JP5334699B2 - Wheel bearing device with rotation speed detector - Google Patents

Description

  The present invention includes a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and in particular, a rotation speed detection device for detecting the rotation speed of the wheel is built in. The present invention relates to a wheel bearing device with a rotation speed detection device that improves the detection accuracy and improves the detection accuracy.

  A rotational speed detection device comprising an encoder whose magnetic characteristics change in the circumferential direction and a rotational speed sensor that detects the rotational speed of a wheel and controls an anti-lock brake system (ABS) of the vehicle as the encoder rotates. In order to eliminate the complexity of adjusting the air gap with the encoder and to make it more compact, recently, a device in which a rotation speed sensor is built in a bearing has been proposed.

  A structure as shown in FIG. 10 is known as an example of such a wheel bearing device with a rotational speed detection device. This wheel bearing device with a rotational speed detection device is supported and fixed to a knuckle (not shown), and is inserted into the outer member 51 serving as a fixing member and the outer member 51 via double rows of balls 53 and 53. And an inner member 52. The inner member 52 includes a hub ring 55 and an inner ring 56 that is externally fitted to the hub ring 55.

  The outer member 51 integrally has a vehicle body mounting flange 51b on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. On the other hand, the inner member 52 is formed with double-row inner rolling surfaces 55a and 56a facing the outer rolling surfaces 51a and 51a of the outer member 51 described above. Of the double row inner rolling surfaces 55 a and 56 a, one inner rolling surface 55 a is integrally formed on the outer periphery of the hub wheel 55, and the other inner rolling surface 56 a is formed on the outer periphery of the inner ring 56. The inner ring 56 is press-fitted into a shaft-shaped small-diameter step portion 55 b that extends in the axial direction from the inner rolling surface 55 a of the hub wheel 55. The double-row balls 53 and 53 are respectively accommodated between the rolling surfaces and are held by the cages 57 and 57 so as to be freely rollable.

  The hub wheel 55 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) on the outer periphery, and a crimped portion 58 is formed by plastically deforming the end portion of the small diameter step portion 55b radially outward. The inner ring 56 is fixed in the axial direction by the caulking portion 58. A seal 59 and a cover 60 are attached to the end of the outer member 51 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside. .

  An encoder 61 is press-fitted into the outer diameter of the inner ring 56. The encoder 61 is formed in a circular shape by applying plastic working to a magnetic metal plate such as a mild steel plate, and has a cylindrical mounting portion 61a that is press-fitted into the outer diameter of the inner ring 56, and one end of the mounting portion 61a. And an encoder main body 61b attached to the collar portion. The encoder body 61b is formed, for example, by forming a permanent magnet such as a rubber magnet in an annular shape so that the magnetic poles N and S appear alternately in the circumferential direction, and magnetic field fluctuations are generated by rotation in the circumferential direction. ing.

  The cover 60 is formed in a bottomed cylindrical shape formed by injection molding of a synthetic resin, and the cylindrical portion 60a is fitted and fixed to the inner opening end of the outer member 51, and the outer member 51 is covered by the lid portion 60b. The opening is closed. As shown in FIG. 11, the cover 60 is provided with a cylindrical sensor mounting portion 62 on the lid portion 60b, and an insertion portion 64a of the sensor 64 is inserted into a sensor mounting hole 63 formed on the inner peripheral side thereof. Yes. A partition wall 66 having a thickness of 0.3 to 0.5 mm is provided on the inner side of the sensor mounting hole 63 to partition the sensor mounting hole 63 and the device internal space 65. This partition wall 66 is injection-molded integrally with the cover 60, and since the synthetic resin of the material is non-magnetic, it does not affect the rotational speed detection accuracy.

  The sensor 64 is made of a synthetic resin, and is attached to the cover 60 by inserting the sensor insertion portion 64 a into the sensor attachment hole 63 of the cover 60. The sensor insertion portion 64a is opposed to a part of the encoder main body 61b with a predetermined interval across the partition wall 66 on the back side of the sensor mounting hole 63, and in the vicinity of the surface facing the encoder main body 61b, the encoder 61 A detection unit (not shown) for detecting magnetic field fluctuations generated by the rotation of is incorporated.

  According to such a conventional wheel bearing device with a rotational speed detection device, the partition wall 66 that partitions the sensor mounting hole 63 and the device internal space 65 is provided on the inner side of the sensor mounting hole 63 of the cover 60. Therefore, compared with the conventional apparatus, the sensor mounting hole 63 does not penetrate the cover 60, and therefore, there is less foreign material intrusion path inside the apparatus, and the sealing performance of the entire apparatus is excellent. Further, since the partition wall 66 is integrally formed with the cover 60, the structure is simple and the labor for assembly can be reduced.

JP 2004-354066 A

  In such a conventional wheel bearing device with a rotational speed detection device, since the sensor mounting hole 63 of the cover 60 is provided with a partition wall 66 that partitions the sensor mounting hole 63 and the device internal space 65 on the back side, There are few foreign substance intrusion routes inside the device, and the sealing performance of the entire device is excellent. However, it is generally known that the detection accuracy is improved when the air gap between the encoder and the sensor is smaller, and the detection accuracy is significantly lowered when the air gap exceeds 2 mm. Therefore, when the processing accuracy of each part is anticipated, it is necessary to set the thickness of the partition wall 66 thin.

  In the rotational speed detection device described above, the thickness of the partition wall 66 is set to 0.3 to 0.5 mm. However, in the cover 60 made of synthetic resin reinforced with glass fiber or the like, the partition wall 66 is set to 0.00 mm. It is difficult to integrally mold with a thickness of 7 to 1.5 mm or less, and with such a thickness, there is a problem that an air gap becomes too large to obtain a necessary magnetic flux density.

  The present invention has been made in view of such a conventional problem, and provides a wheel bearing device with a rotational speed detection device that improves the sealing performance of the detection unit and improves the detection accuracy of the sensor. Objective.

In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and a double row outer rolling surface on the inner periphery. A hub wheel integrally formed with a formed outer member and a wheel mounting flange for mounting a wheel at one end, and having a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub ring An inner member comprising at least one inner ring that is press-fitted and having a double-row inner rolling surface that is opposed to the outer rolling surface of the double-row on the outer periphery, and both the inner member and the outer member. A double-row rolling element accommodated between the rolling surfaces via a cage, and a pulsar ring that is externally fitted to the inner ring and whose magnetic characteristics change alternately and at equal intervals in the circumferential direction; The inner side of the outer member is attached to the inner side end of the outer member. A cover made of synthetic resin that closes the opening, and a rotation speed sensor that is mounted on a mounting portion formed on a radially outer portion of the cover and faces the pulsar ring via a predetermined air gap. In the wheel bearing device with a rotational speed detection device, an insertion hole is formed in the mounting portion of the cover, and the rotational speed sensor is attached to the insertion hole, and the cover is separated from the cover on the back side of the insertion hole. A partition member made of a non-magnetic steel plate is fixed, and the partition member includes a cylindrical portion along the insertion hole, a bottom portion closing the opening on the back side of the insertion hole, and an end portion of the cylindrical portion. And a flange having a flange protruding radially outward, at least the flange is integrally molded in the insertion hole, and the plate thickness is set in a range of 0.1 to 0.5 mm. The rotational speed through the partition member Capacitors and the pulser ring are facing.

In this way, the pulsar ring that is externally fitted to the inner ring and whose magnetic characteristics change alternately and at equal intervals in the circumferential direction, is mounted on the inner side end of the outer member, and the inner side opening of the outer member A synthetic resin bottomed cylindrical cover that closes the part, and a rotational speed sensor that is attached to a mounting part formed on the outer side in the radial direction of the cover and faces the pulsar ring via a predetermined air gap. In the second-generation or third-generation wheel bearing device with a rotation speed detection device provided with an insertion hole, an insertion hole is formed in the mounting portion of the cover, and a rotation speed sensor is attached to the insertion hole. A partition member made of a non-magnetic steel plate that is separate from the cover is fixed to the back side , and this partition member includes a cylindrical portion along the insertion hole, and a bottom portion that closes the opening on the back side of the insertion hole, Projects radially outward at the end of the cylinder Is formed in a cup shape having a flange portion, at least the flange portion is integrally molded into the insertion hole, and the rotational speed sensor via the partition member thickness is set in a range of 0.1~0.5mm Since the pulsar ring is opposed, it is possible to provide a wheel bearing device with a rotation speed detection device that improves the sealing performance of the detection unit and improves the detection accuracy of the rotation speed sensor.

Moreover, if the partition member is formed in a stepped shape having two cylindrical portions as in the invention described in claim 2 , the strength and rigidity of the partition member is further increased, and the attachment portion is also provided. It can be firmly fixed.

Further, as in the invention described in claim 3 , if the partition member is integrally molded so as to protrude to the back side of the insertion hole so that a part of the cylindrical portion is exposed, the outer diameter of the cylindrical portion The mold can be molded with the part supported by the mold, the positioning accuracy of the partition member is improved, and the shape and dimensions of the pulsar ring are not restricted and the degree of freedom in design is increased.

According to a fourth aspect of the present invention, the partition member is integrally molded so as to be exposed in the insertion hole, and the depth of the partition member is 70 to 90% of the tip length of the rotation speed sensor. If it is set to be within the range, the contact area with the synthetic resin of the mounting portion increases and the fixing force increases, and the contact area with the rotation speed sensor increases, and the sealing performance can be improved. .

Further, as in the invention described in claim 5 , if the partition member is integrally joined to the opening on the back side of the insertion hole by ultrasonic welding, the sealing performance can be improved, The number of processing steps for the partition member can be significantly reduced, and the cost can be reduced.

Further, if the partition member is formed from austenitic stainless steel plate by press working as in the invention described in claim 6, it does not adversely affect the sensing performance of the rotational speed sensor, and the strength / rigidity of the partition member. Can be increased.

According to a seventh aspect of the present invention, the cover includes a bottomed cylindrical cover body and a core bar integrally molded in the opening of the cover body. If the cross section is formed into an approximately L-shaped annular shape by pressing from a stainless steel plate, it will not adversely affect the sensing performance of the rotational speed sensor, the cover will have increased strength and rigidity, and the pull-out resistance will be improved. The tightness of the joint is improved.

Further, as in the invention described in claim 8 , if the rotation speed sensor is fixed to the mounting portion by a fixing bolt via an eyebrow-shaped mounting member, the rotation speed sensor is It is possible to prevent the fixing bolt from shifting in the rotation direction with the fulcrum as a fulcrum, and to prevent the rotation speed sensor from being eccentric with respect to the insertion hole.

Further, as in the invention according to claim 9 , if the rotational speed sensor is press-fitted and fixed in the insertion hole, the rotational speed sensor can be mounted with one touch utilizing the elasticity of the synthetic resin. Workability can be improved and cost reduction can be achieved.

According to a tenth aspect of the present invention, the pulsar ring is integrally joined to a support ring formed from a ferromagnetic steel plate by press working into a ring shape and a side surface of the support ring by vulcanization adhesion. If the magnetic material powder is mixed in the elastomer, and the magnetic encoder is composed of magnetic poles N and S alternately arranged in the circumferential direction, the magnetic output of the magnetic encoder becomes stronger and stable detection accuracy is obtained. Can be secured.

Further, as in the invention described in claim 11 , if a seal is attached to the opening of the annular space formed between the inner end of the outer member and the inner ring, the inside of the bearing Since the sealed grease is sealed by this seal and the grease does not flow out into the cover, the amount of grease filled can be minimized, and weight reduction and cost reduction can be achieved.

The wheel bearing device with a rotational speed detection device according to the present invention has an outer body integrally provided with a vehicle body mounting flange for being attached to a knuckle 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 accommodated in a rollable manner via a cage; a pulsar ring that is externally fitted to the inner ring and has magnetic properties alternately and equally spaced in the circumferential direction; and an inner member of the outer member The opening on the inner side of the outer member is attached to the end on the side Rotational speed detection provided with a cover made of synthetic resin to be closed, and a rotational speed sensor mounted on a mounting portion formed on the radially outer portion of the cover and opposed to the pulsar ring via a predetermined air gap In the wheel bearing device with a device, an insertion hole is formed in the mounting portion of the cover, and the rotational speed sensor is attached to the insertion hole, and the non-magnetic member separate from the cover is disposed on the back side of the insertion hole. A partition member made of a steel plate of the body is fixed, and the partition member has a cylindrical portion along the insertion hole, a bottom portion that closes an opening on the back side of the insertion hole, and a radial direction at an end portion of the cylindrical portion. The partition member is formed in a cup shape having a flange portion protruding outward, at least the flange portion is integrally molded in the insertion hole, and the plate thickness is set in a range of 0.1 to 0.5 mm. Via the rotational speed sensor Since Rusaringu is facing can be provided with improved sealing of the detection portion, a rotational speed detector equipped wheel support bearing assembly with improved detection accuracy of the rotational speed sensor.

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. (A) is sectional drawing which shows the cover of FIG. (B) is a side view of (a). It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows another modification same as the above. It is a principal part enlarged view which shows another modification same as the above. It is a principal part enlarged view which shows another modification same as the above. It is a principal part enlarged view which shows another modification same as the above. 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.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount 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 formed of an inner ring that is press-fitted into a small-diameter step portion and has an inner rolling surface that is opposed to the other outer rolling surface of the double row on the outer periphery, and each of the inner member and the outer member. A double row rolling element accommodated between the rolling surfaces, a pulsar ring that is externally fitted to the inner ring, and whose magnetic characteristics change alternately and at equal intervals in the circumferential direction, and the outer member It is attached to the inner side end and closes the inner side opening of the outer member. A rotation speed sensor mounted on a mounting portion formed on a radially outer portion of the cover and facing the pulsar ring via a predetermined air gap. In the bearing device for the present invention, an insertion hole is formed in the mounting portion of the cover, the rotational speed sensor is mounted in the insertion hole, and a partition member is integrally molded on the back side of the insertion hole. The austenitic stainless steel plate having a plate thickness of 0.1 to 0.5 mm is formed into a cup shape by pressing, and the rotational speed sensor and the pulsar ring are opposed to each other through the partition member.

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 (a) is a sectional view showing a cover of FIG. 1, and FIG. 3 is an enlarged view of the main part of FIG. 1, FIG. 4 is an enlarged view of the main part showing a modification of FIG. 3, and FIG. 5 is an enlarged view of the main part showing a modification of FIG. 6-9 is the principal part enlarged view which shows another modification as same as the above. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device with a rotational speed detection device is called the third generation on the driven wheel side, and the hub wheel 1 and the double row rolling bearing 2 are configured as a unit. The double row rolling bearing 2 includes an inner member 3, an outer member 4, and double row rolling elements (balls) 5, 5 accommodated between the members 3, 4 so as to be freely rollable. The inner member 3 indicates a hub wheel 1 and an inner ring 7 that is press-fitted and fixed to the hub wheel 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, one (outer side) inner rolling surface 1a on the outer periphery, and this inner rolling. An axial small-diameter step portion 1b extending in the axial direction from the surface 1a is formed. Further, hub bolts 6 a for fastening the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 6.

  The inner ring 7 is formed with the other (inner side) inner rolling surface 7a on the outer periphery, and is press-fitted into the small-diameter step portion 1b of the hub ring 1 through a predetermined squeeze. Then, the end portion of the small-diameter step portion 1b is plastically deformed radially outward to form a caulking portion 1c, and the inner ring 7 is given a predetermined bearing preload to the hub wheel 1 by the caulking portion 1c. It is fixed in the axial direction in the state.

  The hub wheel 1 is formed of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 that becomes a seal land portion of a seal 9 described later. The surface hardness of the base portion 6b from the base portion 6b to the small-diameter step portion 1b is hardened by induction hardening in a range of 58 to 64 HRC. The caulking portion 1c is an unquenched portion having a surface hardness of 25HRC or less after forging. The inner ring 7 and the rolling element 5 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core portion by quenching.

  On the other hand, the outer member 4 integrally has a vehicle body mounting flange 4b to be fixed to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner side of the double row of the inner members 3 on the inner periphery. Double row outer rolling surfaces 4a, 4a facing the rolling surfaces 1a, 7a are integrally formed. The outer member 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer raceway surfaces 4a and 4a have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range. The rolling elements 5 and 5 are accommodated between the rolling surfaces 4a, 1a and 4a and 7a, and the double-row rolling elements 5 and 5 are held by the cages 8 and 8 so as to roll freely.

  In addition, seals 9 and 10 are attached to the opening of the annular space formed between the outer member 4 and the inner member 3, and leakage of the lubricating grease sealed inside the bearing to the outside and from the outside Rain water and dust are prevented from entering the bearing. Furthermore, the cover 11 is attached to the opening end on the inner side of the outer member 4, the opening on the inner side of the outer member 4 is blocked, and rainwater, dust and the like are prevented from entering the detection unit from the outside. ing. Basically, the seal 10 is not necessary because it is closed by the cover 11, but here, since the seal 10 is attached to the inner side end of the outer member 4, the grease sealed inside the bearing Is sealed with this seal 10. That is, since the grease does not flow out into the cover 11, the amount of grease filled can be minimized, and the weight and cost can be reduced.

  In the present embodiment, the double-row angular contact ball bearing having the rolling elements 5 and 5 as balls is illustrated as the double-row rolling bearing 2, but not limited to this, the double-row tapered roller using a tapered roller as the rolling element. It may be a bearing. Further, although the third generation structure is illustrated, the present invention is not limited to this, and although not shown, a so-called second generation structure in which a pair of inner rings are press-fitted into the hub ring in a small diameter step portion of the hub ring may be used.

  In the present embodiment, the pulsar ring 12 is press-fitted into the outer diameter of the inner ring 7. The pulsar ring 12 includes a support ring 13 formed in an annular shape, and a magnetic encoder 14 that is integrally joined to a side surface of the support ring 13 by vulcanization adhesion or the like. This magnetic encoder 14 is a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and magnetizing the magnetic poles N and S alternately in the circumferential direction. Yes.

  The support ring 13 is pressed from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). It has a cylindrical fitting portion 13a that is formed into a substantially L-shaped cross section by processing and is press-fitted into the inner ring 7, and a standing plate portion 13b that extends radially inward from the fitting portion 13a. The magnetic encoder 14 is joined to the inner side surface of the upright plate portion 13b.

  The cover 11 is fitted and fixed to the opening end of the outer member 4 on the inner side, and closes the opening of the outer member 4. As shown in FIG. 2, the cover 11 includes a bottomed cylindrical cover body 15 made of synthetic resin and a cored bar 16 integrally molded in the opening of the cover body 15. The cover 15 made of synthetic resin may be directly attached to the outer member 4, but the strength and rigidity of the cover 11 are increased by the cored bar 16, so that the removal resistance is increased and the airtightness of the fitting portion is increased. improves.

  The cover body 15 is formed by injection molding from a non-magnetic special ether-based synthetic resin material such as polyphenylene sulfide (PPS), and a reinforcing material such as GF (glass fiber) is added in an amount of 30 to 50 wt%. As a result, the sensing performance of the rotation speed sensor 19 is not adversely affected, the corrosion resistance is excellent, the strength and rigidity are increased, and the durability can be improved over a long period of time. The cover main body 15 can be exemplified by injection-moldable synthetic resins such as PA (polyamide) 66, PA6.12, PPA (polyphthalamide), PBT (polybutylene terephthalate), etc., in addition to the materials described above. Moreover, as a fibrous reinforcement, not only GF but CF (carbon fiber), an aramid fiber, a boron fiber, etc. can be illustrated other than this.

  The cored bar 16 is formed in an annular shape having an L-shaped cross section by press forming a stainless steel plate having corrosion resistance. In particular, the metal core 16 is formed of a non-magnetic steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304, etc.) so as not to adversely affect the sensing performance of the rotational speed sensor 19 described later. It is preferable.

  A mounting portion 17 that protrudes in the axial direction is integrally formed on the radially outer portion of the cover body 15, and a sensor unit 18 is mounted in an insertion hole 17 a formed in the mounting portion 17. The sensor unit 18 includes a rotation speed sensor 19 composed of a magnetic detection element that changes characteristics according to the flow direction of magnetic flux, such as a Hall element, a magnetoresistive element (MR element), and a waveform shaping that adjusts the output waveform of the magnetic detection element It is composed of an IC or the like in which a circuit is incorporated, and constitutes an automobile ABS that detects the rotational speed of a wheel and controls its rotational speed.

  Here, since the sensor unit 18 is fixed to the mounting portion 17 by the fixing bolt 21 via the eyebrow-shaped mounting member 20, the rotational speed sensor 19 rotates around the fixing bolt 21 as a fulcrum when the fixing bolt 21 is fastened. It is possible to prevent deviation in the direction, and it is possible to prevent the rotation speed sensor 19 from being eccentric with respect to the insertion hole 17a. The fixing method is not limited to such a method. For example, although not shown, a so-called clip-on type in which the sensor unit is press-fitted and fixed in the insertion hole by utilizing the elasticity of the synthetic resin may be used. As a result, the rotation speed sensor can be mounted with a single touch, the assembling workability can be improved, and the cost can be reduced.

  Here, in this embodiment, as shown in an enlarged view in FIG. 3, an insertion hole 17 a for a rotational speed sensor (not shown) is formed in the attachment portion 17 of the cover body 15. The insertion hole 17 a is formed at a position corresponding to the magnetic encoder 14, and a partition member 22 is integrally molded with the cover body 15 on the back side. The partition member 22 is formed into a cup shape by press working from a non-magnetic steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 type or the like), and the magnetic encoder 14 has a slight axial gap therebetween. It is confronted. By this partition member 22, while improving the sealing performance of a detection part, the bearing apparatus for wheels with a rotational speed detection apparatus which improved the detection accuracy of the rotational speed sensor can be provided.

  The material of the partition member 22 is not limited to a non-magnetic steel plate, and may be made of an aluminum alloy or a synthetic resin. In particular, a material obtained by adding 10 to 50 wt% of a fibrous reinforcing material such as GF to a thermoplastic synthetic resin such as PA66 or PA6 / 12 is preferable. By adopting such a material, it can be formed into a desired shape by injection molding, has better compatibility with the cover body 15 made of synthetic resin than the steel plate, and can increase the fixing force of the partition member 22. .

  Further, the plate thickness t of the partition member 22 is set in a range of 0.1 to 0.5 mm. If the plate thickness t is less than 0.1 mm, the strength and rigidity are insufficient, and there is a risk of deformation or breakage due to collision with other parts during assembly. On the other hand, if the plate thickness t exceeds 0.5 mm, the air gap becomes too large to obtain the required magnetic flux density.

  Here, the active type rotational speed detection device including the magnetic encoder 14 and the rotational speed sensor 19 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection device according to the present invention is not limited thereto. Instead, for example, a passive type composed of a magnetic encoder, a magnet, and an annular coil wound around the magnet may be used.

  Next, modified examples of the partition member 22 will be described with reference to FIGS. 4 to 9. In addition, the same code | symbol is attached | subjected to the component and site | part which has the same component same part as embodiment mentioned above, or the same function, and detailed description is abbreviate | omitted.

  The partition member 23 shown in FIG. 4 includes a cylindrical portion 23a along the insertion hole 17a and a bottom portion 23b that closes the opening on the back side of the insertion hole 17a, and is formed into a cup shape by pressing from an austenitic stainless steel plate. It is formed and integrally molded on the back side of the insertion hole 17a. The cylindrical portion 23a of the partition member 23 is set longer than the partition member 22 described above. As a result, the fixing force of the partition member 23 can be prevented from increasing and falling off for a long period of time, and the strength and rigidity of the partition member 23 itself can be increased, which can cause deformation or damage by colliding with other parts during assembly. Can be prevented.

  The partition member 24 shown in FIG. 5 is formed into a cup shape by pressing from an austenitic stainless steel plate, and is integrally molded on the back side of the insertion hole 17a. The partition member 24 includes a cylindrical portion 23a and a bottom portion 23b, and a flange portion 24a that protrudes radially outward is formed at an end portion of the cylindrical portion 23a. Thereby, the strength and rigidity of the partition member 24 are further increased.

  The partition member 25 shown in FIG. 6 is formed into a cup shape by pressing from an austenitic stainless steel plate, and is integrally molded on the back side of the insertion hole 17a. The partition member 25 is further formed with a cylindrical portion 25a and a flange portion 25b via a cylindrical portion 23a, a bottom portion 23b, and a flange portion 24a protruding from an end portion of the cylindrical portion 23a. Thereby, the strength and rigidity of the partition member 25 can be further increased, and the partition member 25 can be firmly fixed to the mounting portion 17.

  The partition member 26 shown in FIG. 7 is formed into a cup shape from an austenitic stainless steel plate by pressing and is integrally molded so as to be exposed to the insertion hole 17a. The depth h1 of the partition member 26 is set to be in the range of 70 to 90% of the tip length h0 of the rotation speed sensor 19. Thereby, while the contact area with the synthetic resin of the attaching part 17 increases and the adhering force becomes high, the contact area with the rotational speed sensor 19 increases, and the sealing performance can be improved. The tip length h0 of the rotation speed sensor 19 refers to the length from the mounting seat surface of the rotation speed sensor 19 to the tip portion where the magnetic detection element is located.

  The partition member 26 shown in FIG. 8 protrudes to the back side of the insertion hole 17a and is integrally molded, and a part of the cylindrical portion 23a is exposed. Accordingly, the cylindrical portion 23a can be molded while the outer diameter portion is supported by the mold, and the positioning accuracy of the partition member 26 is improved, and the shape and dimensions of the pulsar ring are not restricted, and the degree of freedom in design is increased.

  The partition member 27 shown in FIG. 9 is formed in a circular shape by punching from an austenitic stainless steel plate, and is integrally joined to the opening on the back side of the insertion hole 17a by ultrasonic welding or the like. Thereby, while being able to improve sealing performance, the man-hour of the partition member 27 can be reduced significantly and cost reduction can be achieved.

  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 second-generation or third-generation wheel bearing device of an inner ring rotation type.

DESCRIPTION OF SYMBOLS 1 Hub wheel 1a, 7a Inner rolling surface 1b Small diameter step part 1c Clamping part 2 Double row rolling bearing 3 Inner member 4 Outer member 4a Outer rolling surface 4b Car body mounting flange 5 Rolling element 6 Wheel mounting flange 6a Hub bolt 6b Base 7 Inner ring 8 Cage 9, 10 Seal 11 Cover 12 Pulsar ring 13 Support ring 13a Fitting portion 13b Standing plate portion 14 Magnetic encoder 15 Cover body 16 Core metal 17 Mounting portion 17a Insertion hole 18 Sensor unit 19 Rotation speed sensor 20 Mounting Member 21 Fixing bolts 22, 23, 24, 25, 26, 27 Partition members 23a, 25a Cylindrical portion 23b Bottom portions 24a, 25b Gutter 51 Outer member 51a Outer rolling surface 51b Car body mounting flange 52 Inner member 53 Ball 54 Wheel Mounting flange 55 Hub wheel 55a, 56a Inner rolling surface 55b Small diameter step 56 Inner ring 57 Cage 58 Addition Fastening portion 59 Seal 60 Cover 60a Tube portion 60b Cover portion 61 Encoder 61a Mounting portion 61b Encoder main body 62 Sensor mounting portion 63 Sensor mounting hole 64 Sensor 64a Sensor insertion portion 65 Device internal space 66 Partition wall h0 Sensor tip length h1 Partition member Depth of

Claims (11)

An outer member integrally having a vehicle body mounting flange for being attached to the knuckle 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 between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
A pulsar ring that is externally fitted to the inner ring, and whose magnetic properties change alternately and at equal intervals in the circumferential direction;
A synthetic resin cover that is attached to the inner side end of the outer member and closes the inner side opening of the outer member;
In a wheel bearing device with a rotational speed detection device that is mounted on a mounting portion formed on a radially outer portion of the cover and includes a rotational speed sensor that faces the pulsar ring and a predetermined air gap.
An insertion hole is formed in the mounting portion of the cover, and the rotational speed sensor is mounted in the insertion hole, and a partition member made of a non-magnetic steel plate separate from the cover is provided on the back side of the insertion hole. The partition member , which is fixed, includes a cylindrical portion along the insertion hole, a bottom portion that closes the opening on the back side of the insertion hole, and a flange portion that protrudes radially outward at an end portion of the cylindrical portion. The rotation speed sensor and the pulser ring are formed through the partition member in which at least the flange portion is integrally molded in the insertion hole and the plate thickness is set in the range of 0.1 to 0.5 mm. A bearing device for a wheel with a rotational speed detecting device, characterized in that The wheel bearing device with a rotational speed detection device according to claim 1 , wherein the partition member is formed in a stepped shape including two cylindrical portions. The wheel bearing device with a rotation speed detecting device according to claim 1 , wherein the partition member is integrally molded so as to protrude to the back side of the insertion hole so that a part of the cylindrical portion is exposed. The partition member is integrally molded so as to be exposed to the insertion hole, the partition depth of members, the rotational speed claims tip is set to be a length 70% to 90% of the range of the sensor 1 A bearing device for a wheel with a rotational speed detection device according to claim 1. The wheel bearing device with a rotational speed detection device according to claim 1 , wherein the partition member is integrally joined to the opening on the back side of the insertion hole by ultrasonic welding. The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 5, wherein the partition member is formed from an austenitic stainless steel plate by pressing. The cover is composed of a bottomed cylindrical cover body and a core bar integrally molded in the opening of the cover body. The core bar has a substantially L-shaped cross section by pressing from an austenitic stainless steel plate. The wheel bearing device with a rotational speed detection device according to claim 1, wherein the wheel bearing device is formed in an annular shape. The wheel bearing device with a rotational speed detection device according to claim 1, wherein the rotational speed sensor is fixed to the mounting portion by a fixing bolt via a eyebrow-shaped mounting member. The wheel bearing device with a rotation speed detection device according to claim 1, wherein the rotation speed sensor is press-fitted and fixed in the insertion hole. The pulsar ring is integrally joined to the side surface of the support ring formed by pressing from a ferromagnetic steel plate by vulcanization, and magnetic powder is mixed into the elastomer in the circumferential direction. The wheel bearing device with a rotational speed detection device according to claim 1, wherein the wheel bearing device is configured with a magnetic encoder in which magnetic poles N and S are magnetized alternately at equal intervals. The wheel bearing device with a rotational speed detection device according to claim 1, wherein a seal is attached to an opening portion of an annular space formed between an inner side end portion of the outer member and the inner ring.

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