JP2009174576A - Bearing device for wheel with rotation speed detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotating speed detecting device reduced in weight, miniaturized, and improved in reliability by preventing direct intrusion of a foreign material into a detecting part. <P>SOLUTION: A sensor holder 15 includes an annular cover 16 structured of a fitting part 16a to be fitted on an end of an outer member 5, a flange part 16b extending inward from the fitting part 16a in the radial direction and tightly fitted to an end surface 5c of the external member 5, a bottom part 16c extending inward from the flange part 16b in the radial direction, and a cylindrical part 16d extending from the bottom part 16c in the axial direction, and includes a synthetic resin holding part 17, which is bonded to the outer surface over from the flange part 16b to the cylindrical part 16d of the cover 16 and in which a rotating speed sensor 19 is embedded. An end part 2b of an inner ring 2 is projected more than an end surface 5c of the external member 5 and formed at a smaller diameter than the outer diameter, in which a slinger 21 is to be pressed in, and the peripheral surface and the cylindrical part 16d of the cover 16 are arranged to face each other with 0.5-1.5 mm of interval between them in the radial direction, thus constituting a labyrinth seal 26. <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.

  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.

  Generally, 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, a wheel bearing with a rotational speed detection device that has a rotational speed sensor built into the bearing has recently been developed. A device has been proposed.

  A structure as shown in FIG. 5 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 mounted on 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 fitted on the outer member 52, a flange portion 55b extending radially inward from the fitting portion 55a, and a bottom portion 55c extending axially 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.

Further, the inner end of the cover 55 constituting the sensor holder 53, that is, the inner edge of the circular hole 65 in the bottom portion 55c is opposed to the outer peripheral surface of the shoulder portion 66 of the outer joint member 64 through a slight radial clearance, and the labyrinth. A seal 67 is configured. Thereby, it is possible to prevent foreign matter such as magnetic powder from entering between the encoder 51 and the detection unit of the rotation speed sensor 54 even during actual running, which is a harsh environment. Therefore, the reliability of the wheel rotation speed detection device can be further improved.
JP 2006-145418 A

  However, in this conventional wheel bearing device with a rotational speed detecting device, the outer peripheral surface of the shoulder portion 66 of the outer joint member 64 and the inner edge of the circular hole 65 of the bottom portion 55c of the cover 55 are the labyrinth seal 67. It was difficult to obtain sufficient sealing performance due to the short confronting range that exerted the labyrinth effect. Further, since the labyrinth seal 67 is configured between the cover 55 attached to the outer member 52 and the shoulder 66 of the outer joint member 64, it is difficult to accurately define the radial clearance, There was a limit to obtaining high sealing performance.

  The present invention has been made in view of such circumstances, and is intended for a wheel with a rotational speed detection device that is light and compact, and that prevents foreign matter from directly entering the detection unit and improves reliability. It aims at providing a bearing 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, An outer joint member of a constant velocity universal joint is fitted into the hub wheel, and the outer joint member The outer joint member is unitized so as to be able to transmit torque to the hub wheel and be detachable in a state where the portion abuts the inner member, and is attached to the inner end of the outer member. A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel, and a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and the rotation speed sensor is provided with an axial clearance. In the wheel bearing device with a rotation speed detection device incorporating a rotation speed detection device composed of an opposed encoder, the sensor holder is a cylindrical shape that is externally fitted to the inner end of the outer member. A fitting portion, a flange portion extending radially inward from the fitting portion and closely contacting the end surface of the outer member, a bottom portion extending further radially inward from the flange portion, and an axial direction from the bottom portion Extend to A ring-shaped cover made of a cylindrical portion and a synthetic resin in which the rotational speed sensor is embedded integrally joined to one place on the outer surface of the cover extending radially from the flange portion to the cylindrical portion. A holding portion, and an inner side end portion of the inner ring is formed so as to protrude from an end surface of the outer member, and an outer peripheral surface of the end portion and a cylindrical portion of the cover are provided via a predetermined radial clearance. A labyrinth seal is configured to face each other.

  As described above, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the sensor holder includes a cylindrical fitting portion that is fitted on the inner side end portion of the outer member, and the fitting portion. An annular cover comprising a flange extending inward in the radial direction and in close contact with the end face of the outer member, a bottom extending further inward in the radial direction from the flange, and a cylindrical portion extending in the axial direction from the bottom. A synthetic resin holding portion integrally joined to a radially outer portion of the outer surface extending from the collar portion of the cover to the cylindrical portion, and embedded with a rotational speed sensor, on the inner side of the inner ring The labyrinth seal is constructed with high accuracy because the end portion is formed so as to protrude from the end surface of the outer member, and the outer peripheral surface of this end portion is opposed to the cylindrical portion of the cover via a predetermined radial clearance. Radial clearance can be set and sufficient sealing effect It is exhibited. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that prevents foreign matters from directly entering the detection unit from the outside and improves reliability.

  Preferably, as in the invention described in claim 2, if the outer diameter of the end portion of the inner ring is formed smaller than the outer diameter into which the slinger is press-fitted, the labyrinth effect is further exerted and the seal is exerted. Performance can be improved.

  Further, as in the invention described in claim 3, if the radial clearance of the labyrinth seal is set to 2 mm or less, the sealing performance can be improved.

  Moreover, if the axial length of the labyrinth seal is set in the range of 2 to 10 mm as in the invention described in claim 4, the sealing performance can be improved more effectively.

  According to a fifth aspect of the present invention, the encoder includes a magnetic encoder in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction, and the cover Is made of a non-magnetic austenitic stainless steel plate, it does not adversely affect the sensing performance of the rotational speed sensor, and accurate detection accuracy can be ensured.

  Further, as in the invention described in claim 6, if the holding portion is formed of nonmagnetic polyphenylene sulfide to which glass fiber is added, the sensing performance of the rotational speed sensor is not adversely affected, It has excellent corrosion resistance and can improve strength and durability over a long period of time.

  Further, as in the invention described in claim 7, if the holding portion is arranged in a radial upper portion than the horizontal position of the cover and the harness is connected in the tangential direction of the holding portion, the harness itself The length does not become longer than necessary, and the knuckle can be easily taken out to the outer diameter side, so that the assembling workability is improved.

  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 double row rolling element housed in a freely rollable manner between the 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 is fitted inside, and the shoulder of the outer joint member is The outer joint member is unitized so as to be able to transmit torque to the hub wheel and be detachable in a state of being in contact with the inner member, and is attached to the inner side end of the outer member, A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel, and provided on a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and is opposed to the rotation speed sensor via an axial clearance. In a wheel bearing device with a rotation speed detection device incorporating a rotation speed detection device comprising a fixed encoder, the sensor holder is fitted in a cylindrical shape that is fitted on the inner side end of the outer member A flange portion that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, a bottom portion that extends further radially inward from the flange portion, and extends in the axial direction from the bottom portion. Cylindrical part And a synthetic resin holding portion in which the rotational speed sensor is embedded and integrally joined to a radially outer portion of the outer surface extending from the flange portion to the cylindrical portion of the cover. And an inner end of the inner ring is formed so as to protrude from an end surface of the outer member, and an outer peripheral surface of the end is opposed to a cylindrical portion of the cover through a predetermined radial clearance. Since the labyrinth seal is configured, the radial clearance can be set with high accuracy, and a sufficient sealing effect is exhibited. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that prevents foreign matters from directly entering the detection unit from the outside and improves 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 fitted into the hub wheel, and the shoulder portion of the outer joint member is The outer joint member is unitized so as to be able to transmit torque to the hub wheel and be detachable in a state of being in contact with the end face of the inner ring, and is attached to the inner side end of the outer member, A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel and a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and is opposed to the rotation speed sensor via an axial clearance. In a wheel bearing device with a rotational speed detection device incorporating a rotational speed detection device comprising a magnetic encoder, the sensor holder is fitted in a cylindrical shape that is externally fitted to the inner end 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, a bottom portion extending further radially inward from the flange portion, and an axial direction from the bottom portion Extend A ring-shaped cover made of a cylindrical portion and a synthetic resin in which the rotational speed sensor is embedded integrally joined to one place on the outer surface of the cover extending radially from the flange portion to the cylindrical portion. A holding portion, and an inner side end portion of the inner ring protrudes from an end surface of the outer member and is formed to have a smaller diameter than an outer diameter into which the slinger is press-fitted. A labyrinth seal is configured by facing the cylindrical portion of the cover via a radial clearance having a range of 0.5 to 1.5 mm.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 1, and FIG. It is a front view which shows the 1 bearing part. 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 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 and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 serving as a seal land portion of a seal 8 described later. The surface hardness is set in the range of 58 to 64 HRC by induction hardening from the base 6b to the small diameter step 1b. 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 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.

  Here, the wheel bearing device constituted by a double row angular contact ball bearing in which the rolling element 4 is a ball is illustrated, but the present invention is not limited to this, and a double row tapered roller bearing using a tapered roller for the rolling element 4 is used. May be. In addition, although the third-generation wheel bearing device has been illustrated, the present invention is not limited thereto, and may be, for example, a second-generation or 2.5-generation structure.

  The constant velocity universal joint 10 includes an outer joint member 11, a joint inner ring (not shown), a cage, and a torque transmission ball. The outer joint member 11 integrally has a shaft portion 13 extending in the axial direction from the shoulder portion 12. A serration 13 a that engages with the serration 1 c of the hub wheel 1 and an external thread 13 b are formed at the end of the serration 13 a on the outer periphery of the shaft portion 13. Then, the shaft portion 13 of the outer joint member 11 is fitted into the hub wheel 1 through the serrations 1c and 13a until the shoulder portion 12 abuts the end surface of the inner ring 2, and the hub is fixed by the fixing nut 14 fastened to the male screw 13b. The wheel 1 and the outer joint member 11 are unitized so that torque can be transmitted and detachable.

  In the present embodiment, the sensor holder 15 is attached to the inner side end of the outer member 5. The sensor holder 15 includes a cover 16 formed in a cup shape and a holding portion 17 coupled to the cover 16. As shown in an enlarged view in FIG. 2, the cover 16 has a cylindrical fitting portion 16a that is press-fitted into the outer periphery of the inner side end portion of the outer member 5, and extends radially inward from the fitting portion 16a. The flange portion 16b closely contacts the end surface 5c of the outer member 5, the bottom portion 16c extending radially inward from the flange portion 16b, and the cylindrical portion 16d extending further in the axial direction from the bottom portion 16c. It is formed in an annular shape.

  As described above, the fitting portion 16a is fitted on the inner side end portion of the outer member 5 in a state where the flange portion 16b is in close contact with the end surface 5c of the outer member 5. On the other hand, the sensor holder 15 can be positioned and fixed easily and accurately, and the rotational speed of the wheel can be detected with high accuracy. The cover 16 is formed by pressing a non-magnetic steel plate having a 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 19 to be described later, and that prevents rusting of the cover 16 and maintains reliability over a long period of time. can do. In addition, the cover 16 can illustrate the cold rolled steel plate (JIS standard SPCC etc.) by which the antirust process was carried out besides the material mentioned above.

  Further, as shown in FIG. 3, the holding portion 17 is integrally joined to one place on the outer surface in the radial direction on the outer surface extending from the flange portion 16 b to the cylindrical portion 16 d of the cover 16. The phase at which the holding portion 17 is disposed is arranged at an upper portion in the radial direction than the horizontal position of the cover 16 (upper portion in the vertical direction in the figure), and a harness 18 is connected in a tangential direction of the holding portion 17. Thereby, the length of the harness 18 itself does not become longer than necessary, and it is easy to take out to the outer diameter side of the knuckle, so that the assembling workability is improved.

  The holding portion 17 is formed by injection molding from a non-magnetic special ether-based synthetic resin material such as polyphenylene sulfide (PPS), and further a reinforcing material such as GF (glass fiber) is added. As a result, the sensing performance of the rotation speed sensor 19 is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time. The rotational speed sensor 19 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 the magnetic detecting element. It consists of IC. In addition to the above-described materials, the holding portion 17 can be exemplified by synthetic resins that can be injection molded such as PA (polyamide) 66, PPA (polyphthalamide), PBT (polybutylene terephthalate).

  The inner-side seal 9 is constituted by a so-called pack seal comprising an annular seal plate 20 mounted on the end portion of the outer member 5 and a slinger 21 disposed opposite to the seal plate 20. Yes. The seal plate 20 includes a cored bar 22 fitted into an end portion on the inner side of the outer member 5, and a seal member 23 vulcanized and bonded to the cored bar 22.

  The metal core 22 is formed into a substantially L-shaped cross section by pressing 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). Has been. The seal member 23 is made of an elastic member such as synthetic rubber, and is made up of a side lip 23a, a grease lip 23b, and an intermediate lip 23c.

  On the other hand, the slinger 21 includes a cylindrical portion 21a that is press-fitted and fixed to the outer diameter of the inner ring 2, and a vertical plate portion 21b that extends radially outward from the cylindrical portion 21a. It is formed into a substantially L-shaped cross section by press working from a stainless steel plate (JIS standard SUS430 system or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC system or the like). The side lip 23a of the seal member 23 is in sliding contact with the upright plate portion 21b, and the grease lip 23b and the intermediate lip 23c are in sliding contact with the cylindrical portion 21a.

  A magnetic encoder 24 in which a magnetic substance powder such as ferrite is mixed in an elastomer such as rubber is integrally joined to the side surface on the inner side of the upright plate portion 21b by vulcanization adhesion or the like. The magnetic encoder 24 is alternately magnetized with magnetic poles N and S in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel. Further, the outer edge of the standing plate portion 21 b in the slinger 21 is opposed to the seal plate 20 through a slight radial clearance to form a labyrinth seal 25.

  Here, the inner end 2 b of the inner ring 2 is formed so as to protrude from the end surface 5 c of the outer member 5. The slinger 21 is formed to have a smaller diameter than the outer diameter into which the slinger 21 is press-fitted. And the outer peripheral surface of this edge part 2b and the cylindrical part 16d of the cover 16 are opposed to each other through a predetermined radial clearance, and a labyrinth seal 26 is configured. Thereby, a labyrinth effect can be exhibited and sealing performance can be improved. The radial clearance between the cover 16 and the end 2b of the inner ring 2 is set to 2.0 mm or less, preferably in the range of 0.5 to 1.5 mm. The axial length of the labyrinth seal 26 is set in the range of 2 to 10 mm. As described above, in the present embodiment, the labyrinth seal 26 having a desired axial length is formed between the cover 16 press-fitted into the outer member 5 and the inner ring 2, so that the radial clearance can be accurately obtained. It can be set and exhibits a sufficient sealing effect. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that prevents foreign matters from directly entering the detection unit from the outside and improves reliability.

  Furthermore, in the present embodiment, as shown in FIG. 2, a drain 27 is formed at one place in the circumferential direction closest to the road surface of the bottom 16 c in the cover 16. Even if foreign matter such as muddy water or pebbles enters the bottom portion 16c while the vehicle is running, the drain 27 is easily discharged to the outside and does not stay for a long time. Therefore, it is possible to prevent foreign matters from adhering when the vehicle is stopped and adversely affecting peripheral components, and the reliability can be further improved.

  Here, as an example of the rotational speed detection device, an active type rotational speed detection device including the magnetic encoder 24 and the rotational speed sensor 19 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection according to the present invention is illustrated. The apparatus is not limited to this, and may be a passive type including, for example, a gear, a magnet, and an annular coil wound.

  FIG. 4 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a rotation speed detection device according to the present invention. Note that this embodiment basically differs from the above-described embodiment only in a part of the configuration of the hub wheel, and the same reference numerals are given to the same parts or parts having the same functions as those of the above-described embodiments. Detailed description will be omitted.

  This wheel bearing device with a rotational speed detecting device is called a third generation for driving wheels, and includes an inner member 29 composed of a hub wheel 28 and an inner ring 2, and double row rolling elements 4, 4 on the inner member 29. And an outer member 5 inserted through the outer periphery.

  The hub wheel 28 integrally has a wheel mounting flange 6 at an outer end, an outer inner rolling surface 1a on the outer periphery, and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface 1a. 1b is formed. An inner ring 2 having an inner-side inner rolling surface 2a formed on the outer periphery is press-fitted into the small-diameter step portion 1b through a predetermined shimoshiro. Then, the inner ring 2 is fixed in the axial direction with respect to the hub wheel 28 in a state where a predetermined bearing preload is applied by a crimping portion 30 formed by plastically deforming an end portion of the small diameter step portion 1b radially outward. Has been.

  The hub wheel 28 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon, such as S53C, and extends from the inner rolling surface 1a to the small diameter step portion 1b from the inner base portion 6b of the wheel mounting flange 6. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. In addition, the crimping part 30 is made into the surface hardness after a forge process.

  Here, in this embodiment, the end surface of the crimping part 30 is formed into a flat surface, and the crimping part 30 and the shoulder 12 of the outer joint member 11 are in surface contact. As a result, the surface pressure applied to the caulking portion 30 based on the tightening force of the fixing nut 14 can be reduced, and plastic deformation of the caulking portion 30 and loosening of the fixing nut 14 can be prevented, and a large moment load can be applied. Even when loaded, sufficient rigidity can be exhibited.

  Further, as in the above-described embodiment, the holding portion 17 is integrally joined to the outer surface of the cover 16 constituting the sensor holder 15, and the inner side end portion 2 b of the inner ring 2 is more than the end surface of the outer member 5. A labyrinth seal 26 is formed by projecting and the outer peripheral surface of the end 2b and the cylindrical portion 16d of the cover 16. Here, the protruding holding portion 17 and the caulking portion 30 are formed substantially flush with each other. Thereby, in an assembly process, an apparatus can be mounted vertically and assembly workability | operativity can be improved.

  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.

1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotation speed detection device according to the present invention. It is a principal part enlarged view which shows the detection part of FIG. It is a front view which shows the bearing part of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1, 28 ················ Hub wheel 1a, 2a ········· Inner rolling surface 1b ··········· Small diameter step 1c, 13a ... Serration 2 ... Inner ring 2b ... Inner ring Ends 3 and 29 of the inner member 4 ... the rolling element 5 ... ...... Outer member 5a ... Outer rolling surface 5b ... Car body mounting flange 5c ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ End face 6 of the outer member ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ... Base 7 ... Retainer 8 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side seal 10 ・ ・ ・ ・ ・ ・ ・ ・・ Constant velocity universal joint 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Shaft 13b ... Male thread 14 ... Fixing nut 15 ... .... Sensor holder 16 ..... Cover 16a ..... Fitting part 16b ... ... Right part 16c ......... Bottom part 16d, 21a ......... Cylindrical part 17 ......... Hold Part 18 ... Harness 19 ...・ ・ ・ Rotational speed sensor 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 21 ・ ・ ・ ・ ・ ・ ・ ・ Slinger 21b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Standing plate 22 ......... Core 23 ......... Seal member 23a ...・ ・ ・ ・ Side lip 23b ・ ・ ・ ・ ・ ・ ・ ・ Grease lip 23c ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Magnetic encoders 25, 26 ... Labyrinth seal 27 ... Drain 30 ...・ ・ Casting part 50 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..Outer member 53 ...・ ・ Sensor holder 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 55a ············································ 55・ Seal 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 57a ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical portion 57b ・ ・ ・ ・ ・ ・ ・ ・ Vertical plate Part 58 ... seal plate 59 ... cored bar 60 ... Sealing member 60a ... Side lip 60b ... Grease lip 60c ... Intermediate lip 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holder 62 ・ ・ ・ ・ ・ ・ ・ ・... Harness 63 ... Extraction port 64 ... Outer joint member 65 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Round hole 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inclination angle

Claims (7)

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;
An outer joint member of a constant velocity universal joint is fitted into the hub wheel, and the outer joint member can transmit torque to the hub wheel in a state where a shoulder portion of the outer joint member abuts on the inner member. And it is unitized so that it can be attached and detached,
A sensor holder mounted on the inner side end of the outer member and provided with a rotation speed sensor for detecting the rotation speed of the wheel, and a side surface of a slinger that is fitted on the inner ring and constitutes the seal. In the wheel bearing device with a rotational speed detection device provided therein, the rotational speed detection device comprising an encoder opposed to the rotational speed sensor via an axial clearance,
The sensor holder has a cylindrical fitting portion that is fitted on the inner end of the outer member, and extends radially inward from the fitting portion, and is in close contact with the end surface of the outer member. An annular cover comprising a flange portion, a bottom portion extending further radially inward from the flange portion, and a cylindrical portion extending in the axial direction from the bottom portion, and a diameter of the outer surface of the cover extending from the flange portion to the cylindrical portion A synthetic resin holding part integrally joined to one place outside the direction and embedded with the rotational speed sensor;
An inner side end portion of the inner ring is formed so as to protrude from an end surface of the outer member, and an outer peripheral surface of the end portion and a cylindrical portion of the cover are opposed to each other through a predetermined radial clearance to form a labyrinth seal. A wheel bearing device with a rotation speed detecting device, characterized in that the wheel bearing device is configured.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein an outer diameter of an end portion of the inner ring is formed to be smaller than an outer diameter into which the slinger is press-fitted.   The wheel bearing device with a rotational speed detection device according to claim 1 or 2, wherein a radial clearance of the labyrinth seal is set to 2 mm or less.   The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 3, wherein an axial length of the labyrinth seal is set in a range of 2 to 10 mm.   The encoder is composed of a magnetic encoder in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction, and the cover is made 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.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 5, wherein the holding portion is made of nonmagnetic polyphenylene sulfide to which glass fiber is added.   The wheel bearing with a rotation speed detecting device according to any one of claims 1 to 6, wherein the holding portion is arranged in a radial upper portion with respect to a horizontal position of the cover, and a harness is connected in a tangential direction of the holding portion. apparatus.

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