JP2021025595A - Rotation seal - Google Patents

Abstract

To provide a rotation seal capable of suppressing the outflow of grease from near the front end of an axial lip during initial operation to be done after assembling the rotation seal on a bearing device or the like for supporting the wheels of an automobile.SOLUTION: A rotation seal 1 includes a grease outflow suppressing body C formed of an elastic material to be protruded from an outward flange part 2B of a slinger 2 to an axial lip 4B. The grease outflow suppressing body C wipes the grease G deposited on the inner diameter side front end of the axial lip 4B into the inner diameter side while being in contact with the inner diameter side front end of the axial lip 4B, when the slinger 2, a core metal 3 and a seal member 4 are relatively moved in the axial direction and assembled thereon.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotating seal used for a rotating shaft of a transportation machine or a general machine.

For example, as a rotation seal used for a rotating shaft of a bearing device for supporting an automobile wheel, a slinger attached to an inner ring, a core metal attached to an outer ring, and a seal member joined to the core metal are provided. There are some (see, for example, Patent Documents 1 to 3).

The rotating seals of Patent Documents 1 and 2 have two radial lips as the sealing members (see the radial lips 17b and 17c of FIG. 2 of Patent Document 1 and the seal lips 4C and 4D of FIG. 2 of Patent Document 2). And one axial lip (see the side lip 17a of FIG. 2 of Patent Document 1 and the seal lip portion 4B of FIG. 2 of Patent Document 2).

The rotating seal of Patent Document 3 has one radial lip (see the grease lip 12b of FIG. 2 of Patent Document 3) and one axial lip (see the side lip 12e of FIG. 2 of Patent Document 3) as the sealing member. In the intermediate portion between the tip end portion and the base end portion of the axial lip, a tapered ring-shaped protrusion (for example, a patent) having a smaller diameter on the outward flange portion (disk portion 10b) side of the slinger is provided. It has a protrusion 15) in FIG. 2 of Document 3.

Japanese Unexamined Patent Publication No. 2008-014439 JP-A-2018-150954 JP-A-2014-059048

The invention described in Patent Document 3 focuses on a rotary seal having one radial lip (grease lip 12b) (FIG. 9 of Patent Document 3), and extracts the problem of the rotary seal having such a lip structure. (Patent Document 3 [0007]). That is, the problem is that in the rotating seal having one radial lip, the grease in the space between the lips tends to move to the axial lip (side lip 12e) side relatively early, and the tip of the axial lip and the slinger face outward. This means that grease easily flows out from the gap between the flange portion (disk portion 10b).

In order to solve the above problem, the invention described in Patent Document 3 has a tapered protrusion (for example, a patent) in an intermediate portion between a tip end portion and a base end portion of an axial lip (side lip 12e). A protrusion 15 in FIG. 2 of Document 3) is provided ([Claim 1], [0010]).

According to Patent Document 3, in a rotating seal provided with two radial lips as in Patent Documents 1 and 2, grease is held in a space between the two radial lips (grease lip and main lip), and grease is retained. Since the tip of the main lip is close to the outward flange (disk part) of the slinger, the grease is held in the space surrounded by the main lip, the grease lip, and the cylindrical part (fixing part) of the slinger. There is a description that the problem does not occur because the grease is easily supplied from the space for a long period of time (Patent Document 3 [0008]).

The inventors of the present application conducted a test for evaluating the outflow of grease with respect to the rotary seal corresponding to the rotary seal of Patent Documents 1 and 2. That is, a rotating seal having two radial lips and one axial lip is assembled to the test device, a rotating shaft equipped with a slinger is driven by a motor of the testing device, and the rotating shaft is driven at a predetermined rotation speed for a predetermined time. The initial operation of rotation was performed to measure the amount of grease flowing out.
As a result, it was found that when the initial operation is performed, grease leaks from the vicinity of the tip of the axial lip due to centrifugal force, and a phenomenon occurs in which grease flows out and stays toward the labyrinth of the rotation seal.
Here, the labyrinth is, for example, reference numeral H in FIG. 7A, and is formed between the encoder member 5 and the inner peripheral surface side of the core metal cylindrical portion 3A. When the slinger 2 is not provided with the encoder member 5, the labyrinth H is formed between the end of the outward flange portion 2B of the slinger 2 and the inner peripheral surface side of the core metal cylindrical portion 3A.

Based on these findings, the present invention provides a rotary seal that can suppress the outflow of grease from the vicinity of the tip of the axial lip during initial operation after assembling the rotary seal to a bearing device for supporting wheels of an automobile. The main purpose is to provide.

The present invention provides a rotating seal having the following structure in order to achieve the above object.

(1)
A rotary seal including a slinger attached to the inner diameter side member, a core metal attached to the outer diameter side member, and a seal member joined to the core metal.
The slinger
It consists of a slinger cylindrical portion that fits outside the inner diameter side member, and an outward flange portion that extends radially outward from one end in the axial direction of the slinger cylindrical portion.
The core metal is
It is composed of a core metal cylindrical portion that is internally fitted into the outer diameter side member, and an inward flange portion that extends inward in the radial direction from one end of the core metal cylindrical portion in the axial direction.
The seal member is
Includes an axial lip that slides into the outward flange of the slinger
The rotating seal further
A grease outflow suppressor made of an elastic material is provided, which projects from the outward flange portion of the slinger toward the axial lip.
The grease outflow suppressor is
When the slinger, the core metal, and the seal member are relatively moved in the axial direction and assembled, they adhere to the inner diameter side tip of the axial lip while being in contact with the inner diameter side tip of the axial lip. A rotating seal that is characterized by scraping the grease on the inner diameter side.

(2)
The rotation seal according to (1), wherein the grease outflow inhibitor contacts the inner diameter side of the axial lip from the minimum tightening allowance to the maximum tightening allowance of the axial lip.

(3)
The rotation seal according to (1) or (2), wherein the grease outflow suppressor has a lip shape.

According to the rotary seal according to the present invention described above, the following effects are obtained.

According to the configuration of (1), it is possible to almost eliminate grease leaking from the vicinity of the tip of the axial lip due to centrifugal force during the initial operation of the device incorporating the rotation seal. As a result, grease does not stick to the inner peripheral surface side of the core metal cylinder of the rotary seal, so even if water (muddy water) enters the labyrinth of the rotary seal, the water does not collide with the grease and scatter. Therefore, the amount of water on the tip of the axial lip does not increase.

According to the configuration of (2), the grease leaking from the vicinity of the tip of the axial lip due to centrifugal force can be continuously suppressed.

According to the configuration of (3), the pressing of the axial lip by the grease outflow suppressor is alleviated, so that it is possible to suppress a decrease in the surface pressure of the sliding portion between the tip of the axial lip and the sliding contact surface of the outward flange portion. it can.

It is a partial vertical cross-sectional schematic diagram which shows the example which used the rotary seal which concerns on embodiment of this invention in the bearing device for wheel support of an automobile. It is an enlarged vertical sectional view of the main part around the rotation seal which concerns on embodiment of this invention. It is an end view of the cut part by the plane including the axial direction which shows the assembly which moves the slinger, the core metal and the seal member relatively in the axial direction and assembles. The assembly proceeds from (a) to (d), and (d) indicates a state in which the assembly is completed. It is an end view of the cut part by the plane including the axial direction which shows the 1st modification of a grease outflow restraint body, and shows the assembly. The assembly proceeds from (a) to (d), and (d) indicates a state in which the assembly is completed. It is an end view of the cut part by the plane including the axial direction which shows the 2nd modification of the grease outflow restraint body, and shows the assembly. The assembly proceeds from (a) to (d), and (d) indicates a state in which the assembly is completed. Regarding the third modification of the grease outflow suppressing body, it is the end view of the cut part by the plane including the axial direction which shows by omitting the grease, and shows the assembly. (A) shows a state in which the assembly is in progress, and (b) shows a state in which the assembly is completed. It is a top view of the cut portion by the plane including the axial direction which shows the conventional rotation seal. (A) shows the state where the assembly is completed, and (b) shows the state after the initial operation.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
In the present specification, the direction of the rotation axis of the bearing device 10 for supporting the wheel of an automobile is referred to as "axial direction", and the direction orthogonal to the axial direction is referred to as "radial direction".
In addition, the direction parallel to the axial direction from the vehicle body to the wheel side (outboard) is "outside" (see the arrow OB in FIG. 1), and the direction parallel to the axial direction from the vehicle body to the vehicle body side (in). The board) is referred to as "inside" (see arrow IB in FIG. 1).

<Bearing device>
The schematic partial vertical cross-sectional view of FIG. 1 shows an example in which the rotary seal 1 according to the embodiment of the present invention is used inside the bearing device 10 for supporting a wheel of an automobile.
The bearing device 10 includes a bearing having an inner ring 6 which is an inner diameter side member A, an outer ring 7 which is an outer diameter side member B, a ball 8 which is a rolling element, and the like.
An inner ring raceway surface 6A is formed on the outer peripheral surface of the inner ring 6, an outer ring raceway surface 7A is formed on the inner peripheral surface of the outer ring 7, and the ball 8 rolls between the inner ring raceway surface 6A and the outer ring raceway surface 7A.

Further, the bearing device 10 has muddy water on the inner and outer ends (inner side of the inner ball 8 and outer side of the outer ball 8) between the inner ring 6 and the outer ring 7 of the bearing. It is provided with rotation seals 1 and 9 for preventing the intrusion of such materials and for preventing the leakage of lubricating grease, and is provided with an encoder device for detecting the rotation speed (rotation speed) of the wheels.

<Rotating seal>
As shown in the enlarged vertical sectional view of the main part of FIG. 2, the inner rotation seal 1 of the bearing device 10 according to the embodiment of the present invention is attached to the slinger 2 mounted on the inner ring 6 and the outer ring 7. The core metal 3 to be formed and the seal member 4 joined to the core metal 3 are provided. In FIG. 2, the illustration of grease is omitted.

The slinger 2 includes a slinger cylindrical portion 2A that fits outside the inner ring 6 and an outward flange portion 2B that extends radially outward from one end (inner side end portion) in the axial direction of the slinger cylindrical portion 2A.
An encoder member 5 such as a rubber magnet or a plastic magnet, which constitutes the encoder device, is joined to the outward flange portion 2B, and a sensor (not shown) constituting the encoder device faces the encoder member 5 from the axial direction. To do.
The rotation seal 1 of the present invention is not limited to the slinger 2 provided with the encoder member 5, and the slinger 2 may not be provided with the encoder member 5.

The core metal 3 includes a core metal cylindrical portion 3A that fits inside the outer ring 7 and an inward flange portion 3B that extends radially inward from one end (outer side end portion) in the axial direction of the core metal cylindrical portion 3A.
The slinger 2 and the core metal 3 are manufactured from, for example, a stainless steel plate by pressing.

The base 4A of the sealing member 4, which is a synthetic rubber, is vulcanized and adhered to the core metal 3.
The sealing member 4 includes an axial lip 4B that extends from the substrate 4A and is in sliding contact with the sliding contact surface 2C of the outward flange portion 2B of the slinger 2, and radial lips 4C and 4D that are in sliding contact with the outer peripheral surface of the slinger cylindrical portion 2A of the slinger 2. It has a lip structure consisting of.

In the free state without elastic deformation (see FIG. 3A), the axial lip 4B has a truncated cone side surface shape in which the diameter increases toward the tip, that is, as it approaches the outward flange portion 2B of the slinger 2. ..
The sealing member 4 has an outer peripheral sealing portion 4E that covers the tip (inner side end portion) of the core metal cylindrical portion 3A of the core metal 3, and the outer peripheral sealing portion 4E is from the inner peripheral surface side of the core metal cylindrical portion 3A. It is connected to the base 4A.

As the synthetic rubber material forming the seal member 4, nitrile rubber (NBR), hydride nitrile rubber (HNBR), acrylic rubber (ACM), ethylene / acrylic rubber (AEM), fluorine as rubber materials having good oil resistance. From rubbers such as rubber (FKM, FPM) and silicone rubber (VQM), one type or two or more types of rubber can be appropriately blended and used. Considering the kneading processability, vulverable formability, and adhesion to the core metal 3 of the rubber material, other types of rubber, such as liquid NBR, ethylene propylene rubber (EPDM), natural rubber (NR), and isoprene. It is also a preferred embodiment to use it by blending it with rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR) or the like.

<Grease outflow suppressor>
The rotary seal 1 further includes a projecting body 11 which is a grease outflow suppressing body C formed of an elastic material and projects from the outward flange portion 2B of the slinger 2 toward the axial lip 4B.
The elastic material forming the projecting body 11 is, for example, the same as the example of the synthetic rubber material forming the sealing member 4. The elastic material forming the projecting body 11 may be the same as the synthetic rubber material forming the seal member 4, or may be different from the synthetic rubber material forming the seal member 4.
The projecting body 11 has an annular shape in which the cross section cut by a plane including the axial direction is substantially triangular, and is vulcanized and bonded to, for example, the sliding contact surface 2C of the outward flange portion 2B of the slinger 2.

Next, the operation of the projecting body 11 will be described with reference to the end view of the cut portion of FIGS. 3A to 3D.

As shown in FIG. 3A, grease G is filled between the axial lip 4B and the radial lip 4C.
From the state of FIG. 3 (a), as shown in FIGS. 3 (b) to 3 (d), when the slinger 2, the core metal 3 and the seal member 4 are relatively moved in the axial direction and assembled, the axial lip 4B is assembled. The grease G at the tip portion D on the inner diameter side is continuously scraped inward in the radial direction by the projecting body 11.

In the state where the rotation seal 1 has been assembled as shown in FIG. 3D, the grease G has disappeared as a lump on the outer side in the radial direction from the projecting body 11. That is, most of the grease G on the inner diameter side tip D of the axial lip 4B moves inward in the radial direction from the protrusion 11.

As described above, the projecting body 11 which is the grease outflow suppressing body C is assembled by moving the slinger 2, the core metal 3, and the sealing member 4 in the axial direction relatively, and assembling the axial lip 4B on the inner diameter side tip portion D. It has a function of scraping the grease G adhering to the inner diameter side tip D of the axial lip 4B to the inner diameter side while in contact with.
The protruding body 11 which is the grease outflow suppressing body C comes into contact with the inner diameter side of the axial lip 4B from the minimum tightening allowance to the maximum tightening allowance of the axial lip 4B.
Here, the minimum tightening allowance to the maximum tightening allowance are dimensional variations due to the finished product of the slinger 2, the core metal 3, and the seal member 4, and the slinger 2, the core metal 3, and the seal member 4 are relatively axial to each other. It is the range of tightening allowance that allows variation due to errors during assembly by moving in the direction.

<Test to evaluate grease outflow>
A test is conducted to confirm the effect of suppressing the outflow of grease G by the grease outflow suppressor C having the above function.

(Examples and comparative examples)
The rotation seal 1 shown in the end view of the cut portion of FIG. 3 (d) is used as an example, and the rotation seal 1A without the grease outflow inhibitor C shown in the end view of the cut portion of FIG. 7 (a) is used as a comparative example.

(Test method)
(1) The grease G is the grease "Raremax" (registered trademark) AF-I (manufactured by Kyodo Yushi Co., Ltd.) for automobile wheel bearings, and the normal amount is 0.3 g.
(2) The rotating seal 1 of the example and the rotating seal 1A of the comparative example are assembled to the test apparatus, and the tightening allowance in the state where the assembly is completed is 0.7 mm.
(3) The rotating shaft on which the slinger 2 is mounted is driven by the motor of the test device, and the initial operation is performed in which the rotating speed of the rotating shaft is maintained at 1500 rpm and held for 5 minutes.
(4) The outflow of grease G from the rotating seals 1 and 1A after the initial operation is evaluated.

(Test results)
After performing the initial operation, in the rotary seal 1A of the comparative example, as shown in the end view of the cut portion in FIG. 7B, the grease G in the space E between the radial lip 4C and the axial lip 4B is , Leaked from the vicinity of the tip of the axial lip 4B by centrifugal force.
The amount of the leaked grease G was 0.06 g, and as shown in FIG. 7B, the scattered grease SG was attached to the inner peripheral surface side of the core metal cylindrical portion 3A forming the labyrinth H. ..

When water (muddy water) infiltrates into the labyrinth H as shown by arrow F in a state where the scattered grease SG is attached to the inner peripheral surface side of the core metal cylindrical portion 3A as shown in FIG. 7 (b), the core metal Since water collides with the grease SG attached to the inner peripheral surface side of the cylindrical portion 3A and scatters, the amount of water applied to the tip of the axial lip 4B increases.

After performing the initial operation, in the rotary seal 1 of the embodiment, in the grease G in the space E between the radial lip 4C and the axial lip 4B shown in the end view of the cut portion in FIG. 3D, The amount of grease leaking from the vicinity of the tip of the axial lip 4B by centrifugal force was approximately 0 (0.00 g), and the grease did not scatter and stick to the inner peripheral surface side of the core metal cylindrical portion 3A forming the labyrinth H. ..

Therefore, in the embodiment, even if water (muddy water) invades the labyrinth H as shown by the arrow F in FIG. 3D, the water does not collide with the scattered grease and the water does not scatter. The amount of water on the tip of the lip 4B does not increase.

<Modification example>
Next, a modified example of the grease outflow suppressing body C made of an elastic material, which protrudes from the outward flange portion 2B of the slinger 2 toward the axial lip 4B, will be described.

(First modification)
The projecting body 12, which is a first modification of the grease outflow suppressing body C shown in the end view of the cut portion of FIGS. 4A to 4D, has a lip shape, and is, for example, an outward flange portion 2B of the slinger 2. It is vulcanized and adhered to the sliding contact surface 2C.
In the free state where the projecting body 12 is not elastically deformed (see FIG. 4A), the projecting body 12 has a truncated cone side surface shape in which the diameter increases toward the tip, that is, as it approaches the inward flange portion 3B of the core metal 3. is there.

The projecting bodies 12 of FIGS. 4A to 4D have the same functions as the projecting bodies 11 of FIGS. 3A to 3D.
That is, the projecting body 12, which is the grease outflow suppressing body C, comes into contact with the inner diameter side tip D of the axial lip 4B when the slinger 2, the core metal 3, and the sealing member 4 are relatively moved in the axial direction and assembled. At the same time, it has a function of scraping the grease G adhering to the inner diameter side tip D of the axial lip 4B to the inner diameter side.
The protruding body 12 which is the grease outflow suppressing body C comes into contact with the inner diameter side of the axial lip 4B from the minimum tightening allowance to the maximum tightening allowance of the axial lip 4B.

The rigidity of the lip-shaped projecting body 12 is set to be smaller than the rigidity of the axial lip 4B. Therefore, the projecting body 12 in contact with the axial lip 4B is deformed as shown in FIGS. 4A to 4D. As a result, the pushing down of the axial lip 4B by the projecting body 12 is relaxed, so that it is possible to suppress a decrease in the surface pressure of the sliding portion between the tip of the axial lip 4B and the sliding contact surface 2C of the outward flange portion 2B.

(Second modification)
The projecting body 13, which is a second modification of the grease outflow suppressing body C shown in the end view of the cut portion of FIGS. 5A to 5D, has a lip shape, and is, for example, an outward flange portion 2B of the slinger 2. It is vulcanized and adhered to the sliding contact surface 2C.
In the free state where the projecting body 13 is not elastically deformed (see FIG. 5A), the projecting body 13 has a truncated cone side surface shape in which the diameter increases toward the tip, that is, as it approaches the inward flange portion 3B of the core metal 3. is there.
Unlike the projecting body 12 of the first modification, the projecting body 13 has an annular ridge portion 13A on the inner diameter side. Then, in the state where the assembly of the rotation seal 1 is completed as shown in FIG. 5D, the axial lip 4B comes into close contact with the contact surface 13B on the outer diameter side of the annular ridge portion 13A.

The projecting bodies 13 of FIGS. 5A to 5D have the same functions as the projecting bodies 12 of FIGS. 4A to 4D.
Further, as shown in FIG. 5D, when the rotation seal 1 is assembled, the axial lip 4B comes into close contact with the contact surface 13B of the projecting body 13, so that the effect of suppressing the outflow of grease G is obtained. It gets higher.

(Third modification example)
The projecting body 14, which is a third modification of the grease outflow suppressing body C shown in the end views of the cut portions of FIGS. 6A and 6B, has a lip shape, and is, for example, an outward flange portion 2B of the slinger 2. It is vulcanized and adhered to the sliding contact surface 2C.
In the free state where the projecting body 14 is not elastically deformed (see FIG. 6A), the tip side of the protruding body 14 is closer to the tip than the bent portion 14A provided at the intermediate position in the direction toward the inward flange portion 3B of the core metal 3. It has a truncated cone side surface that shrinks in diameter as it goes, that is, as it approaches the inward flange portion 3B of the core metal 3.
Note that the grease is not shown in FIGS. 6 (a) and 6 (b).

The projecting bodies 14 of FIGS. 6A and 6B have the same functions as the projecting bodies 12 of FIGS. 4A to 4D.
Further, since the axial lip 4B is in close contact with the contact surface 14B of the projecting body 14 in the state where the rotation seal 1 is assembled as shown in FIG. 6B, the effect of suppressing the outflow of grease G is obtained. It gets higher.

<Effect>
As described above, the rotation seal 1 includes a grease outflow suppressor C made of an elastic material, which protrudes from the outward flange portion 2B of the slinger 2 toward the axial lip 4B. When the slinger 2, the core metal 3, and the sealing member 4 are relatively moved in the axial direction and assembled, the grease outflow suppressing body C is in contact with the inner diameter side tip D of the axial lip 4B, while the grease outflow suppressing body C is attached to the axial lip 4B. The grease G adhering to the inner diameter side tip D is scraped into the inner diameter side.

Therefore, it is possible to almost eliminate the grease G leaking from the vicinity of the tip of the axial lip 4B by centrifugal force during the initial operation of the device incorporating the rotation seal 1 (for example, the bearing device for supporting the wheel of an automobile). As a result, the grease G does not stick to the inner peripheral surface side of the core metal cylindrical portion 3A of the rotating seal 1, so that even if water (muddy water) enters the labyrinth H of the rotating seal 1, water is added to the grease G. Does not collide and scatter, so the amount of water applied to the tip of the axial lip 4B does not increase.

Further, since the grease outflow suppressor C comes into contact with the inner diameter side of the axial lip 4B from the minimum tightening allowance to the maximum tightening allowance of the axial lip 4B, the grease G leaking from the vicinity of the tip of the axial lip 4B by centrifugal force is continued. Can be suppressed.
While the grease G leaking due to centrifugal force is continuously suppressed by the grease outflow suppressor C, the grease G in the space surrounded by the radial lip 4C, the axial lip 4B, and the grease outflow suppressor C is centrifuged for a long period of time. It is gradually supplied to the sliding contact surface 2C of the axial lip 4B and the slinger 2 by force.

All the descriptions of the above embodiments are examples, and the present invention is not limited thereto. Various improvements and modifications can be made without departing from the scope of the present invention.

1,1A Rotating seal 2 Slinger 2A Slinger Cylindrical part 2B Outward flange part 2C Sliding contact surface 3 Core metal 3A Core metal cylindrical part 3B Inward flange part 4 Sealing member 4A Base 4B Axial lip 4C, 4D Radial lip 4E Outer peripheral seal Part 5 Encoder member 6 Inner ring 6A Track surface 7 Outer ring 7A Track surface 8 Ball (rolling element)
9 Rotational seal 10 Bearing device 11-14 Protruding body 13A Protruding part 13B Contact surface 14A Bending part 14B Contact surface A Inner diameter side member B Outer diameter side member C Grease outflow suppressor D Inner diameter side tip part E of axial lip Space between radial lip and axial lip F Direction of water intrusion G Grease H Labyrinth IB Inner OB Outer SG Scattered grease

Claims (3)

A rotary seal including a slinger attached to the inner diameter side member, a core metal attached to the outer diameter side member, and a seal member joined to the core metal.
The slinger
It consists of a slinger cylindrical portion that fits outside the inner diameter side member, and an outward flange portion that extends radially outward from one end in the axial direction of the slinger cylindrical portion.
The core metal is
It is composed of a core metal cylindrical portion that is internally fitted into the outer diameter side member, and an inward flange portion that extends inward in the radial direction from one end of the core metal cylindrical portion in the axial direction.
The seal member is
Includes an axial lip that slides into the outward flange of the slinger
The rotating seal further
A grease outflow suppressor made of an elastic material is provided, which projects from the outward flange portion of the slinger toward the axial lip.
The grease outflow suppressor is
When the slinger, the core metal, and the sealing member are relatively moved in the axial direction and assembled, they adhere to the inner diameter side tip of the axial lip while contacting the inner diameter side tip of the axial lip. It is characterized by scraping the grease on the inner diameter side.
Rotating seal. The grease outflow suppressor comes into contact with the inner diameter side of the axial lip from the minimum tightening allowance to the maximum tightening allowance of the axial lip.
The rotating seal according to claim 1. The grease outflow suppressor has a lip shape.
The rotating seal according to claim 1 or 2.

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