JP2013028248A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel, in which airtightness of a fitting part is improved by preventing press-fit scratch and galling when a cap is press-fitted, and press-fit working efficiency is improved by presetting the cap before press-fitting.SOLUTION: The cap 10 includes: a cylindrical fitting part 10a press-fitted to an outer member 2; a disk-shaped shield part 10b extending in a radially inward direction; and a bottom part 10d for covering the end section of an inner member 1 via a bending part 10c. The fitting part 10a includes: a cylindrical part 17 metal-fitted to the fitting face 2c of the outer member 2; and a diameter reduction part 18 extending in a shaft direction in an inclined manner. An elastic member 19 is joined to the outer peripheral face of the diameter reduction part, and a circular projection 19a projecting in radially outward directions from the outer diameter of the cylindrical part 17 is provided. A step in the radial direction is formed by press working in the end section of the cylindrical part 17, and its outer diameter d1 is set smaller than the inner diameter d0 of the fitting face 2c, and the width L1 of the step is set larger than the width L2 of a chamfered part 2c of the outer member 2.

Description

  The present invention improves the structure of a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, in particular, a cap and a press-fitting portion to which the cap is attached, thereby causing the occurrence of press-fitting scratches and galling. The present invention relates to a wheel bearing device that prevents airtightness by preventing it.

  A wheel bearing device that rotatably supports a wheel with respect to a suspension device of an automobile has been made lighter and more compact for improving fuel efficiency, not to mention cost reduction. These wheel bearing devices are configured by unitizing a hub wheel and a double row rolling bearing. As a typical example, a wheel bearing device shown in FIG. 12 is known.

  This wheel bearing device includes an outer member 50, a pair of inner rings 51, 51, and double-row balls 52, 52 accommodated between these members. The outer member 50 integrally has a wheel mounting flange 53 at one end, and double row outer rolling surfaces 50a and 50a are formed on the inner periphery.

  The pair of inner rings 51, 51 are fitted (clear fit) to the axle shaft 54 and are fixed in the axial direction via a fixing nut 55. In addition, a shield 56 and a seal 57 are attached to the opening portion of the annular space formed between the inner ring 51 and the outer member 50 to prevent leakage of the lubricating grease sealed inside the bearing and to prevent rainwater and dust from the outside. Or the like is prevented from entering the inside of the bearing (the shield 56 forms a labyrinth with the inner ring 51 to prevent scattering of the lubricating grease).

  The outer member 50 is provided with a brake pilot portion 58 and a wheel pilot portion 59 that extend in the axial direction from the wheel mounting flange 53. The brake pilot portion 58 is formed as a cylindrical projecting portion concentric with the outer member 50, and the wheel pilot portion 59 is formed with a slightly smaller diameter than the brake pilot portion 58 and is separated from the circumferential direction. Has been.

  The cap 60 is formed into a cup shape by press working from a steel plate having corrosion resistance. As shown in FIG. 13 (a), the cap 60 includes a cylindrical portion 60a, an overlapping portion 60b extending radially outward from the cylindrical portion 60a, and a bottom portion 60c formed continuously from the overlapping portion 60b. Consists of.

  Further, a plurality of claw portions 61 are formed in the circumferential direction at the end portion of the cylindrical portion 60a of the cap 60, which is inclined by a predetermined angle outward in the radial direction by cutting and raising processing. On the other hand, as shown in FIG. 14, an annular groove 62 is formed on the inner peripheral surface of the cylindrical brake pilot portion 58 by machining such as turning. The cap 60 is press-fitted in a state where the claw portion 61 is elastically deformed until the overlapping portion 60 b abuts the end surface of the wheel pilot portion 59, and the claw portion 61 is elastically restored at the position of the annular groove 62 to enter the annular groove 62. Engage. Thereby, while being able to fix the cap 60 to the outer member 50 reliably, the rust prevention improvement of the pilot parts 58 and 59 can be aimed at (for example, refer patent document 1).

Japanese Patent Laid-Open No. 2007-1341

  In this conventional wheel bearing device, even in the case of the split-type pilot portions 58 and 59, the cap 60 is securely fixed to the outer member 50, thereby preventing the inside of the bearing from being rusted and the pilot portion 58. , 59 can be prevented from developing rust. However, since the cap 60 press-fitted into the pilot portions 58 and 59 is formed by pressing from a steel plate, it is difficult to ensure the dimensions and roundness of the cylindrical portion 60a with high accuracy. Therefore, in order to prevent the cap 60 from moving or falling off, the squeeze range of this type of cylindrical portion 60a is generally set to be as large as 0.1 to 0.4 mm.

  Furthermore, as shown in FIG. 14, if the width A of the guide portion 63 of the pilot portions 58 and 59 is insufficient, the cap 60 may be inclined and press-fitted in addition to the large size of the cylindrical portion 60 a. . As a result, there is a possibility that a streak-like press-fitting 64 extending in the axial direction as shown in FIG. 13B or galling occurs in the cylindrical portion 60a of the cap 60. As a result, the airtightness is impaired by the press-fitting wound 64 and galling, and rainwater or the like may enter from the fitting portion and the bearing life may be shortened.

  The present invention has been made in view of such circumstances, and prevents the occurrence of press-fitting scratches and galling at the time of press-fitting the cap, thereby improving the air tightness of the fitting portion, and presetting the cap before press-fitting. An object of the present invention is to provide a wheel bearing device with improved press-fit workability.

  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 plurality of rolling elements accommodated between the rolling surfaces, and a cup-shaped cap that is fitted to the inner side end of the outer member and formed by pressing from a steel plate. In the wheel bearing device, the cap includes the outer member. A cylindrical fitting portion press-fitted into the inner periphery of the inner end, a disc-shaped shielding portion extending radially inward from the fitting portion, and the inner member from the shielding portion via a bent portion And a bottom portion that covers the end on the inner side, and a step in the radial direction is formed on one of the fitting surfaces of the cap and the outer member.

  Thus, in the wheel bearing device with a rotational speed detection device fitted to the inner side end of the outer member and provided with a cup-shaped cap formed by pressing from a steel plate, the cap is the outer member. A cylindrical fitting portion that is press-fitted into the inner periphery of the inner side end of the inner member, a disc-shaped shielding portion that extends radially inward from the fitting portion, and an inner member that extends from the shielding portion via a bent portion And a bottom portion that covers the end of the inner side, and a radial step is formed on one of the fitting surfaces of the cap and the outer member. When press-fitting, it can be preset with the cap aligned, preventing the occurrence of press-fitting scratches and galling during cap-fitting, and improving the air tightness of the mating part and improving the press-fitting workability. Providing a wheel bearing device Kill.

  Preferably, as in the invention described in claim 2, when the step is set in a range of 0.15 to 0.30 mm, a good guide clearance at the time of press-fitting is obtained, so that the press-fitting workability is improved. Can be planned.

  Moreover, like invention of Claim 3, the fitting part of the said cap is a cylindrical part metal-fitted to the fitting surface formed in the edge part inner periphery of the said outer member, From this cylindrical part It is composed of a tapered reduced diameter portion extending in an axial direction, the step is formed at the end of the cylindrical portion by pressing, and its outer diameter is smaller than the inner diameter of the fitting surface of the outer member It may be set to.

  Further, as in the invention described in claim 4, the fitting portion of the cap has a cylindrical portion that is metal-fitted to a fitting surface formed on the inner periphery of the end portion of the outer member, and the cylindrical portion. If it is composed of a tapered diameter-reducing portion extending in an axial direction and the end portion of the cylindrical portion is a small-diameter portion reduced in diameter by the step, the thickness of the fitting portion is reduced and the strength is reduced. It is possible to perform presetting in a state where the cap is aligned without lowering the pressure, and the press-fitting workability can be improved.

  According to a fifth aspect of the present invention, an elastic member made of synthetic rubber is integrally joined to the outer peripheral surface of the reduced diameter portion by vulcanization adhesion, and is radially outward from the outer diameter of the cylindrical portion of the cap. If the annular projection is provided on the inner member, the annular projection is elastically deformed and crimped to the inner periphery of the end of the outer member when the cap is fitted, and the tightness of the fitting portion with the outer member is increased and sealed. Improves.

  Further, as in the invention described in claim 6, if the inner diameter of the end portion of the cylindrical portion of the cap is set to be smaller than the outer diameter of the side surface of the elastic member, the elastic member has a cylindrical portion. The end portions of the caps are in contact with each other reliably, and the workability in the manufacturing process of the laminated cap can be improved.

  If the width of the step of the cap is set to be larger than the width of the chamfered portion of the end inner diameter of the outer member as in the invention described in claim 7, the cap is removed from the outer member. When press-fitting into the cap, it can be preset in a state in which the posture of the cap is restricted, and the press-fitting workability can be further improved.

  Further, as in the invention according to claim 8, a guide portion comprising the step is formed on the inner periphery of the end portion of the outer member, and the inner diameter thereof is set larger than the outer diameter of the fitting portion of the cap. May be.

  Further, as in the invention described in claim 9, the connecting portion of the outer member and the connecting portion of the guide portion are formed in an arc shape having a predetermined radius of curvature, the outer rolling surface and the fitting surface, If the joint portion is simultaneously ground by the general-purpose grindstone, the dimensional accuracy is improved, the coaxiality of both is increased, and the workability of the press-fitting of the cap can be further improved.

  Further, as in the invention described in claim 10, when the surface runout of the shielding portion with respect to the cylindrical portion of the cap is restricted to 0.15 mm or less, the cap can be preset in a state in which the posture of the cap is restricted. .

  Further, as in the invention of claim 11, a pulsar ring is externally fitted to the inner ring, the pulsar ring is formed by pressing from a steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the outer diameter surface of the inner ring. The support ring provided with a standing plate portion extending radially from the fitting portion, and the standing plate portion of the support ring are integrally joined by vulcanization adhesion, and magnetic powder is mixed into the elastomer in the circumferential direction. The magnetic encoder has magnetic poles N and S alternately magnetized, and a rotational speed sensor is opposed to the magnetic encoder through the cap to a predetermined axial clearance, and the support ring and the inner ring are fitted together. If there is a step in the radial direction on one of the mating surfaces, the pulsar ring can be preset with the core ring aligned when press-fitting the pulsar ring into the inner ring. To prevent the occurrence of scratches and galling with improved airtightness of the fitting portion, it is possible to improve the press-workability.

  Further, as in the invention according to claim 12, the step is formed by press working at an end of the fitting portion of the support ring, and the inner diameter thereof is set larger than the outer diameter of the inner ring. Also good.

  Further, as in the invention described in claim 13, if the width of the step of the support ring is set to be larger than the width of the chamfered portion at the end outer diameter of the inner ring, the pulsar ring is press-fitted into the inner ring. In doing so, it can be preset in a state in which the posture of the pulsar ring is restricted, and the press-fit workability can be further improved.

  Further, as in the invention described in claim 14, if the perpendicularity of the magnetic encoder with respect to the fitting portion of the support ring is restricted to 0.30 mm or less, presetting is performed in a state where the posture of the pulsar ring is restricted. Can do.

  Further, as in the invention described in claim 15, if the guide portion comprising the step is formed on the outer periphery of the end portion of the inner ring, and the outer diameter is set smaller than the outer diameter of the inner ring, the pulsar ring Can be preset with the pulsar ring centered, preventing the occurrence of press-fitting scratches and galling during pulsar ring press-fitting and improving the air tightness of the fitting part. Improvements can be made.

  Further, as in the invention described in claim 16, if the outer diameter of the fitting portion of the support ring is set to be larger than the inner diameter of the magnetic encoder, the support ring is fitted to the magnetic encoder. The joint part can be surely brought into contact, and the workability in the manufacturing process of the laminated pulsar ring can be improved.

  In addition, as in the invention described in claim 17, the outer diameter surface of the inner ring and the connecting portion of the guide portion are formed in an arc shape having a predetermined radius of curvature, and the inner raceway surface and the outer diameter surface of the inner ring, If the joint portion is simultaneously ground by the general-purpose grindstone, the dimensional accuracy is improved and the coaxiality between the two is increased, and the workability of press fitting of the pulsar ring can be further improved.

  The wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange to be attached to a knuckle on the outer periphery, and an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and one end portion And a hub ring integrally having a wheel mounting flange for mounting a wheel on the outer periphery, 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 having a double row inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and freely rollable between the rolling surfaces of the outer member and the inner member. In a wheel bearing device comprising: a accommodated double row rolling element; and a cup-shaped cap that is fitted to an inner side end portion of the outer member and is formed by pressing from a steel plate. And press-fitting into the inner circumference of the inner side end of the outer member A cylindrical fitting portion, a disc-shaped shielding portion extending radially inward from the fitting portion, and a bottom portion that covers the inner side end of the inner member from the shielding portion via a bent portion And a step in the radial direction is formed on one of the fitting surfaces of the cap and the outer member, so that the cap is aligned when the cap is pressed into the outer member. Provided is a wheel bearing device that can be preset in a state where it has been pressed, prevents the occurrence of press-fitting scratches and galling during cap press-fitting, improves the air tightness of the fitting portion, and improves the press-fitting workability. be able to.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view which shows the state with which the cap and pulsar ring of FIG. 1 were mounted | worn. (A) is explanatory drawing which shows the preset of the cap of FIG. 2, (b) is explanatory drawing which shows the preset of the pulsar ring of FIG. (A) is a principal part enlarged view which shows the modification of the cap of FIG. 2, (b) is explanatory drawing which shows the preset of the cap of (a). (A) is sectional drawing which shows the cap single-piece | unit of FIG. 2, (b) is explanatory drawing which shows the state which laminated | stacked the cap of (a), (c) is the principal part enlarged view of (b). (A) is a longitudinal cross-sectional view which shows the modification of the pulsar ring of FIG. 2, (b) is an expanded sectional view of (a). (A) is sectional drawing which shows the pulsar ring single-piece | unit of FIG. 2, (b) is explanatory drawing which shows the state which laminated | stacked the pulsar ring of (a), (c) is the principal part enlarged view of (b). (A) is explanatory drawing which shows the precision of the cap of FIG. 2, (b) is explanatory drawing which shows the precision of the pulsar ring of FIG. It is a principal part enlarged view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. (A) is explanatory drawing which shows the preset of the cap of FIG. 9, (b) is explanatory drawing which shows the preset of the pulsar ring of FIG. (A) is explanatory drawing which shows the processing method of the outer member of FIG. 9, (b) is explanatory drawing which shows the processing method of the inner ring | wheel of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. (A) is a longitudinal cross-sectional view which shows the cap single-piece | unit of FIG. 10, (b) is a top view which shows the cap after press injection. It is explanatory drawing which shows the press-fit state of the cap of FIG.

  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 And a cup-shaped cap, through which the rotational speed sensor is opposed to the pulsar ring with a predetermined axial air gap, wherein the cap is on the inner side of the outer member. A cylindrical fitting portion that is press-fitted into the inner periphery of the end portion, a disc-shaped shielding portion that extends radially inward from the fitting portion, and an inner member of the inner member through a bent portion from the shielding portion. A cylindrical portion in which the fitting portion of the cap is metal-fitted to a fitting surface formed on the inner periphery of the end portion of the outer member, and a shaft extending from the cylindrical portion. An elastic member made of synthetic rubber is integrally joined to the outer peripheral surface of the reduced diameter portion by vulcanization adhesion, and has a diameter larger than the outer diameter of the cylindrical portion of the cap. With an annular protrusion protruding outward At the same time, a predetermined radial step is formed at the end of the cylindrical portion by pressing, the outer diameter is set smaller than the inner diameter of the fitting surface of the outer member, and the width of the step is It is set larger than the width of the chamfered portion at the inner diameter of the end of the outer member.

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 according to the present invention, FIG. 2 is an enlarged view of a main part showing a state where the cap and pulsar ring of FIG. 1 are attached, and FIG. ) Is an explanatory view showing a preset of the cap of FIG. 2, (b) is an explanatory view showing a preset of the pulsar ring of FIG. 2, and FIG. 4 (a) is an enlarged view of a main part showing a modified example of the cap of FIG. FIGS. 5A and 5B are explanatory views showing the preset of the cap of FIG. 5A, FIG. 5A is a cross-sectional view showing the single cap of FIG. 2, and FIG. 5B is a state in which the cap of FIG. FIG. 6C is an enlarged view of an essential part of FIG. 6B, FIG. 6A is a longitudinal sectional view showing a modification of the pulsar ring of FIG. 2, and FIG. 6B is an enlarged sectional view of FIG. FIG. 7A is a cross-sectional view showing the pulsar ring alone in FIG. 2, and FIG. Clear view, (c) is an enlarged view of the main part of (b), FIG. 8 (a) is an explanatory view showing the accuracy of the cap of FIG. 2, and (b) is an explanatory view showing the accuracy of the pulsar ring of FIG. It is. 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 shown in FIG. 1 is called the third generation on the driven wheel side, and is a double row housed between the inner member 1 and the outer member 2 and between the inner member 1 and the outer member 2. Rolling elements (balls) 3 and 3. 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 cap 10 is attached to the opening on the inner side. This prevents leakage of the enclosed lubricating grease to the outside and prevents rainwater and dust from entering the bearing from the outside.

  In this embodiment, the pitch circle diameter PCDo of the outer side rolling element 3 is set larger than the pitch circle diameter PCDi of the inner side rolling element 3 (PCDo> PCDi). Due to the difference between the pitch circle diameters PCDo and PCDi, the outer diameter of the outer rolling element 3 is set larger than the outer diameter of the inner rolling element 3, and the number of outer rolling elements 3 is the inner diameter. More than the number of rolling elements 3 on the side is set. As a result, the bearing space can be effectively utilized to increase the bearing rigidity of the outer side portion compared to the inner side, and the life of the bearing can be extended.

  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. A side lip 12a, a dust lip 12b, and a 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. Here, the dust lip 12b may be non-contact.

  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 surface 5b of the inner ring 5, and a vertical plate portion that extends radially outward from the fitting portion 14a. 14b. The magnetic encoder 15 is integrally joined to the inner side surface of the upright 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 cap 10 is press-fitted into the inner periphery of the inner side end of the outer member 2 to close the inner side opening of the outer member 2. The cap 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 cap 10 has 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 cap 10 has a slight axial clearance through the magnetic encoder 15. The disk-shaped shielding part 10b which opposes and the bottom part 10d which covers the edge part by the side of the inner member 1 from this shielding part 10b through the bending part 10c are provided.

  The detection part of the rotational speed sensor 16 is brought close to or in contact with the shielding part 10b of the cap 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 cap 10. . 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 10a of the cap 10 has a cylindrical portion 17 that is metal-fitted to a fitting surface 2c formed on the inner periphery of the inner side end of the outer member 2, and a shaft that extends from the cylindrical portion 17. It is comprised by the taper-shaped diameter reducing part 18 which inclines and extends in the 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 includes an annular protrusion 19 a that is formed so as not to protrude inward from the side surface of the shielding portion 10 b of the cap 10 and protrudes radially outward from the outer diameter of the cylindrical portion 17. The annular projection 19a is elastically deformed and pressure-bonded to the inner periphery of the end portion of the outer member 2 when the cap 10 is fitted, thereby improving the airtightness of the fitting portion 10a.

  Here, a step δ is formed in the end portion 17a of the cylindrical portion 17 of the fitting portion 10a by pressing, and the outer diameter d1 is smaller than the inner diameter d0 of the fitting surface 2c of the outer member 2 (d1 <d0). Is set to As a result, as shown in FIG. 3A, when the cap 10 is press-fitted into the outer member 2, the cap 10 can be preset in a centered state, and press-fitting and galling at the time of press-fitting the cap 10 occurs. Thus, it is possible to provide a wheel bearing device that improves the airtightness of the fitting portion and improves the press-fit workability. Note that the step δ of the end portion 17a of the cylindrical portion 17 is a guide clearance at the time of press-fitting, and therefore a range of 0.15 to 0.30 mm (0.30 to 0.60 mm in diameter) is preferable. If it is less than 0.15 mm, improvement in press-fit workability cannot be expected, and if it exceeds 0.30 mm, the strength of the end portion 17a of the cylindrical portion 17 may be reduced and plastic deformation may occur during press-fit.

  Further, the width L1 of the step δ of the end portion 17a of the cylindrical portion 17 is set to be larger than the width L2 of the chamfered portion 2d of the end portion inner diameter of the outer member 2 (L1> L2). Further, as shown in FIG. 8A, the press-fitting reference surface with respect to the cylindrical portion 17 serving as the fitting surface, that is, the surface runout of the shielding portion 10b is restricted to 0.15 mm or less. Thereby, when press-fitting the cap 10 into the outer member 2, it can be preset in a state in which the posture of the cap 10 is restricted, and press-fit workability can be further improved.

  In the manufacturing process, as shown in FIG. 5 (b), such a cap 10 is usually stored or waiting for a process in a stacked state so as not to take up installation space, but the stacked caps 10 fit into each other. In order to prevent this, as shown in (a), the inner diameter d2 of the end portion 17a of the cylindrical portion 17 in the fitting portion 10a is smaller than the outer diameter d3 of the elastic member 19 (d2 <d3). Is set to As a result, as shown in an enlarged view in (c), the end 17a of the cylindrical portion 17 abuts on the elastic member 19 reliably, and the workability in the manufacturing process of the laminated cap 10 can be improved.

  The shape for facilitating the preset when the cap 10 is press-fitted may be, for example, as shown in FIG. 4A other than the method of providing the step δ at the end portion 17a of the fitting portion 10a. That is, the cap 20 includes a cylindrical portion 17 in which the fitting portion 20 a is metal-fitted to a fitting surface 2 c formed on the inner periphery of the outer side of the outer member 2, and an axial direction from the cylindrical portion 17. The end portion 21 of the cylindrical portion 17 is a reduced-diameter portion having a reduced diameter. Thus, as in the above-described embodiment, as shown in (b), it is possible to preset the cap 20 in a state where the cap 20 is aligned without reducing the thickness of the fitting portion 20a and reducing the strength. Workability can be improved.

  On the other hand, as shown in FIG. 2, a step δ is formed by pressing at the end of the fitting portion 14a of the support ring 14 in the pulsar ring 13, and its inner diameter D1 is larger than the outer diameter D0 of the inner ring 5 (D1>). D0). As a result, as shown in FIG. 3B, when the pulsar ring 13 is press-fitted into the inner ring 5, the pulsar ring 13 can be preset in a state where the pulsar ring 13 is aligned, thereby preventing the occurrence of press-fitting scratches and galling when the pulsar ring 13 is pressed. Thus, it is possible to improve the air tightness of the fitting portion and improve the press-fit workability.

  Further, the width L3 of the step δ at the end of the fitting portion 14a is set to be larger than the width L4 of the chamfered portion 5c of the outer diameter of the end of the inner ring 5 (L3> L4). Further, as shown in FIG. 8B, the press-fitting reference surface with respect to the fitting portion 14a, that is, the perpendicularity of the magnetic encoder 15 is restricted to 0.30 mm or less. Thereby, when press-fitting the pulsar ring 13 into the inner ring 5, the pulsar ring 13 can be preset in a state in which the posture of the pulsar ring 13 is restricted, and the press-fit workability can be further improved.

  Further, like the cap 10, the pulsar ring 13 is usually stored in a state of being stacked or not waiting for a process so as not to take up installation space as shown in FIG. 7B. In order to prevent the pulsar rings 13 from fitting into each other, the outer diameter D2 of the fitting portion 14a is larger than the inner diameter D3 of the magnetic encoder 15 (D2> D3) as shown in FIG. Is set. As a result, as shown in an enlarged view in (c), the fitting portion 14a of the support ring 14 reliably contacts the magnetic encoder 15, and the workability in the manufacturing process of the laminated pulsar ring 13 can be improved. .

  FIG. 6A shows a modification of the pulsar ring 13 shown in FIG. The pulsar ring 22 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate or a cold-rolled steel plate that has been rust-prevented, in an L shape by pressing, and a support ring 23 that is formed in an annular shape as a whole. The magnetic encoder 24 is integrally joined to the support ring 23.

  The support ring 23 includes a cylindrical fitting portion 14a that is press-fitted into the outer diameter of the inner ring 5, and an upright plate portion 23a that extends radially inward from the fitting portion 14a, as shown in FIG. And. The magnetic encoder 24 is integrally joined to the inner side surface of the standing plate portion 23a by vulcanization adhesion. And the level | step difference (delta) is formed in the edge part of the fitting part 14a. In this embodiment, since the standing plate portion 23a is formed to extend radially inward from the fitting portion 14a, the pulsar rings 22 that are stacked can be fitted to each other without being limited in size while being compact. Can be prevented.

  FIG. 9 is an enlarged view of an essential part showing a second embodiment of the wheel bearing device according to the present invention, FIG. 10 (a) is an explanatory view showing a preset of the cap of FIG. 9, and FIG. FIG. 11A is an explanatory view showing a processing method of the outer member of FIG. 9, and FIG. 11B is an explanatory view showing a processing method of the inner ring of FIG. The same parts and parts as those of the above-described embodiment, parts and parts having similar functions, are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, a pulsar ring 26 is press-fitted into the outer diameter of the inner ring 25. The pulsar ring 26 is formed of a ferromagnetic steel plate, for example, a ferritic stainless steel plate or a cold-rolled steel plate that has been rust-proofed by pressing, and a support ring 27 that is formed in an annular shape as a whole. The magnetic encoder 15 is integrally joined to the support ring 27.

  The support ring 27 includes a cylindrical fitting portion 27a that is press-fitted into the outer diameter of the inner ring 25, and a standing plate portion 14b that extends radially outward from the fitting portion 27a. The magnetic encoder 15 is integrally joined to the inner side surface of the upright plate portion 14b by vulcanization adhesion.

  Further, a cap 29 is press-fitted into the inner periphery of the inner side end of the outer member 28 to close the inner side opening of the outer member 28. The cap 29 has a cylindrical fitting portion 29 a that is press-fitted into the inner periphery of the end of the outer member 28, and extends radially inward from the fitting portion 29 a via the reduced diameter portion 18. The disk-shaped shielding part 10b which opposes via a slight axial clearance, and the bottom part 10d which covers the inner side edge part of the inner member 1 from this shielding part 10b through the bending part 10c are provided.

  Here, in the present embodiment, a guide portion 28a having a predetermined step δ is formed on the inner periphery of the end portion of the outer member 28, and the inner diameter d4 thereof is larger than the outer diameter d5 of the fitting portion 29a of the cap 29 ( d4> d5) is set. Accordingly, as shown in FIG. 10A, when the cap 29 is press-fitted into the outer member 28, the cap 29 can be preset in a state of being aligned, and press-fitting damage and galling at the time of press-fitting the cap 29 occur. Thus, the airtightness of the fitting portion can be improved and the press-fit workability can be improved.

  In addition, as shown to Fig.11 (a), the connection surface 31 of the outer member 28 and the connection part 31 of the guide part 28a are formed in the circular arc shape which consists of predetermined curvature radius R1, and it fits with the outer side rolling surface 2a. The mating surface 2 c and the joint portion 31 are simultaneously ground by the general-purpose grindstone 30. Thereby, while improving a dimensional accuracy, both coaxiality becomes high and the workability | operativity of the press injection of the cap 29 can further be improved.

  On the other hand, as shown in FIG. 9, a guide portion 25a having a predetermined step δ is formed on the outer periphery of the end portion of the inner ring 25, and its outer diameter D4 is set to be smaller than the outer diameter D0 of the inner ring 25 (D4 <D0). Has been. Thus, as shown in FIG. 10B, when the pulsar ring 26 is press-fitted into the inner ring 25, the pulsar ring 26 can be preset with the core aligned, thereby preventing the occurrence of press-fitting scratches and galling during the press-fitting of the pulsar ring 26. Thus, it is possible to improve the air tightness of the fitting portion and improve the press-fit workability.

  In addition, as shown in FIG.11 (b), the outer diameter surface of the inner ring | wheel 25 and the connection part 32 of the guide part 25a are formed in the circular arc shape which consists of predetermined | prescribed curvature radius R1, and the inner side rolling surface 5a and the outer diameter surface 5b are formed. The joint portion 32 is simultaneously ground by the general-purpose grindstone 33. As a result, the dimensional accuracy is improved, the coaxiality between the two is increased, and the workability of press-fitting the pulsar ring 26 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 according to the present invention can be applied to an inner ring rotating type wheel bearing device for a driven wheel having a cap mounted on an end of an outer member.

DESCRIPTION OF SYMBOLS 1 Inner member 2, 28 Outer member 2a Outer rolling surface 2b Car body mounting flange 2c Outer member fitting surface 2d Chamfered portion of outer member 3 Rolling element 4 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step Portions 5 and 25 Inner ring 5b Inner ring outer diameter surface 5c Inner ring chamfer 6 Wheel mounting flange 6a Hub bolt 6b Inner side base 7 of the wheel mounting flange Clamping portion 8 Cage 9 Seals 10, 20, 29 Caps 10a, 14a, 20a, 27a, 29a Fitting portion 10b Shielding portion 10c Bending portion 10d Bottom 11 Core 12 Seal member 12a Side lip 12b Dustrip 12c Grease lip 13, 22, 26 Pulsar ring 14, 23, 27 Support ring 14b, 23a Standing plate portion 15 and 24 Magnetic encoder 16 Rotational speed sensor 17 Cylindrical portions 17a and 21 End portions 18 of the cylindrical portion Reduced diameter portion 19 Elastic member 1 a annular projections 25a and 28a guide portions 31 and 32 connecting portions 30 and 33 total grinding wheel 50 outer member 50a outer rolling surface 51 inner ring 51a inner rolling surface 52 ball 53 wheel mounting flange 54 axle shaft 55 fixing nut 56 shield 57 Seal 58 Brake pilot part 59 Wheel pilot part 60 Cap 60a Cylindrical part 60b Overlapping part 60c Bottom part 61 Claw part 62 Annular groove 63 Guide part 64 Press fit A Width of guide part d0 Inner diameter d1 of outer member fitting surface Cap cylinder The outer diameter d2 of the cap part The inner diameter d3 of the cylindrical part of the cap The outer diameter d4 of the elastic member The inner diameter d5 of the guide part of the outer member The outer diameter D0 of the fitting part of the cap The outer diameter D1 of the inner ring The fitting of the pulsar ring Inner part inner diameter D2 Pulsar ring fitting outer diameter D3 Magnetic encoder inner diameter D4 Inner ring guide outer diameter L1 Step width L2 at the end of the cap cylindrical portion L2 Width of the chamfered portion at the inner diameter of the outer member L3 Width of the step at the end of the pulsar ring cylindrical portion L4 Width of the chamfered portion at the end of the inner ring PCDi Inner side Pitch circle diameter PCDo of outer rolling element Pitch circle diameter R1 of outer rolling element R1 Curvature radius δ Step

Claims (17)

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;
In the wheel bearing device provided with a cup-shaped cap that is fitted to the inner side end of the outer member and formed by pressing from a steel plate,
The cap is a cylindrical fitting portion that is press-fitted into the inner periphery of the inner side end of the outer member, a disc-shaped shielding portion that extends radially inward from the fitting portion, and the shielding portion. And a bottom portion that covers the inner side end portion of the inner member via a bent portion, and a radial step is formed on one of the fitting surfaces of the cap and the outer member. A bearing device for a wheel.   The wheel bearing device according to claim 1, wherein the step is set in a range of 0.15 to 0.30 mm.   A cylindrical portion in which the fitting portion of the cap is metal-fitted to a fitting surface formed on the inner periphery of the end portion of the outer member, and a tapered diameter-reducing portion extending in an axial direction from the cylindrical portion. The said level | step difference is formed by press work in the edge part of the said cylindrical part, and the outer diameter is set to smaller diameter than the internal diameter of the fitting surface of the said outer member. Wheel bearing device.   A cylindrical portion in which the fitting portion of the cap is metal-fitted to a fitting surface formed on the inner periphery of the end portion of the outer member, and a tapered diameter-reducing portion extending in an axial direction from the cylindrical portion. The wheel bearing device according to claim 1, wherein an end portion of the cylindrical portion is a small-diameter portion having a diameter reduced by the step.   The elastic member which consists of synthetic rubber is integrally joined to the outer peripheral surface of the said diameter reduction part by vulcanization adhesion, The annular protrusion which protrudes in a radial direction outer side from the outer diameter of the cylindrical part of the said cap is provided. 4. A wheel bearing device according to 4.   The wheel bearing device according to claim 3 or 4, wherein an inner diameter of an end portion of the cylindrical portion of the cap is set to be smaller than an outer diameter of a side surface of the elastic member.   The wheel bearing device according to any one of claims 1 to 4, wherein a width of a step of the cap is set to be larger than a width of a chamfered portion of an inner diameter of an end portion of the outer member.   The wheel for a vehicle according to claim 1 or 2, wherein a guide portion including the step is formed on an inner periphery of an end portion of the outer member, and an inner diameter thereof is set larger than an outer diameter of a fitting portion of the cap. Bearing device.   The connecting portion of the outer member and the connecting portion of the guide portion are formed in an arc shape having a predetermined radius of curvature, and the outer rolling surface, the fitting surface, and the connecting portion are simultaneously ground by a general-purpose grindstone. The wheel bearing device according to claim 8.   The wheel bearing device according to claim 1, wherein a surface runout of the shielding portion with respect to the cylindrical portion of the cap is restricted to 0.15 mm or less.   A pulsar ring is externally fitted to the inner ring, the pulsar ring is formed by pressing from a steel plate, and a cylindrical fitting portion that is press-fitted into the outer diameter surface of the inner ring, and a vertical plate portion that extends radially from the fitting portion. And a magnetic encoder in which magnetic powder is mixed in the elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction. The rotational speed sensor is opposed to the magnetic encoder through the cap to a predetermined axial clearance, and either the fitting surface of the support ring or the inner ring is in the radial direction. The wheel bearing device according to claim 1, wherein a step is formed.   The wheel bearing device according to claim 11, wherein the step is formed by press working at an end of the fitting portion of the support ring, and an inner diameter thereof is set larger than an outer diameter of the inner ring.   The wheel bearing device according to claim 12, wherein a width of a step of the support ring is set to be larger than a width of a chamfered portion of an end outer diameter of the inner ring.   The wheel bearing device according to any one of claims 11 to 13, wherein a perpendicularity of the magnetic encoder with respect to the fitting portion of the support ring is restricted to 0.30 mm or less.   The wheel bearing device according to claim 11, wherein a guide portion including the step is formed on an outer periphery of an end portion of the inner ring, and an outer diameter thereof is set to be smaller than an outer diameter of the inner ring.   The wheel bearing device according to claim 11 or 12, wherein an outer diameter of the fitting portion of the support ring is set to be larger than an inner diameter of the magnetic encoder.   The connecting portion between the outer diameter surface of the inner ring and the guide portion is formed in a circular arc shape having a predetermined radius of curvature, and the inner rolling surface, the outer diameter surface and the connecting portion of the inner ring are simultaneously ground by a general grindstone. The wheel bearing device according to claim 15.

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