JP2010265969A - Contact seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact seal suppressing reduction of sealability while preventing generation of a seal sucking phenomenon and free from strict control of dimension of notches. <P>SOLUTION: The contact seal 11 is mounted to an outer member OP positioned and rotated radially outside of an outer peripheral surface of an inner member IP for sealing a circular opening A in between. The contact seal is composed of a circular core metal 12 coated with an elastic element 13, and inner/outer peripheral end parts of the elastic element 13 are made to be a seal lip 14 and an outer diameter mounting part 15. A notch 17A which communicates with inside/outside in the axial direction is formed on an outer peripheral surface of the outer diameter mounting part 15. A notch 17B which does not communicates with inside/outside in the radial direction and which extends from a radial inner surface to a radial inner end part of an outer diameter side blocking part 18 is formed on an axial inner surface of the outer diameter mounting part 15. In a state of a sealed part receives negative pressure and inner diameter sides of the core metal 12 and the elastic element 13 inclined to move to the axial inside, the blocking part 18 is separated from a sidewall surface 7A extending to the radial direction of the outer member OP. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is attached to an outer member that rotates and is positioned radially outward from the outer peripheral surface of the inner member, and covers an annular opening between the inner member and the outer member. The inner peripheral side end of the elastic body is used as a seal lip, and the seal lip is in contact with the inner member, or attached to the inner member that rotates in the radial direction from the inner peripheral surface of the outer member, A contact seal having a structure in which the annular opening between the outer member and the inner member is closed, the annular cored bar is covered with an elastic body, the outer peripheral end of the elastic body is used as a seal lip, and the seal lip contacts the outer member It is about.

For example, an auxiliary machine around an engine such as an alternator of an automobile and an air conditioner is driven by a timing belt connected to an engine crank, and a tension pulley and an idler pulley are provided to freely adjust the tension and layout of the timing belt. used.
These pulley rolling bearings are required to have high sealing performance that can prevent foreign matter such as muddy water or dust from entering between the outer ring and the inner ring of the bearing in consideration of rain or bad roads. A contact seal having a structure in which an annular metal core is covered with an elastic body such as a synthetic rubber, an inner peripheral side end portion of the elastic body is used as a seal lip, and the seal lip is brought into contact with the inner ring.
In such contact seals, when the temperature-increased bearing is cooled, the sealed portion (inside the bearing) becomes negative pressure, and a seal adsorption phenomenon occurs in which the seal lip is pressed against the seal groove of the inner ring. In order to solve this problem, there is a problem in that the outer surface of the contact seal is removed. There is one in which a notch (slit, air hole) is formed in the diameter mounting portion so that the inside and outside of the seal (inside and outside of the bearing) communicate with each other (for example, see Patent Documents 1 and 2).

Japanese Utility Model Publication No. 6-48186 JP 2000-65074 A

According to the contact seal in which the inside and outside of the seal are communicated as in Patent Documents 1 and 2, the pressure inside and outside the seal (inside and outside the bearing) can be balanced, so that the occurrence of a seal adsorption phenomenon can be prevented.
However, because the notch is formed in the outer diameter mounting part and the inside and outside of the seal are always in communication, the sealing performance may deteriorate and the required sealing performance may not be ensured. Since it is directly connected to the strict size control, strict dimensional control is required, which increases the manufacturing cost.

  Accordingly, in view of the above-described situation, the present invention intends to solve the problem that it is possible to prevent the occurrence of the seal adsorption phenomenon while suppressing the deterioration of the sealing performance, and it is not necessary to strictly manage the notch dimensions. It is in providing a contact seal.

  In order to solve the above problems, the contact seal according to the present invention is attached to an outer member that is positioned radially outside the outer peripheral surface of the inner member, and closes an annular opening between the inner member and the outer member. A contact seal in which an annular core is covered with an elastic body and inner and outer peripheral side ends of the elastic body are used as a seal lip and an outer diameter mounting portion, and communicates with the outer peripheral surface of the outer diameter mounting portion in the axial direction inside and outside. A notch that does not communicate with the radially inner and outer ends extending from the radially inner side surface of the outer diameter side blocking portion to the radially inner end portion is formed on the inner surface in the axial direction of the outer diameter mounting portion. In a state where the seal portion is negative pressure and the inner diameter side of the core metal and the elastic body is inclined so as to move inward in the axial direction, the blocking portion is separated from the side wall surface extending in the radial direction of the outer member.

  Further, in order to solve the above problems, the contact seal according to the present invention is attached to an outer member that is positioned radially outside the outer peripheral surface of the inner member and rotates, and an annular opening between the inner member and the outer member is provided. A contact seal that covers an annular cored bar with an elastic body and has inner and outer peripheral side end portions of the elastic body as a seal lip and an outer diameter mounting portion. A notch communicating with the outer diameter mounting portion is formed on the inner surface in the axial direction of the outer diameter mounting portion, and a radially outer surface of the inner diameter side blocking portion is formed on the outer surface in the axial direction of the outer diameter mounting portion. A notch that does not communicate with the radially inner and outer ends extending from the radially outer end to the radially outer end, and the sealed portion is in a negative pressure so that the inner diameter side of the metal core and the elastic body moves inward in the axial direction Then, the blocking part presses the side surface of the outer member. It is intended to separate from the inner surface extending in the radial direction of the pressing member.

  Furthermore, in order to solve the above problems, the contact seal according to the present invention is attached to an inner member that rotates at a position radially inward of the inner peripheral surface of the outer member, and an annular opening between the outer member and the inner member. A contact seal in which an annular core is covered with an elastic body and an outer inner peripheral end of the elastic body is used as a seal lip and an inner diameter mounting portion, and the inner peripheral surface of the inner diameter mounting portion is axially Forming a notch communicating with the inside and outside, and forming a notch that does not communicate with the radially inner and outer ends extending from the radially outer surface of the inner diameter side blocking portion to the radially outer end, on the inner surface in the axial direction of the inner diameter mounting portion, In a state where the sealed portion is under negative pressure and the outer diameter side of the core metal and the elastic body is inclined so as to move inward in the axial direction, the blocking portion is separated from the side wall surface extending in the radial direction of the inner member. is there.

  Furthermore, the contact seal according to the present invention is attached to an inner member that rotates and is positioned radially inward of the inner peripheral surface of the outer member, and an annular shape between the outer member and the inner member is provided to solve the above-described problem. A contact seal that closes an opening and covers an annular core with an elastic body and uses an outer inner peripheral end of the elastic body as a seal lip and an inner diameter mounting portion. Forming a notch communicating inward and outward in the direction, forming a notch communicating inward and outward in the radial direction on the inner surface in the axial direction of the inner diameter mounting portion, and radially inward of the outer diameter side blocking portion on the outer surface in the axial direction of the inner diameter mounting portion. A notch that does not communicate with the inside and outside in the radial direction extending from the side surface to the inside end in the radial direction is formed, and the sealed portion is inclined so that the outer diameter side of the cored bar and the elastic body moves inward in the axial direction due to negative pressure. In this state, the blocking portion pushes the side surface of the inner member. It is intended to separate from the inner surface extending in the radial direction of obtaining pressing member.

According to the contact seal according to the present invention, when the sealed portion becomes negative pressure, the inside and outside of the seal communicate with each other, and the pressure inside and outside the seal can be instantly balanced. In addition, since the inside and outside of the seal do not communicate in a state where the pressure inside and outside the seal is balanced, the sealing performance does not deteriorate even if the notch is formed.
In addition, since the inside and outside of the seal do not communicate under normal operating conditions in which the pressure inside and outside the seal is balanced, a notch is used to prevent deterioration of the sealing performance as with a conventional contact seal that communicates between the inside and outside of the seal. Since it is not necessary to strictly manage the dimensions, an increase in manufacturing cost can be suppressed.

It is sectional drawing of the rolling bearing equipped with the contact seal which concerns on Embodiment 1 of this invention, and has shown the state where the pressure inside and outside a seal is balanced. Similarly, it is sectional drawing which expands and shows a principal part, (a) shows the state where the pressure inside and outside the seal is balanced, and (b) shows the moment when the sealed part becomes negative pressure. It is sectional drawing of a contact seal, (a) is a cross section from an outer diameter mounting part to a seal lip, (b) is an A1 cross section of (a), (c) is an A2 cross section of (a). Show. It is sectional drawing of the rolling bearing which mounted | wore with the contact seal which concerns on Embodiment 2 of this invention, and has shown the state where the pressure inside and outside a seal is balanced. Similarly, it is sectional drawing which expands and shows a principal part, (a) shows the state where the pressure inside and outside the seal is balanced, and (b) shows the moment when the sealed part becomes negative pressure. It is sectional drawing of a contact seal, (a) is a cross section from an outer diameter mounting part to a seal lip, (b) is an arrow B1 section of (a), (c) is an arrow B2 section of (a). (D) has shown the B3 cross section of (a). It is sectional drawing of the one-way clutch equipped with the contact seal which concerns on Embodiment 2 of this invention, (a) is the state where the pressure inside and outside a seal is balanced, (b) is a to-be-sealed part negative pressure. Shows the moment.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste. In the following, the axial direction of the rotating shaft is referred to as “axial direction”, and the rotational radial direction is referred to as “radial direction”. In addition, in the cross-sectional views of FIGS. 1 to 7, in consideration of the visibility of these drawings, a part of the external line that is visible on the side opposite to the cut end face is omitted, and a part is shown as a cut end face view.

Embodiment 1 FIG.
1 and 2 show a rolling bearing 1 equipped with a contact seal 11 according to Embodiment 1 of the present invention. The rolling bearing 1 includes an inner ring 2 that is an inner member IP and an outer ring 3 that is an outer member OP. However, it rotates relatively through the rolling elements 5 held by the cage 4, and grease 10 is sealed between the inner ring 2 and the outer ring 3 as a lubricant, and the rolling elements 5,. On the left and right sides in the bearing width direction, contact seals 11, 11 having a substantially annular shape when viewed from the front are attached to close the annular openings A, A between the inner ring 2 and the outer ring 3.

As shown in FIGS. 2 and 3, the contact seal 11 covers the elastic body 13 such as synthetic rubber by vulcanization adhesion continuously to the outer peripheral portion and inner peripheral portion of the annular metal core 12 made of a steel plate or the like. The inner end of the elastic body 13 is a seal lip 14, and the outer end is an outer diameter mounting portion 15. The seal lip 14 is inserted into a circumferential groove 6 formed on the outer peripheral surface of the inner ring 2. And the seal lip 14 is pressed against the side wall surface 8 extending in the radial direction of the inner ring 2 to prevent the grease 10 filled in the bearing 1 from leaking and foreign matter from the outside. Can be prevented.
Further, by fitting the outer diameter mounting portion 15 in the circumferential groove 7 formed on the inner peripheral surface of the outer ring 3, the contact seal 11 is positioned and fixed with respect to the bearing 1, and from the outer diameter portion of the seal 11. Intrusion of foreign matter can be prevented.

Here, as the rubber material used as the elastic body 13, as a rubber material having good oil resistance, nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), ethylene / acrylic rubber (AEM) One or two or more kinds of rubbers such as fluorine rubber (FKM, FPM) and silicone rubber (VQM) can be appropriately blended and used.
In consideration of kneadability of rubber materials, vulcanization moldability, and adhesion to metal plates, other types of rubber such as liquid NBR, ethylene propylene rubber (EPDM), natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), butadiene rubber (BR) and the like are also used preferably.

  As shown in FIG. 2A, in the state where the contact seal 11 is attached to the outer ring 3, the seal lip 14 is pressed against the inner ring 2 (side wall surface 8) as described above. Since the constricted portion 16 is formed between the inner peripheral surface 12A and the seal lip 14, even if the seal lip 14 is pressed against the inner ring 2, the constricted portion 16 having low rigidity is mainly deformed, and the constricted portion 16 Absorbs errors due to the shape accuracy of each part such as the inner ring 2 and the outer ring 3 and improves the followability to the inner ring 2, so that a stable and reliable contact seal can be formed and the rotational torque is increased. Can be suppressed.

As shown in FIG. 3, the outer diameter mounting portion 15 of the contact seal 11 has, for example, two notches 17A and 17A formed on the outer peripheral surface thereof at an equal angle of 180 °, and the axial inner surface (bottom surface) For example, one notch 17B is formed.
Here, the notch 17A communicates with the inside and outside in the axial direction, but the notch 17B does not communicate with the inside and outside in the radial direction.
That is, the notch 17B is not formed over the entire radial direction of the inner surface in the axial direction of the outer diameter mounting portion 15, leaving the blocking portion 18 on the outer peripheral side, and from the radially inner side surface of the blocking portion 18 to the radially inner end. It extends to the part.
Therefore, in the state where the pressure inside and outside the seal (inside and outside the bearing) shown in FIGS. 1 and 2A is balanced, the inner surface in the axial direction of the portion where the notch 17B of the outer diameter mounting portion 15 is not formed and the blocking portion 18. In this state, the inside and outside of the seal are not communicated with each other, so that the notch 17A, Even if 17B is formed, the sealing performance does not deteriorate.

From the state where the pressure inside and outside the seal (inside and outside the bearing) shown in FIGS. 1 and 2 (a) is balanced, when the bearing 1 whose temperature has risen is cooled and the inside of the bearing becomes negative pressure, as shown in FIG. 2 (b). The seal lip 14 is pressed against the inner ring 2 (side wall surface 8), and as a result, the contact seal 11 is tilted so that the inner diameter side of the cored bar 12 and the elastic body 13 is moved inward in the axial direction. Since the contact surface 18A is separated from the side wall surface 7A of the outer ring 3, the inside and outside of the seal communicate with each other by the notches 17A and 17B formed in the outer diameter mounting portion 15, and the pressure inside and outside the seal can be instantaneously balanced. Therefore, since the contact seal 11 instantaneously returns to the state shown in FIGS. 1 and 2A, the occurrence of the sticking phenomenon can be prevented.
Further, in the state where the contact seal 11 has returned to the state shown in FIG. 1 and FIG. 2A as described above, the inside and outside of the seal do not communicate with each other, so that the sealing performance does not deteriorate.

Embodiment 2. FIG.
4 and 5 show a rolling bearing 1 equipped with a contact seal 11 according to Embodiment 2 of the present invention. The same reference numerals as those in FIGS. 1 and 2 of Embodiment 1 denote the same or corresponding parts. Yes.
As shown in FIGS. 4 and 5, in the rolling bearing 1, the outer diameter mounting portion 15 of the contact seal 11 has a radially extending side wall surface 9 </ b> A and an axially extending inner peripheral surface 9 </ b> B. The outer surface (surface) in the axial direction of the outer diameter mounting portion 15 is pressed by an annular pressing member 9C in a state of being fitted to the step portion formed by the above.

As shown in FIG. 6, the outer diameter mounting portion 15 of the contact seal 11 has, for example, two cutouts 19 </ b> A and 19 </ b> A that are equally divided by 180 ° on the outer surface (surface) in the axial direction. For example, one notch 19B is formed, and two notches 19C and 19C are formed, for example, at 180 ° equally on the inner surface (bottom surface) in the axial direction.
Here, the notch 19B communicates with the inside and outside in the axial direction, and the notch 19C communicates with the inside and outside in the radial direction, but the notch 19A does not communicate with the inside and outside in the radial direction.
That is, the notch 19 </ b> A is not formed over the entire radial direction of the outer surface in the axial direction of the outer diameter mounting portion 15, leaving the blocking portion 20 on the inner peripheral side, and radially outward from the radially outer surface of the blocking portion 20. It extends to the end.
Therefore, in the state where the pressure inside and outside the seal (inside and outside the bearing) shown in FIGS. 4 and 5A is balanced, the outer surface in the axial direction of the portion where the notch 19A of the outer diameter mounting portion 15 is not formed and the blocking portion 20. Since the state where the contact surface 20A is continuously in contact with the inner surface of the annular pressing member 9C is maintained in this annular state, the inside and outside of the seal do not communicate with each other in this state, so the notches 19A, 19B, Even if 19C is formed, the sealing performance does not deteriorate.

When the pressure inside and outside the seal shown in FIGS. 4 and 5 (a) is balanced, and the bearing 1 whose temperature has risen is cooled and the inside of the bearing becomes negative pressure, the seal lip 14 is shown in FIG. 5 (b). Is pressed against the inner ring 2 (side wall surface 8), and as a result, the contact seal 11 is tilted so that the inner diameter side of the core metal 12 and the elastic body 13 moves inward in the axial direction. In this state, the contact surface 20A of the blocking portion 20 Is separated from the inner surface of the presser member 9C, the notch 19A, 19B, 19C formed in the outer diameter mounting portion 15 allows the inside and outside of the seal to communicate with each other so that the pressure inside and outside the seal can be instantaneously balanced. 11 instantaneously returns to the state shown in FIGS. 4 and 5A, so that the occurrence of the sticking phenomenon can be prevented.
Further, in the state where the contact seal 11 has returned to the state shown in FIGS. 4 and 5A as described above, the inside and outside of the seal do not communicate with each other, so that the sealing performance does not deteriorate.

FIG. 7 shows a one-way clutch 21 equipped with the same contact seals 11 as in FIG. 6, and the same reference numerals as those in FIGS. 4 and 5 denote the same or corresponding parts.
7, the connecting member 23 is attached to the inner ring 2 of the rolling bearing 1, the inner member IP is attached to the outer ring 3, the outer member OP is attached to the connecting member 23, and the outer member OP is from the outer peripheral surface of the inner member IP. Also, the clutch mechanism portion 22 is accommodated between the inner member IP and the outer member OP.
The one-way clutch 21 is configured such that the outer diameter mounting portion 15 of the contact seal 11 is fitted to the step formed by the side wall surface extending in the radial direction of the outer member OP and the inner peripheral surface extending in the axial direction. The outer surface (front surface) of the mounting portion 15 in the axial direction is pressed and positioned by the connecting member 23 and the pressing member 24, the seals 11 and 11 are attached to the outer member OP, and the annular openings A and A between the inner member IP and the outer member OP. Blocking A.

The contact seal 11 shown in FIG. 7 is the same as the contact seal 11 shown in FIG. 6. The outer diameter mounting portion 15 includes a cutout 19A on the axial outer surface (surface), a cutout 19B on the outer peripheral surface, and an axial inner surface (bottom surface). ) Is formed, and the notch 19A is not formed over the entire radial direction of the outer surface in the axial direction of the outer diameter mounting portion 15, and the blocking portion 20 is left on the inner peripheral side.
Therefore, in the state where the pressure inside and outside the seal shown in FIG. 7A is balanced, the outer surface in the axial direction of the outer diameter mounting portion 15 where the notch 19A is not formed and the contact surface 20A of the blocking portion 20 are formed. Since the state where the inner surface of the connecting member 23 and the pressing member 24 is in contact with the inner surface of the connecting member 23 and the pressing member 24 is maintained continuously in an annular shape, the inside and outside of the seal are not communicated with each other, so the notches 19A, 19B, and 19C are formed. However, the sealing performance does not deteriorate.

When the clutch mechanism 22 that has risen in temperature is cooled and the clutch mechanism 22 becomes negative pressure from the state in which the pressure inside and outside the seal shown in FIG. 7 (a) is balanced, the seal lip is shown in FIG. 7 (b). 14 is pressed inward in the axial direction. As a result, the contact seal 11 is tilted so that the inner diameter side of the core metal 12 and the elastic body 13 moves inward in the axial direction. In this state, the contact surface 20A of the blocking portion 20 is connected to the connecting member. 23 and the inner surface of the pressing member 24, the notches 19A, 19B, 19C formed in the outer diameter mounting portion 15 allow the inside and outside of the seal to communicate with each other, and the pressure inside and outside the seal can be instantaneously balanced, so that contact is made. Since the seal 11 instantaneously returns to the state of FIG. 7A, it is possible to prevent the occurrence of the sticking phenomenon.
Further, in the state where the contact seal 11 has returned to the state shown in FIG. 7A, the seal performance does not deteriorate because the inside and outside of the seal are not in communication.

  In addition, a normal use state in which the pressure inside and outside the seal in the first and second embodiments is balanced (FIGS. 1 and 2A of the first embodiment and FIGS. 4 and 5 of the second embodiment). In (a) and FIG. 7 (a), since the inside and outside of the seal are not in communication, the size of the notch is set in order to prevent deterioration of the sealing performance as in the case of a conventional contact seal in which the inside and outside of the seal are in communication. Since it is not necessary to manage strictly, an increase in manufacturing cost can be suppressed.

In the above description of the first and second embodiments, the configuration in which the outer member OP rotates with respect to the inner member IP is shown, but the present invention is directed to the configuration in which the inner member IP rotates with respect to the outer member OP. Even if the inner member IP is configured to rotate with respect to the outer member OP, the same effects as those described above can be obtained.
That is, when the inner member IP rotates with respect to the outer member OP in the configuration of the first embodiment, the inner member IP is attached to the inner member IP that rotates in the radial direction from the inner peripheral surface of the outer member OP. A contact seal that closes an annular opening A between the outer member OP and the inner member IP, covers the annular cored bar 12 with an elastic body 13, and uses the outer peripheral side end of the elastic body 13 as a seal lip and an inner diameter mounting portion. 11 is formed on the inner peripheral surface of the inner diameter mounting portion with a notch communicating inward and outward in the axial direction, and on the inner surface in the axial direction of the inner diameter mounting portion from the radially outer surface of the inner diameter side blocking portion to the radially outer end portion. In a state where a notch that does not communicate with the inside and outside in the radial direction extending to the inside is formed and the sealed portion (inside the bearing) becomes negative pressure and the outer diameter side of the cored bar 12 and the elastic body 13 is tilted so as to move inward in the axial direction. Inner diameter side blocking part is the diameter of inner member IP Configured so as to be separated from the sidewall surface extending direction.

  Further, when the inner member IP rotates with respect to the outer member OP in the configuration of the second embodiment, the inner member IP is attached to the inner member IP that rotates while being positioned radially inward from the inner peripheral surface of the outer member OP. A contact seal that closes an annular opening A between the outer member OP and the inner member IP, covers the annular cored bar 12 with an elastic body 13, and uses the outer peripheral side end of the elastic body 13 as a seal lip and an inner diameter mounting portion. 11 is formed on the inner peripheral surface of the inner diameter mounting portion with a notch communicating inward and outward in the axial direction, the inner surface in the axial direction of the inner diameter mounting portion is formed with a notch communicating with the inner side in the radial direction, and A notch that does not communicate with the radially inner and outer ends extending from the radially inner side surface of the outer diameter side blocking portion to the radially inner end is formed on the outer surface in the axial direction, and the sealed portion (bearing inside, etc.) becomes negative pressure and the core metal 12 and the outer diameter side of the elastic body 13 are moved inward in the axial direction. It is in a tilted state to configured so as to be separated from the inner surface extending in the radial direction of the pressing member in which the outer diameter side blocking unit presses the side surface of the inner member IP.

A Annular opening IP Inner member OP Outer member 1 Rolling bearing 2 Inner ring 3 Outer ring 4 Cage 5 Rolling element 6, 7 circumferential groove 7A Side wall surface 8 Side wall surface 9A Side wall surface 9B Inner circumferential surface 9C Presser member 10 Grease 11 Contact seal 12 Core Gold 13 Elastic body 14 Seal lip 15 Outer diameter mounting portion 16 Constricted portion 17A, 17B Notch 18 Blocking portion 18A Contact surface 19A, 19B, 19C Notch 20 Blocking portion 20A Contact surface 21 One-way clutch 22 Clutch mechanism portion 23 Connecting member 24 Presser member

Claims (4)

It is attached to an outer member that is positioned radially outward from the outer peripheral surface of the inner member, and closes an annular opening between the inner member and the outer member. A contact seal having inner and outer peripheral side ends as a seal lip and an outer diameter mounting portion,
A notch communicating inward and outward in the axial direction is formed on the outer peripheral surface of the outer diameter mounting portion, and extends from the radially inner side surface of the outer diameter side blocking portion to the radially inner end on the axial inner surface of the outer diameter mounting portion. Form a notch that does not communicate radially in and out,
The blocking portion is separated from the side wall surface extending in the radial direction of the outer member when the sealed portion is inclined so that the inner diameter side of the metal core and the elastic body moves inward in the axial direction due to negative pressure. And contact seal. It is attached to an outer member that is positioned radially outward from the outer peripheral surface of the inner member, and closes an annular opening between the inner member and the outer member. A contact seal having inner and outer peripheral side ends as a seal lip and an outer diameter mounting portion,
A notch communicating inward and outward in the axial direction is formed on the outer peripheral surface of the outer diameter mounting portion, a notch communicating inward and outward in the radial direction is formed on the inner surface in the axial direction of the outer diameter mounting portion, and the axial direction of the outer diameter mounting portion Formed on the outer surface is a notch that does not communicate with the radially inner and outer ends extending from the radially outer surface of the inner diameter side blocking portion to the radially outer end,
From the inner surface extending in the radial direction of the presser member where the blocking portion presses the side surface of the outer member when the sealed portion is inclined so that the inner diameter side of the core metal and the elastic body moves inward in the axial direction due to negative pressure. A contact seal characterized by being spaced apart. The elastic member is attached to an inner member that rotates and is positioned radially inward of the inner peripheral surface of the outer member, and covers an annular opening between the outer member and the inner member. A contact seal having a seal lip and an inner diameter mounting part at the outer peripheral side end of
A radial direction extending from the radially outer side surface of the inner diameter side blocking portion to the radially outer end portion is formed on the inner circumferential surface of the inner diameter mounting portion so as to communicate with the inner and outer sides in the axial direction. Form a notch that does not communicate inside and outside,
In a state where the sealed portion is in a negative pressure and the outer diameter side of the core metal and the elastic body is inclined so as to move inward in the axial direction, the blocking portion is separated from the side wall surface extending in the radial direction of the inner member. Feature contact seal. The elastic member is attached to an inner member that rotates and is positioned radially inward of the inner peripheral surface of the outer member, and covers an annular opening between the outer member and the inner member. A contact seal having a seal lip and an inner diameter mounting part at the outer peripheral side end of
A notch communicating inward and outward in the axial direction is formed on the inner peripheral surface of the inner diameter mounting portion, and a notch communicating inward and outward in the radial direction is formed on the inner surface in the axial direction of the inner diameter mounting portion, and on the outer surface in the axial direction of the inner diameter mounting portion. A notch that does not communicate with the radially inner and outer ends extending from the radially inner side surface of the outer diameter side blocking portion to the radially inner end,
The inner surface extending in the radial direction of the holding member that holds the side surface of the inner member in a state where the sealed portion is inclined so that the outer diameter side of the cored bar and the elastic body moves inward in the axial direction due to negative pressure. Contact seal characterized in that it is spaced from

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