JP2018082016A - Electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control device which can easily prevent moisture from entering into a housing without increasing work hours and costs.SOLUTION: An electronic control device (10) is formed with a cap (11) fitted in a vent hole formed on an upper surface of a housing (12) through an O ring (113). The cap (11) includes a cover (112a) for preventing moisture discharged from an exterior part from directly reaching the O ring (113).SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic control device, and is particularly suitable for application to an electronic control device for controlling the operation of a vehicle.

  2. Description of the Related Art Conventionally, there has been known an electronic control device in which a vent hole for adjusting internal pressure is formed in a casing that protects an electronic substrate, and a cap is fitted into the vent hole via an O-ring. The cap is configured to prevent moisture from entering from the outside while adjusting the internal pressure by ensuring air permeability inside and outside the housing.

  Patent Document 1 discloses an electronic control device in which a water repellent material such as silicone oil is applied to a fitting portion including an O-ring between a vent hole and a cap, and a surface treatment layer is formed on the fitting portion. It is disclosed.

  By this surface treatment layer, moisture can be prevented from entering from a contact portion where the O-ring and the housing are in contact, and corrosion of the housing at the contact portion between the O-ring and the housing can be prevented. . Thus, it is possible to prevent moisture from passing through the O-ring and entering the vent hole.

  Patent Document 2 discloses an electronic control device in which protrusions are formed on the outer surface of a casing so as to surround a cap attached to a vent hole of the casing. By this protrusion, the gap between the outer surface of the housing and the lower end of the cap can be narrowed. Therefore, for example, it is possible to prevent water vapor from entering through the gap during washing with high-pressure steam.

JP2015-003621A JP 2004-090875 A

  However, the configurations described in Patent Documents 1 and 2 have a problem that labor and cost increase. Specifically, in the configuration described in Patent Document 1, it takes time and cost to form a surface treatment layer by applying silicon oil, and in the configuration described in Patent Document 2, it takes time to process the housing to provide a protrusion. And costly.

  Further, as a problem other than the above, for example, in the configuration described in Patent Document 1, it is difficult to visually recognize the surface treatment layer. That is, it is difficult to determine whether or not there is a deficiency at the initial stage when the surface treatment layer is formed, and whether or not the surface treatment layer is deteriorated during, for example, inspection after a certain period of time. Therefore, when there is a defect or deterioration, moisture may enter the housing.

  In addition, in the configuration described in Patent Document 2, the intrusion of water vapor is suppressed by narrowing the gap between the outer surface of the housing and the lower end of the cap. However, depending on the attachment position or angle of the electronic control device, it is narrow. In some cases, water vapor easily passes through the gap. Since the water vapor that has passed through is difficult to return to the outside due to the protrusions, there is a risk of moisture entering the inside of the housing.

  The present invention has been made in consideration of the above points, and proposes an electronic control device that can easily prevent moisture from entering the housing without increasing labor and cost.

In order to solve this problem, in the present invention,
In the electronic control device (10) in which the cap (11) is fitted via the O-ring (113) to the vent hole formed in the upper surface of the housing (12), the cap (11) is A cover (112a) for preventing water from the outside from directly reaching the O-ring (113) is provided.

  According to the present invention, it is possible to easily prevent moisture from entering the housing without increasing labor and cost.

1 is an overall configuration diagram of a vehicle. It is an external appearance block diagram of an electronic controller. It is a cross-sectional block diagram of the cap before attachment. It is a section lineblock diagram of a cap at the time of attachment. It is a side block diagram of a cap.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The scope of the present invention is not limited to the embodiment described below.

  FIG. 1 shows the overall configuration of the vehicle 1. The vehicle 1 here is assumed to be a large vehicle such as a truck, but is not necessarily limited thereto, and may be a general vehicle such as a sedan.

  In the case of a large vehicle, the height from the ground contact surface of the tire to the uppermost roof is high, but the installation position of the electronic control device 10 is almost the same as that of a general vehicle, or rather is lower than the general vehicle. . In this case, the electronic control unit 10 is greatly affected by water due to a pool of water accumulated on the ground or a lower car wash.

  FIG. 2 shows an external configuration of the electronic control device 10. The electronic control device 10 is called an ECU (Engine Control Unit) or a TCU (Transmission Control Unit), for example, and is a device that electrically controls the engine operation and the shift operation of the vehicle 1. In the electronic control device 10 here, a ventilation hole is formed on the upper surface of the housing 12, and a cap 11 is fitted into the ventilation hole via an O-ring so as to close the ventilation hole.

  FIG. 3A shows a cross-sectional configuration of the cap 11 before being attached to the housing 12. FIG. 3B shows a cross-sectional configuration of the cap 11 after being attached to the housing 12. The cap 11 includes an upper member 111 and a lower member 112, and is fitted by inserting the lower member 112 into the vent hole via the O-ring 113. The filter film 114 is provided on the upper portion of the lower member 112 and blocks air from entering by allowing air to pass therethrough.

  The cap 11 is formed with covers 111 a and 112 a for preventing external water (including muddy water and salt water) from reaching the O-ring 113 directly. The cover 111a is formed so that a part of the upper member 111 extends downward, and the cover 112a is formed so that a part of the lower member 112 extends downward.

  Here, the covers 111a and 112a are formed so as to extend downward from the upper member 111 and the lower member 112, respectively. However, the present invention is not limited to this, and for example, either the upper member 111 or the lower member 112 is used. It may be formed so as to extend downward.

  The covers 111a and 112a are formed with a predetermined angle with respect to the straight line in the axial direction here. That is, it is formed so as to have an inclination, but is not necessarily limited thereto, and may be formed to be parallel to an axial straight line, for example.

  The covers 111a and 112a have an axial length H1 from the upper end of the O-ring 113, and the length H1 is formed to be smaller than the axial length H2 of the O-ring 113. The length H1 is formed to be equal to or smaller than the axial length H2a after the O-ring 113 is elastically deformed.

  FIG. 4 shows a side configuration of the cap 11. A plurality of holes 112b are formed in the cover 112a in a mesh shape. The hole 112b is provided to allow the water that has passed from the outside to escape to the outside even if part of the water that has been discharged from the outside passes through the covers 111a and 112a. The number and shape of the holes 112b are not limited to this.

  As described above, according to the present embodiment, the cap 11 is fitted into the vent hole formed on the upper surface of the housing 12, thereby preventing moisture from entering while ensuring air permeability. In addition to having a function, by providing the cap 111 with the covers 111a and 112a, it is possible to prevent water released from the outside from reaching the O-ring 113 directly.

  In this case, for example, high-pressure water directly hits the O-ring 113 during car washing and elastically deforms the O-ring 113, thereby passing water into the inside of the casing 12 through the gap between the O-ring 113 and the casing 12. Can be easily prevented.

  Even if water passes through the covers 111a and 112a, the amount and pressure of water on the O-ring 113 can be reduced. Furthermore, since the passed water can be easily returned to the outside through the plurality of holes 112b, the influence of the water on the O-ring 113 can be greatly reduced.

10 Electronic Control Unit 11 Cap 111 Upper Member 111a Cover 112 Lower Member 112a Cover 112b Hole 113 O-ring 114 Filter Membrane

Claims (4)

In the electronic control device (10) in which the cap (11) is fitted via the O-ring (113) to the vent hole formed in the upper surface of the housing (12).
The cap (11)
An electronic control device comprising a cover (112a) for preventing moisture from the outside from directly reaching the O-ring (113). The cover (112a)
The electronic control unit according to claim 1, wherein an axial length (H1) is formed to be smaller than an axial length (H2) of the O-ring (113). The cover (112a)
The length (H1) in the axial direction is the same as or smaller than the length (H2a) in the axial direction when the O-ring (113) is elastically deformed. Electronic control device. The cover (112a)
The electronic control device according to any one of claims 1 to 3, wherein the plurality of holes (112b) are formed in a mesh shape.

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