JP2010012842A - Electronic control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem with a conventional electronic control device that when the pressure jet caused by the high-pressure washing strikes a breathing filter, a very small space is formed between an O-ring of the breathing filter and a contact surface of a cover, and water possibly enters inside a case. <P>SOLUTION: In order to protect a breathing filter from pressure jet of the high-pressure washing, the breathing filter is supported by two kinds of projections of different heights so as not to be moved even when the pressure jet directly strikes the breathing filter during the high-pressure washing, preventing any very small space from being formed between an O-ring of the breathing filter and a contact surface of a cover, and preventing water ingress inside a case. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic control device and a waterproof case, and more particularly to an electronic control device and a waterproof case in which a printed wiring board is accommodated in a waterproof case and a breathing filter is provided in the waterproof case.

  As an in-vehicle electronic control device mounted in a water-spilling part in an engine room or the like, a printed wiring board is accommodated in a waterproof case, and a breathing filter for breathing the inside and outside of the waterproof case is attached to the waterproof case. What is known.

  In order to prevent the pressure jet from directly hitting the respiratory filter during high-pressure washing of the engine room, the concave portion is formed in the waterproof case, and the respiratory filter is disposed in the concave portion, so that the respiratory filter is disposed in the concave portion. There is one provided with a drainage groove that is surrounded by the inner wall of the recess and further extends from the recess to the side surface of the waterproof case (for example, Patent Document 3).

JP 2005-150376 A JP 2005-129861 A JP 2002-134939 A

  In the conventional electronic control device, when a pressure jet flow by high pressure washing hits the breathing filter, a minute gap is formed on the contact surface between the O-ring and the cover of the breathing filter, and water may enter the case.

  The present invention has been made in view of the above problems, and the purpose of the present invention is to protect the breathing filter from the pressure jet of the high-pressure washing by the conventional structure. Even if the pressure jet directly hits the breathing filter during high-pressure washing, the projections support the breathing filter so that it does not move, prevent the gap between the O-ring and the cover contact surface of the breathing filter, It is to prevent water from entering.

  Protrusions (protrusions (large)) are arranged outside the respiratory filter and provided diagonally or radially. Also, by providing a projection (projection (small)) on the bottom of the breathing filter, even if the pressure jet directly hits the breathing filter during high-pressure washing, the breathing filter does not move due to the projection, and the inside of the case Water can be prevented from entering.

  Since the electronic control device of the present invention does not have an outer wall that protects the breathing filter as in the prior art, a minute gap is generated on the contact surface between the O-ring and the cover of the breathing filter when the pressure jet from the high-pressure washing hits the breathing filter. There is a risk of water intrusion into the case, but the present invention prevents the breathing filter from moving due to protrusions even when the pressure jet directly hits the breathing filter during high-pressure washing, preventing water from entering the case. I can do it. In addition, the structure prevents moisture retention, suppresses corrosion of the breathing filter and O-ring caused by water and foreign matter, and does not restrict the mounting direction, posture and position in the engine room, and expands the degree of freedom of mounting the electronic control unit. There are advantages to doing.

  Furthermore, if there is a waterproof case as a base, it is possible to add the functions and effects of the present invention simply by adding the above-mentioned protrusions, and the applicability is high.

  Hereinafter, the present invention will be specifically described with reference to the best mode for carrying out the electronic control device of the present invention, but the present invention is not limited to the following examples.

  FIG. 1 shows a block diagram of an electronic control device according to the present invention.

  Reference numeral 1 denotes an electronic control device of the present invention. The electronic control device 1 shows a cover that is a part of two waterproof cases. Reference numeral 3 denotes a base which is a part of a waterproof case of the electronic control device. When these are integrated and accompanied by a seal structure, an electronic control device that maintains waterproofness is obtained.

  The cover 2 and the base 3 contain a printed circuit board on which electronic components are mounted. A harness extending from the vehicle and a connector 4 included in the electronic control device are connected to input information about each switch from the vehicle. And control the load accordingly. Reference numeral 5 denotes a breathing filter provided to absorb the pressure difference between the inside and outside of the electronic control unit 1 and to breathe when a pressure difference between the inside and outside of the electronic control unit 1 occurs. The breathing filter 5 has, for example, a silicon O-ring 53 in a mold housing 51 in order to maintain the sealing performance between the Gore-Tex film 52 and the cover 2. The cover 2 which is a part of the waterproof case has a protrusion (large) 11 and a protrusion (small) 12 according to the present invention. The protrusion (large) 11 is provided on the outer peripheral portion of the respiratory filter 5. The protrusion (small) 12 is provided on the lower side of the respiratory filter 5. Both are provided to fix the respiratory filter 5.

  FIG. 2 shows a view of only the cover portion of the electronic control device according to the present invention.

  The shape of the processus | protrusion (large) 11 and processus | protrusion (small) 12 which fix (support) the respiratory filter of this invention is shown.

  The role of this protrusion is fixed in order to prevent the respiration filter from sliding sideways when the pressure jet from the high-pressure washing directly hits the respiration filter and slides in the lateral direction. Support). Further, the protrusion (small) 12 is provided on the lower side of the breathing filter, and this is also fixed from the lower side of the breathing filter when the pressure jet by the high pressure washing directly hits the breathing filter and tilts obliquely. It is fixed (supported) so that the pressure jet does not directly hit the O-ring of the breathing filter. As described above, by providing a plurality of projections (large) in a radial pattern (three or more), when attaching the electronic control device 1 to the vehicle, the drainage of water and foreign matters, and the stopping without restricting the direction, posture or position. The prevention is more reliable. The protrusion (small) is provided in a circular shape. Further, the protrusions (small) are not continuous circles to prevent water from stopping, but notches are provided at several protrusions (small).

  3 and 4 are explanatory diagrams of problems to be solved by the present invention.

  Reference numeral 11 denotes a conventional electronic control device. Reference numeral 6 denotes a conventional waterproof structure cover. Reference numeral 3 denotes a base which is a part of a waterproof case of the electronic control device. When these are integrated and accompanied by a seal structure, an electronic control device that maintains waterproofness is obtained.

  The cover 2 and the base 3 contain a printed wiring board on which electronic components are mounted, and a connector 4 is mounted. Reference numeral 5 denotes a breathing filter provided to absorb the pressure difference between the inside and outside of the electronic control unit 11 and to breathe when a pressure difference between the inside and outside of the electronic control unit 11 occurs. The breathing filter 5 is expected to tilt when a pressure jet from high pressure washing directly hits from the side or obliquely upward (see FIG. 4).

  When the breathing filter 5 is tilted in this way, the surface thickness on the O-ring 53a side is reduced, pushed by the water pressure of high-pressure washing, and a minute gap is generated by shifting from the steady position, so that water enters the electronic control unit 11. There is a fear.

  FIG. 5 shows an explanatory diagram of the effect of the present invention.

  A protrusion (large) 11 is provided on the side surface of the respiratory filter 5, and a protrusion (small) 12 is provided on the lower side. For this reason, even when the pressure jet by high-pressure washing directly hits the breathing filter 5 from the side or obliquely from above, the breathing filter 5 does not slide in the lateral direction or tilt obliquely. For this purpose, the height of the upper end of the protrusion (large) 11 may be raised or lowered from the head of the breathing filter 5 with the breathing filter 5 in a properly mounted state, but the height hitting the breathing filter 5 ( Position).

  FIG. 6 shows the shape of the protrusions in the present invention.

  As shown in (a) to (c), the shape of the protrusion (large) may be any of a cylindrical shape, a square shape, a triangular plate shape, or a three-dimensional protrusion. As shown in (d) to (f), the shape may be any of a semicircular shape, a triangular shape, a square plate shape, or a solid projection.

The figure which shows one Embodiment of the electronic control apparatus and waterproof case of this invention. The figure which shows embodiment of the cover of the electronic control apparatus of this invention. The figure which shows the structure of the conventional electronic control apparatus and a waterproof case. FIG. 7 is a detailed diagram for explaining problems of a conventional electronic control device. FIG. 5 is a detailed diagram illustrating the effect of the electronic control device of the present invention. The figure which shows the shape of the protrusion of this invention.

Explanation of symbols

1 Electronic Control Unit 2 Cover 3 Base 4 Connector 5 Respiratory Filter 6 Conventional Cover 11 Projection (Large)
12 Protrusion (small)
51 Housing 52 GORE-TEX membrane 53 O-ring

Claims (6)

A waterproof case that houses a printed circuit board on which electronic components are mounted;
In a vehicle-mounted electronic control device comprising a breathing filter for breathing inside and outside of the waterproof case provided in the waterproof case,
In the attachment part of the respiratory filter,
A plurality of first protrusions provided to surround the respiratory filter;
A plurality of second protrusions provided between a bottom surface portion of the respiratory filter and the waterproof case;
The electronic control device according to claim 1, wherein the second protrusion has a lower height than the first protrusion. In claim 1,
The projection is formed in a convex shape on the waterproof case. In claim 2,
The electronic control device according to claim 1, wherein the first protrusion is disposed outside the respiratory filter and is provided diagonally or radially. In claim 1,
The electronic control device according to claim 1, wherein the second protrusion is provided on a bottom surface portion of the respiratory filter. In claim 1,
The first protrusion and the second protrusion support the displacement of the respiratory filter by a high-pressure pressure jet from a high-pressure washing machine from the side or the lower side, and an O-ring is generated by the displacement of the respiratory filter. An electronic control device that prevents water from entering the inside of the waterproof case from a gap generated in a gap between the waterproof case and the waterproof case. In claim 1,
The first protrusion and / or the second protrusion is a protrusion having a cylindrical shape, a prismatic shape, or a triangular plate shape,
The first protrusion is provided along the outer periphery of the breathing filter, and the second protrusion is larger than the outer periphery of the O-ring and smaller than the outer periphery of the breathing filter, with respect to the center of the circle of the breathing filter arrangement portion. And an electronic control device provided along a concentric circumference.

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