JP4589844B2 - 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 by the sensor detection unit according to the concentration of the specific gas component is sensor control 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 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, similarly to 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 that is 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, a connector for electrically connecting the circuit board and the outside (gas sensor, ECU), a cover for the housing case, and an attachment of the circuit board case. It is comprised from the protective cover provided with the bracket for attaching to a target body. In such a circuit board case, the circuit board is set in the storage case, and then the filling material is filled in the storage case. Thereby, the circuit board set in the storage case can be sealed watertight. And the said protective cover is attached to the storage case in which the circuit board was accommodated, and the bracket of a protective cover is attached on the flame | frame of a vehicle.

Therefore, various methods can be considered for fixing the storage case and the protective cover in such a circuit board case. However, in a general method of fixing the case and the lid, for example, between the lid body portion and the main body portion. A resin case that is configured, and by fitting a fitting hole provided in the side wall of the lid body portion with a fitting claw provided in the side wall on the case side, the lid body portion and the main body portion are coupled to each other. A resin case fitting structure for accommodating a printed circuit board in a resin case is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-326567

  However, the claw shown in the resin case fitting structure described in Patent Document 1 is simply provided on the outer surface of the side wall of the circuit board case formed of the protective cover and the case, and the claw is fitted. When the hole is provided in the side wall of the protective cover of the circuit board case, the nail may bend not only inward but also inward to the case when the nail engages with the hole. There was a problem in that stress at the time of engagement was directly applied to the inner filler, and the filler was cracked. If the filler is cracked, the watertightness and airtightness of the filler are lowered, and a liquid such as water may enter the case, causing an abnormality such as a short circuit in the circuit board.

  The present invention has been made to solve the above-described problems, and when a protective cover is attached so as to cover the bottom wall of the case, only the case side claw is deformed, and the circuit board in which the case side wall is not deformed. The purpose is to provide a case.

  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 first bottom wall and a first side wall, and stores a circuit board, and at least an inner surface of the case. The inside of the case so as to be in contact with the circuit board, and a concave material surrounded by the filling material for sealing the circuit board, the second bottom wall and the second side wall, and outside the first bottom wall of the case A circuit board case comprising a protective cover attached to the outside of the case so as to cover at least a part of a side surface with the second bottom wall, wherein the case is predetermined between the outer side surface of the first side wall. A support member connected to the first side wall with a gap therebetween, and an engaging claw provided on the support member and projecting outward, and the protective cover is provided on the second side wall. Engage with the engaging claw and fix itself to the case. It has an engaging hole to be.

  According to a second aspect of the present invention, there is provided the circuit board case according to the first aspect of the present invention, wherein the case is provided on a portion of the outer side surface of the first side wall of the case where the support member is disposed. A recess that is recessed inward is provided, and at least a part of a portion of the support member excluding the engagement claw is accommodated in the recess.

  The circuit board case according to a third aspect of the present invention is the circuit board case according to the first or second aspect, wherein the support member includes an end of the first side wall on the first bottom wall side of the case. Is connected to the opposite other end, and connected to the connection support at one end thereof, and a bent portion bent toward the bottom wall of the case, and the other end of the bent portion. And an abutting portion that abuts against the outer surface of the first side wall, and the engaging claw is provided in the bent portion, and the bent portion is a second portion of the protective cover. The inner surface of the side wall is elastically biased.

  In addition to the configuration of the invention according to claim 3, a part of the support member is in contact with the second bottom wall of the protective cover. At least a lower side surface of the engagement claw facing the connection support portion is in contact with an inner peripheral surface of the engagement hole.

  The circuit board case according to a fifth aspect of the present invention is the circuit board case according to the third or fourth aspect, wherein the contact portion is bent from the other end of the bent portion toward the connection support portion. Is formed.

  A circuit board case according to a sixth aspect of the present invention is the circuit board case according to any one of the first to fifth aspects, wherein the case is made of resin, while the protective cover is made of metal. Has been.

  A circuit board case according to a seventh aspect of the present invention has a concave shape surrounded by the first bottom wall and the first side wall, and is surrounded by the case for storing the circuit board, the second bottom wall, and the second side wall. A circuit board case having a concave shape and comprising a protective cover attached to the outside of the case so as to cover at least a part of the outer surface of the first bottom wall of the case with the second bottom wall, The protective cover is formed of a material different from each other, and the case is connected to the first side wall with a predetermined gap between the case and the outer surface of the first side wall, and the support member The protective cover includes an engagement hole for engaging the engagement claw with the second side wall and fixing the engagement claw to the case. The support member disassembles the case and the protective cover. Fragile portion that breakage is provided when an external force is applied in order.

  According to an eighth aspect of the present invention, in addition to the configuration of the seventh aspect of the invention, the circuit board case of the first side wall of the case includes a portion of the case on the portion where the support member is disposed. A recess that is recessed inward is provided, and at least a part of a portion of the support member excluding the engagement claw is accommodated in the recess.

  In the circuit board case according to the first aspect of the present invention, the support member provided with the engaging claw is connected to the first side wall with a predetermined gap between the support member and the outer surface of the first side wall of the case. Therefore, when the engagement claw on the case side is engaged with the engagement hole on the protective cover side, the support member bends in the gap, so that the load applied to the engagement claw is caused by the filler inside the case. Can be prevented directly. As a result, it is possible to prevent the filler inside the case from being cracked, to prevent the circuit board from being abnormal, and to ensure good protection of the circuit board by the filler.

  In addition to the effect of the invention according to claim 1, in the circuit board case of the invention according to claim 2, at least a part of the portion excluding the engaging claw of the support member is housed in the recess. When providing the support member with a predetermined gap between the case and the first side wall, the case can be provided without increasing the size. Thereby, a compact circuit board case can be obtained.

  In addition to the effect of the invention described in claim 1 or 2, the circuit board case of the invention according to claim 3 has an engagement claw on the case side engaged with the engagement hole on the protective cover side, When the protective cover is attached to the outside, the support member can be supported by two points of the connection support portion and the contact portion that contacts the outer surface of the first side wall of the case. As a result, the inner surface of the second side wall of the protective cover can be urged by the elastic force of the bent portion, so that it is possible to effectively prevent rattling in a direction substantially perpendicular to the mounting direction of the case and the protective cover. .

  In addition to the effect of the invention according to claim 3, the circuit board case of the invention according to claim 4 has an engagement claw on the case side engaged with the engagement hole on the protective cover side, and the circuit board case on the outside of the case. When the protective cover is attached, a part of the support member is in contact with the second bottom wall of the protective cover, and the lower side surface of the engagement claw facing at least the connection support part side is the inner peripheral surface of the engagement hole. Abut. Thereby, since the engaging claw of the support member comes into firm contact with the inner peripheral surface of the engaging hole, it is possible to effectively prevent rattling in the mounting direction of the case and the protective cover.

  Further, in the circuit board case of the invention according to claim 5, in addition to the effect of the invention of claim 3 or 4, the contact part is formed by bending from the other end of the bent part toward the connecting support part side. Therefore, the contact portion can be brought into contact with both the outer side surface of the first side wall and the outer side surface of the first side wall of the case.

  Furthermore, in the circuit board case of the invention according to claim 6, in addition to the effect of the invention of any one of claims 1 to 5, the case is made of resin and the protective cover is made of metal. By forming the case with resin, a case having a support member connected to the first side wall with a predetermined gap between the outer side surface of the first side wall can be easily and efficiently manufactured. In addition, when the protective cover is made of metal, it is possible to satisfactorily secure the protection capability against external impacts such as stepping stones of the resin case.

  In the circuit board case of the invention according to claim 7, since the case and the protective cover are formed of different materials, it is necessary to disassemble the case and the protective cover when disposing of the circuit board case when recycling. Therefore, by applying an external force to the support member having the engaging claw, the weak portion provided in the support member is broken, so that the case and the protective cover are quickly separated. Therefore, since the circuit board case can be easily disassembled into the case and the protective cover, the disassembly operation can be performed efficiently. In addition, when providing the weakened portion in the support member, the shape (design) of the support member is designed or adjusted so that when the external force is applied, stress concentration occurs in a specific portion of the support member and breakage occurs. It is only necessary to reduce the thickness of a part of the member or reduce the strength so that breakage occurs at that part.

  Further, in the circuit board case of the invention according to claim 8, in addition to the effect of the invention of claim 7, since at least a part of the portion excluding the engaging claw of the support member is accommodated in the recess, When providing the support member with a predetermined gap between the case and the first side wall, the case can be provided without increasing the size. Thereby, a compact circuit board case can be obtained. Moreover, since the recessed part is provided in the part by which the supporting member of the outer side surface of the 1st side wall of a case is arrange | positioned, the predetermined clearance gap provided between the supporting member and the outer side surface of the 1st side wall of the case is provided. It can be secured more widely. This makes it easy to put the tip of the tool into the gap and apply an external force directly to the support member, so that the disassembly work can be performed more efficiently. Furthermore, since this predetermined gap can be secured widely, a tool or the like for breaking the fragile portion of the support member can be easily inserted between the support member and the outer side surface of the first side wall of the case.

  Hereinafter, a circuit board case 1 which is a first embodiment of a circuit board case of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view seen from the front side of the circuit board case 1 according to the first embodiment, FIG. 2 is a perspective view seen from the front side of the storage case 2, and FIG. 4 is a perspective view seen from the upper side, FIG. 4 is a perspective view seen from the front side of the protective cover 3, and FIG. 5 is a partially enlarged perspective view showing the vicinity of the locking portion 14 of the storage case 2 shown in FIG. is there.

  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, the lower side is the lower side of the circuit board case 1, and the front side of the page. The side is the right side of the circuit board case 1 and the depth side of the paper 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 follow the direction of FIG.

Here, the circuit board case 1 of the first embodiment includes 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. And electrically connecting between the ECU side lead wire (not shown) connected to the side and converting the detection signal output from the gas sensor according to the gas concentration of the specific component into a concentration signal. A circuit board (not shown) on which at least a sensor control circuit is mounted is accommodated and attached to an attachment object such as a vehicle floor. When the protective cover 3 is attached so as to cover the top wall 5a of the storage case 2, only the support pieces 15 that support the engaging claws 18 on the storage case 2 side are deformed, and the side walls on both sides of the storage case 2 are deformed. This is characterized in that neither the right side wall 5c nor the left side wall 5d is deformed. 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, and a NO _x sensor for detecting the NO _x 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-made storage case 2 that houses the circuit board (not shown) inside, It is configured by a metal protective cover 3 that covers the upper part (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-like support portion 6 that supports a connector exterior portion 7 to be described later, and extends substantially horizontally from the front wall 6a of the support portion 6 toward the front of the support portion 6. The cylindrical connector exterior portion 7 is connected to the circuit board and surrounds and protects the plurality of metal terminals 80 protruding from the front wall 6 a of the support portion 6. And the storage case 2 which consists of such a structure is integrally formed with resin, and the case main body 5, the support part 6, and the connector exterior part 7 become a mutually continuous shape.

  Next, the case body 5 will be described in detail. 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. Inside the case main body 5, a circuit board (not shown) is installed, and a storage area (not shown) for filling with a resin filler is provided. 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 the “first 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 the “first side wall”. To do.

  Further, a pair of locking portions 14, 14 which are features of the present invention are provided on the outer side surfaces of the right side wall 5 c and the left side wall 5 d of the case body 5 (in FIG. 2, the right side of the case body 5 Only a pair of locking portions 14, 14 provided on the surface is shown). Then, engaging claws 18 and 18 (described later) of the pair of locking portions 14 and 14 are engaged holes 57 and 57 (FIG. 1, FIG. 1, respectively) provided in the right side wall 50c and the left side wall 50d of the protective cover 3 described later. The storage case 2 is attached to the inner side of the protective cover 3 by engaging with each other (see FIG. 4). The pair of locking portions 14, 14 will be described later.

  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 (see FIG. 2), a right side wall 6 b, a left side wall 6 c, and a back wall 6 d. It is erected at a predetermined height at a substantially central portion of the outer surface of the top wall 5a. A hole 16 is provided inside the support 6. Further, as shown in FIG. 3, a terminal connection portion 20 for inserting a terminal connected to the sensor-side lead wire connected to the connector of the gas sensor into the lower portion of the hole portion 16 for connection to the circuit board. Is provided. The terminal connecting portion 20 penetrates in a direction orthogonal to the upper and lower surfaces of the terminal connecting 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. 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. 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. Thus, a plurality of cut holes 22 for routing toward the rear of the support portion 6 are provided.

  On the other hand, as shown in FIG. 2, a plurality of L-shaped metals connected to through-holes (not shown) of a circuit board housed in the case body 5 are provided at the substantially central portion of the front wall 6a of the support portion 6. Each front end portion of the terminal 80 passes through the front wall 6 a of the support portion 6 and protrudes toward the front of the support portion 6. A plurality of metal terminals 80 protruding from the outer surface of the front wall 6a are surrounded and protected by a connector exterior portion 7 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 80 is provided on the distal end side of the connector exterior portion 7.

  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) surrounding terminals connected to the plurality of ECU side lead wires is fitted so as to cover 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 connected to the ECU-side lead wire can be reliably connected to the metal terminal 80 located inside the connector exterior portion 7. That is, by fitting a tubular ECU-side connector exterior portion (not shown) that surrounds the radial periphery of the terminal electrically connected to the ECU-side lead wire (not shown) into the connector exterior portion 7. 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. 1 or FIG. 4 is placed over the storage case 2 (see FIGS. 1 and 2) to protect the storage case 2 from external impacts (for example, stone splashes). Is. The protective cover 3 has a bottom surface and a part of the top wall 50a that are open, and is provided in a substantially rectangular parallelepiped cover body 50 having a shallow bottom, and an opening (not shown) of the top wall 50a of the cover body 50. And a box-shaped roof portion 51 having an open bottom surface, and a sensor-side lead wire (not shown) extending rearward from the back surface of the cover body 50 and the back surface of the roof portion 51 and drawn from the storage case 2 side. The wiring cover 53 has an inverted U-shaped cross section for drawing out to the outside of the protective cover 3.

  First, the cover body 50 will be described. As shown in FIG. 4, the cover main body 50 includes a top wall 50a, a front wall 50b, a right side wall 50c, a left side wall (not shown) and a back wall (not shown), and has a substantially rectangular parallelepiped shape having a predetermined height. Is formed. Further, on the right side of the lower end portion of the front wall 50b of the cover body 50, a bracket piece 31 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 as a protective cover. The bracket piece 31 is provided with a mounting hole 32 through which a mounting screw is inserted. Although not shown, a bracket piece (not shown) in which a mounting hole (not shown) is formed is also provided on the left side (right side toward the back wall 50e) of the rear lower end portion of the cover body 50. 4 corresponds to the “second bottom wall” in the claims, and the front wall 50b, the right side wall 50c, the left side wall 50d, and the back wall (not shown) are the “second side wall”. Is equivalent to.

  Further, as shown in FIG. 4, the right side wall 50c and the left side wall (not shown) of the cover main body 50 are provided with a pair of engagement holes 57, 57 having a rectangular shape in front view (in FIG. 4, in the right side wall 50c). Only the engagement holes 57 and 57 provided are shown). When the protective cover 3 covers the storage case 2, the engagement claws 18 and 18 of the pair of locking portions 14 and 14 of the storage case 2 are engaged with the pair of engagement holes 57 and 57, respectively. It comes to match.

  Next, the wiring cover 53 will be described. As shown in FIG. 4, the back surface of the roof portion 51 and the back wall 50 e of the cover main body 50 are vertically cut, provided in a cut shape upward from the lower end portion of the cover main body 50, and pulled out from the support portion 6. In addition, a plurality of sensor-side lead wires (not shown) are provided with lead-out ports (not shown) for drawing out the outside of the protective cover 3. A wiring cover 53 extends substantially horizontally from the inner peripheral edge of the drawer opening toward the rear of the protective cover 3. Further, a plurality of sensor-side lead wires (not shown) drawn outside the protective cover 3 are inserted inside the wiring cover 53, and an insertion hole 53a for covering and protecting the sensor-side lead wires is provided. Is provided.

  Next, the roof part 51 is demonstrated. As shown in FIG. 4, the roof portion 51 covers and protects the support portion 6 (see FIG. 2) of the storage case 2 when the protective cover 3 covers the storage case 2. As shown in FIG. 4, an opening 52 is provided in front of the roof portion 51, and the ECU-side connector exterior portion fixed to the opening 52 by being inserted into the connector exterior portion 7 of the storage case 2. A plurality of ECU-side lead wires (not shown) connected to (not shown) are routed.

  The storage case 2 having the above configuration and the protective cover 3 are arranged one above the other, and the protective cover 3 is attached to the storage case 2 so as to cover the protective case 3 from above the storage case 2. A circuit board case 1 as shown in FIG. Then, the lower side of the circuit board case 1 shown in FIG. 1 is opposed to the lower floor of the vehicle, and the two bracket pieces 31 of the protective cover 3 are attached to the lower floor of the vehicle with bolts to protect the storage case 2. The circuit board case 1 can be attached to the vehicle side while being protected by the cover 3.

  Next, the locking portion 14 that is a feature of the present invention will be described. Here, only the locking portion 14 of the right side wall 5c shown in FIGS. 2 and 5 will be described. As shown in FIG. 2 and FIG. 5, the locking portion 14 extends slightly downward from the upper portion of the outer side surface of the right side wall 5 c of the case body 5 to slightly below the middle stage of the storage case 2. The support piece 15 is a rectangular flat plate, and the engagement claw 18 is provided on the outer surface on the front end side of the support piece 15 and protrudes in a convex shape toward the outside of the case body 5. An upper surface of the engaging claw 18 is provided with an inclined surface 18a inclined obliquely in a direction away from the right side wall 5c of the case main body from the upper side to the lower side. Further, a parallel surface 18b is provided from the lowermost portion of the inclined surface 18a toward the lower portion of the engaging claw 18 and parallel to the right side wall 5c.

  Furthermore, a concave portion 23 that is recessed toward the inside of the case main body 5 is provided in a portion of the right side wall 5c of the case main body 5 that faces the back surface of the support piece 15, and the outer surface of the concave portion 23 and the support piece 15 are provided. Is provided with a predetermined gap. The predetermined gap is such that the support piece 15 of the locking portion 14 can be bent inward when the engaging claw 18 of the locking portion 14 is engaged with the engagement hole 57 of the protective cover 3. Has been adjusted. In the case body 5 of the first embodiment, as shown in FIG. 3, the support piece 15 is accommodated inside the recess 23, and the engaging claw 18 projects outward from the recess 23.

  Next, a method for engaging the engagement claw 18 of the locking portion 14 of the storage case 2 with the engagement hole 57 of the protective cover 3 will be described. Here, an engagement method in the locking portion 14 on the right side wall 5c side of the storage case 2 will be described. First, before attaching the protective cover 3 (see FIG. 4) to the storage case 2 (see FIG. 2), a circuit board (not shown) is installed in the storage area (not shown) of the storage case 2 shown in FIG. Thereafter, a resin filler (not shown) is filled. Thereby, the circuit board installed in the storage case 2 can be sealed. Thereafter, the protective cover 3 is attached to the storage case 2 filled with the filler.

  Next, the bottom surface side where the protective cover 3 opens is opposed to the outer surface of the top wall 5 a of the storage case 2. And the protective cover 3 is attached so that a part of the top wall 5a may be covered with the own top wall 50a. First, the storage case 2 is gradually inserted inside the protective cover 3. Further, the lower ends of the right side wall 50 c and the left side wall 50 d of the protective cover 3 abut against the inclined surface 18 a of each engagement claw 18. Then, the inner side surface of the lower end portion of the right side wall 50c of the protective cover 3 slides on the inclined surface of the inclined surface 18a. Then, the engaging claws 18 of each locking portion 14 are urged and moved toward the inside of the recess 23, so that the support piece 15 is gradually bent and deformed inside the recess 23 in accordance with the urging. . Since the support piece 15 is provided with a predetermined gap from the right side wall 5c, only the support piece 15 of the locking portion 14 is bent and deformed in the gap.

  Next, as the support piece 15 bends toward the inside of the recess 23, the lower end portions of the right side wall 50 c and the left side wall 50 d of the protective cover 3 gradually slide on the inclined surface 18 a of each locking claw 18. The storage case 2 is gradually inserted inside the protective cover 3. When the engagement hole 57 of the protective cover 3 faces the parallel surface 18b of the engagement claw 18, the engagement claw 18 falls into the engagement hole 57 and engages, and the support piece 5 is bent. Returning to the original state, the protective cover 3 is attached to the storage case 2. In this way, the engagement claw 18 of the locking portion 14 of the storage case 2 is engaged with the engagement hole 57 of the protective cover 3, and the protective cover 3 is attached to the storage case 2.

  Next, a method for disassembling the circuit board case 1 will be described. In the circuit board case 1 of the first embodiment, for example, the storage case 2 is molded from a resin (for example, PBT resin: polybutylene terephthalate), and the protective cover 3 is molded from a metal (for example, iron). At the time of disposal for recycling, the circuit board case 1 must be separated into the storage case 2 and the protective cover 3 and disassembled. Therefore, in the circuit board case 1 of the present embodiment, for example, a tool such as a screwdriver is provided in a gap between the support piece 15 of the locking portion 14 shown in FIG. 5 and the outer surface of the right side wall 5c (left side wall 5d). Can be broken by applying an external force directly to the support piece 15. As a result, the engaging claw 18 can be easily removed from the engaging hole 57 of the protective cover 3 shown in FIG. 1, so that the storage case 2 can be easily removed from the protective cover 3, and the circuit board case 1 can be easily disassembled. be able to.

  Further, as shown in FIG. 5, the support piece 15 is connected to the right side wall 5c (left side wall 5d) with a predetermined gap between the support piece 15 and the outer side surface of the right side wall 5c (left side wall 5d). The structure is such that an external force is easily applied to the support piece 15. Further, since the concave portion 23 is provided on the outer side surface of the right side wall 5c (left side wall 5d) facing the support piece 15, a predetermined distance between the support piece 15 and the outer side surface of the right side wall 5c (left side wall 5d). A wider gap can be secured. Thereby, since it becomes easy to insert the front-end | tip of tools, such as a driver, in the predetermined clearance gap, the breakage operation | work of the support piece 15 can be performed more efficiently.

  Note that this disassembly method can be applied to, for example, a circuit board case in which there is no roof portion and a protective cover having an opening in the top wall of the cover body is attached to the storage case 2. In this case, in a state where the protective cover is attached to the storage case 2, the support portion 6 of the storage case 2 protrudes outward from the opening of the cover body of the protective cover. By applying pressure so as to push out the support portion 6, pressure is applied to the support piece 15 of the locking portion 14, and the support piece 15 can be easily and instantaneously broken. Thereby, the circuit board case can be easily disassembled.

  As described above, in the circuit board case 1 of the first embodiment, there is a predetermined gap between the support piece 15 provided with the engaging claws 18 and the outer surface of the right side wall 5c (left side wall 5d) of the storage case 2. When the engagement claw 18 is engaged with the engagement hole 57, only the support piece 15 of the locking portion 14 is deformed within the clearance without deforming the right side wall 50c and the left side wall 50d. It can be bent and deformed. Thereby, the storage area (not shown) of the storage case 2 does not change, and it is possible to prevent stress from being applied directly to the filler filled in the storage area. Therefore, it is possible to prevent the filler from being cracked and to prevent the protection ability of the circuit board from being lowered.

  Further, when the circuit board case 1 is disassembled into the storage case 2 and the protective cover 3 when the circuit board case 1 is discarded, for example, the support piece 15 of the locking portion 14 is broken by applying an external force with a tool. Thus, the engaging claw 18 that has been engaged with the engaging hole 57 of the protective cover 3 can be easily removed from the engaging hole 57. Therefore, the storage case 2 can be easily removed from the protective cover 3, so that the circuit board case 1 can be efficiently disassembled during recycling.

  Next, the circuit board case 200 of 2nd Embodiment is demonstrated based on FIG. 6 thru | or FIG. 6 is a perspective view seen from the front side of the circuit board case 100 according to the second embodiment, FIG. 7 is a perspective view seen from the front side of the storage case 200, and FIG. 8 is a perspective view of the storage case 200. 9 is a perspective view seen from the upper side, FIG. 9 is a perspective view seen from the front side of the protective cover 300, and FIG. 10 is a partially enlarged perspective view showing the vicinity of the locking portion 140 of the storage case 200 shown in FIG. 11 is a partial vertical cross section near the locking portion 140 in the right side wall 150c of the case main body 150, and FIG. 12 is a perspective view showing a state where the protective cover 300 is attached from the upper side of the storage case 200. FIG. 13 is a partial longitudinal sectional view showing the vicinity of the locking portion 140 showing a state in which the engagement claw 145 of the locking portion 140 on the storage case 200 side is engaged with the engagement hole 570 on the protective cover 300 side.

  In the following description, the left side of FIG. 6 is the front side of the circuit board case 100, the right side is the rear side of the circuit board case 100, the upper side is the upper side of the circuit board case 100, the lower side is the lower side of the circuit board case 100, The side is the right side of the circuit board case 100, and the depth side in the drawing is the left side of the circuit board case 100. Furthermore, the direction of the storage case 200 shown in FIG. 7 and the protective cover 300 shown in FIG. 9 shall be the same as the direction of FIG.

  The circuit board case 100 according to the second embodiment is a modification of the circuit board case 1 according to the first embodiment, and is a locking portion 140 obtained by deforming the locking portion 14 of the storage case 2 shown in FIG. Is provided. And in addition to the point which can prevent that the filling material with which this storage case 200 was filled by this latching | locking part 140 arises, the rattling of the storage case 200 and the protective cover 300 can be suppressed effectively. It is characterized in that it can be done. Since the circuit board case 100 is based on the structure of the circuit board case 1 in the first embodiment described above, the configuration is the same as that of the circuit board case 1 in the first embodiment in the following description. The description of the portion will be omitted, and the description will focus on the locking portion 140 that is a feature of the present invention.

  First, the configuration of the circuit board case 100 will be described. As shown in FIG. 6, the circuit board case 100 is formed in a substantially rectangular parallelepiped shape with an open bottom, and a resin-made storage case 200 for storing the circuit board (not shown) inside, and the storage case 200. A metal protective cover 300 is attached to the storage case 200 so as to cover from the top wall 150a (see FIG. 7) and protects the storage case 200. Hereinafter, each component of the circuit board case 100 will be described in order.

  First, the storage case 200 will be described. As shown in FIGS. 7 and 8, the storage case 200 has a substantially rectangular parallelepiped case body 150 having an open bottom surface and having a pair of locking portions 140 and 140 on both side walls (the right side wall 150c and the left side wall 150d). A rectangular tube-like support portion 600 that is erected at a predetermined height at a substantially central portion of the outer surface of the top wall 150a of the case body 150 and supports a connector exterior portion 700, which will be described later, in front of itself, The plurality of metal terminals 80 (see FIG. 7) that extend substantially horizontally from the front wall of the support portion 600 toward the front of the support portion 600 and that are connected to the circuit board and protrude from the front wall of the support portion 600. And a cylindrical connector exterior portion 700 to be protected.

  Next, the case main body 150 will be described. As shown in FIGS. 7 and 8, the case body 150 includes a top wall 150a, a front wall 150b, a right side wall 150c, a left side wall 150d, and a back wall 150e. Inside the case main body 150, a storage area 190 (see FIG. 12) for storing a circuit board (not shown) and filled with a resin filler is provided. The filler is filled inside the case body 150 so as to be in contact with the inner surfaces of the top wall 150a, the front wall 150b, the right side wall 150c, the left side wall 150d, and the back wall 150e of the case body 150. Further, a pair of locking portions 140 and 140, which are features of the present invention, are respectively provided on the outer side surfaces of the right side wall 150c and the left side wall 150d (in FIG. 7, they are provided on the right side surface of the case body 5). Only a pair of locking portions 140 and 140 are shown). The locking portion 140 will be described later.

  Next, the protective cover 300 will be described. As shown in FIG. 9, the protective cover 300 is provided in a substantially rectangular parallelepiped cover body 500 in which a bottom surface and a part of the top wall 500 a are opened, and an opening (not shown) of the top wall 500 a of the cover body 500. A box-shaped roof portion 250 whose front and bottom surfaces are open, and a rear wall (not shown) of the cover body 500 and a back wall (not shown) of the roof portion 250 extending rearward, and the storage case 200 side. A sensor-side lead wire (not shown) drawn out from the wiring cover 530 having an inverted U-shaped cross section for drawing out the outside of the protective cover 300 is configured. Further, an opening 255 is provided in front of the roof 250, and the opening 255 is pulled out from an ECU-side connector exterior (not shown) that is inserted into and fixed to the connector exterior 700 of the storage case 200. An ECU-side lead wire (not shown) is routed outward.

  Next, the cover main body 500 will be described. As shown in FIG. 9, the cover main body 500 includes a top wall 500a, a front wall 500b, a right side wall 500c, a left side wall 500d, and a back wall (not shown), and is formed in a substantially rectangular parallelepiped shape having a predetermined height. ing. A bracket piece 310 is provided on the right side of the lower end portion of the front wall 500b of the cover body 500 so as to extend substantially horizontally from the lower end portion of the front wall 500b toward the front of the protective cover 300. A mounting hole 320 for inserting a mounting bolt is formed in the center. Although not shown, a bracket piece having a mounting hole is also provided on the left side of the lower end of the back wall (not shown) of the cover main body 500 (the right side of the cover main body 500 toward the back wall).

  Further, a pair of rectangular engagement holes 570 and 570 are respectively provided slightly above the middle of the right side wall 500c and the left side wall 500d of the cover body 500 (in FIG. 9, the engagement of the right side wall 500c). Only the joint holes 570 and 570 are shown) The engagement holes 570 and 570 have a pair of locking portions 140 provided on both side walls (the right side wall 150c and the left side wall 150d) of the storage case 200 shown in FIG. 140, engaging claws 145 and 145 are engaged with each other.

  Then, the storage case 200 having the above-described configuration and the protective cover 300 are arranged one above the other, and the protective cover 300 is attached so as to cover a part of the top wall 150a of the storage case 200 with the top wall 500a. As a result, a circuit board case 100 as shown in FIG. 6 is formed.

  Next, the locking portions 140 and 140 that are the features of the present invention will be described. Here, only the locking portion 140 provided on the right side wall 150c of the case main body 150 will be described. As shown in FIGS. 10 and 11, the locking portion 140 extends from the lower end portion of the outer side surface of the recess 230 described later on the right side wall 150 c of the case body 150, and the front end side is separated from the right side wall 150 c. A pair of elongated connection support portions 141 and 141 that are folded back obliquely upward and spaced apart from each other by a predetermined width, and one end portion of each of the pair of connection support portions 141 and 141 is connected to each end of the case main body 150. The arch part 143 bent in an arch shape toward the top wall 150a side and the other end part (upper end part) opposite to one end part (lower end part) of the arch part 143 are directed toward the connection support part 141 side. When the protective cover 300 is attached to the storage case 200, the contact portion 146 that contacts the right side wall 150c and the inner side surface of the top wall 500a of the protective cover 300 is formed. Provided substantially longitudinal outer surface of the central switch portion 143, and a engaging claw 145. aspect substantially trapezoidal shape protruding toward the opposite side to the right side wall 510c.

  Further, as shown in FIG. 11, the arch part 143 is inclined at a predetermined angle in a direction away from the right side wall 150c, so that the contact part 146 is a right side wall of the case main body 150 before the protective cover 300 is attached. It is separated from 150c. In the present embodiment, the inclination angle of the arch portion 143 is about 5 °. When the protective cover 300 is attached to the storage case 200, the arch portion 143 falls to the right side wall 150c side with the bent portions of the pair of connection support portions 141 and 141 as fulcrums, and the contact portion 146 The right side wall 150c of the main body 150 and the inner side surface of the top wall 500a of the protective cover 300 are in contact with each other. Note that the arch portion 143 shown in FIG. 11 corresponds to a “bent portion” in the claims.

  As shown in FIGS. 10 and 11, an inclined surface 145 a that is inclined obliquely in a direction away from the right side wall 150 c of the case main body 150 is provided on the upper portion of the engaging claw 145 from the upper side to the lower side. Yes. Further, a flat flat surface 145b extending downward from the lowermost portion of the inclined surface 145a is provided, and the lower portion of the engaging claw 145 extends in a direction substantially orthogonal to the longitudinal direction of the arch portion 143. A lower end surface 145c is provided.

  Further, in the abutting portion 146, the bending point of the arch portion 143 is in contact with the inner side surface of the top wall 500a of the protective cover 300 shown in FIG. 9 when the protective cover 300 is attached to the storage case 200. A first abutting portion 146a is provided, and when the protective cover 300 is attached to the storage case 200 from the first abutting portion 146a to the distal end portion, on the outer surface of the right side wall 150c of the case main body 150. A second abutting portion 146b that abuts is provided.

  On the other hand, a concave portion 230 that is recessed toward the inside of the case main body 150 is provided in a portion of the right side wall 150c of the case main body 150 that faces the back side of the arch portion 143. The outer surface of the concave portion 230 and the arch portion 143 are provided. A predetermined gap is provided between the inner surface and the inner surface. The predetermined gap causes the arch portion 143 of the locking portion 140 to bend inside the recess 230 when the engaging claw 145 of the locking portion 140 engages with the engagement hole 570 of the protective cover 300. It is adjusted to the extent that it can.

  Next, a method for engaging the engagement claw 145 of the locking portion 140 of the storage case 200 with the engagement hole 570 of the protective cover 300 will be described. Here, an engagement method between the engaging portion 140 on the right side wall 150c side of the storage case 200 and the engagement hole 570 provided in the right side wall 500c of the protective cover 300 will be described. First, before attaching the protective cover 300 shown in FIG. 9 to the storage case 200 shown in FIG. 7, a circuit board (not shown) is installed in the storage area 190 (see FIG. 12) of the storage case 200. Filler (not shown) is filled. Thereby, the circuit board installed in the storage area 190 can be sealed watertight or airtight.

  Next, the protective cover 300 is attached to the storage case 200 in which the storage material 190 is filled with the filler. First, as shown in FIG. 12, the bottom surface side where the protective cover 300 opens is disposed on the upper part of the storage case 200. And the protective cover 300 is attached so that a part of top wall 150a (refer FIG. 8) of the storage case 200 may be covered with the top wall 500a. At this time, the storage case 200 is gradually inserted inside the protective cover 300. Further, the lower end portion of the right side wall 500 c of the protective cover 300 abuts on the inclined surface of the inclined surface 145 a of each engaging claw 145. Then, the inner side surface of the lower end portion of the right side wall 500 c of the protective cover 300 slides on the inclined surface 145 a of the engaging claw 145. At this time, the arch part 143 of the locking part 140 is biased toward the right side wall 150c via the engagement claw 145. And the arch part 143 falls down toward the right side wall 150c side, bending gradually. The storage case 200 is further inserted inside the protective cover 300.

  Next, as shown in FIG. 13, the first contact portion 146a contacts the inner surface of the top wall 500a of the protective cover 300, and the second contact portion 146b contacts the outer surface of the recess 230 in the right side wall 150c. Touch. Further, when the protective cover 300 is further pushed toward the storage case 200 side, the arch portion 143 is bent toward the right side wall 150c side with the connection support portions 141 and 141 and the second contact portion 146b as fulcrums to be engaged. The engagement hole 570 of the right side wall 150c (left side wall 150d) of the protective cover 300 faces the flat surface 145b of the claw 145. Thus, the engaging claw 145 on the side of the storage case 200 falls into the engagement hole 570 of the protective cover 300 and engages, so that the protective cover 300 can be attached to the storage case 200.

  As described above, the arch portion 143 of the locking portion 140 is provided with a predetermined gap from the right side wall 150c, and only the arch portion 143 of the locking portion 140 is bent and deformed. Therefore, the size of the storage area 190 of the storage case 200 does not change, and the filler filled in the storage area 190 is not directly stressed, so that it is possible to prevent the filler from cracking.

  Next, the operation and effect of the locking portion 140 in a state where the protective cover 300 is covered on the storage case 200 will be described. As shown in FIG. 13, in a state where the protective cover 300 is attached to the storage case 200, the first contact portion 146 a of the contact portion 146 is in contact with the inner surface of the top wall 500 a of the protective cover 300. Further, the outer surface of the second contact portion 146 b is in contact with the outer surface of the recess 230 in the right side wall 150 c of the case body 150. At this time, the arch portion 143 is supported at two points by the first contact portion 146a and the second contact portion 146b, and a part of the outer surface of the arch portion 143 is the right side wall 500c of the protective cover 300. The protective cover 300 is elastically biased outward while in contact with the inner side surface (the inner side surface of the left side wall 500d). Thereby, rattling in a direction substantially perpendicular to the mounting direction of the storage case 200 and the protective cover 300 can be prevented.

  On the other hand, as shown in FIG. 13, in a state where the lower end surface 145 c of the engagement claw 145 is in contact with a part of the engagement hole 570 of the protective cover 300, the first contact portion 146 a is the top wall of the protective cover 300. Since it is in contact with the inner surface of 500a, the arch part 143 is also bent and deformed downward. Therefore, rattling in the direction along the mounting direction of the storage case 200 and the protective cover 300 can be prevented.

  Next, a method for disassembling the circuit board case 100 will be described. In the circuit board case 100 of the second embodiment, as in the first embodiment, for example, the storage case 200 is molded of resin (for example, PBT resin: polybutylene terephthalate), and the protective cover 300 is made of metal ( For example, when it is molded with iron, the circuit board case 100 must be separated into the storage case 200 and the protective cover 300 and disassembled when disposing for recycling. Therefore, in the circuit board case 100 of the present embodiment, as shown in FIG. 10, the pair of connection support portions 141 and 141 of the locking portion 140 are formed in an elongated shape, so that when the protective cover 300 is engaged, The connection support portions 141 and 141 have a property of being easily bent, and also have a property of a weak portion that is broken when a large external force is applied during disassembly.

  Thereby, for example, when the circuit board case 100 is disassembled, a tip of a tool such as a screwdriver is inserted into a gap between the pair of connection support pieces 141 and 141, and an external force is directly applied to the connection support pieces 141 and 141. The engagement claw 145 can be removed from the engagement hole 570 of the protective cover 300 shown in FIG. In addition to this, a tip of a tool such as a screwdriver is inserted between the pair of connection support pieces 141 and 141 and the recess 230, and an external force is directly applied to the connection support pieces 141 and 141 to break them. Also good. By such a method, the storage case 200 can be easily removed from the protective cover 300, and the circuit board case 100 can be easily disassembled.

  This disassembly method can also be applied to, for example, a circuit board case in which there is no roof portion and a protective cover having an opening in the top wall of the cover body is attached to the storage case 200. In this case, since the support portion 600 of the storage case 200 protrudes outward from the opening of the cover body of the protective cover, by pressing the support portion 600 of the storage case 200 while pushing the support cover 600 while fixing the protective cover, Pressure is applied to the pair of connection support portions 141 and 141 of the locking portion 140, and the connection support portions 141 and 141 can be easily and instantaneously broken. Thereby, the circuit board case can be easily disassembled.

  As described above, the circuit board case 100 of the second embodiment includes the locking portion 140 obtained by modifying the locking portion 14 of the first embodiment. In the locking portion 140, when the protective cover 300 is attached to the storage case 200, the arch portion 143 that is curved in an arc shape has an inner surface of the right side wall 150c of the protective cover 300 and an inner side of the left side wall 150d. Since it contacts the side surface and is biased outward, it is possible to prevent rattling in a direction substantially perpendicular to the mounting direction of the storage case 200 and the protective cover 300. The first contact portion 146 a of the contact portion 146 contacts the inner surface of the top wall 500 a of the protective cover 300, and the lower end surface 145 c of the engagement claw 145 is a part of the engagement hole 570 of the protective cover 300. Abut. As a result, rattling in the mounting direction of the storage case 200 and the protective cover 300 can also be prevented.

  Further, the connection support portions 141 and 141 are easily bent when the protective cover 300 is engaged, and also have a function as a weak portion that is broken when a large external force is applied during disassembly. Thereby, for example, when the circuit board case 100 is disassembled into the storage case 200 and the protective cover 300 when the circuit board case 100 is discarded for recycling, the pair of connection support parts 141 and 141 of the locking part 140 is used. By applying an external force with a tool or the like, the engaging claw 145 engaged with the engaging hole 570 of the protective cover 300 can be easily removed. Therefore, the storage case 200 can be easily removed from the protective cover 300, so that the circuit board case 100 can be efficiently disassembled during recycling.

  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, although the protective cover 3 of the first embodiment includes the roof portion 51, for example, the protective cover 3 can be applied to a protective cover in which the roof portion 51 is omitted. In addition, such a protective cover without a roof part functions as a bracket for attaching the storage case 2 to the vehicle weight side while covering a part of the ceiling wall 5a of the case body 5 with the ceiling wall 50a excluding the roof part. It is what has.

  Furthermore, in the first embodiment, the pair of locking portions 14 are provided on both side surfaces of the storage case 2, but the number of locking portions is not limited to a pair, and may be one or three or more. Furthermore, in the first embodiment, the engaging claw 18 protrudes outward from the recess 23 while the support piece 15 of the locking portion 14 is positioned in the recess 23 recessed toward the inside of the case body 5. Although the support piece 15 is inclined outward as it goes downward, a part of the support piece 15 is positioned in the recess 23, and the engaging claw 18 and the remaining part of the support piece 15 are removed from the recess 23. You may form the latching | locking part 14 so that it may protrude outside.

  Moreover, although the inclination angle of the arch part 143 of the latching | locking part 140 of 2nd Embodiment is 5 degrees, it can change not only in this but. Further, in the above embodiment, the filler filled in the case body 5 (1500) is exposed to the outside. However, the filler is not limited to the exposed state, and a plate-like lid prepared separately. The lid may be fixed to be located on the opposite side of the top wall 5a (150a) of the case body 5 (150) so as to cover the filler using the portion.

  The present invention is not limited to a gas sensor, and can be applied to various circuit board cases used for controlling in-vehicle electrical components such as a glow plug, a pressure sensor, and a temperature sensor.

It is the perspective view seen from the front side of the circuit board case 1 which is 1st Embodiment. 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. FIG. 3 is a partially enlarged perspective view showing the vicinity of a locking portion 14 of the storage case 2 shown in FIG. 2. It is the perspective view seen from the front side of the circuit board case 100 which is 2nd Embodiment. 4 is a perspective view of the storage case 200 as viewed from the front side. FIG. FIG. 5 is a perspective view of the storage case 200 as viewed from above. FIG. 5 is a perspective view of the protective cover 300 as viewed from the front side. FIG. 8 is a partially enlarged perspective view showing the vicinity of a locking portion 140 of the storage case 200 shown in FIG. 7. 4 is a partial vertical cross section in the vicinity of the locking portion 140 in the right side wall 150c of the case main body 150. FIG. 5 is a perspective view showing a state in which a protective cover 300 is attached from the upper side of the storage case 200. FIG. 6 is a partial longitudinal sectional view showing the vicinity of a locking portion 140 showing a state in which an engaging claw 145 of a locking portion 140 on the storage case 200 is engaged with an engagement hole 570 on the protective cover 300 side.

Explanation of symbols

1 Circuit board case 2 Storage case 3 Protective cover 5a Top wall (bottom wall)
5b Front wall (side wall)
5c Right side wall (side wall)
5d Left side wall (side wall)
5e Back wall (side wall)
15 Support piece (support part)
18 engaging claw 23 recess 50a top wall 50b front wall 50c right side wall 57 engaging hole 100 circuit board case 141 connection support part 143 arch part 145 engaging claw 146 contact part 150a top wall (bottom wall)
150b Front wall (side wall)
150c Right side wall (side wall)
150d Left side wall (side wall)
150e Back wall (side wall)
190 Storage area 200 Storage case 230 Recessed part 300 Protective cover 500a Top wall 500b Front wall 500c Right side wall

Claims (8)

A concave shape surrounded by the first bottom wall and the first side wall, and a case housing the circuit board, and filling the inside of the case so as to be in contact with at least the inner surface of the case, and sealing the circuit board And a recess surrounded by the second bottom wall and the second side wall, and on the outside of the case so as to cover at least a part of the outer surface of the first bottom wall of the case with the second bottom wall. A circuit board case comprising a protective cover to be attached,
The case is
A support member connected to the first side wall with a predetermined gap between the outer side surface of the first side wall;
An engagement claw provided on the support member and projecting outward,
The circuit board case, wherein the protective cover includes an engagement hole that engages with the engagement claw and fixes the protection cover to the case on the second side wall. A portion of the outer side surface of the first side wall of the case where the support member is disposed is provided with a recess that is recessed toward the inside of the case.
The circuit board case according to claim 1, wherein at least a part of a portion of the support member excluding the engagement claw is accommodated in the recess. The support member includes a connection support portion connected to the other end portion of the first side wall opposite to the one end portion on the first bottom wall side of the case, and one end of the connection member connected to the connection support portion. A bent portion that is bent on the bottom wall side of the case, and a contact portion that is connected to the other end of the bent portion and contacts the outer surface of the first side wall,
The said engaging claw is provided in the said bending part, The said bending part is urging | biasing the inner surface of the 2nd side wall of the said protective cover elastically, The Claim 1 or 2 characterized by the above-mentioned. Circuit board case.   A part of the support member is in contact with the second bottom wall of the protective cover, and at least a lower side surface of the engagement claw facing the connection support portion side is an inner peripheral surface of the engagement hole. The circuit board case according to claim 3, wherein the circuit board case is in contact.   5. The circuit board case according to claim 3, wherein the contact portion is formed to bend from the other end of the bent portion toward the connection support portion.   6. The circuit board case according to claim 1, wherein the case is made of resin, and the protective cover is made of metal. A concave shape surrounded by the first bottom wall and the first side wall, housing the circuit board, and a concave shape surrounded by the second bottom wall and the second side wall, the outer surface of the first bottom wall of the case A circuit board case comprising a protective cover attached to the outside of the case so as to cover at least a part thereof with the second bottom wall,
The case and the protective cover are formed of different materials,
The case is
A support member connected to the first side wall with a predetermined gap between the outer side surface of the first side wall;
An engagement claw provided on the support member and projecting outward,
The protective cover includes an engagement hole that engages with the engagement claw on the second side wall and fixes itself to the case.
A circuit board case, wherein the supporting member is provided with a weak portion that is broken when an external force is applied to disassemble the case and the protective cover. A portion of the outer side surface of the first side wall of the case where the support member is disposed is provided with a recess that is recessed toward the inside of the case.
The circuit board case according to claim 7, wherein at least a part of a portion of the support member excluding the engaging claws is accommodated in the concave portion.

Images