JP4726042B2 - Wheel bearing device with rotation speed detector - Google Patents

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.

  A wheel equipped with a rotational speed detection device that rotatably supports an automobile wheel with respect to a suspension device and that has a built-in rotational speed detection device for controlling the anti-lock brake system (ABS) by detecting the rotational speed of the wheel. Bearing devices for automobiles 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. In addition, the rotational speed detecting device is constituted by a magnetic encoder and a rotational speed sensor that is arranged facing the magnetic encoder and detects a magnetic pole change of the magnetic encoder accompanying the rotation of the wheel.

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of the air gap adjustment work between the rotation speed sensor and the magnetic encoder and to achieve further compactness, recently, a bearing apparatus for a wheel with a rotation speed detection device in which the rotation speed sensor is also incorporated in the bearing. Has been proposed.

  A structure as shown in FIG. 5 is known as an example of such a wheel bearing device with a rotational speed detection device. This wheel bearing device with a rotational speed detection device is supported and fixed to a knuckle (not shown), and is inserted into the outer member 61 serving as a fixing member, and the outer member 61 via double-row rolling elements 63 and 63. And an inward member 62.

  The outer member 61 integrally has a vehicle body mounting flange 61b for fixing to the knuckle on the outer periphery, and double row outer rolling surfaces 61a, 61a are formed on the inner periphery. On the other hand, the inner member 62 is formed with double-row inner rolling surfaces 65a and 66a facing the outer rolling surfaces 61a and 61a of the outer member 61 described above. Of these double row inner rolling surfaces 65 a and 66 a, one inner rolling surface 65 a is integrally formed on the outer periphery of the hub wheel 65, and the other inner rolling surface 66 a is formed on the outer periphery of the inner ring 66. The inner ring 66 is press-fitted into a cylindrical small-diameter step portion 65b extending in the axial direction from the inner rolling surface 65a of the hub wheel 65. And the double row rolling elements 63 and 63 are accommodated between these both rolling surfaces, respectively, and are hold | maintained by the holder | retainers 67 and 67 so that rolling is possible.

  The hub wheel 65 integrally has a wheel mounting flange 64 for mounting a wheel (not shown) on the outer periphery, and a hub bolt 64a for fixing the wheel is planted at a circumferentially equidistant position of the wheel mounting flange 64. It is installed. A serration 65c is formed on the inner periphery of the hub wheel 65, and a stem portion 71 of an outer joint member 70 constituting a constant velocity universal joint (not shown) is fitted therein. The inner member 62 refers to the hub ring 65 and the inner ring 66. Seals 68 and 69 are attached to the end portion of the outer member 61 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, and the like from the outside into the bearing.

  As shown in an enlarged view in FIG. 6, the inboard side seal 69 is fitted into the inner periphery of the end of the outer member 61 and has a first seal plate 72 formed in an L-shaped cross section, and the first seal plate 72. And a second seal plate 73 having an L-shaped cross section. The second seal plate 73 includes a cylindrical portion 73a that is externally fitted to the inner ring 66, and a standing plate portion 73b that extends radially outward from the cylindrical portion 73a. A magnetic encoder 74 made of a rubber magnet in which magnetic powder is mixed and magnetic poles N and S are alternately formed in the circumferential direction is integrally vulcanized and bonded to the outer surface of the standing plate portion 73b.

  On the other hand, the first seal plate 72 is a cored bar 75 having an L-shaped cross section and is integrally vulcanized and bonded to the cored bar 75, and the inner surface of the upright plate portion 73 b in the second seal plate 73. And a seal member 76 including a pair of radial lips 76b and 76c in sliding contact with the cylindrical portion 73a.

  An annular sensor holder 79 including a fitting cylinder 77 and a holding part 78 coupled to the fitting cylinder 77 is attached to the end of the outer member 61. The fitting cylinder 77 includes a fitting cylinder part 77a and an inward flange part 77b extending radially inward from the fitting cylinder part 77a, and is formed in an annular shape as a whole with an L-shaped cross section.

  The holding portion 78 is embedded therein with a rotational speed sensor 80 that faces the magnetic encoder 74 via a predetermined air gap, and is integrally molded in a circular arc shape with a synthetic resin. The rotation speed sensor 80 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detecting element. It consists of IC.

Here, the labyrinth seal is configured by causing the end face of the inner ring 66 and the inward flange portion 77b of the fitting cylinder 77 to closely face each other through the minute gap 81. Accordingly, the magnetic encoder 74 and the rotational speed sensor 80 can be connected to each other even before the stem portion 71 of the outer joint member 70 is fitted to the inner diameter of the hub wheel 65, including when being transported to the assembly line of the automobile finished product manufacturer. It is possible to prevent foreign matter such as magnetic powder from entering between the detection unit and the outside. Therefore, it is possible to improve the reliability of wheel rotation speed detection.
JP 2003-254985 A

  Such a conventional wheel bearing device with a rotational speed detection device is in a state before the stem portion 71 of the outer joint member 70 is fitted to the inner diameter of the hub wheel 65, including when it is transported to the assembly line of a finished vehicle manufacturer. However, the fitting cylinder 77 is provided with an end portion of the outer member 61 that has a feature that can prevent foreign matter such as magnetic powder from entering between the magnetic encoder 74 and the detection portion of the rotation speed sensor 80 from the outside. There is a possibility that the sensor holder 79 moves in the axial direction only by being press-fitted and fixed to. That is, in this type of wheel bearing device, various vibrations are generated during traveling, and the outer member 61 is repeatedly deformed by a load applied thereto. There is a possibility that the air gap between the encoder 74 and the detection unit of the rotation speed sensor 80 may be broken. Thereby, not only the reliability of detecting the rotational speed of the wheel is lowered, but also the sensor holder 79 may fall off the outer member 61 during long-term use.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device with a rotation speed detection device that maintains the reliability of wheel rotation speed detection over a long period of time. .

In order to achieve such an object, the invention according to claim 1 of the present invention is an outer body in which a vehicle body mounting flange for mounting to a knuckle is integrally formed on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. And a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end thereof and having a small-diameter step portion extending in the axial direction on the outer periphery, and an 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, and between the rolling surfaces of the inner member and the outer member. A double row rolling element accommodated in a freely rolling manner, a sensor holder attached to an end portion of the outer member and having a rotational speed sensor, and externally fitted to the inner ring, and having a predetermined air gap in the rotational speed sensor With a magnetic encoder arranged axially opposite And the rotational speed detector equipped wheel support bearing assembly, the outer peripheral surface of the inboard side than the vehicle body mounting flange of the outer member, and a step portion outboard side is the inboard side and small at the larger diameter, the inner circumference of said knuckle On the surface, each step is formed with a large diameter on the outboard side and a small diameter on the inboard side, and the outer peripheral surface on the large diameter side of the outer member is fitted to the inner peripheral surface on the large diameter side of the knuckle, The sensor holder includes a fitting portion that is externally fitted to an end portion on the inboard side of the outer member, a flange portion that extends radially inward from the fitting portion, and a bottom portion that extends in an axial direction from the flange portion. A cover made of a steel plate and a synthetic resin holding part that is coupled to the bottom of the cover and in which the rotational speed sensor is embedded, and is radially outward at the tip of the fitting part in the cover When a locking piece extending to The locking piece in the elastic member is bonded by vulcanization integrally the cover relative to the outer member by elastic contact in the axial direction surface of the stepped portion of the knuckle is prevented from moving in the axial direction Yes.

Thus, a sensor holder that is attached to the end portion of the outer member and has a rotational speed sensor, a magnetic encoder that is externally fitted to the inner ring and is disposed opposite to the rotational speed sensor in the axial direction via a predetermined air gap. In the inner ring rotation type wheel bearing device with a rotational speed detection device , a stepped portion having a large diameter on the outboard side and a small diameter on the inboard side on the outer peripheral surface on the inboard side from the body mounting flange of the outer member, On the inner peripheral surface of the knuckle, a step portion having a large diameter on the outboard side and a small diameter on the inboard side is formed, and the inner peripheral surface on the large diameter side of the knuckle is fitted to the outer peripheral surface on the large diameter side of the outer member. In addition, the sensor holder includes a fitting portion that is externally fitted to an end portion on the inboard side of the outer member, a flange portion that extends radially inward from the fitting portion, and an axial direction that extends from the flange portion. Made of steel plate with bottom A cover and a synthetic resin holding part that is coupled to the bottom part of the cover and in which the rotation speed sensor is embedded are formed, and a locking piece that extends radially outward is formed at the tip part of the fitting part of the cover. In addition, the elastic member is integrally vulcanized and bonded to the locking piece, and the cover is prevented from moving in the axial direction with respect to the outer member by elastically contacting the axial surface of the step portion of the knuckle. Even if vibration is generated during traveling of the vehicle, or even when a large load is applied to the outer member and it is repeatedly deformed into an elliptical shape, the cover does not move relative to the outer member. Therefore, the air gap between the magnetic encoder and the detection unit of the rotational speed sensor can be maintained in an initially set state for a long period of time, and the reliability of detecting the rotational speed of the wheel is improved.

In the invention according to claim 2 , if the cover is formed of a non-magnetic steel plate, the detection accuracy of the rotational speed sensor is not adversely affected, and the detection accuracy can be improved.

A wheel bearing device with a rotational speed detection device according to the present invention integrally has a vehicle body mounting flange for mounting to a knuckle on the outer periphery, and an outer member having a double row outer rolling surface formed on the inner periphery, It has a wheel mounting flange for mounting a wheel at one end, and a hub wheel formed with a small-diameter step portion extending in the axial direction on the outer periphery, and an inner ring press-fitted into the small-diameter step portion of this hub wheel, An inner member having a double row inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and freely rollable between the rolling surfaces of the inner member and the outer member. The accommodated double row rolling elements, a sensor holder attached to the end of the outer member and having a rotational speed sensor, and externally fitted to the inner ring, and a shaft connected to the rotational speed sensor via a predetermined air gap With a magnetic encoder arranged oppositely in the direction In the speed detector equipped wheel support bearing assembly, the outer peripheral surface of the outer inboard side than the vehicle body mounting flange of the member, and a step portion outboard side is the inboard side and small at the larger diameter, the inner peripheral surface of the knuckle A step portion having a large diameter on the outboard side and a small diameter on the inboard side is formed, and the inner peripheral surface on the large diameter side of the knuckle is fitted to the outer peripheral surface on the large diameter side of the outer member, and the sensor The holder includes a fitting portion that is fitted on the inboard side end of the outer member, a flange portion that extends radially inward from the fitting portion, and a bottom portion that extends in the axial direction from the flange portion. A steel plate cover and a synthetic resin holding portion which is coupled to the bottom portion of the cover and in which the rotational speed sensor is embedded, and extends radially outward at a distal end portion of the fitting portion of the cover. A locking piece is formed and Engaging piece elastic member is bonded by vulcanization integrally with, since the cover relative to the outer member by elastic contact in the axial direction surface of the stepped portion of the knuckle is prevented from moving in the axial direction, the vehicle Even if vibration is generated during traveling, a large load is applied to the outer member, and the cover does not move relative to the outer member even if the outer member is repeatedly deformed into an elliptical shape. Therefore, the air gap between the magnetic encoder and the detection unit of the rotational speed sensor can be maintained in an initially set state for a long period of time, and the reliability of detecting the rotational speed of the wheel is improved.

A body mounting flange for mounting to the knuckle on the outer periphery is integrated, an outer member with a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end are integrated. And a hub wheel having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and the hub wheel. An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and is formed with the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the inner member and the outer member. A double row rolling element housed in a freely rolling manner between the respective rolling surfaces, a sensor holder attached to an end of the outer member and having a rotational speed sensor, and an outer fit to the inner ring and the rotation Magnets that are axially opposed to the speed sensor through a predetermined air gap In the rotational speed detector equipped wheel support bearing assembly equipped with an encoder, the outer peripheral surface of the inboard side than the vehicle body mounting flange of the outer member, and a step portion outboard side is the inboard side and small at the larger diameter, the On the inner peripheral surface of the knuckle, a step portion having a large diameter on the outboard side and a small diameter on the inboard side is formed, and the inner peripheral surface on the large diameter side of the knuckle is fitted on the outer peripheral surface on the large diameter side of the outer member. The sensor holder includes a fitting portion that is externally fitted to an end portion on the inboard side of the outer member, a flange portion that extends radially inward from the fitting portion, and a shaft that extends from the flange portion. A steel plate cover having a bottom portion extending in a direction, and a synthetic resin holding portion that is coupled to the bottom portion of the cover and in which the rotation speed sensor is embedded. Locking extending radially outward Together but are formed, the engaging piece in the elastic member is bonded by vulcanization integrally with the elastic contacts to the axial face of the stepped portion of the knuckle, the cover is moved axially relative to the outer member Was prevented.

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 the main part of FIG. 1, and FIG. it is a fragmentary cross-sectional view showing a Sensahoru da according to the present invention. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

  This wheel bearing device with a rotational speed detection device is called a third generation for driving wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements (balls) on the inner member 3. 4 and 4 and an outer member 5 that is inserted through 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outboard side, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. ing. Further, on the outer periphery, an inner rolling surface 1a on the outboard side and a cylindrical small diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed. An inner ring 2 having an inboard-side inner rolling surface 2a formed on the outer periphery thereof is press-fitted into the small-diameter step portion 1b via a predetermined shimiro.

  The outer member 5 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a vehicle body mounting flange 5b integrally attached to the knuckle N constituting the suspension device on the outer periphery. Double rows of outer rolling surfaces 5a and 5a facing the double rows of inner rolling surfaces 1a and 2a of the inner member 3 are integrally formed on the periphery. These outer rolling surfaces 5a and 5a are hardened by induction hardening to a surface hardness of 58 to 64 HRC. Between the outer rolling surfaces 5a and 5a of the outer member 5 and the double row inner rolling surfaces 1a and 2a of the inner member 3 facing these, the double row rolling elements 4 and 4 are accommodated, respectively. The cages 7 and 7 are held so as to freely roll. Further, seals 8 and 9 are attached to the end portion of the outer member 5 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside.

  The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the seal land portion where the seal 8 on the outboard side is in sliding contact to the inner rolling surface 1a and the small diameter step portion 1b. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. As a result, the seal land as the base of the wheel mounting flange 6 not only has improved wear resistance, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 6. The durability of 1 is further improved. On the other hand, the inner ring 2 is made of high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core portion by quenching.

  A serration (or spline) 1c is formed on the inner periphery of the hub wheel 1, and an outer joint member 11 constituting the constant velocity universal joint 10 is fitted therein. The outer joint member 11 is integrally provided with a cup-shaped mouth portion 12, a shoulder portion 13 that forms the bottom portion of the mouth portion 12, and a stem portion 14 that extends from the shoulder portion 13 in the axial direction.

  A serration (or spline) 14 a is formed on the outer periphery of the stem portion 14 and is engaged with the serration 1 c of the hub wheel 1. The outer joint member 11 has a shoulder portion 13 abutted against the inner ring 2, and the hub wheel 1 and the outer joint member 12 are detachably coupled to each other in the axial direction by a fixing nut 15. The base portion of the stem portion 14 is fitted into the small diameter step portion 1b of the hub wheel 1 through a predetermined radial clearance. As a result, the end portion of the hub wheel 1 is cylindrically supported by the stem portion 14, so that the rigidity of the hub wheel 1 is increased and the durability is further improved. In addition, although the double row angular contact ball bearing which used the rolling elements 4 and 4 as a ball | bowl was illustrated here, it is not restricted to this, The double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient.

  In the present embodiment, the sensor holder 16 is attached to the end of the outer member 5 on the inboard side. As shown in an enlarged view in FIG. 2, the sensor holder 16 includes a cover 17 having a cup-shaped cross section and a holding portion 18 coupled to the cover 17. The cover 17 has a cylindrical fitting portion 17a fitted on the end of the outer member 5, a flange portion 17b extending radially inward from the fitting portion 17a, and an axial direction extending from the flange portion 17b. It consists of a bottom 17c. The fitting portion 17 a is externally fitted to the end portion of the outer member 5 with the flange portion 17 b of the cover 17 being in close contact with the end surface of the outer member 5. Thereby, the sensor holder 16 can be positioned and fixed accurately and easily with respect to the outer member 5, and the rotational speed of the wheel can be detected with high accuracy.

  A circular hole 17d is formed in the bottom portion 17c of the cover 17, and the shoulder portion 13 of the outer joint member 11 is fitted and inserted through a slight radial clearance to constitute a labyrinth seal 25. The cover 17 is formed by pressing a corrosion-resistant stainless steel plate or the like. In particular, the cover 17 is formed of a non-magnetic steel plate, such as an austenitic stainless steel plate (JIS standard SUS304, etc.) so as not to adversely affect the sensing performance of the rotational speed sensor 19 described later. Is preferred.

  The holding part 18 is formed by injection-molding synthetic resin, the rotation speed sensor 19 is embedded inside, and the harness 18a is integrally connected. Then, the cover 17 is elastically mounted in one touch from a notch (not shown) formed at one location radially outward of the bottom 17c. The holding portion 18 may be integrally coupled to the cover 17 by injection molding, or may be formed in an annular shape so as to be fitted to the bottom portion 17 c of the cover 17. The rotational speed sensor 19 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detecting element. It consists of IC.

  On the other hand, a slinger 20 is press-fitted into the outer diameter of the inner ring 2 and is disposed opposite to the holding portion 18 in the axial direction. The slinger 20 forms a seal 9 on the inboard side, and includes a cylindrical portion 20a that is press-fitted into the inner ring 2, and a standing plate portion 20b that extends radially outward from the cylindrical portion 20a. The slinger 20 is made of 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). Are formed into a substantially L-shaped cross section by pressing.

  A magnetic encoder 21 in which a magnetic substance powder such as ferrite is mixed in an elastomer such as rubber is integrally vulcanized and bonded to a side surface on the inboard side of the standing plate portion 20 b in the slinger 20. The magnetic encoder 21 is magnetized with magnetic poles N and S alternately in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel. In this example, the magnetic encoder 21 is made of an elastomer. However, the invention is not limited to this. For example, the magnetic encoder 21 may be made of sintered metal obtained by hardening a ferromagnetic powder made of ferrite or the like with a metal binder.

  The inboard-side seal 9 includes the slinger 20 and an annular seal plate 22 mounted on the outer member 5 so as to face the slinger 20 and having a substantially L-shaped cross section. The seal plate 22 includes a cored bar 23 composed of a cylindrical part 23a fitted into the end of the outer member 5, and a standing plate part 23b extending radially inward from one end of the cylindrical part 23a. The seal member 24 is vulcanized and bonded to the gold 23. The metal core 23 is formed by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like).

  The seal member 24 is made of an elastic member such as rubber, and includes a side lip 24a that is in sliding contact with the standing plate portion 20b of the slinger 20, and a grease lip 24b and an intermediate lip 24c that are in sliding contact with the cylindrical portion 20a. Further, the outer edge of the standing plate portion 20 b of the slinger 20 faces the cylindrical portion 23 a of the core metal 23 through a slight radial clearance to form a labyrinth seal 26.

  In this embodiment, the seal 9 on the inboard side and the sensor holder 16 are arranged to face each other in the axial direction, and the magnetic encoder 21 is integrally joined to the slinger 20 constituting the seal 9, and the holding portion constituting the sensor holder 16. A rotational speed sensor 19 is embedded in 18, and this rotational speed sensor 19 is disposed opposite to the magnetic encoder 21 via an axial gap (air gap). The output of the rotational speed sensor 19 is taken out by the harness 18a and sent to an ABS controller (not shown). Here, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 21 and the rotational speed sensor 19 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection according to the present invention is illustrated. The apparatus is not limited to this, and may be, for example, a passive type including a magnetic encoder, a magnet, and an annular coil wound around.

  Here, a locking piece 27 extending outward in the radial direction is formed at the distal end portion of the fitting portion 17 a in the cover 17. The locking piece 27 is engaged with the step portion 28 of the knuckle N via a predetermined axial clearance. As a result, even if vibration is generated when the vehicle travels, or even when a large load is applied to the outer member 5 and it is repeatedly deformed into an elliptical shape, the cover 17 does not move relative to the outer member 5. . Therefore, the air gap between the magnetic encoder 21 and the detection unit of the rotation speed sensor 19 can be maintained in an initially set state over a long period of time, and the reliability of wheel rotation speed detection is improved. The axial clearance between the locking piece 27 of the cover 17 and the stepped portion 28 of the knuckle N is set to be within an air gap that can be detected by the rotational speed sensor 19. Thereby, malfunction / non-operation of the ABS system can be prevented. In the present embodiment, the wheel bearing device on the driving wheel side is exemplified, but it is needless to say that the wheel bearing device on the driven wheel side may be used as long as it is an inner ring rotating structure.

  FIG. 3 shows a modified example of the sensor holder 16 described above, but this sensor holder 29 is different in the configuration of the fitting portion 17a of the cover 17 in the sensor holder 16 described above, except for the same parts and the same. Parts are assigned the same reference numerals to avoid redundant explanation.

  The sensor holder 29 includes a cover 17 having a cup-shaped cross section and a holding unit 18 coupled to the cover 17. The cover 17 includes a cylindrical fitting portion 17a that is press-fitted into the outer periphery of the outer member 5, a flange portion 17b that extends radially inward from the fitting portion 17a, and a bottom portion that extends in an axial direction from the flange portion 17b. 17c. Here, a locking piece 27 extending radially outward is formed at the tip of the fitting portion 17a, and an elastic member 30 such as rubber is integrally vulcanized and bonded to the locking piece 27. . The elastic member 30 elastically contacts the stepped portion 28 of the knuckle N to prevent rainwater and dust from entering the inside, and the cover 17 slightly moves in the axial direction with respect to the outer member 5. Is preventing.

FIG. 4 is an enlarged view of a main part of a wheel bearing device with a rotational speed detection device according to the present invention for reference . Note that the present embodiment is different from the first embodiment described above only in the configuration of the sensor holder, and other parts that are the same, the same part, or the same function are denoted by the same reference numerals and detailed description thereof is omitted. .

  Also in the present embodiment, the sensor holder 31 is mounted on the end portion on the inboard side of the outer member 5 ′, and includes a cover 32 having a cup-shaped cross section and a holding portion 18 coupled to the cover 32. . The cover 32 has a cylindrical fitting portion 32a fitted over the end of the outer member 5 ', a flange portion 17b extending radially inward from the fitting portion 32a, and an axial direction from the flange portion 17b. The bottom portion 17c extends. Then, with the flange portion 17b of the cover 32 in close contact with the end surface of the outer member 5, the fitting portion 32a is fitted over the side surface of the vehicle body mounting flange 5b from the end portion of the outer member 5 ′. Yes. In this case, the fitting portion 32a of the cover 17 becomes an in-row portion of the knuckle N, and the knuckle N is extrapolated while being guided by the fitting portion 32a. Therefore, the length of the inrow portion can be set larger than that of the first embodiment in which the outer peripheral surface of the outer member 5 ′ is the inrow portion, and foreign matter such as rainwater and dust from the outside is fitted into the fitting portion 32 a. Intrusion into the bearing through can be reliably prevented.

  Here, a locking piece 33 extending outward in the radial direction is formed at the distal end of the fitting portion 32 a in the cover 32. The locking piece 33 is accommodated in the stealing portion 34 of the outer member 5 ′ and engages with the end surface of the knuckle N via a predetermined axial clearance. Thereby, the step portion of the knuckle as in the above-described embodiment is not necessary, and even when vibration is generated during traveling of the vehicle, a large load is applied to the outer member 5 ′, and it is repeatedly deformed into an elliptical shape. However, the cover 32 does not move relative to the outer member 5 ′. The axial clearance between the locking piece 33 of the cover 32 and the end surface of the knuckle N is set so as to be within an air gap that can be detected by the rotational speed sensor 19 to prevent malfunction and non-operation of the ABS system. Can do.

  In addition, here, the stealing portion 34 is formed in the outer member 5 ′, and the structure in which the locking piece 33 of the cover 32 is accommodated in the stealing portion 34 is exemplified, but of course, as in the above-described embodiment, Although not shown, a stepped portion may be formed on the end surface of the knuckle, and a locking piece may be engaged with the stepped portion.

  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 is applied to a wheel bearing device in which any type of rotational speed detection device is incorporated in the inner ring rotation structure regardless of the driven wheel side or the drive wheel side. Can do.

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. Supra, shown in reference enlarged view. Is an enlarged view showing a Sensahoru da according to the present invention. It shows with reference in the principal part enlarged view of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention . It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus. It is a principal part enlarged view same as the above.

Explanation of symbols

1 ... hub wheel 1a, 2a ... inner rolling surface 1b ... small diameter step 1c ... serration 2 ... ..... Inner ring 3 ... Inner member 4 ... Rolling elements 5, 5 '... Outer member 5a ... ··· Outer rolling surface 5b ··· Body mounting flange 6 ··· Wheel mounting flange 6a ··· Hub hub 7 ··· ··························································································································· ······· Outer joint member 12 ······· Mouse portion 13 ··· Shoulder portion 14 ··· Stem portion 15 ··· ..Fixing nuts 16, 29, 31 17, 32... Cover 17a, 32a... Fitting portion 17b... 鍔 portion 17c. ..... holding part 18a ..... harness 19 .......... rotational speed sensor 20 ..... slinger 20a, 23a ... cylindrical part 20b, 23b ... Standing plate part 21 ... Magnetic encoder 22 ... Seal plate 23 ... Core metal 24 ... Seal member 24a... Side lip 24b... Grease lip 24c... Intermediate lips 25 and 26. Labyrinth seals 27 and 33. Piece 28 ... Stepped portion 30 ... Elastic member 34 ... Stealing portion 61 ... Directional member 61a ··· Outer rolling surface 61b ··· Body mounting flange 62 ··· Inner member 63 ··· Rolling element 64 ··· ..... Wheel mounting flange 64a ..... Hub bolt 65 ..... Hub wheel 65a, 66a ... Inner rolling surface 65b ..... Small diameter step. 65c ··· Serration 66 ··· Inner ring 67 · · · Retainer 68, 69 · · · Seal 70 · · · Outer Joint member 71 ... stem 72 ... first seal plate 73 ... second seal plate 73a ... cylinder Portion 73b ... Standing plate 74 ... Magnetic encoder 75 ... Core metal 76 ... Seal member 76a ... ... Side lips 76b, 76c ... Radial lip 77 ... Fitting cylinder 77a ... Fitting cylinder part 77b ... Inward flange part 78- ········ Holding part 79 ················································ Rotational speed sensor 81 ···knuckle

Claims (2)

An outer member integrally having a vehicle body mounting flange for attaching to a knuckle on the outer periphery, and a double row outer rolling surface formed on the inner periphery;
It has a wheel mounting flange for mounting a wheel at one end, and a hub wheel formed with a small-diameter step portion extending in the axial direction on the outer periphery, and an inner ring press-fitted into the small-diameter step portion of this hub wheel, An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
A sensor holder attached to an end of the outer member and having a rotational speed sensor;
In a wheel bearing device with a rotational speed detection device, comprising: a magnetic encoder that is externally fitted to the inner ring and is disposed opposite to the rotational speed sensor in the axial direction via a predetermined air gap;
On the outer peripheral surface on the inboard side from the vehicle body mounting flange of the outer member, a stepped portion having a large diameter on the outboard side and a small diameter on the inboard side, and an inner peripheral surface of the knuckle, a large diameter on the outboard side and an inboard side on the inboard side Forming a step portion to be a small diameter, and fitting the inner peripheral surface on the large diameter side of the knuckle to the outer peripheral surface on the large diameter side of the outer member;
The sensor holder includes a fitting portion that is externally fitted to an end portion on the inboard side of the outer member, a flange portion that extends radially inward from the fitting portion, and a bottom portion that extends in an axial direction from the flange portion. A cover made of a steel plate and a synthetic resin holding part that is coupled to the bottom of the cover and in which the rotational speed sensor is embedded, and is radially outward at the tip of the fitting part in the cover And an elastic member is integrally vulcanized and bonded to the locking piece , and elastically contacts the axial surface of the step portion of the knuckle so that the cover is attached to the outer member. A wheel bearing device with a rotational speed detecting device, characterized in that it is prevented from moving in the axial direction. The wheel bearing device with a rotation speed detection device according to claim 1, wherein the cover is formed of a non-magnetic steel plate.

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