JP2005054994A - Rolling bearing for wheels and bearing device for half-floating type wheels equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing for wheels having a sealing device with a magnetic encoder to protect the magnetic encoder of which a sealing device consists, and improve sensing performance. <P>SOLUTION: The rolling bearing for wheels is provided with a hub wheel 7 having a wheel mounting flange and a small diameter step, an internal member 2 consisting of inner rings 3 and 4 on which inside rolling surfaces 3a and 4a are formed, an external member 1 on which outside rolling surfaces 1a are formed in a plurality of rows, a plurality of rows of rolling elements 5, and sealing devices 9 and 10. The sealing device 10 on the inboard side consists of a protection cover 11 which has one end mounted on the end of the external member 1 and the other end with which a magnet 13 is joined, and a pulser ring 14 mounted on the end on the large diameter side of the inner ring 4 and formed that an encoder 19 formed of a multipolar magnet joined with a cylindrical holder 18c. A detecting sensor 20 is opposed to the cylindrical part 11b of a protection cover 11, and the number of revolutions of a wheel W is detected through the protection cover 11. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a rolling bearing for a wheel that rotatably supports a wheel of an automobile or the like with respect to a vehicle body, and more particularly to a rolling bearing for a wheel having a seal device with a magnetic encoder for detecting a rotational speed and a semi-floating wheel provided with the same. The present invention relates to a bearing device.

2. Description of the Related Art Conventionally, a wheel rolling bearing having a seal device in which a magnetic encoder for detecting the number of rotations of a wheel is attached to a seal is known.
For example, as shown in FIG. 8, the wheel rolling bearing includes first and second annular seal plates 62 and 63 attached to an inner ring 60 and an outer ring 61, respectively. These seal plates 62 and 63 are respectively composed of cylindrical portions 62a and 63a and upright plate portions 62b and 63b, which are formed in an L-shaped cross section and face each other. The standing plate portion 62b of the first seal plate 62 is integrally vulcanized and bonded to an encoder 64 mixed with magnetic powder on the outer side of the bearing. The encoder 64 is composed of a rubber magnet having magnetic poles N and S alternately formed in the circumferential direction, and constitutes a rotary encoder that detects the rotational speed of the wheel.

  The second seal plate 63 is formed by integrally vulcanizing and bonding a seal member 65 having side lips 65a slidably contacting the standing plate portion 62b of the first seal plate 62 and radial lips 65b and 65c slidably contacting the cylindrical portion 62a. Yes. The cylindrical portion 63a of the second seal plate 63 and the tip of the standing plate portion 62b of the first seal plate 62 are opposed to each other through a slight radial clearance, and the labyrinth seal 66 is configured up to this clearance. .

  In a wheel rolling bearing provided with such a sealing device with a magnetic encoder, an encoder 64 mixed with magnetic powder is integrally vulcanized and bonded to the outer side in the axial direction of the first seal plate 62 serving as a slinger. For this reason, the surface of the encoder 64 is exposed to the outside, and dust, sand, or the like is caught in the gap facing the detection sensor 67, and the surface of the encoder 64 may be worn or damaged. As a countermeasure against such a problem, a rolling bearing for a wheel provided with a sealing device as shown in FIG. 9 has been proposed.

In this wheel rolling bearing, a pulse generating ring 71 including a holding plate 71a and a multipolar magnetized encoder 71b is attached to a rotating inner ring 70. The encoder 71b is made of, for example, an elastomer filled with small magnet pieces, and is vulcanized and bonded to the holding plate 71a. A cover member 72 made of a nonmagnetic material is attached to the outer ring 73 on the fixed side, and a seal lip 74 is vulcanized and bonded. The seal lip 74 is in sliding contact with the pulse generating ring 71 to protect the encoder 71b from the influence of the surroundings. A detection sensor 75 is provided in direct contact with the cover member 72. As a result, a radio wave signal can be transmitted through the cover member 72, and dust, sand or the like is caught in the gap between the encoder 71b and the detection sensor 75, and the surface of the encoder 71b is prevented from being worn or damaged. be able to.
JP-A-10-160744

  However, in such a conventional wheel rolling bearing, since the pulse generation ring 71 is arranged in the radial direction and the rotational speed is detected from the outside of the cover member 72 via the detection sensor 75, the radial space of the bearing Due to this limitation, it is difficult to secure a sufficient area of the pulse generating ring 71, and there is a drawback that the rotational speed sensing becomes weak. Further, when this type of wheel rolling bearing is used as a rolling bearing incorporated in a semi-floating wheel bearing device of an automobile having a relatively large vehicle body weight, a seal lip 74 vulcanized and bonded to the cover member 72 includes: It will be directly exposed to the lubricating oil entering from the differential. The lubricating oil of this differential device contains not only a large amount of iron-based wear powder such as gear wear powder, but also a large number of wear powder having a relatively large and sharp shape.

  The above-mentioned conventional radial seal lip 74 has a strong sealing force and has been verified to exhibit high sealing performance and durability against rainwater and dust. If the seal lip 74 is once bitten, the strong lip tension may cause a damage, and conversely, wear and damage of the seal lip 74 may be promoted. Due to wear and damage of the seal lip 74, iron-based wear powder mixed in the lubricating oil is adsorbed to the encoder 71b, not only deteriorating the rotational speed sensing performance of the pulse generating ring 71, but also entering the bearing. There was also a risk of reducing the durability of the bearing.

  The present invention has been made in view of the above circumstances, and includes a rolling bearing for a wheel having a seal device with a magnetic encoder for protecting the magnetic encoder constituting the seal device and improving sensing performance, and the same. An object of the present invention is to provide a semi-floating wheel bearing device.

  In order to achieve the object, the invention according to claim 1 of the present invention has a wheel mounting flange integrally formed at the end portion on the outboard side, and a small diameter step portion extending in the axial direction from the wheel mounting flange is formed. An inner member composed of a hub ring and an inner ring that is fitted to the small-diameter step portion and has at least one double-row inner rolling surface formed on the outer periphery, and is attached to the fixing member. An outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, a double row rolling element accommodated between the outer member and the inner member, and the outer A rolling device for a wheel provided with a sealing device that seals an annular space between the inner member and the inner member, wherein the sealing device on the inboard side of the sealing device has an outer diameter of the outer member serving as a fixed side. One end is attached to the end, and slidably contacts the outer diameter of the end of the inner ring on the rotation side. A seal having a radial lip and a bearing outer side than the seal are attached to the outer diameter of the end of the inner ring and formed in a substantially U-shaped cross section. A pulsar ring in which body powder is mixed and an encoder having magnetic poles alternately formed in the circumferential direction is joined, and one end portion is attached to the outer member on the outer side of the bearing from the pulsar ring, and the other end portion Is provided with a protective cover having a substantially L-shaped cross section made of a non-magnetic material and having a seal with the inner member, and the detection sensor mounted on the fixed member is connected to the encoder via the protective cover. A configuration was adopted in which the number of revolutions was detected in opposition to.

  In this way, the inboard side sealing device includes a seal having a radial lip that is slidably in contact with the outer diameter of the end of the inner ring, and a bearing outer side than the seal. The outer ring is attached to the outer diameter at the end of the inner ring and formed in a substantially U-shaped cross section, and magnetic powder is mixed in the holding part on the outer diameter side, and magnetic poles are alternately formed in the circumferential direction. A pulsar ring to which the encoder is joined, and one end of the outer member is mounted on the outer side of the bearing with respect to the pulsar ring, and a seal is formed between the other end and the inner member. And a protective cover having a substantially L-shaped cross section, and the detection sensor mounted on the fixed member is opposed to the encoder through the protective cover to detect the rotational speed, and thus includes a protective cover and an inward member. The sealed seal prevents foreign matter from entering the bearing. It can stop and protect the encoder, and since the encoder is joined to the cylindrical holding portion, the area of the encoder can be sufficiently secured without being restricted by the radial space of the bearing, It is possible to provide a sealing device with a magnetic encoder that improves the sensing performance. In addition, the sealing member provided on the inner side of the pulsar ring prevents leakage of lubricating grease sealed inside the bearing and prevents iron-based wear powder mixed in the grease inside the bearing from adsorbing to the encoder. You can also

  Further, as in the second aspect of the invention, if a magnet is joined to the other end of the protective cover, the iron-based wear powder mixed in the lubricating oil of the differential gear is actively adsorbed. This prevents the wear powder from entering the bearing. Therefore, it is possible to reliably prevent wear powder from flowing around the encoder and lowering the sensing performance.

  According to a third aspect of the present invention, the seal between the protective cover and the inner member is a labyrinth seal in which the other end of the protective cover is opposed to the inner member through a slight gap. Therefore, it is possible to effectively prevent the wear powder mixed in the lubricating oil of the differential device from entering the bearing.

  Preferably, an annular groove is formed on the end face of the inner ring, and the other end of the protective cover is engaged with the annular groove through a slight labyrinth clearance, as in the invention of claim 4. It is possible to prevent the powder from entering the bearing.

  The seal between the protective cover and the inner member is provided with a side lip on one of the pulsar ring and the protective cover as in the invention described in claim 5, and the side lip is slid on the other. Further, as in the invention described in claim 6, a side lip is provided at the other end of the protective cover, and the side lip is slidably contacted with the end surface of the inner ring. It may be configured.

  Preferably, as in the invention of claim 7, if an annular groove is formed on the end face of the inner ring, and the side lip is brought into sliding contact with the annular groove, the wear mixed in the lubricating oil of the differential gear. It is possible to further prevent the powder from entering the bearing.

  More preferably, in the invention of claim 8, if the side lip is constituted by a filter seal having a predetermined mesh structure, the wear powder mixed in the lubricating oil of the differential device enters the bearing. Can be effectively prevented, and only lubricating oil can be introduced into the bearing. Thereby, the seal lip of the seal member mounted inside the bearing can be lubricated to suppress lip wear.

  According to a ninth aspect of the present invention, there is provided an axle tube supported on a lower surface of a vehicle body, a drive shaft inserted inward of the axle tube, and an opening portion of the drive shaft and the axle tube. Since the wheel rolling bearing according to any one of claims 1 to 8 is mounted between the drive shaft and the inner member, the semi-floating type wheel bearing device in which torque transmission is coupled is adopted. The seal composed of the protective cover and the inner member prevents the ferrous wear powder mixed in the lubricating oil of the differential gear from entering the bearing, and the wear powder moves around the encoder. It is possible to prevent the sensing performance from deteriorating. Further, the seal member can prevent the lubricating oil from entering the bearing from the differential device, and the durability of the bearing can be improved.

  As described above in detail, the wheel rolling bearing according to the present invention has a wheel mounting flange integrally formed at the end portion on the outboard side, and a hub wheel in which a small-diameter step portion extending in the axial direction from the wheel mounting flange is formed. And an inner member comprising an inner ring that is fitted to the small-diameter stepped portion and has at least one inner rolling surface formed on the outer periphery thereof, and is attached to the inner member. An outer member formed with a double-row outer rolling surface facing the inner rolling surface, a double-row rolling element housed between the outer member and the inner member, and the outer member And a sealing device for sealing an annular space between the inner member and a rolling device for a wheel, wherein the sealing device on the inboard side of the sealing device is an outer diameter end portion of the outer member serving as a fixed side. One end part is attached to the inner ring, and it comes into sliding contact with the outer diameter of the end part of the inner ring which is the rotation side A seal having a dial lip, and mounted on the outer diameter of the end of the inner ring on the outer side of the bearing with respect to the seal, is formed in a substantially U-shaped cross section, and has a magnetic powder on the outer diameter side holding portion. And a pulsar ring to which encoders having magnetic poles alternately formed in the circumferential direction are joined, and one end portion is attached to the outer member on the outer side of the bearing with respect to the pulsar ring, and the other end portion is A seal is formed between the inner member and a protective cover having a substantially L-shaped cross section made of a non-magnetic material. A detection sensor mounted on the fixed member is opposed to the encoder via the protective cover. Since the rotation speed is detected, the seal composed of the protective cover and the inner member prevents foreign matter from entering the bearing, protects the encoder, and holds the cylinder. Encoder on the part Since combined and the area of the encoder without any constraints of radial space of the bearing can be sufficiently secured, it is possible to provide a magnetic encoder with sealing device having improved sensing ability. Furthermore, the seal mounted inside the bearing can prevent leakage of lubricating grease sealed inside the bearing and adsorption of iron-based wear powder mixed in the grease inside the bearing onto the encoder.

  A semi-floating wheel bearing device according to the present invention includes an axle tube supported on a lower surface of a vehicle body, a drive shaft inserted inward of the axle tube, and an opening portion of the drive shaft and the axle tube. The semi-floating type wheel bearing device in which the wheel rolling bearing is mounted between and the drive shaft and the inner member are coupled so as to be able to transmit torque is adopted. The seal prevents the iron-based wear powder mixed in the lubricating oil of the differential device from entering the bearing, and the wear powder wraps around the encoder and adsorbs it to reduce the sensing performance. Can be prevented. Furthermore, the seal mounted inside the bearing can prevent the lubricating oil from entering the bearing from the differential device, and the durability of the bearing can be improved.

  A hub wheel integrally having a wheel mounting flange at the end on the outboard side, a hub wheel formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and fitted into the small-diameter step portion, and an inner rolling surface on the outer periphery An inner member formed of a pair of inner rings formed on the outer ring, an outer member mounted on a fixed member, and formed with a double row outer rolling surface facing the inner rolling surface on the inner periphery, and the outer member In a rolling bearing for a wheel, comprising: a double row rolling element housed between a side member and the inner member; and a seal device for sealing an annular space between the outer member and the inner member. The inboard side sealing device includes a seal having a radial lip that is slidably in contact with the outer diameter of the end of the inner ring on the rotation side, with one end mounted on the outer diameter end of the outer member on the fixed side. The outer diameter of the inner ring is mounted on the outer side of the bearing with respect to the seal. A pulsar ring formed with a substantially U-shaped cross section, magnetic powder mixed in a holding portion on the outer diameter side, and an encoder having magnetic poles alternately formed in the circumferential direction, and the pulsar ring A protective cover having a substantially L-shaped cross section made of a non-magnetic material, wherein one end portion is mounted on the outer member on the outer side of the ring with respect to the ring, and a seal is formed between the other end portion and the inner member. And the detection sensor mounted on the fixing member is opposed to the encoder through the protective cover to detect the rotational speed.

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 semi-floating wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

  The wheel rolling bearing according to the present invention rotatably supports a semi-floating drive shaft D / S on the inner side of a housing (axle tube) H supported by a lower surface of a floor of an automobile body via a spring. ing. That is, the semi-floating type wheel bearing device provided with the wheel rolling bearing according to the present invention is configured such that one end of the housing H is coupled to a housing of a differential device (not shown), and the other end opening of the housing H has a wheel. An outer member 1 of the rolling bearing for internal use is fitted and joined together. On the other hand, the drive shaft D / S is formed integrally with the hub wheel 7 constituting the inner member 2 and transmits the power from the engine to the wheel W.

  The wheel rolling bearing is composed of a double row tapered roller bearing, an outer member 1 having a tapered double row outer raceway surface 1a, 1a formed on the inner peripheral surface, and an outer side roll of this double row on the outer peripheral surface. Accommodated between a pair of inner races 3, 4 formed with tapered inner rolling surfaces 3a, 4a facing the running surfaces 1a, 1a, and the outer rolling surfaces 1a, 1a and the inner rolling surfaces 3a, 4a. The double row rolling elements (tapered rollers) 5 and 5 are provided. The double-row rolling elements 5 and 5 are rotatably held by synthetic resin cages 6 and 6.

  The pair of inner rings 3, 4 is press-fitted into the small diameter step 7 a of the hub ring 7. The hub wheel 7 integrally has a wheel mounting flange 8 for mounting the wheel W via the brake rotor B at an end portion on the outboard side, and a small diameter step portion 7a extending in the axial direction from the wheel mounting flange 8 is formed. Has been. Here, the inner member 2 refers to a pair of inner rings 3 and 4 and a hub ring 7. The inner rings 3 and 4 are press-fitted into the small-diameter step portion 7a, and a fixing nut N is fastened to the small-diameter step portion 7a to prevent the inner rings 3 and 4 from coming off in the axial direction.

  The outer member 1 integrally has a flange 1b for positioning with the housing H on the outer periphery, and seal devices 9 and 10 are attached to both ends. The seal device 9 on the outboard side prevents the lubricating grease sealed in the bearing from leaking and prevents rainwater, dust and the like from entering the bearing from the outside. Further, the inboard side sealing device 10 prevents leakage of the lubricating grease sealed in the bearing and prevents the lubricating oil from entering the bearing from the differential device. Here, a double-row tapered roller bearing in which the rolling element 5 is a tapered roller is illustrated, but the present invention is not limited to this, and a double-row angular ball bearing using balls as the rolling element 5 may be used.

  The hub wheel 7 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface hardness of the small diameter stepped portion 7a is hardened to a range of 54 to 64 HRC by induction hardening. On the other hand, the inner rings 3 and 4 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 54 to 64 HRC up to the core by quenching. Further, the outer member 1 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface hardness of the double row outer rolling surfaces 1a and 1a is 54 to 64HRC by induction hardening. It is hardened to the range.

  In the present embodiment, a so-called second-generation structure in which the pair of inner rings 3 and 4 are press-fitted into the small-diameter step portion 7a of the hub wheel 7 is illustrated. A third generation structure in which one of the inner rolling surfaces is directly formed may be used.

  As shown in an enlarged view in FIG. 2, the inboard side sealing device 10 is attached to the outer diameter surface of the end portion of the outer member 1 on the fixed side, and has an annular protective cover 11 having a substantially L-shaped cross section. And an annular seal 12 mounted on the inner diameter surface of the end of the outer member 1 and a pulsar ring 14 having a substantially U-shaped cross section mounted on the outer diameter surface of the inner ring 4 on the rotating side. .

  The protective cover 11 includes a cylindrical mounting portion 11a, a cylindrical portion 11b extending in the axial direction from the mounting portion 11a, a standing plate portion 11c extending radially inward from the cylindrical portion 11b, and the standing plate portion 11c. The magnet 13 is joined to the outside in the axial direction and magnetized by mixing a ferromagnetic powder made of ferrite or the like into an elastomer made of rubber or the like. The protective cover 11 is formed by pressing a non-magnetic steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 or the like). Further, the tip of the magnet 13 of the upright plate portion 11c is opposed to the end surface of the inner ring 4 through a slight gap to constitute a so-called labyrinth seal R. Further, an O-ring 15 is mounted on the outer periphery of the inboard side end portion of the outer member 1 to effectively prevent the lubricating oil from entering the bearing from the differential.

  The seal 12 includes a metal core 16 and a seal member 17. The metal core 16 is formed by pressing a non-magnetic steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304, etc.). The end member 1 is press-fitted into the inner diameter surface of the end portion. Further, the seal member 17 includes a pair of seal lips 17a and 17b that are vulcanized and bonded to the core metal 16 and slidably contact the outer diameter surface of the inner ring 4, and a garter spring 17c that applies a predetermined pressing force to the seal lip 17b. ing. In addition, although the sealing member 17 with the garter spring 17c was illustrated here, of course, it is not restricted to this, The sealing member of various structures is applicable by mounting space and an environment.

  On the other hand, the pulsar ring 14 includes a cored bar 18 and an encoder 19. The cored bar 18 is a cylindrical part 18a that is press-fitted into the outer diameter of the inner ring 4, and a vertical plate part that extends radially outward from the cylindrical part 18a. 18b and a cylindrical holding portion 18c are formed in a substantially U-shaped cross section. The core 18 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). It is formed by press working. An encoder 19 in which magnetic powder is mixed on the outer diameter side is integrally joined to the holding portion 18c by vulcanization adhesion or the like. This encoder 19 is made by mixing a ferromagnetic powder made of ferrite or the like into an elastomer made of rubber or the like, and is magnetized so that the magnetic poles N and S are alternately arranged at a predetermined pitch in the circumferential direction. The magnetic rotary encoder to detect is comprised. In this way, the magnet 19 of the pulsar ring 14 is made of a magnetic steel plate and the protective cover 11 is made of a non-magnetic steel plate, so that the magnetism of the encoder 19 can be increased and the protective cover 11 Prevent adverse effects on sensing performance. Here, the encoder 19 made of elastomer is illustrated, but the present invention is not limited to this, and for example, it may be made of sintered metal obtained by solidifying ferromagnetic powder with a metal binder or the like.

  In this embodiment, the detection sensor 20 is fastened to the outer diameter of the housing H with a bolt 22 via a stopper 21. The detection sensor 20 is mounted in a state of being suspended in the through hole 24 of the housing H through the O-ring 23, and the detection unit 20 a at the tip thereof is opposed to the encoder 19 through the protective cover 11. Note that the detection unit 20 a may be brought into contact with the cylindrical portion 11 b of the protective cover 11.

  Since such a structure is adopted, the iron 13 mixed in the lubricating oil of the differential device by the magnet 13 joined to the protective cover 11 and the labyrinth seal R constituted by the protective cover 11 and the inner member 2. Actively adsorb the wear powder and prevent the wear powder from entering the bearing. Therefore, it is possible to reliably prevent the wear powder from getting around the encoder 19 and deteriorating the sensing performance. In addition, since the encoder 19 is joined to the cylindrical holding portion 18c, a sufficient area of the encoder 19 can be secured without being restricted by the radial space of the bearing, and the magnetic performance for improving the sensing performance can be secured. A sealing device with an encoder can be provided. Further, since the seal member 17 provided on the inner side in the axial direction from the pulsar ring 14 can prevent the lubricating oil from entering the bearing from the differential device, the desired durability of the bearing is maintained. In addition, it is possible to prevent leakage of lubricating grease sealed in the bearing and adsorption of iron-based wear powder mixed in the grease in the bearing to the encoder 19.

  FIG. 3 is an enlarged view of a main part showing a second embodiment of the semi-floating wheel bearing device according to the present invention. Note that only the pulsar ring configuration is different from the above-described embodiment, and the same reference numerals are assigned to the same parts and the same parts, and detailed description thereof is omitted.

  The pulsar ring 25 includes a metal core 18, an encoder 19, and a seal lip 26 that is vulcanized and bonded to the upright plate portion 18 b of the metal core 18. Since the seal lip 26 has a side lip structure that comes into sliding contact with the inner wall of the upright plate portion 11c of the protective cover 11, it can be brought into sliding contact with the upright plate portion 11c with a slight contact pressure, and the wear powder is caught. It has high durability. The synergistic action of the seal lip 26 and the labyrinth seal R can surely prevent the lubricating oil from entering the bearing from the differential.

  FIG. 4 is an enlarged view of a main part showing a third embodiment of the semi-floating wheel bearing device according to the present invention. Note that the first embodiment (FIG. 2) differs from the first embodiment only in the configuration of the protective cover, and other detailed descriptions of the same parts and the same parts are omitted.

  The protective cover 27 includes a cylindrical mounting portion 11a, a cylindrical portion 11b extending in the axial direction from the mounting portion 11a, a standing plate portion 11d extending radially inward from the cylindrical portion 11b, and the standing plate portion 11d. The seal lip 28 is vulcanized and bonded. The seal lip 28 is made of an elastic member such as nitrile rubber, and constitutes a side lip and is in sliding contact with the end face of the inner ring 4 with a slight contact pressure.

  Here, the seal lip 28 is not limited to an elastic member such as nitrile rubber, but may be a filter seal having a predetermined mesh structure, for example. With such a filter seal, it is possible to effectively prevent the wear powder mixed in the lubricating oil of the differential device from entering the bearing, and only the lubricating oil can be taken into the bearing. Thereby, the seal lip 17b of the seal member 17 mounted inside can be lubricated to suppress lip wear.

FIG. 5 is an enlarged view of a main part showing the fourth embodiment, which is a modification of the third embodiment.
An annular groove 30 is formed on the end surface of the inner ring 29 with which the seal lip 28 comes into sliding contact. Thereby, it is possible to further prevent foreign matters such as abrasion powder mixed in the lubricating oil of the differential device from entering the bearing.

  FIG. 6 is an enlarged view of a main part showing a fifth embodiment of the bearing device for a semi-floating wheel according to the present invention. It should be noted that the difference from the above-described embodiment is only the structure of the seal, and the same parts and the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  The protective cover 31 includes a cylindrical mounting portion 11a, a cylindrical portion 11b extending in the axial direction from the mounting portion 11a, and a standing plate portion 11c extending inward in the radial direction from the cylindrical portion 11b. A stepped portion 32 is formed at the end of the inner ring 4, and the tip of the upright plate portion 11 c of the protective cover 31 is engaged through a slight labyrinth clearance. Thus, the labyrinth seal R can effectively prevent foreign matters such as wear powder mixed in the lubricating oil of the differential device from entering the bearing.

FIG. 7 is an enlarged view of a main part showing the sixth embodiment, which is a modification of the fifth embodiment.
The protective cover 33 includes a cylindrical mounting portion 11a, a cylindrical portion 11b extending in the axial direction from the mounting portion 11a, and a standing plate portion 11c extending radially inward from the cylindrical portion 11b. The front end of the shaft is bent toward the bearing, and an engaging portion 34 is formed. On the other hand, an annular groove 36 is formed on the end surface of the inner ring 35, and the engaging portion 34 of the upright plate portion 11c is engaged through a slight labyrinth clearance to constitute a labyrinth seal R. Thereby, it is possible to further prevent foreign matters such as abrasion powder mixed in the lubricating oil of the differential device from entering the bearing.

  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 according to the present invention can be applied to a semi-floating type wheel bearing device on the side of a driving wheel in which wheel bearings are mounted at openings of a driving shaft and an axle tube.

1 is a longitudinal sectional view showing a first embodiment of a semi-floating wheel bearing device according to the present invention. It is a principal part enlarged view same as the above. It is a principal part enlarged view which shows 2nd Embodiment of the bearing apparatus for semi-floating type wheels which concerns on this invention. It is a principal part enlarged view which shows 3rd Embodiment of the bearing apparatus for semi-floating type wheels which concerns on this invention. FIG. 9 is an enlarged view of a main part showing a fourth embodiment of a semi-floating wheel bearing device according to the present invention, which is a modification of the third embodiment shown in FIG. 4. It is a principal part enlarged view which shows 5th Embodiment of the bearing apparatus for semi-floating type wheels which concerns on this invention. It is a principal part enlarged view which shows 6th Embodiment of the bearing apparatus for semi-floating type wheels which concerns on this invention, and is a modification of 5th Embodiment shown in FIG. It is principal part sectional drawing which shows the conventional rolling bearing for wheels. It is principal part sectional drawing which shows the other conventional rolling bearing for wheels.

Explanation of symbols

1. Outer member 1a ... Outer rolling surface 1b ... ..... Flange for positioning 2 ..... Inner members 3, 4, 29, 35 ..... Inner rings 3a, 4a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Cage 7 ... Hub wheel 7a ... Small diameter step 8 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outboard side sealing device 10 ・ ・ ・ ・ ・ ・ ・ ・ In Board side sealing device 11, 27, 31, 33 ... protective cover 11a ...・ Mounting part 11b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder part 11c, 11d ・ ・ ・ ・ ・ ・ Standing plate part 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Seal 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnet 14, 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pulsar ring 15 and 23 ・ ・ ・ ・ ・ ・ ・ ・・ ・ O-rings 17a, 17b, 26, 28 ・ Seal lips 16, 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 17 ・ ・ ・ ・ ・ ・ ・ ・ Seal member 17c ..... garter spring 18a ..... cylindrical part 18b ....... stand plate Part 18c ... holding part 19 ... encoder 20 ...・ Detection sensor 20a・ ・ ・ Detecting part 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stopping bracket 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bolt 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・···················································································· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 ·········································································· 2・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 65a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side Lip 65b, 65c ... Radial lip 66 ... ... Labyrinth clearance 67, 75 ... Detection sensor 71 ... Pulse generation ring 71a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding plate 71b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 72 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover member 74 ・ ・・ ・ ・ ・ ・ ・ ・ ・ Seal lip B ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Brake rotor D / S ・ ・ ・ ・ ・ ・ ・ ・・ Drive shaft H ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Housing N ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut W ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ R wheel ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal

Claims (9)

A hub wheel integrally having a wheel mounting flange at an end portion on the outboard side, a hub wheel formed with a small diameter step portion extending in the axial direction from the wheel mounting flange, and fitted into the small diameter step portion, at least in a double row on the outer periphery. An inner member composed of an inner ring formed with one inner rolling surface of the inner rolling surfaces, and a double row outer rolling surface mounted on a fixed member and facing the inner rolling surface on the inner periphery. A formed outer member; a double row rolling element housed between the outer member and the inner member; and a sealing device for sealing an annular space between the outer member and the inner member. Rolling wheel bearings
Among the sealing devices, the sealing device on the inboard side has a radial lip that is slidably in contact with the outer diameter of the end of the inner ring on the rotation side, with one end mounted on the outer diameter end of the outer member on the fixed side. The outer ring is attached to the outer diameter of the end of the inner ring on the outer side of the bearing and is formed in a substantially U-shaped cross section, and magnetic powder is mixed into the holding part on the outer diameter side. And a pulsar ring to which encoders having magnetic poles alternately formed in the circumferential direction are joined, and one end portion is attached to the outer member on the outer side of the bearing with respect to the pulsar ring, and the other end portion is connected to the inner side. And a protective cover having a substantially L-shaped cross section made of a non-magnetic material. The detection sensor mounted on the fixed member is opposed to the encoder through the protective cover. A car characterized by detecting the number of revolutions Use rolling bearing.   The wheel rolling bearing according to claim 1, wherein a magnet is joined to the other end of the protective cover.   The wheel according to claim 1 or 2, wherein the seal between the protective cover and the inner member is a labyrinth seal in which the other end of the protective cover is opposed to the inner member through a slight gap. Rolling bearing for use.   The wheel rolling bearing according to claim 3, wherein an annular groove is formed on an end face of the inner ring, and the other end of the protective cover is engaged with the annular groove through a slight labyrinth clearance.   The seal between the protective cover and the inward member is configured such that a side lip is provided on one of the pulsar ring and the protective cover, and the side lip is slidably contacted with the other. Rolling bearing for wheel as described.   3. The seal between the protective cover and the inner member is configured such that a side lip is provided at the other end of the protective cover, and the side lip is brought into sliding contact with the end surface of the inner ring. Rolling bearings for wheels.   The wheel rolling bearing according to claim 6, wherein an annular groove is formed on an end surface of the inner ring, and the side lip is slidably contacted with the annular groove.   The rolling bearing for a wheel according to any one of claims 5 to 7, wherein the side lip is configured by a filter seal having a predetermined mesh structure.   9. The axle tube supported on the lower surface of the vehicle body, a drive shaft inserted inward of the axle tube, and the drive shaft and an opening portion of the axle tube according to claim 1. A semi-floating wheel bearing device, wherein a wheel rolling bearing is mounted, and the drive shaft and the inner member are coupled to transmit torque.

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