JP2021118156A - Crimp terminal and electronic apparatus - Google Patents

Abstract

To provide a crimp terminal which suppresses the outer periphery of a wire conductor from being scraped off when the coating of a coated wire is peeled off and the wire conductor is held in a conduction state.SOLUTION: When the coating 5b of a coated wire 5 is peeled off at a peeling part 13 to expose a wire conductor 5a to the outside, a notch is formed in the coating 5b of the coated wire 5 at a first peeling part 13a, and, starting from the notch, the coating 5b is peeled off at a second peeling part 13b so that the wire conductor 5a is exposed to the outside. Thus, the occurrence of a short circuit in an electrical circuit due to the falling of the coating 5b and the wire conductor 5a, as cutting powder, from the coated wire 5 can be prevented.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pressure welding terminal and an electronic device.

For example, Patent Document 1 describes a configuration in which the coating of a coated electric wire is peeled off by a pressure welding blade provided on the pressure welding terminal, and the wire conductor exposed to the outside is held in a conductive state.

Japanese Unexamined Patent Publication No. 2016-18699

However, in Patent Document 1, since the coating is peeled off by the pressure welding blade and at the same time pressure welding is performed, the outer periphery of the electric wire conductor is scraped off when the coating is peeled off. Therefore, the cross-sectional area of the electric wire conductor may decrease, the holding force of the coated electric wire by the pressure welding terminal may decrease, or the strength of the coated electric wire itself may decrease.
In addition, the scraped cutting powder may interfere with the operation of the electric circuit.

The present invention has been made in view of the above circumstances, and an object of the present invention is a pressure welding terminal capable of suppressing scraping of the outer periphery of the electric wire conductor when the coating of the coated electric wire is peeled off and the electric wire conductor is held in a conductive state. And to provide electronic devices.

According to the invention of claim 1, the introduction portion (12) inserts the coated electric wire (5) along the gap portion (11) as the coated electric wire (5) inserted in the gap portion (11) moves. Guide in the direction. Subsequently, the peeling portion (13) is in a state in which the coating (5b) is connected to the coated electric wire (5) as the coated electric wire (5) guided by the introduction portion (12) moves, and in the direction opposite to the insertion direction. It is peeled off to expose the electric wire conductor (5a) to the outside. Subsequently, the holding portion (14) holds the electric wire conductor (5a) exposed to the outside by the peeling portion (13) in a conductive state as the covered electric wire (5) moves.

Top view of the pressure welding terminal according to the embodiment Cross section of covered wire Side view showing the stator of the motor Perspective view of the connection The figure which shows the punching area by the pressing process of a pressure welding terminal Top view of a pressure welding terminal showing a covered electric wire moving in the first gap Top view of a pressure welding terminal showing a covered electric wire moving in a second gap Top view of a pressure welding terminal showing a covered electric wire moving in a third gap The figure which shows the dimensional relationship for lateral buckling of the 1st beam of a pressure welding terminal. The figure which shows the relationship between the cut distance of a covered electric wire, and the distance of a 4th gap part. Top view of a pressure welding terminal showing a covered electric wire entering the fourth gap Top view of a pressure welding terminal showing a covered electric wire moving in a fourth gap Top view of the first beam according to other embodiments (No. 1) Top view of the first beam according to other embodiments (Part 2)

Hereinafter, one embodiment will be described with reference to the drawings.
For example, the vehicle is equipped with various motors (not shown). These motors and the control board are electrically connected, and the motor operates in response to a drive signal from the control board. A pressure welding terminal is mounted on the control board and is connected to an electric circuit for driving. In order to electrically connect the motor and the control board, the motor windings are held in a conductive state by pressure welding terminals mounted on the control board. A motor corresponds to an electric circuit, and an electronic device is composed of a motor and a control board.

The motor includes the stator 1 shown in FIG. The stator 1 is formed by integrally molding an electromagnetic steel sheet 2 with an insulator 3. A bobbin 4 is integrally provided on the stator 1, and a motor winding is formed by winding a coated electric wire 5 around the bobbin 4 with a winding machine (not shown).

A connecting portion 6 is projected and molded on the upper surface of the insulator 3. As shown in FIG. 4, a hole 7 is formed on the upper surface of the connecting portion 6. A slit 8 having an opening at the upper side is formed on the wall surface located in front of and behind the hole 7, and a taper 8a for guiding the coated electric wire 5 is formed at a portion where the slit 8 opens. The end of the covered electric wire 5 is attached to the inner end of the slit 8 in a positioned state. As a result, the end portion of the covered electric wire 5 is suspended in a state of penetrating the hole portion 7 in the front-rear direction.

On the other hand, the legs of the pressure welding terminal 9 shown in FIG. 3 are fixed to the control board (not shown) by soldering. The pressure welding terminal 9 is formed of, for example, a flat plate member such as brass or phosphor bronze having a thickness of about 1 mm. The hole portion 7 formed in the connection portion 6 is formed to be slightly larger than the external dimensions of the pressure welding terminal 9, so that the pressure welding terminal 9 is inserted into the hole portion 7 of the connection portion 6 when the control board is assembled. It has become.

When the pressure welding terminal 9 is inserted into the hole 7 of the connecting portion 6, the end portion of the covered electric wire 5 suspended from the connecting portion 6 is held in a conductive state by the pressure welding terminal 9. As a result, the motor winding is electrically connected to the electric circuit mounted on the control board.
As shown in FIG. 1, the pressure welding terminal 9 has a pair of arm portions 10 facing each other, and a gap portion 11 having an open upper part in the drawing is formed between these arm portions 10. The covered electric wire 5 is inserted into the gap 11.

As shown in FIG. 2, the coated electric wire 5 inserted into the gap 11 of the pressure welding terminal 9 is formed by covering the outer periphery of the electric wire conductor 5a made of copper, for example, with an insulating coating 5b such as polyesterimide or polyamideimide. There is. The electric wire conductor 5a may be a single wire or a stranded wire.

In a state where the coated electric wire 5 is inserted into the gap portion 11 of the pressure welding terminal 9, the coated electric wire 5 is held in a conductive state by the arm portion 10 of the pressure welding terminal 9. In order for the coated electric wire 5 inserted into the gap portion 11 of the pressure welding terminal 9 to be held in a conductive state by the arm portion 10, the arm portion 10 cuts the coating 5b of the coated electric wire 5 and directly contacts the outer periphery of the electric wire conductor 5a. There is a need to. When the arm portion 10 cuts into the coating 5b of the coated electric wire 5 in this way, it is important that the coating 5b and the electric wire conductor 5a are scraped off by the arm portion 10 so that they do not fall as cutting powder.

Under these circumstances, in the present embodiment, the shape of the pressure welding terminal 9 is devised as follows.
That is, as shown in FIG. 1, in the gap portion 11 formed between the arm portions 10 of the pressure contact terminal 9, three regions of an introduction portion 12, a peeling portion 13, and a holding portion 14 are set.

(1) Introduction section 12
The introduction portion 12 is provided for the purpose of guiding the coated electric wire 5 to a target position, and has a function of correcting the position of the coated electric wire 5. The gap portion 11 corresponding to the introduction portion 12 is referred to as a first gap portion 11a. One end of the first gap portion 11a is open, and a taper 10a is formed on the arm portion 10 corresponding to the opening.

(2) Peeling part 13
The peeling portion 13 is provided for the purpose of exposing the electric wire conductor 5a, and has a function of peeling the coating 5b of the coated electric wire 5. The peeling portion 13 is provided with a first peeling portion 13a and a second peeling portion 13b in order along the insertion direction of the coated electric wire 5.

(2-1) First peeling portion 13a
The first peeling portion 13a is provided to form a notch in the coating 5b in a direction orthogonal to the insertion direction of the coated electric wire 5. The gap portion 11 corresponding to the first peeling portion 13a is referred to as the second gap portion 11b. A first lateral groove portion 15 and a second lateral groove portion 16 are provided in a direction orthogonal to the second gap portion 11b. A pair of long first beams 17 facing each other are integrally formed on the arm portion 10 by the second gap portion 11b, the first lateral groove portion 15, and the second lateral groove portion 16. The tip corner portion of the first beam 17 located above the drawing is formed in an edge shape. Hereinafter, the tip corner portion of the first beam 17 located above the drawing is referred to as a blade portion.

The blade portion 17a of the first beam 17 functions so as to sharply bite into the coating 5b as the coated electric wire 5 moves through the second gap portion 11b. Further, the base end portion of the first beam 17 functions to be laterally buckled and plastically deformed by a moment accompanying a pressing force from the coated electric wire 5.

Here, when the base end portion of the first beam 17 does not laterally buckle due to the moment due to the pressing force from the coated electric wire 5, the base end portion of the first beam 17 does not undergo plastic deformation, so that the blade of the first beam 17 does not deform. There is a possibility that the coating 5b of the coated electric wire 5 and the outer periphery of the electric wire conductor 5a are sheared by the portion 17a to generate cutting chips. Therefore, the first beam 17 is formed in a long shape that is cantilevered and supported by the arm portion 10 so as to be plastically deformed at the base end portion by a moment accompanying a pressing force from the coated electric wire 5.

(2-2) Second peeling portion 13b
The second peeling portion 13b is provided to peel the coating 5b from the wire conductor 5a from the notch formed in the coating 5b of the coated electric wire 5. The gap portion 11 corresponding to the second peeling portion 13b is referred to as the third gap portion 11c. A pair of flat plate-shaped second beams 18 that are cantilevered and opposed to the arm portion 10 are integrally formed by the third gap portion 11c and the second lateral groove portion 16. The tip corner portion of the second beam 18 located above the drawing is formed in a curved shape. Hereinafter, the tip corner portion of the second beam 18 located above the drawing is referred to as a curved portion.

The reason why the curved portion is formed on the second beam 18 in this way is that when the tip corner portion has an edge shape, the tip angle of the second beam 18 is formed when the covered electric wire 5 is inserted into the third gap portion 11c. This is because the outer periphery of the covered electric wire 5 may be scraped by the portion and the cutting powder may fall.

(3) Holding part 14
The sandwiching portion 14 is provided for the purpose of holding the covered electric wire 5 and securing a conduction path, and has a function of sandwiching the exposed electric wire conductor 5a between the arm portions 10. The gap portion 11 corresponding to the sandwiching portion 14 is referred to as the fourth gap portion 11d. The distance of the fourth gap portion 11d coincides with the minimum distance of the third gap portion 11c.

Here, as shown in FIG. 1, the maximum distance of the first gap portion 11a is W1, the minimum distance is W2, the distance of the second gap portion 11b is W3, and the minimum distance of the third gap portion 11c is W4, which is shown in FIG. Assuming that the diameter of the covered electric wire 5 is d0, the relationship of W1> W2 ≧ d0> W3> W4 is set to be satisfied.

Next, a method of forming the first beam 17 will be described. A region corresponding to the entire gap portion 11 including the second lateral groove portion 16 shown by the left diagonal line in FIG. 5 is punched by the first pressing step. After that, the region corresponding to the first lateral groove portion 15 indicated by the right diagonal line is punched by the second pressing step. As a result, a pair of long first beams 17 facing the arm 10 are integrally formed on the arm 10, and at the same time, an R0 edge-shaped blade 17a is formed on the first beam 17. In this way, the first and second pressing steps are executed in order when the entire gap portion 11 including the first lateral groove portion 15 in addition to the second lateral groove portion 16 is punched by one pressing step. This is because the edge shape of R0 cannot be formed at the tip corner portion of the first beam 17, and the shape has a slight R, and the edge-shaped blade portion cannot be formed.
By executing the first and second pressing steps in order as described above, the edge-shaped blade portion 17a can be formed on the first beam 17.

Now, when the control board is assembled, the pressure welding terminal 9 is inserted into the connection portion 6. Then, as shown in FIG. 6, the coated electric wire 5 is inserted into the gap portion 11 of the pressure welding terminal 9, so that the coated electric wire 5 moves in the first gap portion 11a. At this time, the covered electric wire 5 is guided so as to move in the center of the first gap portion 11a by the taper 10a formed on the arm portion 10.

Further, when the covered electric wire 5 moves in the first gap portion 11a, it enters the second gap portion 11b as shown in FIG. 7, and the outer circumference of the coated electric wire 5 comes into contact with the blade portion 17a of the first beam 17. In this case, since the blade portion 17a of the first beam 17 has an edge shape of R0, a notch is formed on the surface of the coating 5b of the coated electric wire 5 in a direction orthogonal to the insertion direction of the coated electric wire 5.
Further, when the covered electric wire 5 moves through the second gap portion 11b, the blade portion 17a of the first beam 17 penetrates the covering 5b of the coated electric wire 5 and comes into contact with the electric wire conductor 5a. As a result, the covered electric wire 5 is formed with a notch that penetrates the coated electric wire 5b and reaches the electric wire conductor 5a.

Further, when the covered electric wire 5 moves through the second gap portion 11b, the blade portion 17a of the first beam 17 is strongly pressed by the electric wire conductor 5a of the coated electric wire 5 in the insertion direction, so that the blade portion 17a of the first beam 17 is covered. It will bite into the electric wire 5 strongly. At this time, since the first beam 17 has a long shape that is cantilevered and supported by the arm portion 10, the largest force acts on the base end portion of the first beam 17 due to the moment associated with the pressing force from the coated electric wire 5. do. As a result, as shown in FIG. 8, the base end portion of the first beam 17 is laterally buckled before the blade portion 17a of the first beam 17 bites into the covered electric wire 5 significantly, so that the first beam 17 is the base end portion. It is plastically deformed so as to expand in the insertion direction around the center.

Here, when the first beam 17 laterally buckles at the base end portion as shown in FIG. 9, the dimension obtained by adding the height of the first beam 17 and the distance between the first beam 17 and the sandwiching portion 14 is calculated. It is set to be larger than the distance in the direction along the insertion direction. That is, assuming that the thickness of the first beam 17 is t1, the distance between the first beam 17 and the sandwiching portion 14 is t2, the distance between the portions where the first beam 17 laterally buckles is W5, and the width of the second gap is W3. , T1 + t2> ((W5-W3) / 2) · It is set so as to satisfy the relationship of tanθ.

The reason for setting in this way is that when the first beam 17 is plastically deformed and expanded around the base end portion due to the moment accompanying the pressing force of the coated electric wire 5, the tip of the first beam 17 moves the coated electric wire 5. This is to prevent the covered electric wire 5 from being located on the locus and hindering the movement of the covered electric wire 5.

Further, when the covered electric wire 5 moves in the second gap portion 11b, it enters the third gap portion 11c and comes into contact with the curved portion of the second beam 18 as shown in FIG.
Here, assuming that the maximum distance of the third gap 11c of the second peeling portion 13b is W6 and the distance between the cuts of the covered electric wire 5 is W7 as shown in FIG. 10, the relationship of W6> W7 is satisfied. It is set. This is because, as shown in FIG. 11, the notch of the covered electric wire 5 is brought into contact with the curved portion of the second beam 18.

Further, when the covered electric wire 5 moves through the third gap portion 11c, the coated electric wire 5 enters the fourth gap portion 11d. At this time, since the coating 5b is peeled off from the electric wire conductor 5a so as to be turned up from the notch by the curved portion of the second beam 18, the coating 5b is peeled off in a state of being connected to the coated electric wire 5. As a result, the electric wire conductor 5a is exposed to the outside.

Further, when the coated electric wire 5 moves through the fourth gap 11d, the coated electric wire 5 is gradually deformed into an elliptical shape while being peeled off from the coated electric wire 5 in a state where the coating 5b is connected to the coated electric wire 5.
Further, when the coated electric wire 5 moves through the fourth gap portion 11d, as shown in FIG. 12, the portion of the electric wire conductor 5a of the coated electric wire 5 that is deformed into an elliptical shape is strongly sandwiched by the sandwiching portion 14, so that the coated electric wire is firmly sandwiched. 5 is electrically and mechanically held by the pressure welding terminal 9.
As described above, the pressure welding terminal 9 is attached to the connection portion 6, and in the attached state, the coated electric wire 5 is electrically and mechanically held by the pressure welding terminal 9.

According to such an embodiment, the following effects can be obtained.
When the coating 5b of the coated electric wire 5 is peeled off by the peeling portion 13 to expose the electric wire conductor 5a to the outside, the first peeling portion 13a forms a notch in the coating 5b of the coated electric wire 5, and then the second peeling portion 13b. Since the coating 5b is peeled off while being connected to the coated electric wire 5 starting from the notch, it is possible to prevent the coating 5b and the electric wire conductor 5a from falling from the coated electric wire 5 as cutting dust and short-circuiting the electric circuit. can.

Further, since the cross-sectional area of the electric wire conductor 5a does not decrease when the coating 5b of the coated electric wire 5 is peeled off, the coated electric wire 5 can be firmly held by the sandwiching portion 14.
Since the region corresponding to the gap portion 11 is punched out by the first pressing step and then the region corresponding to the first lateral groove portion 15 is punched out by the second pressing step, the tip corner portion of the first beam 17 has an edge shape. The blade portion 17a can be formed.

(Other embodiments)
As for the shape of the first beam 17, the height dimension may be gradually increased toward the base end portion as shown in FIG. 13, or a recess 17b is formed in the base end portion as shown in FIG. You may do so. Further, the shapes of FIGS. 13 and 14 may be combined.
The coated electric wire 5 may be inserted into the positioned pressure welding terminal 9.
A flexible one may be adopted as the covered electric wire 5.
The connection is not limited to the connection between the motor and the control board, and may be applied to the connection between various actuators and the control board.

Although the present disclosure has been described in accordance with embodiments, it is understood that the present disclosure is not limited to such embodiments or structures. The present disclosure also includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms that include only one element, more, or less, are also within the scope of the present disclosure.

In the drawing, 5 is a coated electric wire, 9 is a pressure welding terminal, 10 is an arm portion, 5a is an electric wire conductor, 5b is a coating, 12 is an introduction portion, 13 is a peeling portion, 13a is a first peeling portion, and 13b is a second peeling portion. , 14 is a sandwiching portion, 15 is a first lateral groove portion (horizontal groove portion), 17 is a first beam, and 18 is a second beam.

Claims (9)

A pressure welding terminal (9) for holding a coated electric wire (5) whose surface of the electric wire conductor (5a) is covered with an insulator coating (5b) in a conductive state.
A pair of arms (10) forming a gap (11) into which the covered electric wire is inserted,
An introduction portion (12) that guides the coated electric wire in the insertion direction along the gap portion as the coated electric wire inserted into the gap portion moves.
With the peeling portion (13) in which the coating is connected to the coated wire and peeled in the direction opposite to the insertion direction to expose the wire conductor to the outside as the covered electric wire is moved guided by the introduction portion. ,
A holding portion (14) that holds the electric wire conductor exposed to the outside by the peeling portion in a conductive state as the covered electric wire moves.
Insulation terminal with. The peeled part is
A first peeling portion (13a) that forms a notch in a direction orthogonal to the insertion direction with respect to the coating as the coated electric wire moves.
The pressure welding terminal according to claim 1, further comprising a second peeling portion (13b) for peeling the coating in a state of being connected to the coated electric wire in a direction opposite to the insertion direction starting from the notch. The first peeling portion has a pair of first beams (17) facing each other by being cantilevered and supported by the arm portion, and the coated electric wire fills the gap formed between the first beams. Along with the movement, the tip corner portion of the first beam forms the notch in the coating in a direction orthogonal to the insertion direction.
The second peeling portion has a pair of second beams (18) facing each other by being cantilevered and supported by the arm portion, and the coated electric wire fills the gap formed between the second beams. The pressure welding terminal according to claim 2, wherein as the second beam moves, the coating is peeled off in a state of being connected to the coated electric wire in a direction opposite to the insertion direction starting from the notch. The tip corner portion of the first beam to which the covered electric wire abuts is formed in the edge shape of R0.
The pressure welding terminal according to claim 3, wherein the tip corner portion of the second beam to which the covered electric wire abuts is formed in a curved shape having an R. The pressure welding terminal according to claim 3 or 4, wherein the first beam is formed into a long shape that can be plastically deformed by lateral buckling of a connection portion with the arm portion as the covered electric wire moves. The gap is formed by punching in the first pressing step.
The pressure welding according to any one of claims 3 to 5, wherein the tip corner portion of the first beam is formed by punching a lateral groove portion (15) orthogonal to the gap portion by a second pressing step. Terminal. The dimension obtained by adding the width of the first beam in the insertion direction and the distance between the first beam and the second peeling portion in the insertion direction is the insertion when the first beam is maximally plastically deformed. The pressure welding terminal according to any one of claims 3 to 6, which is set to be larger than the dimension in the direction along the direction. The diameter of the covered electric wire is d0, the distance of the gap corresponding to the introduction portion is W2, the distance of the gap corresponding to the first beam is W3, and the distance corresponding to the second beam is the gap. When the distance of the part is W4,
The pressure welding terminal according to any one of claims 3 to 7, which satisfies the relationship of W2 ≧ d0>W3> W4. The pressure welding terminal according to any one of claims 1 to 8 connected to an electric circuit, and
A covered electric wire that is connected to an electric circuit and whose surface of the electric wire conductor is covered with a coating made of an insulator.
Electronic device equipped with.

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