JP2011165734A - Electronic control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic control device that can securely fix a printed board in a case without depending on the variations of the thickness of the printed board. <P>SOLUTION: Fitting sections 19A and 19C push second sidewalls 13A and 13C of projections 8A and 8C not opposite to projections 8B and 8D toward the side opposite to the second projections 8B and 8D. Fitting sections 19B and 19D push second sidewalls 13B and 13D of the projections 8B and 8D not opposite to projections 8A and 8C toward the side opposite to the projections 8A and 8C. Both ends of a printed board 2 are held by first sidewalls 12A and 12C of the projections 8A and 8C and first sidewalls 12B and 12D of the projections 8B and 8D that are opposite to the first sidewalls 12A and 12C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic control device in which a printed circuit board is fixed inside a housing.

  Conventional electronic control devices are known in which a printed circuit board is fixed in a casing using a claw-like member without using screws in order to reduce manufacturing costs (for example, Patent Document 1 and Patent Document 2). reference).

JP 2003-229682 A JP-A-10-70381

  However, in such a conventional electronic control device, since the thickness of the printed board varies due to molding errors, a gap is formed between the protruding portion of the claw-like member and the upper surface of the printed board, and the printed board is fixed in the housing. There was a problem that it might not be possible.

  The present invention has been made to solve such a conventional problem, and provides an electronic control device capable of securely fixing a printed circuit board inside a housing without depending on variations in the thickness of the printed circuit board. For the purpose.

  In order to achieve the above object, the present invention is such that the first fitting portion presses the side wall of the first protruding portion on the side not facing the second protruding portion to the side facing the second protruding portion, The second fitting portion presses the side wall of the second protruding portion on the side not facing the first protruding portion to the side facing the first protruding portion, and the first and second protruding portions are opposed to each other. The both sides of the printed circuit board are held between the side walls.

  According to the electronic control device of the present invention, there is an effect that the printed circuit board can be reliably fixed inside the housing without depending on the variation in the thickness of the printed circuit board.

1 is an exploded perspective view of an electronic control device according to an embodiment of the present invention. Enlarged view of dotted line portion A in FIG. Sectional drawing when the section along the line DD in FIG. 2 is viewed in the positive direction of the Y axis Enlarged view of dotted line portion B in FIG. Enlarged view when the dotted line portion C in FIG. 1 is viewed in the positive direction of the Z-axis Sectional drawing when the section along the line EE in FIG. 5 is viewed in the positive direction of the Y axis The figure explaining the state before attaching a cover to the housing | casing which is the principal part of the same FIG. The figure explaining the state when attaching a cover to the housing | casing which is the principal part of FIG.

  Hereinafter, an electronic control device of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of an electronic control device according to an embodiment of the present invention. X shown in FIG.
In the YZ axis, the X axis indicates the width direction (long side direction) of the electronic control device, the Y axis indicates the depth direction (short side direction) of the electronic control device, and the Z axis indicates the height direction of the electronic control device. . The XYZ axes are similarly indicated in the following drawings.

  As shown in FIG. 1, the electronic control device includes a housing 1, a printed circuit board 2 disposed inside the housing 1, and a cover 3 that is attached to the housing 1 and covers the printed circuit board 2.

  The housing 1 has an open top surface. In addition, the housing 1 is provided with an opening through which a connector (not shown) is passed through a part of the bottom surface. The housing 1 has a fixing portion 4 and a lock claw 5. The casing 1 has fixing portions 4 for fixing the printed circuit board 2 at the four corners on the short side of the bottom surface. The housing 1 has a lock claw 5 for fixing the cover 3 on the outer side surface of the long side.

  The printed circuit board 2 has a flat plate shape, and electronic circuits (not shown) are mounted on the upper surface and / or the bottom surface. The printed circuit board 2 is placed inside the housing 1 through the opening on the upper surface of the housing 1.

  The cover 3 has a lock portion 6 on the outer long side surface. The cover 3 covers the printed circuit board 2 and seals the opening of the housing 1 by fitting the lock claw 5 into the opening 6 </ b> A provided in the lock unit 6.

  The fixed part 4 is composed of four fixed parts 4A to 4D. The four fixing portions 4 </ b> A to 4 </ b> D are respectively disposed at the four corners on the short side of the bottom surface of the housing 1. The fixed part 4A and the fixed part 4B face each other. Further, the fixed portion 4C and the fixed portion 4D face each other. The fixed portions 4B and 4D are in a line-symmetric relationship with respect to the fixed portions 4A and 4C with the Y axis drawn from the center of the housing 1 as the axis of symmetry.

  Next, the structure of the fixing part 4 will be described in detail. Here, since the fixing parts 4A to 4D have the same structure, the fixing part 4A will be described below, and detailed description of the fixing parts 4B to 4D having the same structure will be omitted unless particularly necessary. Similarly to the description of the fixing portion 4A, detailed description of the portions corresponding to the arrangement positions of the fixing portions 4B to 4D having the same structure as the portion corresponding to the arrangement position of the fixing portion 4A is omitted unless particularly necessary. To do.

  FIG. 2 is an enlarged view of a dotted line portion A in FIG. 3 is a cross-sectional view of the cross section taken along the line DD in FIG. 2 when viewed in the positive direction of the Y axis.

  As shown in FIG. 2, the fixing portion 4A includes a base portion 7A, a protruding portion 8A, a rib portion 9A, a reinforcing portion 10A, and a support portion 11A.

  The base portion 7 </ b> A protrudes along the short side wall of the housing 1 from the bottom corner of the housing 1. Therefore, the side wall of the base portion 7 </ b> A is provided substantially parallel to the short side wall of the housing 1.

  The protrusion 8A is made of a material that can be elastically deformed by an external force, such as a resin. It protrudes from the upper end of the base part 7A. Similar to the base portion 7 </ b> A, the protruding portion 8 </ b> A protrudes substantially parallel along the short side wall of the housing 1. As shown in FIG. 3, the protruding portion 8 includes a first side wall 12A on the side facing the fixed portion 4B (X-axis positive direction side) and a side not facing the fixed portion 4C (X-axis negative direction side). The second side wall 13A and the tip 14A. The outer periphery of the distal end portion 14A is rounded toward the fixed portion 4B facing the tip portion 14A.

  The rib portion 9A protrudes from the bottom surface of the housing 1. The side walls of the rib portion 9A are coupled to both ends of the base portion 7A and part of both ends of the protruding portion 8A. The printed circuit board 2 is placed on the upper surface of the rib portion 9A.

  The reinforcing portion 10 </ b> A protrudes from the bottom surface of the housing 1. The reinforcing portion 10A extends in the long side direction (X-axis direction) of the housing 1 along both side walls of the base portion 7A. Thereby, since both side walls of the base portion 7A are reinforced by the reinforcing portions 10A, deformation of the base portion 7A in the long side direction (X-axis direction) when the external force is applied is restricted. The base portion 7A and the protruding portion 8A may be formed as one protruding portion.

  11 A of support parts are provided in the side (X-axis positive direction) facing the fixing | fixed part 4B rather than the base part 7A, the protrusion part 8A, the rib part 9A, and the reinforcement part 10A, and protrude from the bottom face of the housing | casing 1. FIG. 11 A of support parts are spreading in the XY plane direction as it goes to the bottom face side of the housing 1.

  Next, a portion of the printed board 2 corresponding to the arrangement position of the fixing portion 4A will be described.

  FIG. 4 is an enlarged view of a dotted line portion B in FIG. As shown in FIG. 4, the printed circuit board 2 includes a hole 15 </ b> A through which the support portion 11 </ b> A is inserted and a hollow portion 16 </ b> A through which the protrusion 8 </ b> A is inserted. The holes 15 </ b> A are provided in the corners of the printed circuit board 2. The recess 13 is provided at the end on the short side of the printed circuit board 2.

  Next, a portion of the cover 3 corresponding to the arrangement position of the fixing portion 4A will be described.

  FIG. 5 is an enlarged view when the dotted line portion C of FIG. 1 is viewed in the positive direction of the Z-axis. 6 is a cross-sectional view of the cross section taken along line EE in FIG. 5 when viewed in the positive direction of the Y axis.

  As shown in FIG. 5, the cover 3 has a receiving portion 17A that receives the fixing portion 4A at a portion corresponding to the arrangement position of the fixing portion 4A.

  As shown in FIGS. 5 and 6, the receiving portion 17A requires an opening 18A into which the protruding portion 8A of the fixed portion 4A is inserted, a fitting portion 19A for fitting the protruding portion 8A, and the protruding portion 8. As described above, the stopper 20A that restricts the movement to the side (X-axis positive direction side) facing the fixed portion 4B is provided.

  As shown in FIG. 6, the inner wall of the fitting portion 19 </ b> A presses the protruding portion 8 to the receiving portion 17 </ b> A and guides the protruding portion 8 to the side facing the fixed portion 4 </ b> B (X-axis positive direction side). And a pressing portion 22A.

  21 A of guide parts are arrange | positioned rather than the 2nd side wall 13A of 8 A of protrusion parts on the side (X-axis negative direction) which does not oppose the fixing | fixed part 4B. Further, the lower end of the guide portion 21A is inclined to the side (X-axis positive direction) facing the fixed portion 4B as it goes upward (Z-axis positive direction). This facilitates insertion of the protruding portion 8A into the receiving portion 17A.

  22 A of press parts incline to the side (X-axis positive direction) which opposes the fixing | fixed part 4B as it goes upwards (Z-axis positive direction). And the position of this press part 22A is arrange | positioned in the side (X-axis positive direction) which opposes the fixing | fixed part 4B rather than the 2nd side wall 13A of 8 A of protrusion parts. Thereby, 19 A of fitting parts can press the protrusion part 8A to the side (X-axis positive direction) facing the fixing | fixed part 4B.

  Next, assembly of the cover 3 to the housing 1 on which the printed circuit board 2 is placed will be described.

  FIG. 7 is a diagram illustrating a state before the cover 3 is attached to the housing 1. FIG. 8 is a diagram for explaining a state when the cover 3 is attached to the housing 1.

As shown in FIG. 7 and FIG. 8, the printed circuit board 2 includes the fixed portion 4B on the upper surface of the rib portion 9A.
Is placed on the opposite side (X-axis positive direction). Further, the support portion 11 </ b> A is inserted through the hole 15 </ b> A of the printed board 2. Since the support portion 11A has a diameter that extends downward (in the negative direction of the Z-axis) (expands in the XY plane), the support portion 2A can be supported at a predetermined height. Further, the recessed portion 16A of the printed circuit board 2 is in contact with the first side wall 12A of the protruding portion 8A. Thereby, the printed circuit board 2 can be positioned by the support part 11A and the hollow part 16A.

  As shown in FIGS. 7 and 8, when the cover 3 is to be assembled to the housing 1, the guide portion 21 </ b> A is positioned on the side (X-axis negative direction) that does not face the fixed portion 4 </ b> B with respect to the protruding portion 8 </ b> A. Since the portion 14A is rounded, the distal end portion 14A is guided by the guide portion 21A and inserted in the upward direction (Z-axis positive direction) of the fitting portion 19A. The protruding portion 8A is inserted from the guide portion 21A into the pressing portion 22A.

  Next, since the pressing portion 22A is positioned on the side (X-axis positive direction) facing the fixed portion 4B with respect to the protruding portion 8A, the second side wall 13A of the protruding portion 8A is on the side facing the fixed portion 4B (X-axis). Press in the positive direction). In particular, since the pressing portion 22A is inclined in the upward direction (Z-axis positive direction) toward the side facing the fixed portion 4B (X-axis positive direction), the protruding portion 8A is smoothly inserted into the fitting portion 19A. be able to.

  Since the pressing portion 22A presses the second side wall 13A of the protruding portion 8A toward the side facing the fixed portion 4B (X-axis positive direction), the protruding portion 8A faces the fixed portion 4B as shown in FIG. Folded to the side. Then, the first side wall 12A of the protruding portion 8A presses the upper end P of the recessed portion 13A of the printed board 2. The protruding portion 8A is bent with a portion of the first side wall 12A in contact with the upper end P as a fulcrum. By this bending, the first side wall 12A presses the upper end P of the recessed portion 13A to the side facing the fixed portion 4B (X-axis positive direction). From the above, the first short side of the printed circuit board 2 is pressed to the side facing the fixed portion 4B (X-axis positive direction) by the protruding portion 8A pressed by the pressing portion 22A.

  Similarly, in the fixing portion 4B that is in a line-symmetrical relationship with the fixing portion 4A with the Y axis drawn from the center of the housing 1 as the axis of symmetry, the second side wall 13B of the protruding portion 8B is fixed to the pressing portion 22B. It is pressed to the side facing the portion 4A (X-axis negative direction). And as for the protrusion part 8B, the 1st side wall 12B presses the upper end Q of the hollow part 13B of the printed circuit board 2. FIG. The protruding portion 8B is bent with a portion of the first side wall 12B in contact with the upper end Q as a fulcrum. By this bending, the first side wall 12B presses the upper end Q of the recessed portion 13B to the side facing the fixed portion 4A (X-axis negative direction). From the above, the second short side of the printed circuit board 2 is pressed to the side facing the fixed portion 4A (X-axis negative direction) by the protruding portion 8B pressed by the pressing portion 22B.

  As described above, according to the electronic control device of the embodiment of the present invention, the printed circuit board 2 has the first short side pressed by the protruding portions 8A and 8C, and the second short side that is the opposite side of the first short side. Is pressed by the protrusions 8B and 8D. That is, the printed circuit board 2 is sandwiched between the first side walls 12A and 12C and the first side walls 12B and 12D. Therefore, even if the thickness of the printed circuit board 2 varies, the printed circuit board 2 can be reliably fixed inside the housing 1 by the first side walls 12A and 12C and the first side walls 12B and 12D.

  In this embodiment, as shown in FIG. 1, the fixed portions 4A to 4D and the corresponding receiving portions 17A to 17D are provided at the four corners of the electronic control device. What is necessary is just to provide the fixing | fixed part 4 and the receiving part 17 in the edge part of two sides.

  The present invention is useful as an electronic control device having a printed circuit board inside a case used for a smart keyless entry system, engine control, and the like.

DESCRIPTION OF SYMBOLS 1 Case 2 Printed circuit board 3 Cover 4 Fixing part 8 Protrusion part 9 Rib part 12 1st side wall 13 2nd side wall 17 Receiving part 22 Press part

Claims (1)

A housing having an opening;
A printed circuit board disposed in the housing;
A cover covering the opening of the housing;
A first protrusion protruding from an end of one side of the bottom surface of the housing;
A second protrusion that protrudes from the opposite end of the bottom surface of the housing and faces the first protrusion;
A first mounting portion that protrudes from the housing along both ends of the first protruding portion and mounts one end of the printed circuit board on an upper surface;
A second mounting portion that protrudes from the housing along both ends of the second protruding portion and mounts the other end of the printed circuit board on the upper surface;
A first fitting portion for fitting the first protrusion on the back surface of the cover;
A second fitting portion for fitting the second protrusion on the back surface of the cover;
The first fitting portion presses the side wall of the first protruding portion on the side not facing the second protruding portion to the side facing the second protruding portion,
The second fitting portion presses the side wall of the second protruding portion on the side not facing the first protruding portion to the side facing the first protruding portion,
The electronic control device according to claim 1, wherein the first and second protrusions sandwich both ends of the printed circuit board with opposing side walls.