JP2003077725A - Method for manufacturing pulser ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a pulser ring which can increase magnetization intensity in spite of a half-cell magnetizing method and assure a magnetic characteristic with high accuracy. SOLUTION: For example, five magnetization yokes 11, 12 and 13 which face magnetic poles so as to interpose a magnetized member 3 between both plates are disposed at gaps corresponding to 1 pitch, and the magnetic poles of these magnetization yokes 11, 12 and 13 are formed alternately in the direction of moving the magnetized member. Further, the central magnetization yoke 11 is formed as a main magnetization yoke having maximum magnetization intensity, and the magnetization intensity of the remaining magnetization yokes 12, 13 is weakened as being away from the main magnetization yoke 11, thereby magnetizing to the magnetized member 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile ABS.
The present invention relates to a method of manufacturing a pulsar ring which constitutes a rotation speed detecting device used in, for example, and in which a large number of magnetic poles are alternately formed at equal intervals.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a rolling bearing unit with a sensor in which a pulser ring manufactured according to the present invention is used. The bearing unit is a rolling bearing.
It is equipped with (1), a sensor device (2) provided for it, and a pulsar ring (3) which is a detected part.

The rolling bearing (1) has an outer ring (4) which is a fixed ring,
It is provided with an inner ring (5) which is a rotating wheel, and balls (6) which are a plurality of rolling elements arranged between them. Although illustration is omitted,
The outer ring (4) is fixed to a housing or the like, and the inner ring (5) is fixed to a rotating shaft or the like.

The pulsar ring (3) includes a support member (7) fixed to the inner ring (5) and a magnetized body (8) fixed to the support member (7).
And consists of. The support member (7) is a small-diameter cylindrical portion (7a) fitted on the outer circumference of the inner ring (5), and a perforated disk portion (flange portion) extending radially outward from the right end of the small-diameter cylindrical portion (7a). (7b),
It is composed of a large-diameter cylindrical portion (7c) extending from the outer peripheral edge portion of the perforated disc portion (7b) to the right, and has an annular shape as a whole.

An annular seal groove (9) is formed on the shoulder of the inner diameter of the right end of the outer ring (4). The outer peripheral edge portion of the contact seal (10) is fitted to the seal groove (9), and the inner peripheral edge portion of the seal (10) is a small diameter cylindrical portion (7) of the support member (7) of the pulsar ring (3).
It touches the left edge of a).

The sensor device (2) includes a case (11) fixed to the outer ring (4) and a sensor (12) provided in the case (11).
And a sensor control section (13), and is opposed to the pulsar ring (3) from the outside in the radial direction.

The case (11) is composed of an outer peripheral wall (11a) and an inner peripheral wall (11b) in the shape of a short cylinder, and a perforated disc-shaped side wall (11c) that connects the right ends of these to each other. The hollow portion has a substantially U-shaped cross section. The free end (left end) of the outer peripheral wall (11a) extends to the left of the inner peripheral wall (11b), and the free end of this outer peripheral wall (11a) is tightly fitted onto the shoulder of the right end of the outer ring (4). The free end of the inner peripheral wall (11b) is close to the right end surface of the inner ring (5) near the inner diameter.

FIG. 5 shows another example of the sensor-equipped rolling bearing unit in which the pulser ring manufactured according to the present invention is used, in which the support member (7) is the inner ring (5).
Of the cylindrical portion (7a) fitted on the outer periphery of, and a point consisting of the outward flange portion (7b) provided at the right end of the cylindrical portion (7a),
The point that the magnetized body (8) is provided on the outer surface of this flange portion (7b) and the point that the sensor device (2) is opposed to the pulsar ring (3) from the outside in the axial direction are as shown in FIG. Is different from

Conventionally, as a method of manufacturing the above-mentioned pulser ring, an all-pole magnetizing method is known in which a magnetizing yoke is pressed against a magnetized member to magnetize a large number of magnetic poles at the same time. In this all-pole magnetizing method, there is a limit to the processing accuracy of the magnetizing yoke,
There is a problem that high pitch accuracy cannot be obtained.

Therefore, as a magnetizing method for improving the pitch accuracy, while rotating the magnetized member at a predetermined pitch,
A single pole magnetizing method in which the S pole and the N pole are sequentially magnetized has been considered. Fig. 1 shows the basic configuration for performing the unipolar magnetization method.
Shown in.

In FIG. 1, a magnetized member (3) is a support member (7) and a rubber magnetic body fixed to the peripheral surface of the support member (7).
(8) and are provided. The magnetizing yoke (11) is the magnetized member (3).
The magnetic poles (11a) and (11b) are opposed to each other so as to sandwich them from both sides. The N pole and S pole of the magnetic poles (11a) (11b) are reversed by changing the direction of the current flowing through the coil (16) (changing the direction of the power supply (17) to the solid line and the chain line in the figure). be able to. Therefore, by setting the pole (11a) of the magnetizing yoke (11) on the rubber magnetic body (8) side to the N pole, the front side pole of the rubber magnetic body (8) is magnetized to the S pole, and then After rotating the magnetizing member (3) a certain amount, the pole of the magnetizing yoke (11) on the rubber magnetic body (8) side
By making (11a) the S pole, the front pole of the rubber magnetic body (8) is magnetized to the N pole, and by repeating this in sequence, the S pole and the N pole are provided over the entire circumference of the support member (7). A pulsar ring in which and are alternately formed at an equal pitch is manufactured.

[0012]

In the above-mentioned conventional single pole magnetizing method, since the yoke cannot be brought into close contact with the magnetized member from the viewpoint of preventing scratches, the magnetizing strength is higher than that of the all pole magnetizing. There was a problem that it was inferior. Therefore, it is conceivable to increase the magnetizing strength by increasing the number of turns of the coil used with high voltage. as well as,
The distribution of the magnetic flux in the already magnetized portion is not uniform, which causes a problem that the magnetic characteristics cannot be secured with high accuracy.

An object of the present invention is to provide a method for manufacturing a pulser ring which can increase the magnetizing strength and can secure the magnetic characteristics with high accuracy even though it is a single pole magnetizing method.

[0014]

In the method of manufacturing a pulser ring according to the present invention, the magnetized member is rotated at a predetermined pitch so that the N poles and the S poles are alternately and evenly pitched. When manufacturing the pulsar ring by magnetizing the magnets, at least two magnetizing yokes having magnetic poles facing each other so as to sandwich the magnetized member from both sides are arranged at an interval of one pitch. Alternately in the moving direction of the magnetized member, the main magnetizing yoke having the maximum magnetizing strength is used except for the magnetizing yoke on the frontmost side in the moving direction of the magnetized member, and the remaining magnetized The magnetized member is magnetized such that the magnetizing strength of the yoke is weaker than that of the main magnetizing yoke.

The magnetizing strength can be adjusted by at least the voltage applied to the magnetizing yoke, the current flowing through the magnetizing yoke, the number of turns of the magnetizing yoke coil, and the distance between the magnetizing yoke magnetic pole and the magnetized member. This is done by changing one.

When the number of magnetizing yokes is the smallest, it is 2
Of these, the magnetizing yoke on the rear side (non-magnetized side) of the magnetized member moving direction is the main magnetizing yoke and is on the front side (already magnetized side) of the magnetized member moving direction. The magnetizing strength of the magnetizing yoke is made weaker than that of the main magnetizing yoke. Then, a magnetizing step of forming a magnetic pole by simultaneously using two magnetizing yokes, a rotating step of rotating a magnetized member by one pitch, and a polarity switching step of reversing the polarities of the two magnetizing yokes. Is repeated for all pitches.

According to the method of manufacturing a pulsar ring of the present invention, a plurality of pitches of the magnetized member are magnetized at the same time, and a portion of the plurality of pitches where the main magnetizing yoke is arranged has a required strength. Be magnetized. At this time, a magnetized yoke having a polarity opposite to that of the main magnetized yoke and having a weak strength is opposed to the already magnetized portion immediately in front of the main magnetized yoke.
The magnetic force of the main magnetizing yoke is prevented from reaching this already magnetized portion. As a result, the distribution of the magnetic flux becomes uniform, the magnetizing strength can be increased, and the magnetic characteristics can be secured with high accuracy.

When the number of magnetizing yokes is increased and the magnetizing yokes are respectively arranged in the two magnetized yokes, the main magnetized yokes are located in front of the main magnetized yokes. Magnetizing yokes with the opposite polarity and weak strength are made to face each other,
The magnetic force of the main magnetizing yoke is prevented from reaching the already magnetized portion, and the magnetic force of the magnetizing yoke immediately in front of the main magnetizing yoke is prevented from reaching the already magnetized portion in front of it. As a result, the distribution of the magnetic flux becomes more uniform, the magnetizing strength can be increased, and the magnetic characteristics can be secured with higher accuracy.

In some cases, three or more magnetizing yokes are provided so that the central one has the strongest magnetic strength and the both ends have the weakest magnetic strength.

That is, the central magnetizing yoke is used as the main magnetizing yoke, and the magnetizing yoke having a low magnetizing strength is made to face both the magnetized portion and the magnetized portion.

By doing so, the magnetizing yokes are arranged symmetrically as a whole, the distribution of the magnetic flux becomes uniform, and the magnetizing can be performed accurately.

The main magnetizing yoke is not necessarily limited to one, but may be two or more. For example, an odd number of magnetizing yokes of 5 or more may be used, and the central three of them may be used as a main magnetizing yoke, and an even number of magnetizing yokes of 4 or more may be used. The two magnets in the center may be used as the main magnetizing yoke. When there is one main magnetizing yoke, the magnetized member is rotated by one pitch, and when there are two main magnetized yokes, the magnetized member is rotated by two pitches and the main magnetized member is rotated. When there are three magnetic yokes, the magnetized member is rotated by three pitches.

Further, the number of magnetizing yokes may be three or more so that the magnetizing strength of the magnetizing yoke becomes smaller as the magnetizing yoke moves in the moving direction of the magnetized member from the main magnetizing yoke.

The main magnetizing yoke may be located at the rear end in the moving direction of the magnetized member, or may be located at or near the center.

With this arrangement, the influence of the magnetizing yoke on the adjacent magnetized portion is alleviated as the magnetizing yoke moves in the moving direction of the magnetized member.
It can be accurately magnetized.

Even in this case, the main magnetizing yoke is not necessarily limited to one, but may be two or more. For example, five magnetizing yokes may be used, of which two in the center and one behind the magnetizing yokes may be used as main magnetizing yokes, and six magnetizing yokes may be used. Two in the center of the inside and a total of three in the back may be used as the main magnetizing yoke. When the main magnetizing yoke is one, the magnetized member is rotated by one pitch, and when the main magnetizing yoke is two, the magnetized member is two.
When the main magnetizing yoke is three, the magnetized member is rotated by three pitches.

A restricting member that contacts the magnetized member and secures a predetermined gap with the magnetized yoke may be attached to the magnetized yokes at both ends.

In this case, since the distance between the magnetizing yoke and the magnetized member is kept constant by the regulating member (for example, the sliding plate), the magnetizing strength is increased and the magnetized member is rotated. However, even if magnetized, the magnetized member is not damaged, so that it is possible to obtain a pulsar ring with high pitch accuracy and high magnetizing strength.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an apparatus used in the method for manufacturing a pulsar ring according to the present invention. As shown in the figure, in this manufacturing method, a total of five magnetizing yokes (11), (12) (that sandwich a magnetized member (3) composed of a supporting member (7) and a rubber magnetic body (8) from both sides. 13) is used.

Of these magnetizing yokes (11), (12) and (13), the central one (11) has the maximum magnetizing strength, and the ones on both sides of this magnetizing yoke.
(12) has an intermediate magnetizing strength, and both ends (13) are set so as to have the weakest magnetizing strength.
Magnetic poles (11a) (11b) (12a) (12b) (13a)
(13b) are opposed to each other.

The magnetizing strength is set by at least the voltage applied to the magnetizing yoke, the current flowing through the magnetizing yoke, the number of turns of the magnetizing yoke coil, and the distance between the magnetizing yoke magnetic pole and the magnetized member. It is possible by changing one,
In the figure, the magnetic poles (11a) (11b) (12) of the magnetizing yokes (11) (12) (13)
By changing the distance between a), (12b), (13a), and (13b) and the magnetized member (3), the difference in magnetizing strength is shown.

Magnetic poles (13a) (13b) of the magnetizing yoke (13) at both ends
Of the magnetized member (3) and the magnetized yokes (11), (12) and (13) on the outer side (before and after in the moving direction of the magnetized member (3)) by contacting the magnetized member (3). ) Magnetic pole (11a) (11b) (12a) (12b) (13a) (13
A restricting member (14) for ensuring a predetermined gap with b) is arranged.

The regulating member (14) is a sliding plate (16) which is urged by the spring (15) and brought into contact with the magnetized member (3). The contact portion of the sliding plate (16) is made of, for example, ceramics in order to reduce frictional resistance. Therefore, even if the magnetized member (3) and the sliding plate (16) are in contact with each other, the magnetized member (3) can rotate smoothly. The magnetized member (3) is magnetized by the magnetizing yokes (11) (12) (13).
When approaching one of the magnetic poles (11a) (11b) (12a) (12b) (13a) (13b), the elastic force of the spring (13) increases and the magnetized member (3) Magnetic poles (11a) (11b) of the yoke (11) (12) (13)
Contact with (12a) (12b) (13a) (13b) is prevented. Although not shown, each magnetizing yoke (11) is attached to a supporting portion (17) supporting the sliding plate (16) by a screw or the like so as to be finely adjustable.

In the method of manufacturing the pulser ring according to the present invention, the magnetizing step of forming the magnetic pole by simultaneously using the five magnetizing yokes (11), (12) and (13) and the magnetized member (3) Rotation process of rotating by pitch and five magnetizing yokes (11) (12) (1
The polarity switching step of reversing the polarities of the magnetic poles (11a) (11b) (12a) (12b) (13a) (13b) of 3) is repeated for all pitches.

FIG. 3 shows a process in which the rubber magnetic body (8) is magnetized by the manufacturing method of the present invention. In the following description, the magnetic poles of the magnetizing yokes (11), (12) and (13) are referred to as the upper magnetic pole in the figure, and the rubber magnetic material is used.
The magnetic pole generated in (8) is the magnetic pole on the upper side (front side) in the figure.

In the state shown in FIG. 3A, the magnetic poles of the central magnetizing yoke = the main magnetizing yoke (11) are S poles (strong in strength), and the magnetizing yokes (12) on both sides of the magnetizing yoke (12). ) Is an N pole (medium strength), and the magnetic poles of the magnetizing yokes (13) at both ends are S poles (small strength). These magnetizing yokes (11) (12)
Assuming that one pitch of the rubber magnetic material (8) corresponding to (13) is A, B, C, D, E from the frontmost side in the moving direction, the portions A and B are already magnetized to the required strength. Therefore, the portion C corresponding to the main magnetizing yoke (11) is newly magnetized to the N pole having the required strength. At this time, the D portion is magnetized to the S pole (medium strength) and the E portion is magnetized to the N pole (small strength). A magnetizing yoke (13) having an S pole (small strength) is provided at the A (N-polarized) portion, and an N pole is provided at the B (S-polarized) portion.
The magnetizing yokes of the poles (medium strength) are made to correspond to each other, but these magnetizing yokes (12) (13) have the same magnetic pole as that already magnetized and the strength is smaller than that. Therefore, the magnetic poles and the magnetization strength of the portions A and B do not change. The portion of F on the rear side of E is not magnetized at this stage.

Next, as shown in (b), the rubber magnetic body (8) is rotated by one pitch, and the magnetic pole of the central magnetizing yoke = main magnetizing yoke (11) is the N pole (strength). Large), the magnetic poles of the magnetizing yokes (12) on both sides of the magnetic pole are changed to S pole (medium strength), and the magnetic poles of the magnetizing yokes (13) at both ends are changed to N pole (small strength). As a result, the D portion corresponding to the main magnetizing yoke (11) is newly magnetized to the S pole having the required strength. The portion D is already magnetized at the time of (a), but since it has the same south pole and medium strength, it has an influence on the magnetization by the main magnetizing yoke (11) having a larger strength than this. There is no such thing.

Of the five magnetizing yokes (11) and (12) shown in FIGS. 2 and 3, the minimum necessary for implementing the present invention is the main magnetizing yoke (11) in the center. ) And a magnetizing yoke (12) in front of it. That is, a main magnetizing yoke (11) magnetized to a required strength and a sub-magnetizing yoke (12) arranged on the front side in the moving direction of the main magnetizing yoke (11) to suppress the influence of the main magnetizing yoke (11) on the already magnetized portion. There should be And
By arranging another sub-magnetization yoke (13) arranged on the front side in the moving direction of the sub-magnetization yoke (12) to suppress the influence of the sub-magnetization yoke (12) on the already magnetized portion, The accuracy can be further improved. Further, by arranging the sub-magnetization yokes (12) and (13) on the rear side in the moving direction of the main magnetization yoke (11) so as to be symmetrical, the distribution of the magnetic flux becomes uniform, and It can be magnetized by rotating the magnetized member (3) either forward or backward.

In the above pulsar ring manufacturing method, the magnetized member (3) is, for example, a servomotor,
The rotation angle can be controlled with high precision and rotated. Then, even if the magnetic force applied to the magnetized member (3) is increased, since the regulating member (12) is in contact with the magnetized member (3), the magnetizing yokes (11) (12) (13) Magnetic pole (11a) (11b) (12a) (12b) (13a)
The magnetized member (3) does not come into contact with the magnetized member (3), and even if the magnetized member (3) is magnetized while being rotated, the magnetized member (3) is not damaged. Therefore, it is possible to obtain a pulsar ring with high pitch accuracy and large magnetic force.

The shape of the supporting member (7) of the pulsar ring manufactured by this manufacturing method may be a cylindrical body, and as shown in FIG. 4, the small diameter cylindrical portion (7a) and the flange portion are formed. (7b) and a large-diameter cylindrical portion (7c), or, as shown in FIG. 5, a cylindrical portion and an outward flange portion provided at one end thereof, Furthermore, it may be composed of a cylindrical portion and an inward flange portion provided at one end thereof. The rubber magnetic body (8) may be attached to the outer periphery of the cylindrical body or the large-diameter cylindrical portion, or may be attached to the side surface of the outward or inward flange portion.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic configuration of a conventional method for manufacturing a pulsar ring.

FIG. 2 is a diagram showing an embodiment of an apparatus for carrying out the method for manufacturing a pulser ring according to the present invention.

FIG. 3 is a diagram showing a process of being magnetized.

FIG. 4 is a longitudinal sectional view showing an example of a rolling bearing unit with a sensor in which the pulser ring according to the present invention is used.

FIG. 5 is a vertical cross-sectional view showing another example of a rolling bearing unit with a sensor in which the pulser ring according to the present invention is used.

[Explanation of symbols]

(3) Magnetized member (pulsar ring) (8) Rubber magnetic body (magnetized body) (11) (12) (13) Magnetizing yoke (11a) (11b) (12a) (12b) (13a) (13b) Magnetic pole (14) Control member (15) Spring (16) Sliding plate

Claims (4)

[Claims] 1. When manufacturing a pulsar ring by rotating a magnetized member at a predetermined pitch so that the N poles and the S poles are alternately arranged at equal pitches, both sides of the magnetized member are manufactured. At least two magnetizing yokes whose magnetic poles face each other so as to be sandwiched between the magnetizing yokes are arranged at intervals of one pitch so that the magnetic poles of these magnetizing yokes alternate with each other in the moving direction of the magnetized member. Except for the foremost magnetizing yoke in the member moving direction, the main magnetizing yoke with the maximum magnetizing strength is used, and the remaining magnetizing yokes have weaker magnetizing strength than that of the main magnetizing yoke. A method for manufacturing a pulsar ring, which comprises magnetizing a magnetized member. 2. The method of manufacturing a pulsar ring according to claim 1, wherein three or more magnetizing yokes are provided so that the central one has the strongest magnetic strength and the both ends have the weakest magnetic strength. . 3. The number of magnetizing yokes is three or more, and the magnetizing strength of the magnetizing yoke decreases as the magnetizing yoke moves in the moving direction of the magnetized member. 1. A method for manufacturing a pulsar ring. 4. A pulsar according to claim 1, 2 or 3, wherein a restricting member that comes into contact with the magnetized member and secures a predetermined gap between the magnetized yokes is attached to the magnetized yokes at both ends. Ring manufacturing method.