JP2002368452A - Electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high reliability electronic controller which prevents a board from being subjected to a bending force cause by thermal deformation of a case member, if any, thereby avoiding cracking solder on the board. SOLUTION: Board hold members 24, 25, 26 have slits 24e, 25e, 26e formed approximately at right angles to the board 11. The lengthwise axes of the slits 24e, 25e, 26e on a virtual plane extending in parallel to the board 11 so as to cut the slits 24e, 25e, 26e make specified angles to one side 22a of the main body 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic control unit, and more particularly, to an electronic control unit for driving and controlling a pressure control unit such as an ABS (antilock brake system).

[0002]

2. Description of the Related Art FIGS. 6 to 9 show such a pressure control device. FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 8 is a cross-sectional view illustrating thermal deformation described later. FIG. 9 is a detailed cross-sectional view of a substrate holding unit described later.

This device has electronic components (not shown) on its surface.
And a substrate 111 having mounting holes 114, 115, 116 and 117, a substantially rectangular main body 122, and one side 122 a of the main body that overhangs the main body 122 at one side and is integrally formed and substantially formed. A case member 121 having a rectangular connector portion 123;
Board holding portions 124 and 125 formed on the case member 121 and fitted in the mounting holes to fix the board 111;
The electronic control device 105 includes 126 and 127.

[0004] Substrate holders 124, 125, 126 and 1
27 are cylindrical parts 124b, 125b, 126b, respectively.
, 127c and frusto-conical tips 124c, 125c, 126c having a bottom portion larger than the diameter of the cylindrical portion by a predetermined dimension.
And projections 124a, 125a, and 12 composed of
6a and 127a, and support portions 124d, 125d, 126d and 127d for supporting the weight of the substrate 111. Also, the projections 124a, 125a, 126a and 12
7a is provided with slits 124e, 125e, 126e and 127e formed at right angles to the substrate 111, respectively, so that the mounting holes 112, 113, 114 and 11 are provided.
5 when it is fitted into the housing. Therefore, a so-called snap fit in which the substrate 111 is easily mounted with one touch and the substrate 111 is securely fixed without using other fixing means is realized, and the number of steps for assembling the substrate 111 to the case member 121 is reduced. Is done.

[0005]

A conventional device of this kind is:
Since the case member is mounted in the engine room of the vehicle, deformation of the case member (shown in FIG. 8) due to heat generated by the engine occurs,
Particularly, the warpage of the connector portion that is overhanging from the main body portion is large. Further, since the substantially rectangular connector portion and the substantially rectangular body portion which are smaller than the main body portion are integrally formed, they are not uniformly deformed, and are not deformed uniformly, but are warped inflection lines (line D in FIG. 6; base point of warpage). ) Has an angle θ with respect to one side (line 122a in FIG. 6) of the square in which the main body and the connector are integrated. At this time, the substrate fixed to the case member by the substrate holding portion also deforms following the deformation of the case member.

A projection having a slit is easily deformed in a direction perpendicular to the slit and is hardly deformed in a direction parallel to the slit. However, in the conventional apparatus, the slit is formed by integrating the main body portion and the connector portion. Is formed in parallel with one side of the square (line 122a in FIG. 6)
Since the slit and the warp inflection line are not parallel, the deformation of the projection hardly occurs due to the warpage of the connector portion. For this reason, the substrate is bent in a “C” shape as shown in FIG. 8, and there is a possibility that the solder near the warp inflection line may be broken, resulting in poor conduction or falling off of the electronic component.

The present invention has been made in view of the above circumstances, and does not apply a bending force to a substrate even when thermal deformation occurs in a case member, and the solder on the substrate may be cracked. It is an object of the present invention to provide a highly reliable electronic control device.

[0008]

According to a first aspect of the present invention, there is provided a substrate having electronic components arranged on a surface thereof and having a plurality of mounting holes, and a substantially rectangular shape. A case member having a body portion and a connector portion which is formed integrally with the body portion overhanging on one side of the body portion, and which is formed on the case member; and An electronic control device comprising: a plurality of substrate holding portions that fit and fix the substrate, wherein the substrate holding portion includes a projection having a slit formed substantially at right angles to the substrate, A longitudinal axis of the slit on an imaginary plane which is parallel and cuts the slit has a predetermined angle with respect to one side of the main body. You configure the device.

According to the first aspect of the present invention, since the slit is formed to have a predetermined angle with respect to one side of the main body, the projection can be easily inclined in accordance with the warpage of the connector. . For this reason, since the substrate is not restrained by the projections and bent in a “C” shape, a solder crack does not occur and a highly reliable electronic control device can be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electronic control unit according to the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment according to the present invention.

In FIG. 1, an electronic control unit 5 has a motor 10 mounted on a lower surface and a motor 10 inside.
Are integrally mounted on the upper part of the brake hydraulic unit 11 provided with a hydraulic pump, a pressure control valve, a hydraulic passage, and a plurality of solenoid valves (all not shown) which operate by receiving the driving force. . The electronic control unit 10 and the brake hydraulic unit 11 are usually mounted in an engine room.

A coil 31 is fixed to the upper surface of the brake hydraulic unit 11 by caulking or the like, and a lower resin case 21 (case member) is fixed by screws so as to cover the coil 31. Note that the pressure control valve and the coil 31 constitute an electromagnetic valve.

The lower resin case 21 and the upper resin case 20 are firmly connected by welding or the like.
The insides of the lower resin case 21 and the upper resin case 20 are air-tightly and liquid-tightly shielded from the atmosphere.

FIG. 2 shows an upper resin case 20 and a substrate 11.
FIG. 2 is a plan view of the electronic control device 10 from which is removed. FIG.
In the case, the lower resin case 21 is
2 and a connector portion 23 formed integrally with the main body portion 22 by overhanging on one side 22a of the main body portion 22
Consists of

The lower resin case 21 is provided with substrate holding portions 24, 25 and 26 for holding a substrate, which are integrally provided with the lower resin case 21.

The cross-sectional shapes of the substrate holding portions 24 and 25 are the same as those of the substrate holding portions provided on the case member of the conventional electronic control device shown in FIG.
The protrusions 24a, 25a include frusto-conical tips 24c, 25c having bottoms larger than the diameters of the cylindrical portions 24b, 25b by a predetermined dimension, and support portions 24d, 25d for supporting the weight of the substrate 11. .

The projections 24a and 25a are respectively provided on the substrate 11
Are provided with slits 24e and 25e formed at right angles, so that when they are fitted into the mounting holes 14 and 15, a spring action is generated. Therefore, a so-called snap fit in which the substrate 11 is easily mounted with one touch and the substrate 11 is securely fixed without using other fixing means is realized, and the number of steps of assembling the substrate 11 to the lower resin case 21 is increased. Is reduced.

The lower resin case 21 is provided with a substrate holding portion 26 for holding a substrate integrally with the lower resin case 21.

As shown in FIG. 5, the substrate holder 26 has a different cross-sectional shape from the substrate holders 24 and 25 described above. In other words, the substrate holding unit 26 includes a cylindrical protrusion 26a having a slit 26e formed at a right angle to the substrate 11 and a supporting unit 26d that supports the weight of the substrate 11, and does not have a truncated cone-shaped tip. . Therefore, the substrate holding unit 26
Unlike the board holding parts 24 and 25, the board holding parts 24 and 25 do not have a snap-fit function and are only fitted into the mounting holes 16 with a predetermined expanding force.

The projections 24a, 25a and 26a are
Each of the slits 24e, 25e, and 26e is easily deformed in a direction perpendicular to the longitudinal axis and is hardly deformed in a direction parallel to the slits.

The longitudinal axes of the slits 24e, 25e and 26e formed in the projections 24a, 25a and 26a are not parallel to one side 22a of the substantially rectangular main body 22, but are inclined at a predetermined angle θ. It is provided.

The electronic control unit 10 is mounted in an engine room, and the lower resin case 21 is deformed by heat generated by the engine. In particular, the connector portion 23 overhanging from the main body portion 22 has a large warp, and the substantially rectangular connector portion 23 and the substantially rectangular main body portion 22 which are smaller than the main body portion 22 are warped.
Are not integrally deformed because they are integrally formed. For this reason, the warp inflection line (line B in FIG. 2; a portion serving as a base point of the warp) is positioned with respect to one side of the square (the line 122a in FIG. 2) where the main body 22 and the connector 23 are integrated. Will have an angle θ.

In this embodiment, the angle of the warp inflection line with respect to one side of the square and the slit 24 with respect to one side of the square
The angles of the longitudinal axes of e, 25e and 26e are the same θ. Therefore, even if the connector portion 23 is warped due to thermal deformation to bend the substrate 11, the protrusions 24a having the slits 24e, 25e, and 26e whose longitudinal axes are inclined by the same angle as the warp inflection line. 25
a and 26a can be easily tilted,
Board 1 not snap-fitted in mounting hole 16
1 is slidable in the vertical direction (the vertical direction in FIGS. 3 and 4) with respect to the protrusion 26a. Therefore, the substrate 1
No. 1 can follow the warpage of the connector portion 23 without applying a bending force (FIG. 4).

That is, in this embodiment, even if the connector portion 23 is warped due to thermal deformation, the substrate 11
Does not bend in a “C” shape, and the solder on the substrate does not crack.

In the above embodiment, the substrate holding portion 26 is composed of a cylindrical projection 26a having a slit 26e formed at right angles to the substrate 11, and a supporting portion 26d for supporting the weight of the substrate 11, and has a truncated cone shape. Without the shape of the tip,
Does not have a snap fit function.

However, the present invention is not limited to this mode, and the projection 26a of the substrate holding portion 26 may have a frustoconical tip shown in FIG. That is,
Since the projection 26a having the slit 26e whose longitudinal axis is inclined by the same angle as the warp inflection line can be easily inclined, the substrate 11 can prevent the connector portion 23 from being warped without bending force. It is possible to follow.

[0028]

As described above, according to the present invention, even when the case member is thermally deformed, the bending force is not applied to the substrate, and the reliability on the solder on the substrate does not crack. It is possible to provide a high electronic control device.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which an electronic control unit according to the present invention is mounted on a brake hydraulic unit.

FIG. 2 is a plan view of the electronic control device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a cross-sectional view showing thermal deformation of a connector portion.

5A and 5B are a plan view and a cross-sectional view illustrating a substrate holding unit of the electronic control device according to the embodiment of the present invention.

FIG. 6 is a plan view of a conventional electronic control device.

FIG. 7 is a sectional view taken along the line CC in FIG. 6;

FIG. 8 is a cross-sectional view showing thermal deformation of a connector section of a conventional electronic control device.

FIG. 9 is a plan view and a cross-sectional view showing a substrate holding unit of a conventional electronic control device.

[Explanation of symbols]

5 Electronic Control Device 11 Boards 14, 15, 16 Mounting Holes 21 Lower Resin Case (Case Member) 22 Main Body 22a One Side 23 Connector 24, 25, 26 Board Holder 24a, 25a, 26a Projection 24e, 25e, 26e Slit

Claims (1)

[Claims] An electronic component is disposed on a surface of the substrate, the substrate has a plurality of mounting holes, a substantially rectangular main body, and one side of the main body is overhanged with respect to the main body and integrally formed. An electronic control device comprising: a case member having a substantially rectangular connector portion; and a plurality of substrate holding portions formed on the case member and fitted in the mounting holes to fix the substrate. The substrate holding portion includes a projection having a slit formed substantially at right angles to the substrate, and a longitudinal axis of the slit on a virtual plane that is parallel to the substrate and cuts the slit is An electronic control unit having a predetermined angle with respect to one side of the main body.