JP4533793B2 - Circuit board case - Google Patents

Description

  The present invention relates to a circuit board case that houses a circuit board and is attached to an attachment object such as a vehicle.

  Conventionally, a gas sensor including a sensor element that detects a specific gas component in exhaust gas of an automobile or the like is known. The sensor element of this gas sensor includes a detection element that detects a specific gas component and outputs it to the outside, and a heater element that heats and activates a sensor detection unit provided at the tip of the detection element. A single sensor element is configured by stacking these elements. In such a gas sensor, the current signal detected according to the concentration of the specific gas component by the sensor detection unit is a sensor that controls the sensor detection unit via a lead wire or an intermediate harness drawn from the rear end side of the gas sensor. Input to the control circuit.

  Next, the sensor control circuit converts the concentration signal of the specific gas component based on the input current signal, and inputs the concentration signal to an ECU (electronic control unit) provided on the vehicle side. In the ECU, the gas concentration or air-fuel ratio is calculated based on the concentration signal of the specific gas component, the calculated gas concentration or air-fuel ratio, engine speed input from another sensor group, intake pressure, Based on the operation information related to the engine such as the water temperature, the fuel injection amount in the engine and the timing of the ignition timing by the ignition device are adjusted. On the other hand, the heater element is connected to a heater control circuit that controls the energization amount of the heater element, and the heater control circuit is also connected to the ECU via a lead wire in the same manner as the sensor control circuit.

  A circuit board provided with such a sensor control circuit, a heater control circuit, and the like is generally stored in a circuit board case attached to an attachment object such as an under floor of a vehicle of an automobile. The circuit board case includes a case for housing the circuit board and a connection portion for making an electrical connection with the lead wire on the ECU side. For example, a connector (circuit board case) is known in which the connection portion is provided on the side surface of the case, and the connection portion extends substantially horizontally from the approximate center of the side surface of the case (for example, Patent Document 1). FIG. 11). The connector connecting portion is connected to a terminal connected to the lead wire on the ECU side, and includes a cylindrical connector outer portion for surrounding and protecting the metal terminal connected to the circuit board. An exterior part is provided on the side surface of the case.

In addition to this, a support part for supporting the connector exterior part is erected on the outer side surface of the top wall of the case, and the connector exterior part extends substantially horizontally from the top wall of the case with a predetermined gap. A circuit board case is also known. Then, the case, the connector exterior portion, and the support portion are integrally formed of resin, whereby the circuit board case can be easily manufactured.
JP 2002-71640 A

  However, when the circuit board case in which the connector exterior portion is extended from the support portion with a predetermined gap from the top wall of the case is integrally formed with resin, the resin cools after the resin is integrally formed. As a result of the study by the present inventors, it is found that the base portion of the support portion, which has a thickness near the top wall of the case, tends to contract as compared with the other portions. Therefore, when the circuit board case like the latter is integrally molded with resin, the base part that becomes the thickness of the support part tends to shrink compared to other parts, so that the connector connected to the support part In some cases, the exterior part falls to the top wall side of the case, and a predetermined gap cannot be reliably provided between the case and the top wall of the case.

  The present invention has been made to solve the above problems, and provides a circuit board case in which a case, a support part, and a connector outer part are integrally formed, and can prevent the connector outer part from falling down. The purpose is to do.

  In order to achieve the above object, a circuit board case according to a first aspect of the present invention has a concave shape surrounded by a bottom wall and a side wall, and stores a circuit board and an outer side from the outer surface of the bottom wall of the case. A portion extending from the outer surface of the support portion in a state of surrounding the radial periphery of the metal terminal and leaving a gap with respect to the outer surface of the bottom wall of the case. A circuit board case integrally formed with a protruding cylindrical connector exterior part, and of the outer side surface of the support part, on the opposite side outer surface located on the side opposite to the side where the connector exterior part is located A first reinforcing portion erected so as to connect a part of the case and an outer surface of the bottom wall of the case; and the first reinforcing portion and the opposite outer surface of the support portion With a gap between the opposite outer surface of the support and the case. It is formed in a substantially band-shaped connecting between the longitudinal end portion and the other end portion of the bottom outer surface of the wall and intersect border.

  According to a second aspect of the circuit board case of the present invention, in addition to the configuration of the first aspect of the invention, the first reinforcing portion is formed in a substantially arc shape.

  According to a third aspect of the present invention, there is provided a circuit board case between the inner surface of the first reinforcing portion and the outer surface on the opposite side of the supporting portion. Is provided with at least one first rib.

  In addition to the configuration of the invention according to any one of claims 1 to 3, the circuit board case of the invention according to claim 4 is configured such that when a direction away from the bottom wall of the case of the support portion is upward, Both ends in the longitudinal direction of the first reinforcing portion are formed in a tapered shape that is inclined obliquely upward toward the opposite outer surface of the support portion.

In addition to the configuration of the invention according to any one of claims 1 to 4, the circuit board case of the invention according to claim 5 is formed in a cylindrical shape and is formed inside the support part. A terminal connection portion having a connection hole for connecting an external terminal to the circuit board housed inside the case is integrally formed with the bottom wall of the case at a lower portion of the hole portion. A part of the inner surface of the support portion on the side where the connector exterior portion is located, when the direction away from the bottom wall of the case of the support portion to the outside of the case is upward. the between the upper portion of the terminal connecting portion, the second reinforcing portion having an inclined surface inclined obliquely upward previous SL plug tube portion toward the inner surface of the side located from the top of the terminal connecting portion Is provided.

In addition to the configuration of the invention according to claim 5, the circuit board case of the invention according to claim 6 is provided with at least one second rib on the inclined surface of the second reinforcing portion , At least a part of the second rib is connected to the inner surface of the support portion on the side where the connector exterior portion is located .

  In the circuit board case of the invention according to claim 1, even if the connector exterior part is cooled and contracted after the circuit board case having the case, the support part and the connector exterior part is integrally formed, the support part for supporting the connector exterior part is Since the first reinforcing portion is pulled to the side opposite to the connector exterior portion side, the connector exterior portion connected to the support portion can be prevented from falling toward the bottom wall side of the case. The first reinforcing portion is opposite to the support portion in a state where a gap is formed between the outer surface of the support portion and the opposite outer surface located opposite to the side where the connector exterior portion is located. Since it is provided in a substantially band shape connecting between the one end and the other end in the longitudinal direction of the boundary line where the side outer surface and the outer surface of the bottom wall of the case intersect, the support portion can be supported in a balanced manner, And compared with the case where the reinforcement part is intermittently provided in the outer surface on the opposite side of the support part, the connector exterior part can be reliably prevented from falling.

  Further, in the circuit board case of the invention according to claim 2, in addition to the effect of the invention of claim 1, since the first reinforcing part is formed in a substantially arc shape, the connector exterior part is on the bottom wall side of the case. It is possible to effectively relieve the stress that tends to fall. Therefore, even when the support portion is strongly pulled toward the connector exterior portion side, sufficient proof strength can be obtained to pull the support portion toward the opposite side.

  In addition to the effect of the invention according to claim 1, the circuit board case of the invention according to claim 3 has a first gap between the inner surface of the first reinforcing portion and the outer surface on the opposite side of the support portion. Therefore, the support part can be supported more strongly, and the fall of the connector exterior part can be more reliably prevented.

  In addition to the effect of the invention according to any one of claims 1 to 3, the circuit board case of the invention according to claim 4 has both longitudinal end portions of the first reinforcing portion gradually toward the support portion side. Therefore, the support portion can be pulled more strongly on the side opposite to the connector exterior portion side while suppressing the use of the material forming the first reinforcing portion. Furthermore, since the strength of the boundary portion between the support portion and both end portions of the first reinforcing portion can be improved, it is possible to prevent the support portion from being pulled and cracked at the boundary portion.

  In addition to the effect of the invention according to any one of claims 1 to 4, the circuit board case of the invention according to claim 5 has an inner surface on the side where the connector exterior portion of the support portion is located by the connector exterior portion. Even if it is pulled, the inner surface of the second reinforcing portion can be pulled to the side opposite to the connector exterior portion side. Thereby, it is possible to prevent the inner side surface of the support portion on the side where the connector outer portion is located from being bent and deformed while more reliably preventing the connector outer portion from falling toward the bottom wall side of the case. Furthermore, since the second reinforcing portion is gradually increased toward the inner surface of the support portion on the side where the connector exterior portion is located, the use of the material forming the second reinforcing portion is suppressed. The strength of the boundary portion between the inner side surface of the support portion where the connector exterior portion is located and the second reinforcing portion can be improved. Therefore, even if a load is applied to the boundary portion, it can be prevented from cracking.

According to a sixth aspect of the circuit board case of the present invention, in addition to the effect of the fifth aspect of the invention , at least a part of the second rib provided on the inclined surface of the second reinforcing portion is a support portion. Since the inner surface of the connector is connected to the inner surface on the side where the connector outer portion is located, the inner surface of the support portion on the side where the connector outer portion is located can be pulled. Therefore, the inner surface of the support portion on the side where the connector exterior portion is located can be pulled with good balance, and the connector exterior portion can be more reliably prevented from falling to the bottom wall side of the case.

  Hereinafter, a circuit board case 1 which is an embodiment of a circuit board case of the present invention will be described with reference to the drawings. 1 is a perspective view seen from the front side of the circuit board case 1, FIG. 2 is a perspective view seen from the front side of the storage case 2, and FIG. 3 is a perspective view seen from the upper side of the storage case 2. FIG. 4 is a perspective view of the protective cover 3 as viewed from the front side.

  In the following description, the left side of FIG. 1 is the front side of the circuit board case 1, the right side is the rear side of the circuit board case 1, the upper side is the upper side of the circuit board case 1, and the lower side is the lower side of the circuit board case 1. The front side of the paper surface is the right side of the circuit board case 1, and the deep side of the paper surface is the left side of the circuit board case 1. Furthermore, the direction of the storage case 2 shown in FIG. 2 and the protective cover 3 shown in FIG. 4 shall be the same as the direction of FIG.

  The circuit board case 1 of this embodiment is a sensor-side lead wire (not shown) connected to a connector of a gas sensor (not shown) and an electronic control unit (hereinafter referred to as “ECU”) that controls the automobile. A circuit board that electrically connects the ECU-side lead wire (not shown) connected to the) side and converts a detection signal output from the gas sensor in accordance with the gas concentration of the specific component into a concentration signal. (Not shown) is accommodated and attached to an attachment object such as under the floor of the vehicle. Examples of the gas sensor include an oxygen sensor for detecting the oxygen concentration in the exhaust gas, a full-range air-fuel ratio sensor, or a NOx sensor for detecting the NOx concentration in the exhaust gas.

  First, the configuration of the circuit board case 1 will be described. As shown in FIG. 1, the circuit board case 1 is formed in a substantially rectangular parallelepiped shape with an open bottom, and a resin storage case 2 (see FIG. 2) that stores the circuit board (not shown) inside. , And a metal protective cover 3 (see FIG. 4) that covers the storage case 2 (on the top wall 5 a side) and protects the storage case 2. Hereinafter, each component of the circuit board case 1 will be described in order.

  First, the storage case 2 will be described. As shown in FIGS. 2 and 3, the storage case 2 has a substantially rectangular parallelepiped case main body 5 having a predetermined bottom and an open bottom, and a substantially central portion of the outer surface of the top wall 5 a of the case main body 5. And a rectangular tube-shaped support portion 6 that supports a connector exterior portion 7 to be described later, and is substantially horizontal from the outer surface of the front wall 6a of the support portion 6 toward the front of the support portion 6. And a cylindrical connector exterior portion 7 that surrounds and protects a plurality of metal terminals 60 that are connected to the circuit board and project from the outer surface of the front wall 6 a of the support portion 6. And the storage case 2 which consists of the said structure is integrally formed with resin, and the case main body 5, the support part 6, and the connector exterior part 7 are mutually integrated.

  Next, the case body 5 will be described. As shown in FIGS. 2 and 3, the case main body 5 includes a top wall 5a, a front wall 5b, a right side wall 5c, a left side wall 5d, and a back wall 5e. A storage area (not shown) for installing the circuit board (not shown) and being filled with a resin filler is provided inside the case body 5. This filler is filled inside the case body 5 so as to be in contact with the inner surfaces of the top wall 5a, front wall 5b, right side wall 5c, left side wall 5d and back wall 5e of the case body 5, and is installed in the storage area. This is for sealing the circuit board thus formed in a watertight or airtight manner. The top wall 5a of the case body 5 corresponds to a “bottom wall” in the claims, and the front wall 5b, the right side wall 5c, the left side wall 5d, and the back wall 5e correspond to “side walls”.

  Further, the left and right side surfaces 5c and 5d excluding the front wall 5b and the back wall 5e of the case body 5 are provided on the front side of the case body 5 and on the rear side of the case body 5. 2 is provided (in FIG. 2, only a pair of locking portions 10 and 13 provided on the right side wall 5c of the case body 5 is shown).

  As shown in FIGS. 2 and 3, the locking portion 10 includes a support piece 11 that is a substantially rectangular flat plate extending downward from the upper portion of the right side wall 5 c of the case body 5, and the support piece 11. The engaging claw 11a is provided on the outer surface on the front end side of the piece 11 and protrudes in a convex shape toward the outside of the case body 5. Furthermore, the support piece 11 is accommodated on the case body 5 side in the portion of the right side wall 5c of the case body 5 that faces the back side of the support piece 11 (the surface on the side facing the right side wall 5c of the case body 5). A recess 12 that is recessed toward the inside of the case main body 5 is provided, and a predetermined gap is provided between the outer surface of the recess 12 and the support piece 11. The engaging claw 11a is provided so as to protrude outward from the recess 12.

  On the other hand, similarly to the locking portion 10, the locking portion 13 is a substantially rectangular flat plate extending downward from the upper portion of the right side wall 5 c of the case body 5, and the supporting piece 14. The engaging claw 14a is provided on the outer surface of the front end side and protrudes in a convex shape toward the outside of the case body 5. Further, the support piece 14 is accommodated on the case body 5 side in the portion of the right side wall 5c of the case body 5 that faces the back side of the support piece 14 (the surface on the side facing the right side wall 5c of the case body 5). A recess 15 that is recessed toward the inside of the case body 5 is provided, and a predetermined gap is provided between the outer surface of the recess 15 and the support piece 14. The engaging claw 14a is provided so as to protrude outward from the recess 15.

  When the protective cover 3 is attached to the storage case 2, these locking portions 10 and 13 are protected by the engagement claw 11 a of the locking portion 10 and the engagement claw 14 a of the locking portion 13, which will be described later. The cover 3 engages with the engagement holes 57 and 58 (see FIGS. 1 and 4). The pair of locking portions 10 and 13 is also provided on the left side wall 5d of the case body 5.

  Next, the support part 6 will be described. As shown in FIGS. 2 and 3, the support portion 6 is formed in a rectangular tube shape including a front wall 6 a, a right side wall 6 b, a left side wall 6 c, and a back wall 6 d, and is formed outside the top wall 5 a of the case body 5. It is erected at a predetermined height at a substantially central portion of the side surface. A hole 16 is provided inside the support 6. Further, as shown in FIG. 3, a terminal connection for inserting a terminal connected to a plurality of sensor-side lead wires connected to the connector of the gas sensor into the lower portion of the hole portion 16 to connect to the circuit board. Part 20 is provided. The terminal connection portion 20 penetrates in a direction orthogonal to the upper and lower surfaces of the terminal connection portion 20 and is connected to a through hole (not shown) of a circuit board (not shown) housed in the case body 5. A plurality of connection holes 21 are provided respectively. Further, between the left and right inner surfaces of the support portion 6 and the left and right outer surfaces of the terminal connection portion 20, insertion holes 35 and 35 each having a predetermined gap are provided.

  Further, as shown in FIG. 2, a protective portion 70 formed in a substantially U shape is inserted into the hole portion 16 of the support portion 6. The protection unit 70 covers and protects the terminal connection unit 20 (see FIG. 3) from above with the substantially U-shaped opening side facing downward. The protective portion 70 extends substantially horizontally, and includes a protective piece 71 serving as a main body of the protective portion 70, and leg portions 72, 72 extending at right angles from both longitudinal ends of the protective piece 71. It consists of and. Then, the pair of leg portions 72 and 72 of the protection portion 70 are respectively inserted into the insertion holes 35 and 35 (see FIG. 3) of the hole portion 16 of the support portion 6, so that the protection portion 70 is disposed above the terminal connection portion 20. The protective piece 71 can be arranged.

  Further, as shown in FIG. 3, a plurality of sensor-side lead wires drawn out from the terminal connection portion 20 toward the outside of the hole portion 16 are not entangled with each other at the upper end portion of the back wall 6 d of the support portion 6. A plurality of cut holes 18 for routing toward the rear of the support portion 6 are provided.

  On the other hand, as shown in FIG. 2, at the substantially central portion of the front wall 6 a of the support portion 6, the tip portions of a plurality of L-shaped metal terminals 60 connected to the circuit board housed in the case body 5 are provided. The front part 6 penetrates the front wall 6 a of the support part 6 and protrudes toward the front of the support part 6. And the several metal terminal 60 which protrudes from the outer surface of these front walls 6a is surrounded and protected by the connector exterior part 7 mentioned later.

  Further, as shown in FIG. 3, in the vicinity of the boundary line 9 between the lower portion of the back wall 6 d of the support portion 6 and the top wall 5 a of the case body 5, when the resin after the housing case 2 is integrally molded is shrunk. A belt-shaped first reinforcing portion 25 is provided to prevent the connector exterior portion 7 connected to the support portion 6 from falling toward the top wall 5a side of the case body 5. On the other hand, on the inner side surface of the front wall 6a in the hole 16 inside the support portion 6, like the first reinforcing portion 25, the front wall 6a of the support portion 6 is attached to the connector exterior during resin molding of the storage case 2. A triangular pillar-shaped second reinforcing portion 30 is provided to prevent falling down toward the portion 7 side. And these 1st reinforcement parts 25 and the 2nd reinforcement part 30 are the characteristics of this invention. Details of the first reinforcing portion 25 and the second reinforcing portion 30 will be described later.

  Next, the connector exterior part 7 will be described. As shown in FIGS. 2 and 3, the cylindrical connector exterior portion 7 is provided on the upper side of the front wall 6 a of the support portion 6 and extends substantially horizontally toward the front of the support portion 6. An opening 7 a for inserting a terminal (not shown) connected to the ECU-side lead wire and connecting to each of the metal terminals 60 is provided on the distal end side of the connector exterior portion 7.

  Further, a predetermined gap 8 is provided between the lower portion of the connector exterior portion 7 and the outer surface of the top wall 5 a of the case body 5. Thereby, for example, an ECU-side connector exterior portion (not shown) provided on the terminals of the plurality of ECU-side lead wires is fitted over the distal end side of the connector exterior portion 7. At this time, the lower part of the outer peripheral edge of the connector exterior portion can be inserted into the gap 8. Therefore, the terminal of the ECU-side lead wire can be reliably connected to the metal terminal 60 located inside the connector exterior portion 7. That is, a cylindrical ECU-side connector exterior portion (not shown) that surrounds the periphery in the radial direction of the terminal electrically connected to the ECU-side lead wire (not shown) is fitted into the connector exterior portion 7. Thus, the ECU side lead wire and the sensor side lead wire are electrically connected via the circuit board.

  Next, the protective cover 3 will be described. The protective cover 3 shown in FIG. 4 is attached so as to cover the upper part of the storage case 2 (see FIGS. 1 and 2), and protects the storage case 2 from external impacts (for example, stone splashes). The protective cover 3 has a bottom surface and a part of the top wall 50a opened, and is provided in a cover body 50 having a substantially rectangular parallelepiped shape with a shallow bottom, and an opening (not shown) of the top wall 50a of the cover body 50, A box-shaped roof 51 having a front surface and a bottom surface opened, and a back surface of the roof portion 51 and a back surface of the cover main body 50 are vertically cut and provided in a cut shape upward from a lower end portion of the cover main body 50. An insertion hole (not shown) for drawing out the plurality of sensor-side lead wires drawn out from the support portion 6 to the outside of the protective cover 3 and the inner periphery of the insertion hole toward the rear of the protective cover 3 The wiring cover 52 has a substantially inverted U-shaped cross section that extends substantially horizontally and covers and protects the plurality of sensor-side lead wires drawn out of the protective cover 3.

  Further, a bracket 54 having a substantially rectangular shape in plan view for attaching the protective cover 3 under the floor of the vehicle with the storage case 2 attached is provided on the front side of the cover main body 50 from the right side of the front lower end portion of the cover main body 50. A mounting hole 55 is formed in the substantially center of the bracket 54 through which a mounting bolt is inserted. On the other hand, a bracket (not shown) similar to the bracket 54 is also provided on the left side of the lower end of the back surface of the cover body 50 (right side toward the back surface of the cover body 50).

  Furthermore, a pair of engagement holes 57 and 58 having two rectangular shapes in front view are provided on the right side surface and the left side surface of the cover main body 50. When the protective cover 3 covers the storage case 2, the engagement holes 57 and 58 engage with the engagement claws 11 a and 14 a of the locking portions 10 and 13 provided in the case body 5 of the storage case 2. Are each locked.

  The roof portion 51 is for protecting the support portion 6 of the storage case 2 when the protective cover 3 covers the storage case 2, and the opening 51 a on the front surface of the roof portion 51 is stored in the storage portion 2. A plurality of ECU-side lead wires (not shown) connected to an ECU-side connector exterior portion (not shown) inserted and fixed in the connector exterior portion 7 of the case 2 are routed outside the protective cover 3. It is like that. The roof 51 may be omitted from the protective cover 3 depending on the mounting location of the circuit board case 1.

  Thus, the circuit board case 1 as shown in FIG. 1 can be obtained by arranging the storage case 2 and the protective cover 3 having the above-described configuration one above the other and attaching the protective cover 3 from above the storage case 2. Composed. And the storage case 2 is protected by attaching the lower side of the circuit board case 1 shown in FIG. 1 to the lower floor of the vehicle and attaching the two brackets 54 of the protective cover 3 to the lower floor of the vehicle by bolting. Thus, it can be attached to the vehicle side.

  Next, the 1st reinforcement part 25 and the 2nd reinforcement part 30 of the storage case 2 which are the characteristics of this invention are demonstrated. First, the 1st reinforcement part 25 is demonstrated. As shown in FIG. 3, the first reinforcing portion 25 is provided on the outer surface of the top wall 5 a of the case body 5, and is a boundary between the top wall 5 a of the case body 5 and the back wall 6 d of the support portion 6. The boundary line 9 is formed in a strip shape that connects one end portion and the other end portion in the longitudinal direction. The first reinforcing portion 25 includes a straight portion 26 extending in parallel to the outer surface of the back wall 6d at a predetermined interval from the back wall 6d of the support portion 6, and a longitudinal length of the straight portion 26. It is composed of taper portions 27 and 27 that extend from both ends of the direction inward to both ends of the boundary line 9 while drawing an arc, and incline obliquely upward toward the back wall 6 d of the support portion 6.

  And these taper parts 27 and 27 become a shape where thickness increases gradually toward the back wall 6d of the support part 6, and the uppermost part of the taper parts 27 and 27 is a little above the middle step of the back wall 6d. It is connected to the side. The first reinforcing portion 25 having the above shape is integrally formed with the storage case 2 and is connected to the back wall 6 d of the support portion 6 and the top wall 5 a of the case body 5.

  Further, between the straight portion 26 of the first reinforcing portion 25 and the back wall 6d of the support portion 6, three ribs 28, 28, 28 having a substantially right-angled triangular shape in side view support their hypotenuse side. In a state of being directed toward the rear of the part 6, the gaps are provided at substantially equal intervals. These ribs 28, 28, 28 are also integrally formed with the storage case 2, and the back wall 6 d of the support portion 6, the top wall 5 a of the case body 5, the first reinforcing portion 25 (specifically, the first reinforcing portion 25). To the straight part 26). In addition, the effect | action and effect of the 1st reinforcement part 25 which consists of the said structure are mentioned later.

  Next, the 2nd reinforcement part 30 is demonstrated. As shown in FIG. 3, the substantially triangular prism-shaped second reinforcing portion 30 is provided inside the support portion 6, and is provided between the front wall 6 a and the front side portion of the bottom portion of the support portion 6. The second reinforcing portion 30 includes an inclined surface 31 that is inclined obliquely upward from the front side portion of the bottom portion of the support portion 6 toward the inner surface of the front wall 6a. And the 2nd reinforcement part 30 which consists of the said shape is integrally molded with the storage case 2 (support part 6), and is connected with the front wall 6a of the support part 6, and the bottom part of the support part 6. FIG.

  Further, between the inclined surface 31 of the second reinforcing portion 30 and the inner side surface of the front wall 6a of the support portion 6, three ribs 32, 32, 32 having a substantially right-angled triangular shape in side view are on the oblique side. Are spaced apart from each other at substantially equal intervals. These ribs 32, 32, 32 are also integrally formed with the storage case 2 (support portion 6), and are connected to the front wall 6 a of the support portion 6 and the second reinforcing portion 30. The operation and effect of the second reinforcing portion 25 will be described later.

  Next, the operation and effect of the first reinforcing portion 25 during resin molding of the storage case 2 will be described. As shown in FIG. 3, the storage case 2 is made by pouring resin into a mold and solidifying it, so that the case main body 5, the support portion 6 and the connector exterior portion 7 described above are integrated with each other to form a single storage case 2. Is insert-molded together with a plurality of metal terminals 60. Then, the storage case 2 immediately after molding, which is pulled out from the mold, is gradually cooled to cause resin shrinkage. At this time, the base portion in the vicinity of the top wall 5a of the case body 5 in the support portion 6 tends to have a large degree of contraction because the volume thereof is larger than that of the other portions. However, there is a stress that tends to fall into the top wall 5 a side of the case body 5.

  However, in the circuit board case 1 of the present embodiment, since the first reinforcing portion 25 is provided on the back wall 6d side of the support portion 6, the support portion 6 is connected to the connector exterior portion 7 in an attempt to fall down. When pulled to the side, the tapered portions 27 of the first reinforcing portion 25 are pulled to the support portion 6 side, and the first reinforcing portion 25 is pulled. Since the 1st reinforcement part 25 is united with the top wall 5a of the case main body 5 at this time, the 1st reinforcement part 25 pulls the support part 6 toward the opposite side to the direction where the support part 6 is pulled. be able to. Furthermore, in the present embodiment, the first reinforcing portion 25 has the taper portions 27, 27 and the straight portion 26, and is connected to the back wall 6d of the support portion 6 in a substantially band shape. And the support part 6 can be supported firmly. Thereby, it can suppress that the support part 6 is pulled by the connector exterior part 7 side, and can prevent the fall of the connector exterior part 7 to the top wall 5a side of the case main body 5 by extension.

  Moreover, since the connection part of the straight part 26 and the taper parts 27 and 27 is each curving in an arc shape, when the support part 6 is pulled by the connector exterior part 7 side, it is stressed to the 1st reinforcement part 25 whole. Can be dispersed and relaxed, and a sufficient proof strength for pulling the support portion 6 with the entire first reinforcing portion 25 can be sufficiently obtained. Further, even when the support portion 6 is pulled more strongly toward the connector exterior portion 7 side, the support portion 6 can be pulled with the entire first reinforcing portion 25 through the three ribs 28, 28, 28. The entire support portion 6 can be pulled (supported) with a stronger force in a balanced manner. Further, at the time of contraction after resin molding, a large load is applied to the two connecting portions of the support portion 6 and the first reinforcing portion 25, but these connecting portions gradually become thicker toward the back wall 6d. Since the taper portions 27 and 27 are provided, it is possible to prevent cracks from occurring in the connecting portions.

  Next, the operation and effect of the second reinforcing portion 25 at the time of resin molding of the storage case 2 will be described. As shown in FIG. 3, similarly, due to the shrinkage of the storage case 2 after the resin molding, a stress that causes the connector exterior portion 7 to fall on the top wall 5 a side of the case body 5 occurs.

  Then, the 2nd reinforcement part 30 provided in the front wall 6a of the support part 6 is pulled by the connector exterior part 7 side via the front wall 6a. At this time, since the second reinforcing portion 30 is integrated with the bottom portion of the support portion 6, the second reinforcing portion 30 faces the front wall 6a of the support portion 6 toward the opposite side to the direction in which the support portion 6 is pulled. Can pull. Even when the upper portion of the front wall 6a of the support portion 6 is strongly pulled toward the connector exterior portion 7, the three ribs 32, 32, 32 respectively connected to the inclined surface 31 of the second reinforcing portion 30 The front wall 6a of the support portion 6 can be pulled rearward. Therefore, the entire front wall 6a of the support portion 6 can be pulled in a well-balanced manner, and the front wall 6a of the support portion 6 can be supported with a stronger proof stress.

  As described above, in the circuit board case 1 of the present embodiment, in the storage case 2, one end and the other end in the longitudinal direction of the boundary line 9 between the back wall 6 d of the support portion 6 and the top wall 5 a of the case body 5. The substantially 1st reinforcement part 25 of the substantially strip | belt shape which connects between parts is provided. The first reinforcing portion 25 is formed in a belt shape that is curved in an arc shape, and prevents the connector exterior portion 7 from falling toward the top wall 5a side of the case body 5 when the housing case 2 is resin-molded. Can do. On the other hand, the second reinforcing portion 30 is provided between the inner surface of the front wall 6 a inside the support portion 6 and the bottom portion of the support portion 6. The second reinforcing portion 30 prevents the front wall 6a of the support portion 6 from falling toward the connector exterior portion 7 when the housing case 2 is molded with resin, and the connector exterior portion 7 is connected to the case body. 5 can be prevented from falling to the top wall 5a side.

  Needless to say, the circuit board case of the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the number of the ribs 28 of the first reinforcing portion 25 in the above embodiment is three, but is not limited thereto, and may be more or less than three. A plurality of them are preferably provided. Further, the number of ribs 32 of the second reinforcing portion 30 is the same. Further, in the present embodiment, the filler filled inside the case body 5 is exposed to the outside, but the filler is not limited to the outside exposed, and a separately prepared plate-like lid is used. The lid may be fixed so as to be located on the opposite side of the top wall 5a of the case body 5 so as to cover the filler. In addition, when employ | adopting the structure which adheres a cover part to the case main body 5 in this way, a circuit board is watertight in the case main body 5 by fixing a cover part to the case main body 5 without using a filler. You may make it seal airtightly.

  Furthermore, in this embodiment, the terminal connection part 20 for connecting the terminal connected to the sensor side lead wire is provided inside the support part 6, but the side surface of the case body 5, the side surface of the support part 6, or the case A hole may be provided at a predetermined position of the top wall 5a of the main body 5, and a sensor-side lead wire may be routed through the hole so as to be electrically connected to the circuit board.

  The present invention can be applied to a circuit board case that houses a circuit board on which a control circuit such as a sensor control circuit or a heater control circuit is mounted.

2 is a perspective view of the circuit board case 1 as viewed from the front side. FIG. 3 is a perspective view of the storage case 2 as viewed from the front side. FIG. FIG. 4 is a perspective view seen from the upper side of the storage case 2. FIG. 4 is a perspective view of the protective cover 3 as viewed from the front side.

DESCRIPTION OF SYMBOLS 1 Circuit board case 2 Storage case 6 Support part 7 Connector exterior part 8 Gap 9 Boundary line 20 Terminal connection part 25 1st reinforcement part 27 Tapered part 28 Rib 30 2nd reinforcement part 31 Inclined surface 32 Rib 60 Metal terminal

Claims (6)

A concave shape surrounded by the bottom wall and the side wall, and a case for storing the circuit board,
A support portion extending outward from the outer surface of the bottom wall of the case;
A cylindrical connector exterior portion that surrounds the periphery of the metal terminal in the radial direction and that protrudes from a part of the outer surface of the support portion with a gap from the outer surface of the bottom wall of the case. A molded circuit board case,
A portion of the outer side surface of the support portion that is opposite to the side on which the connector exterior portion is positioned is connected to the outer side surface of the bottom wall of the case. A first reinforcing portion provided,
The first reinforcing portion intersects the opposite outer surface of the support portion and the outer surface of the bottom wall of the case with a gap between the opposite outer surface of the support portion. A circuit board case characterized by being formed in a substantially band shape connecting between one end and the other end in the longitudinal direction of the boundary line.   The circuit board case according to claim 1, wherein the first reinforcing portion is formed in a substantially arc shape.   The at least 1 or more 1st rib is provided between the inner surface of the said 1st reinforcement part, and the said other side outer surface of the said support part, The Claim 1 or 2 characterized by the above-mentioned. Circuit board case.   When the direction of the support portion away from the bottom wall of the case is the upper side, both longitudinal end portions of the first reinforcing portion are tapered obliquely upward toward the opposite outer side surface of the support portion. 4. The circuit board case according to claim 1, wherein the circuit board case is formed in a shape. The support part is formed in a cylindrical shape,
A terminal connection portion having a connection hole for connecting an external terminal to the circuit board housed inside the case is provided at a lower portion of the hole portion formed inside the support portion. Provided integrally with the bottom wall,
When the direction away from the bottom wall of the case of the case to the outside of the case is set upward, a part of the inner surface of the support portion on the side where the connector exterior portion is located, between the upper portion of the terminal connecting portion, the second reinforcing portion is provided with an inclined surface before Symbol plug tube portion from an upper portion of the terminal connecting portion is inclined obliquely upward toward the inner surface of the side located The circuit board case according to claim 1, wherein the circuit board case is provided. At least one second rib is provided on the inclined surface of the second reinforcing portion, and at least a part of the second rib is formed on the inner surface of the support portion and the connector exterior portion is The circuit board case according to claim 5, wherein the circuit board case is connected to an inner side surface on the side of the circuit board.

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