JPS6023959Y2 - small variable capacitor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a small variable capacitor, and provides a small variable capacitor that can improve performance by ensuring that a stator support and a stator plate or washer fitted thereto are electrically connected to each other through a simple structure. The purpose is to

Generally, a small variable capacitor has the configuration shown in FIG.

In the figure, a resin substrate 2 of a small variable capacitor 1 has four cylindrical portions 2a (only one pair shown) integrally formed, for example, at the four corners of the upper surface.

Reference numeral 3 denotes a negative rotor shaft, which is inserted through and supported in the center of the base plate 2, and rotor plate groups 4a and 4b (each consisting of a plurality of rotor plates 4), which are two sets of electrode plate groups, are mounted and fixed, for example.

5 is four metal stator struts (only two are shown)
, are inserted and fixed into each cylindrical portion 2a of the substrate 2 in a vertically protruding manner, and their lower ends serve as terminal portions 5a.

Further, stator plate walls 6aw6b (each consisting of a plurality of stator plates 6) as a group of electrode plates are fitted to each pair of stator supports 5, and each plate wall 4a and 6a, 4b and 6b
Thus, variable capacitor parts 7a and 7b are formed, respectively.

In order to configure each stator plate wall 6a, 6b, after the stator plate 6 is commonly fitted to a pair of stator columns 5 through its pair of fitting holes, a metal washer is fitted to each stator column 5, respectively. 8 may be sequentially repeated to stack and assemble.

Reference numeral 9 denotes a resin push body, and four cylindrical parts 9a integrally formed therein are inserted and attached to the upper part of the stator support 5, respectively, and are positioned by nuts 10 screwed onto the upper end of each stator support 5, and at the same time, the rotor 3 Support the upper end.

During this operation, if the rotor shaft 3 is rotated appropriately, the variable capacitor section? A stator column 5 whose capacitance is appropriately varied at a and 7b, and which connects the rotor shaft 3 to the ground potential and is electrically connected to the stator plate 6 directly and indirectly via a washer 8.
A desired capacitance is variably taken out by setting the terminal portion 5a of the terminal portion 5a to a variable potential.

However, according to the above configuration, the outer diameter of the stator support column 5 is configured to contact and conduct only with the inner diameter of the fitting hole where the stator plate 6 and washer 8 are laminated, so the fitting may become loose due to product errors and eccentricity may occur. This has the disadvantage that it is easy to cause poor contact and the performance is likely to deteriorate.

In another conventional example, the diameters of the fitting holes of the stator plate 6 and washer 8 are made smaller in order to prevent the above-mentioned poor contact.
Some systems have tried to ensure electrical conduction by press-fitting the stator support 5 into the fitting hole, but since the stator plate 6 is originally thin, it is likely to be distorted and bent during the press-fitting process, resulting in poor capacitance characteristics. This has the disadvantage that torque characteristics deteriorate and performance tends to deteriorate.

As another conventional example, as shown in FIG. In addition, a pair of fitting holes at both ends 12a and 12b of the conductive lug 12 made of a U-shaped thin metal plate are fitted into the lower surface of the substrate 2 and the upper surface of the cylindrical portion 2a of the stator support 11, respectively. When the assembly is completed, both ends 12a and 12b are pressed into surface contact with the flange 11a of the column 11 and the stator plate 6, respectively, to ensure reliable conduction.

However, this method has disadvantages in that the number of required parts of the conductive lug 12 increases, and the assembling process is troublesome, making automatic assembly difficult and increasing costs.

The present invention eliminates the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings.

Figures 3 to 5 are partial vertical cross-sectional views sequentially showing the assembly process of the main parts of one embodiment of the small variable capacitor according to the present invention, and Figures 6A and 6B show the tongues of the washer used in the above capacitor, respectively. They are a plan view before cutting and raising the tongue, and a side view after cutting and raising the tongue, and in each figure, the same parts as in FIGS.

In FIG. 3, the upper portion of the flange portion 11a of the stator support column 11 has a perfect circular shape with an outer diameter d.

13 is a washer made of a thin metal spring plate made of phosphor bronze, nickel silver, etc., and as shown in FIG. 13a, and a width 1□ (1□<d<1□) smaller than the above outer diameter d in the direction perpendicular to the parallel cut 13a.
A pair of parallel cuts 13b are cut and the central portion is removed, and a pair of tongues 13c formed on both sides are further formed upward at a predetermined angle as shown in FIG. 14 is formed.

At this time, the spacing 13 of the pair of tongues 13c has the width 1□,
Furthermore, it becomes larger than the outer diameter d (13>d>1°).

Therefore, when attaching the washer 13 to the support column 11 as shown in FIG.
3 are both larger than the outer diameter d, so they are easily loosely fitted and placed on the upper surface of the cylindrical portion 2a.

Next, as shown in FIG.
and ordinary washers 8 are fitted alternately in the same manner as in the conventional example, and further the cylindrical portion 9a of the push plate 9 is assembled.

Finally, when the nut 10 is screwed onto the upper end of the support column 11 and tightened as shown in FIG. 5, the above-mentioned parts 13.8.6 are pressed against each other between the cylindrical portions 2a and 9a and are electrically connected to each other.

However, at this time, the l pair of tongues 13c of the washer 13 are elastically deformed downward in FIG. 6B, and the original width 1 between the tongues 1c is
Since □ is smaller than the outer diameter d of the strut 11, each tongue portion 13
The tip of c is pressed against the outer diameter of the support column 11, and both 13 and 11 are reliably electrically connected.

Further, in this case, the lowermost stay plate 6 in FIG. 5 is electrically connected to at least the pair of tongue portions 13c slightly raised from the main body surface of the washer 13 in a surface contact manner.

In this way, the stator plate 6 is reliably electrically connected to the stator column 11 via the washer 13.

Further, the above-mentioned assembly work is no different from that of the conventional fitting type shown in FIG. 1, and the work is easy and the assembly can be automated, there is no risk of distortion in the stator plate 6, and the number of parts is small.

The fitting hole 14 of the washer 13 in the above embodiment has a pair of tongue portions 1.
3c, but in some cases - as shown in Figure 8.
The fitting hole 15 may have only the tongue portion 13c,
Alternatively, it may have three or more tongues.

In short, it is sufficient that at least the minus tongue portion 13c is cut and raised to be elastically deformable by a predetermined angle or bent by pressing or the like, and various types of fitting holes may be employed.

Further, in the above embodiment, the tongue portion 13c is provided on the lowermost washer 13 of the stator plate wall a, but the tongue portion 13c is not limited to this, and as shown in FIG. Hole 1
Each of the stator plates 6 may have one or a pair of tongue portions as described above, whereby the stator plate 6 is directly and reliably electrically connected to the support column 11.

Further, the washer having the tongue portion may be fitted not only to the stator support but also to the rotor shaft to ensure reliable electrical conduction between the rotor plate and the rotor shaft.

As described above, according to the small variable capacitor of the present invention, at least one of the electrode plate and the metal washer is attached to the metal support in a stacked manner so as to be electrically connected to the support. The hole for the mounting base is formed by bending at least one of the opposing edges in one direction of the predetermined hole whose inner diameter in at least one direction is slightly smaller than the outer diameter of the support column so as to be resolvable and deformable at a predetermined angle. The fitting hole has an inner diameter larger than the support column in plan view due to the bending of the edge, and the one member can be easily loosely fitted to the support column. When a nut, etc. is attached and crimped together with other plates and washers, the bent portion is elastically deformed and pressed against the outside diameter of the support, so the plates are securely attached either directly or indirectly through washers. It is electrically conductive with the pillar, and good electrical characteristics can be obtained.In addition, the number of parts is small, and the bending part itself is easy to process.Furthermore, the loose fitting makes assembly work easy. It has the advantage of being able to automate and reduce man-hours.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partially cut away longitudinal cross-sectional views of a conventional example of a small variable capacitor, and partial vertical cross-sectional views of main parts of other conventional examples, and FIGS. Vertical cross-sectional partial views sequentially showing the assembly process of the main parts of one embodiment of the variable capacitor,
6A and 6B are respectively a plan view of the washer used in the capacitor before the tongue is cut out and a side view after the tongue is cut out, FIG. 7 is a perspective view of the washer, and FIG. 8 is a side view of the washer used in the capacitor. FIG. 9 is a perspective view of another embodiment of the washer, and FIG. 9 is a perspective view of a stator plate having the tongue portion. 1... Small variable capacitor, 2... Board, 3... Field-Yu axis, 4... Rotor plate,
4a... curved rotor plate group, 5. 11... Stator support column, 5a, llb... Terminal part, 6... Stator plate, 6a... Stator plate material, 7a, 7b
... Variable capacitor part, 8.13 ... Washer, 9 ... Push plate, 10 ... Nut, 1
1a... Flange, 12... Continuity lug, 1
2a, 12b... Both ends of the lug, 13a, 13b
...... cut, 13c... tongue, 14 ~
16...Fitting hole.

Claims (1)

[Scope of utility model registration request] The above-mentioned fitting hole of at least one member of the electrode plate and the metal washer, which are sequentially fitted into the metal support in a stacked manner and connected to the support, has an inner diameter in at least one direction that is outside the support. A small variable capacitor having a structure in which at least one of the unidirectionally opposing edges of the predetermined hole, which is slightly inside the diameter, is bent so as to be deformable at a predetermined angle.