JP2013084642A - Resin case, manufacturing method thereof, and electronic control device using resin case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin case with improved reliability.SOLUTION: A resin case has a through path communicating a connector with an inside part in which a circuit board is mounted. The through path is constituted by plural branch passages, and a tip of at least one of the branch passages is sealed with resin, and a shape of resin sealing is conical. When a height of the conical shape is designated as H and an outside diameter of a bottom face of the conical shape is designated as L, H>1/2L is satisfied.

Description

  The present invention relates to a resin case in which an insert member is inserted and an electronic control device using the resin case, and in particular, a composite integrated resin molded product in which a plurality of electrical connection terminals are integrally insert-molded with a resin, and the same The present invention relates to an electronic control device using a molded product.

  As the computerization progresses, in the resin case body in which a plurality of terminals for electrical connection with the outside are insert-molded with resin, a case is used to relieve the internal pressure against the internal pressure change of the case internal air due to the temperature change around the case A communicating through hole that bypasses the inside and the outside is provided.

  In addition, in order to prevent water from entering the outer through-hole opening, a measure of waterproofing with a seal member such as packing is generally employed in the connector.

  Furthermore, since the direction of the connector also corresponds to the mounting space of the parts, it is required to bend the resin case body in the vertical direction.

  In the resin case main body, gel is used to protect the circuit board on which the electronic components are mounted inside the main body. Therefore, it is necessary to prevent the gel from flowing out.

  In such a case, in Patent Document 1, a through hole having openings opened in three directions is formed in advance by a mold for molding a case, and after the resin is cooled and solidified, it is taken out from the mold and is separate from molding. The resin in the vicinity of the opening was melted at one location of the opening that was opened in three directions in the secondary processing operation as a process, and the opening was closed with a trapezoidal or dome shape.

JP 2004-55829 A

  However, when the opening hole has a trapezoidal or dome shape as described in Patent Document 1, the pushing into the hole back direction is excessive, and most of the molten resin used for sealing flows into the hole inside the hole. End up. Furthermore, the distance between the interface inside the hole and the trapezoidal or dome-shaped surface becomes close, and there is a problem that sealing is likely to occur due to water immersion from the outside.

  An object of the present invention is to provide a resin case with improved reliability.

  In order to achieve the above object, the resin case of the present invention is a resin case having a through passage that communicates a connector and an inside in which a circuit board is mounted, wherein the through passage is composed of a plurality of branch passages, The tip of at least one of the branch passages is sealed with resin, and the shape of the resin seal is a cone shape, the height of the cone shape is H, and the outside of the bottom surface of the cone shape is When the diameter is L, H> 1 / 2L.

  According to the present invention, it is possible to provide a resin case with improved reliability.

The resin case SS sectional drawing of 1st Example. The top view of the resin case of 1st Example. The top view of the resin case of 1st Example. Sectional drawing before resin case sealing of 1st Example. The partial expanded sectional view before resin case sealing of the 1st example. The partial expanded sectional view at the time of resin case sealing of the 1st example. The partial expanded sectional view after the resin case sealing of 1st Example. The partial expanded sectional view after the resin case sealing of 1st Example. The partial expanded sectional view at the time of the conventional resin case sealing. The partial expanded sectional view after the conventional resin case sealing. The partial expanded sectional view after the conventional resin case sealing. The partial expanded sectional view at the time of resin case sealing of 2nd Example. The partial expanded sectional view after resin case sealing of 2nd Example. The partial expanded sectional view after resin case sealing of 2nd Example. The partial expanded sectional view at the time of resin case sealing of 3rd Example. The partial expanded sectional view after resin case sealing of 3rd Example. The partial expanded sectional view after resin case sealing of 3rd Example. The partial expanded sectional photograph after the resin case sealing of 1st Example. Partial enlarged cross-sectional photograph after resin case sealing. The partial expanded cross-section photograph after resin case sealing of 2nd Example.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view SS of a resin case 1 shown as a first embodiment according to the present invention.

  Here, the resin case 1 is made as shown in FIG.

  Specifically, the resin case 1 is provided as a portion for assembling a plurality of terminals 5 and the sensing function of the resin case 1 and attaching the resin case 1 to the vehicle for electrical connection with the outside. This is an insert-molded product in which a metal base 6 is used as an insert member and is integrally wrapped with a resin 9. FIG. 3 shows the appearance of the resin case 1 as viewed from the Q direction.

  Further, the resin case 1 is used as an electronic control device in which a circuit board is mounted inside the case frame 7 and a sensing function is added in an assembling process. Here, the electronic control device is assembled with other parts on the back side and the front side of the case frame 7 with an adhesive to protect the circuit board and provide confidentiality. When this adhesive is cured, the heat treatment is accompanied and the air in the sealed case frame 7 expands, so that it is necessary to provide the through hole 2 for releasing the expanded air to the outside. At this time, since it is necessary to prevent water from entering from the outside, there has been a restriction that the waterproof structure is maintained when it is assembled in the vehicle, and the connector 3 is installed inside the connector 3.

  Therefore, in order to show the structure and manufacturing method of the resin case 1 in detail, it will be described below with reference to the drawings.

  The resin case 1 has an insert member set in a mold, is integrally insert-molded with resin, and is then taken out from the mold. FIG. 4 shows a partial sectional view of the resin case 1 at that time.

  The resin case 1 has an external connector 3 facing a substantially vertical plane shown in FIG. 4 with respect to the surface 11 on which the circuit board of FIG. 2 is mounted, and further includes an inside of the connector 3 and an interior of the circuit board. There is a through hole 2 that communicates, and the through hole 2 is a passage that is bent in three directions. The passage is a passage 2a that is formed in a direction substantially perpendicular to the circuit board mounting surface 11 and a connector in the connector. And a bypass passage 2c that bypasses the two passages in a direction substantially parallel to the circuit board mounting surface, and an opening 2d on the outside of the resin case 1 of the bypass passage 2c. As shown in FIG. 5, a chimney-like resin band 9a protruding outward in parallel with the bypass passage 2c is integrally provided at the root of the outer opening 2d. At this time, the outer shape and the plate thickness of the resin band 9a are L and T, respectively.

  As can be seen from this cross-sectional view, since the opening 2d is open to the outer surface, as described above, the opening 2d must be sealed in order to prevent water from entering from the outside.

  Therefore, a conventional method for preventing flooding at the opening 2d will be described below.

  First, as shown in FIG. 5, heat is applied to the chimney-shaped resin band 9 a site to melt the resin band 9 a site softly. Next, using a sealing jig 10b whose tip is processed into a dome shape 110 as shown in FIG. 9, the resin band is softly melted from the upper direction of the resin band 9a toward the back side of the bypass passage 2c. The sealing jig 10b is pushed in from the top of 9a in the root direction.

  At this time, in the resin band 9a that is softly melted, the resin flows following the shape of the dome shape 110 of the sealing jig 10b. From the shape of the opening 2d of the resin band 9a before flowing, the resin flows from the shape of the dome shape 110 like the resin flow 111 in the upper part of the resin band 9a first contacting the shape of the dome shape 110 of the sealing jig 10b. In the center of the opening 2d along the R surface of the dome shape, there is little space for the resin to flow in the center of the dome shape. 2c The resin flow 112 starts in the inner depth direction. In addition, since the central portion of the dome shape 110 has a shape that is relatively close to a flat surface, the force that presses the resin to the lower surface acts more greatly than the force that draws the resin to the center by the sealing jig 10b.

  The resin flows 111 and 112 sequentially operate until the tip of the sealing jig 10b reaches the root of the resin band 9a, and the resin flow at the root portion U of the resin band 9a at the final stage is like the resin flow 113. It becomes a movement. As a supplement, the resin flow 113 is brought into contact with the shape of the dome mold 110 and at the same time, is attracted to the resin flow 112 and is caused to flow in a curl shape toward the inner depth of the bypass passage 2c.

  At this time, since the resin 9 inside and around the bypass passage 2c is originally at room temperature, the resin that has flowed in a curled shape is instantaneously cooled, and the interface E is not fused with the internal interface E of the bypass passage 2c. It intervenes between the resin that flows in a curled shape.

  After a certain cooling time, the dome-shaped sealing portion 4d in which the sealing jig 10b is removed and the opening 2d is sealed has a cross-sectional shape shown in FIG.

  Here, as the distance between the interface E and the outer surface of the dome-shaped sealing portion 4d, which is the subject of the present invention, is closer, the sealing from the bypass passage 2c and the outside is insufficient, and is repeated in the use environment. Due to the thermal history received, the interface E advances to the outer surface in the same manner as the progress of cracks. When the interface E reaches the outer surface, it becomes difficult to prevent water from entering from the outside.

  In the dome-shaped sealing portion 4d sealed by the conventional manufacturing method, the outer shape L and plate thickness T of the resin band 9a, the dome-shaped sealing height H2, and the distance G between the interface E and the outer surface of the dome-shaped sealing portion 4d. The correlation was the ratio shown in FIG.

Dome-shaped sealing height H2 <Outline L / 2 of resin strip 9a ... 21
Distance G to external surface <Thickness T of resin strip 9a ... 22
FIG. 19 shows a cross-sectional photograph of the dome-shaped sealing portion 4d using an actual product. As can be seen from this cross-sectional photograph, it is confirmed that a large amount of resin in the resin band flows into the bypass passage, and that the interface inside the bypass passage is close to the upper surface of the dome-shaped sealing portion. It can also be confirmed that the above relational expression holds.

  In order to solve the above problems, as a first embodiment of the present invention, as shown in FIG. 6, the tip shape of the sealing jig 10a to be sealed is a conical shape whose cross section is an inverted V-shaped 100 shape, Therefore, the shape of the sealing portion 4a sealed by the sealing jig 10a is set in advance at a ratio as shown in FIG.

Conical sealing height H1 ≧ External shape L / 2 of resin band 9a 20
Here, the manufacturing method of this Example 1 and the flow of the resin will be described below.

  First, as shown in FIG. 5, heat is applied to the chimney-shaped resin band 9 a site to melt the resin band 9 a site softly. Next, using a sealing jig 10a whose tip is processed into an inverted V-shaped 100 as shown in FIG. 6, the resin band 9a is softly melted from the upper direction toward the inner side of the bypass passage 2c. The sealing jig 10a is pushed in from the upper part of the resin strip 9a in the root direction.

  At this time, the softly molten resin band 9a follows the inverted V-shaped 100 shape of the sealing jig 10a and the resin flows. From the shape of the opening 2d of the resin band 9a before flowing, the resin flow is reversed V like the resin flow 101 in the upper part of the resin band 9a that first contacts the inverted V-shaped 100 shape of the sealing jig 10a. Collected at the center of the opening 2d along the inclined surface of the shape 100.

  Here, as a feature of the first embodiment, the central portion of the sealing jig 10a is formed into a conical shape having an inverted V-shaped 100 shape, and further, the outer shape L / 2 of the conical sealing height H1 ≧ resin strip 9a is satisfied. Thus, the central portion of the sealing jig 10a has a deep concave portion. As a result, the resin flow 101 joins at the center of the opening 2d and then flows in the direction of the recess. This flow tends to attract the resin flow 103 at the root portion U of the resin band 9a, and is slightly downward due to the inclined surface of the sealing jig 10a, but the resin flow 103 is moved to the center of the bypass passage 2c. Show. After the concave portion is filled with the fluid resin, the surplus resin performs the resin flow 102 in the downward direction inside the bypass passage 2c.

  In addition, the amount of the excess resin greatly reduces the amount of the excess resin flowing into the bypass passage 2c as shown in FIG. Since there is almost no plane area at the center of the sealing jig 10a (the action of pushing downward), and the area of the inclined surface occupies almost the entire area, the force to move the resin toward the center is large, bypassing It is considered that the amount of surplus resin flowing into the passage 2c has been greatly reduced.

  Further, since the compressive force can be applied to the resin that has been moved to the center by the inclined surface, the function of improving the hermeticity of the sealed resin occurs.

  After passing through a certain cooling time, the sealing jig 4a is removed, and the conical sealing portion 4a having an inverted V-shaped 100 shape in which the opening 2d is sealed has a cross-sectional shape shown in FIG.

  FIG. 18 shows a cross-sectional photograph of a conical sealing portion 4a having a V-shaped 100 shape as an actual product. As can be judged from this cross-sectional photograph, the distance between the interface of the bypass passage 2c and the outer surface of the sealing portion 4a, which is the subject of the present invention, is sufficiently ensured as compared with the conventional product FIG. I understand. Thereby, the high reliability of the bypass passage 2c and the sealing from the outside can be achieved, and it can be avoided from the heat history repeatedly received in the use environment. Therefore, it is possible to prevent water from entering from the outside.

  If twisted according to the present invention, a resin case in which a plurality of terminals for electrical connection with the outside are fixed with a resin, a circuit board mounted inside the resin case, and a gel covering the circuit board are included. In the electronic control device, it is possible to perform sealing with high reliability against external water immersion, and a waterproof resin case and a waterproof electronic control device can be provided.

  Next, a second embodiment which is an embodiment of the present invention will be described.

  As shown in FIG. 12, the tip shape of the sealing jig 10c to be sealed is a conical shape having a divergent section whose cross-section is a reverse trumpet shape 120, and therefore the sealing portion 4c sealed by the sealing jig 10c is formed. The shape was preset to a ratio as shown in FIG.

Cone-shaped sealing height H3 ≧ outer dimension L / 2 of the resin band 9a 23
Here, the production method and the flow of the resin in this example will be described below.

  First, as shown in FIG. 5, heat is applied to the chimney-shaped resin band 9 a site to melt the resin band 9 a site softly. Next, a resin that is softly melted from the upper direction of the resin band 9a toward the inner side of the bypass passage 2c using the sealing jig 10c whose tip is processed into the reverse trumpet mold 120 as shown in FIG. It pushes with the sealing jig 10c from the upper part of the belt | band | zone 9a to a root direction.

  At this time, the softly molten resin band 9a follows the reverse trumpet shape 120 of the sealing jig 10c and the resin flows. From the shape of the opening 2d of the resin band 9a before flowing, the resin flows from the shape of the opening portion 2d of the sealing jig 10c to the upper portion of the resin band 9a first. Collected in the center of the opening 2d along the 120-shaped inclined surface.

  Here, as a feature of the second embodiment, the central portion of the sealing jig 10c is formed in a conical shape having a divergent shape having an inverted trumpet shape 120, and further, the outer shape L / 2 of the conical sealing height H3 ≧ resin band 9a. Therefore, the central portion of the sealing jig 10c has a deep concave portion. Accordingly, the resin flow 121 joins at the center of the opening 2d and then flows in the direction of the recess. This flow tends to attract the resin flow 123 at the root portion U of the resin band 9a, and is slightly downward due to the inclined surface of the sealing jig 10c, but the resin flow 123 is moved toward the center of the bypass passage 2c. Show. After the concave portion is filled with the fluid resin, the surplus resin performs the resin flow 122 in the downward direction inside the bypass passage 2c.

  In addition, the amount of the excess resin greatly reduces the amount of the excess resin flowing into the bypass passage 2c as shown in FIG. This has almost no planar area at the center of the sealing jig 10c (the action of pressing force downward), and the area of the reverse trumpet type inclined surface occupies almost the whole, so that the force to bring the resin to the center is large. It is considered that the amount of surplus resin flowing into the bypass passage 2c is greatly reduced.

  Further, since the compressive force can be applied to the resin that has been moved to the center by the inclined surface, the function of improving the hermeticity of the sealed resin occurs.

  After a certain cooling time, the sealing jig 4c is removed, and the conical sealing part 4c having a divergent conical shape having the shape of the inverted trumpet 120 in which the opening 2d is sealed has a cross-sectional shape shown in FIG.

  FIG. 20 shows a cross-sectional photograph of a conical sealing portion 4c having a divergent shape composed of an inverted trumpet shape 120 of an actual product. As can be judged from this cross-sectional photograph, the distance between the interface of the bypass passage 2c and the outer surface of the sealing portion 4a, which is the subject of the present invention, is sufficiently ensured as compared with the conventional product FIG. I understand. Thereby, the high reliability of the bypass passage 2c and the sealing from the outside can be achieved, and it can be avoided from the heat history repeatedly received in the use environment. Therefore, it is possible to prevent water from entering from the outside.

  In order to solve the problems of the prior art, as a third embodiment of the present invention, as shown in FIG. 15, the tip shape of the sealing jig 10d to be sealed is vertically overlapped with two dome shapes having different sizes. Therefore, the shape of the sealing portion 4d sealed by the sealing jig 10d was set to a ratio as shown in FIG.

Conical shape sealing height H4 ≧ Outline L / 2 of the resin band 9a... 24
Here, the manufacturing method of this Example 2 and the flow of the resin will be described below.

  First, as shown in FIG. 5, heat is applied to the chimney-shaped resin band 9 a site to melt the resin band 9 a site softly. Next, the resin band 9a is bypassed from above by using a sealing jig 10d processed into a two-stage dome mold 130 in which two dome molds having different tip sizes are vertically stacked as shown in FIG. Toward the back side of the passage 2c, the sealing jig 10d is pushed in from the upper part of the softly melted resin band 9a in the root direction.

  At this time, the resin band 9a that is softly melted follows the two-stage dome shape of the sealing jig 10d and the resin flows. From the shape of the opening 2d of the resin band 9a before flowing, the resin flow is the flow of the resin flow 131 at the upper part of the resin band 9a that first contacts the large-diameter dome of the two-stage dome shape 130 of the sealing jig 10d. Thus, the two-stage dome shape 130 is gathered at the center of the opening 2d along the inclined surface of the large-diameter dome.

  Here, as a feature of the present embodiment, the central portion of the sealing jig 10d is changed from the two-stage dome shape 130 shape to a substantially conical shape, and further, the outer shape L / 2 of the substantially conical sealing height H4 ≧ resin strip 9a. Therefore, the central portion of the sealing jig 10d has a deep concave portion. As a result, the resin flow 131 joins at the center of the opening 2d and then flows in the direction of the recess. This flow tends to attract the resin flow 133 at the root portion U of the resin band 9a, and is slightly downward due to the inclined surface of the sealing jig 10d, but the resin flow 133 is moved downward to the center of the bypass passage 2c. Show. After the concave portion is filled with the fluid resin, the surplus resin performs the resin flow 132 downward in the bypass passage 2c.

  In addition, the amount of the excess resin greatly reduces the amount of the excess resin flowing into the bypass passage 2c as shown in FIG. This has almost no planar area at the center of the sealing jig 10d (the action of pushing force downward), and the area of the two-step dome-shaped inclined surface occupies almost the entire area. It is considered that the amount of surplus resin flowing into the bypass passage 2c has been greatly reduced.

  Further, since the compressive force can be applied to the resin that has been moved to the center by the inclined surface, the function of improving the hermeticity of the sealed resin occurs.

  After a certain cooling time, the sealing part 4d having a substantially conical shape from the two-stage dome shape 130 shape in which the sealing jig 10d is removed and the opening 2d is sealed has a cross-sectional shape shown in FIG.

  Thereby, it can be seen that a sufficient distance between the interface of the bypass passage 2c and the outer surface of the sealing portion 4a, which is the subject of the present invention, is secured. Therefore, high reliability of sealing from the bypass passage 2c and the outside can be achieved, and it is possible to avoid the heat history repeatedly received in the use environment. Therefore, it is possible to prevent water from entering from the outside.

  As described above, if any one of the present inventions according to the first to third embodiments is twisted, a resin case in which a plurality of terminals for electrical connection with the outside are fixed with resin, and a circuit mounted inside the resin case An electronic control device having a substrate and a gel covering the circuit board is capable of highly reliable sealing against external water immersion, and provides a waterproof resin case and a waterproof electronic control device it can.

  The present invention relates to an airflow sensor that measures the amount of inflow air in the automobile field, a throttle position sensor that adjusts the air amount, an accelerator position sensor that adjusts the accelerator position, and various sensors that control and configure these sensors in series. The present invention can be applied to various sensing sensors using a waterproof resin case. In addition, any product that solves the problems of the present invention can be applied without being limited to the products listed above.

DESCRIPTION OF SYMBOLS 1 Resin case 2 Through-hole 2a, 2b, 2c Passage 2d Opening port 3 Connector 4a, 4b, 4c, 4d Sealing part 5, 8 Terminal 6 Base 7 Case frame 9 Resin 9a Resin strip 10a, 10b, 10c, 10d Sealing Jig 20, 21, 22, 23 Relational expression 100 Inverted V shape 101, 102, 103, 111, 112, 113, 121, 122, 123, 131, 132, 133 Resin flow 110 Dome shape 120 Reverse wrapper type 130 2 Step dome type E Interface G Distance H1, H2, H3, H4 Sealing height L Resin strip outer diameter P, U Site Q Direction S Section T Plate thickness

Claims (6)

In a resin case having a through path that communicates between the connector and the inside where the circuit board is mounted,
The through passage is composed of a plurality of branch passages,
The tip of at least one of the branch passages is sealed with resin,
The resin sealing shape is a conical shape, wherein H> 1 / 2L where H is the height of the conical shape and L is the outer diameter of the bottom surface of the conical shape. The resin case according to claim 1,
The resin case, wherein the conical section is an inverted V-shaped section. The resin case according to claim 1,
The resin case characterized in that the conical section is an inverted trumpet section. The resin case according to claim 1,
The resin case is characterized in that the conical shape is formed by overlapping two dome-shaped shapes having different diameters. In the resin case in any one of Claims 1 thru | or 4,
The through passage is a passage bent in three directions, a first passage formed in a direction perpendicular to a surface on which the circuit board is mounted, and a second passage formed in parallel with the direction of the connector. And a third passage formed in a direction parallel to the surface on which the circuit board is mounted and bypassing the first passage and the second passage,
A resin case having the sealing shape at a tip portion of the third passage.   An electronic control device using the resin case according to claim 1.