JPH027027Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a centering jig for centering two parts fitted together at a required interval.

[Conventional technology]

In general, a cone speaker has an annular upper plate 12 attached to the lower end of a cone-shaped frame 11, and a ring-shaped magnet 14 is formed between the upper plate 12 and the lower plate 13 disposed below the cone-shaped frame 11, as shown in FIG. Clamp the above lower plate 1
The lower part of the voice coil bobbin 16 is fitted concentrically to the outside of the center pole 15 provided at the center of the upper surface of the frame 3, and the ends of the cone 17 and damper 18 arranged inside the frame 11 are glued to the voice coil bobbin 16. It has been done.

In such a cone speaker, in order to improve the speaker characteristics, the upper plate 12 is
It is necessary to make the annular gap formed by the center pole 15 uniform over the entire circumferential direction.
For this purpose, it is necessary to center the upper plate 12 and the center pole 15 and fix them so that the axes of both parts coincide. For centering, a centering jig is usually used.

The conventional centering jig has a cylindrical jig main body, the outer diameter of which is approximately equal to the inner diameter of the upper plate 12, and the inner diameter of which is approximately equal to the outer diameter of the center pole 15, so that the upper plate 12 and the center pole are connected to each other. The main body of the jig is inserted between 15 and 15.

[Problem that the invention attempts to solve]

By the way, since the upper plate 12 is a punched product, it has a required punching tolerance and has variations in inner diameter dimension.

Therefore, in a centering jig with a constant outer diameter dimension of the jig body, when centering the upper plate 12 with a large punching tolerance, there is a gap between the upper plate 12 and the jig body inserted inside it. This may cause the problem that the upper plate 12 cannot be accurately centered.

Therefore, this invention aims to eliminate the above-mentioned inconveniences and provide a centering jig that can accurately center inner parts such as a center pole and outer parts such as an upper plate. The purpose is

[Means for solving problems]

In order to achieve the above object, this invention includes a cylindrical part that can be inserted between an inner part and an outer part fitted on the outside thereof, and divides the cylindrical part in the circumferential direction into a plurality of divided pieces. The inner diameter of one of the adjacent split pieces is set to be a diameter that can contact the outer diameter surface of the inner part, the outer diameter is made smaller than the inner diameter of the outer part, and the inner diameter of the other split piece is set to be a diameter that can contact the outer diameter surface of the inner part. The outer diameter is made larger than the outer diameter so that the outer diameter can come into contact with the inner diameter surface of the outer part.

[Effect]

When centering the inner diameter part and the outer diameter part, a cylindrical part is inserted between the two parts. In its inserted state,
Among the adjacent divided pieces, the inner diameter surface of one of the divided pieces, which has a smaller outer diameter and inner diameter, contacts the inner diameter surface of the inner part, and the outer diameter surface of the other divided piece contacts the inner diameter surface of the outer part. Since a plurality of divided pieces are provided, the inner diameter surface of the inner component and the outer diameter surface of the outer component are supported at several locations in the circumferential direction. As a result, the inner part and the outer part are supported concentrically.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings.

As shown in the figure, the jig main body 1 includes a knob, and a cylindrical portion 3 is formed below the knob 2. Cylinder part 3
Slits 4 in the axial direction are formed at equal intervals, and a plurality of divided pieces 5 are provided in the circumferential direction of the cylindrical portion 3 due to the formation of the slits 4.

Among the adjacent divided pieces 5, one of the divided pieces 5 has an inner diameter that can come into contact with the outer diameter surface of the inner part to be centered, and the outer diameter is set to a diameter that allows contact with the outer diameter surface of the inner part to be centered. (hereinafter, this divided piece will be referred to as the outer diameter centering divided piece 5a). In addition, the inner diameter of the other divided piece 5 is larger than the outer diameter of the inner part, and the outer diameter is set to a diameter that can contact the inner diameter surface of the outer part. (referred to as piece 5b).

In addition, in the illustrated embodiment, the outer diameter centering dividing piece 5
Although three divided pieces a and three inner diameter centering divided pieces 5b are shown, it is sufficient to have at least two or more.

The centering jig shown in the embodiment has the above structure, and when using this jig to center the center pole 15 and upper plate 12 of the speaker shown in FIG. 4, for example, the centering jig shown in FIG. As shown, the cylindrical portion 3 is inserted between the center pole 15 and the upper plate 12. By inserting the cylindrical portion 3, the inner diameter surface of the outer diameter centering split piece 5a is adjusted to the center pole 15.
on the other hand, the inner diameter centering split piece 5
The outer diameter surface of b contacts the inner diameter surface of the upper plate 12, and since each of the divided pieces 5a and 5b is plural, several places on the outer diameter surface of the center pole 15 are in contact with the outer diameter centering divided piece 5a. At the same time, several locations on the inner diameter surface of the upper plate 12 are supported by the inner diameter centering division pieces 5b. As a result, the center pole 15 and the upper plate 12 are supported concentrically.

Since each of the outer diameter centering segment 5a and the inner diameter centering segment 5b has elasticity in the radial direction, the center pole 15 and the upper plate 12
Even if there is a dimensional change in the outer diameter and inner diameter between the same parts, each divided piece deforms in response to the dimensional change, making it possible to reliably center each part with high precision. .

In order to facilitate insertion of the cylindrical portion 3, it is preferable to provide a tapered surface at the tip of the inner diameter surface of the outer diameter centering segment 5a and the outer diameter surface tip of the inner diameter centering segment 5b. .

〔effect〕

As described above, in this invention, a tube made of a plurality of divided pieces is inserted between an inner part such as a center pole and an outer part such as an upper plate that fits on the outside thereof. , both parts can be centered, and the inner diameter surface of one of the adjacent split pieces contacts the outer diameter surface of the inner part, and the outer diameter surface of the other split piece contacts the inner diameter of the outer part. Since the structure has a plurality of divided pieces in the circumferential direction with their surfaces in contact, the outer diameter surface of the inner part and the inner diameter surface of the outer part are supported at several points in the circumferential direction. Centering can be performed with high precision.

In addition, since each of the divided pieces has elasticity in the radial direction, even if there is a dimensional tolerance between the inner parts and the outer parts, each divided piece has a diameter that corresponds to the dimensions of the inner and outer parts. deform in the direction. Therefore, even parts with dimensional tolerances can be centered with high precision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the centering jig according to this invention, FIG. 2 is a bottom view of the same, and FIG.
The figure is a partially cutaway cross-sectional view showing the state of use of the same as above.
The figure is a sectional view showing a cone speaker. 3...Cylinder part, 5...Divided piece.

Claims (1)

[Scope of utility model registration request] A centering jig for concentrically aligning an inner part and an outer part fitted to the outside thereof at a required interval, the centering jig comprising a cylindrical part that can be inserted between the inner part and the outer part. , the cylindrical portion is divided in the circumferential direction to form a plurality of divided pieces, the inner diameter of one of the adjacent divided pieces is set to be a diameter that can contact the outer diameter surface of the inner part, and the outer diameter is set to be the diameter of the outer diameter of the outer part. A centering jig characterized in that the diameter of the other divided piece is smaller than the inner diameter, the inner diameter of the other divided piece is larger than the outer diameter of the inner diameter part, and the outer diameter is such that it can come into contact with the inner diameter surface of the outer part.