JP6649611B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device for supporting wheels of an automobile or the like. More specifically, the present invention relates to a structure of a sealing member for sealing between an inner ring member and an outer ring.

  A wheel of an automobile or the like is generally supported by a wheel bearing device. For example, Patent Literature 1 discloses a wheel bearing device including a hub wheel having a flange, an inner ring, an outer ring, a plurality of rolling elements, and a retainer. In Patent Document 1, the hub wheel and the inner ring rotate integrally. A raceway surface on which the rolling elements roll is formed on each of the outer peripheral surface of the hub wheel and the outer peripheral surface of the inner ring. The outer ring is fitted on the outer peripheral surfaces of the hub wheel and the inner ring. Two rows of raceway surfaces are formed on the inner peripheral surface of the outer race. The plurality of rolling elements are arranged in a space between the raceway surface of the hub wheel and the raceway surface of the outer ring, and in a space between the raceway surface of the inner ring and the raceway surface of the outer ring. The retainer holds the plurality of rolling elements such that the plurality of rolling elements are arranged at a predetermined interval.

  Grease is sealed in a space where a plurality of rolling elements are held. In order to prevent the grease in this space from leaking to the outside, and to prevent moisture or dust from entering the space from the outside, the space between the outer ring and the flange of the hub ring and between the outer ring and the inner ring Each of the spaces is provided with an annular sealing member.

  FIG. 9 is an enlarged view of a sealing member provided between the outer ring 902 and the hub wheel 904 in the wheel bearing device of Patent Document 1. The sealing member includes a metal core 913 and a sealing member 914 made of an elastic body. The core metal 913 and the seal member 914 are pressed into the inner peripheral surface of the outer ring 902. The seal member 914 has side lips 914a and 914b for suppressing intrusion of moisture and dust from the outside, and a grease slip 914c for suppressing leakage of grease to the outside. In FIG. 9, reference numeral 903 denotes a rolling element.

  An annular slinger 912 is fitted on the surface 906c of the flange 906 of the hub wheel 904 and the surface of the outer peripheral surface 904e of the hub wheel 904. The slinger 912 includes a cylindrical portion 912a along the outer peripheral surface 904e of the hub wheel 904 and an annular portion 912c along the surface 906c of the flange 906. The slinger 912 is formed of a metal such as stainless steel.

  Each of the side lips 914a, 914b and the grease slip 914c is in contact with the surface of the slinger 912. Since each of the side lips 914a, 914b and the grease slip 914c is in direct contact with the surface of the slinger 912 without directly contacting the hub wheel 904, wear of the hub wheel 904 due to rotation of the side lip 914a, 914b and the grease slip 914c is reduced. Is suppressed.

  If the wheel bearing device repeatedly receives the load or vibration from the wheel, the load or vibration is transmitted to the slinger 912, and the slinger 912 may move (walk out) in the axial direction. When the slinger 912 moves in the axial direction, the slinger 912 may come into contact with the rolling elements 903. In order to prevent the movement of the slinger 912 in the axial direction, the wheel bearing device of Patent Document 1 has a projection-shaped retaining portion 916 between the slinger 912 and the rolling element 903 on the outer peripheral surface of the hub wheel 904. Is provided.

JP 2014-240679 A

  By the way, when the slinger 912 is press-fitted into the hub wheel 904, if the press-fit is applied to the annular portion 912c of the slinger 912 which is far from the press-fit surface 912d, the slinger 912 may be deformed. Therefore, it is preferable to apply a press force to the cylindrical portion 912a of the slinger 912.

  In the wheel bearing device described in Patent Document 1, as shown in FIG. 9, a state is shown in which the slinger 912 is designed not to move in the axial direction when the slinger 912 exceeds the retaining portion 916. However, from the viewpoint of processing accuracy, it is difficult to design the slinger 912 so as not to move in the axial direction as shown in FIG. For this reason, the axial size of the surface of the flange of the hub wheel and the retaining portion is designed to be slightly larger than the axial size of the slinger.

  As described above, when the axial size of the surface of the flange of the hub wheel and the retaining portion is designed to be slightly larger than the axial size of the slinger, even if the slinger exceeds the retaining portion, Further, it is necessary to press-fit the slinger toward the outer side. If the axial end of the cylindrical part of the slinger exceeds the retaining part, the end of the slinger overlaps with the retaining part when viewed from the axial direction, making it difficult to apply pressure input to the end of the slinger. become.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing device having a structure capable of easily press-fitting a slinger while suppressing movement of the slinger in the axial direction.

  A bearing device of the present invention that solves the above-mentioned problem includes an annular small-diameter portion and an annular large-diameter portion having a radius larger than the small-diameter portion, and a first raceway surface is formed on an outer peripheral surface of the small-diameter portion. The formed inner race member, the second raceway surface facing the first raceway surface are formed on the inner peripheral surface, and the outer race provided to cover the small diameter portion of the inner race member; the first raceway surface; A plurality of rolling elements arranged in a space between the second raceway surface and a connecting surface between the small diameter portion and the large diameter portion of the inner ring member, and a step surface extending in a direction perpendicular to the axial direction; An annular sealing member that is provided in contact with the outer peripheral surface of the portion and seals a space between the inner ring member and the outer ring. The sealing member includes a slinger fitted to the small diameter portion of the inner ring member and a seal member fitted to the outer ring. The slinger has an annular first portion extending in a direction perpendicular to the axial direction while contacting the step surface, a cylindrical second portion contacting the outer peripheral surface of the small diameter portion, and a radially outward portion of the second portion. And a positioned cylindrical third part. Either the second part or the third part of the slinger has a shape that is continuous with the radially inner end of the first part and extends in the axial direction in a direction away from the large diameter part. An end of the second portion of the slinger opposite to the large diameter portion in the axial direction is continuous with an end of the third portion of the third portion opposite to the large diameter portion in the axial direction. The small-diameter portion of the inner ring member includes, on the outer peripheral surface, a convex portion formed between the end of the second portion of the slinger opposite to the large-diameter portion in the axial direction and the first raceway surface.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing device of the structure which can press-fit a slinger easily can be obtained, suppressing the movement of a slinger in the axial direction.

FIG. 1 is a cross-sectional view of the wheel bearing device according to the first embodiment. FIG. 2 is an enlarged sectional view showing the periphery of the sealing member in FIG. FIG. 3 is a diagram illustrating a state where a slinger is fitted to the inner ring member. FIG. 4 is a diagram illustrating a state where a slinger is fitted to the inner ring member. FIG. 5 is an enlarged cross-sectional view illustrating a periphery of a sealing member of the wheel bearing device according to the second embodiment. FIG. 6 is an enlarged cross-sectional view showing a periphery of a sealing member of a wheel bearing device according to a first modification. FIG. 7 is an enlarged cross-sectional view showing a periphery of a sealing member of a wheel bearing device according to a second modification. FIG. 8 is an enlarged cross-sectional view showing the periphery of a sealing member of a wheel bearing device according to a third modification. FIG. 9 is an enlarged sectional view showing a periphery of a sealing member of a conventional wheel bearing device.

  A bearing device of the present invention that solves the above-mentioned problem includes an annular small-diameter portion and an annular large-diameter portion having a radius larger than the small-diameter portion, and a first raceway surface is formed on an outer peripheral surface of the small-diameter portion. The formed inner race member, the second raceway surface facing the first raceway surface are formed on the inner peripheral surface, and the outer race is provided so as to cover the small diameter portion of the inner race member. A plurality of rolling elements disposed in a space between the second raceway surface and a connecting surface between the small diameter portion and the large diameter portion of the inner ring member, and a step surface extending in a direction perpendicular to the axial direction; An annular sealing member that is provided in contact with the outer peripheral surface of the portion and seals a space between the inner ring member and the outer ring. The sealing member includes a slinger fitted to the small diameter portion of the inner ring member and a seal member fitted to the outer ring. The slinger has an annular first portion that extends in a direction perpendicular to the axial direction while contacting the step surface, a cylindrical second portion that contacts the outer peripheral surface of the small diameter portion, and a radially outward portion of the second portion. And a positioned cylindrical third part. Either the second part or the third part of the slinger has a shape that is continuous with the radially inner end of the first part and extends in the axial direction in a direction away from the large diameter part. An end of the second portion of the slinger opposite to the large diameter portion in the axial direction is continuous with an end of the third portion of the third portion opposite to the large diameter portion in the axial direction. The small-diameter portion of the inner ring member includes, on the outer peripheral surface, a convex portion formed between an end of the second portion of the slinger opposite to the large-diameter portion in the axial direction and the first raceway surface.

  According to the above configuration, of the outer peripheral surface of the small diameter portion of the inner ring member, the convex portion is formed between the end of the second portion of the slinger opposite to the large diameter portion in the axial direction and the first raceway surface. Is formed, the movement of the slinger in the axial direction is restricted, and the contact of the slinger with the rolling element is suppressed.

  Further, according to the above configuration, when the slinger is press-fitted into the inner race member, the press-fit can be applied to a continuous portion of the second part and the third part of the slinger. In the process of press-fitting the slinger, if at least a part of the slinger is present in the axial direction at a position closer to the first raceway surface than the convex portion or at a position overlapping with the convex portion, the inner periphery of the second portion of the slinger is provided. The surface is press-fitted while being in contact with the outer peripheral surface of the projection. That is, the press-fitting operator can apply a press-fit to the entire continuous portion of the second part and the third part to stably move the slinger in the axial direction.

  In the process of press-fitting the slinger, when the entire slinger moves in the axial direction to the larger-diameter portion side than the convex portion, the operator sees from the axial direction, and The slinger is moved in the axial direction while applying a pressure input to a portion not hidden by the convex portion. Therefore, the area of the portion to which the press-in can be applied is smaller than at least a part of the slinger is present on the first track surface side of the convex portion in the axial direction or at a position overlapping the convex portion. . However, according to the above configuration, since the slinger has the third portion in addition to the second portion in contact with the inner ring member, a sufficient area for the press-fitting operation remains even if the portion for applying the press-fit is hidden by the convex portion. It will be.

  Therefore, according to the above configuration, even when at least a part of the slinger is present in the axial direction on the first track surface side with respect to the convex portion or at a position overlapping with the convex portion, the entire slinger is in the axial direction. The slinger can be easily pressed into the inner ring member even when the slinger moves toward the larger diameter portion than the convex portion in the direction.

  The outer peripheral surface of the second part of the slinger of the bearing device of the present invention is preferably in contact with the inner peripheral surface of the third part.

  The radially inner end of the first part of the slinger of the bearing device of the present invention is preferably continuous with the axially larger end of the second part.

  In the bearing device of the present invention, a difference between a distance between an outer peripheral surface of the small-diameter portion and an outer peripheral surface of the third portion in a radial direction and a radial height of the convex portion is equal to a difference between the second portion of the slinger and the second portion of the slinger. It is preferably larger than the size in the radial direction.

  In the bearing device, since the convex portion is formed on the outer peripheral surface of the inner ring member, when the slinger is fitted into the inner ring member, after the slinger moves to the larger diameter portion side than the convex portion, the second portion and the second portion of the slinger are moved. Some of the three parts are hidden by the convex parts. Therefore, when the slinger is press-fitted, the portion where the operator press-fits is reduced. According to the above configuration, after the slinger moves to the larger-diameter portion side than the convex portion, even if a part of the second portion and the third portion of the slinger is hidden by the convex portion, the second portion and the third portion are removed. The radial size of a portion of the slinger that is not hidden by the convex portion is larger than the radial size of the second portion of the slinger. Therefore, even after the slinger has moved to the larger-diameter portion side than the convex portion, it is possible to sufficiently secure a portion where the worker press-fits the slinger. Therefore, according to the above configuration, the workability of manufacturing the bearing device can be improved.

  In the case where the seal member of the bearing device of the present invention includes a radial lip that projects radially inward and contacts the outer peripheral surface of the third portion so that the tip faces the large diameter side in the axial direction, It is preferable that the part and the third part are continuous via a curved surface.

  The step of manufacturing the bearing device includes a step of fitting the outer ring to which the seal member is fixed so as to cover the outer periphery of the small diameter portion of the inner ring member to which the slinger is fixed. According to the above configuration, a continuous portion of the second part and the third part of the slinger has a curved surface. Therefore, when the outer ring is fitted so as to cover the small diameter portion of the inner ring member, even if the seal member includes the radial lip, the radial lip is inverted by the continuous portion of the second portion and the third portion of the slinger. Can be suppressed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings referred to in the following description, for convenience of description, among the constituent members of the embodiment of the present invention, only main members necessary for describing the present invention are shown. Accordingly, the present invention may include any components not shown in the following figures. Further, the dimensions of the members in the following drawings do not accurately represent the actual dimensions, the dimensional ratios of the members, and the like.

<First embodiment>
First Embodiment A wheel bearing device 1 according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a bearing device 1 for a wheel. The wheel bearing device 1 includes an inner ring member 100, an outer ring 20, a plurality of rolling elements 30, a retainer 40, and sealing members 50 and 60. The inner ring member 100, the outer ring 20, the retainer 40, and the sealing members 50 and 60 are annular members centered on the axis L1. As shown in FIG. 1, the wheel bearing device 1 has an attachment portion 111 formed outside in the axial direction, and is connected to the wheel. In FIG. 1, the left side of the paper is the outside direction of the vehicle (hereinafter referred to as an outer side), and the right side of the paper is the inside direction of the vehicle (hereinafter referred to as an inner side).

  The inner ring member 100 includes a hub wheel 110 and an inner ring 120. The hub wheel 110 and the inner ring 120 are annular members centered on the axis L1. The inner ring 120 is fixed to the axial inner side of the outer peripheral surface of the hub wheel 110. Two rows of raceway surfaces 31 and 32 are formed on the outer peripheral surface 101 of the inner ring member 100. Of these, the outer raceway surface 31 is formed on the outer peripheral surface of the hub wheel 110. The inner raceway surface 32 is formed on the outer peripheral surface of the inner race 120.

  As shown in FIG. 1, the hub wheel 110 has a flange portion 112 (the “large-diameter portion” of the present invention) that extends radially from the outer peripheral surface. The flange portion 112 is a flange-shaped member provided continuously over the entire circumference of the hub wheel 110. The collar 112 is an annular member centered on the axis L1. The flange portion 112 is provided on the outer side of the raceway surface 31 in the axial direction. The portion of the hub wheel 110 other than the collar 112 and the inner ring 120 correspond to the “small diameter portion” of the present invention.

  A part of the flange 112 serves as an attachment portion 111 for attaching the wheel bearing device 1 to a wheel. The mounting portion 111 is fixed to a wheel (not shown) using a bolt 113 or the like. The plurality of attachment portions 111 are provided, for example, at intervals in the circumferential direction.

  The outer race 20 is provided so as to cover a part of the outer peripheral surface of the inner race member 100. Specifically, the outer race 20 is provided so as to cover the inner side of the outer peripheral surface of the inner race member 100 from the flange 112 of the hub wheel 110. As shown in FIG. 1, two rows of raceway surfaces 33 and 34 are formed on the inner peripheral surface of the outer race 20. Each of the two rows of raceway surfaces 33 and 34 is positioned to face a raceway surface 31 formed on the hub wheel 110 and a raceway surface 32 formed on the inner ring 120, respectively. The raceway surfaces 33, 34 are annular regions centered on the axis L1.

  The plurality of rolling elements 30 are arranged in a space between the raceway surfaces 31 and 33 and in a space between the raceway surfaces 32 and 34. The plurality of rolling elements 30 are ball rolling elements. The plurality of rolling elements 30 are held by a holder 40. The rolling element 30 may be a roller rolling element or the like in addition to the ball rolling element.

  The retainer 40 has a plurality of pockets. The retainer 40 accommodates each of the plurality of rolling elements 30 in each of the plurality of pockets.

(Sealing member)
Next, the sealing member 50 will be described with reference to FIG. The sealing member 50 is provided in contact with the outer peripheral surface 101 of the hub wheel 110, the collar 112, and the outer end 22 of the outer ring 20. The sealing member 50 includes a slinger 510 and a sealing member 520. The sealing member 50 seals the space S1 between the inner race member 100 and the outer race 20 from outside.

(Slinger)
The slinger 510 includes a first part 511, a second part 512, a third part 513, and a fourth part 514. The first portion 511 extends in a direction perpendicular to the axis L1, and is formed in an annular shape around the axis L1. Further, the second part 512, the third part 513, and the fourth part 514 are formed in a cylindrical shape along the circumferential direction around the axis L1. The first part 511, the second part 512, the third part 513, and the fourth part 514 are integrally formed. The slinger 510 is formed of, for example, a metal such as stainless steel. The thickness d1 of the slinger 510 is, for example, 0.4 to 0.8 mm.

  The outer surface of the first portion 511 of the slinger 510 is formed in contact with the surface 1121 a of the collar portion 112 of the hub wheel 110. The radially inner end of the first portion 511 and the outer end of the second portion 512 are formed continuously. The radially outer end of the first part 511 and the outer end of the fourth part 514 are formed continuously.

  The second portion 512 of the slinger 510 is arranged such that a radially inner surface contacts the outer peripheral surface 101 of the hub wheel 110. The second part 512 is a fitting surface of the slinger 510 to the hub wheel 110. That is, the slinger 510 is fixed to the hub wheel 110 by the second portion 512 being fitted to the outer peripheral surface 101 of the hub wheel 110.

  The third part 513 of the slinger 510 is positioned radially outward of the second part 512. The inner end of the third portion 513 is formed continuously with the inner end of the second portion 512. The inner peripheral surface of the third portion 513 is in contact with the outer peripheral surface of the second portion 512.

  The second part 512 and the third part 513 of the slinger 510 are continuous via a curved surface K. That is, the second portion 512 and the third portion 513 are continuous in a section including the axis L1 with a smooth curve. It is not an essential configuration of the present invention that the second portion 512 and the third portion 513 are continuous via the curved surface K as in the present embodiment.

  The inner end of the fourth portion 514 of the slinger 510 is positioned to face the outer end surface 22 of the outer race 20. The gap formed between the inner end of the fourth portion 514 and the outer end face 22 of the outer race 20 is a small gap (labyrinth gap) LB1. Since the gap formed between the inner end of the fourth portion 514 and the outer end face 22 of the outer race 20 is the labyrinth gap LB1, the sealing member 50 surrounded by the slinger 510 from the outside is formed. It is possible to suppress the entry of moisture and the like into the internal space S2.

(Convex)
A convex portion 114 is formed on the outer side of the raceway surface 31 in the outer peripheral surface 101 of the hub wheel 110. The protrusion 114 has a ridge shape and extends in the circumferential direction. Further, the convex portion 114 is formed continuously annularly around the axis L1. The height h1 in the radial direction of the protrusion 114 is, for example, 0.05 to 0.5 mm. Note that, regarding the shape of the convex portion 114, it is not an essential configuration of the present invention that the convex portion 114 has a ridge shape as in this embodiment. Further, the fact that the convex portions 114 are formed continuously in an annular shape as in the present embodiment is not an essential configuration of the present invention.

  The convex portion 114 is positioned on the inner side of the second portion 512 of the slinger 510. By forming the convex portion 114 on the outer peripheral surface 101 of the hub wheel 110, it is possible to prevent the slinger 510 from moving in the axial direction and coming into contact with the rolling elements 30.

  In addition, as shown in FIG. 2, preferably, the thickness d1 of the second portion 512 of the slinger 510 is set to be larger than the radial height h1 of the convex portion 114.

(Seal member)
Seal member 520 includes a core metal 530 and a rubber member 540. The outer periphery of the cored bar 530 is covered with a rubber member 540.

  The core metal 530 is formed of, for example, a metal plate such as stainless steel. The core metal 530 includes a first part 531, a second part 532, and a third part 533.

  The first portion 531 of the cored bar 530 is formed in a cylindrical shape along the circumferential direction of the outer ring 20. The first portion 531 is in contact with the inner peripheral surface 23 of the outer ring 20. The first portion 531 is a fitting surface of the core metal 530 to the outer ring 20. That is, by fitting the first portion 531 with the inner peripheral surface 23 of the outer ring 20, the core metal 530 is fixed to the outer ring 20.

  The second portion 532 of the cored bar 530 extends in a direction perpendicular to the axis L1, and is formed in an annular shape around the axis L1. The second portion 532 is positioned at a position similar to the outer end surface 22 of the outer race 20 in the axial direction. The outer end of the first portion 531 and the radially outer end of the second portion 532 are formed continuously.

  The third portion 533 of the cored bar 530 is formed continuously with the radially inner end of the second portion 532. The third portion 533 extends from the end of the second portion 532 toward the inner side, and is formed in a cylindrical shape slightly inclined inward in the radial direction. The inner end of the third portion 533 is bent radially inward.

  The rubber member 540 is an annular member centered on the axis L1. The rubber member 540 covers the outer surface of the second part 532 of the cored bar 530 and the radially inner surface of the third part 533.

  The rubber member 540 includes a first axial lip 544, a second axial lip 545, and a radial lip 546. Each of the first axial lip 544, the second axial lip 545, and the radial lip 546 is formed annularly around the axis L1.

  The first axial lip 544 and the second axial lip 545 protrude from the outer surface of the rubber member 540 covering the second portion 532 of the metal core 530 toward the outer side. Each of the distal ends of the first axial lip 544 and the second axial lip 545 is bent radially outward, and is in contact with the inner surface of the first portion 511 of the slinger 510.

  The radial lip 546 protrudes radially inward from the inner end of the rubber member 540 that covers the third portion 533 of the cored bar 530. The tip of the radial lip 546 is bent toward the outer side, and is in contact with the radially outer surface of the third portion 513 of the slinger 510.

  Since the first axial lip 544, the second axial lip 545, and the radial lip 546 are provided as described above, moisture and the like enter from the space S2 into the space S1 inside the sealing member 50 inside the sealing member 50. Can be suppressed.

  As shown in FIG. 1, the sealing member 60 is an annular member provided between an inner end of the outer race 20 and an end of the inner race 120. The sealing member 60 includes a slinger 61 and a sealing member 62 as shown in FIG. 1 as an example.

(Fit the hub ring and slinger)
FIGS. 3 and 4 are views showing a state where the slinger 510 is fitted to the hub wheel 110. FIG. Hereinafter, a state where the slinger 510 is fitted to the hub wheel 110 will be described.

  The slinger 510 is fitted into the hub wheel 110 by moving the slinger 510 in the axial direction from the inner side to the outer side. At this time, as shown by an arrow A1 in FIG. 3, the operator applies a pressing force toward the outer side with respect to the connecting portion of the second part 512 and the third part 513 of the slinger 510, and pivots the slinger 510. Move in the direction. At this time, the slinger 510 is fitted with the inner peripheral surface of the second portion 512 of the slinger 510 in contact with the radially outer surface 1141 of the convex portion 114. At this time, the thickness d2 of the connecting part of the second part 512 and the third part 513 of the slinger 510 is the radial size of the part to which the press-in is applied.

  When the slinger 510 finishes moving to the outer side with respect to the convex portion 114, the worker moves the outer side of the connecting portion of the slinger 510 to the connection between the second part 512 and the third part 513 as shown by an arrow A2 in FIG. Is applied to move the slinger 510 in the axial direction. Then, when the first portion 511 of the slinger 510 contacts the surface 1121a of the collar portion 112 of the hub wheel 110, the movement of the slinger 510 to the outer side is stopped, and the fitting of the slinger 510 is completed.

  In the fitting operation of the slinger 510 in the state shown in FIG. 4, the operator presses a part of the connecting part of the slinger 510 between the second part 512 and the third part 513 which is not hidden by the convex part 114. Add. At this time, the difference d3 between the thickness d2 of the connecting part of the second part 512 and the third part 513 of the slinger 510 and the height h1 of the convex part 114 is the size in the radial direction of the part to which the press input is applied.

(Fit the hub wheel and outer ring)
As shown in FIG. 2, the seal member 520 is pressed into the outer ring 20 from the outer side such that the inner peripheral surface 23 of the outer ring 20 and the outer peripheral surface of the first portion 531 of the metal core 530 are in contact with each other. After the plurality of rolling elements 30 are arranged on the raceway surface 31 of the hub wheel 110, the outer ring 20 fitted with the seal member 520 is fitted into the hub wheel 110 from the inner side so as to cover the outer peripheral surface 101 of the hub wheel 110. . Thereby, the slinger 510 and the seal member 520 are arranged so as to face each other, and the sealing member 50 is configured.

(Effect of Embodiment 1)
According to the wheel bearing device 1 having the configuration of the first embodiment, the protrusion 114 between the inner end of the second portion 512 of the slinger 510 and the raceway surface 31 in the outer peripheral surface 101 of the hub wheel 110. Are formed, the movement of the slinger 510 toward the inner side in the axial direction is restricted, and the contact of the slinger 510 with the rolling elements 30 is suppressed.

  As described above, in the process of press-fitting the slinger 510, at least a part of the slinger 510 is present on the inner side of the protrusion 114 in the axial direction or at a position overlapping the protrusion 114 (that is, the slinger 510). 3 is in the position shown in FIG. 3), the operator applies a pressure input to the connecting portion of the second part 512 and the third part 513 of the slinger 510.

  At this time, the thickness d2 of the connecting part of the second part 512 and the third part 513 of the slinger 510 is the radial size of the part to which the press-in is applied. The connecting portion between the second portion 512 and the third portion 513 has a thickness d2 which is twice as thick as the thickness d1 forming the second portion 512 of the slinger 510 when viewed from the axial direction. At times, it is possible to push the slinger 510 stably.

  In the process of press-fitting the slinger 510, when the entire slinger 510 moves to the outer side from the convex portion 114 in the axial direction (that is, when the slinger 510 is at the position shown in FIG. 4), the worker moves in the axial direction. As a result, the slinger 510 is moved to the outer side while applying a pressure input to a portion of the connection between the second portion 512 and the third portion 513 that is not hidden by the projection 114. Therefore, the area of the portion to which the press-in can be applied is smaller than in the case of FIG.

  When the slinger does not have a configuration corresponding to the third part 513 in the present embodiment, as in the slinger of the bearing device having the conventional configuration, the slinger moves to the second part of the slinger after the slinger moves to the outer side of the protrusion. The portion corresponding to 512 is hidden by the convex portion, and it becomes difficult to push the slinger to the outer side.

  However, according to the present embodiment, the slinger 510 has the third portion 513 in addition to the second portion 512 in contact with the hub wheel 110. Therefore, the difference d3 between the thickness d2 of the connecting portion of the second portion 512 and the third portion 513 of the slinger 510 and the height h1 of the convex portion 114 is the radial size of the portion to which the press-in is applied. Therefore, even if the portion of the slinger 510 to which the press-fit is applied is hidden by the convex portion 114, a sufficient thickness d3 for the press-fitting work is secured.

  Therefore, according to the present embodiment, even when at least a part of the slinger 510 is present on the inner side of the protrusion 114 in the axial direction or at a position overlapping the protrusion 114 as shown in FIG. As shown in FIG. 4, even when the entire slinger 510 moves toward the outer side of the convex portion 114 in the axial direction, the slinger 510 can be easily pressed into the hub wheel 110.

  In the present embodiment, since the slinger 510 has the third portion 513 in addition to the second portion 512, the size of the press-fit portion of the slinger 510 is ensured without increasing the thickness of the second portion 512 of the slinger 510. be able to. Therefore, the thickness (the size in the axial direction) of the first portion 511 of the slinger 510, the thickness (the size in the radial direction) of the second portion 512, the thickness (the size in the radial direction) of the third portion 513, and The slinger 510 can be formed using a material in which the thickness (radial size) of the fourth portion 514 is uniform. Therefore, the slinger 510 can be easily press-fitted while suppressing an increase in the manufacturing cost of the slinger 510.

  Further, as another effect of the present embodiment, the second part 512 and the third part 513 of the slinger 510 are continuous via the curved surface K as shown in FIG. That is, the second portion 512 and the third portion 513 are continuous in a section including the axis L1 with a smooth curve. Therefore, when the outer race 20 is fitted into the hub wheel 110, the tip of the radial lip 546 of the rubber member 540 of the seal member 520 fixed to the outer race 20 is connected to the second part 512 and the third part 513 of the slinger 510. It is possible to prevent the continuous portion from being turned over and turned to the inner side.

<Embodiment 2>
Hereinafter, the wheel bearing device 1A according to the second embodiment will be described. FIG. 5 is an enlarged cross-sectional view showing the periphery of a sealing member 50A of the wheel bearing device 1A according to the second embodiment. The wheel bearing device 1A according to the second embodiment differs from the first embodiment in the configuration of the slinger 510A.

(Slinger)
Slinger 510A includes a first part 511, a second part 512A, a third part 513A, and a fourth part 514. The first portion 511 extends in a direction perpendicular to the axis L1, and is formed in an annular shape around the axis L1. The second portion 512A, the third portion 513A, and the fourth portion 514 are formed in a cylindrical shape along the circumferential direction with the axis L1 as a center. The first part 511, the second part 512A, the third part 513A, and the fourth part 514 are integrally formed. Slinger 510A is formed of a metal such as stainless steel, for example.

  The outer surface of the first portion 511 of the slinger 510A is formed in contact with the surface 1121a of the flange 112 of the hub wheel 110. The radially inner end of the first portion 511 and the outer end of the third portion 513A are formed continuously. The radially outer end of the first part 511 and the outer end of the fourth part 514 are formed continuously.

  The third portion 513A of the slinger 510A is formed to extend from the radially inner end of the first portion 511 to the inner side.

  The second portion 512A of the slinger 510A is formed to extend from the inner end of the third portion 513A to the outer side inside the third portion 513A in the radial direction. The inner peripheral surface of the third portion 513A is in contact with the outer peripheral surface of the second portion 512A.

  The second portion 512A of the slinger 510A is arranged such that a radially inner surface contacts the outer peripheral surface 101 of the hub wheel 110. The second portion 512A is a fitting surface of the slinger 510A with the hub wheel 110. That is, by fitting the second portion 512A with the outer peripheral surface 101 of the hub wheel 110, the slinger 510A is fixed to the hub wheel 110.

  The fourth portion 514 of the slinger 510A is positioned such that the inner end thereof faces the outer end surface 22 of the outer race 20 as in the first embodiment.

  Other configurations of the wheel bearing device 1A of the second embodiment are the same as those of the wheel bearing device 1 of the first embodiment.

(Effect of Embodiment 2)
According to the wheel bearing device 1A of the second embodiment, similarly to the first embodiment, the movement of the slinger 510A in the axial direction can be suppressed, and the slinger 510A can be easily pressed into the hub wheel 110.

(Modifications 1 and 2)
In the above embodiment, the case where the outer peripheral surface of the second portion 512 (512A) of the slinger 510 (510A) is in contact with the inner peripheral surface of the third portion 513 (513A) has been described. The contact between the outer peripheral surface and the inner peripheral surface of the third portion 513 is not an essential configuration for the present invention.

  FIG. 6 shows a modification of the first embodiment in which the outer peripheral surface of the second portion 512B of the slinger 510B is separated from the inner peripheral surface of the third portion 513B (Modification 1). In this case, when the slinger 510B is fitted to the hub wheel 110, the portion to which the press-fit is applied is further increased, so that the work at the press-fit becomes easy.

  However, from the viewpoint of the strength of the slinger, as in the first embodiment, it is preferable that the outer peripheral surface of the second portion 512 of the slinger 510 and the inner peripheral surface of the third portion 513 are in contact with each other.

  Similarly, FIG. 7 shows a modification of the second embodiment in which the outer peripheral surface of the second portion 512C of the slinger 510C and the inner peripheral surface of the third portion 513C are separated (Modification 2). In this case, when the slinger 510C is fitted to the hub wheel 110, the portion to which the press-fitting is applied is further increased, so that the work at the time of the press-fitting is facilitated.

(Modification 3)
In the above embodiment, the case where the shape of the convex portion 114 formed on the outer peripheral surface 101 of the hub wheel 110 is a ridge is described, but the shape of the convex portion 114 is not limited to the above embodiment. For example, as shown in Modification Example 3 in FIG. 8, the convex portion 114D may be formed to have a structure slightly larger in diameter than the outer peripheral surface 101 via a step 1142D.

  8, the axial movement of the slinger 510 is also restricted by the step 1142D. Therefore, it is possible to prevent the slinger 510 from moving in the axial direction and coming into contact with the rolling elements 30.

  The above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 1 Wheel bearing device 100 Inner ring member 110 Hub ring 114 Convex part 20 Outer ring 30 Rolling element 50 Sealing member 510 Slinger 511 First part 512 Second part 513 Third part 520 Sealing member 546 Radial lip

Claims (4)

An inner ring member including an annular small-diameter portion and an annular large-diameter portion having a radius larger than the small-diameter portion, and a first raceway surface formed on an outer peripheral surface of the small-diameter portion;
A second raceway surface facing the first raceway surface is formed on an inner peripheral surface, and an outer ring provided to cover the small diameter portion of the inner race member;
A plurality of rolling elements arranged in a space between the first raceway surface and the second raceway surface;
A step surface formed in a connection portion between the small diameter portion and the large diameter portion of the inner ring member, and a step surface extending in a direction perpendicular to an axial direction, and provided in contact with an outer peripheral surface of the small diameter portion, the inner ring member and the An annular sealing member that seals the space between the outer ring,
With
The sealing member,
A slinger fitted to the small diameter portion of the inner ring member,
A seal member fitted to the outer ring,
Including
The slinger,
An annular first portion extending in a direction perpendicular to the axial direction while contacting the step surface;
A cylindrical second portion in contact with the outer peripheral surface of the small diameter portion;
A cylindrical third part positioned radially outward of the second part;
Including
Either the second part or the third part is continuous with a radially inner end of the first part and has a shape extending in a direction away from the large diameter part in an axial direction,
An end on the opposite side to the large diameter portion in the axial direction of the second portion and an end on the opposite side to the large diameter portion in the axial direction of the third portion are continuous,
The small diameter portion of the inner ring member,
A projection formed on an outer peripheral surface between an end of the slinger opposite to the large-diameter portion in the axial direction of the second portion and the first track surface;
Only including,
The difference between the distance between the outer peripheral surface of the small diameter portion and the outer peripheral surface of the third portion in the radial direction and the radial height of the convex portion is larger than the radial size of the second portion of the slinger. Bearing device. The bearing device according to claim 1,
A bearing device, wherein an outer peripheral surface of the second part of the slinger and an inner peripheral surface of the third part are in contact with each other. In the bearing device according to claim 1 or 2,
A bearing device, wherein a radially inner end of the first portion of the slinger is continuous with an axially larger end of the second portion in the axial direction. The bearing device according to any one of claims 1 to 3 ,
The seal member,
A radial lip that projects radially inward and contacts the outer peripheral surface of the third part so that the tip faces the large diameter side in the axial direction;
The bearing device, wherein the second part and the third part of the slinger are continuous via a curved surface.

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