JPH075675Y2 - Totally closed control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fully closed type control unit by die casting integral molding.

[Prior Art] Conventionally, a fully-closed type control unit formed by die-casting integral molding has a control circuit board 2 provided inside a unit case 1 and an optional component 3 provided outside the unit case 1 as shown in FIG. 3, for example. In order to connect with, the lead through hole 4 was provided on the side surface or the bottom surface of the unit case 1 and the lead wire 5 was passed through. When the option component 3 is not provided, the lead through hole 4 is closed by a rubber bushing 6 having flexibility.

[Problems to be Solved by the Invention] By the way, since the control circuit board 2 in the unit case 1 is provided with the electronic components 21 such as power elements and resistors that generate heat, the heat generated from the electronic components 21 The heat sink 22 that absorbs heats up, the temperature of the unit case 1 itself to which the heat sink 22 is attached rises, and the bushing 6 attached as a lid that closes the lead through hole 4 melts or is thermally deteriorated for a long time. There was a drawback that it could not be used.

It is an object of the present invention to provide a unit which allows a through hole to be easily drilled when an optional part is attached and which is normally of a closed type without using a bushing.

[Means for Solving the Problems] The present invention is a fully closed type including a unit case integrally molded by die casting, a heat sink fixed in the unit case, and an electronic component provided on the heat sink. In the control unit, a protrusion is provided on a bottom surface or a side surface of the unit case, and a cross section formed at a substantially circular boundary between the protrusion and the unit case is formed thinner than a wall thickness of the unit case. .

[Operation] Since the cross section of the boundary between the protrusion and the side or bottom of the unit case is formed in a thin circular shape, it can be easily folded by pressing it by hand or by tapping it lightly with a hammer. Thereby, the lead through hole can be formed.

[Embodiment] An embodiment of the present invention shown in the drawings will be described.

FIG. 1 is a front sectional view of an embodiment of the present invention, in which an electronic component 21 of a control circuit board 2 is provided in a unit case 1 integrally molded by die casting, and the electronic component 21 generating heat is the unit case 1 It is fixed on the heat sink 22 which is fixed inside. A conical protrusion 11 is provided on the bottom surface of the unit case 1. As shown in FIG. 2, the cross section of a boundary 12 formed in a substantially circular shape between the protrusion 11 and the bottom surface of the unit case 1 is thinner than the wall thickness of the unit case 1, and a protrusion is formed at the tip of the protrusion 11. When a force is applied in the direction of tilting the portion 11, the boundary 12 is cracked and is broken from the boundary 12 to form the lead through hole 4 shown by a chain line.

Therefore, if the optional component 3 is not attached,
The lead through hole 4 is blocked by the protrusion 11 and
The protrusions 11 increase the cooling area of the unit case 1 and serve as cooling fins to enhance the cooling effect.

When installing the optional component 3, use the projection 11 as the boundary.
The lead through hole 4 is formed by folding and removing from 12. Then, the lead wire 5 between the inside of the unit case 1 and the option component 3 is passed through the lead through hole 4.

The boundary 12 between the protrusion 11 and the bottom surface of the unit case 1
Since it has a thin circular shape, it can be easily removed by pressing it with a hand or lightly hitting it with a hammer, if necessary.

[Advantage of Invention] As described above, according to the present invention, when an optional component is used, the lead through hole can be formed by simply breaking off the protruding portion as necessary. There is an effect that a lid is not required, an extra material and an attachment process can be saved, and when an optional component is not used, a cooling effect is enhanced by the protrusion.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing an essential part, and FIG. 3 is a front sectional view showing a conventional example. 1 …… Unit case, 11 …… Projection part, 12 …… Boundary, 2
...... Control circuit board, 21 ...... Electronic parts, 22 ...... Heat sink, 3 ...... Optional parts, 4 ...... Lead through hole, 5 ...
…Lead

Claims (2)

[Scope of utility model registration request] 1. A fully closed control unit comprising a unit case integrally formed by die casting, a heat sink fixed in the unit case, and an electronic component provided on the heat sink, comprising: A fully closed control unit, wherein a protrusion is provided on a bottom surface or a side surface, and a cross section formed at a substantially circular boundary between the protrusion and the unit case is formed thinner than a wall thickness of the unit case. 2. The projection is formed in a conical shape.
All-closed control unit described.