JP2005321330A - Sealing ring with tone wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing ring with a tone wheel capable of protecting the tone wheel, capable of maintaining magnetic detection precision, and capable of precluding the possibility of generating attaching mistake or the like. <P>SOLUTION: This sealing ring 7 is provided with the tone wheel 11 comprising a magnetic ring attached to a slinger 8 engagement-integrated with a rotation side member 3, and a nonmagnetic material-made cover body 12 for covering the tone wheel 11, and the tone wheel 11 is assembled in a bearing 2 to be faced to a magnetic sensor 13 provided in a fixing side. In the sealing ring 7, a face area 11a faced to the magnetic sensor 13 of the tone wheel 11 is brought into an exposed condition without being covered by the cover body 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal ring of a bearing provided with a tone wheel that constitutes a rotational speed detection device such as a wheel of an automobile, and more specifically, includes a magnetic ring attached to a slinger integrated with a rotation side member. The present invention relates to a seal ring that includes a tone wheel and a cover body that covers the tone wheel, and is incorporated in a bearing so that the tone wheel faces a magnetic sensor installed on a fixed side.

  Examples of the seal ring with a tone wheel (encoder) as described above include those disclosed in Patent Documents 1 and 2. In these patent documents, a magnetic ring in which S poles and N poles are alternately formed in the circumferential direction is attached to a slinger integrated with a rotation side member (an inner ring or an outer ring) of a bearing. It is disclosed that a magnetic sensor is installed so that the detection surface faces the tone wheel, the magnetic change of the tone wheel accompanying the rotation of the rotation side member is detected by the magnetic sensor, and the rotation speed is detected. An example of the bearing seal ring disclosed here is shown in FIG.

  FIG. 6 shows a main part of a structure in which the drive shaft 100 is rotatably supported by a ball bearing B whose inner ring is on the rotation side. The inner ring 101 is externally fitted to the drive shaft 100 and the fixed side (in the case of an automobile, the vehicle body) A rolling element (ball) 103 is interposed between the outer ring 102 and the outer ring 102 fixed to the outer ring 102, so that the inner ring 101 and the drive shaft 100 can rotate relative to the outer ring 102. The rolling element 103 is held at a predetermined position by the retainer 104, and a lubricant (not shown) such as grease is loaded on the peripheral portion of the rolling element 103 in order to maintain the smooth rolling. Between the inner ring 101 and the outer ring 102 at both ends in the axial direction (only one side is shown in the figure), a seal ring S is provided to allow mutual relative rotation and prevent leakage of the lubricant. Has been. The seal ring S is made of a slinger 105 fitted on the outer diameter surface of the inner ring 101, a core metal 106 fitted on the inner diameter surface of the outer ring 102, and a rubber which is fixed to the core metal 106 and elastically slidably contacts the slinger 105. It consists of a seal lip 107.

The slinger 105 includes a cylindrical portion 105a fitted on the inner ring 101 and a flange portion 105b extending outward from the cylindrical portion 105a. Magnetic powder is applied to the rubber material on the end surface of the flange portion 105b. A tone wheel 108 made of a magnetic ring, which is kneaded and alternately magnetized with S and N poles in the circumferential direction, is integrally attached. Further, a cover body 109 made of a nonmagnetic material is provided between the cylindrical portion 105a of the slinger 105 and the outer diameter surface of the inner ring 101, and is made of a nonmagnetic material that is closely extended to the outer end surface of the tone wheel 108. Yes. A magnetic sensor 110 is installed on the fixed side so as to face the surface of the tone wheel 108, and the magnetic sensor 110 and the tone wheel 108 constitute a rotation speed detection encoder of the drive shaft 100.
JP 2001-241435 A Japanese Patent No. 3453699

  In the bearing structure and the encoder structure as described above, the tone wheel 108 is covered with the cover body 109, so that the tone wheel 108 is not damaged, and the drive shaft to the adhesion part of the tone wheel 108 is provided. Since it does not receive rust and water attack from the 100 side and does not peel off, the rotation speed detection function is maintained for a long time. However, since the cover body 109 is interposed between the detection surface of the magnetic sensor 110 and the tone wheel 108, the air gap (the detection surface of the magnetic sensor 110 and the tone wheel 108 is equal to the thickness of the cover body 109. And a new problem that the magnetic detection accuracy is lowered due to this has been pointed out.

  Further, the cover body 109 and the slinger 105 are formed of the same quality stainless steel plate or SPCC steel plate. However, when the tone wheel 108 is covered with the cover body 109 as shown in the drawing, the tone wheel 108 is apparently attached. If the seal ring S is assembled and the bearing is assembled, the surface to which the tone wheel is attached becomes the inside (lubricant side) or the assembled bearing is rotated. And the fixed side on which the magnetic sensor is installed may cause a mounting error such that the surface on which the tone wheel is attached becomes the antimagnetic sensor side. In order to prevent such a mounting error, it is effective to paint the cover body 109, but the actual situation is that it has not been put into practical use because of the cost.

  The present invention has been made in view of the above circumstances, and provides a seal ring with a tone wheel that can protect the tone wheel, maintain magnetic detection accuracy, and cause no mounting errors. The purpose is that.

  A seal ring with a tone wheel according to the invention of claim 1 is a tone wheel composed of a magnetic ring attached to a slinger integrated with a rotation side member, and a cover body made of a non-magnetic material that covers the tone wheel. A seal ring incorporated in the bearing so that the tone wheel faces the magnetic sensor installed on the fixed side, and the surface area of the tone wheel facing the magnetic sensor is not covered by the cover body and is exposed It is characterized by being.

  The surface area of the tone wheel that faces the magnetic sensor is located at a position that is lowered to the slinger side from the surface of the surrounding cover body, as in the invention of claim 2, or as in the invention of claim 3. In some cases, it is formed so as to be flush with the surface of the surrounding cover body. These are appropriately selected and adopted according to the installation mode of the magnetic sensor.

  According to a fourth aspect of the present invention, the slinger comprises a cylindrical portion fitted to the rotation side member of the bearing, and a flange extending from one end of the cylindrical portion to the fixed side. It is characterized by being integrally attached to the outer surface of the buttocks. In this case, as in the invention of claim 5, the cover body is interposed between the cylindrical portion of the slinger and the rotation side member of the bearing and includes the extension corner portion of the flange portion so as to cover the tone wheel. The tone wheel is formed so as to bite the peripheral edge of the flange, and the cover body includes the biting portion so as to cover the tone wheel. It is desirable that

  According to the first aspect of the present invention, the surface area of the tone wheel facing the magnetic sensor is not covered with the cover body and is in an exposed state, and therefore the cover body is between the surface area and the detection surface of the magnetic sensor. Therefore, it is possible to maintain the magnetic detection accuracy by bringing the air gap as close as possible and reducing the air gap. Further, since the tone wheel is covered by the cover body, the tone wheel is not damaged and its detection function is maintained for a long time. Furthermore, since the surface area is exposed and found, it can be easily understood that the known side is a face to which a tone wheel is attached. Therefore, when the bearing is assembled by incorporating the seal ring of the present invention, the surface to which the tone wheel is attached is on the inner side (lubricant side), or the assembled bearing is installed on the rotation side and a magnetic sensor is installed. When mounting between the fixed side and the fixed side, it is possible to prevent a mounting error such that the surface on which the tone wheel is attached becomes the diamagnetic sensor side.

  If the surface area facing the magnetic sensor of the tone wheel is formed as in the invention of claim 2, even when the magnetic sensor is installed closer to the surface area than in the vertical direction, the detection surface is The air gap can be reduced as close as possible to the surface area. Further, when formed as in the invention of claim 3, even when the magnetic sensor is installed in parallel to the surface area, the air gap can be reduced by bringing the detection surface close to the surface area. .

  The slinger is configured as in the invention of claim 4 and, as in the invention of claim 5, the cover body is interposed between the cylindrical portion of the slinger and the rotating side member of the bearing, and the extension of the flange portion is provided. If it is formed so as to cover the tone wheel including the corner part, rust and water generated on the rotating side will not enter between the bonding surfaces of the tone wheel and the heel part, and the peeling of this part will be promoted. There is no. Further, as in the invention of claim 6, if the tone wheel is formed so as to bite the peripheral portion of the collar portion, and the cover body is formed so as to cover the tone wheel including the biting portion, the peripheral portion Water and rust are prevented from entering between the adhesion surfaces of the tone wheel and the heel portion, and the occurrence of peeling is suppressed as described above.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part of a structure in which a drive shaft is rotatably supported by a bearing that employs a seal ring with a tone wheel according to the present invention, and FIGS. FIGS. 3A, 3B and 3C are diagrams showing modifications of the Y portion of FIG. 1, FIG. 4 is a diagram showing another embodiment of the seal ring with a tone wheel of the present invention, FIGS. 5A and 5B are diagrams showing a modification of the main part of the embodiment.

  In FIG. 1, 1 is a drive shaft, and 2 is a ball (rolling) bearing that supports the drive shaft 1 so that the shaft can rotate. An inner ring (rotary member) 3 is fitted on the drive shaft 1, and a rolling element (ball) 5 is interposed between the outer ring 4 and a fixed side (vehicle body side in the case of an automobile). On the other hand, the inner ring 3 and the drive shaft 1 are rotatable. The rolling element 5 is held at a predetermined position by a retainer 6, and a lubricant (not shown) such as grease is loaded on the peripheral portion of the rolling element 5 in order to maintain the smooth rolling. A seal ring 7 is provided between the inner ring 3 and the outer ring 4 at both ends in the axial direction (only one side is shown in the figure) to prevent relative leakage of the lubricant and to prevent the lubricant from leaking out. Has been. The seal ring 7 is made of a slinger 8 fitted on the outer diameter surface of the inner ring 3, a core metal 9 fitted on the inner diameter surface of the outer ring 4, and a rubber that is fixed to the core metal 9 and elastically slidably contacts the slinger 8. It consists of a seal lip 10.

  The slinger 8 includes a cylindrical portion 8a fitted on the inner ring 3 and a flange portion 8b extending outward from the cylindrical portion 8a. The slinger 8 processes a nonmagnetic material such as a stainless steel plate or a SPCC steel plate. Obtained. A tone wheel 11 made of a magnetic ring in which a magnetic powder such as ferrite is kneaded with a rubber material and S poles and N poles are alternately formed in the circumferential direction is integrally attached to the end face of the flange 8b. The tone wheel 11 is formed so as to bite the peripheral edge portion of the flange portion 8b, and the pasting is integrally performed by adhesion or vulcanization adhesion. The surface of the tone wheel 11 is covered with a cover body 12 made of the same nonmagnetic material as described above, leaving a part. On the fixed side, a magnetic sensor 13 is installed so as to be close to the board surface of the tone wheel 11 from the vertical direction. The magnetic sensor 13 and the tone wheel 11 constitute a rotation speed detection encoder of the drive shaft 1. The

  The cover body 12 is composed of two members: a cylindrical body 12b having an outward flange portion 12a and a ring body 12c having a larger diameter than the outer peripheral portion of the outward flange portion 12a. The cylindrical body 12b is integrated with the outer diameter surface of the inner ring 3 by press fitting or bonding together with the cylindrical portion 8a of the slinger 8 so as to be interposed between the outer diameter surface of the inner ring 3 and the cylindrical portion 8a of the slinger 8. . Further, the ring body 12c is bonded and fixed so as to be caulked including the biting portion of the tone wheel 11. As described above, when the cover body 12 is integrally bonded, a space d is secured between the outer peripheral portion of the outward flange 12a and the inner peripheral portion of the ring body 12c. Therefore, in the interval d, the tone wheel 11 is not covered with the cover body 12 and is exposed to a surface area 11a that faces the detection surface 13a of the magnetic sensor 13, and this surface area 11a is the surface of the surrounding cover body 12. It is located at a position further lowered to the slinger 8 side.

  Since the surface area 11a is in an exposed state and is in a position recessed from the surface of the cover body 12, the magnetic sensor 13 is of a type installed so as to be close to the surface of the tone wheel 11 from the vertical direction. In some cases, the detection surface 13a can be as close as possible to the surface area 11a, and the air gap can be reduced to improve the accuracy of magnetic detection by the magnetic sensor 13. In addition, since the portion other than the surface area 11a is covered with the cover body 12, the tone wheel 11 is not damaged, its durability is improved, and the magnetic detection function is maintained for a long time.

  At the distance d, the surface area 11a of the tone hole 11 which is different from the cover body 12 is exposed and visually recognized, so that it can be easily determined that the tone hole 11 is attached. In particular, since the rubber material constituting the tone hole 11 has a blackish brown color, while the cover body 12 has a metallic luster, the difference is obvious. Very good.

  2A, 2B, and 2C show a modified example of the portion X in FIG. These show various deformation modes in which the outer peripheral side portion of the tone wheel 11 is covered by the cover body 12, and are appropriately selected and adopted in consideration of cost, processing man-hours, etc. and required durability. 3A, 3B, and 3C show a modification of the Y portion in FIG. Various deformation modes covered by the cover body 12 are shown, and are selected and adopted as appropriate in consideration of the cost, the number of processing steps, the required durability, and the like.

  In particular, the inner ring 3 side portion of the tone wheel 11 is susceptible to attack by rust and water generated by the drive shaft 1 due to centrifugal force. However, as in these examples, the extension of the flange 8b in the slinger 8 If it is completely concealed by the cover body 12 including the corner portion, rust and water do not enter the interface between the tone wheel 11 and the slinger 8, and peeling of the tone wheel 11 is suppressed. Since other configurations are the same as described above, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the example of FIG. 4, a portion corresponding to the same distance d in the cover body 12 of the tone wheel 11 is raised 11 b, and the exposed surface area 11 a is flush with the surrounding cover body 12. In the case of this example, as shown in the figure, the detection surface 13a is arranged close to the tone wheel 11 from the direction orthogonal to the axis of the drive shaft 1 (see FIG. 1), that is, along the surface of the cover body 12. Even in the case of the magnetic sensor 13, the air gap can be reduced as described above, and the accuracy of magnetic detection can be improved. Since other configurations and operations are the same as those described above, common portions are denoted by the same reference numerals and description thereof is omitted.

  5 (a) and 5 (b) show a modification of the same embodiment. FIG. 5 (a) shows a tone wheel 11 formed so that the cover body 12 is bitten by the outer edge portion of the flange portion 8b of the slinger 8. An example consisting only of the ring body 12c integrated so as to be crimped to the biting part, and (b) is an example where the cover body 12 is composed only of the cylindrical body 12b having the outward flange part 12a as described above. Show. In these examples, the thickness direction of the tone wheel 11 is formed in a stepped shape, the cover body 12 is processed into a shape corresponding to the stepped shape, and the surface area 11a similar to the above is flush with the surface of the cover body 12. It is made to become. Since other configurations and operations are the same as those described above, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the above embodiment, an example in which the inner ring 3 side is the rotation side has been described, but the outer ring 4 side may be the rotation side. Further, the present invention is not limited to the case where the drive shaft 1 is supported via the inner ring 3, and the ball 5 rolls on the outer periphery of the drive shaft 1 so that the slinger 8 is directly fitted on the drive shaft 1 and does not pass through the inner ring 3. A simple bearing structure may be used. Furthermore, it goes without saying that the modified example shown in FIG. 2 or 3 and the modified example shown in FIG.

It is principal part sectional drawing of the structure which supports a drive shaft so that shaft rotation is possible with the bearing by which the seal ring with a tone wheel of this invention was employ | adopted. (A) (b) (c) is a figure which shows the modification of the X section of FIG. (A) (b) (c) is a figure which shows the modification of the Y section of FIG. It is a figure which shows another Example of the seal ring with a tone wheel of this invention. (A) (b) is a figure which shows the modification of the principal part of the Example. It is principal part sectional drawing of the structure which supports a drive shaft so that shaft rotation is possible by the bearing which employ | adopted the conventional seal ring with a tone wheel.

Explanation of symbols

2 Bearing 3 Inner ring (Rotation side member)
7 Seal ring 8 Slinger 8a Slinger cylindrical part 8b Slinger collar 11 Tone wheel 11a Area facing the magnetic sensor 12 Cover body 13 Magnetic sensor

Claims (6)

A magnetic sensor comprising a tone wheel made of a magnetic ring attached to a slinger integrated with a rotation side member and a cover made of a non-magnetic material covering the tone wheel, the tone wheel being installed on the fixed side A seal ring built into the bearing to face
The surface area of the tone wheel facing the magnetic sensor is not covered with the cover body and is in an exposed state. The seal ring with a tone wheel according to claim 1,
A seal ring with a tone wheel, characterized in that a surface area facing the magnetic sensor of the tone wheel is located at a position lowering toward the slinger side than the surface of the surrounding cover body. The seal ring with a tone wheel according to claim 1,
A seal ring with a tone wheel, wherein a surface area facing the magnetic sensor of the tone wheel is formed to be flush with a surface of a surrounding cover body. In the seal ring with a tone wheel according to any one of claims 1 to 3,
The slinger includes a cylindrical portion that is fitted to the rotation side member of the bearing, and a flange portion that extends from one end of the cylindrical portion to the fixed side. The tone wheel is integrally attached to the outer surface of the flange portion. A seal ring with a tone wheel, characterized by In the seal ring with a tone wheel according to claim 4,
The cover body is interposed between the cylindrical portion of the slinger and the rotation-side member of the bearing, and is formed so as to cover the tone wheel including the extended corner portion of the flange portion. Seal ring. In the seal ring with a tone wheel according to claim 4,
A tone ring with a tone wheel, wherein the tone wheel is formed so as to bite a peripheral portion of the flange portion, and the cover body is formed so as to cover the tone wheel including the biting portion.

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