JP2009063529A - Wheel bearing device with rotating speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotating speed detector, preventing damage of an encoder even when foreign matter enters a detecting part to ensure desired detecting accuracy and improve the reliability. <P>SOLUTION: A sensor holder 10 includes a cylindrical fitting part 11a externally fitted to the end of an outer member 5; a collar part 11b radially extending inward from the above part and closely adhering to the end face of the outer member 5; a cover 11c formed of a bottom part 11c radially extending inward from the above part; a synthetic resin-made holding part 12 coupled to the cover 11 and enclosing a rotating speed sensor 13. An encoder cap 19 is mounted in closely adhering state on a magnetic encoder 15, and the encoder cap 19 is formed by press working of austenite stainless steel plate. The encoder cap 19 includes a disc part 19a abutted on the side of the magnetic encoder 15 and a locking part 19b bent from the outside diameter part of the disk part 19a in the axial direction to engage with the outer edge part of a slinger 14. <P>COPYRIGHT: (C)2009,JPO&amp;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.

  A wheel bearing with a rotation speed detecting device that rotatably supports a vehicle wheel with respect to a suspension device and controls an anti-lock brake system (ABS) to detect the rotation speed of the wheel. 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. 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.

  Generally, 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 adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, a wheel bearing with a rotational speed detection device that has a rotational speed sensor built into the bearing has recently been developed. A device has been proposed.

  A structure as shown in FIG. 4 is known as an example of such a wheel bearing device with a rotational speed detection device. This rotational speed detection device includes an encoder 51 fitted on the inner ring 50, a sensor holder 53 attached to the end of the outer member 52 so as to face the encoder 51, and a predetermined air to the encoder 51. And a rotation speed sensor 54 facing each other through a gap. The encoder 51 is joined to the side surface of the slinger 57 constituting the seal 56.

  The seal 56 includes a slinger 57 having a substantially L-shaped cross section, and an annular seal plate 58 mounted on the outer member 52 so as to face the slinger 57 and having a substantially L-shaped cross section. The slinger 57 includes a cylindrical portion 57a that is externally fitted to the inner ring 50, and a standing plate portion 57b that extends radially outward from the cylindrical portion 57a. On the other hand, the seal plate 58 includes a metal core 59 fitted into the end of the outer member 52, and a seal member 60 vulcanized and bonded to the metal core 59. The seal member 60 is made of an elastomer such as rubber, and includes a side lip 60a that is in sliding contact with the standing plate portion 57b of the slinger 57, and a grease lip 60b and an intermediate lip 60c that are in sliding contact with the cylindrical portion 57a.

  The sensor holder 53 includes a steel plate cover 55 fitted on the outer member 52 and a synthetic resin holding portion 61 coupled to a bottom portion 55 c of the cover 55. The cover 55 includes a cylindrical fitting portion 55a in which the outer member 52 is fitted, a flange portion 55b extending radially inward from the fitting portion 55a, and a bottom portion 55c extending in an axial direction from the flange portion 55b. It consists of. The rotation speed sensor 54 is embedded in the holding unit 61.

  The output of the rotational speed sensor 54 is taken out by the harness 62 and sent to an ABS controller (not shown). The harness 62 is connected via an extraction port 63 provided in the holding portion 61, and the extraction port 63 is formed at an inclination angle α set larger than the inclination angle β of the outer peripheral surface of the outer joint member 64. ing.

As a result, the harness 62 can be prevented from sagging and interfering with the outer joint member 64, so that the clip for stopping the sagging of the harness 62 can be minimized and the harness 62 itself need not be bent excessively. Therefore, the adverse effect on the internal wiring can be prevented and the reliability can be further improved. Therefore, the fixing work of the harness 62 can be simplified with a simple configuration, the assembling workability can be improved, and the cost can be reduced.
JP 2006-145418 A

  However, in this type of conventional wheel bearing device with a rotational speed detection device, the sensor holder 53 is press-fitted and fixed to the end of the outer member 52 via the cover 55, but interference with the outer joint member 64 is prevented. In order to avoid this, it is necessary to provide a radial clearance between the cover 55 and the outer joint member 64. In this case, foreign matter such as muddy water or pebbles may enter between the encoder 51 and the holding portion 61 from the annular space between the cover 55 and the outer joint member 64, and the surface of the encoder 51 may be damaged. As a result, not only the detection accuracy is lowered, but also ABS and speed detection may malfunction.

  The present invention has been made in view of such circumstances, and prevents the encoder from being damaged even if a foreign substance enters the detection unit, ensuring a desired detection accuracy and improving the reliability. The object is to provide a wheel bearing device with a detection device.

  In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface integrally on the inner periphery. A hub wheel integrally formed with a formed outer member and 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 a small-diameter step portion of the hub ring An inner member having at least one inner ring that is press-fitted and having a double-row inner rolling surface facing the outer-rolling surface of the double-row on the outer periphery, and both the inner member and the outer member. A double row rolling element housed between the rolling surfaces so as to be freely rollable, and a seal attached to an opening of an annular space formed between the outer member and the inner member; Rotational speed that is attached to the inner side end of the side member and detects the rotational speed of the wheel Built-in rotational speed detection device comprising a sensor holder in which a sensor is disposed and a magnetic encoder joined to a side surface of a slinger externally fitted to the inner ring and opposed to the rotational speed sensor via an axial clearance. In the wheel bearing device with a rotational speed detection device, the sensor holder includes a cylindrical fitting portion that is fitted on the inner side end of the outer member, and a radially inward direction from the fitting portion. A cover composed of a flange that extends and is in close contact with the end face of the outer member, and a bottom that extends further radially inward from the flange, and a composite that is coupled to the cover and in which the rotational speed sensor is embedded. And a non-magnetic encoder cap in close contact with the magnetic encoder.

  In this way, the sensor holder mounted on the inner side end of the outer member and provided with the rotational speed sensor for detecting the rotational speed of the wheel is joined to the side surface of the slinger externally fitted to the inner ring and rotated. In a wheel bearing device with a rotational speed detection device incorporating a rotational speed detection device comprising a magnetic encoder opposed to the speed sensor via an axial clearance, the sensor holder is located at the inner end of the outer member. A cylindrical fitting portion that is fitted externally, a flange portion that extends radially inward from the fitting portion and that is in close contact with the end surface of the outer member, and a bottom portion that extends further radially inward from the flange portion And a cover made of synthetic resin with a rotational speed sensor embedded therein, and a non-magnetic encoder cap attached to the magnetic encoder in close contact with the cover. Corrosion resistance It can improve the durability over a long period of time without substantially adversely affecting the sensing performance of the rotation speed sensor, and muddy water, pebbles, etc. in the detection section between the magnetic encoder and the rotation speed sensor It is possible to provide a wheel bearing device with a rotational speed detection device that prevents the magnetic encoder from being damaged even if the foreign matter enters, and ensures the desired detection accuracy and improves the reliability.

  Preferably, as in the invention described in claim 2, the encoder cap is formed by press working from a nonmagnetic austenitic stainless steel plate, and contacts the side surface of the magnetic encoder. A locking portion that is bent in an axial direction from an outer diameter portion of the portion and engages with an outer edge portion of the slinger, and this locking portion is configured by a plurality of tongue pieces with slits formed in a circumferentially uniform arrangement If this is done, moderate elasticity is given to the locking part, and the encoder cap can be easily attached to the outer edge part of the slinger with one touch, and the disk part is in close contact with the side surface of the magnetic encoder in the axial direction. The encoder cap can be fixed without any play.

  More preferably, as in the invention according to claim 3, if the encoder cap is bent in the axial direction from the inner diameter portion of the disc portion and engaged with the inner diameter portion of the magnetic encoder, the magnetic encoder On the other hand, the encoder cap can be fixed without play in a state in which the movement of the encoder cap in the radial direction is restricted.

  According to a fourth aspect of the present invention, the holding portion of the sensor holder is formed by injection molding from a nonmagnetic synthetic resin to which a fiber reinforcing material is added, and the rotational speed sensor is embedded. For example, the sensing performance of the rotation speed sensor is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time.

  In addition, as in the case of the invention of claim 5, if the cover is formed by press working from a steel plate having rust prevention ability, it has excellent corrosion resistance and improves strength and durability over a long period of time. Can do. Accurate detection accuracy can be ensured without adversely affecting the sensing performance of the rotational speed sensor.

  Preferably, when the cover is formed of an austenitic stainless steel plate as in the invention described in claim 6, it is excellent in corrosion resistance and does not adversely affect the sensing performance of the rotational speed sensor, and accurate detection accuracy. Can be secured.

  According to a seventh aspect of the present invention, in the magnetic encoder, the magnetic powder is mixed in the elastomer, the magnetic poles N and S are alternately magnetized in the circumferential direction, and the slinger is a ferromagnetic body. If the steel plate is formed by press working, the output signal of the magnetic encoder becomes stronger and stable detection accuracy can be ensured.

  A bearing device for a wheel with a rotational speed detection device according to the present invention has a vehicle body mounting flange integrally attached to a suspension device on the outer periphery, and an outer surface in which a double row outer rolling surface is integrally 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 at least press-fitted into the small-diameter step portion of the hub ring An inner member composed of one inner ring and formed on the outer periphery with a double row inner raceway facing the double row outer raceway, and between the inner member and both outer raceway surfaces of the outer member A plurality of rolling elements accommodated in a freely rotatable manner, and a seal attached to an opening of an annular space formed between the outer member and the inner member, and an inner member of the outer member A rotation speed sensor that is mounted at the end of the wheel and detects the rotation speed of the wheel. Is incorporated into a side surface of a slinger externally fitted to the inner ring, and a rotational speed detection device is built in which the rotational speed sensor is opposed to the rotational speed sensor via an axial clearance. In the wheel bearing device with a rotational speed detection device, the sensor holder includes a cylindrical fitting portion that is fitted on the inner side end of the outer member, and extends radially inward from the fitting portion. A cover made up of a flange closely contacting the end surface of the outer member, a bottom extending further radially inward from the flange, and a synthetic resin coupled to the cover and embedded with the rotational speed sensor A non-magnetic encoder cap in close contact with the magnetic encoder, so that it has excellent corrosion resistance and substantially adversely affects the sensing performance of the rotational speed sensor. In addition to improving durability over a long period of time, the magnetic encoder is prevented from being damaged even if foreign matter such as muddy water or pebbles enters the detection portion between the magnetic encoder and the rotation speed sensor, It is possible to provide a wheel bearing device with a rotation speed detection device that secures desired detection accuracy and improves reliability.

  An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for attaching a wheel to one end A hub ring formed on the outer periphery with an inner rolling surface facing one of the outer rolling surfaces of the double row, and a cylindrical small diameter step portion extending in the axial direction from the inner rolling surface, An inner member comprising an inner ring that is press-fitted into a small-diameter step portion of the hub wheel and has an inner rolling surface opposed to the other of the outer circumferential rolling surfaces of the double row, and the inner member and the outer member. A double row rolling element accommodated between both rolling surfaces of the side member, and a seal attached to an opening of an annular space formed between the outer member and the inner member. An outer joint member of a constant velocity universal joint is fitted into the hub wheel, and a shoulder portion of the outer joint member is The outer joint member is unitized so as to be able to transmit torque to the hub wheel and be detachable in a state of being in contact with the end surface of the inner ring, and is attached to the inner side end of the outer member, A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel, and a magnetic encoder joined to a side surface of a slinger externally fitted to the inner ring and opposed to the rotation speed sensor via an axial clearance. In the wheel bearing device with a rotational speed detection device incorporating the rotational speed detection device, the sensor holder includes a cylindrical fitting portion that is externally fitted to the inner end portion of the outer member, A cover comprising a flange that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, and a bottom that extends further radially inward from the flange, and is coupled to the cover, Rotational speed And a holding portion made of a synthetic resin in which a sensor is embedded, and an encoder cap is attached to the magnetic encoder in close contact with the magnetic encoder. The encoder cap is formed by pressing from an austenitic stainless steel plate, and the magnetic encoder And a locking portion that is bent in the axial direction from the outer diameter portion of the disk portion and engages with the outer edge portion of the slinger.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an 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. The longitudinal cross-sectional view which shows the encoder cap based on this invention, (b) is a front view. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as an outer side (left side in FIG. 1), and the side closer to the center is referred to as an inner side (right side in FIG.

  This wheel bearing device with a rotational speed detecting 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 inserted through 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Further, an outer side (one) inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery, and a torque transmission serration ( Or a spline) 1c is formed. An inner ring 2 having an inner side (the other side) inner raceway surface 2a formed on the outer periphery thereof is press-fitted and fixed to the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro.

  The hub wheel 1 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and a base portion 6b of a wheel mounting flange 6 serving as a seal land portion of a seal 8 described later. The surface hardness of the small-diameter step portion 1b is set to a range of 58 to 64 HRC by induction hardening. As a result, not only the wear resistance of the base portion 6b is improved, but also the fretting of the small-diameter stepped portion 1b serving as the fitting surface of the inner ring 2 is suppressed and the rotational bending load applied to the wheel mounting flange 6 is suppressed. And sufficient mechanical strength, and the durability of the hub wheel 1 is improved. The inner ring 2 and the rolling element 4 are made of a high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core by quenching.

  The outer member 5 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 5b for attaching to a knuckle (not shown) on the outer periphery. Double row outer rolling surfaces 5a, 5a facing the double row inner rolling surfaces 1a, 2a of the inner member 3 are integrally formed. These outer rolling surfaces 5a and 5a are subjected to a hardening process in a range of 58 to 64 HRC by induction hardening. Double row rolling elements 4, 4 are accommodated between outer rolling surfaces 5a, 5a of the outer member 5 and double row inner rolling surfaces 1a, 2a facing the outer rolling surfaces 5a, 5a, respectively. It is held so that it can roll freely. In addition, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The outer joint member 22 constituting the constant velocity universal joint integrally has a shaft portion 24 extending in the axial direction from the shoulder portion 23. A serration (or spline) 24a that engages the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 24, and a male screw 24b is formed at the end of the serration 24a. The outer joint member 22 is fitted into the hub wheel 1 through the serrations 1c and 24a until the shoulder 23 of the outer joint member 22 abuts with the end surface of the inner ring 2, and is fixed by the fixing nut 25 fastened to the male screw 24b. The hub wheel 1 and the outer joint member 22 are unitized so that torque can be transmitted and detachable.

  In the present embodiment, the sensor holder 10 is attached to the end of the outer member 5. The sensor holder 10 includes a cover 11 formed in a cup shape and a holding portion 12 coupled to the cover 11. As shown in FIG. 2 in an enlarged manner, the cover 11 is a cylindrical fitting portion 11a that is press-fitted into the outer periphery of the inner side end of the outer member 5, and extends radially inward from the fitting portion 11a. The flange portion 11b is in close contact with the end face of the outer member 5, and the bottom portion 11c extends further radially inward from the flange portion 11b, and is formed in an annular shape as a whole. And the inner diameter of the bottom part 11c opposes the shoulder part 23 of the outer joint member 22 through a slight radial clearance, and a labyrinth seal is formed.

  As described above, the fitting portion 11a is fitted on the inner side end of the outer member 5 with the flange portion 11b in close contact with the end surface of the outer member 5. Thus, the sensor holder 10 can be positioned and fixed easily and accurately, and the rotational speed of the wheel can be detected with high accuracy. The cover 11 is made of a non-magnetic steel plate having corrosion resistance, for example, a stainless steel plate such as an austenitic stainless steel plate (JIS standard SUS304, etc.), or a rust-proof cold rolled steel plate (JIS standard). SPCC system etc.) is formed by press working. As a result, it is possible to provide a wheel bearing device with a rotational speed detection device that suppresses rusting of the cover 11 and maintains reliability over a long period of time. In order not to adversely affect the sensing performance of the rotational speed sensor 13 to be described later, the cover 11 is preferably formed from a non-magnetic steel plate such as an austenitic stainless steel plate. In order to make it difficult to be affected, it is preferable that the cover 11 is made of a magnetic steel plate such as SPCC, which can be expected to have a magnetic shielding effect. preferable.

  On the other hand, a rotation speed sensor 13 is embedded in the holding portion 12 and is integrally coupled to one place radially outward of the bottom portion 11 c of the cover 11. The holding part 12 is formed by injection molding from a non-magnetic special ether-based synthetic resin material such as polyphenylene sulfide (PPS), and a fiber reinforcing material such as GF (glass fiber) is added thereto. As a result, the sensing performance of the rotational speed sensor 13 is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time.

  The rotational speed sensor 13 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element), etc. that changes its characteristics according to the flow direction of the magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detecting element. It is composed of an IC and faces a magnetic encoder 15 described later via a predetermined axial clearance (air gap). In addition, the holding part 12 can illustrate injection molding synthetic resins, such as PA (polyamide) 66, PA6-12, PPA (polyphthalamide), PBT (polybutylene terephthalate) other than the material mentioned above.

  A slinger 14 is press-fitted into the outer diameter of the inner ring 2 so as to face the holding portion 12 in the axial direction. The slinger 14 constitutes an inner-side seal 9 described later, and includes a cylindrical portion 14a that is press-fitted into the inner ring 2 and a standing plate portion 14b that extends radially outward from the cylindrical portion 14a. The slinger 14 is pressed from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430) or a rust-proof cold rolled steel plate (JIS standard SPCC). The cross section is formed in a substantially L shape by processing. A magnetic encoder 15 in which a magnetic powder such as ferrite is mixed with an elastomer such as rubber is integrally joined to the inner side surface of the standing plate portion 14b of the slinger 14 by vulcanization adhesion or the like. The magnetic encoder 15 is magnetized with magnetic poles N and S alternately in the circumferential direction, and constitutes a rotary encoder for detecting the rotational speed of the wheel. As described above, if the slinger 14 is formed of a ferromagnetic steel plate, the output signal of the magnetic encoder 15 becomes strong and stable detection accuracy can be ensured. In this example, the magnetic encoder 15 is made of an elastomer. However, the present invention is not limited to this. For example, the magnetic encoder 15 may be made of sintered metal obtained by hardening a ferromagnetic powder made of ferrite or the like with a metal binder.

  The inner side seal 9 is constituted by a so-called pack seal comprising the slinger 14 and an annular seal plate 16 mounted on the outer member 5 so as to face the slinger 14 and having a substantially L-shaped cross section. Has been. The seal plate 16 is a core 17 comprising a cylindrical portion 17a fitted into the inner end of the outer member 5 and a standing plate portion 17b extending radially inward from one end of the cylindrical portion 17a. The seal member 18 is vulcanized and bonded to the metal core 17. The core metal 17 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).

  On the other hand, the seal member 18 is made of an elastic member such as synthetic rubber, and includes a side lip 18a that is in sliding contact with the standing plate portion 14b of the slinger 14, and a grease lip 18b and an intermediate lip 18c that are in sliding contact with the cylindrical portion 14a.

  In the present embodiment, the seal 9 on the inner side and the sensor holder 10 are opposed to each other in the axial direction, and the magnetic encoder 15 is integrally joined to the slinger 14 that constitutes the seal 9, and the holding portion that constitutes the sensor holder 10. 12, a rotational speed sensor 13 is embedded, and the rotational speed sensor 13 and the magnetic encoder 15 are arranged opposite to each other in the axial direction.

  Here, the encoder cap 19 is attached to the magnetic encoder 15 so as to cover the surface thereof. This encoder cap 19 is formed by pressing a non-magnetic austenitic stainless steel plate (JIS standard SUS304 type or the like) and, as shown in FIG. 3, is a circle that contacts the side surface (detection unit) of the magnetic encoder 15. A plate portion 19a, a locking portion 19b that is bent in the axial direction from the outer diameter portion of the disk portion 19a and engages with the outer edge portion of the slinger 14 or the magnetic encoder 15, and a shaft from the inner diameter portion of the disk portion 19a. And a support portion 19 c that is bent in the direction and engages with the inner diameter portion of the magnetic encoder 15.

  The locking portion 19b is composed of a plurality of tongue pieces 21 with slits 20 formed at equal intervals in the circumferential direction. As a result, moderate elasticity is imparted to the locking portion 19b, and the encoder cap 19 can be easily attached to the outer edge portion of the slinger 14 with one touch, and the disc portion 19a is in close contact with the side surface of the magnetic encoder 15. Thus, the encoder cap 19 can be fixed without any axial play. Note that the locking portion 19b and the cylindrical portion 17a of the core metal 17 in the seal plate 16 face each other through a slight radial clearance to form a labyrinth seal.

  Further, since the support portion 19c is curved in the axial direction along the inner diameter portion of the magnetic encoder 15, the support portion 19c is fixed without looseness in a state where the movement of the encoder cap 19 in the radial direction is restricted with respect to the magnetic encoder 15. can do. The encoder cap 19 is not limited to a metal such as the illustrated nonmagnetic austenitic stainless steel plate, but may be formed by injection molding from a nonmagnetic special ether-based synthetic resin material such as polyphenylene sulfide. .

  As described above, the encoder cap 19 according to the present embodiment is formed of a nonmagnetic austenitic stainless steel plate or a synthetic resin and is elastically mounted so as to cover the magnetic encoder 15. In addition, the detection performance of the rotational speed sensor 13 is not adversely affected and the durability can be improved over a long period of time, and foreign matter such as muddy water and pebbles is present in the detection portion between the magnetic encoder 15 and the rotational speed sensor 13. It is possible to provide a wheel bearing device with a rotational speed detection device that prevents the magnetic encoder 15 from being damaged even if the intrusion occurs, ensures desired detection accuracy, and improves reliability.

  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 rotation speed detection device according to the present invention can be applied to a wheel bearing device with a rotation speed detection device in which a sensor holder is press-fitted and fixed to an end portion of an outer member through a cover.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. (A) is a longitudinal cross-sectional view which shows the encoder cap based on this invention. (B) is a front view same as the above. It is a principal part enlarged view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1 ... hub wheel 1a, 2a ... inner rolling surface 1b ...・ Small diameter step 1c, 24a ... Serration 2 ... Inner ring 3 ...・ Inner member 4 ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 5a ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Outer rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ···································· Hub bolt 6b・ ・ ・ ・ ・ ・ ・ ・ Outer side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side 10 ... Sensor holder 11 ... Cover 11a ... Fit Joint part 11b ..... collar part 11c ........... bottom part 12 ........... holding part 13 ... rotational speed sensor 14 ... slinger 14a, 17a ... cylindrical part 14b, 17b ... Standing plate 15 ... Magnetic encoder 16 ... Seal plate 17 ... ..... Core 18 ..... Seal member 18a .... Side lip 18b ... ..... Grease lip 18c ...・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder cap 19a ・ ・ ・ ・ ・ ・ ・ ・ Disk part 19b ・ ・ ・......... Locking part 19c ... ... Supporting part 20 ... Slit 21 ... ... tongue piece 22 ... outer joint member 23 ... shoulder 24 ... ······ Shaft 24b ····················································································・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 53 ・ ・ ・..... Sensor holder 54 ..... Sensor 55 ... cover 55a ... fitting part 55b ... collar 55c ......... Bottom 56 ... Seal 57 ... Slinger 57a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 57b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate part 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 59 ・ ・..... Core metal 60 ......... Sealing member 60a ... Side lip 60b ...・ ・ ・ ・ ・ ・ ・ ・ ・ Grease lip 60c ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 62 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Harness 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Out port 64 .............. outer joint member alpha, beta ............. tilt angle

Claims (7)

An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and an outer rolling surface of a double row 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 accommodated in a freely rolling manner between both rolling surfaces of the inner member and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
A sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel;
A bearing device for a wheel with a rotational speed detection device incorporating a rotational speed detection device built in a magnetic encoder joined to a side surface of a slinger externally fitted to the inner ring and opposed to the rotational speed sensor via an axial clearance. In
The sensor holder has a cylindrical fitting portion that is fitted on the inner end of the outer member, and extends radially inward from the fitting portion, and is in close contact with the end surface of the outer member. A cover comprising a flange and a bottom extending further inward in the radial direction from the flange; and a synthetic resin holder coupled to the cover and having the rotational speed sensor embedded therein; A bearing device for a wheel with a rotational speed detection device, wherein the encoder cap is mounted in a state of being in close contact with the encoder.   The encoder cap is formed by press working from a non-magnetic austenitic stainless steel plate, and is bent in the axial direction from a disk portion that contacts the side surface of the magnetic encoder and an outer diameter portion of the disk portion. 2. A rotation speed detecting device according to claim 1, further comprising a locking portion that engages with an outer edge portion of the slinger, wherein the locking portion is formed of a plurality of tongue pieces with slits formed at equal intervals in the circumferential direction. Wheel bearing device.   The wheel bearing device with a rotation speed detection device according to claim 2, wherein the encoder cap is bent in an axial direction from an inner diameter portion of the disc portion and engaged with an inner diameter portion of the magnetic encoder.   The rotational speed detection according to any one of claims 1 to 3, wherein the holding part of the sensor holder is formed by injection molding from a nonmagnetic synthetic resin to which a fiber reinforcing material is added, and the rotational speed sensor is embedded. Wheel bearing device with device.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 4, wherein the cover is formed by pressing from a steel plate having antirust performance.   The wheel bearing device with a rotation speed detection device according to claim 5, wherein the cover is formed of an austenitic stainless steel plate.   The magnetic encoder includes magnetic powder mixed in an elastomer, magnetic poles N and S are alternately magnetized in a circumferential direction, and the slinger is formed from a ferromagnetic steel plate by pressing. A wheel bearing device with a rotational speed detection device according to any one of claims 6 to 6.

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