JP2013006488A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel in which a positioning means is provided at an inner member and assembling man-hours to a vehicle can be reduced.SOLUTION: In the bearing device for the wheel of a third-generation structure of an outer ring rotating type in which the pitch diameter PCDi of a rolling element 3 of an inner side among a plurality of rows of rolling elements 3 is set to be larger than the pitch diameter PCDo of a rolling element of an outer side, a substantially uniform thickness mounting part 21 having a recess 20 is formed at the inner side end of a hub wheel 4, a plurality of bolt holes 22 are formed at the mounting part 21, and the hub wheel 4 and a suspension device are fastened thereto with a fixing bolt, the suspension device and a positioning means 23 for performing positioning in the peripheral direction are formed at the mounting part 21 of the hub wheel 4, and the positioning means 23 is constituted of a planar part formed by partially cutting the outer periphery of an end of the mounting part 21.

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly to a so-called outer ring rotation type in which an outer member rotates together with the wheel, and a positioning means is provided on the inner member, and the assembly man-hour to the vehicle The present invention relates to a wheel bearing device in which the reduction of the above is achieved.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, the inner ring rotating type is generally used for driving wheels and the inner ring rotating and outer ring rotating types are generally used for driven wheels. Since the structure of the mounting portion can be simplified as compared with the inner ring rotating type, it is used as a wheel bearing device for supporting a driven wheel in some automobiles. However, since the outer member, which has a larger diameter than the inner member, is rotated, the moment of inertia is increased, which is disadvantageous compared to the inner ring rotating type in terms of ensuring driving performance and fuel efficiency performance centering on acceleration performance. Become. In order to reduce or eliminate such disadvantages, it is effective to reduce the weight of the outer member. As the outer ring rotating type wheel bearing device considered in view of such circumstances, structures as shown in FIGS. 19 and 20 are conventionally known.

  The wheel bearing device 100 includes an inner member 101, an outer member 102, a double row of balls 103, and a reinforcing member 104. Of these, the inner member 101 has double-row inner rolling surfaces 101a and 101b formed on the outer peripheral surface, and is supported and fixed to the suspension device in a use state and does not rotate. On the other hand, the outer member 102 integrally has a rotation-side flange 105 on the outer peripheral surface, and double row outer rolling surfaces 102a and 102b are formed on the inner peripheral surface. And it rotates with the wheel (not shown) couple | bonded and fixed to this wheel mounting flange 105 in use condition.

  The reinforcing member 104 has a partially conical cylindrical shape as a whole, with the large-diameter end on the outer peripheral edge of the rotation-side flange 105 and the small-diameter end on the outer peripheral surface of the outer member 102 more than the rotation-side flange 105. It is joined and fixed to the inner part in the axial direction by welding. Furthermore, in order to fix the inner member 101 to the suspension device, a stationary flange 106 is formed on the peripheral surface of the inner member 101.

  Here, when turning, for example, an input from a contact portion between the wheel and the road surface is applied to the rotation side flange 105 as a moment in a direction in which the rotation side flange 105 is bent with respect to the main body portion of the outer member 102. That is, since the reinforcing member 104 is provided between the rotation-side flange 105 and the main body portion of the outer member 102, the rotation-side flange 105 is prevented from bending with respect to the main body portion of the outer member 102 regardless of the moment. It is done. For this reason, even if the outer member 102 is thinned, it is possible to ensure the support rigidity of the wheels and ensure the required performance such as running stability (see, for example, Patent Document 1).

German Patent Application Publication No. 10 2007 060 627

  In such a wheel bearing device 100, a tap hole 108 for fastening the fixing bolt 107 is provided in the stationary side flange 106 of the inner member 101. When the fixing bolt 107 is assembled from the suspension device side, There was a problem that circumferential positioning with the member 101 was difficult.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a wheel bearing device in which positioning means is provided on an inward member to reduce the number of assembling steps for a vehicle.

  In order to achieve such an object, the invention according to claim 1 of the present invention has a wheel mounting flange for mounting a wheel on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. An outer member, an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction through a step portion inclined from the inner rolling surface. A back-to-back type double-row angular contact ball bearing is formed by press-fitting into the hub wheel and a small-diameter step portion of the hub ring, and forming the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery. An inner member formed of an inner ring, and a double row rolling element that is rotatably accommodated between both rolling surfaces of the inner member and the outer member, and the end portion of the small diameter step portion has a diameter. The inner ring is fixed in the axial direction by a caulking portion formed by plastic deformation outward in the direction. In the wheel bearing device in which a pitch circle diameter of the inner rolling element is set larger than a pitch circle diameter of the outer rolling element, a recess is formed at the inner end of the hub wheel. A mounting portion having a substantially uniform wall thickness is formed, and a plurality of bolt holes are formed in the mounting portion, and the hub wheel and the suspension device are fastened via fixing bolts. Positioning means for positioning the suspension device in the circumferential direction is formed at the end.

  As described above, the third generation structure wheel bearing of the outer ring rotating type in which the pitch circle diameter of the inner side rolling element of the double row rolling elements is set larger than the pitch circle diameter of the outer side rolling element. In the device, a mounting portion having a substantially uniform thickness having a recess at the end on the inner side of the hub wheel is formed, and a plurality of bolt holes are formed in the mounting portion so that the hub wheel and the suspension device are connected via a fixing bolt. And positioning means for positioning in the circumferential direction with the suspension device is formed at the end of the mounting portion of the hub wheel so that the circumferential positioning of the hub wheel and the suspension device can be easily performed. It is possible to provide a wheel bearing device that can be carried out and reduce the number of assembly steps for a vehicle.

  Further, as in a second aspect of the present invention, the positioning means may be provided on the outer periphery of the end of the mounting portion.

  Further, as in a third aspect of the present invention, the positioning means may be provided on the end surface of the mounting portion.

  Further, as in a fourth aspect of the present invention, the positioning means may be provided on the inner periphery of the end of the mounting portion.

  Further, as in the fifth aspect of the invention, if at least one engaging means is formed in the suspension device corresponding to the positioning means of the hub wheel, the circumferential direction between the hub wheel and the suspension device Positioning can be performed easily.

  Further, as in the invention described in claim 6, if the depth of the recess of the mounting portion is close to the shoulder portion where the inner ring is abutted, the weight of the hub wheel can be reduced while maintaining the strength. Can be planned.

  According to a seventh aspect of the invention, the outer member has an outer outer rolling surface on the outer side of the double row outer rolling surface due to the difference in pitch circle diameter. The outer rolling surface on the inner side is formed through a step portion that is formed with a diameter smaller than that of the rolling surface and is inclined from the outer rolling surface on the outer side, and the inclination angle of the step portion is If the angle is set to be substantially the same as the inclination angle of the stepped portion of the hub wheel, the conflicting problems of lightening, compactness and high rigidity of the device can be solved.

  Further, as in the invention described in claim 8, if the number of the inner side rolling elements among the double row rolling elements is set to be larger than the number of the outer side, the bearing space is effectively utilized. Compared to the outer side, the bearing rigidity of the inner side portion can be increased, and the life of the bearing can be extended.

  Further, as in the ninth aspect of the present invention, if a bolt hole into which the hub bolt is press-fitted and fixed is formed in the wheel mounting flange and a thick rib is formed around the bolt hole, the outer side The member can be reduced in weight and rigidity, and sufficient strength can be secured even when a large bending moment load is applied to the wheel mounting flange.

  Further, as in the invention according to claim 10, the surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the inner rolling surface of the hub wheel to the outer peripheral surface of the small diameter step portion, If the caulking part is kept in the surface hardness after forging, the fretting resistance of the small diameter step part which becomes the fitting part of the inner ring is improved, and the caulking part is free from occurrence of minute cracks. The plastic working can be performed smoothly.

  The wheel bearing device according to the present invention integrally has a wheel mounting flange for mounting a wheel on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and the outer member on the outer periphery. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row, a small diameter step portion extending in the axial direction via a step portion inclined from the inner rolling surface, and the hub wheel An inner member consisting of an inner ring that is press-fitted into a small-diameter stepped portion and is formed on the outer periphery to form a back-to-back type double row angular contact ball bearing in which the other inner rolling surface facing the double row outer rolling surface is formed; The inner member and a double-row rolling element accommodated between the rolling surfaces of the outer member and the outer member so as to freely roll, and formed by plastically deforming the end portion of the small diameter step portion radially outward. The inner ring is fixed in the axial direction by the crimped portion, and the inner side of the double row rolling elements In the wheel bearing device in which the pitch circle diameter of the rolling elements is set to be larger than the pitch circle diameter of the outer rolling elements, the hub wheel has a substantially uniform thickness having a recess at the inner side end. A mounting portion is formed, a plurality of bolt holes are formed in the mounting portion, and the hub wheel and the suspension device are fastened via fixing bolts, and the suspension device and the periphery are attached to the end portion of the mounting portion of the hub wheel. Since the positioning means for positioning in the direction is formed, positioning of the hub wheel and the suspension device in the circumferential direction can be easily performed, and a wheel bearing device that reduces the number of assembly steps to the vehicle is provided. Can be provided.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a side view of FIG. (A) is a principal part enlarged view which shows the positioning means of FIG. 1, (b) is the arrow line view seen from the III direction of (a). (A) is a principal part enlarged view which shows the modification of FIG. 3, (b) is the arrow line view seen from the IV direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 3, (b) is the arrow line view seen from the V direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 3, (b) is the arrow line view seen from VI direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 3, (b) is the arrow line view seen from the VII direction of (a). It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a side view of FIG. (A) is a principal part enlarged view which shows the positioning means of FIG. 8, (b) is the arrow line view seen from the X direction of (a). (A) is a principal part enlarged view which shows the modification of FIG. 10, (b) is the arrow line view seen from the XI direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 10, (b) is the arrow line view seen from the XII direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 10, (b) is the arrow line view seen from the XIII direction of (a). (A) is a principal part enlarged view which shows the other modification of FIG. 10, (b) is the arrow line view seen from the XIV direction of (a). It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. FIG. 16 is a side view of FIG. 15. (A) is a principal part enlarged view which shows the positioning means of FIG. 15, (b) is the arrow line view seen from the XVII direction of (a). (A) is the principal part enlarged view which shows the modification of FIG. 17, (b) is the arrow line view seen from the XVIII direction of (a). It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. FIG. 20 is a perspective view of FIG. 19.

  An outer member integrally having a wheel mounting flange for mounting a wheel on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery, and the outer rolling surface of the double row on the outer periphery. One inner rolling surface and a hub wheel formed with a small-diameter step portion extending in the axial direction via a step portion inclined from the inner rolling surface, and a small-diameter step portion of the hub wheel are press-fitted and An inner member formed of an inner ring that forms a back-to-back type double row angular contact ball bearing in which the other inner rolling surface facing the outer surface of the double row is formed, and the inner member and the outer member The inner ring is axially formed by a crimping portion formed by plastically deforming an end portion of the small-diameter step portion radially outward. And the pitch circle diameter of the inner side rolling elements of the double row rolling elements is the outer In the wheel bearing device set to a diameter larger than the pitch circle diameter of the rolling element on the side, a mounting portion having a substantially uniform thickness having a recess at the end on the inner side of the hub wheel is formed. A plurality of bolt holes are formed in the section, and the hub wheel and the suspension device are fastened via fixing bolts, and a positioning means for positioning the suspension device and the circumferential direction is formed in the mounting portion of the hub wheel And this positioning means is comprised by the plane part formed by partially cutting the outer periphery of the edge part of the said attaching part.

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 a side view of FIG. 1, and FIG. 3 (a) is a main part showing positioning means of FIG. (B) is an arrow view seen from the III direction of (a), FIG. 4 (a) is an enlarged view of a main part showing a modification of FIG. 3, and (b) is an IV of (a). FIG. 5A is an enlarged view of a main part showing another modified example of FIG. 3, and FIG. 5B is an arrow view seen from the V direction of FIG. a) is an enlarged view of a main part showing another modified example of FIG. 3, (b) is an arrow view seen from the VI direction of (a), and FIG. 7 (a) is another modified example of FIG. (B) is an arrow view seen from the VII direction of (a). In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device is for a driven wheel called the third generation, and is an inner member 1 serving as a stationary member, an outer member 2 serving as a rotating member, and a rolling member between both members 1 and 2. It has double row rolling elements (balls) 3 and 3 which are accommodated freely. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The hub wheel 4 is formed with one (inner side) inner rolling surface 4a and a small-diameter stepped portion 4b extending in the axial direction from the inner rolling surface 4a via a stepped portion 7a. The inner ring 5 is formed with the other (outer side) inner raceway surface 5a on the outer periphery and is press-fitted into the small-diameter stepped portion 4b of the hub wheel 4 to form a back-to-back type double row angular contact ball bearing. The inner ring 5 is fixed in the axial direction by a caulking portion 8 formed by plastic deformation of the end portion of 4b. The inner ring 5 and the rolling element 3 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching.

  The hub wheel 4 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a surface hardness of 58 by induction hardening from the inner rolling surface 4a to the outer peripheral surface of the small diameter step portion 4b. Cured to a range of ~ 64 HRC. The caulking portion 8 is kept in the surface hardness after forging. As a result, the fretting resistance of the small-diameter stepped portion 4b serving as the fitting portion of the inner ring 5 is improved, and the plastic working of the crimped portion 8 can be performed smoothly without occurrence of minute cracks.

  The outer member 2 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end on the outer side, and a bolt hole 6a into which a hub bolt (not shown) is screwed and fixed by a screw. A thick rib 6b is formed around the bolt hole 6a. The rib 6b can reduce the weight and the rigidity of the outer member 2, and can secure sufficient strength even when a large bending moment load is applied to the wheel mounting flange 6.

  Further, on the inner periphery of the outer member 2, the outer side outer rolling surface 2 a facing the inner rolling surface 5 a of the inner ring 5, and the hub wheel 4 from the outer rolling surface 2 a via the stepped portion 7 b. An inner side outer rolling surface 2b facing the inner rolling surface 4a is integrally formed. Double-row rolling elements 3 and 3 are accommodated between these rolling surfaces and are held by the cages 9 and 10 so as to roll freely. The outer member 2 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 2a and 2b have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range.

  A seal 11 which will be described later is attached to the opening on the inner side of the annular space formed between the outer member 2 and the inner member 1, and leakage of grease sealed inside the bearing to the outside and from the outside Rain water and dust are prevented from entering the bearing. A pulsar ring 12 is attached to the inner side end of the outer member 2. The pulsar ring 12 includes a cored bar 13 and a magnetic encoder 14 that is integrally joined to the cored bar 13 by vulcanization adhesion.

  The core 13 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 or the like), or a rust-proof cold-rolled steel plate, and the cross-section is substantially L-shaped by pressing. A cylindrical fitting portion 13a that is formed and press-fitted into the outer periphery of the end portion of the outer member 2, and extends radially inward from the fitting portion 13a and is in close contact with the inner end surface 2c of the outer member 2. And a flange 13b that increases positioning accuracy. The magnetic encoder 14 is 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 alternately magnetizing magnetic poles N and S in the circumferential direction. . In addition, although the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, not only this but the double row tapered roller bearing which uses the tapered roller for the rolling element 3 may be sufficient.

  As shown in an enlarged view in FIG. 3A, the seal 11 is configured by a so-called pack seal including a slinger 15 and an annular seal plate 16 that are arranged to face each other. The slinger 15 is a steel plate having rust prevention capability, for example, an austenitic stainless steel plate (JIS standard SUS304 type or the like), a ferritic stainless steel plate (JIS standard SUS430 type or the like), or a rust-proof cold rolled steel. A cross section is formed in a substantially L shape by pressing from a steel plate, and includes a cylindrical portion 15a that is press-fitted into the outer diameter of the hub wheel 4, and a standing plate portion 15b that extends radially outward from the cylindrical portion 15a.

  On the other hand, the seal plate 16 includes a cored bar 17 fitted into the inner end of the outer member 2 and a seal member 18 integrally joined to the cored bar 17 by vulcanization adhesion. The metal core 17 has a substantially L-shaped cross section formed by press working from an austenitic stainless steel plate or a cold-rolled steel plate that has been rust-proofed.

  The seal member 18 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), extends in a radially outward direction, and slides on a side surface on the outer side of the standing plate portion 15b of the slinger 15 via a predetermined axial shimiro. It has a side lip 18a in contact with it, a duster lip 18c and a grease lip 18c that extend in a forked manner on the inner diameter side and slidably contact the cylindrical portion 15a of the slinger 15 via a predetermined radial shimiro. As the material of the seal member 18, in addition to the exemplified NBR, for example, HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc. having excellent heat resistance, heat resistance, chemical resistance, etc. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in the above.

  In the present embodiment, as shown in FIG. 1, the pitch circle diameter PCDo of the outer side rolling element 3 is set to be smaller than the pitch circle diameter PCDi of the inner side rolling element 3 (PCDo <PCDi). The sizes of the double-row rolling elements 3 and 3 are the same, but due to the difference in the pitch circle diameters PCDo and PCDi, the number of the inner-side rolling elements 3 is set larger than the number of the outer-side rolling elements 3. Has been.

  The outer shape of the hub wheel 4 includes a counter portion 19 from the groove bottom portion of the inner rolling surface 4a, a step portion 7a formed to be inclined from the counter portion 19, and a shoulder portion 4c with which the inner ring 5 is abutted. It continues to the small diameter step 4b. On the other hand, the outer member 2 is formed such that the outer rolling surface 2a on the outer side has a smaller diameter than the outer rolling surface 2b on the inner side due to the difference in pitch circle diameters PCDo and PCDi. An inner side outer rolling surface 2b is formed via a step 7b inclined from the running surface 2a. The inclination angle of the step portion 7 b is set to be substantially the same as the inclination angle of the step portion 7 a of the hub wheel 4.

  In the wheel bearing device having such a configuration, the pitch circle diameter PCDo of the outer side rolling element 3 is set to be smaller than the pitch circle diameter PCDi of the inner side rolling element 3, and the number of the rolling elements 3 is also increased accordingly. Since the number of bearings is set to be larger than the number on the outer side, the bearing space can be effectively utilized to increase the bearing rigidity of the inner side portion compared to the outer side, thereby extending the life of the bearing. it can. Furthermore, since the inclination of the step portion 7a of the hub wheel 4 and the step portion 7b of the outer member 2 are set to substantially the same angle, it is possible to solve the conflicting problems of lightening, compactness and high rigidity of the device. it can.

  Here, an attachment portion 21 having a mortar-shaped recess 20 is formed at the inner end of the hub wheel 4. The depth of the recess 20 is up to the vicinity of the shoulder 4c, and the mounting portion 21 of the hub wheel 4 has a substantially uniform thickness. Thereby, weight reduction can be achieved, maintaining the intensity | strength of the hub ring 4. FIG. In the present embodiment, a plurality of bolt holes 22 are formed in the mounting portion 21 and are attached to a knuckle (not shown) constituting the suspension device by a fixing bolt (not shown) fastened to the bolt holes 22. And the positioning means 23 with a knuckle is formed in the outer periphery of the edge part of the attachment part 21 of the hub ring 4. As shown in FIG.

  As shown in FIGS. 2 and 3, the positioning means 23 is composed of a flat portion formed by partially cutting the outer periphery of the end portion of the attachment portion 21 of the hub wheel 4. And at least one plane part is formed also in the inner circumference of the other party knuckle, and by positioning these plane parts, the positioning in the circumferential direction of the hub wheel 4 and the knuckle can be easily performed. It is possible to provide a wheel bearing device that reduces the number of assembly steps for a vehicle.

  FIG. 4 shows a modification of the positioning means 23 described above. An annular groove 25 is formed on the outer periphery of the end portion of the attachment portion 21 of the hub wheel 4, and the positioning means 24 is constituted by a convex portion that protrudes from the bottom of the annular groove 25. And at least one recessed part is formed also in the inner periphery of the other party knuckle, and the circumferential positioning of the hub wheel 4 and the knuckle can be easily performed by fitting these unevenness | corrugation, The number of assembly steps can be reduced.

  FIG. 5 shows another modification of the positioning means 23 described above. A perforation 26 is formed on the outer periphery of the end of the attachment portion 21 of the hub wheel 4, and the positioning means 27 is configured by a pin press-fitted into the perforation 26 so that the head protrudes. And at least one recessed part is formed also in the inner periphery of the other party knuckle, and the circumferential positioning of the hub wheel 4 and a knuckle can be performed easily by engaging a pin with this recessed part.

  FIG. 6 shows another modification of the positioning means 23 described above. The positioning means 28 is constituted by a recess formed on the outer periphery of the end portion of the attachment portion 21 of the hub wheel 4. And at least 1 convex part is formed also in the inner periphery of the other party knuckle, and the positioning of the hub ring 4 and the knuckle in the circumferential direction can be performed easily by fitting this unevenness | corrugation.

  FIG. 7 shows another modification of the positioning means 23 described above. A concave portion 29 is formed on the outer periphery of the end portion of the mounting portion 21 of the hub wheel 4, and the positioning means 30 is constituted by a key member fitted into the concave portion 29. Further, at least one key groove is also formed on the inner periphery of the partner knuckle, and the key member can be engaged with the key groove, thereby easily positioning the hub wheel 4 and the knuckle in the circumferential direction. it can.

  8 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 9 is a side view of FIG. 8, and FIG. 10 (a) is a main part showing the positioning means of FIG. Enlarged view, (b) is an arrow view seen from the X direction of (a), FIG. 11 (a) is an enlarged view of a main part showing a modification of FIG. 10, and (b) is an XI of (a). FIG. 12A is an enlarged view of a main part showing another modified example of FIG. 10, FIG. 12B is an arrow view seen from the XII direction of FIG. a) is an enlarged view of a main part showing another modification of FIG. 10, (b) is an arrow view seen from the XIII direction of (a), and FIG. 14 (a) is another modification of FIG. (B) is an arrow view seen from the XIV direction of (a). The second embodiment is basically the same as the above-described first embodiment (FIG. 1) except that the positioning means is different, and the same parts or parts having the same function or the same function. Reference numerals are assigned and detailed description is omitted.

  The wheel bearing device includes an inner member 31, an outer member 2, and double-row rolling elements 3 and 3 accommodated between the members 31 and 2 so as to freely roll. The inner member 31 includes a hub ring 32 and an inner ring 5 that is press-fitted into the hub ring 32 via a predetermined shimiro.

  The hub wheel 32 is formed on the outer periphery with one (inner side) inner rolling surface 4a and a small-diameter stepped portion 4b extending from the inner rolling surface 4a in the axial direction via a stepped portion 7a. The hub ring 32 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface hardness is increased by induction hardening from the inner rolling surface 4a to the outer peripheral surface of the small diameter step portion 4b. Curing treatment is performed in the range of 58 to 64 HRC.

  Here, an attachment portion 33 having a mortar-shaped recess 20 is formed at the inner end of the hub wheel 32. The depth of the recess 20 is up to the vicinity of the shoulder 4c, and the mounting portion 33 of the hub wheel 32 has a substantially uniform thickness. In this embodiment, a knuckle positioning means 34 is formed on the inner side end face of the mounting portion 33 of the hub wheel 32.

  As shown in FIGS. 9 and 10, the positioning means 34 is constituted by a convex portion that is formed to project from the end surface of the mounting portion 33 of the hub wheel 32. At least one recess is formed on the end surface of the mating knuckle. By fitting these recesses and protrusions, the hub wheel 32 and the knuckle can be easily positioned in the circumferential direction, and assembled into the vehicle. Man-hours can be reduced.

  FIG. 11 shows a modification of the positioning means 34 described above. The positioning means 35 is constituted by a perforation formed on the end surface of the attachment portion 33 of the hub wheel 32. And at least one convex part is formed also in the inner periphery of the other side knuckle, and the positioning of the circumferential direction of the hub wheel 32 and a knuckle can be performed easily by fitting these unevenness | corrugations, and to a vehicle. The number of assembly steps can be reduced.

  FIG. 12 shows another modification of the positioning means 34 described above. A perforation 36 is formed on the end surface of the mounting portion 33 of the hub wheel 32, and the positioning means 37 is configured by a pin press-fitted into the perforation 36. And at least one recessed part is formed also in the inner periphery of the other party knuckle, and the positioning of the circumferential direction of the hub wheel 32 and a knuckle can be performed easily by fitting these unevenness | corrugation, The number of assembly steps can be reduced.

  FIG. 13 shows another modification of the positioning means 34 described above. The positioning means 38 is configured by a radial groove formed on the end surface of the mounting portion 33 of the hub wheel 32. And at least one convex part is formed also in the inner periphery of the other party knuckle, and the hub ring 32 and the knuckle are easily positioned in the circumferential direction by being engaged with the positioning means 38 formed of the radiation groove. This can reduce the number of assembly steps for the vehicle.

  FIG. 14 shows another modification of the positioning means 34 described above. A radial groove 39 is formed on the end surface of the mounting portion 33 of the hub wheel 32, and the positioning means 40 is composed of a key member fixed to the radial groove 39. Further, at least one key groove is also formed on the inner periphery of the knuckle on the other side, and by fitting these irregularities, the circumferential positioning of the hub wheel 32 and the knuckle can be easily performed, and the vehicle The number of assembly steps can be reduced.

  15 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention, FIG. 16 is a side view of FIG. 15, and FIG. 17 (a) is a main part showing the positioning means of FIG. Enlarged view, (b) is an arrow view seen from the XVII direction of (a), FIG. 18 (a) is an enlarged view of a main part showing a modification of FIG. 17, and (b) is an XVIII of (a). It is an arrow view seen from the direction. The third embodiment is basically the same as the above-described first embodiment (FIG. 1) except that the positioning means is different, and the same parts or parts having the same function or the same function. Reference numerals are assigned and detailed description is omitted.

  The wheel bearing device includes an inner member 41, an outer member 2, and double-row rolling elements 3 and 3 accommodated between the members 41 and 2 so as to freely roll. The inner member 41 includes a hub ring 42 and an inner ring 5 that is press-fitted into the hub ring 42 through a predetermined shimiro.

  The hub wheel 42 is formed with one (inner side) inner rolling surface 4a and a small-diameter stepped portion 4b extending in the axial direction from the inner rolling surface 4a via the stepped portion 7a. The hub wheel 42 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface hardness is increased by induction hardening from the inner rolling surface 4a to the outer peripheral surface of the small diameter step portion 4b. Curing treatment is performed in the range of 58 to 64 HRC.

  Here, an attachment portion 43 having a mortar-like recess 20 is formed at the inner end of the hub wheel 42. The depth of the recess 20 is up to the vicinity of the shoulder 4c, and the mounting portion 43 of the hub wheel 42 has a substantially uniform thickness. In the present embodiment, a knuckle positioning means 44 is formed on the inner diameter surface of the mounting portion 43 of the hub wheel 42.

  As shown in FIGS. 16 and 17, the positioning means 44 is constituted by a convex portion formed so as to protrude from the inner diameter surface of the mounting portion 43 of the hub wheel 42. Then, at least one recess is formed in the mating knuckle. By fitting these irregularities, the circumferential positioning of the hub wheel 42 and the knuckle can be easily performed, and the assembly man-hour for the vehicle can be reduced. Reduction can be achieved.

  FIG. 18 shows a modification of the positioning means 44 described above. The positioning means 45 is constituted by a recess formed on the inner diameter surface of the mounting portion 43 of the hub wheel 42. And at least one convex part is formed in the other side knuckle, and the positioning of the circumferential direction of the hub wheel 42 and the knuckle can be easily performed by fitting these unevenness | corrugations, and the assembly man-hour to a vehicle can be carried out. Reduction can be achieved.

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

  The wheel bearing device according to the present invention can be applied to a third-generation outer ring rotation type wheel bearing device.

DESCRIPTION OF SYMBOLS 1, 31, 41 Inner member 2 Outer member 2a, 2b Outer rolling surface 2c End surface of inner side of outer member 3 Rolling elements 4, 32, 42 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step 4c Shoulder part 5 Inner ring 6 Wheel mounting flange 6a, 22 Bolt hole 6b Rib 7a, 7b Step part 8 Clamping part 9, 10 Cage 11 Seal 12 Pulsar ring 13, 17 Core metal 13a Fitting part 13b Hook part 14 Magnetic encoder 15 Slinger 15a Cylindrical portion 15b Standing plate portion 16 Sealing plate 18 Sealing member 18a Side lip 18b Dustrip 18c Grease lip 19 Counter portion 20 Recesses 21, 33, 43 Mounting portions 23, 24, 27, 28, 30, 34, 35, 37, 38, 40, 44, 45 Positioning means 25 Annular groove 26, 36 Perforation 29 Recess 39 Radiation groove 100 Wheel bearing device 101 Inner member 1 01a, 101b Inner rolling surface 102 Outer member 102a, 102b Outer rolling surface 103 Ball 104 Reinforcement member 105 Rotating side flange 106 Stationary side flange 107 Fixing bolt 108 Tap hole PCDi Pitch circle diameter of the inner side rolling element PCDo Outer side Pitch circle diameter of rolling element

Claims (10)

An outer member integrally having a wheel mounting flange for mounting a wheel on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A hub wheel formed on the outer periphery with one inner rolling surface facing the outer rolling surface of the double row, and a small-diameter step portion extending in the axial direction via a step portion inclined from the inner rolling surface, and An inner ring composed of an inner ring that is press-fitted into a small-diameter step portion of the hub wheel and forms a back-to-back type double-row angular contact ball bearing with the other inner rolling face facing the outer rolling face of the double-row. Members,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
The inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward,
In the wheel bearing device in which the pitch circle diameter of the inner side rolling elements of the double row rolling elements is set larger than the pitch circle diameter of the outer side rolling elements,
A mounting portion having a substantially uniform thickness having a recess at the inner end of the hub wheel is formed, and a plurality of bolt holes are formed in the mounting portion so that the hub wheel and the suspension device are connected via a fixing bolt. A wheel bearing device, characterized in that it is fastened and has positioning means for positioning in the circumferential direction with respect to the suspension device at the end of the mounting portion of the hub wheel.   The wheel bearing device according to claim 1, wherein the positioning means is provided on an outer periphery of an end portion of the attachment portion.   The wheel bearing device according to claim 1, wherein the positioning means is provided on an end surface of the mounting portion.   The wheel bearing device according to claim 1, wherein the positioning means is provided on an inner periphery of an end of the mounting portion.   The wheel bearing device according to any one of claims 1 to 4, wherein at least one engaging means is formed in the suspension device corresponding to the positioning means of the hub wheel.   The wheel bearing device according to claim 1, wherein a depth of the recess of the attachment portion is set to a vicinity of a shoulder portion where the inner ring is abutted.   The outer member is formed such that the outer rolling surface on the outer side among the outer rolling surfaces of the double row is reduced in diameter than the outer rolling surface on the inner side, with the difference in pitch circle diameter, The outer rolling surface on the inner side is formed through a step portion inclined from the outer rolling surface on the outer side, and the inclination angle of the step portion is substantially the same as the inclination angle of the step portion of the hub wheel. The wheel bearing device according to claim 1, wherein the wheel bearing device is set to be.   The wheel bearing device according to claim 1, wherein the number of inner side rolling elements of the double row rolling elements is set to be larger than the number of outer side rolling elements.   The wheel bearing device according to claim 1, wherein a bolt hole into which a hub bolt is press-fitted and fixed is formed in the wheel mounting flange, and a thick rib is formed around the bolt hole.   The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the inner rolling surface of the hub wheel to the outer peripheral surface of the small diameter step portion, and the crimped portion remains the surface hardness after forging. The wheel bearing device according to claim 1, wherein

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