JP2013073985A - Holding structure of printed substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding structure of a printed substrate capable of holding the printed substrate in a housing without giving distortion.SOLUTION: In a holding structure of a printed substrate which inserts a printed substrate 2 into an extension direction of the printed substrate 2 from an opening 1a of a housing 1 to hold the printed substrate 2 in the housing 1, a first engagement part 23 and a second engagement part 24 which are inclined symmetrically with respect to an insertion direction are provided in a tip part of the printed substrate 2 in its insertion direction, a first locking part 13 having a plurality of projections 123 separated in a thickness direction on an inclination surface 121 in the same direction as the first engagement part 23 and a second locking part 14 having a plurality of projections 124 separated in the thickness direction on an inclination surface 122 in the same direction as the second engagement part 24 which extend in the thickness direction of the printed substrate 2 are provided in a deep part in the housing 1. When the printed substrate 2 is inserted into the housing 1, the first engagement part 23 is engaged with the first locking part 13 and the second engagement part 24 is engaged with the second locking part 14 to hold the tip part of the printed substrate in its insertion direction.

Description

  The present invention relates to a structure for holding a printed circuit board in an internal space of a housing.

  As a conventional printed circuit board holding structure, a printed circuit board on which an electronic component is mounted is formed by a housing formed in a box shape having at least one surface as an opening surface, and a cover for closing the opening surface of the housing. In the printed circuit board holding structure for holding the printed circuit board when housed in a space, the printed circuit board has an arc-shaped cutout portion at a front end of the insertion into the internal space. A first support portion is formed on the rear wall surface facing the opening surface so as to protrude into the internal space corresponding to the notch portion, and the first support portion is contacted with the notch portion. The contact portion has a constricted drum shape, and the cover holds the printed circuit board by bringing the cutout portion of the printed circuit board into contact with the constricted portion of the first support section ( For example, see Patent Document 1 .

Japanese Patent No. 4395767 (pages 6-7, FIGS. 1-7)

  In the related art configured as described above, the arcuate notch formed at the insertion front end of the printed circuit board and the constricted drum-shaped first formed on the rear wall surface without pressing the printed circuit board. The printed circuit board is held by contact with the support portion. On both sides of the constricted portion of the first support portion, there are enlarged diameter portions that gradually increase in diameter as compared with the constricted portion. Therefore, even if the printed circuit board is about to move, the arc-shaped cutout portion of the printed circuit board has an enlarged diameter. The arc-shaped notch provided in the printed circuit board is provided at the rear of the housing, although the effect of being able to hold the circuit board by preventing unnecessary movement of the printed circuit board is obtained. Since it is guided to the most constricted portion of the first support portion, when the printed circuit board is warped due to thermal stress due to soldering after mounting the component, the most constricted portion comes into contact with the first support portion. By being induced, stress on the correction side is applied to the printed circuit board and distortion occurs.

  In addition, in the case where the constricted portion of the first support portion is extended in a columnar shape and an enlarged diameter portion is provided at the tip portion thereof, even if the printed circuit board is warped, the above-described correction distortion occurs. Although there is no, the movable range of the printed circuit board, that is, the play allowance becomes too large by making the printed circuit board and the first support portion arc contact, and when the printed circuit board is shaken by an external impact such as vibration, The stress applied to the lead of a tall component (such as an aluminum electrolytic capacitor) will be amplified, causing problems such as lead breakage. Furthermore, by providing the above allowance, when the printed circuit board is shaken up and down by an external impact, the enlarged diameter part of the first support part and the printed circuit board interfere with each other to generate noise or wear powder. May occur.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a printed circuit board holding structure that can be securely stored and held in a housing without distorting the printed circuit board as much as possible. Yes.

  In the printed circuit board holding structure according to the present invention, a printed circuit board on which electronic components are mounted is inserted in an extending direction of the printed circuit board from an opening provided in a predetermined portion of the housing, and is held inside the housing. A printed circuit board holding structure, wherein a first engagement portion and a second engagement portion that are inclined symmetrically with respect to the insertion direction are provided at a distal end portion in the insertion direction of the printed circuit board. A plurality of convex portions provided at the back portion at intervals in the thickness direction of the printed circuit board on an inclined surface in the same direction as the first engaging portion provided at a position corresponding to the first engaging portion. And a first locking portion having the first engaging portion and an inclined surface in the same direction as the second engaging portion provided at a position corresponding to the second engaging portion with a gap in the thickness direction of the printed circuit board. A second locking portion having a plurality of convex portions, and the printed circuit board is mounted on the housing. The insertion direction of the printed circuit board is caused by engaging the first engagement portion with the first locking portion and engaging the second engagement portion with the second locking portion when inserted into the inside. The tip is held.

  In this invention, the inclined first engaging portion of the printed circuit board is engaged with the inclined first engaging portion of the housing, and the inclined second engaging portion is similarly inclined to the second engaging portion of the housing. Since the tip of the printed circuit board is held by engaging the printed circuit board, the printed circuit board can be stored in the case even when the printed circuit board is deformed due to warpage caused by thermal stress during soldering. In doing so, the printed circuit board and the housing are locked while maintaining the state of the printed circuit board. For this reason, the pressing stress applied to the printed circuit board is reduced, and the printed circuit board can be held with almost no correction distortion.

It is principal part sectional drawing from the upper side which shows schematically the structure of the electronic controller using the holding structure of the printed circuit board concerning Embodiment 1 of this invention. It is the front view which looked at the housing | casing shown by FIG. 1 from the opening part. It is a top view which shows the 1st engaging part and 2nd engaging part vicinity which were provided in the insertion direction front-end | tip part of the printed circuit board shown by FIG. It is an expanded sectional view which shows the 1st locking part and the 2nd locking part vicinity which were provided in the inner back part of the housing | casing shown by FIG. It is the enlarged view which looked at the 1st locking part and the 2nd locking part neighborhood of Drawing 4 from the opening side. It is a side view which shows the example of the curvature of the printed circuit board with which the electronic component and connector member which were shown by FIG. 1 were mounted. It is a figure explaining the other example of the curvature of the printed circuit board shown by FIG. It is operation | movement explanatory drawing when torsional stress is added to the housing | casing shown by FIG. It is principal part sectional drawing from the upper side which shows schematically the structure of the electronic controller using the holding structure of the printed circuit board concerning Embodiment 2 of this invention. It is the front view which looked at the housing | casing shown by FIG. 9 from the opening part. It is principal part sectional drawing from the upper side which shows schematically the structure of the electronic controller using the holding structure of the printed circuit board concerning Embodiment 3 of this invention. It is a principal part top view which shows the 1st, 2nd engaging part of the insertion direction front-end | tip part of the printed circuit board shown by FIG.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of an essential part from above schematically showing a configuration of an electronic control device for a vehicle using a printed circuit board holding structure according to Embodiment 1 of the present invention, and FIG. 2 is shown in FIG. FIG. 3 is a front view of the housing as viewed from the opening, and FIG. 3 is a top view showing the vicinity of the first engagement portion and the second engagement portion provided at the front end portion in the insertion direction of the printed board shown in FIG. FIG. 5 is an enlarged cross-sectional view showing the vicinity of the first locking portion and the second locking portion provided in the inner back portion of the housing shown in FIG. 1, and FIG. 5 is the first locking portion and the second locking portion in FIG. It is the enlarged view which looked at the stop part vicinity from the opening part side. In the figure, the electronic control device includes a housing 1 having an opening 1a in a predetermined portion, a printed circuit board 2 in which an electronic component 21 is mounted and accommodated in the housing 1, and a rear end portion in the insertion direction of the printed circuit board 2. A connector member 22 that is attached to the left end of FIG. 1 and also serves as a lid for the opening 1a is provided.

  As shown in FIGS. 1 and 2, the casing 1 is a rectangular parallelepiped box, and the opening 1a is formed such that a predetermined surface forming the height direction of the rectangular parallelepiped is opened. The printed circuit board 2 is inserted in the right direction of FIG. 1 in the extending direction of the printed circuit board 2 from the opening 1a, and the housing is formed by the printed circuit board holding structure of the present invention, which will be described later, in the final part of the process of completing the insertion. 1 is held and fixed. A first engagement portion 23 and a second engagement portion 24 formed by substantially V-shaped notches as shown in FIG. 3 are inserted in the width direction central portion at the distal end portion of the printed board 2 in the insertion direction. As viewed from the left and right. The first engaging portion 23 is configured to include one inclined surface of the V-shaped notch portion, and the second engaging portion 24 includes the other inclined surface of the V-shaped notched portion.

  On the other hand, as shown in FIGS. 2, 4, and 5, the back wall 11 side (the right side of FIG. 1) is located at the position corresponding to the V-shaped notch in the back wall 11 at the back of the inside of the housing. 2) and is formed by using a columnar portion 12 that extends from the upper surface to the lower surface in FIG. The 1st latching | locking part 13 and the 2nd latching | locking part 14 which each engage with the 2 engaging part 24 are provided. The first locking portion 13 extends in the direction of the opening 1a parallel to the extending direction of the printed circuit board at an equal interval in the thickness direction of the printed circuit board 2 on one inclined surface 121 of the columnar section 12 and the inclined surface 121. It is comprised by the some convex part 123 (123a-123e) projected in this way. The second locking portion 14 includes the other inclined surface 122 of the columnar portion 12, and a plurality of convex portions 124 that protrude from the inclined surface 122 in the thickness direction of the printed board 2 in the same manner as the convex portion 123. (124a to 124e).

  The first locking portion 13 and the second locking portion 14 including the columnar portion 12 can be configured integrally with the housing 1 when the housing 1 is formed of, for example, a casting resin. You may comprise. As shown in FIG. 5, the left and right convex portions 123 and 124 have the same left and right spacing in the thickness direction of the printed circuit board 2 (up and down direction in FIG. 5), and one (left side) of the convex portions adjacent to each other in the vertical direction. It is installed asymmetrically so that the center of the other (right) convex portion is located at the center. The protrusions 123 and 124 protrude at a substantially uniform height along the inclined surfaces 121 and 122, and the vertical direction in FIG. 2 of the first engagement portion 23 or the second engagement portion 24 of the printed circuit board 2. Regulate the movement of It should be noted that the vertical dimensions of the convex portions 123a to 123e and 124a to 124e are exaggerated and are actually formed sufficiently thinner than the thickness of the printed circuit board 2.

  Incidentally, the vertical dimension L in the drawing between the left and right convex portions in FIG. 5, for example, between the left convex portion 123 c and the right convex portion 124 c in the drawing is larger than the thickness of the printed circuit board 2. Therefore, when the printed circuit board 2 is inserted in the portion A of FIG. 5 in a substantially horizontal state, the inclined first engaging portion 23 and second engaging portion 24 of the printed circuit board 2 are formed on the upper convex portion 124c. And the lower convex portion 123c easily come into contact with the columnar portion 12 so as to sandwich the inclined surfaces 121 and 122 therebetween. The movement in the vertical direction is restricted by the convex portion 124 c and the convex portion 123 c, and the distal end portion in the insertion direction of the printed board 2 is held with respect to the housing 1. In this state, a predetermined clearance is formed between the printed board 2 and the convex portion 124c or the convex portion 123c.

  It should be noted that the tip of the printed circuit board 2 in the insertion direction is warped due to stress due to soldering or the like. For example, the left side in FIG. 5 is inclined upward and the right side is inclined downward or vice versa. In this case, when the printed circuit board 2 is inserted into the housing 1, the first engagement portion 23 is located between one of the projections and depressions of the first locking portion 13, for example, between the projections 123c and 123d. By being engaged with the inclined surface 121 that is a recess, the second engaging portion 24 is engaged with one of the irregularities of the second locking portion 14, for example, the inclined surface 122 that is a recess between 124c and 124d. The front end of the printed board 2 in the insertion direction is held in an inclined state.

  In short, the first engagement portion 23 is engaged with the first engagement portion 13 and the second engagement portion 24 is engaged with the second engagement portion 14 regardless of the deformation of the distal end portion in the insertion direction of the printed circuit board 2. As a result, the distal end portion of the printed board 2 in the insertion direction and the columnar portion 12 are engaged in a cross shape, and the distal end portion of the printed board 2 in the insertion direction is held by the housing 1. The first and second engaging portions 23 and 24 at the distal end in the insertion direction and the first and second engaging portions 13 and 14 are easily engaged with each other when the printed circuit board 2 is inserted. Chamfering such as processing at least one of the edge portions of the projecting end portions of the first and second engaging portions 23 and 24 and the convex portions 123a to 123e and 124a to 124e, for example, into a taper shape or R (curved surface). It is preferable that By performing this processing, when the printed circuit board 2 is inserted into the housing 1, the first and second engaging portions 23 and 24 at the distal end in the insertion direction are naturally connected to the first and second engaging portions 13 and 14. Be guided.

  On the other hand, on the outer peripheral part of the connector member 22 provided at the rear end part in the insertion direction of the printed circuit board 2, the holding part 22a made of a convex part is provided at each of the right and left height direction central parts that are opposite to each other, On the inner wall surface of the opening portion 1a of the housing 1, there are provided fixing portions 15 formed of concave portions that respectively engage with the holding portions 22a. The printed circuit board 2 is guided when inserted into the housing 1 by the engagement between the holding portion 22a of the connector member 22 and the fixing portion 15 of the housing 1, and the first and second engaging portions 23, 24, The posture of the printed circuit board 2 is adjusted before the first and second engaging portions 13 and 14 are engaged, and the rear end portion in the insertion direction of the printed circuit board 2 is held after the insertion is completed. Eventually, in the first embodiment, the printed circuit board 2 is held by the housing 1 at a total of three points: two at the rear end in the insertion direction and one at the center in the front end. In addition, about the connection terminal group of the connector member 22, mounting components other than the electronic component 21 of the printed circuit board 2, etc., and a fixing part and fixing means for fixing the housing 1 in the engine room or the vehicle compartment of the vehicle Is not shown.

  Next, the operation of the first embodiment configured as described above will be described with reference to FIGS. 6 is a side view showing an example of the warp of the printed board shown in FIG. 1, and FIG. 7 is a view showing another example of the warp of the printed board shown in FIG. 8 is an explanatory diagram seen through from the fitting surface of the connector member that fits the connector, and FIG. 8 is an operation explanatory diagram when a torsional stress is applied to the housing shown in FIG. The printed circuit board 2 immediately after the electronic component 21 and the connector member 22 are mounted and soldered on the printed circuit board 2 is warped 2A or 2B at the end face of the printed circuit board 2 as indicated by a broken line in FIG. There is a case to do.

  Further, when the printed circuit board 2 immediately after soldering is seen through the connector member from the opening 1a side, the printed circuit board 2 is subjected to thermal stress during soldering as shown in a broken line in FIG. , The warp may be 2D. There can also be a combined deformation of FIGS. The connector member 22 shown in FIG. 7 shows a case where a terminal group (not shown) is divided into four blocks 22A, 22B, 22D, and 22E.

  The printed circuit board 2 may have various warpages as exemplified in FIGS. 6 and 7 due to thermal stress caused by soldering. In the first embodiment, when the printed board 2 is inserted into the housing 1, the posture of the printed board 2 is adjusted by the engagement between the holding portion 22 a of the connector member 22 and the fixing portion 15 of the housing 1. After that, the V-shaped first engaging portion 23 having an open tip which is inclined in a tapered shape of the printed circuit board 2 is inclined on the inclined surface 121 of the first locking portion 13 which is similarly inclined in the tapered shape of the housing 1. The leading end portion of the printed circuit board 2 in the insertion direction is brought into contact with the housing 1 by the second engaging portion 24 that is similarly inclined and contacts the inclined surface 122 of the inclined second locking portion 14 of the housing 1. It engages with the inclined surfaces 121 and 122 of the columnar portion 12.

  The inclined surfaces 121 and 122 are provided with a plurality of convex portions 123a to 123e and 124a to 124e, respectively, but these convex portions are installed apart from each other in the vertical direction (thickness direction of the printed circuit board 2). Since there is a predetermined clearance between the holding portion 22a of the connector member 22 at the rear end portion in the direction and the fixing portion 15 of the housing 1, the front end portion in the insertion direction of the printed circuit board 2 can swing in the vertical direction. The first and second engaging portions 23 and 24 each having a V-shaped notch are either a recess (that is, the inclined surface 121) between the convex portions 123a to 123e and the convex portions 124a to 124e. The first engaging portion 23 is engaged with the first engaging portion 13 and the second engaging portion 24 is engaged with the second engaging portion 14.

  In the process of housing the printed circuit board 2 in the housing 1, since stress is not applied to the printed circuit board 2, the pressure stress applied to the printed circuit board 2 is extremely small, and the state of the printed circuit board 2 is maintained. The first and second engaging portions 23 and 24 at the center of the front end portion in the insertion direction of the printed circuit board 2 and the columnar portion 12 of the back wall 11 portion of the housing 1 are substantially perpendicular to each other. And engaged in a cross shape.

  Further, in the first embodiment, the first engaging portion 23 and the second engaging portion 24 are formed by a substantially V-shaped notch portion provided at the center in the width direction at the distal end portion in the insertion direction of the printed circuit board 2. The first locking portion 13 and the second locking portion 14 are formed using a substantially V-shaped columnar portion 12 provided at a position corresponding to the notch portion in the inner wall 11 inside the housing. The convex portions 123 and 124 constituting the concave and convex portions of the first locking portion 13 and the second locking portion 14 are provided asymmetrically when viewed from the insertion direction of the printed circuit board 2, thereby warping the printed circuit board 2. The right and left convex portions 123 (123a to 123e) and the convex portions 124 (124a to 124e) are locked in the thickness direction of the printed circuit board 2 depending on the degree of inclination and the degree of inclination. Because of this, straightening distortion will occur in the printed circuit board 2. Most without adding, it allows holding the printed circuit board 2 is.

  In addition, as described above, the front end of the printed circuit board 2 in the insertion direction securely supports the printed circuit board with the cross-shaped coupling between the tapered inclined surfaces and the pair of left and right convex portions of the convex portions 123 and 124. Therefore, for example, concerns about vibration of the printed circuit board 2 due to external impacts such as vibration, abnormal noise of sliding interference, and poor connector pin contact due to wear powder are eliminated.

  Next, a case where a torsional stress is applied to the housing 1 will be described with reference to FIG. FIG. 8 schematically shows an enlarged view of the columnar portion 12 provided at one central portion of the rear wall surface of the housing 1. When a torsional stress, for example, a torsion in the direction of arrow B or C in FIG. 8, is applied to the housing 1, the convex portions 123 and 124 on both side surfaces of the columnar portion 12 follow the torsional direction of the housing 1. And the printed circuit board 2 follows the same direction accordingly. For this reason, even when the housing 1 containing the printed circuit board 2 is mounted on a housing mounting surface with no flatness using a mounting bracket (both not shown) or the like, the printed circuit board 2 is directly attached to the printed circuit board 2. The stress is not transmitted, and the front end portion in the insertion direction of the printed circuit board 2 does not sandwich the both end portions in the width direction, so that an inflection point cannot be formed and the stress can be relaxed.

  In the conventional technology as described above, a constricted drum-shaped support portion provided on the rear wall surface of the housing while correcting the printed circuit board 2 when storing the printed circuit board with the warpage or the valley warping in the housing. Since it is induced to the most constricted part, distortion on the correction side is generated in the printed circuit board. Further, if the left and right end surfaces of the printed circuit board are sandwiched and held, the printed circuit board will be distorted on the correction side in the same manner as described above. . In addition, when an attempt is made to store a printed circuit board whose front end in the insertion direction is warped or warped in a case, there is a problem that correction distortion similarly occurs.

  In addition, in the conventional technique for holding a printed circuit board with a constricted drum-shaped support part, the printed circuit board and the drum-shaped support part are in contact with each other at an arc-shaped point. However, when the printed circuit board is shaken up and down by an external impact such as vibration, the printed circuit board and the expanded diameter part of the support part interfere with each other and cause abnormal noise. May occur. In addition, the abrasion powder is generated by the repetition of the interference, and when this abrasion powder enters the connector joint contact portion, there is a risk of contact failure of the connector pin.

  In contrast, in the first embodiment of the present invention, as described above, the printed circuit board 2 on which the connector member 22 provided with the electronic component 21 and the terminal group is warped due to thermal stress during soldering. However, the taper-shaped first engaging portion 23 and the second engaging portion 24 provided on the printed circuit board 2 and the tapered first locking portion provided on the rear wall surface of the housing while maintaining a substantially unchanged state. Since the printed circuit board 2 can be securely held in the housing 1 by connecting the 13 and the second locking portion 14 in a cross shape, no correction distortion is applied to the printed circuit board 2. Further, since the printed circuit board 2 is not slid by an external impact, there is no amplitude stress on the lead portion of the large component, and no interference noise or wear occurs.

  As described above, in the printed circuit board holding structure according to the first embodiment, the distal end portion in the insertion direction of the printed circuit board 2 is a first V-shaped cutout provided at one central portion in the width direction. A plurality of engaging portions 23 and second engaging portions 24 are provided on an inclined surface that is provided in the center in the width direction corresponding to the notch portion in the inner back portion of the housing 1 and is wide on the back side in the insertion direction and narrow on the near side. It is locked by engaging the first locking portion 13 and the second locking portion 14 using the columnar portion 12 provided with the convex portion. Further, the rear end portion in the insertion direction of the printed circuit board 2 has two holding portions 22 a provided at two locations facing the outer peripheral portion of the connector member 22 that closes the opening portion of the housing, and the opening portion of the housing 1. It is held by engaging with a fixed portion 15 formed of two concave portions provided at corresponding portions of the inner wall surface of the portion 1a. The printed circuit board 2 is held by the housing 1 at a total of three points, one at the center in the insertion direction and two at the rear end.

  According to the first embodiment, even when the printed circuit board 2 is deformed due to warpage caused by thermal stress during soldering, the printed circuit board 2 and the housing are accommodated when the printed circuit board 2 is stored in the housing 1. 1 is held while the state of the printed circuit board 2 is maintained, the pressing stress applied to the printed circuit board 2 is reduced, and the printed circuit board 2 can be held with almost no correction distortion. Further, the convex portions 123 and 124 provided on the tapered inclined surfaces 121 and 122 can surely regulate the movement of the printed circuit board 2 in the thickness direction. The concerns about vibration, sliding interference noise, and connector pin contact failure due to wear powder are also eliminated.

  Further, since the plurality of convex portions 123 and 124 in the first and second locking portions 13 and 14 provided on the back wall portion of the housing are provided so as to be alternately left and right without being provided at the symmetrical positions, the flatness Even if the housing 1 is attached to a location where no protrusion is present and a torsional stress is applied to the housing 1, a notch portion provided at one central portion of the connector member 22 and the front end portion of the housing 1 of the printed circuit board 2 in the insertion direction And the convex portions 123 and 124 supported by the printed circuit board 2 provided alternately on the left and right sides of the columnar portion 12 in the twisted direction of the casing 1. In addition, since the printed circuit board 2 also follows the same direction, the inflection point stress is hardly applied to the printed circuit board 2, and it is possible to ensure the reliability of the printed circuit board 2 on which the electronic component 21 is mounted, thereby extending the product life. .

  Furthermore, since the printed circuit board 2 is supported at a total of three locations, one at the front end portion in the insertion direction and the two connector members 22 at the rear end portions, it is necessary to hold the printed circuit board 2 from both end surfaces. In other words, no clamping stress is applied to the printed circuit board 2, and the reliability of the printed circuit board 2 can be ensured. In addition, since the printed circuit board 2 is supported by the outer peripheral portion of the relatively rigid connector member 22 and the inner wall of the opening of the housing 1 even when the housing 1 is attached to a place where the flatness does not appear, the housing 1 Even if a torsional stress is applied to the printed circuit board 1, since the printed circuit board 2 and the connector member 22 follow the twisted direction, the torsional stress is not directly transmitted to the printed circuit board 2, and the reliability of the printed circuit board 2 can be ensured. .

  In addition, the pair of fixing portions 15 formed of concave portions provided to face the inner wall surface of the opening 1a of the housing 1 have a role of guide rails when the printed board 2 is stored, and the printed board 2 can be inserted. Before the first and second engaging portions 23 and 24 at the front end of the direction start to engage at the first and second engaging portions 13 and 14 at the back wall 11 portion, the printed board 2 on which the connector member 22 is mounted The posture is adjusted so that it is not inserted into the housing 1 at an angle. For this reason, the printed circuit board 2 on which the connector member 22 is mounted can be reliably housed and locked in the housing 1, and it is possible to prevent bending stress from being applied to the printed circuit board 2 due to offset insertion, and assembly is easy. Moreover, since the 1st, 2nd latching | locking parts 13 and 14 including the columnar part 12 provided in the back wall 11 part of the housing | casing 1 can be integrally molded at the time of the housing | casing 1 and the connector member 22 shaping | molding, processing cost Can be suppressed.

Embodiment 2. FIG.
FIG. 9 is a cross-sectional view of an essential part from above schematically showing the configuration of the electronic control device using the printed circuit board holding structure according to Embodiment 2 of the present invention, and FIG. 10 shows the casing shown in FIG. It is the front view seen from the opening part. Note that the same or corresponding parts are denoted by the same reference numerals throughout the drawings. In the figure, a holding portion 22b made of a concave portion is provided at the central portion in the thickness direction of the printed circuit board 2 on the outer peripheral surface of the connector member 22, and a convex portion engaging with the holding portion 22b is provided on the inner wall surface of the opening portion 1a of the housing 1. A guide rail-shaped fixing portion 16 made of a portion protrudes. Other configurations are the same as those in the first embodiment.

In the second embodiment, the fixing structure of the connector member 22 and the housing 1 at the rear end in the insertion direction is changed in the holding structure of the printed circuit board 2 with respect to the housing 1.
As described above, even if the fixing structure between the connector member 22 and the housing 1 is changed, the printed circuit board 2 on which the connector member 22 is mounted is prevented from being offset and inserted into the housing 1 at an angle. It is clear that the same operational effects as those of the first embodiment can be expected, such as the fact that the printed circuit board 2 can be securely stored and the bending stress applied to the printed circuit board 2 due to offset insertion can be prevented. In the case of the second embodiment, since the engaging means with the connector member 22 on the housing 1 side is the guide rail-shaped fixing portion 16 made of a convex portion, the case 1 can be handled even when the thickness of the housing 1 is thin. There is.

Embodiment 3 FIG.
FIG. 11 is a cross-sectional view of an essential part from above schematically showing a configuration of an electronic control device using the printed circuit board holding structure according to the third embodiment of the present invention, and FIG. 12 is a diagram of the printed circuit board shown in FIG. It is a principal part top view which shows the 1st, 2nd engaging part of the insertion direction front-end | tip part. In the third embodiment, the engagement portion between the first engagement portion and the first engagement portion is arranged at one corner (lower side in FIG. 11) of the rear wall of the housing. And the second engaging portion are arranged separately on the other corner of the back wall of the housing. As shown in FIG. 12, a first engagement portion 23 </ b> A that is inclined with respect to the insertion direction is provided at one corner in the width direction at the distal end portion in the insertion direction of the printed circuit board 2, and at the other corner portion. A second engaging portion 24A that is symmetrically inclined with respect to the first engaging portion 23A is provided.

  On the other hand, as shown in FIG. 11, at one corner of the back wall 11 of the housing 1, there is an inclined surface 121A inclined in the same direction as the first engaging portion 23A, and the inclined surface 121A has an embodiment. As in FIG. 1, a first locking portion 13 </ b> A including a convex portion 123 </ b> A protruding at an interval in the thickness direction of the printed circuit board 2 is provided. In addition, an inclined surface 122A inclined in the same direction as the second engaging portion 24A is formed at the other corner of the back wall 11, and the inclined surface 122A is formed on the printed board 2 in the same manner as in FIG. 5 of the first embodiment. A second locking portion 14A including a convex portion 124A protruding at an interval in the thickness direction is provided. Other configurations are the same as those in the first embodiment, including that the positions of the protrusions 123A and 124A in the thickness direction of the printed circuit board 2 are shifted and asymmetric.

  In the third embodiment configured as described above, the locking position of the distal end portion in the insertion direction of the printed circuit board 2 is separated in the width direction, so that the printed circuit board 2 is viewed from the front side in the insertion direction of the printed circuit board 2. Even when the left and right end portions are slightly inclined in the vertical direction, the printed circuit board 2 can be locked without being deformed. Since both ends of the printed circuit board 2 in the width direction are locked to the housing 1, it is not suitable for a mounting method in which a torsional stress is applied to the housing 1, but an installation in which no torsional stress is applied. By selecting the method, the pressing stress applied to the printed circuit board 2 is reduced, and an effect that the printed circuit board can be held with almost no correction distortion is obtained.

  In the first to third embodiments, the case in which the positions of the convex portions 123 (123A) and the convex portions 124 (124A) in the thickness direction of the printed board 2 are shifted is described. Needless to say, the number of the convex portions 123 (123A) and 124 (124A) and the use of the printed circuit board holding structure are not limited to those exemplified in the embodiment.

  DESCRIPTION OF SYMBOLS 1 Housing | casing, 1a Opening part, 11 Back wall, 12 Columnar part, 121, 121A Inclined surface, 122, 122A Inclined surface, 123 (123a-123e) Convex part, 123A Convex part, 124 (124a-124e) Convex part, 124A convex portion, 13 first locking portion, 14 second locking portion, 15, 16 fixing portion, 2 printed circuit board, 21 electronic component, 22 connector member, 22a, 22b holding portion, 23, 23A first engaging portion 24, 24A Second engaging portion.

Claims (8)

  A printed circuit board holding structure in which a printed circuit board on which an electronic component is mounted is inserted in an extending direction of the printed circuit board through an opening provided in a predetermined portion of the housing, and is held inside the housing. A first engagement portion and a second engagement portion that are inclined symmetrically with respect to the insertion direction are provided at a distal end portion in the insertion direction of the substrate, and the first engagement portion is provided at an inner back portion of the housing. A first locking portion having a plurality of convex portions provided at intervals in the thickness direction of the printed circuit board on an inclined surface in the same direction as the first engaging portion provided at a position corresponding to the first engaging portion; 2nd latching | locking part which has the some convex part provided in the thickness direction of the said printed circuit board on the inclined surface of the same direction as the said 2nd engagement part provided in the position corresponding to 2 engagement part at intervals. And when the printed circuit board is inserted into the housing, the first engaging portion is The print is characterized in that the front end portion in the insertion direction of the printed circuit board is held by engaging with the first engaging portion and engaging the second engaging portion with the second engaging portion. Substrate holding structure.   The first engagement portion and the second engagement portion are formed by a V-shaped notch portion provided at a center portion in the width direction at the distal end portion in the insertion direction of the printed circuit board. The two locking portions are provided at positions corresponding to the notches in the inner wall of the housing, and are substantially V-shaped columnar portions that are wide on the inner wall side and narrower on the housing opening side. The printed circuit board holding structure according to claim 1, wherein the printed circuit board holding structure is formed using a material.   The first engagement portion is provided at one end portion in the width direction of the front end portion in the insertion direction of the printed circuit board, and the second engagement portion is provided at the other end portion in the width direction. The two locking portions are provided at one end portion and the other end portion in the width direction of the inner back portion of the casing in correspondence with the first engaging portion and the second engaging portion, respectively. The printed circuit board holding structure according to claim 1.   4. The unevenness of the first locking portion and the second locking portion is formed asymmetrically when viewed from the insertion direction of the printed circuit board. Printed circuit board holding structure.   A connector member formed so as to close the opening of the casing at the rear end in the insertion direction of the printed circuit board; and a fixing portion including a convex or a concave is provided in the opening of the casing. A holding portion comprising a concave portion or a convex portion that engages with the fixing portion is provided on the outer peripheral portion, and the rear end portion in the insertion direction of the printed circuit board is held by engagement of the fixing portion and the holding portion. The printed circuit board holding structure according to any one of claims 1 to 4.   6. The printed circuit board holding structure according to claim 5, wherein the fixing portion has a function of a guide rail when the printed circuit board is inserted into the housing.   The printed circuit board holding structure according to claim 1, wherein the first locking portion and the second locking portion are integrally formed with the housing.   The edge part of the protrusion end part of the convex part in the first locking part and the second locking part, or the first engaging part and the second engaging part are chamfered. The printed circuit board holding structure according to any one of claims 1 to 7.

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