JP2002270986A - Holding structure for terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding structure for a terminal which can relieve mechanical stress and thermal stress acting on a soldering part, and can securely prevent the occurrence of a solder crack. SOLUTION: In the holding structure of the terminals 25, soldering parts 25a of the terminals 25 are inserted into the connection holes 21a of a board 21, and land parts 22 of the board 21 and the soldering parts 25a of the terminals 25 are kept by soldering in a state where the terminals 25 are erected. A terminal plate 30 guiding the soldering parts 25a of the terminals 25 to connection holes 21a of the substrate 21 is arranged in a position confronted with the board 21 by leaving a prescribed clearance. Positioning holes 34a holding midway parts 25b of the terminals 25 are arranged in the terminal plate 30 and restraint parts 25c restrained into the positioning holes 34a of the terminal plate 30 are disposed in the midway parts 25b of the terminals 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal holding structure in which, for example, straight terminals are mounted on a printed circuit board used in an electronic control unit (ECU) by soldering.

[0002]

2. Description of the Related Art As a retaining structure of this type of terminal, FIG. 20
And Japanese Unexamined Patent Application Publication No. 2000-68622. As shown in FIGS. 20 (a) and 20 (b), this holding structure includes a pair of upper and lower members which protrude laterally from the base of the plate-shaped and straight terminal 1 at an interval corresponding to the thickness of the printed circuit board 5. Protrusions 2 and 3 are provided.

Then, the lower convex portion 3 of the terminal 1 is inserted through a pair of semicircular cuts 6a, 6a which are diametrically opposed to the mounting hole 6 of the printed circuit board 5, and is inserted into the terminal 1.
Is rotated by a predetermined angle, so that the pair of convex portions 2, 3
Is engaged with the peripheral edge of the mounting hole 6. With the printed circuit board 5 sandwiched between the pair of convex portions 2 and 3 of the terminal 1, the terminal 1 is soldered to the land 7 formed around the mounting hole 6 of the printed circuit board 5. It is mounted on the printed circuit board 5 in a vertically upright state. This soldered portion (solder fillet) is indicated by reference numeral 8.

[0004]

However, in the conventional structure for holding the terminal 1 on the printed circuit board 5, the soldering is carried out so as to completely cover the pair of projections 2 and 3 of the terminal 1 holding the printed circuit board 5. (Ie, the distance between the pair of convex portions 2 and 3 of the terminal 1 and the soldering portion 8 is very small). A large mechanical stress is directly applied to the soldering portion 8 from above and below via the pair of convex portions 2 and 3 of the terminal 1, so that solder cracks (solder cracks) easily occur in the soldering portion 8 and the surrounding environment. A large thermal stress (thermal stress) is directly applied to the soldered portion 8 through the pair of convex portions 2 and 3 of the terminal 1 due to heat or heat such as self-heating of electronic components such as a fuse and a relay connected to the terminal 1. , Soldering part 8
Solder cracks were likely to occur. Further, since the land 7 of the printed board 5 is sandwiched between the pair of projections 2 and 3 of the terminal 1, the land 7 is easily damaged by the pair of projections 2 and 3 of the terminal 1.

Accordingly, the present invention has been made to solve the above-mentioned problems, and can alleviate the mechanical stress and the thermal stress acting on the soldered portion, thereby reliably preventing the occurrence of solder cracks. It is an object of the present invention to provide a terminal holding structure that can prevent the occurrence of a terminal.

[0006]

According to a first aspect of the present invention, a terminal soldering portion is inserted into a connection hole of a substrate, and the terminal is soldered to a land portion of the substrate with the terminal standing up. A terminal plate for guiding the soldered portion of the terminal to a connection hole of the substrate at a position facing the substrate with a predetermined clearance therebetween in a terminal holding structure in which the terminal plate is held by soldering. , While the terminal plate is provided with a positioning hole for holding an intermediate portion of the terminal,
A locking portion is provided in a middle portion of the terminal to be locked in a positioning hole of the terminal plate.

In this terminal holding structure, a locking portion provided at an intermediate portion of the terminal is locked in a positioning hole of a terminal plate arranged at a position facing the substrate with a predetermined clearance therebetween. Therefore, when the electric component is attached to or detached from the terminal, the mechanical stress acting on the soldered portion between the soldered portion of the terminal and the land of the substrate is reduced. Further, since the locking portion of the terminal locked in the positioning hole of the terminal plate is separated from the soldered portion, thermal stress acting on the soldered portion is reduced. Further, since the locking portion of the terminal is separated from the land portion of the substrate, the land portion is not damaged by the locking portion of the terminal. Thus, the occurrence of solder cracks in the soldered portion is reliably prevented.

According to a second aspect of the present invention, there is provided the terminal holding structure according to the first aspect, wherein a positioning hole of the terminal plate is provided in a terminal press-fitting portion protruding above the terminal plate.

In this terminal holding structure, the positioning hole of the terminal plate in which the locking portion of the terminal is locked is provided in the terminal press-fitting portion protruding above the terminal plate. The distance to the portion is sufficiently ensured, and stresses such as mechanical stress and thermal stress acting on the soldered portion are reduced. Further, heat due to ambient environmental heat and self-heating of the electronic components connected to the terminal is radiated to the terminal plate side from the locking portion of the terminal, so that the heat radiation effect is improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded front view showing an electric junction box integrated with an electronic control unit according to an embodiment of the present invention, FIG. 2 is a front view of the electric junction box, and FIG. 3 is a plan view of the electric junction box. 4 is a plan view of an electronic control unit built in the electric junction box,
FIG. 5 is a front view of the electronic control unit, and FIG.
7 is a cross-sectional view taken along line AA in FIG. 4, FIG. 8 is an enlarged plan view of a portion E in FIG. 6, and FIG.
10 is a sectional view taken along line BB in FIG. 4, FIG. 11 is an enlarged plan view of a portion F in FIG. 6, and FIG. 12 is a sectional view taken along line JJ in FIG. FIG. 13 shows KK in FIG.
14 is an explanatory view of a land portion used in the electronic control unit, FIG. 15 is a perspective view showing a relationship between the land portion and terminals, FIG. 16 is an enlarged plan view of a portion G in FIG. 6,
17 is a sectional view taken along the line PP in FIG. 16, and FIG.
19 is a right side view of the electronic control unit.

As shown in FIGS. 1 to 3, an electric connection box 10 integrated with an electronic control unit is provided with a box-shaped upper case 11 made of synthetic resin, and is fitted to the upper case 11 so as to be able to be locked and detached. Box-shaped main cover 12 made of synthetic resin
A busbar layer 13 disposed on the upper surface side of the main cover 12 and an electronic control unit (ECU) 20 built in between the upper case 11 and the main cover 12 below the busbar layer 13. It is roughly configured. The electric connection box 10 is mainly used for, for example, power distribution of an automobile, and the electronic control unit 20 controls on / off of, for example, an engine, a light, a wiper, and the like of the automobile.

As shown in FIG. 1, a bus bar layer 13 has a plurality of bus bars 15 arranged on an insulating substrate 14, and one end of each bus bar layer 13 is bent upward to form a slit-shaped press contact portion 15a or the like. ing. Each busbar 15
The pressure contact portions 15a extend to the relay mounting portion 12a and the fuse mounting portion 12b which are integrally formed on the upper surface side of the main cover 12 shown in FIG. The relay mounting portion 12a has a plug-in relay 16 as an electronic component.
However, a fuse 17 as an electronic component is mounted on the fuse mounting portion 12b.

As shown in FIGS. 1, 4, 5, 10, and 19, the electronic control unit 20 includes straight and crank-shaped terminals 25 and 26 and a resistor 27 as an electronic component.
And a main board (substrate) 21 made of a synthetic resin and mounted with a relay 28 and the like, respectively, and screws 39 so as to face the main board 21 via a plurality of cylindrical bosses 31 with a predetermined clearance therebetween. A substantially plate-shaped terminal plate (heat insulation plate) 30 made of synthetic resin and fixed to the lower surface side of the terminal plate 30 with a plurality of projections 41 such as a plurality of hooks fitted into the plurality of recesses 32 of the terminal plate 30. A plate-shaped plate cover 40 made of synthetic resin and disposed above and opposed to a part of the terminal plate 30 (excluding the area of the frame-shaped holding plate 33) with a predetermined clearance therebetween. Are stacked and held at a predetermined distance from the main board 21 via the holding plate 33 of the terminal plate 30;
And a plurality of control components 51 and 5 such as a microcomputer (CPU).
2 and the jumper wire 5
3 and a rectangular control board 50 connected via terminals (not shown).

As shown in FIG. 6 to FIG.
At the time of assembling with the terminal plate 30, the soldering portion 25 a at the lower end of the straight rod-shaped terminal 25 is guided by the terminal plate 30 into the connection hole 21 a of the main board 21. That is, when assembling the main board 21 and the terminal plate 30, the connection of the main board 21 hole 21
a and a terminal plate 3 holding the intermediate portion 25b of the terminal 25
0, the positions of the positioning holes 34a coincide with each other.
Of the terminal 25 in the connection hole 21a of the main board 21 at a position facing the main board 21 with a predetermined clearance therebetween.
5a is guided and inserted.

The soldered portion 25a of the terminal 25 inserted into the connection hole 21a of the main board 21 is
5 is soldered to a land 22 formed on the lower surface of the main board 21 in a state where the main board 5 is vertically erected.
1 is maintained. This soldered portion (solder fillet) is indicated by the symbol H.

Further, a projecting portion (locking portion) 25c locked in the positioning hole 34a of the terminal plate 30 is formed integrally with the intermediate portion 25b of the terminal 25 so as to protrude annularly. Further, the positioning holes 34 of the terminal plate 30
A is provided in two rows at the center of the terminal press-fitting portion 34 projecting in a block shape on the upper surface side of the terminal plate 30. The terminal press-fit portion 34 protrudes upward from the opening 42 of the plate cover 40, and the terminal press-fit portion 34
The upper end 25d of the more exposed terminal 25 is the main cover 12
Of the connector mounting portion 12c. This terminal 2
5 has an external connector 18 as an electric component
Are fitted.

The protrusion 25c of the terminal 25 is locked at a predetermined position in the positioning hole 34a of the terminal plate 30 by press-fitting, and this locked state is not sufficiently separated even by mechanical stress due to attachment and detachment of the external connector 18. It has become.

As shown in FIGS. 4 and 10 to 13, the large current terminal 26 which is cranked in an L-shape and which is wide as a whole has an upper end (one end) formed as a press contact portion 26a having a slit blade shape. Heating components such as a plug-in relay 16 and a fuse 17 and an external connector 18 are freely connectable. A pair of forked soldering portions 26b, 26b on the lower end (the other end) side of the terminal 26 are vertically inserted into the connection holes 21b of the main board 21 so as to be inserted into the lower surface of the main board 21. The main board 21 is held by soldering to the formed land portion 23. This soldered portion (solder fillet) is indicated by the symbol H.

As shown in FIG. 11, a wide flat portion 26d is formed in the middle portion 26c of the terminal 26 so as to be parallel to the main substrate 21. The flat portion 26d is The terminal plate 30 can be freely contacted with the terminal pressing portion 35 of the terminal plate 30 disposed at a position facing the terminal plate 21 with a predetermined clearance therebetween. Terminal 2
The wide flat portion 26d of 6 is capable of abutting on a terminal pressing portion 43 provided on a resin plate cover 40 covering the terminal plate 30 with a predetermined clearance from the terminal plate 30. That is, the terminal holding portions 35 of the terminal plate 30 and the terminal holding portions 4 of the plate cover 40 are provided.
3, the wide flat portion 26d of the terminal 26 is clamped.

The terminal plate 30 and the plate cover 4
In the vicinity of the terminal holding portions 35 and 43, the terminal insertion holes 3 are provided.
6, 44 are formed respectively. The press contact portion 26a of the terminal 26 exposed from the terminal insertion hole 44 of the plate cover 40 projects to the relay mounting portion 12a, the fuse mounting portion 12b, the connector mounting portion 12c and the like of the main cover 12. Further, as shown by oblique lines in FIG. 11, the terminal pressing portion 43 of the plate cover 40 is formed to have a width substantially the same as that of the wide flat portion 26d of the terminal 26. FIG.
As shown in FIG. 5, the terminal holding portion 35 of the terminal plate 30 is also formed wide similarly.

Further, as shown in FIGS. 13 and 15, the soldered portions 26b, 26b at the lower end of the terminal 26 which is cranked in an L-shape are divided into two and subdivided. Further, a pair of soldering portions 26 of the terminals 26 of the main board 21 are provided.
b, 26b, a pair of connection holes 21b, 2
1b are formed. Further, FIGS.
As shown in FIG. 5, a pair of round terminal insertion holes 23a, 23a are formed at positions of the terminals 26 of the land portion 23 facing the pair of soldering portions 26b, 26b, respectively. A pair of constrictions 23b, 2 around the land 23 between the pair of terminal insertion holes 23a, 23a of the land 23.
3b is formed.

As shown in FIGS. 6, 10, 16, and 17, at a predetermined position of the terminal plate 30, a component accommodating portion 37 for accommodating and holding the resistor (heating component) 27 is formed in a concave shape. . The concave component housing portion 37 and the main board 2
1 has a pair of insertion holes 37 for inserting a pair of lead portions 27b, 27b protruding from the component body 27a of the resistor 27.
a, 37a and 21c, 21c are formed respectively.

Then, each lead 27b of the resistor 27 is inserted into each of the concave component accommodating portion 37 and each of the insertion holes 37a and 21c of the main board 21 so that the resistance 27 is inserted into the bottom surface 37b of the concave component accommodating portion 37. Each of the lead portions 27b and the land portion 24 formed on the lower surface side of the main board 21 are held by soldering in a state where the component main body 27a is separated. This soldered portion (solder fillet) is indicated by the symbol H. In addition, the component housing 37 of the plate cover 40
An opening 45 having the same shape as the size of the component accommodating portion 37 is formed at a position opposed to.

As shown in FIG. 5 to FIG. 7, FIG. 18, and FIG. 19, heat generating components such as a resistor 27 and a relay 28 are mounted via a frame-shaped holding plate 33 integrally formed on the right side of the terminal plate 30. The main board 21 and the control board 50 on which the control components 51 and 52 such as a microcomputer (CPU) are mounted are held and laminated at a predetermined distance. That is, on the ceiling side of the holding plate 33, a heat blocking plate 38 is provided with a pair of side wall portions 33 of the holding plate 33.
a, 33a are integrally formed at the upper end. This heat shield plate 3
An air layer S is formed between the heat shield plate 38 and the control board 50 via a plurality of convex portions 38a integrally formed on the upper surface of the substrate 8.

The control board 50 is formed integrally with each of the pair of side walls 33a, 33a of the holding plate 33 and the heat shield plate 38, and has a hook-like shape which is engaged with the plurality of recesses 54 of the control board 50. It is positioned via each hook 33b. The air layer S between the heat insulating plate 38 and the control board 50 is always maintained at a constant value via the convex portion 38a of the heat insulating plate 38.

According to the electronic control unit-integrated electric junction box 10 of the embodiment described above, as shown in FIG. 9, the positioning holes of the terminal plate 30 arranged at a position facing the main board 21 with a predetermined clearance therebetween. Since the projection 25c formed integrally with the intermediate portion 25b of the straight and rod-shaped terminal 25 in 34a is fixed by press-fitting, when the external connector 18 is attached to or detached from the terminal 25, the terminal 25 is soldered. Part 25a and land part 2 of main board 21
2 can reduce the mechanical stress acting on the soldered portion H. The positioning holes 3 of the terminal plate 30
Projection 25c serving as a fixed point of terminal 25 locked in 4a
Is separated from the soldering portion H, the thermal stress acting on the soldering portion H can be reduced. Furthermore, terminal 2
5 and the land 22 of the main board 21 are separated from each other without approaching each other as in the related art.
The land portion 22 of the main board 21 is not damaged by the projection 25c. Thus, it is possible to reliably prevent the occurrence of solder cracks in the soldered portion H.

In particular, as shown in FIG. 9, the positioning holes 34 of the terminal plate 30 in which the projections 25c of the terminals 25 are locked.
a is formed in the terminal press-fitting portion 34 protruding to the upper surface side of the terminal plate 30, so that the distance (play) L from the convex portion 25c of the terminal 25 to the soldering portion H can be sufficiently secured, and soldering can be performed. Stress such as mechanical stress and thermal stress acting on the portion H can be reliably reduced. In addition, heat such as self-heating of a heat-generating component such as a relay 28 connected to the terminal 26 near the terminal 25 and surrounding environmental heat including engine heat,
The heat can be reliably dissipated from the projecting portion 25c of the terminal 25 to the terminal plate 30 made of synthetic resin as a heat shielding plate, and the heat dissipating effect can be further improved.

According to the above-described embodiment, the electronic control unit-integrated electric connection box incorporating the electronic control unit has been described. However, the electronic connection unit separate from the electric connection box and the electric connection unit not incorporating the electronic control unit are described. Needless to say, the embodiment can be applied to a box or the like.

[0030]

As described above, according to the first aspect of the present invention, the terminal is provided in the terminal hole in the positioning hole of the terminal plate arranged at a position facing the substrate with a predetermined clearance therebetween. Since the locking part is locked,
When an electric component is attached to or detached from a terminal, mechanical stress acting on a soldered portion between a soldered portion of the terminal and a land portion of the substrate can be reduced. Further, since the locking portion of the terminal locked in the positioning hole of the terminal plate is separated from the soldered portion, the thermal stress acting on the soldered portion can be reduced. Furthermore, since the locking portion of the terminal is separated from the land portion of the substrate, the land portion of the substrate is not damaged by the locking portion of the terminal. As a result, the occurrence of solder cracks at the soldered portion can be reliably prevented.

According to the second aspect of the present invention, since the positioning hole of the terminal plate in which the locking portion of the terminal is locked is provided in the terminal press-fitting portion protruding above the terminal plate, the locking portion of the terminal is provided. And the distance to the soldering portion can be sufficiently secured, and stresses such as mechanical stress and thermal stress acting on the soldering portion can be reduced. Further, heat such as ambient environmental heat and self-heating of electronic components connected to the terminal can be reliably radiated to the terminal plate from the locking portion of the terminal, and the heat radiation effect can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded front view showing an electric control box integrated with an electronic control unit according to an embodiment of the present invention.

FIG. 2 is a front view of the electric junction box.

FIG. 3 is a plan view of the electric junction box.

FIG. 4 is a plan view of an electronic control unit built in the electric connection box.

FIG. 5 is a front view of the electronic control unit.

FIG. 6 is a sectional view taken along line DD in FIG. 5;

FIG. 7 is a sectional view taken along line AA in FIG.

FIG. 8 is an enlarged plan view of a portion E in FIG. 6;

FIG. 9 is a sectional view taken along line HH in FIG. 8;

FIG. 10 is a sectional view taken along the line BB in FIG. 4;

FIG. 11 is an enlarged plan view of a portion F in FIG. 6;

FIG. 12 is a sectional view taken along the line JJ in FIG. 11;

13 is a sectional view taken along the line KK in FIG.

FIG. 14 is an explanatory diagram of a land used in the electronic control unit.

FIG. 15 is a perspective view showing a relationship between the land and the terminal.

FIG. 16 is an enlarged plan view of a portion G in FIG. 6;

FIG. 17 is a sectional view taken along the line PP in FIG. 16;

FIG. 18 is a sectional view taken along line CC in FIG. 4;

19 is a right side view of the electronic control unit.

20A is a vertical cross-sectional front view showing a soldering state of a conventional terminal and a board, and FIG. 20B is a vertical cross-sectional side view of the same state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Main board (board) 21a Connection hole 22 Land part 25 Terminal 25a Solder part 25b Midway part 25c Convex part (locking part) 30 Terminal plate 34 Terminal press-fit part 34a Positioning hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yayoi Maki 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture F-term (reference) in Yazaki Parts Co., Ltd. 5E336 AA09 BB02 BC01 CC02 CC51 DD02 EE01 GG05 GG09

Claims (2)

[Claims] 1. A soldered portion of a terminal is inserted into a connection hole of a substrate, and a land portion of the substrate and a soldered portion of the terminal are held by soldering in a state where the terminal is raised. In the terminal holding structure, a terminal plate for guiding a soldered portion of the terminal is provided in a connection hole of the substrate at a position facing the substrate with a predetermined clearance therebetween, and the terminal plate is provided with an intermediate portion of the terminal. A terminal holding structure, wherein a positioning hole for holding is provided, and a locking portion for locking in the positioning hole of the terminal plate is provided in a middle portion of the terminal. 2. The terminal holding structure according to claim 1, wherein the positioning hole of the terminal plate is provided in a terminal press-fitting portion protruding above the terminal plate.