JP2000329581A - Magnet ring for steering angle sensor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnet ring for steering angle sensor which can simplify the manufacturing facility and reduce the material loss, and at the same time, can be efficiently formed in a high quality. SOLUTION: A ring body of a appropriately selected size is divided equally in the circumferential direction into three rubber magnet divided pieces 2a, 2b and 2c. The divided pieces are used and assembled in a ring body, thereby, a magnet ring body is formed. The magnet ring body (each of rubber magnet divided pieces 2a, 2b, 2c) is magnetized to have a predetermined magnetic field distribution. The magnet ring for steering angle sensor and its manufacturing, method in which the manufacturing facility can be simplified and material loss can be reduced, and at the same time, the magnet ring can be efficiently formed in a high quality, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet ring for a steering angle sensor used for, for example, a steering angle sensor of a vehicle and a method of manufacturing the same, and more particularly to simplifying manufacturing equipment and reducing material loss, and at the same time, improving efficiency. The present invention relates to a magnet ring for a rudder angle sensor that can be well manufactured with high quality and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as this kind of magnet ring for a steering angle sensor, for example, one disclosed in Japanese Patent Application Laid-Open No. 63-295918 is known. The rudder angle sensor magnet ring has a base made of an integrally molded ring obtained by integrally molding a magnet material and a resin magnet material in a state of being arranged in a ring shape, as shown in FIG. The ring 101 of the molded product is formed so as to have a magnetic field distribution such that N and S poles are generated along the circumferential direction by a predetermined number that is appropriately selected. Therefore, there is almost no material loss when producing the magnet ring for the steering angle sensor.

On the other hand, there is a demand for simplifying manufacturing equipment for a process of obtaining an integrally molded product. This demand can be dealt with by a method of punching a plate-like rubber magnet base into a shape of a magnet ring.

[0004]

However, in the case where a method of punching a plate-like rubber magnet base material into a shape of a magnet ring as in the prior art is employed, the steering shaft portion is removed for convenience. There is a problem that the material loss is about 80 to 90% and the manufacturing cost is high.

[0005] Further, there is a limit in increasing the number of punched pieces in the shape of a magnet ring for each plate-like rubber magnet base material, and there is a problem that it is not possible to cope with a demand for more efficient manufacture. Was.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a magnet ring for a steering angle sensor and a method for manufacturing the same, which can simplify manufacturing equipment and reduce material loss, and can be efficiently manufactured with high quality. I have.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an annular body having an appropriately selected size is divided into equal parts along a circumferential direction. The method is characterized in that a plurality of rubber magnet divided pieces are assembled into an annular shape using a plurality of pieces, and each rubber magnet divided piece is magnetized so as to have a predetermined magnetic field distribution.

According to the first aspect of the present invention, the rubber magnet split pieces may be manufactured so as to be assembled into an annular shape.
It can be manufactured by punching using a plate-like rubber magnet base material without waste. Therefore, it is possible to contribute to the simplification of the manufacturing equipment and efficiently suppress the material loss at the time of manufacturing.

In order to obtain a magnet ring structure by assembling a plurality of the rubber magnet divided pieces into an annular body shape, it is only necessary to place the ends of the rubber magnet divided pieces in abutment with each other. It does not become a factor of deteriorating, and can cope with a demand for efficiently producing a magnet ring.

In addition, since the entire structure of the magnet ring itself is a conventional structure, a known method can be used as it is to magnetize each rubber magnet segment so as to have a predetermined magnetic field distribution. .

Through such a series of operations, a magnet ring for a steering angle sensor of high quality can be produced as desired.

According to a second aspect of the present invention, the rubber magnet split pieces are formed by punching a large number of pieces from a plate-like rubber magnet base material at the same time.

According to the second aspect of the present invention, since a large number of rubber magnet divided pieces can be manufactured at once in a pre-process before assembling into an annular body shape, material loss at the time of punching is reduced to, for example, about 30%. It can contribute to reduction of manufacturing cost.

According to the third aspect of the present invention, the magnet ring is
The plurality of rubber magnet split pieces are stuck on a ring pedestal and assembled into an annular shape.

According to the third aspect of the present invention, since the ring pedestal is used, the operation of arranging the ends of the plurality of rubber magnet divided pieces in abutment with each other can be performed more efficiently.

According to a fourth aspect of the present invention, a rubber magnet divided piece is formed by punching out an annular body having a size appropriately selected from a plate-like rubber magnet base and equally divided along a circumferential direction. It is characterized in that a plurality of the rubber magnet divided pieces are assembled in an annular body shape to form a magnet ring, and the magnet ring is magnetized so as to have a predetermined magnetic field distribution.

According to the fourth aspect of the present invention, the rubber magnet split pieces can be easily and efficiently manufactured by punching, and a plurality of rubber magnet split pieces obtained by the punching processing are assembled into an annular shape. Work can be done efficiently,
Thereafter, by performing magnetization so as to have a predetermined magnetic field distribution, it is possible to manufacture a magnet ring for a steering angle sensor with high quality as desired.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a magnet ring for a steering angle sensor and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of a magnet ring for a steering angle sensor according to the present invention, and FIG. 2 is an exploded perspective view of the magnet ring for a steering angle sensor of FIG.

This magnet ring 1 for a steering angle sensor has three rubber magnet split pieces 2 each having a three-piece structure in which an annular body having an appropriately selected size is divided into three equal parts along the circumferential direction.
a, 2b, 2c and a ring base 3 made of plastic or the like
And

Three rubber magnet split pieces 2a, 2b, 2c
Is attached to and fixed to the ring pedestal 3 so that its own end portions are arranged so as to abut each other, and have a structure showing the external shape of the magnet ring body 1a assembled into a desired annular body shape.

After obtaining the external shape of the magnet ring 1a, in this embodiment, a known magnetizing method is used, and the N and S poles are appropriately adjusted along the circumferential direction with respect to the magnet ring 1a. It is magnetized so as to have a magnetic field distribution so as to be generated by a selected fixed number.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnet ring 1 for a steering angle sensor according to the present invention thus manufactured is formed by rubber magnet divided pieces 2a, 2b, 2c having a plurality of divided structures as described above.
In order to confirm whether or not this effect appears in the magnetic field distribution of the magnet ring 1, an experiment was performed in which the cutting point was specified and the magnetic field distribution characteristics were measured for the integrally formed magnet ring. The measurement results as shown in the magnetic field distribution characteristic data were obtained. In FIG. 3, the vertical axis represents the magnetic flux density B [gauss], and the horizontal axis represents the angle [deg].

In an experiment for measuring the magnetic field distribution characteristics by specifying the cutting point, the magnet ring of the integrally molded product was subjected to N
The magnetic field distribution was divided at three points of the boundary between the pole, the south pole, and the north and south poles, and the difference in the magnetic field distribution was observed.
The characteristic shows that the magnetic flux density B oscillates in the range of about ss], and no difference was observed between the divided portion and the undivided portion. From this, it was found that the division position of the magnet ring 1 may be a suitably selected position.

Further, for the purpose of an experiment, a magnet ring of an integrally molded product and a magnet ring of an assembled structure of a divided product according to the present invention were experimentally manufactured, and an experiment for measuring magnetic field distribution characteristics was performed on these. However, measurement results as shown in the respective magnetic field distribution characteristic data of FIGS. 4 and 5 were obtained.
4 and 5, the vertical axis represents the magnetic flux density B [ga
uss], and the horizontal axis is an angle [deg].

Here, the integrally molded magnet ring is formed by stamping out an integrally formed rubber magnet from a plate-shaped rubber magnet base material into an annular body having an appropriately selected size, and then forming the integrally molded rubber magnet to have substantially the same size. In the state of being attached to a ring pedestal having an annular body shape, it is magnetized so as to have a predetermined magnetic field distribution, and as shown in the magnetic field distribution characteristic data of FIG. The characteristic shows that the magnetic flux density B oscillates in the range of about [gauss].

On the other hand, a magnet ring having a structure for assembling a divided product according to the present invention means that an annular body having a size appropriately selected from a plate-like rubber magnet base material is punched into a shape obtained by dividing the annular body into a plurality of sections at equal intervals. The three rubber magnet pieces prepared in the above are attached to a ring pedestal to form a magnet ring by assembling into a ring shape, and the magnet ring is magnetized so as to have a predetermined magnetic field distribution. And ± 7 at any angular position as shown in the magnetic field distribution characteristic data of FIG.
The characteristic shows that the magnetic flux density B oscillates in a range of about 5 [gauss].

Comparing the two, the case of an integrally molded product also
It was also verified that the same magnetic field distribution was obtained in the case of assembling the divided products.

However, as described above, in a case where a method of punching a plate-like rubber magnet substrate into a shape of a magnet ring is employed, a material loss of 80 to 90 at the time of manufacturing is required because the steering shaft portion is removed. %, Which causes a problem that the manufacturing cost is increased.

On the other hand, the rubber magnet split pieces 2a, 2 used in the magnet ring of the split product assembly structure according to the present invention.
Since b and 2c may be manufactured so as to be assembled into an annular shape, they can be manufactured by punching using a plate-like rubber magnet base material without waste. Therefore, it is possible to contribute to the simplification of the manufacturing equipment and efficiently suppress the material loss at the time of manufacturing.

The rubber magnet split pieces 2a, 2b, 2
In order to obtain a magnet ring structure by assembling a plurality of pieces of c into an annular shape by using a plurality of pieces, it is only necessary to place the ends of the rubber magnet divided pieces in abutment with each other. Therefore, it is possible to cope with a demand for efficiently producing a magnet ring.

Since the entire structure of the magnet ring itself is the same as the conventional structure, each of the rubber magnet divided pieces 2a, 2b,
A known method can be used as it is as a method of magnetizing 2c so as to have a predetermined magnetic field distribution.

Through such a series of operations, a magnet ring for a steering angle sensor of high quality can be produced as desired. In particular, as shown in FIG. 6, when a large number of rubber magnet split pieces 2 are simultaneously punched from a single plate-like rubber magnet base material 4 in a pre-process before assembling into an annular body shape. Since the rubber magnet split pieces 2 can be manufactured in large quantities in a lump, material loss at the time of punching can be reduced to, for example, about 30%, which can contribute to a reduction in manufacturing cost.

Each of the rubber magnet split pieces 2a, 2b, 2c
Is attached to the ring pedestal 3 and assembled into an annular body shape to obtain the magnet ring body 1a. Therefore, the operation of arranging the ends of the rubber magnet divided pieces 2a, 2b, 2c in abutting relation to each other. Can be performed more efficiently.

As described above, in this embodiment, the rubber magnet divided piece 2 is punched into a shape obtained by dividing an annular body having an appropriately selected size from the plate-shaped rubber magnet base 4 into a plurality of sections at equal intervals. By using a plurality of the rubber magnet divided pieces 2 and assembling them into an annular shape using a plurality of pieces, a magnet ring body 1a is formed, and the magnet ring body 1a is magnetized so as to have a predetermined magnetic field distribution. Then, the magnet ring 1 for a steering angle sensor according to the present invention is manufactured.

Therefore, according to this embodiment, the rubber magnet split piece 2 can be easily and efficiently manufactured by punching, and the plurality of rubber magnet split pieces 2 obtained by this punching can be formed into an annular body. The work of assembling into a shape can be performed efficiently, and thereafter, by magnetizing so as to have a predetermined magnetic field distribution, a magnet ring 1 for a steering angle sensor with high quality can be produced as desired.

In this embodiment, the rubber magnet divided piece has a three-part structure in which an annular body having an appropriately selected size is divided into three equal parts along the circumferential direction. The present invention is not limited to this.
A six-part structure may be used.

[0038]

As is apparent from the above description, according to the present invention, a magnet ring for a steering angle sensor and a magnet ring for a steering angle sensor which can be manufactured efficiently and with high quality while simplifying manufacturing equipment and reducing material loss. A manufacturing method can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnet ring for a steering angle sensor according to the present invention.

FIG. 2 is an exploded perspective view of the steering angle sensor magnet ring of FIG. 1;

FIG. 3 is an explanatory diagram showing magnetic field distribution characteristic data obtained in an experiment in which a cutting point is specified and a magnetic field distribution characteristic is measured for a magnet ring of an integrally molded product.

FIG. 4 is an explanatory diagram showing magnetic field distribution characteristic data obtained in an experiment for measuring magnetic field distribution characteristics for a magnet ring of an integrally molded product prototyped for the experiment.

FIG. 5 is an explanatory view showing magnetic field distribution characteristic data obtained in an experiment for measuring magnetic field distribution characteristics for a magnet ring having a structure for assembling a divided product according to the present invention, which was experimentally produced for an experiment.

FIG. 6 is an explanatory view showing a step of producing a large number of rubber magnet split pieces from a single plate-like rubber magnet base material by punching at the same time.

FIG. 7 is an explanatory view showing an example of a conventional magnet ring for a steering angle sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet ring for rudder angle sensor 1a Magnet ring body 2, 2a, 2b, 2c Rubber magnet split piece 3 Ring pedestal 4 Plate-shaped rubber magnet base material

Claims (4)

[Claims] 1. An annular body having an appropriately selected size is equally divided along a circumferential direction into a plurality of divided rubber magnet divided pieces and assembled into an annular body shape using a plurality of pieces. A magnet ring for a steering angle sensor, which is magnetized so as to have a predetermined magnetic field distribution. 2. The rudder angle sensor magnet ring according to claim 1, wherein the rubber magnet split pieces are formed by simultaneously punching a large number of pieces from a plate-shaped rubber magnet base material. Characteristic magnet ring for steering angle sensor. 3. The rudder angle sensor magnet ring according to claim 1, wherein the plurality of rubber magnet split pieces are attached to a ring base and assembled into an annular body. Magnet ring for angle sensor. 4. A rubber magnet split piece having a divided shape obtained by equally dividing an annular body having a size appropriately selected from a plate-shaped rubber magnet base material along a circumferential direction is produced. A method for manufacturing a magnet ring for a steering angle sensor, comprising forming a magnet ring by assembling a plurality of pieces into an annular shape, and magnetizing the magnet ring so as to have a predetermined magnetic field distribution.