JP2006010055A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of maintaining bearing performance in a satisfactory condition for a long time. <P>SOLUTION: A hub unit 100 is the bearing device provided with an outer ring member 11, a hub 13 being an inner ring member capable of rotating relatively for the outer ring member 11 through balls 17 being a plurality of rolling bodies, and a sealing device 19 like a circular ring fixed to the outer ring member 11 in an outer side part in the axial direction of the outer ring member 11 and sealing a clearance between the outer ring member 11 and the hub 13. The hub 13 has a collar-like flange part 13b widened on an outer side in the radial direction more than outside diameter of the outer side part of the outer ring member 11. The sealing device 19 has a contact type sealing member 23 being a first sealing part for coming into slide-contact with an outer peripheral face of the hub 13 and/or an inner side face of the flange part 13b continuous with the outer peripheral face and a non-contact type sealing member 25 being a second sealing part for sealing between the inner side face of the flange part 13b and it on an outer side in the radial direction more than outside diameter in the outer side part of the outer ring member 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing device suitable for rotatably supporting a wheel of a vehicle such as an automobile.

  As shown in FIG. 18, the hub unit 10 that is a bearing device for rotatably supporting the wheels of the automobile is held by the outer ring member 2 fixed to the chassis of the automobile and the cage 3 so as to be able to roll. And a hub (inner ring member) 1 arranged to be rotatable relative to the outer ring member 2 via a plurality of rolling elements (balls) 4. Since the hub unit 10 is disposed in a place where the muddy water or the like is easily applied, a sealing device 5 is provided between the hub 1 and the outer ring member 2.

  As a conventional sealing device 5, a seal member 6 having three seal lips 6 a is attached to the inner peripheral surface 2 a of the outer ring member 2, and each seal lip 6 a is slidably contacted with the hub 1 for sealing. Is known. In addition, there are some which have a labyrinth effect by reducing the gap C1 between the end surface 2b of the outer ring member 2 and the inner surface of the flange portion 1b of the hub 1.

  However, in the sealing device 5 configured as described above, the seal member 6 is mounted on the inner peripheral surface 2 a of the outer ring member 2, and the end surface 2 b of the outer ring member 2 and the inner side surface of the flange portion 1 b of the hub 1. It will be arrange | positioned in the vicinity of the labyrinth formed by. For this reason, foreign matters such as muddy water and dust that have passed through the labyrinth easily reach the seal member 6, and the seal lip 6a may be damaged.

  Moreover, the hub 1 and the outer ring member 2 are generally formed of carbon steel or the like, and rust is likely to be generated in a portion that is directly exposed to muddy water. And the rust which generate | occur | produced in the bearing outer side of the sealing device 5 progresses to the sliding contact part of the seal lip 6a, and the sealing performance of the seal member 6 is lowered, and further, the seal lip 6a is damaged, and muddy water is generated. There is a case where the bearing enters the inside of the bearing, and there is a problem that the bearing performance cannot be maintained in a good state for a long time.

  This invention is made | formed in view of the subject mentioned above, The objective is to provide the bearing apparatus which can maintain bearing performance favorably over a long period of time.

  In order to achieve the above-described object, the bearing device according to the present invention is characterized by the following (1) to (4).

(1) An outer ring member, an inner ring member that is rotatable relative to the outer ring member via a plurality of rolling elements, and an outer ring member fixed to the outer ring member at an axially outer side portion of the outer ring member An annular sealing device that seals a gap between the inner ring member and a bearing device,
The inner ring member has a flange-like flange portion that spreads radially outward from the outer diameter of the outer portion of the outer ring member;
The sealing device comprises:
A first seal portion that is slidably in contact with an outer peripheral surface of the inner ring member and / or an inner side surface of the flange portion that is continuous with the outer peripheral surface at a radially inner side than an outer diameter of the outer portion of the outer ring member; ,
A second seal portion that seals between the outer surface of the outer ring member and the inner side surface of the flange portion at a radially outer side than an outer diameter of the outer portion;
Have

  According to the bearing device having the above configuration, the sealing device that seals the gap between the outer ring member and the inner ring member includes the outer peripheral surface of the inner ring member and / or the outer periphery on the radially inner side of the outer diameter of the axially outer portion of the outer ring member. A second seal that seals between a first seal portion that slides in contact with an inner surface of the flange portion that is continuous with the surface and an inner surface of the flange portion on a radially outer side of the outer diameter of the outer portion of the outer ring member. Therefore, the gap between the outer ring member and the inner ring member can be sealed twice to improve the sealing performance. The first seal portion is in sliding contact with the outer peripheral surface of the inner ring member and / or the inner surface of the flange portion continuous with the outer peripheral surface on the radially inner side of the outer diameter of the outer portion of the outer ring member, 2 is sealed between the inner surface of the flange portion on the radially outer side of the outer diameter of the outer portion of the outer ring member, that is, the second seal portion is in sliding contact with the first seal portion. It can arrange | position in the position spaced apart from the location to the bearing outer side. Thereby, it is possible to make it difficult for foreign matters such as muddy water and dust that have passed through the second seal portion to reach the sliding contact portion of the first seal portion, and to suppress the progress of rust to the sliding contact portion. Can do. Therefore, it is possible to maintain good bearing performance over a long period of time.

(2) In the bearing device according to (1) above,
The second seal portion is spaced apart from the inner side surface of the flange portion with a slight gap in the axial direction at least when the relative rotation between the outer ring member and the inner ring member is stopped.

  According to the bearing device having the above configuration, at least when the relative rotation between the outer ring member and the inner ring member is stopped, the second seal portion and the inner surface of the flange portion are not in contact with each other, and the outer surface of the bearing is not in contact with the first seal portion. In the second seal portion that is exposed to a poor environment due to being arranged on the side and is likely to be insufficiently lubricated, when the rotation is stopped for a long time, the second seal portion is fixed to the inner surface of the flange portion. Therefore, the lifetime of the second seal portion can be extended.

(3) In the bearing device according to (1) or (2) above,
On the inner surface of the flange portion, a step portion that forms a step in the radial direction over the entire circumference is provided,
The second seal portion overlaps the stepped portion in the axial direction.

  According to the bearing device having the above-described configuration, the second seal portion overlaps the stepped portion that forms a step in the radial direction over the entire circumference on the inner surface of the flange portion, and thus overlaps the first seal portion. The direct impact of muddy water and dust can be avoided. As a result, it is possible to effectively prevent foreign matters such as muddy water and dust from entering the bearing device and maintain good bearing performance.

(4) In the bearing device according to any one of (1) to (3),
The first seal portion includes a cored bar, and an elastic seal lip that is fixed to the cored bar and is in sliding contact with the outer peripheral surface of the inner ring member and / or the inner side surface of the flange unit,
The second seal portion has at least a cored bar,
The core metal of the first seal part and the core metal of the second seal part are integrally formed.

  According to the bearing device having the above configuration, since the core metal of the first seal portion and the core metal of the second seal portion are integrally formed, the number of parts is reduced and the assembly man-hour is reduced. Assembling becomes easy and the bearing device can be manufactured at low cost.

  The core metal is preferably formed of a non-rusting plate material having a plate thickness of about 0.3 mm to 1.0 mm. As the non-rusting plate material, for example, a stainless steel plate, titanium, SPCC or the like iron plate made of a surface treatment such as plating to make it non-rusting, synthetic resin, etc. can be used, but a stainless steel plate is preferred. . For the stainless steel plate, a magnetic material such as SUS430 or SUS410 may be used. However, if a nonmagnetic material such as SUS304 is used, iron powder contained in external foreign matters is not adsorbed. The reason why the plate thickness is set to 0.3 mm to 1.0 mm is that if the plate thickness is 0.3 mm or less, the mechanical strength is insufficient, and there is a possibility that the plate is deformed when fixed to the end of the outer ring member. In addition, if the plate thickness is 1.0 mm or more, there is a problem that it is difficult to process. An elastic material such as rubber or resin can be suitably used as the elastic material forming the seal lip.

  According to the bearing device of the present invention, it is possible to provide a bearing device capable of maintaining good bearing performance over a long period of time.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a hub unit according to a first embodiment of the bearing device of the present invention, and FIG. 2 is an enlarged view of a main part in FIG.

  As shown in FIGS. 1 and 2, the hub unit 100 includes an outer ring member 11, a hub 13 that is an inner ring member, and an inner ring 15 that is formed separately from the hub 13 and is integrally fixed to the hub 13. And balls 17 that are a plurality of rolling elements, and a sealing device 19.

  The outer ring member 11 is attached to a frame (not shown) of the vehicle body via a knuckle (not shown). The hub 13 which is an inner ring member is a substantially cylindrical member, and has an axial end at a radially outer side than an outer diameter of an axial end (axial outer side) on the same side of the outer ring member 11. An expanded bowl-shaped flange portion 13b is formed. On the inner side surface of the flange portion 13b that is continuous with the outer peripheral surface of the hub 13, a step portion 13c that forms a step in the radial direction over the entire circumference is provided. A brake disc rotor (not shown), wheels (not shown), and the like are attached to the flange portion 13b.

  Two rows of outer ring raceway surfaces 11a, 11a parallel to each other are formed on the inner peripheral surface of the outer ring member 11 apart from each other, and inner ring raceway surfaces 13a, 15a are provided on the outer peripheral surfaces of the hub 13 and the inner ring 15, respectively. It is formed corresponding to each outer ring raceway surface 11 a of the outer ring member 11. A plurality of balls 17, which are rotatably held by a cage 21, are arranged at equal intervals in the circumferential direction on a track constituted by the inner ring raceway surfaces 13 a and 15 a and the outer ring raceway surfaces 11 a and 11 a. As a result, the hub 13 can rotate relative to the outer ring member 11 about the axis CL.

  The sealing device 19 includes a contact-type seal member 23 that is an annular first seal portion and a non-contact-type seal member 25 that is a second seal portion, and the non-contact-type seal member 25 is a contact-type seal member. 23 is spaced apart from the bearing outer side. The contact-type seal member 23 includes a core metal 27 formed in a substantially U-shaped annular shape from a non-rusting material such as a stainless steel plate, and an elastic member 29 formed of rubber or the like. It is configured to be fixed to the gold 27. The elastic member 29 is provided with three annular seal lips 29a, 29b, and 29c. The core metal 27 is press-fitted and fixed to the inner peripheral surface 11 c of the outer portion of the outer ring member 11, and the seal lips 29 a, 29 b, 29 c of the elastic member 29 are larger than the outer diameter of the outer portion of the outer ring member 11. Also, on the inner side in the radial direction, the outer ring surface of the shoulder part 13d of the inner ring raceway surface 13a or the inner side surface of the root part of the flange part 13b continuous with the outer peripheral surface of the shoulder part 13d is slidably contacted.

  The non-contact type sealing member 25 is an annular member formed in a substantially crank shape in cross section with a non-rusting material such as a stainless steel plate. The non-contact type seal member 25 includes a mounting portion 25a that is fitted on the outer peripheral surface 11d of the outer side portion of the outer ring member 11, and is integrally raised radially outward from the mounting portion 25a and further bent in the axial direction to be a hub. 13 extending portions 25b extending in the direction of the flange portion 13b. The inner diameter ID2 of the extension portion 25b is larger than the inner diameter ID1 of the mounting portion 25a and slightly larger than the outer diameter OD1 of the step portion 13c of the flange portion 13b.

  The outer peripheral surface 11d of the outer portion of the outer ring member 11 is processed to have an outer diameter that is substantially equal to the inner diameter ID1 of the attachment portion 25a of the non-contact type seal member 25. The non-contact type seal member 25 includes the attachment portion 25a. Is pressed into the outer peripheral surface 11 d of the outer ring member 11, and the extension 25 b is fixed in a state of protruding toward the flange 13 b of the hub 13. The extension portion 25b overlaps the step portion 13c in the axial direction with a slight gap C2 from the outer peripheral surface of the step portion 13c of the hub 13, and the extension portion 25b and the step portion 13c of the hub 13 constitute a labyrinth. Thus, the outer ring member 11 is sealed with the flange portion 13b on the outer side in the radial direction than the outer diameter of the outer side portion.

  The clearance C3 between the outer end surface 11b of the outer ring member 11 and the inner surface of the flange portion 13b of the hub 13 opposed to the end surface 11b is set to be approximately the same as the clearance C2 between the extension portion 25b and the step portion 13c. By doing so, the labyrinth length may be lengthened to further enhance the labyrinth effect. Further, the material of the non-contact type sealing member 25 is not limited to the stainless steel plate, and may be made non-rusting by performing a surface treatment such as plating on an iron plate such as titanium or SPCC. Also, a synthetic resin or the like may be used.

  According to the hub unit 100 described above, the sealing device 19 includes the contact-type seal member 23 and the non-contact-type seal member 25 as shown in FIGS. 1 and 2, and the gap between the outer ring member 11 and the hub 13. Are sealed twice without increasing the rotational torque to improve the sealing performance.

  In the non-contact type seal member 25, the mounting portion 25a is fixed to the outer peripheral surface 11d of the outer ring member 11, and the extended portion 25b is spaced from the outer peripheral surface of the step portion 13c of the flange portion 13b with a slight gap C2 to the step portion 13c. The labyrinth constituted by the extended portion 25b and the step portion 13c of the hub 13 is slid between the seal lips 29a, 29b, 29c of the contact-type seal member 23 and the hub 13. It is provided at a position away from the contact point on the outer side of the bearing. This makes it difficult for foreign matter such as muddy water and dust that has passed through the labyrinth to reach the sliding contact portion of the contact seal member 23, and even if rust is generated in the vicinity of the non-contact seal member 25, It is possible to suppress the rust from proceeding to the contact-type seal member 23, and it is possible to prevent a problem that the rust is caught in the seal lips 29a, 29b, and 29c and the sealing performance is deteriorated.

  Further, since the gap C3 between the end surface 11b of the outer ring member 11 and the inner surface of the flange portion 13b of the hub 13 facing the end surface 11b is covered by the extension portion 25b of the non-contact type seal member 25, external muddy water or Even when foreign matter such as dust is applied to the hub unit 100, the non-contact type seal member 25 prevents foreign matter from entering the hub unit 100. In addition, since foreign matter that has entered the interior through the non-contact type seal member 25 is sealed by the contact type seal member 23, the inside of the hub unit 100 is securely sealed and exposed to muddy water, dust, chemicals, or the like. Even when used in a poor environment, the bearing performance is maintained in a good state for a long period of time.

  Next, a modification of the hub unit 100 according to the first embodiment will be described with reference to FIG. FIG. 3 is an enlarged view of a main part showing a second seal portion of a hub unit which is a modified example of the first embodiment.

  In the hub 13 of the hub unit 110, the stepped portion 13c of the flange portion 13b is formed in a tapered shape that gradually increases in diameter toward the outer side in the radial direction. In addition, the non-contact type seal member 37 that is the second seal portion is formed in a simple cylindrical shape, and the mounting portion 37 a that is one end of the non-contact type seal member 37 is the outer peripheral surface of the outer ring member 11. 11d and it is fixed in the state which the extension part 37b which is the other edge part protrudes toward the step part 13c of the flange part 13b. The distal end of the extension portion 37b and the outer peripheral surface of the step portion 13c of the flange portion 13b constitute a labyrinth with a slight gap C2, and the flange is disposed on the radially outer side of the outer diameter of the outer portion of the outer ring member 11. Sealing is performed between the portion 13b.

  The other parts are the same as those of the hub unit 100 according to the first embodiment of the present invention. Therefore, the same parts are denoted by the same or corresponding reference numerals, and the description thereof is simplified or omitted.

  According to the hub unit 110 described above, since the non-contact type seal member 37 is formed in a simple cylindrical shape, it is easy to manufacture and can be provided at low cost. Other operations and effects are the same as those of the hub unit 100 of the first embodiment.

(Second Embodiment)
Next, 2nd Embodiment of the bearing apparatus of this invention is described with reference to FIG. 4 and FIG. FIG. 4 is a cross-sectional view of a main part of a hub unit as a second embodiment of the bearing device of the present invention, and FIG. 5 is an enlarged view of a portion surrounded by an ellipse V in FIG.

  As shown in FIGS. 4 and 5, the hub unit 200 of the second embodiment has many common points with the hub unit 100 of the first embodiment, and the form and flange portion of the second seal portion. Since only the details of the step portions provided in are different, the same portions are denoted by the same or corresponding reference numerals, and description thereof will be simplified or omitted.

  In the hub 13 which is an inner ring member of the hub unit 200, a seal groove 13e having an opening on the outer peripheral surface is provided over the entire circumference of the step portion 13c of the flange portion 13b.

  The non-contact type seal member 45, which is the second seal portion, includes a core metal 47 having a substantially cross-sectional shape and a lip portion 49 made of an elastic material such as rubber. The cored bar 47 is a member in which a non-rusting material such as a stainless steel plate is formed in an annular shape, and is integrally raised radially outward from the mounting part 47a and the mounting part 47a, and further bent in the axial direction. And an extended portion 47b extending toward the flange portion 13b.

  The lip portion 49 is formed in an annular shape by an elastic material such as rubber, and a base portion 49a fixed to the tip end portion of the extension portion 47b of the core metal 47 is formed on the outer peripheral edge portion, and as it goes toward the inner peripheral edge portion. A seal lip 49b, which is gradually thinner, is formed continuously with the base 49a. The base 49a is fixed to the tip of the extension 47b of the cored bar 47 with an adhesive or the like. The inner diameter ID3 of the front end portion of the seal lip 49b is smaller than the outer diameter OD1 of the step portion 13c of the flange portion 13b.

  The non-contact type seal member 45 has the attachment portion 47a in a state where the extension portion 47b protrudes toward the step portion 13c of the flange portion 13b and the tip end portion of the seal lip 49b is immersed in the seal groove 13e in a non-contact manner. Is fixed to the outer peripheral surface 11 d of the outer ring member 11. As a result, a labyrinth is formed by the seal lip 49b and the seal groove 13e, and sealing is performed between the outer ring member 11 and the flange portion 13b on the radially outer side of the outer diameter of the outer portion.

  According to the hub unit 200 of the present embodiment, the non-contact type seal member 45 is fitted to the outer peripheral surface 11d of the outer ring member 11, and the mounting portion 47a is extended from the mounting portion 47 and the step portion 13c of the flange portion 13b. A cored bar 47 having an extension part 47b that overlaps in the axial direction, and a lip part 49 having a seal lip 49b fixed to the tip of the extension part of the cored bar 47 and immersed in the seal groove 13e of the flange part 13b. Since the labyrinth is configured by the lip portion 49 and the seal groove 13e, a labyrinth gap having a complicated shape can be formed to enhance the labyrinth effect.

  Other operations and effects are the same as those of the hub unit 100 of the first embodiment.

  Next, a modification of the hub unit 200 of the second embodiment will be described with reference to FIG. FIG. 6 is an enlarged view of a main part of a hub unit which is a modification of the second embodiment.

  As shown in FIG. 6, a hub unit 210 which is a modification of the hub unit 200 of the second embodiment is configured such that the seal groove of the flange portion 13b in the hub unit 200 of the second embodiment has a metal ring 61 having a U-shaped cross section. Since it is the same as that of the hub unit 200 of 2nd Embodiment except having formed by (2), about the part which is common in 2nd Embodiment, the same code | symbol is attached | subjected and clarification is performed, or description is simplified or abbreviate | omitted.

  The metal ring 61 is formed from a non-rusting material such as a stainless steel plate in an annular shape having a U-shaped cross section, and is formed to have a seal groove 61 a that opens outward in the radial direction. The bottom surface 61 b is fitted and fixed to the outer peripheral surface of the step portion 13 c of the hub 13. The non-contact type seal member 45 that is the second seal portion is disposed in a state where the tip end portion of the seal lip 49b is immersed in the non-contact state in the seal groove 61a, and the labyrinth is provided by the seal lip 49b and the seal groove 61a. The outer ring member 11 is sealed with the flange portion 13b on the outer side in the radial direction from the outer diameter of the outer portion.

  According to the hub unit 210 described above, since the seal groove 61a is formed by the metal ring 61 made of a non-rusting material, the seal groove 61a can be provided without performing complicated machining on the hub 13. As a result, the hub unit 210 can be manufactured at low cost. Moreover, since all the members constituting the labyrinth (that is, the metal ring 61 and the seal lip 49b) are made of a non-rusting material, it is possible to prevent deterioration of the sealing performance due to rust and to be stable over a long period of time. Bearing performance can be maintained.

  Other operations and effects are the same as those of the hub unit 200 of the second embodiment.

(Third embodiment)
Next, a hub unit which is a third embodiment of the bearing device of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of an essential part of a hub unit which is a third embodiment of the bearing device of the present invention.

  As shown in FIG. 7, the hub unit 300 of the third embodiment has many common points with the hub unit 200 of the second embodiment, and is a non-contact type seal member that is a second seal portion. Since only the forms are different, the same parts are denoted by the same or corresponding reference numerals, and the description thereof will be simplified or omitted.

  In the hub unit 300, the flange portion 13b of the hub 13 has a first seal groove 13e formed in the step portion 13c, and a second seal groove 13f that is recessed in the axial direction radially outward from the step portion 13c. is doing. Further, the lip portion 55 fixed to the distal end portion of the extension portion 47b of the cored bar 47 of the non-contact type seal member 54 which is the second seal portion is a first portion formed radially inward from the base portion 55a. It has a seal lip 55b and a second seal lip 55c formed in the axial direction.

  The non-contact type seal member 54 is disposed in a state where the first seal lip 55b is inserted into the first seal groove 13e and the second seal lip 55c is inserted into the second seal groove 13f in a non-contact manner. Thereby, the first seal lip 55b and the first seal groove 13e, and the second seal lip 55c and the second seal groove 13f constitute a double labyrinth, and the radius is larger than the outer diameter of the outer portion of the outer ring member 11. On the outside in the direction, sealing is performed with the flange portion 13b.

  According to the hub unit 300 described above, the non-contact type seal member 54 is extended from the mounting portion 47 a that fits to the outer peripheral surface 11 d of the outer ring member 11 and the mounting portion 47 to the stepped portion 13 c of the hub 13 in the radial direction. A core metal 47 having an opposing extension 47b, a first seal lip 55b fixed to the tip of the extension of the metal core 47 and immersed in the first seal groove 13e of the hub 13, and a second seal groove 13f of the hub 13. A lip portion 55 having a second seal lip 55c immersing in the first lip, and a double labyrinth is formed by the first seal lip 55b and the first seal groove 13e, and the second seal lip 55c and the second seal groove 13f. As a result, a more complicated labyrinth gap is formed and the labyrinth effect is enhanced, so that entry of foreign matter can be efficiently prevented.

  Other operations and effects are the same as those of the hub unit 200 of the second embodiment.

(Fourth embodiment)
Next, a hub unit that is a fourth embodiment of the bearing device of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of a main part of a hub unit which is a fourth embodiment of the bearing device of the present invention.

  As shown in FIG. 8, the hub unit 400 of the fourth embodiment has many common points with the hub unit 210 which is a modified example of the second embodiment, and is a non-contact which is a second seal portion. Since only the form of the mold seal member is different, portions common to the modification of the second embodiment are denoted by the same reference numerals for clarification, and description thereof is simplified or omitted.

  In the hub unit 400, the metal ring 67 made of a non-rusting material is formed in an annular shape having a substantially C-shaped cross section, and an upper portion of the side wall on the outer ring member 11 side is opened to form a seal groove 67a. The metal ring 67 is fixed by bringing the other side wall 67c into contact with the inner surface of the flange portion 13b of the hub 13 and fitting the bottom portion 67b to the step portion 13c of the flange portion 13b.

  The non-contact type seal member 70 that is the second seal portion is configured such that a lip portion 71 made of an elastic material such as rubber is fixed to the distal end portion of the extension portion 47 b of the core metal 47. The lip portion 71 includes a base portion 71a fixed to the distal end portion of the extension portion 47b of the cored bar 47, a first seal lip 71b formed radially inward from the base portion 71a, and a radially outward direction from the base portion 71a. And a second seal lip 71c formed toward the head.

  The lip portion 71 is inserted from the opening of the metal ring 67, the first seal lip 71b is received in the seal groove 67a in a non-contact manner, and the second seal lip 71c has a slight gap with the opening end portion 67d of the metal ring 67. And are arranged so as to face each other in the axial direction. The non-contact type seal member 70 has a double labyrinth formed by the first seal lip 71 b and the seal groove 67 a, and the second seal lip 71 c and the opening end 67 d of the metal ring 67. It seals between the flange part 13b on the outer side in the radial direction than the outer diameter.

  According to the hub unit 400 described above, a double labyrinth can be formed at the same time by the simple-shaped metal ring 67 and the lip portion 71, whereby the hub unit 400 can be manufactured at low cost.

  Other operations and effects are the same as the operations and effects of the hub unit 210 which is a modified example of the second embodiment.

(Fifth embodiment)
Next, a hub unit which is a fifth embodiment of the bearing device of the present invention will be described with reference to FIG. FIG. 9 is a sectional view of an essential part of a hub unit which is a fifth embodiment of the bearing device of the present invention.

  As shown in FIG. 9, the hub unit 500 of the fifth embodiment has many common points with the hub unit 200 of the second embodiment shown in FIG. Since only the shape of the contact-type seal member is different, parts common to the second embodiment are denoted by the same reference numerals for clarification, and description thereof is simplified or omitted.

  In the hub unit 500 of the fifth embodiment, the non-contact type seal member 73 as the second seal portion includes a cored bar 75 made of a non-rusting material such as a stainless steel plate and a lip portion 49 made of an elastic material such as rubber. And a sealing member 77. The metal core 75 is a member formed in an annular shape having a substantially crank shape in cross section, and is integrally raised from the mounting portion 75a to the outer peripheral surface 11d of the outer ring member 11 and radially outward from the mounting portion 75a. And an extension portion 75b that is bent in the axial direction and extends toward the flange portion 13b.

  The end of the mounting portion 75a of the cored bar 75 is widened radially outward to have a large diameter, and the end is sealed with an elastic material such as rubber to have a substantially U-shaped cross section. A member 77 is fixed by an adhesive or the like. The inner diameter of the sealing member 77 is the same as the inner diameter of the mounting portion 75a, and is pressed into the outer peripheral surface 11d of the outer ring member 11 and fixed together with the mounting 75a.

  According to the hub unit 500 described above, a slight gap formed between the core metal 75 of the non-contact type seal member 73 and the outer peripheral surface 11d of the outer ring member 11 is reliably sealed by the sealing member 77 having elasticity. . Therefore, it is possible to prevent a slight amount of muddy water entering from between the metal core 75 and the outer peripheral surface 11d of the outer ring member 11, and an excellent sealing performance can be obtained.

  Other operations and effects are the same as those of the hub unit 200 of the second embodiment.

  As in the hub unit 510 shown in FIG. 10, in the non-contact type seal member 73, an annular shape formed of an elastic material such as rubber on the inner peripheral surface of the attachment portion 75 a of the core metal 75 over the entire circumference. The sealing member 81 may be fixed with an adhesive or the like, and the sealing member 81 may be fitted on the outer peripheral surface 11 d of the outer ring member 11. As a result, the space between the outer peripheral surface 11 d of the outer ring member 11 and the annular member 75 can be more reliably sealed by the sealing member 81.

(Sixth embodiment)
Next, a hub unit according to a sixth embodiment of the bearing device of the present invention will be described with reference to FIGS. 11 is a sectional view of a hub unit according to a sixth embodiment of the bearing device of the present invention, FIG. 12 is an enlarged view of a portion surrounded by an ellipse XII of the hub unit in FIG. 11, and FIG. 13 is a view of the hub unit in FIG. The assembly procedure is shown, (a) is a sectional view of the hub unit before assembly, and (b) is a sectional view of the hub unit after assembly. In addition, about the part which is common in each embodiment mentioned above, the same code | symbol is attached | subjected and it aims at clarification and description is simplified or abbreviate | omitted.

  As shown in FIGS. 11 and 12, the hub unit 600 includes a non-contact type seal member 87 that is a second seal portion to which a lip portion 95 made of an elastic material such as rubber is fixed, and an elastic material such as rubber. And a metal ring 89 to which a lip portion 91 made of a material is fixed.

  The non-contact sealing member 87 includes a cored bar 93 made of a non-rusting material such as a stainless steel plate, and a lip portion 95 made of an elastic material such as rubber. The metal core 93 has a side wall 93b erected radially outward from an attachment portion 93a that is fitted on the outer peripheral surface 11d of the outer ring member 11, and is further bent from the side wall 93b toward the flange portion 13b of the hub 13 to extend the extension portion 93c. Is formed to have a substantially U-shaped cross section. The mounting portion 93a, the side wall 93b, and the extension portion 93c define a storage chamber 94 that is an annular space.

  The lip part 95 fixed to the tip part of the extension part 93c of the cored bar 93 is provided with seal lips 95b and 95c from the base part 95a inward and outward in the radial direction.

  The metal ring 89 is formed in an annular shape from a non-rusting material such as a stainless steel plate, and has a bottom wall 89e that is fitted and fixed to the outer peripheral surface of the step portion 13c of the flange portion 13b, and an inner surface of the flange portion 13b. A side wall 89d extending from one axial end of the bottom wall 89e and a side wall 89a extending from the other axial end of the bottom wall 89e substantially parallel to the inner surface of the flange portion 13b. And an overhanging portion 89b extending in the axial direction from the outer peripheral edge of the side wall 89a so as to cover the radially outer side of the outer peripheral surface 11d of the outer ring member 11, and the bottom wall 89e and the side wall 89a, 89d defines a seal groove 89c.

  A lip portion 91 made of an elastic member such as rubber is fixed to the projecting portion 89b of the metal ring 89. The lip portion 91 has seal lips 91a and 91b extending outward in the radial direction, and a tip end portion of the lip portion 91. A seal lip 91c extending in the axial direction is provided.

  Next, assembly of the hub unit 600 will be described with reference to FIG. As shown in FIG. 13A, a metal ring 89 having a lip portion 91 fixed to the step portion 13c of the hub 13 is externally fitted and fixed. On the other hand, the mounting portion 93a of the core metal 93 is fitted on the outer peripheral surface 11d of the outer ring member 11 to fix the non-contact type seal member 87, and the core metal 27 of the contact type seal member 23 is fixed on the inner peripheral surface 11c. Fit and fix. Further, cages 21 that hold a plurality of balls 17 in a freely rollable manner are respectively mounted on the two rows of outer ring raceway surfaces 11 a of the outer ring member 11, and the outer ring member 11 and the hub 13 are preliminarily assembled.

  Then, the outer ring member 11 is moved in the direction of the arrow in the drawing, and the outer ring member 11 is assembled to the hub 13 so that the lip portion 91 of the metal ring 89 is accommodated in the accommodation chamber 94 as shown in FIG. . The inner diameter ID4 of the seal lip 95b of the lip portion 95 of the non-contact type seal member 87 is set to be smaller than the outer diameter OD4 of the seal lips 91a and 91b of the seal member 91 of the metal ring 89 (see FIG. 12). Since both the seal lip 95b and the seal lips 91a and 91b are formed of an elastic material, they can be easily deformed and assembled.

  As shown in FIG. 12, in the state where the outer ring member 11 and the hub 13 are assembled, the non-contact type seal member 87 has a slight gap between the base portion 95a of the lip portion 95 and the seal lip 95c on the side wall 89d of the metal ring 89. The seal lip 91c of the lip portion 91 of the metal ring 89 is adjacent to the side wall 93b of the core metal 93 of the non-contact type seal member 87 to form a labyrinth. Further, the labyrinth is configured more complicatedly by the seal lips 91a and 91b of the lip portion 91 and the seal lip 95b of the lip portion 95. And it seals between the flange parts 13b in the radial direction outer side than the outer diameter of the said outer side part of the outer ring member 11.

  According to the hub unit 600 described above, the length of the labyrinth gap is long, and the labyrinth effect is enhanced with a complicated shape, and the sealing performance can be improved. Further, the gap between the end surface 11 b of the outer ring member 11 and the inner surface of the flange portion 13 b of the hub 13 facing the end surface 11 b is an extension portion 93 c of the core metal 93 of the non-contact type seal member 87 and an overhang portion 89 b of the metal ring 89. Therefore, even if foreign matter such as external muddy water or dust gets on the hub unit 600, the entry of foreign matter into the hub unit 600 is more reliably prevented.

  Other operations and effects are the same as the operations and effects of the hub units described in the above-described embodiments and their modifications.

  As shown in FIG. 14, in the hub unit 600, an annular auxiliary member 96 that fills the surplus space of the storage chamber 94 may be provided. Thereby, the labyrinth effect can be further enhanced. Further, a sealing member 97 made of an elastic member such as rubber may be provided between the attachment portion 93 a of the core metal 93 of the non-contact type sealing member 87 and the outer peripheral surface 11 d of the outer ring member 11. As a result, it is possible to prevent a slight amount of muddy water or the like entering from between the metal core 93 of the non-contact type seal member 87 and the outer peripheral surface 11d of the outer ring member 11, and an excellent sealing performance can be obtained.

(Seventh embodiment)
Next, a hub unit which is a seventh embodiment of the bearing device of the present invention will be described with reference to FIG. FIG. 15 is a sectional view of an essential part of a hub unit which is a seventh embodiment of the bearing device of the present invention.

  As shown in FIG. 15, the hub unit 700 of the seventh embodiment has many common points with the hub unit 100 of the first embodiment. The description is simplified or omitted.

  The sealing device 19 of the hub unit 700 includes a contact-type seal member 23 that is an annular first seal portion and a second seal portion 125.

  The second seal portion 125 has an annular cored bar 127 formed in a cross-sectional crank shape. The core metal 127 is bent in the axial direction from the mounting portion 127a that is fitted onto the outer peripheral surface 11d of the outer ring member 11, the rising portion 127c that is integrally raised from the mounting portion 127a in the radial direction, and the rising portion 127c. And an extended portion 127b extending in the direction of the flange portion 13b. The inner diameter of the extension portion 127b is larger than the inner diameter of the mounting portion 127a and larger than the outer diameter of the step portion 13c of the flange portion 13b.

  The core metal 127 is formed of a non-rusting plate material having a plate thickness of about 0.3 mm to 1.0 mm. As the non-rusting plate material, for example, a stainless steel plate, titanium, SPCC or the like iron plate made of a surface treatment such as plating to make it non-rusting, synthetic resin, etc. can be used, but a stainless steel plate is preferred. . For the stainless steel plate, a magnetic material such as SUS430 or SUS410 may be used. However, if a nonmagnetic material such as SUS304 is used, iron powder contained in external foreign matters is not adsorbed. The plate thickness is set to 0.3 mm to 1.0 mm. If the plate thickness is 0.3 mm or less, the mechanical strength is insufficient, and there is a risk of deformation when press-fitting to the outer peripheral surface 11d of the outer ring member 11. This is because there is a problem that it is difficult to process when the plate thickness is 1.0 mm or more.

  The second seal portion 125 has a lip portion 130 formed in an annular shape by an elastic material such as rubber such as NBR or synthetic resin. A base portion 130a is formed on the inner peripheral edge portion of the lip portion 130 to be fixed to the distal end portion of the extension portion 127b of the core metal 127, and a seal lip 130b that is formed to become thinner gradually toward the outer peripheral edge portion of the lip portion 130. 130a is formed continuously. The base portion 130a is fixed to the distal end portion of the extension portion 127b of the core metal 127 by integral molding or an adhesive.

  The second seal portion 125 is fixed by fitting the attachment portion 127a to the outer peripheral surface 11d of the outer ring member 11 with the seal lip 130b facing the flange portion 13b. The core metal 127 and the outer ring member 11 can be press-fitted easily by bringing a press-fitting jig into contact with the rising portion 127c of the crank-shaped core metal 127 having a cross-sectional shape and pressing it. The side surface of the rising portion 127c on the hub 13 side and the end surface 11b of the outer ring member 11 are flush with each other. At this time, the seal lip 130b of the lip portion 130 has a slight clearance from the inner surface of the flange portion 13b, for example, a clearance C4 of about 0 to 0.2 mm, and is not contacted at least when the relative rotation between the outer ring member 11 and the hub 13 is stopped. Further, the extension portion 127b and the lip portion 130 of the core metal 127 are disposed so as to overlap with the step portion 13c of the flange portion 13b in the axial direction.

  The second seal portion 125 forms a labyrinth with the seal lip 130b and the flange portion 13b, and covers the gap C3 between the inner surface of the flange portion 13b and the end surface 11b of the outer ring member 11 with the extension portion 127b. The outer ring member 11 is sealed with the flange portion 13b on the outer side in the radial direction from the outer diameter of the outer side portion.

  In addition, by setting the gap C3 between the end surface 11b of the outer ring member 11 and the inner side surface of the flange portion 13b facing the end surface 11b to be the same as the gap C4, the second labyrinth is configured and the labyrinth effect is obtained. You may make it raise further.

  According to the hub unit 700 described above, the sealing device 19 that seals the gap between the outer ring member 11 and the hub 13 is provided with the outer peripheral surface of the shoulder 13d of the hub 13 on the radially inner side of the outer diameter of the end of the outer ring member 11. And / or a contact-type seal member 23 that is a first seal portion that is slidably in contact with the inner surface of the flange portion 13b, and an inner portion of the flange portion 13b that is radially outside the outer diameter of the outer portion of the outer ring member 11. Since the second seal portion 125 that seals between the side surfaces is provided, the gap between the outer ring member 11 and the hub 13 can be sealed twice to improve the sealing performance.

  The contact-type seal member 23 is slidably contacted with the outer peripheral surface of the shoulder portion 13d of the hub 13 and / or the inner surface of the flange portion 13b on the radially inner side of the outer diameter of the outer portion of the outer ring member 11, and sealed. The second seal portion 125 seals between the outer surface of the outer ring member 11 and the inner surface of the flange portion 13b on the outer side in the radial direction from the outer diameter of the outer ring member 11, that is, the second seal portion 125 is a contact type seal member The seal lip 29a, 29b, 29c of the hub 23 and the outer peripheral surface of the shoulder portion 13d of the hub 13 and / or the inner surface of the flange portion 13b can be disposed at positions spaced from the bearing outward. Thereby, it is possible to make it difficult for foreign matter such as muddy water and dust that has passed through the second seal portion 125 to reach the sliding contact portion of the contact-type seal member 23, and to suppress the progress of rust to the sliding contact portion. can do. Therefore, it is possible to maintain good bearing performance over a long period of time.

  Further, at least when the relative rotation between the outer ring member 11 and the hub 13 is stopped, the seal lip 130b of the second seal portion 125 and the inner side surface of the flange portion 13b are not in contact with each other, and the contact type seal member 23 is outside the bearing. In the second seal portion 125, which is exposed to a poor environment due to being arranged on the side, and is likely to be insufficiently lubricated, when the rotation is stopped for a long time, the seal lip 130b of the second seal portion 125 is formed on the flange portion 13b. It is possible to prevent sticking to the inner surface, and thus the life of the second seal portion 125 can be extended.

  Further, the second seal portion 125 has the extension portion 127b and the lip portion 130 of the core metal 127 overlapped with the step portion 13c of the flange portion 13b in the axial direction, and the flange portion is formed by the extension portion 127b and the lip portion 130 of the core metal 127. Since the gap C3 between the inner surface of 13b and the end surface 11b of the outer ring member 11 is covered, direct contact of muddy water, dust or the like with the contact-type seal member 23 can be avoided. As a result, it is possible to effectively prevent foreign matters such as muddy water and dust from entering the bearing device and maintain good bearing performance.

  Other operations and effects are the same as those of the hub unit 100 of the first embodiment.

(Eighth embodiment)
Next, a hub unit which is an eighth embodiment of the bearing device of the present invention will be described with reference to FIG. FIG. 16 is a cross-sectional view of a main part of a hub unit which is an eighth embodiment of the bearing device of the present invention.

  As shown in FIG. 16, the hub unit 800 of the eighth embodiment has many common points with the hub unit 700 of the seventh embodiment, and only the form of the sealing device is different. Parts are denoted by the same or corresponding reference numerals, and the description thereof is simplified or omitted.

  The sealing device 131 includes an annular first seal portion 123 formed by fixing an elastic member 129 having seal lips 129 a, 129 b, and 129 c to the inner peripheral edge 133 a of the core metal 133, and the outer peripheral edge of the core metal 133. And a second seal portion 134 formed by fixing a lip portion 135 formed separately from the elastic member 129 to the portion 133b.

  A base portion 135a fixed to the outer peripheral edge portion 133b of the core metal 133 is formed on the inner peripheral edge portion of the lip portion 135, and a seal lip 135b that is gradually formed thinner toward the outer peripheral edge portion of the lip portion 135 is formed on the base portion 135a. It is formed continuously. The base portion 135a is fixed to the outer peripheral edge portion 133b of the core metal 133 by integral molding, an adhesive, or the like.

  The core metal 133 is an annular member formed of the above-described non-rusting material such as a stainless steel plate, and is axially formed in a substantially U-shaped cross section at an intermediate portion 133c between the inner peripheral edge portion 133a and the outer peripheral edge portion 133b. An annular fitting portion 133d that is bent so as to protrude is provided, and the inner diameter of the fitting portion 133d is substantially the same as the outer diameter of the outer peripheral surface 11d of the outer ring member 11.

  The sealing device 131 is configured so that the inner surface of the intermediate portion 133c of the core metal 133 is brought into contact with the end surface 11b of the outer ring member 11 and the fitting portion 133d of the core metal 133 is externally fitted to the outer portion of the outer ring member 11. The outer ring member 11 is fixed by being press-fitted into the outer side portion. Note that the outer side surface of the intermediate portion 133c is lateral (left side) so that a press-fitting jig (not shown) for press-fitting the core metal 133 (sealing device 131) into the outer portion of the outer ring member 11 can come into contact therewith. Open).

  The first seal portion 123 has seal lips 129 a, 129 b, and 129 c of the elastic member 129 fixed to the inner peripheral edge portion 133 a of the core metal 133 on the radially inner side of the outer diameter of the outer portion of the outer ring member 11. The outer peripheral surface of the shoulder portion 13d of the hub 13 and / or the inner side surface of the flange portion 13b are respectively slidably contacted and sealed.

  Further, the second seal portion 134 is configured such that the seal lip 135b of the lip portion 135 fixed to the outer peripheral edge portion 133b of the core metal 133 is slightly spaced from the inner surface of the flange portion 13b, for example, about 0 to 0.2 mm. At least when the relative rotation between the outer ring member 11 and the hub 13 is stopped, the gap C5 is disposed so as not to be in contact with the inner surface of the flange portion 13b on the radially outer side of the outer diameter of the outer portion of the outer ring member 11. It is sealed with.

  According to the hub unit 800 described above, the core bar of the first seal portion 123 and the core bar of the second seal portion 125 are integrally formed, so that the number of parts can be reduced and the assembly is performed. The number of steps can be reduced to facilitate the assembly, and the hub unit 800 can be manufactured at a low cost.

  Other operations and effects are the same as those of the hub unit 700 of the seventh embodiment.

  Next, a modification of the hub unit 800 of the eighth embodiment will be described with reference to FIG. FIG. 17 is an enlarged view of a main part of a hub unit which is a modified example of the eighth embodiment.

  As shown in FIG. 17, the hub unit 810 has many common points with the hub unit 800 of the eighth embodiment, and the only difference is the form of the core of the sealing device. Are denoted by the same or corresponding reference numerals, and the description thereof will be simplified or omitted.

  The sealing device 131 of the hub unit 810 includes an annular first seal portion 123 formed by fixing an elastic member 129 having seal lips 129a, 129b, and 129c to the inner peripheral edge portion 136a of the core metal 136, and the core metal. And a second seal portion 134 configured by fixing a lip portion 135 formed separately from the elastic member 129 to the outer peripheral edge portion 136b of 136.

  The core metal 136 is an annular member formed of the above-described non-rusting material such as a stainless steel plate, and is axially formed in a substantially U-shaped cross section in an intermediate portion 136c between the inner peripheral edge portion 136a and the outer peripheral edge portion 136b. An annular fitting portion 136d that is bent so as to protrude is provided, and the outer diameter of the fitting portion 136d is substantially the same as the inner diameter of the inner peripheral surface 11c of the outer ring member 11.

  The sealing device 131 is configured so that the inner surface of the intermediate portion 136c of the core metal 136 is brought into contact with the end surface 11b of the outer ring member 11 and the fitting portion 136d of the core metal 136 is fitted inside the outer portion of the outer ring member 11. The outer ring member 11 is fixed by being press-fitted into the outer side portion. The outer surface of the intermediate portion 136c is lateral (left side) so that a press-fitting jig (not shown) for press-fitting the core metal 136 (sealing device 131) into the outer portion of the outer ring member 11 can be brought into contact therewith. Open).

  The first seal portion 123 has seal lips 129 a, 129 b, and 129 c of the elastic member 129 fixed to the inner peripheral edge portion 136 a of the core metal 136 on the radially inner side of the outer diameter of the outer portion of the outer ring member 11. The outer peripheral surface of the shoulder portion 13d of the hub 13 and / or the inner side surface of the flange portion 13b are respectively slidably contacted and sealed.

  Further, the second seal portion 134 is configured such that the seal lip 135b of the lip portion 135 fixed to the outer peripheral edge portion 136b of the core metal 136 is slightly spaced from the inner surface of the flange portion 13b, for example, about 0 to 0.2 mm. At least when the relative rotation between the outer ring member 11 and the hub 13 is stopped, the gap C5 is disposed so as not to be in contact with the inner surface of the flange portion 13b on the radially outer side of the outer diameter of the outer portion of the outer ring member 11. It is sealed with.

  The operations and effects of the hub unit 810 described above are the same as the operations and effects of the hub unit 800 of the eighth embodiment.

  In the hub units 800 and 810 of the eighth embodiment and its modifications, the flange portion 13b of the hub 13 has been described as having no step portion 13c. However, the flange portion 13b may be provided with a step portion 13c. In this case, the gap between the inner side surface of the flange portion 13b and the end surface 11b of the outer ring member 11 is covered by overlapping the lip portion 135 of the second seal portion 134 with the step portion 13c in the axial direction. Direct hitting of muddy water, dust and the like on the member 23 can be avoided.

  Note that the present invention is not limited to the above-described embodiments and modifications, and modifications, improvements, and the like can be made as appropriate. In addition, the material, shape, dimension, numerical value, form, number, location, and the like of each component in the above-described embodiments and modifications are arbitrary and are not limited as long as the present invention can be achieved.

It is sectional drawing of the hub unit which is 1st Embodiment of the bearing apparatus of this invention. It is a principal part enlarged view in FIG. It is a principal part enlarged view which shows the 2nd seal part of the sealing device of the hub unit which is a modification of 1st Embodiment shown in FIG. It is principal part sectional drawing of the hub unit which is 2nd Embodiment of the bearing apparatus of this invention. FIG. 5 is an enlarged view of a portion surrounded by an ellipse V in FIG. 4. It is a principal part enlarged view of the hub unit which is a modification of 2nd Embodiment shown in FIG. It is principal part sectional drawing of the hub unit which is 3rd Embodiment of the bearing apparatus of this invention. It is principal part sectional drawing of the hub unit which is 4th Embodiment of the bearing apparatus of this invention. It is principal part sectional drawing of the hub unit which is 5th Embodiment of the bearing apparatus of this invention. It is principal part sectional drawing of the hub unit which is a modification of 5th Embodiment shown in FIG. It is sectional drawing of the hub unit which is 6th Embodiment of the bearing apparatus of this invention. FIG. 12 is an enlarged view of a portion surrounded by an ellipse XII in FIG. 11. 11 shows a procedure for assembling the hub unit shown in FIG. 11, wherein (a) is a sectional view of the hub unit before assembly, and (b) is a sectional view of the hub unit after assembly. It is principal part sectional drawing of the hub unit which is a modification of 6th Embodiment shown in FIG. It is principal part sectional drawing of the hub unit which is 7th Embodiment of the bearing apparatus of this invention. It is principal part sectional drawing of the hub unit which is 8th Embodiment of the bearing apparatus of this invention. It is principal part sectional drawing of the hub unit which is a modification of 8th Embodiment shown in FIG. It is principal part sectional drawing of the conventional hub unit.

Explanation of symbols

100 Hub unit (bearing device)
800 Hub unit (bearing device)
11 Outer ring member 13 Hub (inner ring member)
13b Flange part 13c Step part 17 Ball (rolling element)
19 Sealing device 23 Contact-type seal member (first seal part)
25 Non-contact seal member (second seal part)
27 Core metal 29a, 29b, 29c Seal lip 123 First seal part 129a, 129b, 129c Seal lip 131 Sealing device 133 Core metal 134 Second seal part 135 Lip part

Claims (4)

An outer ring member; an inner ring member that is rotatable relative to the outer ring member via a plurality of rolling elements; and an outer ring member and the inner ring member fixed to the outer ring member at an axially outer side portion of the outer ring member. An annular sealing device that seals the gap of
The inner ring member has a flange-like flange portion that spreads radially outward from the outer diameter of the outer portion of the outer ring member;
The sealing device comprises:
A first seal portion that is slidably in contact with an outer peripheral surface of the inner ring member and / or an inner side surface of the flange portion that is continuous with the outer peripheral surface at a radially inner side than an outer diameter of the outer portion of the outer ring member; ,
A second seal portion that seals between the outer surface of the outer ring member and the inner side surface of the flange portion at a radially outer side than an outer diameter of the outer portion;
A bearing device characterized by comprising:   The second seal portion is separated from the inner side surface of the flange portion with a slight gap in the axial direction at least when the relative rotation between the outer ring member and the inner ring member is stopped. Item 2. The bearing device according to Item 1. On the inner surface of the flange portion, a step portion that forms a step in the radial direction over the entire circumference is provided,
The bearing device according to claim 1, wherein the second seal portion overlaps the stepped portion in the axial direction. The first seal portion includes a cored bar, and an elastic seal lip that is fixed to the cored bar and is in sliding contact with the outer peripheral surface of the inner ring member and / or the inner side surface of the flange unit,
The second seal portion has at least a cored bar,
4. The bearing device according to claim 1, wherein the core metal of the first seal portion and the core metal of the second seal portion are integrally formed. 5.

Images