JP2011080499A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device having improved sealability by improving the air tightness of a seal fitting part. <P>SOLUTION: A seal 9 is formed as a pack seal consisting of a slinger 11 and an annular seal plate 12 arranged opposing each other. The end of a cylindrical portion 14a of a core metal 14 is formed thinner than other portions with its diameter reduced, and a seal member 15 is turned around the outer surface thereof to form an opening end 16. On the outer diameter face of the opening end 16, a cylindrical annular edge 16b and an annular protruded portion 16a to be pressed into an end inner diameter face 10c of an outward member 10 are formed. The volume of an annular escape portion A formed between the annular edge 16b and a chamfered portion 10d on the end inner periphery of the outward member 10 is set larger than a fitting volume B of the annular protruded portion 16a. Thus, when the seal 9 is pressed therein, the opening end 16 of the seal member 15 is prevented from rising up from an end face 10e of the outward member 10 to prevent the cracking of the opening end 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device. More specifically, the present invention improves the airtightness of a fitting portion of a seal attached to the bearing portion and improves the sealing performance. The present invention relates to a wheel bearing device.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

  These bearing portions are fitted with seals to prevent leakage of grease sealed inside the bearings and to prevent intrusion of rainwater, dust and the like from the outside. In recent years, the maintenance of automobiles has become more maintenance-free, and even longer bearing life has been demanded for wheel bearing devices. However, there are many cases in which rainwater, dust, or the like intrudes into the bearing and damages the bearing due to a sealing failure or a decrease in sealing performance. Therefore, it is possible to improve the bearing life by improving the sealing performance of the seal.

  Conventionally, various seals with improved sealing performance have been proposed. A typical example of such a seal is shown in FIG. The seal 50 is attached to an end of the outer member 51 and seals an opening of an annular space formed between the outer member 51 and the inner ring 52. The seal 50 includes a slinger 53 and an annular seal plate 54 that are arranged to face each other. The slinger 53 has a substantially L-shaped cross section formed by pressing from a steel plate, and includes a cylindrical portion 53a that is press-fitted into the inner ring 52, and a standing plate portion 53b that extends radially outward from the cylindrical portion 53a. .

  On the other hand, the seal plate 54 has a substantially L-shaped cross section, and includes a cored bar 55 and a seal member 56 vulcanized and bonded to the cored bar 55. The metal core 55 is formed of a steel plate by press working, and includes a cylindrical portion 55a that is fitted in an end portion of the outer member 51, and a standing plate portion 55b that extends radially inward from the cylindrical portion 55a. . The seal member 56 is made of an elastic member, and includes a side lip 56a that is in sliding contact with the standing plate portion 53b of the slinger 53, and radial lips 56b and 56c that are in sliding contact with the cylindrical portion 53a. The side lip 56 a is formed so as to be inclined toward the outer diameter side from the standing plate portion 55 b of the core metal 55, and the tip is in sliding contact with the standing plate portion 53 b of the slinger 53 with a predetermined squeeze.

  Further, the seal member 56 wraps around and is fixed to the outer surface of the cylindrical portion 55a of the metal core 55, and is brought into close contact with the fitting portion with the outer member 51 to improve airtightness. Further, the labyrinth seal 57 is configured by causing the outer edge of the standing plate portion 53b of the slinger 53 and the cored bar 55 to face each other through a slight radial clearance so that rainwater, dust, or the like directly falls on the side lip 56a from the outside. Prevents and improves sealing performance.

  Here, the outer diameter surface 52a of the inner ring 52 in which the slinger 53 and the metal are fitted to each other, or the inner diameter surface 51a of the core metal 55 and the outer member 51 has an unevenness (chatter) height of 2 by plunge cut grinding. It is regulated to 5 μm or less. Thereby, not only the sealing performance of the seal 50 itself, but also the airtightness of the seal fitting portion can be improved, and the sealing performance can be improved (for example, see Patent Document 1).

JP 2008-25645 A

  In such a conventional seal 50, the seal member 56 is fixed around the outer surface of the cylindrical portion 55a of the cored bar 55. Therefore, when the seal member 56 is press-fitted into the outer member 51 with the seal press-fitting jig 58, FIG. As shown, the end of the seal member 56 rises from the end surface 51 b of the outer member 51, and this raised portion may be sandwiched between the seal press-fitting jig 58 and the end surface of the outer member 51 and may be damaged. In this case, it is difficult to maintain high airtightness even if the unevenness height of the inner diameter surface 51a that is metal-fitted to the metal core 55 is regulated to 2.5 μm or less.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a wheel bearing device in which the airtightness of the seal fitting portion is improved and the sealing performance is improved.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and an outer rolling of the double row on the outer periphery. An inner member in which a double row inner rolling surface facing the surface is formed, and a double row accommodated between the rolling surfaces of the inner member and the outer member via a retainer so as to roll freely. In the wheel bearing device comprising: a rolling element; and a seal mounted at both ends of an annular space formed between the outer member and the inner member, at least one of the seals is A metal core comprising a cylindrical portion fitted into the end portion of the outer member, and a standing plate portion extending radially inward from the cylindrical portion, and a synthetic rubber seal vulcanized and bonded to the metal core A member, and the seal member wraps around the outer surface of the end portion of the cylindrical portion of the cored bar to the inner diameter surface of the end portion of the outer member An annular convex portion that is press-fitted through a fixed shimeiro and a cylindrical annular edge having an annular relief portion on the inner diameter surface of the outer member are formed, and the volume of the relief portion is determined by the annular convex portion. It is set larger than the fitting volume of the part.

  As described above, in the wheel bearing device including the seals mounted on the opening portions at both ends of the annular space formed between the outer member and the inner member, at least one of the seals is the outer member. A cylindrical portion fitted inside the end portion, a cored bar made of a standing plate extending radially inward from the cylindrical unit, and a synthetic rubber sealing member vulcanized and bonded to the cored bar, An annular convex portion that is inserted into the end inner diameter surface of the outer member through a predetermined shimoshiro by the seal member around the outer surface of the end portion of the cylindrical portion of the core metal, and the end inner diameter surface of the outer member A cylindrical annular edge having an annular relief portion is formed, and the volume of the relief portion is set to be larger than the fitting volume of the annular convex portion. The open end of the member is raised from the end face of the outer member, and this raised portion is Chromatography is sandwiched between the end face open end of Le stuffing jig and the outer member can be prevented from Sonsuru split. Thereby, the wheel bearing apparatus which improved the airtightness of the seal fitting part and improved the sealing performance can be provided.

  Preferably, as in the invention described in claim 2, if the end of the cylindrical portion of the core metal is formed to be thinner and reduced in diameter than the other portions, the fixing force of the seal member becomes stronger and longer. The airtightness of the fitting portion with the outer member can be maintained over a period.

  If the chamfered portion of the outer member is formed by grinding as in the third aspect of the invention, the press-fit property is improved and the seal member can be prevented from rising during press-fitting.

  In addition, as in the invention described in claim 4, if the connecting portion between the end inner diameter surface of the outer member and the chamfered portion is formed in an arc shape having a predetermined radius of curvature, the connecting portion is smooth. Thus, the press-fitting property is further improved and the seal member can be prevented from being raised during press-fitting.

  Further, as in the invention described in claim 5, if the inner diameter surface of the end portion and the chamfered portion including at least the connecting portion are simultaneously ground by a grindstone, the inner diameter surface of the end portion and the chamfer The connecting portion with the portion is formed more smoothly.

  In addition, as in the invention described in claim 6, if an arc-shaped chamfered portion having a predetermined radius of curvature is formed at a corner portion on the press-fitting side of the annular convex portion, the press-fitting property of the seal is improved. Thus, it is possible to prevent the opening end from being raised at the time of press-fitting.

  Moreover, if the chamfering part is formed in the corner | angular part of the said cyclic | annular edge like invention of Claim 7, the volume of a cyclic | annular relief part is securable.

  Further, as in the invention described in claim 8, if the end face width of the opening end is set to 0.6 mm or more, the contact area with the seal press-fitting jig is increased, and the press-fit property of the seal is further increased. Can be improved.

  According to a ninth aspect of the present invention, the seal is composed of a pack seal composed of a slinger and an annular seal plate arranged to face each other, and the slinger is externally fitted to the inner member. A cylindrical portion and a standing plate portion extending radially outward from the cylindrical portion, and formed into an annular shape as a whole in a substantially L-shaped cross section by pressing from a steel plate; A side lip that is slidably in contact with the upright plate portion of the slinger via an axial shimeshiro, and a radial lip that is slidably in contact with the cylindrical portion of the slinger via a radial shimeshiro And the sealing performance can be improved.

  According to a tenth aspect of the present invention, a magnetic encoder is integrally joined to the side surface of the upright plate portion by vulcanization adhesion, and the magnetic encoder is mixed with elastomer powder and alternately in the circumferential direction. Magnetic poles N and S are magnetized, and the magnetic encoder wraps around and is fixed to the outer diameter portion of the upright plate portion, and a slight radial clearance is provided between the outer diameter and the opening end of the seal member. If the labyrinth seal is configured to face each other, it is possible to prevent rainwater, dust, and the like from directly falling on the side lip from the outside, and to further improve the sealing performance.

  The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, and a double row inner rolling that faces the outer rolling surface of the double row on an outer periphery. An inner member having a surface formed thereon, a double row rolling element housed between the rolling surfaces of the inner member and the outer member via a cage, and the outer member; In a wheel bearing device including a seal attached to an opening of an annular space formed between the inner member and at least one of the seals is fitted into an end of the outer member. And a cored bar made of a standing plate extending radially inward from the cylindrical part, and a synthetic rubber sealing member vulcanized and bonded to the cored bar, the cylindrical part of the cored bar The sealing member wraps around the outer surface of the end portion of the end portion to form an opening end portion, and the outer end surface of the opening end portion is cylindrical. An annular end edge and an annular convex portion that is press-fitted through a predetermined shimeshiro to the end inner diameter surface of the outer member are formed, and between the annular end edge and the chamfered portion on the inner periphery of the end portion of the outer member. Since the volume of the formed annular relief portion is set larger than the fitting volume of the annular convex portion, when the seal is press-fitted by the seal press-fitting jig, the opening end portion of the seal member is the outer member It is possible to prevent the raised end from being broken and the raised end from being sandwiched between the seal press-fitting jig and the end face of the outer member, and breaking the open end. Thereby, the wheel bearing apparatus which improved the airtightness of the seal fitting part and improved the sealing performance can be provided.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view which shows the seal part of FIG. It is explanatory drawing which shows the processing method of an outward member. (A) is a principal part enlarged view which shows the modification of the seal | sticker of FIG. 2, (b) is a principal part enlarged view of (a). It is a principal part enlarged view which shows the seal part of the conventional wheel bearing apparatus. It is explanatory drawing which shows the state at the time of the seal press injection of FIG.

  A body mounting flange for mounting to the suspension device on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel having an outer periphery and one inner rolling surface facing the outer rolling surface of the double row, and a small-diameter step portion extending in an axial direction from the inner rolling surface, and the hub wheel An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member. A double-row rolling element accommodated between the running surfaces via a cage, and a seal attached to an opening in an annular space formed between the outer member and the inner member. In the wheel bearing device provided, at least one of the seals is opposed to each other. The slinger includes a cylindrical portion that is externally fitted to the inner member, and a vertical plate portion that extends radially outward from the cylindrical portion. The steel plate is formed into an annular shape as a whole by press working from a steel plate, and the seal plate is fitted into the end of the outer member, and the cylindrical portion. A cored bar made of a vertical plate extending inward in the radial direction, a side lip that is vulcanized and bonded to the cored bar and is slidably contacted with the vertical plate of the slinger via an axial shimiro, and a diameter of the cylindrical part of the slinger A seal member made of a synthetic rubber having a radial lip that is slidably contacted via a direction shimoshiro. The end portion of the cylindrical portion of the core metal is formed with a smaller diameter and a smaller diameter than the other portion. The seal member wraps around the surface and opens Are formed on the outer diameter surface of the opening end portion, and a cylindrical annular end edge and an annular convex portion that is press-fitted into the end inner diameter surface of the outer member through a predetermined shimiro, The volume of the annular relief portion formed between the annular edge and the chamfered portion on the inner periphery of the end of the outer member is set larger than the fitting volume of the annular convex portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing a seal part of FIG. 1, and FIG. 3 shows a method for processing an outer member. 4A is an explanatory view, FIG. 4A is an enlarged view of a main part showing a modification of the seal of FIG. 2, and FIG. 4B is an enlarged view of the main part of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device is for a drive wheel, and includes an inner member 1 and an outer member 10, and double row rolling elements (balls) 7 and 7 accommodated between the members 1 and 10 so as to be freely rollable. The third generation is configured. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted and fixed to the hub ring 2.

  The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel at one end portion, one (outer side) inner rolling surface 2a on the outer periphery, and a cylinder extending in the axial direction from the inner rolling surface 2a. A small diameter step 2b is formed, and a serration (or spline) 2c for torque transmission is formed on the inner periphery. Further, hub bolts 5 are planted in the circumferentially equidistant positions of the wheel mounting flanges 4. The inner ring 3 is formed with the other (inner side) inner rolling surface 3a on the outer periphery, and is press-fitted into the small-diameter step portion 2b of the hub ring 2 through a predetermined squeeze.

  The hub wheel 2 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the wheel mounting flange 4 serving as a seal land portion of the outer side seal 8 to be described later, including the inner rolling surface 2a. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base 4a to the small diameter step 2b. On the other hand, the inner ring 3 and the rolling element 7 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching.

  The outer member 10 integrally has a vehicle body mounting flange 10b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 2a and 3a of the inner member 1 on the inner periphery. Opposing double-row outer rolling surfaces 10a and 10a are integrally formed. Between these rolling surfaces 10a, 2a and 10a, 3a, double row rolling elements 7, 7 are accommodated via a cage 6 so as to roll freely. This outer member 10 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least double row outer raceway surfaces 10a and 10a are surfaced in the range of 58 to 64HRC by induction hardening. Has been cured.

  Seals 8 and 9 are attached to both ends of the outer member 10 to seal the opening of the annular space formed between the outer member 10 and the inner member 1. The seals 8 and 9 prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing.

  Here, the seal 9 on the inner side of the seals 8 and 9 is constituted by a so-called pack seal composed of a slinger 11 and an annular seal plate 12 arranged to face each other as shown in an enlarged view in FIG. Yes. The slinger 11 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), an austenitic stainless steel plate (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system). Etc.) and a cylindrical portion 11a which is formed in an annular shape as a whole in a substantially L-shaped section by press working, and which is press-fitted into the inner ring 3, and a standing plate portion 11b extending radially outward from the cylindrical portion 11a Consists of. Thereby, the rusting of the slinger 11 can be prevented and the durability of the seal 9 can be improved.

  Here, the magnetic encoder 13 is integrally joined to the inner side surface of the upright plate portion 11b by vulcanization adhesion. This magnetic encoder 13 constitutes a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and alternately magnetizing magnetic poles N and S in the circumferential direction. Then, the magnetic encoder 13 goes around and is fixed to the outer diameter portion of the standing plate portion 11b, and the outer diameter and the opening end portion 16 of the seal member 15 are opposed to each other through a slight radial clearance to form a labyrinth seal. 17 is configured. Thereby, it is possible to prevent rainwater or dust from directly falling on the side lip 15a from the outside, and to improve the sealing performance.

  On the other hand, the seal plate 12 is formed in an annular shape as a whole with a substantially L-shaped cross section, and is attached to the outer member 10. The seal plate 12 includes a metal core 14 and a seal member 15 vulcanized and bonded to the metal core 14. The core 14 is formed by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). 10 includes a cylindrical portion 14a fitted inside the end portion 10 and a standing plate portion 14b extending radially inward from the cylindrical portion 14a.

  The seal member 15 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and has a side lip 15a extending obliquely outward in the radial direction and a grease lip extending inclined in a bifurcated manner on the inner diameter side of the side lip 15a. 15b and a dust strip 15c. The side lip 15a is slidably in contact with the standing plate portion 11b of the slinger 11 via a predetermined axial shimiro, and the grease lip 15b and the dust lip 15c are slidably in contact with the cylindrical portion 11a via a radial shimiro respectively. In addition to NBR, the material of the seal member 15 includes, for example, HNBR (hydrogenated acrylonitrile-butadiene rubber), EPM, EPDM (ethylene / propylene rubber), etc., which have excellent heat resistance, heat resistance and chemical resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in properties.

  Further, the end of the cylindrical portion 14a of the cored bar 14a is formed thinner than the other portions and has a reduced diameter. And the sealing member 15 wraps around the outer surface of the end portion of the cylindrical portion 14a to form an open end portion 16. Thereby, the adhering force of the seal member 15 is strengthened, and the airtightness of the fitting portion with the outer member 10 can be maintained over a long period of time.

  Here, in this embodiment, an annular convex portion 16 a and a cylindrical annular edge 16 b are formed on the outer diameter surface of the opening end portion 16 of the seal member 15. The annular convex portion 16a is press-fitted into the end inner diameter surface 10c of the outer member 10 through a predetermined squeeze. An annular relief portion (shown by cross-hatching in the figure) 18 is formed between the annular edge 16b and the chamfered portion 10d on the inner periphery of the end portion of the outer member 10. The volume A of the annular relief portion 18 is set larger than the fitting volume B of the annular convex portion 16a. As a result, when the seal 9 is press-fitted by a seal press-fitting jig (not shown), the opening end portion 16 of the seal member 16 is raised from the end surface 10e on the inner side of the outer member 10, and this raised portion is seal press-fitted. It is possible to prevent the opening end portion 16 from being broken by being sandwiched between the jig and the end surface 10 e of the outer member 10. Thereby, the wheel bearing apparatus which improved the airtightness of the seal fitting part and improved the sealing performance can be provided.

  Next, the processing method of the outer member 10 is demonstrated using FIG. In the present embodiment, the connecting portion 18 between the chamfered portion 10d on the inner periphery of the end portion of the outer member 10 and the inner diameter surface 10c of the end portion is formed in an arc shape having a predetermined curvature radius R. The end inner diameter surface 10c and the chamfered portion 10d including at least the connecting portion 18 are simultaneously ground by the grinding wheel 19 of a total type. Thereby, the connection part 18 of the edge part internal diameter surface 10c and the chamfering part 10d is formed smoothly, the press fit property of the opening edge part 16 of the sealing member 15 improves, and the protrusion at the time of press fit can be prevented.

  In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball for the rolling element 7 was illustrated here, this invention is not limited to this, The double row using the tapered roller for the rolling element 7 You may be comprised with the tapered roller bearing. Furthermore, it is not limited to the illustrated third generation structure, but may be a first, second generation structure, or a fourth generation structure.

  FIG. 4A shows a modification of FIG. Note that this embodiment basically differs from the above-described embodiment only in the configuration of a part of the seal member, and other parts having the same parts or the same functions as the above-described embodiments are denoted by the same reference numerals. Detailed description is omitted.

  The seal 20 includes a slinger 11 and an annular seal plate 21 that are arranged to face each other. The annular seal plate 21 has a substantially L-shaped cross section, and includes a cored bar 14 and a seal member 22 vulcanized and bonded to the cored bar 14. And the annular convex part 23a and the cylindrical annular edge 23b are formed in the outer-diameter surface of the opening edge part 23 of this sealing member 22. As shown in FIG. The annular convex portion 23a is press-fitted into the end inner diameter surface 10c of the outer member 10 through a predetermined squeeze.

  Here, in the present embodiment, as shown in an enlarged view in (b), an arc-shaped chamfered portion 24 having a predetermined radius of curvature r is formed at a corner portion on the press-fitting side of the annular convex portion 23a, and an annular shape is formed. A chamfered portion 25 having a square surface is formed at a corner portion of the end edge 23b. Thereby, the volume of the annular relief portion 18 can be ensured, the press-fitting property of the seal 20 can be improved, and the bulge of the opening end portion 23 at the time of press-fitting can be further prevented.

  Further, the end face width H of the open end 23 is set to 0.6 mm or more. Thereby, the contact area with a seal press-fitting jig (not shown) is increased, and the press-fit property of the seal 20 can be further improved.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device according to the present invention can be applied to first to fourth generation wheel bearing devices having a pack seal.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Hub wheel 2a, 3a Inner rolling surface 2b Small diameter step part 2c Serration 3 Inner ring 3b Outer diameter surface 4 Wheel mounting flange 4a Base part of the inner side of a wheel mounting flange 5 Hub bolt 6 Cage 7 Rolling element 8 Outer side Seals 9, 20 Inner side seal 10 Outer member 10a Outer rolling surface 10b Car body mounting flange 10c Outer member inner diameter surface 10d Outer member chamfered portion 10e Outer member end surface 11 Slinger 11a, 14a Cylinder Portions 11b and 14b Standing plate portions 12 and 21 Seal plate 13 Magnetic encoder 14 Metal cores 15 and 22 Seal member 15a Side lip 15b Grease lip 15c Dustrips 16 and 23 Open end portions 16a and 23a of the seal member Annular convex portions 16b and 23b Annular edge 17 Labyrinth seal 18 Escape part 19 Grinding wheel 24 Chamfered part of annular convex part 25 Chamfered portion 50 of annular end edge Seal 51 Outer member 51a Inner diameter surface 51b End surface 52 Inner ring 52a Outer diameter surface 53 Slinger 53a, 55a Cylindrical portion 53b, 55b Standing plate portion 54 Seal plate 55 Core metal 56 Seal member 56a Side lip 56b 56c Radial lip 57 Labyrinth seal 58 Seal press-fitting jig A Relief volume B Fitting volume H Open end width

Claims (10)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
In a wheel bearing device comprising a seal mounted at both ends of an annular space formed between the outer member and the inner member,
At least one of the seals is a cored bar made up of a cylindrical part fitted inside the end part of the outer member, and a standing plate part extending radially inward from the cylindrical part, and is added to the cored bar. And a synthetic rubber seal member bonded with sulfur,
An annular convex portion that is inserted into the outer surface of the end portion of the outer member through a predetermined squeeze, and the end portion of the outer member. A wheel bearing device, characterized in that a cylindrical annular edge having an annular relief portion on an inner diameter surface is formed, and a volume of the relief portion is set larger than a fitting volume of the annular convex portion. .   The wheel bearing device according to claim 1, wherein an end portion of the cylindrical portion of the core metal is formed to be thinner and reduced in diameter than other portions.   The wheel bearing device according to claim 1 or 2, wherein the chamfered portion of the outer member is formed by grinding.   The wheel bearing device according to any one of claims 1 to 3, wherein a connecting portion between the inner diameter surface of the end portion of the outer member and the chamfered portion is formed in an arc shape having a predetermined radius of curvature.   The wheel bearing device according to claim 4, wherein the inner diameter surface of the end portion and the chamfered portion including at least the connecting portion are simultaneously ground by a grindstone.   The wheel bearing device according to claim 1, wherein an arc-shaped chamfered portion having a predetermined radius of curvature is formed at a corner portion on the press-fitting side of the annular convex portion.   The wheel bearing device according to claim 1, wherein a chamfered portion is formed at a corner portion of the annular edge.   The wheel bearing device according to claim 1, wherein an end face width of the opening end portion is set to 0.6 mm or more.   The seal is composed of a pack seal composed of a slinger and an annular seal plate arranged to face each other, and the slinger is externally fitted to the inner member, and radially outward from the cylindrical portion. The seal plate is formed by the core metal and the seal member, and the seal plate is formed by the core metal and the seal member. 2. The wheel for a vehicle according to claim 1, further comprising: a side lip that is in sliding contact with an upright plate portion of the slinger via an axial shimeshiro; and a radial lip that is in sliding contact with the cylindrical portion of the slinger via a radial shimeshiro. Bearing device.   A magnetic encoder is integrally joined to the side surface of the upright plate portion by vulcanization adhesion. This magnetic encoder is mixed with elastomer powder, and magnetic poles N and S are alternately magnetized in the circumferential direction. A labyrinth seal is constituted by a magnetic encoder that is wound around and fixed to an outer diameter portion of the upright plate portion, and the outer diameter and the opening end portion of the seal member are opposed to each other through a slight radial clearance. Item 10. A wheel bearing device according to Item 9.

Images