JP2014175534A - Housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing which achieves assemblability and vibration resistance without increasing the costs.SOLUTION: A housing 7 includes: a resin case 10; a resin cover 20 which is attached to the resin case 10; an engaged body 51 which is formed on an outer surface of a side wall of the resin case 10 protruding therefrom; an engaging body 61 extending from an outer surface of a side wall of the resin cover 20 in a tip direction of the side wall; and a flexible protruding part 63 which is erected at a tip of the side wall of the resin cover 20 and may elastically deform in a direction that moves away from the engaging body 61.

Description

  The present invention relates to a housing.

An electronic control device mounted on an automobile or the like is configured by housing an electronic circuit board on which electronic components are mounted in a resin casing made up of a case and a cover.
In such an electronic control device, it is required to improve the assembling and vibration resistance of the casing and to reduce the cost.

The following Patent Document 1 discloses a housing using a snap fit as an engagement mechanism between a case and a cover. The snap fit includes a protrusion-shaped engaged body formed on the side wall of the case and a flexible hook-shaped engaging body formed on the side wall of the cover. Further, this housing has an arc-shaped flange portion having a constant curvature at the upper end of the side wall of the cover.
When the cover side wall is brought into close contact with the side wall of the case and the cover is bent, the engaging body is fitted and engaged with the engaged body. After that, the engaging body is pressed against the engaged body by the restoring force of the cover, and the case and the cover are closely attached and fixed without backlash.

JP 2001-186629 A

In the technique described above, if the amount of bending of the cover is not appropriate, the snap-fit engaging body and the engaged body are difficult to engage with each other, or rattling occurs between the engaging body and the engaged body.
When it is difficult for the engaging body and the engaged body to engage with each other, an excessive load is applied to the engaging body, which may cause cracking or damage. On the other hand, when rattling occurs between the engaging body and the engaged body, a gap is generated in the housing, the dustproofness is reduced, and the electronic circuit board accommodated in the interior is defective, or due to vibration. There is a possibility that abnormal noise is generated from the case or snap fit, or an excessive load is applied to the engaging body, causing cracks or breakage.
For this reason, it is necessary to appropriately manage the amount of bending of the cover. However, since a dimensional variation (molding error) is likely to occur in a casing that is a resin molded product, high accuracy of the mold is required for managing the amount of bending. There is a problem that the mold cost is increased by the adjustment, and the cost increase is unavoidable.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a housing capable of achieving assembly and vibration resistance without causing an increase in cost.

In order to solve the above problems, the following means were adopted.
The housing of the present invention is a housing comprising a resin case and a resin cover attached to the resin case, and an engaged body formed to protrude from an outer surface of a side wall of the resin case, An engaging body that extends from the outer surface of the side wall of the resin cover toward the front end of the side wall, and a flexible protrusion that stands up at the front end of the side wall of the resin cover and is elastically deformable in a direction away from the engaging body. And a section.

  The resin case has a first inclined surface facing away from the engaged body at a front end of a side wall thereof, and the flexible protrusion is opposed to the engaging body at a portion where the first inclined surface contacts. And having a second inclined surface.

  A guide rib is formed along the base end side of the engaging body and guides the side wall of the resin case toward the flexible protrusion.

  A stopper portion that protrudes lower than the flexible protrusion at the front end of the side wall of the resin cover and restricts movement of the side wall of the resin case is provided.

  A guide claw is provided that extends from the outer surface of the side wall of the resin case toward the front end of the side wall and guides the side wall of the resin cover toward the side wall of the resin case.

  A guide wall is provided on the outer surface of the side wall of the resin case so as to sandwich the engaged body and guide the engaging body toward the engaged body.

  The present invention can realize a housing capable of improving assemblability and vibration resistance without causing an increase in cost. With a simple structure, an appropriate load can be applied to the snap fit while absorbing a dimensional error of the housing. Thus, the vibration resistance can be improved by deteriorating the assemblability and fixing the case and the cover closely together without looseness.

It is a perspective view of the housing | casing 7 which concerns on 1st embodiment of this invention. It is a figure which shows the to-be-engaged part. It is a figure which shows the engaging part. It is a figure which shows the engagement state of the snap fit.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, an electronic control device is illustrated as an embodiment of the electronic device.
FIG. 1 is a perspective view of a housing 7 according to the first embodiment of the present invention, where (a) is an exploded view and (b) is an assembly view.
The thickness direction of the housing 7 (the extending direction of the annular hook portion 61 and the guide claw 53) is referred to as the Z direction. The case 10 side (the extending direction of the ring-shaped hook portion 61) is the + Z direction, and the case 20 side (the extending direction of the guide claws 53) is the -Z direction.

  The electronic control device (electronic device) 1 includes a printed circuit board (electronic circuit board) 5 and a housing 7. The housing 7 includes a case 10 and a cover 20. The case 10 and the cover 20 are fixed by a plurality of snap fits 8. The printed circuit board 5 is housed and fixed in the housing space 7S of the housing 7.

  The electronic control device 1 is related to an electronic control unit (ECU) mounted on a vehicle (not shown). The electronic control device 1 is attached to, for example, a battery storage box (battery box) (not shown), and is connected to a battery in the battery storage box or a higher-level electronic control device by a connector wiring cable. Alternatively, it may be directly attached to the vehicle body (vehicle frame) and electrically connected by a connector wiring cable.

The printed circuit board 5 is a multilayer board in which a wiring pattern (not shown) is formed on each surface including the inner layer. As shown in FIG. 1A, the printed circuit board 5 has various electronic components (not shown) mounted on both sides, and five connectors 6 mounted on one surface 5a (surface facing the case 10). .
These connectors 6 are made of a resin material such as PBT (polybutylene terephthalate) or PPS (polyphenylene sulfide), and are fixed to the printed circuit board 5 by screwing or surface mounting using solder.
Insertion holes (not shown) are provided at four corners of the printed circuit board 5. The printed circuit board 5 is fixed to the case 10 by the screw inserted through the insertion hole.

The connector 6 has an opening 6a into which a plug (not shown) of a connector wiring cable is fitted. The connector 6 has a box shape having an opening 6a, and a connector terminal soldered to the printed circuit board 5 is exposed in the opening 6a. The connector 6 is accommodated in a connector opening 13 formed in the case 10.
Under such a configuration, when the plug of the connector wiring cable is fitted into the opening 6a of the connector 6, various electronic components mounted on the printed circuit board 5 are electrically connected to a battery or the like in the battery storage box. It has come to be.

The case (resin case) 10 has a bottomed rectangular box shape, and is made of, for example, PBT. The case 10 has a substantially rectangular main wall 11 and a side wall 12 that stands substantially vertically along the periphery of the main wall 11. The surface surrounded by the upper end surface 12t of the side wall 12 is the opening 10a of the case 10.
A space surrounded by the main wall 11 and the side wall 12 becomes an accommodation space 7S in which the printed circuit board 5 is accommodated, and the printed circuit board 5 is inserted from the opening 10a of the case 10 toward the main wall 11.
In the side wall 12, five connector openings 13 are formed corresponding to the five connectors 6 so that the openings 6 a of the connectors 6 are exposed to the outside. A plurality of these connector openings 13 are formed on each of the long side and the short side of the side wall 12.

The case 10 is provided with nine engaged portions 50 on the side wall 12 thereof. The nine engaged portions 50 are engaged with nine engaging portions 60 formed on the cover 20.
The detailed configuration of the engaged portion 50 will be described later.

The case 10 includes a plurality of pedestal portions (not shown) that support the printed circuit board 5 in the accommodation space 7S. The pedestal portion is a cylindrical portion integrally formed with the bottom surface 11b of the main wall 11 of the case 10, and stands up toward the opening 10a.
A screw hole is formed in the distal end surface of the pedestal portion. This is a screw hole into which a screw inserted into the insertion hole of the printed board 5 is screwed.

As shown in FIG. 1A, the cover (resin cover) 20 has a substantially rectangular plate shape substantially corresponding to the shape of the main wall 11 of the case 10, and is made of, for example, PBT. The cover 20 has a substantially rectangular main wall 21 and a side wall 22 standing substantially vertically along the periphery of the main wall 21.
The cover 20 is attached to the upper end surface 12t of the side wall 12 of the case 10 and closes the opening 10a. That is, the side wall 22 of the cover 20 and the side wall 12 of the case 10 are in close contact with each other to close the accommodation space 7S in which the printed circuit board 5 is accommodated.

On the upper end surface 22 t of the side wall 22 of the cover 20, a seal member 40 arranged in a rectangular ring shape along the side wall 22 is provided.
In addition, nine engaging portions 60 that stand substantially perpendicular to the main wall 21 are integrally provided on the outer surface 22 s of the side wall 22 of the cover 20. As described above, the engaging portion 60 is engaged with the nine engaged portions 50 formed on the side wall 12 of the case 10.
Due to the engaging action of the snap fit 8 including the engaged portion 50 and the engaging portion 60, the cover 20 is in close contact with the upper end surface 12 t of the case 10 and closes the opening 10 a.
The detailed configuration of the engaging portion 60 will be described later.

The detailed shape of the snap fit 8 will be described.
2A and 2B are views showing the engaged portion 50, where FIG. 2A is a front view, FIG. 2B is a side sectional view, FIG. 2C is a bottom view, and FIG.
3A and 3B are views showing the engaging portion 60, where FIG. 3A is a front view, FIG. 3B is a side sectional view, FIG. 3C is a top view, and FIG.

  In each snap fit 8 (the engaged portion 50 and the engaging portion 60), the direction along the side walls 12, 22 is referred to as the Xs direction, and the thickness direction of the side walls 12, 22 is referred to as the Ys direction. The direction in which the outer surfaces 12s and 22s face is defined as the + Ys direction, and the direction in which the inner surfaces 12u and 22u face is defined as the -Ys direction.

  The snap fit 8 includes an engaged portion 50 formed on the side wall 12 of the case 10 and an engaging portion 60 formed on the side wall 22 of the cover 20.

  The engaged portion 50 includes an engaging protrusion 51, a side wall tip slope 52, a guide claw 53, and a guide wall 54.

The engaging protrusion (engaged body) 51 is a main part of the engaged portion 50 and protrudes substantially vertically (+ Ys direction) from the outer surface 12 s of the side wall 12 of the case 10. The engagement protrusion 51 is provided on the base end side of the side wall 12.
The engagement protrusion 51 has an engagement surface 51 a perpendicular to the side wall 12 and an inclined surface (first inclined surface) 51 b that intersects the side wall 12 at an obtuse angle. The engagement surface 51a faces the base end side (+ Z direction) of the side wall 12, and the inclined surface 51b faces the front end side (−Z direction) of the side wall 12. The engaging surface 51 a and the inclined surface 51 b intersect at an acute angle at the tip of the engaging protrusion 51.
An annular hook portion 61 to be described later is fitted into the engaging projection portion 51. Thereby, the engaging protrusion 51 and the ring-shaped hook 61 are engaged, and the engaged portion 50 and the engaging portion 60 are engaged.

The side wall tip slope 52 is a slope formed at a corner where the upper end surface 12t of the side wall 12 of the case 10 and the inner surface 12u intersect. That is, the side wall front end inclined surface 52 is a surface facing away from the engaging protrusion 51 (facing the −Ys direction). The side wall front end inclined surface 52 is formed so as to intersect the upper end surface 12t at an angle of about 60 °, for example.
One side wall tip slope 52 is provided for one engagement protrusion 51. The side wall tip slope 52 is disposed so that the position of the side wall 12 in the Xs direction matches the engaging protrusion 51. The width of the side wall tip slope 52 is set to be larger than the width of the flexible projection 63 described later.
The side wall tip slope 52 is in sliding contact with a tip slope 64 of a flexible projection 63 described later. Thereby, the flexible protrusion 63 is elastically deformed (inclined).

The guide claw 53 is a portion extending from the upper end edge of the outer surface 12s of the side wall 12 of the case 10 so as to be perpendicular (−Z direction) to the upper end surface 12t. That is, the guide claw 53 is formed in a claw shape that protrudes toward the cover 20 from the upper end edge of the outer surface 12 s of the side wall 12. The guide claw 53 has an inner surface 53 a that faces the outer surface 12 s of the side wall 12 (facing the −Ys direction).
Two guide claws 53 are provided for one engagement protrusion 51. In the Xs direction of the side wall 12, the two guide claws 53 are arranged so as to sandwich one engagement protrusion 51. The distance between the two guide claws 53 in the Xs direction of the side wall 12 is arranged so as to be wider than the width of an annular hook portion 61 described later.
The outer surface 22 s of the side wall 22 of the cover 20 is in sliding contact with the inner surface 53 a of the guide claw 53. Thus, the upper end surface 22t of the side wall 22 of the cover 20 is guided (guided) toward the upper end surface 12t of the side wall 12 of the case 10.

The guide wall 54 is a rib-shaped portion that extends linearly in the Z direction of the side wall 12 on the outer surface 12 s of the side wall 12 of the case 10.
Two guide walls 54 are provided for one engagement protrusion 51. The guide wall 54 is disposed so as to sandwich the engaging protrusion 51 in the Xs direction of the side wall 12. The distance between the two guide walls 54 in the Xs direction of the side wall 12 is arranged to be wider than the width of the ring-shaped hook portion 61 described later.
The guide wall 54 is curved so as to surround the engaging protrusion 51 on the base end side (+ Z direction) of the side wall 12. The guide wall 54 contacts the guide claw 53 on the distal end side (−Z direction) of the side wall 12.
An annular hook portion 61, which will be described later, slidably contacts the inner wall surface 54a of the guide wall 54. Thereby, the ring-shaped hook part 61 is guided (guided) toward the engaging projection part 51.

  The engaging part 60 includes an annular hook part 61, a guide rib 62, a flexible protrusion 63 and a stopper 65.

The ring-shaped hook part (engagement body) 61 is a main part of the engagement part 60, and is perpendicular to the upper end surface 22 t (+ Z direction) from the upper end edge of the outer surface 22 s of the side wall 22 of the cover 20. It is a part that extends to. That is, the ring-shaped hook portion 61 protrudes from the upper end edge of the outer surface 22 s of the side wall 22 toward the case 10.
The ring-shaped hook portion 61 has a ring shape in which two elongated rod-shaped members protruding from the upper end edge of the outer surface 22s of the side wall 22 toward the case 10 are curved and connected to each other. That is, it has two arms 61a and an engagement hook 61b connected to the tips of the two arms 61a, and is formed into a horseshoe-shaped or U-shaped hook shape.
The two arms 61a have an inner surface 61c facing the outer surface 22s of the side wall 22 (facing the -Ys direction). The engagement hook 61b has an engagement surface 61d perpendicular to the side wall 22 (facing the −Z direction) on the inner side between the two arms 61a.
The two arms 61 a have flexibility and can be bent (bend) so that the engagement hook 61 b is separated (moved in the + Ys direction) from the outer surface 22 s of the side wall 22.
The distance between the two arms 61 a in the Xs direction of the side wall 22 is arranged to be slightly larger than the width of the engagement protrusion 51.
The ring-shaped hook portion 61 is fitted into the engagement projection portion 51. The engagement protrusion 51 enters between the two arms 61a, and the engagement surface 51a of the engagement protrusion 51 comes into close contact with the engagement surface 61d of the engagement hook 61b. Thereby, the engaging protrusion 51 and the ring-shaped hook 61 are engaged, and the engaged portion 50 and the engaging portion 60 are engaged.

The guide rib 62 is a rib-shaped portion extending along the arm 61a on the base end side (−Z direction) of each of the two arms 61a. The guide rib 62 is erected from the inner surface 61 c of the arm 61 a toward the outer surface 22 s of the side wall 22. The guide rib 62 is extended to substantially the center in the Z direction of the arm 61a.
The guide rib 62 has an upper surface 62a that faces the outer surface 22s in parallel (facing the -Ys direction). The upper surface 62a is disposed so as to be substantially flush with the outer surface 22s. Further, the upper end of the guide rib 62 has an inclined surface 62b that intersects the upper surface 62a and the inner surface 61c.
The side wall 12 of the case 10 is in sliding contact with the upper surface 62 a of the guide rib 62. As a result, the side wall tip slope 52 of the side wall 12 of the case 10 is guided (guided) so as to be surely brought into contact with the tip slope 64 of the flexible projection 63 described later.

The flexible protrusion 63 is a part that stands at a corner where the upper end surface 22t of the side wall 22 of the cover 20 and the inner surface 22u intersect. The flexible protrusion 63 is formed in a flat plate shape along the upper end surface 22t. The width of the flexible protrusion 63 is set smaller than the width of the side wall tip slope 52. The height of the flexible protrusion 63 is about 1/4 to 1/5 of the length of the ring-shaped hook 61. The thickness of the flexible protrusion 63 is approximately half of the thickness of the upper end surface 22t.
One flexible protrusion 63 is provided for one annular hook portion 61. The flexible protrusion 63 is arranged so that the position of the side wall 22 in the Xs direction matches the ring-shaped hook portion 61.

The flexible protrusion 63 has a tip inclined surface 64 facing the ring-shaped hook portion 61 (facing + Ys direction) at the upper end thereof. The tip inclined surface (second inclined surface) 64 is formed so as to intersect with the upper end surface 22t at an angle of, for example, about 50 ° (about 40 ° with respect to the inner surface 22u of the side wall 22).
Thus, since the flexible protrusion 63 is a flat plate-like portion standing on the upper end surface 22t, it has flexibility (elasticity) in its thickness direction (Ys direction).
The side wall front end slope 52 is in sliding contact with the front end slope 64 of the flexible protrusion 63. As a result, the flexible protrusion 63 can warp (bend) so that the tip thereof moves (moves in the −Ys direction) toward the inner surface 22 u of the side wall 22.

The stopper 65 is a portion that protrudes on both sides in the width direction (Xs direction) of the flexible protrusion 63 on the upper end surface 22t of the side wall 22 of the cover 20. The two stoppers 65 are formed integrally with the flexible protrusion 63. The upper end surface 65t of the stopper 65 is formed flat. The height of the stopper 65 is not more than half that of the flexible protrusion 63. It is set lower than the lower end of the tip slope 64 of the flexible protrusion 63. The thickness of the stopper 65 is the same as that of the flexible protrusion 63. The distance between the two stoppers 65 is set to be larger than the width of the side wall tip slope 52.
The upper end surface 65t of the two stoppers 65 is in contact with the upper end surface 12t of the side wall 12 of the case 10 (in the vicinity of the side wall tip inclined surface 52). Thereby, the movement of the side wall 12 of the case 10 is regulated.

Next, the assembly procedure of the electronic control device 1 and the operational effects of the snap fit 8 will be described.
4A and 4B are diagrams showing the snap-fit 8 when engaged, where FIG. 4A is a front view and FIG. 4B is a side sectional view.

First, the case 10 is placed on a work table or the like (not shown) such that the opening 10a faces upward (−Z direction). Then, the printed circuit board 5 is placed on the pedestal portion of the case 10 and is screwed with a screw inserted through the insertion hole of the printed circuit board 5. Thereby, the printed circuit board 5 is positioned. The connector 6 mounted on the printed circuit board 5 is accommodated in the connector opening 13 of the case 10.
Finally, the cover 20 is attached to the case 10. The cover 20 is pressed against the case 10 so that the nine engaging portions 60 provided on the cover 20 are engaged with the nine engaged portions 50 provided on the case 10 (cover 20 is + Z Move in the direction).

When the engaging portion 60 is engaged with the engaged portion 50, the guide wall 54 first acts.
When the cover 20 is brought closer to the case 10, the ring-shaped hook portion 61 extending from the side wall 22 of the cover 20 enters the + Z direction so as to follow the outer surface 22 s of the side wall 12 of the case 10. In the Xs direction of the side wall 12, when the position where the ring-shaped hook portion 61 enters is away from the engaging protrusion 51, the tip of the ring-shaped hook portion 61 comes into contact with the inner wall surface 54 a of the guide wall 54. For this reason, the ring-shaped hook portion 61 is guided by the guide wall 54 and is forcibly moved in a direction approaching the engaging projection portion 51. And the position of the ring-shaped hook part 61 and the engagement protrusion part 51 substantially corresponds in the Xs direction of the side wall 12.
Thereby, the ring-shaped hook part 61 is guided (guided) toward the engaging projection part 51.

When the cover 20 is brought close to the case 10 with the ring-shaped hook portion 61 being guided by the guide wall 54, the engagement hook 61 b of the ring-shaped hook portion 61 comes into contact with the inclined surface 51 b of the engagement protrusion 51.
Further, when the cover 20 is pressed against the case 10, the engagement hook 61b of the ring-shaped hook portion 61 slides up the inclined surface 51b of the engagement protrusion 51, and the ring-shaped hook portion 61 (arm 61a) warps in the + Ys direction. Begins to elastically deform (curve).

Thus, when the ring-shaped hook part 61 starts to deform so as to warp in the + Ys direction, the guide rib 62 acts.
The proximal end side of the arm 61 a of the ring-shaped hook portion 61 also enters the outer surface 22 s of the side wall 12 of the case 10, and the guide rib 62 disposed on the arm 61 a contacts the side wall 12. The inclined surface 62 b of the guide rib 62 contacts the side wall 12, and then the upper surface 62 a slides on the outer surface 12 s of the side wall 12. Since the outer surface 22 s of the side wall 12 of the case 10 contacts the upper surface 62 a of the guide rib 62, the side wall 12 of the case 10 cannot move in the + Ys direction more than the side wall 22 of the cover 20.
Thereby, the side wall tip slope 52 of the side wall 12 of the case 10 is accurately guided (guided) toward the tip slope 64 of the flexible protrusion 63.

Further, when the ring-shaped hook portion 61 starts to deform so as to warp in the + Ys direction, the guide claw 53 also acts.
The side wall 22 of the cover 20 is close to the side wall 12 of the case 10, and the inner surface 53 a of the guide claw 53 comes into contact with the side wall 22. Since the outer surface 22 s of the side wall 22 abuts on the inner surface 53 a of the guide claw 53, the side wall 12 of the case 10 cannot move in the −Ys direction more than the side wall 22 of the cover 20.
Thus, the upper end surface 22t of the side wall 22 of the cover 20 is guided (guided) toward the upper end surface 12t of the side wall 12 of the case 10.

When the cover 20 is pressed against the case 10 and immediately before the engagement hook 61b of the ring-shaped hook 61 gets over the inclined surface 51b of the engagement protrusion 51, the side wall tip inclined surface 52 and the flexible protrusion 63 start to act.
The side wall 22 of the cover 20 is close to the side wall 12 of the case 10, and the flexible protrusion 63 on the upper end surface 22 t of the side wall 22 abuts on the side wall tip slope 52 formed on the upper end surface 12 t of the side wall 12.
Due to the action of the guide wall 54, the guide rib 62, and the guide claw 53, the distal end slope 64 of the flexible protrusion 63 reliably contacts the side wall distal end slope 52.
Since the front end slope 64 and the side wall front end slope 52 are inclined with respect to the upper end surfaces 12t and 22t, the front end slope 64 and the side wall front end slope 52 slide on each other (wedge action). The side wall 12 is in contact with the guide rib 62 and the movement in the Ys direction is restricted, and the side wall 22 is in contact with the guide claw 53 and the movement in the Ys direction is restricted. For this reason, the flexible protrusion 63 starts to be elastically deformed (curved) so as to warp in the −Ys direction.

When the cover 20 is pressed against the case 10 and the engagement hook 61b of the ring-shaped hook portion 61 gets over the inclined surface 51b of the engagement protrusion 51, the warp of the ring-shaped hook portion 61 (arm 61a) returns to its original state. The hook 61b moves so as to be in close contact with the engaging surface 51a of the engaging protrusion 51. That is, the engaging protrusion 51 is fitted into the space between the two arms 61a of the ring-shaped hook 61 and the engaging hook 61b. Then, the engagement surface 61 d of the engagement hook 61 b comes into close contact with the engagement surface 51 a of the engagement protrusion 51.
Thereby, the engaged part 50 and the engaging part 60 are engaged. That is, the case 10 and the cover 20 are fixed by the snap fit 8.

When the engaged portion 50 and the engaging portion 60 are engaged, the flexible protrusion 63 abuts on the side wall tip inclined surface 52, and the curved state in the −Ys direction is maintained.
Further, the seal member 40 provided on the upper end surface 22t of the side wall 22 of the cover 20 is pressed and crushed by the upper end surface 12t of the side wall 12 of the case 10.

The flexible protrusion 63 presses the side wall tip slope 52 that is in close contact with the tip slope 64 by its restoring force. The direction in which the flexible protrusion 63 presses the side wall tip slope 52 is a direction perpendicular to the side wall tip slope 52 and the tip slope 64. That is, the flexible protrusion 63 presses the side wall 12 in the + Ys direction and the + Z direction.
As a result, the engagement protrusion 51 of the case 10 is pressed in the + Ys direction and the + Z direction toward the ring-shaped hook part 61 of the cover 20, and the engagement surface 51 a of the engagement protrusion 51 is It is pressed against the engaging surface 61d.

In this way, the engaging protrusion 51 is pressed against the ring-shaped hook 61 by the restoring force of the flexible protrusion 63. For this reason, since rattling does not occur between the engaging projection 51 and the ring-shaped hook 61, vibration resistance can be improved. Further, since the engagement surface 51a of the engagement protrusion 51 is in close contact with the engagement surface 61d of the ring-shaped hook part 61, the ring-shaped hook part 61 does not naturally warp and get over the engagement protrusion 51. .
Accordingly, the ring-shaped hook portion 61 cannot return in the direction opposite to the pressing direction (+ Z direction) (−Z direction), and the state in which the engagement protrusion 51 is fitted into the ring-shaped hook portion 61 is maintained. Further, the state in which the seal member 40 is pressed and crushed is also maintained.
As described above, the engagement of the snap fit 8 including the engaged portion 50 and the engaging portion 60 allows the cover 20 to be brought into close contact with the opening 10 a of the case 10 to close the opening 10 a. The dust resistance of the housing 7 is ensured.

Since the stopper 65 is provided on the base end side of the flexible protrusion 63, the flexible protrusion 63 is larger than necessary and warps in the -Ys direction so that it does not crack or break. Yes.
If the cover 20 is further pressed against the case 10 after the engagement hook 61b of the ring-shaped hook portion 61 gets over the inclined surface 51b of the engagement projection portion 51, a stopper disposed on the proximal end side of the flexible projection portion 63. The upper end surface 65t of 65 abuts on the upper end surface 12t of the side wall 12 of the case 10. The stopper 65 abuts on both sides of the side wall tip slope 52 in the upper end surface 12t. For this reason, the cover 20 is not pressed too much against the case 10, and the flexible protrusion 63 is prevented from being cracked or broken.

  As described above, according to the housing 7 according to the present embodiment, the engagement protrusion 51 is pressed against the ring-shaped hook part 61 with a simple configuration, and the engagement protrusion 51 and the ring-shaped hook part 61 are interposed. It is possible to prevent rattling. Since the flexible projection 63 that generates a force for pressing the engagement projection 51 against the ring-shaped hook 61 is integrally formed with the cover 20, the cost is not increased.

Further, the housing 7 according to this embodiment causes the side wall tip slope 52 of the side wall 12 to abut against the front end slope 64 of the flexible projection 63 of the side wall 22 to bend the flexible projection 63. Yes. Forming surfaces that are inclined with respect to the side walls 12, 22 (side wall tip slope 52, tip slope 64) and abutting them generate a force that presses the engaging protrusion 51 against the ring-shaped hook 61. .
For this reason, even if a molding error (dimensional variation) occurs in the Z direction of the side walls 12 and 22, the force pressing the engaging protrusion 51 against the ring-shaped hook 61 can be made substantially constant. Without using the upper end surfaces 12t and 22t that are most affected by the molding error in the Z direction of the side walls 12 and 22, it is possible to flexibly use surfaces (side wall tip slope 52 and tip slope 64) that are greatly inclined with respect to this. This is because the protrusion 63 is bent. That is, the mechanism that slides the side wall tip slope 52 and the tip slope 64 can absorb molding errors (dimension variations) in the Z direction of the sidewalls 12 and 22, thereby eliminating molding errors (dimension variations). Therefore, it is not necessary to adjust the mold for increasing the cost.
As described above, the housing 7 can generate a force that presses the engaging protrusion 51 against the ring-shaped hook 61 without being affected by variations in dimensions due to molding errors of the case 10 and the cover 20. Therefore, the housing 7 can always realize high dust resistance and vibration resistance, and does not increase cost. Further, the assemblability of the housing 7 is not affected by the dimensional variation due to the molding error of the case 10 or the cover 20, so that the assemblability can be improved.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, the number and arrangement of snap fits can be set arbitrarily.
The engaging body is not limited to the ring-shaped hook portion, and may be a rod-shaped or plate-shaped hook portion.

  The flexible protrusion is not limited to being integrally formed with the cover, but may be a separate member from the cover. For example, a leaf spring or the like can be used.

  DESCRIPTION OF SYMBOLS 1 ... Electronic controller (electronic device), 5 ... Printed circuit board (electronic circuit board), 7 ... Housing | casing, 10 ... Case (resin case), 12 ... Side wall, 12s ... Outer surface, 12t ... Upper end surface (tip), DESCRIPTION OF SYMBOLS 20 ... Cover (resin cover), 22 ... Side wall, 22s ... Outer surface, 22t ... Upper end surface (tip), 51 ... Engagement protrusion (engaged body), 52 ... Side wall tip slope (first inclined surface), 53 ... guide claws, 54 ... guide walls, 61 ... annular hook parts (engaging bodies), 62 ... guide ribs, 63 ... flexible protrusions, 64 ... tip slopes (second slopes), 65 ... stoppers

Claims (6)

A resin case,
A resin cover to be attached to the resin case;
In a housing comprising
An engaged body formed to protrude from the outer surface of the side wall of the resin case;
An engagement body extending from the outer surface of the side wall of the resin cover toward the front end of the side wall;
A flexible projection that is erected at the tip of the side wall of the resin cover and elastically deformable in a direction away from the engagement body;
A housing comprising: The resin case has a first inclined surface facing away from the engaged body at the tip of the side wall;
The housing according to claim 1, wherein the flexible protrusion has a second inclined surface facing the engaging body at a portion where the first inclined surface abuts.   The housing according to claim 1, further comprising a guide rib that is formed along a base end side of the engaging body and guides a side wall of the resin case toward the flexible protrusion.   4. The stopper according to claim 1, further comprising a stopper portion that protrudes lower than the flexible protrusion at a front end of the side wall of the resin cover and restricts movement of the side wall of the resin case. 5. The enclosure described.   The guide claw that extends from the outer surface of the side wall of the resin case toward the front end of the side wall and guides the side wall of the resin cover toward the side wall of the resin case is provided. The housing | casing as described in any one.   6. The guide wall according to claim 1, further comprising a guide wall that projects so as to sandwich the engaged body on an outer surface of a side wall of the resin case and guides the engaging body toward the engaged body. The housing | casing as described in one.

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