JP2020038958A - Electronic unit - Google Patents

Abstract

To provide an electronic unit capable of suppressing the backlash of each component even when an external force, such as vibration, ranges from the outside when used.SOLUTION: An electronic unit 1 comprises: a circuit board 10 including electronic components and a terminal 11; a terminal holder 20 fixed to the circuit board 10 and for holding the terminal 11; a first housing 30 assembled so as to contact the terminal holder 20; and a second housing 40 assembled to the first housing 30 so as to sandwich the terminal holder 20 together with the first housings 30. The second housing 40 is engaged to the first housing 30 so as to control the movement of the first housing 30 to be separated from the terminal holder 20 and is constituted so as to maintain the state of contacting the terminal holder 20 to the first housing 30 by elastically pressing the terminal holder 20 against the first housing 30 through a press piece 45 extended from the second housing 40.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic unit in which a circuit board provided with electronic components is housed in a housing.

  2. Description of the Related Art Conventionally, there has been proposed an electronic unit including a circuit board provided with electronic components, terminals, connectors, and the like, and a case for housing the circuit board. For example, in one conventional electronic unit, a connector and a case are assembled by inserting a protrusion of a connector provided on a circuit board into a recess of the case (see Patent Document 1). .

JP 2014-217254 A

  In the above-described conventional electronic unit, a gap may be formed between the protrusion and the recess due to a manufacturing dimensional tolerance (a so-called manufacturing variation) or the like at a place where the protrusion of the connector and the recess of the case are assembled. When a conventional electronic unit is used by being mounted on an automobile or the like, when vibrations during the traveling of the automobile are transmitted to the electronic unit, rattling may occur between the connector and the case due to the gap. Although the electronic unit is designed on the assumption that such rattling can occur, if the rattling becomes excessively large, the internal components of the electronic unit (for example, terminal holders and circuit boards) may also undergo excessive vibration. May occur. It is desirable that the vibration of each component constituting such an electronic unit is suppressed as much as possible from the viewpoint of maintaining proper operation of the electronic component built in the electronic unit.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electronic unit capable of suppressing rattling of each component even when external force such as vibration is applied from outside during use.

In order to achieve the above-mentioned object, an electronic unit according to the present invention is characterized by the following [1] to [6].
[1]
A circuit board on which electronic components and input / output terminals are provided;
A terminal holder fixed to the circuit board and holding the terminal,
A first housing assembled to abut the terminal holder;
A second housing assembled to the first housing so as to sandwich the terminal holder between the first housing and the first housing, wherein the second housing restricts movement of the first housing away from the terminal holder; The terminal holder and the first housing by elastically pressing the terminal holder against the first housing via a pressing piece extending from the second housing. A second housing configured to maintain a state in which the first housing is in contact with the first housing.
Be an electronic unit.
[2]
In the electronic unit according to the above [1],
The first housing is
Abutting on the terminal holder while being pressed along a predetermined assembling direction,
The second housing,
The engaging portion provided on the second housing engages with the engaged portion of the first housing, the pressing piece presses the pressed portion of the terminal holder, and The interval between the engaging portion and the pressing piece is narrower than the interval between the engaged portion and the pressed portion in the assembling direction,
Be an electronic unit.
[3]
In the electronic unit according to the above [2],
The second housing,
A plurality of wall surfaces that define a rectangular cylindrical space for housing the circuit board and the terminal holder separately from the outside and the first housing,
The engagement portion includes:
Provided on one wall surface of the second housing,
The pressing piece,
Provided to extend from the one wall surface,
Be an electronic unit.
[4]
In the electronic unit according to the above [3],
The one wall is
A first portion provided with the engagement portion, a second portion offset in a direction closer to the circuit board than the first portion, and a third portion connecting the first portion and the second portion. Have
The pressing piece,
Is configured to extend in a cantilever shape from the third portion,
Be an electronic unit.
[5]
In the electronic unit according to any one of [2] to [4],
The first housing is
Having a storage portion that is received so as to surround the pressing piece and regulates that the pressing piece is displaced in a direction different from the assembling direction,
Be an electronic unit.
[6]
In the electronic unit according to any one of the above [2] to [5],
The terminal holder,
It has a concave portion depressed in a direction away from the pressing piece along the assembling direction, and has the pressed portion inside the concave portion.
Be an electronic unit.

  According to the electronic unit having the configuration described in [1], in a state where the electronic unit is assembled, the pressing piece extending from the second housing elastically presses the terminal holder abutting on the first housing. ing. This elastic pressing can be realized by elastic deformation (such as bending) of the pressing piece. Therefore, rattling between the first housing and the terminal holder hardly occurs. Further, according to the law of action and reaction, the second housing that presses the terminal holder is also elastically pressed from the terminal holder via the pressing piece, so that there is play between the second housing and the terminal holder. Sticking hardly occurs. As a result, the circuit board to which the terminal holder is fixed is less likely to generate vibration due to rattling of the components. Therefore, the electronic unit of this configuration can suppress rattling of each component, even when an external force such as vibration is applied from the outside during use, as compared with the conventional electronic unit.

  According to the electronic unit having the configuration of the above [2], in the mounting direction, the interval between the engaging portion of the second housing and the pressing piece is such that the engaged portion of the first housing and the pressed portion of the terminal holder are pressed. And smaller than the interval. Therefore, when assembling the first housing and the second housing, the pressing piece of the second housing is pressed against the pressed portion of the terminal holder, so that the length of the pressing piece in the mounting direction is shortened. The engaging portion of the second housing is engaged with the engaged portion of the first housing while performing the same. Thus, a state in which the elastic piece of the second housing elastically presses the pressed portion of the terminal holder can be realized.

  According to the electronic unit having the configuration described in [3], the engaging portion and the pressing piece of the second housing are provided on the same wall surface of the second housing. Thus, the structure of the second housing can be simplified and the electronic unit can be reduced in size, as compared with the case where the engaging portion and the pressing piece are provided on different wall surfaces.

  According to the electronic unit having the configuration of the above [4], the wall portion of the second housing has the first portion provided with the engagement portion, and the second portion offset in a direction closer to the circuit board than the first portion. It has a stepped structure having a third portion connecting the first portion and the second portion. The pressing piece extends in a cantilever form from the step (that is, the third part). Thereby, compared with the case where the cantilever-shaped pressing piece is extended and bent from the first portion or the second portion of the wall surface to face the terminal holder, a simple shape in which the pressing piece extends along the assembling direction is provided. Will have. As a result, for example, unintended stress concentration and the like can be suppressed, and the durability of the pressing piece can be improved. In other words, a larger elastic force can be exerted from the pressing piece to the pressed portion of the terminal holder. Therefore, the electronic unit of this configuration can more appropriately suppress rattling of each component even when external force such as vibration is applied from outside during use.

  According to the electronic unit having the above configuration [5], the pressing piece of the second housing is surrounded by the storage portion of the first housing, and is restricted from being displaced in a direction different from the mounting direction. This makes it possible to more reliably maintain a state in which the pressing pieces appropriately press the pressed portions of the terminal holder. As a result, in the electronic unit of this configuration, even when external force such as vibration is applied from the outside during use, it is possible to more appropriately suppress the backlash of each component.

  According to the electronic unit having the configuration of [6], the pressed portion is provided inside the concave portion of the terminal holder, and the pressing piece extending from the second housing presses the pressed portion. Therefore, for example, as compared with the case where the pressed portion is provided in a portion other than the concave portion of the terminal holder, the pressing piece can be made longer by the amount of the concave portion. As a result, for example, the amount of deformation of the pressing piece during assembly can be increased. In other words, the workability of assembling can be improved without increasing the size of the electronic unit.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic unit which can suppress rattling of each part even if external force, such as a vibration, is applied from the outside at the time of use can be provided.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through embodiments for carrying out the invention described below (hereinafter, referred to as “embodiments”) with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of the electronic unit according to the first embodiment. FIG. 2 is a perspective view of the electronic unit according to the first embodiment after the assembly is completed. 3A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 3B is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 3C is a dimensional relationship around the pressing piece. FIG. FIG. 4A is a cross-sectional view taken along line CC of FIG. 3B, and FIG. 4B is a cross-sectional view taken along line DD of FIG. 4A. FIG. 5 is a cross-sectional view taken along the line EE of FIG. FIGS. 6A to 6E are cross-sectional views taken along line FF of FIG. 5, and are diagrams for explaining a procedure when assembling the connector cover and the main cover. FIG. 7A is a perspective view of a terminal holder fixed to a circuit board in the electronic unit according to the second embodiment as viewed from the rear side, and FIG. 7B is a G section of FIG. 7A. FIG. FIG. 8A is a diagram corresponding to FIG. 3B in the electronic unit according to the second embodiment, and FIG. 8B is an enlarged view of a portion H in FIG. 8A.

<First embodiment>
Hereinafter, an electronic unit according to a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the electronic unit 1 according to the first embodiment of the present invention includes a circuit board 10, a terminal holder 20 fixed to the circuit board 10, a connector cover 30 assembled to the terminal holder 20, a connector A main cover 40 to be assembled to the cover 30. In the electronic unit 1, the circuit board 10 and the terminal holder 20 are accommodated in a housing formed by the connector cover 30 and the main cover 40 assembled together.

  Hereinafter, for convenience of explanation, as shown in FIG. 1, a front-rear direction, a vertical direction, a width direction, front, rear, upper, and lower are defined. The front-rear direction, the vertical direction, and the width direction are orthogonal to each other. The front-back direction coincides with the fitting direction of the electronic unit 1 (more specifically, the connector cover 30) and the mating housing of the mating connector, and the front side of the mating direction (approaching the mating connector). Side) corresponds to the front side, and the mating direction releasing side (side away from the mating connector) corresponds to the rear side. Hereinafter, members constituting the electronic unit 1 will be described in order.

  First, the circuit board 10 will be described. As shown in FIG. 1, the circuit board 10 made of resin is a rectangular flat board, and a plurality of electronic components (not shown) are provided on the upper surface of the circuit board 10. Further, as shown in FIG. 3A, a plurality of L-shaped terminals 11 are also provided on the circuit board 10. In this example, the L-shaped terminal 11 includes a bar-shaped base 12 extending vertically and a bar-shaped tip 13 extending forward from the upper end of the base 12. It is fixed and electrically connected to a conductive pattern (not shown) formed on the circuit board 10.

  Next, the terminal holder 20 will be described. As shown in FIG. 1, the resin-made terminal holder 20 is fixed on the upper surface of the circuit board 10 by the fixing portions 21 provided integrally at a plurality of locations (in this example, two locations at both ends in the width direction). It is fastened and fixed using bolts 26 (see FIG. 3B). The terminal holder 20 includes an upright wall portion 22 that rises upward from the upper surface of the circuit board 10 and that is continuous in the width direction.

  A plurality of terminal holding holes 23 (see FIG. 3A) for holding the plurality of terminals 11 are formed in the upright wall portion 22 so as to penetrate in the front-rear direction. By inserting the tip portions 13 of the plurality of terminals 11 into the corresponding terminal holding holes 23, respectively, the terminal holder 20 fixed to the circuit board 10 extends the plurality of terminals 11 forward with the tip portions 13 forward. Hold in orientation.

  At both ends in the width direction of the upper surface of the standing wall portion 22 (that is, at two places), a concave portion 24 that opens upward, is depressed downward, and penetrates in the front-rear direction is provided. A projection 25 protruding inward in the width direction from the inner wall is provided integrally (see FIG. 1). In the first embodiment, the front end face of the projection 25 is flush with the front end face of the recess 24, and the rear end face of the projection 25 is flush with the rear end face of the recess 24. The functions of the recess 24 and the projection 25 will be described later.

  Next, the connector cover 30 will be described. As shown in FIG. 1, the resin-made connector cover 30 has a substantially rectangular peripheral wall portion 31 extending in the width direction when viewed from the front-rear direction, and has a substantially rectangular parallelepiped shape as a whole. At a predetermined position of the connector cover 30, a connector insertion hole 32 having a rectangular shape as viewed from the front, which is opened forward and closed at the rear, is formed. The connector insertion hole 32 is a hole for inserting a mating housing.

  On the rear wall (bottom wall) of the connector insertion hole 32, a plurality of terminal insertion holes 33 (see FIG. 3A) for inserting the plurality of terminals 11 are formed so as to penetrate in the front-rear direction. . In the assembly completed state of the electronic unit 1, the distal ends 13 of the plurality of terminals 11 are inserted into the corresponding terminal insertion holes 33, respectively, so that the distal ends 13 (male terminals) of the plurality of terminals 11 are inserted into the connector insertion holes. 32. Thus, when the mating housing is inserted into the connector insertion hole 32, the mating terminal (female terminal) and the terminal 11 (male terminal) housed in the mating housing are connected, and the mating connector and the electronic unit are connected. 1 are electrically connected.

  In the connector cover 30, a board receiving hole 34 having a rectangular shape as viewed from the rear, which is opened rearward and closed at the front, is formed below the connector insertion hole 32. ) And FIG. 3 (b)). The board accommodation hole 34 is a hole for accommodating the front end portion of the circuit board 10 in a state where the assembly of the electronic unit 1 is completed.

  At the upper part of the rear wall of the connector cover 30, at a plurality of locations (two locations) corresponding to the plurality of (two) projections 25 of the terminal holder 20, the columnar storage portions 35 project backward. They are provided integrally (see FIGS. 1, 3 (b) and 4 (a)). Each storage portion 35 is formed with a groove portion 36 that opens outward in the width direction, is depressed inward in the width direction, extends in the front-rear direction, and is opened forward (see FIG. 4B). The groove part 36 of the storage part 35 is a part for receiving the projection part 25 of the terminal holder 20 and the pressing piece 45 (described later) so as to surround the electronic unit 1 in the assembled state.

  Locking projections 37 protruding outward are integrally formed at the widthwise central portions (ie, two places) of the upper wall and the lower wall of the peripheral wall portion 31 of the connector cover 30. The locking projection 37 engages with a locking hole 46 (described later) of the main cover 40 when the electronic unit 1 is assembled.

  Next, the main cover 40 will be described. As shown in FIG. 1, the main cover 40 made of resin is a rectangular cylindrical box-shaped body that is opened forward and closed at the rear. The front opening of the main cover 40 has a shape corresponding to the peripheral wall 31 of the connector cover 30, and the main cover is formed such that the front end defining the front opening of the main cover 40 overlaps the outside of the peripheral wall 31. 40 and the connector cover 30 can be assembled (fitted).

  The upper wall 41 of the main cover 40 has a flat plate-shaped first portion 42 occupying the front region of the upper wall 41, and a flat plate-shaped portion occupying the rear region of the upper wall 41 and offset downward with respect to the first portion 42. It is composed of a second portion 43 and a third portion 44 connecting the first and second portions 42, 43 (see also FIGS. 3A and 3B).

  As shown in FIGS. 3B and 4A, the upper wall 41 has a plurality of (two) positions corresponding to the plurality (two) of the protrusions 25 of the terminal holder 20, respectively. A pressing piece 45 extending forward from the lower surface (inner surface) of the three portions 44 in a cantilever shape is provided integrally. The function of the pressing piece 45 will be described later.

  At the front end of the main cover 40, as shown in FIG. 1, at each of a plurality of (two) circumferential positions corresponding to the plurality of (two) locking protrusions 37 of the connector cover 30, locking protrusions are respectively provided. A locking hole (through hole) 46 for locking the 37 is formed.

  As shown in FIG. 3C, the assembled state of the electronic unit 1, that is, the protrusion 25 of the terminal holder 20 and the pressing piece 45 of the main cover 40 are received by the storage portion 35 of the connector cover 30, and the terminal When the holder 20 and the connector cover 30 are in contact with each other in the front-rear direction, the distance L1 between the locking hole 46 of the main cover 40 and the pressing piece 45 in the front-rear direction is equal to the locking protrusion 37 of the connector cover 30 and the terminal. It is slightly smaller than the distance L2 between the holder 20 and the projection 25.

In the foregoing, the members constituting the electronic unit 1 have been described.
Next, a procedure for assembling the electronic unit 1 by assembling the connector cover 30 and the main cover 40 will be described with reference to FIG.

  First, as shown in FIG. 6A, the connector cover 30 is attached to the terminal holder 20 fixed to the circuit board 10 from the front side. At this time, the front end of the circuit board 10 is inserted into the board receiving hole 34 of the connector cover 30, and the tip 13 of the terminal 11 held by the terminal holder 20 is inserted into the terminal insertion hole 33 of the connector cover 30. By inserting the corresponding storage portions 35 of the connector cover 30 into the respective recesses 24 of the terminal holder 20, the respective projections 25 of the terminal holder 20 are respectively received in the groove portions 36 of the corresponding storage portions 35 of the connector cover 30. . In the front-back direction, even if the connector cover 30 is in contact with the terminal holder 20 (the standing wall portion 22), there is a gap between the connector cover 30 and the terminal holder 20, as shown in FIG. Is also good.

  From this state, as shown in FIG. 6A, the main cover 40 is moved rearward with respect to the fixed connector cover 30 so that the front end of the main cover 40 overlaps the outer peripheral wall 31 of the connector cover 30. As a result, the fitting of the main cover 40 to the connector cover 30 is started. Thereafter, the main cover 40 is pressed forward from the rear side and moves forward (approaching the fixed connector cover 30), whereby the fitting proceeds.

  As the fitting progresses, as shown in FIG. 6B, each pressing piece 45 of the main cover 40 enters and is received by the corresponding groove 36 of the storage section 35 of the connector cover 30, and the pressing piece 45 is received. , Comes into contact with the projection 25 of the terminal holder 20 already received in the groove 36 of the storage section 35.

  At the stage when the pressing piece 45 comes into contact with the projection 25, the front end of the main cover 40 is on the engagement projection 37 of the connector cover 30, but the engagement hole 46 is in contact with the engagement projection 37. Has not reached the lockable position. After the stage in which the pressing piece 45 contacts the projection 25, the terminal holder 20 approaches the connector cover 30 by the pressing of the projection 25 by the pressing piece 45 as the fitting progresses (moves forward). Do).

  As the fitting further proceeds, the terminal holder 20 comes into contact with the connector cover 30 in the front-rear direction as shown in FIG. Also at this stage, as described above, due to the relationship of “spacing L1 <spacing L2” (see FIG. 3C), the locking hole 46 reaches the position where the locking projection 46 can be locked with the locking projection 37. Not reached. Therefore, the front end of the main cover 40 is maintained in a state of riding on the locking projection 37 of the connector cover 30.

  In this state, when the main cover 40 is further pressed forward from the rear side, the pressing piece 45 is elastically deformed (for example, curved), so that the length in the front-rear direction is shortened, and the upper wall of the main cover 40 is pressed. 41 (especially, the second portion 43 near the third portion 44) is slightly upwardly curved, so that the fitting further proceeds. As a result, as illustrated in FIG. 6D, the locking hole 46 reaches a position where the locking hole 46 can be locked with the locking protrusion 37.

  When the locking hole 46 reaches a position where it can be locked with the locking projection 37, the locking projection 37 is locked in the locking hole 46 as shown in FIG. Thus, the state in which the front end of the main cover 40 rides on the locking projection 37 is eliminated, and the assembly of the electronic unit 1 (the assembly of the connector cover 30 and the main cover 40) is completed.

<Second embodiment>
Next, an electronic unit 2 according to a second embodiment of the present invention will be described with reference to FIGS. The electronic unit 1 according to the second embodiment differs from the electronic unit 1 according to the first embodiment only in the shape of the concave portion 24 and the protrusion 25 of the terminal holder 20 and the shape of the pressing piece 45 of the main cover 40. The definitions in the front-back direction, up-down direction, width direction, front, rear, upper, and lower in the electronic unit 2 according to the second embodiment are the same as those in the first embodiment (see FIG. 1).

  Specifically, in the first embodiment, as described above, the front end face of the projection 25 is flush with the front end face of the recess 24, and the rear end face of the projection 25 is flush with the rear end face of the recess 24. (See FIG. 1). On the other hand, in the second embodiment, as shown in FIGS. 7A and 7B, a concave portion 27 that opens rearward and is depressed forward is formed on the inner wall in the width direction outside of the concave portion 24. The protrusion 25 protrudes inward in the width direction from the bottom wall of the recess 27. As a result, the front end surface of the protrusion 25 (the surface on the back side of the paper surface in FIG. 7) is flush with the front end surface of the recess 24 as in the first embodiment, while the rear end surface of the protrusion 25 (FIG. 7). (The surface on the near side of the paper surface in FIG. 7) is located forward (toward the paper surface in FIG. 7) from the rear end surface of the concave portion 24 by the depth of the concave portion 24.

  As described above, in the second embodiment, the rear end surface of the protrusion 25 is located forward of the rear end surface of the concave portion 24 as compared with the first embodiment, as shown in FIGS. As is clear from the comparison of FIG. 8A, the extension length of the pressing piece 45 extending forward is longer. As a result, the deformation of the pressing piece 45 at the time of assembly can be increased while maintaining the size of the electronic unit 2 equal to that of the electronic unit 1 as compared with the first embodiment, and the terminal holder 20, the connector cover 30, and the main cover The workability when assembling the forty can be improved.

  As described above, according to the electronic units 1 and 2 according to the respective embodiments of the present invention, (the projection 25 of) the terminal holder 20 abutting on the connector cover 30 when the assembly of the electronic units 1 and 2 is completed. A pressing piece 45 extending from the cover 40 presses elastically. In this elastic pressing, the pressing piece 45 is elastically deformed (curved), and the upper wall 41 of the main cover 40 (particularly, the second portion 43 near the third portion 44) is slightly curved upward. It is realized by.

  This makes it difficult for rattling between the connector cover 30 and the terminal holder 20 to occur. Further, the main cover 40 pressing the terminal holder 20 is also elastically pressed from the terminal holder 20 via the pressing piece 45 according to the law of action and reaction. It is hard to cause backlash. As a result, the circuit board 10 to which the terminal holder 20 is fixed is less likely to generate vibration due to rattling of the components. Therefore, the electronic units 1 and 2 can suppress rattling of each component as compared with a conventional electronic unit even when an external force such as vibration is applied from outside during use.

  Furthermore, according to the electronic units 1 and 2 according to each embodiment, the distance L1 between the locking hole 46 of the main cover 40 and the pressing piece 45 in the front-rear direction (assembly direction) is determined by the locking protrusion of the connector cover 30. It is smaller than the distance L2 between the protrusion 37 of the terminal holder 20 and the protrusion 37 (see FIG. 3C). At this time, when assembling the connector cover 30 and the main cover 40, the pressing piece 45 of the main cover 40 is pressed against the protrusion 25 of the terminal holder 20, so that the length of the pressing piece 45 in the front-rear direction is reduced. The locking holes 46 of the main cover 40 are engaged with the locking projections 37 of the connector cover 30 while being equalized. Thus, a state where the pressing piece 45 of the main cover 40 elastically presses the protrusion 25 of the terminal holder 20 can be realized.

  Furthermore, according to the electronic units 1 and 2 according to each embodiment, the locking hole 46 and the pressing piece 45 of the main cover 40 are provided on the same upper wall 41 of the main cover 40. Thus, the structure of the main cover 40 can be simplified as compared with the case where the locking hole 46 and the pressing piece 45 are provided on different wall surfaces, and the electronic units 1 and 2 can be reduced in size.

  Further, according to the electronic units 1 and 2 according to each embodiment, the upper wall 41 of the main cover 40 has the first portion 42 in which the locking hole 46 is provided and the direction in which the upper portion 41 is closer to the circuit board 10 than the first portion 42 is. It has a stepped structure having a (downward) offset second portion 43 and a third portion 44 connecting the first portion 42 and the second portion 43. The pressing piece 45 extends in a cantilever shape from the step (the third portion 44). Thereby, the pressing piece 45 extends in the front-rear direction (assembly direction) as compared with the case where the pressing piece 45 extends and bends from the first portion 42 or the second portion 43 of the upper wall 41 to face the terminal holder. It has a simple shape. As a result, for example, unintended concentration of stress can be suppressed, and the durability of the pressing piece 45 can be improved. In other words, a greater elastic force can be exerted from the pressing piece 45 to the protrusion 25 (the pressed portion) of the terminal holder 20. Therefore, the electronic units 1 and 2 can more appropriately suppress rattling of each part even when external force such as vibration is applied from outside during use.

  Furthermore, according to the electronic units 1 and 2 according to each embodiment, the pressing piece 45 of the main cover 40 is surrounded by the groove 36 of the storage section 35 of the connector cover 30 and is different from the front-rear direction (assembly direction). Is restricted. Thereby, the state in which the pressing piece 45 appropriately presses the protrusion 25 of the terminal holder 20 can be more reliably maintained. As a result, the electronic units 1 and 2 can more appropriately suppress rattling of each component even when an external force such as vibration is applied from outside during use.

  Further, according to the electronic unit 2 according to the second embodiment, the projection 25 is provided inside the concave portion 27 (see FIG. 7) of the terminal holder 20, and the pressing piece 45 extending from the main cover 40 holds the projection 25. Press. Therefore, as compared with the electronic unit 1 according to the first embodiment, the pressing piece 45 is longer by the amount that the concave portion 27 is depressed. As a result, for example, the amount of deformation of the pressing piece 45 during assembly can be increased. In other words, while the size of the electronic unit 2 is the same as that of the electronic unit 1, workability when assembling the terminal holder 20, the connector cover 30, and the main cover 40 can be improved.

  Further, according to the electronic units 1 and 2 according to each embodiment, the main unit is in a state where the connector cover 30 and the main cover 40 are assembled (the state where the locking projections 37 are locked in the locking holes 46). It has been found by tests and studies by the inventor that the maximum stress occurs in the second portion 43 near the step portion (the third portion 44) provided on the upper wall 41 of the cover 40. Thereby, when assembling the main cover 40 to a relay box or the like, it is possible to avoid that the outermost shape of the main cover 40 changes and the main cover 40 becomes difficult to assemble.

<Other forms>
Note that the present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. In addition, the material, shape, size, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  In each of the above embodiments, the pressing piece 45 is provided on the step portion (the third portion 44) of the upper wall 41. On the other hand, the pressing piece 45 may be provided on the first portion 42 or the second portion 43 of the upper wall 41.

  Further, in each of the above embodiments, the locking hole 46 and the pressing piece 45 of the main cover 40 are provided on the same upper wall 41 of the main cover 40. On the other hand, the locking hole 46 and the pressing piece 45 of the main cover 40 may be provided on different wall surfaces of the main cover 40.

Here, the features of the embodiments of the electronic units 1 and 2 according to the present invention described above will be briefly summarized and listed below in [1] to [6].
[1]
A circuit board (10) provided with electronic components and input / output terminals (11);
A terminal holder (20) fixed to the circuit board (10) and holding the terminal (11);
A first housing (30) assembled to abut on the terminal holder (20);
A second housing (40) assembled to the first housing (30) so as to sandwich the terminal holder (20) between the first housing (30) and the first housing (30); A pressing piece (45) that engages with the first housing (30) so as to restrict the movement of the third housing (30) away from the terminal holder (20) and extends from the second housing (40). The terminal holder (20) and the first housing (30) are kept in contact with each other by elastically pressing the terminal holder (20) against the first housing (30) via And a second housing (40) configured to
Electronic unit (1).
[2]
In the electronic unit (1) according to the above [1],
The first housing (30) includes:
Abutting on the terminal holder (20) while being pressed along a predetermined assembling direction;
The second housing (40) includes:
The engaging portion (46) provided on the second housing (40) engages with the engaged portion (37) of the first housing (30), and the terminal piece is held by the pressing piece (45). (20) is pressed against the pressed portion (25), and the distance (L1) between the engaging portion (46) and the pressing piece (45) in the assembling direction is equal to the distance (L1) in the assembling direction. The distance (L2) between the engaging point (37) and the pressed point (25) is configured to be narrower.
Electronic unit (1).
[3]
In the electronic unit (1) according to the above [2],
The second housing (40) includes:
A plurality of wall surfaces that define a rectangular cylindrical space for accommodating the circuit board (10) and the terminal holder (20) separately from the outside and the first housing (30);
The engagement portion (46) includes:
Provided on one wall surface (41) of the second housing (40);
The pressing piece (45)
Provided so as to extend from the one wall surface (41);
Electronic unit (1).
[4]
In the electronic unit (1) according to the above [3],
The one wall surface (41)
A first portion (42) provided with the engagement portion (46), a second portion (43) offset toward the circuit board (10) from the first portion (42), A portion (42) and a third portion (44) connecting the second portion (43);
The pressing piece (45)
It is configured to extend in a cantilever manner from the third portion (44);
Electronic unit (1).
[5]
In the electronic unit (1) according to any one of the above [2] to [4],
The first housing (30) includes:
A storage portion (35) for receiving the pressing piece (45) so as to surround the pressing piece (45) and restricting the pressing piece (45) from being displaced in a direction different from the assembling direction;
Electronic unit (1).
[6]
In the electronic unit according to any one of the above [2] to [5],
The terminal holder (20)
A concave portion (27) depressed in a direction away from the pressing piece (45) along the assembling direction, and having the pressed portion (25) inside the concave portion (27);
Electronic unit (1).

DESCRIPTION OF SYMBOLS 1 Electronic unit 10 Circuit board 11 Terminal 20 Terminal holder 25 Projection part (pressed part)
27 recess 30 connector cover (first housing)
35 Storage section 37 Locking projection (engaged location)
40 Main cover (second housing)
41 Upper wall (one wall)
42 first part 43 second part 44 third part 45 pressing piece 46 locking hole (engaging part)

Claims (6)

A circuit board on which electronic components and input / output terminals are provided;
A terminal holder fixed to the circuit board and holding the terminal,
A first housing assembled to abut the terminal holder;
A second housing assembled to the first housing so as to sandwich the terminal holder between the first housing and the first housing, wherein the second housing restricts movement of the first housing away from the terminal holder; The terminal holder and the first housing by elastically pressing the terminal holder against the first housing via a pressing piece extending from the second housing. A second housing configured to maintain a state in which the first housing is in contact with the first housing.
Electronic unit. The electronic unit according to claim 1,
The first housing is
Abutting on the terminal holder while being pressed along a predetermined assembling direction,
The second housing,
The engaging portion provided on the second housing engages with the engaged portion of the first housing, the pressing piece presses the pressed portion of the terminal holder, and The interval between the engaging portion and the pressing piece is narrower than the interval between the engaged portion and the pressed portion in the assembling direction,
Electronic unit. The electronic unit according to claim 2,
The second housing,
A plurality of wall surfaces that define a rectangular cylindrical space for housing the circuit board and the terminal holder separately from the outside and the first housing,
The engagement portion includes:
Provided on one wall surface of the second housing,
The pressing piece,
Provided to extend from the one wall surface,
Electronic unit. The electronic unit according to claim 3,
The one wall is
A first portion provided with the engagement portion, a second portion offset in a direction closer to the circuit board than the first portion, and a third portion connecting the first portion and the second portion. Have
The pressing piece,
Is configured to extend in a cantilever shape from the third portion,
Electronic unit. In the electronic unit according to any one of claims 2 to 4,
The first housing is
Having a storage portion that is received so as to surround the pressing piece and regulates that the pressing piece is displaced in a direction different from the assembling direction,
Electronic unit. The electronic unit according to any one of claims 2 to 5,
The terminal holder,
It has a concave portion that is depressed in a direction away from the pressing piece along the assembling direction, and has the pressed portion inside the concave portion.
Electronic unit.

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