JPH11284375A - Case structure of electronic control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a case structure that can standardize a case irrespective of the size of a printed board to be inserted. SOLUTION: This case structure 1 comprises a case 10, a printed board 20 and a cover 30. A pair of guide rails 11 are provided on the inside surfaces of the case 10. Each of the guide rails 11 comprises two guide members in parallel extended horizontally from a first guide part 111 that is U-shaped in cross section. The portion between the two guide members on the end surface of the first guide part 111 constitutes an engaging part 111a. On the other hand, steps are provided on the side ends of the main body 21 of the printed board 20 at certain positions so that the end surfaces 21c of the steps contact the engaging parts 111a to control the movement in the insertion direction of the printed board 20. Furthermore, engaging protrusions 33 are provided on the cover 30 to control the movement in the removal direction of the printed board 20 inserted into the case 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of an electronic control unit, and more particularly, to a case constituting a housing and a mounting structure of a cover and a printed circuit board inserted in the housing.

[0002]

2. Description of the Related Art An engine control ECU (hereinafter simply referred to as "EC
U)), generally, when the control target becomes large-scale, individual electric circuit elements for realizing the control become large, and the type and number of electric circuit elements also increase.
As a result, a printed circuit board on which the electric circuit element is mounted,
Also, the size of the housing for housing the printed circuit board varies depending on the scale of the control target.

However, since such printed circuit boards and housings are generally mass-produced industrially, it is necessary to standardize their sizes to some extent in order to reduce the manufacturing cost. As a method of performing such standardization, conventionally, a printed circuit board has been standardized to a size capable of realizing a large-scale specification to some extent, and a housing corresponding thereto has been manufactured. When the control target is small and the number of electric circuit elements mounted on the printed circuit board is small, a measure is taken by not mounting a part of the printed circuit board.

[0004] Such a conventional housing structure is developed by assembling a housing and a printed board shown in FIG. 6 and assembling a sectional view of the housing and printed board shown in FIG. −
Explanation will be made based on the E sectional view. As shown in FIG. 6, the housing structure 301 is configured such that various electric circuit elements are mounted on a rectangular substrate body 321 with respect to an envelope-shaped housing 310 in which one side surface is opened. A printed circuit board 320 on which a connector 340 is attached by a screw 350, a rail 311 provided on the inner side surface of the housing 310,
311. As shown in FIG. 7, a projection 313 having a tapered lower surface protrudes from the inner wall surface of the housing 310, and the insertion end of the inserted printed circuit board 320 is formed into a tapered surface of the projection 313. Is temporarily stopped in a mode of sneaking along. And the cover 33
0 is mounted from the rear of the housing 310 to close the opening, thereby assembling. At this time, the protrusions 333 and 333 provided on the side surface of the cover 330 press the front end of the printed circuit board 320 by the taper provided on the lower surface. That is, the printed circuit board 320 includes the protrusions 313 of the housing 310 and the protrusions 333,
33 so as to be fixed. Then, U-shaped claw members 331 and 331 protruding from both side surfaces of the cover 330 are mounted on the protrusions 315 and 315 provided on both side surfaces of the housing 310 and fitted, so that assembly is performed. Complete. Thus, the standardized housing corresponds to the standardized printed circuit board.

[0005]

SUMMARY OF THE INVENTION However, ECU
Depending on the destination, control function, etc., the required size of the printed circuit board is also various, especially when a large-sized standardized printed circuit board is applied, and there are many unmounted parts on the printed circuit board. However, there is a problem in that the board material and the like in the unmounted part which is not required originally becomes extra bulky, which causes a disadvantage in terms of material cost. Also,
In the above-described conventional configuration, since the size of the printed circuit board and the size of the case correspond to each other, if the printed circuit board is standardized into a plurality of kinds, a plurality of kinds of cases corresponding to the printed circuit board are required. Become. For this reason, there has been a problem that enormous cost and time have to be spent for redesign, manufacture, or management of each housing.

[0006] In view of the above problems, an object of the present invention is to provide a mounting structure between a printed circuit board and a housing that enables standardization of the housing regardless of the size of the inserted printed circuit board.

[0007]

Means for Solving the Problems and Effects of the Invention In order to solve the above-mentioned problems, the electronic control device according to the first aspect of the present invention has a housing structure on which various electric circuit elements are mounted. A printed board in which a connector having a plurality of pins to be electrically connected is fixed at one end, and an opening for inserting the printed board are provided in a hollow main body to guide the insertion of the printed board. Therefore, a case provided with at least a pair of guide rails extending in parallel with the depth direction from the vicinity of the opening of the main body, and a printed circuit board inserted in the case, mounted on the opening, and attached to the case. And a cover fixed.

The housing structure of the present application is characterized in that the case can be standardized regardless of the size of the printed circuit board to be inserted. That is, at predetermined positions in the longitudinal direction of the guide rails, locking portions for locking the movement of the printed circuit board in the insertion direction are respectively provided, and at predetermined positions on both side edges of the printed circuit board. Is provided with a locked portion locked by the locking portion. The printed circuit board is gradually inserted along the guide rail when inserted into the case. When the locked portion of the printed circuit board comes into contact with the locking portion of the guide rail, the locking portion serves as a stopper to lock the insertion of the printed circuit board.
In addition, a locking projection is provided at a predetermined position on a surface of the cover facing the opening, and the locking projection abuts on the non-insertion side end surface of the printed circuit board or the non-insertion side surface of the connector. Thus, the movement of the printed board in the anti-insertion direction can be locked. That is, the printed circuit board is fixed to the case by being sandwiched between the locking portion provided on the guide rail and the locking projection provided on the cover.

In the above structure, the locking of the printed circuit board is not performed at the insertion end position of the printed circuit board as in the prior art, and the locked portion provided at a predetermined position on the side edge of the printed circuit board is not provided. Done in position. Therefore, the size of the region on the insertion side of the locked portion of the printed circuit board can be freely set within a range that can be inserted into the case.

In other words, the printed circuit board has a variable area whose area is variable in the insertion direction with the locked portion as a boundary, and an area which is invariable in the opposite insertion direction. It can be considered to be divided into invariable regions. The variable region and the invariable region are set in advance in consideration of the sizes of a plurality of types of printed circuit boards to be inserted into a case, and the size range of the plurality of types of printed circuit boards is defined by the variable region. Limited to the range that can be changed. The invariable area may be set so as to secure at least an assumed minimum area of the mounting board. In this case, the invariable region is fixed to the case so as to be sandwiched between the locking portion provided on the guide rail and the locking projection provided on the cover.

According to the above configuration, the printed circuit board does not need to be provided with the area of the part which had to be unmounted in the past, and the size can be minimized according to the size and number of the mounted parts. It can be set. For this reason, particularly in the case where each of a plurality of types of printed circuit boards is mass-produced, the effect of reducing material costs can be obtained. On the other hand, as for the case, unlike the conventional case, it is not necessary to individually manufacture a size corresponding to each of a plurality of types of printed circuit boards, and the size can be standardized to some extent, so that the manufacturing cost can be kept low. it can.

The specific configuration of the locking portion and the locked portion is as follows.
One example is described in claim 3 of the present application. That is,
The guide rail includes a first guide portion having a U-shaped cross section provided to extend to the depth side of the case, and two guide rails extending vertically from the end face of the first guide portion to the opening side. And a second guide portion formed of a guide member. The locking portion includes a portion of the end face of the first guide portion sandwiched between the two guide members. on the other hand,
The printed circuit board has a step portion whose width decreases in a direction of insertion from a predetermined position of the substrate body, and the locked portion is formed by an edge surface of the step portion.

That is, when the printed circuit board is inserted, first, the side edge of the variable region having a small width is guided by the groove formed by the U-shaped cross section of the first guide portion. Subsequently, the side edge of the large invariable region forms the second guide portion 2
The guide is guided by a groove formed by the guide member. And
The insertion is completed by the step edge surface located at the boundary between the variable region and the constant region on the printed circuit board being brought into contact with and locked by the locking portion formed by a part of the end surface of the first guide portion. .

According to the above configuration, the invariable area of the printed circuit board is fixed at the predetermined position only by processing a simple shape called a step at a predetermined position of each printed circuit board. Or,
As another example of the specific configuration of the locking portion and the locked portion,
The one described in claim 4 may be adopted. That is, the guide rail is formed of two vertically parallel guide members extending in the depth direction from the vicinity of the opening of the case, and the locking portion includes an end face of the guide rail on the opening side, The locked portion may include a stay provided on the upper surface of both side edges of the printed circuit board.

In the above construction, the stay comes into contact with the end face of the guide rail to transmit the locking force to the printed circuit board. For example, the stay is formed by bending a small metal plate into a predetermined shape. The component may be used, or a portion of a mounted component having a predetermined strength may be used.

According to the above configuration, it is not necessary to form the printed circuit board from a simple quadrangular shape, but only to mount a stay as a locked portion at a predetermined position. For this reason, the effect that the manufacturing process is simplified can be obtained. Also, if a mounting component having sufficient strength can be used as the stay, the mounting process of the stay on the printed circuit board is performed simultaneously with the mounting process of the mounting component, so that the manufacturing process can be further simplified. .

According to a fifth aspect of the present invention, the opening of the case is formed by opening one side surface of a rectangular parallelepiped case main body, and the guide rail is formed from the opening through the opening. It may be formed integrally with the case by die cutting. That is, as the above case,
For example, when manufacturing resin products by injection molding,
By injecting the molten resin material into a casting mold consisting of an outer mold and an inner mold and curing it,
A method of integrally molding the guide rail and the like with the case is adopted. In the above configuration, one surface of the case is opened in order to pull out an inner mold for shaping the shape inside the case.
In this case, this open surface is used as an opening for inserting a printed circuit board. The above configuration is suitable when mass-producing the case by molding or the like.

Further, the connector is fixed to the upper surface of the non-insertion side end of the printed circuit board via a base provided on the lower surface of the connector, and the locking projection of the cover is provided. Alternatively, the printed circuit board may be brought into contact with the side opposite to the insertion side of the base to lock the movement of the printed board in the direction opposite to the insertion direction.

In the above configuration, the locking projection of the cover according to the first aspect is not the end face of the printed circuit board on the side opposite to the insertion side.
It is a specific example for realizing the structure which contacts the anti-insertion side surface of a connector. In this manner, by setting the contact surface of the locking projection on the side surface of the base below the connector, the area of the contact surface can be made larger than when it is set on the end surface of the printed circuit board. This increases the pressure receiving area when holding the printed circuit board, and leads to avoiding the concentration of stress acting on the locking projection.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. It is needless to say that the embodiments of the present invention are not limited to the following examples and can take various forms as long as they belong to the technical scope of the present invention. [First Embodiment] FIG. 1 is an exploded view showing a housing structure according to a first embodiment of the present invention, and FIG.
It is the assembly sectional view seen from A direction.

As shown in FIG. 1, the housing structure 1 is composed of an envelope-shaped case 10 having one side open in a rectangular parallelepiped box shape, a printed board 20 inserted through the opening 12, and a printed circuit board 20. Cover 3 for closing opening 12 after insertion
0. Hereinafter, as shown in FIG. 1, the depth direction of the case 10 (the insertion direction of the printed circuit board 20) is X
The direction, the width direction of the case 10 will be described as a Y direction, and the height direction of the case 10 will be described as a Z direction.

A guide rail 1 serving as a guide when the printed circuit board 20 is inserted is provided below the left and right inner surfaces of the case 10.
Engagement projections 15, 15 for fixing a cover 30, which will be described later, are provided near the opening 12 on the left and right outer surfaces.

The guide rail 11 is provided on the first guide portion 1.
11 and a second guide portion 112. FIG.
The guide rail 11 constitutes the second guide portion 112 as shown in FIG. 1 (a) as viewed in the direction of the arrow BB in FIG. 1 and FIG. 3 (b) as viewed in the direction of the arrow CC in FIG. The two guide members 112a and 112b are configured to extend vertically in parallel from the first guide portion 111 having a U-shaped cross section.
A portion of the end surface of the first guide portion 111 sandwiched between the two guide members 112a and 112b is a locking portion 111 for locking the movement of the printed circuit board 20 in the insertion direction.
a. The first guide portion 111 guides a side edge portion of a variable region 21a of the printed circuit board 20, which will be described later, and the second guide portion 112 includes a constant region 21b.
Is to guide the side edge portion.

The engaging projections 15, 15 are plate-like small pieces which can be engaged with claw portions 31, 31 of a cover 30, which will be described later, and are tapered surfaces 15a, 1 inclined in the X direction, respectively.
5a. On the other hand, the printed circuit board 20 is configured by arranging various mounted components (not shown) and a connector 40 on a rectangular substrate body 21.

A step is provided at a predetermined position in the X direction of the substrate body 21, and the width in the Y direction is reduced toward the depth in the X direction with the step as a boundary. Then, the substrate body 21
Forms a variable region 21a having a variable area according to the size of the mounted component to be disposed on the depth side in the X direction with the step portion as a boundary, and the variable region 21a on the near side in the X direction depending on the size of the mounted component. Immutable region 21 with constant area
b is formed. The connector 40 has plate-shaped bases 41, 41 protruding from the lower surface of the rectangular parallelepiped, and is attached to the front end of the invariable region 21b via the base 41. In this mounting, as shown in FIG. 2, the screw 50 is inserted from the back side of the substrate main body 21,
This is performed by screwing into screw holes (not shown) provided in the bases 41, 41.

The cover 30 is connected to the opening 1 of the case 10.
2, a plate-shaped cover main body 32 having a rectangular outer shape, U-shaped claws 31, 31 extending in the X direction from both left and right ends of the cover main body 32, and a lower right and left side of the cover main body 32. And two locking projections 33, 33 protruding in the X direction.

At the center of the cover body 32, a rectangular through hole 35 is provided. As shown in FIG. 2, one end of the connector 40 can be exposed to the outside through the through hole 35 at the time of assembly. ing. Also, the claws 31, 31 are
Through holes 31a, 31a are formed with the cover body 32,
The cover 30 is fixed to the case 10 by fitting the engagement protrusions 15 into the through holes 31a. Further, as shown in FIG. 2, the tips of the locking projections 33, 33 come into contact with the base wall surface of the connector 40 so that the inserted printed circuit board 20 moves toward the front in the X direction (the direction opposite to the insertion direction). It is configured so that movement can be locked.

Hereinafter, a procedure for mounting the housing structure 1 of the present embodiment will be described. First, the printed circuit board 20 (with circuit elements already mounted) on which the connector 40 is mounted is inserted along the guide rail 11 in the case 1 from its tip. The printed circuit board 20 to be inserted is first inserted while the left and right side edges of the variable region 21a are guided by grooves formed in the first guide portion 111 of the guide rail 11, and then the left and right side edges of the invariable region 21b The part is guided and inserted into the groove formed by the second guide part 112. Then, the locked portion, that is, the edge surface 21c of the step portion of the board main body 21 abuts on the locking portion 111a (see FIG. 3A) of the first guide portion 111, and the X direction ( The movement in the insertion direction) is locked, and the step of inserting the printed circuit board 20 is completed.

In this state, the cover body 32 of the cover 30 is
Is inserted and fitted into the opening 12 of the case 10. The locking projections 33 of the cover 30 are
It contacts the side surfaces of the bases 41, 41 on the lower surface. When the cover 30 is fixed to the case 10, the U-shaped claws 31, 31 provided on both sides of the cover 30 are tapered with respect to the engagement protrusions 15, 15 provided on both side surfaces of the case 10. The process is completed by riding on the surfaces 15a, 15a and engaging the engaging projections 15, 15 with the through holes 31a, 31a.

In the above configuration, the printed circuit board 20 is
Locking projections 33 of cover 30 and first guide portion 111
Are fixed in such a manner as to be sandwiched between the locking portions 111a, 111a. According to the above configuration, the fixing of the printed circuit board in the case is not performed by the restriction of the end surface of the printed circuit board as in the related art, but by the restriction of the step provided at a predetermined position on the printed circuit board. It is possible to freely set the size of the variable area provided on the depth side. For this reason, it is not necessary to separately manufacture a casing corresponding to the size of the printed circuit board, and the casing can be standardized. Further, when the number of components mounted on the printed circuit board is small, the variable region can be set small, so that the material used for the board is not wasted. As a result, particularly in the case of mass production of printed circuit boards, it is possible to effectively reduce material costs and the like. Furthermore, since the front end and the rear end of the printed circuit board are not pressed with a tapered surface as in the related art, no stress is applied to circuit elements and the like on the printed circuit board. Depending on the control target, the outer shape of the connector 40 may change. However, even in this case, it is possible to cope with the situation by standardizing the shapes of the bases 41, 41.

In this embodiment, when the printed circuit board 20 is fixed, the locking projections 33, 3
Although the embodiment in which the base member 3 is brought into contact with the side surfaces of the bases 41, 41 on the lower surface of the connector 40 is employed, the embodiment in which the locking projections 33, 33 abut on the front edge of the printed circuit board 20 may be adopted. In the present embodiment, the guide rails 11, 11
Are provided below the side surface of the case 10, but may be provided at the center or above the case depending on the size of the case in the Z direction, the mounting position of the connector, and the like. Further, needless to say, a mode in which a plurality of pairs of guide rails are provided so that a plurality of printed circuit boards can be stored. [Second Embodiment] FIG. 4 is an exploded perspective view showing a housing structure according to a second embodiment of the present invention, and FIG.
It is the assembly sectional view seen from the D direction.

Since the second embodiment is the same as the first embodiment except that the manner of restraining the printed circuit board is different, the same reference numerals are given to the same components, and the description thereof will be omitted. . Guide rails 211 and 211 serving as guides when the printed board 220 is inserted are provided below the left and right inner surfaces of the case 210 of the housing structure 201 of this embodiment so as to extend in the X direction. Each of the guide rails 21
Reference numeral 1 denotes a configuration in which two guide members 212 and 213 extend vertically in parallel.

At predetermined positions in the X direction on the left and right upper end surfaces of the substrate body 221 (positions corresponding to the steps of the printed circuit board 20 in the first embodiment), stays 223 formed by bending a small metal plate are formed. 223 are attached. The stay 223 has a cross section in which two L-shaped ends are coupled to each other in opposite directions, the lower surface thereof is placed on the upper surface of the substrate body 221, and the screw 225 is screwed from the lower surface. Thereby, it is fastened and fixed to the substrate body 221.
The printed circuit board 220 forms a variable region 221a having a variable area according to the size of the mounted component to be disposed on the depth side in the X direction with the stay 223 as a boundary. An invariable region 221b having an invariable region area depending on the scale is formed.

In the procedure for mounting the housing structure 201 of this embodiment, first, the printed circuit board 2 on which the connector 40 is mounted is mounted.
20 (the circuit element is already mounted)
It is inserted while being guided by the groove formed by the guide rail 211 in 10. A locking surface 223a as a locked portion formed by a vertical portion of the stay 223 provided on the substrate main body 221 forms a locking portion forming an end of the upper guide member 212 constituting the guide rail 211. 212a (see FIG. 5), the movement of the printed board 220 in the X direction (insertion direction) is locked, and the step of inserting the printed board 220 is completed.

In this state, the cover body 32 of the cover 30 is
Is inserted and fitted into the opening 12 of the case 210. Then, the locking projections 33 of the cover 30 abut against the side surfaces of the bases 41 on the lower surface of the connector. The cover 30 is fixed to the case 210 by fixing the U-shaped claw portions 31 provided on both sides of the cover 30 to the engagement protrusions 15 provided on both side surfaces of the case 210. The process is completed by riding on the surfaces 15a, 15a and engaging the engaging projections 15, 15 with the through holes 31a, 31a.

In the above configuration, the printed circuit board 220
The locking projections 33 of the cover 30 and the guide member 21
2 and 212 are fixed so as to be sandwiched by the locking portions 212a. The stay 223 is attached to the board body 221 at the same time as the connector 40 is attached to the board body 221. That is,
Connect the connector 40 with the screw 50 and the stay 223 with the screw 2
25, the flow soldering by the jet solder is performed in a state of being fastened to the substrate body 221 respectively.
As a result, the screws 50 and 225 are firmly fixed to the substrate body 221 and do not fall off.

According to the above configuration, the fixing of the printed circuit board in the case is not performed by the restriction of the end surface of the printed circuit board as in the prior art, but by the restriction of the stay 223 provided at a predetermined position on the printed circuit board surface. To take, stay 22
It is possible to freely set the size of the variable region 221a provided on the depth side from 3. For this reason, it is not necessary to separately manufacture a casing corresponding to the size of the printed circuit board, and the casing can be standardized. Further, when the number of components mounted on the printed circuit board is small, the variable region 221a can be set small, so that the material used for the board is not wasted. As a result, especially in the case of mass production of printed circuit boards, material cost can be effectively reduced. Furthermore, since the front end and the rear end of the printed circuit board are not pressed with a tapered surface as in the related art, no stress is applied to circuit elements and the like on the printed circuit board.
Depending on the control target, the outer shape of the connector 40 may change.
This can be dealt with by standardizing the shapes of 1, 41.

In this embodiment, the stay 223 is used.
Although a metal plate formed by bending a small metal plate is used as an example, a form in which one of the circuit structure elements is used as a locking member may be used. In fixing the printed circuit board 220, the locking projections 33, 33 of the cover 30 are brought into contact with the side surfaces of the bases 41, 41 on the lower surface of the connector 40. A mode may be adopted in which the abutment 20 is brought into contact with the front side edge.
Further, in the present embodiment, the guide rails 211 and 211 are provided as a pair below the side surface of the case 210. However, depending on the size of the case in the Z direction and the mounting position of the connector, the guide rails 211 and 211 are provided at the center or above the case. Is also good. Further, needless to say, a plurality of pairs of guide rails may be provided so that a plurality of printed circuit boards can be stored.

[Brief description of the drawings]

FIG. 1 is an exploded assembly view showing a housing structure according to a first embodiment of the present invention.

FIG. 2 is an assembled sectional view of the housing structure according to the first embodiment of the present invention.

FIG. 3 is a partial sectional view of a guide rail of the housing according to the first embodiment of the present invention.

FIG. 4 is an exploded assembly view showing a housing structure according to a second embodiment of the present invention.

FIG. 5 is an assembled sectional view of a housing structure according to a second embodiment of the present invention.

FIG. 6 is an assembled development view showing a conventional housing structure.

FIG. 7 is an assembled sectional view of a conventional housing structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing structure, 10 ... Case, 11 ... Guide rail, 20 ... Printed circuit board, 21 ... Board main body, 21a ... Variable area, 21b ... Invariable area, 21c ... locking surface, 30 ... cover, 3
2 ... cover body, 33 ... locking projection, 40 ...
· Connector, 41 ··· Base, 111 ··· First guide portion, 111a ··· Locking portion, 112 ··· Second guide portion, 112a and 112b ··· Guide member, 20
1 ... housing structure, 210 ... case, 211 ...
・ Guide rail, 212 ・ ・ ・ Guide member, 213 ・
..Guide members, 212a...
・ Printed circuit board, 221 ... board body, 221a
..Variable area, 221b... Invariable area, 223
・ Stay, 223a ・ ・ ・ Locking surface

Claims (6)

[Claims] A printed circuit board on which various electric circuit elements are mounted and a connector having a plurality of pins electrically connected to the electric circuit elements is fixed to one end; An opening for inserting a printed circuit board is provided, and a case provided with at least one pair of guide rails extending parallel to the depth direction from near the opening of the main body to guide the insertion of the printed circuit board, A cover attached to the opening while the printed circuit board is inserted in the case, and a cover fixed to the case; and At predetermined positions in the longitudinal direction, locking portions for locking the movement of the printed circuit board in the insertion direction are respectively provided, and predetermined positions of both side edges of the printed circuit board are provided. The locked portion is provided with a locked portion to be engaged with the locking portion, and a predetermined position of a surface of the cover facing the opening is opposite to the opposite side of the printed circuit board. A locking projection is provided to abut on the insertion-side end surface or the anti-insertion side surface of the connector and lock the movement of the printed circuit board in the anti-insertion direction. The printed circuit board is provided with the cover attached to the opening. Thereby, a locking projection provided on the cover,
A housing structure for an electronic control device, wherein the housing is fixed to the case so as to be sandwiched by a locking portion provided on the guide rail. 2. The printed circuit board is divided into a variable region having a variable area in an insertion direction and a constant region having a constant area in a direction opposite to the insertion direction. An invariable area, a locking projection provided on the cover,
The housing structure of the electronic control device according to claim 1, wherein the housing is fixed to the case so as to be held by a locking portion provided on the guide rail. 3. The guide rail has a first guide portion having a U-shaped cross section and extending to a depth side of the case.
A second guide portion comprising two guide members extending vertically in parallel from the end surface of the first guide portion on the side of the opening, and the locking portion is provided on the end surface of the first guide portion. The printed circuit board has a step portion that is narrowed in a direction of insertion from a predetermined position of the substrate body, and the locked portion is the step portion. The housing structure of the electronic control device according to claim 1, wherein the housing has an edge surface. 4. The guide rail is composed of two vertically parallel guide members extending in the depth direction from the vicinity of the opening of the case, and the locking portion is an end face of the guide rail on the opening side. 3. The housing structure of the electronic control device according to claim 1, wherein the locked portion comprises a stay provided on an upper surface of both side edges of the printed circuit board. 4. 5. The case body has a rectangular parallelepiped shape, the opening is formed by opening one side surface of the case, and the guide rail is formed by cutting the case from the opening. The housing structure of the electronic control device according to any one of claims 1 to 4, wherein the housing structure is formed integrally with the electronic control device. 6. The connector is fixed to an upper surface of a non-insertion side end of the printed circuit board via a base provided on a lower surface of the connector, and a locking projection of the cover contacts a non-insertion side surface of the base. The housing structure of the electronic control device according to any one of claims 1 to 5, wherein the electronic control device is in contact with and can stop the movement of the printed board in the direction opposite to the insertion direction.