JP2000299218A - Circuit unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit unit, constituted such that a stable electrical connection can be maintained in response to displacement of a coil and simplification of manufacturing processes, can be achieved. SOLUTION: A terminal receiving cavity 30, provided in a case body, accepts a base portion 51 of an electrical terminal 50 so that the terminal is freely movable at least in one direction. A welded plate 63 welded to an electrical component extends in the vicinity of the base portion 51 in a direction orthogonal thereto. A board connecting portion 52 connected to a circuit board is extended by a sufficient length from the base portion 51 and can be deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a circuit unit for accommodating a circuit board including a circuit such as a control circuit and other electric parts.

[0002]

2. Description of the Related Art An example of this type of circuit unit is disclosed in Japanese Unexamined Patent Publication No.
-511964. The disclosed circuit unit is intended to be used as a vehicle brake control circuit, and is configured to accommodate a plurality of coils and an electronic control unit. The plurality of coils are connected to electric terminals supported by the case.

According to this application, the electric terminal is required to maintain a stable connection even when the coil is displaced in the case. For this reason, the connection portion between the electric terminal and the coil disclosed in the above publication constitutes a bent structure. Furthermore,
The electric terminals are firmly supported in the case so as to be embedded in the resin in order to maintain a stable connection while allowing the bending in the bent structure.

[0004]

However, according to the above-described circuit unit, since the electric terminals are embedded in the resin, the manufacturing process becomes complicated. Accordingly, an object of the present invention is to provide a circuit unit having a configuration capable of maintaining a stable electrical connection corresponding to the displacement of a coil and simplifying a manufacturing process.

[0005]

SUMMARY OF THE INVENTION The present invention provides a case for accommodating a circuit board and an electric component, and interconnects the circuit board and the electric component which are previously held in the case in a floating manner and thereafter mounted. A circuit unit including an electrical terminal.

[0006] Preferably, the electric terminal is arranged so as to be freely movable in at least a sliding direction by a guide means provided in the case.

Preferably, the electric terminal has a connection portion received in a connection through hole of the circuit board.

Preferably, the connecting portion has a deformable structure.

Preferably, a through hole for receiving a terminal extending from the electric component is provided in each of the electric components in the case, and a pair of electric terminals are formed along a side edge of the through hole facing the electric component. They are arranged to extend substantially in parallel. According to an embodiment described later, the electric component is a coil device.

[0010] Preferably, the pair of electric terminals have mirror-image shapes with each other, and are slidable at least in respective longitudinal directions.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial plan view showing a housing body of a circuit unit according to the present invention.

As shown in FIG. 1, a circuit unit 10 according to the present embodiment accommodates a brake control circuit of an automobile, and is formed of resin to form the circuit unit 10.
Has a case main body 20 which constitutes the main part. The case main body 20 is configured to accommodate a circuit board (not shown) and a plurality of coils. FIG. 1 shows a first side on which the circuit board is mounted, and a plurality of coils are arranged on a second side facing the circuit board. You. The first side and the second side are separated by a partition wall 23 except for a plurality of through-holes 21 and a pair of electric wiring holes 22 which are substantially rectangular. The plurality of coils are arranged on the rear side corresponding to each of the convex structures 24 formed on the partition wall 23,
From each of them, a pair of coil terminals extend to the first side, that is, the circuit board mounting side, through the through holes 21. Circuit unit 1
0 is completed by arranging a plurality of coils, circuit boards, and other electrical wiring to realize electrical interconnection, and then attaching protection cover parts to each side. The present invention relates to a configuration for realizing interconnection between a circuit board and a coil inside the circuit unit 10. The details will be described below step by step.

FIGS. 2A and 2B are partially enlarged views of the vicinity of an opening formed in the housing body, FIG. 2A being a plan view, and FIG.
FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a diagram showing electric terminals that can be mounted on the housing body.
(A) is a plan view and (b) is a front view. FIG.
It is a diagram showing an electric terminal mounted on the housing body,
(A) is a top view, (b) is a figure which shows the cross section of the housing main body along line BB in (a), together with the front view of an electric terminal.

As described above, the pair of coil terminals extending from each coil extend through each through hole 21 to the circuit board mounting side. According to the present embodiment, the coil terminals are configured to be connected to the circuit board via separate electric terminals. According to FIG. 2, a terminal receiving cavity 30 for receiving the pair of electric terminals is provided along the opposing edge of the through hole 21. The pair of terminal receiving cavities 30 has a mirror image-symmetric shape. The terminal receiving cavity 30 communicates with the through-hole 21 and extends across the end face thereof, and extends from the through-hole 21 to a relatively long first portion 31 and a second portion relatively short to the opposite side. 32. The first portion 31 and the second portion 32 have a bottomed configuration by bottom walls 33 and 34. A projection 36 is provided on the opposite end face 35 of the through hole 21 that forms a part of the terminal receiving cavity 30. It should also be noted that the terminal receiving cavity 30 is defined by an upright wall 37 projecting perpendicularly from the partition wall 23 toward the top side.

FIG. 3 shows an electrical terminal 50 received in the terminal receiving cavity 30. As described above, according to the present embodiment, a pair of terminal receiving cavities 30 are prepared in mirror image symmetry. However, since the components of each electric terminal 50 are the same, only one of them will be described. I do. The electric terminal 50 is manufactured by punching and bending sheet metal, and includes a base 51 placed in the same plate surface, a board connecting part 52 extending from one end of the base 51 to the top side, and a board connecting part 52. And a coil terminal connecting portion 53 extending to the top side near the opposing end sufficiently distant from the front end. The base 51 is formed with a pair of slots 54, 55 extending longitudinally crosswise from a bottom end 61 to a top side, thereby defining a latch 57 including an engagement hole 56 therebetween. At the same time, a first plate portion 58 having a relatively large area and a second plate portion 59 having a relatively small area are defined on both sides of the latch 57.

The substrate connecting portion 52 extends from the top end 62 of the base portion 51 to the top side and then extends in the horizontal direction so that the direction in the horizontal plane is substantially L.
It extends in the shape of a letter and extends further toward the top from that position. The board connecting portion 52 is received in a through hole provided in a circuit board (not shown) and is connected by soldering to the through hole, and the solder connecting portion 66 is located near the front end. In this way, by forming the board connecting portion 52 in a bent and deformable structure, adverse effects on the solder connecting structure due to relative displacement of the base 51 of the electric terminal 50 and the like are prevented. In particular, this configuration is important so as not to cause a defect in the solder connection in a later-described welding step of the electric terminal 50 and the coil terminal, and subsequent assembling or maintenance work.

The coil terminal connecting portion 53 is connected by welding to a coil terminal extending from a coil (not shown). The coil terminal connecting portion 53 extends from the top end 62 to the vertex side, and is bent to the base 51 in a direction orthogonal to the base. Thus, a relatively wide welding plate portion 63 is defined. In particular, it should be noted that the base 51 and the welding plate 63 are provided at relatively close positions so that the welding plate 63 is not elastically deformed with respect to the base 51. The advantages of this configuration will be understood from the following description.

FIG. 4 shows the electric terminal 50 shown in FIG.
3 shows a state in which the terminal is received by the terminal receiving cavity 30. As shown, the first plate portion 58 is received in the first portion 31 of the terminal receiving cavity 30, and the second plate portion 59 is received in the second portion 32 of the terminal receiving cavity 30. It is placed so as to substantially contact the walls 33 and 34. In addition, the engagement hole 56 of the latch 57 is engaged with the projection 36, so that the electric terminal 50 is prevented from coming off. The electric terminal 50 can be easily assembled by being inserted from the top side of the terminal receiving cavity 30. Especially when the electric terminal 50 is assembled into the terminal receiving cavity 30,
It should be noted that the latch 57 is displaced slightly inward in the through hole 21.

It should further be noted that the electrical terminals 50 are held in the terminal receiving cavity 30 in a freely movable manner.
As can be seen in particular from FIG.
The first portion 31 and the second portion 32 of the “0” are set to be sufficiently larger in size than the first plate portion 58 and the second plate portion 59 of the electric terminal 50. The dimension is set sufficiently larger than the protrusion 36 in the height direction. Thereby, the base 51 of the electric terminal 50 can be slid at least in its length direction (see the arrow C in FIG. 4A).
Such sliding movement of the base 51 can be guided to the inner surface of the terminal receiving cavity 30. Since the engagement between the latch 57 and the projection 36 is performed at the center side position of the base 51, it is possible to make it possible to slightly move in the turning direction by optimizing the dimensions.

It is advantageous to hold the electric terminal 50 so as to be freely movable in the process of connecting and assembling the circuit unit 10. The electric terminal 50 is welded to the coil terminal as described above. During the welding process, the welding tool clamps the coil terminal and the welding plate 63. Electrical terminal 5
A run of zero acts to compensate for the relative displacement in this welding process. That is, when a slight displacement occurs, the electric terminal 50 slides and moves during the clamping by the welding tool, so that the welding plate portion 63 and the coil terminal can be reliably brought into contact. As described above, the welding plate portion 63 is configured so as not to be elastically deformed with respect to the base portion 51, so that a reliable operation of displacement compensation is guaranteed. By making the electric terminal 50 itself displaceable with respect to the case body 20 in this manner, even if a large displacement occurs, it can be surely compensated. The displacement in the direction perpendicular to the base 51 can be compensated for by setting the welding plate 63 to a sufficiently large size.

Although the details of the circuit unit according to the present invention have been described above, this is merely an example, and does not limit the present invention. Various modifications and alterations are possible by those skilled in the art.

[0023]

The present invention provides a circuit unit including a case for accommodating a circuit board and an electric component, and an electric terminal for interconnecting the circuit board and the electric component which are held in advance in the case in a floating manner and mounted thereafter. Is provided, it is possible to reliably compensate for a relatively large displacement between the terminals of the electric components or the circuit board and the electric terminals while having a simple structure that can be manufactured and assembled relatively easily.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing a housing body of a circuit unit according to the present invention.

FIGS. 2A and 2B are partially enlarged views in the vicinity of an opening formed in a housing body, where FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line AA in FIG.

FIGS. 3A and 3B are diagrams showing electric terminals that can be mounted on a housing main body, wherein FIG. 3A is a plan view and FIG. 3B is a front view.

4A and 4B are diagrams showing electric terminals mounted on the housing body, wherein FIG. 4A is a plan view, and FIG. 4B is a line B in FIG.
The figure which shows the cross section of the housing main body along -B with the front view of an electric terminal.

[Explanation of symbols]

 10 circuit unit 20 case body 50 electric terminal

Claims (1)

[Claims] A case for accommodating a circuit board and an electric component;
And a circuit unit including an electric terminal interconnecting the circuit board and the electric component, which is held in advance in the case in a floating manner and is placed thereafter.