process explanatory drawing for forming a tip introduction region in a connection plate part. It is a process explanatory drawing for attaching a diode lead to a connection terminal body. (A) is an explanatory view of a state when a coated copper wire is press-fitted into the tip introduction region of the first and second connecting arms. (B) is an explanatory view of a state when the coated copper wire is crimped at the first and second connecting arms.

Next, an embodiment of the connection terminal body according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the appearance of the connection terminal body 100 in which a part is omitted, and an elastic conductive plate material having a required thickness is produced by shearing and pressing. The connection terminal body 100 electrically holds a conductor wire (for example, a diode lead or a coil tip) provided on a connection component (for example, a diode or a coil) that is electrically connected to another component. Is. As the conductor wire, there are a round wire having a substantially circular cross section, a square wire having a regular quadrangular cross section, and a flat wire having an oblong cross section. Further, the connection terminal body 100 is used by being fixed at a required position (for example, a connector connection portion of an ignition coil case for an internal combustion engine) capable of contacting a connection component.

As the plate material for manufacturing the connection terminal body 100, brass, phosphor bronze, iron-containing copper (KFC), pure copper and the like can be used. These materials are suitable for the connection terminal body 100 because they have good pressability and springback properties (the property of elastically recovering to the original state even if they are bent by pressure). Further, brass, phosphor bronze, iron-containing copper (KFC), pure copper, aluminum and the like are widely used as the conductor wire rod to be electrically connected to the connection terminal body 100.

The connection terminal body 100 includes at least a fixing plate portion 110 fixed at a required position and a connection plate portion 120 connected to one end of the fixing plate portion 110. A connection plate portion for attaching a connector terminal portion and other connection parts is provided on the other end side of the fixing plate portion 110 (not shown), and the connection parts and electricity attached via the connection plate portion 120 are provided. To connect. Further, the connecting plate portion 120 is bent at a reference bending angle α (for example, 80 ° <α <90 °) which is less than 90 ° with respect to the fixed plate portion 110 so that the tip is located on the fixed plate portion 110 side. I'm letting you.

A first connecting arm 121 and a second connecting arm 122 are provided on the tip end side of the connecting plate 120 as a pair of connecting arms, and are formed between the first and second connecting arms 121 and 122. The introduction slit 123 is a linear void narrower than the conductor wire to be attached. When the conductor wire is a round wire, the width of the introduction slit 123 is narrower than the diameter of the conductor wire, and when the conductor wire is a square wire, the width of the introduction slit 123 is narrower than one side of the conductor wire. When the conductor wire is a flat wire, the width of the introduction slit 123 may be narrower than the short side of the conductor wire. Hereinafter, a case where the round wire is used as a conductor wire will be described. Induction tapered surfaces 121b and 122b are provided so that the opening from the most advanced portions 121a and 122a of the first and second connecting arms 121 and 122 to the introduction slit 123 is gradually narrowed, and the conductor wire rod to be attached is introduced into the introduction slit 123. Make it easier to lead to.

Further, on the tip side of the first and second connection arm portions 121 and 122, a first tip introduction region 124a and a second tip introduction region 124b are formed so as to face the introduction slit 123 from both sides, respectively, and the connection plate portion 120 Make it thinner than the plate thickness of. The first and second tip introduction regions 124a and 124b may be provided over the entire width of the tips of the first and second connecting arms 121 and 122, but since there is a concern that the strength may decrease, in the present embodiment, It is provided only on the side facing the introduction slit 123. Further, as will be described later, if the first and second tip introduction regions 124a and 124b are provided so as to face the introduction slit 123, the function is sufficiently exhibited.

By providing the first and second tip introduction regions 124a and 124b as described above, the first and second connecting arm portions 121 and 122 are provided with narrow introduction surfaces 121c and 122c connected to the induction taper surfaces 121b and 122b. It is formed. At a location deeper than the formation range of the first and second tip introduction regions 124a and 124b (the location behind the introduction slit 123), the thickness of the connecting plate portion 120 is restored, so that the narrow introduction surfaces 121c and 122c are formed. A series of widening introduction surfaces 121d and 122d are formed.

Then, at the boundary where the thin thickness of the first and second tip introduction regions 124a and 124b returns to the normal plate thickness of the connecting plate portion 120 (the boundary where the narrow introduction surfaces 121c and 122c change to the wide introduction surfaces 121d and 122d). Is formed with a first step edge portion 125a and a second step edge portion 125b. The first and second step edge portions 125a and 125b are steps in a direction substantially orthogonal to the direction in which the conductor wire is press-fitted along the introduction slit 123, and it is desirable that the steps are steeper than the gentle steps.

As a method of forming the narrow first and second tip introduction regions 124a and 124b described above, one side of the tips of the first and second connecting arms 121 and 122 may be cut. However, if the method of manufacturing the connection terminal body 100 that forms the first and second tip introduction regions 124a and 124b by press working as shown in FIG. 2, suitable first and second tip introduction regions 124a and 124b and The first and second step edge portions 125a and 125b can be easily formed.

FIG. 2A shows a connection plate portion 120'in which the first and second tip introduction regions 124a and 124b are not formed is set on the press table 211. Since the first and second tip introduction regions 124a and 124b are not formed, the induction tapered surfaces 121b'and 122b'have the same thickness as the connection plate portion 120, and the introduction slit 123'has no narrow portion. .. The connection plate portion 120'is pressed by a press mold 212 on which convex portions 212a corresponding to the first and second tip introduction regions 124a and 124b are formed (see FIG. 2B).

Then, when the press mold 212 is returned (see FIG. 2C), the portions compressed by the convex portion 212a are formed as the first and second tip introduction regions 124a and 124b. The compression-formed first and second tip introduction regions 124a and 124b become denser and have higher hardness, and the narrow introduction surfaces 121c and 122c slightly bulge, resulting in a state in which the introduction slit 123 is locally narrowed. .. In addition, the first and second step edge portions 125a and 125b generated at the boundary between the narrow introduction surfaces 121c and 122c and the wide introduction surfaces 121d and 122d are steep steps.

FIG. 3 shows an example of a method of attaching the conductor wire to the connection terminal body 100 configured as described above. A diode 300 is used as a connecting component, and a lead 320 extending from the diode main body 310 is used as a conductor wire to be attached.

The lead 320 of the diode 300 is held by the lead end holding portion 221 on the free end side so as to be held linearly and without bending with respect to the diode main body 310, and is directed toward the connection plate portion 120 of the connection terminal body 100. A pressurizing portion 222 that pressurizes is set (see FIG. 3A). At this time, the lead 320 is held in a state substantially parallel to the fixed plate portion 110, and moves so as to approach the fixed plate portion 110 while maintaining this parallel state. The direction in which the lead 320 is pressed by the pressurizing portion 222 is not particularly limited, but in the present embodiment, the orientation is set to be substantially perpendicular to the fixing plate portion 110. In this way, the lead 320 can be introduced between the first connecting arm portion 121 and the second connecting arm portion 122 in a state where the lead 320 intersects the introduction slit 123 of the connecting plate portion 120.

Since the connecting plate portion 120 is bent so as to have a reference bending angle α of less than 90 ° with respect to the fixed plate portion 110, a force in the pressurizing direction by the pressurizing portion 222 is applied to the tip end side of the connecting plate portion 120. When acting, a rotational moment acts in a direction that makes the bending angle smaller than α. That is, when the lead 320 is press-fitted into the introduction slit 123 by the pressurizing portion 222, the tip end side of the connecting plate portion 120 bends so as to approach the fixed plate portion 110 (see, for example, FIG. 3B). ).

The angle at which the connecting plate portion 120 is bent is limited to a recoverable angle β that is smaller than the reference bending angle α but does not exceed the elastic limit. In the connecting plate portion 120 that is bent from the reference bending angle α to the recoverable angle β, the internal stress acts as a restoring force that tries to return to the state of the reference bending angle α, so that the pressurizing portion 222 that pressurizes through the lead 320. If the force of is lost, the connecting plate portion 120 returns to the state of the reference bending angle α. However, if this restoring force is used for the stable holding structure of the lead 320, it is possible to suppress the risk of poor continuity between the connecting plate portion 320 and the lead 320 due to aged deterioration or the like. The pressurizing portion 222 is provided with an empty portion 222a for receiving the tip side of the first and second connecting arm portions 121 and 122, and within the range of the empty portion 222a, the first and second connecting arm portions 121, The pressurizing portion 222 does not prevent the tip of 122 from being displaced and the connecting end portion 120 from bending to the recoverable angle β.

Here, the process in which the conductor wire passes through the introduction slit 123 of the connecting plate portion 120 will be described with reference to FIG. Here, the coated copper wire 330 used as the primary coil and the secondary coil of the ignition coil for the internal combustion engine is used as the conductor wire, and the surface thereof is coated with the insulating coating 331, which is electrically the peripheral surface of the coated copper wire 330 as it is. I can't connect. Further, the coated copper wire 330 has a diameter larger than the opening width of the introduction slit 123, but is reasonably press-fitted into the introduction slit 123 by the pressure of the pressurizing portion 222.

As shown in FIG. 4A, when the coated copper wire 330 passes through the first and second tip introduction regions 124a and 124b of the first and second connecting arms 121 and 122, the narrow introduction surfaces 121c and 122c The peripheral surface will be rubbed. Since the narrow introduction surfaces 121c and 122c are formed by press-molding the first and second tip introduction regions 124a and 124b, they slightly bulge toward the introduction slit 123 side and are strong with the coated copper wire 330. Rubbing and high cutting effect can be expected. Therefore, when the coated copper wire 330 passes through the first and second tip introduction regions 124a and 124b, the insulating coating 331 is scraped off, and conductive regions 332 are generated at two locations in contact with the narrow introduction surfaces 121c and 122c.

Further, the coated copper wire 330 crosses the first and second tip introduction regions 124a and 124b of the first and second connecting arms 121 and 122 and comes into contact with the widening introduction surfaces 121d and 122d from the narrow introduction surfaces 121c and 122c. When this happens, it passes through the first and second stepped edge portions 125a and 125b. The first and second stepped edge portions 125a and 125b have an edge shape substantially orthogonal to the press-fitting direction of the coated copper wire 330, and the intervals between the first and second stepped edge portions 125a and 125b are the coated copper wire 330. Since it is narrower than the diameter of the copper wire 330, the insulating coating 331 of the coated copper wire 330 can be efficiently scraped off. That is, as shown in FIG. 4B, the coated copper wire 330 press-fitted until it exceeds the first and second tip introduction regions 124a and 124b has the insulating coating 331 cut over a wider area, and the widening introduction surface 121d, A wider range of conductive regions 333 is formed at the two locations in contact with 122d.

In this way, when the coated copper wire 330 coated with the insulating coating 331 is attached to the connection terminal body 100, the insulating coating 331 is pressed into the introduction slit 123 even if the insulating coating 331 is not scraped off in advance. It will be scraped naturally and will be conductive. Therefore, if the connection terminal body 100 of the present embodiment is used, even if the conductor wire has an insulating coating, a good electrical connection can be realized simply by attaching the conductor wire as it is, so that the assembly process and the like can be simplified.

As described above, when the connecting plate portion 120 is bent to the recoverable angle β in a state where the coated copper wire 330 has a wide range of conductive regions 333, the mounting position is just reached. Here, the first connecting arm portion 121 and the second connecting arm portion 122 are pressure-deformed in a direction closer to each other (direction in which the introduction slit 123 is narrowed), and the first and second connecting arm portions 121 and 122 are coated with copper wire 330. Perform caulking to fix. In the crimped coated copper wire 330, the conductive region 333 is further recessed, and substantially arc-shaped locking cross-sectional portions 334a and 334b are formed at both ends thereof. The locking cross-sections 334a and 334b are substantially conductive regions without the insulating coating 331. In particular, the locking cross-sectional portion 334b on the side where the insulating coating 331 is scraped when passing through the first and second stepped edge portions 125a and 125b is likely to be formed as a good conductive region.

Further, the locking cross-sectional portions 334a and 334b are end faces of the recess formed on the peripheral surface of the coated copper wire 330, but are front and rear surfaces of the first connecting arm portion 121 or the second connecting arm portion 122 (temporarily, the first and first). The side forming the second tip introduction regions 124a and 124b is the front surface, and the opposite side is the rear surface). Therefore, the locking cross-sectional portions 334a and 334b of the coated copper wire 330 are in a state of being locked to the first connecting arm portion 121 or the second connecting arm portion 122, and the connection plate portion 120 can be restricted from moving in the front-rear direction. .. For example, as shown in FIG. 4B, when stress is generated in the connecting plate portion 120 in the S direction, the locking cross-sectional portion 33b regulates the restoring force of the connecting plate portion 120, and the connecting plate portion 120 is affected. When stress is generated in the S'direction, the locking cross-sectional portion 33a regulates the restoring force of the connecting plate portion 120. Moreover, since the locking cross-sectional portions 334a and 334b are conductive regions, suitable electrical connection between the coated copper wire 330 and the connecting plate portion 120 can be made regardless of whether the stress of the connecting plate portion 120 is in the S direction or the S'direction. realizable.

Then, as shown in FIG. 3C, when the lead end holding portion 323 and the pressurizing portion 222 are separated from the lead 320, the connecting plate portion 120 bent from the reference bending angle α to the recoverable angle β is referred to. The springback property (in the S direction in FIG. 3C) that tries to return to the state of the bending angle α works. However, as with the coated copper wire 330 described above, the lead 320 is crimped and the other lead of the diode 300 is also fixed to another terminal, so that the connecting plate 120 is on the locking cross section of the lead 320. It is regulated and cannot return to the reference bending angle α. Therefore, the springback property of the connection plate portion 120 bent to the recoverable angle β acts as an urging force for pressing the connection plate portion 120 against the locking cross section of the lead 320, and the connection plate portion 120 and the lead 320 A suitable electrical connection can be achieved. In addition, even if the lead 320 becomes loose due to aged deterioration or the like, tension acts due to the springback property of the connection plate portion 120, so that the connection state between the connection plate portion 120 and the lead 320 is stably maintained. To.

Although the embodiment of the connection terminal body and the method of attaching the conductor wire to the connection terminal body according to the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to these embodiments and claims for a patent. The present invention may be carried out by diverting known and existing equivalent technical means without changing the configuration described in the above.

100 Connection terminal body 110 Fixed plate part 120 Connection plate part 121 First connection arm part 122 Second connection arm part 123 Introduction slit 124a First tip introduction area 124b Second tip introduction area 125a First step edge part 125b Second step edge Part 300 Diode 320 Lead

Claims (3)

A connection terminal body that electrically holds a conductor wire provided in a connection component that is electrically connected to another component.
It is an elastic conductive plate material with the required thickness, and the fixing plate part fixed at the required position and
An elastic conductive plate material having a required thickness connected to one end of the fixing plate portion, and having a reference bending angle α of less than 90 ° with respect to the fixing plate portion so that the tip is located on the fixing plate portion side. The bent connection plate and
With
The connection plate
A pair of connecting arms formed on the tip side of the connecting plate portion and capable of contacting the conductor wire from both sides,
An introduction slit formed between the pair of connecting arms and a linear void narrower than the conductor wire,
A tip introduction region having a thickness thinner than the thickness of the connection plate portion, which is formed so as to face the introduction slit from both sides on the tip side of the pair of connection arm portions,
A stepped edge portion generated at a boundary where the thickness of the tip introduction region returns to the plate thickness of the connection plate portion,
A connection terminal body characterized by being provided with. A method for manufacturing a connection terminal body according to claim 1, wherein the connection terminal body is manufactured from a plate material having a required shape.
A method for manufacturing a connection terminal body, wherein the tip introduction region is created by press-molding an appropriate position at the tip of the connection arm from one side. The method for attaching a conductor wire to a connection terminal body according to claim 1, wherein the conductor wire is attached to the connection terminal body.
The conductor wire is press-fitted between the pair of connecting arms toward the fixing plate so that the conductor wire intersects the introduction slit.
The peripheral surface of the press-fitted conductor wire is cut by the pair of tip introduction regions provided on the pair of connecting arms.
By passing the conductor wire from the tip introduction region through the stepped edge portion, the peripheral surface of the conductor wire is further cut.
By further pushing the conductor wire rod having increased contact resistance with the pair of connecting arms toward the fixing plate portion, the connection is made up to a recoverable angle β that is smaller than the reference bending angle α but does not exceed the elastic limit. Bend the plate and
The pair of connecting arms are pressure-deformed so as to narrow the introduction slit, and the conductor wire is crimped so that a locking cross section that bulges toward each connecting arm is formed on the peripheral surface of the conductor wire. ,
A method for attaching a conductor wire to a connection terminal body, which comprises attaching the conductor wire to the connection terminal body.

Images