JPH03214572A - Lug terminal fitting method for heat sink - Google Patents

Abstract

PURPOSE:To have sure electric continuity by forming a recess at one side of a heat sink and a protrusion on the other side, forming a projection on the inner surface of one member of the U-shaped part of a lug terminal, fitting the heat sink in the U-shaped part, and shearing off the protrusion on the heat sink with that member of U-shaped part as mentioned. CONSTITUTION:A projection 10a formed on the inside of one member of the U-shaped part 10c of a lug terminal 10 and a recess 12a formed in a heat sink 12 are faced in the direction of fitting each other, and the lug terminal 10 is mounted in the heat sink 12. As the other member of the U-shaped part 10c collides on the way with a protrusion 12b on the heat sink 12, however, the mounting force is further energized, and the other member of the U-shaped part 10c of the lug terminal 10 shears this protrusion 12b off, and insertion is continued until the recess 12a and the projection 10a on the lug terminal 10 are fitted each other. Therein the lug terminal 10 having sheared the protrusion 12b off is connected electrically at the shearing part, and an insert piece 10d to be inserted in a base board 11 is connected with a base board circuit with solder 13. Thus certain electric continuity is obtained.

Description

[Detailed description of the invention] ? INDUSTRIAL APPLICATION FIELD The present invention relates to a method for attaching lug terminals to a heat sink used in electrical equipment.

(Prior art) Generally, heat sinks used as heat sinks for circuit boards of electrical equipment are subjected to alumite treatment, caustic treatment, and electrodeposition coating, and are covered with an insulating surface treatment coating. Several conductive connection methods are used to electrically connect the circuit board and the circuit board.

A common example will be explained below.

FIG. 4 is an exploded sectional view for explaining a conventional method of attaching lug terminals to a heat sink.

In the figure, 1 is a heat sink, and a cylindrical half punch 1a is provided at a position where electrical connection of the heat sink 1 is desired.
is molded, and its surface is entirely covered with an insulating surface treatment film 2. Reference numeral 3 denotes a lug terminal made of a conductor, and as shown in the perspective view of FIG. This is a cross-sectional view of the terminal 3 being caulked and crimped.To perform the crimp process, first insert the hole 3 of the lug terminal 3 into the cylindrical half bunch 1a of the heat sink 1 shown in FIG.
a are fitted, and the cylindrical half punch 1a of the heat sink 1 is caulked and crimped using a caulking device (not shown).

During crimping, part of the insulating surface treatment film 2 is destroyed due to sliding contact between the cylindrical half bunch 1a of the heat sink 1 and the hole 3a of the lug terminal 3, so electrical continuity can be achieved. .

Another method is to provide a hole at a desired position in the heat sink 1 and tighten the lug lattice 3 using a tapping screw to create a conductive connection.

(Problems to be Solved by the Invention) As described above, the surface buried coating 2 of the insulation 1 interposed between the heat sink 1 and the lug terminals 3 is destroyed by the crimping, and the contact between the heat sink 1 and the lug terminals 3 is broken. The method of making a continuity connection is uncertain and lacks reliability as complete continuity cannot be obtained, and continuity without tightening the lug terminal 3 using a Tazo pin screw increases the number of parts and costs. ,
There was a problem with man-hours.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes a heat sink made of a metal conductor whose surface is insulated by a surface treatment film, and electrical connection of the heat sink to a circuit board. A method for attaching a lug terminal to a lug terminal includes the steps of: forming a recess on one side of the heat sink and forming a protrusion on the other side; forming a U-shaped portion on the lug lattice; forming a convex part on the inner surface of one piece of the heat sink, by inserting the heat sink into the U-shaped part, the convex part of the heat sink is sheared by one piece of the U-shaped part; The object of the present invention is to provide a method for attaching a lug terminal to a sink, which is characterized by the step of fitting the protrusion of the lug terminal.

(Example) FIG. 1 is a perspective view of essential parts of a rug paper 10 and a heat sink 12 of the present invention. In the same figure, the heat sink 12 has a protrusion 12b on one side and a recess 12a (not shown) on the other side corresponding to the protrusion 12b, and the inserted lug terminal 10 is fitted into the position where the lug terminal 10 is desired to be attached to the heat sink 12. A matching notch 12c is provided. The lug terminal 10 includes an insertion piece 10d that is inserted into the board 11 and a U that supports the heat sink 12.
A U-shaped portion 10c is formed, and a convex portion 10a that fits into the concave portion 12a of the heat sink 12 is provided inside one piece of the U-shaped portion 10C. Also, the heat sink 12
In order to facilitate insertion and attachment, the tip 10b is bent outward.

FIGS. 2A, 2B, and 2C are cross-sectional views for explaining how the lug terminal 10 is inserted into the heat sink 12. FIG. In FIG. 2(A), the lug terminal 10 is inserted into the heat sink 12 so that the convex portion 10a provided on the inside of one piece of the U-shaped portion 10c of the lug terminal 10 and the recess 12a of the heat sink 12 fit together. However, on the way, the lug of the U-shaped portion 10c of the lug terminal 10 hits the convex portion 12b of the heat sink 12. By further applying the insertion force, as shown in Fig. 2 (
As shown in B), the other piece of the U-shaped portion 10c of the lug terminal 10 shears the convex portion 12b of the heat sink 12, and the concave portion 12a of the heat sink 12 and the convex portion 10a of the lug terminal 10 are separated.
can be inserted until they are mated.

FIG. 2(C) shows a state in which the heat sink 12 is supported by the U-shaped portion 10c of the lug terminal 10.
The lug terminal 10 obtained by shearing the convex portion 12b is electrically connected at the sheared portion, and the insertion piece 10d inserted into the board 11 can be connected to the board circuit with solder 13.

FIG. 3 is a perspective view of the heat sink 12 mounted on the substrate 11 using the lug terminals 10 according to the method of the present invention described above.

(Effects of the Invention) As described above, in the method of attaching a heat sink made of a metal conductor and insulated by a surface treatment film, and a lug for sliding the heat sink to a circuit board. , forming a recess on one side of the heat sink and forming a protrusion on the other side; forming a U-shaped part on the lug terminal and forming a protrusion on the inner surface of one piece of the U-shaped part; a step of inserting the heat sink into the U-shaped portion, shearing the convex portion of the heat sink with one piece of the U-shaped portion, and fitting the concave portion of the heat sink with the convex portion of the lug terminal; This method of attaching lug terminals to heat sinks is characterized by the following: it is possible to reliably break the insulating film of the heat sink covered with an insulating film, and it is the simplest and cheapest way to obtain reliable continuity. I can also provide you with a method of attaching lug terminals to a heatsink.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of the lug terminal and heat sink of the present invention, Figures 2 (A), (B), and (C) are sectional views for explaining the insertion of the lug terminal into the heat sink; Fig. 3 is a perspective view of a heat sink attached to a board using lug terminals according to the method of the present invention, Fig. 4 is an exploded cross-sectional view for explaining the conventional method of attaching lug terminals to a sink. Fig. 5 6 is a perspective view of a conventional lug terminal, and FIG. 6 is a sectional view of the lug terminal crimped and pressed onto a conventional heat sink. 10...Lug terminal, 10a... Convex portion,
10b...Bent part, 10c...U-shaped part, 1
0d...insertion piece, 11...circuit board, 12...heat sink, 12a...recessed part,
12b...Convex part, 12c...Notch part, 1
3...Solder.

Claims (1)

[Claims] A method for attaching a heat sink made of a metal conductor and whose surface is insulated by a surface treatment film, and a lug terminal for electrically connecting the heat sink to a circuit board, comprising: a recess on one surface of the heat sink. forming a U-shaped part on the lug terminal and forming a protruding part on the inner surface of one piece of the U-shaped part; The heat sink is sheared by one piece of the U-shaped part by inserting it into the heat sink, and the lug terminal is fitted into the concave part of the heat sink with the convex part of the lug terminal. How to install lug terminals on a heatsink.