JP2005037131A - Pulser ring and sealing apparatus for detecting rotation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a surface to be detected in a multipolar magnet rotor from being damaged by foreign matters. <P>SOLUTION: A pulse ring for detecting rotation comprises a support ring attached to a rotary wheel; and the multipolar magnet rotor that has a surface to be detected, where magnetism is generated, and is attached to the support ring so that the surface to be detected opposes a magnetic sensor. A non-magnetic cover for covering the surface to be detected in the multipolar magnet rotor is provided. The cover is made of a covering body positioned on the surface to be detected in the multipolar magnet rotor, and a retaining body made of an elastic material for retaining the covering body. The retaining body is fitted to the support ring side by elastic force. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulsar ring and a sealing device including the pulsar ring.
[0002]
[Prior art]
A seal device used for sealing the inside of a rolling bearing device that supports an axle of a vehicle incorporates a pulsar ring that constitutes a rotation detection device that detects a rotation state of a wheel or the like (see, for example, Patent Document 1). ). The seal device includes a first seal ring fixed to an outer ring that is non-rotatably attached to the vehicle body side, and a second seal ring fixed to an inner ring that rotates together with the axle, and the second seal ring has a multipolar magnet rotor. Are bonded.
[0003]
The multipolar magnet rotor constituting the pulsar ring is magnetized so that N poles and S poles are alternately arranged in the circumferential direction so as to generate magnetism corresponding to the rotation. And the rotation state of the multi-pole magnet rotor rotating with the inner ring is detected in a non-contact manner by a magnetic sensor attached to the outer ring side.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-255337
[Problems to be solved by the invention]
In the sealing device incorporating the pulsar ring as described above, since the detection surface of the multipolar magnet rotor is exposed to the outside of the sealing device, foreign matter such as pebbles and gravel on the road, etc. The structure easily touches the detected surface of the multipolar magnet rotor, and the detected surface may be damaged by being caught between the magnetic sensor and the multipolar magnet rotor.
[0006]
[Means for Solving the Problems]
The pulsar ring for rotation detection according to the present invention includes a support ring attached to the rotating wheel and a detection surface that generates magnetism, and a multipole attached to the support ring so that the detection surface faces the magnetic sensor. A rotation detecting pulsar ring provided with a magnet rotor includes a nonmagnetic cover that covers a detected surface of the multipolar magnet rotor, and the cover is positioned on the detected surface of the multipolar magnet rotor; and The above-described problems are solved by configuring the holding body made of an elastic material for holding the cover body and fitting the holding body to the support ring side by an elastic force.
[0007]
Fitting the holding body of the cover to the support ring side includes the case where the holding body is directly attached to the support ring and the case where it is indirectly attached via a multipolar magnet rotor or the like. Moreover, in the above, as a support ring attached to a rotary wheel, the seal ring attached to the rotary wheel side in a sealing apparatus may be used, and you may comprise by a member different from a seal ring.
[0008]
According to the present invention, since the detection surface of the multipolar magnet rotor is covered with the cover cover, foreign matter such as pebbles does not directly contact the detection surface of the multipolar magnet rotor, and Even if a foreign object enters the gap between the magnetic sensor and the detection surface of the multipolar magnet rotor and bites into it, the cover body protects the detection surface of the multipolar magnet rotor, The detection surface is not damaged. As a result, the magnetic field lines can be accurately generated from the multipolar magnet rotor in response to the rotation, and the rotation detection accuracy in the rotation detection device configured with the magnetic sensor can be effectively maintained.
[0009]
As an embodiment of the present invention, the detected surface is formed in an annular shape in which different polarities are alternately arranged in the circumferential direction, the cover is formed in an annular shape corresponding to the detected surface, and the holding body is A magnetic material and a fixed portion fixed to the outer peripheral portion of the cover, and a fitting portion that extends from the fixed portion and fits to the support ring side by using its elasticity. Is preferred. In such a case, the cover can be easily and quickly mounted using the elastic force of the holding body.
[0010]
In the sealing device of the present invention, the first seal ring is fixed to the non-rotating wheel, the second seal ring is fixed to the rotating wheel, the seal lip provided in at least one of the seal rings is brought into contact with the other seal ring, In a sealing device provided with a pulsar ring that is detected in a non-contact manner by a magnetic sensor attached to the non-rotating wheel side, the pulsar ring includes a support ring attached to the rotating wheel, and a detection surface that generates magnetism. A multipolar magnet rotor attached to the support ring and a non-magnetic cover that covers the detected surface of the multipolar magnet rotor so that the detection surface faces the magnetic sensor, and the cover is configured as a multipolar magnet rotor. A cover body located on the surface to be detected and a holding body made of an elastic material for holding the cover body, and the holding body is fitted to the support ring side by elastic force A.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A sealing device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an enlarged cross-sectional view of a main part of a rolling bearing provided with the sealing device, and FIG. 2 is a perspective view including a partially broken metal ring of a first seal ring and a multipolar magnet rotor provided in the sealing device of FIG. 3 is a perspective view including a partially broken view showing a disassembled state of the metal ring of the first seal ring and the multipolar magnet rotor provided in the sealing device of FIG.
[0012]
In FIG. 1, a rolling bearing 1 includes an outer ring 2 as a non-rotating wheel, an inner ring 3 as a rotating wheel, a plurality of ball arrays 4, and a seal device 5.
[0013]
The seal device 5 includes first and second seal rings 10 and 20 and a pulsar ring 31 is incorporated therein.
[0014]
The first seal ring 10 has a configuration in which main, auxiliary, and side seal lips 14 a, 14 b, and 14 c are attached to a metal ring 13. The metal ring 13 is made of a nonmagnetic metal plate such as nonmagnetic stainless steel of JIS standard SUS304. The metal ring 13 of the first seal ring 10 includes a cylindrical portion 13a along the axial direction and an annular plate portion 13b extending radially inward from one axial end of the cylindrical portion 13a. The first seal ring 10 is fixed to the inner peripheral surface of the outer ring 2 by pressing the cylindrical portion 13a into the inner peripheral surface of the outer ring 2 along the axial direction.
[0015]
Unlike the first seal ring 10, the second seal ring 20 is composed of only a metal ring, and is made of a non-magnetic metal plate such as non-magnetic stainless steel of JIS standard SUS304. The second seal ring 20 includes an axial cylindrical portion 21 on the outer peripheral surface of which the main seal lip 14a and the auxiliary seal lip 14b of the first seal ring 10 are in contact. The cylindrical portion 21 is fitted to the outer peripheral surface of the inner ring 3 and functions as a support ring body.
[0016]
The second seal ring 20 includes an annular plate portion 22 that extends in the radial direction from the other axial direction of the cylindrical portion 21. The annular plate portion 22 contacts the inner seal surface with the side seal lip 14c of the first seal ring 10 and functions as an attachment portion for attaching the multipolar magnet rotor 33.
[0017]
A multipolar magnet rotor 33 is bonded to the outer surface of the annular plate portion 22 of the second seal ring 20. The multipolar magnet rotor 33 has a fitting cylinder portion 33b that fits to the outer peripheral portion of the annular plate portion 22, and the side surface of the multipolar magnet rotor 33 is an annular detected surface (magnetized magnet surface) 33a. For example, it is magnetized so that N poles and S poles are alternately arranged in the circumferential direction on the basis of rubber or resin containing magnetic powder. The second seal ring 20 constitutes a seal device that seals the inside of the rolling bearing device together with the first seal ring 10, and serves as a support ring that supports the multipolar magnet rotor 33.
[0018]
A cover 40 is attached to the annular seal 22 side of the second seal ring 20 to cover the detected surface 33a of the multipolar magnet rotor 33 and protect the detected surface 33a from foreign matter. The cover 40 includes a cover body 41 and a holding body 43.
[0019]
The cover body 41 is, for example, an annular plate formed of a nonmagnetic material such as a nonmagnetic stainless steel of JIS standard SUS304, a metal such as aluminum, or a synthetic resin. The cover 41 is located on the detected surface 33a of the multipolar magnet rotor 33 so as to cover the entire detected surface 33a of the multipolar magnet rotor 33. Specifically, as shown in FIG. 1, the outer diameter D1 of the cover body 41 is set equal to or larger than the outer diameter d1 of the multipolar magnet rotor 33. Further, the inner diameter D2 of the inner peripheral end surface of the cover body 41 is set equal to or smaller than the inner diameter d2 of the multipolar magnet rotor 33.
[0020]
In the present embodiment, the outer diameter D1 of the cover body 41 is larger than the outer diameter d1 of the multipolar magnet rotor 33, and the inner diameter D2 of the inner peripheral end surface of the cover body 41 is larger than the inner diameter d2 of the multipolar magnet rotor 33. Also, the inner peripheral end of the cover 41 protrudes beyond the inner peripheral end of the multipolar magnet rotor 33. Thus, by covering the inner peripheral end portion of the cover body 41 from the inner peripheral end portion of the multipolar magnet rotor 33, the entire detected surface 33 a of the multipolar magnet rotor 33 is completely covered with the cover body 41. can do. The inner surface 43 c of the cover body 41 is preferably in close contact with the detected surface 33 a of the multipolar magnet rotor 33.
[0021]
The holding body 43 is formed in a cylindrical shape from a nonmagnetic elastic material such as rubber or synthetic resin so as to hold the cover body 41 in a predetermined position. When the holding body 43 is made of rubber, it can be integrally bonded to the outer peripheral portion of the cover body 41 by vulcanization molding. The holding body 43 includes a fixing portion 43a that is fixed to the outer peripheral portion of the cover body 41, and a fitting portion 43b that extends from the fixing portion 43a. The inner peripheral diameter D3 of the fitting portion 43b before fitting is set slightly smaller than the outer diameter d1 of the multipolar magnet rotor 33 that becomes the fitted portion. The reason why the inner peripheral diameter D3 of the holding body 43 is set to be slightly smaller than the outer diameter d1 of the multipolar magnet rotor 33 in this way is that when the holding body 43 is fitted on the outer peripheral surface of the multipolar magnet rotor 33. This is because the cover 40 is prevented from being detached and separated by the frictional force generated by the elastic deformation and the elastic force.
[0022]
The magnetic sensor 30 is a sensor that detects magnetism, and includes, for example, a Hall element, a Hall IC, a magnetoresistive element, and the like. Molded with the body 35. The outer package 35 is arranged on the fixed outer ring 2 side so that the magnetic sensor 30 faces the multipolar magnet rotor 33 in a non-contact manner in the axial direction and the lead wire 30a from the magnetic sensor 30 can be connected to an electronic circuit (not shown). Supported as appropriate.
[0023]
The second seal ring 20, the multipolar magnet rotor 33 and the cover 40 constitute a pulsar ring 31, and the pulsar ring 31 and the magnetic sensor 30 constitute a rotation detection device that detects the rotational state of the inner ring 3. Examples of the rotation state include a rotation phase, a rotation speed, a rotation speed, and a rotation direction.
[0024]
In such a rolling bearing 1, when the inner ring 3 rotates, the multipolar magnet rotor 33 rotates with the inner ring 3. The multipolar magnet rotor 33 generates magnetic lines of force corresponding to the rotation to the magnetic sensor 30. The magnetic sensor 30 outputs a detection output corresponding to the rotation state of the multipolar magnet rotor 33 based on the magnetic field lines. In such rotation detection, even if the detected surface 33a of the multipolar magnet rotor 33 is covered with the cover 40, the cover 40 is constituted by the nonmagnetic material cover 41 and the nonmagnetic material holder 43. Therefore, the magnetic sensor 30 can detect the magnetic lines of force generated from the multipolar magnet rotor 33.
[0025]
Further, since the detection surface 33a of the multipolar magnet rotor 33 is covered by the cover 40, the cover 40 prevents foreign matter from directly contacting the detection surface 33a of the multipolar magnet rotor 33. There is no possibility that the detected surface 33a of the multipolar magnet rotor 33 is damaged by the foreign matter.
[0026]
Since the cover 40 is in close contact with the detected surface 33a of the multipolar magnet rotor 33, foreign matter can be prevented from entering between the detected surface 33a of the multipolar magnet rotor 33 and the cover 40. Magnetic field lines corresponding to the rotation are generated accurately from the multipolar magnet rotor 33, and the rotation state can be detected with high accuracy by the magnetic sensor 30.
[0027]
Further, since the entire circumference of the holding body 43 of the cover 40 presses the multipolar magnet rotor 33 radially inward, there is no possibility that the cover 40 is inadvertently separated during rotation.
[0028]
When the cover 40 is mounted, when the cover 40 is pushed into the second seal ring 20, the holding body 43 is elastically deformed against the elastic force and is pressed against the outer peripheral surface of the multipolar magnet rotor 33. Thus, the cover 40 can be easily and quickly attached.
[0029]
In addition, since the second seal ring 20 serves as both the first seal ring 10 and the member constituting the seal device that seals the inside of the rolling bearing device and the member that supports the multipolar magnet rotor 33, the number of parts is reduced. Reduction can be achieved.
[0030]
A sealing device according to an embodiment of the present invention will be described with reference to FIG. This sealing device is incorporated in a rolling bearing device for supporting wheels that are drive wheels. In FIG. 4, the left side shows the vehicle outer side, and the right side shows the vehicle inner side. The rolling bearing device 61 includes an outer ring 62, a hub shaft 32, an inner ring 63, a plurality of ball rows 44, 44, a first cage 6a on the vehicle outer side, and a second cage 6b on the vehicle inner side. It has.
[0031]
The outer ring 62 is capable of rotating the hub shaft 32 and the inner ring 63 around the axis O via the two rows of ball rows 44 and 44 with two rows of crown-shaped cages 6a and 6b, respectively. I support it. The outer ring 62 is non-rotatably fixed to the vehicle body by fixing a radially outward flange 62a to the knuckle 9 of the vehicle body with a bolt 8.
[0032]
The hub shaft 32 includes a flange 32a projecting radially outward on the outer side of the vehicle outer side, and a brake disc rotor and wheels (not shown) are attached to the flange 32a. The hub shaft 32 includes a central hole that is penetrated in the axial direction and has a female spline formed on the inner periphery. A shaft portion 40 integrally formed with a hook-shaped outer ring 39 of a constant velocity joint is inserted into the center hole of the hub shaft 32 and is spline-fitted, and a nut is attached to the end of the shaft portion 40. 41 is screwed together so that the outer ring 39 of the constant velocity joint and the hub shaft 32 are integrated.
[0033]
The inner ring 63 is attached to the outer peripheral surface of the hub shaft 32 on the vehicle inner side, and is fixed to the hub shaft 32 by caulking the end portion of the hub shaft 32 on the vehicle inner side.
[0034]
The annular space between the outer ring 62 and the inner ring 63 is sealed by seal devices 5 and 38 mounted on the vehicle outer side and the vehicle inner side, respectively.
[0035]
The sealing device 5 on the vehicle inner side is the sealing device shown in FIGS. The first seal ring 10 and the second seal ring 20 of the seal device 5 are inserted between the outer ring 62 and the inner ring 63 in a state where they are combined in advance and integrated. The metal ring 13 of the first seal ring 10 of the seal device 5 is fixed to the outer ring 62, and the cylindrical portion 21 of the second seal ring 20 is fixed to the inner ring 63.
[0036]
When such a seal device 5 is used, when the shaft portion 40 of the constant velocity joint rotates, the multipolar magnet rotor 33 rotates together with the inner ring 63 around the axis O, so that the outer body 35 is disposed on the outer ring 62 side (vehicle body). The magnetic sensor 30 fixed via the wheel can reliably detect the rotational state of the wheel. The magnetic sensor 30 may be directly attached to the outer ring 62.
[0037]
The sealing device shown in FIG. 5 is a radial type in which a multipolar magnet rotor 33 and a magnetic sensor 30 are arranged in the diameter direction. Specifically, the second seal ring 20 includes a cylindrical portion 21, an annular plate portion 26 extending radially outward from the cylindrical portion 21, and a cylindrical portion 27 extending substantially horizontally from the annular plate portion 26 in one axial direction. It is composed of
[0038]
The multipolar magnet rotor 33 is formed in a cylindrical shape and bonded to the outer peripheral surface of the cylindrical portion 27 of the second seal ring 20. The cover 40 includes a cover body 41 and a holding body 43 as in the above embodiment, but the cover body 41 is formed in a cylindrical shape. Moreover, the holding bodies 43 are provided on both sides of the cover body 41, and each holding body 43 of the cover 40 is fitted to both ends of the cylindrical portion 27 of the second seal ring 20.
[0039]
In this embodiment, the detection surface 33a of the multipolar magnet rotor 33 can be covered and protected by the cover 40, and both the holding bodies 43 hold the covering body 41 so as not to move in the axial direction. It is not necessary to press 41 to the detected surface 33a of the multipolar magnet rotor 33 more than necessary, and the detected surface 33a of the multipolar magnet rotor 33 is not damaged by the cover 41.
[0040]
In the sealing device 5 shown in FIG. 6, a pulsar ring 31 is attached separately from the sealing device 5. Specifically, the pulsar ring 31 is formed separately from the second seal ring 20, and a multipolar magnet rotor 33 is bonded to the support ring 50. The support ring 50 includes a cylindrical portion 51 that is fitted and fixed to the inner ring 3, and an annular plate portion 53 that extends radially outward from the cylindrical portion 51. The multipolar magnet rotor 33 is bonded to the annular plate portion 53 and is covered and protected by the cover 40. Since the cover 40 has the same configuration as that shown in FIGS. 1 to 3, the description thereof is omitted.
[0041]
Since this embodiment has a configuration in which the pulsar ring 31 is attached separately from the seal device 5, the pulsar ring 31 is independent of the seal device 5 side, and the support ring 50 and the multipolar electrode according to the attachment position and space. There is an advantage that the size and shape of the magnet rotor 33 can be arbitrarily set.
[0042]
A sealing device according to still another embodiment of the present invention will be described with reference to FIG. 7. This sealing device is incorporated in a rolling bearing device used on the driven wheel side of an automobile, for example. In this rolling bearing device, the inner ring 3 is a non-rotating ring (fixed ring) and the outer ring 2 is a rotating ring. The pulsar ring 31 is attached to the outer ring 2 side. The support ring 50 constituting the pulsar ring 31 includes a cylindrical portion 51 that is fitted and fixed to the inner end portion of the outer ring 2, and an annular plate portion 53 that extends radially inward from the cylindrical portion 51.
[0043]
The multipolar magnet rotor 33 is bonded to the annular plate portion 53 and covered with the cover 40. The cover 40 is obtained by fixing a holding body 43 to the inner periphery of the cover body 41. The pulsar ring 31 is positioned in the axial direction of the support ring 50 by bringing the annular plate portion 53 into contact with the end face of the outer ring 2.
[0044]
In the embodiment shown in FIG. 8, a radially inward annular small protrusion 43 c is provided on the periphery of the tip of the holding body 43 of the cover 40. The annular small protrusion 43c is engaged with the back surface side of the fitting cylinder portion 33b of the multipolar magnet rotor 33, and further prevents the cover 40 from moving in the separating direction. Can be installed. When the cover 40 of the present embodiment is mounted, when the cover 40 is pushed in the same manner as described above, the annular small protrusion 43c is also elastically deformed, so that the cover 40 can be mounted. Return by elastic force.
[0045]
The present invention is not limited to the above-described embodiments. For example, the cover 40 can be mounted on the support ring (second seal ring 20) side by the holding body 43, but the cover body 41 is further attached to the multipolar magnet rotor 33. It is also possible to bond. In addition, the object of use of the pulsar ring, seal device and bearing device of the present invention is not particularly limited.
[0046]
【The invention's effect】
In the present invention, since the multi-pole magnet rotor is covered with the cover, there is no possibility that foreign matter may damage the detected surface of the magnetized ring, and the detection accuracy of the magnetic sensor can be prevented from being lowered, so that stable detection is possible. Yes.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a rolling bearing including a sealing device according to an embodiment of the present invention. FIG. 2 is a perspective view including a partially broken metal ring and a multipolar magnet rotor of the first seal ring. 3] Perspective view including a partially broken view showing a disassembled state of the metal ring and the multi-pole magnet rotor of the first seal ring. [FIG. 4] A cross-sectional view of a rolling bearing device incorporating the seal device according to the embodiment of the present invention. 5 shows another embodiment of the present invention and corresponds to FIG. 1. FIG. 6 shows still another embodiment of the present invention, and corresponds to FIG. 1. FIG. 7 is still another embodiment of the present invention. FIG. 8 shows the embodiment and corresponds to FIG. 1. FIG. 8 is a cross-sectional view of the main part showing still another embodiment of the present invention.
2 Outer ring 3 Inner ring 5 Sealing device 10 First seal ring 20 Second seal ring 30 Magnetic sensor 31 Pulsar ring 33 Multipolar magnet rotor 33a Detected surface 40 Cover 41 Cover body 43 Holding body

Claims (3)

A support ring that is attached to the rotating wheel so as to be integrally rotatable, and a multipolar magnet rotor that is provided with a detection surface that generates magnetism and that is to be opposed to the magnetic sensor at a position where the detection surface faces the magnetic sensor. In pulsar ring for rotation detection,
A cover is provided so as to cover the detection surface of the multipolar magnet rotor, and the cover is positioned on the detection surface of the multipolar magnet rotor and covers the detection surface, and the cover A pulsar ring in which the holding body is fitted to the support ring side using its elastic force. While forming the detected surface in an annular shape in which different polarities are alternately arranged in the circumferential direction, forming the cover in an annular shape corresponding to the detected surface, and configuring the holding body with a non-magnetic material, And the pulsar ring comprised to the fixing | fixed part fixed to the outer peripheral part of the said cover body, and the fitting part extended from the said fixing | fixed part and fitting with the said support ring side using the elasticity. The first seal ring is fixed to the non-rotating wheel, the second seal ring is fixed to the rotating wheel, the seal lip provided on at least one of the seal rings is brought into contact with the other seal ring, and is attached to the non-rotating wheel side. In a sealing device provided with a pulsar ring that is detected in a non-contact manner by a magnetic sensor,
The pulsar ring includes a support ring attached to a rotating wheel, a multipole magnet rotor attached to the support ring so as to have a detection surface that generates magnetism, and the detection surface facing the magnetic sensor; A cover that covers the detection surface of the polar magnet rotor, and the cover is positioned on the detection surface of the multipolar magnet rotor so as to cover the detection surface; and A sealing device comprising an elastic holding body held in position, and fitting the holding body to the support ring side using its elastic force.

Images