JP3972271B2 - Capacitor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a capacitor device, and more particularly to an improvement of the fixing structure thereof.
[0002]
[Prior art]
A switching module with a built-in semiconductor switching element for power is used with a capacitor connected in parallel at both ends in order to prevent a large surge voltage from being generated at both ends especially when the energization to a large reactance load is cut off. It is common.
[0003]
Conventionally, the switching module and the capacitor are fixed to each other by a band fastening method in which both of them are fastened by a metal band. The fastening method is in practical use.
[0004]
[Problems to be solved by the invention]
However, the above-described band fastening method is not preferable for a high-vibration environment such as an electric vehicle because it is not easy to fasten a metal case of a capacitor with a suitable fixed range of fastening force, and an excessive or insufficient fastening force is likely to occur. It was.
In the method of forming a male screw on the bottom surface of the metal case, it is not easy to form the male screw integrally with the metal case, and it is not easy to fix the male screw to the metal case later. It wasn't.
[0005]
Even in the method of forming the female screw on the bottom surface of the metal case, it is not easy to integrally form the female screw with the metal case, and the fastening operation from the side is not easy in a high-density mounting environment.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a capacitor device that is excellent in assembly reliability despite being easy in structure and fixing.
[0006]
[Means for Solving the Problems]
According to the capacitor device of the first aspect, the capacitor in which the positive and negative terminals are fastened to the pair of connection terminals on the top surface of the metal case has the protrusion protruding outward in the axial direction on the bottom surface thereof. This protrusion fits with the fitting portion of the locking member so that it cannot be displaced in the direction perpendicular to the axial direction but can be displaced toward the axial connection terminal. In this way, a highly reliable capacitor fixing structure can be obtained very easily.
[0007]
This will be described in more detail below.
Since the positive and negative terminals of the capacitor are fastened to the pedestal side at the end of the top surface, displacement of the capacitor in the axial direction is almost prohibited by the pedestal through the connection terminals.
However, the end portion on the bottom surface side of the capacitor has a degree of freedom to rotate by elastic deformation or plastic deformation of the connection terminal using the connection portion between the positive and negative terminals and the connection terminal as a fulcrum. Therefore, this rotation can be regarded as a direction perpendicular to the surface direction of the bottom surface of the metal case, that is, the axial direction of the capacitor.
[0008]
For this reason, in order to fix the capacitor to the pedestal so as not to be relatively displaced, it is only necessary to support the bottom surface of the capacitor so that it cannot be displaced in a direction perpendicular to the axial direction, and it is not necessary to regulate the displacement of the capacitor in the axial direction. In a normal support state, the connection terminal is elastically or plastically deformed to displace the connection portion between the connection terminal and the positive and negative terminals in the axial direction so that the fitting between the projection and the fitting portion is released. It is assumed that an external force does not act on the connection terminal.
[0009]
In this way, only the displacement in the direction perpendicular to the axial direction of the bottom surface of the capacitor is regulated by utilizing the fact that the top surface side of the capacitor is fixed to the pedestal using the electrical connection between the capacitor and the pedestal. By doing so, the structure of the fixing mechanism and the remarkably simplified operation can be realized without impairing the fixing reliability as compared with the conventional capacitor fixing method described above.
[0010]
According to the configuration of claim 2, wherein further in the condenser apparatus according to claim 1, wherein the connecting terminal is fastened by screws to the upper surface extending in the axial direction of the pedestal. In this way, after the connection terminal is fastened to the positive and negative terminals of the capacitor, the protrusion is fitted into the fitting portion of the locking member, and then the connection terminal is fastened to the base, so that any member is obtained. Without forcibly elastically deforming the capacitor, it is possible to perform the assembly work of the capacitor and improve workability.
[0011]
According to the configuration described in claim 3, in the capacitor device according to claim 1 or 2, the locking member elastically biases the metal case toward the connection terminal, so that the connection terminal is elastically deformed (axial direction) in a high vibration environment. Even if the above occurs, it is possible to satisfactorily prevent the protrusion of the capacitor from coming off the fitting portion of the locking member.
According to the fourth aspect of the present invention, in the capacitor device according to any one of the first to third aspects, the protrusion is formed integrally with the metal case made of an aluminum thin plate. The metal case can be formed by drawing or the like, and the protrusion manufacturing process can be greatly simplified.
[0012]
According to the fifth aspect of the present invention, in the capacitor device according to any one of the first to fourth aspects, the protrusion and the fitting portion have a side surface shape that cannot be relatively rotated. This makes it easy to position the capacitor in a plane perpendicular to the axial direction when attaching the capacitor, and after fixing, the capacitor rotates in a plane perpendicular to the axial direction. Even if an external force is applied, the rotation can be prevented.
[0013]
According to the configuration of the sixth aspect, in the capacitor device according to any one of the first to fifth aspects, the capacitor is provided in close contact with the upper surface of the pedestal comprising the switching module.
In this way, it is possible to further prevent relative displacement of the capacitor pedestal due to external force, and heat generated from the semiconductor switching element in the switching module, which requires heat dissipation, is radiated well through the metal case of the capacitor. In addition, electromagnetic noise generated by turning on and off the semiconductor switching element can be well suppressed by the metal case of the capacitor.
[0014]
According to the seventh aspect of the present invention, in the capacitor device according to any one of the first to sixth aspects, the protrusion is provided so as to be offset from the center of the bottom surface of the metal case toward the pedestal side. The height of the stop member can be reduced to reduce the size and weight.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the capacitor device of the present invention will be described with reference to the following examples.
[0016]
[Example 1]
An embodiment of the capacitor device of the present invention will be described below with reference to FIGS. 1, 2, and 6. FIG. FIG. 1 is a side view of the capacitor device, FIG. 2 is a perspective view of a capacitor used in the capacitor device, and FIG. 6 is a circuit diagram of the capacitor device.
In this capacitor device, a capacitor C is fixed above the switching module 2. The switching module 2 has a resin wall portion around the metal base plate, accommodates a power transistor T and a diode D connected in reverse parallel thereto, and is sealed with a lid made of metal or resin. The switching module 2 is fixed to the surface of a metal heat sink (not shown).
[0017]
The capacitor C is formed by housing an electrode-dielectric winding assembly (not shown) in a metal case 1 having a can shape with one end opening, and then covering the opening of the metal case 1 with a lid. It is an electrolytic capacitor, and the protrusion 3 is formed by drawing or punching in the axial direction from the bottom surface.
Reference numeral 4 denotes a resin locking member fixed to the upper surface of the switching module 2, which is integrally formed with the resin lid portion of the switching module 2 in this embodiment.
[0018]
Reference numeral 5 denotes a concave portion (a fitting portion referred to in the present invention) that is recessed in the locking member 4 in the axial direction, and the protrusion 3 is inserted into the concave portion 5 in the axial direction, and the axial direction of the bottom portion of the capacitor C is Displacement in a perpendicular direction is prevented.
Reference numerals 7 and 8 denote positive and negative terminals of the capacitor C, which are formed by resin-sealing these small holes in a state protruding from the pair of small holes provided in the lid of the capacitor C in the axial direction.
[0019]
Reference numerals 9 and 10 are connection terminals made of L-shaped copper bars, 11 is a resin film for insulating and separating the connection terminals 9 and 10 stacked on each other, and 12 is a switch for the connection terminals 9 and 10 individually. A pair of screws (only one in the foreground is shown) fastened to terminals (not shown) on the upper surface of the module 2, 13 and 14 are a pair of screws for fastening the connection terminals 9 and 10 individually to the positive and negative terminals 7 and 8. It is a screw.
[0020]
Next, the assembly of this capacitor device will be described below.
First, after the connection terminals 9 and 10 are fastened to the positive and negative terminals 7 and 8 of the capacitor C, the protrusion 3 is fitted into the recess 5. Note that this order may be reversed. Next, the connection terminals 9 and 10 are fastened to the terminals of the switching module 2.
In this way, the capacitor C can be fixed to the switching module 2 without any special structure or parts, and the fixed capacitor C does not come off the switching module 2 even in a high vibration environment.
[0021]
In addition, the outer diameter of the protrusion 3 and the inner diameter of the recess 5 are formed to be substantially equal so that there is no rattling.
[0022]
[Example 2]
Another embodiment of the capacitor device of the present invention will be described with reference to FIG.
In this embodiment, the resin locking member 4 is replaced with an L-shaped locking member 15 made of a metal plate in the capacitor device of the first embodiment shown in FIG.
The base end portion of the locking member 15 is fixed to a metal lid portion on the upper surface of the switching module 2 by a method such as welding, and the protrusion 3 of the capacitor C is inserted into a small hole provided at the distal end portion of the locking member 15. Is inserted. In addition, the outer diameter of the protrusion 3 and the inner diameter of the small hole of the locking member 15 are formed to be substantially equal so that there is no rattling.
[0023]
If it does in this way, while having the same effect as Example 1, it can simplify the resin molding process.
In addition, the front-end | tip part of the latching member 15 is formed so that elastic deformation is possible to an axial direction, and the connecting terminals 9 and 10 can be fastened to the terminal of the switching module 2 with a screw, pushing the latching member 15 into an axial direction. . In this way, the fixing of the capacitor C can be further improved.
[0024]
[Example 3]
Another embodiment of the capacitor device of the present invention will be described with reference to FIG. However, the same code | symbol is attached | subjected to the component which has a main function in common.
This embodiment is an expansion of the outer diameter of the projection 3 and the inner diameter of the small hole of the locking member 15 in the capacitor device of the second embodiment shown in FIG. It is tapered toward the tip. In this way, the protrusion 3 can be pressed into the small hole of the locking member 15 to make it difficult to separate them, so that the capacitor C can be fixed more satisfactorily.
[0025]
[Example 4]
Another embodiment of the capacitor device of the present invention will be described with reference to FIG. However, the same code | symbol is attached | subjected to the component which has a main function in common.
In this embodiment, in the capacitor device of the third embodiment shown in FIG. 4, the base portion of the L-shaped locking member 15 extends directly below the capacitor C, and the base portion of the locking member 15 is the switching module 2. And the lower surface of the capacitor C are in close contact with each other.
[0026]
If it does in this way, the heat of switching module 2 can be dissipated by heat transfer to metal case 1 of capacitor C through the base of locking member 15 , and the cooling nature of switching module 2 improves. Furthermore, since the metal case 1 of the capacitor C is closer to the upper surface of the switching module 2 than in the other embodiments, the emission of electromagnetic waves from the upper surface of the switching module 2 and external electromagnetic waves affect the semiconductor switching elements in the switching module 2. Can be suppressed more satisfactorily.
[0027]
In FIG. 5, the metal case 1 of the capacitor C can be directly fixed to the upper surface of the switching module 2.
[0028]
[Modification]
The deformation mode will be described below.
In each of the embodiments so far, the projection 3 has a columnar shape or a truncated cone shape, but the cross section in a direction perpendicular to the axial direction has an arbitrary shape such as an oblong shape, an elliptical shape, a square shape, or a triangular shape. Can do.
[0029]
By adopting such a non-cylindrical shape, it is possible to position the posture of the capacitor C on the rotation surface simply by fitting the protrusion 3 into the recess 5 or the small hole, and the subsequent screw fastening operation is facilitated.
Furthermore, it is of course possible to provide a plurality of protrusions 3.
[Brief description of the drawings]
FIG. 1 is a side view of a capacitor device according to a first embodiment.
FIG. 2 is a perspective view of a capacitor used in the capacitor device.
FIG. 3 is a side view of the capacitor device according to the second embodiment.
4 is a side view of the capacitor device according to Embodiment 3. FIG.
FIG. 5 is a side view of the capacitor device according to the fourth embodiment.
FIG. 6 is a circuit diagram of the capacitor device of each example.
[Explanation of symbols]
C is a capacitor, 1 is a metal case of the capacitor C, 2 is a switching module (pedestal), 3 is a protrusion, 4 is a locking member, 5 is a recess (fitting portion), 9 and 10 are connection terminals, and 15 is a lock Element

Claims (7)

Capacitors in which positive and negative terminals protrude from the top surface of the metal case at predetermined intervals in an axial direction perpendicular to the top surface;
A capacitor support base extending in the axial direction in parallel with the capacitor;
A pair of connection terminals that are projected from the pedestal toward the top surface of the metal case and are fastened to the positive and negative terminals by screws so as not to be axially displaceable;
In a capacitor device comprising:
A protrusion provided on the bottom surface of the metal case and protruding outward in the axial direction;
The bottom surface of the metal case from the pedestal has a fitting portion that engages with the protrusion so that the protrusion cannot be displaced in a direction perpendicular to the axial direction and can be displaced toward the axial connection terminal side. A locking member protruding to the vicinity;
A capacitor device comprising: The capacitor device according to claim 1,
The connection terminal is a screw, the capacitor device comprising a benzalkonium fastened to the upper surface of the capacitor side of said base in the axial direction and perpendicular. The capacitor device according to claim 1 or 2,
The said locking member elastically urges | biases the said metal case to the said connection terminal side, The capacitor | condenser apparatus characterized by the above-mentioned. The capacitor device according to any one of claims 1 to 3,
The capacitor device, wherein the protrusion is formed integrally with the metal case made of an aluminum thin plate. The capacitor | condenser apparatus in any one of Claim 1 thru | or 4 WHEREIN:
The capacitor device according to claim 1, wherein the protrusion and the fitting portion have side shapes that are not relatively rotatable. The capacitor device according to any one of claims 1 to 5,
The capacitor device is provided in close contact with an upper surface of the pedestal made of a switching module. The capacitor device according to any one of claims 1 to 6,
The capacitor device according to claim 1, wherein the protrusion is provided to be deviated from the center of the bottom surface of the metal case toward the pedestal.

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