JP2004239423A - Sealing structure of bearing part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a streamlined cost-effective sealing structure while having a combined seal ring excellent in sealing performance by improving the structure of a bearing part having a tone wheel and a seal ring. <P>SOLUTION: This sealing structure comprises the combined seal ring 12 formed by distributing a first annular core S1 and a second annular core S2 having a seal member 20 with lips 20a to 20c in slidable contact with the first annular core S1 into a fixed member 2 and rotating member 1 and supporting these members. A ring tone wheel 21 is installed on the rotating member 1. The tone wheel 21 is installed on the annular support member 17 fitted to the rotating member 1. The opposite side of the support member 17 on the side where the tone wheel 21 is installed is extended, and the extension part 17c is formed in the first core S1 or the second core S2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure of a bearing portion applied to a bearing unit or the like that rotatably supports a wheel of an automobile, and more specifically, rationalizes a combination seal ring on a side equipped with a tone wheel by reducing the number of parts. It is about technology.
[0002]
[Prior art]
Conventionally, in order to detect the rotational speed of a wheel in order to support the wheel of an automobile rotatably with respect to a suspension system and to control an anti-lock brake system (ABS) or a traction control system (TCS), the fixed side It incorporates a bearing equipped with a tone wheel that constitutes an encoder in a pair with the magnetic sensor installed in the. Of the pair of left and right seal rings that block the end opening of the bearing, the tone wheel is often equipped integrally with the rotation side portion of the inner seal ring that is the inner side of the vehicle body. The one shown in 1 is known.
[0003]
That is, the vehicle speed detection encoder is composed of a tone wheel attached to the wheel side (rotation side) and a magnetic sensor disposed close to the tone wheel and facing the fixed side (non-rotation side). A tone wheel, which is a ring in which an anode and a negative electrode are alternately magnetized, is fixed to a core metal (called a slinger) of a seal ring in a bearing.
[0004]
As the structure of the bearing portion, there are various types. For example, as shown in FIG. 9, the lateral end surface 32a of the outer ring 32 on the fixed side protrudes from the lateral end surface 31a of the inner ring 31 on the rotating side in the bearing B. In the case of the configuration, since the distance between the magnetic sensor 42 and the tone wheel 33 provided on the outer ring 32 is too wide, the tone wheel 33 is integrated with the seal ring as shown in the above-mentioned Patent Document 1. Can not be incorporated into. Therefore, in such a case, as shown in FIG. 9, a flanged cylindrical sheet metal support ring 34 to which the tone wheel 33 is fixed by bonding or the like is formed as a separate component from the inner seal ring 35. The inner ring 31 is fitted.
[0005]
As the seal ring in such a configuration, as shown in FIG. 9, a seal having two seal lips 37 a and 37 b slidably contacting the outer peripheral surface of the inner ring 31 on an outer core metal 36 fitted in the outer ring 32. As shown in FIG. 10, a single seal ring 38 having a two-lip structure integrally provided with the member 37, a first metal core 39 fitted to the inner ring 31, and three seal lips 40a to 40c slidably in contact therewith. Is a three-lip structure combination seal ring (also referred to as a pack seal) 41 that is integrally mounted on an outer core metal 43 fitted inside the outer ring 32.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-62305
[Problems to be solved by the invention]
The former seal structure shown in FIG. 9 is advantageous in terms of cost because it has a small number of parts, but it can be used in places where it is used in harsh environments because of the two-lip structure only in the radial direction in sliding contact with the outer peripheral surface of the inner ring. This is disadvantageous in terms of sealing performance. The latter seal structure shown in FIG. 10 is a three-lip structure that slides in both the radial direction and the axial direction on the first metal core having an L-shaped cross section, and is advantageous in that it has excellent sealing performance that can be used in harsh environments. However, on the other hand, the number of parts increases, which is disadvantageous with respect to parts management and costs.
[0008]
As described above, the former and the latter seal structures have their advantages and disadvantages, so they are properly used according to the place of use and purpose. However, the inner seal ring equipped with a tone wheel is generally used. Since the high sealing performance is required, the latter sealing structure shown in FIG. 10 is frequently used.
[0009]
Therefore, an object of the present invention is to provide a streamlined seal structure that is advantageous in terms of cost while having a combined seal ring that is excellent in sealing performance by a structural device of a bearing portion having a tone wheel and a seal ring. .
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, an annular first cored bar and an annular second cored bar having a seal member on which a slidable contact with the first cored bar is formed are a fixed side member and a rotary side member. In the seal structure of the bearing portion provided with a combination seal ring that is distributed and supported and a ring-shaped tone wheel on the rotation side member,
The tone wheel is attached to an annular support member that is fitted to the rotation side member, and the opposite side of the support member to the side on which the tone wheel is attached is extended, and the extended portion is the first core metal or the second core. It is formed on a cored bar.
[0011]
According to the configuration of claim 1, the details will be described in the section of the embodiment, but the support member for mounting the tone wheel also serves as the first or second core bar, and the number of parts is one. Can be reduced. That is, in the related art, the first core metal, the seal member, the second core metal, the tone wheel, and the support member were five components. However, in the configuration of claim 1, for example, the seal member, the second core metal, Four components such as a tone wheel and a support member are sufficient.
[0012]
As a result, it was possible to reduce the number of parts while simplifying the bearing structure using the combination seal ring and having excellent sealing performance, thereby facilitating parts management, reducing costs, and streamlining.
[0013]
According to a second aspect of the present invention, in the configuration of the first aspect, the extending portion is formed on the standing wall portion that rises from the rotating side member toward the stationary side member, and the lip is slidably contactable with the standing wall portion. In addition to being formed on the axial lip, the seal member is formed with a radial lip that is slidable on the peripheral surface of the rotating member.
[0014]
According to the configuration of the second aspect, the extending portion of the support member for mounting the tone wheel is formed on the standing wall portion where the axial lip of the seal member is in sliding contact, and the radial lip formed on the seal member is the rotating member. Compared to the conventional structure in which the radial lip is slidably contacted with the peripheral surface of the fitting tube portion, which is the portion fitted to the rotation side member of the first core bar, Since there is no fitting cylinder part, the radial length of the seal member, that is, the combined seal ring can be made compact.
[0015]
According to a third aspect of the present invention, in the configuration of the first or second aspect, the stationary member is an inner ring for constituting the bearing, the rotating member is an outer ring for constituting the bearing, and the extending portion is the first one. It is characterized by being formed on a single cored bar.
[0016]
According to the configuration of the third aspect, the inner ring is on the rotating side, which is suitable as a bearing structure for a drive wheel that needs to be provided with rotating portions on both ends of the bearing, and the first core made of one component. Since it can also be used as a gold, it is composed of two parts, and the second core, which is a more complex part than the first core, can be used in the same way as before, so there is little change in production equipment. There are also advantages.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a bearing unit A that functions as an angular bearing that rotatably supports a driven wheel (a rear wheel of an FF vehicle, a front wheel of an FR vehicle, etc.) such as a tire of an automobile, and the surrounding structure. FIG. 2 shows an enlarged cross-sectional view of the bearing portion 3 in the bearing unit A, and FIG. 3 shows an enlarged cross-sectional view of the inner side (vehicle body side and right side in FIG. 1) portion of the bearing portion 3. It is.
[0018]
As shown in FIG. 1, the bearing unit A is bolted to a hub 1 having a plurality of studs 4 for detachably attaching a wheel with tire (not shown) and a support member on the vehicle body side such as a frame. The hub carrier 2 is attached and fixed by the above, and the bearing portion 3 is formed integrally between the two. The bearing unit A is equipped with an encoder E for detecting the rotational speed of the wheel, which is necessary for ABS (anti-lock brake), traction control, and the like.
[0019]
The bearing portion 3 includes inner ring portions 5 and 6 that are a part of the hub 1, an outer ring portion (an example of a fixed side member) 7 that is a part of the hub carrier 2, and an inner ring portion (an example of a rotation side member) 5. , 6 and the outer ring portion 7 and the left and right two rows of balls 8 arranged on a circumferential rolling track (not shown), and a retainer 9 for arranging these balls 8 at equal intervals in the circumferential direction. , 10. An annular outer seal 11 is provided on the outer side in the left-right direction of the vehicle body of the left and right rows of balls 8, and an annular inner seal 12 is provided on the inner side. The inner ring portion 6 on the inner side is tightly integrated by a processing process (so-called caulking process) in which the inner part of the center part of the hub 1 is plastically deformed after being fitted into the hub 1 by press fitting.
[0020]
As shown in FIG. 2, the outer seal 11 is configured by a fixed-side seal ring 14 (so-called double side lip seal) fitted into the inner periphery of the outer ring portion 7 by press fitting. The outer seal 11 has a plurality of (three places) lips 16a to 16c that are slidable on the curved outer peripheral surface of the inner ring portion 5 on a cylindrical outer core 15 made of a sheet metal having a substantially inverted L-shaped cross section. The seal member 16 made of a rubber material or the like having an integrated structure is integrally provided by a process such as baking.
[0021]
As shown in FIG. 3, the inner seal 12 includes a rotation-side seal ring 17 that is fitted into the outer periphery of the inner ring portion 6 by press-fitting, and a fixed-side seal ring 18 that is fitted into the inner periphery of the outer ring portion 7 by press-fitting. It is comprised in the combination seal which consists of. The rotation-side seal ring 17 includes a cylindrical portion 17a that is fitted to the inner ring portion 6, a support ring portion 17b that is bent toward the inner diameter side at the inner end in the left-right direction of the vehicle body, and an outer diameter side at the outer end in the left-right direction of the vehicle body. A bent metal core part (an example of a first metal core S1) 17c is formed on a cylindrical support ring made of a sheet metal having a substantially Z-shaped cross section.
[0022]
The fixed-side seal ring 18 is made of a sheet metal made of sheet metal having an inverted L-shaped cross section (an example of the second core metal S2) 19 and a rubber material having a plurality of lips 20a to 20c. The sealing member 20 formed is integrally configured by a process such as baking. The first lip 20a which is the side with the largest diameter is formed as an axial lip which can be slidably contacted with the cored bar portion 17c which is the standing wall portion of the support ring 17, and the second and second lips which are the other two lips. The three lips 20b and 20c are formed as radial lips that are slidable directly on the outer peripheral surface of the inner ring 6.
[0023]
The sealing member 20 is formed with a cylindrical portion 20d that covers the inner peripheral surface of the fitting cylindrical portion 19a that is fitted into the outer ring portion 7 of the outer metal core 19, and the tip-side inner peripheral surface of the cylindrical portion 20d A small gap r that can function as a labyrinth seal that restricts the inflow of dust is formed by providing a gap with the tip surface of the cored bar portion 17.
[0024]
As shown in FIG. 3, the encoder E for detecting the number of rotations includes a tone wheel 21 attached to a side surface of the support ring portion 17 b of the support ring 17, and a hub carrier 2 side in a state of being close to the tone wheel 21. The magnetic sensor 22 is fixedly equipped. The encoder E can freely detect the number of rotations of the wheel, that is, the inner ring part 5 per unit time with respect to the outer ring part 7, and functions as a rotational speed detection.
[0025]
As shown in FIG. 4, the tone wheel 21 is made of magnetic rubber magnetized in such a manner that S poles and N poles are alternately arranged at equal intervals over the circumferential direction. That is, the tone wheel 21 is formed by forming a rubber magnet in which magnetic powder such as ferrite is mixed in rubber in a ring shape, and the magnetization direction is changed alternately and at equal intervals over the circumferential direction. Yes.
[0026]
In the inner seal 12 according to this structure, the support ring 17 that is a support member of the tone wheel 21 is also used as a core metal (slinger) with which the seal member 20 is slidably contacted. It is advantageous in terms of management. Further, since the cored bar part 17c, which is an extending part, is raised from the outer end of the cylindrical part 17a going from the inner side to the outer side in the left-right direction of the vehicle body, a portion that induces moisture from the outside to the ball 8 part (FIG. 10). In other words, it is advantageous in terms of sealing performance. In addition, since the two radial lips 20b, 20c are in direct sliding contact with the outer peripheral surface of the inner ring portion 6, the seal shown in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2002-62305) is used. The advantage is that the space for arranging the seal member 20 can be made larger (wider) in the radial direction than in the case where it is slidably contacted with the metal core, or the radial dimension of the whole seal can be reduced by the thickness of the metal core. There is also.
[0027]
[Another embodiment]
<1> As shown in FIG. 5, the bearing portion 3 has a structure in which a bearing 23 as an independent part such as a ball bearing is interposed between the stationary member 2 and the rotating member 1 according to the present invention. Inner seal is applicable. The inner seal 12 in FIG. 5 is the same as that shown in FIG.
[0028]
<2> As the seal structure, as shown in FIG. 6, the seal member 20 is provided on the standing wall portion 24 c (an example of the second metal core S <b> 2) of the support member 24 that has the tone wheel 21 and is fitted to the rotary member 1. Can be integrally provided, and the inner seal 12 can be formed by fitting the first core bar S1 to the stationary member 2.
[0029]
<3> As shown in FIG. 7, the seal structure may have a structure in which the stationary seal ring 25 is arranged on the inner side in the vehicle body left-right direction of the standing wall portion 17 c in the inner seal 12. That is, the radial lips 20 b and 20 c of the seal member 20 that are integrally provided on the second core metal S <b> 2 that is fitted to the fixed side member 2 are in sliding contact with the outer peripheral surface of the cylindrical portion 17 a of the support member 17. Even in this structure, the support member 17 also serves as the first core bar S1, and the number of parts is reduced.
[0030]
<4> As the seal structure, as shown in FIG. 8, the first cored bar S1 in the inner seal 12 has an L-shaped cross section composed of a bent cylindrical part 26d and a standing wall part 26c of the support member 26. You may make it make all the lip | rips 20a-20c of a location slide-contact with 1st metal core S1.
[0031]
【The invention's effect】
As described above, the present invention provides an annular first cored bar, and an annular second cored bar having a seal member on which a slidable slidable contact is formed on the first cored bar. In the seal structure of the bearing portion provided with a combination seal ring that is divided and supported by the rotation side member and the rotation side member is equipped with a ring-shaped tone wheel, the tone wheel is fitted to the rotation side member. Since the opposite end of the support member to the side where the tone wheel is attached is extended and the extended portion is formed on the first core metal or the second core metal, the combination seal ring is attached. By using, it was possible to reduce the number of parts, while making the bearing structure seal structure excellent in sealing performance, making parts management easier, reducing costs, and streamlining. In particular, the end surfaces of the rotation side member and the fixed member are not aligned, and the tone wheel is suitable for a bearing portion having a structure arranged away from the end surface of the rotation side member. There is an advantage that can be combined.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a wheel bearing and its peripheral structure. FIG. 2 is an enlarged sectional view showing an outer seal portion of a bearing portion. FIG. 3 is an enlarged sectional view showing an inner seal portion of the bearing portion. Fig. 5 is a partial side view showing an arrangement state of magnetic poles in Fig. 5. Fig. 5 is a cross-sectional view of a main part showing a first alternative structure of the bearing. Fig. 6 is a cross-sectional view of a main part showing a second alternative structure of the bearing. FIG. 8 is a cross-sectional view of the main part showing the fourth separate structure of the bearing part. FIG. 9 is a cross-sectional view of the main part showing a fourth separate structure of the bearing part. Sectional view of the main part [FIG. 10] Cross-sectional view of the main part showing a conventional example of a bearing part having a combination seal ring [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotation side member 2 Fixed side member 12 Combination seal ring 17 Support member 17c Extension part, standing wall part 20 Seal member 20a-20c Lip S1 1st metal core S2 2nd metal core

Claims (3)

An annular first cored bar and an annular second cored bar having a seal member formed with a lip that is slidably contactable with the first cored bar are distributed and supported between the fixed side member and the rotating side member. And a seal structure for a bearing portion provided with a ring-shaped tone wheel on the rotating side member,
The tone wheel is attached to an annular support member fitted to the rotation side member, and the opposite side of the support member to the side on which the tone wheel is attached is extended. The seal structure of the bearing part currently formed in the metal core or the said 2nd metal core. The extending portion is formed in an upright wall portion that rises from the rotating side member toward the fixed side member, and the lip is formed in an axial lip whose tip portion is slidable in contact with the upright wall portion, and the seal The bearing structure seal structure according to claim 1, wherein the member is formed with a radial lip that is slidably contactable with a peripheral surface of the rotating member. The said fixed side member is an outer ring | wheel for comprising a bearing, The said rotation side member is an inner ring | wheel for comprising a bearing, and the said extension part is formed in the said 1st metal core. 2. The seal structure of the bearing part according to 2.

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