JP2008261460A - Wheel bearing device with rotation speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotation speed detection device, which exhibits enhanced reliability by improving air-tightness of a fitting part of a seal and by enhancing sealabbility of the seal. <P>SOLUTION: The seal 11 is provided with an annular seal plate 21 and a slinger 22, the seal plate 21 is constituted by a core 24 insert-molded on a sensor holder 20 and a seal member 25, the slinger 22 is provided with a cylinder part 22a attached to an outside diameter of an inner ring 6 and a vertical plate part 22b, a pulser ring 23 is press-fitted and fixed to the cylinder part 22a, and a magnetic encoder 27 is arranged on an outside diameter part 26c thereof, and is confronted with a rotation speed sensor 28 while having a radial gap therebetween, and a side lip 25a of the seal member 25 is slidably abutted on the pulser ring 23, and radial lips 25b and 25c are slidably abutted on the cylinder part 22a of the slinger 22, and an adhesive 29 is at least applied to a cylinder part 24a of the core 24 in the seal plate 21, and the core 24 is fixed on an outer member 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotation speed detection device that includes a rotation speed sensor that detects the rotation speed of a wheel of an automobile or the like.

  A wheel bearing with a rotation speed detecting device in which a wheel of an automobile is rotatably supported with respect to a suspension device and a device for detecting the rotation speed of the wheel for controlling an anti-lock brake system (ABS) is incorporated in the 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. 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. 4 is known as an example of such a wheel bearing device with a rotational speed detection device. The wheel bearing device 50 with a rotational speed detection device includes an outer member 51, an inner member 53 inserted into the outer member 51 via double rows of balls 52, and the outer member 51 and the inner member. And a rotational speed detection device 54 mounted in an opening of an annular space formed between the member 53 and the member 53.

  The outer member 51 integrally has a vehicle body mounting flange 51b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row outer rolling surfaces 51a, 51a are integrated on the inner periphery. Is formed.

  On the other hand, the inner member 53 includes a hub wheel 55 and an inner ring 56 fixed to the hub wheel 55. The hub wheel 55 integrally has a wheel mounting flange 57 for mounting a wheel (not shown) at one end portion, and an inner rolling surface facing one of the double-row outer rolling surfaces 51a and 51a on the outer periphery. 55a and a cylindrical small-diameter step 55b extending in the axial direction from the inner rolling surface 55a are formed, and a serration 55c for torque transmission is formed on the inner periphery. The inner ring 56 is formed with an inner rolling surface 56a opposite to the other of the double row outer rolling surfaces 51a, 51a on the outer periphery, and is press-fitted into the small-diameter step portion 55b of the hub wheel 55 through a predetermined shimiro. .

  Double rows of balls 52, 52 are disposed between the double row outer raceway surfaces 51 a, 51 a of the outer member 51, and the inner raceway surface 55 a of the hub wheel 55 and the inner raceway surface 56 a of the inner ring 56, which are opposed thereto. It is accommodated and is held by the cages 58 and 58 so as to be freely rollable. In addition, seals 59 and 60 are attached to the opening portion of the annular space formed between the outer member 51 and the inner member 53, and leakage of the lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The rotational speed detection device 54 includes a sensor holder 62 in which a magnetic sensor 61 is embedded, and a seal 60. As shown in FIG. 5, the sensor holder 62 is molded from synthetic resin by injection molding, and the core metal 65 constituting the seal 60 is integrally formed by insert molding. The seal 60 is a so-called pack seal in which a first seal ring 63 and a second seal ring 64 are combined. The first seal ring 63 is attached to the outer member 51, and a cored bar 65 having a substantially L-shaped cross section, and is attached to the cored bar 65, and a side lip 66a and a pair of radial lips 66b, 66c. And a seal member 66 having

  The second seal ring 64 is attached to the inner ring 56 and has a slinger 67 having a substantially L-shaped cross section, and a pulsar ring 68 that is externally fitted to the slinger 67 and has a substantially U-shaped cross section. Consists of. The slinger 67 has a cylindrical portion 67a that is press-fitted into the outer diameter of the inner ring 56 and a standing plate portion 67b that extends radially outward from the cylindrical portion 67a. The pulsar ring 68 is press-fitted into the cylindrical portion 67a of the slinger 67. ing.

  The pulsar ring 68 includes a cylindrical inner diameter portion 68a that is press-fitted into the cylindrical portion 67a of the slinger 67, a standing plate portion 68b that extends radially outward from the inner diameter portion 68a, and an outer surface that extends from the standing plate portion 68b in the axial direction. It has a diameter portion 68c. A multipolar magnet rotor 69 is attached to the outer diameter portion 68c. The multi-pole magnet rotor 69 is magnetized from the radial direction so that rubber or resin containing magnetic powder is vulcanized and bonded, and the N and S poles are alternately arranged in the circumferential direction. Further, the side lip 66 a of the seal member 66 is in sliding contact with the upright plate portion 68 b of the pulsar ring 68, and the pair of radial lips 66 b and 66 c are in sliding contact with the cylindrical portion 67 a of the slinger 67.

  Here, a male connector 70 for connecting the magnetic sensor 61 and a harness (not shown) connected to the electronic circuit of the vehicle body protrudes radially outward at a predetermined circumferential position of the sensor holder 62. Are integrally formed (see FIG. 4).

As described above, the core metal 65 constituting the first seal ring 63 is press-fitted and fixed to the inner periphery of the end portion of the outer member 51, so that the inside of the bearing is interposed between the outer member 51 and the first seal ring 63. In addition, it is possible to prevent moisture from entering, and since the side lip 66a of the seal member 66 is slidably contacted with the upright plate portion 68b of the pulsar ring 68, the gap between the first seal ring 63 and the second seal ring 64 is reduced. Therefore, it is possible to prevent moisture from entering the bearing. In addition, since the metal portion is formed between the magnetic sensor 61 and the multipolar magnet rotor 69, it is possible to prevent the cored bar 65 from adversely affecting the detection accuracy of the magnetic sensor 61.
Japanese Patent Laid-Open No. 2005-133772

  However, in such a conventional wheel bearing device 50 with a rotational speed detection device, the first seal ring is used to prevent moisture from entering the bearing from between the outer member 51 and the first seal ring 63. The metal core 65 constituting 63 is press-fitted and fixed to the inner periphery of the end portion of the outer member 51. If the shape of the fitting surface of the outer member 51 and the metal core 65 is deformed or the dimensional accuracy is poor, the fitting portion There is a risk of moisture entering. Further, if the surface of the fitting surface is rough, the internal pressure increases when the temperature of the bearing rises during operation, and the grease may leak to the outside. In order to prevent such problems, the shape and dimensions of the fitting surface of the outer member 51 and the cored bar 65 are restricted as much as possible, but there is a limit in terms of cost effectiveness.

  The present invention has been made in view of such circumstances, and improves the airtightness of the fitting portion of the seal and improves the reliability by improving the sealability of the seal, and the wheel bearing with a rotational speed detection device is provided. The object is to provide a device.

  In order to achieve the 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 is integrally formed on the inner periphery. A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction on the outer periphery, and press-fitting into the small-diameter step portion of the hub ring An inner member formed of at least one inner ring formed on the outer periphery and formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, and both rolling of the inner member and the outer member. A double row rolling element housed between the running surfaces so as to be freely rollable, a seal attached to an opening of an annular space formed between the outer member and the inner member, and the outer member Attached to the end on the inner side and formed of synthetic resin by injection molding. Embedded in the sensor holder, the seal on the inner side of the seal is disposed opposite to each other, and includes an annular seal plate and a slinger formed in a substantially L-shaped cross section, the seal plate, A cylindrical part insert-molded in the sensor holder and fitted in the end of the outer member, and a cored bar having an inner diameter part extending radially outward from the cylindrical part, and an inner diameter part of the cored bar The slinger has a cylindrical portion attached to the outer diameter of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion, and the pulsar ring is attached to the cylindrical portion. Is inserted into the outer diameter of the pulsar ring, and a magnetic encoder whose characteristics in the circumferential direction change alternately and at equal intervals is provided. The magnetic encoder and the rotational speed sensor have a predetermined radial clearance. In the wheel bearing device with a rotational speed detection device opposed to each other, an adhesive is applied to at least a cylindrical portion of the core metal in the seal plate, and the core metal is fixed to the outer member via the adhesive. ing.

  In this way, a seal attached to the opening of the annular space formed between the outer member and the inner member, and an end on the inner side of the outer member, synthetic resin is formed by injection molding And a sensor holder in which the rotational speed sensor is embedded. The seal on the inner side of the seal is disposed opposite to each other, and includes an annular seal plate and a slinger formed in a substantially L-shaped cross section. A plate is insert-molded in the sensor holder, and is a cylindrical portion fitted inside the end portion of the outer member, and a cored bar having an inner diameter extending radially outward from the cylindrical part, and an inner diameter of the cored bar The slinger has a cylindrical part attached to the outer diameter of the inner ring and a standing plate part extending radially outward from the cylindrical part, and the pulsar ring is press-fitted into the cylindrical part. Fixed and circle on its outer diameter In a bearing device for a wheel with a rotational speed detecting device provided with a magnetic encoder in which characteristics relating to the direction are alternately and equally spaced, and the magnetic encoder and the rotational speed sensor are opposed to each other through a predetermined radial clearance, a seal plate Since an adhesive is applied to at least the cylindrical portion of the metal core and the metal core is fixed to the outer member via this adhesive, the seal plate is in a state of being alone with other parts during assembly or transportation. Even if it interferes, the cylindrical part that becomes the fitting part is not damaged, and the tightness of the fitting part with the outer member is improved without strictly regulating the dimensional accuracy of the core metal and the outer member. Thus, it is possible to provide a wheel bearing device with a rotational speed detection device with improved reliability.

  Preferably, as in the invention described in claim 2, if the adhesive is applied to the entire surface of the core metal, the core metal can be applied by immersing the adhesive in the adhesive. As a result, the cost can be reduced.

  If the adhesive is applied to the fitting part of the pulsar ring as in the invention described in claim 3, the pulsar ring can be fitted even if it interferes with other parts during assembly or transportation in a single state. The sealing portion can be secured by improving the airtightness of the fitting portion with the slinger without damaging the portion and without strictly regulating the dimensional accuracy of the core metal and the slinger.

  According to a fourth aspect of the present invention, the pulsar ring includes a cylindrical inner diameter portion that is press-fitted into the cylindrical portion of the slinger, a vertical plate portion that extends radially outward from the inner diameter portion, and the vertical plate. It has an outer diameter portion extending in the axial direction from the plate portion, and a cross section is formed in a substantially U shape by pressing from a steel plate, and the sealing member has a side lip and a radial lip integrally. If the lip is slidably contacted with the vertical plate portion of the pulsar ring and the radial lip is slidably contacted with the cylindrical portion of the slinger, the pulsar ring is isolated from the rolling element and each rolling surface, and the rotation of the rolling element causes It is possible to prevent the generated metal wear powder or the like from adhering to the magnetic encoder, and avoid a decrease in detection accuracy.

  According to a fifth aspect of the present invention, the pulsar ring is formed from a ferromagnetic steel plate, and the magnetic encoder includes magnetic material powder mixed in an elastomer, and magnetic poles N and S are alternately arranged in the circumferential direction. If the rotary encoder is configured by magnetizing the magnetic field, the output signal becomes strong and stable detection accuracy can be ensured.

  The wheel bearing device with a rotational speed detection device according to the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and an outer side 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 one press-fitted into the small-diameter step portion of the hub ring An inner member formed of two inner rings and having an outer periphery formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, and between both rolling surfaces of the inner member and the outer member. A double row rolling element housed in a freely rollable manner, a seal mounted in an opening of an annular space formed between the outer member and the inner member, and an inner end of the outer member Is attached to the part and formed by injection molding of synthetic resin to wrap the rotational speed sensor. A seal holder on the inner side of the seal, and an annular seal plate and a slinger formed in a substantially L-shaped cross section, wherein the seal plate includes the sensor holder. And a cored bar having a cylindrical part fitted in the end part of the outer member and an inner diameter part extending radially outward from the cylindrical part, and an inner diameter part of the cored bar are integrally joined. The slinger has a cylindrical portion attached to the outer diameter of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion, and the pulsar ring is press-fitted and fixed to the cylindrical portion. A magnetic encoder in which characteristics in the circumferential direction change alternately and at equal intervals is provided at the outer diameter portion of the pulsar ring, and the magnetic encoder and the rotational speed sensor are provided with a predetermined radial clearance. In the wheel bearing device with a rotational speed detection device opposed to each other, an adhesive is applied to at least a cylindrical portion of the core metal in the seal plate, and the core metal is fixed to the outer member via the adhesive. Therefore, even if it interferes with other parts during assembly or transportation in the state of the seal plate alone, the cylindrical part that becomes the fitting part will not be damaged, and the dimensional accuracy of the core metal and the outer member will be strict. Without restriction, it is possible to provide a wheel bearing device with a rotational speed detection device that improves the airtightness of the fitting portion with the outer member and improves the reliability.

  In addition, since the fitting surface of the outer member is formed by turning or the like, the surface roughness is relatively rough, but by applying an adhesive to the fitting surface, the surface roughness is rather rough, As the adhesive remains, the adhesive area increases and the adhesive strength increases, so that the cost can be reduced, and the airtightness of the fitting part between the outer member and the core metal is further improved to improve the sealing performance. Can be secured.

  An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel integrally formed and having an inner rolling surface facing one of the outer rolling surfaces of the double row 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 comprising an inner ring that is press-fitted into a small-diameter step portion and has an outer race formed with an inner race surface facing the other of the outer row raceways in the double row, 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, a seal attached to an opening of an annular space formed between the outer member and the inner member, and the outer member Is attached to the inner side end of the plastic and is formed by injection molding of a synthetic resin. A seal holder on the inner side of the seal, and an annular seal plate and a slinger formed in a substantially L-shaped cross section, wherein the seal plate includes the sensor holder. And a metal core having a cylindrical portion that is insert-molded into the end portion of the outer member and an inner diameter portion that extends radially inward from the cylindrical portion, and is integrally joined to the inner diameter portion of the metal core. The slinger has a cylindrical portion attached to the outer diameter of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion. A pulsar ring is press-fitted and fixed to the cylindrical portion, and a magnetic encoder in which characteristics in the circumferential direction change alternately and at equal intervals is provided on an outer diameter portion of the pulsar ring. Are opposed to each other through a predetermined radial clearance, and the side lip of the seal member is slidably contacted with the pulsar ring, and the radial lip is slidably contacted with the cylindrical portion of the slinger In the apparatus, an adhesive is applied to at least a cylindrical portion of the core metal in the seal plate, and the core metal is fixed to the outer member via the adhesive.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 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 of FIG. 1, and FIG. The perspective view which shows a sealing plate single-piece | unit, (b) is a perspective view which shows a pulsar ring single-piece | unit same as the above. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device with a rotational speed detection device is called a third generation structure for driving wheels, and is constituted by unitizing the hub wheel 1, the double row rolling bearing 2 and the constant velocity universal joint 8. The double-row rolling bearing 2 includes an outer member 3, an inner member 4, and double-row rolling elements (balls) 5 and 5.

  The outer member 3 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and a vehicle body mounting flange 3b to be attached to a knuckle (not shown) constituting a suspension device is integrally formed on the outer periphery. And double row outer rolling surfaces 3a, 3a are integrally formed on the inner periphery. And these double row outer side rolling surfaces 3a and 3a are hardened in the surface hardness of the range of 58-64HRC by induction hardening.

  On the other hand, the inner member 4 includes a hub wheel 1 and an inner ring 6 fixed to the hub wheel 1. The hub wheel 1 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at an end portion on the outer side, and on the outer side (on the outer side facing the double-row outer raceway surfaces 3a and 3a on the outer periphery). On the other hand, an 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, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. . Hub bolts 7 a are implanted at equal circumferential positions on the wheel mounting flange 7.

  The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes a base 7b of a wheel mounting flange 7 on which an outer-side seal 10 to be described later comes into sliding contact, including the inner rolling surface 1a. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the small diameter step 1b. In addition, the crimping part 1d mentioned later is made into the surface hardness after forging by non-hardening.

  The inner ring 6 is formed with an inner side (other side) inner rolling surface 6a facing the double row outer rolling surfaces 3a and 3a on the outer periphery, and a small diameter step portion 1b of the hub wheel 1 via a predetermined scissors. It is press-fitted. The inner ring 6 is fixed to the hub wheel 1 in the axial direction by a caulking portion 1d formed by plastically deforming the end of the small-diameter stepped portion 1b radially outward. The inner ring 6 and the rolling element 5 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching.

  Between the double-row outer raceway surfaces 3a and 3a of the outer member 3, and the inner raceway surface 1a of the hub wheel 1 and the inner raceway surface 6a of the inner ring 6 facing these, the double-row rolling elements 5 and 5 are provided. Is held by the cages 9 and 9 so as to be freely rollable. The end surface on the small diameter side (front side) of the inner ring 6 abuts with the shoulder portion of the hub wheel 1 in a butted state to constitute a so-called back-to-back type double-row angular ball bearing. Further, seals 10 and 11 are attached to the opening portion of the annular space formed between the outer member 3 and the inner member 4, and leakage of the lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The constant velocity universal joint 8 includes an outer joint member 12, a joint inner ring 13, a cage 14 and a torque transmission ball 15. The outer joint member 12 integrally includes a cup-shaped mouth portion 16, a shoulder portion 17 that forms the bottom portion of the mouth portion 16, and a shaft portion 18 that extends from the shoulder portion 17 in the axial direction. A serration 18a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 18, and a male screw 18b is formed at the end of the serration 18a. The outer joint member 12 is fitted into the hub wheel 1 through the serrations 1c and 18a until the end surface of the crimping portion 1d and the shoulder portion 17 abut each other, and the hub wheel is fixed by the fixing nut 19 fastened to the male screw 18b. 1 and the outer joint member 12 are unitized so that torque can be transmitted and detachable.

  In the present embodiment, the sensor holder 20 is attached to the inner end of the outer member 3. The inner seal 11 is attached to an opening of an annular space formed between the sensor holder 20 and the inner ring 6. As shown in an enlarged view in FIG. 2, the seal 11 includes an annular seal plate 21 and a slinger 22 each having a substantially L-shaped cross section, and is disposed to face each other. The seal plate 21 includes a cored bar 24 that is insert-molded in the sensor holder 20, and a seal member 25 that is integrally bonded to the cored bar 24 by vulcanization adhesion or the like. A pulsar ring 23 is fitted on the slinger 22.

  The core metal 24 is made of austenitic stainless steel (JIS standard SUS304, etc.), ferritic stainless steel (JIS standard SUS430, etc.), or rust-proof cold rolled steel (JIS standard SPCC). A cylindrical portion 24a formed by press working and insert-molded in the sensor holder 20, and an inner diameter portion 24b extending radially inward from the cylindrical portion 24a. The seal member 25 is made of an elastic member such as synthetic rubber, and is integrally joined to the inner diameter portion 24b of the core metal 24 by vulcanization adhesion or the like, and integrally includes a side lip 25a and a pair of radial lips 25b and 25c. Yes. The cored bar 24 is preferably formed of a non-magnetic austenitic stainless steel plate so as not to adversely affect the sensing performance of the rotational speed sensor 28.

  The slinger 22 is an austenitic stainless steel plate (JIS standard SUS304 type, etc.), a ferritic stainless steel plate (JIS standard SUS430 type, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC type). Etc.) is formed by press working, and has a cylindrical portion 22a that is press-fitted into the outer diameter of the inner ring 6, and a standing plate portion 22b that extends radially outward from the cylindrical portion 22a.

  The pulsar ring 23 includes a metal core 26 press-fitted into the slinger 22 and a magnetic encoder 27 integrally joined to the outer diameter portion 26c of the metal core 26 by vulcanization adhesion. The core metal 26 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), and is pressed. The cross-section is formed into a substantially U-shape by processing, and a cylindrical inner diameter portion 26a that is press-fitted into the cylindrical portion 22a of the slinger 22, a standing plate portion 26b that extends radially outward from the inner diameter portion 26a, and the standing plate portion 26b. An outer diameter portion 26c extending in the axial direction from the plate portion 26b is provided. The side lip 25 a of the seal member 25 is slidably contacted with the standing plate portion 26 b of the core metal 26, and the pair of radial lips 25 b and 25 c are slidably contacted with the cylindrical portion 22 a of the slinger 22.

  The magnetic encoder 27 is made of a rubber magnet in which a magnetic powder such as ferrite is mixed in an elastomer such as rubber, and magnetic poles N and S are alternately magnetized in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel. is doing. Thereby, combined with the ferromagnetic cored bar 26, the output signal becomes strong, and stable detection accuracy can be ensured.

  By constructing such a seal 11, it is possible to prevent the pulsar ring 23 from being contaminated by dust and the like, and the rolling elements 5 and the respective lip 25 a and the radial lips 25 b and 25 c of the seal plate 21 slidably contacting the pulsar ring 23 Since it is isolated from the rolling surface, it is possible to prevent metal wear powder or the like generated by the rotation of the rolling element 5 from adhering to the magnetic encoder 27, and to prevent a decrease in detection accuracy.

  The sensor holder 20 is made of a non-magnetic resin material such as polyphenylene sulfide (PPS), and a rotational speed sensor 28 facing the magnetic encoder 27 via a predetermined radial gap (air gap) is embedded. . This rotational speed sensor 28 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 this magnetic detecting element. IC. Thereby, it is possible to detect the rotational speed with high reliability at low cost. The sensor holder 20 can be exemplified by synthetic resins that can be injection molded, such as PA (polyamide) 66, polybutylene terephthalate (PBT), in addition to the materials described above.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 27 and the rotational speed sensor 28 including a magnetic detection element such as a Hall element is illustrated. The rotational speed detection device is not limited to this, and may be, for example, a passive type composed of a magnetic encoder, a magnet, and an annular coil wound around.

  Here, as shown in FIG. 3A, an adhesive 29 is applied to the cylindrical portion 24 a of the cored bar 24 in the seal plate 21. Thereby, in the state of the seal plate 21 alone, the cylindrical portion 24a serving as the fitting portion is not damaged even if it interferes with other parts during assembly or transportation, and the cored bar 24 or the outer member 3 is not damaged. Without strictly restricting the dimensional accuracy, it is possible to provide a wheel bearing device with a rotational speed detection device that improves the airtightness of the fitting portion with the outer member 3 and improves the reliability. Since the fitting surface of the outer member 3 is formed by turning or the like, the surface roughness is relatively rough. However, by applying the adhesive 29 to the fitting surface, the surface roughness is rather small. The rougher ones with the remaining processing lines increase the bonding area and increase the adhesive force, thereby reducing the cost and further improving the airtightness of the fitting portion between the outer member 3 and the cored bar 24. It is possible to improve the sealing performance.

  Examples of the adhesive 29 include an epoxy resin system, a phenol resin system, a polyurethane system, and a polyethylene system. Here, the adhesive 29 is applied to the cylindrical portion 24a of the metal core 24 fitted to the outer member 3. However, the present invention is not limited thereto, and the adhesive 29 may be applied to the entire surface of the metal core 24. good. Thereby, the metal core 24 can be dipped and applied in the adhesive 29, so that mass productivity can be increased and cost can be reduced.

  Furthermore, in this embodiment, as shown in FIG. 5B, an adhesive 29 is applied to the inner diameter portion 26a of the core metal 26 in the pulsar ring 23 fitted to the slinger 22. Thereby, in the state of the pulsar ring 23 alone, even if it interferes with other parts during assembly or transportation, the inner diameter portion 26a serving as the fitting portion is not damaged, and the dimensional accuracy of the core metal 26 and the slinger 22 Without tightly restricting, the hermeticity of the fitting portion with the slinger 22 can be improved and the sealing performance of the seal 11 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 rotation speed detection device according to the present invention can be applied to a wheel bearing device in which any type of rotation speed detection device having an inner ring rotation structure is incorporated.

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 of FIG. (A) is a perspective view which shows the seal plate simple substance concerning this invention. (B) is a perspective view showing the pulsar ring alone. 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 of FIG.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Small diameter step 1c, 18a ... Serration 1d ... Caulking part 2 ...・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside member 3a ・ ・ ・ ・ ・ ・ ・ ・ Outside Rolling surface 3b .... Body mounting flange 4 ... Inner member 5 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 7a ............ Hub bolt 7b ......... Base 8 ...・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Seal 11 ... Seal 12 on the inner side ... Outer joint member 13 ...・ ・ ・ ・ ・ ・ Fitting inner ring 14 ・ ・ ・ ・ ・ ・ Cage 15 ・ ・ ・ ・ ・ ・ Torque transmission ball 16・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 18 ・ ・ ・ ・ ・ ・ ・ ・ Shaft part 18b ・・ ・ ・ ・ ・ ・ ・ ・ Male thread 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・··· Slinger 22a ····································································・ ・ ・ ・ Pulsar ring 24, 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 25a ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Side lips 25b, 25c ・ ・ ・ ・ ・ Radial lip 26a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner diameter part 26c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Outer diameter 27 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 29 ・ ・ ・... Adhesive 50 ... Wheel bearing device 51 with rotational speed detection device ... ... External member 51a ...・ ・ ・ ・ Outer rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 53・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed detector 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Hub wheel 55a, 56a ... Inside rolling surface 55b ... Small diameter step 55c ...・ ・ Serration 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 57 ・ ・ ・ ・ ・ ・ Wheel mounting flange 58 ・ ・ ・ ・ ・ ・... Cage 59 ... Outer side seal 60 ... Inner side seal 61 ... .... Magnetic sensor 62 ... ·········· Sensor holder 63 ··························· Seal ring 65 ... cored bar 66 ... seal member 66a ... .... Side lips 66b, 66c ... Radial lip 67 ... Slinger 67a ... ... Cylinder part 67b, 68b ... Standing plate part 68 ... Pulsar ring 68a ... ... Inner diameter part 68c ... Outer diameter part 69 ... Multipolar magnet rotor 70 ... ·········connector

Claims (5)

An outer member integrally having a vehicle body mounting flange for mounting to a 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 housed so as to be freely rollable 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, formed of synthetic resin by injection molding, and embedded with a rotational speed sensor;
Among the seals, the inner side seals are arranged to face each other, and include an annular seal plate and a slinger formed in a substantially L-shaped cross section,
The seal plate is insert-molded in the sensor holder, and has a cylindrical portion fitted into an end portion of the outer member, and a core bar having an inner diameter portion extending radially outward from the cylindrical portion, and the core bar And a sealing member integrally joined to the inner diameter part of
The slinger has a cylindrical portion attached to the outer diameter of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion, and a pulsar ring is press-fitted and fixed to the cylindrical portion, and the outer diameter portion of the pulsar ring Is provided with a magnetic encoder whose characteristics in the circumferential direction are alternately changed at equal intervals, and this magnetic encoder and the rotational speed sensor are opposed to each other through a predetermined radial clearance. In
A wheel bearing device with a rotational speed detection device, wherein an adhesive is applied to at least a cylindrical portion of the core metal in the seal plate, and the core metal is fixed to the outer member via the adhesive. .   The wheel bearing device with a rotation speed detection device according to claim 1, wherein the adhesive is applied to the entire surface of the metal core.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein an adhesive is applied to a fitting portion of the pulsar ring.   The pulsar ring has a cylindrical inner diameter portion that is press-fitted into the cylindrical portion of the slinger, a standing plate portion that extends radially outward from the inner diameter portion, and an outer diameter portion that extends in the axial direction from the standing plate portion. The cross section is formed into a substantially U shape by pressing from a steel plate, and the seal member has a side lip and a radial lip integrally, and the side lip is slidably contacted with the vertical plate portion of the pulsar ring. The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 3, wherein the radial lip is slidably contacted with a cylindrical portion of the slinger.   The pulsar ring is formed of a ferromagnetic steel plate, and the magnetic encoder constitutes a rotary encoder in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction. Item 5. A wheel bearing device with a rotational speed detection device according to any one of Items 1 to 4.

Images