阅读说明：本技术 电路装置、电路装置的制造方法以及连接器 (Circuit device, method for manufacturing circuit device, and connector ) 是由 小森洋和 川岛直伦 平井宏树 东小园诚 守安圣典 于 2018-06-26 设计创作，主要内容包括：ECU(1)具备电路基板(10)、固定于电路基板(10)的连接器(20)、以及将电路基板(10)和连接器(20)覆盖的树脂部(50)。连接器(20)具备壳体主体(22)和从壳体主体(22)突出的夹断接受部(27)。夹断接受部(27)具备：凸缘部(28),其从壳体主体(22)向外侧突出；和可挠壁(29),其从凸缘部(28)延伸,以越往顶端而去越接近壳体主体(22)的方式倾斜,可挠壁(29)的一部分埋设于树脂部(50)。(The ECU (1) is provided with a circuit board (10), a connector (20) fixed to the circuit board (10), and a resin section (50) covering the circuit board (10) and the connector (20). The connector (20) is provided with a housing main body (22) and a pinch-off receiving portion (27) protruding from the housing main body (22). The pinch-off receiving section (27) is provided with: a flange portion (28) protruding outward from the housing main body (22); and a flexible wall (29) extending from the flange portion (28) and inclined so as to approach the case body (22) as it goes toward the tip end, wherein a part of the flexible wall (29) is embedded in the resin portion (50).)

1. A circuit device includes a circuit board, a connector fixed to the circuit board, and a resin portion covering the circuit board and the connector,

the connector includes a housing main body and a pinch-off receiving portion projecting from the housing main body,

the pinch-off receiving portion includes: a protruding portion protruding outward from the case main body; and an inclined wall extending from the protruding portion and inclined so as to approach the housing main body as it goes toward the tip end, wherein a part of the inclined wall is embedded in the resin portion.

2. The circuit device according to claim 1, wherein the housing main body includes a cylindrical cover portion capable of accommodating a counterpart connector therein,

the pinch-off receiving portion is continuous from the cover portion.

3. The circuit device according to claim 1 or claim 2, wherein the pinch-off receiving portion is arranged over an entire circumference of the case main body.

4. A method of manufacturing a circuit device, comprising:

a mounting step of mounting a circuit board and a connector fixed to the circuit board in a molding die; and

a resin portion forming step of forming a resin portion that covers the circuit board and the connector by flowing a molten resin into the inside of the molding die and solidifying the molten resin,

the molding die includes a pinch-off portion that cuts off a flow of resin to the outside of the molding die between the molding die and the connector by pressing the connector,

the connector includes a housing main body and a pinch-off receiving portion projecting from the housing main body,

the pinch-off receiving portion includes: a protruding portion protruding outward from the case main body; and a flexible wall extending from the protrusion, the flexible wall being capable of flexing proximate to the housing body,

in the resin portion forming step, the pinch-off portion presses the flexible wall.

5. A connector includes a housing main body and a pinch-off receiving portion projecting from the housing main body,

the pinch-off receiving portion includes: a protruding portion protruding outward from the case main body; and a flexible wall extending from the protrusion, the flexible wall being flexible in a manner to approach the housing body.

Technical Field

The technology disclosed in the present specification relates to a circuit device, a method for manufacturing the circuit device, and a connector.

Background

As a waterproof structure of a circuit device including a circuit board and a connector fixed to the circuit board, a structure is known in which the entire circuit board and a portion of the connector fixed to the circuit board are covered with a mold resin. The molding resin is formed by placing the circuit board and the connector in a molding die and filling the die with a resin in a molten state (see patent document 1).

Disclosure of Invention

Problems to be solved by the invention

In molding, the connector housing is strongly held between the upper and lower molding dies, whereby the flow of the resin is cut between the connector housing and the molding dies, and the leakage of the molten resin out of the dies is restricted (hereinafter, the case where the flow of the resin is cut in this manner is referred to as "resin cutoff", and a portion where the resin is cut in the molding dies is referred to as a pinch-off portion). In this case, when the molding die is strongly pressed against the connector housing in order to reliably cut off the resin, the connector housing may be deformed.

Means for solving the problems

The circuit device disclosed in the present specification includes a circuit board, a connector fixed to the circuit board, and a resin portion covering the circuit board and the connector, the connector includes a housing main body and a pinch-off receiving portion protruding from the housing main body, and the pinch-off receiving portion includes: a protruding portion protruding outward from the case main body; and an inclined wall extending from the protruding portion and inclined so as to approach the housing main body as it goes toward the tip end, wherein a part of the inclined wall is embedded in the resin portion.

In addition, a method for manufacturing a circuit device disclosed in the present specification includes: a mounting step of mounting a circuit board and a connector fixed to the circuit board in a molding die; a resin portion forming step of forming a resin portion for covering the circuit board and the connector by causing molten resin to flow into the inside of the molding die and solidifying the molten resin, the molding die including a pinch-off portion for cutting off a flow of the resin to the outside of the molding die between the pinch-off portion and the connector by pressing the connector, the connector including a housing main body and a pinch-off receiving portion projecting from the housing main body, the pinch-off receiving portion including: a protruding portion protruding outward from the case main body; and a flexible wall extending from the protruding portion and capable of flexing so as to approach the housing main body, wherein in the resin portion forming step, the pinch-off portion presses the flexible wall.

According to the above configuration, in the step of molding the resin portion, the pressing force from the pinch-off portion provided in the molding die can be received by the flexible wall (inclined wall), and therefore, the deformation of the case main body can be suppressed.

In the above configuration, the housing main body may include a cylindrical cover portion capable of accommodating the mating connector therein, and the pinch-off receiving portion may be continuous from the cover portion.

Since the cover portion has a cavity inside, it is highly likely that deformation will occur when the portion receiving the pressing force of the pinch-off portion of the molding die is the cover portion, for the sake of convenience in designing the circuit device. In this case, the pinch-off receiving portion is configured to be continuous from the cover portion, so that deformation of the cover portion can be suppressed.

In the above configuration, the pinch-off receiving portion may be disposed over an entire circumference of the housing main body.

With this configuration, deformation of the case main body can be reliably avoided.

Effects of the invention

According to the circuit device, the method of manufacturing the circuit device, and the connector disclosed in the present specification, it is possible to suppress deformation of the housing main body due to the pressing force from the molding die.

Drawings

Fig. 1 is a plan view of an ECU of the embodiment.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a perspective view of the connector of the embodiment.

Fig. 4 is a top view of an embodiment connector.

Fig. 5 is a side view of an embodiment connector.

Fig. 6 is a sectional view taken along line B-B of fig. 4.

Fig. 7 is a sectional view showing a case where a resin portion is formed in the embodiment.

Detailed Description

The embodiment will be described with reference to fig. 1 to 7. The circuit device of the present embodiment is an ECU (Electrical control Unit) 1 for controlling braking, which is disposed in a Tire House (Tire House) of a vehicle in an electric brake system. As shown in fig. 2, the ECU1 includes: a circuit board (10); a connector 20 fixed to the circuit board 10; and a synthetic resin portion 50 formed by molding and covering the circuit board 10 and the connector 20.

The circuit board 10 is a known component, and has a conductive circuit (not shown) formed on one surface or both surfaces of an insulating plate made of an insulating material by a printed wiring technique, and electronic components (not shown) mounted thereon.

As shown in fig. 3, the connector 20 includes: a connector housing 21; two fixing parts 31 for fixing the connector housing 21 to the circuit board 10; and a plurality of terminal fittings 41 assembled to the connector housing 21 and connected to the conductive circuit on the circuit board 10.

The connector housing 21 is made of synthetic resin, and as shown in fig. 3, includes a housing main body 22 and a pinch-off receiving portion 27 continuous from the housing main body 22.

As shown in fig. 6, the housing main body 22 includes a terminal holding wall 23, a hood 24 continuous from the terminal holding wall 23, and a surrounding wall 25 similarly continuous from the terminal holding wall 23.

As shown in fig. 6, the terminal holding wall 23 is a substantially plate-shaped portion that holds the terminal fitting 41, and has a plurality of press-fitting holes 23H through which the terminal fitting 41 can be press-fitted. As shown in fig. 6, the hood 24 is a square cylindrical portion extending from one surface of the terminal holding wall 23, and has an opening 24A on the side opposite to the terminal holding wall 23. The counterpart connector can be received in an internal space of the connector housing 21 surrounded by the terminal holding wall 23 and the hood 24.

As shown in fig. 6, the surrounding wall portion 25 is a square-tube-shaped portion extending from the terminal holding wall 23 in a direction opposite to the hood portion 24, and is composed of a bottom wall 25A disposed along the circuit board 10, a top wall 25B parallel to the bottom wall 25A, and two side walls 25C connecting the bottom wall 25A and the top wall 25B. As shown in fig. 4, the two side walls 25C each have a mounting groove 26.

As shown in fig. 6, the pinch-off receiving portion 27 includes: a flange portion 28 (corresponding to a protruding portion) extending perpendicularly outward from the hood portion 24; and a flexible wall 29 extending perpendicularly from an extended end of the flange portion 28. Flexible wall 29 extends from flange 28 in a direction toward terminal holding wall 23 (leftward in fig. 6). In a state before the resin portion 50 is formed by molding, the flexible wall 29 is disposed in parallel with the cover portion 24 at a distance, and can be bent in a direction approaching the cover portion 24, with an end portion connected to the flange portion 28 being a base end portion 29A and an end portion on the opposite side being a free end portion 29B. The pinch-off receiving portion 27 is disposed over the entire circumference of the cover portion 24.

Each of the two fixing parts 31 is a member formed by press working a metal plate material, and as shown in fig. 3, includes a substantially rectangular main body portion 32 and a plate-like attachment portion 33 extending perpendicularly from one side of the main body portion 32, and is L-shaped as a whole. A plurality of locking pieces are disposed on each of two side edges (two sides perpendicular to the side to which the attachment portion 33 is connected) of the main body portion 32, but although not shown in detail, an engagement receiving portion for engaging with the plurality of locking pieces is disposed on a groove wall of each mounting groove 26.

As shown in fig. 4, one fixing component 31 is housed in the mounting groove 26 disposed on the one side wall 25C, and the other fixing component 31 is housed in the mounting groove 26 disposed on the other side wall 25C. Each of the fixing components 31 is held in a positioned state by engaging the engaging piece with the engaging receiving portion.

Each of the plurality of terminal fittings 41 is a bent member of a metal elongated plate material, and as shown in fig. 6, includes a projecting portion 42 penetrating the terminal holding wall 23, an intermediate portion 43 extending substantially perpendicularly from one end of the projecting portion 42, and a substrate connection portion 44 extending from an extending end of the intermediate portion in a direction opposite to the projecting portion 42. The distal end of the protruding piece 42 is disposed inside the cover 24. The intermediate portion 43 and the board connecting portion 44 are disposed outside the connector housing 21.

In a state where the connector 20 is assembled to the circuit board 10, as shown in fig. 2, a portion of the cover portion 2 where the pinch-off receivers 27 are provided and a portion closer to the opening 24A than the portion where the pinch-off receivers 27 are provided protrude outward (rightward in fig. 2) from an end edge of the circuit board 10, and the remaining portion is arranged along one surface of the circuit board 10. The board connection portion 44 is disposed along the circuit board 10 and electrically connected to the conductive circuit by reflow soldering. Although not shown in detail, the mounting portion 33 is disposed along the circuit board 10 and is attached to the circuit board 10 by reflow soldering.

As shown in fig. 2, the resin portion 50 covers the entire circuit board 10 and most of the connector 20 in a close contact state. The entire circuit board 10 is embedded in the resin portion 50. A part of the connector 20 adjacent to the opening 24A protrudes from the resin portion 50, and the remaining part is embedded in the resin portion 50.

The steps for manufacturing the ECU1 configured as described above are as follows, for example.

First, the terminal fitting 41 and the fixing fitting 31 are assembled to the connector housing 21.

Next, the connector 20 is fixed to the circuit board 10 by reflow soldering. First, solder is applied in advance to each portion to be soldered on one surface of the circuit board 10. Next, the connector 20 is mounted on one surface of the circuit board 10. In this case, the following configuration is adopted: in the cover portion 24, a portion provided with the pinch-off receiving portion 27 and a portion closer to the opening portion 24A than the portion provided with the pinch-off receiving portion 27 protrude from an end edge of the circuit board 10, and the remaining portion is arranged along one surface of the circuit board 10. In a state where the connector 20 is mounted on the circuit board 10, the board connection portion 44 of each terminal part 41 is mounted on the solder, and the mounting portion 33 of each fixing part 31 is also mounted on the solder in the same manner. Next, the circuit board 10 on which the connector 20 is mounted is moved in a reflow furnace, not shown, to melt the solder. Then, when the solder is cooled and solidified, the substrate connection portion 44 of each terminal part 41 is fixed to the corresponding conductive circuit to be electrically connected, and the mounting portion 33 of each fixing part 31 is fixed to the circuit substrate 10. Thereby, the connector housing 21 is fixed to the circuit board 10.

Next, the circuit board 10 on which the connector 20 is mounted is moved in a reflow furnace, not shown, to melt the solder. Then, when the solder is cooled and solidified, the substrate connection portion 44 of each terminal part 41 is fixed to the corresponding conductive circuit to be electrically connected, and the mounting portion 33 of each fixing part 31 is fixed to the circuit substrate 10.

Next, the resin portion 50 is formed by molding. As shown in fig. 7, a molding die 60 for performing molding is composed of an upper die 61 and a lower die 62 which can be opened and closed in the vertical direction, and a cavity 63 is formed inside the molding die 60 in accordance with the shape of the resin portion 50.

The circuit board 10 to which the connector 20 is fixed is set in the lower mold 62, and the upper mold 61 is closed from above to close the molding die 60 (setting step). The upper mold 61 includes an upper mold pinching portion 61A (pinching portion), the lower mold 62 includes a lower mold pinching portion 62A (pinching portion), and the connector housing 21 is firmly held between the upper mold 61 and the lower mold 62 in a state where the upper mold pinching portion 61A and the lower mold pinching portion 62A are in contact with the flexible wall 29 over the entire circumference. Flexible wall 29 is pressed by upper die pinch-off portion 61A and lower die pinch-off portion 62A and is bent toward cover 24. Further, due to the force to restore flexible wall 29, upper die pinch-off portion 61A and lower die pinch-off portion 62A are strongly pressed by flexible wall 29. Thus, the cover portion 24 is not directly subjected to the contact pressure of the upper die pinch-off portion 61A and the lower die pinch-off portion 62A, but is received by the flexible wall 29, so that deformation of the cover portion 24 can be suppressed.

Next, molten resin is injected into the cavity 63 formed in the molding die 60 (resin portion forming step). At this time, the upper die pinch-off portion 61A and the lower die pinch-off portion 62A are strongly pressed by the flexible wall 29, and thus the flow of the resin to the outside of the molding die 60 (the flow of the resin) is cut off between the upper die pinch-off portion 61A and the lower die pinch-off portion 62A and the flexible wall 29.

When the molding die 60 is filled with the resin, the resin is cooled and solidified. Thereby, the resin portion 50 is formed.

When the resin is cured, the molding die 60 is opened in the vertical direction, and the completed ECU1 is taken out of the die. In the resin portion forming step described above, since the molten resin is injected and solidified in a state where the flexible wall 29 is bent by the upper die pinch-off portion 61A and the lower die pinch-off portion 62A, in the completed ECU1, the flexible wall 29 is in a state of being inclined such that the free end portion 29B is closer to the cover portion 24 than the base end portion 29A, and constitutes an inclined wall. The free end portion 29B is embedded in the resin portion 50, and the remaining portion (the portion where the upper die pinch-off portion 61A and the lower die pinch-off portion 62A abut during molding) including the base end portion 29A is exposed to the outside from the resin portion 50.

As described above, the ECU1 of the present embodiment includes the circuit board 10, the connector 20 fixed to the circuit board 10, and the resin portion 50 covering the circuit board 10 and the connector 20. The connector 20 includes a housing main body 22 and a pinch-off receiving portion 27 protruding from the housing main body 22. The pinch-off receiving portion 27 includes: a flange portion 28 protruding outward from the case main body 22; and a flexible wall 29 extending from the flange portion 28 and inclined so as to be closer to the case main body 22 as it goes to the tip end, and a part of the flexible wall 29 is embedded in the resin portion 50.

The method of manufacturing the ECU1 of the present embodiment includes: a mounting step of mounting the circuit board 10 and the connector 20 fixed to the circuit board 10 in a molding die 60; and a resin portion forming step of injecting a molten resin into the molding die 60 and solidifying the molten resin. The molding die 60 includes an upper die pinch-off portion 61A and a lower die pinch-off portion 62A, and the upper die pinch-off portion 61A and the lower die pinch-off portion 62A cut off the flow of the resin to the outside of the molding die 60 between the connector 20 and the upper die pinch-off portion 61A and the lower die pinch-off portion 62A by pressing the connector 20. The connector 20 includes a housing main body 22 and a pinch-off receiving portion 27 protruding from the housing main body 22, and the pinch-off receiving portion 27 includes: a flange portion 28 protruding outward from the case main body 22; and a flexible wall 29 extending from the flange portion 28 and capable of flexing so as to approach the housing main body 22. In the resin portion forming step, upper mold pinch-off portion 61A and lower mold pinch-off portion 62A press flexible wall 29.

According to the above configuration, in the step of molding the resin portion 50, the pressing force from the upper mold pinch-off portion 61A and the lower mold pinch-off portion 62A provided in the molding die 60 can be received by the flexible wall 29, so that the deformation of the case main body 22 can be avoided.

The housing main body 22 includes a cylindrical cover portion 24 capable of accommodating the mating connector therein, and the pinch-off receiving portion 27 is continuous from the cover portion 24.

Since the cover portion 24 has a cavity inside, it may be deformed when directly receiving the pressing force of the lower die pinch-off portion 62A of the upper die pinch-off portion 61A. In the present embodiment, the pinch-off receiving portion 27 is continuous from the cover portion, and therefore, deformation of the cover portion 24 can be suppressed.

Further, since the pinch-off receiving portion 27 is disposed over the entire circumference of the case main body 22, deformation of the case main body 22 can be reliably avoided.

< other embodiment >

The technology disclosed in the present specification is not limited to the embodiments described above and illustrated in the drawings, and includes, for example, the following various embodiments.

(1) In the above embodiment, flexible wall 29 extends from flange portion 28 in a direction approaching terminal holding wall 23 (leftward in fig. 2), but it may extend from flange portion 28 in a direction approaching opening 24A of cover portion 24 (rightward in fig. 2).

(2) In the above embodiment, the pinch-off receiving portion 27 extends from the cover portion 24, but the pinch-off receiving portion may be continuous from a portion of the case main body 22 different from the cover portion 24.

(3) In the above embodiment, the pinch-off receivers 27 are disposed over the entire circumference of the case main body 22, but even if the pinch-off receivers are disposed only in a part of the case main body 22, a certain effect of suppressing deformation of the case main body 22 can be obtained.

Description of the reference numerals

1: ECU (Circuit arrangement)

10: circuit board

20: connector with a locking member

22: shell body

24: cover part

27: pinch-off receiver

28: flange part (projection)

29: flexible wall (inclined wall)

50: resin part

60: forming die

61A: upper mould clipping part (clipping part)

62A: lower die clip part (clip part)