JP4582716B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box.

2. Description of the Related Art As an electrical connection box mounted on an automobile, there is a structure having a circuit structure housed in a case. The circuit structure includes a circuit board, a bus bar arranged along the back surface of the circuit board and having a terminal portion formed at an end thereof, and a switching member such as a relay mounted on the surface side of the circuit board. It is configured. The case has a substantially rectangular frame-shaped member that is arranged and fixed along the periphery of the circuit board, a cover that is assembled to the frame-shaped member so as to cover the circuit board from the front surface side, and a back surface of the circuit board A metal heat-dissipating plate which is fixed to the frame-shaped member and closes the opening on the back side of the frame-shaped member, and is attached to the frame-shaped member so as to be along one side thereof, and is arranged in parallel along one side of the frame-shaped member And a connector housing that accommodates the terminal fitting.
In addition, as an electrical connection box, there exist some which are disclosed by patent document 1. FIG.
JP 2003-164039 A

When the connector housing is assembled along one side of the frame-shaped member, a plurality of terminal fittings are accommodated in the connector housing in parallel. At this time, the connector housing is inclined with respect to one side of the frame-shaped member. The position of the terminal fitting in the connector housing is not uniform, and the mating state between the mating terminal and the terminal fitting in the connector housing is incorrect when the mating connector is fitted into the connector housing. There is concern.
The present invention has been completed based on the above-described circumstances, and an object thereof is to prevent the connector housing from being assembled in an unauthorized posture with respect to the frame-shaped member.

As a means for achieving the above object, the invention according to claim 1 is a case in which a circuit structure is accommodated in a case, and the case is assembled to the circuit structure so as to follow the periphery thereof. A frame-shaped member, and a connector housing assembled along one side of the frame-shaped member, and the circuit component includes a plurality of terminal fittings arranged in parallel along one side of the frame-shaped member. In the state where the connector housing is assembled to one side of the frame-shaped member, the plurality of terminal fittings are accommodated in parallel in the connector housing, and the frame-shaped member and the connector housing include the Whether the frame-shaped member of the connector housing is locked by the elastic lock piece that is elastically bent during the assembly process of the connector housing and the elastic lock piece that is elastically restored. Direction of the lock means comprising a lock portion for regulating the withdrawal, provided with a plurality at intervals in the length direction of one side of the frame-like member, the frame member is assembled the connector housing A plurality of protection portions having a plate shape extending in a cantilevered manner toward the opposite side are formed side by side in the length direction of one side of the frame-shaped member, and the adjacent protection portions A pair of edge portions located on the inner side in the length direction of one side of the frame-shaped member among the portions are provided with a pair of guide surfaces having a tapered shape in which the distance gradually decreases toward the front in the assembly direction of the connector housing The pair of guide surfaces are provided in a plurality of sets at intervals in the length direction of one side of the frame-shaped member, and the connector housing has a wall that rises toward the front in the assembly direction of the connector housing. Fitting The wall-shaped fitting portion has a plurality of large recesses opened to the front side in the assembly direction of the connector housing at a position corresponding to the protection portion in the length direction of one side of the frame-shaped member. The portions sandwiched between the adjacent large recesses are guided portions, and both the outer sides in the length direction of one side of the frame-shaped member of the guided portions. The side surface is formed in a tapered shape that gradually becomes narrower toward the direction of assembly of the connector housing, and a plurality of the guided portions are provided at intervals in the length direction of one side of the frame-shaped member. It is characterized by

According to a second aspect of the present invention, in the first aspect of the present invention, the elastic lock piece is disposed between the pair of guide surfaces formed on the adjacent protection portions, and the guided portion includes: A pair of ribs are formed by forming a small recess that is opened to the front side in the assembly direction of the connector housing at a position corresponding to the elastic lock piece, and the guided portion includes the small recess, And the pair of ribs form a bifurcated shape that can be fitted into a space between the elastic lock piece and the pair of guide surfaces .
According to a third aspect of the present invention , a circuit structural body is accommodated in a case, and the case is assembled to the circuit structural body so as to follow a peripheral edge of the circuit structural body. A connector housing assembled along one side of the frame-shaped member, and the circuit component includes a plurality of terminal fittings arranged in parallel along one side of the frame-shaped member. In a state of being assembled on one side of the member, the plurality of terminal fittings are accommodated in parallel in the connector housing, and the frame-shaped member and the connector housing are elastically bent in the process of assembling the connector housing. A lock portion that includes a lock portion and a lock portion that restricts the connector housing from being detached from the frame-like member by engaging the elastic lock piece that has been elastically restored. And a plurality of large recesses open to the opposite side of the connector housing in the direction of assembly of the connector housing. Are formed side by side in the length direction of one side of the frame-shaped member, and the portion sandwiched between the adjacent large concave portions is a guide portion, and the frame-shaped member of the guide portion Both outer side surfaces in the length direction of one side are formed in a tapered shape that gradually becomes wider toward the direction of assembly of the connector housing, and the guide portion is in the length direction of one side of the frame-shaped member The connector housing is provided with a protective portion arranged at intervals in the length direction of one side of the frame-like member at a position corresponding to the large recess. The frame-shaped portion of the protective portion that fits A pair of edge portions located on the inner side in the lengthwise direction of one side are provided with a pair of guided surfaces having a tapered shape in which the distance gradually increases toward the direction of assembly of the connector housing. The guided surface is characterized in that a plurality of sets are provided at intervals in the length direction of one side of the frame-shaped member .

According to a fourth aspect of the present invention, in the third aspect of the present invention, the elastic lock piece is disposed between the pair of guided surfaces formed in the adjacent protective portions, and the guide portion includes the A pair of ribs are formed by forming a small recess that is opened on the opposite side to the assembly direction of the connector housing at a position corresponding to the elastic lock piece, and the guide portion includes the small recess, and The pair of ribs is characterized by a bifurcated shape that can be fitted into a space between the elastic lock piece and the pair of guided surfaces .

The invention according to claim 5 is the one according to any one of claims 1 to 4 , wherein the elastic lock piece is configured to extend in a cantilevered manner, and at the side edge thereof. It is arrange | positioned between a pair of protection parts provided along, and has a characteristic in the base end part of the said elastic lock piece, and the said protection part being connected by the reinforcement part.

<Invention of Claim 1>
When the connector housing is assembled to the frame-shaped member in a correct posture, the lock state is established in which the elastic locking pieces and the lock portions are locked in all the locking means, but when the connector housing is assembled obliquely, Since any of the locking means is in an unlocked state where the elastic locking piece and the locking part are not locked, whether or not the connector housing is assembled in the correct posture is determined by whether or not all the locking means are in the locked state. Can know based on. Since the lock means has an elastic lock piece that elastically bends during the assembly process, whether or not the lock means is in a locked state depends on whether or not the elastic lock piece is elastically restored. Judgment can be made based on whether or not a sound is generated due to the stop operation.
Further, the connector housing is guided to a proper assembled state by fitting the guide surface and the guided portion. In addition, since the guide surface and the guided portion are provided in a plurality with a distance in the length direction of one side of the frame-like member, the inclination of the connector housing can be reliably prevented. Furthermore, since the guide portion and the guided portion are tapered, positioning at the initial stage of assembly is easy.

<Invention of Claim 2>
The elastic lock piece is protected from foreign matter interference and the like by being sandwiched between the protection portions. In addition, since the guided portion is adapted to be fitted using the space between the elastic lock piece and the protective portion, compared to the one providing a dedicated space for fitting the guided portion, The structure can be simplified.
<Invention of Claim 3>
The connector housing is guided to a proper assembled state by fitting the guide portion and the guided surface. In addition, since the guide portion and the guided surface are provided in a plurality with a distance in the length direction of one side of the frame-shaped member, the inclination of the connector housing can be reliably prevented. Furthermore, since the guide portion and the guided surface are tapered, alignment at the initial stage of assembly is easy.

<Invention of Claim 4 >
The elastic lock piece is protected from foreign matter interference and the like by being sandwiched between the protection portions. In addition, since the guide portion is adapted to be fitted using the space between the elastic lock piece and the protection portion, the structure of the structure is smaller than that provided with a dedicated space for fitting the guide portion. Simplification can be achieved.

<Invention of Claim 5 >
The elastic lock piece is protected from foreign matter interference and the like by being sandwiched between the protection portions. Further, since the base end portion of the elastic lock piece and the protection portion are connected by the reinforcing portion, the strength of the elastic lock piece is improved.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The electrical junction box of the present embodiment is mounted on an automobile, and is interposed between a battery (not shown) and electrical components (not shown) such as a lamp and an audio, and power supplied from the battery is supplied to each electrical equipment. In addition to distributing and supplying to the product, control such as switching of the power supply is performed.

The electrical junction box includes a circuit structure 10 and a case 20 that houses the circuit structure 10.
The circuit structure 10 includes a circuit board 11 having a substantially rectangular flat plate shape, a plurality of bus bars 12 arranged along the back surface of the circuit board 11 (the right surface in FIGS. 2 and 3), and the surface side of the circuit board 11. And a plurality of terminal fittings 14 attached to a fuse block 25 to be described later.

The case 20 has a substantially rectangular frame-shaped member 21, a synthetic resin cover 22 assembled so as to close the opening on the front surface side of the frame-shaped member 21, and an opening on the back surface side of the frame-shaped member 21. It is comprised from the metal heat sink 23 assembled | attached so that it may block.
The frame-shaped member 21 includes a frame 24 made of a synthetic resin having a substantially rectangular frame shape arranged so as to continuously surround the entire circumference of the circuit structure 10 along the periphery of the circuit board 11, and the frame 24. In contrast, a synthetic resin fuse block 25 having a gate shape assembled along the upper side edge and the left and right side edges, and a synthetic resin upper housing 26 assembled to the fuse block 25 (which is a constituent element of the present invention). Connector housing) and a synthetic resin lower housing 27 assembled to the lower edge of the frame 24.

  In the fuse block 25, a main body portion 28 (one side of the frame-shaped member 21 which is a constituent element of the present invention) assembled along the upper edge portion of the frame 24 is formed with a fuse accommodating portion 29 that opens on the upper surface thereof. Yes. A fuse (not shown) is attached to the fuse accommodating portion 29 from above. The upper ends of the plurality of bus bars 12 are each formed with an elongated tab-like terminal portion 12a corresponding to the upper edge portion of the frame 24. The upper end portions of the plurality of terminal portions 12a are the fuse accommodating portions. 29 is accommodated in parallel in the left-right direction.

  Further, the main body portion 28 is located on the front side of the fuse housing portion 29, and is a fitting space that is partially open to the front side of the main body portion 28 and substantially open to the lower surface side. 30 is formed, and a substantially upper half region (wall-like fitting portion 38) of the upper housing 26 is fitted into the fitting space 30 from below.

  Further, the main body portion 28 has a plate-like elastic lock piece in the same manner as the plate-like protection portion 31 extending in a cantilevered manner downward from the upper edge of the opening to the front side of the fitting space 30. 32 is formed. Three protective portions 31 are provided at intervals in the left-right direction (the length direction of the upper edge portion of the frame-shaped member 21), and the elastic lock pieces 32 are paired so as to be positioned between the three protective portions 31. Is provided. The three protection portions 31 and the two elastic lock pieces 32 are flush with each other, and the base end portion (upper end portion) of the elastic lock piece 32 and the upper end portion of the protection portion 31 adjacent thereto are on the front side of the fitting space 30. A plate-shaped reinforcing portion 33 extending in a cantilevered manner downward from the upper edge of the opening is connected. The reinforcing portion 33 is continuous with the protective portion 31 and the elastic lock piece 32 in a flush manner.

  The left and right side edges of the elastic lock piece 32 form a right angle with respect to the length direction of the main body 28 (one side of the frame-like member 21), and the lower end of the elastic lock piece 32 on the back surface (the surface facing the fitting space 30). A lock protrusion 32a is formed on the portion (extending end). Further, the lower end edge of the elastic lock piece 32 is located slightly above the lower end edge of the protection part 31. That is, the elastic lock piece 32 is positioned so as to retreat upward from the lower end of the protection part 31.

Side edges and opposing surfaces of the resilient locking piece 32 in the protection unit 31 (edge) has a guide surface 34. The guide surfaces 34 are paired so as to sandwich one elastic lock piece 32, and the pair of guide surfaces 34 is an assembly direction of the upper housing 26 with respect to the fuse block 25 (frame member 21) (see FIG. A taper is formed such that the interval gradually decreases in the upward direction. That is, the side edge portion of the elastic lock piece 32 and the guide surface 34 are not parallel.

  In addition, the width dimension (the dimension in the left-right direction) of the two protection parts 31 located on the left and right sides of the three protection parts 31 is gradually increased toward the assembly direction of the upper housing 26 with respect to the frame-shaped member 21. . That is, the outer side surfaces (side surfaces that do not face the elastic lock pieces 32) of the two protection portions 31 located on the left and right sides are opposite to the inner side surfaces (guide surfaces 34 that face the elastic lock pieces 32) of the respective protection portions 31. It becomes a pair of taper surface 35 which makes the taper shape of direction.

  The body portion 28 of the fuse block 25 is formed with a pair of left and right screw holes 36 having an axis oriented in the front-rear direction and a front end opened to the inner surface of the fitting space 30. The pair of screw holes 36 are disposed at both left and right end portions of the fitting space 30, and when viewed from the front, three protective portions 31 and two elastic lock pieces 32 are disposed between the pair of screw holes 36. .

  A plurality of terminal fittings 14 are attached to the fuse block 25. The terminal fitting 14 is formed by bending a long and narrow metal material into a stepped shape. The upper upper half region is an upper connection portion 14a, and the lower lower half region is a lower connection portion 14b. The connecting portions 14a and 14b are connected via a connecting portion 14c in the front-rear direction (horizontal direction). The upper connection portion 14 a is arranged in front of the terminal portion 12 a of the bus bar 12 (in the front surface side) and in parallel in the fuse housing portion 29. The lower connecting portion 14b protrudes downward (in parallel with the assembly direction of the upper housing 26 with respect to the frame-like member 21) from a position behind the fitting space 30 on the lower surface of the main body portion 28 (back side). The terminal fitting 14 is fixed to the fuse block 25 by locking the upper connection portion 14 a to the locking portion 29 a of the fuse housing portion 29. The lower connection portions 14b of the plurality of fixed terminal fittings 14 are arranged in parallel along the length direction of the main body portion 28 (one side of the frame-shaped member 21).

The upper housing 26 is formed in a block shape that is elongated in the left-right direction as a whole, is opened downward and has a cylindrical fitting portion 37 whose inner space is partitioned left and right, and rises upward from the upper surface of the cylindrical fitting portion 37. It is comprised from the wall-shaped fitting part 38. FIG. A pair of through-holes 39 penetrating in the front-rear direction are formed at both left and right end portions of the wall-shaped fitting portion 38. Further, the wall-like fitting portion 38 is formed with a total of five concave portions 40A and 40B. The five concave portions 40A and 40B are arranged corresponding to the three protective portions 31 and the two elastic lock pieces 32 of the frame-shaped member 21 (fuse block 25), and the front side and the upper surface of the wall-shaped fitting portion 38 are arranged. It is open to the side.

Of the five concave portions 40A and 40B, two portions sandwiched between the three large concave portions 40A corresponding to the protection portion 31 serve as guided portions 41 , respectively. Each guided portion 41 has a bifurcated shape in which a small recess 40B corresponding to the elastic lock piece 32 is sandwiched between a pair of left and right ribs 41a. The left and right outer surfaces of each guided portion 41 are tapered parallel to the guide surface 34 of the frame-shaped member 21. That is, the width dimension of the guided portion 41 is gradually narrower in the assembling direction of the upper housing 26 with respect to the frame-shaped member 21.

Further, in the small recess 40B arranged in the guided portion 41, a lock portion 41b that protrudes toward the front side is formed. The lock portion 41 b constitutes a lock means 42 together with the elastic lock piece 32. Note that the distance between the left and right inner surfaces of the small recess 40B is a constant dimension that is slightly larger than the width dimension of the elastic lock piece 32. The three inner surfaces facing the guided portion 41 of the 2 Tsunodai recess 40A located on the left and right sides of the Tsunodai recess 40A has a tapered surface 35 parallel to the tapered surface 43 of the protecting portion 31 of the fuse block 25 ing.

Next, the operation of this embodiment will be described.
When the upper housing 26 is assembled to the main body 28 (one side of the frame-shaped member 21) of the fuse block 25, the plurality of terminal fittings 14 are attached to the fuse block 25 in advance. From this state, the upper housing 26 is brought close to the main body portion 28 from below to insert the wall-like fitting portion 38 into the fitting space 30, and the lower connection portion 14 b of the terminal fitting 14 is placed in the cylindrical fitting portion 37. In this case, the upper end portion of the guided portion 41 enters between the pair of guide surfaces 34 before the lower end portion of the elastic lock piece 32 enters the small recess 40B. At this time, since the width dimension of the upper end of the guided portion 41 is sufficiently smaller than the distance between the lower ends of the pair of guide surfaces 34, the guided portion 41 can be made to enter relatively easily. Further, the left and right ribs 41a of each guided portion 41 enter the space between the elastic lock piece 32 and the guide surface 34, respectively, and the pair of ribs 41a are positioned so as to sandwich the elastic lock piece 32 from the left and right. To do. When the guided portion 41 enters between the pair of guide surfaces 34, the upper housing 26 is prevented from large relative movement in the left-right direction with respect to the fuse block 25 and is generally positioned.

When the assembly of the upper housing 26 is advanced from this state, the guided portion 41 is guided by a pair of guide surfaces 34 that are inclined with respect to the assembly direction, so that the upper housing 26 is laterally moved with respect to the main body portion 28. Positioning is gradually performed at Positioning is also performed by fitting the tapered surfaces 35 of the protection portions 31 at both left and right ends with the tapered surfaces 43 of the large concave portions 40A at both left and right ends. Further, in the assembly process, the elastic protrusions 32a of the elastic lock pieces 32 interfere with the lock portions 41b, so that the elastic lock pieces 32 are elastically bent toward the front side.

When the upper housing 26 reaches the proper assembly position with respect to the main body portion 28, the lock portion 41b passes through the lock protrusion 32a, the elastic lock piece 32 is elastically restored, and the lock protrusion 32a is moved to the lock portion 41b. Lock from below. Due to the locking action of the lock projection 32a and the lock portion 41b, the upper housing 26 is locked in a state in which the upper housing 26 is restricted from being detached downward from the main body portion 28. At this time, since the elastic lock pieces 32 are arranged in a pair so as to be separated from each other in the left and right directions, the upper housing 26 is not inclined with respect to the main body portion 28. In addition, a gap corresponding to a dimensional difference between the opening width of the lower end of the guide surface 34 and the width of the upper end portion of the guided portion 41 is provided between the side edge of the elastic lock piece 32 and the side surface of the rib 41a. ing. That is, the width dimension of the elastic lock piece 32 is smaller than the width dimension of the small recess 40B.

  When the upper housing 26 is assembled to the normal position as described above, the lower connection portions 14b of the plurality of terminal fittings 14 are accommodated in parallel in the cylindrical fitting portion 37 of the upper housing 26. Further, since the through hole 39 of the upper housing 26 is coaxially aligned with the screw hole 36 of the main body 28, after that, if the screw 45 inserted into the through hole 39 is screwed into the screw hole 36 and tightened, the upper housing 26 is fixed to the fuse block 25 so as not to move.

  As described above, in the present embodiment, when the upper housing 26 is assembled to the frame-shaped member 21 in the correct posture, the lock that the elastic lock piece 32 and the lock portion 41b are locked in both the left and right lock means 42. However, when the upper housing 26 is assembled obliquely with respect to the main body portion 28, the unlocking state in which the elastic lock piece 32 and the lock portion 41b are not locked in the one lock means 42 is brought about. Therefore, whether or not the upper housing 26 is assembled in the correct posture can be determined based on whether or not both of the two locking means 42 are in the locked state. Since the lock means 42 has an elastic lock piece 32 that is elastically bent during the assembly process, whether or not the lock means 42 is in a locked state is determined when the elastic lock piece 32 is elastically restored. This can be determined by whether or not a sound is generated due to the locking operation with the portion 41b.

In addition, the frame-shaped member 21 has a pair of tapered guide surfaces 34 whose intervals gradually narrow toward the front (upward) of the upper housing 26 in the assembly direction. ) a plurality spaced apart in, in the upper housing 26, a tapered guided portion 41 in which its width is gradually reduced toward other party assembly of the upper housing 26, the length of one side of the frame member 21 Since two are provided at intervals in the direction, the inclination of the upper housing 26 can be reliably prevented. Furthermore , since the guide surface 34 and the guided portion 41 are tapered, positioning at the initial stage of assembly is easy.

Further, since the elastic lock piece 32 is arranged so as to be sandwiched between the two right and left protection portions 31 constituting the pair of guide surfaces 34, it is protected from interference of foreign matter.
The guided portion 41 has a bifurcated shape that can be fitted in two spaces formed between the elastic lock piece 32 and the pair of guide surfaces 34. That is, since the guided portion 41 is fitted using the space between the elastic lock piece 32 and the protective portion 31, the structure is simpler than that provided with a dedicated space for fitting the guided portion. Has been realized.
Moreover, since the base end part of the elastic lock piece 32 and the protection part 31 are continued by the reinforcing part 33, the strength of the elastic lock piece 32 is increased.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the formation base of the guide portion and the guided surface is reversed from that of the first embodiment. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
On the front surface of the upper housing 26, there are provided three protection portions 50 spaced apart in the left-right direction and a pair of elastic lock pieces 51 positioned between the three protection portions 50. The left and right side edges of the elastic lock piece 51 form a right angle with respect to the length direction of the upper housing 26, and the lock protrusion similar to that of the first embodiment is formed on the upper end (extended end) of the back surface of the elastic lock piece 51. (Not shown in FIG. 8) is formed. Further, the upper end edge of the elastic lock piece 51 is located slightly below the upper end edge of the protection part 50. That is, the elastic lock piece 51 is positioned so as to be retracted below the upper end of the protection part 50.
Side edges and opposing surfaces of the elastic lock piece 51 of the protective unit 50 (edge) has a guided surface 52. The guided surfaces 52 are paired so as to sandwich one elastic lock piece 51, and the pair of guided surfaces 52 are assembled to the fuse block 25 (frame member 21). The taper shape is such that the interval gradually increases in the direction (upward direction). That is, the side edge portion of the elastic lock piece 51 and the guided surface 52 are not parallel.

The body portion 28 of the fuse block 25, a total of five recesses 53A, 53B are formed. The five recesses 53 </ b> A and 53 </ b> B are arranged corresponding to the three protection portions 50 and the two elastic lock pieces 51 of the upper housing 26. Of the five concave portions 53A and 53B, two portions sandwiched between the three large concave portions 53A corresponding to the protection portion 50 serve as guide portions 54 , respectively. Each guide portion 54 has a bifurcated shape in which a small concave portion 53B corresponding to the elastic lock piece 51 is sandwiched between a pair of left and right ribs 54a. Both left and right outer surfaces of the guide portion 54 are tapered parallel to the guided surface 52 of the upper housing 26. That is, the width dimension of the guide portion 54 gradually becomes wider in the assembling direction of the upper housing 26 with respect to the frame-shaped member 21.
In addition, a lock portion 54 b that protrudes toward the front side is formed in the small recess 53 </ b> B disposed in the guide portion 54. The lock portion 54 b constitutes a lock means 55 together with the elastic lock piece 51. The interval between the left and right inner surfaces of the small concave portion 53B is set to a constant dimension that is slightly larger than the width dimension of the elastic lock piece 51.

Next, the operation of this embodiment will be described.
In the process of assembling the upper housing 26 to the main body portion 28 (one side of the frame-like member 21) of the fuse block 25, the lower end portion of the guide portion 54 is moved before the upper end portion of the elastic lock piece 51 enters the small recess 53B. It enters between a pair of guided surfaces 52. At this time, since the width dimension of the lower end of the guide part 54 is sufficiently smaller than the distance between the upper ends of the pair of guided surfaces 52, the guide part 54 can be made to enter relatively easily. Further, the left and right ribs 54a of the guide portion 54 respectively enter the space between the elastic lock piece 51 and the guided surface 52, and the pair of ribs 54a are positioned so as to sandwich the elastic lock piece 51 from the left and right. . When the guide portion 54 enters between the pair of guided surfaces 52, the upper housing 26 is prevented from large relative movement in the left-right direction with respect to the fuse block 25 and is generally positioned.

When the assembly of the upper housing 26 is advanced from this state, the pair of guided surfaces 34 are guided by the guide portions 54 that are inclined with respect to the assembly direction, so that the upper housing 26 is laterally moved with respect to the main body portion 28. Positioning is gradually performed at Furthermore, in the assembly process, the elastic lock piece 51 is elastically bent toward the front side by the lock protrusion of the elastic lock piece 51 interfering with the lock portion 54b.
When the upper housing 26 reaches the proper assembly position with respect to the main body portion 28, the lock portion 54b passes through the lock protrusion, the elastic lock piece 51 is elastically restored, and the lock protrusion is raised above the lock portion 54b. Lock from. Due to the locking action of the lock protrusion and the lock portion 54b, the upper housing 26 is locked in a state in which the upper housing 26 is restricted from being detached downward from the main body portion 28. At this time, since the elastic lock pieces 51 are arranged in a pair so as to be separated from each other in the left and right directions, the upper housing 26 is not inclined with respect to the main body portion 28. Further, a gap corresponding to a dimensional difference between the opening width of the upper end of the guided surface 52 and the width of the lower end of the guide portion 54 is provided between the side edge of the elastic lock piece 51 and the side surface of the rib 54a. ing. That is, the width dimension of the elastic lock piece 51 is smaller than the width dimension of the small recess 53B.

  As described above, in the present embodiment, when the upper housing 26 is assembled with the frame-shaped member 21 in the correct posture, the lock in which the elastic lock piece 51 and the lock portion 54b are engaged in both the left and right lock means 55. However, when the upper housing 26 is assembled obliquely with respect to the main body 28, the unlocking state in which the elastic locking piece 51 and the locking portion 54 b are not locked in the one locking means 55 is brought about. Therefore, whether or not the upper housing 26 is assembled in the correct posture can be determined based on whether or not both of the two locking means 55 are in the locked state. Since the lock means 55 has an elastic lock piece 51 that is elastically bent during the assembly process, whether or not the lock means 55 is in the locked state is locked when the elastic lock piece 51 is elastically restored. This can be determined by whether or not a sound is generated due to the locking operation with the portion 54b.

Further, the upper housing 26, a pair of tapered guided surface 52 which gradually spread apart toward other party (upper) assembly of the upper housing 26, one side of the frame member 21 longitudinally (left-right direction ) a plurality spaced apart in, in the frame-shaped member 21, a tapered guide portion 54 gradually toward other party becomes wider assembly of upper housing 26, the length direction of one side of the frame member 21 As a result, the upper housing 26 can be reliably prevented from tilting. Furthermore , since the guide portion 54 and the guided surface 52 are tapered, alignment at the initial stage of assembly is easy.

Further, since the elastic lock piece 51 is disposed so as to be sandwiched between the two right and left protection parts 50 constituting the pair of guided surfaces 52, it is protected from the interference of foreign matter.
The guide portion 54 has a bifurcated shape that can be fitted into two spaces formed between the elastic lock piece 51 and the pair of guided surfaces 52. That is, since the guide part 54 is fitted using the space between the elastic lock piece 51 and the protection part 50, the structure is simplified as compared with the case where a dedicated space for fitting the guided part is provided. Is realized.

<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 the above embodiment, two locking means are provided for one connector housing, but three or more locking means may be provided for one connector housing.
(2) In the embodiment described above, the assembly target of the connector housing is the fuse block, but the connector housing may be assembled to the frame.
(3) In the above embodiment, the elastic lock piece is formed only on the frame-shaped member and the lock portion is formed only on the connector housing. However, the elastic lock piece is formed only on the connector housing and the lock portion is formed only on the frame-shaped member. Alternatively, both the elastic lock piece and the lock portion may be formed on the frame-shaped member, and both the elastic lock piece and the lock portion may be formed on the connector housing.
(4) In the above embodiment, the guide surface and the guided portion, or the guide portion and the guided surface are arranged so as to sandwich the elastic lock piece. However, the guide surface and the guided portion, or the guide portion and the guided surface are The arrangement may be such that the elastic lock piece is not sandwiched.
(5) In the above embodiment, a pair of guide surfaces are formed in the protection part, and the elastic lock piece is disposed between the pair of guide surfaces. However, the elastic lock piece may be disposed between the pair of guided surfaces. Good.

Front view of Embodiment 1 Cross section Cross section Perspective view showing disassembled state of fuse block, upper housing and terminal fitting Front view of fuse block Front view of upper housing Cross section of upper housing Front view of fuse block and upper housing of embodiment 2

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 14 ... Terminal metal fitting 20 ... Case 21 ... Frame-shaped member 26 ... Upper housing (connector housing)
28 ... Main body of fuse block (one side of frame-shaped member)
DESCRIPTION OF SYMBOLS 31 ... Protection part 32 ... Elastic lock piece 33 ... Reinforcement part 34 ... Guide surface 41 ... Guided part 41b ... Lock part 42 ... Locking means

Claims (5)

A circuit structure is housed in a case,
The case includes a frame-like member assembled along the periphery of the circuit structure, and a connector housing assembled along one side of the frame-shaped member;
The circuit structure includes a plurality of terminal fittings arranged in parallel along one side of the frame-shaped member;
In a state where the connector housing is assembled to one side of the frame-shaped member, the plurality of terminal fittings are accommodated in parallel in the connector housing,
The frame-shaped member and the connector housing are separated from the frame-shaped member by locking the elastic lock piece that is elastically bent during the assembly process of the connector housing and the elastic lock piece that is elastically restored. And a plurality of locking means provided with a locking portion for restricting the frame-shaped member at intervals in the length direction of one side of the frame-shaped member,
The frame-shaped member has a plurality of plate-like protective portions extending in a cantilevered manner toward the opposite side of the connector housing assembly direction, spaced in the length direction of one side of the frame-shaped member. Are formed side by side, and a pair of edge portions located on the inner side in the length direction of one side of the frame-shaped member among the adjacent protection portions are gradually toward the assembly direction of the connector housing. A pair of guide surfaces having a tapered shape in which the interval is narrowed are provided, and the pair of guide surfaces are provided in a plurality of sets at intervals in the length direction of one side of the frame-shaped member,
The connector housing is provided with a wall-like fitting portion that rises toward the direction of assembly of the connector housing, and the wall-like fitting portion has the connector housing assembled at a position corresponding to the protection portion. A plurality of large recesses opened to the front side in the attaching direction are formed side by side in the length direction of one side of the frame-shaped member, and a portion sandwiched between the adjacent large recesses is a guided portion. And both outer side surfaces in the length direction of one side of the frame-shaped member of the guided portion are formed in a tapered shape gradually becoming narrower toward the direction of assembly of the connector housing, The electrical connection box, wherein a plurality of the guided portions are provided at intervals in the length direction of one side of the frame-shaped member. The elastic lock piece is disposed between the pair of guide surfaces formed in the adjacent protection portions,
  In the guided portion, a pair of ribs is formed by forming a small recess that is opened to the front side in the assembly direction of the connector housing at a position corresponding to the elastic locking piece,
  The said guided part has comprised the forked shape which can be fitted in the space between the said elastic lock piece and said pair of guide surface by the said small recessed part and a pair of said rib. The electrical junction box according to 1. A circuit structure is housed in a case,
  The case includes a frame-like member assembled along the periphery of the circuit structure, and a connector housing assembled along one side of the frame-shaped member;
  The circuit structure includes a plurality of terminal fittings arranged in parallel along one side of the frame-shaped member;
  In a state where the connector housing is assembled to one side of the frame-shaped member, the plurality of terminal fittings are accommodated in parallel in the connector housing,
  The frame-shaped member and the connector housing are separated from the frame-shaped member by locking the elastic lock piece that is elastically bent during the assembly process of the connector housing and the elastic lock piece that is elastically restored. And a plurality of locking means provided with a locking portion for restricting the frame-shaped member at intervals in the length direction of one side of the frame-shaped member,
  The frame-like member is formed with a plurality of large recesses that are opened to the opposite side to the assembly direction of the connector housing and are arranged adjacent to each other in the length direction of one side of the frame-like member. A portion sandwiched between the large concave portions is a guide portion, and both outer side surfaces in the length direction of one side of the frame-shaped member of the guide portion are gradually widened toward the front in the assembly direction of the connector housing. A plurality of the guide portions are provided at intervals in the length direction of one side of the frame-shaped member;
  In the connector housing, a protection portion is formed at a position corresponding to the large recess with a gap in the length direction of one side of the frame-shaped member. A pair of edge surfaces located on the inner side in the lengthwise direction of one side are provided with a pair of guided surfaces having a tapered shape in which the distance gradually increases toward the direction of assembly of the connector housing. An electrical junction box, wherein a plurality of guide surfaces are provided at intervals in the length direction of one side of the frame-shaped member. The elastic lock piece is disposed between the pair of guided surfaces formed in the adjacent protection portions,
  In the guide portion, a pair of ribs is formed by forming a small recess that is opened on the opposite side to the assembly direction of the connector housing at a position corresponding to the elastic lock piece,
  The said guide part has comprised the forked shape which can be fitted in the space between the said elastic lock piece and said pair of to-be-guided surface by the said small recessed part and a pair of said rib. 3. The electrical junction box according to 3. The elastic lock piece is configured to extend in a cantilever manner, and is disposed between the adjacent protection portions provided along the side edge portion thereof,
  The electrical connection box according to any one of claims 1 to 4, wherein a base end portion of the elastic lock piece and the protection portion are connected by a reinforcing portion.

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