JPS6211009Y2 - - Google Patents

Description

[Detailed Description of the Invention] The purpose of this invention is to improve the robustness of a heat sink that dissipates heat generated when semiconductor devices such as rectifiers and transistors are used.

Conventionally, heat radiators for semiconductor devices have been known in which a heat radiator such as a metal rod or tube is embedded on the side surface of a metal substrate on which the device is attached. For example, slack tends to occur due to deformation of the metal tube, etc., and this slack causes poor thermal contact at the connecting portion, resulting in a reduction in heat dissipation efficiency.

However, in this invention, the heat radiator and the board are connected through a knurled rod that is inserted into a hole previously drilled in the board and fixed, so the connection between the heat radiator and the board is solid, and the above problem is solved. .

That is, to explain this invention with reference to the embodiment shown in FIGS. 1 and 2, holes 2, 2 are bored in one side of a substrate 1 made of an aluminum plate, and
2, insert and secure the base ends of the aluminum knurled rods 3, 3 into each of the knurled rods 3, 3.
The proximal ends of heat sinks 4, 4 made of aluminum tubes are fitted into the distal ends of the heat sinks. The knurled rod 3 has a diameter slightly larger than the inner diameter of the aluminum tube that constitutes the heat sink 4 (therefore, the hole 2 is also approximately the same as the inner diameter of the aluminum tube), and an annular flange 5 is formed in the middle part of its side wall. There is. However, hole 2
The annular collar 5 is pressed down when it is fitted and fixed.

According to the above embodiment, as a result of the knurling 3a of the knurled rod 3 biting into the inner wall of the hole 2 and the inner wall of the heat sink 4, the substrate 1 and the heat sink 4 are connected via the knurled rod 3. It is possible to connect firmly and obtain a robust heat sink. Further, since the knurled rod 3 is fully formed inside the base of the aluminum tube serving as the heat radiator 4, deformation of the tube wall can be prevented, and detachment due to deformation can also be prevented. Therefore, the thermal contact between the substrate 1 and the heat sink 4 is good, and high heat radiation efficiency can be exhibited.

Next, in the embodiment shown in FIG. 3, in contrast to the holes 2, 2 drilled in one side of the substrate 1 in the same manner as described above, the depth of the hole 2 is A knurled portion 7 formed to have approximately the same length as the radiator is fitted and fixed to form a heat radiator.

In this embodiment as well, the heat sink 6 and the substrate 1 are connected via the knurled rod formed by the knurled portion 7, and the same effects as in the previous embodiment can be obtained. In the figure, reference numeral 8 denotes an annular collar formed on the upper side of the knurled portion 7, and when the heat sink 6 is inserted into the hole 2, the annular collar 8 is pressed down.

In other words, according to this invention, since the substrate and the heat dissipation body made of tubes, rods, etc. are connected through the knurled rod, both are firmly fixed, resulting in a robust heat dissipation device, and the heat dissipation efficiency is also reduced. It has the effect of preventing

If the heat dissipation body is made of a metal pipe and the base end is fitted to the tip of the knurled rod, the knurled rod will be fully present inside the joint of the metal pipes, which will have the effect of preventing deformation of the metal pipe. There is. If the heat radiator is a metal rod and a knurled portion is formed at the base end thereof, there is an advantage that the number of parts can be avoided and the manufacturing process can be substantially the same as that of the conventional method. In addition, since an annular flange is formed on the side wall of the knurled portion, the knurled rod can be inserted into the hole by pressing down on this annular flange, which prevents deformation of the knurled rod itself and the metal rod during insertion. This has the effect of preventing deformation of the heat dissipation body, and limiting the amount by which the knurled rods are pressed down, making it possible to press down a plurality of knurled rods by the same amount.

[Brief explanation of the drawing]

Figure 1 is a partial plan view of an embodiment of this invention;
The figure is a partially cutaway front view of the embodiment (also showing a state in the middle of manufacturing), and FIG. 3 is a partially cutaway front view of another embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Board, 2... Hole, 3... Knurled rod, 4, 6... Heat sink, 5, 8... Annular collar, 7...
...Rolled part.

Claims (1)

[Claims for Utility Model Registration] 1. In a heat radiator comprising a large number of heat radiators embedded on the side surface of a metal substrate, the heat radiators and the metal substrate:
A radiator characterized in that the heat sink is connected via a knurled rod that is fitted and fixed into a hole drilled in a metal substrate, and that the knurled rod has an annular flange provided at an intermediate portion of a side wall thereof. 2. The heat radiator according to claim 1, wherein the heat radiator is made of a metal pipe, and the base end of the pipe is fitted into the tip of the knurled rod. 3. The heat radiator according to claim 1, wherein the heat radiator is constituted by a metal rod, and a knurl is formed on the side wall of the proximal end of the metal rod.