JP2008202943A - Wheel bearing with rotational speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing with rotational speed detector improved in detection precision and reliability while inhibiting foreign matter from invading by enhancing the sealing performance of the detecting part while intending to downsize. <P>SOLUTION: The sensor holder 10 comprises: the holder part 12 of synthetic resin in which the rotational speed sensor 14 is embedded; and the cover 11 comprising the cylindrical fitting part 11a for externally fitting with the end of the external member 5, the flange part 11b extending radially inward for being brought into close contact with the end part of the external member 5, and the bottom 11c extending radially inward. The holder part 12 is formed in a shape along the profile of the shoulder 23 of the external joint member 22, where the shoulder 23 is opposite to the holder part 12 through the clearance for constituting the labyrinth seal 26, also the holder part 12 is arranged on the radially outward one point of the bottom 11c in the vertical direction of the road surface in an inclination range of 30-90°. From the holding part 12 the harness 21 is extending in the tangential direction of the cover 11. <P>COPYRIGHT: (C)2008,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.

  A wheel bearing with a rotation speed detecting device that rotatably supports a vehicle wheel with respect to a suspension device and controls an anti-lock brake system (ABS) to detect the rotation speed of the wheel. 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 adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing for a wheel with a rotational speed detection device that also incorporates the rotational speed sensor in the bearing. A device 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. This rotational speed detection device includes an encoder 51 fitted on the inner ring 50, a sensor holder 53 attached to the end of the outer member 52 so as to face the encoder 51, and a predetermined air to the encoder 51. And a rotation speed sensor 54 facing each other through a gap. The encoder 51 is joined to the side surface of the slinger 57 constituting the seal 56.

  The seal 56 includes a slinger 57 having a substantially L-shaped cross section, and an annular seal plate 58 attached to the outer member 52 so as to face the slinger 57 and having a substantially L-shaped cross section. The slinger 57 includes a cylindrical portion 57a that is externally fitted to the inner ring 50, and a standing plate portion 57b that extends radially outward from the cylindrical portion 57a. On the other hand, the seal plate 58 includes a metal core 59 fitted into the end of the outer member 52, and a seal member 60 vulcanized and bonded to the metal core 59. The seal member 60 is made of an elastomer such as rubber, and includes a side lip 60a that is in sliding contact with the standing plate portion 57b of the slinger 57, and a grease lip 60b and an intermediate lip 60c that are in sliding contact with the cylindrical portion 57a.

  The sensor holder 53 includes a steel plate cover 55 fitted on the outer member 52 and a synthetic resin holding portion 61 coupled to the bottom portion 55c of the cover 55. The rotation speed sensor is connected to the holding portion 61. 54 is embedded. The cover 55 includes a cylindrical fitting portion 55a in which the outer member 52 is fitted, a flange portion 55b extending radially inward from the fitting portion 55a, and a bottom portion 55c extending in an axial direction from the flange portion 55b. It consists of.

  The output of the rotational speed sensor 54 is taken out by the harness 62 and sent to an ABS controller (not shown). The harness 62 is connected via an extraction port 63 provided in the holding portion 61, and the extraction port 63 is formed at an inclination angle α set larger than the inclination angle β of the outer peripheral surface of the outer joint member 64. ing.

As a result, the harness 62 can be prevented from sagging and interfering with the outer joint member 64, so that the number of clips for stopping the harness 62 from sagging can be minimized, and the harness 62 itself need not be bent excessively. Therefore, the adverse effect on the internal wiring can be prevented and the reliability can be further improved. Therefore, the fixing work of the harness 62 can be simplified with a simple configuration, the assembling workability can be improved, and the cost can be reduced.
JP 2006-145418 A

  However, since the conventional wheel bearing device with a rotational speed detection device is exposed to a severe environment near the road surface, the encoder 51 is composed of, for example, a magnetic encoder in which magnetic poles are alternately arranged in the circumferential direction. When the rotational speed sensor 54 facing the encoder 51 through a predetermined air gap is composed of a magnetic detection element such as a Hall element, mud salt water or magnetic powder is added to the detection unit between the encoder 51 and the rotational speed sensor 54. If foreign matter such as muddy water containing water enters, the detection accuracy may be reduced and reliability may be impaired.

  Further, in order to connect the harness 62 while inclining along the outer peripheral surface of the outer joint member 64, it is necessary to form the take-out port 63 so as to protrude from the holding portion 61 in the axial direction. This requires a considerable amount of space around the shoulder portion 65 of the outer joint member 64, which restricts the shape and dimensions of the outer joint member 64 and hinders downsizing of the apparatus.

  The present invention has been made in view of the above circumstances, and has achieved a reduction in size and a rotational speed that improves the detection accuracy and reliability by improving the sealing performance of the detection unit to prevent foreign matter from entering. The object is to provide a wheel bearing device with a detection device.

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. And a hub wheel having a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step of the hub wheel. An inner member formed of at least one inner ring press-fitted into a portion, and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and the inner member and the outer member A double row rolling element accommodated between the rolling surfaces of the two rolling surfaces, and a seal attached to an opening of an annular space formed between the outer member and the inner member, The outer joint member of the constant velocity universal joint can transmit torque to the hub wheel and can be attached and detached. And a sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel, and externally fitted to the inner ring and the seal In the wheel bearing device with a rotation speed detection device, the rotation speed detection device is built in which a rotation speed detection device comprising a magnetic encoder which is joined to a side surface of the slinger constituting the rotation angle sensor and is opposed to the rotation speed sensor via an axial clearance is provided. A holder made of a synthetic resin in which the rotational speed sensor is embedded; a cylindrical fitting portion that is formed in an annular shape by pressing from a steel plate and is fitted on the end of the outer member; The holding portion includes a flange portion extending radially inward from the fitting portion and being in close contact with an end surface of the outer member, and a bottom portion extending further radially inward from the flange portion. But, The labyrinth seal is configured to confront the shoulder portion of the outer joint member via a radial clearance, and the holding portion is integrally joined to one place radially outward of the bottom portion of the cover. A harness extends radially outward from the portion.

  Thus, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the sensor holder is formed in an annular shape by pressing from a synthetic resin holding portion in which the rotation speed sensor is embedded, and a steel plate, A cylindrical fitting portion that is externally fitted to the end portion of the outer member, a flange portion that extends radially inward from the fitting portion and that is in close contact with the end surface of the outer member, and a diameter further from the flange portion. And a cover formed of a bottom portion extending inward in the direction, the holding portion is opposed to the shoulder portion of the outer joint member via a radial clearance to form a labyrinth seal, and the holding portion is a bottom portion of the cover. Since the harness extends radially outward from this holding part, the space around the shoulder of the outer joint member can be saved, and the device can be made compact. The detector is sealed It can be the enhance foreign matter is prevented from entering, provide the detection accuracy and speed detector equipped wheel support bearing assembly with improved reliability.

  Preferably, as in the invention described in claim 2, the holding portion is disposed to be inclined in a range of 30 to 90 ° with respect to the direction perpendicular to the road surface, and the harness extends in the tangential direction of the cover from the holding portion. If it is extended, the harness can be easily taken out to the outer diameter side of the knuckle, improving the workability of assembly, minimizing the length of the harness, and preventing adverse effects on the internal wiring due to bending etc. Can be improved.

  In addition, as in the invention according to claim 3, if the holding portion is formed in a shape along the outer shape of the shoulder portion, the space between the bearing portion and the outer joint member can be effectively utilized. Can be made more compact.

  If the cover is made of a non-magnetic austenitic stainless steel plate as in the invention described in claim 4, the detection performance of the rotational speed sensor is not adversely affected, and accurate detection accuracy is ensured. can do.

  Moreover, if the labyrinth seal which has radial clearance between the internal diameter of the said cover and the shoulder part of the said outside joint member is comprised like invention of Claim 5, rainwater etc. in the cover from the outside It is possible to improve the reliability by preventing the entry of foreign matter.

  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. A hub ring having a member and a wheel mounting flange for mounting a wheel at one end, and having a cylindrical small diameter step portion extending in the axial direction on the outer periphery, and a press fit into the small diameter step portion of the hub ring An inner member comprising at least one inner ring and formed on the outer periphery with a double row inner rolling surface facing the double row outer rolling surface, and both rolling of the inner member and the outer member. A constant-velocity universal joint comprising: a double row of rolling elements housed between the surfaces so as to roll freely; and a seal attached to an opening of an annular space formed between the outer member and the inner member. The outer joint member is capable of transmitting torque to the hub wheel and is detachable. And a sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel, and the seal holder that is externally fitted to the inner ring In the wheel bearing device with a rotation speed detection device, the rotation speed detection device is built in which a rotation speed detection device comprising a magnetic encoder which is joined to a side surface of the slinger constituting the rotation angle sensor and is opposed to the rotation speed sensor via an axial clearance is provided. A holder made of a synthetic resin in which the rotational speed sensor is embedded; a cylindrical fitting portion that is formed in an annular shape by pressing from a steel plate and is fitted on the end of the outer member; The holding portion includes a flange portion extending radially inward from the fitting portion and being in close contact with an end surface of the outer member, and a bottom portion extending further radially inward from the flange portion. But outside the above A labyrinth seal is configured to confront the shoulder portion of the joint member via a radial clearance, and the holding portion is integrally joined to one place radially outward of the bottom portion of the cover. Since the harness extends radially outward, space saving around the shoulder of the outer joint member can be realized, the device can be made compact, and the detector can be sealed to prevent foreign objects from entering. Thus, it is possible to provide a wheel bearing device with a rotational speed detection device with improved detection accuracy and reliability.

  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 formed on the outer periphery with an inner rolling surface facing one of the double row outer rolling surfaces, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface; and An inner member comprising an inner ring press-fitted into the small-diameter step portion of the hub wheel and having an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member and the outer member A double row rolling element housed between the rolling surfaces of the member so as to be freely rollable, and a seal attached to an opening of an annular space formed between the outer member and the inner member. The outer joint member of the constant velocity universal joint is capable of transmitting torque to the hub wheel and is detachable. And a sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel, and the seal holder that is externally fitted to the inner ring In the wheel bearing device with a rotation speed detection device, the rotation speed detection device is built in which a rotation speed detection device comprising a magnetic encoder which is joined to a side surface of the slinger constituting the rotation angle sensor and is opposed to the rotation speed sensor via an axial clearance is provided. A holder is formed in a circular shape by press working from a synthetic resin holding portion in which the rotation speed sensor is embedded and a non-magnetic steel plate, and is fitted into an end portion of the outer member. A cover comprising: a fitting portion; a flange portion extending radially inward from the fitting portion and being in close contact with the end surface of the outer member; and a bottom portion extending further radially inward from the flange portion. , The holding part The labyrinth seal is formed in a shape along the outer shape of the shoulder portion of the outer joint member, and is opposed to the shoulder portion via a radial clearance, and the holding portion is formed on the bottom portion of the cover. The harness is disposed at a position radially outward in a range of 30 to 90 ° with respect to the direction perpendicular to the road surface, and a harness extends in a tangential direction of the cover from this holding portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a main part showing a detection unit of FIG. It is an 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 called a third generation for driving wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements (balls) on the inner member 3. 4 and 4 and an outer member 5 that is inserted through 4 and 4.

  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, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Further, an outer side (one) inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery, and a torque transmission serration ( Or a spline) 1c is formed. An inner ring 2 having an inner side (the other side) inner raceway surface 2a formed on the outer periphery thereof is press-fitted and fixed to the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro.

  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 a base portion 6b of a wheel mounting flange 6 serving as a seal land portion of a seal 8 described later. The surface hardness of the small-diameter step portion 1b is set to a range of 58 to 64 HRC by induction hardening. As a result, not only the wear resistance of the base portion 6b is improved, but also the fretting of the small-diameter stepped portion 1b serving as the fitting surface of the inner ring 2 is suppressed and the rotational bending load applied to the wheel mounting flange 6 is suppressed. And sufficient mechanical strength, and the durability of the hub wheel 1 is improved. The inner ring 2 and the rolling element 4 are made of a high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core by quenching.

  The outer member 5 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 5b for attaching to a knuckle (not shown) on the outer periphery. The inner member 3 is integrally formed with double row outer rolling surfaces 5a, 5a facing the double row inner rolling surfaces 1a, 2a. These outer rolling surfaces 5a and 5a are subjected to a hardening process in a range of 58 to 64 HRC by induction hardening. Double row rolling elements 4, 4 are accommodated between outer rolling surfaces 5a, 5a of the outer member 5 and double row inner rolling surfaces 1a, 2a facing the outer rolling surfaces 5a, 5a, respectively. It is held so that it can roll freely. 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 13 includes an outer joint member 22, a joint inner ring (not shown), a cage, and a torque transmission ball. The outer joint member 22 integrally includes a shaft portion 24 extending in the axial direction from the shoulder portion 23. A serration 24a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 24, and a male screw 24b is formed at the end of the serration 24a. Then, the outer joint member 22 is internally fitted to the hub wheel 1 through the serrations 1c and 24a until the shoulder portion 23 abuts with the end surface of the inner ring 2, and the hub wheel 1 and the outer side are fixed by the fixing nut 25 fastened to the male screw 24b. The joint member 22 is unitized so that torque can be transmitted and detachable.

  In the present embodiment, the sensor holder 10 is attached to the end of the outer member 5. The sensor holder 10 includes a cover 11 formed in a cup shape and a holding portion 12 coupled to the cover 11. As shown in an enlarged view in FIG. 3, the cover 11 is a cylindrical fitting portion 11a that is press-fitted into the outer periphery of the outer member 5, and extends radially inward from the fitting portion 11a. And a bottom portion 11c extending further inward in the radial direction from the flange portion 11b, and is formed in an annular shape as a whole.

  Thus, since the fitting part 11a is externally fitted to the end part of the outer member 5 in a state where the flange part 11b is in close contact with the end surface of the outer member 5, the sensor holder is attached to the outer member 5. 10 can be positioned and fixed easily and accurately, and the rotational speed of the wheel can be detected with high accuracy. The cover 11 is formed by pressing a non-magnetic steel plate having corrosion resistance, for example, a stainless steel plate such as an austenitic stainless steel plate (JIS standard SUS304 type or the like). As a result, there is provided a wheel bearing device with a rotational speed detection device that does not adversely affect the sensing performance of the rotational speed sensor 14 to be described later, and that prevents rusting of the cover 11 and maintains reliability over a long period of time. can do.

  Here, the holding part 12 is integrally joined to one place radially outward of the bottom part 11 c in the cover 11. The holding portion 12 is formed by injection molding from a non-magnetic synthetic resin material such as polyphenylene sulfide (PPS) and is opposed to a magnetic encoder 16 described later via a predetermined axial clearance (air gap). Is embedded. This rotational speed sensor 14 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of this magnetic detecting element. IC. Thereby, it is possible to detect the rotational speed with high reliability at low cost. In addition, the holding | maintenance part 12 can illustrate synthetic resins which can be injection-molded, such as PA (polyamide) 66 and polybutylene terephthalate (PBT) other than the material mentioned above.

  A slinger 15 is press-fitted into the outer diameter of the inner ring 2 so as to face the holding portion 12 in the axial direction. The slinger 15 constitutes an inner seal 9 and includes a cylindrical portion 15a that is press-fitted into the inner ring 2, and a standing plate portion 15b that extends radially outward from the cylindrical portion 15a. The slinger 15 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). Are formed into a substantially L-shaped cross section by pressing. A magnetic encoder 16 in which magnetic material powder such as ferrite is mixed in an elastomer such as rubber is integrally joined to the inner side surface of the standing plate portion 15b of the slinger 15 by vulcanization adhesion or the like. The magnetic encoder 16 is magnetized with magnetic poles N and S alternately in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel.

  The inner-side seal 9 includes the slinger 15 and an annular seal plate 17 that is mounted on the outer member 5 so as to face the slinger 15 and has a substantially L-shaped cross section. The seal plate 17 includes a cored bar 18 including a cylindrical part 18a fitted into the end of the outer member 5, and a standing plate part 18b extending radially inward from one end of the cylindrical part 18a. The seal member 19 is vulcanized and bonded to the gold 18. The metal core 18 is formed by press working from 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).

  On the other hand, the seal member 19 is made of an elastic member such as synthetic rubber, and includes a side lip 19a that is in sliding contact with the standing plate portion 15b of the slinger 15, and a grease lip 19b and an intermediate lip 19c that are in sliding contact with the cylindrical portion 15a. Further, the outer edge of the standing plate portion 15b of the slinger 15 is opposed to the cylindrical portion 18a of the core metal 18 through a slight radial clearance to form a labyrinth seal 20.

  In the present embodiment, the inner seal 9 and the sensor holder 10 are disposed opposite to each other in the axial direction, the magnetic encoder 16 is integrally joined to the slinger 15 constituting the seal 9, and the holding part constituting the sensor holder 10. 12, the rotational speed sensor 14 is embedded, and the rotational speed sensor 14 and the magnetic encoder 16 are arranged to face each other in the axial direction. Then, as shown in FIG. 2, the output of the rotation speed sensor 14 is taken out by the harness 21 and sent to an ABS controller (not shown). The harness 21 is wired so as to extend radially outward from the holding portion 12. Here, the holding portion 12 is disposed in a range of 30 to 90 ° with respect to the direction perpendicular to the road surface, and the harness 21 extends from the holding portion 12 in the tangential direction of the cover 11 and is connected to the rotation speed sensor 14. . Thereby, space saving around the shoulder portion 23 of the outer joint member 22 can be realized, the apparatus can be made compact, and the harness 21 can be easily taken out to the outer diameter side of the knuckle, so that the assembling workability is improved.

  Here, if the inclination angle θ of the holding portion 12 coupled to the cover 11 is smaller than 30 ° with respect to the direction perpendicular to the road surface, the harness 21 is excessively bent and taken out to the outer diameter side of the knuckle. 12, the bending angle of the harness 21 increases. This is undesirable because it may adversely affect the internal wiring and impair reliability. On the other hand, when the inclination angle θ exceeds 90 °, the length of the harness 21 itself becomes unnecessarily long and the assembling work becomes complicated and the workability is deteriorated. In addition, the harness 21 is knuckle or other peripheral parts. Therefore, the reliability decreases.

  Further, the inner edge of the bottom portion 11c of the cover 11 is formed to have a slightly larger diameter than the outer diameter of the shoulder portion 23 of the outer joint member 22, thereby constituting a labyrinth structure. Thereby, since the magnetic encoder 16 is not exposed to the outside by the bottom portion 11c, it is possible to prevent pebbles and the like from directly colliding with the magnetic encoder 16 from the outside and being damaged.

  Further, as shown in FIG. 3, the holding portion 12 of the sensor holder 10 is formed in a rectangular shape along the outer shape of the shoulder portion 23 of the outer joint member 22, and the inner diameter of the holding portion 12 is slightly radial. A labyrinth seal 26 is formed so as to face the shoulder portion 23 through a gap. As a result, the space between the bearing portion and the outer joint member 22 can be used effectively, and further compactness can be achieved, and the labyrinth seal 26 enhances the sealing performance of the detection portion and foreign matter enters. Can be prevented, detection accuracy can be improved, and reliability can be maintained over a long period of time. The radial clearance between the holding portion 12 and the shoulder portion 23 is preferably set in the range of 0.5 to 3.0 mm. Thereby, interference with both can be avoided and sealing performance can be ensured.

  Here, as an example of the rotational speed detection device, an active type rotational speed detection device including a magnetic encoder 16 and a rotational speed sensor 14 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection device according to the present invention is illustrated. The apparatus is not limited to this, and may be, for example, a passive type including a magnetic encoder, 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 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 built in the inner ring rotation structure.

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 side view same as the above. It is a principal part enlarged view which shows the detection part of FIG. It is a principal part enlarged view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1 .... hub wheel 1a, 2a ... inner raceway surface 1b ... small diameter step 1c, 24a ... ...... Serration 2 ... Inner ring 3 ... Inner member 4 ... Roll Moving body 5 ... Outer member 5a ... Outer rolling surface 5b ... Car body mounting flange 6・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Retainer 8 ... Outer side seal 9 ... Inner side seal 10 ...・ Sensor holder 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 11a ・ ・ ・ ・ ・ ・··· Fitting portion 11b ··· collar 11c ···························································・ ・ ・ ・ Constant velocity universal joint 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 15a, 18a ・ ・ ・ ・ ・ ・ Cylindrical portion 15b , 18b ... Standing plate portion 16 ... Magnetic encoder 17 ... Seal plate 18 ...・ Core 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 19a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 19b ・ ・ ・ ・ ・ ・ Grease lip 19c ・ ・ ・ ・ ・ ・・ ・ ・ ・ Intermediate lip 20, 26 ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal 21 ・ ・ ・ ・ ・ ・ ・ ・ Harness 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 23 ・ ・... ... Shoulder 24 ......... Shaft 24b ... Male thread 25 ......... Fixing nut 50 ... .... Inner ring 51 ... Encoder 52 ... Outer member 53 ... Sensor holder 54 ········ Rotational speed sensor 55 ·········· Cover 55a ... Hut 55c ... Bottom 56 ... Seal 57 ... Slinger 57a ...・ ・ ・ ・ Cylindrical part 57b ・ ・ ・ ・ ・ ・ Standing plate part 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 60 ・..... Seal member 60a ... Side lip 60b ... Grease lip 60c ... Intermediate lip 61 ... Holding part 62 ...・ ・ ・ ・ Harness 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Extraction port 64 ・ ・ ・ ・ ・ ・ Outer joint member 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder α β, θ ・ ・ ・ Inclination angle

Claims (5)

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;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a cylindrical 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 formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
A double row rolling element accommodated in a freely rolling manner 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;
The outer joint member of the constant velocity universal joint is unitized so that torque can be transmitted to the hub wheel and detachable,
A sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel;
Rotational speed detection device having a built-in rotational speed detection device comprising a magnetic encoder externally fitted to the inner ring and joined to a side surface of a slinger constituting the seal and opposed to the rotational speed sensor via an axial clearance. In the bearing device for wheel with
The sensor holder is a synthetic resin holding portion in which the rotational speed sensor is embedded;
A cylindrical fitting portion that is formed into an annular shape by pressing from a steel plate and is fitted to the end portion of the outer member, and extends radially inward from the fitting portion, and is formed on the end surface of the outer member. A cover made up of a collar portion to be in close contact with and a bottom portion extending further radially inward from the collar portion;
A labyrinth seal is configured such that the holding portion faces the shoulder portion of the outer joint member via a predetermined radial clearance,
The bearing for a wheel with a rotational speed detecting device, wherein the holding portion is integrally joined at one place radially outward of the bottom of the cover, and a harness extends radially outward from the holding portion. apparatus.   The rotational speed detection device according to claim 1, wherein the holding portion is disposed to be inclined in a range of 30 to 90 ° with respect to a direction perpendicular to the road surface, and a harness extends from the holding portion in a tangential direction of the cover. Wheel bearing device.   The wheel bearing device with a rotation speed detection device according to claim 1 or 2, wherein the holding portion is formed in a shape along an outer shape of the shoulder portion.   The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 3, wherein the cover is formed of a non-magnetic austenitic stainless steel plate.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein a labyrinth seal having a radial clearance is formed between an inner diameter of the cover and a shoulder portion of the outer joint member.

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