JP2005300300A - Pulsar ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulsar ring improved furthermore, capable of securing a wide detection area so as to improve rotation detection accuracy or sensitivity, while preventing generation of waviness of a rubber magnet body caused at the sheet metal working time of a core metal. <P>SOLUTION: This pulsar ring 10 comprises the flat toroidal rubber magnet body 11 wherein many S-poles and N-poles are polarized alternately in the circumferential direction, and the core bar 12 made of a steel plate for supporting the rubber magnet body 11 in the integrally stuck state. The pulsar ring 10 is characterized as follows: the core metal 12 is equipped with a double cylinder part 12c bent so as to be folded by bending a flat toroidal steel plate member, and a support end face part 11a comprising an inward collar piece 12b and an outward collar piece 12a formed in a state linked to non-bent side both ends of the double cylinder part 12c; the double cylinder part 12c is an interfitting cylinder 12c interfitted integrally onto the rotation side of a bearing 9; and the rubber magnet body 11 is stuck so as to stride over the inward collar piece 12b and the outward collar piece 12a across a flat toroidal spacer member S made of a steel plate relative to the support end face part 11a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pulsar ring, and more particularly to an improvement in a pulsar ring for detecting a rotational speed used in an automobile ABS or the like.

Conventionally, the pulser ring is paired with a magnetic sensor mounted on the fixed side to detect the rotational speed of the wheel in order to control the anti-lock brake system (ABS), traction control system (TCS), etc. It is equipped on the rotation side member of the bearing.
This pulsar ring is composed of a rubber magnet body that generates pulses and a cored bar for attaching and supporting it, but the conventional one is also used as a slinger for the bearing seal ring. The radial dimension of the ring-shaped rubber magnet body (rotation detection surface) is small, and the rotation detection surface for sensing has a large area and provides magnetic properties. It was difficult to improve, and there was a limit to improving rotation detection accuracy and sensitivity.

Therefore, in order to increase rotation detection accuracy and sensitivity by forming a large area of the rotation detection surface, it has been tried to increase the radial length of the core bar provided on the rotation side member of the bearing. That is, a ring-shaped (flat annular) core bar is press-molded so that its cross-sectional shape is a horizontal “T” shape, and its radial width is widened so that it can be fitted and mounted on the rotation side member. A means for making a large area of the rubber magnet body attached to the rubber magnet body has been proposed.
As such an example, there is Patent Document 1 filed earlier.

FIG. 8 is a diagram showing an example of a pulsar ring structure proposed in Patent Document 1. In FIG.
As shown in FIG. 8, the proposed pulsar ring 100 includes a double cylindrical portion 120c that is refracted to be folded by bending a cored bar 120, and an antirefracting side of the double cylindrical portion 120c. And a support end surface portion 110a composed of an inward flange piece 120b and an outward flange piece 120a formed continuously at both ends, and the double cylindrical portion 120c is a fitting cylinder integrally fitted on the rotation side of the bearing. The magnet body 110 has a structure that is adhered to the support end surface portion 110a so as to straddle the inward flange piece 120b and the outward flange piece 120a.

That is, the core bar 120 is refracted so as to be folded in a transverse “T” shape in cross section, and the inwardly facing piece 120b and the outwardly facing piece 120a formed continuously at both ends of the antirefracting side are substantially one plane. Since the rubber magnet body is pasted so as to straddle the inwardly facing piece 120b and the outwardly facing piece 120a, the area of the rotation detecting surface 110b can be increased, and the accuracy and sensitivity of the pulsar ring are improved. Is possible. A magnetic sensor 24 is paired with the pulsar ring 100.
JP 2003-294778 A

However, it has been found that the following inconvenience occurs in the structure in which the core bar 120 is refracted so as to be folded into a “T” -shaped cross section.
When a flat annular steel plate member is bent (sheet metal processing) as shown in FIG. 8, due to the characteristics of the steel plate material, the plasticity is greatly distorted and both ends of the antirefracting side are wavy. In particular, since the diameter of the inwardly facing piece 120b is small, distortion is likely to occur and it is easy to wave.

  As described above, when both end portions on the anti-refractive side, that is, the support end surface portion 110a are wavy, the rotation detecting surface 110b of the rubber magnet body 110 that is affixed to the rubber magnet body 110 is also wavy. As a result, the flatness of the rotation detection surface 110b cannot be obtained, the magnetic characteristics become non-uniform, and the rotation detection accuracy deteriorates. Therefore, such inconvenience must be avoided.

  The present invention has been made in view of such circumstances, and has a wide detection area so that rotation detection accuracy and sensitivity can be improved while preventing the above-described disadvantage caused by the processing of the core metal sheet. The aim is to provide a further improved pulsar ring that can be secured.

In order to achieve the above object, in claim 1, a flat annular rubber magnet body in which a number of S poles and N poles are alternately magnetized in the circumferential direction, and the rubber magnet body are integrally supported. A pulsar ring consisting of a steel sheet metal core
The cored bar is formed by bending a flat annular steel plate member so as to be folded so as to be folded, and an inwardly facing strip formed at both ends of the anti-refractive side of the double cylindrical portion. And the supporting end surface portion made of an outwardly facing piece, the double cylindrical portion is a fitting cylinder integrally fitted on the rotation side of the bearing, and the rubber magnet body is a steel plate with respect to the supporting end surface portion. Proposed is a pulsar ring characterized by being attached so as to straddle an inwardly facing piece and an outwardly facing piece through a flat annular spacer member.

  A second aspect of the present invention proposes a pulsar ring according to the first aspect, wherein a through-hole penetrating inward and outward is formed in a wall portion of the fitting cylinder.

  A third aspect proposes a pulsar ring according to the first or second aspect, wherein a through hole is formed in the flat annular spacer member.

  A pulsar ring according to claim 4, wherein a cutout hole is formed in the flat annular spacer member.

  A fifth aspect of the present invention proposes a pulsar ring according to any one of the first to fourth aspects, wherein the cored bar also serves as a slinger for a bearing seal ring.

  A sixth aspect of the present invention proposes a pulsar ring according to any one of the first to fifth aspects, wherein the rubber magnet body is adhered to the support end surface portion by vulcanization adhesion.

According to the first aspect of the present invention, since the rubber magnet body is attached to the support end surface portion via the steel plate flat annular spacer member, the corrugation of the support end surface portion by the sheet metal processing of the core metal is performed. Even if there is, there is no direct effect on the rubber magnet body, and the rotation detection surface does not wave. Therefore, the flatness of the rubber magnet body can be kept uniform, and the rotation detection accuracy and sensitivity can be improved.
In addition, when heat-bonding (also referred to as vulcanization bonding) the rubber magnet body to the spacer member and the support end surface, gas is generated from the rubber itself of the rubber magnet body, and the inwardly facing strip and the outward facing Even if the gas is filled in the gap between the two pieces, the processing liquid remaining in the overlapping part of the double cylindrical part during the degreasing process of the core metal is the heat during the sticking process of the rubber magnet body. Even if the gasification is performed, the spacer member serves as a barrier to prevent so-called air bulging in the rubber magnet body.

  According to the second aspect of the present invention, gas is generated from the rubber itself of the rubber magnet body by heat when the rubber magnet body, the spacer member, and the support end face are heated and bonded, and the inwardly facing strip and the outwardly facing surface Even if the gap is filled with the above gas, the processing liquid remaining in the overlapping part of the double cylindrical part during the degreasing process of the core metal is caused by the heat during the sticking process of the rubber magnet body. Even if it is gasified, the rubber magnet body does not cause air blistering because it is quickly released from the through hole and the spacer member guards the gas magnet from filling the rubber magnet body.

  According to the invention described in claim 3, since the through hole is formed in the flat annular spacer member, the adhesive or rubber itself to be used flows into the through hole when the rubber magnet body is stuck. By the anchor effect of the flowed-in part, the adhesion and integration with the cored bar through the spacer member of the rubber magnet body can be strengthened.

  According to invention of Claim 4, since the notch hole is formed in the flat annular spacer member, adhesion | attachment with a rubber magnet body and a metal core can be strengthened.

  According to the fifth aspect of the present invention, since the cored bar can also serve as a slinger for the bearing seal ring, it is not necessary to increase the number of parts.

  According to the sixth aspect of the present invention, when a through hole penetrating inward and outward is formed in the wall portion of the double cylindrical portion, the rubber magnet body, the spacer member, and the support end surface portion are heated and bonded (added). Even if the gas generated from the rubber itself of the rubber magnet body or the gas resulting from the degreasing treatment of the core metal is generated by the heat in the case of (sulfur bonding), these gases can be discharged to the outside without difficulty, and the steel plate flat ring Since it sticks through a spacer member, it can stick to a uniform surface, and a rotation detection surface does not wave and a magnetic characteristic does not become non-uniform | heterogenous.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a structural example of a typical rotation speed detection system incorporating a pulsar ring will be described.

  FIG. 1 shows an angular bearing 9 that rotatably supports a drive wheel such as a tire of an automobile, and a structure around it.

  As shown in FIG. 1, the bearing 9 is for constituting a wheel, and an inner ring (an example of a rotation side member) 5 in which a hub (not shown) on the rotation side is fitted is a non-rotation side. The hub carrier 8 (an example of a fixed member) is rotatably supported, and is provided between the outer ring 13 that is a part of the hub carrier 8, the inner ring 5, and the outer ring 13 and the inner ring 5. It is comprised from the ball | bowl (rotating sphere) 15 which is two rolling elements of right and left, and the retainers 1 and 2 for arranging these balls 15 at equal intervals in the circumferential direction.

An inner seal ring 16 and an outer seal ring 17 are respectively provided between inner (vehicle body side) and outer end portions in the left-right direction of the outer ring 13 and the inner ring 5.
Reference numeral 3 denotes mounting bolts for mounting and fixing the hub carrier 8 also serving as the outer ring 13 to, for example, a support member 14 on the vehicle body side, and a plurality of mounting bolts are provided at equal intervals in the circumferential direction. A mounting hole 4 is formed at the center of the inner ring 5 for inserting and mounting the hub or the shaft portion of the constant velocity joint. The inner and outer seal rings 16 and 17 prevent the lubricating oil such as grease filled in the ball 15 portion from flowing out to the outside and prevent dust such as dust and foreign matter from flowing into the ball 15 portion from the outside.

  A magnetic sensor 24 fixed to the hub carrier 8 via the mounting stay 6 is provided at a position near the side of the inner seal ring 16, and this magnetic sensor 24 and a pulsar provided to the inner seal ring 16 are provided. The ring 10 constitutes a rotational speed detection device (encoder) capable of detecting the rotational speed of the wheel, that is, the inner ring 5 per unit time. Reference numeral 7 denotes a lead wire connected to the magnetic sensor 24.

  FIG. 2 is an enlarged cross-sectional view of a main part of the bearing 9 in which the pulsar ring 10 of the present invention is incorporated. Here, as an example, the wall surface of the double cylindrical portion 12c of the pulsar ring 10 is provided with a through hole H penetrating inward and outward.

  An inner seal ring 16 and an outer seal ring 17 are interposed between inner end portions and outer end portions of the fixed side member (outer ring) 13 and the rotation side member (inner ring) 5 in the left-right direction. . The inner seal ring 16 includes a fixed core 18 that is press-fitted into the inner peripheral surface of the outer ring 13, a rubber seal lip 19 that is fixed to the core 18, and a rotary side that is press-fitted to the outer peripheral surface of the inner ring 5. The seal lip 19 is elastically contacted with the outer surface of the rotation side core metal 12 so as to be in sliding contact with the outer ring 5 when the inner ring 5 is rotated. Similarly, the outer seal ring 17 includes a fixed side metal core 25, a seal lip 27, and a slinger 26.

  The rotation-side metal core 12 is made of a metal plate such as a rolled steel plate or a stainless steel plate, and is externally supported by the end portion of the inner ring (rotation-side member) 5. The cored bar 12 is also used as a slinger, as shown in FIG.

  The pulsar ring 10 of the present invention is composed of a rubber magnet body 11 and a steel plate core 12 that supports the rubber magnet body 11 so that the rubber magnet body 11 is bonded and integrated, and the rubber magnet body 11 is connected to the support end face portion 11a. It is characterized by being stuck so as to straddle the inwardly facing flange piece 12b and the outwardly facing flange piece 12a through a steel plate flat annular spacer member S.

  According to this, since the rubber magnet body 11 is adhered to the support end surface portion 11a via the steel plate flat annular spacer member S, the support end surface portion 11a is corrugated by the sheet metal processing of the core metal 12. Even if it exists, the rubber magnet body 11 is not directly affected, and the rotation detection surface 11b does not wave. Therefore, the flatness of the rubber magnet body 11 can be kept uniform, and the rotation detection accuracy and sensitivity can be improved.

FIG. 3 is a cross-sectional view of a main part showing a mounting state of the pulsar ring of the present invention. FIG. 4 is a perspective view showing an example of the pulsar ring of the present invention.
As shown in FIG. 3, the core metal 12 includes a double cylindrical portion 12 c that is bent so as to be folded by pressing a flat annular steel plate member (press molding), and the double cylindrical portion 12 c. It consists of a support end surface portion 11a (cross-sectional lateral T-shape) composed of an inwardly facing flange piece 12b and an outwardly facing flange piece 12a formed continuously at both ends of the antirefractive side. As described above, the cored bar 12 can be mass-produced at a low cost if it has a structure that can be processed by press molding, and the fitting fixing force is also enhanced by making the fitting cylinder 12c have a double structure.

  As shown in FIG. 3, a flat circular spacer member S made of a steel plate such as a rolled steel plate or a stainless steel plate is provided between the rubber magnet body 11 and the support end surface portion 11a made of the inwardly facing flange piece 12b and the outwardly facing flange piece 12a. Therefore, even if the support end surface portion 11a is corrugated due to the sheet metal processing of the core metal 12, the rubber magnet body 11 is not directly affected, and the rotation detection surface 11b can be prevented from corrugating. The specific shape of the spacer member S will be described later.

The double cylindrical portion 12c is a fitting cylinder 12c fitted and integrated with the rotation side of the bearing 9, and a wall H of the fitting cylinder 12c is formed with a through hole H penetrating inward and outward. It is sufficient that at least one through hole H is provided in the wall portion of the fitting cylinder 12c. The through holes H are appropriately formed. For example, a plurality of through holes H may be formed at equal intervals in the circumferential direction.
The through hole H is formed in this manner, and the spacer member S is interposed between the support end surface portion 11a and the rubber magnet body 11, thereby heating the rubber magnet body 11, the spacer member S, and the support end surface portion 11a. Even if gas is generated from the rubber itself of the rubber magnet body 11 due to heat in bonding (vulcanization bonding) and the gas is filled in the gap between the inward flange piece 120b and the outward flange piece 120a, the cored bar 12 Even if the treatment liquid remaining in the overlapping portion of the double cylindrical portion 12c during the degreasing treatment is gasified by heat during the sticking process of the rubber magnet body 11, it is quickly released from the through hole H, and Since the spacer member S guards the gas so as not to fill the rubber magnet body 11, it does not cause air blistering.

  The rubber magnet body 11 is attached to the support end face portion 11a so as to straddle the inwardly facing flange piece 12b and the outwardly facing flange piece 12a via a steel plate-like flat annular spacer member S, as shown in FIG. It is composed of magnetic rubber magnetized so that the S pole and the N pole are alternately arranged at equal intervals along the circumferential direction. The speed can be detected. In order to accurately detect the rotation speed, it is necessary that the S pole and the N pole are arranged at equal intervals with a precision higher than the reference, and the magnetic force of each pole must be greater than a predetermined strength. The magnetic rubber is obtained by kneading a magnetic powder in a rubber material. Examples of the magnetic powder used here include magnetic powder such as ferrite that is inexpensive and can maintain ferromagnetism.

  The rubber magnet body 11 may be attached to the spacer material S and the support end surface portion 11a only by an adhesive, but is preferably attached by heating adhesion (vulcanization adhesion). According to the present invention, the spacer member S is interposed between the support end surface portion 11a and the rubber magnet body 11 even if the support end surface portion 11a is wavy due to the sheet metal processing of the core metal 12, and the double cylinder. If the through-hole H is formed in the wall part 12c, even if gas is generated from the rubber itself of the rubber magnet body 11 due to heat at the time of heat bonding, the degreasing treatment liquid remaining in the cored bar 12 Even if the gas is gasified, the gas can be discharged to the outside without difficulty from the through-hole H. Therefore, the rubber magnet body 11 can be adhered more firmly by heat bonding (vulcanization bonding), and the rotation detection surface 11b The magnetic properties are not uneven due to undulations.

FIG. 5 is a cross-sectional view of the main part showing another attachment state of the pulsar ring of the present invention.
As apparent from FIG. 2, the rubber magnet body 11 portion of the pulsar ring 10 and the inward flange piece 12 b and the outward flange piece 12 a of the core metal 12 are fixedly arranged so as to make a pair with the magnetic sensor 24. There is a portion protruding from the bearing 9.
Here, although there is some disappearance due to the rotation of the wheel, there is a problem that the moisture received by the traveling of the vehicle or the moisture generated by the drive control of the internal combustion engine accumulates in the protruding portion when the shaft is connected.
Therefore, as shown in FIG. 5, if the support end surface portion 11a is located close to the vehicle body side from the inner end surface of the inner ring 5, and the through hole H is detached from the fitting portion of the fitting cylinder 12c, a double cylindrical portion is provided. Since the through-hole H formed in the wall portion 12c serves as a hole for removing moisture, it is possible to prevent moisture from accumulating in the protruding portion of the pulsar ring 10.

FIGS. 6A, 6B and 7A, 7B are plan views showing the shape of the flat annular spacer member of the present invention interposed between the rubber magnet body and the support end surface portion.
The flat annular spacer member S is made of a rolled steel plate, a stainless steel plate or the like, and is interposed between the rubber magnet body 11 and the support end surface portion 11a made of the inwardly facing flange piece 12b and the outwardly facing flange piece 12a as described above. Thus, the flatness of the rubber magnet body 11 is kept uniform to improve the rotation detection accuracy and sensitivity.

The shape of the spacer member S may be a flat circular shape having the same diameter as that of the support end surface portion 11a and may be integrated. However, the adhesion to the rubber magnet body 11 and the fixing force of the spacer member S itself are improved. In order to achieve this, it is desirable to provide a hole.
For example, as shown in FIG. 6A, a plurality of small holes H1 are formed at equal intervals in a circumferential row, or slit-shaped arc holes (H2, H3) are formed in the circumferential direction as shown in FIG. It may be provided. Further, as shown in FIGS. 7A and 7B, notched holes (H4 to H7) may be provided on the circumferences of the inner diameter portion S1 and the outer diameter portion S2 of the flat annular spacer member S. As shown in FIG. 7A, the notch-shaped holes (H4 to H7) may be such that the hole H4 provided in the inner diameter portion S1 and the hole H5 provided in the outer diameter portion S2 face each other. 7 (b), holes (H6, H7) may be alternately arranged.

Further, the diameters and shapes of the holes provided are not necessarily limited to the same one as shown in FIGS. 6 (a) and 7 (a). FIG. 6 (b) and FIG. Different things may be mixed as shown in FIG. In short, at the time of vulcanization bonding, the rubber itself or the adhesive of the rubber magnet body 11 may enter the hole portion, and a portion where the support end surface portion 11a and the rubber magnet body 11 are directly bonded may be provided. If comprised in this way, even if the spacer member S intervenes between the rubber magnet body 11 and the support end surface part 11a, the adhesive force of both (11, 11a) is the part of the rubber itself or the adhesive. Does not fall due to the anchor effect.
Of course, as described above, the spacer member S may have a diameter longer than the inner diameter of the support end surface portion 11a of the core metal and shorter than the outer diameter, without providing a hole.

Sectional view showing wheel bearing and surrounding structure Enlarged sectional view of the main part of the bearing Sectional drawing of the principal part which shows the attachment state of the pulsar ring of this invention The partial perspective view which shows an example of the pulsar ring of this invention Sectional drawing of the principal part which shows the attachment state of the pulsar ring of this invention (A) (b) The top view which shows the shape of the flat annular spacer member of this invention (A) (b) The top view which shows the shape of the flat annular spacer member of this invention Sectional view of the main part showing the mounting state of the conventional pulsar ring

Explanation of symbols

10 Pulsar ring
11 Rubber magnet body
11a Support end surface portion 11b Rotation detection surface 12 Core metal 12a Outward flange 12b Inward flange 12c Double cylindrical portion (fitting cylinder)
S Spacer member H Through hole 5 Rotation side member
9 Bearing 24 Magnetic sensor

Claims (6)

This is a pulsar ring consisting of a flat annular rubber magnet body in which a large number of S poles and N poles are alternately magnetized in the circumferential direction, and a steel plate core that supports the rubber magnet body in an integrated manner. And
The cored bar is formed by bending a flat annular steel plate member so as to be bent so as to be folded, and an inwardly extending piece formed at both ends of the anti-refractive side of the double cylindrical portion. And a supporting end surface portion made of an outwardly facing piece, the double cylindrical portion is a fitting tube fitted and integrated with the rotating side of the bearing, and the rubber magnet body is a steel plate with respect to the supporting end surface portion. A pulsar ring characterized by being attached so as to straddle an inwardly facing piece and an outwardly facing piece through a flat annular spacer member. In claim 1,
A pulsar ring characterized in that a through-hole penetrating inward and outward is formed in a wall portion of the fitting tube. In claim 1 or 2,
A pulsar ring, wherein a through hole is formed in the flat annular spacer member. In claim 1 or 2,
A pulsar ring characterized in that a cutout hole is formed in the flat annular spacer member. In any one of Claims 1 thru | or 4,
A pulsar ring, wherein the core metal also serves as a slinger for a bearing seal ring. In any one of Claims 1 thru | or 5,
The pulsar ring, wherein the rubber magnet body is attached to the support end face portion by vulcanization adhesion.

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