JP2019108971A - Protective cover having sensor holder part, and bearing device having protective cover - Google Patents

Abstract

To provide a protective cover having a sensor holder part that can eliminate post-processing to scrape and flatten a bearing surface against which a magnetic sensor abuts after insert molding.SOLUTION: A protective cover is composed of a fiber-reinforced synthetic resin body 1A and a metal ring body 1B integrated by the insert molding. The body 1A comprises: a disc part 2; a sensor holder part 4 having a formed sensor attachment hole 4A for holding a magnetic sensor; and a partition wall 5 which is a thinner wall thinner than other parts. A distance R1 (mm) from the rotary shaft center of a radial direction maximum position D of an inner wall which forms the sensor attachment hole 4A of the body 1A is R1≥R2-0.6 with respect to a distance R2 (mm) from the rotary shaft center of an inner peripheral surface 6A of a first cylindrical part 6 which is outside part of the ring body 1B. In the ring body 1B, an axial position F of the inner side end of a second cylindrical part 7 connected to the inward end of the first cylindrical part 6 and located on the radial direction outside of the radial direction maximum position D, is located on the inner side of the axial direction center position of the disc part 2.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cup-shaped protective cover which is press-fit into an outer ring of a bearing and covers a magnetic encoder, and more particularly to a protective cover having a sensor holder portion for holding a magnetic sensor facing the magnetic encoder.

An anti-lock brake system widely used in automobiles that eliminates wheel lock and brakes efficiently and safely, for example, detects the rotational speed of each wheel by a rotational speed detection device (wheel speed sensor), and The acceleration and the deceleration are calculated, the vehicle speed and the slip ratio are estimated, and the actuator is driven based on the result to control the brake fluid pressure.
A bearing device having such a rotational speed detection device mounted on a rolling bearing (hub bearing) for supporting a wheel of an automobile is also widely used, and a magnetic encoder in which N poles and S poles are alternately arranged circumferentially at regular intervals. Are attached to the inner ring at one end of the bearing in the axial direction, and the protective cover is attached to the outer ring at one end of the axial direction of the bearing for sealing (see, for example, Patent Documents 1 to 3).

The protective cover of the invention described in patent documents 1 to 3 (code 1 of patent document 1, bearing cap 8b of patent document 2, bearing cap 33 of patent document 3) has a fiber having a sensor holder portion for holding a magnetic sensor. A main body made of reinforced synthetic resin (disk-like member 3 of Patent Document 1, cap main body 9b of Patent Document 2, cap main body 34 of Patent Document 3) and a cylindrical portion (code 37 of Patent Document 2; code 43 of Patent Document 3) Metal ring made of steel plate consisting of an outward flange part (code 38 of patent 2 and code 44 of patent 3) (cylindrical member 2 of patent 1, code 10 b of patent 2, code 35 of patent 3) ).
The sensor mounting hole for holding the magnetic sensor (code 4 of Patent Document 1, the cap recess 40 of Patent Document 2, the holder insertion hole 46 of Patent Document 3) is not a through hole but a bottom, and an axial type magnetic encoder Since it is a sealing type which has a partition wall (code C of patent documents 1, thin section 50 of patent documents 2) between and and a magnetic sensor, approach of a foreign substance to the inside of a bearing cap can be prevented.

JP, 2016-156493, A JP, 2016-136064, A JP, 2016-142348, A

In the axial type magnetic encoder, when the detection position by the magnetic sensor is outward in the radial direction, the detection accuracy of the rotational speed detection device can be improved. Therefore, the diameter of the magnetic encoder is increased to detect the detection position of the magnetic sensor as much as possible. It is desirable to be radially outward.
Thus, for example, as in Patent Documents 2 and 3, the radial maximum position of the inner wall forming the sensor mounting hole for holding the magnetic sensor (the cap recess 40 of Patent Document 2, the holder insertion hole 46 of Patent Document 3) (Distance R1 from the center of rotation axis: see FIG. 4 of the accompanying drawing of this application), reference numeral 37 of Japanese Patent Application Laid-Open No. 2001-101501, cylindrical portion of metal ring (10b of Patent Document 2; 35 of Patent Document 3) The position (the distance R2 from the rotation axis center: see FIG. 4 of the attached drawing of the present application) of the reference numeral 43) of Patent Document 3 is close (R11R2), and in some cases R2 <R1 For example, see FIG. 2 of Patent Document 2 and FIG. 4 of the accompanying drawings of the present application).
Therefore, in a protective cover having a shape similar to Patent Documents 2 and 3 having a sensor holder portion, when the metal ring (10b of Patent Document 2 and 35 of Patent Document 3) is extended in the axial direction so as to exceed the partition wall. And interference with the sensor mounting hole (the cap recess 40 of Patent Document 2, the holder insertion hole 46 of Patent Document 3).
As in Patent Document 1, when R2 is sufficiently larger than R1 (see, for example, FIG. 2 and FIG. 3 of Patent Document 1), the metal ring (Patent C in Patent Document 1) is exceeded. Even if the cylindrical member 2) of Document 1 is extended in the axial direction, it does not interfere with the sensor mounting hole (code 4 of Patent Document 1).

With protective covers such as Patent Documents 1 to 3, a metal ring (cylindrical member 2 of Patent Document 1, code 10b of Patent Document 2, code 35 of Patent Document 3) is set in a mold as an insert. Insert molding is performed by filling a molten fiber-reinforced synthetic resin material, which is a molding material, into a mold.
In particular, in molded articles of protective covers having shapes as described in Patent Documents 2 and 3, shrinkage due to molding shrinkage easily occurs in a disk portion (bottom plate portion) around a sensor mounting hole for holding a magnetic sensor. But the inside dent is deformed.
Accordingly, since it is not possible to precisely form the bearing surface in contact with the magnetic sensor in the molded product, it is necessary to carry out post-processing to grind and flatten the bearing surface, and the manufacturing cost is increased.

  In view of the above background, the problem to be solved by the present invention is to flatten a bearing surface on which a magnetic sensor abuts after insert molding in a protective cover having a shape similar to Patent Documents 2 and 3 having a sensor holder portion. To make unnecessary post-processing.

In order to solve the above problems, a protective cover having a sensor holder portion according to the present invention includes an inner ring having an inner ring raceway surface formed on an outer peripheral surface, an outer ring having an outer ring raceway surface formed on an inner peripheral surface, and the inner ring A bearing having rolling elements rolling between a raceway surface and the outer ring raceway surface;
A magnetic encoder located at an inner end of the bearing and fixed to the inner ring, the magnetic encoder having N poles and S poles alternately arranged circumferentially at regular intervals;
A bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder;
A cup-shaped protective cover which is press-fit into the outer ring so as to seal the inward end of the bearing.
It consists of a fiber reinforced synthetic resin main body and metal ring body integrated by insert molding,
The body is
The disc and
And a sensor holder unit for holding the magnetic sensor, wherein a sensor mounting hole for inserting the magnetic sensor is formed.
It has a partition wall which is thinner than the other part that partitions between the magnetic encoder and the magnetic sensor,
The distance R1 (mm) from the rotation axis center of the radial maximum position of the inner wall forming the sensor mounting hole of the main body is the rotation of the inner peripheral surface of the first cylindrical portion which is the portion on the outer side of the annular body R1 ≧ R2-0.6 for a distance R2 (mm) from the axis center,
The ring is
The first cylindrical portion;
Connect to the inner end of the first cylindrical portion,
A second cylindrical portion located radially outward of the radial maximum position of the inner wall, or a conical side surface of the inner wall located radially outward of the radial maximum position of the inner wall, with the diameter increasing toward the inner side With the
The axial position of the inward end of the second cylindrical portion or the axial position of the inward end of the frusto-conical side portion is located inward of the axial center position of the disc portion. It is characterized by (claim 1).

According to such a configuration, since the sensor mounting hole for holding the magnetic sensor is not a through hole but a sealing type protective cover having a partition wall, it is possible to prevent foreign matter from entering the inside of the protective cover.
In addition, the first cylinder in which the distance R1 (mm) from the rotation axis center of the radial maximum position of the inner wall forming the sensor mounting hole of the fiber reinforced synthetic resin main body is a portion on the outer side of the metal ring Since R1RR2-0.6 with respect to the distance R2 (mm) from the center of rotation axis of the inner peripheral surface of the part, the detection position by the magnetic sensor supported by the sensor mounting hole deviates radially outward Therefore, the detection accuracy of the rotational speed detection device can be improved.
Furthermore, the metal ring is connected to the first cylindrical portion and the inward end of the first cylindrical portion, and the diameter is larger than the radial maximum position of the inner wall forming the sensor mounting hole of the fiber reinforced synthetic resin main body. A second cylindrical portion which is positioned outward in the direction, or a conical side portion which is positioned radially outward of the maximum position in the radial direction of the inner wall and which expands in diameter as it goes inward; The axial position of the inward end of the portion or the inward position of the inward end of the truncated cone side portion is positioned inward of the axial center of the disc portion of the fiber-reinforced synthetic resin main body.
Therefore, in a state in which a metal ring body is set in a mold as an insert product, a fiber-reinforced synthetic resin is produced by filling a molten fiber-reinforced synthetic resin material as a molding material into the mold and performing insert molding The indented deformation due to the shrinkage due to the molding shrinkage of the disc portion of the main body can be suppressed by the rigidity of the metal ring having the above-mentioned shape.
Therefore, since the bearing surface which the magnetic sensor of the protection cover which is an insert molding product contacts can be formed with sufficient accuracy, post-processing which cuts and makes the said bearing surface flat can be made unnecessary, and manufacturing cost can be reduced.
In addition, the rigidity of the metal ring having the above-described shape can suppress deformation (waviness) of the back side portion of the inner wall forming the sensor mounting hole, so that it is not difficult to insert the magnetic sensor into the sensor mounting hole.

  Here, the axial position of the inward end of the second cylindrical portion or the axial position of the inward end of the frusto-conical side portion is the same as the axial position of the inward side of the disc portion, Or it is a more preferable embodiment to be located outward rather than the axial position of the inner side of the said disk part (Claim 2).

  According to such a configuration, the axial direction length of the metal ring is reduced and the material cost of the metal ring is increased while maintaining the effect of suppressing the in-dent deformation by the rigidity of the metal ring. Can be suppressed.

  Further, it is a further preferable embodiment to have an outward flange portion extending radially outward from the inward end of the second cylindrical portion or the inward end of the frusto-conical side portion. (Claim 3).

  According to such a configuration, the rigidity of the metal ring body is improved by the outward flange portion, and therefore, the effect of suppressing the in-dent deformation by the rigidity of the metal ring body is enhanced.

  A bearing device according to the present invention comprises a protective cover having the sensor holder portion (claim 4).

According to the protective cover having the sensor holder portion according to the present invention as described above and the bearing device provided with the protective cover, the following effects can be mainly obtained.
(1) The sealing type protective cover having the partition wall can prevent foreign matter from entering the inside of the protective cover.
(2) Since the detection position by the magnetic sensor supported by the sensor mounting hole is radially outward, detection accuracy of the rotational speed detection device can be improved.
(3) Due to the rigidity of the metal ring body, it is possible to suppress the inward concave deformation based on the shrinkage due to the molding shrinkage of the disc portion of the fiber reinforced synthetic resin main body, thereby allowing the magnetic sensor of the protective cover which is an insert molded article to abut Since the surface can be formed with high accuracy, post-processing for shaving and flattening the bearing surface can be omitted, so that the manufacturing cost can be reduced.
(4) Since the deformation (waviness) of the back side portion of the inner wall forming the sensor mounting hole can also be suppressed by the rigidity of the metal ring body, it is not difficult to insert the magnetic sensor into the sensor mounting hole.

It is a longitudinal section of a bearing device provided with a protective cover which has a sensor holder part concerning an embodiment of the invention. It is a perspective view of a protective cover which has a sensor holder part concerning an embodiment of the invention. It is a bottom view (figure seen from the inner side) similarly. It is a longitudinal cross-sectional view similarly. It is a longitudinal section perspective view similarly. It is a longitudinal cross-sectional view of the injection molding die corresponded to arrow X1-X1 cross section of FIG. 3 which shows the injection molding die which shape | molds the protective cover which has a sensor holder part which concerns on embodiment of this invention. FIG. 2 is a longitudinal sectional view showing a protective cover of Example 1; FIG. 7 is a longitudinal sectional view showing a protective cover of Example 2; FIG. 10 is a longitudinal sectional view showing a protective cover of Example 3; It is a longitudinal cross-sectional view which shows the protective cover of a comparative example. It is a longitudinal cross-sectional view which shows a modification. It is a longitudinal cross-sectional view which shows a modification.

Next, the present invention will be described in more detail based on the embodiments shown in the attached drawings.
In the present specification, the direction of the rotation axis of the bearing device A is referred to as “axial direction”, and the direction orthogonal to the axial direction is referred to as “radial direction”.
Also, with the bearing 11 and the protective cover 1, with the protective cover 1 attached to the bearing 11, the direction parallel to the axial direction from the vehicle body to the wheel side of the automobile is “outward” and the opposite direction is “inward”. It is said.

<Bearing device>
As shown in the longitudinal sectional view of FIG. 1, in addition to the bearing 11 in which the inner ring 12 rotates relative to the outer ring 13, the bearing device A according to the embodiment of the present invention A sensor 9 and a seal member 15 and the like disposed at an end (see an arrow C1) side of the bearing 11 are provided.

The bearing 11 rolls between the inner ring 12 with the inner ring raceway surface 12A formed on the outer peripheral surface, the outer ring 13 with the outer ring raceway surface 13A formed on the inner peripheral surface, and between the inner ring raceway surface 12A and the outer ring raceway surface 13A. And so on.
The magnetic encoder 16 is formed by arranging N poles and S poles alternately in the circumferential direction at regular intervals, and is fixed to the inner ring 12 by a support member 17 located at the inner end (see arrow C2) of the bearing 11 Ru.
The protective cover 1 has a cup shape, and is attached to the outer ring 13 so as to seal the inner end of the bearing 11 and has a sensor holder portion 4 for holding the magnetic sensor 9.
The magnetic sensor 9 mounted on the sensor holder portion 4 of the protective cover 1 faces the magnetic encoder 16 with the partition wall 5 separated, and detects the rotation of the magnetic encoder 16.

With the protective cover 1, the magnetic sensor 9 faces the magnetic encoder 16 with the partition wall 5 separated, and there is no through hole in the sensor holder portion 4 penetrating in the thickness direction, so there is no need to incorporate a seal member such as an O ring. .
In addition, since one end of the bearing 11 in the axial direction is sealed by the protective cover 1, pebbles, muddy water, and the like do not hit the magnetic encoder 16, so that damage to the magnetic encoder 16 can be prevented.
Furthermore, since the inward end of the bearing 11 is sealed by the protective cover 1, the seal member on the inward side of the magnetic encoder 16 is not necessary, so that the rotational torque of the bearing 11 can be reduced by reducing the sliding resistance. .
Furthermore, since the protective cover 1 is provided with the sensor holder portion 4, the complexity of the air gap adjustment operation between the magnetic encoder 16 and the magnetic sensor 9 can be eliminated.

<Protective cover>
As shown in the longitudinal sectional view of FIG. 1, the perspective view of FIG. 2, the bottom view of FIG. 3, the longitudinal sectional view of FIG. 4 and the longitudinal sectional perspective view of FIG. 5, a protective cover 1 according to the embodiment of the present invention. Is composed of a fiber reinforced synthetic resin main body 1A and a metal ring body 1B integrated by insert molding.
Here, as a fiber-reinforced synthetic resin for molding the main body 1A, for example, a synthetic resin such as polyamide (nylon 6, nylon 66, nylon 612, etc.), polyphenylene sulfide (PPS), or polybutylene terephthalate (PBT) is used. A fiber containing 20 to 70% by weight, preferably 40 to 60% by weight of fiber is used.
The main body 1A is composed of a disk portion 2, a cylindrical portion 3 and a sensor holder portion 4, and has a partition wall 5 which is thinner than the other portions for partitioning between the magnetic encoder 16 and the magnetic sensor 9.
The sensor holder 4 holds a nut 10 screwed with a mounting bolt B for mounting the magnetic sensor 9, and has a sensor mounting hole 4A into which the magnetic sensor 9 is inserted.

The distance R1 (mm) from the rotation axis center O (FIG. 3) of the radial maximum position D of the inner wall forming the sensor mounting hole 4A of the main body 1A shown in FIG. 4 is the outer side of the ring 1B (see arrow C1) R1 ≧ R2-0.6 with respect to the distance R2 (mm) from the rotation axis center O of the inner peripheral surface 6A of the first cylindrical portion 6 which is the side portion.
Therefore, since the detection position by the magnetic sensor 9 supported by the sensor mounting hole 4A is located radially outward, the detection accuracy of the rotational speed detection device can be improved.

The annular body 1B is connected to the first cylindrical portion 6 and the inward (see arrow C2) side end of the first cylindrical portion 6 and is radially outward of the radial maximum position D of the inner wall forming the sensor mounting hole 4A. And an outwardly facing flange portion 8 extending radially outward from an inner end of the second cylindrical portion 7.
Here, in the range of R1 ≧ R2-0.6 of the present invention, a crack may occur due to thermal shock, and the flowability is also bad, and there is a concern about filling failure. Therefore, the second cylindrical portion 7 located radially outward of the radial maximum position D of the inner wall forming the sensor mounting hole 4A is provided on the metal ring 1B.
Further, as shown in the longitudinal sectional view of FIG. 8, the axial position of the inward side end F of the second cylindrical portion 7 of the annular body 1B is the central position E in the axial direction (thickness direction) of the disc portion 2 of the main body 1A. Located more inward than.

<Insert molding>
Next, insert molding of the protective cover 1 shown in FIGS. 2 to 5 will be described with reference to FIG. 6 which is a longitudinal sectional view of an injection molding die corresponding to a cross section taken along arrow X1-X1 in FIG.
First, as shown in the longitudinal sectional view of FIG. 6, the nut 10 as an insert is set on the support shaft 20 of the fixed mold 18, and the metal ring 1B as an insert is set on the movable mold 19, and then injection is performed. The fixed mold 18 and the movable mold 19 attached to the molding machine are clamped.

Next, the melted fiber-reinforced synthetic resin material is filled from the gate (not shown) into the cavity between the fixed mold 18 and the movable mold 19.
In addition, arrangement | positioning of a gate is suitably set up in consideration of the fillability to the partition wall 5 using the simulation tool etc. for plastic injection molding.
Next, after the fiber-reinforced synthetic resin material is cooled and solidified, the movable mold 19 is opened to take out the insert-molded product.

In the protective cover 1 which is an insert-molded product manufactured through the above-described insert molding, since the synthetic resin enters the circumferential groove 10A of the nut 10, the nut 10 is prevented from coming off.
Further, since the cylindrical portion 3 wraps around the outer (see arrow C1) side end portion of the metal ring 1B, the metal ring 1B and the fiber reinforced synthetic resin main body 1A are mechanically coupled.

Furthermore, the metal ring body 1B has the shape as described above as shown in FIG. 7, and the axial position of the inward (see arrow C2) side end F of the second cylindrical portion 7 of the ring body 1B is the main body 1A. Is located inward from the central position E in the axial direction (thickness direction) of the disk portion 2.
Therefore, it is possible to suppress the inward concave deformation based on the shrinkage due to the molding shrinkage of the disc portion 2 of the fiber-reinforced synthetic resin main body 1A when performing the insert molding, by the rigidity of the metal ring body 1B of the above shape.
Therefore, since the bearing surface which the magnetic sensor 9 of the protective cover 1 which is an insert molding product contact | abut can be formed precisely, post-processing which scrapes the said bearing surface and makes it flat can be made unnecessary, and manufacturing cost can be reduced.

Moreover, the metal ring body 1B has the outward flange portion 8 extending radially outward from the inward end of the second cylindrical portion 7, whereby the rigidity of the metal ring body 1B is achieved. As a result, the effect of suppressing the above-mentioned concave deformation due to the rigidity of the metal ring 1B is enhanced.
Furthermore, the rigidity of the metal annular body 1B having the above-mentioned shape can suppress deformation (waviness) of the back side portion of the inner wall forming the sensor mounting hole 4A, so it is difficult to insert the magnetic sensor 9 into the sensor mounting hole 4A. It will never be.

<Curve deformation analysis after injection molding>
The warpage deformation analysis after injection molding was performed using Simulation Moldflow which is a simulation tool for plastic injection molding.

(Analysis conditions and evaluation items)
Material data of fiber reinforced synthetic resin was obtained by adding 50% by weight of glass fiber to PA66, material data of metal ring bodies 1B and 1B ′ as SPCC, and material data of nut 10 as brass.
The molding conditions are as follows: resin temperature is 290 ° C, mold temperature is 100 ° C, holding pressure is 80MPa, axial position F, F 'of inner side end of metal ring bodies 1B, 1B' are changed, and manufactured The inclination of the nut 10 was used as an evaluation item for the embodiment and the comparative example.

(Example and Comparative Example)
In the following examples and comparative examples, the axial length (thickness) of the disk portion 2 of the fiber-reinforced synthetic resin main body 1A is 4 mm.

Example 1
In the protective cover 1 shown in the longitudinal sectional view of FIG. 7, the axial position F of the inward end (the inward end of the second cylindrical portion 7) of the metal ring 1B is the fiber reinforced synthetic resin main body 1A. It is located inward of the axial position of the inner side surface 2A of the disk portion 2 by the length H (see the arrow C2). The thing of H = 0.5 mm was made into Example 1.

(Example 2)
In the protective cover 1 shown in the longitudinal sectional view of FIG. 8, the axial position F of the inward end (the inward end of the second cylindrical portion 7) of the metal ring 1B is the fiber reinforced synthetic resin main body 1A. This is the same as the axial position of the inward side surface 2A of the disk portion 2 and this is taken as the second embodiment.

(Example 3)
In the protective cover 1 shown in the longitudinal sectional view of FIG. 9, the axial position F of the inward end (the inward end of the second cylindrical portion 7) of the metal ring 1B is the fiber reinforced synthetic resin main body 1A. It is located outward by the length I (see arrow C1) than the axial position of the inner side surface 2A of the disk portion 2. The one with I = 1.2 mm was taken as Example 3.

(Comparative example)
In the protective cover 1 ′ shown in the longitudinal sectional view of FIG. 10, the metal ring body 1B ′ does not have the second cylindrical portion 7 in comparison with the metal ring body 1B of the above embodiment, and It has an outward facing flange portion 8 'that extends radially outward from the inner (see arrow C2) side end.
The axial position F 'of the inner side end (the inner side end of the first cylindrical portion 6) of the metal ring 1B' is the outer side surface 2B of the disc portion 2 of the fiber reinforced synthetic resin main body 1A. It is located outward by the length J (see arrow C1) than the axial position. The one with J = 0.2 mm was taken as a comparative example.

(Analysis result and consideration)
The inclination of the nut 10 was about 20 for the comparative example, about 20 for the example 1, about 20 for the example 2, and about 30 for the example 3.
As in the first to third embodiments, the axial position F of the inward end (the inward end of the second cylindrical portion 7) of the metal ring 1B is inward of the axial center position E of the disc portion 2. By positioning in the direction (see the arrow C2), the effect of suppressing the inclination of the nut 10 is enhanced.

  Further, since the inclinations of the nuts 10 in the first embodiment and the second embodiment are substantially the same, the axial length of the metal annular body 1B is maintained while maintaining the effect of suppressing the inclination of the nut 10 by the rigidity of the metal annular body 1B. In order to suppress the increase in material cost of the metal ring body 1B by reducing the size, the axial position F is positioned inward of the axial center position E of the disk portion 2 (see the arrow C2). It is a more preferable embodiment to position the same in the axial direction position of the inward side surface 2A of the disk portion 2 or to the outside (refer to the arrow C1) than the axial direction position of the inward surface 2A of the disk portion 2.

<Modification>
The metal ring body 1B in the protective cover 1 having the sensor holder portion of the present invention is not limited to the one having the second cylindrical portion 7 as shown in the longitudinal sectional views of FIGS. It may have a frusto-conical side portion 21 such as a metal ring 1B in plan view.
The frusto-conical side surface-like portion 21 is connected to the inward (see arrow C2) side end of the first cylindrical portion 6, and radially outward from the radial maximum position D of the inner wall forming the sensor mounting hole 4A of the main body 1A. Position and expand in diameter as you go inward (see arrow C2).
Here, in the range of R1 ≧ R2-0.6 of the present invention, a crack may occur due to thermal shock, and the flowability is also bad, and there is a concern about filling failure. Therefore, the metal ring body 1B is provided with a truncated cone side surface-like portion 21 which is located radially outward of the radial maximum position D of the inner wall forming the sensor mounting hole 4A and which expands in diameter as it goes inward There is.
Further, the metal ring body 1B in the protective cover 1 having the sensor holder portion of the present invention is not limited to the one having the outward facing flange 8 as in the longitudinal sectional views of FIGS. 7 to 9 and FIG. Also, the case without the outward facing flange 8 as in the metal ring 1B of the longitudinal sectional view of FIG. 12 is included.

  The descriptions in the above embodiments are all illustrative and not restrictive. Various modifications and changes can be made without departing from the scope of the present invention.

1,1 'Protective cover (insert molded item)
1A Fiber Reinforced Plastic Body 1B, 1B 'Metal Ring (Insert)
Reference Signs List 2 disc portion 2A inward side surface 2B outward side surface 3 cylindrical portion 4 sensor holder portion 4A sensor mounting hole 5 partition wall 6 first cylindrical portion 6A inner circumferential surface 7 second cylindrical portion 8, 8 'outward flange portion 9 magnetic sensor 10 nut (inserted product)
DESCRIPTION OF SYMBOLS 10A circumferential groove 11 bearing 12 inner ring 12A inner ring raceway surface 13 outer ring 13A outer ring drive surface 14 rolling element 15 seal member 16 magnetic encoder 17 support member 18 fixed die 19 movable die 20 support shaft 21 truncated cone side portion A bearing device B mounting bolt C1 outward C2 inward D radial maximum position E of the inner wall forming the sensor mounting hole E axial center position F, F 'of the disk portion axial position of the inward end O rotational axis center P melted fiber reinforced synthetic resin Material R1 Distance from the center of rotation axis of the radial maximum position of the inner wall forming the sensor mounting hole R2 Distance from the center of rotation axis of the inner surface of the first cylindrical part

Claims (4)

An inner ring having an inner ring raceway surface formed on an outer peripheral surface, an outer ring having an outer ring raceway surface formed on an inner peripheral surface, and a bearing having rolling elements rolling between the inner ring raceway surface and the outer ring raceway surface;
A magnetic encoder located at an inner end of the bearing and fixed to the inner ring, the magnetic encoder having N poles and S poles alternately arranged circumferentially at regular intervals;
A bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder;
A cup-shaped protective cover which is press-fit into the outer ring so as to seal the inward end of the bearing.
It consists of a fiber reinforced synthetic resin main body and metal ring body integrated by insert molding,
The body is
The disc and
And a sensor holder unit for holding the magnetic sensor, wherein a sensor mounting hole for inserting the magnetic sensor is formed.
It has a partition wall which is thinner than the other part that partitions between the magnetic encoder and the magnetic sensor,
The distance R1 (mm) from the rotation axis center of the radial maximum position of the inner wall forming the sensor mounting hole of the main body is the rotation of the inner peripheral surface of the first cylindrical portion which is the portion on the outer side of the annular body R1 ≧ R2-0.6 for a distance R2 (mm) from the axis center,
The ring is
The first cylindrical portion;
Connect to the inner end of the first cylindrical portion,
A second cylindrical portion located radially outward of the radial maximum position of the inner wall, or a conical side surface of the inner wall located radially outward of the radial maximum position of the inner wall, with the diameter increasing toward the inner side With the
The axial position of the inward end of the second cylindrical portion or the axial position of the inward end of the frusto-conical side portion is located inward of the axial center position of the disc portion. Feature
Protective cover having a sensor holder portion. The axial position of the inward end of the second cylindrical portion or the axial position of the inward end of the frusto-conical side portion is the same as the axial position of the inward side of the disc portion, or the disc Located outside the axial position of the inner side of the part,
The protective cover which has a sensor holder part of Claim 1. And an outward flange portion extending radially outward from the inward end of the second cylindrical portion or the inward end of the frusto-conical side portion.
The protective cover which has a sensor holder part of Claim 1 or 2.   The bearing apparatus provided with the protective cover which has a sensor holder part in any one of Claims 1-3.

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