CN113710933A - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- CN113710933A CN113710933A CN202080029436.7A CN202080029436A CN113710933A CN 113710933 A CN113710933 A CN 113710933A CN 202080029436 A CN202080029436 A CN 202080029436A CN 113710933 A CN113710933 A CN 113710933A
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- China
- Prior art keywords
- sealing
- seal lip
- seal
- lip
- outer peripheral
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The invention provides a sealing device, which can more easily detect the roll of a sealing lip on a liquid side to be sealed. A sealing device (1) is provided with: a reinforcement ring (10) having a ring shape and centered on an axis (X1); and an annular elastic body part (20) which is made of an elastic body, is attached to the reinforcement ring (10) about the axis (X1), and is provided with a seal lip (30) that slides on the inner peripheral member (102). The sealing lip (30) has: a main seal lip (40) extending from the inner circumferential end of the elastic body (20) at least toward the liquid to be sealed; and a seal-target-liquid-side seal lip (50) that extends at least from the seal-target-liquid-side end of the main seal lip (40) toward the seal-target-liquid side. The outer peripheral side surface of the liquid side seal lip (50) to be sealed has at least 1 protruding portion (60) extending from the outer peripheral side surface toward the outer peripheral side.
Description
Technical Field
The present invention relates to a sealing device.
Background
Conventionally, a sealing device for sealing between an outer circumferential member and an inner circumferential member, the outer circumferential member being annular and relatively rotatable with respect to each other on an axis, the inner circumferential member being at least partially surrounded by the outer circumferential member and being annular, is known (for example, refer to patent document 1).
Fig. 4 is a sectional view for showing a schematic structure of a conventional sealing device 110. The sealing device 110 includes: a sealing body 113 fixed to the case 112; a main seal lip 115 provided integrally with the seal body 113 and sliding with the rotary shaft 114; and a seal-target liquid side seal lip 116 disposed on the seal-target liquid side (right in the paper plane) of the main seal lip 115 and sliding on the rotary shaft 114.
Prior art documents
Patent document
Patent document 1: japanese Kokai publication Hei-5-30638
Disclosure of Invention
Problems to be solved by the invention
In such a sealing device 110, when the rotary shaft 114 is inserted from the sealing target liquid side to the atmosphere side (left direction of the paper), the sealing target liquid side seal lip 116 may be curled up. That is, in the sealing device 110, the rotary shaft 114 is inserted into the atmosphere side from the sealing target liquid side, and the tip of the sealing target liquid side seal lip 116 may be curled up toward the atmosphere side. Although it is difficult to confirm whether or not the sealing target liquid side seal lip 116 is turned over when viewed from the atmosphere side, a gap is generated between the main seal lip 115 and the rotary shaft 114 due to the turning over of the sealing target liquid side seal lip 116. Therefore, whether the sealing object liquid side seal lip 116 is curled or not is checked by checking the flow of air leaking through the sealing device 110 with the oil leakage checking device.
Here, when the seal-target liquid side seal lip 116 is partially curled up, since a gap is generated between the seal-target liquid side seal lip 116 and the rotary shaft 114, air leakage can be detected, and the curling of the seal-target liquid side seal lip 116 can be detected. However, if the entire seal-target liquid side seal lip 116 is curled up, since no gap is formed between the seal-target liquid side seal lip 116 and the rotary shaft 114, air leakage cannot be detected, and the curling of the seal-target liquid side seal lip 116 cannot be detected. Therefore, a conventional sealing device is required to have a structure capable of more easily detecting the turning of the sealing lip on the liquid side to be sealed.
The present invention has been made in view of the above problems, and an object thereof is to provide a sealing device capable of more easily detecting the turning of a seal lip on a liquid side to be sealed.
Means for solving the problems
In order to achieve the above object, the present invention is a sealing device for sealing between an annular outer peripheral member and an annular inner peripheral member at least partially surrounded by the outer peripheral member, the sealing device being relatively rotatable on an axis, the sealing device comprising: a reinforcing ring in a ring shape centered on the axis; and an annular elastic body portion made of an elastic body, attached to the reinforcement ring with the axis as the center, and provided with a seal lip portion that slides with the inner peripheral member, the seal lip portion including: a main seal lip portion extending from an inner circumferential end portion of the elastic body portion at least toward a sealing target liquid side; and a sealing object liquid side sealing lip portion extending from a sealing object liquid side end portion of the main sealing lip portion at least toward the sealing object liquid side, the sealing object liquid side sealing lip portion having at least 1 protruding portion on an outer peripheral side surface thereof, the protruding portion extending from the outer peripheral side surface toward an outer peripheral side.
In the sealing device according to one embodiment of the present invention, the protruding portion is a convex portion having a triangular cross section and extending toward the outer peripheral side from the central portion of the outer peripheral side surface of the sealing-target-liquid-side sealing lip toward the sealing target liquid side, and a plurality of the protruding portions are formed concentrically from the axis line at equal angular intervals.
In the sealing device according to the embodiment of the present invention, a length from a root of the seal-target liquid side seal lip to a tip of the seal-target liquid side seal lip is longer than a length from the root of the seal-target liquid side seal lip to the tip of the main seal lip.
Effects of the invention
According to the sealing device of the present invention, the roll-up of the sealing lip on the liquid side to be sealed can be detected more easily.
Drawings
Fig. 1 is a sectional view for showing a schematic structure of a sealing device according to an embodiment of the present invention.
Fig. 2 is an enlarged sectional view for illustrating a schematic structure in the vicinity of a protrusion of a sealing device according to an embodiment of the present invention.
Fig. 3 is a sectional view showing a schematic structure of a seal structure in a state where the sealing device according to the embodiment of the present invention is assembled to a sealing target.
Fig. 4 is a sectional view for showing a schematic structure of a conventional sealing device.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a sectional view for showing a schematic structure of a sealing device 1 according to an embodiment of the present invention. Fig. 2 is an enlarged sectional view for illustrating a schematic structure in the vicinity of the protrusion 60 of the sealing device 1. In fig. 1, 2, only a single-sided portion of the sealing device 1 is shown. The sealing device 1 is used, for example, as a seal for a water pump of a vehicle. That is, the sealing device 1 functions to seal a gap between two members of various kinds of objects to be sealed. In addition, the applicable objects of the sealing device 1 are not limited to the above objects.
The sealing device 1 according to the embodiment of the present invention is used for sealing between the outer peripheral member 101 having an annular shape and being relatively rotatable with respect to each other on the axis X1 and the inner peripheral member 102 having an annular shape and being at least partially surrounded by the outer peripheral member 101. The sealing device 1 includes: a reinforcement ring 10, annular, centered on an axis X1; and an annular elastic body portion 20 made of an elastic body, attached to the reinforcement ring 10 about the axis X1, and provided with a seal lip portion 30 that slides on the inner peripheral member 102.
The seal lip 30 has: a main seal lip 40 extending from an inner peripheral end of the elastic body portion 20 at least toward the sealing target liquid side; and a seal target liquid side seal lip 50 extending from a seal target liquid side end portion of the main seal lip 40 at least toward the seal target liquid side. The sealing-target-liquid-side sealing lip 50 has at least 1 protruding portion 60 extending from the outer peripheral side surface toward the outer peripheral side on the outer peripheral side surface. The structure of the sealing device 1 will be described in detail below.
In the following description, for convenience of explanation, one direction (direction of arrow a) in which a liquid to be sealed such as oil is sealed, which is one direction (direction of arrow a) of the direction of the axis X1 (hereinafter, also referred to as the direction of axis X1) which is the axis of the sealing device 1 in fig. 1 and 2, is referred to as a liquid side to be sealed, and the other direction (direction of arrow b) is referred to as an atmosphere side. In fig. 1 and 2, one direction (the direction of arrow c) in a direction (hereinafter, also referred to as a radial direction) extending perpendicular to the axis X1 of the sealing device 1 is defined as an inner peripheral side, and the other direction (the direction of arrow d) is defined as an outer peripheral side. In the following description, when the positional relationship and the direction of each member are described, the positional relationship and the direction in the drawings are merely shown, and the positional relationship and the direction when actually assembled to a vehicle or the like are not shown.
As shown in fig. 1 and 2, the sealing device 1 has an annular or substantially annular outer shape formed around an axis X1, and a cylindrical or substantially cylindrical opening 2 is formed in a central portion thereof. The outer shape of the sealing device 1 is a circular ring shape or substantially circular ring shape formed around the axis X1. The sealing device 1 includes: a reinforcement ring 10 formed in a ring shape or a substantially cylindrical shape around an axis X1; and an elastic body portion 20 formed of an elastic body integrally molded with the reinforcing ring 10 and formed in an annular or substantially annular shape around the axis X1.
The elastomer of the elastomer portion 20 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcement ring 10 is made of, for example, metal, and is manufactured by press working or forging, and the elastic body portion 20 is formed by cross-linking (vulcanization) molding using a molding die.
The reinforcing ring 10 has a cylindrical portion 11 and an annular atmosphere-side flange portion 12 extending from an atmosphere-side end portion, which is an atmosphere-side end portion of the cylindrical portion 11, toward an inner circumferential side. Specifically, the cylindrical portion 11 extends parallel or substantially parallel to the direction of the axis X1, and is formed in a cylindrical shape or substantially cylindrical shape around the axis X1. The liquid-side end, the air-side end, the inner peripheral side surface, and the outer peripheral side surface of the cylindrical portion 11 to be sealed are embedded in the elastic body portion 20.
The atmospheric-side flange portion 12 is a flange portion that extends parallel or substantially parallel to the radial direction, extends from the atmospheric-side end portion of the cylindrical portion 11 toward the inner circumferential side, and is formed in an annular shape or substantially annular shape around the axis X1. The liquid side surface to be sealed, the atmospheric side surface, the inner peripheral end portion, and the outer peripheral end portion (the liquid side end portion to be sealed of the cylindrical portion 11) of the atmospheric side flange portion 12 are embedded in the elastic body portion 20.
The elastic body portion 20 includes a sealing target liquid side elastic body portion 21, an atmosphere side elastic body portion 22, a seal lip portion 30, and a dust lip portion 23. The sealing target liquid side elastic body portion 21 covers the sealing target liquid side of the cylindrical portion 11, the inner peripheral side surface of the cylindrical portion 11, the sealing target liquid side surface of the atmosphere side flange portion 12, and the inner peripheral side end portion of the atmosphere side flange portion 12, and a part of the sealing target liquid side surface of the atmosphere side flange portion 12 is exposed.
The sealing target liquid side elastic body portion 21 includes: an inner peripheral side portion 21c extending parallel or substantially parallel to the direction of the axis X1 and formed in a cylindrical shape or substantially cylindrical shape around the axis X1; and a liquid-to-be-sealed portion 21a extending in parallel or substantially parallel to the radial direction, extending from the atmosphere-side end of the inner peripheral portion 21c toward the inner peripheral side, and formed in an annular or substantially annular shape around the axis X1.
A liquid-to-be-sealed side positioning portion 24 for fixing the position of the reinforcing ring 10 during vulcanization is formed on the liquid-to-be-sealed side surface of the liquid-to-be-sealed side portion 21a of the liquid-to-be-sealed side elastic body portion 21. The liquid-to-be-sealed-side positioning portion 24 is a groove portion having a rectangular or substantially rectangular cross section, which is recessed from the liquid-to-be-sealed-side surface of the liquid-to-be-sealed-side portion 21a toward the liquid-to-be-sealed-side surface of the atmosphere-side flange 12 of the reinforcing ring 10 at the center portion in the radial direction of the liquid-to-be-sealed-side portion 21 a. The liquid-side positioning portion 24 to be sealed is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis X1.
The atmosphere-side elastic body portion 22 covers the outer peripheral side surface of the cylindrical portion 11 of the reinforcement ring 10, the atmosphere-side end portion of the reinforcement ring 10 (the outer peripheral side end portion of the atmosphere-side flange portion 12), and the atmosphere-side surface of the atmosphere-side flange portion 12. The atmospheric-side elastic body portion 22 includes: an outer peripheral side portion 22d extending parallel or substantially parallel to the direction of the axis X1 and formed in a cylindrical shape or substantially cylindrical shape around an axis X1; and an atmosphere-side portion 22b extending in parallel or substantially in parallel with the radial direction, extending from the atmosphere-side end of the outer peripheral-side portion 22d toward the inner peripheral side, and formed in an annular shape or substantially annular shape around the axis X1. The outer peripheral portion 22d of the atmosphere side elastic body portion 22 has an outer peripheral lip 25, and the outer peripheral lip 25 extends from the outer peripheral portion 22d toward the outer peripheral side and is formed in an annular shape or a substantially annular shape around the axis X1.
An atmosphere-side positioning portion 26 for fixing the position of the reinforcing ring 10 during vulcanization is formed on the atmosphere-side surface of the atmosphere-side portion 22b of the atmosphere-side elastic body portion 22. The atmosphere-side positioning portion 26 is a groove portion having a rectangular or substantially rectangular cross section, which is recessed from the atmosphere-side surface of the atmosphere-side portion 22b toward the atmosphere-side surface of the atmosphere-side flange 12 of the reinforcing ring 10 at the center portion in the radial direction of the atmosphere-side portion 22 b. The atmosphere-side positioning portion 26 is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis X1.
The seal lip 30 has: a main seal lip 40 extending from an inner peripheral end of the elastic body portion 20 at least toward the sealing target liquid side; and a seal target liquid side seal lip 50 extending from a seal target liquid side end portion of the main seal lip 40 at least toward the seal target liquid side. The main seal lip 40 has a plurality of protrusions 41 formed in the circumferential direction and inclined with respect to the axis X1 on the inner circumferential side surface thereof.
Specifically, the main seal lip portion 40 extends from the inner peripheral end portion of the sealing target liquid side portion 21a of the sealing target liquid side elastic body portion 21 toward the sealing target liquid side toward the inner peripheral side, and has a lip tip portion 42 at the tip thereof. The lip tip 42 is a wedge-shaped annular or substantially annular lip having a cross-sectional shape protruding toward the inner peripheral side, and is formed to slide with the inner peripheral member 102 (fig. 3). Further, a garter spring 43 is fitted to the outer peripheral side of the lip tip portion 42, and the garter spring 43 presses the lip tip portion 42 radially inward.
The plurality of protrusions 41 are arranged at the same or substantially the same angular intervals in the circumferential direction on the inner circumferential side surface of the main seal lip 40 at the same or substantially the same circumference, and are arranged at the same or substantially the same intervals. The plurality of projections 41 extend from the tip of the lip tip 42 of the main seal lip 40 obliquely to the atmosphere with respect to the rotation direction of the inner peripheral member 102 (fig. 3) at predetermined intervals. The plurality of protrusions 41 are each formed in a bottom shape or a substantially bottom shape.
The sealing target liquid side sealing lip 50 extends from the sealing target liquid side end of the main sealing lip 40 toward the sealing target liquid side toward the inner peripheral side, and is formed in a truncated cone shape or a substantially truncated cone shape, and has a lip tip portion 51 at its tip. The lip tip portion 51 is a wedge-shaped annular or substantially annular lip having a cross-sectional shape protruding toward the inner peripheral side, and is formed to slide with the inner peripheral member 102 (fig. 3).
The sealing-target-liquid-side sealing lip 50 has at least 1 protruding portion 60 extending from the outer peripheral side surface toward the outer peripheral side on the outer peripheral side surface. The projections 60 are protrusions having a triangular or substantially triangular cross section extending from the center portion of the outer peripheral side surface of the sealing target liquid side sealing lip 50 toward the sealing target liquid side, and are formed in a concentric or substantially concentric shape at equal angular intervals or substantially equal angular intervals from the axis X1. The plurality of protrusions 60 are each formed in a triangular prism shape or a substantially triangular prism shape, and extend on the same or substantially the same circumference at a predetermined interval G. The sealing target liquid side surface of the protrusion 60 is flush with the sealing target liquid side surface of the sealing target liquid side sealing lip 50.
A length L1 from the root of the sealing object liquid side seal lip 50 to the tip of the sealing object liquid side seal lip 50 is longer than a length L2 from the root of the sealing object liquid side seal lip 50 to the tip of the main seal lip 40. Specifically, the length L1 from the root of the sealing-target liquid side seal lip 50 to the tip of the sealing-target liquid side seal lip 50 is the length (width) from the atmospheric air side end of the inner peripheral side surface of the sealing-target liquid side seal lip 50 formed in an annular or substantially annular shape around the axis X1 to the sealing-target liquid side. The length L2 from the root of the seal target liquid side seal lip 50 to the tip of the main seal lip 40 is the length (width) from the seal target liquid side to the air side end of the inner peripheral side surface on the seal target liquid side of the lip tip 42 of the main seal lip 40 formed in an annular or substantially annular shape around the axis X1.
The inner peripheral side surface of the sealing object liquid side sealing lip 50 has a plurality of protrusions 52 formed in the circumferential direction and obliquely formed with respect to the direction of the axis X1. The plurality of protrusions 52 are arranged at equal angular intervals or substantially equal angular intervals in the circumferential direction and at equal pitch intervals or substantially equal pitch intervals on the same or substantially the same circumference on the inner circumferential side surface of the sealing target liquid side sealing lip 50. The plurality of projections 52 extend from the tip of the lip tip 51 of the sealing-target liquid-side sealing lip 50 toward the atmosphere, are inclined obliquely with respect to the rotation direction of the inner peripheral member 102 (fig. 3), and extend at predetermined intervals. The plurality of projections 52 are each formed in a bottom shape or a substantially bottom shape.
The dust lip portion 23 is a truncated cone-shaped or substantially truncated cone-shaped lip extending toward the inner peripheral side from the inner peripheral end portion of the liquid-side-to-be-sealed portion 21a of the liquid-side elastic body portion 21 toward the atmosphere side, and is formed to slide with the inner peripheral member 102 (fig. 3).
Next, a sealing structure 100 in which the sealing device 1 is assembled will be described. Fig. 3 is a sectional view showing a schematic structure of a seal structure 100 in a state where the sealing device 1 according to the embodiment of the present invention is assembled to a sealing target. In fig. 3, only a single-sided portion of the sealing arrangement 100 and the sealing device 1 is shown. The seal structure 100 is configured such that the seal device 1 is incorporated into an annular gap between an outer peripheral member 101 and an inner peripheral member 102, which are annular and at least partially surrounded by the outer peripheral member 101, the outer peripheral member 101 and the inner peripheral member 102 being relatively rotatable with respect to each other on an axis X1, and the annular gap between the outer peripheral member 101 and the inner peripheral member 102 is sealed.
The inner peripheral member 102 is a rotary shaft extending parallel or substantially parallel to the direction of the axis X1 and formed into a cylindrical rod or a substantially cylindrical rod about the axis X1. The outer peripheral member 101 is disposed on the outer peripheral side of the inner peripheral member 102, and a cylindrical or substantially cylindrical opening 103 is formed in the outer peripheral member 101 around the axis X1.
The inner peripheral member 102 is inserted into the opening 103 of the outer peripheral member 101, and an annular space is formed between the opening 103 and the inner peripheral member 102. The sealing device 1 is fixed to the opening 103 of the outer peripheral member 101 by, for example, fitting and closing the outer peripheral lip 25 of the outer peripheral portion 22d of the atmosphere-side elastic body portion 22 of the elastic body portion 20. The main seal lip 40 and the seal-target liquid side seal lip 50 of the elastic body portion 20 of the sealing device 1 slide on the outer peripheral side surface of the inner peripheral member 102.
Thus, in the sealing device 1, the sealing lip 30 has: a main seal lip 40 extending from an inner peripheral end of the elastic body portion 20 at least toward the sealing target liquid side; and a seal target liquid side seal lip 50 extending from a seal target liquid side end portion of the main seal lip 40 at least toward the seal target liquid side. The sealing-target-liquid-side sealing lip 50 has at least 1 protruding portion 60 extending from the outer peripheral side surface toward the outer peripheral side on the outer peripheral side surface. Therefore, even when the leading end of the sealing target liquid side sealing lip 50 is rolled up toward the atmosphere side and the sealing target liquid side sealing lip 50 is rolled up in the entire circumferential direction, a gap can be generated between the sealing target liquid side sealing lip 50 and the inner peripheral member 102 by at least 1 of the protruding portions 60. Therefore, in the sealing device 1, by checking the flow of air leaking through the sealing device 110 by the oil leakage checking device, the air leakage can be detected to detect the rollover of the sealing target liquid side seal lip 50, and the rollover of the sealing target liquid side seal lip 50 can be more easily detected.
In the sealing device 1, the plurality of protrusions 60 are protrusions having a triangular or substantially triangular cross section extending from the central portion of the outer peripheral side surface of the sealing target liquid side sealing lip 50 toward the sealing target liquid side and are formed at equal angular intervals or substantially equal angular intervals concentrically or substantially concentrically from the axis X1. Therefore, even when the sealing-target liquid side seal lip 50 is curled over the entire circumference, a gap is generated due to the gap G between the plurality of protrusions 60. Therefore, in the sealing device 1, the air leakage can be detected to detect the rollover of the sealing target liquid side seal lip 50, and the rollover of the sealing target liquid side seal lip 50 can be more easily detected.
In addition, in the sealing device 1, the length L1 from the root of the sealing-target liquid side seal lip 50 to the tip of the sealing-target liquid side seal lip 50 is longer than the length L2 from the root of the sealing-target liquid side seal lip 50 to the tip of the main seal lip 40. Therefore, when the sealing-target liquid side seal lip 50 is turned over, it can easily bite into the main seal lip 40 to generate a gap between the main seal lip 40 and the inner peripheral side member 102.
Further, in the sealing device 1, the main seal lip 40 has a plurality of protrusions 41 formed in the circumferential direction and obliquely formed with respect to the direction of the axis X1 on the inner peripheral side surface thereof. Further, the inner peripheral side surface of the sealing object liquid side sealing lip 50 has a plurality of protrusions 52 formed in the circumferential direction and obliquely formed with respect to the direction of the axis X1. Therefore, a slight amount of the liquid to be sealed is allowed to leak at the time of standstill, and the liquid to be sealed is supplied to the main seal lip 40, whereby the lubrication state of the main seal lip 40 can be maintained well. Further, when the inner peripheral side member 102 rotates, the pumping action of the plurality of projections 52 of the sealing target liquid side sealing lip 50 prevents the leakage of the sealing target liquid from the plurality of projections 52, and further, the pumping action of the plurality of projections 41 of the main sealing lip 40 prevents the leakage of the sealing target liquid to the atmosphere side.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all embodiments included in the concept of the present invention and the claims. In order to achieve at least part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. For example, the shape, material, arrangement, size, and the like of each component in the above embodiments may be appropriately changed according to a specific use mode of the present invention.
For example, in the sealing device 1 according to the embodiment of the present invention, the protrusion 60 is a convex portion having a triangular or substantially triangular cross section extending toward the outer peripheral side from the central portion of the outer peripheral side surface of the sealing target liquid side sealing lip 50 toward the sealing target liquid side, and a plurality of protrusions are formed at equal angular intervals or substantially equal angular intervals in a concentric or substantially concentric manner from the axis line X1, and the embodiment of the present invention is described as an example. However, the present invention is not limited to this, and the number of the protruding portions 60 is only 1, and the position, number, and size of the protruding portions may be any position, number, and size as long as they are formed on the outer peripheral side surface of the liquid side sealing lip to be sealed.
In the sealing device 1 according to the embodiment of the present invention, the plurality of protrusions 41 are provided on the inner peripheral side surface of the main seal lip 40, and the plurality of protrusions 52 are provided on the inner peripheral side surface of the sealing target liquid side seal lip 50. However, the present invention is not limited to this, and the main seal lip 40 may not have the plurality of protrusions 41, and the seal-target liquid side seal lip 50 may not have the plurality of protrusions 52.
Description of the reference numerals
1: sealing device
10: reinforcing ring
20: elastomer part
30: sealing lip
40: main sealing lip
50: liquid side sealing lip of sealing object
60: projection part
100: sealing structure
101: outer peripheral side member
102: inner peripheral member
X1: axial line
Claims (3)
1. A sealing device for sealing between an annular outer peripheral member and an annular inner peripheral member at least partially surrounded by the outer peripheral member, the sealing device being relatively rotatable on an axis, the sealing device comprising:
a reinforcing ring in a ring shape centered on the axis; and
an annular elastic body portion made of an elastic body, attached to the reinforcing ring with the axis as the center, and provided with a seal lip portion that slides with the inner peripheral member,
the sealing lip has: a main seal lip portion extending from an inner circumferential end portion of the elastic body portion at least toward a sealing target liquid side; and a seal target liquid side seal lip portion extending from a seal target liquid side end portion of the main seal lip portion at least toward the seal target liquid side,
the liquid side seal lip has at least 1 protruding portion on an outer peripheral side surface thereof, and the protruding portion extends from the outer peripheral side surface toward an outer peripheral side.
2. The sealing device of claim 1,
the protruding portion is a convex portion having a triangular cross section and extending toward the outer peripheral side from the central portion of the outer peripheral side surface of the seal lip on the liquid-to-be-sealed side toward the liquid-to-be-sealed side, and a plurality of the protruding portions are formed concentrically from the axis line at equal angular intervals.
3. The sealing device according to claim 1 or 2,
the length from the root of the seal-target liquid side seal lip to the tip of the seal-target liquid side seal lip is longer than the length from the root of the seal-target liquid side seal lip to the tip of the main seal lip.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019128624 | 2019-07-10 | ||
| JP2019-128624 | 2019-07-10 | ||
| PCT/JP2020/021054 WO2021005908A1 (en) | 2019-07-10 | 2020-05-28 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113710933A true CN113710933A (en) | 2021-11-26 |
Family
ID=74115195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080029436.7A Pending CN113710933A (en) | 2019-07-10 | 2020-05-28 | Sealing device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2021005908A1 (en) |
| CN (1) | CN113710933A (en) |
| WO (1) | WO2021005908A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2569569Y2 (en) * | 1991-09-30 | 1998-04-28 | エヌオーケー株式会社 | Sealing device |
| JPH0643422U (en) * | 1992-11-13 | 1994-06-10 | エヌオーケー株式会社 | Sealing device |
| JP3007446U (en) * | 1994-08-03 | 1995-02-14 | 株式会社荒井製作所 | Oil seal |
| JP4502108B2 (en) * | 2003-06-26 | 2010-07-14 | Ｎｏｋ株式会社 | Sealing device |
-
2020
- 2020-05-28 JP JP2021530520A patent/JPWO2021005908A1/ja active Pending
- 2020-05-28 CN CN202080029436.7A patent/CN113710933A/en active Pending
- 2020-05-28 WO PCT/JP2020/021054 patent/WO2021005908A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2021005908A1 (en) | 2021-01-14 |
| WO2021005908A1 (en) | 2021-01-14 |
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