JP2008018759A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of reducing hoop stress acting on an outside diameter of an inner wheel, and securing sufficiently bearing strength without increasing the thickness of the inner wheel in a radial direction and a width direction. <P>SOLUTION: This device comprises a plurality of arrays of rolling elements 5 intervened between trajectory faces 3 and 4 of an outer member 1 and an inner member 2. The inner member comprises a hub wheel 9 having a solid shaft 9b and a flange 9a, and two inner wheels 10A, 10B pressure-fit in the outer periphery of the shaft and having trajectory faces on inboard and outboard sides. A hole 9d is formed at the inboard side end face of the shaft, and the width face of the inner wheel on the inboard side is fastened in an axial direction by a clamping part 9e clamping a cylindrical portion of the outer periphery of the hole toward the outside diameter. A straight line L1 extending in a direction perpendicular to a trajectory face from the center of the axial direction on the trajectory face of the inner wheel on the inboard side is located on the inboard side beyond a position P1 crossing with a fitting face between the outer periphery of the hub wheel and the inner wheel, and a bottom position of the hole is positioned on the outboard side beyond the end face on the inboard side of the inner wheel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wheel bearing device in an automobile or the like, and more particularly to a wheel bearing device in which one or two inner rings are press-fitted into a hub wheel.

In the wheel bearing device in which the inner ring is press-fitted into the hub ring, hoop stress, that is, stress that is pulled in the circumferential direction is applied to the raceway surface and the outer diameter surface of the inner ring. In particular, in a type in which a caulking portion is provided on the inboard side end of the hub wheel and the inner ring is tightened in the axial direction with respect to the hub wheel (for example, Patent Document 1), the outer diameter surface of the hub wheel is increased by caulking. For this reason, the hoop stress acting on the outer diameter portion of the inner ring further increases. When the hoop force acting on the outer diameter portion of the inner ring becomes extremely high, the durability of the inner ring is lowered.
Therefore, in the caulking type wheel bearing device, the hoop stress is reduced by increasing the thickness of the inner ring in the radial direction and the width direction.
JP-A-11-129703

  However, in the caulking type wheel bearing device, when the inner ring is thickened in the radial direction or axial direction, there is a design that increases the shaft diameter of the hub ring in order to secure the hub ring strength. Necessary. Therefore, it becomes an impediment to reducing the cost by reducing the material.

  An object of the present invention is to provide a wheel bearing device that can reduce the hoop stress acting on the outer diameter portion of the inner ring without increasing the thickness in the radial direction and width direction of the inner ring, and can secure sufficient bearing strength. It is.

  A wheel bearing device according to a first aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a double row of rolling elements interposed between the outer member and the raceway surface of the inner member, the inner member, A hub wheel having a solid shaft portion and the flange and a single inner ring having a race surface on the inboard side that is press-fitted into the outer periphery of the shaft portion of the hub ring, or a race surface on the inboard side and the outboard side. The inboard is composed of two inner rings each having a hole formed in the end surface on the inboard side of the shaft portion of the hub ring, and the cylindrical portion of the outer periphery of the hole is crimped to the outer diameter side. In the wheel bearing device in which the width surface of the inner ring on the side is tightened in the axial direction, A straight line extending from the axial center of the raceway surface of the inner ring on the inboard side to a direction perpendicular to the raceway surface of the inner ring is a fit between the outer peripheral surface of the hub wheel and the inner ring. It is characterized in that it is located on the inboard side from the position where it meets the mating surface and located on the outboard side from the end face on the inboard side of this inner ring.

In such a caulking type wheel bearing device, the hoop stress is highest due to the press-fitting of the inner ring on the inboard side and the caulking of the hub ring in the vicinity of the end face on the inboard side of the outer diameter surface of the inner ring. . According to the present invention, the bottom surface position of the hole on the end surface of the hub wheel is located on the outboard side with respect to the end surface on the inboard side of the inner ring. That is, the hole is positioned directly below the end surface of the inner ring. As described above, the hole is provided immediately below the inner ring end surface corresponding to the position where the hoop stress is highest, thereby suppressing the expansion amount of the end of the inner ring outer diameter surface caused by press-fitting and caulking. And hoop stress can be reduced. The action line, which is a straight line extending from the center in the axial direction of the raceway surface, which is the action point of the inner ring on the inboard side, in a direction perpendicular to the raceway surface of the inner race is a fit between the outer peripheral surface of the hub wheel and the inner race. There is a bottom surface position of the hole portion on the inboard side from a position intersecting the surface. That is, the hole is not opened immediately below the intersection of the line of action of the inner ring and the outer peripheral surface of the hub ring. Therefore, even if the hole is provided, the bearing has sufficient strength.
For this reason, the hoop stress acting on the outer diameter portion of the inner ring can be reduced without increasing the thickness in the radial direction and width direction of the inner ring, and sufficient bearing strength can be ensured.

  In this invention, the wheel bearing device may be a tapered roller bearing type, and the double row raceway surfaces of the inner member may be conical surfaces whose end portions on the side away from each other are on the large diameter side.

In the present invention, the bottom surface position of the hole portion of the hub wheel may be located on the outboard side by 3 mm or more from the end surface of the inboard side inner ring on the inboard side.
Since the hoop stress acting on the outer diameter of the inner ring is highest at the inboard side end of the inboard side inner ring as described above, the outboard is 3 mm or more out of the end surface on the inboard side of the inboard side inner ring. When the position on the side is the bottom surface position of the hole portion of the hub ring, the effect of reducing the hoop stress acting on the outer diameter portion of the inner ring can be further enhanced.

  A wheel bearing device according to a second aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a plurality of rolling elements interposed between the outer member and the raceway surface of the inner member. The raceway surface of the row is a conical surface whose end portions on the side away from each other are on the large diameter side, and the inner member is a hub shaft having a solid shaft portion and the flange, and an outer periphery of the shaft portion of the hub ring. One inner ring having a raceway surface on the inboard side that is press-fitted into the inner ring, or two inner rings each having a raceway surface on the inboard side and the outboard side, and a hole is formed in the end surface on the inboard side of the shaft portion of the hub ring. Caulking with a cylindrical part on the outer periphery of the hole In the tapered roller bearing type wheel bearing device in which the width surface of the inner ring on the inboard side is tightened in the axial direction, the bottom surface position of the hole of the hub ring is on the large diameter side of the raceway surface of the inner ring on the inboard side The straight line extending in a direction perpendicular to the raceway surface of the inner ring from the end is on the inboard side from the position where the outer peripheral surface of the hub ring and the fitting surface of the inner ring intersect, and the inboard side of the inner ring It is located on the outboard side from the end face.

  In the case of a tapered roller bearing type wheel bearing device, as in this configuration, the bottom surface position of the hole portion of the hub ring moves from the large-diameter end of the race surface of the inner ring on the inboard side to the race surface of the inner ring. The straight line extending in a direction perpendicular to the inner ring is located on the inboard side from the position where the outer peripheral surface of the hub wheel and the inner ring meet, and is located on the outboard side from the end surface on the inboard side of the inner ring. In this case, the hoop stress acting on the outer diameter portion of the inner ring can be reduced without increasing the thickness in the radial direction and the width direction of the inner ring, and sufficient bearing strength can be ensured. Further, in the case of this configuration, since the bottom surface position of the hole portion of the hub wheel is biased toward the inboard side as compared with the case of the wheel bearing device according to the first invention, more sufficient bearings are provided. Strength can be secured.

  In the second invention, the bottom surface position of the hole of the hub wheel may be located on the outboard side by 3 mm or more from the end surface on the inboard side of the inboard side inner ring. In the case of this configuration, the effect of reducing the hoop stress acting on the outer diameter portion of the inner ring can be further enhanced.

  A wheel bearing device according to a first aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a double row of rolling elements interposed between the outer member and the raceway surface of the inner member, the inner member, A hub wheel having a solid shaft portion and the flange and a single inner ring having a race surface on the inboard side that is press-fitted into the outer periphery of the shaft portion of the hub ring, or a race surface on the inboard side and the outboard side. The inboard is composed of two inner rings each having a hole formed in the end surface on the inboard side of the shaft portion of the hub ring, and the cylindrical portion of the outer periphery of the hole is crimped to the outer diameter side. In the wheel bearing device in which the width surface of the inner ring on the side is tightened in the axial direction, A straight line extending from the axial center of the raceway surface of the inner ring on the inboard side to a direction perpendicular to the raceway surface of the inner ring is a fit between the outer peripheral surface of the hub wheel and the inner ring. Because it is located on the inboard side from the position where it meets the mating surface and on the outboard side from the end surface on the inboard side of the inner ring, without increasing the thickness in the radial direction or width direction of the inner ring The hoop stress acting on the outer diameter portion of the inner ring can be reduced, and sufficient bearing strength can be ensured.

  A wheel bearing device according to a second aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a plurality of rolling elements interposed between the outer member and the raceway surface of the inner member. The raceway surface of the row is a conical surface whose end portions on the side away from each other are on the large diameter side, and the inner member is a hub shaft having a solid shaft portion and the flange, and an outer periphery of the shaft portion of the hub ring. One inner ring having a raceway surface on the inboard side that is press-fitted into the inner ring, or two inner rings each having a raceway surface on the inboard side and the outboard side, and a hole is formed in the end surface on the inboard side of the shaft portion of the hub ring. Caulking with a cylindrical part on the outer periphery of the hole In the tapered roller bearing type wheel bearing device in which the width surface of the inner ring on the inboard side is tightened in the axial direction, the bottom surface position of the hole of the hub ring is on the large diameter side of the raceway surface of the inner ring on the inboard side The straight line extending in a direction perpendicular to the raceway surface of the inner ring from the end is on the inboard side from the position where the outer peripheral surface of the hub ring and the fitting surface of the inner ring intersect, and the inboard side of the inner ring Because it is located on the outboard side from the end face, the hoop stress acting on the outer diameter part of the inner ring can be reduced without increasing the thickness in the radial direction and width direction of the inner ring, and sufficient bearing strength is also ensured. be able to.

A first embodiment of the present invention will be described with reference to FIGS. This embodiment is an inner ring rotating type and is applied to a wheel bearing device for supporting a driven wheel. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.
The wheel bearing device includes an outer member 1 having double-row raceway surfaces 3 on the inner periphery, an inner member 2 having double-row raceway surfaces 4 facing the raceway surfaces 3 on the outer periphery, The rolling element 5 includes a double row of rolling elements 5 interposed between the raceway surfaces 3 and 4 of the side member 1 and the inward member 2, and supports the wheel rotatably with respect to the vehicle body. This wheel bearing device is a tapered roller bearing type in which the rolling elements 5 are tapered rollers, and the double row raceway surfaces 4 of the inner member 2 are tapered surfaces whose end portions on the side away from each other are on the large diameter side. ing. The rolling elements 5 are held by a holder 6 for each row. The bearing spaces between the outer member 1 and the inner member 2 are sealed by seals 7 and 8, respectively.

The outer member 1 is an integral part as a whole as a member on the fixed side, and is attached to a suspension device (not shown) of the vehicle body via another member fitted on the outer member 1.
The inner member 2 is a member on the rotation side, and has a hub wheel 9 having a wheel mounting flange 9 a on the outer periphery of the outboard side end, and an outer periphery of the solid shaft portion 9 b of the hub wheel 9. The two inner rings 10A and 10B are arranged in the axial direction and fitted in a press-fitted state. The raceway surfaces 4 of each row are formed on the outer periphery of the two rows of inner rings 10A and 10B. The inner rings 10 </ b> A and 10 </ b> B, the outer member 1, and the rolling elements 5 constitute a bearing independent of the hub ring 9.

  A pilot portion 9c for guiding a wheel and a brake rotor (both not shown) protrudes from the side surface on the outboard side at the base end of the flange 9a of the hub wheel 9. A hole 9d is provided in the end surface on the inboard side of the shaft portion 9b of the hub wheel 9, and an inner ring on the inboard side is formed by a caulking portion 9e obtained by caulking the cylindrical portion of the outer periphery of the hole 9d to the outer diameter side. The 10B width surface is tightened in the axial direction. A step surface 9f facing in the axial direction is provided in the vicinity of the flange 9a of the hub wheel 9, and the two rows of inner rings fitted to the shaft portion 9b of the hub wheel 9 by the step surface 9f and the caulking portion 9e. 10A and 10B are clamped and fixed in the axial direction.

  FIG. 2 shows an enlarged view of part A in FIG. As shown in the figure, the bottom surface position of the hole 9d of the hub wheel 9 is a straight line extending perpendicularly to the raceway surface 4 of the inner ring 10B from the axial center of the raceway surface 4 of the inner ring 10B on the inboard side. The line of action L1 is on the inboard side from the position P1 at which the outer peripheral surface of the hub wheel 9 and the fitting surface of the inner ring 10B intersect, and in the range W1 on the outboard side from the end surface on the inboard side of the inner ring 10B. It is located in.

In such a caulking type wheel bearing device, the hoop stress is highest on the outer diameter surface of the inner ring 10B due to the press-fitting of the inner ring 10B on the inboard side and the caulking portion 9e of the hub ring 9. Near the end face on the inboard side. In this embodiment, the bottom surface position of the hole 9d on the end surface of the hub wheel 9 is positioned on the outboard side with respect to the end surface on the inboard side of the inner ring 9B. That is, the hole 9d is located immediately below the end face of the inner ring 10B. Thus, by providing the hole 9d immediately below the inner ring end surface corresponding to the position where the hoop stress is highest, the expansion amount of the outer diameter surface end portion of the inner ring 10B caused by press-fitting and caulking can be reduced. It becomes possible to suppress the hoop stress. The bottom surface position of the hole 9d of the hub wheel 9 is a straight line L1 extending perpendicularly to the raceway surface 4 of the inner ring 10B from the center in the axial direction of the raceway surface 4 as the action point of the inner ring 10B on the inboard side. The action line is located on the inboard side from the position P1 where the outer peripheral surface of the hub wheel 9 and the fitting surface of the inner ring 10B intersect. That is, the hole 9d is not opened immediately below the intersection P1 between the straight line L1 serving as the action line of the inner ring 10B and the outer peripheral surface of the hub ring. Therefore, even if the hole 9d is provided, the bearing has sufficient strength.
For this reason, the hoop stress acting on the outer diameter portion of the inner ring 10B can be reduced without increasing the thickness in the radial direction and the width direction of the inner ring 10B, and sufficient bearing strength can be ensured.

  In FIG. 2, the inboard side limit position of the bottom surface of the hole 9d of the hub wheel 9 is simply set to the outboard side from the end surface on the inboard side of the inner ring 10B, but the hoop stress acting on the outer diameter portion of the inner ring 10B is It becomes the highest at the inboard side end of the inner ring 10B. For this reason, as shown in FIG. 3, the position on the outboard side of 3 mm or more from the end surface on the inboard side of the inner ring 10 </ b> B is more preferably the inboard side limit position on the bottom surface of the hole 9 d of the hub wheel 9. Thereby, the reduction effect of the hoop stress which acts on the outer diameter part of the inner ring 10B can be further enhanced.

  Further, in FIG. 2, the outboard side limit position of the bottom surface of the hole 9d of the hub wheel 9 is shifted from the center in the axial direction of the raceway surface 4 which is the point of action of the inner ring 10B on the inboard side to the raceway surface 4 of the inner ring 10B. A straight line L1 extending perpendicularly to the right side is on the inboard side from the position P1 where the outer peripheral surface of the hub wheel 9 and the fitting surface of the inner ring 10B intersect. Further, as shown in FIG. 4, a straight line L <b> 2 extending in a direction perpendicular to the raceway surface 4 of the inner ring 10 </ b> B from the end on the large diameter side of the raceway surface 4 of the inner ring 10 </ b> B on the inboard side is The position on the inboard side with respect to the position intersecting the fitting surface with the inner ring 10B may be set as the outboard side limit position on the bottom surface of the hole 9d of the hub wheel 9. In this case, since the bottom surface position of the hole 9d of the hub wheel 9 is more biased toward the inboard side than in the case of FIG. 2, a sufficient bearing strength can be secured.

  In the example of FIG. 5, in the configuration example of FIG. 4, the position on the outboard side of 3 mm or more from the end surface on the inboard side of the inner ring 10 </ b> B is the inboard side limit position on the bottom surface of the hole 9 d of the hub wheel 9. Thereby, more sufficient bearing strength can be ensured, and the effect of reducing the hoop stress acting on the outer diameter portion of the inner ring 10B can be further increased.

  In the above-described embodiment, the second-generation type wheel bearing device in which the two inner rings 10A and 10B are fitted to the hub wheel 9 is described. However, in the present invention, the inner member is a hub ring. The present invention can also be applied to a third-generation type wheel bearing device including an inner ring in an inboard side row. Further, in the case of the example shown in FIGS. 1 to 3, the present invention can be applied not only to the tapered roller bearing type but also to an angular ball bearing type wheel bearing device. In that case, in the configuration of FIG. 2, “the center in the axial direction of the raceway surface 4 of the inner ring 10 </ b> B” is a contact point with the rolling element 5 (ball), and “perpendicular to the raceway surface 4 of the inner ring 10 </ b> B”. “Straight line L1” extends to the normal line of the inner ring raceway surface.

It is sectional drawing of the wheel bearing apparatus concerning 1st Embodiment of this invention. It is an expanded sectional view of the A section in FIG. It is sectional drawing which shows the other structural example of A part. It is sectional drawing which shows the further another structural example of the A section. It is sectional drawing which shows the further another structural example of the A section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 3, 4 ... Raceway surface 5 ... Rolling element 9 ... Hub wheel 9a ... Wheel mounting flange 9b ... Shaft part 9d ... Hole 9e ... Clamping part 10A, 10B ... Inner ring

The first wheel bearing device according to the invention of the invention includes an outer member attached to the vehicle body has a raceway surface of the double row on the inner periphery (3) (1), facing the raceway surfaces (3) An inner member (2) having a double-row raceway surface (4) on the outer periphery and a wheel mounting flange (9a) on the outer periphery of the outboard side end, the outer member (1) and the inner member ( 2) and the double row rolling elements (5) interposed between the raceway surfaces (3) and (4) , and the inner member (2) includes a solid shaft (9b) and the flange (9a ). the shaft portion of the hub wheel (9) and wheel hub (9) having a) (one of the inner ring (10B having the outer periphery press-fitted into the inboard side of the raceway surface of 9b) and (4)), or inboard side And two inner rings (10B) each having a raceway surface (4) on the outboard side, and the shaft portion (9b) of the hub wheel (9 ) An inner ring (10B) on the inboard side is formed by a caulking portion (9e) in which a hole portion (9d) is provided in the end surface on the inboard side and a cylindrical portion on the outer periphery of the hole portion (9d) is caulked to the outer diameter side. In the angular ball bearing type wheel bearing device in which the width surface of the hub ring (9) is tightened in the axial direction, the position of the bottom surface of the hole (9d) of the hub wheel (9 ) is the point of contact with the rolling element (5) on the inboard side. pressurized et al., located in the outer peripheral surface inboard side of the inner ring position intersecting the mating surface between (10B) (P1) of the normal hub wheel raceway surface (4) (9) of the inner ring (10B), And it is located in the outboard side rather than the end surface by the side of the inboard of this inner ring | wheel (10B) , It is characterized by the above-mentioned.

In such a caulking type wheel bearing device, the hoop stress is highest due to the press-fitting of the inner ring on the inboard side and the caulking of the hub ring in the vicinity of the end face on the inboard side of the outer diameter surface of the inner ring. . According to the present invention, the bottom surface position of the hole on the end surface of the hub wheel is located on the outboard side with respect to the end surface on the inboard side of the inner ring. That is, the hole is positioned directly below the end surface of the inner ring. As described above, the hole is provided immediately below the inner ring end surface corresponding to the position where the hoop stress is highest, thereby suppressing the expansion amount of the end of the inner ring outer diameter surface caused by press-fitting and caulking. And hoop stress can be reduced. The contact point or these rolling elements that Do and an inner ring of the point on the inboard side, the inboard than the position intersecting the mating surface between the outer peripheral surface and the inner ring of the normal hub wheel raceway surface of the inner ring On the side, there is a bottom position of the hole. That is, the hole is not opened immediately below the intersection of the line of action of the inner ring and the outer peripheral surface of the hub ring. Therefore, even if the hole is provided, the bearing has sufficient strength.
For this reason, the hoop stress acting on the outer diameter portion of the inner ring can be reduced without increasing the thickness in the radial direction and width direction of the inner ring, and sufficient bearing strength can be ensured.

Wheel bearing device according to the second aspect of the invention, an outer member attached to the vehicle body has a raceway surface of the double row on the inner periphery (3) (1), facing the raceway surfaces (3) An inner member (2) having a double-row raceway surface (4) on the outer periphery and a wheel mounting flange (9a) on the outer periphery of the outboard side end, the outer member (1) and the inner member ( 2) and the double row rolling elements (5) interposed between the raceway surfaces (3) and (4) , and the double row raceway surfaces (4) of the inner member (2) are at the ends on the side away from each other. The inner member (2) includes a hub wheel (9) having a solid shaft portion (9b) and the flange (9a) , and the hub wheel (9) . One inner ring (10B) press-fitted into the outer periphery of the shaft portion (9b) and having a raceway surface (4) on the inboard side, or the inboard side and the outboard side Of it out with two inner rings (10B) having raceway surfaces (4), respectively, wherein the hole in the hole on the inboard side end face (9d) provided in the shaft portion (9b) of the hub (9) (9d In the tapered roller bearing type wheel bearing device in which the width surface of the inner ring (10B) on the inboard side is tightened in the axial direction by the crimping portion (9e) that crimps the cylindrical portion of the outer periphery to the outer diameter side, The bottom surface of the hole (9d) of the hub wheel (9) is provided perpendicular to the axial direction, and the position of the bottom surface of the hole (9d ) is large on the raceway surface (4) of the inner ring (10B) on the inboard side. A straight line (L1) extending in a direction perpendicular to the raceway surface (4 ) of the inner ring (10B) from the radial end intersects the fitting surface between the outer peripheral surface of the hub ring (9) and the inner ring (10B). position is in the inboard side than (P1), and Au from the end face on the inboard side of the inner ring (10B) Characterized in that positioned on the board side.

A wheel bearing device according to a first aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a double row of rolling elements interposed between the outer member and the raceway surface of the inner member, the inner member, A hub wheel having a solid shaft portion and the flange and a single inner ring having a race surface on the inboard side that is press-fitted into the outer periphery of the shaft portion of the hub ring, or a race surface on the inboard side and the outboard side. The inboard is composed of two inner rings each having a hole formed in the end surface on the inboard side of the shaft portion of the hub ring, and the cylindrical portion of the outer periphery of the hole is crimped to the outer diameter side. wheel angular ball bearing type tightening the width surface of the inner ring side in the axial direction In receiving apparatus, the fitting surface of the position of the bottom face of the hole portion of the hub wheel, the contact point or these rolling elements of the inboard side, the normal line of the raceway surface of the inner ring and the outer peripheral surface and the inner ring of the hub wheel The inner ring is located on the inboard side of the inner ring and on the outboard side of the end surface on the inboard side of the inner ring, so that the inner ring does not increase in thickness in the radial direction and width direction of the inner ring. The hoop stress acting on the outer diameter portion can be reduced, and sufficient bearing strength can be secured.

A wheel bearing device according to a second aspect of the present invention has an outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, and a double-row raceway surface facing the raceway surface on the outer periphery. An inner member having a wheel mounting flange on the outer periphery of the outboard side end, and a plurality of rolling elements interposed between the outer member and the raceway surface of the inner member. The raceway surface of the row is a conical surface whose end portions on the side away from each other are on the large diameter side, and the inner member is a hub shaft having a solid shaft portion and the flange, and an outer periphery of the shaft portion of the hub ring. One inner ring having a raceway surface on the inboard side that is press-fitted into the inner ring, or two inner rings each having a raceway surface on the inboard side and the outboard side, and a hole is formed in the end surface on the inboard side of the shaft portion of the hub ring. Caulking with a cylindrical part on the outer periphery of the hole In in the inboard wheel bearing apparatus of the tapered roller bearing type tightened axially width surface of the inner ring, provided perpendicular to the bottom surface of the hole portion of the hub wheel in the axial direction, of the hole (9d) The position where the bottom surface position extends from the end on the large diameter side of the raceway surface of the inner ring on the inboard side in a direction perpendicular to the raceway surface of the inner ring and the fitting surface between the outer peripheral surface of the hub ring and the inner ring The outer diameter of the inner ring without increasing the wall thickness in the radial direction or width direction of the inner ring. The hoop stress acting on the portion can be reduced, and sufficient bearing strength can be secured.

Bearing device for a vehicle wheel of the invention, an outer member attached to the vehicle body has a raceway surface of the double row on the inner periphery (3) (1), raceways double row facing the raceway surfaces (3) An inner member (2) having (4) on the outer periphery and a wheel mounting flange (9a) on the outer periphery of the outboard side end, and the raceway surfaces of the outer member (1) and the inner member (2) (3), (4) and a double row rolling element (5) interposed between them, and the double row raceway surface (4) of the inner member (2) has a larger diameter end on the side away from each other And the inner member (2) includes a hub wheel (9) having a solid shaft portion (9b) and the flange (9a), and the shaft portion (9b) of the hub wheel (9). ) Or an inner ring (10B) having an inboard side raceway surface (4), or inboard side and outboard side raceway surfaces (4). Each of the two inner rings (10B) has a hole (9d) on the end face on the inboard side of the shaft (9b) of the hub ring (9), and a cylinder on the outer periphery of the hole (9d). In the tapered roller bearing type wheel bearing device in which the width surface of the inner ring (10B) on the inboard side is tightened in the axial direction by a caulking portion (9e) that caulks the outer portion toward the outer diameter side, the hub wheel (9 ) Of the hole (9d) is provided perpendicular to the axial direction, and the position of the bottom surface of the hole (9d) is from the large-diameter side end of the raceway surface (4) of the inner ring (10B) on the inboard side. From the position (P1) where the straight line (L1) extending in a direction perpendicular to the raceway surface (4) of the inner ring (10B) intersects the fitting surface between the outer peripheral surface of the hub ring (9) and the inner ring (10B). position is also in the inboard side and the outboard side than the end face on the inboard side of the inner ring (10B) , The axial length of the large rib of the inner ring (10B), and wherein to Rukoto shorter than the axial length of the raceway surface of the inner ring (10B) (4).

Car wheel bearing apparatus of the present invention, the inner and outer member attached to the vehicle body has a raceway surface of the double rows in the circumferential outboard end has the outer peripheral raceway surfaces of the double row facing the raceway surfaces An inner member having a wheel mounting flange on the outer periphery of the inner member, and a double row rolling element interposed between the outer member and the inner member raceway surface. The end portions that are separated from each other are conical surfaces that have a large-diameter side, and the inner member is pressed into the outer periphery of the hub portion having a solid shaft portion and the flange and the shaft portion of the hub ring. One inner ring having a raceway surface on the board side, or two inner races each having a raceway surface on the inboard side and the outboard side, and a hole is provided in the end surface on the inboard side of the shaft portion of the hub ring. The above-mentioned inboard is formed by a caulking portion in which a cylindrical portion on the outer periphery of the hole portion is caulked to the outer diameter side. In the tapered roller bearing type wheel bearing device in which the width surface of the inner ring on the side is tightened in the axial direction, the bottom surface of the hole portion of the hub wheel is provided perpendicular to the axial direction, and the bottom surface position of the hole portion (9d) is The inboard side has a straight line extending from the end on the large diameter side of the raceway surface of the inner ring at a right angle to the raceway surface of the inner ring. located side, and to position the outboard side than the end face of the inner ring of the inboard side, the axial length of the large rib of the inner ring (10B), the raceway surface of the inner ring (10B) (4) since the axial length shorter to shall than is, without increasing the thickness in the radial direction and the width direction of the inner ring, can be reduced hoop stress acting on the inner ring of the outer diameter portion, also to ensure sufficient bearing strength Can do.

In the above-described embodiment, the second-generation type wheel bearing device in which the two inner rings 10A and 10B are fitted to the hub wheel 9 is described. However, in the present invention, the inner member is a hub ring. The present invention can also be applied to a third-generation type wheel bearing device including an inner ring in an inboard side row .

Claims (5)

An outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, a double-row raceway surface facing the raceway surface on the outer periphery, and a wheel mounting flange on the outer periphery of the outboard side end An inner member, and a double-row rolling element interposed between the outer member and the raceway surface of the inner member, the inner member having a solid shaft portion and the flange having the flange and the hub A shaft portion of the hub wheel, comprising one inner ring having a raceway surface on the inboard side that is press-fitted into the outer periphery of the shaft portion of the ring, or two inner races each having a raceway surface on the inboard side and the outboard side. A bearing device for a wheel in which a hole is provided in an end surface on the inboard side and a width portion of the inner ring on the inboard side is tightened in an axial direction by a crimping portion in which a cylindrical portion on the outer periphery of the hole is crimped to the outer diameter side In
A straight line extending from the axial center of the raceway surface of the inner ring on the inboard side to a direction perpendicular to the raceway surface of the inner ring is formed between the outer peripheral surface of the hub wheel and the inner ring. A wheel bearing device, wherein the wheel bearing device is located on an inboard side with respect to a position intersecting with the fitting surface and on an outboard side with respect to an end surface on the inboard side of the inner ring.   2. The wheel bearing device according to claim 1, which is a tapered roller bearing type, wherein the double-row raceway surfaces of the inner member are conical surfaces whose end portions on the side away from each other are on the large diameter side.   3. The wheel bearing device according to claim 1, wherein a bottom surface position of the hole of the hub wheel is 3 mm or more on an outboard side of an inboard side end surface of an inboard side inner ring. An outer member having a double-row raceway surface on the inner periphery and attached to the vehicle body, a double-row raceway surface facing the raceway surface on the outer periphery, and a wheel mounting flange on the outer periphery of the outboard side end An inner member, and a double row rolling element interposed between the outer member and the raceway surface of the inner member, and the double row raceway surface of the inner member has a large-diameter end on the side away from each other One inner ring having a raceway surface on the inboard side, the inner member being a hub ring having a solid shaft portion and the flange, and a hub ring press-fitted into the outer periphery of the shaft portion of the hub ring. Or two inner rings each having an inboard side and an outboard side raceway surface. A hole is provided in the end surface on the inboard side of the shaft portion of the hub wheel, and the cylindrical portion on the outer periphery of the hole is removed. The width of the inner ring on the inboard side is tightened in the axial direction with the crimped part crimped to the radial side. In the bearing device for a wheel with a tapered roller bearing type,
The bottom surface position of the hole portion of the hub ring is a straight line extending in a direction perpendicular to the raceway surface of the inner ring from the end on the large diameter side of the raceway surface of the inner ring on the inboard side. A wheel bearing device, wherein the wheel bearing device is located on an inboard side with respect to a position intersecting with a fitting surface of the inner ring and on an outboard side with respect to an end surface on the inboard side of the inner ring.   5. The wheel bearing device according to claim 4, wherein the bottom surface position of the hole portion of the hub wheel is located on the outboard side by 3 mm or more from the end surface on the inboard side of the inboard side inner ring.

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