JP2018141471A - Seal member and bearing device for wheel having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member which can be smoothly assembled by preventing the magnetic adhesion between the seal members, prevents a surface of a magnetic encoder from being scratched due to the intrusion of fine foreign matters into a clearance between the seal members, and can achieve weight reduction and cost reduction of the seal member, and a bearing device for a wheel having the same.SOLUTION: In an inner-side seal member 6 of a bearing device 1 for a wheel in which a seal plate 7 and a slinger 8 are arranged while making a support part 7b and an erecting plate part 8b oppose each other, and a plurality of seal lips 7c, 7d and 7e in contact with one side face of the erecting plate part 8b or an external peripheral face of a slinger cylinder part are arranged at one side face of the support part 7b, an encoder 8c is arranged at the other side face of the erecting plate part 8b while abutting on the other side face of the erecting plate part 8b at its one side face, and a flocking fiber body 7g which is formed by flocking a large number of fiber materials is annularly arranged at the other side face of the support part 7b as a flexible structure.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a seal member and a wheel bearing device including the seal member.

  2. Description of the Related Art Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device such as an automobile is known. The wheel bearing device is rotatably supported by a knuckle provided on a vehicle chassis or the like via a rolling element. Some wheel bearing devices include a magnetic encoder that detects the rotational speed of a wheel used for control of an antilock brake system or the like. The magnetic encoder is provided integrally with the inner seal member in order to reduce the size of the wheel bearing device. The seal member is a pack in which a seal plate fitted to the outer ring (outer member) of the wheel bearing device and a slinger fitted to the inner ring (inner member) so as to cover the seal plate are combined. It is configured as a seal. The seal member prevents leakage of internal grease by a seal lip provided on the seal plate coming into contact with the slinger, and also prevents foreign substances such as rainwater and dust from entering from the outside. The magnetic encoder is provided on the side surface of the slinger on the vehicle side (inner side).

  The seal member of such a wheel bearing device is manufactured separately in the same manner as each component constituting the wheel bearing device. The seal member constitutes a wheel bearing device by fitting a seal plate to the outer ring and fitting a slinger to the inner ring. In the assembly process of the wheel bearing device, when the seal member is stacked on a work table or the like, the seal members are sequentially stacked with the seal plate facing down in a set of pack seals in which the seal plate and the slinger are combined. In this case, smooth assembly may be hindered by the magnetic seal provided on the slinger being in contact with the core metal or the like of the seal member stacked on the upper side and magnetizing the lower seal member. There is. In some cases, an annular protrusion is formed on the lower surface of the seal plate so that there is no magnetic adhesion between the seal members. For example, as described in Patent Document 1.

  In the sealing member described in Patent Document 1, a sealing plate is overlaid on a slinger of a lower sealing member via an annular protrusion. That is, the seal member is laminated in a state where a gap corresponding to the protrusion amount of the annular protrusion is formed between the seal plate and the magnetic encoder of the lower seal member. Thus, the seal member is not magnetically attached to the magnetic encoder of the lower seal member.

JP 2001-141069 A

  In the technique described in Patent Document 1, an upper seal member is laminated on a magnetic encoder of a lower seal member via an annular protrusion. In this case, there is a possibility that a minute foreign matter or the like enters between the annular protrusion and the magnetic encoder, and the surface of the magnetic encoder is damaged. Further, since the weight of the rubber material necessary for forming the annular protrusion is increased, the weight of the sealing member is increased and the cost is increased.

  The present invention has been made in view of the circumstances as described above, and can smoothly assemble by preventing magnetic adhesion between the seal members, and magnetic particles can be formed by minute foreign matters entering between the seal members. An object of the present invention is to provide a seal member and a wheel bearing device including the seal member, which can prevent the surface of the encoder from being scratched and can reduce the weight and cost of the seal member.

  The first invention includes an outer member having an outer rolling surface formed on the inner periphery and at least one inner ring, and an inner member having an inner rolling surface facing the outer rolling surface formed on the outer periphery. Of the outer member and the inner member of a bearing device comprising a member and a rolling element that is slidably accommodated between the rolling surfaces of the outer member and the inner member. A seal member for sealing between the seal plate cylindrical portion fitted to the inner peripheral surface of the outer member, an annular support portion extending radially inward from the seal plate cylindrical portion, and one side surface of the support portion A sealing plate having a sealing lip provided on the inner surface, a slinger cylindrical portion fitted to the outer peripheral surface of the inner member, and an annular upright plate portion extending radially outward from the slinger cylindrical portion and facing the support portion And the other side surface of the standing plate portion, the one side surface of the standing plate portion A magnetic encoder provided in contact with the other side surface, wherein the seal lip contacts one side surface of the standing plate portion or the outer peripheral surface of the slinger cylindrical portion, and the other side surface of the support portion, and / or A flexible structure is provided on the other side of the magnetic encoder.

  According to a second aspect of the present invention, in the sealing member according to the first aspect, the flexible structure is provided in an annular shape on the other side surface of the support portion, and is a fold connecting the seal plate cylindrical portion and the support portion. It is extended in the outer peripheral part of a music part.

  According to a third invention, in the seal member according to the first invention, the flexible structure is provided in an annular shape on the other side surface of the magnetic encoder, and the outer peripheral end portion of the standing plate portion of the slinger and the It is extended in a gap portion with the seal plate cylindrical portion.

  A fourth invention is a wheel bearing device in which a seal member according to any one of the first to third inventions is incorporated.

  As effects of the present invention, the following effects can be obtained.

  That is, according to the first invention, when the seal members are stacked, the flexible structure is interposed between the seal plate and the slinger between the upper seal member and the lower seal member. Further, it is possible to smoothly assemble the bearing device by preventing magnetic adhesion between the seal members. In addition, even if foreign matter or the like enters between the flexible structure and the seal member, the surface of the seal member such as a magnetic encoder may be damaged because the foreign matter can be absorbed into the flexible structure. Can be prevented. Furthermore, since the rubber material necessary for forming the flexible structure is unnecessary, the weight of the sealing member can be reduced and the cost can be reduced.

  Moreover, according to 2nd invention, the sealing performance in the outer peripheral part of the bending part which connects a sealing plate cylindrical part and a support part can be improved.

  Further, according to the third aspect of the invention, it is possible to improve the sealing performance in the gap portion between the outer peripheral end portion of the slinger standing plate portion and the seal plate cylindrical portion.

  According to the fourth invention, when the seal members are stacked, the flexible structure is interposed between the seal plate and the slinger between the upper seal member and the lower seal member. Further, the magnetic bearing between the seal members can be prevented, and the wheel bearing device can be smoothly assembled. In addition, even if foreign matter or the like enters between the flexible structure and the seal member, the surface of the seal member such as a magnetic encoder may be damaged because the foreign matter can be absorbed into the flexible structure. Can be prevented. Furthermore, since the rubber material necessary for forming the flexible structure is unnecessary, the weight of the sealing member can be reduced and the cost can be reduced.

The perspective view which shows the whole structure in one Embodiment of the wheel bearing apparatus which concerns on this invention. The fragmentary sectional view which shows the whole structure in one Embodiment of the wheel bearing apparatus which concerns on this invention. The expanded end elevation which shows the structure of the seal member in one Embodiment of the wheel bearing apparatus which concerns on this invention. The perspective view which shows the structure of the sealing member in one Embodiment of the wheel bearing apparatus which concerns on this invention. (A) Sectional drawing which shows the state by which the sealing member was stacked in 1st embodiment of the sealing member which concerns on this invention, (b) The partial expanded sectional view in the state by which the sealing member was similarly stacked. The expanded end elevation which shows the structure of the seal member in 2nd embodiment of the wheel bearing apparatus which concerns on this invention. The expanded end elevation which shows the structure of the seal member in 3rd embodiment of the wheel bearing apparatus which concerns on this invention. The expanded end elevation which shows the structure of the sealing member in 4th embodiment of the wheel bearing apparatus which concerns on this invention.

  Below, the wheel bearing apparatus 1 which is 1st embodiment of the wheel bearing apparatus which concerns on this invention using FIGS. 1-4 is demonstrated.

  As shown in FIGS. 1 and 2, the wheel bearing device 1 supports a wheel rotatably in a suspension device of a vehicle such as an automobile. The wheel bearing device 1 includes an outer ring 2 that is an outer member, a hub ring 3 that is an inner member, an inner ring 4, two rows of inner side balls 5a (see FIG. 2) that are rolling rows, and an outer side ball row. 5b (refer FIG. 2), the inner side seal member 6 which is a seal member, and the outer side seal member 9 (refer FIG. 2) which is a seal member are comprised. In this specification, the “inner side” represents the vehicle body side of the wheel bearing device 1 when attached to the vehicle body, and the “outer side” represents the wheel bearing device 1 attached to the vehicle body. Represents the wheel side. The “radially outer side” represents a direction away from the rotation axis of the inner member, and the “radially inner side” represents a direction approaching the rotation axis of the inner member.

  As shown in FIG. 2, the outer ring 2 that is an outer member supports the hub ring 3 and the inner ring 4. The outer ring 2 is formed in a substantially cylindrical shape and is made of, for example, medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. In the outer ring 2, an inner side opening 2 a into which the inner side seal member 6 can be fitted is formed at the inner side end of the outer ring 2 arranged on the vehicle body side when the vehicle is mounted. In the outer ring 2, an outer side opening 2 b into which the outer side seal member 9 can be fitted is formed at an outer side end disposed on the wheel side when the vehicle is mounted.

  On the inner peripheral surface of the outer ring 2, an annular outer side rolling surface 2 c and an outer side outer rolling surface 2 d are formed in parallel to each other in the circumferential direction. The outer rolling surface 2d on the outer side is formed so that the inner side outer rolling surface 2c and the pitch circle diameter are equal or larger. A hardened layer having a surface hardness in the range of 58 to 64 HRC is formed, for example, by induction hardening on the inner side outer raceway 2c and the outer side outer raceway 2d. On the outer peripheral surface of the outer ring 2, a vehicle body attachment flange 2 e for attaching to a knuckle of a suspension device (not shown) is integrally formed.

  The hub wheel 3 constituting the inner member rotatably supports a vehicle wheel (not shown). The hub ring 3 is formed in a bottomed cylindrical shape, and is made of, for example, medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. In the hub wheel 3, a small-diameter step portion 3a having a reduced diameter on the outer peripheral surface is formed at an inner side end portion disposed on the vehicle body side when the vehicle is mounted. In the hub wheel 3, a wheel mounting flange 3 b for mounting a wheel is integrally formed at an outer side end disposed on the wheel side when the vehicle is mounted. The wheel mounting flange 3b is provided with hub bolts 3d at equal circumferential positions. Further, the hub wheel 3 is arranged so that the inner side rolling surface 3 c on the outer side faces the outer side rolling surface 2 d on the outer side of the outer ring 2.

  For example, the hub wheel 3 is hardened by induction hardening from the inner-side small-diameter step portion 3a to the outer-side inner raceway surface 3c in a range of 58 to 64 HRC. Thereby, the hub wheel 3 has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 3b, and the durability of the hub wheel 3 is improved. The hub wheel 3 is provided with an inner ring 4 at a small diameter step portion 3a. In the present embodiment, the serration (or spline) for torque transmission is formed on the inner periphery of the hub wheel 3, but the serration (or spline) may not be formed on the inner periphery of the hub wheel 3. it can.

  The inner ring 4 is a rolling train that preloads the inner side ball row 5a disposed on the vehicle body side when mounted on the vehicle and the outer side ball row 5b disposed on the wheel side when mounted on the vehicle. The inner ring 4 is formed in a cylindrical shape. The inner ring 4 is made of, for example, high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core portion by quenching. On the outer peripheral surface of the inner ring 4, an annular inner rolling surface 4a is formed in the circumferential direction. The inner ring 4 is fixed to the inner side end of the hub ring 3 in a state where a predetermined preload is applied by press-fitting. That is, the inner raceway 4 a is formed by the inner race 4 on the inner side of the hub race 3. In the hub wheel 3, the inner rolling surface 4 a of the inner ring 4 at the end on the inner side faces the outer rolling surface 2 c on the inner side of the outer ring 2, and the inner rolling surface 3 c on the outer side is on the outer side of the outer ring 2. It arrange | positions so that 2d of rolling surfaces may be opposed.

  The inner side ball row 5a and the outer side ball row 5b, which are rolling rows, support the hub wheel 3 rotatably. In the inner side ball row 5a and the outer side ball row 5b, a plurality of balls, which are rolling elements, are held in an annular shape by a cage. The inner side ball row 5a and the outer side ball row 5b are made of, for example, a high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 62 to 67HRC to the core portion by quenching. The inner side ball row 5a is sandwiched between the inner raceway surface 4a of the inner ring 4 and the outer raceway surface 2c on the inner side of the outer ring 2 so as to be freely rollable. The outer side ball row 5b is sandwiched between the inner raceway surface 3c of the hub wheel 3 and the outer raceway surface 2d on the outer side of the outer ring 2 so as to roll freely. That is, the inner side ball row 5 a and the outer side ball row 5 b support the hub wheel 3 and the inner ring 4 so as to be rotatable with respect to the outer ring 2.

  In the wheel bearing device 1, a double-row angular ball bearing is constituted by an outer ring 2, a hub ring 3, an inner ring 4, an inner side ball row 5a, and an outer side ball row 5b. In the present embodiment, the wheel bearing device 1 is configured with a double-row angular contact ball bearing, but is not limited thereto, and may be configured with a double-row tapered roller bearing or the like.

  As shown in FIGS. 2 to 4, the inner side seal member 6 closes the gap between the inner side opening 2 a of the outer ring 2 and the hub ring 3. The inner side seal member 6 in this embodiment is composed of a pack seal with an encoder of a two-side lip type that contacts two seal lips. The inner side sealing member 6 includes a substantially cylindrical sealing plate 7 and a substantially cylindrical slinger 8.

  As shown in FIG. 3, the seal plate 7 is composed of a core metal and a seal lip. The core metal is, for example, a ferritic stainless steel sheet (JIS standard SUS430 series, etc.), an austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel sheet (JIS standard SPCC system, etc.) ). The core metal is formed in a substantially L shape in an axial cross-sectional view by bending an outer edge portion of an annular steel plate by press working. As a result, the cored bar includes a seal plate cylindrical portion 7a and an annular support portion 7b extending from the end portion toward the axis. A sealing material is vulcanized and bonded to the inner side end of the sealing plate cylindrical portion 7a. A radial lip 7c, a dust lip 7d and an axial lip 7e are integrally vulcanized and bonded to one side (inner side) surface of the support portion 7b. Radial lip 7c, dust lip 7d and axial lip 7e are, for example, NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), heat resistance, chemical resistance It is made of synthetic rubber such as ACM (polyacrylic rubber), FKM (fluorine rubber), or silicon rubber, which has excellent properties. The seal plate 7 is configured integrally with the outer ring 2 with the seal plate cylindrical portion 7 a fitted into the inner side opening 2 a of the outer ring 2.

  The slinger 8 is made of, for example, a steel plate equivalent to the seal plate 7. The slinger 8 is formed in a substantially L shape in an axial cross-sectional view by bending an outer edge portion and an inner edge portion of an annular steel plate by press working. Thus, the slinger 8 includes a slinger cylindrical portion 8a and an annular standing plate portion 8b extending radially outward from the end of the slinger cylindrical portion 8a. The slinger 8 has a slinger cylindrical portion 8 a fitted and fixed to the inner ring 4 on the inner side of the seal plate 7. At this time, the slinger 8 is disposed such that the standing plate portion 8 b faces the support portion 7 b of the seal plate 7. Thereby, the radial lip 7c contacts the outer peripheral surface of the slinger cylindrical portion 8a, and the dust lip 7d and the axial lip 7e contact one side (outer side) surface of the standing plate portion 8b. It should be noted that the number of lips formed on the seal lip and the location where the lip is formed (the position in contact with the slinger) are not limited to the above. On the other side (inner side) surface of the upright plate portion 8b, a magnetic encoder 8c is provided such that one side (outer side) surface thereof is in contact with the other side surface of the upright plate portion 8b.

  Thus, the inner side seal member 6 is disposed so that the seal plate 7 fitted to the inner side opening 2a of the outer ring 2 and the slinger 8 fitted to the inner ring 4 face each other, thereby constituting a pack seal. doing. The radial lip 7c of the seal plate 7 is in contact with the slinger cylindrical portion 8a of the slinger 8 through an oil film, thereby preventing the grease inside the wheel bearing device 1 from leaking to the outside. The dust lip 7d of the seal plate 7 is in contact with the outer side (inner side) of the slinger cylindrical portion 8a than the contact position of the radial lip 7c via an oil film, and the inside of the foreign material such as dust from the outside of the wheel bearing device 1. Prevents entry into. Further, the axial lip 7e of the seal plate 7 is in contact with the standing plate portion 8b of the slinger 8 via an oil film to prevent the muddy water and the like from entering the wheel bearing device 1 from the outside. The inner side seal member 6 is configured to be slidable with respect to the slinger 8 when the radial lip 7c, the dust lip 7d and the axial lip 7e of the seal plate 7 contact the slinger 8 via an oil film. Thereby, the inner side sealing member 6 prevents the leakage of the lubricating grease from the inner side opening 2a of the outer ring 2 and the entry of foreign matters such as rainwater and dust from the outside.

  As shown in FIG. 2, the outer side sealing member 9 closes the gap between the outer side opening 2 b of the outer ring 2 and the hub ring 3. The outer side seal member 9 is configured as an integral seal in which a seal lip is vulcanized and bonded to a substantially cylindrical cored bar.

  The core of the outer side seal member 9 is, for example, a ferritic stainless steel plate (JIS standard SUS430 series or the like), an austenitic stainless steel plate (JIS standard SUS304 series or the like), or a rust-proof cold rolled steel plate ( JIS standard SPCC system, etc.). The core metal is formed in a substantially L shape in an axial cross-sectional view by bending an outer edge portion of an annular steel plate by press working. For example, NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber excellent in heat resistance and chemical resistance) ), FKM (fluoro rubber), or synthetic rubber such as silicon rubber.

  The outer side seal member 9 has a core metal fitted into the outer side opening 2 b of the outer ring 2. At this time, the outer side seal member 9 is arranged so that the seal lip contacts the seal sliding surface of the hub wheel 3. The outer side seal member 9 is configured to be slidable with respect to the seal sliding surface when the seal lip contacts the seal sliding surface of the hub wheel 3 through the oil film. As a result, the seal lip of the outer side seal member 9 prevents leakage of lubricating grease from the outer side opening 2b of the outer ring 2 and entry of foreign matters such as rainwater and dust from the outside.

  In the wheel bearing device 1 configured as described above, the hub wheel 3 and the inner ring 4 are rotatably supported by the outer ring 2 via the inner side ball row 5a and the outer side ball row 5b. In the wheel bearing device 1, the gap between the inner side opening 2 a of the outer ring 2 and the inner ring 4 is closed by the inner side seal member 6, and the gap between the outer side opening 2 b of the outer ring 2 and the hub ring 3 is closed. The outer side sealing member 9 is closed. As a result, in the wheel bearing device 1, the hub wheel 3 and the inner ring 4 supported by the outer ring 2 rotate while preventing leakage of lubricating grease from the inside and entry of foreign matters such as rainwater and dust from the outside. .

  Next, a detailed description of the seal plate 7 and a state in which the inner side seal members 6 are stacked will be described in detail with reference to FIGS. 3 to 5.

  As shown in FIG. 3, the support portion 7b of the seal plate 7 is formed with a step portion bent from the outer side of the seal plate cylindrical portion 7a toward the inner side (slinger 8 side). As a result, an outer protruding plate portion 7f is formed at the radially outer end portion of the support portion 7b of the seal plate 7 so as to protrude to the outer side in an annular plate shape from other portions of the support portion 7b. Further, as shown in FIG. 3 and FIG. 4, on the other side (outer side) surface of the outer protruding plate portion 7f, a flocked fiber body 7g formed by flocking a large number of fiber materials as a flexible structure is formed in an annular shape. Provided. The flocked fiber body 7g constitutes an outer axial end portion of the inner seal member 6.

  The fiber material used for the grafted fiber body 7g is a polyolefin resin such as polyethylene or polypropylene, a polyamide resin such as nylon, an aromatic polyamide resin, a polyethylene resin such as polyethylene terephthalate, polyethylene naphthalate, polyethylene succinate, or polybutylene terephthalate, It is composed of synthetic resin fibers such as acrylic resin, vinyl chloride and vinylon, inorganic fibers such as carbon fiber and glass fiber, regenerated fibers such as rayon and acetate, or natural fibers such as cotton, silk, hemp and wool. . However, the fiber material is preferably a synthetic resin fiber that is chemically stable and hardly swells or dissolves due to grease and can be produced in a large amount at a low cost. The shape of the fiber material is preferably 0.5 to 1.6 mm in length. Furthermore, it is preferable that the shape of the fiber material is not a straight fiber but a bend fiber (a fiber having a curved tip). This is because the fiber material is intricate and the gap is hardly formed and the density becomes constant. The fiber material is softer than the magnetic rubber forming the magnetic encoder 8c so as not to damage the surface of the magnetic encoder 8c.

  The fiber material in this embodiment is planted by electrostatic spraying. The electrostatic spraying process is a flocking method in which an adhesive is applied to an arbitrary region and a large number of fiber materials charged to the adhesive application surface are sprayed, and is completed through a drying process and a finishing process. According to the electrostatic spraying process, the fiber material is inclined with respect to the surface of the base material and fixed at a constant angle. In addition, the direction of the fiber material is irregular, and there is a feature that a gap is hardly generated and the density is constant. In addition, it is also possible to make it the structure which affixes the sheet-like thing which planted the fiber material beforehand on the other side (outer side) surface in the outer side protruding plate part 7f.

  Examples of the adhesive include an adhesive mainly composed of urethane resin, epoxy resin, acrylic resin, vinyl acetate resin, polyimide resin, silicone resin, and the like. Specifically, urethane resin solvent adhesive, epoxy resin solvent adhesive, vinyl acetate resin solvent adhesive, acrylic resin emulsion adhesive, acrylic ester-vinyl acetate copolymer emulsion adhesive, vinyl acetate Based emulsion adhesive, urethane resin based emulsion adhesive, epoxy resin based emulsion adhesive, polyester based emulsion adhesive, ethylene-vinyl acetate copolymer based adhesive, and the like.

  As shown in FIG. 5A, in the assembly process of the wheel bearing device 1, the seal plate 7 and the slinger 8 constituting the inner side seal member 6 are connected between the outer ring 2 and the inner ring 4 of the wheel bearing device 1. In the case of assembling, the seal plate 7 and the slinger 8 are stacked on a work table or the like as a set of pack seals. At this time, the inner side seal member 6 has a slinger 8 with the support plate 7b facing downward and a slinger 8 with the upright plate portion 8b facing upward disposed on the same axis.

  As shown in FIG. 5B, the radial position of the slinger 8 with respect to the seal plate 7 is such that the radial lip 7c vulcanized and bonded to the support portion 7b contacts the outer peripheral surface of the slinger cylindrical portion 8a. Determined. Further, the slinger 8 is positioned in the axial direction with respect to the seal plate 7 by the dust strip 7d and the axial lip 7e vulcanized and bonded to the support portion 7b coming into contact with the other side surface of the upright plate portion 8b. That is, the slinger 8 is supported by the radial lip 7c, the dust lip 7d, and the axial lip 7e.

  In one inner side seal member 6 (hereinafter referred to as “lower inner side seal member 6”), flocking of another inner side seal member 6 (hereinafter referred to as “upper inner side seal member 6”) The fibrous body 7g contacts the encoder side (inner side) end of the seal plate cylindrical portion 7a of the lower inner side seal member 6. In other words, a gap is formed between the support portion 7b of the upper inner seal member 6 and the magnetic encoder 8c of the lower inner seal member 6 by the height of the flocked fiber body 7g. Therefore, the influence of the magnetic force of the magnetic encoder 8c of the lower inner seal member 6 on the support portion 7b of the upper inner seal member 6 is reduced, and the upper inner seal member 6 becomes the lower inner seal. It is not magnetically attached to the member 6.

  With such a configuration, when the inner side seal member 6 of the wheel bearing device 1 is stacked in the assembly process, the flocked fiber is interposed between the support portion 7b of the upper inner side seal member 6 and the magnetic encoder 8c. By interposing the body 7g, the support portion 7b of the upper inner seal member 6 is configured not to contact the magnetic encoder 8c. Thereby, magnetic adhesion of the inner side seal members 6 stacked together is prevented, and the inner side seal member 6 can be easily separated, so that the wheel bearing device 1 can be smoothly assembled.

  Moreover, the inner side sealing member 6 in this embodiment is very small between the flocked fiber body 7g and the magnetic encoder 8c when the upper inner side sealing member 6 is stacked on the upper surface of the lower inner side sealing member 6. Even when a foreign substance enters, the foreign substance can be absorbed into the flocked fiber body 7g. For this reason, it is possible to prevent the surface of the inner side seal member 6 such as the magnetic encoder 8c from being damaged. Furthermore, in this embodiment, since the rubber raw material required in order to form the flocked fiber body 7g is unnecessary, the weight reduction of the inner side sealing member 6 and cost reduction are realizable.

  In addition, in this embodiment, although the flocked fiber body 7g is used as a flexible structure, it has the intensity | strength which can support the weight at the time of stacking the inner side sealing member 6, and can absorb a micro foreign material Other materials can be used as long as they have a gap. For example, as the flexible structure, a porous resin material having innumerable large and small holes may be used. In this case, synthetic resin such as polyurethane, polystyrene, polyolefin, phenol, polyvinyl chloride, synthetic rubber such as chloroprene rubber, ethylene propylene rubber, nitrile rubber, silicon rubber, styrene butadiene rubber, or natural rubber is used as the resin material. be able to. However, the resin material is preferably a synthetic resin or a synthetic rubber that is chemically stable and hardly swells or dissolves due to oil, and that can be produced in a large quantity at a low cost.

  In addition, in this embodiment, although the flocked fiber body 7g is comprised in the annular | circular shape as a flexible structure, if the weight at the time of stacking the inner side sealing member 6 can be supported, it will differ from the shape. You can also For example, the flexible structure can be formed into a discontinuous annular shape or formed into a plurality of dot shapes (in this case, if the flexible structure is formed at least at three locations, the stacked inner side sealing members 6 can be supported). Further, the flexible structure may be provided on the other side (inner side) surface of the magnetic encoder 8 c in addition to the support portion 7 b in the seal plate 7.

  Next, the inner side sealing member 16 which is 2nd embodiment of the sealing member which concerns on this invention is demonstrated using FIG. In addition, in description of the inner side sealing member which concerns on the following embodiment, the same thing is pointed out using the name, figure number, and code | symbol used by description of the inner side sealing member 6 shown in FIGS. 1-5. And That is, in the following embodiment, the detailed description of the same points as those of the above-described embodiment will be omitted, and different parts will be mainly described.

  As shown in FIG. 6, in the inner side sealing member 16 in the present embodiment, the support portion 7b of the seal plate 17 is bent from the outer side of the seal plate cylindrical portion 7a toward the inner side (slinger 8 side). A step is formed. As a result, an outer protruding plate portion 7f is formed at the radially outer end portion of the support portion 7b in the seal plate 17 so as to protrude to the outer side in an annular plate shape from the other portions of the support portion 7b.

  Further, on the other side (outer side) surface of the outer protruding plate portion 7f, a flocked fiber body 7h formed by flocking a large number of fiber materials as a flexible structure is provided in an annular shape, and the seal plate cylindrical portion 7a. And the outer peripheral portion of the bent portion connecting the support portion 7b.

  According to the inner side sealing member 16 according to the present embodiment, the grease is infiltrated and held in the flocked fiber body 7h provided at the outer peripheral portion of the bent portion connecting the seal plate cylindrical portion 7a and the support portion 7b. The fitting portion between the seal plate cylindrical portion 7a and the inner side opening 2a can be covered from the inside of the annular space by the grease held in the flocked fiber body 7h. That is, according to this embodiment, the sealing performance in the outer peripheral portion of the bent portion connecting the seal plate cylindrical portion 7a and the support portion 7b can be improved.

  Next, the inner side sealing member 26 which is 3rd embodiment of the sealing member which concerns on this invention is demonstrated using FIG. As shown in FIG. 7, in the inner side sealing member 26 in this embodiment, the flocking formed by flocking many fiber materials as a flexible structure on the other side (inner side) surface of the magnetic encoder 8c in the slinger 28. The fiber body 8d is provided in an annular shape.

  With this configuration, when the inner side seal member 26 is stacked in the assembly process, the flocked fiber body 8d is interposed between the support portion 7b of the upper inner side seal member 26 and the magnetic encoder 8c. Thus, the support portion 7b of the upper inner seal member 26 is configured not to contact the magnetic encoder 8c. Thereby, the magnetic adhesion of the stacked inner side seal members 6 can be prevented and the inner side seal member 26 can be easily separated, so that the wheel bearing device can be smoothly assembled.

  Moreover, the inner side sealing member 26 in this embodiment is provided between the flocked fibrous body 8d and the outer protruding plate portion 7f when the upper inner side sealing member 26 is stacked on the upper surface of the lower inner side sealing member 26. Even when a minute foreign matter or the like enters, the foreign matter can be absorbed into the flocked fiber body 7g. For this reason, it is possible to prevent the surface of the inner side sealing member 26 such as the outer protruding plate portion 7f from being damaged. Furthermore, in the present embodiment, since a rubber material necessary for forming the flocked fiber body 8d is unnecessary, it is possible to reduce the weight and cost of the inner side sealing member 26.

  Next, the inner side sealing member 36 which is 4th embodiment of the sealing member based on this invention is demonstrated using FIG. As shown in FIG. 8, in the inner side sealing member 36 in this embodiment, the flocking formed by flocking a large number of fiber materials as a flexible structure on the other side (inner side) surface of the magnetic encoder 8c in the slinger 38. The fiber body 8e is provided in an annular shape.

  Further, the inner side seal member 36 in the present embodiment is extended in a gap portion between the outer peripheral end portion of the standing plate portion 8 b of the slinger 38 and the seal plate cylindrical portion 7 a of the seal plate 7.

  According to the inner side sealing member 36 according to the present embodiment, the flocked fiber body 8e provided in the gap portion between the outer peripheral end portion of the standing plate portion 8b and the sealing plate cylindrical portion 7a leads to the inner side sealing member 36 from the outside. Intrusion of foreign substances such as rainwater and dust can be further prevented. That is, according to the present embodiment, it is possible to improve the sealing performance in the gap portion between the outer peripheral end portion of the standing plate portion 8b and the seal plate cylindrical portion 7a.

  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.

  That is, in the present embodiment, the inner side seal member 6 in the wheel bearing device 1 has been described as the seal member according to the present invention. However, the present invention includes a bearing device that is not for wheels (the transfer surface includes a single row). ) Is also applicable. Moreover, it is also possible to apply to the outer side in the wheel bearing device.

  Further, in the present embodiment, the wheel bearing device 1 is configured as a wheel bearing device 1 having a third generation structure in which the inner raceway surface 3c of the inner side ball row 5a is directly formed on the outer periphery of the hub wheel 3. However, the application target of the sealing member according to the present invention is not limited to this. For example, it may be a first generation structure mainly composed of an outer ring which is an outer member and a pair of inner rings which are inner members. Further, the second generation structure of the inner ring rotation specification is constituted by an outer ring which is an outer member having a mounting flange and a pair of inner rings which are inner members, and the pair of inner rings are fitted to the outer periphery of the hub ring. It may be. Moreover, the outer ring | wheel which is an outer member is formed as a hub ring | wheel, The 2nd generation structure of the outer ring | wheel rotation specification comprised by this hub ring and a pair of inner ring | wheels which are inner members may be sufficient. In addition, a support shaft having a mounting flange into which one inner ring is fitted as an inner member is provided, and an outer ring which is an outer member is formed as a hub ring, which is the hub ring and the inner member. It may be a third generation structure of an outer ring rotation specification composed of a fitting body of an inner ring and a support shaft. Furthermore, a hub wheel and a universal joint are connected as an inner member, and a fourth structure is formed by an outer ring that is an outer member having a mounting flange, a hub ring that is an inner member, and a fitting body of the universal joint. It may be a generation structure.

DESCRIPTION OF SYMBOLS 1 Wheel bearing apparatus 2 Outer ring 2a Inner side opening 3 Hub ring 4 Inner ring 5a Inner side ball row 5b Outer side ball row 6 Inner side seal member 7 Seal plate 7a Seal plate cylindrical portion 7b Support portion 7f Outer protruding plate portion 7g Flocking fiber Body (flexible structure)
7h Flocked fiber (flexible structure)
8 Slinger 8a Slinger cylindrical portion 8b Standing plate portion 8c Magnetic encoder 8d Flocked fiber body (flexible structure)
8e Flocked fiber (flexible structure)

Claims (4)

An outer member having an outer rolling surface formed on the inner periphery;
An inner member having at least one inner ring and having an inner rolling surface facing the outer rolling surface on the outer periphery;
A rolling element housed in a freely rolling manner between the rolling surfaces of the outer member and the inner member, and seals between the outer member and the inner member in a bearing device. A sealing member for
A seal plate having a seal plate cylindrical portion fitted to the inner peripheral surface of the outer member, an annular support portion extending radially inward from the seal plate cylindrical portion, and a seal lip provided on one side surface of the support portion A slinger having a slinger cylindrical portion fitted to the outer peripheral surface of the inner member, an annular vertical plate portion extending radially outward from the slinger cylindrical portion and facing the support portion, and the vertical plate portion A magnetic encoder provided on one side surface of the other side surface in contact with the other side surface of the upright plate portion,
The seal lip is in contact with one side surface of the standing plate portion or the outer peripheral surface of the slinger cylindrical portion,
A sealing member, wherein a flexible structure is provided on the other side of the support and / or the other side of the magnetic encoder.   The flexible structure is provided in an annular shape on the other side surface of the support portion, and is extended to an outer peripheral portion of a bent portion that connects the seal plate cylindrical portion and the support portion. The sealing member according to claim 1.   The flexible structure is provided in an annular shape on the other side surface of the magnetic encoder, and extends in a gap portion between the outer peripheral end of the standing plate portion of the slinger and the seal plate cylindrical portion. The sealing member according to claim 1, wherein:   A wheel bearing device in which the seal member according to any one of claims 1 to 3 is incorporated.

Images