JP6076872B2 - Electronic control unit - Google Patents

Description

  The present invention relates to an electronic control device mounted on a vehicle such as an engine control unit or an automatic transmission control unit.

  Generally, in an electronic control device mounted on a vehicle, a cover and a base covering the electronic control device are fixed with a base fixing screw (for example, see Patent Document 1).

JP 2006-86536 A

  In the structure of the electronic control device as disclosed in Patent Document 1, there is a problem that the base fixing screw is easily corroded by salt damage.

  Therefore, there is a method in which a resin base that is resistant to corrosion by salt water or the like is fixed to the cover using heat caulking and an adhesive without using a base fixing screw.

  However, in such a method, the heat caulking portion is exposed and easily damaged by an external force. On the other hand, if the heat caulking part is easily embedded in the cover, a problem of water accumulation occurs, which promotes corrosion of the cover.

  An object of the present invention is to provide an electronic control device capable of preventing water accumulation in a heat staking part while protecting a heat staking part that fixes a cover and a resin base from external force.

  To achieve the above object, the present invention provides a resin base having a boss, a cover having a hole through which the boss is inserted, an electronic component covered by the resin base and the cover, and an end of the boss. A heat staking part for fixing the cover and the resin base; a protective wall provided around the heat staking part; and a drain outlet for draining the liquid that has entered the protective wall. It is a thing.

  ADVANTAGE OF THE INVENTION According to this invention, the water staking in a heat caulking part can be prevented, protecting the heat caulking part which couple | bonds a cover and a resin base from external force. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a perspective view of an electronic control device according to a first embodiment of the present invention. It is a perspective view which shows the partial cross section of the electronic controller which is the 1st Embodiment of this invention. It is sectional drawing of the periphery of the screw for circuit board fixation used for the electronic controller which is the 1st Embodiment of this invention. FIG. 1B is a detailed view of the vicinity of the heat caulking portion shown in a range I surrounded by a circle in FIG. 1A. It is a partial cross section figure which follows the II-II line | wire shown by FIG. 1D. It is a block diagram of the modification of the electronic controller which is the 1st Embodiment of this invention. It is detail drawing of the periphery of the heat crimping part of the electronic control apparatus which is the 2nd Embodiment of this invention. It is a partial cross section figure which follows the IV-IV line | wire shown by FIG. 2A. It is the figure which looked at the heat crimping part 3a shown by FIG. 2A in the direction of the IV-IV line. It is a block diagram of the modification of the electronic controller which is the 2nd Embodiment of this invention. It is detail drawing of the periphery of the heat crimping part of the electronic control apparatus which is the 3rd Embodiment of this invention. It is a partial sectional view which meets a VI-VI line shown in Drawing 3A. It is the figure which looked at the heat crimping part shown by FIG. 3A in the direction of VI-VI line. It is a block diagram of the modification of the electronic controller which is the 3rd Embodiment of this invention. It is detail drawing of the periphery of the heat crimping part of the electronic controller which is the 4th Embodiment of this invention. It is a fragmentary sectional view which follows the VIII-VIII line shown by FIG. 4A. It is a block diagram of the modification of the electronic controller which is the 4th Embodiment of this invention.

(First embodiment)
Hereinafter, the configuration and operation of the electronic control unit 100A according to the first embodiment of the present invention will be described with reference to FIGS. 1A to 1E. The electronic control device controls, for example, a solenoid valve used in an automatic transmission.

  First, the configuration of the electronic control unit 100A will be described with reference to FIG. 1A. FIG. 1A is a perspective view of an electronic control unit 100A according to the first embodiment of the present invention.

  The electronic control device 100A includes an external connection connector 1, a cover 2, and a resin base 3. The cover 2 and the resin base 3 are fixed by a heat caulking portion 3a. The cover 2 is made of metal such as aluminum die casting. The external connection connector 1 and the resin base 3 are made of resin. A configuration around the heat caulking portion 3a shown in a circle I in FIG. 1A will be described later with reference to FIG. 1D.

  Next, the configuration of the electronic control unit 100A will be described with reference to FIG. 1B. FIG. 1B is a perspective view showing a partial cross section of the electronic control unit 100A according to the first embodiment of the present invention.

  The electronic control device 100 </ b> A includes a circuit board 4. An electronic component 4 a and an external connection connector 1 are mounted on the circuit board 4. The circuit board 4 is fixed to the cover 2 with circuit board fixing screws 6. The configuration around the circuit board fixing screw 6 will be described later with reference to FIG. 1C.

  A plurality of electronic components 4 a are mounted on the circuit board 4. A heat conductive material 4b is interposed between the mounted electronic component 4a and the cover 2. Heat generated from the electronic component 4a is transmitted to the cover 2 via the heat conducting material 4b, and is radiated from the surface of the cover 2 to the outside of the housing. In this embodiment, heat radiation grease is used as the heat conductive material 4b.

  An adhesive 5 is interposed between the cover 2 and the resin base 3 in order to keep the casing airtight. Further, the cover 2 and the resin base 3 are fixed by a heat caulking portion 3a. In this way, the electronic component 4 a is covered with the resin base 3 and the cover 2.

  Next, the configuration of the electronic control unit 100A will be described with reference to FIG. 1C. FIG. 1C is a cross-sectional view of the periphery of the circuit board fixing screw 6 used in the electronic control unit 100A according to the first embodiment of the present invention.

  The cover 2 is formed with a female screw (screw hole) that is screwed with the circuit board fixing screw 6. The circuit board 4 is formed with a hole through which the circuit board fixing screw 6 is inserted. The circuit board 4 is fixed to the cover 2 by inserting the circuit board fixing screw 6 through the hole of the circuit board 4 and screwing it into the female screw of the cover 2.

  Next, a characteristic configuration of the electronic control device 100A will be described with reference to FIG. 1D. FIG. 1D is a detailed view of the vicinity of the heat caulking portion 3a shown in a range I surrounded by a circle in FIG. 1A.

Two protective walls 2b (2b ₁ , 2b ₂ ) are provided around the heat caulking part 3a. The protective wall 2b is formed on the surface of the cover outer peripheral portion 2a of the cover 2 and protrudes in a direction perpendicular to the surface (z-axis direction). Thereby, it can prevent that the exposed heat crimping part 3a is damaged by the external force added from the outside.

  The protective wall 2b is provided with a partial drain port 10 for draining water (liquid such as salt water) that has entered the protective wall 2b. In other words, the drain port 10 is a notch provided in the protective wall. Thereby, it can prevent that the cover 2 corrodes by water pools, such as salt water.

In addition, the cover outer peripheral part 2a shown to FIG. 1D functions also as an attachment part to a vehicle. Inserting the bolt into the hole H ₁ provided in the cover peripheral portion 2a, by tightening the bolts in the tool, the electronic control unit 100A is fixed to the vehicle. In the present embodiment, the heat caulking portion 3a and the protective wall 2b are arranged so as to avoid interference with the tool.

  Next, the configuration around the heat caulking portion 3a shown in FIG. 1D will be described with reference to FIG. 1E. FIG. 1E is a partial cross-sectional view taken along the line II-II shown in FIG. 1D.

The inside of the cover 2 of the protective wall 2b, holes H ₂ boss 3b of the resin base 3 is inserted is formed. Inserting the boss 3b of the resin base 3 into the hole of H ₂ cover 2 by a boss 3b thermoforming, thermal caulking portion 3a is formed at an end portion of the boss 3b. Thereby, the cover 2 and the resin base 3 are fixed by the heat caulking part 3a.

  The protective wall 2b is formed on the surface of the cover 2, and protrudes in a direction (z-axis direction) perpendicular to the surface S1 where the cover 2 and the resin base 3 are in contact.

  Water that enters between the heat caulking portion 3a and the protective wall 2b is drained from the drainage groove 10. Thereby, water pool does not generate | occur | produce and the corrosion of the cover 2 can be prevented.

  The distance D12 between the surface S2 of the cover 2 inside the protective wall 2b and the surface S1 where the cover 2 and the resin base 3 are in contact is the distance between the surface S3 and the surface S1 of the cover 2 outside the protective wall 2b. Smaller than D13.

  As described above, according to this embodiment, it is possible to prevent water accumulation in the heat staking part while protecting the heat staking part that fixes the cover and the resin base from external force.

(Modification of the first embodiment)
Next, a modified example of the electronic control unit 100A will be described with reference to FIG. 1F. FIG. 1F is a configuration diagram of a modified example of the electronic control unit 100A according to the first embodiment of the present invention.

  The cover 2 includes an inclined portion 2c around the heat caulking portion 3a. That is, the surface of the cover 2 inside the protective wall 2b is formed of a conical surface coaxial with the axis of the boss 3b. Thereby, a water pool can be further prevented.

(Second Embodiment)
Next, a characteristic configuration of the electronic control device 100B will be described with reference to FIG. 2A. FIG. 2A is a detailed view of the vicinity of the heat caulking portion 3a of the electronic control unit 100B according to the second embodiment of the present invention.

In FIG. 2A, as compared with FIG. 1D, four protective walls 2b (2b ₁₁ , 2b _12, 2b ₁₃ , 2b ₁₄ ) are provided around the heat caulking portion 3a. The protective wall 2 b is formed on the surface of the cover outer peripheral portion 2 a of the cover 2. Thereby, it can prevent that the exposed heat crimping part 3a is damaged by the external force added from the outside.

  A drain port 10 is provided between the adjacent protective walls 2b. Thereby, it can prevent that the cover 2 corrodes by water pools, such as salt water.

  Note that the cover outer peripheral portion 2a shown in FIG. Therefore, in this embodiment, it is not necessary to arrange the heat caulking portion 3a and the protective wall 2b so as to avoid interference with the tool.

  Next, the configuration around the heat caulking portion 3a shown in FIG. 2A will be described with reference to FIGS. 2B to 2C. 2B is a partial cross-sectional view taken along line IV-IV shown in FIG. 2A. FIG. 2C is a view of the heat caulking portion 3a shown in FIG. 2A when viewed in the direction of the IV-IV line.

  As shown in FIGS. 2B and 2C, a protective wall 2b is provided around the heat-caulking portion 3a so that the heat-caulking portion 3a is buried after the boss 3b of the resin base 3 is thermoformed. That is, the distance D14 between the surface S1 where the cover 2 and the resin base 3 are in contact with the end surface S4 of the protective wall 2b parallel to the surface S1 is larger than the distance D15 between the surface S1 and the end surface S5 of the boss 3b parallel to the surface S1. .

  Thereby, it can further prevent that the exposed heat crimping part 3a is damaged by the external force applied from the outside.

  As described above, according to this embodiment, it is possible to prevent water accumulation in the heat staking part while protecting the heat staking part that fixes the cover and the resin base from external force.

(Modification of the second embodiment)
Next, a modification of the electronic control device 100B will be described with reference to FIG. 2D. FIG. 2D is a configuration diagram of a modification of the electronic control device 100B according to the second embodiment of the present invention.

  The cover 2 includes an inclined portion 2c around the heat caulking portion 3a. Thereby, a water pool can be further prevented.

(Third embodiment)
Next, a characteristic configuration of the electronic control unit 100C will be described with reference to FIG. 3A. FIG. 3A is a detailed view of the vicinity of the heat caulking portion 3a of the electronic control unit 100C according to the third embodiment of the present invention.

  In FIG. 3A, compared with FIG. 2A, a cylindrical protective wall 2b is provided around the heat caulking portion 3a. The protective wall 2b is formed on the surface of the cover outer peripheral portion 2a. Thereby, it can prevent that the exposed heat crimping part 3a is damaged by the external force added from the outside. Moreover, since the protective wall 2b is cylindrical, salt water etc. do not flow in from the outer side to the inner side of the protective wall 2b.

  In FIG. 3A, the drain port 10 is formed in the cover 2 inside the protective wall 2b. The drain port 10 is connected to the drain hole 10a. The configuration of the drain hole 10a will be described later with reference to FIG. 3B.

  Next, the configuration around the heat caulking portion 3a shown in FIG. 3A will be described with reference to FIGS. 3B to 3C. 3B is a partial cross-sectional view taken along the line VI-VI shown in FIG. 3A. FIG. 3C is a view of the heat caulking portion 3a shown in FIG. 3A when viewed in the direction of the VI-VI line.

  A protective wall 2b is provided around the heat caulking portion 3a so that the heat caulking portion 3a is buried after the boss 3b of the resin base 3 is thermoformed. Thereby, it can prevent that the exposed heat crimping part 3a is damaged by the external force added from the outside.

  The resin base 3 is provided with a drainage path 3 c connected to a drainage hole 10 a provided in the cover 2. Thereby, the salt water etc. which entered the inside of the cylindrical protective wall 2b are drained through the drain port 10C of the cover 2 and the drain path 3c of the resin base 3.

  As shown in FIG. 3B, the axis of the drain hole 10a provided in the cover 2 is perpendicular to the surface S1 where the cover 2 and the resin base 3 are in contact. On the other hand, the axis of the drainage path 3c provided in the resin base 3 is parallel to the surface S1.

  As described above, according to this embodiment, it is possible to prevent water accumulation in the heat staking part while protecting the heat staking part that fixes the cover and the resin base from external force.

(Modification of the third embodiment)
Next, a modified example of the electronic control apparatus 100C will be described with reference to FIG. 3D. FIG. 3D is a configuration diagram of a modified example of the electronic control unit 100C according to the third embodiment of the present invention.

  The cover 2 includes an inclined portion 2c around the heat caulking portion 3a. Thereby, a water pool can be further prevented.

(Fourth embodiment)
Next, a characteristic configuration of the electronic control device 100D will be described with reference to FIG. 4A. FIG. 4A is a detailed view of the vicinity of the heat caulking portion 3a of the electronic control unit 100D according to the fourth embodiment of the present invention.

  As shown in FIG. 4A, a protective wall 3d (convex shape) is provided around the heat caulking portion 3a. However, in FIG. 4A, the protective wall 3d is formed on the resin base 3 as compared to FIGS. 1D, 2A, and 3A. Thereby, it can prevent that the exposed heat crimping part 3a is damaged by the external force added from the outside.

  A partial drain 10 is provided in the protective wall 3d. Thereby, it can prevent that the cover 2 corrodes by water pools, such as salt water.

  Next, the configuration around the heat caulking portion 3a shown in FIG. 4A will be described with reference to FIG. 4B. 4B is a partial cross-sectional view taken along line VIII-VIII shown in FIG. 4A.

  The protective wall 3d is formed on the resin base 3 and protrudes in a direction perpendicular to the surface S1 where the cover 2 and the resin base 3 are in contact. Further, the protective wall 3d is provided outside the side surface SF of the cover 2.

  As described above, according to this embodiment, it is possible to prevent water accumulation in the heat staking part while protecting the heat staking part that fixes the cover and the resin base from external force.

(Modification of the fourth embodiment)
Next, a modification of the electronic control device 100D will be described with reference to FIG. 4C. FIG. 4C is a configuration diagram of a modified example of the electronic control unit 100D according to the fourth embodiment of the present invention.

  The cover 2 includes an inclined portion 2c around the heat caulking portion 3a. Thereby, a water pool can be further prevented.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. The above-described embodiments are illustrative of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  For example, in FIG. 3B, the cover 2 and the drainage path 3c are combined to function as a drainage pipe, but an independent drainage hole may be provided in the resin base 2.

DESCRIPTION OF SYMBOLS 1 ... Connector for external connection 2 ... Cover 2a ... Cover outer peripheral part 2b ... Protective wall 2c ... Inclined part 3 ... Resin base 3a ... Heat caulking part 3b ... Boss 3c ... Drainage path 3d ... Protective wall (convex shape)
DESCRIPTION OF SYMBOLS 4 ... Circuit board 4a ... Electronic component 4b ... Thermal conduction material 5 ... Adhesive 6 ... Circuit board fixing screw 10 ... Drain port 10a ... Drain hole 100A, 100B, 100C, 100D, ... Electronic control unit

Claims (9)

A resin base having a boss;
A cover having a hole through which the boss is inserted;
An electronic component covered by the resin base and the cover;
A heat caulked portion that is formed at an end of the boss and fixes the cover and the resin base;
A protective wall provided around the heat caulked portion;
A drain outlet for draining liquid that has entered the inside of the protective wall;
An electronic control device comprising: The electronic control device according to claim 1,
The protective wall is
An electronic control device, wherein the electronic control device is formed on the cover and protrudes in a direction perpendicular to a surface where the cover and the resin base are in contact with each other. The electronic control device according to claim 1,
The drain outlet is
An electronic control device characterized by being a notch provided in the protective wall. The electronic control device according to claim 1,
The cover is
An electronic control device comprising an inclined portion around the heat caulking portion. The electronic control device according to claim 1,
The protective wall is cylindrical;
The drain outlet is
Formed on the cover inside the protective wall;
The cover is
Having a drainage hole connected to the drainage port;
The resin base is
An electronic control device comprising a drainage path connected to the drainage hole. The electronic control device according to claim 1,
The protective wall is
An electronic control device, wherein the electronic control device is formed on the resin base and protrudes in a direction perpendicular to a surface in contact with the cover and the resin base. The electronic control device according to claim 6,
The protective wall is
The electronic control device is provided outside the side surface of the cover. The electronic control device according to claim 1,
The distance D12 between the surface S2 of the cover inside the protective wall and the surface S1 where the cover and the resin base are in contact with each other is a surface S3 of the cover outside the protective wall, the cover and the resin base. Is smaller than the distance D13 with the surface S1 in contact with the electronic control device. The electronic control device according to claim 1,
The distance D14 between the surface S1 where the cover and the resin base are in contact and the end surface S4 of the protective wall parallel to the surface S1 is greater than the distance D15 between the surface S1 and the end surface S5 of the boss parallel to the surface S1. An electronic control device.

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