JP2017026124A - Seal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member which can improve the sealing performance of a fitting portion between an outside member and the seal member.SOLUTION: A seal member 10 comprises: a core grid 11 having a fitting cylinder part 110 which is fit and attached to an outside member or an inside member, and a thin-thickness part 111 which is formed thin in thickness at one end 110a of the fitting cylinder part in an axial L-direction; and an elastic member 12 which is firmly fixed to the core grid, and has an extension seal part 120 which is interposed in a compressed state. The extension seal part has a salient part 15 which is formed into a crest shape, and a circumferential face part 16 which is parallel with a fitting face of the fitting cylinder part fit with one member. The salient part has a most-protruded apex 15a, a first inclined part 15b which is located at a tip side in a fitting direction with respect to one member and whose inclination angle θ is 5 to 30 degrees, and a second inclined part 15c which is located at a rear side in a fitting direction with the apex sandwiched therebetween. A diameter D2 of the circumferential face part is set at a size between a diameter D1 of the fitting face of the fitting cylinder part fit with one member, and a diameter D3 of the apex.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sealing member such as a sealing device or a bearing cap used in a bearing device for a wheel support portion of an automobile or the like.

  Examples of the sealing member as described above include those disclosed in Patent Documents 1 to 4 below. These sealing devices disclosed in Patent Documents 1 to 4 are formed with a thin-walled portion or the like at one end portion of a core metal fitted to the inner peripheral surface of the outer ring, and a protruding portion protruding in a cross-sectional view, and the inner periphery of the outer ring A seal portion having a flat portion in a cross-sectional view parallel to the surface. And the sealing part improves the sealing performance between the outer ring and the cored bar.

JP-A-2005-331002 JP 2008-128281 A JP 2011-80499 A JP 2012-112494 A

However, if such a seal part is too large in volume or has a large rising inclination angle on the front side in the fitting direction of the protrusion, the seal part is not attached when the sealing device is mounted between the outer ring and the inner ring. If it is damaged or used for a long period of time, the seal part may sag, etc., the compression effect of the seal part may be reduced, and the air tightness may be reduced. Therefore, there is a demand for a material that can maintain the sealability for a long time while securing a portion that can absorb the volume of the seal portion.
The sealing device shown in FIG. 2 of Patent Document 1 has a structure that secures a clearance that allows escape deformation due to crushing of the protrusion in a parallel portion of the seal portion, and thus can reduce the volume of the seal portion. However, since the compression allowance is not secured in the part parallel to the inner peripheral surface of the outer ring, the seal part sags after long-term use, and there is concern about the fitting force and sealing performance between the outer ring and the metal core. There is a risk of escaping.
The protrusion shown in FIG. 4 of Patent Document 1 and FIG. 1 of Patent Document 2 has a large rising inclination angle on the front side in the fitting direction, and the sealing device shown in FIG. Different inclined portions are configured in two stages, and the rising inclination angle of the inclined portion on the side in the fitting direction is large, and the protruding portion rises rapidly. When the rising inclination angle on the front side in the fitting direction of the protruding portion thus protruding is large, the protruding portion may be cut or scratched when the sealing device is mounted.
Further, the protrusions disclosed in FIG. 4 of Patent Document 1, FIG. 1 of Patent Document 2, FIG. 4B of Patent Document 3, and FIG. Has been. Since the top of the protrusion has a smaller force pushing the inner peripheral surface of the outer ring than the Yamagata, a higher sealing property is required.

  This invention is made | formed in view of the said situation, and it aims at providing the sealing member which can improve the sealing performance of the fitting part of an outer side member and a sealing member.

A seal member according to the present invention is a seal member that seals an opening of an annular space formed between an outer member and an inner member that rotate relatively coaxially, and is any one of the outer member and the inner member. A cored bar having a fitting cylindrical part fitted and attached to one member, and a thin-walled part formed thinner than the other part at one end in the axial direction of the fitting cylindrical part; An elastic member that is fixed to a cored bar and has an extension seal part that covers the thin part and is formed so as to be interposed between the thin part and the one member in a compressed state. The seal portion includes a raised portion formed in a mountain shape in a cross-sectional view along the axial direction, and a circumferential surface portion parallel to a fitting surface of the fitting cylindrical portion with respect to the one member. The top part is the most projecting top part and the one member is sandwiched across the top part. A first inclined part located on the front side in the fitting direction and having an inclination angle of 5 ° to 30 °, and a second inclined part located on the rear side in the fitting direction across the top part, The circumferential surface portion is continuous with the second inclined portion, and a diameter thereof is a size between a diameter of a fitting surface with the one member in the fitting cylindrical portion and a diameter of the top portion. It is characterized by that.
According to the above configuration, since the inclination angle of the first inclined portion of the raised portion rises at a gentle angle of 5 ° to 30 °, the seal member is fitted to either the outer member or the inner member. When combining, the resistance generated when the first inclined portion abuts against one member can be relaxed. Accordingly, it is possible to prevent damages such as cutting of the rising portion of the first inclined portion and generation of scratches.
Further, since the raised portion has a mountain shape and has a top portion, when the seal member is fitted to one member, the top portion is in line contact with the fitting surface of the one member and compressed. Then, the compression reaction force can be brought into close contact with the fitting surface to improve the sealing performance.
The circumferential surface portion is a surface parallel to the fitting surface, and the diameter thereof is a size between the diameter of the fitting surface with the one member in the fitting cylindrical portion and the diameter of the top portion. As a result, the compression reaction force of the raised portion is increased, and even if the extended seal portion sags due to deterioration with time, intrusion of dust, muddy water, etc. from the outside can be prevented. Therefore, the rust generation of the core metal can be prevented. Further, the sealing performance can be maintained against the internal pressure rise, and the sealing performance can be maintained for a long time.

The seal member according to the present invention is a seal member that seals an opening of an annular space formed between an outer member and an inner member that rotate relatively coaxially, and is any of the outer member and the inner member. A fitting cylindrical part fitted and attached to one of the members, a bent part formed by bending diagonally from one end part of the fitting cylindrical part, and one end part of the bent part A cored bar having a flange part extending in the radial direction, and fixed to the cored bar, covers the bent part, and is interposed between the bent part and the one member in a compressed state. An elastic member having an extending seal portion formed as described above, wherein the extending seal portion is formed in a mountain shape in a cross-sectional view along the axial direction, and the fitting cylindrical portion And a circumferential surface portion parallel to the fitting surface for one member, the raised portion, A projecting top portion, a first inclined portion positioned on the front side in the fitting direction with respect to the one member across the top portion, and an inclination angle of 5 ° to 30 °, and the fitting across the top portion A second inclined portion located on the rear side in the direction, and the circumferential surface portion is continuous with the second inclined portion, and the diameter of the fitting surface with the one member in the fitting cylindrical portion is The size is between the diameter and the diameter of the top portion.
Also with the above configuration, since the inclination angle of the first inclined portion of the raised portion rises at a gentle angle of 5 ° to 30 °, the seal member is fitted to either the outer member or the inner member When doing, the resistance which a 1st inclination part contact | abuts to one member and which arises can be relieve | moderated. Accordingly, it is possible to prevent damages such as cutting of the rising portion of the first inclined portion and generation of scratches.
Further, since the raised portion has a mountain shape and has a top portion, when the seal member is fitted to one member, the top portion is in line contact with the fitting surface of the one member and compressed. Then, the compression reaction force can be brought into close contact with the fitting surface to improve the sealing performance.
The circumferential surface portion is a surface parallel to the fitting surface, and the diameter thereof is a size between the diameter of the fitting surface with the one member in the fitting cylindrical portion and the diameter of the top portion. As a result, the compression reaction force of the raised portion is increased, and even if the extended seal portion sags due to deterioration with time, intrusion of dust, muddy water, etc. from the outside can be prevented. Therefore, the rust generation of the core metal can be prevented. Further, the sealing performance can be maintained against the internal pressure rise, and the sealing performance can be maintained for a long time.
In addition, the bent portion formed obliquely can secure a clearance for the extended seal portion interposed in a compressed state with one member, and can prevent overcompression.

In this invention, the 2nd circumferential surface part parallel to the said fitting surface is formed in the front side of the said fitting direction of the said 1st inclination part, The said 2nd circumferential surface part is the said fitting surface. It may be formed so as not to protrude further.
In this case, since the second circumferential surface portion that does not protrude from the fitting surface as described above is formed, the fitting force between the one member and the fitting cylindrical portion of the core metal can be satisfactorily maintained. it can. Further, since the shear stress hardly acts on the extended seal portion, the extended seal portion can be hardly peeled off.

In the present invention, a third inclined portion that is inclined in the same direction as the second inclined portion may be formed on the rear side in the fitting direction of the circumferential surface portion.
In this case, the escape place of the extended seal portion after the seal member is fitted and attached to one member can be secured, and an appropriate seal stress can be secured.
In the present invention, a third circumferential surface portion parallel to the fitting surface is formed on the rear side in the fitting direction of the third inclined portion, and the third circumferential surface portion is a front fitting. You may make it form so that it may not protrude from a surface.
In this case, the escape place of the extended seal portion after the seal member is fitted and attached to one member can be secured, and an appropriate seal stress can be secured.

In the present invention, in the case where the thin metal part has the thin part, the thin part is formed so as to have a radial gap with respect to the one member, and the thin part and the fitting cylindrical part The step portion may be formed to be inclined, and the extending seal portion may be formed from a midway position of the step portion.
Further, in the present invention, in the case where the bent portion is provided on the metal core, the extended seal portion is formed from the middle position of the bent portion. In any of these cases, the extended seal portion is sheared. Since the stress hardly acts, it is possible to prevent the extension seal portion from peeling off.

  According to the sealing member of the present invention, it is possible to improve the sealing performance of the fitting portion between one of the outer member and the inner member and the cored bar.

It is a schematic longitudinal cross-sectional view which shows an example of the bearing apparatus with which the sealing member which concerns on this invention is applied. It is an enlarged view of the X section of Drawing 1, and is a figure showing a 1st embodiment of a sealing member concerning the present invention. (A)-(c) is an explanatory view equivalent to the enlarged view of the X1 section of Drawing 2, showing the modification of the seal member. It is a figure which shows 2nd Embodiment of the sealing member which concerns on this invention. It is an enlarged view of the Y section of Drawing 1, and is a figure showing a 3rd embodiment of a sealing member concerning the present invention. (A)-(c) is the explanatory view which shows the modification of the seal member, and is equivalent to the enlarged view of the Y1 part of FIG. (A) is a figure which shows 4th Embodiment of the sealing member based on this invention, (b) is a figure which shows the modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The seal member according to the present embodiment is not limited to the illustrated example, and the shape and configuration of the extended seal portion can also be applied as a protective cover, that is, a cap seal shown in Patent Document 4 and FIG. However, below, the example applied as a bearing seal with which the bearing apparatus 1 as shown in FIG. 1 is mounted | worn is demonstrated.

  FIG. 1 shows a bearing device 1 that supports a wheel (not shown) of an automobile so as to be axially rotatable. This bearing device 1 generally includes an outer ring 2 as an outer member, a hub ring 3, an inner ring member 4 fitted and integrated with the vehicle body side of the hub ring 3, an outer ring 2, the hub ring 3, and an inner ring member. 4 and two rows of rolling elements (balls) 6 interposed therebetween. In this example, the hub ring 3 and the inner ring member 4 constitute an inner ring 5 as an inner member. The outer ring 2 is fixed to a vehicle body (not shown) of the automobile. A drive shaft 7 is coaxially spline-fitted to the hub wheel 3, and the drive shaft 7 is connected to a drive source (drive transmission unit) (not shown) via a constant velocity joint 8. The drive shaft 7 is integrated with the hub wheel 3 by a nut 9 to prevent the hub wheel 3 from being detached from the drive shaft 7. The inner ring 5 (the hub ring 3 and the inner ring member 4) is rotatable around the axis L with respect to the outer ring 2, and the outer ring 2 and the inner ring 5 constitute two members that rotate relatively. An annular space S is formed between the members. In the annular space S, two rows of rolling elements 6 are interposed so as to roll the raceway of the outer ring 2, the hub ring 3, and the raceway of the inner ring member 4 while being held by the retainer 6 a. Yes. The hub wheel 3 has a cylindrical hub wheel main body 30 and a hub flange 32 formed so as to extend radially outward from the hub wheel main body 30 via a rising base portion 31. The wheels are attached and fixed by nuts (not shown). In the following, the side facing the wheel along the axis L direction (the side facing the left side in FIG. 1) is referred to as the wheel side, and the side facing the vehicle body (the side facing the right side) is referred to as the vehicle body side.

  The annular space S forms a bearing space, and is an opening 2a, 2c at both ends along the axis L direction of the annular space S, between the outer ring 2 and the inner ring member 4, between the outer ring 2 and the hub ring 3. Between them, seal members 10 and 20 are mounted, respectively, and the openings 2a and 2c along the axis L direction of the annular space S are sealed by the seal members 10 and 20. This prevents intrusion of muddy water or the like into the annular space S and leakage of the lubricant (grease or the like) filled in the annular space S to the outside.

First, the seal member 10 on the vehicle body side of the seal members 10 and 20 will be described with reference to FIG. FIG. 2 shows the seal member 10 according to the first embodiment, and is an enlarged view of a portion X in FIG. The seal member 10 is mounted between the outer ring 2 and the inner ring 5, and the opening 2 a of the annular space S formed between the outer ring 2 and the inner ring 5 is sealed by the seal member 10. In FIG. 2, 2 e is a chamfered portion formed at the lower corner of the outer ring 2.
The seal member 10 is fitted and fixed to the inner ring 5 (inner ring member 4), the core metal 11 fitted into the outer ring 2 and having a substantially L-shaped cross section, the elastic member 12 made of rubber fixed to the core metal 11, and the inner ring 5 (inner ring member 4). This is a so-called pack seal type which is configured by combining with a slinger 13 having a substantially L-shaped cross section. In FIG. 2, reference numeral 40 indicated by a two-dot chain line is a magnetic sensor fixedly disposed on a stationary member of the vehicle body, and the rotation of the inner ring 5 is performed by the magnetic sensor 40 and the annular encoder 14 fixed to the slinger 13. A detection mechanism is configured.

  The core metal 11 is made of a metal material or the like and has a ring shape that is processed by sheet metal. The core metal 11 is formed to be thinner than the other portions at the fitting cylindrical portion 110 fitted inside the inner diameter surface 2b of the outer ring 2 and the one end portion 110a on the vehicle body side in the axis L direction of the fitting cylindrical portion 110. The thin-walled portion 111 and the inward flange portion 112 extending from the other end portion 110b on the annular space S side of the fitting cylindrical portion 110 to the inner diameter side are provided. The thin portion 111 is formed on the entire circumference of the one end portion 110a of the fitting cylindrical portion 110 on the side opposite to the annular space S, and the thickness thereof is about 1/4 to 2/3 of the thickness of the fitting cylindrical portion 110. The The thin-walled portion 111 has a radial gap with respect to the outer ring 2 so that the extended seal portion 120 that covers the thin-walled portion 111 contacts the outer ring 2 when the seal member 10 is assembled between the outer ring 2 and the inner ring 5. Is formed to have. In the figure, 111a is the outer peripheral surface of the thin portion 111, 111b is the step portion, 111c is the end of the thin portion 111, and the outer peripheral surface 111a is a surface parallel to the fitting surface 110c of the fitting cylindrical portion 110. The step portion 111b is an inclined surface inclined in the same direction as a second inclined portion 15c described later. The end portion 111c is covered with the elastic member 12, and is configured so that the core metal 11 is not exposed, and the occurrence of rust can be suppressed even when subjected to an attack such as muddy water.

The elastic member 12 is made of a rubber material selected from NBR, H-NBR, ACM, AEM, FKM, and the like, and is integrally fixed to the core metal 11 by vulcanization molding. The elastic member 12 includes an extended seal portion 120, a seal lip base portion 121, a side lip 122, and radial lips 123 and 124.
The extension seal portion 120 covers the thin portion 111 of the core metal 11 and is formed so as to be interposed between the thin portion 111 and the outer ring 2 in a compressed state. In this way, the extended seal portion 120 is interposed between the thin portion 111 and the inner diameter surface 2b of the outer ring 2 in a compressed state, so that muddy water or the like is provided between the inner diameter surface 2b of the outer ring 2 and the fitting cylindrical portion 110. Can be prevented, and rusting of the inner surface 2b of the outer ring 2 and the fitting surface 110c of the fitting cylindrical portion 110 can be prevented.
The extended seal portion 120 will be described in detail later.

  The seal lip base 121 covers a surface 112a on the opposite side (vehicle body side) to the annular space S of the inward flange portion 112 of the core metal 11, and a part of the seal lip base 121 wraps around the inner peripheral edge portion 112c and is integrally fixed. Further, the seal lip base 121 is formed so as to cover the surface 111 d on the inner ring member 4 side of the fitting cylindrical portion 110 and to extend to the end 111 c of the thin portion 111. Then, one side lip 122 and two radial lips 123 and 124 are formed extending from the seal lip base 121 toward the slinger 13.

The slinger 13 has a ring shape that is sheet-metal processed with stainless steel (SUS430 or the like). The slinger 13 is a circle extending to the outer diameter side from the slinger cylindrical portion 131 fitted to the outer diameter surface 4a of the inner ring 5 (inner ring member 4) and the end 131a opposite to the annular space S of the slinger cylindrical portion 131. And a plate portion 130. The side lip 122 fixed to the core metal 11 is formed so as to elastically contact the disc portion 130 of the slinger 13, and the radial lips 123 and 124 are formed so as to elastically contact the slinger cylindrical portion 131. In FIG. 2, the two-dot chain line portions of the side lip 122 and the radial lips 123, 124 indicate the original shape before elastic deformation.
An annular encoder 14 made of a rubber material containing magnetic powder is fixedly integrated with a surface 130a on the vehicle body side of the disc portion 130 of the slinger 13 by vulcanization adhesion. A large number of N and S poles are alternately magnetized on the magnetized surface 14a of the annular encoder 14 along the circumferential direction. A magnetic sensor 40 is installed in a vehicle body (not shown) so as to face the annular encoder 14, and a rotation detection mechanism of the inner ring 5 is configured by detecting a magnetic change accompanying the rotation of the annular encoder 14 by the magnetic sensor 40. .

Next, the extension seal part 120 fixed to the thin part 111 of the core metal 11 will be described with reference to the enlarged view of FIG. 2, the two-dot chain line portion of the extension seal portion 120 shows the original shape before compression, and the enlarged view of FIG. 2 illustrates the original shape before the extension seal portion 120 is compressed. The two-dot chain line portion here shows a part of the outer ring 2.
The extension seal portion 120 has a raised portion 15 formed in a mountain shape in a cross-sectional view along the axis L direction, and a circumferential surface portion 16 parallel to the fitting surface 110c for the outer ring 2 in the fitting cylindrical portion 110. ing.

The raised portion 15 is the most projecting top portion 15a, the first inclined portion 15b that is located on the front side in the fitting direction A1 with respect to the outer ring 2 across the top portion 15a, and whose inclination angle θ is 5 ° to 30 °, It has the 2nd inclination part 15c located in the back side of fitting direction A1 across the top part 15a. Specifically, the raised portion 15 shown in FIG. 2 includes a first inclined portion 15b formed to be inclined so that the diameter gradually increases from the front side in the fitting direction A1 to the top portion 15a, and a top portion 15a. And a second inclined portion 15c formed to be inclined so as to be gradually reduced in diameter. The 1st inclination part 15b is made into the flat inclined surface comprised continuously by the fixed inclination which does not have a dent, a hollow, and the location which protruded in the middle (it does not have an unevenness | corrugation). The formation position of the top portion 15 c is formed so as to be positioned closer to the annular space S than the chamfered portion 2 e of the outer ring 2.
The step size B (projection size) from the fitting surface 110c to the top portion 15a may be, for example, about 0.13 to 0.17 mm. At this time, the dimension A from the end part 15ba on the front side in the fitting direction A1 of the first inclined part 15b to the top part 15a is set with the step angle B of the inclination angle θ of 5 ° to 30 °.

According to the above configuration, since the inclination angle θ of the first inclined portion 15b of the raised portion 15 rises at a gentle angle of 5 ° to 30 °, the seal member 10 is fitted between the outer ring 2 and the inner ring 5. When combined, the resistance generated by the first inclined portion 15b coming into contact with the inner diameter surface 2b of the outer ring 2 can be reduced. Therefore, it is possible to prevent damage such as cutting of the rising portion of the first inclined portion 15b and generation of scratches.
Further, since the raised portion 15 has a mountain shape and has a top portion 15a, when the fitting cylindrical portion 110 is fitted to the outer ring 2, the top portion 15a comes into line contact with the inner diameter surface 2b of the outer ring 2 and is compressed. In this state, the compression reaction force can be brought into close contact with the inner diameter surface 2b to improve the sealing performance.

The circumferential surface portion 16 is continuous with the second inclined portion 15c, and its outer diameter D2 is between the outer diameter D1 of the fitting surface 110c with the outer ring 2 in the fitting cylindrical portion 110 and the outer diameter D3 of the top portion 15a. It is said that the size. That is, as is clear from the enlarged view of FIG. 2, the dimensional relationship among the outer diameter D2 of the circumferential surface portion 16, the outer diameter D1 of the fitting surface 110c, and the outer diameter D3 of the top portion 15a is D1 <D2 <D3. The The surface 16a constituting the circumferential surface portion 16 is a continuous flat surface having no depressions, depressions, or protruding portions (no irregularities) in the middle thereof, and the fitting direction A1 of the circumferential surface portion 16 from the top portion 15a. The dimension C up to the rear end 16aa may be less than 0.15 mm.
The circumferential surface portion 16 is a surface parallel to the inner diameter surface 2b and the fitting surface 110b of the outer ring 2, and the fitting cylindrical portion 110 of the core metal 11 fitted to the inner diameter surface 2b of the outer ring 2; The outer diameter D2 is set to a size between the outer diameter D1 of the fitting surface 110c and the outer diameter D3 of the top portion 15a.

According to the above configuration, the compression reaction force of the raised portion 15 can be increased, and even if the extended seal portion 120 sags due to deterioration with time, intrusion of dust, muddy water, and the like from the outside can be prevented. Furthermore, it is possible to prevent rusting from occurring on the inner diameter surface 2b of the outer ring 2 and the fitting surface 110c (that is, the metal fitting portion) of the fitting cylindrical portion 110 of the core metal 11. Further, the sealing performance can be maintained against the internal pressure rise, and the sealing performance can be maintained for a long time.
If the dimension C is set as described above, the metallic thin portion 111 is disposed on the radially inner side of the circumferential surface portion 16, so that the extension seal portion 120 presses the inner diameter surface 2 b of the outer ring 2. Airtightness can be ensured without losing power.

Further, a second circumferential surface portion 17 parallel to the fitting surface 110c is formed on the front side in the fitting direction A1 of the first inclined portion 15b of the seal member 10 shown in FIG. 2, and this second circumferential surface portion. 17 is formed so as not to protrude to the outer diameter side from the fitting surface 110c. Specifically, the outer diameter D1 of the fitting surface 110c and the diameter of the second circumferential surface portion 17 are formed to be substantially the same, and a flat surface is formed so as to continue from the fitting surface 110c.
Therefore, when the cored bar 11 is pushed in with the jig in the fitting direction A1 so that the fitting cylindrical part 110 is fitted to the inner diameter surface 2b of the outer ring 2, the second circumferential surface part of the extension seal part 120 is used. Since 17 is formed so as not to protrude from the fitting surface 110 c, the metal fitting between the outer ring 2 and the fitting cylindrical portion 110 of the core metal 11 is not affected.
In addition, the first inclined portion 15b has a structure in which the inclination angle θ rises at a moderate angle of 5 ° to 30 ° behind the fitting direction A1 of the second circumferential surface portion 17 formed in this way. Therefore, it is possible to make it difficult for shear stress to act on the raised portion 15 during fitting, and to prevent the extended seal portion 120 from peeling off, tearing, scratching, or the like. Here, when the inclination angle θ is smaller than 5 °, the protruding amount as the raised portion 15 is insufficient, and the expected sealing performance tends not to be satisfied. Further, when the inclination angle θ is larger than 30 °, the rising inclination angle of the raised portion 15 is increased. For example, when the seal member 10 is mounted between the outer ring 2 and the inner ring 5, the raised portion 15 is damaged. When used for a long period of time, the extension seal portion 120 is likely to sag, and the compression effect of the extension seal portion 120 tends to decrease.

Further, in the sealing member 10 shown in FIG. 2, a third inclined portion 18 that is inclined in the same direction as the second inclined portion 15c is formed on the rear side of the circumferential surface portion 16 in the fitting direction A1.
Thus, when the thin part 111 is formed in the metal core 11 and the extension seal part 120 is provided, if the volume of the extension seal part 120 is too large, the extension seal part 120 may be damaged, or it may be used for a long time. Sagging may occur. Therefore, the seal member 10 shown in FIG. 2 forms a third inclined portion 18 inclined in the same direction as the second inclined portion 15c on the rear side in the fitting direction A1 of the circumferential surface portion 16 of the extended seal portion 120. Thus, it becomes a refuge for the raised portion 15 and the circumferential surface portion 16 that are compressed by the inner diameter surface 2b, and an appropriate sealing stress can be secured.

Next, a modified example of the seal member 10 will be described with reference to FIGS.
3A to 3C are explanatory views corresponding to an enlarged view of a portion X1 in FIG. 2, and the extended seal portions 120A to 120C shown here are modifications of the extended seal portion 120 shown in FIG. It is an example. In FIG. 3, the two-dot chain line portion indicates the outer shape of the outer ring 2, and the position of the line below the two-dot chain line portion is the inner diameter surface 2 b in which the fitting cylindrical portion 110 of the seal member 10 is fitted. The positions where the extended seal portions 120A to 120C are compressed are shown. In addition, although illustration about the dimensional relationship of the outer diameter D1 of the fitting surface 110c of the extension seal | sticker parts 120A-120C, the outer diameter D2 of the circumferential surface part 16, and the outer diameter D3 of the top part 15a is abbreviate | omitted, these The dimensional relationship of D1 <D2 <D3 is the same as that of the extended seal portion 120.

First, in the example shown in FIG. 3A, the second circumferential surface portion 17 is formed so as not to protrude to the outer diameter side from the fitting surface 110c, and the second circumferential surface portion 17 is located at a midpoint of the stepped portion 111b ( It is formed from the start end portion 111ba of the surface constituting the stepped portion 111b (a position approximately 1/3 from the boundary between the fitting surface 110c and the stepped portion 111b).
By forming the extending seal portion 120A in this way, a step difference of d1 (see FIG. 3A) is formed in the radial direction between the fitting surface 110c and the second circumferential surface portion 17. Become. Therefore, the presence of the extended seal portion 120 </ b> A does not affect the metal fitting portion between the inner diameter surface 2 b of the outer ring 2 and the fitting cylindrical portion 110 of the core metal 11. Further, since the shear stress hardly acts on the extended seal portion 120A, the extended seal portion 120A can be hardly peeled off.

In the example shown in FIG. 3B, the second circumferential surface portion 17 is not provided, but the first inclined portion 15b is located approximately halfway from the step portion 111b (from the start end portion 111ba of the surface constituting the step portion 111b). / 3 position).
In this example, a step corresponding to d2 is formed as in the example of FIG. Also in this case, the presence of the extended seal portion 120B does not affect the metal fitting portion between the inner diameter surface 2b of the outer ring 2 and the fitting cylindrical portion 110 of the core metal 11 as in the example of FIG. Further, since the shear stress hardly acts on the extended seal portion 120B, the extended seal portion 120B can be hardly peeled off.
Further, if the dimensions of d1 and d2 are about the compression allowance after mounting of the seal member 10 as shown in the figure, it becomes a refuge for the raised portion 15 subjected to compression by the inner diameter surface 2b, and ensures an appropriate seal stress. Can do.

The example shown in FIG. 3C is an example in which the extended seal portion 120C does not have the second circumferential surface portion 17 and the steps of d1 and d2 as shown in FIGS. 3A and 3B.
In this example, the first inclined portion 15b is formed from the start end portion 111ba of the stepped portion 111b (the boundary between the fitting surface 110c and the stepped portion 111b). Also in this case, the inclination angle θ of the first inclined portion 15b of the raised portion 15 is configured to rise at a gentle angle of 5 ° to 30 °, and exhibits the same effect as the example of the first embodiment shown in FIG. .

Next, a seal member 10A according to the second embodiment will be described with reference to FIG. The same reference numerals are given to the same parts as those in the above-described embodiment, and the description of the operation and effect is omitted.
The seal member 10A of the second embodiment is also common in that it is a pack seal type that is attached to the opening 2a on the vehicle body side in the same manner as the seal member 10 of the first embodiment. 11 is different in that a thin portion 111 is not formed and a bent portion 113 is provided. Another difference is that the annular encoder 14 is not fixed to the slinger 13 and the slinger seal portion 19 is fixed to the disc portion 130 and the bent portion 132 of the slinger 13.

  The core metal 11 includes a fitting cylindrical portion 110 that is fitted inside the inner diameter surface 2b of the outer ring 2 and a bent portion that is bent obliquely in the inner diameter direction from the other end portion 110b on the annular space S side of the fitting cylindrical portion 110. 113 and an inward flange portion 112 that is coupled to one end portion 113a on the annular space S side of the bent portion 113 and is formed to extend in the inner diameter direction. When the sealing member 10A is assembled between the outer ring 2 and the inner ring 5, the bent part 113 is attached to the outer ring 2 so that the extended seal part 120D that covers the bent part 113 contacts the inner diameter surface 2b of the outer ring 2. On the other hand, it is formed to have a gap in the radial direction. The inclination angle of the bent portion 113 is not particularly limited, but is about 20 ° to 50 °.

The elastic member 12 includes an extension seal portion 120D, a seal lip base portion 121, a side lip 122, and radial lips 123 and 124. The extension seal portion 120D covers the annular space S side of the bent portion 113. The bent portion 113 and the outer ring 2 are formed so as to be interposed in a compressed state.
The seal lip base 121 covers the surface 112b on the annular space S side of the inward flange portion 112 of the core metal 11, and wraps around the inner peripheral edge portion 112c to reach the surface 112a on the vehicle body side, and is integrally fixed. One side lip 122 and two radial lips 123 and 124 are formed to extend toward the slinger 13 from the seal lip base 121.

  The slinger 13 is formed by bending a slinger cylindrical portion 131 fitted to the outer ring surface 4a of the inner ring member 4 and an end portion 131a on the opposite side (vehicle body side) of the slinger cylindrical portion 131 from the annular space S. The bent portion 132 and the disc portion 130 extending from the end portion 132a opposite to the annular space S of the bent portion 132 to the outer diameter side are provided. The side lip 122 fixed to the core metal 11 is formed so as to elastically contact the disc portion 130 of the slinger 13, and the radial lips 123 and 124 are formed so as to elastically contact the slinger cylindrical portion 131. In FIG. 4, the two-dot chain line portions of the side lip 122 and the radial lips 123, 124 indicate the original shape before elastic deformation.

A slinger seal portion 19 made of a rubber material selected from NBR, H-NBR, ACM, AEM, FKM, and the like is fixed to and integrated with the surface 130a on the vehicle body side of the disc portion 130 of the slinger 13 by vulcanization molding. . The slinger seal portion 19 covers the end portion 130b on the outer ring 2 side of the disc portion 130, and a protruding lip 190 that protrudes toward the fitting cylindrical portion 110 of the core metal 11 is formed in a portion covering the end portion 130b. Has been. Thereby, it is comprised so that a muddy water etc. may not permeate from the clearance gap formed between the edge part 130b of the disc part 130, and the fitting cylindrical part 110. FIG.
On the other hand, on the inner ring member 4 side of the slinger seal portion 19, an extension seal portion 120 </ b> E is provided so as to cover the bent portion 132 and be interposed between the inner ring member 4 in a compressed state.

The enlarged views shown in the upper and lower portions in FIG. 4 show the extension seal portions 120D and 120E fixed to the bent portions 113 and 132. Each of the two enlarged views of FIG. 4 is a view for explaining the original shape before the extension seal portions 120D and 120E are compressed, and the two-dot chain line portions here are the outer ring 2 and the inner ring member. A part of 4 is shown.
The extension seal portions 120D and 120E are provided with the raised portion 15, the circumferential surface portion 16 and the like, similar to the extension seal portion 120 of the first embodiment. The dimensional relationship among the outer diameter D2 of the circumferential surface portion 16 of the extension seal portion 120D, the outer diameter D1 of the fitting surface 110c, and the outer diameter D3 of the top portion 15a is such that D1 <D2 <D3. This is the same as the extended seal portion 120.
The circumferential surface portion 16 of the extension seal portion 120E is continuous with the second inclined portion 15c, and the inner diameter D5 thereof is the inner diameter D4 of the fitting surface 131b with the inner ring member 4 in the fitting cylindrical portion 110 and the inner diameter of the top portion 15a. The size is between D6. That is, as is clear from the lower enlarged view of FIG. 4, the dimensional relationship among the inner diameter D5 of the circumferential surface portion 16, the inner diameter D4 of the fitting surface 131b, and the inner diameter D6 of the top portion 15a is D4>D5> D6.

  According to the above configuration, since the extension seal portions 120D and 120E also have a structure in which the inclination angle θ of the first inclined portion 15b of the raised portion 15 rises at a gentle angle of 5 ° to 30 °, the outer ring 2 and the inner ring When the seal member 10 </ b> A is fitted between the first and second seal members 15 </ b> A, the first inclined portion 15 b can be relieved of the resistance generated by contacting the inner diameter surface 2 b of the outer ring 2 or the outer diameter surface 4 a of the inner ring member 4. The same effect as the embodiment can be exhibited. Further, the metal bent portions 113 and 132 are arranged on the radially inner side or the radially outer side where the raised portions 15 and the circumferential surface portions 16 of the extended seal portions 120D and 120E are arranged. The exit seal portions 120D and E do not miss the force that pushes the inner diameter surface 2b of the outer ring 2 or the outer diameter surface 4a of the inner ring member 4, and airtightness of the seal portion can be ensured.

  A third inclined portion 23 that is inclined in the same direction as the second inclined portion 15c is formed on the rear side in the fitting direction A1 of the circumferential surface portion 16 of the extension seal portion 120D. Further, a third circumferential surface portion 24 parallel to the fitting surface 110c is formed on the rear side of the third inclined portion 23 in the fitting direction A1, and the third circumferential surface portion 24 is formed from the fitting surface 110c. Is formed so as not to protrude. Specifically, in the example of FIG. 4, the third circumferential surface portion 24 is formed from a middle position of the bent portion 113, and a step d <b> 3 is provided between the fitting surface 110 c and the third circumferential surface portion 24. Is formed. When the sealing member 10A is fitted to the inner diameter surface 2b of the outer ring 2, the step d3 becomes a refuge for the raised portion 15 and the circumferential surface portion 16 that are compressed by the inner diameter surface 2b, and an appropriate sealing stress is applied. Can be secured.

On the other hand, the second circumferential surface portion 17 is formed on the front side in the fitting direction A1 of the first inclined portion 15b of the extended seal portion 120E shown in FIG. 4 so as not to protrude to the inner diameter side from the fitting surface 131b. In addition, the second circumferential surface portion 17 is formed from the middle position of the bent portion 132.
By forming the extended seal portion 120E in this manner, a step d4 (see the lower enlarged view of FIG. 4) is formed between the fitting surface 131b and the second circumferential surface portion 17. Therefore, the fitting force can be satisfactorily maintained without the presence of the extended seal portion 120E affecting the fitting portion between the outer diameter surface 4a of the inner ring member 4 and the slinger cylindrical portion 131 of the slinger 13. Further, since the shear stress hardly acts on the extended seal portion 120E, the extended seal portion 120E can be hardly peeled off.

  The circumferential surface portion 16 of the extension seal portion 120E is a surface 16a parallel to the fitting surface 131b, and the inner diameter D5 is a size between the inner diameter D4 of the fitting surface 131b and the inner diameter D6 of the top portion 15a. Therefore, even if the compression reaction force of the raised portion 15 is increased and the sag of the extended seal portion 120E due to deterioration with time is generated, intrusion of dust, muddy water, and the like from the outside can be prevented. Therefore, it is possible to prevent rusting from occurring on the outer diameter surface 4 a of the inner ring member 4 and the fitting surface 131 b of the slinger cylindrical portion 131 of the slinger 13. Further, the sealing performance can be maintained against the internal pressure rise, and the sealing performance can be maintained for a long time.

  In the sealing member 10A shown in FIG. 4, the shapes and configurations of the extended seal portions 120D and 120E are not limited to the illustrated examples. For example, the extension seal portions 120D and 120E may not have the steps d3 and d4 like the extension seal portion 120F shown in FIG. Specifically, for example, the extension seal portion 120D may not have the third inclined portion 23 and the third circumferential surface portion 24, and the diameter of the third circumferential surface portion 24 is substantially the same as the fitting surface 110c. May be. Further, the extension seal portion 120 </ b> D may not include the third circumferential surface portion 24, and the third inclined portion 23 may be formed from a midway position of the bent portion 113. As the shape of the extended seal portion 120E, the shapes shown in FIG. 5, FIG. 6 (b), and FIG. 6 (c) described later can be applied.

Next, the sealing member 20 according to the third embodiment will be described with reference to FIG. The same reference numerals are given to the same parts as those in the above-described embodiment, and the description of the operation and effect is omitted.
FIG. 5 is an enlarged view of a Y portion in FIG. 1 and shows a wheel-side seal member 20. The seal member 20 is mounted between the outer ring 2 and the hub ring 3, and the opening 2 c of the annular space S is sealed by the seal member 20.
The seal member 20 includes a cored bar 21 fitted into the outer ring 2 and a rubber elastic member 22 fixed to the cored bar 21.

  The core metal 21 includes a fitting cylindrical portion 210 that is fitted inside the inner diameter surface 2 b of the outer ring 2, and a bent portion 211 that is bent obliquely in the radial direction from one end portion 210 a on the hub flange 32 side of the fitting cylindrical portion 210. And an inward flange portion 212 that is coupled to the one end portion 211a of the bent portion 211 and extends in the inner diameter direction. When the sealing member 20 is assembled between the outer ring 2 and the hub ring 3, the bent portion 211 is configured such that the extended seal portion 120 </ b> F that covers the bent portion 211 comes into contact with the inner diameter surface 2 b of the outer ring 2 and against the outer ring 2. And is formed to have a gap in the radial direction. The inclination angle of the bent portion 211 is not particularly limited, but is about 20 ° to 50 °.

The elastic member 22 is made of a rubber material selected from NBR, H-NBR, ACM, AEM, FKM, and the like, and is integrally fixed to the core metal 21 by vulcanization molding. The elastic member 22 includes an extended seal portion 120F, a seal lip base portion 220, side lips 221, 222, and a radial lip 223.
The extension seal portion 120 </ b> F covers the hub flange 32 side of the bent portion 113, and is formed so as to be interposed between the bent portion 113 and the outer ring 2 in a compressed state.

  The seal lip base 220 covers a surface 212 a on the hub flange 32 side of the inward flange portion 212 of the core metal 11. It is formed to extend toward the rising base 31 and the hub wheel main body 30. Specifically, the side lip 221 is formed to be in direct contact with the hub flange 32, the side lip 222 is in direct contact with the rising base 31, and the radial lip 223 is in direct contact with the hub wheel body 30.

The configuration of the seal member 20 is not limited to this, and may be configured to be used in combination with a hub slinger (not shown) having a curved shape or a tapered shape that matches the shape of the rising base portion 31, for example. The hub slinger is formed by pressing and bending a steel plate such as stainless steel or SPCC, and the side lips 221 and 222 and the radial lip 223 are formed so as to be in sliding contact with the hub slinger elastically.
In FIG. 5, the two-dot chain line portions of the side lips 221 and 222 and the radial lip 223 show the original shape before elastic deformation.

The enlarged view shown in FIG. 5 shows the extended seal portion 120F fixed to the bent portion 211. FIG. 5 is a view for explaining the original shape before the extension seal part 120F is compressed, and the two-dot chain line part here shows a part of the outer ring 2. FIG.
The extending seal portion 120F has a raised portion 15 formed in a mountain shape in a cross-sectional view along the axis L direction, and a circumferential surface portion 16 parallel to the fitting surface 210b for the outer ring 2 in the fitting cylindrical portion 210. ing. The raised portion 15 is the most protruding top portion 15a, the first inclined portion 15b that is located on the front side in the fitting direction A2 with respect to the outer ring 2 across the top portion 15a, and whose inclination angle θ is 5 ° to 30 °, It has the 2nd inclination part 15c located in the back side of fitting direction A2 on both sides of the top part 15a.

  The circumferential surface portion 16 of the extension seal portion 120F is continuous with the second inclined portion 15c, and the outer diameter D8 thereof is the outer diameter D7 of the fitting surface 210b with the outer ring 2 in the fitting cylindrical portion 210, and the top portion 15a. The size is between the outer diameter D9. That is, as apparent from the enlarged view of FIG. 5, the dimensional relationship among the outer diameter D8 of the circumferential surface portion 16, the outer diameter D7 of the fitting surface 210b, and the outer diameter D9 of the top portion 15a is D7 <D8 <D9. The

  According to the above configuration, the extended seal portion 120F of the seal member 20 shown in FIG. 5 has the same effect as the extended seal portion 120 of the first embodiment. That is, the extended seal portion 120F of the seal member 20 has a structure in which the inclination angle θ of the first inclined portion 15b of the raised portion 15 rises at a gentle angle of 5 ° to 30 °. When the seal member 20 is fitted between the first inclined portion 15b and the first inclined portion 15b, the resistance generated by contacting the inner diameter surface 2b of the outer ring 2 can be reduced. Further, since the bent portion 211 made of metal is arranged on the radially inner side of the extended seal portion 120F where the raised portion 15 and the circumferential surface portion 16 are arranged, the extended seal portion 120F is connected to the outer ring 2. The force that pushes the inner diameter surface 2b is not missed, and the airtightness of the seal portion can be ensured.

A second circumferential surface portion 17 parallel to the fitting surface 210b is formed on the front side of the first inclined portion 15b of the sealing member 20 shown in FIG. 5 in the fitting direction A2, and this second circumferential surface portion 17 is formed. Is formed so as not to protrude to the outer diameter side from the fitting surface 210b. Specifically, the outer diameter D7 of the fitting surface 210b and the outer diameter of the second circumferential surface portion 17 are formed to be substantially the same, and the flat surface is continuous with the fitting surface 210b.
Therefore, when the cored bar 21 is pushed in with the jig toward the fitting direction A2 so that the fitting cylindrical portion 210 is fitted to the inner diameter surface 2b of the outer ring 2, the second circumferential surface portion of the extension seal portion 120F. 17 is formed so as not to protrude from the fitting surface 210b to the outer diameter side, so that the metal fitting between the outer ring 2 and the fitting cylindrical portion 210 of the core metal 21 is not affected.

Further, the seal member 20 shown in FIG. 5 is formed with a third inclined portion 18 that is inclined in the same direction as the second inclined portion 15c on the rear side of the circumferential surface portion 16 in the fitting direction A2.
By forming the third inclined portion 18 in this way, it becomes a refuge for the raised portion 15 and the circumferential surface portion 16 that are compressed by the inner diameter surface 2b, and an appropriate seal stress can be secured.

Next, a modified example of the sealing member 20 will be described with reference to FIGS.
6A to 6C are explanatory views corresponding to an enlarged view of the Y1 portion of FIG. 5, and the extended seal portions 120G to 120I shown here are deformations of the extended seal portion 120F shown in FIG. It is an example. The seal member 20 shown in FIGS. 6A to 6C is different from the seal member 10 shown in FIGS. 3A to 3C in the shape of the core metal, but the basic shape of the extended seal portions 120G to 120I. Is common to the extension seal portions 120A to 120C. In FIG. 6, the two-dot chain line portion indicates the outer shape of the outer ring 2, and the position of the line on the lower side of the two-dot chain line portion is that the extended seal portions 120 </ b> G to 120 </ b> I are compressed when the seal member 20 is attached. Indicates the position. In addition, although illustration about the dimensional relationship of the outer diameter D7 of the fitting surface 210b of the extension seal | sticker parts 120G-120I, the outer diameter D8 of the circumferential surface part 16, and the outer diameter D9 of the top part 15a is abbreviate | omitted, these The dimensional relationship of D7 <D8 <D9 is the same as that of the extended seal portion 120F.

First, the example shown in FIG. 6A is an example having a basic shape similar to the extended seal portion 120E shown in FIG. The second circumferential surface portion 17 of the extending seal portion 120G is formed so as not to protrude to the outer diameter side from the fitting surface 210b, and the second circumferential surface portion 17 is formed from a midway position of the bent portion 211. Yes.
By forming the extended seal portion 120G in this way, a step d5 (see FIG. 6A) is formed in the radial direction from the fitting surface 210b. Therefore, the fitting force can be satisfactorily maintained without the presence of the extended seal portion 120 </ b> G affecting the fitting portion between the inner diameter surface 2 b of the outer ring 2 and the fitting cylindrical portion 210 of the core metal 21. Further, since the shearing stress is unlikely to act on the extended seal portion 120G, the extended seal portion 120G can be hardly peeled off.

In the example shown in FIG. 6B, the second circumferential surface portion 17 is not provided, but the first inclined portion 15 b is formed from the middle position of the bent portion 211.
In this example, a step d6 similar to the example of FIG. 6A is formed. In this case as well, the fitting force is not affected by the presence of the extended seal portion 120H at the fitting portion between the inner diameter surface 2b of the outer ring 2 and the fitting cylindrical portion 210 of the core metal 21 as in the example of FIG. Can be held well. Further, since the shear stress hardly acts on the extended seal portion 120H, the extended seal portion 120H can be hardly peeled off.
Also, if the dimensions of the steps d5 and d6 are about the compression allowance after the seal member 20 is mounted as shown in the figure, it becomes a refuge for the raised portion 15 that is compressed by the inner diameter surface 2b, and ensures an appropriate seal stress. be able to.

The example shown in FIG. 6C is an example in which the extended seal portion 120 does not have the second circumferential surface portion 17 and the steps d5 and d6 as shown in FIGS. 3A and 3B.
In this example, the first inclined portion 15 b is formed from the corner end portion 211 b (between the fitting surface 210 b and the bent portion 211) of the bent portion 211. Also in this case, the inclination angle θ of the first inclined portion 15b of the raised portion 15 has a structure that rises at a gentle angle of 5 ° to 30 °, and exhibits the same effect as the example of the third embodiment shown in FIG. .

Next, a seal member 20A according to the fourth embodiment will be described with reference to FIG. The same reference numerals are given to the same parts as those in the above-described embodiment, and the description of the operation and effect is omitted.
The seal member 20A of the fourth embodiment is the same as the seal member 20 of the third embodiment in that it is a seal member that is attached to the opening 2c on the wheel side. Is different in that it is fitted to the outer diameter surface 2d of the outer ring 2. Another difference is that a thin portion 213 is formed on the cored bar 21.

  The cored bar 21 is formed to be thinner than the other parts at the fitting cylindrical part 214 fitted on the outer diameter surface 2d of the outer ring 2 and the one end 214a on the vehicle body side in the axis L direction of the fitting cylindrical part 214. A thin-walled portion 213 and an inward flange portion 212 that is continuous with the other end portion 214b of the fitting cylindrical portion 214 on the hub flange 32 side (wheel side) and extends in the inner diameter direction.

The elastic member 22 includes an extension seal portion 120J, a seal lip base portion 220, a side lip 221 and the like. The extension seal portion 120J covers the thin portion 213 of the core metal 21, and the thin portion 213 and the outer ring 2 It is formed so as to be interposed in a compressed state.
The seal lip base 220 covers the surface 212a on the hub flange 32 side of the inward flange portion 212 of the core metal 21, and the side lip 221 and the like extend from the seal lip base 220 toward the hub flange 32.
7A, illustration of the side lip 222, the radial lip 223, and the like shown in FIG. 5 is omitted, but the same configuration as that of FIG.

  The core bar 21 of the seal member 20A shown in FIG. 7A is different in the shape of the core bar 11 of the seal member 10A of FIG. 4, but the basic shape of the extended seal part 120J is the third inclined part 23 and the third circle. It is common with the extended seal part 120D in that the peripheral surface part 24 is provided. In the figure, 213a indicates the inner peripheral surface of the thin portion 213, 213b indicates a step portion, and 213c indicates an end portion of the thin portion 213. The inner peripheral surface 213a is a surface parallel to the fitting surface 214c of the fitting cylindrical portion 214, and the step portion 213b is an inclined surface inclined in the same direction as the first inclined portion 15b. The end portion 213c is covered with the elastic member 22 so that the cored bar 21 is not exposed, and the occurrence of rust can be suppressed even when an attack such as muddy water is received.

  The extended seal portion 120J includes a raised portion 15 formed in a mountain shape in a cross-sectional view along the axis L direction, and a circumferential surface portion 16 parallel to the fitting surface 214c for the outer ring 2 in the fitting cylindrical portion 214. ing. The raised portion 15 is the most protruding top portion 15a, the first inclined portion 15b that is located on the front side in the fitting direction A2 with respect to the outer ring 2 across the top portion 15a, and whose inclination angle θ is 5 ° to 30 °, It has the 2nd inclination part 15c located in the back side of fitting direction A2 on both sides of the top part 15a. The circumferential surface portion 16 of the extension seal portion 120J is continuous with the second inclined portion 15c, and the inner diameter D11 thereof is the inner diameter D10 of the fitting surface 214c with the outer ring 2 in the fitting cylindrical portion 214 and the inner diameter D12 of the top portion 15a. The size is between. That is, as is clear from FIG. 7A, the dimensional relationship among the inner diameter D11 of the circumferential surface portion 16, the inner diameter D10 of the fitting surface 214c, and the inner diameter D12 of the top portion 15a is D10> D11> D12.

  According to the above configuration, the extending seal portion 120J has a structure in which the inclination angle θ of the first inclined portion 15b of the raised portion 15 rises at a gentle angle of 5 ° to 30 °. When the fitting cylindrical portion 214 is fitted to 2d, the resistance generated by the first inclined portion 15b coming into contact with the outer diameter surface 2d of the outer ring 2 can be reduced. Therefore, it is possible to prevent damage such as cutting of the rising portion of the first inclined portion 15b and generation of scratches.

In addition, since the raised portion 15 of the extended seal portion 120J shown in FIG. 7A has a mountain shape and a top portion 15a, when the fitting cylindrical portion 214 is fitted to the outer ring 2, the top portion 15 15a is in a state where it is in line contact with the outer diameter surface 2d of the outer ring 2 and is compressed, and the compression reaction force closely adheres to the outer diameter surface 2d and can improve the sealing performance.
Further, a third inclined portion 23 that is inclined in the same direction as the second inclined portion 15c is formed on the rear side in the fitting direction A2 of the circumferential surface portion 16 of the extended seal portion 120J. Further, a third circumferential surface portion 24 parallel to the fitting surface 214c is formed on the rear side of the third inclined portion 23 in the fitting direction A2, and the third circumferential surface portion 24 is formed from the fitting surface 214c. Is also formed so as not to protrude toward the inner diameter side. Specifically, the third circumferential surface portion 24 is formed from the middle position of the step portion 213b. In FIG. 7A, the raised portion 15 and the circumferential surface portion 16 are compressed to fill the step. In the original shape before the extension seal portion 120J is compressed, there is a step (the two-dot chain line portion in FIG. 7A) between the inner diameter D12 of the fitting surface 214c and the diameter of the third circumferential surface portion 24. Reference) is formed. When the seal member 20A is fitted to the outer diameter surface 2d of the outer ring 2, this step becomes a refuge for the raised portion 15 and the circumferential surface portion 16 that are compressed by the outer diameter surface 2d, and ensures an appropriate seal stress. can do. Further, since the thin metal portion 213 is disposed on the radially outer side where the top portion 15a, the circumferential surface portion 16 and the like of the extension seal portion 120J are arranged, the extension seal portion 120J has the outer diameter of the outer ring 2. The force of pushing the surface 2d is not missed, and the airtightness of the seal member can be ensured.
Note that the shape and configuration of the extended seal portion 120J in FIG. 7A are not limited to the illustrated example. For example, there may not be a level | step difference like the extension seal | sticker part 120 shown in FIG. Specifically, for example, the extension seal portion 120J may not have the third inclined portion 23 and the third circumferential surface portion 24, and the diameter of the third circumferential surface portion 24 is substantially equal to the inner diameter D12 of the fitting surface 214c. It may be the same. Further, the third circumferential surface portion 24 may not be provided, and the third inclined portion 23 may be formed from a midway position of the step portion 213b.

Next, a modified example of the seal member 20A according to the fourth embodiment will be described with reference to FIG. The same reference numerals are given to the same parts as those in the above-described embodiment, and the description of the operation and effect is omitted. In addition, although illustration about the dimensional relationship of the internal diameter D12 of the fitting surface 214c of the extension seal | sticker part 120K, the internal diameter D11 of the circumferential surface part 16, and the internal diameter D10 of the top part 15a is abbreviate | omitted, these dimensional relations are D10. The point of <D11 <D12 is the same as that of the extended seal portion 120J.
The seal member 20A ′ shown in FIG. 7B is different in that the core 21 is provided with a bent portion 215 instead of the thin portion 213, but the basic shape of the extended seal portion 120K is as shown in FIG. The same as the extended seal portion 120J of a).
The core metal 21 is formed to be bent obliquely in the outer diameter direction from the fitting cylindrical portion 214 fitted into the outer diameter surface 2d of the outer ring 2 and the one end portion 214a on the vehicle body side in the axis L direction of the fitting cylindrical portion 214. The bent portion 215, the outward standing plate portion 216 extending further outward in the radial direction from the bent portion 215, and the other end portion 214 b on the hub flange 32 side (wheel side) of the fitting cylindrical portion 214 are coupled in the inner diameter direction. And an inward eaves part 212 formed to extend.

The elastic member 22 includes an extended seal portion 120K, a seal lip base portion 220, a side lip 221 and the like. The extended seal portion 120K covers the outer ring 2 side of the bent portion 215, and the bent portion 215 and the outer ring 2 are covered. Between the two in a compressed state.
The seal lip base 220 covers the end 216a of the outwardly standing plate portion 216 of the core metal 21 and the surface 212a of the inward flange portion 212 on the hub flange 32 side, and the side lip 221 and the like from the seal lip base 220 to the hub flange 32. It is formed to extend toward.
In the example shown in FIG. 7B, the cored bar 21 includes a bent portion 215 and an outwardly standing plate portion 216, which is covered with the elastic member 22 so that the outwardly standing plate portion 216 is not exposed, and the extended seal portion 120K is formed. Since it has the thick wall part 25 which consists of the elastic member 22 so that it may interpose in the compression state between the bending part 215 and the outer ring | wheel 2, even if it receives attacks, such as muddy water, mud water etc. are received by the thick wall part 25. Can be bounced back.

  In FIG. 7B, the illustration of the side lip 222, the radial lip 223, and the like shown in FIG. 5 is omitted, but the same configuration as in FIG. Further, the shape and configuration of the extended seal portion 120K are not limited to the illustrated example. There may not be a level | step difference like the extension seal | sticker part 120 shown in FIG. Specifically, for example, the extension seal portion 120K may not have the third inclined portion 23 and the third circumferential surface portion 24, and the diameter of the third circumferential surface portion 24 is the inner diameter (D12) of the fitting surface 214c. May be substantially the same. Alternatively, the third circumferential surface portion 24 may not be provided, and the third inclined portion 23 may be formed from the middle position of the bent portion 215.

As described above, in the embodiment, the example in which the seal member according to the present embodiment is applied to a bearing device for an automobile has been described. However, the present invention is not limited thereto, and the inner member is supported so as to be axially rotatable with respect to the outer member. As long as the seal member is mounted between the two members, it is preferably applied to bearing devices in other industrial fields. In particular, the seal member of the present embodiment can be applied as a protective cover shown in Patent Document 4 and FIG. 4, that is, a cap seal, and the shape and configuration of the extended seal portion are the same between the cap seal and the outer member. It can employ | adopt suitably for a fitting surface. Therefore, even when applied to a cap seal, it is possible to prevent damage such as cutting of the rising part of the extended seal part or generation of scratches, increasing the compression reaction force of the raised part, and further, Even if sag occurs, it is possible to prevent the entry of dust, muddy water, etc. from the outside, so that it is possible to prevent rust from occurring at the metal fitting site. Further, the sealing performance can be maintained against the internal pressure rise, and the sealing performance can be maintained for a long time.
Further, the bearing device is not limited to the bearing device shown in FIG. Further, the shapes of the cored bar and the elastic member fixed to the cored bar are not limited to the illustrated examples, and the fitting form of the cored bar and the outer ring is not limited to the illustrated examples. Further, the shape of the side lip and the radial lip can be appropriately changed according to the required specifications.

2 Outer ring (outer member)
S annular space 2a, 2c opening 5 inner ring (inner member)
10, 10A, 20, 20A, 20A 'Seal member 11, 21 Core metal 110, 210, 214 Fitting cylindrical portion 110a One end portion 110c, 131b, 210b, 214c Fitting surface 111, 213 Thin portion 113, 132, 211, 215 Bent part 120, 120A-120K Extension seal part 12, 22 Elastic member L axis 15 Raised part 15a Top part 15b First inclined part 15c Second inclined part 16 Circumferential surface part D1-D12 Diameter 17 Second peripheral surface part 18 , 23 Third inclined portion 24 Third circumferential surface portion 111b, 213b Stepped portions A1, A2 Fitting direction θ Inclination angle

Claims (7)

A seal member for sealing an opening of an annular space formed between an outer member and an inner member that rotate relatively coaxially,
A fitting cylindrical portion that is fitted and attached to either one of the outer member and the inner member, and a thin wall formed at one end in the axial direction of the fitting cylindrical portion to be thinner than other portions A mandrel having a portion;
An elastic member having an extension seal portion fixed to the cored bar, covering the thin portion and formed so as to be interposed in a compressed state between the thin portion and the one member,
The extending seal portion has a raised portion formed in a mountain shape in a cross-sectional view along the axial direction, and a circumferential surface portion parallel to the fitting surface for the one member in the fitting cylindrical portion. ,
The raised portion includes a most protruding top portion, a first inclined portion that is positioned on the front side in the fitting direction with respect to the one member across the top portion, and an inclination angle of 5 ° to 30 °, and the top portion. A second inclined portion located on the rear side in the fitting direction with the sandwiched therebetween,
The circumferential surface portion is continuous with the second inclined portion, and a diameter thereof is a size between a diameter of a fitting surface with the one member in the fitting cylindrical portion and a diameter of the top portion. The sealing member characterized by the above-mentioned. A seal member for sealing an opening of an annular space formed between an outer member and an inner member that rotate relatively coaxially,
A fitting cylindrical portion that is fitted to and mounted on any one of the outer member and the inner member, a bent portion that is bent obliquely in a radial direction from one end of the fitting cylindrical portion, A cored bar having a collar portion coupled to one end of the bent portion and extending in the radial direction;
An elastic member having an extended seal portion fixed to the cored bar, covering the bent portion and formed so as to be interposed in a compressed state between the bent portion and the one member;
The extending seal portion has a raised portion formed in a mountain shape in a cross-sectional view along the axial direction, and a circumferential surface portion parallel to the fitting surface for the one member in the fitting cylindrical portion. ,
The raised portion includes a most protruding top portion, a first inclined portion that is positioned on the front side in the fitting direction with respect to the one member across the top portion, and an inclination angle of 5 ° to 30 °, and the top portion. A second inclined portion located on the rear side in the fitting direction with the sandwiched therebetween,
The circumferential surface portion is continuous with the second inclined portion, and a diameter thereof is a size between a diameter of a fitting surface with the one member in the fitting cylindrical portion and a diameter of the top portion. The sealing member characterized by the above-mentioned. In claim 1 or claim 2,
A second circumferential surface portion parallel to the fitting surface is formed on the front side in the fitting direction of the first inclined portion,
The second circumferential surface portion is formed so as not to protrude from the fitting surface. In any one of Claims 1-3,
A sealing member, wherein a third inclined portion that is inclined in the same direction as the second inclined portion is formed on the rear side of the circumferential surface portion in the fitting direction. In claim 4,
A third circumferential surface portion parallel to the fitting surface is formed on the rear side in the fitting direction of the third inclined portion,
The third circumferential surface portion is formed so as not to protrude from the front fitting surface. In claim 1,
The thin portion is formed to have a gap in the radial direction with respect to the one member,
The step portion between the thin wall portion and the fitting cylindrical portion is formed to be inclined,
The extending seal portion is formed at a midway position of the stepped portion. In claim 2,
The extending seal portion is formed from a midway position of the bent portion.

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