JP5415748B2 - Wheel bearing device with rotation speed detector - Google Patents

Description

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

  Rotation speed detection device with built-in rotation speed detection device for detecting the rotation speed of the vehicle and controlling the anti-lock brake system (ABS) while supporting the wheel of the automobile to the suspension system. Wheel bearing devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. It is integrated with. A rotational speed sensor that is arranged facing this magnetic encoder and detects a change in magnetic pole of the magnetic encoder accompanying the rotation of the wheel is mounted on the knuckle after the wheel bearing device is mounted on the knuckle constituting the suspension device. .

  A structure as shown in FIG. 16 is known as an example of such a wheel bearing device with a rotational speed detection device. The wheel bearing device with a rotational speed detection device includes an outer member 50, an inner member 51, and a plurality of balls 52 accommodated between the outer member 50 and the inner member 51. The inner member 51 includes a hub ring 53 and an inner ring 54 press-fitted into the hub ring 53.

  The outer member 50 integrally has a vehicle body mounting flange 50b fixed to the knuckle 65 constituting the suspension device on the outer periphery, and double row outer rolling surfaces 50a and 50a are integrally formed on the inner periphery. A sensor 63 is supported and fixed to the knuckle 65 by a screw 66.

  The hub wheel 53 integrally has a wheel mounting flange 55 for mounting a wheel (not shown) at one end, an inner rolling surface 53a on the outer periphery, and a small diameter step extending in the axial direction from the inner rolling surface 53a. A portion 53b is formed. The inner ring 54 has an inner rolling surface 54a formed on the outer periphery, and is fixed in the axial direction by a caulking portion 53c formed by plastically deforming an end portion of the small diameter step portion 53b.

  A seal ring 56 is fitted and fixed to the outer end portion of the outer member 50, and the lip of the seal ring 56 is in sliding contact with the base portion 55 a of the wheel mounting flange 55. On the other hand, an encoder 57 is fitted and fixed to the outer peripheral surface of the inner end portion of the inner ring 54. The encoder 57 includes a support ring 58 having an L-shaped cross section, and an annular encoder body 59 attached and supported on the side surface of the support ring 58 over the entire circumference. In the encoder body 59, magnetic poles N and S are alternately magnetized at equal intervals in the circumferential direction.

  The inner end opening of the outer member 50 is closed by the cover 60. The cover 60 is formed in a petri dish from a nonmagnetic plate material such as a non-magnetic stainless steel plate, an aluminum alloy plate, or a high-functional resin, and has a circular closing plate portion 61 and an outer peripheral edge portion of the closing plate portion 61. And a cylindrical fitting portion 62 formed in the above.

The side surface of the encoder main body 59 that constitutes the encoder 57 is disposed in close proximity to the cover 60, and the detection unit 64 of the sensor 63 is in proximity to or in contact with the side surface of the cover 60. Are opposed to each other through a cover 60. Thereby, the presence of the cover 60 can prevent water, iron powder, magnetic fragments, etc. from entering between the sensor 63 and the encoder 57, thereby preventing the sensor 63 and the encoder 57 from being damaged. It is possible to prevent the regular and periodic magnetic property changes of the main body 59 from being disturbed or deteriorated.
JP 2000-249138 A

  However, such a conventional wheel bearing device with a rotational speed detection device has the following problems. First, the positioning of the cover 60 with respect to the outer member 50 is unstable. When the cover 60 is mounted, the bearing alone is transported, assembled to a vehicle, or mounted on wheels, the cover 60 is moved to a specified position by a stepping stone or the like. There is a risk of dislodging.

  Further, since the shape of the cover 60 is a simple U-shaped cross section, the rigidity is insufficient, and the cover 60 may be deformed by contact with a flying stone or the like, and may come into contact with the encoder main body 59. Furthermore, since the detection unit 64 of the sensor 63 faces the encoder 57 via the cover 60, the air gap may increase and the detection accuracy may decrease.

  The present invention has been made in view of such circumstances, and protects and protects the magnetic encoder from the outside of the bearing with a protective cover, and also increases the rigidity of the protective cover to suppress deformation, thereby providing reliable rotation speed detection. An object of the present invention is to provide a wheel bearing device with a rotational speed detection device with improved performance.

In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel attachment for attaching a wheel to one end. The hub ring has a flange integrally formed with a small diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small diameter step portion of the hub ring. An inner member in which a double-row inner rolling surface facing the running surface is formed, and a double-row rolling element that is movably accommodated between the inner and outer members. And a magnetic encoder externally fitted to the inner ring, a seal is attached to the outer end of the outer member, and a protective cover is attached to the inner end of the outer member, annular openings formed between the outer member and the inner member is sealed, prior to In the magnetic encoder and the sensor is arranged opposite the rotating speed detector equipped wheel support bearing assembly through the protective cover, wherein the caulking portion formed by plastically deforming the end of the cylindrical portion of the hub wheel, a predetermined While the bearing preload is applied, the inner ring is fixed in the axial direction with respect to the hub ring, and the protective cover is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate, and the outer ring A cylindrical fitting portion fitted in the outer member, a flange portion that is formed by overlapping the fitting portion radially outward and is in close contact with the end surface on the inner side of the outer member; A disc-shaped shielding portion that extends radially inward from the portion so that the sensor approaches or abuts the side surface on the inner side, and an inner side end portion of the inner member from the shielding portion via an inclined portion. and a bottom portion which closes the front It said recess is formed so as to approach the magnetic encoder shielding portion of the protective cover, wherein the sensor is disposed in a portion of the recess.

As described above, in the wheel bearing device with a rotational speed detection device of the inner ring rotation type in which the magnetic encoder and the sensor are arranged to face each other through the protective cover, the end portion of the small diameter step portion of the hub wheel is formed by plastic deformation. The inner ring is fixed to the hub ring in the axial direction with a predetermined bearing preload applied by the tightening portion, and the protective cover is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate. A cylindrical fitting portion that is fitted in the outer member, a flange portion that is formed by once overlapping radially outward from the fitting portion, and that is in close contact with the inner side end surface of the outer member, A disc-shaped shielding portion that extends radially inward from the flange portion and in which the sensor approaches or comes into contact with the side surface on the inner side, and an inner side end portion of the inner member from the shielding portion via an inclined portion. and a bottom portion which closes the protective cover A recess in the shielding unit so as to approach the magnetic encoder forms, the sensor at the site of the recess is disposed, the rigidity of the protective cover by stepped shape including polymerized flange portion is increased, scattering stones or the like Can be prevented from being deformed, and the flange is press-fitted until it comes into close contact with the inner end face of the outer member, so that the positioning accuracy of the protective cover with respect to the outer member can be increased, and accurate air gap adjustment Reliable speed detection can be performed.

  Preferably, if the stepped portion that bulges into the recess of the crimping portion is formed at the center of the bottom portion of the protective cover as in the invention described in claim 2, the rigidity of the protective cover is further increased. It becomes high and can suppress deformation due to stepping stones.

  More preferably, as in the invention described in claim 3, if the stepped portion is formed in a substantially rectangular cross section along the shape of the recess of the crimped portion, the rigidity of the protective cover is further increased. Get higher.

  According to a fourth aspect of the present invention, the detection surface of the magnetic encoder is disposed so as to protrude from the inner end surface of the outer member by a, and the protrusion amount a is the thickness of the protective cover. If it is set to be smaller than t (a <t), the protective cover can be prevented from coming into contact with the inner ring, the air gap can be set small, and the detection accuracy can be increased.

Further, as in the invention described in claim 5 , if the proximity amount c of the concave portion is set smaller than the thickness b of the flange portion of the protective cover (c <b), the protective cover comes into contact with the inner ring. In addition, the rigidity of the protective cover can be increased, and the flying stones can collide with the protective cover to prevent deformation, and the air gap can be set small.

Preferably, as in the invention described in claim 6 , if the concave portion is formed in an eyebrow shape, even if there is an error in the positioning accuracy in the circumferential direction of the protective cover with respect to the sensor, it can be tolerated.

Further, as in the seventh aspect of the invention, if the elastic member is integrally joined to the flange portion of the protective cover by vulcanization adhesion and elastically contacts the inner side end surface of the outer member, The airtightness of the fitting portion of the protective cover with respect to the side member is improved, and it is possible to reliably prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside.

Further, as in the eighth aspect of the invention, an elastic member is integrally joined to the front end of the fitting portion of the protective cover by vulcanization adhesion, and is press-fitted or elastically fitted to the inner periphery of the inner side end of the outer member. If contact is made, the tightness of the fitting part of the protective cover to the outer member will improve, and it will be possible to prevent leakage of the lubricating grease sealed inside the bearing and rainwater and dust from entering the bearing from the outside. Can be prevented.

Further, as in the invention according to claim 9 , if the adhesive used at the time of vulcanization adhesion of the elastic member is applied to the entire protective cover or the fitting portion with the outer member, the outer member Therefore, the airtightness of the fitting portion of the protective cover can be improved.

The wheel bearing device with a rotational speed detection device according to the present invention is integrally formed with an outer member in which a double row outer rolling surface is integrally formed on the inner periphery and a wheel mounting flange for mounting a wheel on one end. A hub ring having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, and facing the outer surface of the double row on the outer periphery. An inner member in which a double-row inner rolling surface is formed, a double-row rolling element housed between the inner member and the outer member so as to roll freely, and the inner ring A magnetic encoder externally fitted to the outer member, and a seal is attached to an outer end of the outer member, and a protective cover is attached to an inner end of the outer member. When the opening of the annular space formed between the inner member is sealed, the protective In the magnetic encoder and the sensor is arranged opposite the rotating speed detector equipped wheel support bearing assembly through the bar, the crimp portion formed by plastically deforming the end of the cylindrical portion of the hub wheel, a predetermined bearing The inner ring is fixed in the axial direction with respect to the hub ring in a state where a preload is applied, and the protective cover is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate, and the outer ring A cylindrical fitting portion that is fitted inside the member, a flange portion that is formed by once overlapping radially outward from the fitting portion, and that is in close contact with the inner end surface of the outer member, and the flange portion A disc-shaped shielding portion extending inward in the radial direction from which the sensor approaches or comes into contact with the side surface on the inner side, and the inner side end portion of the inner member from the shielding portion through the inclined portion. and a bottom portion, the protection Recess is formed in proximity to the magnetic encoder to the shield portion of the bar, since the sensor portion of the recess is disposed, the rigidity of the protective cover by stepped shape including polymerized flange portion is increased In addition to being able to suppress deformation due to flying stones and the like, and press-fitting until the collar portion comes into close contact with the inner side end face of the outer member, the positioning accuracy of the protective cover relative to the outer member can be increased, and accurate air Reliable speed detection can be performed by adjusting the gap.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and having one inner rolling surface opposed to the double-row outer rolling surface on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring that is press-fitted into the small-diameter step portion and formed with the other inner rolling surface opposite to the double row outer rolling surface, and the inner member and the outer member. A double row rolling element housed between the running surfaces so as to be freely rollable, and a magnetic encoder externally fitted to the inner ring, and a seal is attached to the outer end of the outer member, and A protective cover is attached to the inner side end of the outer member, and the outer member In the wheel bearing device with a rotational speed detection device in which the opening of the annular space formed by the inner member is sealed, by the crimping portion formed by plastically deforming the end portion of the small diameter step portion of the hub wheel, The inner ring is axially fixed to the hub ring in a state where a predetermined bearing preload is applied, and the protective cover is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate, A cylindrical fitting portion fitted into the outer member, a flange portion that is formed by once overlapping radially outward from the fitting portion, and is in close contact with the inner end face of the outer member; A disk-shaped shielding part extending inward in the radial direction from the flange part and in which the sensor is close to or abutting on the inner side surface, and an inner side end of the inner member from the shielding part via an inclined part At the bottom of the bottom and the center of this bottom A stepped portion that bulges into the recess of the crimping portion, and a recess is formed in the shielding portion of the protective cover so as to be close to the magnetic encoder, and the detection surface of the magnetic encoder is the outer member The protrusion a is projected by a from the inner end face of the cover, and when the plate thickness of the protective cover is t, this protrusion amount a is determined from the thickness b of the flange portion of the protective cover and the proximity c of the recess. A range smaller than the value obtained by subtracting the thickness t (a <bct) is set.

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, and FIG. 2 is an enlarged view of a main part showing a detection unit 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 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 detecting device is for a driven wheel called a third generation, and is housed between the inner member 1, the outer member 2, and both the members 1 and 2 so as to roll freely. Double-row rolling elements (balls) 3 and 3 are provided. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The outer member 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 2b for mounting to a knuckle (not shown) on the outer periphery. Double row outer rolling surfaces 2a, 2a are integrally formed. These double-row outer raceway surfaces 2a and 2a are formed with a hardened layer having a surface hardness of 58 to 64 HRC by induction hardening.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and hub bolts 6a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Moreover, the inner side rolling surface 4a which opposes one (outer side) of the said double row outer side rolling surface 2a, 2a and the small diameter step part 4b extended in an axial direction from this inner side rolling surface 4a are formed in outer periphery. Yes. On the other hand, the inner ring 5 is formed on the outer periphery with an inner rolling surface 5a facing the other (inner side) of the double row outer rolling surfaces 2a, 2a, and a small-diameter step portion 4b of the hub wheel 4 via a predetermined shimoshiro. It is press-fitted. The inner ring 5 is fixed in the axial direction in a state where a predetermined bearing preload is applied by a crimping portion 7 formed by plastically deforming an end portion of the small-diameter stepped portion 4b of the hub wheel 4 radially outward. .

  Between the double row outer rolling surfaces 2a, 2a of the outer member 2 and the double row inner rolling surfaces 4a, 5a facing these, the double row rolling elements 3, 3 are respectively accommodated, and the cage 8 , 8 are held so as to roll freely. A seal 9 is attached to the outer opening of the annular space formed between the outer member 2 and the inner member 1, and a protective cover 10 is attached to the inner opening. This prevents leakage of the lubricating grease sealed inside the bearing and prevents rainwater and dust from entering the bearing from the outside. In addition, although the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, not only this but the double row tapered roller bearing which uses the tapered roller for the rolling element 3 may be sufficient. In addition, here, a third generation structure in which the inner rolling surface 4a is formed directly on the outer periphery of the hub wheel 4 is illustrated, but although not shown, a pair of inner rings are press-fitted and fixed to the small-diameter step portion of the hub wheel. It may be a first generation or second generation structure.

  The hub wheel 4 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 4a to the base 6b on the inner side of the wheel mounting flange 6 to the small diameter step 4b. The surface is hardened by induction hardening in the range of 58 to 64 HRC. In addition, the crimping part 7 is made into the surface hardness after a forge process. This facilitates the caulking process, prevents the occurrence of microcracks during the process, improves not only the wear resistance of the base part 6b serving as the seal land part of the seal 9, but also loads the wheel mounting flange 6. Therefore, the durability of the hub wheel 4 is improved. The inner ring 5 and the rolling element 3 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching.

  The seal 9 is an integrated seal composed of a core metal 11 press-fitted into the inner periphery of the outer side end portion of the outer member 2 through a predetermined shimiro and a seal member 12 joined to the core metal 11. It is configured. The core metal 11 is formed by pressing a cold-rolled steel plate (JIS standard SPCC system or the like).

  On the other hand, the sealing member 12 is made of synthetic rubber such as nitrile rubber and is integrally joined to the core metal 11 by vulcanization adhesion. This seal member 12 is formed to be inclined outward in the radial direction, and is provided with a side lip 12a that is in sliding contact with a side surface on the inner side of the wheel mounting flange 6 with a predetermined squeeze, and a base 6b that is formed with a circular cross section. A radial lip 12b that is slidably contacted with the squeeze and a grease lip 12c that is inclined toward the inner side of the bearing.

  A support ring 13 having an L-shaped cross section is fitted on the inner ring 5. 2, the support ring 13 includes a cylindrical portion 13a that is press-fitted into the outer diameter of the inner ring 5, and a vertical plate portion 13b that extends radially outward from the cylindrical portion 13a. The magnetic encoder 14 is integrally joined to the side surface of the plate portion 13b by vulcanization adhesion or the like. In the magnetic encoder 14, magnetic powder such as ferrite is mixed in synthetic rubber, and magnetic poles N and S are magnetized alternately at equal pitches in the circumferential direction.

  The support ring 13 is pressed from 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 processing. As a result, it is possible to prevent the support ring 13 from rusting and to increase the magnetic output of the magnetic encoder 14 to ensure stable detection accuracy.

  The protective cover 10 attached to the inner side end of the outer member 2 is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate (JIS standard SUS304). A cylindrical fitting portion 10a that is press-fitted into the inner periphery of the end portion, and a flange portion 10b that is formed by overlapping from the fitting portion 10a radially outward and is in close contact with the end surface 2c on the inner side of the outer member 2. And a disc-shaped shielding portion 10c extending radially inward from the flange portion 10b, and a bottom portion 10e for closing the inner side end of the inner member 1 from the shielding portion 10c via the inclined portion 10d. ing. A stepped portion 10f that bulges in the recess 7a of the caulking portion 7 is formed at the center of the bottom portion 10e (see FIG. 1). The detection unit of the sensor (not shown) is brought close to or in contact with the shielding unit 10c of the protective cover 10, and the detection unit and the magnetic encoder 14 are arranged to face each other with a predetermined air gap (axial clearance) through the protective cover 10. Has been. In addition, since the protective cover 10 is a non-magnetic material, it does not affect the flow path of the magnetic flux, and there is no problem of a decrease in accuracy of rotation speed detection by the sensor.

  In the present embodiment, the rigidity of the protective cover 10 is increased by the stepped shape including the polymerized collar part 10b, and deformation due to flying stones can be suppressed, and the collar part 10b is an end face on the inner side of the outer member 2. Since it press-fits until it comes into close contact with 2c, the positioning accuracy of the protective cover 10 with respect to the outer member 2 can be increased, and highly reliable speed detection can be performed by accurate air gap adjustment.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 4 is an enlarged view of a main part showing the detection unit of FIG. Note that this embodiment is basically different from the above-described embodiment only in the configuration of the protective cover, and the other parts having the same parts or the same functions as those of the above-described embodiment are denoted by the same reference numerals. Detailed description thereof is omitted.

  A protective cover 15 is attached to the inner end of the outer member 2. The protective cover 15 is formed into a cup shape by press working from a non-magnetic austenitic stainless steel plate (JIS standard SUS304 type), and is a cylindrical fitting portion that is press-fitted into the inner periphery of the end of the outer member 2. 10a, a flange portion 10b closely contacting the inner end face 2c of the outer member 2, a disk-shaped shielding portion 15a extending radially inward from the flange portion 10b, and an inclined portion 10d from the shielding portion 15a. And a bottom portion 10e that closes an end portion of the inner member 1 on the inner side.

  In the present embodiment, as shown in FIG. 4, the large end surface 5 b of the inner ring 5 is formed so as to protrude from the inner side end surface 2 c of the outer member 2 to the inner side by a predetermined step L <b> 1 and the magnetic encoder 14. The detection surface is disposed so as to protrude by a from the inner side end surface 2 c of the outer member 2. This protrusion amount a is set to be larger than the step L1 of the inner ring 5 and smaller than the plate thickness t of the protective cover 15 (L1 <a <t). As a result, the protective cover 15 can be prevented from coming into contact with the inner ring 5, and the air gap can be set small, so that the detection accuracy can be increased. And the step part 15b which bulges in the recess 7a of the crimping part 7 is formed in the center part of this bottom part 10e. Since the stepped portion 15b is formed in a substantially rectangular cross section along the shape of the recess 7a of the crimping portion 7, the rigidity of the protective cover 15 is further increased.

  Further, in the present embodiment, the thickness of the protective cover 15 is made thinner than the usual 0.8 mm by 0.4 to 0.00 because the rigidity of the protective cover 10 is increased by the stepped shape including the superposed flange portion 10b. A range of 8 mm can be set. As a result, the protective cover 15 can be easily pressed, the processing accuracy can be improved, and the air gap can be set smaller.

  FIG. 5 is a longitudinal sectional view showing a third embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, FIG. 6 is an enlarged view of a main part showing the detection unit of FIG. 5, and FIG. FIG. 6 is a view taken along arrow VII. This embodiment is basically the same as the first embodiment (FIG. 1) described above except that the configuration of the protective cover is different, and the other parts are the same parts or the same function as the previous embodiment. Are given the same reference numerals and their detailed description is omitted.

  A protective cover 16 is attached to the inner side end of the outer member 2. The protective cover 16 is formed in a cup shape by press working from a non-magnetic austenitic stainless steel plate (JIS standard SUS304 type) and is press-fitted into the inner periphery of the end of the outer member 2. 10a, a flange portion 10b closely contacting the inner end face 2c of the outer member 2, a disk-shaped shield portion 16a extending radially inward from the flange portion 10b, and an inclined portion 10d from the shield portion 16a. And a bottom portion 10e that closes an end portion of the inner member 1 on the inner side.

  In the present embodiment, as shown in FIG. 7, an eyebrow-shaped recess 17 is formed in the shielding portion 16 a of the protective cover 16 so as to be close to the magnetic encoder 14 by c. A sensor (not shown) is brought close to or brought into contact with the concave portion 17. As a result, the rigidity of the protective cover 16 is further increased, and by forming the concave portion 17 into an eyebrow shape, even if there is an error in the positioning accuracy in the circumferential direction of the protective cover 16 with respect to the sensor, it can be allowed.

  Further, as shown in FIG. 6, the large end surface 5 b of the inner ring 5 is formed flush with the inner side end surface 2 c of the outer member 2, and the detection surface of the magnetic encoder 14 is on the inner side of the outer member 2. It protrudes from the end face 2c by a. This protrusion amount a is set to a range smaller than a value obtained by subtracting the proximity amount c of the recess 17 and the plate thickness t from the thickness b of the flange portion 10b of the protective cover 16 when the plate thickness of the protective cover 16 is t. (A <b-ct). This increases the rigidity of the protective cover 16 while preventing the protective cover 16 from coming into contact with the inner ring 5, so that the stepping stones can collide with the protective cover 16 to prevent deformation, and the air gap is set small. This can increase the detection accuracy.

  FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 9 is an enlarged view of a main part showing the detection unit of FIG. This embodiment is basically the same as the first embodiment (FIG. 1) described above except that the configuration of the protective cover is different, and the other parts are the same parts or the same function as the previous embodiment. Are given the same reference numerals and their detailed description is omitted.

  A protective cover 18 is attached to the inner end of the outer member 2. The protective cover 18 is formed into a cup shape by press working from a non-magnetic austenitic stainless steel plate (JIS standard SUS304 type), and is a cylindrical fitting portion that is press-fitted into the inner periphery of the end of the outer member 2. 10a, a flange portion 10b closely contacting the inner end face 2c of the outer member 2, a disk-shaped shield portion 10c extending radially inward from the flange portion 10b, and an inclined portion 10d from the shield portion 10c. And a bottom portion 10e that closes an end portion of the inner member 1 on the inner side.

  In the present embodiment, as shown in FIG. 9, the large end surface 5 b of the inner ring 5 is formed so as to protrude from the inner side end surface 2 c of the outer member 2 by a predetermined step L <b> 2 toward the inner side. The step L2 is set to be larger than the plate thickness t of the protective cover 18 and smaller than the thickness b of the flange portion 10b (t <L2 <b). Further, the detection surface of the magnetic encoder 14 is disposed so as to protrude by a from the inner end surface 2 c of the outer member 2. This protrusion amount a is set smaller than the plate thickness t of the protective cover 18 (a <t). A seal lip 19 made of synthetic rubber such as nitrile rubber is integrally joined to the flange portion 10b by vulcanization adhesion, and is in elastic contact with the inner end face of the outer member 2. As a result, the rigidity of the protective cover 18 can be increased, and stepping stones can collide with the protective cover 18 to prevent deformation, and the airtightness of the fitting portion of the protective cover 18 with respect to the outer member 2 is improved. It is possible to reliably prevent leakage of the lubricating grease enclosed in the bearing and intrusion of rainwater, dust and the like into the bearing from the outside.

  As described above, the seal lip 19 is joined to the flange portion 10b of the protective cover 18 to improve the airtightness, and an adhesive used for vulcanization bonding such as a seal is applied to the entire protective cover 18 or the outer member 2. The airtightness can be improved by applying the adhesive to the entire protective cover 18 or the fitting portion with the outer member 2 without bonding the seal lip 19 to the fitting portion. .

  FIG. 10 is a longitudinal sectional view showing a fifth embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, FIG. 11 is an enlarged view of a main part showing the detection unit of FIG. 10, and FIG. It is a principal part enlarged view which shows the 11 modifications. This embodiment is basically the same as the first embodiment (FIG. 1) described above except that the configuration of the protective cover is different, and the other parts are the same parts or the same function as the previous embodiment. Are given the same reference numerals and their detailed description is omitted.

  A protective cover 20 is attached to the inner end of the outer member 2. This protective cover 20 is formed in a cup shape by press working from a non-magnetic austenitic stainless steel plate (JIS standard SUS304 series), and is a cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member 2. 20a, a flange portion 10b closely contacting the inner end face 2c of the outer member 2, a disk-shaped shielding portion 10c extending radially inward from the flange portion 10b, and an inclined portion 10d from the shielding portion 10c. And a bottom portion 10e that closes an end portion of the inner member 1 on the inner side.

  In the present embodiment, as shown in FIG. 11, the large end surface 5 b of the inner ring 5 is formed so as to protrude from the inner side end surface 2 c of the outer member 2 to the inner side by a predetermined step L <b> 2, and the magnetic encoder 14. The detection surface is disposed so as to protrude by a from the inner side end surface 2 c of the outer member 2. An elastic member 21 made of synthetic rubber such as nitrile rubber is integrally joined to the tip of the fitting portion 20a by vulcanization adhesion, and is press-fitted into the inner periphery of the inner side end of the outer member 2. As a result, the airtightness of the fitting portion of the protective cover 20 with respect to the outer member 2 is improved, and it is ensured that the lubricating grease sealed in the bearing is leaked and that rainwater, dust, etc. enter the bearing from the outside. Can be prevented.

  As shown in FIG. 12, a seal lip 22 made of synthetic rubber such as nitrile rubber is integrally joined to the tip of the fitting portion 20b by vulcanization adhesion, and elastically applied to the inner periphery of the inner side end of the outer member 2. You may make it contact. As a result, the airtightness of the fitting portion of the protective cover 20 ′ with respect to the outer member 2 is improved, the press-fitting work of the protective cover 20 ′ is facilitated, and the seal lip 22 can be prevented from being lost during the press-fitting. it can.

13 is a longitudinal sectional view showing a reference example of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 14 is an enlarged view of a main part showing a detection unit of FIG. 13, and FIG. 15 is an XV of FIG. It is an arrow view. This embodiment is basically the same as the first embodiment (FIG. 1) described above except that the configuration of the protective cover is different, and the other parts are the same parts or the same function as the previous embodiment. Are given the same reference numerals and their detailed description is omitted.

  A protective cover 23 is attached to the inner side end of the outer member 2. The protective cover 23 is formed in a cup shape by press working from SPCC, SPCD, SPCE of a cold rolled steel plate (JIS G 3141 of JIS standard). Of these, SPCD and SPCE with improved drawability are preferred. The protective cover 23 includes a cylindrical fitting portion 10a that is press-fitted into the inner periphery of the end portion of the outer member 2, a flange portion 10b that is in close contact with the inner end surface 2c of the outer member 2, and a diameter from the flange portion 10b. A disc-shaped shielding portion 23a extending inward in the direction and a bottom portion 10e that closes the inner side end of the inner member 1 from the shielding portion 23a via the inclined portion 10d.

  In the present embodiment, as shown in FIG. 15, eyebrows-shaped through holes 24 are formed in the shielding portion 23 a of the protective cover 23, and an elastic member 25 made of synthetic rubber such as nitrile rubber so as to close the through holes 24. Are joined together by vulcanization adhesion. That is, as shown in FIG. 14, the magnetic encoder 14 and a sensor (not shown) are disposed to face each other via the elastic member 25. Accordingly, even if there is an error in the positioning accuracy in the circumferential direction and the axial direction of the protective cover 23 with respect to the sensor, it is possible to ensure the desired detection accuracy and as in the above-described embodiment. Even without using expensive stainless steel, a cold-rolled steel plate with improved deep drawability can be used, and the cost can be reduced.

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

  The wheel bearing device with a rotational speed detection device according to the present invention can be applied to a wheel bearing device having a first to third generation structure having an inner ring rotating 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 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 detection part of FIG. It is a longitudinal cross-sectional view which shows 3rd 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 detection part of FIG. It is a VII arrow line view of FIG. It is a longitudinal cross-sectional view which shows 4th 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 detection part of FIG. It is a longitudinal cross-sectional view which shows 5th 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 detection part of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a longitudinal cross-sectional view which shows the reference example 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 detection part of FIG. It is a XV arrow line view 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 ... Inner member 2 ... Outer member 2a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surface 2b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 2c ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ End face 3 on the inner side ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 4 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 4a, 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 4b ・ ・ ・ ・ ・ ・.... Small diameter step 5 ... Inner ring 5b ...・ ・ ・ Large end face 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub Bob G 6b ..... Base 7 on the inner side ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Recess 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 9 ......... Outer seals 10, 15, 16, 18, 20, 20 ', 23 ・ Protective covers 10a, 20a, 20b ...・ Fitting part 10b .............. collar part 10c, 15a, 16a, 23a ........ shielding part 10d ........・ ・ ・ ・ ・ ・ ・ ・ ・ Inclined part 10e ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bottom part 10f, 15b ・ ・ ・ ・ ・ ・ ・ ・ ・ Stepped Part 11 ... Core 12 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 12a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 12b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Radial lip 12c ... Grease lip 13 ... Support ring 13a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 13b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate part 14 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Recesses 19 and 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Seal lips 21, 25 ..... Elastic member 24 ..... Through hole 50. ..... Outer member 50a ... Outer rolling surface 50b ... Body mounting flange 51 ...・ ・ ・ ・ ・ ・ Inner member 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Hub wheel 53a, 54a ... Inner rolling surface 53b ... Small diameter step 53c ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fastening part 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 55a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Seal ring 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Support ring 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder body 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Cover 61 ... Closing plate part 62 ... ... Fitting part 63 ··················································.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Screw a ...... Projection amount b of the detection surface of the magnetic encoder b ... Thickness c of the cover cover c ... ················ Close proximity distance L1, L2 ............. thickness of the protective cover

Claims (9)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed movably between the rolling surfaces of the inner member and the outer member;
A magnetic encoder fitted on the inner ring,
An annular space is formed by the outer member and the inner member having a seal attached to the outer end portion of the outer member and a protective cover attached to the inner end portion of the outer member. In the wheel bearing device with a rotational speed detection device in which the opening is sealed and the magnetic encoder and the sensor are arranged to face each other through the protective cover .
The inner ring is fixed in the axial direction with respect to the hub wheel while a predetermined bearing preload is applied by a crimping portion formed by plastically deforming an end portion of the small-diameter step portion of the hub wheel,
The protective cover is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate and is fitted into the outer member, and once radially outward from the fitting portion And a disc-shaped portion that is formed by being polymerized and closely contacts the inner end surface of the outer member, and that extends radially inward from the flange portion so that the sensor approaches or contacts the inner side surface. And a bottom portion that closes the inner side end of the inner member from the shielding portion through an inclined portion, and a concave portion is formed in the shielding portion of the protective cover so as to be close to the magnetic encoder. The wheel bearing device with a rotational speed detecting device is characterized in that the sensor is disposed in the concave portion .   The wheel bearing device with a rotational speed detection device according to claim 1, wherein a stepped portion that bulges into a recess of the caulking portion is formed at a center portion of the bottom portion of the protective cover.   The wheel bearing device with a rotational speed detection device according to claim 2, wherein the stepped portion is formed in a substantially rectangular cross section along the shape of the recess of the caulking portion. The detection surface of the magnetic encoder protrudes from the inner side end surface of the outer member by a, and the protrusion a is set smaller than the plate thickness t of the protective cover (a <t). The wheel bearing apparatus with a rotational speed detection apparatus of Claim 1 . The wheel bearing device with a rotation speed detection device according to claim 1 , wherein the proximity amount c of the concave portion is set smaller than the thickness b of the flange portion of the protective cover (c <b). The wheel bearing device with a rotational speed detection device according to claim 1 or 5 , wherein the concave portion is formed in an eyebrow shape. The wheel bearing device with a rotational speed detection device according to claim 1, wherein an elastic member is integrally joined to the flange portion of the protective cover by vulcanization adhesion, and is elastically contacted to an inner end face of the outer member. The rotational speed detection according to claim 1, wherein an elastic member is integrally joined to a front end of the fitting portion of the protective cover by vulcanization adhesion, and is press-fitted or elastically contacted with an inner periphery of an inner side end of the outer member. Wheel bearing device with device. The wheel bearing device with a rotation speed detecting device according to claim 7 or 8, wherein an adhesive used for vulcanization bonding of the elastic member is applied to the entire protective cover or a fitting portion with the outer member.

Images