JP2007224941A - Bearing unit for wheel and seal press-in method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit for a wheel and a seal press-in method thereof capable of suitably fitting and attaching a seal to an end inner peripheral surface of an outward member. <P>SOLUTION: The bearing unit for the wheel is provided with the outward member 10 having double row outside rolling faces 10a on an inner periphery, an inward member 1 having double row inside rolling faces 2a and 3a on an outer periphery, double row rolling bodies 7 housed between the rolling faces of the inward member 1 and the outward member 10 so as to be freely rolled, and the seal 8 integrally equipped with a plurality of side lips 12a and 12b. The seal 8 comprises a core metal 11 fitted into the outward member 10, and a seal member 12 integrally vulcanized and bonded to the core metal 11, and a cover part 12d extending to an outside diameter direction from a base part of the side lip 12a on the outermost side of the side lip is provided for covering the core metal 11, and an outside diameter B of the cover part 12d is set to be larger than an outside diameter A of the side lip 12a on the outermost side. <P>COPYRIGHT: (C)2007,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, and more specifically, for a wheel that can be fitted and fitted with a seal well on an inner peripheral surface of an end portion of an outer member. The present invention relates to a 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. For example, as disclosed in Patent Document 1, a conventional wheel bearing device equipped with such a seal includes an outer member having a double row outer rolling surface formed on the inner periphery, and a wheel at one end. A hub wheel integrally having a wheel mounting flange for mounting a wheel and having a small-diameter step portion extending in the axial direction from the wheel mounting flange on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member having a double-row inner rolling surface opposite the double-row outer rolling surface on the outer periphery, and a cage between the inner and outer members. And a double row rolling element housed so as to be freely rollable, and a seal that is attached to the end of the outer member and integrally includes a plurality of side lips that are in sliding contact with the hub wheel.

However, in the manufacturing process of the wheel bearing device, in order to attach the seal to the outer member, generally, the jig of the press-fitting device is placed between the outer diameter of the outermost side lip and the outer diameter of the cored bar. And a step of applying a load while abutting. If the inner member is assembled to the outer member having the seal attached to the end in this way, the plurality of side lips and grease lips are brought into sliding contact with the hub wheel, and the seal is made.
JP 2004-60751 A

  However, in the wheel bearing device as described above, in order to attach the seal to the end portion of the outer member, the press-fitting device is set between the outer diameter of the outermost side lip and the outer diameter of the metal core. Although it is necessary to apply a load while abutting the tool, there is a concern that the jig directly abuts against the core metal, and scratches or the like may be imparted to the core metal. Further, when the jig is in contact, the jig of the press-fitting device may interfere with the outermost side lip of the side lips and may be damaged.

  The present invention has been made in view of such a conventional problem, and provides a wheel bearing device and a seal press-fitting method thereof that can be fitted and fitted with a seal to an inner peripheral surface of an end of an outer member. For the purpose.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting a wheel at one end. And a hub ring having a small-diameter step portion extending in the axial direction from the wheel mounting flange on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring. An inner member in which a double row inner rolling surface facing the outer rolling surface of the row is formed, and the inner member and the outer member can be freely rolled via a cage between both rolling surfaces. In the wheel bearing device comprising: a accommodated double row rolling element; and a seal that is attached to an end of the outer member and integrally includes a plurality of side lips that are in sliding contact with the hub wheel, the seal includes: A cored bar fitted into the outer member, and vulcanized and bonded integrally to the cored bar A plurality of side lips formed on the seal member, and a cover portion extending from the base of the outermost side lip of the side lips in the outer diameter direction to cover the cored bar. In addition, the outer diameter of the covering portion is set larger than the outer diameter of the outermost side lip.

  As described above, in the wheel bearing device including the seal integrally including the side lip that is slidably contacted with the hub wheel, the seal extends in the outer diameter direction from the base portion of the outermost side lip of the side lips and is cored. Since the outer diameter of the cover portion is set larger than the outer diameter of the outermost side lip, the outer diameter of the outermost side lip and the outer cover of the outermost side lip are set. The jig of the press-fitting device can be brought into contact with the cover between the outer diameter and the side lip while avoiding interference, and the seal is fitted and fitted to the inner peripheral surface of the end of the outer member. It is possible to provide a wheel bearing device that can be used.

  According to a second aspect of the present invention, the metal core includes a fitting portion that is fitted to the inner peripheral surface of the end portion of the outer member, and an inner portion that extends radially inward from the fitting portion. If the inclined portion is formed between the inner portion and the fitting portion, and the cover portion covers the inclined portion, the press-fitting device covers the jig in the load application direction. The thickness of the portion can be increased, and the seal can be fitted and attached more favorably to the inner peripheral surface of the end portion of the outer member.

  According to a third aspect of the present invention, the seal member includes a radial lip that extends radially inward from a base portion of the innermost side lip among the plurality of side lips and is in sliding contact with the hub wheel or the inner ring. Is formed. Further, as in the invention described in claim 4, if the cored bar is formed by pressing from a steel plate having corrosion resistance, the durability of the seal can be improved.

  Furthermore, the invention according to claim 5 integrally includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange for attaching the wheel to one end. A hub wheel formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, and opposed to the outer surface of the double row on the outer periphery. An inner member in which a double row inner rolling surface is formed, and a double row rolling element that is rotatably accommodated between both the inner member and the outer member via a cage. And a seal that is attached to an end of the outer member and integrally includes a plurality of side lips that are in sliding contact with the hub wheel, and the seal is inserted into the outer member; A seal member integrally vulcanized and bonded to the core metal, and the plurality of supports are attached to the seal member. A drip is formed, and has a cover portion that extends in the outer diameter direction from the base portion of the outermost side lip of the side lip and covers the cored bar, and more than the outer diameter of the outermost side lip. A seal press-fitting method for a wheel bearing device in which the outer diameter of the cover portion is set larger, and a jig of the press-fitting device is brought into contact with a portion between the outer diameter of the side lip and the outer diameter of the cover portion. The seal is fitted to the inner peripheral surface of the end portion of the outer member by applying a load while causing it to occur.

  The wheel bearing device according to the present invention integrally has an outer member having a double row outer raceway formed on the inner periphery and a wheel mounting flange for mounting the wheel on one end, and the wheel on the outer periphery. A hub ring formed with a small-diameter step extending in the axial direction from the mounting flange, and at least one inner ring press-fitted into the small-diameter step of the hub ring. 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 wheel bearing device including a seal that is mounted on an end portion of the outer member and integrally includes a plurality of side lips that are in sliding contact with the hub wheel, and the seal is a core that is fitted into the outer member. And a seal member integrally vulcanized and bonded to the metal core. A plurality of side lips formed on the member, and a covering portion extending from the base of the outermost side lip of the side lip to the outer diameter direction to cover the core metal, and the outermost side lip Since the outer diameter of the cover portion is set larger than the outer diameter of the lip, the jig of the press-fitting device with respect to the cover portion between the outer diameter of the outermost side lip and the outer diameter of the cover portion Can be brought into contact with each other, and a wheel bearing device can be provided in which the seal can be satisfactorily fitted and attached to the inner peripheral surface of the end portion of the outer member.

  An outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange for attaching a wheel to one end of the outer member, and a small-diameter step portion extending axially from the wheel mounting flange on the outer periphery. And at least one inner ring press-fitted into a small-diameter step portion of the hub ring, and a double row inner rolling surface facing the double row outer rolling surface is formed on the outer periphery. An inner member, a double-row rolling element housed between the rolling surfaces of the inner member and the outer member via a cage, are mounted on the end of the outer member. In the wheel bearing device comprising a seal integrally having a plurality of side lips that are in sliding contact with the hub wheel, the seal is integrated with the core metal fitted into the outer member and the core metal. A plurality of side lips formed on the sealing member. A cover portion that is formed and extends in the outer diameter direction from the base portion of the outermost side lip of the side lip to cover the cored bar, and the cover portion is formed from the outer diameter of the outermost side lip. The outer diameter of is set larger.

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 of FIG. 1, and FIG. 3 is an enlarged main part showing a relationship between outer diameter dimensions of FIG. FIG. 4 and FIG. 4 are schematic views showing a seal press-fitting process by a press-fitting device. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device is for a driven 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 configuration is called the third generation. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors.

  The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel at one end portion, and has one (outer side) inner rolling surface 2a on the outer periphery and a small diameter extending in the axial direction from the inner rolling surface 2a. A step 2b is formed. Further, hub bolts 4 a are implanted at circumferentially equidistant positions of the wheel mounting flange 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 end portion of the small-diameter step portion 2b is fixed in the axial direction with respect to the hub wheel 2 in a state in which a preload is applied by a caulking portion 5 formed by plastic deformation radially outward.

  The hub wheel 2 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and extends from the base of the wheel mounting flange 4 serving as a seal land portion of the seal 8 to be described later to the small diameter step portion 2b. The surface is hardened in the range of 58 to 64 HRC by induction hardening. The caulking portion 5 is left as it is after forging. On the other hand, the inner ring 3 is formed of a high carbon chrome steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core 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 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. The outer member 10 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and at least double row outer rolling surfaces 10a and 10a are surfaced in a range of 58 to 64 HRC by induction hardening. Has been cured.

  Seals 8 and 9 are attached to both ends of the outer member 10 to seal an opening of an 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 prevent rainwater and dust from entering the bearing from the outside.

  The seal 9 on the inner side of the seals 8 and 9 includes a slinger 15 and an annular seal member 16. Slinger 15 is made of austenitic stainless steel plate (JIS standard SUS304 series, etc.) or rust-proof cold rolled steel plate (JIS standard SPCC series, etc.), and the cross section is substantially L-shaped. A cylindrical portion 15a formed and press-fitted into the inner ring 3 and a standing plate portion 15b extending radially outward from the cylindrical portion 15a. On the other hand, the seal member 16 is attached to the outer member 10 so as to face the slinger 15 and is formed in a substantially L-shaped cross section, and a metal core 16a fitted into an end portion of the outer member 10, It consists of a sealing member 16b vulcanized and bonded to the metal core 16a. The metal core 16a 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). On the other hand, the seal member 16b is made of an elastic member such as rubber and has a side lip and a radial lip that are in sliding contact with the slinger 15.

  As shown in an enlarged view in FIG. 2, the outer seal 8 includes a core metal 11 fitted into the outer member 10 and a seal member 12 integrally bonded to the core metal 11 by vulcanization. The metal core 11 is formed by pressing a corrosion-resistant steel plate, such as an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). And a cylindrical fitting portion 11a fitted into the inner periphery of the end portion of the outer member 10, and an inner portion 11b formed by bending from the fitting portion 11a and extending radially inward. .

  On the other hand, the seal member 12 is made of synthetic rubber such as nitrile rubber and is fixed over a predetermined range of the core metal 11. The seal member 12 has a pair of side lips 12a and 12b and a radial lip 12c extending radially inward from the base of the inner side lip 12b. The side lips 12a and 12b are formed with different lengths and inclined outward, and are in sliding contact with the base of the wheel mounting flange 4 with a predetermined squeeze. This base is formed in a curved surface having a circular arc cross section. The radial lip 12c is formed so as to be inclined toward the inner side of the bearing, and is in sliding contact with the outer peripheral surface of the base portion with a predetermined squeeze to prevent the grease enclosed in the bearing from flowing out.

  Further, in the present embodiment, an inclined portion 11c is formed between the inner portion 11b and the fitting portion 11a (a boundary portion between the inner portion 11b and the fitting portion 11a), and the side lip A cover portion 12 d that extends in the outer diameter direction from the base portion (root) of the outermost side lip 12 a and covers the cored bar 11 is formed. That is, the cover portion 12d is in a state of covering the inclined portion 11c as shown in the drawing.

  Here, in the present embodiment, as shown in FIG. 3, the outer diameter B of the cover portion 12d is set larger than the outer diameter A of the outermost side lip 12a. The press-fitting process by the jig 14 of the press-fitting device 13 is good between the outer diameter of 12a and the outer diameter of the cover portion 12d. The press-fitting device 13 is, for example, for press-fitting the seal 8 to the end portion of the outer member 10 and mounting it, and has a jig 14 as shown in FIG. The jig 14 has a substantially annular contact surface 14a at the lower end, and the contact surface 14a is the above-described cover 12d (the outer diameter A of the side lip 12a and the outer diameter B of the cover 12d. (Between).

However, the press-fitting process of the seal 8 will be specifically described below with reference to FIG.
First, the outer member 10 is placed on the placement surface F with the press-fit end face facing upward. Then, the seal 8 is set on the inner peripheral surface of the end portion of the outer member 10, and the outer diameter A of the side lip 12a in the covering portion 12d and the outside of the covering portion 12d are covered with the contact surface 14a in the jig 14 of the press-fitting device 13. It is made to contact between diameter B.

  In this state, the press-fitting device 13 is driven to lower the jig 14, thereby applying a downward load to the portion where the abutting surface 14 a abuts, and the entire seal 8 together with the core metal 11 to the outer member 10. It is made to fit inside the end. At this time, since the outer diameter B of the cover portion 12d is set larger than the outer diameter A of the outermost side lip 12a, the side lip 12a (of course, the inner side lip 12b is also included) with respect to the cover portion 12d. A wheel bearing device that can contact the jig 14 of the press-fitting device 13 while avoiding interference with the outer member 10 and can fit the seal 8 to the inner peripheral surface of the end portion 10 of the outer member 10. Can be provided.

  The core metal 11 includes a fitting portion 11a fitted to the inner peripheral surface of the end portion of the outer member 10, and an inner portion 11b extending radially inward from the fitting portion 11a. Since the inclined portion 11c is formed between the fitting portion 11a and the cover portion 12d covers the inclined portion 11c, the cover portion 12d with respect to the load application direction of the jig 14 of the press-fitting device 13 is used. , And the seal 8 can be fitted and attached more favorably to the inner circumferential surface of the end portion of the outer member 10.

  Here, a double-row angular contact ball bearing using balls as the rolling elements 7 is illustrated, but the present invention is not limited to this, and a double-row tapered roller bearing using tapered rollers as the rolling elements 7 may be used. . Further, the wheel bearing device according to the present invention can be applied to, for example, a first generation, a second generation, or a fourth generation structure in addition to the illustrated third generation structure as long as it is an inner ring rotating system. .

  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 first to fourth generation wheel bearing devices of an inner ring rotating system.

It is a longitudinal section showing an embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows the outer diameter dimension relationship of FIG. It is a schematic diagram which shows the press injection process of the seal | sticker by a press injection apparatus.

Explanation of symbols

1 .... inner member 2 .... hub wheels 2a, 3a ... inward rolling surface 2b ...・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 4a ・ ・ ・ ・ ・ ・ ・ ・... Hub bolt 5 ..... Clamping part 6 ..... Cage 7 ..... Rolling element 8 ······ Outer side seal 9 ·············· Inner side seal 10 ············ Outer member 10a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 11a ・ ・ ・ ・ ・ ・... Fitting part 11b ... Inner part 11c ... Inclined part 2 ... Seal member 12a ... Outer side lip 12b ... Inner side lip 12c ... ··· Radial lip 12d ··· Cover portion 13 ········· Press-fit device 14 ········· Jig 14a ·································· Slinger 15a ························· Plate portion 16 ... Seal member 16a ... Metal core 16b ... Seal member

Claims (5)

An outer member having a double row outer raceway formed on the inner periphery;
A hub wheel having a wheel mounting flange for mounting a wheel on one end and an outer periphery formed with a small-diameter stepped portion extending in the axial direction from the wheel-mounting flange, and press-fitted into the small-diameter stepped portion of the hub wheel An inner member formed of at least one inner ring, and formed with a double-row inner rolling surface opposed to the double-row outer rolling surface 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 that is attached to an end of the outer member and integrally has a plurality of side lips that are in sliding contact with the hub wheel;
In a wheel bearing device comprising:
The seal includes a core metal fitted into the outer member, and a seal member integrally vulcanized and bonded to the core metal, and the plurality of side lips are formed on the seal member. The side lip has a cover portion that extends in the outer diameter direction from the base portion of the outermost side lip to cover the cored bar, and the outer diameter of the cover portion is larger than the outer diameter of the outermost side lip. A wheel bearing device characterized by being set large.   The cored bar is composed of a circumferential portion fitted to the inner circumferential surface of the end portion of the outer member, and a standing plate portion extending radially inward from the circumferential portion, and the standing plate portion and the circumferential portion. 2. The wheel bearing device according to claim 1, wherein an inclined portion is formed between the first and second cover portions, and the cover portion covers the inclined portion.   The radial lip that extends radially inward from a base portion of the innermost side lip among the plurality of side lips and is in sliding contact with the hub wheel or the inner ring is formed on the seal member. The wheel bearing device according to claim 1 or 2.   The wheel bearing device according to any one of claims 1 to 3, wherein the core metal is formed by press working from a steel plate having corrosion resistance. An outer member having a double row outer raceway formed on the inner periphery;
A hub wheel having a wheel mounting flange for mounting a wheel on one end and an outer periphery formed with a small-diameter stepped portion extending in the axial direction from the wheel-mounting flange, and press-fitted into the small-diameter stepped portion of the hub wheel An inner member formed of at least one inner ring, and formed with a double-row inner rolling surface opposed to the double-row outer rolling surface 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 that is attached to an end of the outer member and integrally has a plurality of side lips that are in sliding contact with the hub wheel;
And the seal is comprised of a core metal fitted into the outer member and a seal member integrally vulcanized and bonded to the core metal, and the plurality of side lips are formed on the seal member And a cover portion that extends in the outer diameter direction from the base portion of the outermost side lip of the side lip and covers the core metal, and the outer diameter of the cover portion is larger than the outer diameter of the outermost side lip. Is a method for press-fitting a seal of a wheel bearing device, which is set larger.
The seal is fitted to the inner peripheral surface of the end portion of the outer member by applying a load while bringing the jig of the press-fitting device into contact with the outer diameter of the side lip and the outer diameter of the cover portion. A seal press-fitting method for a wheel bearing device.

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