JP5773203B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box.

  Conventionally, for example, an electric connection box has been used as a module having a function of distributing and controlling electric power from a common power source to various vehicle electrical components in the vehicle. It contains electrical components. A relay described in Patent Document 1 below is known as a relay used in the electrical junction box having such a configuration.

JP 2010-108661 A

  The relay described in Patent Document 1 described above includes an electrical component case, a terminal portion accommodated in the electrical component case, a coil connected to the terminal portion, and an interior and exterior of the electrical component case separately from the terminal portion. And a metal plate arranged in an exposed form. According to such a configuration, the water vapor generated in the electrical component case due to the heat generation of the coil in the electrical component case can be actively condensed on the metal plate when the ambient environment temperature decreases, thereby Condensation to the contact of the terminal portion is suppressed to prevent contact conduction failure caused by icing of the condensation.

  However, the technique described in Patent Document 1 described above prevents contact continuity failure due to icing with respect to a single relay, and does not consider the influence of other electrical components housed in the electrical junction box. In other words, the electrical junction box contains a large number of various electrical components in addition to relays, and the timing of energization / non-energization varies depending on the influence of heat generated in these other electrical components and the type of electrical components. In some cases, the problem of contact continuity failure due to icing is likely to occur in the relay due to influences or the like.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to prevent malfunction of starting system electrical components.

An electrical junction box according to the present invention includes a casing mounted on a vehicle, and is accommodated in the casing and energized at least when the vehicle is started, and is accommodated in the electrical component case and the electrical component case and has a contact point A starting system electrical component having a terminal portion, an operating system electrical component housed in the casing and energized at least during operation of the vehicle, and between the starting system electrical component and the operating system electrical component A heat shield wall interposed in the casing, and the casing houses a circuit board having a circuit pattern on which the starting system electrical component and the operating system electrical component are mounted and connected to the terminal portion. The heat shield wall has a bottomed cylindrical shape opened to the circuit board side and is disposed so as to surround the starting system electrical component .

  In this way, when the vehicle is started, the starting system electrical component housed in the casing is energized to operate the vehicle, and during operation, the operating system electrical component housed in the casing is energized. Therefore, during operation of the vehicle, heat is generated from the operating system electrical components with energization. At this time, if heat from the operating system electrical component is transferred to the electrical component case of the starting system electrical component, the electrical component case of the starting system electrical component contacts the contact when the operation of the vehicle is stopped in a low temperature environment. Since the temperature is higher than the terminal part it has and a large temperature difference occurs, moisture present in the electrical component case is likely to condense and freeze on the contacts, causing the starting system electrical components to malfunction. There was a possibility.

  In this respect, in the present invention, since the heat shield wall is interposed between the operating system electrical component and the starting system electrical component, the heat from the operating system electrical component generated during the operation of the vehicle is generated by the starting system electrical component. It is difficult to transmit the product to the electrical component case, and the temperature rise of the electrical component case can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature environment, the temperature difference that can occur between the electrical component case of the starting system electrical component and the terminal portion having the contact can be reduced. As a result, it is difficult to cause a situation in which moisture present in the electrical component case is condensed on the contact point and freezes, so that it is possible to avoid a situation in which the starting system electrical component is not energized when the vehicle is started again. it can.

The above starting system electrical components are not limited to those that are energized only when the vehicle is started, but are energized when the vehicle is started and also when the vehicle is operating or when the vehicle is stopped. Is also included. In addition to the components that are always energized during operation of the vehicle, the operating system electrical components described above may be energized or de-energized during operation of the vehicle (eg, normally energized). In a state that is temporarily in a non-energized state, or in a normal state that is in a non-energized state but temporarily in a conductive state). Further, the operating system electrical components are not limited to those that are energized only during operation of the vehicle, but also include those that are energized during operation of the vehicle and energized when the operation of the vehicle is stopped.
In addition, since the terminal portion having the contact of the starting system electrical component is connected to the circuit pattern formed on the circuit board, the temperature decrease of the terminal portion tends to be promoted by the circuit pattern in a low temperature environment. As described above, the temperature increase of the electrical component case is suppressed by the heat shield wall, and the temperature difference that may occur between the electrical component case and the terminal portion having the contact is reduced, so that condensation and icing occur at the contact. Can be suitably prevented.
Further, since the starting system electrical component is arranged in a space surrounded by the bottomed cylindrical heat shield wall and the circuit substrate that is open to the circuit board side, there is almost no exposure to the operating system electrical component side. Or very little. As a result, heat from the operating system electrical component is more difficult to be transmitted to the electrical component case of the starting system electrical component, and the temperature rise of the electrical component case can be more suitably suppressed.
An electrical junction box according to the present invention includes a casing mounted on a vehicle, and is accommodated in the casing and energized at least when the vehicle is started, and is accommodated in the electrical component case and the electrical component case and has a contact point A starting system electrical component having a terminal portion, an operating system electrical component housed in the casing and energized at least during operation of the vehicle, and between the starting system electrical component and the operating system electrical component The starting system electrical component is disposed at a position relatively outside the operating system electrical component in the casing.
In this way, when the vehicle is started, the starting system electrical component housed in the casing is energized to operate the vehicle, and during operation, the operating system electrical component housed in the casing is energized. Therefore, during operation of the vehicle, heat is generated from the operating system electrical components with energization. At this time, if heat from the operating system electrical component is transferred to the electrical component case of the starting system electrical component, the electrical component case of the starting system electrical component contacts the contact when the operation of the vehicle is stopped in a low temperature environment. Since the temperature is higher than the terminal part it has and a large temperature difference occurs, moisture present in the electrical component case is likely to condense and freeze on the contacts, causing the starting system electrical components to malfunction. There was a possibility.
In this respect, in the present invention, since the heat shield wall is interposed between the operating system electrical component and the starting system electrical component, the heat from the operating system electrical component generated during the operation of the vehicle is generated by the starting system electrical component. It is difficult to transmit the product to the electrical component case, and the temperature rise of the electrical component case can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature environment, the temperature difference that can occur between the electrical component case of the starting system electrical component and the terminal portion having the contact can be reduced. As a result, it is difficult to cause a situation in which moisture present in the electrical component case is condensed on the contact point and freezes, so that it is possible to avoid a situation in which the starting system electrical component is not energized when the vehicle is started again. it can.
The above starting system electrical components are not limited to those that are energized only when the vehicle is started, but are energized when the vehicle is started and also when the vehicle is operating or when the vehicle is stopped. Is also included. In addition to the components that are always energized during operation of the vehicle, the operating system electrical components described above may be energized or de-energized during operation of the vehicle (eg, normally energized). In a state that is temporarily in a non-energized state, or in a normal state that is in a non-energized state but temporarily in a conductive state). Further, the operating system electrical components are not limited to those that are energized only during operation of the vehicle, but also include those that are energized during operation of the vehicle and energized when the operation of the vehicle is stopped.
Also, the outer position in the casing is more likely to escape to the outside than the inner position, so that the temperature drop of the electrical component case in the starting system electrical component can be further promoted in a low temperature environment. . Thereby, the temperature difference which may arise between an electrical component case and the terminal part which has a contact can be relieve | moderated more.
An electrical junction box according to the present invention includes a casing mounted on a vehicle, and is accommodated in the casing and energized at least when the vehicle is started, and is accommodated in the electrical component case and the electrical component case and has a contact point A starting system electrical component having a terminal portion, an operating system electrical component housed in the casing and energized at least during operation of the vehicle, and between the starting system electrical component and the operating system electrical component A heat shield wall interposed between the heat shield wall and the casing. The heat shield wall is formed integrally with the casing, and a connector portion is formed adjacent to the heat shield wall in the casing. A connector heat shield wall connecting portion that connects the heat shield wall and the connector portion is provided.
In this way, when the vehicle is started, the starting system electrical component housed in the casing is energized to operate the vehicle, and during operation, the operating system electrical component housed in the casing is energized. Therefore, during operation of the vehicle, heat is generated from the operating system electrical components with energization. At this time, if heat from the operating system electrical component is transferred to the electrical component case of the starting system electrical component, the electrical component case of the starting system electrical component contacts the contact when the operation of the vehicle is stopped in a low temperature environment. Since the temperature is higher than the terminal part it has and a large temperature difference occurs, moisture present in the electrical component case is likely to condense and freeze on the contacts, causing the starting system electrical components to malfunction. There was a possibility.
In this respect, in the present invention, since the heat shield wall is interposed between the operating system electrical component and the starting system electrical component, the heat from the operating system electrical component generated during the operation of the vehicle is generated by the starting system electrical component. It is difficult to transmit the product to the electrical component case, and the temperature rise of the electrical component case can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature environment, the temperature difference that can occur between the electrical component case of the starting system electrical component and the terminal portion having the contact can be reduced. As a result, it is difficult to cause a situation in which moisture present in the electrical component case is condensed on the contact point and freezes, so that it is possible to avoid a situation in which the starting system electrical component is not energized when the vehicle is started again. it can.
The above starting system electrical components are not limited to those that are energized only when the vehicle is started, but are energized when the vehicle is started and also when the vehicle is operating or when the vehicle is stopped. Is also included. In addition to the components that are always energized during operation of the vehicle, the operating system electrical components described above may be energized or de-energized during operation of the vehicle (eg, normally energized). In a state that is temporarily in a non-energized state, or in a normal state that is in a non-energized state but temporarily in a conductive state). Further, the operating system electrical components are not limited to those that are energized only during operation of the vehicle, but also include those that are energized during operation of the vehicle and energized when the operation of the vehicle is stopped.
Moreover, compared with the case where the heat shield wall is separated from the casing, it is suitable for reducing the manufacturing cost because the number of assembling steps can be reduced.
Moreover, the strength of the heat shield wall and the connector portion can be kept high by the connector heat shield wall connecting portion.

The following configuration is preferable as an embodiment of the present invention .

( 1 ) A plurality of the starting system electrical components are mounted on the circuit board, and a plurality of the heat shield walls are arranged so as to individually surround each of the starting system electrical components. In this way, a higher heat shielding effect can be obtained as compared with the case where a heat shielding wall is formed so as to surround a plurality of starting system electrical components collectively.

( 2 ) The plurality of heat shield walls are arranged adjacent to each other, and a connection portion between the heat shield walls that connects the adjacent heat shield walls is provided. If it does in this way, the intensity | strength of each heat shield wall can be kept high by the connection part between heat shield walls.

( 3 ) The starting system electrical component is disposed at an outer end position in the casing. In this way, the outer end position in the casing is a place where heat easily escapes to the outside in the casing. By arranging the starting system electrical components here, the temperature of the electrical component case in a low temperature environment can be obtained. The decrease can be further promoted, and the temperature difference that can occur between the electrical component case and the terminal portion having the contact can be further reduced.

( 4 ) The starting system electrical component is a relay, and the terminal portion includes at least a fixed contact as the contact and a movable contact that can be brought into contact with and separated from the fixed contact. In this way, it is possible to prevent moisture in the electrical component case from condensing and icing to either one or both of the fixed contact and the movable contact of the terminal portion by the above-described heat shield wall. When the vehicle is started again, the movable contact is satisfactorily brought into contact with the fixed contact, so that the switching function of the relay can be exhibited reliably.

  According to the present invention, it is possible to prevent malfunction of the starting system electrical component.

1 is an exploded perspective view of an electrical junction box according to Embodiment 1 of the present invention. Perspective view of electrical junction box Top view of electrical junction box Sectional view taken along line iv-iv in FIG. V-v sectional view of FIG. Vi-vi cross-sectional view of FIG. Side sectional view showing a schematic configuration of a relay provided in the electrical junction box Enlarged side sectional view of an electrical junction box according to Embodiment 2 of the present invention Enlarged plan view of electrical junction box Side sectional view which shows schematic structure of the relay which concerns on Embodiment 3 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The electrical connection box 10 of this embodiment is mounted and used in a vehicle (not shown). The electrical connection box 10 is attached between a battery (power source) (not shown) and various on-vehicle electrical components (not shown), and controls energization or disconnection (non-energization) of these on-vehicle electrical components. The electrical junction box 10 is used by being mounted in an engine room of a vehicle, for example. Specific examples of in-vehicle electrical components include various lamps (including headlights, brake lamps, hazard lamps (winker lamps), interior lights, etc.), air conditioners, power windows, power steering, power seats, horns, wipers, and defrosters. , Seat heater, starter, engine control unit (ECU), fuel pump, ignition (ignition device), and the like. In addition, a part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axial direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG.4 and FIG.5 be a front side, and let the lower side of the figure be a back side.

  As shown in FIG. 1, the electrical connection box 10 has a horizontally long rectangular shape as a whole, and includes a casing (housing, exterior body) 11, a first circuit board 12 accommodated in the casing 11, and a casing. 11 and a second circuit board 13 disposed so as to overlap the first circuit board 12. The electrical connection box 10 is a connector portion into which a mating connector (not shown) provided at the end of an electric wire (wire harness) electrically connected to the battery and the various on-vehicle electrical components described above is fitted and connected. A plurality of (operating system electrical components) 14 are provided. Furthermore, the electrical connection box 10 is provided with a plurality of fuse connection portions (operating system electrical components) 15 that receive a fuse (not shown) and can be connected to the fuse. These mating connectors and fuses are inserted into the electrical connection box 10 along the Z-axis direction from the front side. Moreover, the long side direction in this electrical junction box 10 corresponds to the X-axis direction shown in each drawing, the short side direction corresponds to the Y-axis direction, and the thickness direction corresponds to the Z-axis direction.

  The casing 11 is made of synthetic resin, and has a horizontally long rectangular shape as in the electrical junction box 10 as shown in FIG. The casing 11 is formed by assembling a pair of front and back (upper and lower pairs shown in FIG. 1) casing members 16 and 17, and the one disposed on the back side (lower side in the figure) is the first casing member (lower case) 16. On the other hand, the second casing member (upper case) 17 is arranged on the front side (upper side in the figure). In a state where the first casing member 16 and the second casing member 17 are assembled, a space having a predetermined width is secured inside, and the first circuit board 12 and the second circuit board 13 can be accommodated therein. . The assembling direction of both casing members 16 and 17 coincides with the Z-axis direction.

  As shown in FIG. 1, the first casing member 16 has a box shape that opens to the front side (the upward direction shown in FIG. 1) along the Z-axis direction, and the X-axis direction and the Y-axis direction (first circuit board). 12 plate surface) and an outer plate portion 16b that rises from the outer peripheral end of the bottom plate portion 16a toward the front side along the Z-axis direction and forms a substantially rectangular tube shape. It is said. On the bottom plate portion 16a of the first casing member 16, a large number of support protrusions 16c capable of supporting the first circuit board 12 from the back side are dispersedly arranged in the plane of the bottom plate portion 16a. Further, the bottom plate portion 16a is provided with a screw receiving portion 16d for tightening a screw for fixing the second casing member 17 in the attached state. As shown in FIG. 4, a lock portion 16e for holding both casing members 16, 17 in an assembled state is provided on the inner surface of the outer plate portion 16b. The lock portion 16e is formed in a claw shape at the leading end portion of the outer plate portion 16b, and a plurality of the lock portions 16e are arranged on each long side portion and each short side portion of the outer plate portion 16b.

  As shown in FIG. 1, the second casing member 17 has a substantially box shape opened to the back side (downward direction shown in FIG. 1) along the Z-axis direction, and roughly the bottom plate of the first casing member 16. A lid-like portion 17a that is opposed to the portion 16a and covers the first circuit board 12 and the second circuit board 13 from the front side, and rises from the outer peripheral end of the lid-like portion 17a toward the back side and is substantially The inner plate portion 17b has a rectangular tube shape. The lid portion 17a has a connector hood portion 17c that constitutes the connector portion 14 together with a connector terminal 18 mounted on the first circuit board 12 described later, and a fuse connection terminal 19 mounted on the first circuit board 12. A plurality of fuse mounting portions 17d constituting the fuse connecting portion 15 are provided. Most of the connector hood portion 17c and the fuse mounting portion 17d (specifically, all except the connector hood portion 17c arranged at the upper left corner shown in FIG. 3) are the center side in the long side direction of the lid-like portion 17a. It is arranged in a part. The connector hood portion 17c has a substantially rectangular tube shape that collectively surrounds the plurality of connector terminals 18 and opens toward the front side, so that the mating connector described above can be fitted from the front side. The fuse mounting portion 17d has a substantially rectangular tube shape that individually surrounds the plurality of fuse connection terminals 19 and opens toward the front side, and has a fuse mounting space in which the plurality of fuses described above can be individually mounted from the front side. Have more than one. Further, one end portion (upper right end portion shown in FIG. 1, right end portion shown in FIG. 3) in the long side direction of the lid-like portion 17a is more than the connector hood portion 17c and the fuse mounting portion 17d. A closed portion 17f is formed which is one step higher and does not have an opening. The closed circuit portion 17f can cover the second circuit board 13 over almost the entire area.

  The inner plate portion 17b can be fitted to the inner side with respect to the outer plate portion 16b of the first casing member 16, and as shown in FIGS. 2 and 4, when both the casings 16 and 17 are assembled, The outer plate 16b is surrounded over the entire circumference from the outside. On the outer surface of the inner plate portion 17b, there is provided a lock projection portion 17e that holds both the casing members 16 and 17 in an assembled state by being engaged with the lock portion 16e of the outer plate portion 16b. The lock protrusions 17e are configured to protrude from the outer surface of the inner plate portion 17b, and a plurality of lock protrusions 17e are arranged on each long side portion and each short side portion of the inner plate portion 17b.

  The first circuit board 12 is made of a synthetic resin, and as shown in FIG. 1, the first circuit board 12 extends along the plate surface of the bottom plate portion 16a of the first casing member 16 and has a horizontally long size that covers almost the entire area of the bottom plate portion 16a. The connector terminal 18 which comprises the connector part 14, the fuse connection terminal 19 which comprises the fuse mounting part 15, and a relay (starting system electrical equipment, operating system electrical equipment) A plurality of 20 are mounted. The first circuit board 12 has a circuit pattern (not shown) connected to the connector terminal 18, the fuse connection terminal 19, and the relay 20 so that the current supplied from the battery flows through this circuit pattern. It has become. The first circuit board 12 is a so-called power system circuit board that relays power supply from the battery to various in-vehicle electrical components, and the energization or disconnection of the first circuit board 12 can be controlled by the mounted relay 20.

  As shown in FIG. 1, the connector terminals 18 are arranged so as to protrude from the front side plate surface of the first circuit board 12 toward the front side, and have a tab shape. On the first circuit board 12, a plurality of connector terminals 18 are arranged in bundles in each region surrounded by each connector hood portion 16c. The fuse connection terminals 19 are arranged in a form protruding from the front side plate surface of the first circuit board 12 toward the front side, and have a tuning fork type in which a tip portion is branched in a bifurcated shape. A plurality of fuse connection terminals 19 are arranged on the first circuit board 12 so as to be individually arranged in the fuse mounting space of each fuse mounting portion 16d. As shown in FIGS. 1 and 3, most of the connector terminals 18 and the fuse connection terminals 19 (specifically, all except the connector terminals 18 arranged in the upper left corner shown in FIG. 3) are the first circuit board. 12 are arranged in a central portion in the long side direction.

  As shown in FIG. 1, the relay 20 is an electrical component for controlling whether or not the power supplied from the battery is supplied to the on-vehicle electrical component, and each of the relays 20 is a control target of energization or disconnection. A plurality of in-vehicle electrical components are provided. As the relay 20 is energized, the in-vehicle electrical components to be controlled are also in the energized state, whereas as the relay 20 is de-energized, the in-vehicle electrical components to be controlled are also disconnected. It becomes. As shown in FIGS. 1 and 3, the relays 20 are distributed and disposed at both end portions in the long side direction of the first circuit board 12, that is, at positions sandwiching the connector terminal 18 and the fuse connection terminal 19 described above. ing. Accordingly, in the first circuit board 12, the central side portion in the long side direction becomes an arrangement region for the connector terminal 18 and the fuse connection terminal 19, and both end portions in the long side direction become the arrangement region for the pair of relays 20. ing.

  Here, the detailed structure of the relay 20 will be described. As shown in FIGS. 1 and 7, the relay 20 includes a synthetic resin relay case (electrical component case) 20a, a metal terminal portion 20b partially protruding from the bottom of the relay case 20a, and a relay. The coil 20c accommodated in the case 20a is provided. The relay case 20a has a block shape that is elongated along the Z-axis direction as a whole, and has a receiving space for the terminal portion 20b and the coil 20c therein. The relay case 20a includes a base portion 20a1 having a bottom surface and a substantially bottomed cylindrical cover portion 20a2 that covers the base portion 20a1. Among them, a plurality of (six) vent holes 20a2a communicating with the external space are intermittently juxtaposed in the ceiling portion of the cover portion 20a2 (the portion facing the movable portion of the movable contact terminal portion 20b3 described below). Is formed. The vent hole 20a2a can release water vapor generated from the coil 20c to the outside when the coil generates heat, and can radiate heat from the internal terminal portion 20b and the coil 20c. The terminal portion 20b includes a pair of coil terminal portions 20b1 connected to both ends of the winding of the coil 20c in the relay case 20a, a fixed contact terminal portion 20b2 having a fixed contact FC, and a movable contact having a movable contact MC. The terminal portion 20b3. Among these, the movable contact terminal portion 20b3 has a movable portion that is cantilevered and can be elastically displaced by a magnetic field acting from the coil 20c, and is attached to the tip of the movable portion as the movable portion is displaced. The movable contact MC provided is configured to come into contact with and separate from the fixed contact FC of the fixed contact terminal portion 20b2. The movable contact terminal portion 20b3 includes a terminal body 20b3a having a movable portion and a contact member 20b3b having a movable contact MC. The former (terminal body 20b3a) has durability of a spring portion included in the movable portion. The latter (contact member 20b3b) is made of a metal material excellent in conductivity. A magnetic member 20d, which is a magnetic body, is attached to the movable portion of the terminal body 20b3a. The magnetic member 20d is made of a magnetic material such as iron, and is disposed between the movable part and the coil 20c, and displaces the movable part by electromagnetic induction from the coil 20c. Is possible. The relay 20 is in a non-contact state in which the fixed contact FC and the movable contact MC are separated from each other when no current is flowing through the coil 20c, and the relay 20 is connected to the fixed contact terminal portion 20b2 and the movable contact terminal portion 20b3. When a current is passed through the coil 20c through the coil terminal portion 20b1, the magnetic member 20d is attracted to the coil 20c side by the electromagnetic induction action from the coil 20c. When the contact terminal portion 20b3 is displaced and the movable contact MC is brought into contact with the fixed contact FC, the fixed contact terminal portion 20b2 and the movable contact terminal portion 20b3 are energized. That is, the relay 20 has a so-called a-contact structure. Of the terminal portions 20b1, 20b2, and 20b3, the portion protruding from the bottom surface of the relay case 20a is fixed to the first circuit board 12 by soldering and connected to the circuit pattern.

  By the way, the relay 20 includes a relay that has different energization timing depending on the on-vehicle electrical component to be controlled. Specifically, the relay 20 includes a start system relay 20A that is a start system electrical component that is energized when the vehicle is started. Two types of operation system relays 20B, which are operation system electrical components that are energized while the vehicle is operating, are included. Specifically, the start system relay 20A controls energization or disconnection of in-vehicle electrical components such as a starter, an engine control unit, a fuel pump, and an ignition. On the other hand, the operating relay 20B controls energization or disconnection of in-vehicle electrical components such as various lamps, air conditioners, power windows, power steering, power seats, horns, wipers, defrosters, seat heaters, and the like. Since the connector portion 14 (connector terminal 18) and the fuse connection portion 15 (fuse connection terminal 19) are energized while the vehicle is operating, both the operation system and the operation system relay 20B are the same. It can be said that it is an electrical component.

  The “starting system electrical component (starting system relay 20A)” is not limited to being energized only when the vehicle is started, but is energized when the vehicle is started and the operation of the vehicle or the operation of the vehicle is stopped. It also includes those that are energized even when they are turned on. In addition, the above-mentioned “operating system electrical components (operating system relay 20B, connector unit 14 and fuse connecting unit 15)” are energized during operation of the vehicle, in addition to those that are always energized during operation of the vehicle. Or those that are not energized (for example, those that are normally energized but temporarily de-energized, or those that are normally de-energized but temporarily energized) included. The “operating system electrical components” are not limited to those that are energized only during operation of the vehicle, but also include those that are energized during operation of the vehicle and energized even when the operation of the vehicle is stopped. .

  The second circuit board 13 is made of synthetic resin and has a vertically long plate shape parallel to the plate surface of the first circuit board 12 as shown in FIG. Is also getting smaller. The second circuit board 13 has a posture in which the long side direction coincides with the short side direction (Y-axis direction) of the first circuit board 12 and the short side direction coincides with the long side direction (X-axis direction) of the first circuit board 12. In the casing 11. The second circuit board 13 is unevenly arranged in the casing 11 at a position biased in the long side direction (X-axis direction). Specifically, one of the first circuit boards 12 in the long side direction is arranged. The end-side portion and the closed portion 17f of the lid-like portion 17a of the second casing member 17 are arranged at a position overlapping with the plan view. As shown in FIG. 4, the second circuit board 13 is disposed at a position spaced apart from the first circuit board 12 by a predetermined interval on the front side in the Z-axis direction. A space for accommodating the plurality of relays 20 is secured between the second circuit board 13 and the second circuit board 13. That is, the second circuit board 13 is arranged in such a manner that a plurality of relays 20 are sandwiched between the second circuit board 13 and the first circuit board 12. On the second circuit board 13, various electronic components (not shown) such as resistors, capacitors, transistors, and microcomputers are mounted, and circuit patterns (not shown) connected to the various electronic components are formed. .

  Furthermore, as shown in FIG. 1, one end side of the relay terminal portion 21 is mounted on the second circuit board 13, and the other end side of the relay terminal portion 21 is inserted into the first circuit board 12. The circuit patterns of both circuit boards 12 and 13 are relay-connected. The relay terminal portion 21 is formed by arranging a plurality of prismatic terminals linearly in parallel along the X-axis direction or the Y-axis direction. And a long side end located on the outer side (right side shown in FIG. 6) of the casing 11. Thus, the second circuit board 13 can control the operating state (energized or de-energized) of the relay 20 and the like mounted on the first circuit board 12 by various mounted electronic components. It can be said that it is a system circuit board.

  Now, in this embodiment, the arrangement of the relay 20 in the casing 11 is as follows according to the type. That is, among the relays 20, the start system relay 20 </ b> A is disposed at a position that is relatively outward in the casing 11 as shown in FIGS. 1 and 6, whereas the operating system relay 20 </ b> B is The casing 11 is disposed at a relatively inward position. In detail, the starting system relay 20A is divided into a plurality of parts on both ends of the casing 11 and the first circuit board 12 in the long side direction, thereby constituting two starting system relay groups 22 and 23. Of the two end portions in the long side direction, the first starting system relay group 22 is arranged in an end portion (left end side portion shown in FIG. 6) that does not overlap with the second circuit board 13 in plan view. The second starting system relay group 23 is arranged on the end side portion (the right end side portion shown in FIG. 6) that overlaps the second circuit board 13 when viewed in plan. On the other hand, the operating relay 20B includes a group of connector portions 14 and fuse connection portions 15 that are arranged in a plurality on the central side in the long side direction of the casing 11 and the first circuit board 12, respectively. A plurality of relays are arranged between the second starting system relay group 23. The operating system relay 20B is disposed adjacent to the group of the connector sections 14 and the fuse connection sections 15, and is an operating system electrical component as with the connector sections 14 and the fuse connection sections 15. Thus, the operating system electrical components are arranged in a concentrated manner on the central side portion of the first circuit board 12 in the long side direction. That is, it can be said that the central side portion in the long side direction of the first circuit board 12 is the operating system electrical component placement region, whereas the both end side portions are the starting system electrical component placement region.

  More specifically, as shown in FIG. 6, the start system relay 20 </ b> A constituting the first start system relay group 22 has a short side direction (Y-axis direction) at an end portion in the long side direction of the first circuit board 12. Two of them are arranged adjacent to each other in the Y-axis direction at a position sandwiching the connector portion 14 arranged on the center side, and are arranged at the end in the short side direction (the lower end shown in FIG. 6). One is arranged at a position adjacent to the center in the long side direction (X-axis direction) with respect to the one adjacent to the target, and the total is five. Among these, the four starting system relays 20A arranged at positions sandwiching the connector unit 14 are arranged at the outer end portion in the casing 11, and in particular, one corner portion of the casing 11 (shown in FIG. 6). It is included in the lower left corner). On the other hand, the start system relay 20A constituting the second start system relay group 23 is a relay terminal arranged on the center side in the short side direction in the end side portion (first space S1) in the long side direction of the first circuit board 12. One is arranged at a position sandwiching the section 21 and one is disposed at a position adjacent to the center in the long side direction with respect to the relay terminal section 21, for a total of three. Among these, the two start system relays 20A arranged at positions sandwiching the relay terminal portion 21 are arranged at the outer end portion in the casing 11, and in particular, two corner portions of the casing 11 (see FIG. 6). Upper right corner and lower right corner shown). Further, in addition to the five operating relays 20B being arranged along the Y axis direction between the pair of relay terminal portions 21 arranged at both ends in the short side direction of the first circuit board 12, One is arranged at a position shifted inward and outward in the long side direction with respect to what is arranged on the center side in the short side direction of the first circuit board 12. The seven operating system relays 20B are arranged at positions overlapping the second circuit board 13 in plan view together with the second starting system relay group 23, and the first circuit board 12, the second circuit board 13, and (Fig. 4).

  And in the electrical junction box 10 which concerns on this embodiment, as shown in FIGS. 4-6, while enclosing each starting system relay 20A which comprises the 1st starting system relay group 22, the connector part 14 and the fuse connection part 15 are included. Alternatively, a surrounding heat shield wall (heat shield wall) 24 interposed between the operating system relay 20B and the operating system relay 20B is provided. Specifically, the surrounding heat shield wall 24 is formed integrally with the lid-like portion 17a of the second casing member 17, and has a substantially bottomed rectangular tube shape that opens toward the back side, that is, the first circuit board 12 side. Yes. The surrounding heat shield wall 24 includes a ceiling wall portion 24a that is opposed to the first circuit board 12, and a substantially rectangular tube-shaped side wall portion that has a rectangular cross section and protrudes from the outer peripheral end of the ceiling wall portion 24a toward the back side. 24b, and can surround the outer peripheral surface excluding the bottom surface of the starting system relay 20A (the surface facing the first circuit board 12). Further, a part of the surrounding heat shield wall 24 (a portion facing the outer plate portion 16 b of the first casing member 16) also serves as the inner plate portion (outer peripheral wall portion) 17 b of the second casing member 17.

  As shown in FIGS. 4 and 5, the opening end portion of the surrounding heat shield wall 24 is in contact with or close to the plate surface of the first circuit board 12 when both casing members 16 and 17 are assembled. It is arranged to be a position. Therefore, in this state, the starting system relay 20A is held between the first circuit board 12 and the surrounding heat shield wall 24, and is accommodated in a closed space having almost no gap, and the outer peripheral surface is the first circuit. The substrate 12 and the surrounding heat shield wall 24 cover the almost entire area. The surrounding heat shield wall 24 is formed in a shape (individual enclosure type) that individually surrounds each of the starting system relays 20 </ b> A constituting the first starting system relay group 22, and the starting system that constitutes the first starting system relay group 22. The same number as the number of relays 20A (five in FIG. 6) is arranged. Accordingly, each starting system relay 20 </ b> A constituting the first starting system relay group 22 is individually housed in a mutually independent housing space held in each surrounding heat shield wall 24. In addition, among the starting system relays 20 </ b> A constituting the first starting system relay group 22, the heat shield walls 24 are arranged between the starting system relays 20 </ b> A adjacent on the first circuit board 12 in the X-axis direction or the Y-axis direction. Two side wall portions 24b are interposed.

  As shown in FIGS. 4 and 5, the adjacent surrounding heat shield walls 24 are connected to each other by a heat shield wall connecting portion 25. The connecting portions 25 between the heat shield walls connect the opposing portions of the side wall portions 24b of the adjacent surrounding heat shield walls 24, and the arrangement of the side wall portions 24b in the Z-axis direction is more than the side of the ceiling wall portion 24a. The position is on the opening end side. Further, as shown in FIG. 5, the surrounding heat shield wall 24 is connected to the connector hood portion 17 c forming the adjacent connector portion 14 by a connector heat shield wall connecting portion 26. The connector heat shield wall connecting portion 26 connects opposite portions of the side wall portion 24b of the surrounding heat shield wall 24 and the connector hood portion 17c, and the arrangement in the Z-axis direction is the heat shield wall connecting portion 25. It is almost the same. Further, as shown in FIG. 4, the surrounding heat shield wall 24 is connected to the fuse mounting portion 17 d forming the adjacent fuse connection portion 15 by the fuse connection portion heat shield wall connecting portion 27. The connecting portion 27 between the heat shield walls of the fuse connection portion connects the opposing portions of the side wall portion 24b of the surrounding heat shield wall 24 and the fuse mounting portion 17d, and the arrangement in the Z-axis direction is the connection between the heat shield walls. It is almost the same as the part 25.

  Furthermore, in the electrical junction box 10 according to the present embodiment, as shown in FIGS. 4 and 6, each starting relay 20 </ b> A constituting the second starting relay group 23 and the second starting relay group 23 are used. In addition, a partition heat shield wall (heat shield wall) 28 is provided between a plurality of operating relays 20B arranged adjacent to each other. The partition heat insulating wall 28 partitions the space held between the first circuit board 12 and the second circuit board 13 into an outer first space S1 and an inner second space S2 in the casing 11. Each starting system relay 20A constituting the second starting system relay group 23 is arranged in the first space S1, and a plurality of operating system relays 20B are arranged in the second space S2. The first space S1 includes an outer end portion in the long side direction in the casing 11, and particularly includes two corner portions in the outer end portion.

  Specifically, as shown in FIGS. 4 and 6, the partition heat shield wall 28 is a separate component from the circuit boards 12 and 13 and the casing members 16 and 17, and is separate from the first circuit board 12. It is attached. The partition heat shield wall 28 extends on the first circuit board 12 so as to cross the first circuit board 12 along the Y-axis direction while being bent in the middle when viewed in plan. The partition heat shield wall 28 crosses between the pair of relay terminal portions 21 arranged at both ends in the short side direction of the first circuit board 12, and extends outward in the long side direction of the first circuit board 12 on the way. It is bent to meander. The partition heat shield wall 28 surrounds the second space S2 together with the first circuit board 12, the second circuit board 13, and the pair of relay terminal portions 21 and is kept closed. On the other hand, the partition heat shield wall 28 opens the first space S1 on the opposite side to the second space S2 side, that is, outward in the long side direction (X-axis direction) of the casing 11, and the first space S1. It is configured to open outward in the direction perpendicular to (intersect) the arrangement direction of S1 and second space S2, that is, in the short side direction (Y-axis direction) of casing 11. That is, the partition heat shield wall 28 opens the first space S1 outward of the casing 11 in three directions excluding the second space S2 side.

  As shown in FIGS. 4 and 6, the partition heat shield wall 28 has pedestal portions 28 a each extending along the plate surface of the first circuit board 12 at the bottoms at both ends in the Y-axis direction. A vertical reinforcing rib 29 is provided to connect the wall surface of the pedestal portion 28 a and the wall surface of the partition heat shield wall 28. The pedestal portion 28a is formed in a range straddling the partition heat shield wall 28 in the plate thickness direction, and a pair of vertical reinforcing ribs 29 is provided for each pedestal portion 28a. As shown in FIG. 4, the vertical reinforcing rib 29 has a substantially triangular shape when viewed from the side. As shown in FIG. 6, the partition heat shield wall 28 has four bent portions bent substantially at right angles in the middle, and is provided with horizontal reinforcing ribs 30 that connect the wall surfaces at each bent portion. Yes. The horizontal reinforcing rib 30 has a substantially right-angled triangular shape when seen in a plane, and two sides excluding the oblique sides are connected to the wall surface of the bent portion of the partition heat shield wall 28. Of the partition heat shield wall 28, the outermost wall of the casing 11 and the portion extending along the Y-axis direction is the center of the first circuit board 12 in the short side direction. It is set as the form extended along the relay terminal part 21 distribute | arranged to the side. Thus, when the relay terminal portion 21 is inserted into the first circuit substrate 12 in association with the assembly of the second circuit board 13, the relay terminal portion 21 is slidably brought into contact with the outer wall surface of the partition heat shield wall 28. This makes it possible to guide the insertion operation.

  This embodiment has the structure as described above, and the operation thereof will be described subsequently. When starting the vehicle, each start system relay mounted on the first circuit board 12 is transmitted by transmitting a predetermined signal from the second circuit board 13 to the first circuit board 12 via the relay terminal portion 21. 20A is energized. Then, when an on-vehicle electrical component (a starter, an engine control unit, a fuel pump, an ignition, etc.) to be controlled by each start system relay 20A is energized, the engine mounted on the vehicle is started and the vehicle is operated. It becomes possible. As a result, the vehicle is in operation, and a predetermined signal is transmitted from the second circuit board 13 to the first circuit board 12 via the relay terminal portion 21 in accordance with a user's operation. The relay 20B, the connector part 14, and the fuse connection part 15) are energized or de-energized. When the operation system relay 20B is energized, on-vehicle electrical components (various lamps, air conditioners, power windows, power steering, power seats, horns, wipers, defrosters, seat heaters, and the like) that are controlled objects are energized. Each operating system electrical component and each circuit board 12 and 13 generate heat with energization, and the amount of generated heat tends to be proportional to the total energization time and the energized current amount.

  At this time, when heat from each operating system electrical component (the operating system relay 20B, the connector portion 14, and the fuse connecting portion 15) is transmitted to the relay case 20a of the starting system relay 20A that is the starting system electrical component, the relay case 20a. There will be a temperature rise. Particularly, since each start system relay 20A forming the second start system relay group 23 is sandwiched between the first circuit board 12 and the second circuit board 13, the heat dissipation of the relay case 20a is not good. When heat from each operating system electrical component generated during operation of the vehicle is transmitted to the relay case 20a, heat is likely to be generated in the relay case 20a. On the other hand, when the operation of the vehicle is stopped by turning off the engine in a low temperature and high humidity environment, each terminal portion 20b having the fixed contact FC and the movable contact MC of the starting relay 20A forms a relay case 20a. It is made of a metal material having a higher thermal conductivity than that of the resin material, and further, since it is connected to the circuit pattern of the first circuit board 12 made of a metal material and a heat sink action occurs at a low temperature, the temperature decrease is accelerated. It is easy to be done. For this reason, the relay case 20a becomes relatively high temperature, the terminal portions 20b having the fixed contact FC and the movable contact MC become relatively low temperature, and a large temperature difference is likely to occur between the two 20a and 20b. Yes. In particular, the fixed contact terminal portion 20b2 having the fixed contact FC has a magnetic member 20d in which the movable contact terminal portion 20b3 having the movable contact MC is brought into contact with the coil 20c, and the temperature is increased by heat transfer from the coil 20c. Compared to tendencies, it tends to be colder. On the other hand, in the relay case 20a, moisture may be vaporized due to heat generated during energization, so that the fixed contact terminal portion 20b2 having the fixed contact FC and the relay case 20a as described above If a large temperature difference occurs between the two, the condensation tends to occur selectively at the fixed contact FC in the fixed contact terminal portion 20b2, and the condensation may freeze in a low temperature environment. Then, when trying to start the vehicle again, the fixed contact FC and the movable contact MC at the terminal portion 20b become inaccessible, the start system relay 20A becomes inoperable, and the engine can be started. There was a possibility of disappearing.

  In this regard, in this embodiment, as shown in FIGS. 4 to 6, the starting system relay 20 </ b> A and the operating system electrical components (the operating system relay 20 </ b> B, the connector unit 14, and the fuse connection unit 15) forming the first starting system relay group 22. ), The surrounding heat shield wall 24 is interposed, so that the heat from each operating system electrical component generated during the operation of the vehicle forms the first starting system relay group 22 relay of the starting system relay 20A It is difficult to transmit to the case 20a, and the temperature rise of the relay case 20a can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature and high humidity environment, the relay case 20a of the start system relay 20A forming the first start system relay group 22 and the fixed contact terminal portion 20b2 having the fixed contact FC The temperature difference that can occur during In particular, the surrounding heat shield wall 24 has a substantially bottomed rectangular tube shape opened to the first circuit board 12 side, and individually surrounds the starting system relays 20A forming the first starting system relay group 22. The starting system relay 20A is hardly exposed to the operating system electrical component side, so that a high heat shielding effect can be obtained and the temperature difference can be reduced more suitably. In addition, the start system relay 20A that forms the first start system relay group 22 includes one that is arranged outside the operating system electrical components in the casing 11 and arranged at the outer end portion. Since the thing arrange | positioned at the corner | angular part of the outer edge part in is included, the heat | fever which the relay case 20a of the starting system relay 20A has can be released to the exterior of the casing 11, and it is a low temperature environment. The temperature drop of the relay case 20a can be promoted, so that the temperature difference can be more suitably mitigated. As a result, it is difficult for moisture existing in the relay case 20a in the starting relay 20A constituting the first starting relay group 22 to condense and freeze on the fixed contact FC in the fixed contact terminal portion 20b2, and again. It is possible to avoid a situation in which the starting relay 20A is not energized when starting the vehicle.

  Furthermore, according to the present embodiment, as shown in FIGS. 4 and 6, the partition heat shield wall 28 is interposed between the starting system relay 20 </ b> A forming the second starting system relay group 23 and the operating system electrical components. Therefore, it is difficult to transfer heat from each operating system electrical component generated during operation of the vehicle to the relay case 20a of the starting system relay 20A forming the second starting system relay group 23. The temperature rise of case 20a can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature and high humidity environment, the relay case 20a of the start system relay 20A forming the second start system relay group 23 and the fixed contact terminal portion 20b2 having the fixed contact FC The temperature difference that can occur during In particular, the partition heat insulating wall 28 partitions the space between the first circuit board 12 and the second circuit board 13 into an outer first space S1 and an inner second space S2 in the casing 11. Since the starting system relay 20A forming the second starting system relay group 23 is arranged in the first space S1 and the operating system relay 20B as the operating system electrical equipment is arranged in the second space S2, the first space S1 Heat is easily dissipated to the outside from the relay case 20a of the starting system relay 20A constituting the second starting system relay group 23 arranged in the space S1, and thus the temperature difference can be moderated appropriately. Moreover, since the partition heat shield wall 28 opens the first space S1 to the outside of the casing 11 in three directions excluding the second space S2 side, the start system relays forming the second start system relay group 23 Heat from the 20A relay case 20a is more easily dissipated to the outside. In addition, the first space S1 includes an outer end portion in the casing 11, and further includes a corner portion that is the outer end portion, and the second start system relay group is included in the outer end portion and the corner portion. 23 is arranged, the heat from the relay case 20a is more easily dissipated to the outside. As a result, it is difficult for the moisture present in the relay case 20a in the starting relay 20A constituting the second starting relay group 23 to condense and freeze on the fixed contact FC in the fixed contact terminal portion 20b2. It is possible to avoid a situation in which the starting relay 20A is not energized when starting the vehicle.

  As described above, the electrical junction box 10 of the present embodiment includes a casing 11 mounted on the vehicle, and is energized at least when the vehicle is started while being accommodated in the casing 11, and has a relay case (electrical component case). ) A starting system relay (starting system electrical component) 20A having a terminal portion 20b (fixed contact terminal portion 20b2) accommodated in 20a and a relay case 20a and having a fixed contact FC, and accommodated in the casing 11 and at least of the vehicle Operation system electrical components (operation system relay 20B, connector portion 14 and fuse connection portion 15) energized during operation, start system relay 20A and operation system relay 20B which is operation system electrical components, connector portion 14 and fuse connection portion And an surrounding heat shield wall (heat shield wall) 24 interposed between at least one of the two.

  In this way, when the vehicle is started, the starting system relay 20A accommodated in the casing 11 is energized to operate the vehicle, and during operation, the operating system relay is an operating system electrical component accommodated in the casing 11. At least one of 20B, the connector part 14, and the fuse connection part 15 is energized. Therefore, during operation of the vehicle, heat is generated from at least one of the operation system relay 20B, the connector unit 14, and the fuse connection unit 15 which is an operation system electrical component with energization. At this time, when heat from at least one of the operating system relay 20B, the connector unit 14, and the fuse connection unit 15 that are operating system electrical components is transmitted to the relay case 20a of the starting system relay 20A, a low temperature environment When the operation of the vehicle is stopped below, the relay case 20a of the start system relay 20A is hotter than the terminal portion 20b having the fixed contact FC, and a large temperature difference is generated. The moisture present in the relay case 20a is likely to condense and freeze, which may cause the starter relay 20A to malfunction.

  In this respect, in the present embodiment, the surrounding heat shield wall 24 is interposed between at least one of the operating system relay 20B, which is an operating system electrical component, the connector unit 14, and the fuse connection unit 15 and the starting system relay 20A. Therefore, heat from at least one of the operating system relay 20B, the connector unit 14, and the fuse connecting unit 15 that is an operating system electrical component generated during operation of the vehicle is generated by the start system relay 20A. It becomes difficult to transmit to the relay case 20a, and the temperature rise of the relay case 20a can be suppressed. Therefore, even when the operation of the vehicle is stopped in a low temperature environment, a temperature difference that can be generated between the relay case 20a of the starting relay 20A and the terminal portion 20b having the fixed contact FC can be reduced. As a result, a situation in which moisture present in the relay case 20a condenses on the fixed contact FC and freezes is less likely to occur, so that the start relay 20A is not energized when the vehicle is started again. be able to.

  The starting relay 20A is not limited to being energized only when the vehicle is started, but is energized when the vehicle is started and also when the vehicle is operating or when the vehicle is stopped. Is also included. In addition to at least one of the operating system relay 20B, the connector section 14, and the fuse connection section 15 that are the above operating system electrical components, a vehicle other than one that is always energized during operation of the vehicle. Those that become energized or de-energized during operation (eg, those that are normally energized but temporarily de-energized, or those that are normally de-energized temporarily energized State). In addition, at least one of the operation system relay 20B, the connector unit 14, and the fuse connection unit 15, which are operation system electrical components, is not limited to one that is energized only during operation of the vehicle. Also included are those that are energized when the vehicle is energized and when the operation of the vehicle is stopped.

  The casing 11 is mounted with at least one of a start system relay 20A, an operation system relay 20B as an operation system electrical component, a connector unit 14, and a fuse connection unit 15 and is connected to the terminal unit 20b. A first circuit board (circuit board) 12 having a circuit pattern to be processed is accommodated. In this way, since the terminal portion 20b having the fixed contact FC of the starting system relay 20A is connected to the circuit pattern formed on the first circuit board 12, the terminal portion 20b of the terminal portion 20b is changed by the circuit pattern in a low temperature environment. Although the temperature decrease tends to be promoted, as described above, the temperature increase of the relay case 20a is suppressed by the surrounding heat shield wall 24 and may occur between the relay case 20a and the terminal portion 20b having the fixed contact FC. Since the temperature difference is relaxed, it is possible to suitably prevent condensation and icing from occurring at the fixed contact FC.

  Further, the surrounding heat shield wall 24 has a bottomed cylindrical shape opened to the first circuit board 12 side and is disposed so as to surround the starting system relay 20A. In this way, the start system relay 20A is arranged in a space surrounded by the surrounding heat shield wall 24 having a bottomed cylindrical shape opened to the first circuit board 12 and the first circuit board 12. The exposure to at least one of the operating relay 20B, the connector portion 14, and the fuse connecting portion 15 that are the operating system electrical components is almost eliminated or negligible. As a result, heat from at least one of the operating system relay 20B, which is the operating system electrical component, the connector unit 14, and the fuse connection unit 15 is more difficult to transfer to the relay case 20a of the starting system relay 20A. The temperature rise of the relay case 20a can be suppressed more suitably.

  In addition, a plurality of starting system relays 20A are mounted on the first circuit board 12, and a plurality of surrounding heat shield walls 24 are arranged so as to individually surround each starting system relay 20A. In this way, it is possible to obtain a higher heat shielding effect as compared with the case where the surrounding heat shielding wall is formed so as to collectively surround the plurality of starter relays 20A.

  Further, the plurality of surrounding heat shield walls 24 are arranged adjacent to each other, and a connection portion 25 between the heat shield walls that connects the adjacent surrounding heat shield walls 24 to each other is provided. If it does in this way, the intensity | strength of each surrounding heat insulation wall 24 can be kept high by the connection part 25 between heat insulation walls.

  Further, the start system relay 20 </ b> A is located at a position relatively outside of at least one of the operation system relay 20 </ b> B that is an operation system electrical component, the connector unit 14, and the fuse connection unit 15 in the casing 11. It is arranged. In this way, the outer position in the casing 11 is more likely to escape to the outside than the inner position, so that the temperature drop of the relay case 20a in the starter relay 20A can be further reduced in a low temperature environment. Can be promoted. Thereby, the temperature difference which may arise between the relay case 20a and the terminal part 20b which has the fixed contact FC can be relieve | moderated more.

  Further, the starting system relay 20 </ b> A is arranged at the outer end position in the casing 11. In this way, the outer end position in the casing 11 is a place where heat is particularly easily evacuated to the outside in the casing 11, so that the relay case 20a in a low-temperature environment can be provided by arranging the starting system relay 20A here. Therefore, the temperature difference that can occur between the relay case 20a and the terminal portion 20b having the fixed contact FC can be further alleviated.

  The surrounding heat shield wall 24 is formed integrally with the casing 11. If it does in this way, compared with the case where a thermal-insulation wall is set as a different body from the casing 11, it is suitable for reduction of manufacturing cost, such as reducing an assembly man-hour.

  The casing 11 is formed with a connector portion 14 at a position adjacent to the surrounding heat shield wall 24, and a connector heat shield wall connecting portion 26 for connecting the adjacent surrounding heat shield wall 24 and the connector portion 14 is provided. Is provided. If it does in this way, the intensity | strength of the surrounding thermal-insulation wall 24 and the connector part 14 can be kept high by the connection part 26 between connector thermal-insulation walls.

  The starting system electrical component is a starting system relay 20A, and the terminal portion 20b has at least a fixed contact FC as a contact and a movable contact MC that can be brought into contact with and separated from the fixed contact FC. By doing so, the surrounding heat shield wall 24 prevents the moisture in the relay case 20a from condensing and freezing on the fixed contact FC of the terminal portion 20b. In addition, the movable contact MC is satisfactorily brought into contact with the fixed contact FC, so that the switching function of the starting system relay 20A can be surely exhibited.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. 8 or FIG. In the second embodiment, the shape of the surrounding heat shield wall 124 is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the surrounding heat shield wall 124 according to the present embodiment is configured to collectively surround a plurality of starter relays 120 </ b> A (collective enclosure type), and the first circuit board 112. A plurality of starter relays 120A are housed in a space held between the two. Specifically, the surrounding heat shield wall 124 has a substantially bottomed rectangular tube shape having a size that collectively surrounds two starter relays 120A arranged adjacent to each other on the first circuit board 112. . The surrounding heat shield wall 124 protrudes from the outer peripheral end of the ceiling wall portion 124a toward the first circuit board 112 toward the first circuit board 112 when viewed in plan. In addition, the two starter relays 120A include a side wall portion 124b disposed so as to surround the outer surfaces excluding the opposing surfaces. Therefore, two adjacent start system relays 120 </ b> A are accommodated in a common space held between the surrounding heat shield wall 124 and the first circuit board 112. Also by the surrounding heat shield wall 124 having such a configuration, heat from the operating system electrical components can be sufficiently blocked, so that heat transfer to the start system relay 120A can be suppressed.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the relay 220 is changed in shape. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 10, the relay 220 is formed with a smaller number of air holes 220a2a than the above-described first embodiment in the cover 220a2 constituting the relay case 220a. Three vent holes 220a2a are formed side by side in the ceiling portion of the cover portion 220a2 (the portion facing the movable portion of the movable contact terminal portion 220b3 described below). The three vent holes 220a2a are arranged so as to be biased toward the base end portion (the end portion on the opposite side to the free end side having the movable contact MC) among the movable portions having a cantilever shape in the movable contact terminal portion 220b3. Yes.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the above-described embodiments, the case where the surrounding heat shield wall that surrounds the starting system relays forming the first starting system relay group is provided has been described. For example, adjacent to the first starting system relay group In the present invention, the surrounding heat shield wall is provided so as to surround the operating system electrical component (specifically, at least one of the operating system relay, the connector unit, and the fuse connecting unit). . In that case, it is possible to remove the surrounding heat shield wall that surrounds the starting system relays that form the first starting system relay group, but it surrounds both the starting system relays and the operating system electrical components that form the first starting system relay group. A heat shield wall may be provided.

  (2) In each of the above-described embodiments, the case where the surrounding heat shield wall is provided so as to surround the starting-system relay that forms the first starting-system relay group is shown. However, in each embodiment, the second starting-system relay group is operated. It is also possible to substitute with a partition heat shield wall provided for partitioning from the system electrical component group. In other words, a partition-type heat shield wall is provided in such a manner that the first start-up relay group placement area and the operation system electrical component group placement area are partitioned and do not surround the start-up relay. Are also included in the present invention. In this case, you may make it provide both said surrounding thermal-insulation wall and a division-type thermal-insulation wall.

  (3) In each of the above-described embodiments, the start system relays forming the first start system relay group are disposed at positions outside the operating system electrical components in the casing. The present invention includes one in which the starting system relay and the operating system electrical components that form the relay group are arranged at substantially the same distance from the center in the casing. Further, the present invention includes a case in which the start system relays forming the first start system relay group are arranged in a position inward of the operation system electrical components in the casing.

  (4) In each of the above-described embodiments, the start system relay that forms the first start system relay group is shown at the outer end position in the casing, but the start system relay that forms the first start system relay group It is also possible to adopt an arrangement configuration in which the casing is arranged at a position closer to the inner side than the outer end position. It is also possible to employ a configuration in which the start system relays forming the first start system relay group are not arranged at the corners in the casing.

  (5) In each of the above-described embodiments, the surrounding heat-insulating wall has a bottomed rectangular tube shape, but the specific shape of the surrounding heat-insulating wall can be changed as appropriate, for example, a bottomed cylindrical shape It is also possible to have a bottomed elliptical cylindrical shape.

  (6) In each of the above-described embodiments, the configuration in which the opening end of the surrounding heat shield wall reaches the position in contact with or close to the first circuit board is shown. The present invention also includes a configuration in which a predetermined gap is held between the opening end and the first circuit board, and the space in the surrounding heat shield wall communicates with the outside.

  (7) In each of the above-described embodiments, the case where the heat shield wall connecting portion that connects adjacent surrounding heat shield walls is provided is shown, but a part or all of the heat shield wall connecting portion is omitted. Is also possible. The same applies to the connector heat shield wall connecting portion.

  (8) In each of the embodiments described above, the surrounding heat shield wall is integrally formed with the second casing member. However, the surrounding heat shield wall is a separate component from the second casing member and the first circuit board. It is also possible to adopt a configuration that is attached to the first circuit board or the second casing.

  (9) In addition to the above-described embodiments, the number and arrangement of starter relays forming the first starter relay group can be changed as appropriate, and the number and arrangement of surrounding heat shield walls are accordingly changed. It is also possible to change.

  (10) In the above-described second embodiment, the case where the surrounding heat shield wall is provided so as to collectively surround two adjacent starting system relays has been described. However, three or more starting system relays are collectively surrounded. The present invention includes an enclosure heat shield wall.

  (11) In each of the above-described embodiments, the case where the partition heat shield wall interposed between the starting system relay forming the second starting system relay group and the operating system electrical component is provided is described. It is also possible to substitute a surrounding heat shield wall provided to surround the starting relays forming the first starting relay group. That is, the present invention includes an enclosure-type heat shield wall that surrounds the starting system relays forming the second starting system relay group. In this case, you may make it provide both the above-mentioned division | segmentation heat insulation wall and an enclosure type heat insulation wall. In addition, when providing the surrounding type heat shield wall, the configuration related to the surrounding heat shield wall surrounding the start system relay forming the first start system relay group described in the first embodiment is applied, and the second start For example, by providing a heat shield wall in a form (individual enclosure type) individually enclosing the start system relays forming the system relay group, or by applying the configuration related to the enclosure heat shield wall described in the second embodiment. A heat shield wall may be provided that collectively encloses a plurality of starter relays forming a group of system relays (collective enclosure type).

  (12) In addition to the above (11), the operating system electrical component adjacent to the second starting system relay group (specifically, at least one of the operating system relay, the connector unit, and the fuse connection unit) In the present invention, a surrounding heat shield wall is provided so as to surround the two). In that case, it is possible to remove the surrounding heat shield wall that surrounds the starting relays that form the second starting relay group, but surrounds both the starting relays and the operating electrical components that form the second starting relay group. A heat shield wall may be provided.

  (13) In each of the above-described embodiments, the partition heat shield wall has been shown to be configured to open at least the first space toward the side opposite to the second space side. However, the first space is defined as the first space. A partition heat-shielding wall may be provided that is opened in a direction that intersects the direction in which the first and second spaces are arranged, but is not opened on the side opposite to the second space side.

  (14) In each of the above-described embodiments, the partition heat insulating wall is attached to the first circuit board side. However, the present invention also includes the partition heat insulating wall attached to the second circuit board side. It is.

  (15) In each of the above-described embodiments, a configuration in which an operating relay as an operating system electrical component is sandwiched and disposed between the first circuit board and the second circuit board (second space) is shown. However, only the starting system relay is sandwiched between the first circuit board and the second circuit board, and the operation system relay may not be sandwiched.

  (16) In each of the above-described embodiments, a configuration in which an operating relay, which is an operating electrical component, is sandwiched and disposed between the first circuit board and the second circuit board (second space) is shown. However, it is also included in the present invention that an operation system electrical component other than the operation system relay (for example, a connector part or a fuse connection part) is disposed between the first circuit board and the second circuit board.

  (17) In each of the above-described embodiments, the start system relays forming the second start system relay group are arranged at positions outside the operating system electrical components in the casing. The present invention includes one in which the starting system relay and the operating system electrical components that form the relay group are arranged at substantially the same distance from the center in the casing. In addition, the present invention includes one in which the start system relays forming the second start system relay group are disposed in the casing at a position closer to the inside than the operating system electrical components.

  (18) In each of the above-described embodiments, the start system relays forming the second start system relay group are arranged at the outer end position in the casing, but the start system relays forming the second start system relay group are It is also possible to adopt an arrangement configuration in which the casing is arranged at a position closer to the inner side than the outer end position. It is also possible to adopt a configuration in which the start system relays forming the second start system relay group are not arranged at the corners in the casing.

  (19) In each of the above-described embodiments, the partition heat shield wall is configured to cross the first circuit board over almost the entire width. However, the partition heat shield wall is partially arranged on the first circuit board. It is also possible to adopt a configuration. In that case, it is possible to provide a plurality of partition heat shield walls (for example, the same number as the start system relays forming the second start system relay group).

  (20) In each of the above-described embodiments, the partition heat shield wall is shown to have a configuration in which the cross section cut along the plate surface of the first circuit board has a bent shape. What is made into the form which crosses a circuit board linearly is also contained in this invention.

  (21) In the above-described embodiments, the horizontal reinforcing ribs that connect the wall surfaces of the bent portions of the partition heat shield wall are provided. However, a part or all of the horizontal reinforcing ribs may be omitted. . The same applies to the vertical reinforcing rib.

  (22) In each of the above-described embodiments, the wall surface of the partition heat shield wall extends along the relay terminal portion and can be contacted. However, the wall surface of the partition heat shield wall is relayed. It is also possible to adopt a configuration that is separated from the terminal portion and cannot be contacted.

  (23) In each of the above-described embodiments, the second circuit board having the circuit pattern is arranged so as to sandwich the starting system relay that forms the second starting system relay group with the first circuit board. A configuration in which a plate-like member having no circuit pattern is arranged in place of the above-described second circuit board is also included in the present invention.

  (24) In addition to the above-described embodiments, the number and arrangement of the start system relays constituting the second start system relay group can be changed as appropriate, and the shape and arrangement of the partition heat shield walls can be changed accordingly. It is also possible to change.

  (25) In the electrical junction box described in each of the above-described embodiments, the installation posture in the vehicle matches any one of the X-axis direction, the Y-axis direction, and the Z-axis direction shown in each drawing with the vertical direction or the horizontal direction. The posture can be made to be. Moreover, it is also possible to install the electrical junction box in the vehicle in a posture in which any one of the X-axis direction, the Y-axis direction, and the Z-axis direction shown in each drawing is inclined with respect to the vertical direction or the horizontal direction.

  (26) In each of the above-described embodiments, the relay is exemplified as the starting system electrical component. However, the present invention is also applied to a case where a contact type electrical component having a contact at the terminal portion other than the relay is used as the starting system electrical component. Is possible. Further, the relay contact structure used as the starting system electrical component or the operating system electrical component may be a b contact structure or a c contact structure in addition to the a contact structure.

  (27) In each of the above-described embodiments, a relay having a configuration in which the fixed contact terminal portion having no magnetic member is likely to be lower in temperature than the movable contact terminal portion having the magnetic member in contact with the coil has been shown. However, for example, the present invention can be applied to a relay using a relay in which the movable contact terminal portion and the fixed contact terminal portion have the same temperature due to the influence of the external environment, in which case the movable contact and the fixed contact are applicable. Condensation and icing can be prevented. The present invention can also be applied to a relay using a relay in which the movable contact terminal portion is likely to be colder than the fixed contact terminal portion due to the influence of the external environment. Can be prevented.

  DESCRIPTION OF SYMBOLS 11 ... Casing, 12, 112 ... 1st circuit board (circuit board), 14 ... Connector part (operation system electrical equipment), 15 ... Fuse connection part (operation system electrical equipment), 20,220 ... Relay (starting system electrical equipment) , Operating system electrical components), 20A, 120A ... starting system relay (starting system electrical components), 20B ... operating system relay (operating system electrical components), 20a, 220a ... relay case (electrical component case), 20b ... terminal portion, 24, 124 ... Surrounding heat shield wall (heat shield wall), 25 ... Connection between heat shield walls, 26 ... Connector heat shield wall connection, FC ... Fixed contact (contact), MC ... Movable contact (contact)

Claims (7)

A casing mounted on the vehicle;
A starting system electrical component that is housed in the casing and energized at least when starting the vehicle, and has an electrical component case and a terminal portion that is accommodated in the electrical component case and has a contact point;
An operating system electrical component housed in the casing and energized at least during operation of the vehicle;
A heat shield wall interposed between the starting system electrical component and the working system electrical component ,
In the casing, a circuit board having a circuit pattern connected to the terminal portion is mounted while the starting system electrical component and the operation system electrical component are mounted,
The heat shield wall is an electric junction box that is formed in a bottomed cylindrical shape that opens to the circuit board side and that surrounds the starting system electrical component . A plurality of the starting system electrical components are mounted on the circuit board,
The electrical junction box according to claim 1 , wherein a plurality of the heat shield walls are arranged so as to individually surround each of the starting system electrical components . The plurality of heat shield walls are arranged next to each other,
The electrical junction box according to claim 2, further comprising a heat shield wall connecting portion that connects the adjacent heat shield walls . A casing mounted on the vehicle;
A starting system electrical component that is housed in the casing and energized at least when starting the vehicle, and has an electrical component case and a terminal portion that is accommodated in the electrical component case and has a contact point;
An operating system electrical component housed in the casing and energized at least during operation of the vehicle;
A heat shield wall interposed between the starting system electrical component and the working system electrical component,
The starting system electrical component is an electrical connection box disposed in a position relatively outside the operating system electrical component in the casing . The electrical junction box according to claim 4 , wherein the starting system electrical component is disposed at an outer end position in the casing . A casing mounted on the vehicle;
A starting system electrical component that is housed in the casing and energized at least when starting the vehicle, and has an electrical component case and a terminal portion that is accommodated in the electrical component case and has a contact point;
An operating system electrical component housed in the casing and energized at least during operation of the vehicle;
A heat shield wall interposed between the starting system electrical component and the working system electrical component,
The heat shield wall is integrally formed with the casing,
The casing is formed with a connector portion adjacent to the heat shield wall,
An electrical junction box provided with a connector heat shield wall connecting portion for connecting the adjacent heat shield walls and the connector portion . The starting system electrical component is a relay,
The said terminal part is an electrical junction box of any one of Claims 1-6 which has at least a stationary contact as a said contact, and a movable contact which can be contacted / separated with respect to the said stationary contact .

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