JPH069577Y2 - Vehicle rectifier mounting structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rectifier mounting structure in a vehicle such as a motorcycle.

BACKGROUND ART A vehicle rectifier consisting of a rectifier circuit for exchanging AC voltage generated by an AC generator driven by an in-vehicle engine into DC and a voltage adjusting circuit for adjusting the generated voltage to a predetermined voltage is a power loss in circuit components. Therefore, it generates heat.

A mounting structure for a vehicle rectifier that efficiently dissipates this heat and prevents overheating of the rectifier is known, for example, from Japanese Patent Laid-Open No. 60-92179. In the mounting structure for a vehicle rectifier disclosed in the publication, a box-shaped metal case having an open top is formed, and a board carrying circuit components constituting the rectifier is accommodated and fixed at the bottom of the case. Is attached to a vehicle body component such as a frame having good thermal conductivity in a surface contact state, and the heat generated from the rectifier can be efficiently transmitted to the vehicle body component, thereby preventing overheating of the rectifier. .

However, in the above configuration, since the case including the bottom portion is integrally molded by casting or the like, the bottom portion contacting the vehicle body component must be finished to be smooth after the integral molding, which is a problem in productivity. .

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned circumstances, the present invention has an object to provide a vehicle rectifier mounting structure which is excellent in productivity and can more efficiently dissipate heat generated by the rectifier.

In order to achieve the above-mentioned object, in the mounting structure for a vehicle rectifier according to the present invention, a board made of a good thermal conductor carrying circuit components constituting the vehicle rectifier on the main surface is opened at the peripheral portion of the main surface of the board. It is characterized in that the frame member having the tubular wall portions with both ends opening abutting on the end face is pressed against the vehicle body component made of a good heat conductor to bring the main back surface of the substrate into surface contact with the vehicle body member.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a motorcycle will be described with reference to the accompanying drawings.

As shown in FIG. 1, a pedestal 3 for mounting the rectifier assembly 2 is arranged at a relatively well-ventilated position such as below the seat 1 of the motorcycle. The pedestal 3 is formed of a good thermal conductor such as aluminum alloy, and its outer surface is finished to be smooth and welded to the frame 5.

The rectifier assembly has the structure shown in FIG. That is, the circuit components such as the hybrid IC 6, the diode 7, the thyristor 8 and the diode 10, which perform the rectifying function and the voltage adjusting function, are carried on the aluminum insulating substrate 12 which is a good heat conductor on which the copper foil pattern 11 is formed. . The board 12 is formed by punching a flat plate whose front surface and back surface are finished in advance, and the diode 7, the thyristor 8, the diode 10, the A terminal 13 and the B terminal are provided at predetermined positions on the copper foil pattern 11 of the board 12, respectively. 15 is soldered. A frame member 16 is attached to the peripheral portion of the main surface of the substrate 12. The frame member 16 is formed of a highly rigid material such as steel or hard plastic, and
It surrounds the circuit components carried on the substrate 12 perpendicularly to the surface of and has a cylindrical wall portion with open upper and lower ends.

After mounting the frame member 16 on the substrate 12, as shown in FIG. 3 (B), the resin 17 is poured into the inside of the tubular wall portion so that the tips of the terminals of the circuit component are hidden by the resin 17. Each of the terminals 7a, 8 of the diode 7, the thyristor 8 and the diode 10 which are molded so that they do not get stuck, and the hybrid IC 6 is placed on this and projected from the resin 17
Necessary connections such as a, 8b, 10a and the terminals of the hybrid IC 6 or the terminals of the coupler 18 fixed to the frame member 16 are made as shown in FIG. 3 (A), and the resin is further poured on this. Then, the hybrid IC 6 and each terminal are molded so as to be completely embedded.

As shown in the figure, the flange portion 16a of the frame member 16 and the substrate 12 are provided with holes 16b and 12b, respectively, into which the screws 20 for attachment to the vehicle body are inserted. On the other hand, the pedestal 3 attached to the body frame is provided with a screw hole into which the screw 20 is screwed, and the screw 20 is inserted into the holes 16b and 12b of the frame member 16 and the substrate 12 and screwed into the screw hole. By tightly tightening, the board member 12 is pressed against the pedestal 3 by the frame member 16, and at least the back surface of the portion of the board 12 that carries the circuit component is pedestal 3
It is brought into surface contact with.

In this way, the substrate 12 carrying the circuit components that generate heat
By directly making surface contact with the vehicle body member made of a good thermal conductor, the heat generated from each circuit component is quickly transferred to and dissipated to the vehicle body member such as the pedestal 3 and the frame 5 through the substrate 12 made of a good thermal conductor. The heating of is prevented.

In the mounting structure described above, the frame member 16 rigidly presses the substrate 12 against the pedestal 3 that is a vehicle body member, so that the distance between the two holes 12b formed in the substrate 12 is different from that between the screw holes of the pedestal 3. The space between the holes 12b is larger than the space between them or the heat generated by the circuit components causes the substrate 12 to expand and the holes 12b.
Since the mutual distance is increased and becomes larger than the distance between the screw holes, as shown in FIG.
Even when the curved surface is curved and a gap is formed between the base plate 12 and the pedestal 3, as shown in FIG. 4 (B), this can be corrected by pressing with the frame member 16 having high rigidity. Pedestal 3
The surface contact between the substrate 12 and the substrate 12 can be ensured.

Further, since the substrate 12 is formed in a flat plate shape, it has some flexibility in the direction perpendicular to the substrate surface. Therefore, the surface contact between the substrate 12 and the vehicle body member is ensured without finishing the surface of the vehicle body member such as the pedestal 3 with which the substrate 12 comes into contact with a high degree of smoothness, which facilitates the processing on the vehicle body member side.

When the rectifier assembly is attached to the vehicle body, the coupler 18 is used to prevent the coupler 18 from getting wet.
It is preferable to mount it so as to be located on the lower side of 6.

In the embodiment described above, the rectifier is attached to the pedestal welded to the frame below the seat of the motorcycle, but the attachment position is not limited to this position, and the frame having a rectangular cross section without using the pedestal is used. The substrate 12 may be attached by directly contacting the outer surface of the pipe.

Effect of the Invention As described above, in the mounting structure of the vehicle rectifier according to the present invention, the substrate made of a good heat conductor carrying the circuit components constituting the vehicle rectifier on the main surface is provided on the peripheral portion of the main surface of the substrate. Since a frame member having a cylindrical wall portion with both ends opening that abuts on the opening end surface is pressed against a vehicle body constituent member made of a good heat conductor, the main back surface of the substrate is brought into surface contact with the vehicle body member. It does not require the bottom surface of the case to be smoothed after it is integrally molded, as in the mounting structure of, and has excellent productivity. In addition, since the board made of a good thermal conductor that carries the circuit components of the rectifier that self-heats is brought into direct contact with the car body member made of a good thermal conductor, the generated heat can be dissipated efficiently and the rectifier is prevented from heating. it can.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle to which a vehicle rectifier mounting structure according to the present invention is applied, FIG. 2 is a diffusion exploded view of a rectifier assembly, and FIG. 3 (A) is a plan view of the rectifier assembly during assembly. FIG. 3 (B) is BB of FIG. 3 (A).
A cross-sectional view, FIG. 4A is a cross-sectional view when the substrate is attached to the pedestal without using a frame member, and a cross-sectional view when the substrate is pressed against the pedestal using the frame member in FIG. 4B. is there. Description of symbols of main parts 3 ... Pedestal 5 ... Frame 6 ... Hybrid IC 7, 10 ... Diode 8 ... Thyristor 12 ... Substrate 16 ... Frame member

Claims (1)

[Scope of utility model registration request] 1. A substrate having a main surface on which a circuit component constituting a vehicle rectifier for rectifying an on-vehicle generator output to obtain a direct current voltage is formed by a heat conductive insulating material, and a peripheral edge of the main surface of the substrate. A vehicle characterized by pressing the substrate against a vehicle body member by a frame member having both-ends open tubular wall portions that abut on the vehicle body at the opening end face to bring the main back surface of the substrate into surface contact with the vehicle body member. Rectifier mounting structure.