JPS5814692Y2 - Separate field magnet fixing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixing device that utilizes the elasticity or flexibility of an integrally molded synthetic resin to easily incorporate and fix a split field magnet.

Conventionally, the C-shaped magnet was fixed inside the cylinder by sliding it in contact with the wall and interposing a U-shaped spring material between the magnets, but it was not possible to fix it in the axial direction. Therefore, it is necessary to prepare a separate part for the stopper in addition to the spring material, which adds extra components and causes a magnetic short circuit through the spring material, reducing the effective magnetic flux or restricting the spring material from fixing it in the axial direction. The drawback was that it was not possible.

The present invention has been devised in view of these points, and its contents will be explained below using illustrated examples.

1 is an elliptical ring made of synthetic resin, and a pair of rigid stopper protrusions 2 are provided in the direction of its short axis, and its width t is as follows:
When the C-shaped magnets 3 and 4 are appropriately arranged in the case body 5, the width is set to be an intermediate width between the outer interval t1 and the inner interval t2.

That is, tl>t>t2.

Reference numeral 6 denotes a pair of positioning protrusions provided in the longitudinal direction of the oval ring 1, which are designed to fit into a notch 7 formed in the case body 5, and prevent rotation in the circumferential direction.

Next, the assembly sequence of the device of the present invention having a diagonal configuration will be explained.

First, the C-shaped magnets 3 and 4 are appropriately arranged inside the case body 5.

Thereafter, the long axis side of the elliptical ring 1, specifically the positioning protrusion 6, is pressurized and deformed in the directions of arrows A and B to form a substantially annular shape, and the stopper protrusion 2 is inserted into the outer interval t1 of the C-shaped magnet 3.4. After inserting it near the area, release the pressure.

Then, the elliptical ring 1, which had been pressurized and deformed into a substantially annular shape, acts to return to its original shape due to its restoring elasticity, and because the width t of the stopper protrusion 2 is larger than the inner interval t2, the elliptical ring 1 hits the C-shaped magnets 3, 4. It will be in a brim shape and will be fixed inside the case body 5.

At this time, the positioning protrusion 6 is fitted into the notch 7 of the case body 5.

(Fig. 5) The embodiment shown in Figs. 8 to 10 is another embodiment, and is characterized in that a protrusion fitting hole 8 is bored in the case body 5, and the positioning protrusion 6 of the oval ring 1 is inserted into the case body 5. By doing so, the connection between the elliptical ring 1 and the case body 5 is made more secure, and it is improved so that it will not come off against the force acting in the axial direction.

Therefore, in the present invention, the stopper protrusion 2 as a rigid body provided in the short axis direction of the elliptical ring is inserted into the gap that spreads radially between the C-shaped magnets 3 and 4 as seen diagonally above. The acting force always acts in the direction of the center, making it possible to securely fix the C-shaped magnet, and when inserting the stopper protrusion 2, it is inserted into the wide outer gap t1 in the gap, making the assembly process smooth and easy. Moreover, since a pair of positioning protrusions 6 are provided in the long axis direction of the integrally molded oval ring, rotation in the circumferential direction can be prevented, and the magnet can be fixed in the correct position. There are many things.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of the device of the present invention, Fig. 2 is a rear view of the oval ring, Fig. 3 is a side view of the oval ring, Fig. 4 is a rear view of the oval ring deformed by pressure, and Fig. 5 is a rear view of the oval ring deformed by pressure. The figure is a front view of the assembled device of the present invention, Figure 6 is a front view of the C-shaped magnet properly arranged, Figure 7 is a side view of the case body, and Figures 8 to 10 are other embodiments. An example is shown in FIG. 8, which is a rear view of the oval ring, FIG. 9, which is a side view, and FIG. 10, which is a side view of the case body. 1...Oval ring, 2...Stopper protrusion, 3゜4...C-shaped magnet, 5...Case body, 6... Positioning protrusion.

Claims (1)

[Scope of utility model registration request] An elliptical ring 1 is integrally molded from synthetic resin or the like, and a pair of positioning projections 6 are provided facing each other in the direction of its major axis, and a pair of stopper projections 2 as a rigid body having a width t are provided facing each other in the direction of its short axis. , the above-mentioned middle t is the outer interval t1 when the C-shaped magnets 3 and 4 are properly arranged inside the case body 5.
and an elliptical ring 1 in the width between t2 and the inner interval
A fixing device for a split type field magnet, which is deformed under pressure and fitted into a case body to fix C-shaped magnets 3 and 4.