JP2009191858A - Seal for wheel bearing device, and wheel bearing device assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal for a wheel bearing device having improved sealing performance and durability for actualizing the longer operating life of a bearing, and to provide a wheel bearing device assembling method. <P>SOLUTION: The seal 9 for the wheel bearing device comprises a seal plate 17 consisting of a core metal 19 having a cylindrical fitting portion 19a to be pressed into the end inner periphery of an outward member 5 and an inner diameter portion 19b extending radially inward, and a seal member 20 integrally bonded to the core metal 19 and having a side lip 20a obliquely extending radially outward, and a slinger 18 formed in an approximately L-sectional shape and having a cylindrical portion 18a to be pressed into the outer diameter of an inner ring 2 and a rising plate portion 18b extending radially outward, the side lip 20a having sliding contact with the rising plate portion 18b of the slinger 18. The deformed condition of the core metal 19 when pressed thereinto is previously verified, and the inner diameter portion 19b of the core metal 19 is formed at an obtuse angle a predetermined inclination angle α than at a right angle to the fitting portion 19a, in consideration of the deformation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seal for a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and a method for assembling the wheel bearing device. The present invention relates to a seal for a wheel bearing device and a method for assembling the wheel bearing device for improving durability and extending the life of the bearing.

  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, the damage due to the sealing failure is a major factor. Therefore, the bearing life can be reliably improved by enhancing the sealing performance and durability of the seal.

  Conventionally, various types of seals with improved sealing performance have been proposed. A typical example of such a seal is shown in FIG. This seal 50 is attached to a housing 51 as two members that are concentrically assembled to each other so as to be relatively rotatable, and a sleeve that is attached to a rotating shaft 52 that is inserted into the housing 51 and rotates integrally with the rotating shaft 52. The annular gap between the members 53 is sealed.

  The seal 50 includes a metal ring 54 having a hollow hole formed by pressing a metal plate material by pressing or the like, and an elastic member 55 in which rubber or the like is fixed to the metal ring 54 by baking or bonding. This elastic member 55 has a main lip 55 a as a part, and the main lip 55 a slidably contacts with the outer peripheral surface of the sleeve portion 53 b of the sleeve member 53, and between the housing 51 and the rotating shaft 52. The annular gap is sealed to the sealed fluid side O and the atmosphere side A. Further, a tongue-shaped dust lip 55b is provided continuously with the main lip 55a, extends to the atmosphere side A, and is formed so as to be slidably contacted with the flange portion 53a of the sleeve member 53 by tilting radially outward. The muddy water from the side A is prevented from entering the inside.

  The metal ring 54 has a cylindrical portion 54a extending in the axial direction and an annular portion 54b bent from the end of the cylindrical fluid 54a toward the inner diameter side from the end of the sealed fluid side O. A main lip 55a and a dust lip 55b are continuously fixed to the surface of the side A by an elastic member 55.

  And since the clearance gap between the outer peripheral surface of the sleeve member 53 and the inner peripheral surface of the housing 51 is small, it is difficult to ensure the space for providing the elastic member 55 in the outer peripheral surface of the cylindrical part 54a of the metal ring 54. The outer peripheral surface of the cylindrical portion 54 a is directly fitted to the inner peripheral surface of the housing 51, and the seal 50 is fixed to the housing 51.

  Here, a tapered portion 51a is provided at the edge of the opening of the housing 51, and the elastic member 55 further seals the tapered portion 51a in a predetermined range of the end portion on the atmosphere side A of the cylindrical portion 54a. The edge seal portion 55c is fixed as a part of the elastic member 55. FIG. 5A is an enlarged view of the portion B, and FIG. 5B shows the end seal portion 55c having a portion protruding outward from the outer peripheral surface of the cylindrical portion 54a of the metal ring 54. The protruding portion seals the tapered portion 51 a of the opening of the housing 51. The shape of the protruding portion is made as similar as possible to the shape of the tapered portion 51a of the housing 51 so that the protruding portion when the seal 50 is attached to the housing 51 can easily follow the shape of the tapered portion 51a.

  The predetermined range is such that the contact area and the contact pressure according to the use environment can be secured by the width of the seal 50, the fitting between the housing 51 and the cylindrical portion 54a, etc., and the seal 50 does not come out of the housing 51. The width of the cylindrical portion 54 a is set in a range not covered with the elastic member 55.

  Further, a concave portion 54c is provided at the end surface portion of the cylindrical portion 54a of the metal ring 54 so that the elastic member 55 can be accurately fixed, and the base end portion of the edge seal portion 55c protrudes from the outer peripheral surface of the cylindrical portion 54a. When the seal 50 is attached to the housing 51, it is prevented from being peeled off.

By adopting such a configuration, the tapered portion 51 a that is normally provided at the edge of the opening facing the mounting portion of the seal 50 provided in the metal housing 51 is replaced with the edge seal portion 55 c of the elastic member 55 of the seal 50. Therefore, the leakage of the sealing fluid between the housing 51 and the seal 50 can be prevented.
JP 2004-18865 A

  Such a conventional seal 50 is mounted with a pressure input that provides a predetermined pulling strength so that it does not come out due to an increase in the internal pressure of the bearing during operation. That is, in this type of seal 50, as shown in FIG. 6A, the metal ring 54 and the sleeve member 53, in which the elastic member 55 is integrally joined, are set so that the shim of the dust lip 55b does not change. In this state, it is press-fitted into an opening of an annular space formed between the housing 51 and the rotating shaft 52.

  However, when the seal 50 is press-fitted, as shown in FIG. 5B, the metal ring 54 press-fitted into the housing 51 may be deformed from a single state due to the influence of the squeeze (two-dot chain line in the figure). ). Due to the deformation of the annular portion 54b, not only the dust lip 55b but also the contact state of the main lip 55a changes, and the sealing performance of the seal 50 may be lowered. When such a seal 50 is used in a bearing portion of a wheel bearing device that is exposed to a poor environment, muddy water or the like from the outside enters the inside of the bearing, and it is difficult to ensure a long life of the bearing.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems. The seal for a wheel bearing device and the assembly of the wheel bearing device for the wheel are designed to improve the sealing performance and durability of the seal to extend the life of the bearing. It aims to provide a method.

  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. A rolling element, and a seal formed of an annular seal plate and a slinger mounted in an opening of an annular space formed between the outer member and the inner member, and arranged opposite to each other. A metal core comprising a cylindrical fitting portion press-fitted into the inner periphery of the end of the outer member, and an inner diameter portion extending radially inward from the fitting portion, and vulcanization adhesion to the metal core And a cylindrical member into which the slinger is press-fitted into the outer diameter of the inner member. It is formed in a substantially L-shaped cross section consisting of a standing plate portion extending radially outward from the cylindrical portion, and the seal member extends in a radially outward direction and is slidably contacted with the standing plate portion of the slinger. In a seal of a wheel bearing device in which a labyrinth seal is configured by having a side lip and the upright plate portion is opposed to the seal plate through a slight radial clearance, the deformed state when the cored bar is press-fitted is It is verified in advance, and assuming the deformation, the inner diameter portion of the cored bar is formed to have an obtuse angle by a predetermined inclination angle rather than a right angle with respect to the fitting part of the cored bar.

  As described above, the seal plate is provided with an annular seal plate and a slinger that are attached to the opening of the annular space formed between the outer member and the inner member and arranged to face each other. A metal core comprising a cylindrical fitting portion press-fitted into the inner periphery of the end of the outer member, and an inner diameter portion extending radially inward from the fitting portion, and the metal core are integrally joined by vulcanization adhesion The slinger is formed in a substantially L-shaped cross section including a cylindrical portion press-fitted into the outer diameter of the inner member and a standing plate portion extending radially outward from the cylindrical portion. The member has a side lip that extends obliquely outward in the radial direction and is slidably contacted with the standing plate portion of the slinger, and the standing plate portion is opposed to the seal plate through a slight radial clearance to form a labyrinth seal. Press-fit of the metal core in the seal of the configured wheel bearing device Since the deformation state is verified in advance, and assuming the deformation, the inner diameter part of the cored bar is formed to be obtuse by a predetermined inclination angle rather than a right angle with respect to the fitting part of the cored bar, Even if the fitting part is compressed when the mandrel is press-fitted and the inner diameter part is deformed in the direction of the slinger, the side lip shimoshiro can be set as designed, improving the sealing performance and durability of the seal. Thus, it is possible to provide a wheel bearing device that extends the life of the bearing.

  Preferably, as in the invention according to claim 2, the end of the fitting portion of the cored bar is reduced in diameter, and the sealing member is joined from the outer periphery to the inner diameter so as to cover the end. If it is done, the fitting surface between the outer member and the cored bar can be sealed with the seal member, and rainwater, dust, etc. can be prevented from entering the inside of the bearing from the fitting surface.

  Further, as in the invention according to claim 3, if the slinger is formed by pressing from a ferromagnetic steel plate having rust prevention ability, even if the slinger is exposed to rain water, muddy water, or the like, In addition, it is possible to prevent the slinger from rusting even if rainwater or muddy water enters the fitting part, and when the magnetic encoder is integrally joined to the side of the slinger, the output signal becomes stronger and stable. The detected accuracy can be ensured.

  According to a fourth aspect of the present invention, there is provided an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, and an inner side of the double row facing the outer rolling surface of the double row on an outer periphery. An inner member in which a rolling surface is formed, a double row rolling element that is accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member A seal composed of an annular seal plate and a slinger mounted on an opening of an annular space formed between the member and the inner member, and arranged opposite to each other, the seal plate of the outer member A cylindrical fitting portion press-fitted into the inner periphery of the end portion, a cored bar formed of an inner diameter portion extending radially inward from the fitting unit, and a seal member integrally joined to the cored bar by vulcanization bonding A cylindrical portion in which the slinger is press-fitted into the outer diameter of the inner member, and radially outward from the cylindrical portion. The seal member has a side lip that extends in a radially outward direction and is in sliding contact with the standing plate portion of the slinger. In a method of assembling a wheel bearing device in which a labyrinth seal is configured by a plate portion facing the seal plate via a slight radial clearance, a deformation state at the time of press-fitting the core metal is verified in advance, and the deformation is performed. Assuming that the inner diameter portion of the metal core is formed to be obtuse by a predetermined inclination angle rather than a right angle with respect to the fitting portion of the metal core, the seal plate and the slinger are previously unitized. The step of placing in the openings of the outer member and the inner member, and the end surface of the seal plate and the side surface of the slinger are pressed by a press-fitting jig and pressed into the outer member and the inner member. Process.

  As described above, the seal plate is provided with an annular seal plate and a slinger that are attached to the opening of the annular space formed between the outer member and the inner member and arranged to face each other. A metal core comprising a cylindrical fitting portion press-fitted into the inner periphery of the end of the outer member, and an inner diameter portion extending radially inward from the fitting portion, and the metal core are integrally joined by vulcanization adhesion The slinger is formed in a substantially L-shaped cross section including a cylindrical portion press-fitted into the outer diameter of the inner member and a standing plate portion extending radially outward from the cylindrical portion. The member has a side lip that extends obliquely outward in the radial direction and is slidably contacted with the standing plate portion of the slinger, and the standing plate portion is opposed to the seal plate through a slight radial clearance to form a labyrinth seal. In the method of assembling a wheel bearing device constructed as described above, The deformation state at the time is verified in advance, and assuming the deformation, the inner diameter part of the cored bar is formed to be obtuse by a predetermined inclination angle rather than a right angle with respect to the fitting part of the cored bar, The seal plate and the slinger are unitized in advance and placed in the openings of the outer member and the inner member, and the end surface of the seal plate and the side surface of the slinger are pressed by the press-fitting jig, The inner diameter portion of the metal core is in a free state and the angle between the fitting portion and the inner diameter portion is substantially equal even if the inner diameter portion of the core metal is deformed due to the influence of the press-fitting of the fitting portion. It becomes a right angle, and the side lip and slinger can be set as designed.

  Preferably, as in the invention described in claim 5, if the seal member includes a grease lip that is slidably contacted with the cylindrical portion of the slinger via a predetermined shimoshiro, the seal plate and the slinger are a unit. Even if it is made, it is not separated and workability can be improved.

  Further, as in the invention described in claim 6, if the end surface of the seal plate and the side surface of the standing plate portion of the slinger are set to be flush with each other, it is not necessary to provide a step in the press-fitting jig, and a simple shape In addition, the sealing plate and the slinger can be press-fitted with high accuracy and stability.

  The seal of 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 the inner periphery, and an inner side of the double row facing the outer surface of the double row on the outer periphery. An inner member in which a rolling surface is formed, a double row rolling element that is accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member A seal composed of an annular seal plate and a slinger mounted in an opening of an annular space formed between the member and the inner member, and arranged opposite to each other, the seal plate of the outer member A cylindrical fitting portion press-fitted into the inner periphery of the end portion, a cored bar formed of an inner diameter portion extending radially inward from the fitting unit, and a seal member integrally joined to the cored bar by vulcanization bonding A cylindrical portion in which the slinger is press-fitted into the outer diameter of the inner member, and a radial direction from the cylindrical portion. It is formed in a substantially L-shaped cross section consisting of a standing plate portion extending outward, and the seal member has a side lip that extends in a radially outward direction and slidably contacts the standing plate portion of the slinger, In the seal of the wheel bearing device in which the standing plate portion is opposed to the seal plate through a slight radial clearance to form a labyrinth seal, the deformation state at the time of press-fitting the core metal is verified in advance, and the deformation Since the inner diameter portion of the metal core is formed to be obtuse by a predetermined inclination angle rather than a right angle with respect to the fitting portion of the metal core, the fitting portion is Even if the inner diameter part is deformed in the direction of the slinger due to the compression, the side lip shimoshiro can be set as designed, and the seal seal and durability are improved to extend the life of the bearing. A wheel bearing device can be provided.

  The wheel bearing device assembly method according to the present invention includes an outer member having a double row outer rolling surface integrally formed on an inner periphery, and a multi-piece facing the outer rolling surface of the double row on an outer periphery. An inner member in which an inner rolling surface of the row is formed, and a double row rolling element that is accommodated so as to roll freely between both rolling surfaces of the inner member and the outer member, A seal composed of an annular seal plate and a slinger, which are attached to an opening of an annular space formed between the outer member and the inner member and are arranged opposite to each other, and the seal plate is A cylindrical metal fitting that is press-fitted into the inner periphery of the end of the side member, and a metal core that has an inner diameter that extends radially inward from the fitting part, and the metal core is integrally joined by vulcanization adhesion And a cylindrical portion in which the slinger is press-fitted into the outer diameter of the inner member, and the cylindrical portion. A side lip that is formed in a substantially L-shaped cross section comprising a standing plate portion extending radially outward from the seal member, and that is inclined in the radial direction and extends in sliding contact with the standing plate portion of the slinger. In a method for assembling a wheel bearing device in which a labyrinth seal is configured by the vertical plate portion facing the seal plate through a slight radial clearance, the deformation state at the time of press-fitting the core metal is verified in advance Assuming the deformation, the inner diameter portion of the cored bar is formed to have an obtuse angle by a predetermined inclination angle rather than a right angle with respect to the fitting part of the cored bar, and the seal plate and the slinger Is pre-unitized and placed in the openings of the outer member and the inner member, and the end surface of the seal plate and the side surface of the slinger are pressed by a press-fitting jig, and the outer member and the inner member are The core is press-fitted into the member. Even if the inner diameter part of the fitting becomes free and deforms due to the influence of the press-fitting of the fitting part, the angle between the fitting part and the inner diameter part becomes almost right, and the side lip and slinger are set as designed. can do.

  An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for attaching a wheel to one end And a hub wheel in which one inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub An inner member formed of an inner ring press-fitted into a small-diameter step portion of the ring and having the other inner rolling surface opposed to the outer rolling surface of the double row on the outer periphery; and the inner member and the outer member Mounted in a double row rolling element accommodated between the rolling surfaces via a cage, and an opening in an annular space formed between the outer member and the inner ring, facing each other. An annular sealing plate and a seal made of a slinger. A cylindrical metal fitting that is press-fitted into the inner periphery of the end of the member, and a metal core that has an inner diameter that extends radially inward from the fitting part, and a seal that is integrally joined to the metal core by vulcanization bonding And the slinger is formed in a substantially L-shaped cross section including a cylindrical portion press-fitted into the outer diameter of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion. However, the labyrinth has a side lip that extends radially incliningly and is slidably contacted with the standing plate portion of the slinger, and the standing plate portion is opposed to the seal plate through a slight radial clearance. In the seal of the wheel bearing device in which the seal is configured, the end portion of the fitting portion of the core metal is reduced in diameter, and the seal member is joined from the outer periphery to the inner diameter portion so as to cover the end portion. In addition, the deformation state when the core metal is press-fitted is verified in advance. Is, the inner diameter portion of the core metal assumes its deformation is formed such that an obtuse angle by a predetermined angle of inclination than a right angle with respect to the fitting portion of the metal core.

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 one seal part of FIG. 1, and FIG. 3 is a single seal of FIG. FIG. 4A and FIG. 4B are explanatory views showing a seal assembling method. 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 referred to as a third generation for driving wheels and is externally inserted through an inner member 3 composed of a hub wheel 1 and an inner ring 2 through double rows of balls 4, 4. The outer joint member 11 of the constant velocity universal joint 10 is coupled to the hub wheel 1 so as to transmit torque and to be separable.

  The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 1a on the outer periphery, and this inner rolling. A cylindrical small diameter step portion 1b extending in the axial direction from the surface 1a is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. Further, hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. The inner ring 2 is formed with the other (inner side) inner rolling surface 2a on the outer periphery, and is press-fitted and fixed to the small-diameter step portion 1b of the hub ring 1 through a predetermined shimiro.

  The hub wheel 1 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 that becomes a seal land portion of a seal 8 to be described later. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base 6b to the small diameter step 1b. On the other hand, the inner ring 2 and the ball 4 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 5 integrally has a vehicle body mounting flange 5b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 1a and 2a of the inner member 3 on the inner periphery. Opposing double-row outer rolling surfaces 5a and 5a are integrally formed. Between these rolling surfaces 5a, 1a and 5a, 2a, double-row balls 4, 4 are accommodated via a cage 7 so as to roll freely. This outer member 5 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 rolling surfaces 5a and 5a are surfaced in the range of 58 to 64HRC by induction hardening. Has been cured.

  Further, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of the lubricating grease sealed inside the bearing to the outside and from the outside It prevents rainwater and dust from entering the bearing.

  The outer joint member 11 integrally has a shaft portion 13 extending in the axial direction from the shoulder portion 12. A serration 13a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 13, and a male screw is formed at the end of the serration 13a. Then, the shaft portion 13 of the outer joint member 11 is fitted into the hub wheel 1 through the serrations 1c and 13a until the shoulder portion 12 abuts the end surface of the inner ring 2, and the hub wheel is fixed by the fixing nut 14 fastened to the male screw. 1 and the outer joint member 11 are unitized so that torque can be transmitted and detachable.

  The seal 8 on the outer side of the seals 8 and 9 is constituted by an integrated seal including a metal core 15 and a seal member 16 joined to the metal core 15. The core metal 15 is formed by pressing a cold-rolled steel plate (JIS standard SPCC system or the like).

  On the other hand, the seal member 16 is made of synthetic rubber such as nitrile rubber and is integrally joined to the core metal 15 by vulcanization adhesion. The seal member 16 has a pair of side lips 16a and 16b formed to be inclined outward in the radial direction, and a grease lip 16c formed to be inclined inward of the bearing. A base 6b on the inner side of the wheel mounting flange 6 is formed in a curved surface having a circular cross section, and a side lip 16b and a grease lip 16c are slidably contacted with the base 6b with a predetermined squeeze.

  Further, as shown in an enlarged view in FIG. 2, the inner seal 9 is constituted by a so-called pack seal including an annular seal plate 17 and a slinger 18 which are arranged to face each other. The seal plate 17 includes a cored bar 19 attached to the outer member 5 and a seal member 20 integrally joined to the cored bar 19 by vulcanization adhesion. The core 19 is formed by pressing from a steel plate having rust prevention ability such as an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). A cylindrical fitting portion 19a that is formed in a substantially L-shaped cross section and is press-fitted into the inner periphery of the end portion of the outer member 5 via a predetermined shimiro, and an inner diameter portion that extends radially inward from the fitting portion 19a 19b.

  On the other hand, the seal member 20 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and includes a side lip 20a extending obliquely outward in the radial direction, a grease lip 20b and an intermediate lip 20c formed in a bifurcated shape. Have. Here, the end of the fitting portion 19a of the cored bar 19 is reduced in diameter, and the seal member 20 is joined from the outer periphery to the inner diameter portion 19b so as to cover the end. Thereby, the fitting surface of the outer member 5 and the cored bar 19 can be sealed by the sealing member 20, and rainwater, dust, etc. can be prevented from entering the inside of the bearing from the fitting surface. In addition to NBR, the material of the seal member 20 is excellent in heat resistance and chemical resistance, such as HNBR (hydrogenated acrylonitrile-butadiene rubber) and EPDM (ethylene propylene rubber), which have excellent heat resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluorine rubber), EPM (ethylene / propylene rubber), and silicon rubber.

  On the other hand, the slinger 18 has a substantially L-shaped cross section, and includes a cylindrical portion 18a that is press-fitted into the outer diameter of the inner ring 2, and a standing plate portion 18b that extends radially outward from the cylindrical portion 18a. The side lip 20a of the seal member 20 is in sliding contact with the upright plate portion 18b, and the intermediate lip 20c is in sliding contact with the cylindrical portion 18a. Further, the grease lip 20b is opposed to the cylindrical portion 18a via a predetermined radial clearance to constitute a labyrinth seal. Further, the standing plate portion 18 b of the slinger 18 is opposed to the seal plate 17 through a slight radial clearance to form a labyrinth seal 21.

  Further, a magnetic encoder 22 in which a magnetic substance powder such as ferrite is mixed in an elastomer such as rubber is integrally joined to the inner side surface of the standing plate portion 18b by vulcanization adhesion or the like. This magnetic encoder 22 is magnetized with magnetic poles N and S alternately in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel.

  Slinger 18 is formed by pressing a ferromagnetic steel plate, such as a ferritic stainless steel plate (JIS standard SUS430, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). Is formed. As a result, even if the slinger 18 is exposed to rain water, muddy water or the like, or even if rain water or muddy water enters the fitting portion with the inner ring 2, the slinger 18 can be prevented from rusting, The output signal of the magnetic encoder 22 becomes stronger, and stable detection accuracy can be ensured.

  Here, in this embodiment, as shown in FIG. 3, the cored bar 19 of the seal plate 17 is formed in a state of being deformed in advance, assuming that it is deformed when press-fitted into the outer member 5. That is, the inner diameter portion 19b of the cored bar 19 is formed so as to be obtuse with respect to the fitting portion 19a by an inclination angle α rather than a right angle. Here, the inclination angle α is set in the range of 3 to 10 °. As a result, the fitting portion 19a is compressed when the metal core 19 is press-fitted, and even if the inner diameter portion 19b is deformed to the inner side (in the direction of the slinger 18), the side lip 20a and the grease lip 20b are in the radial direction. The clearance can be set as designed, and the contact state of the intermediate lip 20c can be prevented from changing. Therefore, it is possible to provide a wheel bearing device in which the seal 9 is improved in sealability and durability and the bearing life is extended.

Here, the assembly method of the inner side seal 9 will be described in detail with reference to FIG.
As shown in (a), the seal plate 17 and the slinger 18 are previously unitized and placed in an opening of an annular space formed between the outer member 5 and the inner ring 2. At this time, since the intermediate lip 20c and the cylindrical portion 18a of the slinger 18 have a scissors, the seal plate 17 and the slinger 18 are not separated, and workability can be improved. Next, as shown in (b), the end surface of the seal plate 17 and the side surface of the magnetic encoder 22 of the slinger 18 are pressed by the press-fitting jig 23, and the seal plate 17 and the slinger 18 are brought into contact with the outer member 5 and the inner ring 2. Press in. In the present embodiment, the end surface of the seal plate 17 and the side surface of the magnetic encoder 22 of the slinger 18 are set to be flush with each other, that is, the same plane. Thereby, it is not necessary to provide a step in the press-fitting jig 23 and a simple shape can be obtained, and the seal plate 17 and the slinger 18 can be press-fitted with high accuracy and stability.

  In the press-fitting process of this type of seal 9, the slinger 18 can press-fit the entire side surface of the magnetic encoder 22 with the press-fitting jig 23 while restraining deformation of the slinger 18. Since the end face is pressed, the inner diameter part 19b of the cored bar 19 is in a free state and is deformed under the influence of the press-fitting of the fitting part 19a. Therefore, as in the present embodiment, the deformation state of the cored bar 19 at the time of press-fitting is verified in advance, and the inner diameter portion 19b of the cored bar 19 is deformed assuming that the seal 9 is in a single state. As a result, the inner diameter portion 19b is deformed at the time of press-fitting so that the angle between the fitting portion 19a and the inner diameter portion 19b becomes substantially a right angle, and the nip and clearance between each lip and the slinger 18 can be set as designed.

  Here, since the seal 9 in which the magnetic encoder 22 is joined to the side surface of the standing plate portion 18b of the slinger 18 is illustrated, the side surface of the magnetic encoder 22 and the end surface of the seal plate 17 are set to be flush with each other. However, the present invention is not limited to this, and in a slinger to which the magnetic encoder 22 is not joined, the side surface of the standing plate portion 18b and the end surface of the seal plate 17 are set to be flush with each other. By press-fitting both, the nip and clearance between each lip and the slinger 18 can be set as designed.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device according to the present invention can be applied to a wheel bearing device having a first generation to a fourth generation structure in which a pack seal is attached to an opening of an annular space.

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 one seal part of FIG. FIG. 3 is an enlarged view showing a single seal of FIG. 2. (A), (b) is explanatory drawing which shows the assembly method of a seal | sticker. (A) is a half sectional view of a conventional seal. (B) is an enlarged view which shows the B section of (a). (A) is explanatory drawing which shows the press injection method of a seal | sticker. (B) is a schematic diagram which shows the state after press-fitting same as the above.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・.... Small diameter step 1c, 13a ... Serration 2 ... Inner ring 3 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 5a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 7 ・ ・ ・ ・ ・ ・··························································· Outer seal 9・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 10 on the inner side ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside Joint member 12 ... shoulder 13 ... shaft 14 ...・ ・ ・ ・ Fixing nuts 15 and 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cores 16 and 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal members 16a, 16b and 20a・ Side lips 16c, 20b ・ ・ ・ ・ ・ ・ Grease lip 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 18 ・ ・ ・ ・ ・ ・ ・ ・· · Slinger 18a · · · · · · · cylindrical portion 18b · · · · · · · · Standing plate portion 19 ···・ ・ ・ ・ Core 19a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting 19b ..... Inner diameter part 20c ..... Intermediate lip 21 ... Labyrinth seal 22 ... Magnetic encoder 23 ... Press-fit jig 50 ... ······························································ Housing 51a ······························・ ・ ・ ・ ・ ・ Rotary shaft 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sleeve member 53a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Flange portion 53b ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Sleeve 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Metal ring 54a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder 54b ・ ・ ・ ・............ annular part 54c ...・ ...... Recess 55 ・ ・ ・ ・ ・ ・ Elastic member 55a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Main lip 55b ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ Dustrip 55c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Edge seal part A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Air side O・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sealed fluid side α ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inclination angle

Claims (6)

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;
A seal composed of an annular seal plate and a slinger attached to an opening of an annular space formed between the outer member and the inner member, and arranged opposite to each other;
The seal plate includes a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member, a cored bar that extends radially inward from the fitting unit, and vulcanizes the cored bar. It consists of a seal member joined together by bonding,
The slinger is formed in a substantially L-shaped cross section consisting of a cylindrical portion that is press-fitted into the outer diameter of the inner member, and a standing plate portion that extends radially outward from the cylindrical portion, and the sealing member is A labyrinth seal is configured by having a side lip that extends outwardly and is slidably contacted with the standing plate portion of the slinger, and the standing plate portion is opposed to the seal plate through a slight radial clearance. In the seal of a bearing device for a wheel,
The deformation state at the time of press-fitting of the metal core is verified in advance, and assuming the deformation, the inner diameter portion of the metal core becomes an obtuse angle by a predetermined inclination angle rather than a right angle with respect to the fitting portion of the metal core. A seal for a wheel bearing device, characterized in that the seal is formed.   2. The wheel bearing device according to claim 1, wherein an end portion of the fitting portion of the core metal is reduced in diameter, and the seal member is joined from the outer periphery to the inner diameter portion so as to cover the end portion. sticker.   The seal of the wheel bearing device according to claim 1 or 2, wherein the slinger is formed by press working from a ferromagnetic steel plate having antirust performance. 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;
A seal composed of an annular seal plate and a slinger attached to an opening of an annular space formed between the outer member and the inner member, and arranged opposite to each other;
The seal plate includes a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member, a cored bar that extends radially inward from the fitting unit, and vulcanizes the cored bar. It consists of a seal member joined together by bonding,
The slinger is formed in a substantially L-shaped cross section including a cylindrical portion that is press-fitted into the outer diameter of the inner member, and a standing plate portion that extends radially outward from the cylindrical portion. A labyrinth seal is configured by having a side lip that extends outwardly and is slidably contacted with the standing plate portion of the slinger, and the standing plate portion is opposed to the seal plate through a slight radial clearance. In a method for assembling a wheel bearing device,
The deformation state at the time of press-fitting of the metal core is verified in advance, and assuming the deformation, the inner diameter portion of the metal core becomes an obtuse angle by a predetermined inclination angle rather than a right angle with respect to the fitting portion of the metal core. The sealing plate and the slinger are previously unitized and placed in the openings of the outer member and the inner member, and the end surface of the sealing plate and the side surface of the slinger are press-fit. A method of assembling a wheel bearing device, comprising: a step of being pressed by a tool and being press-fitted into the outer member and the inner member.   The wheel bearing apparatus assembly method according to claim 4, wherein the seal member includes a grease lip that is slidably contacted with the cylindrical portion of the slinger via a predetermined shimoshiro.   The wheel bearing device assembly method according to claim 4 or 5, wherein an end surface of the seal plate and a side surface of the standing plate portion of the slinger are set to be flush with each other.

Images