JP5132209B2 - Wheel bearing device with rotation speed detector - Google Patents

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. 6 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.

  As shown in FIG. 7, the rotational speed detection device 54 includes a sensor holder 62 in which a magnetic sensor 61 is embedded, and a seal 60 attached to the sensor holder 62. The sensor holder 62 is molded from synthetic resin by injection molding, and is insert-molded on a core metal 65 constituting the seal 60. 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. 6).

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. Thus, 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 male connector 70 for connecting the magnetic sensor 61 and the harness connected to the electronic circuit of the vehicle body is provided at a predetermined circumferential position of the sensor holder 62. Since it is integrally formed in a state protruding outward in the direction, the connector 70 interferes with the knuckle during assembly into the knuckle. Therefore, it is necessary to consider the shape of the knuckle to avoid interference with the connector 70. In this case, there is a problem that the existing knuckle cannot be used as it is and the standardization of the knuckle is hindered.

  Further, in this type of wheel bearing device 50 with the rotational speed detection device, when the length of the harness connected to the vehicle body becomes long, vibration is generated in the harness during traveling. Due to this vibration, stable speed detection cannot be obtained, and the durability of the harness itself may be reduced. Furthermore, the influence of this vibration may cause the sensor holder 62 to come out of the outer member 51, thereby impairing the sealing performance and lowering the speed detection reliability.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances. A wheel with a rotational speed detection device that improves assembling without changing peripheral parts and improves reliability by stable speed detection. An object of the present invention is to provide a bearing device for a vehicle.

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 of rolling elements 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 side end and formed by injection molding from synthetic resin, the rotational speed And a sensor holder in which a seal is embedded, and an inner seal of the seals is integrally joined to the end of the outer member by vulcanization bonding. An annular seal plate made of a sealed member, and a pulsar ring that is mounted on the inner ring so as to face the seal plate and has a detected portion in which characteristics in the circumferential direction change alternately and at equal intervals, In the wheel bearing device with a rotation speed detection device in which the detection unit and the rotation speed sensor face each other through a predetermined air gap, a harness that connects the rotation speed sensor and the electronic circuit of the vehicle body from a predetermined circumferential position of the sensor holder is taken Rutotomoni locking portion are integrally formed by injection molding on the side surface of the inner side of the sensor holder, the harness is attached to the engaging portion is elastically deformed And it is fixed in close contact with the side surface of the inner side of the sensor holder.

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 side end of the outer member are formed by injection molding from a synthetic resin. And a sensor holder in which the rotational speed sensor is embedded, and the inner seal of the seals is a core metal fitted to the end of the outer member, and the core metal is integrally formed by vulcanization adhesion An annular seal plate made of bonded seal members and a pulsar ring that is mounted on the inner ring facing the seal plate and has a detected portion whose characteristics in the circumferential direction change alternately and at equal intervals, are detected In the wheel bearing device with a rotation speed detection device in which the rotation speed sensor and the rotation speed sensor are opposed to each other through a predetermined air gap, a rotation speed sensor and an electronic circuit of the vehicle body are connected from a predetermined circumferential position of the sensor holder. Scan is taken Rutotomoni locking portion are integrally formed by injection molding on the side surface of the inner side of the sensor holder, the locking portion is elastically deformed wearing the harness, the side surface of the inner side of the sensor holder Since it is fixed in close contact, the length of the harness extending in the circumferential direction from the sensor holder can be shortened as much as possible, and no vibration is generated in the harness during traveling. Therefore, the harness can be fixed with a single touch, improving the assembly, improving the durability of the harness, and preventing the sensor holder from coming out of the outer member due to the influence of vibration. It is possible to provide a wheel bearing device with a rotational speed detection device that is improved in reliability.

Further, as in the invention described in claim 2 , a takeout port is formed at a predetermined circumferential position of the sensor holder so as to protrude to the inner side, and a harness directly connected to the rotation speed sensor is connected to the takeout port. It may be molded integrally and a connector may be connected to the end of this harness.

Further, as in a third aspect of the invention, a connector may be integrally formed so as to protrude in a tangential direction of the sensor holder, and the harness may be connected to the connector.

According to a fourth aspect of the present invention, the inner-side seal includes a slinger that is opposed to the core bar and has a substantially L-shaped cross section, and the slinger has an outer diameter of the inner ring. And a vertical plate extending radially outward from the cylindrical portion, and the pulsar ring is press-fitted and fixed to the cylindrical portion, and magnetic powder is applied to the elastomer on the outer diameter portion of the pulsar ring. The magnetic encoder with magnetic poles N and S magnetized alternately in the circumferential direction is joined together by vulcanization, and side lips and radial lips formed integrally with the seal member are connected to the pulsar ring and slinger. If they are in sliding contact with each other, it is possible to prevent the magnetic encoder from being contaminated by dust, etc. Because it is isolated from the contact surface, can be a metal abrasion powder generated by the rotation of the rolling elements are prevented from adhering to the magnetic encoder, it is possible to avoid a reduction in detection accuracy.

Further, as in the invention described in claim 5 , the core metal is formed of an austenitic stainless steel plate, and the sensor holder is integrally insert-molded on the outer diameter portion of the core metal, and the core metal If a part of the outer diameter is exposed and fitted into the end of the outer member, the rotational speed sensor can be detected with high reliability without adversely affecting the sensing performance of the rotational speed sensor, and a strong removal can be achieved. It has proof stress and can raise the airtightness of a fitting part.

If the pulsar ring is formed of a ferromagnetic steel plate as in the invention described in claim 6 , the output signal becomes strong, and stable detection accuracy can be ensured.

If the sensor holder is formed of a nonmagnetic synthetic resin material to which a reinforcing material is added as in the invention described in claim 7, it does not adversely affect the sensing performance of the rotational speed sensor, and It has excellent corrosion resistance and can improve strength and durability over a long period of time.

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 mounted on the part and formed by injection molding from synthetic resin. A seal holder including an embedded sensor holder, an inner seal of the seals fitted into an end of the outer member, and a seal integrally joined to the core by vulcanization adhesion An annular seal plate made of a member, and a pulsar ring that is mounted on the inner ring so as to face the seal plate and has a detected portion in which characteristics in the circumferential direction change alternately and at equal intervals, and the detected portion In a wheel bearing device with a rotation speed detection device in which a rotation speed sensor is opposed to a predetermined air gap, a harness connecting the rotation speed sensor and an electronic circuit of a vehicle body is taken out from a predetermined circumferential position of the sensor holder. Rutotomoni, wherein the engaging portion is formed integrally by injection molding on the side surface of the inner side of the sensor holder, the harness is attached to the engaging portion is elastically deformed, the Since it is fixed in close contact with the inner side surface of the sensor holder, the length of the harness extending in the circumferential direction from the sensor holder can be shortened as much as possible, and vibration is generated in the harness during traveling. There is nothing. Therefore, the harness can be fixed with a single touch, improving the assembly, improving the durability of the harness, and preventing the sensor holder from coming out of the outer member due to the influence of vibration. It is possible to provide a wheel bearing device with a rotational speed detection device that is improved in 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 The rotation speed sensor is attached to the inner side end of the plastic and formed by injection molding from synthetic resin. A sensor holder embedded in the seal, the inner seal of the seal is insert-molded integrally with the sensor holder, the exposed outer diameter portion is fitted to the inner periphery of the end of the outer member, An annular seal plate made of a metal core formed by pressing from a steel plate and a seal member integrally joined to the metal core by vulcanization adhesion, and press-fitted into the outer diameter of the inner ring facing the seal plate A slinger having a substantially L-shaped cross section and a pulsar ring press-fitted and fixed to the cylindrical portion of the slinger, and magnetic powder is mixed into the elastomer at the outer diameter portion of the pulsar ring and alternately in the circumferential direction. A magnetic encoder in which magnetic poles N and S are magnetized is integrally joined by vulcanization adhesion, and the rotational speed at which the magnetic encoder and the rotational speed sensor are opposed to each other through a predetermined radial clearance. In detector equipped wheel support bearing assembly, it said that the predetermined circumferential position of the sensor holder retrieved harness for connecting the electronic circuitry of the rotational speed sensor and the vehicle body Rutotomoni, engaged by injection molding on the side surface of the inner side of the sensor holder A stop portion is formed integrally, and the locking portion is elastically deformed to attach the harness, and is fixed in a state of being in close contact with the inner side surface of the sensor holder.

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 showing a detection unit of FIG. 1, and FIG. FIG. 4 is a fragmentary sectional view taken along line 1V-IV in FIG. 3, and FIG. 5 is a fragmentary sectional view showing a modification of FIG. 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 includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and a double-row rolling element (ball ) 4 and 4, and an outer member 5 inserted through 4 and 4, and a constant velocity universal joint 10 is connected to the outer member 5.

  The inner member 3 includes a hub ring 1 and an inner ring 2 fixed to the hub ring 1. The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, an inner side rolling surface 1a on the outer side (one side) on the outer periphery, and this inner side rolling. A cylindrical small-diameter step portion 1b extending in the axial direction from the surface 1a is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. A hub bolt 6a for fastening the wheel is planted at the circumferentially equidistant position of the wheel mounting flange 6.

  The hub wheel 1 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 on which an outer seal 8 to be described later comes into sliding contact. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the base 6b to 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 2 has an inner side (other side) inner raceway surface 2a formed on the outer periphery, and is press-fitted into the small-diameter step portion 1b of the hub ring 1 through a predetermined shimoshiro. 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 2 and the rolling element 4 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.

  The outer member 5 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 5b for being attached to a knuckle (not shown) constituting a suspension device is integrally formed on the outer periphery. And double row outer rolling surfaces 5a and 5a facing the double row inner rolling surfaces 1a and 2a of the inner member 3 are integrally formed on the inner periphery. And these double row outer side rolling surfaces 5a and 5a are hardened by induction hardening in the range of the surface hardness of 58-64HRC.

  Between the double-row outer raceway surfaces 5a and 5a of the outer member 5, and the inner raceway surface 1a of the hub wheel 1 and the inner raceway surface 2a of the inner ring 2 facing these, the double-row rolling elements 4 and 4 are arranged. Is held by the cages 7 and 7 so as to be freely rollable. The end surface on the small diameter side (front side) of the inner ring 2 abuts against 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. In addition, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The constant velocity universal joint 10 includes an outer joint member 11, a joint inner ring 12, a cage 13, and a torque transmission ball 14. The outer joint member 11 integrally includes a cup-shaped mouth portion 15, a shoulder portion 16 that forms the bottom portion of the mouth portion 15, and a shaft portion 17 that extends from the shoulder portion 16 in the axial direction. A serration (or spline) 17a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 17, and a male screw 17b is formed at the end of the serration 17a. The shaft portion 17 of the outer joint member 11 is fitted into the hub wheel 1 through the serrations 1c and 17a until the end surface of the crimping portion 1d and the shoulder portion 16 abut each other, and is fixed to the male screw 17b. Thus, the hub wheel 1 and the outer joint member 11 are unitized so that torque can be transmitted and detachable.

  Here, in the present embodiment, the sensor holder 19 is attached to the inner side end of the outer member 5. The inner seal 9 is attached to an opening of an annular space formed between the sensor holder 19 and the inner ring 2. As shown in an enlarged view in FIG. 2, the seal 9 includes an annular seal plate 20 and a slinger 21 having a substantially L-shaped cross section, and is disposed to face each other. The seal plate 20 includes a core metal 22 in which the sensor holder 19 is molded and an exposed portion is fitted into the end of the outer member 5, and a seal integrally joined to the core metal 22 by vulcanization bonding or the like. It consists of member 23. A pulsar ring 24 is fitted on the slinger 21.

  The core metal 22 is made of austenitic stainless steel (JIS standard SUS304, etc.), ferritic stainless steel (JIS standard SUS430, etc.), or a rust-proof cold rolled steel (JIS standard SPCC). A cylindrical portion 22a in which the sensor holder 19 is molded, and an inner diameter portion 22b extending radially inward from the cylindrical portion 22a. A part of the cylindrical portion 22 a that is partially exposed is fitted into the end of the outer member 5. Thereby, it can have a strong proof strength and can improve the airtightness of the fitting portion. 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 seal member 23 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber) and is integrally joined to the inner diameter portion 22b of the core metal 22 by vulcanization adhesion. The seal member 23 integrally includes a side lip 23a and a pair of radial lips 23b and 23c.

  The slinger 21 is an austenitic stainless steel plate (JIS standard SUS304 type or the like), a ferritic stainless steel plate (JIS standard SUS430 type or the like), or a rust-proof cold rolled steel plate (JIS standard SPCC type). Etc.) is formed by pressing, and has a cylindrical portion 21a that is press-fitted into the outer diameter of the inner ring 2, and a standing plate portion 21b that extends radially outward from the cylindrical portion 21a.

  The pulsar ring 24 includes a cored bar 26 that is press-fitted into the slinger 21 and a magnetic encoder 27 that is integrally joined to the cored bar 26 by vulcanization adhesion. The metal core 26 of the pulsar ring 24 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). A cylindrical inner diameter portion 26a having a substantially U-shaped cross section formed by press working and press-fitted into the cylindrical portion 21a of the slinger 21, and a standing plate portion 26b extending radially outward from the inner diameter portion 26a, An outer diameter portion 26c extending in the axial direction from the standing plate portion 26b is provided, and a magnetic encoder 27 is integrally joined to the outer diameter portion 26c by vulcanization adhesion. The side lip 23 a of the seal member 23 is slidably contacted with the standing plate portion 26 b of the core metal 26 of the pulsar ring 24, and the pair of radial lips 23 b and 23 c are slidably contacted with the cylindrical portion 21 a of the slinger 21.

  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. doing. Thereby, combined with the ferromagnetic cored bar 26, the output signal becomes strong, and stable detection accuracy can be ensured.

  Further, by configuring such a seal 9, it is possible to prevent the pulsar ring 24 from being contaminated by dust or the like, and the rolling element 4 by the side lip 23 a and the radial lips 23 b and 23 c of the seal plate 20 slidably contacting the pulsar ring 24. And since it is isolated from each rolling surface, it can prevent that metal abrasion powder etc. which arise by rotation of the rolling element 4 adhere to the magnetic encoder 27, and can avoid the fall of detection accuracy.

  The sensor holder 19 is formed by injection molding by adding a reinforcing material such as GF (glass fiber) to a non-magnetic resin material such as polyphenylene sulfide (PPS). A rotation speed sensor 28 is embedded in the magnetic encoder 27 so as to confront the magnetic encoder 27 via a predetermined radial clearance (air gap). As a result, the sensing performance of the rotation speed sensor 28 is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time. The rotational speed sensor 28 includes a magnetic detection element 28a such as a Hall element, a magnetoresistive element (MR element), etc. whose characteristics change according to the direction of flow of magnetic flux, and an output waveform of the magnetic detection element 28a via a lead wire 28b. IC 28c incorporating a waveform shaping circuit for adjusting the frequency. Thereby, it is possible to detect the rotational speed with high reliability at low cost. The sensor holder 19 can be exemplified by synthetic resin such as PA (polyamide) 66 and polybutylene terephthalate (PBT) other than the materials described above. The embodiment of the rotation speed sensor 28 in FIG. 2 shows an example, and an IC in which the magnetic detection element 28a and the waveform shaping circuit 28c are integrated may be used.

  Here, as shown in FIG. 3, a take-out port 29 is formed at a predetermined circumferential position (upper part in the vertical direction in the figure) of the sensor holder 19 so as to protrude to the inner side. The harness 25 that is directly connected to the IC 28 c of the rotation speed sensor 28 is molded integrally with the take-out port 29. A male connector 30 for connecting a harness (not shown) connected to the electronic circuit of the vehicle body is connected to the end of the harness 25. A clip 31 for fixing the harness 25 to the side surface of the sensor holder 19 is integrally locked with an attachment angle up to the take-out port 29 within 90 °. Thereby, the length of the harness 25 extending along the circumferential direction from the sensor holder 19 can be shortened as much as possible, and vibration is prevented from being generated in the harness 25 during traveling. Therefore, the durability of the harness 25 is improved, and the sensor holder 19 is prevented from coming out of the outer member 5 due to the influence of vibration, and the wheel with a rotational speed detection device is designed to improve reliability by stable speed detection. A bearing device can be provided.

  The clip 31 is formed by pressing an austenitic stainless steel sheet (JIS standard SUS304 series, etc.) or a rust-proof cold rolled sheet (JIS standard SPCC series, etc.) into a substantially U-shaped cross section. As shown in FIG. 4, it is integrally fixed to the sensor holder 19 at the time of injection molding. And by bending both ends of the clip 31 as shown by the arrows, the harness 25 can be fixed to the side surface of the sensor holder 19 easily and in close contact, and the harness 25 vibrates during traveling. Can be reliably prevented.

  Here, the configuration in which the take-out port 29 is formed so as to protrude toward the inner side of the sensor holder 19 and the harness 25 is directly molded, and the connector 30 is connected to the end of the harness 25 is illustrated. Although not shown, a connector is integrally formed so as to protrude in the tangential direction of the sensor holder, and a harness connected to the electronic circuit of the vehicle body is connected to this connector, and this harness is fixed to the side surface of the sensor holder with a clip. You may do it.

  The means for fixing the harness 25 to the sensor holder 19 is not limited to such a clip 31, and for example, means shown in FIG. As for this sensor holder 32, the latching | locking part 33 is integrally formed by the side surface by injection molding. The locking portion 33 has an arcuate recess 33a formed to be slightly smaller in diameter than the outer diameter of the harness 25, and the harness 25 is attached to the recess 33a. As a result, the harness 25 can be mounted in the recess 33a with a single touch only by elastically deforming the locking portion 34, and the harness 25 is easily fixed to the side surface of the sensor holder 32 in a state of being in close contact with the sensor holder 32. Therefore, the assemblability can be improved.

  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 including a gear, a magnet, and an annular coil wound around.

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

  The wheel bearing device with a rotational speed detection device according to the present invention can be applied to a wheel bearing device including a resin sensor holder that is mounted on an end of an outer member and in which a rotational speed sensor is embedded. it can.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. It is a perspective view along the III-III line of FIG. It is principal part sectional drawing along the IV-IV line of FIG. It is principal part sectional drawing which shows the modification of FIG. 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, 2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・.... Small diameter step 1c, 17a ... Serration 1d ... Caulking part 2 ...・ ・ ・ ・ ・ ・ ・ ・ Inner ring 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 5 ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 5b ・ ・ ・ ・ ・ ・··· Body mounting flange 6 ········· Wheel mounting flange 6a ··················· Hub bolt 6b・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Outer side seal 9 ... Inner side seal 10 ... Constant velocity universal joint 11- ..... Outer joint member 12 .... Fitting inner ring 13・ Cage 14 ・ ・ ・ ・ ・ ・ Torque transmission ball 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse 16・ ・ ・ ・ ・ Shoulder 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shaft 17b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male thread 18 ・ ・ ・ ・ ・ ・ ・ ・..... Fixing nuts 19 and 32 .... Sensor holder 20 ..... Seal plate 21 ... ... Slinger 21a, 22a ... Cylindrical part 21b, 26b ... Standing plate part 22, 26 ... Core metal 22b, 26a ... Inner diameter part 23 ... Seal member 23a ... Side lip 23b, 23c ... Radial lip 24 ... Pulsar ring 25 ... Harness 26c ... Outside Diameter part 27 ... Magnetic encoder 28 .... Magnetic detection element 28b ... Lead wire 28c ... IC
29 ... Take-out port 30 ... Connector 31 ... · Clip 33 ··········· Locking portion 33a ·········································· .... Wheel bearing device 51 with rotational speed detection device ... Outer member 51a ... Outward rolling Surface 51b ... Body mounting flange 52 ... Ball 53 ... .... Inner member 54 ... Rotation speed detector 55 ... Hub wheels 55a, 56a ...・ ・ ・ ・ ・ ・ Inner rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 5c ... Serration 56 ... Inner ring 57 ... Wheel Mounting flange 58 ·········· Retainer 59 ·············· Outer seal 60 .... Inner side seal 61 ..... Magnetic sensor 62 ..... Sensor holder 63 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First seal ring 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Second seal ring 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Core metal 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 66a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 66b, 66c ・ ・ ・ ・ ・ ・.... Radial lip 67 ... ········· Slinger 67a ····································································・ ・ ・ ・ ・ ・ ・ Pulsar ring 68a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner diameter 68c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer diameter 69 ・ ・············· Multipolar magnet rotor 70 ······· Connector θ

Claims (7)

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 extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step 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 from a synthetic resin by injection molding, and embedded with a rotational speed sensor;
Of the seals, an inner seal is a core metal fitted to the end of the outer member, and an annular seal plate made up of a seal member integrally joined to the core metal by vulcanization adhesion, A pulsar ring, which is mounted on the inner ring facing the seal plate and has a detected part in which the characteristic in the circumferential direction changes alternately and at equal intervals,
In the wheel bearing device with a rotational speed detection device in which the detected portion and the rotational speed sensor are opposed to each other through a predetermined air gap,
Wherein the predetermined circumferential position of the sensor holder rotation speed sensor and the vehicle body harness connecting electronic circuitry is taken out Rutotomoni locking portion by injection molding on the side surface of the inner side of the sensor holder is formed integrally with the A wheel bearing device with a rotational speed detection device , wherein the locking portion is elastically deformed, the harness is mounted, and is fixed in close contact with the inner side surface of the sensor holder. A take-out opening is formed at a predetermined circumferential position of the sensor holder so as to protrude to the inner side, and a harness directly connected to the rotation speed sensor is molded integrally with the take-out opening, and a connector is attached to the end of the harness. rotational speed detector equipped wheel support bearing assembly according to claim 1 connected. The wheel bearing device with a rotational speed detection device according to claim 1 or 2 , wherein a connector is integrally formed so as to protrude in a tangential direction of the sensor holder, and the harness is connected to the connector. The inner-side seal is provided with a slinger disposed opposite to the cored bar and having a substantially L-shaped cross section. The slinger is press-fitted into the outer diameter of the inner ring, and a diameter from the cylindrical portion. The pulsar ring is press-fitted and fixed to the cylindrical portion, and magnetic powder is mixed into the elastomer at the outer diameter portion of the pulsar ring, and magnetic poles N and S are alternately arranged in the circumferential direction. with magnetized magnetic encoder is integrally joined by vulcanization bonding, rotation according to claim 1 integrally formed side lip and a radial lip is in sliding contact respectively with the pulsar ring and the slinger into the sealing member Wheel bearing device with speed detector. The cored bar is formed of an austenitic stainless steel plate, the sensor holder is integrally insert-molded on the outer diameter part of the cored bar, and the outer member is partially exposed to the outer member. The wheel bearing device with a rotational speed detection device according to claim 1 , which is fitted into an end of the wheel. The wheel bearing device with a rotation speed detection device according to claim 1 or 4 , wherein the pulsar ring is formed of a ferromagnetic steel plate. The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 3 and 5 , wherein the sensor holder is formed of a nonmagnetic synthetic resin material to which a reinforcing material is added.

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