JP2009002385A - Wheel bearing device with rotational speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotational speed detector, preventing separation of a sensor holder from a core and also achieving improved detection accuracy and reliability. <P>SOLUTION: The core 24 has an outside diameter cylindrical part 24a press-fitted into the end of an outward member 3 and formed with a circular hole 26, a rising plate part 24b extending radially inward from the side outward of the bearing of the outside diameter cylindrical part 24a, an inside diameter cylindrical part 24c extending from the rising plate part 24b to the side inward of the bearing, and an inside diameter part 24d extending radially inward from the inside diameter cylindrical part 24c. The sensor holder 20 is insert-molded in and integrally coupled to a portion extending over the rising plate part 24b and inside diameter cylindrical part 24c from the outside diameter cylindrical part 24a, a seal member 25 is joined to the inside diameter part 24d, and the inside diameter part 24d is arranged to be evacuated from the detection part of a rotational speed sensor 29 to the side outward of the bearing. Therefore, an air gap between the detection part and a magnetic encoder 28 can be reduced, and high magnetic flux density can be provided. <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 an end of the outer member 51. And a rotational speed detecting device 54 mounted on the head.

  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 portion 55b extending in the axial direction from the inner rolling surface 55a are formed. 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.

  As shown in FIG. 5, the rotational speed detection device 54 includes a sensor holder 62 in which a magnetic sensor 61 is embedded, and a seal 60. The sensor holder 62 is insert-molded integrally with a metal core 65 constituting the seal 60 by injection molding from synthetic resin.

  The seal 60 is configured by combining a first seal ring 63 and a second seal ring 64. The first seal ring 63 includes a cored bar 65 formed by a single rigid ring, and a seal member 66 attached to the cored bar 65. The cored bar 65 includes a fitting cylindrical portion 65a fitted in the end portion of the outer member 51, an outer flange portion 65b extending radially inward from the cylindrical portion 65a, and an axially outward direction from the flange portion 65b. It has a moisture intrusion preventing cylindrical portion 65c extending to the left and an inner flange portion 65d extending radially inward from the cylindrical portion 65c. And the sealing member 66 is adhere | attached on the inner peripheral part of this inner side flange part 65d.

  The second seal ring 64 includes a slinger 67 that is attached to the inner ring 56 and has a substantially L-shaped cross section, and a pulsar ring 68 that is externally fitted to the slinger 67. The slinger 67 has a cylindrical portion 67a that is press-fitted into the small-diameter portion 56b of the inner ring 56, and an outward flange portion 67b that extends radially outward from the cylindrical portion 67a. An elastic seal 69 having an axial lip 69a that is in sliding contact with the end face is provided.

  The pulsar ring 68 includes an annular support member 70 and a magnetized body 71 bonded thereto. The support member 70 is a small-diameter cylindrical portion 70a that is press-fitted into the cylindrical portion 67a of the slinger 67, a connecting portion 70b that extends radially outward from the small-diameter cylindrical portion 70a, and an axially inward extending from the connecting portion 70b. The inner ring 56 includes a large-diameter cylindrical portion 70c formed with a larger diameter than the large-diameter portion 56c. The magnetized body 71 is bonded to the large diameter cylindrical portion 70c. This magnetized body 71 is magnetized from the radial direction so that rubber or resin containing magnetic powder is vulcanized and bonded and the N poles and S poles are alternately arranged in the circumferential direction. The magnetic sensor 61 is disposed so as not to contact the portion 65c.

  The seal member 66 includes a slinger side lip 66a slidably in contact with the outward flange portion 67b of the slinger 67, a pair of radial lips 66b and 66c slidably in contact with the small diameter cylindrical portion 70a of the support member 70, and the support member 70. And a pulsar side lip 66d that is in sliding contact with the connecting portion 70b.

  The sensor holder 62 is opposed to the end surface of the outer member 51 through a slight axial clearance, and an annular recess 72 is formed so as to expose a part of the outer diameter of the fitting cylindrical portion 65a of the cored bar 65. Has been. An O-ring 73 is elastically mounted in the recess 72, and a disc-like cover 74 having a hole diameter smaller than the outer diameter of the slinger 67 is mounted on the outer end surface of the sensor holder 62.

In the rotational speed detection device 54, after the first seal ring 63 and the pulsar ring 68 are combined, the support member 70 of the pulsar ring 68 is press-fitted into the slinger 67, so that all components including the O-ring 73 are assembled in advance. When the whole is pressed in the axial direction, the fitting cylindrical portion 65a of the core metal 65 is fitted into the end of the outer member 51, and the cylindrical portion 67a of the slinger 67 is a small diameter portion of the inner ring 56. It is press-fitted into 56b. With such a configuration, separation of the cored bar 65 and the sensor holder 62 can be prevented, and intrusion of moisture from the boundary between the cored bar 65 and the sensor holder 62 can be prevented.
JP 2006-183701 A

  In the conventional wheel bearing device 50 with a rotational speed detection device, the sensor holder 62 is insert-molded in the core metal 65, so that the separation of the sensor holder 62 and the core metal 65 can be prevented, and the core metal 65 and the sensor holder can be prevented. Intrusion of moisture from the boundary with 62 can be prevented. However, although the magnetic sensor 61 is disposed so as not to contact the moisture intrusion preventing cylindrical portion 65c of the core metal 65, the magnetic sensor 61 and the magnetized body 71 are opposed to each other through the steel core metal core 65. Therefore, even if the core metal 65 is made of a non-magnetic material that does not affect the detection accuracy, the air gap becomes at least as large as the thickness of the core metal 65, and the detection accuracy due to the high magnetic flux density There was a limit to improving reliability.

  The present invention has been made in view of such circumstances, and provides a wheel bearing device with a rotational speed detection device that prevents separation of the sensor holder and the cored bar and improves detection accuracy and reliability. The purpose is to do.

  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 inner end and formed from synthetic resin by injection molding, Embedded in the sensor holder and a magnetic encoder whose characteristics in the circumferential direction change alternately and at equal intervals. The inner seal of the seal is formed by insert-molding the sensor holder and the exposed portion. Is a core metal that is press-fitted into the end of the outer member, an annular seal plate that is integrally joined to the core metal, and that has a side lip and a radial lip, and a seal member that faces the seal plate. A slinger that is press-fitted into the outer diameter of the inner ring, and a pulsar ring that is externally fitted and fixed to the slinger and has the magnetic encoder provided on the outer diameter portion thereof, and the side lip is in sliding contact with the pulsar ring and the slinger. The radial lip is brought into sliding contact with the pulsar ring, and the magnetic encoder has a predetermined radial clearance with the rotational speed sensor. In the wheel bearing device with a rotational speed detection device opposed to each other, the core metal is press-fitted into the end portion of the outer member, and the outer diameter cylindrical portion from the bearing outer side A standing plate portion extending radially inward, an inner diameter cylindrical portion extending from the standing plate portion toward the bearing inward side, and an inner diameter portion extending radially inward from the inner diameter cylindrical portion. It is insert-molded into a part extending from the outer diameter cylindrical part to the upright plate part and the inner diameter cylindrical part, and is joined together, and the seal member is joined to the inner diameter part, and the inner diameter part is detected from the detection part of the rotational speed sensor. It is retracted and arranged outside the bearing.

  In this way, the seal attached to the opening of the annular space formed between the outer member and the inner member and the inner end of the outer member are formed by injection molding from a synthetic resin. The sensor holder in which the rotational speed sensor is embedded and the magnetic encoder in which the characteristic in the circumferential direction changes alternately and at equal intervals, the seal on the inner side of the seal is insert-molded, A cored bar whose exposed portion is press-fitted into the end of the outer member, an annular seal plate integrally formed with the cored bar, and a seal member integrally including a side lip and a radial lip; It consists of a slinger that is press-fitted into the outer diameter of the inner ring and a pulsar ring that is fitted and fixed to this slinger and has a magnetic encoder on its outer diameter. In a bearing device for a wheel with a rotational speed detection device that is slidably contacted with a saling and a slinger, a radial lip is slidably contacted with a pulsar ring, and a magnetic encoder is opposed to the rotational speed sensor via a predetermined radial clearance, Is an outer diameter cylindrical portion that is press-fitted into an end portion of the outer member, a standing plate portion that extends radially inward from the bearing outer side of the outer diameter cylindrical portion, and a bearing plate inner side from the standing plate portion. It has an inner cylindrical portion that extends and an inner diameter portion that extends radially inward from the inner cylindrical portion, and the sensor holder is insert-molded into a part extending from the outer cylindrical portion to the vertical plate portion and the inner cylindrical portion, and is integrally coupled At the same time, a seal member is joined to the inner diameter portion, and this inner diameter portion is disposed so as to be retracted from the detection portion of the rotational speed sensor to the outside of the bearing. Rotation speed sensor and magnetic energy Rather than a coder facing, since the magnetic detector and the magnetic encoder of the rotation speed sensor is facing directly can be set as small as possible the air gap. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that can obtain a high magnetic flux density and improve detection accuracy and reliability.

  Preferably, as in the invention described in claim 2, the magnetic encoder is made of a rubber magnet in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction, and the rotation The speed sensor includes a magnetic detection element that changes characteristics according to the flow direction of magnetic flux, and an IC that incorporates a waveform shaping circuit that adjusts the output waveform of the magnetic detection element via a lead wire. If the hole for passing the lead wire is formed in the outer diameter cylindrical part, it is not necessary to wire the lead wire avoiding the core metal, and the magnetic detection element and the IC can be connected at the shortest distance, and the rotational speed The reliability of the sensor can be improved.

  Further, if a plurality of holes are formed in the outer diameter cylindrical portion of the core metal as in the invention according to claim 3, the work of wiring the lead wire is made efficient and the IC and the harness are connected. After that, the resin of the sensor holder enters and is closed in these holes, so it is exposed to harsh environments where muddy water and salt water are splashed, and even if used under harsh conditions such as repeated high and low temperatures Adhesiveness between the resin sensor holder and the metal core can be ensured, and the insert-molded sensor holder can be prevented from being peeled off from the metal core for a long period of time.

  If the sensor holder is made of a nonmagnetic synthetic resin as in the invention described in claim 4, the detection accuracy and reliability of the rotational speed sensor can be further improved.

  Further, as in the invention described in claim 5, an annular groove is formed in the inner periphery of the end portion of the outer member, and is bent radially outward at an end portion of the outer diameter cylindrical portion of the cored bar. If the locking portion is formed and this locking portion is engaged with the annular groove, the metal core moves relative to the outer member even if vibration or impact is applied during operation of the vehicle. This can be surely prevented, and the detection unit can be prevented from being displaced, and stable detection accuracy can be maintained over a long period of time.

  According to a sixth aspect of the present invention, a small-diameter portion and a large-diameter portion are formed on the outer diameter of the inner ring, the cylindrical portion of the slinger is press-fitted into the small-diameter portion, and the pulsar ring is made ferromagnetic. A cylindrical inner diameter portion formed by pressing from a steel plate of the body and press-fitted into the cylindrical portion of the slinger, a standing plate portion extending radially outward from the inner diameter portion, and a bearing inward from the standing plate portion And a support member having a cylindrical outer diameter portion that is slightly larger in diameter than the large diameter portion of the inner ring, and the magnetic encoder is integrally joined to the outer diameter portion of the support member. Therefore, the sealing performance can be improved and the pulsar ring can be prevented from being contaminated by rainwater, dust, etc., and the output signal is strengthened in combination with the characteristics of the support member made of a ferromagnetic material, resulting in stable detection accuracy. Can be secured.

  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 The rotation speed sensor is encased and formed by injection molding from synthetic resin. And a magnetic encoder whose characteristics in the circumferential direction change alternately and at equal intervals. The seal on the inner side of the seal is formed by insert molding of the sensor holder, and the exposed part is the outer part. A metal core press-fitted into the end of the one-way member, an annular seal plate integrally joined to the metal core and having a side lip and a radial lip, and the inner ring facing the seal plate And a pulsar ring that is fitted and fixed to the slinger and is provided with the magnetic encoder on the outer diameter portion, and the side lip is slidably contacted with the pulsar ring and the slinger, and the radial A lip is slidably contacted with the pulsar ring, and the magnetic encoder passes through a predetermined radial clearance to the rotational speed sensor. In the wheel bearing device with a rotational speed detection device opposed to each other, the cored bar is press-fitted into an end portion of the outer member, and a radial direction from the bearing outer side of the outer diameter cylindrical portion A standing plate portion extending inward, an inner diameter cylindrical portion extending from the standing plate portion toward the bearing inward side, and an inner diameter portion extending radially inward from the inner diameter cylindrical portion, wherein the sensor holder has the outer diameter It is insert-molded into a portion extending from the cylindrical portion to the upright plate portion and the inner diameter cylindrical portion and joined together, and the seal member is joined to the inner diameter portion, and this inner diameter portion is connected to the outside of the bearing from the detection portion of the rotational speed sensor. Since the rotation speed sensor and the magnetic encoder are not opposed to each other via a steel bar, unlike the conventional case, the rotation speed sensor and the detection unit of the rotation speed sensor are magnetically Because the magnetic encoder is directly facing, its air The gap can be set as small as possible. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that can obtain a high magnetic flux density and improve detection accuracy and reliability.

  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 It is attached to the inner end of the plastic and is formed by injection molding from synthetic resin. And a magnetic encoder made of a rubber magnet in which magnetic powder is mixed in the elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction. The sensor holder is insert-molded, and the exposed portion is a core metal that is press-fitted into the end of the outer member, and an annular member that is integrally joined to the core metal and has a side lip and a radial lip. And a slinger that is press-fitted into the outer diameter of the inner ring so as to face the seal plate, and a pulsar ring that is fitted and fixed to the slinger and has the magnetic encoder provided on the outer diameter portion thereof. A side lip is slidably contacted with the pulsar ring and slinger, the radial lip is slidably contacted with the pulsar ring, and the magnetic encoder is In a wheel bearing device with a rotational speed detection device opposed to a rotational speed sensor via a predetermined radial clearance, an outer diameter cylinder in which the core metal is press-fitted into an end portion of the outer member and a hole is formed , An upright plate portion extending radially inward from the bearing outer side of the outer diameter cylindrical portion, an inner diameter cylindrical portion extending from the upright plate portion toward the bearing inner side, and an inner radial direction from the inner diameter cylindrical portion The sensor holder is insert-molded into a portion extending from the outer diameter cylindrical portion to the upright plate portion and the inner diameter cylindrical portion and joined together, and the seal member is joined to the inner diameter portion. The inner diameter portion is retracted from the detection portion of the rotation speed sensor to the outside of the bearing.

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 of FIG. 1, and FIG. 3 (a) is a seal of FIG. Sectional drawing which shows a board simple substance, (b) is sectional drawing which shows the modification of (a). 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, 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 one (outer side) of the outer raceway surfaces 3a and 3a of the double row on the outer periphery. And a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. . Note that hub bolts 7 a for attaching the wheels are planted at equal circumferential positions of the wheel mounting flanges 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 on the outer periphery with an inner rolling surface 6a facing the other (inner side) of the double row outer rolling surfaces 3a, 3a, and a small diameter step portion 1b of the hub wheel 1 via a predetermined squeezing. It is press-fitted. And it fixes to the hub wheel 1 in the axial direction by the crimping part 1d formed by carrying out the plastic deformation of the edge part of this small diameter step part 1b to radial direction 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 (or spline) 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. Then, the outer joint member 12 is fitted into the hub wheel 1 via the serrations 1c and 18a until the end face of the crimping portion 1d and the shoulder portion 17 come into contact with each other, and by the fixing nut 19 fastened to the male screw 18b. The hub wheel 1 and the outer joint member 12 are unitized so that torque can be transmitted and detachable.

  The sensor holder 20 constituting the rotational speed detection device is attached to the inner side 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 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 pulsar ring 23 is externally fixed to the slinger 22.

  The seal plate 21 includes a cored bar 24 and a seal member 25 integrally joined to the cored bar 24 by vulcanization adhesion or the like. The core metal 24 is formed by pressing 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) as shown in FIG. As shown in a), an outer diameter cylindrical portion 24a that is press-fitted into the end portion of the outer member 3, an inner diameter cylindrical portion 24c that extends in the axial direction from the outer diameter cylindrical portion 24a via a standing plate portion 24b, An inner diameter portion 24d extending radially inward from the inner diameter cylindrical portion 24c, and a seal member 25 is joined to the inner diameter portion 24d. The outer diameter cylindrical portion 24a is formed so as to protrude from the end portion of the outer member 3, and the sensor holder 20, which will be described later, is insert-molded at a portion extending from the outer diameter cylindrical portion 24a to the standing plate portion 24b and the inner diameter cylindrical portion 24c. It is integrally coupled to the cored bar 24. Further, a circular hole 26 for passing a lead wire, which will be described later, is formed in the outer diameter cylindrical portion 24a of the core metal at one place in the circumferential direction. The hole shape of the circular hole 26 is an example, and is not limited to a circle but may be a rectangle or a square.

  The seal plate 34 shown in FIG. 3B is a modification in which a part of the core metal 24 described above is changed. As with the core metal 24 described above, the core metal 35 is pressed with 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). An outer diameter cylindrical portion 35a formed by processing and press-fitted into the end portion of the outer member 3, an inner diameter cylindrical portion 24c extending in the axial direction from the outer diameter cylindrical portion 35a via the upright plate portion 24b, and the inner diameter And an inner diameter part 24d extending radially inward from the cylindrical part 24c.

  Here, a locking portion 36 that is bent radially outward is formed at the end of the outer diameter cylindrical portion 35a, and a plurality of circular holes 26 are formed on the outer peripheral surface of the outer diameter cylindrical portion 35a. . The engaging portion 36 of the outer diameter cylindrical portion 35 a is engaged with the annular groove 3 c formed on the inner periphery of the end portion of the outer member 3. That is, in the assembly process, the outer diameter cylindrical portion 35 a of the core metal 35 is elastically deformed, and the core metal 35 is press-fitted into the outer member 3, and the locking portion 36 of the core metal 35 is the annular groove 3 c of the outer member 3. When the position is reached, the outer diameter cylindrical portion 35a is restored, and the locking portion 36 is engaged with the annular groove 3c. Thereby, even if a vibration or an impact is applied during operation of the vehicle, the core bar 35 can be reliably prevented from moving with respect to the outer member 3, and the detection unit can be prevented from being displaced for a long time. Thus, stable detection accuracy can be maintained.

  In addition, since a plurality of circular holes 26 are formed on the outer peripheral surface of the outer diameter cylindrical portion 35a, the work of wiring the lead wires is made more efficient, and the resin of the sensor holder 20 is placed in all of these circular holes 26. Since it is blocked by entering, even if it is used under severe environmental conditions, it is possible to reliably prevent the sensor holder 20 and the metal core 24 from being insert-molded from peeling off.

  The seal member 25 is made of an elastic member such as synthetic rubber, and is integrally joined to the inner diameter portion 24d of the core metal 24 by vulcanization adhesion or the like, and the side lips 25a and 25b and the inner diameter portion 24d are disposed on both sides of the inner diameter portion 24d. A pair of radial lips 25c and 25d are provided on the inner edge of the.

  The slinger 22 is formed by pressing 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). A cylindrical portion 22a that is press-fitted into the outer diameter of the portion 6b, a vertical plate portion 22b that extends radially outward from the cylindrical portion 22a, and a corner portion of the vertical plate portion 22b that are integrally joined by vulcanization adhesion or the like. And an elastic lip 22c. The elastic lip 22c is in elastic contact with the end surface of the inner ring 6 to prevent moisture such as rainwater from entering the bearing from the fitting portion between the slinger 22 and the inner ring 6.

  The pulsar ring 23 includes a support member 27 that is press-fitted into the slinger 22 and a magnetic encoder 28 that is integrally joined to the support member 27 by vulcanization adhesion. The support member 27 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like), and is pressed. A cylindrical inner diameter portion 27a formed by machining and press-fitted into the cylindrical portion 22a of the slinger 22, a standing plate portion 27b extending radially outward from the inner diameter portion 27a, and a bearing inward side from the standing plate portion 27b And has a cylindrical outer diameter portion 27 c formed slightly larger in diameter than the large diameter portion 6 c of the inner ring 6. The magnetic encoder 28 is joined to the outer diameter portion 27c. This magnetic encoder 28 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, and a rotary encoder for detecting the rotational speed of a wheel is used. It is composed. Thereby, coupled with the characteristics of the support member 27 made of a ferromagnetic material, the output signal becomes strong and stable detection accuracy can be ensured.

  The side lips 25a and 25b of the seal member 25 are slidably contacted with the slinger 22 and the standing plate portions 22b and 27b of the support member 27, and the pair of radial lips 25c and 25d are slidably contacted with the cylindrical portion 27a of the support member 27, respectively. Has been. By configuring such a seal 11, it is possible to improve sealing performance and prevent the pulsar ring 23 from being contaminated by rainwater, dust, or the like.

  The sensor holder 20 is formed of a non-magnetic resin material such as polyphenylene sulfide (PPS), and a rotational speed sensor 29 facing the magnetic encoder 28 via a predetermined radial clearance is embedded. The rotational speed sensor 29 includes a magnetic detection element 29a such as a Hall element, a magnetoresistive element (MR element), etc., whose characteristics change according to the flow direction of magnetic flux, and an output waveform of the magnetic detection element 29a via a lead wire 29b. IC 29c incorporating a waveform shaping circuit for adjusting the above. The embodiment of the rotation speed sensor 29 in FIG. 2 shows an example, and an IC in which the magnetic detection element 29a and the waveform shaping circuit 29c are integrated may be used.

  The sensor holder 20 is opposed to the end surface of the outer member 3 through a slight axial clearance, and an annular recess 30 is formed so as to expose a part of the outer cylindrical portion 24a of the cored bar 24. ing. An O-ring 31 is elastically mounted in the recess 30 to prevent foreign matters such as rainwater and dust from entering from the fitting portion between the core metal 24 and the outer member 3 and the joint portion between the core metal 24 and the sensor holder 20. It is preventing. Further, a disc-like cover 32 having a hole diameter smaller than the outer diameter of the slinger 22 is attached to the inner end face of the sensor holder 20, and a labyrinth seal is configured between the outer joint member 12 and the slinger 22. Yes. Thereby, it is possible to prevent foreign matters such as rainwater and dust from directly entering the slinger 22 and to further improve the sealing performance. 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.

  Here, in the present embodiment, as described above, the core metal 24 is press-fitted into the end portion of the outer member 3, and the outer diameter cylindrical portion 24a is radially inserted from the bearing outer side of the outer diameter cylindrical portion 24a. A sensor holder having an upright plate portion 24b extending inward, an inner diameter cylindrical portion 24c extending from the upright plate portion 24b toward the bearing inward side, and an inner diameter portion 24d extending inward in the radial direction from the inner diameter cylindrical portion 24c; 20 is insert-molded at a portion extending from the outer diameter cylindrical portion 24a to the upright plate portion 24b and the inner diameter cylindrical portion 24c, and is integrally joined. A seal member 25 is joined to the inner diameter portion 24d, and the inner diameter portion 24d rotates. It is retracted from the magnetic detection element (detection unit) 29a of the speed sensor 29 to the outside of the bearing.

  By adopting the cored bar 24 having such a configuration, the rotational speed sensor and the magnetic encoder are not opposed to each other via the steel bar made of the steel plate as in the prior art. Since 28 directly faces, the radial clearance (air gap) can be set as small as possible. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that can obtain a high magnetic flux density and improve detection accuracy and reliability.

  Furthermore, in this embodiment, since the circular hole 26 for passing the lead wire 29b is formed in the outer diameter cylindrical portion 24a (35a) of the core metal 24 (35), the lead wire is wired avoiding the core metal. There is no need to connect the magnetic detection element 29a and the IC 29c with the shortest distance, and the reliability of the rotational speed sensor 29 can be improved. Then, after connecting the IC 29c and the harness (not shown), the resin of the sensor holder 20 enters and is closed in the circular hole 26, so that it is exposed to a harsh environment in which muddy water or salt water is splashed. Even when used under severe conditions such as repeated high and low temperatures, the adhesion between the resin-made sensor holder 20 and the cored bar 24 can be secured, and the insert-molded sensor holder 20 is removed from the cored bar 24. Separation can be prevented over a long period of time.

  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.

  A wheel bearing device with a rotational speed detection device according to the present invention includes a sensor holder that is insert-molded into a core metal that constitutes a seal and in which a rotational speed sensor is embedded, and the core metal exposed from the sensor holder is outward. The present invention can be applied to a wheel bearing device that is press-fitted into an end portion of a member.

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 sectional drawing which shows the sealing plate single-piece | unit based on this invention. (B) is sectional drawing which shows the modification of (a). 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 3c ... .... Inner member 5 ... Rolling element 6 ... Inner ring 6b ... ..... Small diameter part 6c ..... Large diameter part 7 ... ..Wheel mounting flange 7a ... Hub bolt 7b ... Base 8 ...・ ・ ・ ・ ・ ・ Constant velocity universal joint 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer seal 11・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side seal 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Joint inner ring 14 ... Cage 15 ... Torque transmission ball 16 ...・ ・ ・ ・ ・ ・ ・ ・ Mouse 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 18 ・ ・ ・ ・ ・ ・ ・ ・ Shaft 18b ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male screw 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Solid Nut 20 ... Sensor holder 21, 34 ... Seal plate 22 ... ··· Slinger 22a ·················· Cylindrical portions 22b, 24b, 27b ········································· Lip 23 ... Pulsar ring 24, 35 ... Core metal 24a, 35a ... Outer diameter Cylindrical portion 24c ..... Inner diameter cylindrical portion 24d, 27a ..... Inner diameter portion 25...・ Seal members 25a, 25b ... Side lips 25c, 25d ... Radial lip 26 ... Circle Hole 27 ... ... support member 27c ... outer diameter part 28 ... magnetic encoder 29 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 29a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic detection element 29b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Lead wire 29c ... IC
30 ... Recess 31 ... O-ring 32 ... .... Disc-shaped cover 33 ......... Locking part 36 ......... Locking part 50 ... .......... rotational speed detector equipped wheel support bearing assembly 51 ............... outer member 51a ...........・ ・ ・ Outer rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 53 ・ ・ ・ ・ ・ ・... Inner member 54 ... Rotational speed detector 55 ... Hub wheel 55a , 56a ... Inner rolling surface 55b ... Small diameter step 56 ... inner ring 56b ... small diameter part 56c ... large Diameter part 57 ... Wheel mounting flange 58 ... Cage 59 ...・ ・ ・ ・ ・ Outer side seal 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side seal 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic sensor 62 ・ ・... Sensor holder 63 ... First seal ring 64 ...・ ・ Second seal ring 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core metal 65a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder part 65b for fitting ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Outer flange 65c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Moisture entry prevention cylindrical part 65d ..... Inner flange part 66 ..... Seal member 66a ... Slinger side lip 66b, 66c Radial lip 66d ... Pulsar side lip 67 ··············· Slinger 67a ············································· Part 68 ... Pulsar ring 69 ... Elastic seal 69a ...・ Axial lip 70 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Supporting member 70a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter cylindrical part 70b ・ ・ ・ ・ ・ ・ ・ ・...・ Connecting part 70c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Large-diameter cylindrical part 71 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetized body 72 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Recess 73 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ O-ring 74 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Disk

Claims (6)

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 by injection molding from synthetic resin, and embedded with a rotational speed sensor;
A magnetic encoder whose characteristics in the circumferential direction change alternately and at equal intervals,
The seal on the inner side of the seal is formed by insert molding the sensor holder, and the exposed portion is press-fitted into the end of the outer member, and the core metal is integrally joined to the side lip, An annular seal plate composed of a seal member integrally having a radial lip, a slinger that is press-fitted into the outer diameter of the inner ring so as to face the seal plate, and is fitted and fixed to the slinger, and the magnetic A pulsar ring provided with an encoder, the side lip is in sliding contact with the pulsar ring and slinger, and the radial lip is in sliding contact with the pulsar ring;
In the wheel bearing device with a rotational speed detection device, wherein the magnetic encoder is opposed to the rotational speed sensor via a predetermined radial clearance,
An outer diameter cylindrical portion in which the core metal is press-fitted into an end portion of the outer member, a standing plate portion extending radially inward from a bearing outer side of the outer diameter cylindrical portion, and a bearing from the standing plate portion An inner diameter cylindrical portion extending inward and an inner diameter portion extending radially inward from the inner diameter cylindrical portion, and the sensor holder is inserted into a portion extending from the outer diameter cylindrical portion to the standing plate portion and the inner diameter cylindrical portion. The seal member is molded and joined together, and the seal member is joined to the inner diameter portion, and the inner diameter portion is retracted from the detection portion of the rotational speed sensor and arranged outside the bearing. Wheel bearing device with rotation speed detector.   The magnetic encoder is composed of a rubber magnet in which magnetic powder is mixed in an elastomer and the magnetic poles N and S are alternately magnetized in the circumferential direction, and the rotational speed sensor changes its characteristics according to the flow direction of the magnetic flux. And an IC incorporating a waveform shaping circuit for adjusting the output waveform of the magnetic detection element through a lead wire, and a hole for passing the lead wire through the outer diameter cylindrical portion of the cored bar. The wheel bearing apparatus with a rotational speed detection apparatus of Claim 1 currently formed.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein a plurality of holes are formed in the outer diameter cylindrical portion of the cored bar.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 3, wherein the sensor holder is made of a non-magnetic synthetic resin.   An annular groove is formed on the inner periphery of the end of the outer member, and an engaging portion bent radially outward is formed at the end of the outer diameter cylindrical portion of the core metal. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein the wheel bearing device is engaged with the annular groove.   A small-diameter portion and a large-diameter portion are formed on the outer diameter of the inner ring, the cylindrical portion of the slinger is press-fitted into the small-diameter portion, and the pulsar ring is formed by pressing a ferromagnetic steel plate, and the slinger A cylindrical inner diameter portion that is press-fitted into the cylindrical portion, a standing plate portion that extends radially outward from the inner diameter portion, and extends from the standing plate portion toward the bearing inward side, and slightly more than the large diameter portion of the inner ring. A rotation speed according to any one of claims 1 to 5, further comprising a support member having a cylindrical outer diameter portion formed in a large diameter, wherein the magnetic encoder is integrally joined to the outer diameter portion of the support member. Wheel bearing device with detection device.

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