JPH0622994Y2 - Fixed structure of heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a structure for fixing an element such as an output transistor (heat generating element) that generates a large amount of heat to a radiator plate provided upright on a printed board.

<< Prior Art >> A heat generating element such as an output transistor is usually attached and fixed to a heat radiating plate provided upright on a printed board to dissipate heat generated during operation. In the past, it was common to insert an insulating sheet into the mounting hole provided in the heating element and screw it to the heat sink, but in order to increase the insulation stability, put the entire element into a cap and insert a spring. The structure of fixing with plate-made fixing metal fittings is widely adopted.

5 and 6 show a conventional fixing structure. In the structure shown in FIG. 5, vertical retaining holes 8 are provided on both sides of the heat generating element mounting portion 9 of the heat radiating plate 2 erected on the printed board 1, the spring plate is bent into an M shape, and both ends thereof are hooked. Using the fixing metal fitting 11 having the portion 16, the hook portions 16 at both ends of the fixing metal fitting are inserted and locked in the retaining holes 8 and the heat generating element 4 covered with the insulating cap 7 by the central pressing portion 13 is attached to the heat radiating plate 2. It is pressed against and held.

In the structure shown in FIG. 6, the spring plate is bent into an inverted triangle, and both ends of the spring plate are outwardly curved to form the pressing portion 13.
The heat-generating element 4 covered with the insulating cap 7 is attached to the heat-dissipating plate 2, and the fixing metal fitting 11 is inserted from above the heat-dissipating plate 13 while expanding the pressing portion 13 to sandwich the heat-dissipating plate 2 and the heat-generating element 4. And hold it.

<Problems to be solved by the invention> However, in the structure of FIG. 5, the hooks 16 of the fixing metal fittings are hooked on the hook holes 8 on both sides of the heating element 4 to generate heat by the elastic force of the central pressing portion 13. Since the element 4 is pressed against the heat sink 2, when a sufficient elastic force is applied to the fixture 11, the width a of the fixture is widened, and the width of the heat sink 2 is also widened to mount the printed board 1 thereon. There is the problem of reducing space. In addition, there is a problem in that the fixing metal fitting 11 must be pushed in simultaneously behind the hook portions 16 on both sides when it is mounted on the heat dissipation plate 2.

On the other hand, in the structure shown in FIG. 6, in order to give a sufficient elastic force to the fixing member 11, its width a must be widened. There is a problem that it greatly protrudes, and a large force is required to expand the pressing portion 13, so that the fixing bracket 11
There is a problem that the installation work of is troublesome.

The present invention aims to solve the above problems,
An object of the present invention is to provide a fixing structure in which the heat generating elements can be arranged on the heat radiating plate at a narrow interval and can be fixed to the heat radiating plate by a simple operation.

<< Means for Solving the Problems >> The fixing structure of the heating element of the present invention is a fixing member 1 made of a spring plate.
1 is to press the heating element 4 against the heat dissipation plate 2. The heat dissipation plate 2 is provided with a hook hole 8 above the heating element mounting portion 9. The fixing metal fitting 11 is a spring plate whose central portion 1
2 is bent to form an inverted L shape, a pressing portion 13 for pressing the heating element 4 is formed on one bent edge, and the other bent is bent outward with a strip piece 14 left in the middle thereof. The receiving portion 15 is formed, and the hook portion 16 that engages with the hooking hole is formed at the tip of the remaining strip piece 14. The hook portion 16 of the fixing member 11 is inserted into the retaining hole 8 of the heat radiating plate 2 and hooked on the back surface side, and the heat generating element 4 is pressed against the heat radiating plate 2 by the pressing portion 13 of the fixing member 11.

<< Operation >> The heat generating element 4 covered with the insulating cap 7 is attached to the heat radiating plate 2, and the hook 16 of the fixing metal fitting 11 is aligned with the hooking hole 8 from the front of the heat generating element 4 and the central bent portion 12 of the fixing metal fitting 12 is fitted. Press with pliers. Then, the hook portion 16 passes through the hook hole 8 and is hooked on the back surface side, and the fixing metal fitting 11 is locked to the heat dissipation plate 2. At this time, the receiving portion 15 is attached to the surface of the heat dissipation plate 2,
The pressing portion 13 presses the heating element 4 against the heat dissipation plate 2. In this fixed state, the hook 16 is fixed to the fixing bracket 11 from the heat sink 2.
Is prevented from falling off, and the receiving portion 15 supports the moment of the reaction force received by the pressing portion 13.

<< Embodiment >> FIGS. 1 to 3 show an embodiment of a fixing structure for a heating element according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a side view showing dimensional relationships, and FIG. FIG. 3 is a side view showing a mounted state. In the figure, 1 is a printed board, 2 is a heat sink fixed to the printed board 1 with screws 3, 4 is an output transistor attached to the heat sink 2, and its lead pin 5 is inserted into a through hole 6 of the printed board. Have been soldered. 7 is an insulating cap that is attached to the transistor 4 from above, 8
Is a locking hole formed above the transistor mounting portion 9 of the heat sink 2, 10 is a locking hole formed immediately above the locking hole 8,
Reference numeral 11 is a fixture for fixing the transistor 4.

The fixing metal fitting 11 is formed by bending the central portion 12 of the spring plate into an inverted L shape, bending one of the bent edges outward to form the pressing portion 13, and forming the strip 14 at the middle of the other. The remaining strips 14 are bent at a right angle to the outside to form the receiving portion 15, and the tips of the remaining strips 14 are bent to the inside to form a hook portion 16. Further, the leading ends of the receiving portions 15 are bent at the inside. It is bent to form a stopper piece 17. The gap T between the hook holes 8 formed in the heat dissipation plate 2 is formed to be slightly wider than the thickness t of the hook 16 of the fixing fitting, and the distance between the wall surfaces of the hook hole 8 and the lock hole 10 on the far side. D is slightly smaller than the distance d between the tips of the hook portion 16 and the stopper piece 17 of the fixing fitting.

To fix the transistor 4 to the heat sink 2 with the fixing bracket 11, the transistor 4 covered with the insulating cap 7 is attached to the heat sink 2, and the hook portion 16 of the fixing bracket 11 is aligned with the hook hole 8 of the heat sink. And push in the central bent portion 12 with pliers or the like. Then, the hook portion 16 passes through the locking hole 8, is pushed by the stopper piece 17 inserted into the locking hole 10 and moves downward, and is locked to the back side of the heat dissipation plate 2. At the same time, the pressing portion 13 presses the transistor 4, and the receiving portion 15 is attached to the heat dissipation plate 2.
In the mounted state shown in FIG. 3, the hook portion 1 engaged with the retaining hole 8
Since 6 is pushed downward by the stopper piece 17, the fixing metal fitting is completely prevented from falling off, the moment of the pressing reaction force is received by the receiving portion 15, and the transistor 4 is strongly pushed to the heat sink 2 by the holding portion 13. It is pressed and fixed. The flexibility of the receiving portion 15 also increases the flexibility of the pressing portion 13, so that the pressing portion 13 can be given sufficient elasticity.

FIG. 4 shows another example of the fixing metal fitting used in the fixing structure of the present invention, in which both corners of the tip of the receiving portion 15 are bent inward to form the claw piece 19. When the fixing metal fitting 11 having such a structure is used, it is not necessary to provide the locking hole 10 in the heat dissipation plate 2, which is convenient. In the embodiment shown in FIGS. 1 to 3, the stopper piece 17 and the claw piece 19 act to prevent the hook portion 16 from falling out of the hook hole 8. This structure has a receiving portion. Insert a screwdriver or the like between the heat sink 15 and the heat radiating plate 15 to engage the stopper piece 17
Although there is a feature that the fixing metal fitting 11 can be easily removed by removing it from 0, the gap T of the hooking hole 8 is slightly narrower than the thickness t of the hook portion 16 when such consideration is not necessary. Accordingly, the stopper piece 17 and the claw piece 19 may be omitted.

<Effect of device> As described above, in the fixing structure of the present invention, since the heat dissipation plate and the fixing bracket are locked at one place above the heat generating element, the heat generating elements can be arranged at a narrow interval, and the heat dissipation can be improved. The board can be made narrower, so that the area occupied by the heat dissipation plate on the printed board can be reduced. Further, the heating element can be attached to the heat radiating plate by a simple operation of pushing in one portion of the fixing metal fitting with pliers or the like, and the work of fixing the heating element becomes extremely simple. Further, the structure of the illustrated embodiment is characterized in that the fixing metal fitting is stably held by the heat radiating plate and can be easily removed.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a side view showing dimensional relations, and FIG. 3 is a side view in a mounted state. . FIG. 4 is a perspective view showing another fixing member that can be used in the fixing structure of the present invention,
5 and 6 are perspective views showing a conventional fixing structure. In the figure, 2: heat sink, 4: output transistor, 8: latch hole, 9: transistor mounting part, 11: fixing metal part, 12: central bent part, 13: pressing part, 14: strip, 15: receiving part, 16: hook. Department

Claims (1)

[Scope of utility model registration request] 1. A fixing metal fitting (11) formed by bending a spring plate is attached to a heat radiating plate (2) additionally provided with a heating element (4), and the heating element (4) is attached by the elastic force of the fixing metal fitting. In the fixing structure of the heat generating element which is pressed and fixed to the heat sink (2), a retaining hole (8) is provided above the heat generating element mounting portion (9) of the heat sink, and the spring plate is provided at the central portion thereof.
A holding part (13) for pressing the heating element (4) is formed at one end of the fixing metal part (11) bent by (12) and formed in an inverted L shape, and the other bent part is formed in the middle. A strip (14) is left outside to bend to form a receiving portion (15), and a hook (16) that engages with the hook hole is formed at the tip of the strip (14) that remains, Insert the hook part (16) into the hook hole (8) and lock it so that the holding part (1
A heating element fixing structure, characterized in that the heating element (4) is pressed against the heat sink (2) by (3).