JP2007292513A - Rotational speed detection mechanism, rolling bearing equipped with same, and wheel support bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational speed detection mechanism, a rolling bearing equipped with the rotational speed detection mechanism, and a wheel support bearing unit which can reduce a parts count and shields a multipole magnet encoder from the outside of the bearing to protect it. <P>SOLUTION: The rotation support device comprises an inner ring 2, an outer ring 3, and a plurality of rolling elements 6 which are incorporated between the inner ring 2 and the outer ring 3. A magnetic signal from the circular multipole magnet encoder 1 provided on the inner ring 2 side of the rotation support device is read by a magnetic sensor S provided on the vehicle body side facing the multipole magnet encoder 1 to detect rotational speed. The multipole magnet encoder 1 is fixed to an inboard-side end face 2d of the inner ring 2 and is covered with a circular cover member 13 made of a nonmagnetic substance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotational speed detection mechanism that is provided in a rolling bearing that supports wheels of various vehicles and has a multipolar magnet encoder for detecting the rotational speed of the wheels by a magnetic sensor provided on the vehicle body side, and the rotational speed detection thereof. The present invention relates to a rolling bearing having a mechanism and a bearing unit for supporting a wheel. In this specification, the term “wheel” is used to collectively refer to all the wheels of a railway vehicle regardless of the wheels of an automobile.

For example, an automobile is provided with a rotation speed detection device that detects the rotation speed (wheel speed) of a wheel, and a multipolar magnet encoder disposed on the rotation side (wheel bearing side) and the multipolar magnet encoder are opposed to each other. As described above, there is known a magnetic sensor disposed on the vehicle body side. Such rotational speed detection devices are used in, for example, a traction control system (abbreviated as TCS), a car navigation system (Satellite navigation system), an anti-lock brake system (abbreviated as ABS), and the like. It's being used.
Conventionally, as a multi-pole magnet encoder, a rubber multi-pole magnet encoder formed in an annular shape as shown in FIG. 16 (for example, ferrite powder mixed with a rubber material as a binding material is magnetized, and S in the circumferential direction is formed. 1 is known), and the side facing the outside of the bearing in a reverse L-shaped seal member (for example, slinger) constituting a sealing device incorporated in a rolling bearing is known. The magnetic pole was integrally provided on the peripheral surface with the magnetic pole facing outward. In other words, there is a multipolar magnet encoder 1 that is provided in an exposed form outside the bearing.

When the rubber multi-pole magnet encoder 1 is arranged in an exposed manner outside the bearing, dust such as earth and sand, and iron scraps (magnetic dust) depending on the road surface condition, etc. It tends to adhere to the surface of the encoder 1 (the outer surface 1b facing outward from the bearing). In this way, there is a disadvantage that the surface of the multipolar magnet encoder is abraded due to the adhesion of foreign matter. If the surface of the multipolar magnet encoder 1 is worn, the magnetic flux density is lowered and the accuracy of the magnetic flux signal is lowered.
Further, when the magnetic dust adheres to the surface, there is a problem that the signal accuracy is lowered.
In order to eliminate such inconveniences, the periphery of the multipole magnet encoder 1 is designed so that the labyrinth is formed by taking in peripheral parts. The supplier of the sealing device or the rolling bearing incorporating the sealing device and the parts around the undercarriage are different. Therefore, the case where the matching of each design is bad and the performance of a labyrinth is not enough may occur.
Therefore, in recent years, for example, a technique disclosed in Patent Document 1 or 2 is provided as an example of a prior art that can prevent adhesion of dust in a rolling bearing with a multipole magnet encoder.

  For example, as shown in FIG. 14, Patent Document 1 raises a multipolar magnet encoder 1 integrally from the outer diameter of a rotating inner ring 2 in the radial direction and arranges the multipolar magnet encoder 1 inside a bearing. A seal member 100 integrally attached to the fixed outer ring 3 so as to shield the end region F between the inner and outer rings 2 and 3 from the outside of the bearing through a predetermined gap (air gap) G1; This is a technique for sensing by the magnetic sensor S from the outside of the seal member 100.

  For example, as shown in FIG. 15, Patent Document 2 discloses a cross-sectional view L that includes a cylindrical portion 50 and a disc portion 60 that is continuously raised in a circumferential direction from a bearing outer end portion of the cylindrical portion 50. The slinger 40 press-molded into a letter shape, the multipolar magnet encoder 1 integrally disposed on the outer surface 60a of the disk portion of the slinger 40, and the outer diameter 80a that can be fitted to the inner diameter 50a of the cylindrical portion of the slinger 40 The cross-sectional view is reversed, comprising a cylindrical portion 80 having an inner diameter that can be fitted to the outer diameter 2a of the inner ring 2 and a disc portion 90 that is continuously raised in the circumferential direction from the bearing outer end of the cylindrical portion 80. A technique is disclosed in which a cover member 70 press-molded into an L-shape and a surface (outer surface) 1 b of the encoder 1 facing the bearing outward is covered with the cover member 70. That is, the cylindrical portion 50 of the slinger 40 is fitted into the cylindrical portion 80 of the cover member 70, and the multipolar magnet encoder 1 is sandwiched between the disc portion 60 of the slinger 40 and the disc portion 90 of the cover member 70. With the cover set, the cylindrical portion inner diameter 80b of the cover member 70 is fitted to the inner ring outer diameter 2a and disposed in the bearing end region F.

However, in the technique disclosed in Patent Document 1, as shown in FIG. 14, between the multipolar magnet encoder 1 and the magnetic sensor S, 1) the axial gap between the multipolar magnet encoder 1 and the seal member 100 (Air gap) G1, 2) Thickness W of the seal member (core metal) 100, and 3) An axial gap (air gap) G2 between the seal member 100 and the magnetic sensor S exists.
Thus, since the distance (G1 + W + G2) from 1) to 3) is between the multipolar magnet encoder 1 and the magnetic sensor S, the magnetic signal becomes weak and the reliability of the magnetic signal accuracy is inferior.

Further, in the technique disclosed in Patent Document 2, the number of parts is increased by the amount of the cover member 70, and a technique with a high degree of processing difficulty is required in which the two pressed parts of the slinger 40 and the cover member 70 are fitted. It is expensive in terms of cost.
JP-A-10-160744 JP 2002-333033 A

  SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a rotational speed detection mechanism and a rotational speed detection mechanism that can protect the multipolar magnet encoder by shielding the outside of the bearing while suppressing the number of parts. The present invention provides a rolling bearing and a wheel supporting bearing unit.

  In order to achieve such an object, a first invention of the present invention includes a rotating member and a fixing member arranged concentrically, and a plurality of rolling elements incorporated between the rotating member and the fixing member. A rotation support device is configured, and a magnetic signal from an annular multipole magnet encoder provided on the rotation member side of the rotation support device is read by a magnetic sensor provided on the fixed member side facing the multipole magnet encoder. A rotation speed detection mechanism for detecting a rotation speed, wherein at least the rotation member is made of a magnetic material, and the multipolar magnet encoder is fixed to the outer surface of the rotation member by a magnetic force, and an annular cover made of a non-magnetic material The rotation speed detection mechanism is characterized in that it is covered with a member, and a magnetic sensor is opposed to the outside of the cover member to detect a magnetic signal.

  According to a second aspect of the present invention, in the first aspect, the multipolar magnet encoder is a rotational speed detection mechanism characterized in that a magnetic material is mixed with a magnetic powder, is formed into an annular shape, and is magnetized. It is.

  According to a third invention, in the second invention, the multipolar magnet encoder is a rotational speed detection mechanism characterized in that the inner surface of the cover member is vulcanized.

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the multipolar magnet encoder is a rotational speed detection mechanism characterized in that it is fixed to the inner surface of the cover member by adhesion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the housing portion of the multipole magnet encoder is recessed in the rotating member, the multipole magnet encoder is housed in the housing portion, and the cover member is covered. The rotational speed detection mechanism is characterized by the above.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the invention, the cover member is a rotational speed degree detection mechanism characterized in that the cover member is fixed to the rotary member by fitting.

  A seventh invention is composed of a rotating wheel, a fixed wheel, and a rolling element incorporated between the rotating wheel and the fixed wheel, and includes a multipolar magnet encoder on the rotating wheel side, and is provided near the rotating wheel. In a rolling bearing for detecting the rotational speed by a magnetic sensor, at least the rotating wheel is made of a magnetic material, and a multipolar magnet encoder is fixed to the outer surface end region of the rotating wheel and covered with an annular cover member made of a non-magnetic material. This is a rolling bearing characterized by the above.

  An eighth invention comprises a hub having one or more rows of raceway surfaces, and an inner ring fitted on the inboard side of the hub and having one or more rows of raceway surfaces adjacent to the raceway surfaces. Or a rotating member that is fitted on the outer periphery of the hub and includes an inner ring having a plurality of rows of raceway surfaces, and a plurality of rows of raceway surfaces facing the plurality of rows of raceway surfaces of the rotation members. A fixed member, a plurality of rolling elements incorporated between the raceway surface of the rotating member and the raceway surface of the fixed member, and a multipolar magnet encoder provided on the rotating member side, in the vicinity of the rotating member In a wheel support bearing unit that detects a rotational speed by a magnetic sensor provided, at least a rotating member is made of a magnetic material, and a multipolar magnet encoder is fixed to an outer surface end region of the rotating member, and an annular shape made of a nonmagnetic material. Hippopotamus Is that in which the wheel supporting bearing unit characterized by comprising coated with a member.

  According to a ninth aspect of the invention, in the wheel support bearing unit of the eighth aspect of the invention, the rotating member is provided with a flange to which the braking member and the wheel are fixed, and the fixing member is provided with a flange to be fixed to the vehicle body side. This is a wheel supporting bearing unit.

According to the present invention, the rotation wheel of the bearing is provided with a rotation speed detection mechanism and a rotation speed detection mechanism that can protect the multi-pole magnet encoder by shielding it from the outside of the bearing by suppressing the number of parts by using the back yoke. We were able to provide rolling bearings and wheel support bearing units.
Also, unlike the prior art shown in FIGS. 14 and 15, since the race is a strength member, the core of the encoder supports the encoder itself, or careless handling during the assembly process or stepping stones during running There is no need to provide strength for unexpected input such as a collision (the encoder functions as a cushion to cushion the impact).

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the present embodiment is merely an embodiment of the present invention, and is not construed as being limited thereto. The design can be changed within the scope of the present invention. In the present embodiment, the description will be made with a vehicle wheel support device as an example of the rotation support device, but other rotation support devices may be used. Moreover, although it demonstrates with the wheel of a motor vehicle as an example of a wheel, it is only an example and other wheels, such as a wheel of a railway vehicle, may be sufficient.
Examples 1 to 4 show an example in which the inner ring 2 is a rotating member, and Examples 5 to 6 show an example in which the outer ring 3 is a rotating member.
"Example 1"

  FIGS. 1 to 3 show a rolling bearing for supporting a wheel of an automobile as an example of a rotation support device, FIG. 1 is a schematic sectional view of the rolling bearing, and FIG. 2 is a vulcanization molding of a multipolar magnet encoder 1 on a cover member 13. FIG. 3 is an enlarged schematic view of the notched portion of FIG. 2 in a state where the outer surface side of the cover member 13 is partially cut away.

The rolling bearing (rotational support device) of the present embodiment includes an inner ring 2 as a rotating member, an outer ring 3 as a fixing member, and a raceway surface 2c provided on an outer diameter 2a of the inner ring 2 that are concentrically arranged to be relatively rotatable. And a plurality of rolling elements 6 incorporated through a cage 4 between the inner ring 3 and the raceway surface 3c provided on the inner diameter 3b of the outer ring 3, and provided on the inboard side of the inner ring 2, and on the fixed side (vehicle body side) The multi-pole magnet encoder 1 that constitutes the rotational speed detection mechanism together with the magnetic sensor S arranged in the above-described configuration.
In the present embodiment, at least the inner ring 2 is made of a magnetic material. For example, bearing steel and martensitic stainless steel are examples of the material. It does not prevent the outer ring 3 from being made of a nonmagnetic material.
Furthermore, when using the rotating wheel as a back yoke, residual magnetism should be considered. The raceway surface is usually processed with a magnet shoe type grinding machine. In this case, if the raceway ring is not sufficiently demagnetized, the magnetism remains, so that a zero shift of the encoder magnetic signal occurs and the NS ratio of the output signal is deteriorated (see FIG. 11). Therefore, it is necessary to demagnetize the raceway to a level where the error satisfies the required accuracy.

In this embodiment, a sealing device that is incorporated in the end region F of the inner ring 2 and the outer ring 3 and seals the annular bearing inner space between the inner and outer rings 2 and 3 is not shown. ) And outboard side (wheel side), lubricant (eg, grease, oil) enclosed in the bearing leaks to the outside of the bearing, or foreign matter (eg, water, dust) enters the inside of the bearing Well-known sealing devices that can prevent this, for example, contact seals and non-contact seals (including shields) are appropriately selected within the scope of the present invention. In addition, the design of the presence or absence of a metal core or a seal lip can be changed.
Further, a part of the cored bar part can be used as a sliding surface of the seal lip, or a part of the seal can be formed.
As described above, the rolling bearing of the present embodiment has a characteristic configuration in the multipolar magnet encoder 1 incorporated on the inboard side of the inner ring 2 and is otherwise well-known in other configurations. The multipolar magnet encoder 1 which is a specific configuration of the present invention will be specifically described, and the description of other configurations will be limited to the above-described degree.
Although not particularly illustrated, the present invention can also be applied to a double-row angular contact ball bearing or a double-row tapered roller bearing (first generation) in which the outer ring of the back combination bearing is integrated.

  As shown in FIG. 16, the multi-pole magnet encoder 1 is formed in an annular shape by being magnetized in multi-poles, and is formed in an end surface 2d on the inboard side of the inner ring 2 continuously cut out from the outer diameter 2a. 5 and is fitted and fixed so as to be sandwiched between the cover member 13.

  The cover member 13 is made of, for example, a nonmagnetic material such as austenitic stainless steel (SUS303 or the like), and has a width W1 between the inner and outer diameters that is the same as the depth D1 in the radial direction (the arrow Y direction in the drawing) of the housing portion 5. An annular disc portion 14 for vulcanizing and molding the multipolar magnet encoder 1 over the entire inner surface 14a, and a radial end portion (outer diameter side end portion) 14c of the disc portion 14 extending in the axial direction, The cylindrical portion 15 formed with an inner diameter that can be fitted to the diameter 2a is formed in a substantially inverted L shape in cross section.

The multipolar magnet encoder 1 is vulcanized and molded with a predetermined thickness into a disk shape in the same area as the inner surface 14a of the disk portion 14 with respect to the axial inner surface 14a of the disk portion 14 of the cover member 13. Yes. A radial end (inner diameter side end) 1 d of the multipolar magnet encoder 1 is formed on the same plane as a radial end (inner diameter side end) 14 d of the disc part 14.
The multipolar magnet encoder 1 is provided with the inner surface 1a side fixed to the housing portion 5 at the inboard side end surface 2d of the inner ring 2 and with its magnetic pole surface (outer surface 1b side) facing outward from the bearing. .

  The axial thickness W2 of the disc portion 14 in the cover member 13 is the total axial thickness when the multipolar magnet encoder 1 is vulcanized (the axial thickness W2 of the disc portion 14 and the multipolar magnet). When the thickness (W) combined with the axial thickness W3 of the encoder 1) is housed and fixed in the axial region of the housing 5 cut out in the inner ring end face 2d, the inner ring end face 2d and the disc By adjusting the outer surface 14b to the same plane or a thickness that is slightly retracted, it is possible to prevent interference with other parts and damage due to unintentional handling.

In this embodiment, since the multipolar magnet encoder 1 is integrally fixed to the disk portion 14 by vulcanization molding, the outer surface 14b of the disk portion 14 is vulcanized and magnetized. The multipole magnet encoder 1 is the same as the conventional structure shown in FIG.
The multipolar magnet encoder 1 can be fixed to the inner surface 14a of the disk portion 14 with an adhesive or the like after being separately molded and magnetized.
In this embodiment, the multipolar magnet encoder 1 is described as an example of a rubber multipole magnet encoder. However, a resin may be used as a binder of magnetic powder. The multipolar magnet encoder 1 can be appropriately selected according to the specifications.

  Since such a configuration is adopted, the multipole magnet encoder 1 is shielded by the cover member 13 made of a nonmagnetic material and protected so that the magnetic pole is not exposed to the outside of the bearing. Adherence of dust and the like to the outer surface 1b) is prevented.

  Moreover, according to the present Example, since the inner ring | wheel 2 is formed with the magnetic material, it has the function as a back yoke. Therefore, the multipolar magnet encoder 1 integrally formed on the inner surface 14a of the disc portion of the cover member 13 can be adsorbed without using an adhesive or the like if the inner surface 1a side is fitted into the housing portion 5 of the inner ring 2. To be fixed. Further, positioning of the fitting position of the multipolar magnet encoder 1 is reliable and easy, the number of parts can be reduced, and the cost is low.

Furthermore, in the case of the present embodiment, the multipolar magnet encoder 1 that is formed by deepening the radial depth W4 of the accommodating portion 5 formed on the inner ring end face 2d toward the inner diameter direction and attracted and fixed to the accommodating portion 5 is provided. If it is formed with a thick width in the radial direction, the central area of the magnetic flux is widened, and a highly accurate detection area (central area) becomes a wide area, so that reliability of detection accuracy can be obtained.
"Example 2"

FIG. 4 is a schematic sectional view showing Example 2 of the present invention.
In the case of the present embodiment, the inner ring end surface 2d on the inboard side is an example in which the inner ring end surface 2d is directly adsorbed by the magnetic force of the multipolar magnet encoder without providing the accommodating portion as in the first embodiment.
In addition, since the multipole magnet encoder 1, the cover member 13, and other configurations and operational effects are the same as those in the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted here.
In the present embodiment, the radial end (inner diameter side end) 14d of the disc portion 14 is formed in the same plane as the radial end (inner diameter side end) 1d of the multipolar magnet encoder 1. However, the radial end portion (inner diameter side end portion) 14c of the disk portion 14 may extend so as to cover the radial end portion (inner diameter side end portion) 1d of the multipolar magnet encoder 1.
"Example 3"

FIG. 5 is a schematic sectional view showing Example 3 of the present invention.
In the case of the present embodiment, this is an example in which the multipolar magnet encoder 1 is attracted to the inner ring outer diameter 2a by its magnetic force. In the case of the present embodiment, the cover member 13 cylindrical portion 15 is formed to have a larger diameter than the inner ring outer diameter 2a, and the multipolar magnet encoder 1 is integrally vulcanized and molded to the inner diameter 15b of the cylindrical portion 15, and its magnetic pole surface Is magnetized in an annular outer diameter 1c. Further, in the present embodiment, the outer surface 1b side of the multipolar magnet encoder 1 is covered with the disk portion 14 of the cover member 13 and shielded from the outside of the bearing. A radial end (inner diameter side end) 14d of the disc portion 14 is in contact with the inner ring outer diameter 2a.
Therefore, in the case of the present embodiment, the magnetic sensor S is located in the bearing end region F so as to face the magnetic pole surface (outer diameter 1c).
Since other configurations and operational effects are the same as those of the first embodiment, the same portions are denoted by the same reference numerals, and description thereof is omitted here.
Example 4

FIG. 6 is a schematic sectional view showing Example 4 of the present invention.
In the present embodiment, it has substantially the same form as in the third embodiment, but in this embodiment, the disc portion 14 of the cover member 13 covers and covers the end portion (outer surface) 1b of the multipolar magnet encoder 1 in the axial direction. However, it extends along the inner ring end face 2d. That is, this is an example of an implementation in which the disc portion 14 is in contact with the inner ring end face 2d to shield the multipolar magnet encoder 1 from the outside of the bearing.
Since other configurations and operational effects are the same as those in the first and third embodiments, the same portions are denoted by the same reference numerals, and description thereof is omitted here.
"Example 5"

FIG. 7 is a schematic sectional view showing Example 5 of the present invention.
In the case of this embodiment, unlike Embodiments 1 to 4 in which the inner ring 2 functions as a back yoke, the outer ring 3 is a rotating member and the outer ring 3 functions as a back yoke. The same applies to Examples 6 to 8 described later.

In the rolling bearing of this embodiment, the multipolar magnet encoder 1 is provided on the inboard side of the outer ring 3 as a rotating member, and constitutes a rotational speed detection mechanism together with the magnetic sensor S arranged on the fixed side (vehicle body side). ing.
In this embodiment, at least the outer ring 2 is made of a magnetic material. For example, bearing steel and martensitic stainless steel are examples of the material.

  As shown in FIG. 16, the multipolar magnet encoder 1 is magnetized in multiple poles and is formed in an annular shape, and is accommodated in an end surface 3 d on the inboard side of the outer ring 3 continuously cut out from the inner diameter 3 b. 5 and is fitted and fixed so as to be sandwiched between the cover member 13.

  The structure of the cover member 13 is made of a nonmagnetic material such as austenitic stainless steel (SUS303 or the like), for example, and has a width W1 between the inner and outer diameters that is the same as the depth D1 in the radial direction (the arrow Y direction in the figure) of the housing portion 5. An annular disc portion 14 for vulcanizing and molding the provided multipolar magnet encoder 1 over the entire inner surface 14a, and a radial end portion (inner diameter side end portion) 14d of the disc portion 14 extending in the axial direction, and an outer ring A cylindrical portion 15 formed to have an outer diameter that can be fitted to the inner diameter 3b is formed in a substantially inverted L shape in a sectional view.

The multipolar magnet encoder 1 is vulcanized and molded with a predetermined thickness into a disk shape in the same area as the inner surface 14a of the disk portion 14 with respect to the axial inner surface 14a of the disk portion 14 of the cover member 13. Yes. The radial end (outer diameter side end) 1c of the multipolar magnet encoder 1 is formed in the same plane as the radial end (outer diameter side end) 14c of the disc part 14.
The multipolar magnet encoder 1 is provided with the inner surface 1a side fixed to the accommodating portion 5 at the inboard side end surface 3d of the outer ring 3 and with its magnetic pole (outer surface 1b side) facing outward from the bearing.

The axial thickness W2 of the disc portion 14 in the cover member 13 is the total axial thickness when the multipolar magnet encoder 1 is vulcanized (the axial thickness W2 of the disc portion 14 and the multipolar magnet). When the axial thickness W3 of the encoder 1 is combined and secured in the axial region of the accommodating portion 5 cut out in the outer ring end surface 3d, the outer ring end surface 3d and the disc The thickness is adjusted so that the outer surface 14b is coplanar.
Other configurations and operational effects are the same as those of the first embodiment, and thus the description thereof is omitted here.
"Example 6"

FIG. 8 is a schematic sectional view showing Example 6 of the present invention.
In the case of the present embodiment, this is an example in which the outer ring end surface 3d on the inboard side is directly adsorbed by the magnetic force of the multipolar magnet encoder without providing the accommodating portion as in the fifth embodiment.
In addition, since the other structure and effect of the multipolar magnet encoder 1, the cover member 13, etc. are the same as that of Example 5, the same code | symbol is attached | subjected to the same location and description here is abbreviate | omitted.
Further, in this embodiment, the radial end (outer diameter side end) 14c of the disk portion 14 is formed on the same plane as the radial end (outer diameter side end) 1c of the multipolar magnet encoder 1. However, the radial end portion (outer diameter side end portion) 14c of the disk portion 14 extends so as to cover the radial end portion (outer diameter side end portion) 1c of the multipolar magnet encoder 1. Also good.
"Example 7"

FIG. 9 is a schematic sectional view showing Example 7 of the present invention.
In the case of the present embodiment, this is an example in which the multipolar magnet encoder 1 is attracted to the inner diameter 3b of the outer ring by its magnetic force. In the case of the present embodiment, the cylindrical portion 15 of the cover member 13 is formed to have a larger diameter than the outer ring inner diameter 3b, and the multipolar magnet encoder 1 is integrally vulcanized and molded to the outer diameter 15a of the cylindrical portion 15 to obtain the magnetic poles thereof. The surface is magnetized to an annular inner diameter (radial end) 1d. Further, in the present embodiment, the outer surface 1b side of the multipolar magnet encoder 1 is covered with the disk portion 14 of the cover member 13 and shielded from the outside of the bearing. A radial end portion (outer diameter side end portion) 14c of the disc portion 14 is in contact with the outer ring inner diameter 3b.
Therefore, in the case of the present embodiment, the magnetic sensor S is positioned in the bearing end region F so as to face the magnetic pole surface (inner diameter 1d).
Since other configurations and operational effects are the same as those of the fifth embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted here.
"Example 8"

FIG. 10 is a schematic sectional view showing Example 8 of the present invention.
In the case of this embodiment, it has substantially the same form as that of Embodiment 7, but in this embodiment, the disk portion 14 of the cover member 13 covers and covers the end portion (outer surface) 1b of the multipolar magnet encoder 1 in the axial direction. However, it extends along the outer ring end face 3d. That is, this is an example of an implementation in which the disc portion 14 is in contact with the outer ring end surface 3d to shield the multipolar magnet encoder 1 from the outside of the bearing.
Since other configurations and operational effects are the same as those of the fifth and seventh embodiments, the same portions are denoted by the same reference numerals and description thereof is omitted here.
"Example 9"

FIG. 12 is an example of the wheel support bearing unit of the present invention in which the multipolar magnet encoder of the present invention is incorporated. A broken line in the figure indicates a magnetic sensor S that is arranged on the fixed side (vehicle body side) toward the multipolar magnet encoder 1 and senses a magnetic signal of the multipolar magnet encoder 1.
The wheel support bearing unit of the present invention can be used for various vehicles such as automobiles and railroad vehicles, but here, as an example, the wheel support bearing is incorporated in a drive wheel of an automobile and uses an outer member as a rotating member. A description will be given assuming a unit. A wheel support bearing unit incorporated in the driven wheel is also a target.

As shown in FIG. 12, the wheel support bearing unit of the present embodiment includes an inner member 32 as a fixed member composed of inner rings 2, 2 having a row of raceway surfaces 2c, 2c, and the inner member. An outer member 33 as a rotating member having a plurality of rows of raceway surfaces 2c, 33c facing the plurality of rows of raceway surfaces 2c, 2c, and the raceway surfaces 2c, 2c of the inner member 32 and the outer member 33. A plurality of rolling elements (balls) 6 incorporated between the raceway surfaces 33c and 33c of the inner member 32 and the inner member 32 and the outer member 33 are provided with a sealing device M in the end region F on the inboard side. Incorporated.
The illustrated wheel support bearing unit of the present embodiment is a double-row angular contact ball bearing of a rear combination in which the outer member 33 is provided with a flange 33b on the outer periphery on the outboard side, and is also called a second generation (HUBII). .)).
Specifically, for example, the multipolar magnet encoder 1 disclosed in the first embodiment is fixed to the end region of the outer diameter 33 a on the inboard side of the outer member 33 via the cover member 13.
The multipolar magnet encoder 1 of the present embodiment is magnetized so that a magnetic pole is formed on its outer diameter (radial end) 1c. The cover member 13 includes a disc portion 14 having an inner diameter that can be fitted to the outer ring outer diameter 3a, and a cylindrical portion 15 extending in the axial direction from a radial end portion 14c of the disc portion 14. Yes.

Further, the wheel support bearing unit is not limited to the illustrated embodiment, and all units within the scope of the present invention including the first to third generations are applicable.
In addition, since it is as having demonstrated the Example 5 thru | or 8 about the effect of the multipolar magnet encoder 1 coat | covered with the cover member 13, description here is abbreviate | omitted.
In FIG. 12, an example in which the outer member 33 is a rotating member and the inner member 32 is a fixing member will be described. However, in FIG. 13, the outer member 33 is a fixing member and the inner member 32 is a rotating member. The combination form of the multipolar magnet encoder 1 and the cover member 13 of Example 2 shown in FIG. 4 is employed. In the illustrated example, a flange 33 b is provided on the outer periphery of the outer member 33 on the inboard side.
In this case, the forms disclosed in Examples 1 to 4 can be employed within the scope of the present invention.

It is a schematic sectional drawing which abbreviate | omits and shows Example 1 of this invention rolling bearing. It is a front view of the state where a part of the outer surface side of the cover member was cut away in a state where the multipolar magnet encoder was vulcanized and formed on the cover member. FIG. 3 is an enlarged schematic view of a notch portion in FIG. 2. It is a schematic sectional drawing which abbreviate | omits and shows Example 2 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 3 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 4 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 5 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 6 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 7 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 8 of this invention rolling bearing. It is a figure showing generation | occurrence | production of the zero shift of an encoder magnetic signal. It is a schematic sectional drawing which abbreviate | omits a part and Example 9 of this invention rolling bearing. It is a schematic sectional drawing which abbreviate | omits and shows Example 10 of this invention rolling bearing. It is a schematic sectional drawing of a prior art. It is a schematic sectional drawing of a prior art. It is the schematic of a multipole magnet encoder.

Explanation of symbols

1 Multipole magnet encoder 1b External surface (magnetic pole surface)
2 Rotating member (inner ring)
2d Inboard side end 3 Fixing member (outer ring)
13 Cover member S Magnetic sensor

Claims (9)

A rotating support device is constituted by a rotating member and a fixing member arranged in concentric circles, and a plurality of rolling elements incorporated between the rotating member and the fixing member,
A magnetic signal from an annular multipole magnet encoder provided on the rotating member side of the rotation support device,
A rotational speed detection mechanism that detects the rotational speed by reading with a magnetic sensor provided on the fixed member side facing the multipolar magnet encoder,
At least the rotating member is made of magnetic material,
The multipole magnet encoder is fixed to the outer surface of the rotating member by a magnetic force and is covered with an annular cover member made of a nonmagnetic material, and a magnetic sensor is opposed to the outside of the cover member to detect a magnetic signal. A rotational speed detection mechanism characterized by:   2. The rotational speed detection mechanism according to claim 1, wherein the multipolar magnet encoder is formed in a ring shape by mixing magnetic powder in a rubber material and magnetized.   The rotational speed detection mechanism according to claim 2, wherein the multipolar magnet encoder is vulcanized and molded on the inner surface of the cover member.   The rotational speed detection mechanism according to claim 1, wherein the multipolar magnet encoder is fixed to the inner surface of the cover member by adhesion.   5. The multipole magnet encoder housing portion is recessed in the rotating member, and the multipole magnet encoder is housed in the housing portion and covered with a cover member. Rotational speed detection mechanism.   The rotation speed degree detection mechanism according to claim 1, wherein the cover member is fixed to the rotation member by fitting. The rotating wheel is composed of a rotating wheel, a fixed wheel, and a rolling element incorporated between the rotating wheel and the fixed wheel. The multi-pole magnet encoder is provided on the rotating wheel side, and the rotation speed is measured by a magnetic sensor provided near the rotating wheel. In rolling bearings that detect
At least the rotating wheel is made of magnetic material,
A rolling bearing characterized in that a multipolar magnet encoder is fixed to an outer surface end region of a rotating wheel and is covered with an annular cover member made of a nonmagnetic material. A hub having one or more rows of raceway surfaces, and an inner ring fitted with the outer periphery of the hub on the inboard side and having one or more rows of raceway surfaces adjacent to the raceway surface, or a hub A rotating member configured with an inner ring having a plurality of rows of raceway surfaces,
A fixing member having a plurality of rows of raceways facing the rows of raceways of the rotating member;
A plurality of rolling elements incorporated between the raceway surface of the rotating member and the raceway surface of the fixed member;
A multi-pole magnet encoder provided on the rotating member side,
In the wheel support bearing unit for detecting the rotation speed by a magnetic sensor provided in the vicinity of the rotating member,
At least the rotating member is made of magnetic material,
A wheel support bearing unit comprising a multipolar magnet encoder fixed to an outer surface end region of the rotating member and covered with an annular cover member made of a nonmagnetic material. The rotating member includes a flange to which the braking member and the wheel are fixed,
The wheel support bearing unit according to claim 8, wherein the fixing member includes a flange fixed to the vehicle body side.

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