JP2008286573A - Bearing device for wheel with rotational speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotational speed detection device compactible at low cost, having high reliability, capable of improving detection accuracy. <P>SOLUTION: This device for the wheel with the rotational speed detection device is equipped with: a sensor holder 23 composed of a fitting ring 25 made of a steel plate, and a holding part 26 resin-molded thereon and having a rotational speed sensor 15 embedded therein; a base 21 fitted externally with an inner ring 6; a magnetic encoder 22 bonded thereto; and a seal 27 composed of a seal plate 16 mounted between a cylindrical part 25a of the fitting ring 25 and the inner ring 6, and a slinger 28. In the device, the seal 27 and the magnetic encoder 22 are disposed across the holding part 26, and the magnetic encoder 22 is confronted to the rotational speed sensor 15 through a prescribed axial direction clearance A. In the device, a recessed portion 30 is formed on the end inner periphery of an outer member 24, and the base 21 is stored therein, and an axial direction clearance δ is formed between the base 21 and the slinger 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotational speed detection device that rotatably supports a wheel of an automobile or the like and incorporates a rotational speed detection device that detects the rotational speed of the wheel.

  Rotation speed detection device with built-in rotation speed detection device to detect the rotation speed of the wheel to control the anti-lock brake system (ABS) while supporting the wheel of the automobile rotatably with the suspension system Wheel 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. In the wheel bearing device with a rotational speed detection device, a sensor holder 52 is attached to an end portion of the outer member 51. The sensor holder 52 includes a fitting ring 53 formed in an annular shape and a holding portion 54 coupled to the fitting ring 53. The fitting ring 53 includes a cylindrical fitting portion 53a that is press-fitted into the outer periphery of the outer member 51, a flange portion 53b that extends radially inward from the fitting portion 53a, and an axial direction from the flange portion 53b. The cylinder portion 53c extends. And the perforation 55 is formed in the circumferential direction of the cylindrical part 53c, and the holding | maintenance part 54 is integrally molded by the synthetic resin. A rotation speed sensor 57 that faces the magnetic encoder 56 via a predetermined axial clearance is embedded in the holding portion 54.

  The seal 58 is attached to the sensor holder 52 and the inner ring 59, and includes annular first and second seal plates 60 and 61 each having a substantially L-shaped cross section, and is disposed to face each other. The second seal plate 61 includes a cylindrical portion 61a fitted on the inner ring 59, a standing plate portion 61b extending radially outward from the cylindrical portion 61a, and an annular tongue piece extending in the axial direction from the standing plate portion 61b. 61c. A slight radial clearance is formed between the tongue piece 61 c and the cylindrical portion 53 c of the fitting ring 53, thereby forming a labyrinth seal 65.

  On the other hand, the first seal plate 60 includes a cored bar 62 fitted in the cylindrical portion 53c of the fitting ring 53, and a seal member 63 vulcanized and bonded to the cored bar 62. The side lip 63a, the grease lip 63b, and the intermediate lip 63c are integrally provided. The side lip 63a is in sliding contact with the standing plate portion 61b of the second seal plate 61, and the grease lip 63b and the intermediate lip 63c are in sliding contact with the cylindrical portion 61a.

  Further, a steel plate base 64 is disposed on the opposite side of the seal 58 across the holding portion 54 of the sensor holder 52. The base 64 includes a cylindrical portion 64a that is externally fitted to the inner ring 59, and a standing plate portion 64b that extends radially outward from the cylindrical portion 64a, and has a substantially L-shaped cross section. The magnetic encoder 56 is integrally vulcanized and bonded to the side surface of the standing plate portion 64b on the bearing outer side.

Thus, in the conventional wheel bearing device with a rotational speed detection device, the rotational speed sensor 57 is disposed in the annular sensor holder 52, and the seal 58 is fitted inside the rotational speed sensor 57 on the outer side of the bearing. Therefore, even during actual running, which is a harsh environment, foreign matter such as magnetic powder can be prevented from entering between the magnetic encoder 56 and the detection unit of the rotation speed sensor 57 from the outside.
Japanese Patent Laying-Open No. 2005-300289

  In such a conventional wheel bearing device with a rotational speed detecting device, the base 64 to which the magnetic encoder 56 is joined is preliminarily fitted onto the inner ring 59 and the sensor holder 52 is attached to the outer member 51, and finally the seal 58. Is installed. However, in this case, there is a possibility that the base 64 moves due to the cylindrical portion 61a of the second seal plate 61 coming into contact with the cylindrical portion 64a of the base 64. At this time, the movement of the base 64 changes the air gap A between the magnetic encoder 56 and the rotation speed sensor 57 and becomes larger, so that the lines of magnetic force from the magnetic encoder 56 may decrease and the detection accuracy may decrease.

  Here, while restricting the dimensions of the base 64 and the second seal plate 61 and controlling the press-fitting strokes to set the air gap A to a predetermined value, it is possible to increase the part cost. Therefore, it is not preferable because the assembly work is complicated and the cost is increased. It is desirable to provide a wheel bearing device with a rotational speed detection device with a high reliability and improved detection accuracy while reducing the cost with a simple configuration. It was.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a wheel bearing device with a rotational speed detection device with high reliability by improving the detection accuracy while reducing the size and cost. It is said.

  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 An annular sensor holder attached to the inner end, and a cross-section that is externally fitted to the inner ring A base made of a steel plate formed in an L shape, and a magnetic encoder that is integrally joined to the base and is configured so that characteristics in the circumferential direction change alternately and at equal intervals; A cylinder made of a steel plate fitting ring and a holding part in which the rotation speed sensor is embedded and resin-molded integrally with the fitting ring. The fitting ring is press-fitted into the outer periphery of the outer member. And a cylindrical portion that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, and a cylindrical portion that extends in the axial direction from the flange portion. An inner side seal is mounted between the cylindrical portion of the fitting ring and the inner ring, and includes an annular seal plate and a slinger formed in a substantially L-shaped cross section and arranged to face each other, With the seal across the holding part of the sensor holder In a wheel bearing device with a rotational speed detection device in which a pneumatic encoder is disposed and the magnetic encoder is opposed to the rotational speed sensor via an axial clearance, an axial clearance is provided between the base and the slinger. The slinger is positioned and fixed to the inner ring so as to be formed.

  Thus, a seal attached to the opening of the annular space formed between the outer member and the inner member, an annular sensor holder attached to the inner side end of the outer member, A steel plate base that is externally fitted to the inner ring and has a substantially L-shaped cross section; and a magnetic encoder that is integrally joined to the base so that characteristics in the circumferential direction change alternately and at equal intervals The sensor holder includes a fitting ring made of a steel plate and a holding part in which the rotation speed sensor is embedded integrally with the fitting ring and the rotation speed sensor is embedded. A cylindrical fitting portion press-fitted into the outer periphery, a flange portion extending radially inward from the fitting portion and in close contact with the end surface of the outer member, and a cylindrical portion extending in an axial direction from the flange portion The seal on the inner side of the seal is connected between the cylindrical part of the fitting ring and the inner ring. Each having an annular seal plate and a slinger that are formed in a substantially L-shaped cross section and are opposed to each other, and a seal and a magnetic encoder are disposed across the holding portion of the sensor holder. In a wheel bearing device with a rotational speed detection device that is opposed to the rotational speed sensor via an axial clearance, the slinger is positioned and fixed to the inner ring so that an axial clearance is formed between the base and the slinger. Therefore, during assembly, the slinger can be prevented from coming into contact with the base and moved, and the air gap between the magnetic encoder and the rotation speed sensor can be prevented from changing. Therefore, the air gap can be set to a predetermined value without strictly restricting the dimensions and press-fitting stroke of the base and slinger, and the detection accuracy is improved and the reliability is high while reducing the cost with a simple configuration. A wheel bearing device with a rotational speed detection device can be provided.

  Preferably, as in the invention described in claim 2, if a recess is formed on the inner periphery of the inner side end of the outer member, and the base is accommodated in the recess, the axial direction of the sensor holder Can be made compact.

  According to a third aspect of the present invention, the base is formed of a ferromagnetic steel plate, and the magnetic encoder is configured such that magnetic powder is mixed into the elastomer and the magnetic poles N and S are alternately arranged in the circumferential direction. If the rotary encoder is configured by magnetizing the magnetic field, the output signal becomes strong and stable detection accuracy can be ensured.

  According to a fourth aspect of the present invention, the seal plate is a core metal fitted into the cylindrical portion of the fitting ring, and a seal that is joined to the core metal and integrally includes a side lip and a radial. The slinger has a cylindrical portion that is externally fitted to the inner ring, and a standing plate portion that extends radially outward from the cylindrical portion, and the side lip is slidably contacted with the standing plate portion, If the radial lip is in sliding contact with the cylindrical part, foreign matter such as dust and magnetic powder enters from between the magnetic encoder and the detection part of the rotation speed sensor even during actual running, which is a harsh environment. Can be surely prevented.

  Further, as in the invention described in claim 5, an annular tongue piece projects from the front end portion of the standing plate portion in the axial direction, and the tongue piece and the cylindrical portion of the fitting ring have a slight radial clearance. If the labyrinth seal is configured to face each other, the sealing performance of the seal can be improved, and the reliability of detecting the rotational speed of the wheel can be improved.

  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 An annular sensor holder mounted on the part, and is fitted on the inner ring and has a substantially L-shaped cross section. A steel plate base and a magnetic encoder that is integrally joined to the base and is configured so that characteristics in the circumferential direction change alternately and at equal intervals, and the sensor holder is made of steel plate The fitting ring and a holding part in which the rotation speed sensor is embedded and resin-molded integrally with the fitting ring, and the fitting ring is a cylindrical fitting that is press-fitted into the outer periphery of the outer member. A joint portion, a flange portion extending radially inward from the fitting portion and closely contacting the end face of the outer member, and a cylindrical portion extending in the axial direction from the flange portion. The sensor holder includes an annular seal plate and a slinger that are respectively mounted between the cylindrical portion of the fitting ring and the inner ring, are formed in a substantially L-shaped cross section, and are arranged to face each other. The seal and the magnetic In the wheel bearing device with a rotational speed detection device in which a coder is disposed and the magnetic encoder is opposed to the rotational speed sensor via the axial clearance, an axial clearance is formed between the base and the slinger. As described above, since the slinger is positioned and fixed to the inner ring, it is possible to prevent the slinger from coming into contact with the base during assembly and to prevent the base from moving, and the air gap between the magnetic encoder and the rotation speed sensor changes. Can be prevented. Therefore, the air gap can be set to a predetermined value without strictly restricting the dimensions and press-fitting stroke of the base and slinger, and the detection accuracy is improved and the reliability is high while reducing the cost with a simple configuration. A wheel bearing device with a rotational speed detection device can be provided.

  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 An annular sensor holder mounted on the inner end of the inner ring, and an outer fitting to the inner ring, and a substantially L-shaped cross section And a magnetic encoder in which magnetic powder is mixed in the elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction. Is formed of a steel plate fitting ring and a resin molded integrally with the fitting ring and embedded with a rotation speed sensor, and the fitting ring is press-fitted into the outer periphery of the outer member. And a cylindrical fitting portion that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, and a cylindrical portion that extends in the axial direction from the flange portion, Among the seals, an inner seal is mounted between the cylindrical portion of the fitting ring and the inner ring, and an annular seal plate and a slinger, which are formed in a substantially L-shaped cross section and are arranged to face each other, Provided with the seal across the holding part of the sensor holder In the wheel bearing device with a rotational speed detection device in which a pneumatic encoder is disposed and the magnetic encoder is opposed to the rotational speed sensor via an axial clearance, an inner end of the outer member is disposed on the inner periphery of the outer member. A recess is formed, and the base is accommodated in the recess, and the slinger is positioned and fixed to the inner ring so that an axial clearance is formed between the base and the slinger.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a modification of FIG. It is a principal part enlarged view. 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 for a drive wheel and has a so-called third generation configuration in which the hub wheel 1 and the double row rolling bearing 2 are unitized.
The double-row rolling bearing 2 includes an outer member 4, an inner member 3, and double-row rolling elements (balls) 5 and 5. The outer member 4 has a vehicle body mounting flange 4b integrally attached to a knuckle (not shown) on the outer periphery, and double row outer rolling surfaces 4a, 4a are formed on the inner periphery. This outer member 4 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 4a and 4a have a surface hardness in the range of 58 to 64HRC by induction hardening. A hardened layer is formed.

On the other hand, the inner member 3 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 attaching a wheel (not shown) to an end portion on the outer side, and hub bolts 7 a are implanted at circumferentially equidistant positions of the wheel mounting flange 7. Yes. Further, on the outer periphery, there are an inner rolling surface 1a opposed to one (outer side) of the double row outer rolling surfaces 4a, 4a, and a cylindrical small-diameter step portion 1b extending in an axial direction from the inner rolling surface 1a. A serration (or spline) 1c for torque transmission is formed on the inner periphery. The inner ring 6 is press-fitted and fixed to the small-diameter step portion 1b of the hub wheel 1, and an inner rolling surface 6a facing the other (inner side) of the outer rolling surfaces 4a, 4a of the double row is formed on the outer periphery thereof. Yes.

  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 has a small diameter step portion from a seal land portion 7b in which an outer side seal 9 to be described later comes into sliding contact with the inner rolling surface 1a. A hardened layer is formed in the range of 58 to 64 HRC by induction hardening over 1b. As a result, the seal land portion 7b serving as the base portion of the wheel mounting flange 7 has not only improved wear resistance but also sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 7, and the hub. The fretting resistance and durability of the wheel 1 are improved.

  Double row rolling elements 5 and 5 are accommodated between the outer rolling surfaces 4a and 4a of the outer member 4 and the double row inner rolling surfaces 1a and 6a facing the outer rolling surfaces 4a and 4a, respectively. It is held freely rolling. Further, seals 9 and 10 are attached to the end portion of the outer member 4 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like into the bearing from the outside. The outer-side seal 9 is constituted by an integral seal having a plurality of seal lips (here, three) which are in sliding contact with the seal land portion 7b of the hub wheel 1, and an inner-side seal 10 described later is an annular seal. The seal plate 16 and the slinger 17 are composed of a composite type seal, that is, a so-called high pack seal.

  In the present embodiment, as shown in an enlarged view in FIG. 2, the sensor holder 11 formed in an annular shape is attached to the inner side end of the outer member 4. The sensor holder 11 includes a fitting ring 12 and a holding portion 13 coupled to the fitting ring 12. The fitting ring 12 includes a cylindrical fitting portion 12a that is press-fitted into the outer periphery of the outer member 4, a flange portion 12b that extends radially inward from the fitting portion 12a, and an axial direction from the flange portion 12b. The cylindrical portion 12c extends, and the whole is formed in an annular shape. The fitting ring 12 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). Yes. Then, the perforations 14 are formed in the circumferential direction of the cylindrical portion 12c, the holding portion 13 is integrally molded with synthetic resin, and the sensor holder 11 is in a state where the flange portion 12b is in close contact with the end surface of the outer member 4. It is press-fitted and fixed to the end of the outer member 4.

  Here, the holding portion 13 is formed of a nonmagnetic resin material such as polyphenylene sulfide (PPS), and includes a rotational speed sensor 15 that faces a magnetic encoder 22 described later via a predetermined axial gap (air gap). Buried. This rotational speed sensor 15 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics in accordance with the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of this magnetic detecting element. IC. Thereby, it is possible to detect the rotational speed with high reliability at low cost. In addition, the holding part 13 can illustrate injection-moldable synthetic resins such as PA (polyamide) 66 and polybutylene terephthalate (PBT) in addition to the materials described above.

  The inner-side seal 10 is attached to an opening of an annular space formed between the cylindrical portion 12c of the fitting ring 12 and the inner ring 6, and an annular seal plate 16 and a slinger formed in a substantially L-shaped cross section. 17. The seal plate 16 includes a cored bar 18 that is fitted into the cylindrical portion 12 c of the fitting ring 12, and a seal member 19 that is integrally vulcanized and bonded to the cored bar 18.

  The core 18 has a substantially L-shaped cross-section by pressing an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). Is formed. Further, the seal member 19 integrally includes a side lip 19a, a grease lip 19b, and an intermediate lip 19c, and is made of an elastomer such as synthetic rubber.

  On the other hand, the slinger 17 protrudes in the axial direction from a cylindrical portion 17a fitted on the inner ring 6, a standing plate portion 17b extending radially outward from the cylindrical portion 17a, and a tip portion of the standing plate portion 17b. And an annular tongue piece 17c. The tongue piece 17c is opposed to the cylindrical portion 12c of the fitting ring 12 through a slight radial clearance to form a labyrinth seal 20. The slinger 17 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). Here, the side lip 19 a is in sliding contact with the standing plate portion 17 b of the slinger 17, and the grease lip 19 b and the intermediate lip 19 c are in sliding contact with the cylindrical portion 17 a of the slinger 17.

  A base 21 having a magnetic encoder 22 is disposed on the opposite side (outer side) of the seal 10 across the holding portion 13 of the sensor holder 11. The base 21 includes a cylindrical portion 21a that is externally fitted to the inner ring 6 and a standing plate portion 21b that extends radially outward from the cylindrical portion 21a, and has a substantially L-shaped cross section. A magnetic encoder 22 in which a magnetic powder such as ferrite is mixed with an elastomer such as rubber is integrally vulcanized and bonded to the inner side surface of the standing plate portion 21b. The magnetic encoder 22 is magnetized with magnetic poles N and S alternately in the circumferential direction, and constitutes a rotary encoder for detecting wheel rotation speed. Thereby, combined with the ferromagnetic base 21, the output signal becomes strong, and stable detection accuracy can be ensured.

  Thus, in this embodiment, the rotational speed sensor 15 is disposed in the annular sensor holder 11, the seal 10 is disposed on the inner side of the rotational speed sensor 15, and the inner side of the seal 10 is disposed on the inner side of the seal 10. Since the labyrinth seal 20 is configured, even in a state before the constant velocity universal joint (not shown) is coupled to the wheel bearing device, including during transportation to the assembly line of the automobile finished product manufacturer, Even during actual running, which is a difficult environment, foreign matters such as dust and magnetic powder can be reliably prevented from entering between the magnetic encoder 22 and the detection unit of the rotation speed sensor 15 from the outside. Therefore, the reliability of wheel rotation speed detection can be improved. Further, the radial direction can be reduced, and the surroundings of the rotation speed sensor 15 and the like can be simplified, and the assembly workability is improved.

  Here, in the present embodiment, after the base 21 to which the magnetic encoder 22 is joined is preliminarily fitted onto the inner ring 6 and fixed at a predetermined position, the sensor holder 11 is attached to the outer member 4 and finally A seal 10 is attached to the. At this time, the slinger 17 is positioned and fixed to the inner ring 6 so that a predetermined axial clearance δ is formed between the cylindrical portion 17a of the slinger 17 constituting the seal 10 and the cylindrical portion 21a of the base 21. Thereby, it can prevent that the cylindrical part 17a of the slinger 17 contact | abuts to the cylindrical part 21a of the base 21, and the base 21 moves, and prevents that the air gap A of the magnetic encoder 22 and the rotational speed sensor 15 changes. be able to. Therefore, the air gap A can be set to a predetermined value without strictly regulating the dimensions and press-fitting strokes of the base 21 and the slinger 17, and the detection accuracy is improved and the reliability is improved while reducing the cost with a simple configuration. It is possible to provide a wheel bearing device with a highly reliable rotational speed detection device.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 22 and the rotational speed sensor 15 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.

  FIG. 3 shows a modification of the above-described rotation speed detection device (FIG. 2). In addition, the same code | symbol is attached | subjected to the site | part, the same components, or site | part which has the same function as embodiment mentioned above, and the detailed description is abbreviate | omitted.

  An annular sensor holder 23 is attached to the inner end of the outer member 24. The sensor holder 23 includes a fitting ring 25 and a holding portion 26 coupled to the fitting ring 25. The fitting ring 25 includes a cylindrical fitting portion 12a that is press-fitted into the outer periphery of the outer member 24, a flange portion 12b that extends radially inward from the fitting portion 12a, and an axial direction from the flange portion 12b. It consists of a cylindrical part 25a that extends, and is entirely formed in an annular shape. The fitting ring 25 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). Yes. And the perforation 14 is formed in the circumferential direction of the cylindrical part 25a, and the holding | maintenance part 26 is integrally molded by the synthetic resin.

  The inner-side seal 27 is attached to an opening in an annular space formed between the cylindrical portion 25a of the fitting ring 25 and the inner ring 6, and the annular seal plate 16 and slinger formed in a substantially L-shaped cross section. 28. The slinger 28 has a cylindrical portion 28a that is externally fitted to the inner ring 6, and a standing plate portion 28b that extends radially outward from the cylindrical portion 28a. A labyrinth seal 29 is constituted by the outer edge of the upright plate portion 28b facing the cored bar 18 of the seal plate 16 through a slight radial clearance. The slinger 28 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).

  In this embodiment, the base 21 to which the magnetic encoder 22 is joined is preliminarily fitted to the inner ring 6 and fixed at a predetermined position, and the sensor holder 23 is attached to the outer member 24, as in the above-described embodiment. After that, the seal 27 is finally attached. At this time, the slinger 28 is positioned and fixed to the inner ring 6 so that a predetermined axial clearance δ is formed between the cylindrical portion 28a of the slinger 28 constituting the seal 27 and the cylindrical portion 21a of the base 21.

  Here, a recess 30 is formed on the inner periphery of the inner side end of the outer member 24, and the base 21 is accommodated in the recess 30 beyond the end surface of the outer member 24. As a result, the sensor holder 23 can be made more compact in the axial direction while ensuring the sealing performance of the seal 27.

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

  The wheel bearing device with a rotation speed detection device according to the present invention can be applied to a wheel bearing device in which any type of rotation speed detection device is incorporated in the inner ring rotation structure.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view same as the above. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 ... hub wheel 1a, 6a ... inner rolling surface 1b ... ·············· Small diameter step 1c ················· Double row rolling bearing 3・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 4b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Body mounting flange 5 ... Rolling element 6 ... .... Inner ring 7 ..... Wheel mounting flange 7a ... Bolt 7b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal land 8 ・ ・ ・ ・ ・ ・ ・ ・ Retainer 9 ・ ・... Outboard side seals 10, 27 ... Inboard side seals 11,23・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 12, 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting ring 12a ・ ・ ・ ・ ・ ・······················································································· Cylindrical portions 13, 26 ... holding part 14 ... perforation 15 ... ... rotational speed sensor 16 ... ··································································································································・ ・ ・ ・ ・ ・ ・ ・ Tangular piece 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 19a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 19b ・ ・ ・ ・ ・ ・ ・ ・ Gree Slip 19c ... Intermediate lip 20, 29 ... Labyrinth seal 21 ... ... base 22 ... magnetic encoder 30 ...・ ...... Recess 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Outside member 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 53 53a ... fitting part 53b ... collar part 53c ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Perforation 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotation Speed sensor 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 60・ ・ ・ ・ ・ ・ ・ ・ ・ First seal plate 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Second seal 61a, 64a ···················································. ... tongue piece 62 ... core metal 63 ... ..Seal member 63a ... Side lip 63b ... Grease lip 63c ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Labyrinth seal A ... Air gap δ ... .... Axial clearance

Claims (5)

An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed so as to be freely rollable between both rolling surfaces of the inner member and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
An annular sensor holder attached to the inner side end of the outer member;
A base made of steel plate that is externally fitted to the inner ring and has a substantially L-shaped cross section;
A magnetic encoder that is integrally joined to the base and is configured such that characteristics in the circumferential direction change alternately and at equal intervals;
The sensor holder is composed of a steel plate fitting ring and a holding part in which the rotation speed sensor is embedded and resin-molded integrally with the fitting ring, and the fitting ring is an outer periphery of the outer member. A cylindrical fitting portion that is press-fitted into the cylindrical portion, a flange portion that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, and a cylindrical portion that extends in an axial direction from the flange portion. As
Among the seals, an inner seal is mounted between the cylindrical portion of the fitting ring and the inner ring, and an annular seal plate and a slinger, which are formed in a substantially L-shaped cross section and are arranged to face each other, Prepared,
The seal and the magnetic encoder are disposed across the holding portion of the sensor holder,
In the wheel bearing device with a rotational speed detection device in which the magnetic encoder is opposed to the rotational speed sensor via an axial clearance,
A wheel bearing device with a rotational speed detecting device, wherein the slinger is positioned and fixed to the inner ring so that an axial clearance is formed between the base and the slinger.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein a recess is formed in an inner periphery of an inner side end of the outer member, and the base is accommodated in the recess.   The base is formed of a ferromagnetic steel plate, and the magnetic encoder is configured such that a magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction to constitute a rotary encoder. Item 3. A wheel bearing device with a rotational speed detection device according to Item 1 or 2.   The seal plate is composed of a core metal fitted in the cylindrical portion of the fitting ring, a seal member joined to the core metal and integrally having a side lip and a radial, and the slinger is externally attached to the inner ring. A cylindrical portion to be fitted and a standing plate portion extending radially outward from the cylindrical portion. The side lip is slidably contacted with the standing plate portion, and the radial lip is slidably contacted with the cylindrical portion. The wheel bearing apparatus with a rotational speed detection apparatus in any one of Claims 1 thru | or 3.   An annular tongue piece protrudes from the tip of the upright plate portion in the axial direction, and this tongue piece faces the cylindrical portion of the fitting ring via a slight radial clearance to form a labyrinth seal. The wheel bearing apparatus with a rotational speed detection apparatus of Claim 4.

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