JP2009127790A - Bearing sealing device and bearing for wheel using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing sealing device having enhanced resistance to muddy water and having a reduced cross-sectional height, and a bearing for a wheel using the same. <P>SOLUTION: The bearing sealing device 1 is provided between relatively rotating inner and outer members of a bearing for a wheel and formed of an annular seal plate 2 and an elastic seal member 3. The seal plate 2 is formed in an L-shaped cross-section made up of a cylindrical part 2a fitted to the outer periphery of the inner member and of a vertical plate part 2b rising from the end of the cylindrical part 2a. The elastic seal member 3 is formed by securing an elastic body 5 to a core bar 4. The core bar 4 is formed in a reverse L-shaped cross-section made up of a cylindrical part 4a fitted in the inner periphery of the outer member and of a vertical plate part 4b hanging down from the end of the cylindrical part 4a and opposed to the seal plate 2. The elastic body 5 has two side-lips 5a, 5b arranged next to each other in the radial direction of the core bar 4 and having tips coming into contact with the vertical plate part 2b of the seal plate 2. The distance between the side lips 5a, 5b is not less than 0.1 mm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing sealing device that seals between an annular space between inner and outer rings of a bearing and an external environment, and a wheel bearing using the bearing sealing device.

As a bearing sealing device of this type, for example, as shown in FIG. 9, the diameter of the sealing plate 62 having an L-shaped cross section attached to the bearing inner ring and the upright plate portion 62 b rising on the outer diameter side of the sealing plate 62. It has two side lips 63a, 63b that are slidably in contact with each other in the direction, and is composed of an elastic seal 63 with a cored bar that is attached to the bearing outer ring, and has been proposed to improve muddy water resistance. (For example, patent document 1).
Further, as shown in FIG. 10, even in the wheel bearing 70 having a small diameter of the ball 64 as a rolling element, the bearing sealing device 61 having the two side lips 63a and 63b similar to the case of FIG. There has been proposed one in which the end of the bearing space between 71 and the bearing inner ring 72 is sealed to improve the muddy water resistance (for example, Patent Document 2).
JP 2007-9938 A JP 2001-165179 A

  However, in the bearing sealing device having the structure having the two side lips 63a and 63b as described above, the width dimension is about 4.5 to 5.0 mm, but the cross-sectional height of 8.5 to 10 mm is necessary. There is a problem that the cross-sectional height becomes higher than that of a bearing sealing device having a general structure with only one side lip. In recent years, in the field of automobiles, there has been an increasing demand for lower fuel consumption. Therefore, when such a bearing sealing device is provided in an automobile wheel bearing, the weight of the wheel bearing is reduced by reducing the axial and radial directions. A structure that can be realized is required. In order to meet this demand, a bearing sealing device that can improve the muddy water resistance and has a reduced cross-sectional height is desired.

  In addition, in the conventional example of the bearing sealing device having two side lips, no consideration is given to the relationship between the distance between the two lips and the muddy water resistance, and the side lip is kept to a height of 8 mm or more. In some cases, the distance was 0.1 mm or less. For this reason, with such a dimensional condition, although it has a structure having two side lips, it does not lead to an improvement in muddy water resistance.

  As described above, if the cross-sectional height of the bearing sealing device can be reduced, it is basically advantageous in reducing the weight and size of the wheel bearing provided with the bearing sealing device. However, for example, as shown in FIG. 11, depending on the bearing specifications, the bearing sealing device 81 is provided on the inboard side of the double-row outward angular ball bearing type wheel bearing 90 classified as the third generation. If the cross-sectional height is lowered, a weight increasing portion 91a may occur in a part of the bearing assembly part (for example, the outer member 91). That is, the outer diameter D of the portion located on the outer periphery of the bearing sealing device 81 of the outer member 91 is a portion to be fitted to a mating member such as a knuckle and is determined by the mating member. Therefore, if the cross-sectional height of the bearing sealing device 81 is lowered, the inner diameter of the portion of the outer member 91 where the bearing sealing device 81 is fitted becomes smaller, resulting in an increase in thickness, and this increased thickness portion becomes the weight increasing portion 91a. It becomes. For this reason, when reducing the section of the bearing sealing device, considerations that do not hinder the lightweight and compact wheel bearings are required.

An object of the present invention is to provide a bearing sealing device that can improve the muddy water resistance and reduce the cross-sectional height.
Another object of the present invention is to provide a wheel bearing capable of improving the muddy water resistance and reducing the cross-sectional height of the bearing sealing device and reducing the weight of the bearing.

A bearing sealing device according to the present invention is a bearing sealing device that seals between an outer member and an inner member that rotate relative to each other via rolling elements of a wheel bearing. A cross-section comprising an annular seal plate and an elastic seal member that are respectively attached and opposed to each other, the seal plate comprising a cylindrical portion that fits to the outer periphery of the inner member and a standing plate portion that rises from the end of the cylindrical portion It is made of an L-shaped metal, and the elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar, and the cored bar is fitted to the inner peripheral surface of the outer member. And having an upright plate portion falling from the end portion of the cylindrical portion, and having an inverted L-shaped cross section facing the seal plate, the elastic bodies are aligned with each other in the radial direction of the core metal, and the tips thereof are respectively Two plates in contact with the vertical plate of the seal plate It has a drip, and the distance between these two side lips and more 0.1 mm.
Thus, when the distance between the two side lips of the elastic seal member is 0.1 mm or more, the muddy water resistance is not lowered and the cross-sectional height can be lowered. For example, even when the cross-sectional height is lowered to 6 mm, the same muddy water resistance as that of a conventional bearing sealing device having two side lips and a high cross-sectional height can be secured.

In this invention, the sealing device sectional height, which is the radial length from the inner diameter surface of the seal plate to the outer diameter surface of the elastic seal member, is 6 to 8 mm, and the distance between the two side lips is 0. .1 to 2.0 mm may be used.
As mentioned in the explanation of the conventional example, lowering the cross-sectional height is advantageous for reducing the weight and size of the wheel bearing, but depending on the bearing specifications, the weight of the bearing assembly can be reduced by reducing the cross-section. May increase. Therefore, the cross-sectional height of the sealing device is set to 8 mm or less, enabling a certain amount of light weight and compactness, and the cross-sectional height to be set to 6 mm or more to avoid the weight of bearing assembly parts in wheel bearings for general passenger cars. is doing. The sealing device cross-section height corresponds to the range of 6-8mm, the distance between the two side lips is 0.1mm or more to ensure the muddy water resistance, and the sealing device cross-section height is high to 2.0mm or less. To avoid becoming. As a result, the wheel bearing can be reduced in height to a cross-section that can be made lighter and more compact, and the muddy water resistance can be improved.

  In the present invention, the ratio H / B of the sealing device cross-sectional height H to the sealing device width B, which is an axial dimension combining the seal plate and the elastic seal member, may be 1.2 to 1.8. When the ratio H / B is less than 1.2, it is difficult to make the sealing device cross-sectional height H a required height, for example, 6 mm or more, and the ratio H / B is 1.8. If it exceeds 1, the sealing device width B is narrow and it is difficult to ensure the muddy water resistance. When H / B is in the range of 1.2 to 1.8, a required height can be secured as the cross-sectional height H of the sealing device, and the width of the sealing device width B can be set to a necessary width. Both low profile and improved muddy water resistance can be achieved.

  In this invention, the elastic body may have a radial lip for preventing grease leakage extending toward the cylindrical portion of the seal plate. When this radial lip is provided, the grease in the wheel bearing can be prevented from leaking outside from the bearing sealing device.

  The radial lip may constitute a labyrinth seal close to the outer peripheral surface of the cylindrical portion of the seal plate. With the labyrinth seal, grease leakage can be prevented and non-contact is prevented, so that an increase in torque due to the sliding contact of the lip is prevented.

  In this invention, the inner peripheral surface of the elastic body may have a flat cross-sectional shape. That is, the radial lip on the inner diameter side may be eliminated. In this configuration, the effect of preventing grease leakage by the radial lip is lost, but there is a gap between the elastic seal member and the outer peripheral surface of the cylindrical portion of the seal plate. By adjusting this gap, the bearing sealing device Thus, the labyrinth seal effect can be obtained.

A wheel bearing according to the present invention is a wheel bearing that includes an outer member and an inner member that rotate relative to each other via a double row of rolling elements, and supports the wheel rotatably with respect to the vehicle body. In any one or both of the inboard side end and the outboard side end in the bearing space between the outer member and the inner member, the bearing sealing device according to any one of the inventions is provided.
According to this configuration, it is possible to reduce the weight by making the wheel bearing axial and radial directions compact, and durability is also improved by improving the muddy water resistance.

  In the present invention, the outer member may be a rotating member, and the bearing sealing device having any one of the above-described configurations of the present invention may be provided at an inboard side end in the bearing space. That is, in the second generation type outer ring rotation type wheel bearing, the bearing sealing device of the present invention may be provided at the inboard side end.

  In the present invention, the inner member includes a hub wheel having a hub flange for mounting a wheel and a shaft portion, and an inner ring fitted to an outer periphery of an inboard side end of the shaft portion of the hub wheel. And it is good also as what has the rolling surface of each row | line | column where the said rolling element rolls in the said inner ring | wheel. That is, the present invention may be applied to a third generation type wheel bearing.

  In the present invention, the inner member includes a hub wheel having a hub flange and a shaft portion for wheel attachment, and an outer joint member of a constant velocity universal joint, and a stem portion of the outer joint member is coupled to the hub wheel. In addition, the hub wheel and the outer joint member may have rolling surfaces of each row on which the rolling elements roll. That is, you may apply to the 4th generation type wheel bearing apparatus.

A bearing sealing device according to the present invention is a bearing sealing device that seals between an outer member and an inner member that rotate relative to each other via rolling elements of a wheel bearing. A cross-section comprising an annular seal plate and an elastic seal member that are respectively attached and opposed to each other, the seal plate comprising a cylindrical portion that fits to the outer periphery of the inner member and a standing plate portion that rises from the end of the cylindrical portion It is made of an L-shaped metal, and the elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar, and the cored bar is fitted to the inner peripheral surface of the outer member. And having an upright plate portion falling from the end portion of the cylindrical portion, and having an inverted L-shaped cross section facing the seal plate, the elastic bodies are aligned with each other in the radial direction of the core metal, and the tips thereof are respectively Two plates in contact with the vertical plate of the seal plate Has a drip, because of the distance between the two side lips or more 0.1 mm, it is possible to improve the muddy water performance and can be reduced section height.
A wheel bearing according to the present invention is a wheel bearing that includes an outer member and an inner member that rotate relative to each other via a double row of rolling elements, and supports the wheel rotatably with respect to the vehicle body. Since the bearing sealing device of the present invention is provided at one or both of the inboard side end and the outboard side end in the bearing space between the outer member and the inner member, the axial direction and the radial direction of the wheel bearing are provided. The weight can be reduced by downsizing, and the durability is improved by improving the muddy water resistance.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, the bearing sealing device 1 according to this embodiment is provided in a wheel bearing 20 and has both ends of an annular space formed between an outer member 21 and an inner member 22 that rotate relative to each other. It is to be sealed. The wheel bearing 20 supports the wheel rotatably with respect to the vehicle body. In this embodiment, the wheel bearing 20 is a double-row outward angular ball bearing type classified as a first generation type. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle with the wheel bearing 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 20 includes an outer member 21 having double-row rolling surfaces 24 on the inner periphery, an inner member 22 having rolling surfaces 25 respectively facing the rolling surfaces 24, and the double-rows. And a double row rolling element 23 interposed between the rolling surfaces 24 and 25. The inner member 22 is a split inner ring in which two bearing inner rings 22A are arranged in the axial direction. The rolling elements 23 are formed of balls, and are held by a holder 26 for each row. Here, the outer member 21 is a fixed member, and the inner member 22 is a rotating member.

As shown in FIG. 1, the bearing sealing device 1 includes an annular seal plate 2 and an elastic seal member 3 that are respectively attached to the inner member 22 and the outer member 21 and face each other.
The seal plate 2 is made of metal having an L-shaped cross section including a cylindrical portion 2a fitted to the outer peripheral surface of the inner member 22 and a standing plate portion 2b rising from an end portion of the cylindrical portion 2a. It is considered as a pressed product. A multipolar magnet 6 formed by vulcanizing and bonding a rubber magnet is provided on the outward surface of the standing plate portion 2 b of the seal plate 2. The multipolar magnet 6 is an annular member having a plurality of magnetic poles arranged in the circumferential direction. Thereby, the seal plate 2 is used both as a slinger and a magnetic encoder. That is, a rotation detection device that detects the rotation of the inner member 22 that is a rotation side member is configured by the seal plate 2 and a magnetic sensor (not shown) that is arranged facing the outward surface of the multipolar magnet 6. The In addition to the multipolar magnet 6 and the rubber magnet, a plastic magnet, a sintered magnet, a processed product of a magnet material, or the like may be used.
The elastic seal member 3 is obtained by fixing an elastic body 5 to an annular cored bar 4. The core metal 4 has a cylindrical portion 4a fitted to the inner peripheral surface of the outer member 21, and a standing plate portion 4b that falls from an end portion of the cylindrical portion 4a. The cross section is an inverted L-shape. The cored bar 4 is, for example, a sheet metal pressed product. The elastic body 5 is provided so as to cover the inner side of the cored bar 4, and has two side lips 5a and 5b and one radial lip 5c. The two side lips 5a and 5b are arranged side by side in the radial direction of the cored bar 4 and extend substantially parallel to each other from the standing plate part 4b of the cored bar 4 to the diagonally outer diameter side, and the respective tips thereof are respectively It contacts the upright plate portion 2b of the seal plate 2. The radial lip 5c is for preventing grease leakage, and extends from the tip of the upright plate portion 4b of the cored bar 4 toward the inner diameter side to the opposite side of the upright plate portion 2b of the seal plate 2, and the tip is a cylindrical portion of the seal plate 2 Touch 2a.

  The distance d between the two side lips 5a, 5b of the elastic seal member 3 is 0.1 mm or more in a state where the tips of the two side lips 5a, 5b are in contact with the standing plate portion 2b of the seal plate 2. Has been. In this embodiment, the distance d is a value in the range of 0.1 to 2.0 mm. The range of the distance d is ensured even in the worst state of variation in the press-fitting position during assembly of the bearing (deviation of the axial position of the seal plate 2 and the elastic seal member 3: Δg). The distance d is a distance in a direction orthogonal to the direction in which the two side lips 5a and 5b extend substantially in parallel, and a distance between the tips of the side lips 5a and 5b. The sealing device cross-sectional height H, which is the radial length from the inner diameter surface of the seal plate 2 to the outer diameter surface of the elastic seal member 3, is 6 to 8 mm. Further, the ratio H / B of the sealing device cross-sectional height H to the sealing device width B, which is an axial dimension combining the seal plate 2 and the elastic seal member 3, is 1.2 to 1.8.

  As described above, in the bearing sealing device 1 having the above-described configuration, the distance d between the two side lips 5a and 5b of the elastic seal member 3 is set to 0.1 mm or more. Can be lowered. For example, even when the cross-sectional height H is reduced to 6 mm, the same muddy water resistance as that of a conventional bearing sealing device having two side lips and a high cross-sectional height can be secured.

  As described in the description of the conventional example, if the cross-section height H is lowered, it is advantageous for reducing the weight and compactness of the wheel bearing. However, depending on the bearing specifications, the bearing assembly can be reversed by reducing the cross-section. The weight may increase. Therefore, in this embodiment, the cross-sectional height H is set to 6 to 8 mm to enable a certain amount of light weight and compactness, and the distance between the two side lips 5a and 5b corresponding to the cross-sectional height H. d is set to a value in the range of 0.1 to 2.0 mm. As a result, the wheel bearing can be reduced to a cross-sectional height H that can be reduced in weight and size, and the muddy water resistance can be improved.

  In this embodiment, since the ratio H / B of the sealing device cross-sectional height H to the sealing device width B is set to 1.2 to 1.8, both the reduction in the cross-section and the improvement of the muddy water resistance are compatible. .

  Moreover, in the wheel bearing 20 of FIG. 2 provided with the bearing sealing device 1 having the above-described configuration, it is possible to reduce the weight by making the axial and radial directions compact, and the durability is also improved by improving the muddy water resistance.

  FIG. 3 shows another embodiment of the bearing sealing device 1. In this embodiment, in the embodiment of FIG. 1, the radial lip 5 c of the elastic seal member 3 is configured in the vicinity of the outer peripheral surface of the cylindrical portion 2 a of the seal plate 2 to constitute the labyrinth seal 7. Other configurations are the same as those in the embodiment of FIG.

  As described above, even when the labyrinth seal 7 is configured by bringing the radial lip 5c close to the outer peripheral surface of the cylindrical portion 2a of the seal plate 2, grease leakage can be prevented. In this case, an increase in torque due to the sliding contact of the radial lip 5c is prevented.

  FIG. 4 shows still another embodiment of the bearing sealing device 1. In this embodiment, in the embodiment of FIG. 1, the inner peripheral surface of the elastic body 5 in the elastic seal member 3 has a flat cross-sectional shape, and the radial lip 5c in the case of FIG. 1 is omitted.

  When configured in this way, the effect of preventing grease leakage by the radial lip 5c is lost, but there is a clearance between the inner peripheral surface of the elastic body 5 and the outer peripheral surface of the cylindrical portion 2a of the seal plate 2 in the elastic seal member 3. Therefore, by adjusting the gap, it is possible to easily reduce the cross-section height H and to obtain the effect of the labyrinth seal.

  FIG. 5 shows another configuration example of the wheel bearing provided with the bearing sealing device 1 of the embodiment of FIG. This wheel bearing 30 is a double-row outward angular ball bearing type classified as a second generation type, and is an outer ring rotating type and a driven wheel supporting type. The wheel bearing 30 includes a hub wheel outer member 31 having double-row rolling surfaces 34 on the inner periphery, and an inner member 32 having rolling surfaces 35 respectively facing the rolling surfaces 34. A double row rolling element 33 interposed between the double row rolling surfaces 34 and 35 is provided. The outer member 31 has a hub flange 31a for wheel attachment on the outer periphery. A wheel (both not shown) is attached to the hub flange 31a with a hub bolt 37 via a brake rotor. The inner member 32 includes a split inner ring in which two bearing inner rings 32A and 32A each having a rolling surface 35 are arranged in the axial direction. An axle (not shown) is fixed to the inner diameter surface of the inner member 32. The rolling element 33 is formed of a ball and is held by a holder 36 for each row. Both ends of the annular space formed between the inner and outer members 32 and 31 are sealed with a pair of bearing sealing devices 1 and 11. As the bearing sealing device 1 on the inboard side, the bearing sealing device of the embodiment of FIG. 1 is used.

  FIG. 6 shows still another configuration example of the wheel bearing provided with the bearing sealing device 1 of the embodiment of FIG. This wheel bearing 40 is a double-row outward angular contact ball bearing type classified as a third generation type, and is an inner ring rotating type and for driving wheel support. The wheel bearing 40 includes an outer member 41 having double-row rolling surfaces 44 on the inner periphery, an inner member 42 having rolling surfaces 45 respectively facing the rolling surfaces 44, and the double-row rolling members 44. And a double row rolling element 43 interposed between the rolling surfaces 44 and 45. The outer member 41 is a member on the fixed side, and has a flange 41a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part. The inner member 42 is a member on the rotation side, and is fitted to the outer periphery of the hub wheel 47 having a hub flange 47a for wheel attachment on the outer periphery and the inboard side end of the shaft portion 47b of the hub wheel 47. And the inner ring 48. The rolling surfaces 45 of the respective rows are formed on the hub wheel 47 and the inner ring 48. The rolling element 43 is formed of a ball and is held by a holder 46 for each row. Both ends of the annular space formed between the inner and outer members 42 and 41 are sealed with a pair of bearing sealing devices 1 and 12. As the bearing sealing device 1 on the inboard side, the bearing sealing device of the embodiment of FIG. 1 is used.

  In assembling the wheel bearing 40 to the vehicle, the stem portion 16a of the outer joint member 16 of the constant velocity universal joint 15 is inserted into the through hole 17 of the hub wheel 47, and the outer peripheral surface of the stem portion 16a and the through hole are inserted. The outer joint member 16 is coupled to the inner member 42 by spline-fitting the inner peripheral surface of the nut 17 and tightening the nut 18 screwed onto the tip of the stem portion 16a. At this time, the cross section 16b on the outboard side provided in the outer joint member 16 is pressed against the end surface 48a facing the inboard side of the inner ring 48, and the inner member 42 is width-tightened by the outer joint member 16 and the nut 18. The The wheel mounting hub flange 47a is located at the end of the hub wheel 47 on the outboard side, and a wheel (not shown) is attached to the hub flange 47a with a hub bolt 37 via a brake rotor.

  FIG. 7 shows still another configuration example of the wheel bearing provided with the bearing sealing device 1 of the embodiment of FIG. The wheel bearing 50 is a double-row outward angular ball bearing type classified as a fourth generation type, and is an inner ring rotating type and supporting a driving wheel. The wheel bearing 50 includes an outer member 51 having double-row rolling surfaces 54 on the inner periphery, an inner member 52 having rolling surfaces 55 respectively facing the rolling surfaces 54, and the double-row rolling members 54. And a double row rolling element 53 interposed between the rolling surfaces 54 and 55. The rolling element 53 is formed of a ball and is held by a holder 56 for each row. Both ends of the annular space formed between the inner and outer members 52 and 51 are sealed with a pair of bearing sealing devices 1 and 13. As the bearing sealing device 1 on the inboard side, the bearing sealing device of the embodiment of FIG. 1 is used.

  The outer member 51 is a member on the fixed side, and has a flange 51a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part. The inner member 52 is a member on the rotation side, and a hub wheel 57 having a hub flange 57a for wheel attachment on the outer periphery of the shaft portion 57b, and a stem portion 58a is inserted into a central hole 58 of the hub wheel 57. And the outer joint member 58 of the constant velocity universal joint 70 to be fitted. The hub wheel 57 and the outer joint member 58 are formed with the rolling surfaces 55 of the respective rows. A wheel (both not shown) is attached to the hub flange 57a of the hub wheel 57 with a hub bolt 37 via a brake rotor. The constant velocity universal joint 70 includes a plurality of axial grooves 75 provided on the spherical inner surface of the cup-shaped portion 58b of the outer joint member 58, and a plurality of axial grooves 72 provided on the spherical outer surface of the inner joint member 71. Between them, a torque transmission ball 73 is interposed, and a cage 74 for holding the torque transmission ball 73 is provided.

  FIG. 8 shows still another configuration example of the wheel bearing provided with the bearing sealing device 1 of the embodiment of FIG. The wheel bearing 60 is a double row tapered roller bearing type classified as a first generation type. That is, this wheel bearing 60 is obtained by replacing the rolling elements 23 in the wheel bearing 20 shown in FIG. 2 with tapered rollers, and both ends of an annular space formed between the inner and outer members 22 and 21 are a pair of bearings. It is sealed with sealing devices 1 and 14. As the bearing sealing device 1 on the inboard side, the bearing sealing device of the embodiment of FIG. 1 is used. The inner member 22 is also composed of a split inner ring in which two bearing inner rings 22A are arranged in the axial direction, as in the embodiment of FIG.

It is sectional drawing of the bearing sealing device concerning one Embodiment of this invention. It is sectional drawing of an example of the wheel bearing which provided the same bearing sealing device. It is sectional drawing of the bearing sealing device concerning other embodiment of this invention. It is sectional drawing of the bearing sealing device concerning other embodiment of this invention. It is sectional drawing of the other example of the wheel bearing which provided the bearing sealing device of FIG. It is sectional drawing of the further another example of the wheel bearing which provided the bearing sealing device of FIG. It is sectional drawing of the further another example of the wheel bearing which provided the bearing sealing device of FIG. It is sectional drawing of the further another example of the wheel bearing which provided the bearing sealing device of FIG. It is sectional drawing of the conventional bearing sealing device. It is sectional drawing of the wheel bearing provided with the conventional bearing sealing device. It is sectional drawing of the other example of the wheel bearing which provided the conventional bearing sealing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bearing sealing apparatus 2 ... Seal plate 2a ... Cylindrical part 2b ... Standing plate part 3 ... Elastic seal member 4 ... Core metal 4a ... Cylindrical part 4b ... Standing plate part 5 ... Elastic body 5a, 5b ... Side lip 5c ... Radial lip 7 ... Labyrinth seals 20-60 ... Wheel bearings 21, 31, 41, 51 ... Outer members 22, 32, 42, 52 ... Inner members 23, 33, 43, 53 ... Rolling elements 31a, 47a, 57a ... Hubs Flange 45, 55 ... rolling surface 47, 57 ... hub wheel 47b, 57b ... shaft part 58 of hub wheel ... outer joint member 58a of constant velocity universal joint ... shaft part of outer joint member

Claims (10)

A bearing sealing device for sealing a space between an outer member and an inner member that rotate relative to each other via rolling elements of a wheel bearing,
An annular seal plate and an elastic seal member, which are respectively attached to the inner member and the outer member and face each other,
The seal plate is made of a metal having an L-shaped cross section composed of a cylindrical portion fitted to the outer periphery of the inner member and a standing plate portion rising from an end portion of the cylindrical portion,
The elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar,
The cored bar has a cylindrical portion fitted to the inner peripheral surface of the outer member and a standing plate portion that falls from an end portion of the cylindrical portion, and has an inverted L-shaped cross section facing the seal plate,
The elastic body has two side lips that are aligned with each other in the radial direction of the cored bar and whose tips are in contact with the standing plate portion of the seal plate,
A bearing sealing device in which the distance between these two side lips is 0.1 mm or more.   2. The distance between the two side lips according to claim 1, wherein a sealing device sectional height, which is a radial length from an inner diameter surface of the seal plate to an outer diameter surface of the elastic seal member, is 6 to 8 mm. A bearing sealing device with 0.1 to 2.0 mm.   3. The ratio of the sealing device cross-sectional height H to the sealing device width B, which is an axial dimension combining the seal plate and the elastic seal member, according to claim 1 or 2, wherein H / B is 1.2 to 1. 8 is a bearing sealing device.   4. The bearing sealing device according to claim 1, wherein the elastic body has a radial lip for preventing grease leakage that extends toward a cylindrical portion of the seal plate. 5.   The bearing sealing device according to claim 4, wherein the radial lip constitutes a labyrinth seal adjacent to an outer peripheral surface of a cylindrical portion of the seal plate.   4. The bearing sealing device according to claim 1, wherein an inner peripheral surface of the elastic body has a flat cross-sectional shape.   A wheel bearing having an outer member and an inner member that rotate relative to each other via a plurality of rolling elements, and rotatably supporting a wheel with respect to a vehicle body, wherein the outer member and the inner member The wheel bearing which provided the bearing sealing device of any one of Claims 1 thru | or 6 in any one or both of the inboard side end and the outboard side end in the bearing space between.   The wheel outer surface according to claim 7, wherein the outer member is a rotating member, and the bearing sealing device according to any one of claims 1 to 6 is provided at an inboard side end in the bearing space. bearing.   8. The hub according to claim 7, wherein the inner member includes a hub wheel having a hub flange for mounting a wheel and a shaft portion, and an inner ring fitted to an outer periphery of an inboard side end of the shaft portion of the hub wheel. The wheel bearing which has a rolling surface of each row | line where the said rolling element rolls to a ring | wheel and the said inner ring | wheel.   8. The inner member according to claim 7, wherein the inner member includes a hub wheel having a hub flange and a shaft portion for wheel mounting, and an outer joint member of a constant velocity universal joint, and a stem portion of the outer joint member is formed on the hub wheel. A wheel bearing having a rolling surface in each row on which the rolling elements roll to the hub wheel and the outer joint member.

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