JP2012202415A - Wheel bearing device equipped with rotational speed detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device equipped with a rotational speed detection device, in which pulling-out resistance of a protective cover is increased by improving ring rigidity thereof.SOLUTION: A protective cover 10 includes: a cylindrical fitting part 10a press-fitted into an end inner periphery of the inner side of an outer member 2; a discoid shielding part 10b extending radially inward from the fitting part 10a and facing a pulser ring 13 with a slight space in an axial direction; and a bottom part 10d for covering the end of the inner side of an inner member 1 from the shielding part 10b via a bent part 10c. The fitting part 10a is formed of: a cylindrical part 17 metal-fitted in a fitting surface 2c formed in the end inner periphery of the inner side of the outer member 2 and having a plate thickness t1 formed thicker than the plate thickness t0 of the other part; and a diameter reduced part 18 extending from the cylindrical part 17 in the axial direction, wherein an elastic member 19 made of synthetic rubber is integrally coupled to the diameter reduced part 18 by vulcanization adhesion.

Description

  The present invention incorporates a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, in particular, a rotational speed detection device for detecting the rotational speed of the wheel, thereby improving the ring rigidity of the protective cover. The present invention relates to a wheel bearing device with a rotational speed detection device.

  A wheel bearing with a rotation speed detecting device that rotatably supports a vehicle wheel with respect to a suspension device and controls an anti-lock brake system (ABS) to detect the rotation speed of the wheel. Devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. In addition, the rotational speed detecting device is constituted by a magnetic encoder and a rotational speed sensor that is arranged facing the magnetic encoder and detects a magnetic pole change of the magnetic encoder accompanying the rotation of the wheel.

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing for a wheel with a rotational speed detection device that also incorporates the rotational speed sensor in the bearing. A device has been proposed.

  As an example of such a wheel bearing device with a rotational speed detection device, one having a structure as shown in FIG. 10 is known. This wheel bearing device with a rotational speed detection device includes an inner member 51, an outer member 52, and double-row balls 53, 53 accommodated between the members 51, 52 so as to roll freely. The inner member 51 includes a hub ring 54 and an inner ring 55 that is press-fitted into the hub ring 54 through a predetermined shimiro.

  The outer member 52 integrally has a vehicle body mounting flange 52b for mounting to a knuckle (not shown) on the outer periphery, and double row outer rolling surfaces 52a and 52a are integrally formed on the inner periphery. The hub wheel 54 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at an end portion on the outer side, and an inner side facing one of the double-row outer rolling surfaces 52a and 52a on the outer periphery. A rolling surface 54a and a small-diameter step portion 54b extending in the axial direction from the inner rolling surface 54a are formed. On the other hand, the inner ring 55 is formed with an inner rolling surface 55a facing the other of the double row outer rolling surfaces 52a, 52a on the outer periphery, and is press-fitted into the small-diameter step portion 54b of the hub ring 54 through a predetermined shimiro. Yes. And the inner ring | wheel 55 is fixed to the axial direction in the state to which the predetermined bearing preload was provided by the crimping part 57 formed by carrying out the plastic deformation of the edge part of the small diameter step part 54b of the hub ring 54 radially outward. .

  Between the double row outer raceway surfaces 52a, 52a of the outer member 52 and the double row inner raceway surfaces 54a, 55a facing these, double row balls 53, 53 are respectively accommodated, and a cage 58, It is held by 58 so that it can roll freely. In addition, a seal 59 is attached to one of the openings of the annular space formed between the outer member 52 and the inner member 51, and a protective cover 60 is attached to the other opening. This prevents leakage of lubricating grease sealed inside the bearing and intrusion of rainwater and dust into the bearing from the outside.

  A support ring 61 having an L-shaped cross section is fitted on the inner ring 55. A magnetic encoder 62 in which magnetic powder such as ferrite is mixed with synthetic rubber and magnetic poles N and S are alternately magnetized at equal pitches in the circumferential direction is integrally joined to the support ring 61 by vulcanization bonding or the like. ing.

  The protective cover 60 attached to the inner side end of the outer member 52 is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate and is press-fitted into the inner periphery of the end of the outer member 52. A cylindrical fitting portion 60a, a disc-shaped shielding portion 60b extending radially inward from the fitting portion 60a, and an end portion of the inner member 51 are closed from the shielding portion 60b via the inclined portion 60c. And a bottom portion 60d. A stepped portion 60e that bulges into the recess 57a of the caulking portion 57 is formed at the center of the bottom portion 60d. In addition, the detection unit of the sensor (not shown) is brought close to or in contact with the shielding unit 60b of the protective cover 60, and the detection unit and the magnetic encoder 62 are arranged to face each other with a predetermined air gap (axial clearance) through the protective cover 60. Has been.

  As described above, the stepped shape such as the stepped portion 60e including the inclined portion 60c increases the rigidity of the protective cover 60, can suppress deformation due to a collision of flying stones, and the fitting portion 60a is the outer member 52. Since it is press-fitted until it collides with the step portion, the positioning accuracy of the protective cover 60 with respect to the outer member 52 can be increased, and a reliable speed detection can be performed by accurate air gap adjustment (for example, (See Patent Document 1).

JP 2010-106909 A

  In such a conventional wheel bearing device with a rotational speed detection device, the rotational speed sensor is disposed to face the magnetic encoder 62 and a nonmagnetic protective cover 60 with a predetermined air gap (axial clearance). Therefore, the air gap is limited, and the protective cover 60 is restricted to a thin plate. Therefore, the ring rigidity of the fitting portion 60a of the protective cover 60 is insufficient, and the pulling-out strength of the protective cover 60 is reduced. When this pulling-out strength is reduced, the protective cover 60 moves during use, causing strong contact with the rotation speed sensor and causing malfunctions, and the protective cover 60 falls off and the sealing performance cannot be maintained. There was a fear.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a wheel bearing device with a rotational speed detection device that improves the ring rigidity of the protective cover and has increased pulling strength. .

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and a double row outer rolling surface on the inner periphery. A hub wheel integrally formed with a formed outer member and a wheel mounting flange for mounting a wheel at one end, and having a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub ring An inner member formed of at least one inner ring that is press-fitted, and formed with a double row inner rolling surface facing the double row outer rolling surface on the outer periphery, and each of the outer member and the inner member A double-row rolling element accommodated between the rolling surfaces, a pulsar ring that is externally fitted to the inner ring and whose characteristics are alternately changed at equal intervals in the circumferential direction, and the outer member It is fitted to the inner side end of the non-magnetic steel plate by pressing. In the wheel bearing device with a rotational speed detection device, the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap through the protective cover. Is a cylindrical fitting portion that is press-fitted into the inner periphery of the inner side end of the outer member, and extends radially inward from the fitting portion, and confronts the pulsar ring via a slight axial clearance. A disc-shaped shielding portion and a bottom portion that covers the inner side end of the inner member from the shielding portion through a bent portion, and the fitting portion of the protective cover is more rigid than other portions. It is set high.

  In this way, the palsar ring that is externally fitted to the inner ring, the characteristics are alternately changed at equal intervals in the circumferential direction, and the inner side end of the outer member is fitted and pressed from a non-magnetic steel plate. A protective cover for a wheel bearing device with a rotational speed detection device, wherein the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap via the protective cover. Is a cylindrical fitting portion that is press-fitted into the inner periphery of the inner side end of the outer member, and a disc that extends radially inward from this fitting portion and faces the pulsar ring via a slight axial clearance. And a bottom portion that covers the inner side end of the inner member from the shielding portion through a bent portion, and the fitting portion of the protective cover is set to be higher in rigidity than other portions. Because the protective cover Aims to improve the ring stiffness, it is possible to provide a rotational speed detector equipped wheel support bearing assembly having improved pull strength.

  Preferably, as in the invention described in claim 2, if the plate thickness of the fitting portion is formed thicker than the plate thickness of other portions, the ring rigidity of the protective cover is reliably improved. be able to.

  Moreover, if the adhesive agent or liquid packing is apply | coated to the outer peripheral surface of the said fitting part like invention of Claim 3, the airtightness of a fitting part can be improved.

  According to a fourth aspect of the present invention, the fitting portion includes a cylindrical portion that is metal-fitted to the fitting surface of the outer member, and a reduced diameter portion that extends in the axial direction from the cylindrical portion. If the elastic member made of synthetic rubber is integrally joined to the outer peripheral surface of the reduced diameter portion by vulcanization adhesion, the airtightness of the fitting portion with the outer member is increased, and the sealing performance is improved.

  Moreover, if the cylindrical part of the said fitting part is comprised by the superposition | polymerization part formed by bending the edge part to an internal diameter side like invention of Claim 5, the plate | board thickness of a cylindrical part will be The plate thickness can be substantially double that of other parts, and the ring rigidity of the fitting portion can be effectively improved.

  Moreover, if the cylindrical part of the said fitting part is equipped with the bending part extended radially inward from the edge part like invention of Claim 6, the ring rigidity of a fitting part is effective. Can be improved.

  According to a seventh aspect of the invention, the cylindrical portion of the fitting portion includes a locking portion that protrudes radially outward from the end portion, and is formed on the inner periphery of the end portion of the outer member. If it is engaged with the annular groove, the ring rigidity of the fitting portion can be improved, and the pull-out strength of the protective cover can be remarkably increased by the locking portion.

  Further, as in the invention described in claim 8, a chamfered portion is formed in the locking portion, and the diameter of the chamfered portion is smaller than the diameter of the chamfered portion formed at the inner diameter end of the outer member. If set, when the protective cover is press-fitted into the outer member, the fitting portion is easily elastically deformed, and the press-fitting workability can be improved.

  Moreover, if the slit extended in an axial direction is formed in the opening edge part of the said fitting part like invention of Claim 9, the amount of press-fitting work will fall by the part which the ring rigidity of the fitting part improved. Can be prevented.

  Further, as in the invention according to claim 10, if the inner diameter of the opening end portion of the fitting portion is set to be smaller than the outer diameter of the reduced diameter portion, lamination is performed before vulcanization of the elastic member. It is possible to prevent the fitted protective covers from being fitted with each other, and to improve the workability at the time of manufacture.

  Further, as in the invention according to claim 11, a fitting surface of the outer member to which the protective cover is fitted and a chamfered portion formed at an inner diameter end portion of the outer member are a total type grindstone. If the grinding is simultaneously performed, the dimensional accuracy is improved and the coaxiality of both is increased, so that the workability of press-fitting the protective cover can be further 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. And a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end thereof and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub ring An inner member comprising a plurality of inner rings, and an inner member formed with a double row inner rolling surface facing the outer surface of the double row on the outer periphery, and between the respective rolling surfaces of the outer member and the inner member. A double-row rolling element housed in a freely rotatable manner, a pulsar ring that is externally fitted to the inner ring and whose characteristics are alternately changed at equal intervals in the circumferential direction, and an inner end of the outer member And formed by pressing from a non-magnetic steel plate. In the wheel bearing device with a rotational speed detecting device, the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap through the protective cover. A cylindrical fitting portion that is press-fitted into the inner circumference of the inner side end of the outer member, and a disc that extends radially inward from the fitting portion and faces the pulsar ring via a slight axial clearance. And a bottom part that covers the inner side end of the inner member from the shielding part through a bent part, and the fitting part of the protective cover is set to be higher in rigidity than other parts. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that improves the ring rigidity of the protective cover and has an increased pulling strength.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. (A) is explanatory drawing which shows the lamination | stacking state of the protective cover which concerns on this invention, (b) is explanatory drawing which shows the lamination | stacking state after rubber vulcanization of a protective cover same as the above. It is a principal part enlarged view which shows the modification of the protective cover of FIG. It is a principal part enlarged view which shows the other modification of the protective cover of FIG. It is a principal part enlarged view which shows the modification of the protective cover of FIG. It is a principal part enlarged view which shows the modification of the protective cover of FIG. It is a principal part enlarged view which shows the modification of the protective cover of FIG. It is a principal part enlarged view which shows the modification of the protective cover of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and having an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring that is press-fitted into a small-diameter step portion and has an inner rolling surface that is opposed to the other outer rolling surface of the double row on the outer periphery, and each of the inner member and the outer member. A double-row rolling element accommodated between the rolling surfaces, a pulsar ring that is externally fitted to the inner ring and whose characteristics are alternately changed at equal intervals in the circumferential direction, and the outer member Fitted to the inner side end of the steel and formed by pressing from a non-magnetic steel plate In the wheel bearing device with a rotational speed detection device, the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap via the protective cover. A cylindrical fitting portion that is press-fitted into the inner periphery of the outer side end of the outer member, and a circle that extends radially inward from the fitting portion and faces the pulsar ring via a slight axial clearance. A plate-shaped shielding portion, and a bottom portion that covers the inner side end of the inner member from the shielding portion through a bent portion, and the fitting portion is located in the inner side end of the outer member. It is composed of a cylindrical portion that is metal-fitted to a fitting surface formed on the periphery, and whose plate thickness is formed thicker than the plate thickness of other parts, and a reduced diameter portion that extends in the axial direction from this cylindrical portion, An elastic member made of synthetic rubber is added to this reduced diameter part. They are joined together by adhesive.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 1, and FIG. Explanatory drawing which shows the lamination | stacking state of the protective cover which concerns on this invention, (b) is the same as the above, explanatory drawing which shows the lamination | stacking state after rubber | gum vulcanization of a protective cover, FIGS. 4-9 is the protective cover which concerns on this invention It is a principal part enlarged view which shows a modification. 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).

  The wheel bearing device with a rotational speed detection device shown in FIG. 1 is called the third generation on the driven wheel side, and is located between the inner member 1 and the outer member 2, and between the inner member 1 and the outer member 2. It has double row rolling elements (balls) 3 and 3 accommodated therein. The inner member 1 includes a hub ring 4 and a separate inner ring 5 fixed to the hub ring 4.

  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 has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface. A small diameter step 4b extending in the axial direction from the surface 4a is formed. Hub bolts 6 a for fixing the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 6.

  The inner ring 5 is formed with the other (inner side) inner raceway surface 5a on the outer periphery, and is press-fitted into the small-diameter step portion 4b of the hub ring 4 via a predetermined squeeze. And it fixes to the axial direction in the state to which the predetermined bearing preload was provided by the crimping part 7 formed by carrying out the plastic deformation of the edge part of the small diameter step part 4b to radial direction outward.

  The hub wheel 4 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner rolling surface 4a and an inner side of a wheel mounting flange 6 that becomes a seal land portion of a seal 9 to be described later. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the base 6b to the small diameter step 4b. Note that the caulking portion 7 is an unquenched portion having a material surface hardness of 25 HRC or less after forging. Further, 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 part by quenching.

  On the other hand, the outer member 2 integrally has a vehicle body mounting flange 2b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row inner rolling of the inner member 1 on the inner periphery. Double-row outer rolling surfaces 2a and 2a facing the surfaces 4a and 5a are integrally formed. This outer member 2 is formed of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, as in the case of the hub wheel 4, and at least the double row outer raceway surfaces 2 a and 2 a are surfaced by induction hardening. Hardening is performed in the range of 58 to 64 HRC. And the double row rolling elements 3 and 3 are accommodated so that rolling is possible via the holder | retainer 8 between these both rolling surfaces 2a, 4a and 2a, 5a.

  Among the openings of the annular space formed between the outer member 2 and the inner member 1, a seal 9 is attached to the opening on the outer side, and a protective cover 10 is attached to the opening on the inner side. Leakage of the lubricating grease enclosed in the outside and rain water and dust from the outside are prevented from entering the inside of the bearing.

  In addition, although what was comprised here as the wheel bearing apparatus was comprised by the double row angular contact ball bearing which used the rolling element 3 as a ball | bowl, it is not restricted to this, The double row tapered roller bearing which used the tapered roller for the rolling element It may be configured by. Further, the third generation structure is illustrated, but a so-called second generation structure in which a pair of inner rings are press-fitted into the hub ring may be used.

  The outer-side seal 9 includes a core 11 that is press-fitted into the inner circumference of the outer-side end portion of the outer member 2 via a predetermined shimiro, and a seal member that is integrally joined to the core 11 by vulcanization adhesion It is comprised by the integral seal | sticker which consists of 12. The metal core 11 is formed from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a cold rolled steel plate (JIS standard SPCC type or the like) in a substantially L-shaped cross section by press working.

  On the other hand, the seal member 12 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), is formed to be inclined outward in the radial direction, and is slidably contacted with a base portion 6b having a circular section in a predetermined axial direction. The side lip 12a and the dust lip 12b, and the grease lip 12c formed so as to be inclined toward the inner side of the bearing and slidably contacted with the base portion 6b via a predetermined radial shimoshiro.

  In addition to NBR, the material of the seal member 12 is excellent in heat resistance and chemical resistance, such as HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc., which have excellent heat resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber.

  Here, a pulsar ring 13 is press-fitted into the outer diameter of the inner ring 5. This pulsar ring 13 is formed into an L shape by pressing from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 series or the like) or a rust-proof cold rolled steel plate, and is formed into an annular shape as a whole. The support ring 14 is formed, and a magnetic encoder 15 is integrally joined to the support ring 14.

  As shown in an enlarged view in FIG. 2, the support ring 14 includes a cylindrical fitting portion 14a that is press-fitted into the outer diameter of the inner ring 5, and a standing plate portion 14b that extends radially inward from the fitting portion 14a. It has. The magnetic encoder 15 is integrally joined to the standing plate portion 14b by vulcanization adhesion. This magnetic encoder 15 constitutes a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and magnetizing magnetic poles N and S alternately in the circumferential direction.

  Although the pulsar ring 13 having the magnetic encoder 15 made of a rubber magnet is illustrated here, the present invention is not limited to this, and any configuration may be used as long as the characteristics change alternately in the circumferential direction and at equal intervals. It may be a pulsar ring made of steel plate in which holes and irregularities are formed, or may be formed of a sintered alloy. Further, a plastic magnet may be joined.

  In the present embodiment, the protective cover 10 is press-fitted into the inner periphery of the inner side end of the outer member 2 to close the inner opening of the outer member 2. The protective cover 10 is made of a non-magnetic steel plate having corrosion resistance, for example, an austenitic stainless steel plate so as not to adversely affect the sensing performance of the rotational speed sensor 16 described later.

  The protective cover 10 is a cylindrical fitting portion 10a that is press-fitted into the inner periphery of the end portion of the outer member 2, and extends radially inward from the fitting portion 10a. The magnetic encoder 15 is provided with a slight axial clearance. And a bottom 10d that covers the inner end of the inner member 1 from the shield 10b through the bent portion 10c (see FIG. 1).

  The detection part of the rotation speed sensor 16 is brought close to or in contact with the shielding part 10b of the protective cover 10, and the detection part and the magnetic encoder 15 are arranged to face each other with a predetermined air gap (axial clearance) through the protective cover 10. ing. The rotational speed sensor 16 is made of injection-moldable synthetic resin such as PA66, and has a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element), etc., whose characteristics change according to the flow direction of magnetic flux, and the magnetic detecting element. An IC (not shown) or the like in which a waveform shaping circuit for adjusting an output waveform is embedded is embedded, and constitutes an automobile ABS that detects the rotational speed of a wheel and controls its rotational speed.

  In the present embodiment, the fitting portion 10 a of the protective cover 10 is metal-fitted to a fitting surface 2 c formed on the inner periphery of the inner side end of the outer member 2. It is comprised by the diameter reducing part 18 extended in an axial direction. An elastic member 19 made of synthetic rubber such as NBR is integrally joined to the reduced diameter portion 18 by vulcanization adhesion. The elastic member 19 is joined so as not to interfere with the rotational speed sensor 16 from the side surface of the shielding portion 10 b of the protective cover 10 and is joined so as not to interfere with the rotational speed sensor 16, and an annular projection 19 a that projects radially outward from the outer diameter of the cylindrical portion 17. It has. The annular protrusion 19a is elastically deformed and crimped to the inner periphery of the end of the outer member 2 when the protective cover 10 is fitted, thereby improving the airtightness of the fitting part 10a.

  Here, the plate thickness t1 of the cylindrical portion 17 of the fitting portion 10a is formed to be thicker (t1> t0) than the plate thickness t0 of other portions. Thereby, the improvement of the ring rigidity of the fitting part 10a in the protective cover 10 can be aimed at, and the wheel bearing apparatus with a rotational speed detection apparatus which improved the pulling-out yield strength can be provided.

  As shown in FIG. 3A, such a protective cover 10 is usually stored in a stacked state so as not to take up installation space or waits for the process, but before the elastic member 19 is vulcanized. In order to prevent the stacked protective covers 10 ′ from being fitted to each other, the inner diameter d 1 of the cylindrical portion 17 in the fitting portion 10 a is smaller than the outer diameter d 2 of the reduced diameter portion 18 (d 1 <d 2). Is set to As a result, not only before the elastic member 19 is vulcanized but also after the elastic member 19 is vulcanized, the workability in the manufacturing process of the laminated protective cover 10 is further improved. Can do.

  FIG. 4 shows a modification of the protective cover 10 of FIG. In this embodiment, basically, the configuration of the fitting portion of the protective cover is only partially different from that described above, and the same reference numerals are given to other parts and parts having the same function or the same function. Detailed description is omitted.

  A protective cover 20 is attached to the outer member 2 to close the inner side opening of the outer member 2. The protective cover 20 is formed in a cup shape by press-molding a non-magnetic austenitic stainless steel plate. The protective cover 20 is a cylindrical fitting portion 20a that is press-fitted into the inner periphery of the end portion of the outer member 2, and extends radially inward from the fitting portion 20a, and the magnetic encoder 15 is provided with a slight axial clearance. The disk-shaped shielding part 10b which opposes is provided.

  In this embodiment, the elastic member mentioned above is not joined to the fitting part 20a of the protective cover 20, and instead, at least the fitting part is provided on the inner end face 2d side of the outer member 2 in the fitting part 20a. An adhesive or liquid packing is interposed in the range of the width 1/3 of 20a. Thereby, while being able to improve the airtightness of the fitting part 20a, the ring rigidity of the fitting part 20a can be improved rather than embodiment mentioned above. Examples of the adhesive include epoxy resin, phenol resin, polyurethane, and polyethylene.

  The protective cover 21 shown in FIG. 5 is formed into a cup shape by press-molding a non-magnetic austenitic stainless steel plate, and a cylindrical fitting portion 21a that is press-fitted into the inner periphery of the end portion of the outer member 2. A disc-shaped shielding portion 10b that extends radially inward from the fitting portion 21a and faces the magnetic encoder 15 via a slight axial clearance is provided.

  In the present embodiment, the fitting portion 21 a of the protective cover 21 has a cylindrical overlapping portion 22 that is metal-fitted to the fitting surface 2 c of the outer member 2, and a reduced diameter portion that extends from the overlapping portion 22 in the axial direction. 18. The overlapping portion 22 can be substantially doubled in thickness by bending the end portion of the protective cover 21 to the inner diameter side, and can effectively improve the ring rigidity of the fitting portion 21a. .

  The protective cover 23 shown in FIG. 6 is formed by pressing a non-magnetic austenitic stainless steel plate into a cup shape, and a cylindrical fitting portion 23a that is press-fitted into the inner periphery of the end portion of the outer member 2. A disc-shaped shielding portion 10b is provided that extends radially inward from the fitting portion 23a and faces the magnetic encoder 15 via a slight axial clearance.

  In the present embodiment, the fitting portion 23a of the protective cover 23 has a cylindrical portion 24a that is metal-fitted to the fitting surface 2c of the outer member 2, a reduced diameter portion 18 that extends from the cylindrical portion 24a in the axial direction, It is comprised by the bending part 24b extended in a radial direction inward from the edge part of the cylindrical part 24a. The ring portion 24b can effectively improve the ring rigidity of the fitting portion 23a.

  The protective cover 25 shown in FIG. 7 is formed into a cup shape by press-molding a non-magnetic austenitic stainless steel plate, and a cylindrical fitting portion 25a that is press-fitted into the inner periphery of the end portion of the outer member 2 ′. A disk-shaped shielding portion 10b that extends radially inward from the fitting portion 25a and faces the magnetic encoder 15 via a slight axial clearance is provided.

  In the present embodiment, the fitting portion 25a of the protective cover 25 includes a cylindrical portion 26a that is metal-fitted to the fitting surface 2c of the outer member 2 ′, and a reduced diameter portion 18 that extends from the cylindrical portion 26a in the axial direction. The locking portion 26b protrudes radially outward from the end of the cylindrical portion 26a. The thickness t1 of the cylindrical portion 26a is formed to be thicker than the thickness t0 of other portions, and the locking portion 26b is related to the annular groove 27 formed on the inner periphery of the end of the outer member 2 ′. Match. Thereby, while being able to improve the ring rigidity of the fitting part 25a, the pulling-out yield strength of the protective cover 25 can be raised significantly by the latching part 26b.

  In addition, although the fitting part 25a of the protective cover 25 is elastically deformed and press-fitted into the outer member 2 ', in this case, the press-fitting operation is not lowered by the amount that the ring rigidity of the fitting part 25a is improved. Although not shown, a slit extending in the axial direction may be formed from the cylindrical portion 26a of the fitting portion 25a to the locking portion 26b. A plurality of slits may be formed corresponding to the ring rigidity of the fitting portion 25a.

  The protective cover 28 shown in FIG. 8 is formed into a cup shape by press-molding a non-magnetic austenitic stainless steel plate, and a cylindrical fitting portion 28a that is press-fitted into the inner periphery of the end portion of the outer member 2. A disc-shaped shielding portion 10b that extends radially inward from the fitting portion 28a and faces the magnetic encoder 15 via a slight axial clearance is provided.

  In the present embodiment, the fitting portion 28 a of the protective cover 28 includes a cylindrical portion 17 that is metal-fitted to the fitting surface 2 c of the outer member 2 ′, and a reduced diameter portion 18 that extends in the axial direction from the cylindrical portion 17. And a locking portion 17a that protrudes radially outward from the end of the cylindrical portion 17 is formed. The engaging portion 17a engages with the annular groove 27 'formed on the inner periphery of the end of the outer member 2', so that the ring rigidity of the fitting portion 28a can be improved and the pulling strength of the protective cover 28 is increased. Can be significantly increased.

  The protective cover 29 shown in FIG. 9 is formed into a cup shape by press-molding a non-magnetic austenitic stainless steel plate, and a cylindrical fitting portion 29a that is press-fitted into the inner periphery of the end of the outer member 2 ′. A disk-shaped shielding portion 10b that extends radially inward from the fitting portion 29a and faces the magnetic encoder 15 through a slight axial clearance is provided.

  In the present embodiment, the fitting portion 29a of the protective cover 29 includes a cylindrical portion 17 that is metal-fitted to the fitting surface 2c of the outer member 2 ′, and a reduced diameter portion 18 that extends from the cylindrical portion 17 in the axial direction. And a locking portion 17b protruding radially outward from the end of the cylindrical portion 17 is formed, and a chamfered portion 30 is formed on the locking portion 17b.

  Here, the chamfered diameter d3 of the locking portion 17b of the protective cover 29 is set to a smaller diameter (d3 <d4) than the inner diameter d4 of the chamfered portion 31 formed at the inner diameter end of the outer member 2 '. Accordingly, when the protective cover 29 is press-fitted into the outer member 2 ′, the fitting portion 29 a is easily elastically deformed, and the press-fitting workability can be improved.

  In addition, by simultaneously grinding the fitting surface 2c and the chamfered portion 31 of the outer member 2 'with a general-purpose grindstone, the dimensional accuracy is improved and the coaxiality of both is increased, and the press-fitting operation of the protective cover 29 is performed. The property can be further 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 rotational speed detection device according to the present invention can be applied to a wheel bearing device for a driven wheel, or an inner ring rotating type wheel having any structure such as a ball or a tapered roller.

DESCRIPTION OF SYMBOLS 1 Inner member 2, 2 'Outer member 2a Outer rolling surface 2b Car body mounting flange 2c Outer member fitting surface 2d Outer member end surface 3 Rolling element 4 Hub wheel 4a, 5a Inner rolling surface 5 Inner ring 6 Wheel mounting flange 6a Hub bolt 6b Base 7 on the inner side of the wheel mounting flange 7 Clamping portion 8 Cage 9 Seals 10, 10 ', 20, 21, 23, 25, 28, 29 Protective covers 10a, 14a, 20a, 21a, 23a 25a, 28a, 29a Fitting portion 10b Shielding portion 10c Bending portion 10d Bottom portion 11 Core 12 Seal member 12a Side lip 12b Dustrip 12c Grease lip 13 Pulsar ring 14 Support ring 14b Standing plate portion 15 Magnetic encoder 16 Rotational speed sensor 17, 24a, 26a Cylindrical portions 17a, 17b, 26b Locking portion 18 Reduced diameter portion 19 Elastic member 19a Annular protrusion 22 Polymerization 24b Folded portions 27, 27 'Annular grooves 30, 31 Chamfered portion 51 Inner member 52 Outer member 52a Outer rolling surface 52b Car body mounting flange 53 Ball 54 Hub wheels 54a, 55a Inner rolling surface 54b Small diameter step portion 55 Inner ring 56 Wheel mounting flange 57 Caulking portion 57a Recess 58 Cage 59 Seal 60 Protective cover 60a Fitting portion 60b Shielding portion 60c Inclined portion 60d Bottom portion 60e Stepped portion 61 Support ring 62 Magnetic encoder d1 Inner diameter of protective cover fitting portion d2 Outer diameter of the reduced diameter portion of the protective cover d3 Chamfered diameter of the protective cover d4 Inner diameter of the chamfered portion of the outer member t0 Thickness of the plate other than the fitted portion of the protective cover t1 Thickness of the fitted portion of the protective cover

Claims (11)

An outer member integrally having a vehicle body mounting flange for being attached to the knuckle on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
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 accommodated in a freely rolling manner between the rolling surfaces of the outer member and the inner member;
Pulsar ring that is externally fitted to the inner ring, and the characteristics are changed alternately and at equal intervals in the circumferential direction;
A cup-shaped protective cover that is fitted to the inner side end of the outer member and formed by pressing from a non-magnetic steel plate;
In the wheel bearing device with a rotational speed detection device in which the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap through the protective cover,
The protective cover is press-fitted into an inner periphery of the outer member on the inner side, and a cylindrical fitting portion extends radially inward from the fitting portion through a slight axial clearance in the pulsar ring. And a bottom part covering the inner side end of the inner member from the shielding part through a bent part, and the fitting part of the protective cover is more than the other part. The wheel bearing device with a rotational speed detection device is characterized in that the rigidity is also set high.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein the thickness of the fitting portion is formed to be thicker than the thickness of other portions.   The wheel bearing device with a rotation speed detection device according to claim 1 or 2, wherein an adhesive or liquid packing is applied to an outer peripheral surface of the fitting portion.   The fitting portion includes a cylindrical portion that is metal-fitted to the fitting surface of the outer member, and a reduced diameter portion that extends in the axial direction from the cylindrical portion, and the outer peripheral surface of the reduced diameter portion is made of synthetic rubber. The wheel bearing device with a rotational speed detection device according to claim 1 or 2, wherein the elastic member is integrally joined by vulcanization adhesion.   The wheel bearing device with a rotational speed detection device according to claim 4, wherein the cylindrical portion of the fitting portion is configured by a superposed portion formed by bending an end portion thereof toward an inner diameter side.   The wheel bearing device with a rotational speed detection device according to claim 4, wherein the cylindrical portion of the fitting portion includes a bent portion extending radially inward from an end portion thereof.   The cylindrical portion of the fitting portion includes a locking portion protruding radially outward from an end portion thereof, and is engaged with an annular groove formed on an inner periphery of the end portion of the outer member. The bearing apparatus for wheels with a rotational speed detection apparatus of description.   The rotation speed detection according to claim 7, wherein a chamfered portion is formed in the locking portion, and a diameter of the chamfered portion is set smaller than a diameter of a chamfered portion formed at an inner diameter end portion of the outer member. Wheel bearing device with device.   The wheel bearing device with a rotational speed detection device according to any one of claims 2 to 8, wherein a slit extending in an axial direction is formed at an opening end portion of the fitting portion.   The wheel bearing device with a rotational speed detection device according to claim 4, wherein an inner diameter of an opening end portion of the fitting portion is set to be smaller than an outer diameter of the reduced diameter portion.   The fitting surface of the said outer member with which the said protective cover is fitted, and the chamfered part formed in the internal-diameter end part of the said outer member are grind-processed simultaneously with a total type grindstone. Wheel bearing device with rotation speed detector.

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