JP2010151279A - Wheel bearing device with rotation speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotation speed detector that protects a pulsar ring by a protective cover, suppresses deformation of the protective cover by enhancing its strength and rigidity, and improves reliability of rotation speed detection by improving positioning accuracy. <P>SOLUTION: The protective cover 10 is formed into a cup-like shape by press working a cold rolled steel plate and includes a fitting part 10a press-fitted in an inner periphery of an end of an outer member 2, a disk-like shielding part 10b extending inwardly in the radial direction from the fitting part 10a, a bottom part 10d blocking an end of an inner member 1 from the shielding part 10b via an inclined part 10c, and a stepped part 10e at the center of the bottom part 10d and expanding in a recess 7a of a caulking part 7. A through hole 14 is formed at a position in the shielding part 10b corresponding to a sensor in a dimension exceeding a span in which the characteristics of the pulsar ring 11 is changed, a rubber member 15 is laid to cover an exposed outer surface of the protective cover 10, and the sensor is opposingly disposed with respect to the through hole 14 via the rubber member 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotational speed detection device that rotatably supports a wheel of an automobile or the like and incorporates a rotational speed detection device that detects the rotational speed of the wheel.

  Rotation speed detection device with built-in rotation speed detection device for detecting the rotation speed of the vehicle and controlling the anti-lock brake system (ABS) while supporting the wheel of the automobile to the suspension system. Wheel bearing devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. It is integrated with. A rotational speed sensor that is arranged facing this magnetic encoder and detects a change in magnetic pole of the magnetic encoder accompanying the rotation of the wheel is mounted on the knuckle after the wheel bearing device is mounted on the knuckle constituting the suspension device. .

  A structure as shown in FIG. 11 is known as an example of such a wheel bearing device with a rotational speed detection device. The wheel bearing device with a rotational speed detection device includes an outer member 50, an inner member 51, and a plurality of balls 52 accommodated between the outer member 50 and the inner member 51. The inner member 51 includes a hub ring 53 and an inner ring 54 press-fitted into the hub ring 53.

  The outer member 50 integrally has a vehicle body mounting flange 50b fixed to the knuckle 65 constituting the suspension device on the outer periphery, and double row outer rolling surfaces 50a and 50a are integrally formed on the inner periphery. A sensor 63 is supported and fixed to the knuckle 65 by a screw 66.

  The hub wheel 53 integrally has a wheel mounting flange 55 for mounting a wheel (not shown) at one end, an inner rolling surface 53a on the outer periphery, and a small diameter step extending in the axial direction from the inner rolling surface 53a. A portion 53b is formed. The inner ring 54 has an inner rolling surface 54a formed on the outer periphery, and is fixed in the axial direction by a caulking portion 53c formed by plastically deforming an end portion of the small diameter step portion 53b.

  A seal ring 56 is fitted and fixed to the outer end portion of the outer member 50, and the lip of the seal ring 56 is in sliding contact with the base portion 55 a of the wheel mounting flange 55. On the other hand, an encoder 57 is fitted and fixed to the outer peripheral surface of the inner end portion of the inner ring 54. The encoder 57 includes a support ring 58 having an L-shaped cross section, and an annular encoder body 59 attached and supported on the side surface of the support ring 58 over the entire circumference. In the encoder body 59, magnetic poles N and S are alternately magnetized at equal intervals in the circumferential direction.

  The inner end opening of the outer member 50 is closed by the cover 60. The cover 60 is formed in a petri dish from a nonmagnetic plate material such as a non-magnetic stainless steel plate, an aluminum alloy plate, or a high-functional resin, and has a circular closing plate portion 61 and an outer peripheral edge portion of the closing plate portion 61. And a cylindrical fitting portion 62 formed in the above.

The side surface of the encoder main body 59 that constitutes the encoder 57 is disposed in close proximity to the cover 60, and the detection unit 64 of the sensor 63 is in proximity to or in contact with the side surface of the cover 60. Are opposed to each other through a cover 60. Thereby, the presence of the cover 60 can prevent water, iron powder, magnetic fragments, etc. from entering between the sensor 63 and the encoder 57, thereby preventing the sensor 63 and the encoder 57 from being damaged. It is possible to prevent the regular and periodic magnetic property changes of the main body 59 from being disturbed or deteriorated.
JP 2000-249138 A

  However, such a conventional wheel bearing device with a rotational speed detection device has the following problems. First, the cover 60 is formed from a nonmagnetic plate material such as a nonmagnetic stainless steel plate, an aluminum alloy plate, or a high-performance resin. For example, in a nonmagnetic stainless steel plate, a general-purpose cold rolling is used. Compared to steel plates, not only is the material itself expensive, but the workability in press molding is poor, and it is difficult to accurately form complex shapes. Therefore, the fitting portion with the outer member 50 may not be formed with a desired shape and dimensional accuracy. In this case, the positioning of the cover 60 with respect to the outer member 50 is unstable, and the cover 60 is defined by a stepping stone or the like when the cover 60 is mounted, when the bearing alone is transported, assembled to the vehicle, or after the wheels are mounted. There is a risk of displacement.

  Further, since the shape of the cover 60 is a simple U-shaped cross section, the rigidity is insufficient, and the cover 60 may be deformed by contact with a flying stone or the like, and may come into contact with the encoder main body 59. Furthermore, since the detection unit of the sensor faces the encoder 57 via the cover 60, the air gap may be increased and the detection accuracy may be reduced.

  On the other hand, when the cover 60 is formed of a non-magnetic plate material such as an aluminum alloy plate or a high-functional resin, a complicated shape can be formed with high accuracy, but the strength and rigidity are insufficient, and a collision with a flying stone or the like may occur. There is a possibility that the cover 60 may be deformed and contact the encoder main body 59, or may be damaged to deteriorate the sealing performance.

  The present invention has been made in view of such circumstances, and while protecting the pulsar ring with a protective cover, the strength and rigidity of the protective cover are increased to suppress deformation, and the positioning accuracy is increased to increase the reliability of rotation speed detection. An object of the present invention is to provide a wheel bearing device with a rotational speed detection device with improved performance.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel attachment for attaching a wheel to one end. The hub ring has a flange integrally formed with a small diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small diameter step portion of the hub ring. An inner member in which a double-row inner rolling surface facing the running surface is formed, and a double-row rolling element that is movably accommodated between the inner and outer members. And a pulsar ring externally fitted to the inner ring, a seal is mounted on the outer side end of the outer member, and a protective cover is mounted on the inner side end of the outer member, Rotation in which the opening of the annular space formed by the outer member and the inner member is sealed In the wheel bearing device with a degree detection device, the protective cover is formed in a substantially cup shape by pressing from a cold rolled steel plate, and is a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member; A disc-shaped shielding portion extending radially inward from the fitting portion; and a bottom portion that closes an inner side end of the inner member from the shielding portion via an inclined portion, and the protective cover includes: The outer member is positioned in contact with a step formed on the inner periphery of the end portion, and a through hole is formed at a position corresponding to the sensor detection portion of the shielding portion. The exposed outer surface is covered with a rubber member, and the detection portion of the sensor is arranged opposite to the rubber member through a predetermined air gap.

  In this way, the pulsar ring that is externally fitted to the inner ring is provided, the seal is attached to the outer end of the outer member, and the protective cover is attached to the inner end of the outer member. In the wheel bearing device with a rotational speed detection device in which the opening of the annular space formed by the inner member and the inner member is sealed, the protective cover is formed in a substantially cup shape by pressing from a cold rolled steel plate, A cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the member, a disk-shaped shielding portion that extends radially inward from the fitting portion, and an inner member inner member through an inclined portion from the shielding portion The protective cover is positioned by abutting against a step formed on the inner periphery of the end of the outer member, and the position corresponding to the detection part of the sensor of the shielding part A through hole is formed in the protective cover and the protective cover is exposed. A rubber member is coated on the surface, and the detection part of the sensor is arranged opposite to the predetermined air gap via this rubber member, so that the workability of the protective cover is good and a complicated shape is accurately formed at low cost. In addition, the stepped shape increases the strength and rigidity of the protective cover, and can suppress deformation due to collision of flying stones. In addition, since the protective cover is press-fitted until it abuts against the stepped portion of the outer member, the positioning accuracy of the protective cover with respect to the outer member can be increased, and highly reliable speed detection is performed by accurate air gap adjustment. be able to. Furthermore, since the outer surface of the protective cover is covered with a rubber member, it is excellent in corrosion resistance, ensuring sealing performance and preventing rusting over a long period of time, thereby improving strength and durability. And does not adversely affect the sensing performance of the sensor.

  Preferably, as in the second aspect of the present invention, when the through hole is set to a size exceeding a span in which the characteristics of the pulsar ring change, stable output characteristics can be obtained at the time of sensor detection.

  Further, as in the invention described in claim 3, if the through-hole is formed in an eyebrow shape, even if there is an error in the positioning accuracy in the circumferential direction of the protective cover with respect to the sensor, it can be tolerated.

  Further, as in the invention according to claim 4, when a plurality of the through holes are formed in the circumferential direction, when the protective cover is positioned and fixed to the outer member in a phase-matched state, Phase adjustment is completed in a short time, and workability is improved.

  Further, as in the invention described in claim 5, the pulsar ring is a cylindrical portion that is press-fitted into the outer diameter of the inner ring, and a support ring that includes a standing plate portion that extends radially outward from the cylindrical portion; A magnetic encoder integrally joined to the side surface of the standing plate portion of the support ring, the support ring is formed from a ferromagnetic steel plate by press working, and the magnetic encoder is made of magnetic powder on synthetic rubber. If magnetic poles N and S are magnetized alternately at equal pitches in the circumferential direction, the support ring is prevented from rusting and the magnetic output of the magnetic encoder is strengthened to ensure stable detection accuracy. can do.

  Further, as in the invention according to claim 6, a recess is formed at the inner side end of the hub wheel, and a stepped portion that bulges into the recess at the center of the bottom of the protective cover Is formed, the rigidity of the protective cover is further increased, and deformation due to flying stones or the like can be suppressed.

  Moreover, if the said step part is formed in the cross-sectional substantially rectangular shape along the shape of the said recessed part like invention of Claim 7, the rigidity of a protective cover will become higher further.

  Preferably, as in the invention described in claim 8, when the protective cover is made of a magnetic material and the plate thickness is set in a range of 0.4 to 0.8 mm, the workability of the press is further improved. In addition, the air gap can be set small.

  Further, as in the ninth aspect of the invention, if the outermost diameter portion of the rubber member protrudes to the outer diameter side from the outer diameter of the fitting portion of the protective cover, a seal portion is formed. The seal portion is elastically deformed when the protective cover is press-fitted into the outer member, and the annular gap between the fitting portion and the outer member is filled in a state of being in close contact with the inner peripheral surface of the end portion of the outer member. Thus, foreign matters such as rainwater and dust can be reliably prevented from entering the inside of the bearing from the fitting portion between the protective cover and the outer member.

  Further, as in the invention described in claim 10, if the predetermined mark is formed at a position corresponding to the through hole on the outer surface of the rubber member, the through hole of the protective cover cannot be visually observed by the rubber member. However, the protective cover can be easily positioned and fixed to the outer member.

  Further, as in the invention described in claim 11, a convex portion having substantially the same shape as the shape of the through hole is formed at a position corresponding to the through hole on the outer surface of the rubber member. If the detection part of the sensor is close or abutted, the protective cover can be easily positioned and fixed to the outer member even if the through hole of the protective cover cannot be seen by the rubber member, and the air gap can be reduced. It can be set small, the detection output becomes strong, and stable detection accuracy can be ensured.

  According to a twelfth aspect of the present invention, a recess having substantially the same shape as the through hole is formed at a position corresponding to the through hole on the outer surface of the rubber member, and the sensor is formed in the recess. If the detection part is close or abutted, the protective cover can be easily positioned and fixed to the outer member even if the through hole of the protective cover cannot be seen by the rubber member. The air gap can be set small, the detection output becomes strong, and stable detection accuracy can be ensured.

  Further, as in the invention described in claim 13, if protrusions are formed on both sides of the outer surface of the rubber member at positions corresponding to the through holes, the protrusions allow the rubber member to pass through the protective cover. Even if it is not visible, the protective cover can be easily positioned and fixed to the outer member, and the range of the through-hole can be easily determined. Can be easily assembled and adjusted.

  The wheel bearing device with a rotational speed detection device according to the present invention is integrally formed with an outer member in which a double row outer rolling surface is integrally formed on the inner periphery and a wheel mounting flange for mounting a wheel on one end. A hub ring having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, and facing the outer surface of the double row on the outer periphery. An inner member in which a double-row inner rolling surface is formed, a double-row rolling element housed between the inner member and the outer member so as to roll freely, and the inner ring And a palsar ring fitted on the outer member, and a seal is attached to the outer end of the outer member, and a protective cover is attached to the inner end of the outer member. Rotational speed detection in which the opening of the annular space formed by the inner member is sealed In the wheel bearing device with a device, the protective cover is formed into a substantially cup shape by press working from a cold rolled steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member. A disc-shaped shielding portion extending radially inward from the joint portion, and a bottom portion closing the inner side end of the inner member from the shielding portion via an inclined portion, and the protective cover includes the outer cover And positioned in contact with the step formed on the inner periphery of the end of the side member, and a through hole is formed at a position corresponding to the sensor detection portion of the shielding portion, and the protective cover is exposed. The outer surface is covered with a rubber member, and the detection part of the sensor is placed opposite to the rubber member via a predetermined air gap, so that the workability of the protective cover is good and a complicated shape is accurately produced at low cost. Can be molded and corrugated Strength and rigidity of the protective cover by can shape increases, it is possible to suppress the deformation due to collision or the like stepping stones. In addition, since the protective cover is press-fitted until it abuts against the stepped portion of the outer member, the positioning accuracy of the protective cover with respect to the outer member can be increased, and highly reliable speed detection is performed by accurate air gap adjustment. be able to. Furthermore, since the outer surface of the protective cover is covered with a rubber member, it is excellent in corrosion resistance, ensuring sealing performance and preventing rusting over a long period of time, thereby improving strength and durability. And does not adversely affect the sensing performance of the sensor.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and having one inner rolling surface opposed to the double-row outer rolling surface on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring that is press-fitted into the small-diameter step portion and formed with the other inner rolling surface opposite to the double row outer rolling surface, and the inner member and the outer member. A caulking formed by plastically deforming an end portion of a small-diameter step portion of the hub wheel, comprising a double-row rolling element that is rotatably accommodated between the running surfaces, and a magnetic encoder that is externally fitted to the inner ring. The inner ring is fixed in an axial direction with respect to the hub ring by the portion, and the outer ring A rotational speed detection device in which a seal is attached to an end on the outer side of the material, a protective cover is attached to an end on the inner side, and an opening of an annular space formed by the outer member and the inner member is sealed In the attached wheel bearing device, the protective cover is formed in a substantially cup shape by pressing from a cold rolled steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member. A disc-shaped shielding part extending radially inward from the part, a bottom part closing the inner side end of the inner member from the shielding part via an inclined part, and the crimping part at the center part of the bottom part A stepped portion that bulges into the recess, and a through hole is formed at a position corresponding to the detection portion of the sensor of the shielding portion, and the through hole has a dimension that exceeds a span where the characteristics of the pulsar ring change. And the exposed outer surface of the protective cover Rubber member is coated, the detection portion of the sensor through the rubber member is arranged opposite at a predetermined air gap.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 1, and FIG. FIG. 4 is a side view of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device with a rotational speed detecting device is for a driven wheel called a third generation, and is housed between the inner member 1, the outer member 2, and both the members 1 and 2 so as to roll freely. Double-row rolling elements (balls) 3 and 3 are provided. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The outer member 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 2b for mounting to a knuckle (not shown) on the outer periphery. Double row outer rolling surfaces 2a, 2a are integrally formed. These double-row outer raceway surfaces 2a and 2a are formed with a hardened layer having a surface hardness of 58 to 64 HRC by induction hardening.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and hub bolts 6a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Moreover, the inner side rolling surface 4a which opposes one (outer side) of the said double row outer side rolling surface 2a, 2a and the small diameter step part 4b extended in an axial direction from this inner side rolling surface 4a are formed in outer periphery. Yes. On the other hand, the inner ring 5 is formed on the outer periphery with an inner rolling surface 5a facing the other (inner side) of the double row outer rolling surfaces 2a, 2a, and a small-diameter step portion 4b of the hub wheel 4 via a predetermined shimoshiro. It is press-fitted. The inner ring 5 is fixed in the axial direction in a state where a predetermined bearing preload is applied by a crimping portion 7 formed by plastically deforming an end portion of the small-diameter stepped portion 4b of the hub wheel 4 radially outward. .

  Between the double row outer rolling surfaces 2a, 2a of the outer member 2 and the double row inner rolling surfaces 4a, 5a facing these, the double row rolling elements 3, 3 are respectively accommodated, and the cage 8 , 8 are held so as to roll freely. Of the opening in the annular space formed between the outer member 2 and the inner member 1, the seal 9 is attached to the outer opening, and the protective cover 10 is attached to the inner opening. It is installed and prevents leakage of lubricating grease sealed inside the bearing and prevents rainwater and dust from entering the bearing from the outside.

  In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, it is not restricted to this, The double row tapered roller bearing which used the tapered roller for the rolling element 3 It may consist of. In addition, here, a third generation structure in which the inner rolling surface 4a is formed directly on the outer periphery of the hub wheel 4 is illustrated, but although not shown, a pair of inner rings are press-fitted and fixed to the small-diameter step portion of the hub wheel. It may be a first generation or second generation structure.

  The hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the inner rolling surface 4a to the base 6b on the inner side of the wheel mounting flange 6 to the small diameter step 4b. The surface is hardened by induction hardening in the range of 58 to 64 HRC. In addition, the crimping part 7 is made into the surface hardness after a forge process. This facilitates the caulking process, prevents the occurrence of microcracks during the process, improves not only the wear resistance of the base part 6b serving as the seal land part of the seal 9, but also loads the wheel mounting flange 6. Therefore, the durability of the hub wheel 4 is improved. The inner ring 5 and the rolling element 3 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching.

  The seal 9 is an integrated seal comprising a core metal press-fitted to the inner periphery of the outer side end portion of the outer member 2 via a predetermined shimiro, and a seal member joined to the core metal and having a side lip. It consists of Further, the base portion 6b on the inner side of the wheel mounting flange 6 is formed in a curved surface having a circular cross section, and constitutes a seal land portion in which the side lip of the seal 9 is in sliding contact.

  A pulsar ring 11 having an L-shaped cross section is fitted on the inner ring 5. As shown in an enlarged view in FIG. 2, the pulsar ring 11 includes a cylindrical portion 12a that is press-fitted into the outer diameter of the inner ring 5, and a support ring 12 that includes a standing plate portion 12b that extends radially outward from the cylindrical portion 12a. And a magnetic encoder 13 integrally joined to the side surface of the upright plate portion 12b of the support ring 12 by vulcanization adhesion or the like. In the magnetic encoder 13, magnetic powder such as ferrite is mixed in synthetic rubber, and magnetic poles N and S are magnetized alternately at equal pitches in the circumferential direction. When a detection unit of a sensor (not shown) is opposed to the magnetic encoder 13 through a predetermined air gap, and the magnetic encoder 13 is rotated together with the inner ring 5 as the wheel is rotated, the output of the sensor opposed to the magnetic encoder 13 is output. Changes, and this output signal is input to a controller (not shown) to control the ABS (anti-lock brake system).

  Further, the support ring 12 is pressed from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC or the like). It is formed by processing. As a result, it is possible to prevent the support ring 12 from rusting and to increase the magnetic output of the magnetic encoder 13 to ensure stable detection accuracy.

  Here, the support ring 12 and the support ring 12 are integrally bonded to each other by vulcanization, and magnetic powder such as ferrite is mixed in an elastomer such as synthetic rubber so that the magnetic poles N and S are alternately arranged in the circumferential direction. Although the pulsar ring 11 composed of the magnetized magnetic encoder is illustrated, the present invention is not limited to this, and any configuration may be used as long as the characteristics change alternately in the circumferential direction and at equal intervals. Pulsaring that was done is also acceptable.

  The protective cover 10 attached to the inner end of the outer member 2 is formed in a substantially cup shape by pressing from SPCC, SPCD, SPCE of a cold rolled steel plate (JIS G 3141 of JIS standard). . Among these, SPCD excellent in press workability is preferable. The protective cover 10 is press-fitted into the inner periphery of the end of the outer member 2 and is positioned on a stepped portion 2c formed on the inner periphery of the outer member 2, and the fitting portion 10a. A disc-shaped shielding portion 10b extending radially inward from 10a and a bottom portion 10d that closes the inner side end of the inner member 1 through the inclined portion 10c from the shielding portion 10b. A stepped portion 10e that bulges into the recess 7a of the caulking portion 7 is formed at the center of the bottom portion 10d (see FIG. 1).

  Here, in the present embodiment, the protective cover 10 is made of a magnetic material, the plate thickness t is set to 0.4 to 0.8 mm, and the sensor cover of the shielding unit 10b is located at a position corresponding to the detection unit (not shown). A circular through hole 14 is formed by punching. As shown in FIG. 3, the through hole 14 is set to have a span where the characteristics of the magnetic encoder 13 change, that is, a diameter exceeding two poles of the magnetic poles N and S, so that a stable output characteristic can be obtained when the sensor is detected. Has been. Further, the exposed outer surface of the protective cover 10 is covered with a rubber member 15. The rubber member 15 is made of synthetic rubber such as ACM (polyacrylic rubber) or NBR (acrylonitrile-butadiene rubber), and is integrally joined to the protective cover 10 by vulcanization adhesion. And the detection part of the sensor which is not illustrated is oppositely arranged by the predetermined air gap (axial clearance) via the rubber member 15 in the position corresponding to the penetration hole 14 of shielding part 10b. The rubber member 15 is not limited to those described above, but includes, for example, HNBR (hydrogenated acrylonitrile-butadiene rubber), EPDM (ethylene / propylene rubber), FKM (fluoro rubber), or EPM having excellent heat resistance. Examples thereof include (ethylene / propylene rubber) and silicon rubber.

  In the present embodiment, a seal portion 15 a is formed at the outermost diameter portion of the rubber member 15 so as to protrude further toward the outer diameter side than the outer diameter of the fitting portion 10 a of the protective cover 10. The seal portion 15a is elastically deformed when the protective cover 10 is press-fitted into the outer member 2, and an annular clearance between the fitting portion 10a and the outer member 2 in a state of being in close contact with the inner peripheral surface of the end portion of the outer member 2. Therefore, it is possible to reliably prevent foreign matters such as rainwater and dust from entering the inside of the bearing from the fitting portion between the protective cover 10 and the outer member 2.

  In addition, since the protective cover 10 is formed from a general-purpose cold-rolled steel plate by press working, the workability in press forming is good, a complicated shape can be accurately formed at low cost, and the inclination is inclined. The strength and rigidity of the protective cover 10 are increased by the stepped shape such as the stepped portion 10c and the stepped portion 10e, and deformation due to collision of flying stones or the like can be suppressed. Further, since the fitting portion 10a is press-fitted until it abuts against the step portion 2d of the outer member 2, the positioning accuracy of the protective cover 10 with respect to the outer member 2 can be increased, and reliability is ensured by accurate air gap adjustment. High speed detection can be performed.

  Even if the protective cover 10 is formed of a magnetic material, the through hole 14 is formed at a position corresponding to the detection portion of the sensor, and the outer surface of the protective cover 10 is covered with the rubber member 15. It has excellent corrosion resistance, can be sealed, and can prevent rusting over a long period of time, improving strength and durability, and does not adversely affect the sensing performance of the sensor.

  Further, the number of the through holes 14 may be one, but in this embodiment, as shown in FIG. 4, a plurality of the through holes 14 are arranged in the circumferential direction of the shielding portion 10b in the protective cover 10 (three in this case). Is formed. Thereby, when positioning and fixing the protective cover 10 to the outer member 2 in a state where the phases are aligned, the phase alignment is completed in a short time, and workability is improved. Of course, if the number of the through holes 17 is not limited to three but increases, workability can be further improved.

  FIG. 5 is a longitudinal sectional view showing a second embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 6 is a side view of FIG. 5, and FIG. 7 (a) is a modification of FIG. The partial side view which shows an example, (b) is a partial side view which shows the modification of (a). This embodiment is basically the same as the first embodiment (FIG. 1) described above except that the configuration of the protective cover is different, and the other parts are the same parts or the same function as the previous embodiment. Are given the same reference numerals and their detailed description is omitted.

  A protective cover 16 is attached to the inner side end of the outer member 2. The protective cover 16 is formed in a substantially cup shape by press working from a cold rolled steel plate made of JIS standard SPCD, press-fitted into the inner periphery of the end of the outer member 2, and positioned on the step 2 c of the outer member 2. A cylindrical fitting portion 10a, a disc-shaped shielding portion 10b extending radially inward from the fitting portion 10a, and an inner side of the inner member 1 from the shielding portion 10b via an inclined portion 10c. And a bottom portion 10d that closes the end portion. A stepped portion 16 a that bulges into the recess 7 a of the caulking portion 7 is formed at the center of the bottom portion 10 d. Since the stepped portion 16a is formed in a substantially rectangular cross section along the shape of the recess 7a of the crimping portion 7, the strength and rigidity of the protective cover 16 are further increased.

  Here, in this embodiment, as shown in FIG. 6, the eyebrows-shaped through-hole 17 is formed by punching at a position corresponding to the sensor detection portion (not shown) of the shielding portion 10 b in the protective cover 16. Yes. Two through holes 17 are formed at 180 ° symmetrical positions. Thereby, when positioning and fixing the protective cover 16 to the outer member 2 in a phase-matched state, the phase alignment is completed in a short time, workability is improved, and the circumferential direction of the protective cover 16 with respect to the sensor is improved. Even if there is an error in positioning accuracy, it can be tolerated.

  FIG. 7A shows a modification. In this embodiment, the outer surface of the protective cover 16 is covered with the rubber member 118, but a triangular mark M <b> 1 is formed at a position corresponding to the through hole 14 on the outer surface of the rubber member 18. Thereby, even if the through hole 17 of the protective cover 16 cannot be visually observed by the rubber member 18, the protective cover 16 can be easily positioned and fixed to the outer member 2. Further, the shape of the mark M1 is not limited to a triangle, but may be a mark M2 made of a circle as shown in FIG.

  Fig.8 (a) is a principal part enlarged view which shows 3rd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus concerning this invention, (b) is a VIII arrow directional view of (a). This embodiment is basically the same as the above-described second embodiment (FIG. 5) except that the rubber member configuration is partially different, and the other parts have the same parts and the same functions as the above-described embodiment. Parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the outer surface of the protective cover 16 is covered with the rubber member 19, but in the position corresponding to the through hole 17 on the outer surface of the rubber member 19, an eyebrow shape that is substantially the same as the shape of the through hole 17. The convex part 20 which makes is formed. Then, a detection portion (not shown) of the sensor is brought close to or in contact with the convex portion 20, and the detection portion and the magnetic encoder 13 are arranged to face each other with a predetermined air gap via the rubber member 19. Since the rubber member 19 is a non-magnetic material, it does not affect the flow path of the magnetic flux, and there is no problem of a decrease in accuracy of rotation speed detection by the sensor. Thereby, even if the through hole 17 of the protective cover 16 cannot be seen by the rubber member 19, the protective cover 16 can be easily positioned and fixed to the outer member 2, and the air gap can be set small. The magnetic output becomes stronger and stable detection accuracy can be ensured.

  Fig.9 (a) is a principal part enlarged view which shows 4th Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus concerning this invention, (b) is IX arrow directional view of (a). This embodiment is basically the same as the first embodiment (FIG. 2) described above except that the configuration of the rubber member is only partially different, and the other parts have the same parts and the same functions as the embodiment described above. Parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the outer surface of the protective cover 10 is covered with the rubber member 21, but protrusions 22 are formed on both sides of the outer surface of the rubber member 21 corresponding to the through holes 14. The protrusion 22 allows the protective cover 10 to be easily positioned and fixed to the outer member 2 even when the rubber member 21 does not allow the through-hole 14 of the protective cover 10 to be seen, and the range of the through-hole 14 can be easily set. The sensor can be easily assembled and adjusted simply by aligning the detection portion (not shown) of the sensor between the protrusions 22 and 22.

  FIG. 10A is an enlarged view of a main part showing a fifth embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 10B is a view taken in the direction of the arrow X in FIG. This embodiment is basically the same as the above-described second embodiment (FIG. 5) except that the configuration of the rubber member is partially different, and other parts having the same parts or the same functions as the above-described embodiments. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the outer surface of the protective cover 16 is covered with the rubber member 23, but in the position corresponding to the through hole 17 on the outer surface of the rubber member 23, an eyebrow shape that is substantially the same as the shape of the through hole 17. A recess 24 is formed. A sensor detection unit (not shown) is brought close to or in contact with the recess 24, and the detection unit and the magnetic encoder 13 are arranged to face each other with a predetermined air gap through the rubber member 23. Since the rubber member 23 is a non-magnetic material, it does not affect the flow path of the magnetic flux, and there is no problem of a decrease in accuracy of rotation speed detection by the sensor. Thus, the protective cover 16 can be easily positioned and fixed to the outer member 2 even if the through hole 17 of the protective cover 16 cannot be visually observed by the rubber member 23, and the air gap is reduced by the amount of the recess 24. Therefore, the magnetic output becomes strong and stable detection accuracy can be ensured.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device with a rotational speed detection device according to the present invention can be applied to a wheel bearing device having a first to third generation structure having an inner ring rotating structure.

1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotation speed detection device according to the present invention. It is a principal part enlarged view which shows the detection part of FIG. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. It is a side view of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. FIG. 6 is a side view of FIG. 5. (A) is a partial side view which shows the modification of FIG. (B) is a partial side view which shows the modification of (a). (A) is a principal part enlarged view which shows 3rd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. (B) is a VIII arrow directional view of (a). (A) is a principal part enlarged view which shows 4th Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. (B) is a IX arrow line view of (a). (A) is a principal part enlarged view which shows 5th Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. (B) is a X arrow view of (a). It is a principal part enlarged view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1 .... Inner member 2 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 2b ・ ・ ・ ・ ・ ・Car body mounting flange 2c ... Step part 3 ... Rolling element 4 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 4a, 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 4b ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Inner ring 6 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・..... Inner side base 7 ... ·················· 7 ····················································· ...... 16 ... protective cover 10a ...・ ・ Fitting part 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shielding part 10c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Inclined part 10d ... Bottom 10e, 16a ... .... Stepped part 11 ... Pulsar ring 12 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Support Ring 12a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder Part 12b ... Standing plate part 13 ... .... Magnetic encoders 14 and 17 ... Through holes 15, 18, 19, 21, 23 ... ... rubber member 15a ......... seal part 20・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Projection 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Protrusions 24 ... Recesses 50 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 50a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 50b ・ ・ ・Car body mounting flange 51 ... Inner member 52 ... ball 53 ...・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 53a, 54a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 53b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 53c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping section 54 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 55a ... Base 56 ...・ ・ ・ ・ Seal ring 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Support ring 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder main body 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Blocking plate part 62 ... fitting part 63 ... Sensor 64 ... Detector 65 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Screw M1, M2 ······················mark

Claims (13)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed movably between the rolling surfaces of the inner member and the outer member;
A pulsar ring fitted on the inner ring,
A seal is attached to the outer end of the outer member,
In the wheel bearing device with a rotational speed detecting device, a protective cover is attached to an inner side end of the outer member, and an opening of an annular space formed by the outer member and the inner member is sealed.
The protective cover is formed in a substantially cup shape by pressing from a cold rolled steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the inner periphery of the end of the outer member, and radially inward from the fitting portion. A disc-shaped shielding part extending from the shielding part and a bottom part closing the inner side end of the inner member through an inclined part, and the protective cover is formed on the inner periphery of the end part of the outer member. And a through hole is formed at a position corresponding to the detection part of the sensor of the shielding part, and the exposed outer surface of the protective cover is covered with a rubber member. The wheel bearing device with a rotational speed detecting device is characterized in that the detecting portions of the sensor are arranged to face each other with a predetermined air gap through the rubber member.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein the through hole is set to have a dimension exceeding a span in which the characteristics of the pulsar ring change.   The wheel bearing device with a rotation speed detection device according to claim 1 or 2, wherein the through hole is formed in an eyebrow shape.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 3, wherein a plurality of the through holes are formed in a circumferentially uniform manner.   The pulsar ring is integrally joined to a side surface of the support plate having a cylindrical portion press-fitted into the outer diameter of the inner ring, and a vertical plate portion extending radially outward from the cylindrical portion. And the support ring is formed by pressing a ferromagnetic steel plate, and the magnetic encoder is mixed with magnetic powder in a synthetic rubber, and magnetic poles are alternately spaced at equal pitches in the circumferential direction. The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 4, wherein N and S are magnetized.   6. A recess is formed at an inner side end of the hub wheel, and a stepped portion that bulges into the recess is formed at the center of the bottom of the protective cover. The bearing apparatus for wheels with a rotational speed detection apparatus of description.   The wheel bearing device with a rotational speed detection device according to claim 6, wherein the stepped portion is formed in a substantially rectangular cross section along the shape of the recess.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 7, wherein the protective cover is made of a magnetic material, and a plate thickness thereof is set in a range of 0.4 to 0.8 mm.   The wheel with a rotational speed detection device according to any one of claims 1 to 8, wherein a seal portion is formed at an outermost diameter portion of the rubber member so as to protrude from the outer diameter side of the fitting portion of the protective cover. Bearing device.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 9, wherein a predetermined mark is formed at a position corresponding to the through hole on the outer surface of the rubber member.   A convex portion having a shape substantially the same as the shape of the through hole is formed at a position corresponding to the through hole on the outer surface of the rubber member, and the detection portion of the sensor is in proximity to or in contact with the convex portion. The wheel bearing apparatus with a rotational speed detection apparatus in any one of Claims 1 thru | or 9.   A recess having substantially the same shape as the shape of the through hole is formed at a position corresponding to the through hole on the outer surface of the rubber member, and the detection portion of the sensor is in proximity to or in contact with the recess. A bearing device for a wheel with a rotation speed detection device according to any one of 1 to 9.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 12, wherein protrusions are formed on both sides of the outer surface of the rubber member corresponding to the through hole.

Images