Sealed structure

Abstract

A sealing device (1) comprises an annular reinforcing ring (10) encircling an axis x, and an annular elastic body section (20) encircling the axis x and formed from an elastic body attached to the reinforcing ring (10), the elastic body section (20) having an outer peripheral side part (23) that covers the reinforcing ring (10) from an outer peripheral side c, and an annular seal lip part (21) that protrudes from the outer peripheral side part (23) toward one side (inner side b) in the direction of the axis x. The elastic body section (20) has an annular sub-lip part (22) that protrudes from the outer peripheral side part (23) toward the other side (outer side a) in the direction of the axis x. The seal lip part (21) protrudes to one side of the reinforcing ring (10) in the direction of the axis x, and protrudes to the outer peripheral side c of the reinforcing ring (10) in a radial direction.

Description

[Technical field]

[0001] The present invention relates to a sealing device. [Background technology]

[0002] Conventionally, gaskets have been known as sealing devices for sealing gaps between multiple opposing members that cannot move relative to each other, such as a housing and a cover. The gasket is attached to an annular space, such as an annular groove, formed between multiple members. Such a gasket forms a sealing structure together with the member to which it is applied that forms the annular space to which it is attached. As such a gasket, a gasket has been disclosed that has a cylindrical reinforcing ring that extends in the axial direction of the ring around an axis, and an elastic body part made of an elastic body attached to the reinforcing ring, and the elastic body part has a pair of lip parts that extend along the axis from both ends in the axial direction of the reinforcing ring (see, for example, Patent Document 1).

[0003] In recent years, gaskets have been designed to be smaller and lighter in the components to which they are applied. This has resulted in smaller cross sections for the gaskets themselves, and thinner and more resinous components for which they are applied. The smaller cross sections of the gaskets and thinner and more resinous components for which they are applied reduce the size of the annular space in which the gasket is attached, and increase the relative variation in the dimensions of the space due to manufacturing. With such gaskets, it is conceivable that the intended sealing performance of the gasket may not be achieved due to the variation in the dimensions of the annular space in which they are attached. Technologies for dealing with such cases have also been disclosed (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-32834 [Patent Document 2] International Publication No. 2015 / 137491 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as in the technology of Patent Document 2, depending on the dimensions of the annular space and the lip portion, there are cases where the intended sealing performance cannot be obtained. In other words, there is room for improvement in the sealing performance of the conventional sealing device.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a sealing device capable of improving sealing performance. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the sealing device of the present invention is a sealing device for sealing an annular space formed by a plurality of components, and comprises a reinforcing ring annular about an axis, and an elastic body portion annular about the axis formed from an elastic body attached to the reinforcing ring, the elastic body portion having an outer peripheral side portion covering the reinforcing ring from the outer peripheral side, an annular seal lip portion protruding from the outer peripheral side portion toward one side in the axial direction, and an annular secondary seal portion protruding from the outer peripheral side portion toward the other side in the axial direction, and the seal lip portion protruding toward the one side of the reinforcing ring in the axial direction and protruding toward the outer peripheral side of the reinforcing ring in the radial direction.

[0008] In the sealing device according to one aspect of the present invention, the seal lip portion has an interference with the plurality of members in the radial direction.

[0009] In the sealing device according to one aspect of the present invention, the seal lip portion protrudes toward the outer circumferential side portion in the radial direction.

[0010] In the sealing device according to one aspect of the present invention, the seal lip portion has an interference with the plurality of members in the axial direction.

[0011] In the sealing device according to one aspect of the present invention, the sub-lip portion protrudes toward the other side of the reinforcing ring in the axial direction. Effect of the Invention

[0012] According to the sealing device of the present invention, the sealing performance can be improved. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view taken along an axis of a sealing device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a cross section taken along an axis, for illustrating the difference in shape between the sealing device shown in FIG. 1 and the mounting space of a sealing structure to which the sealing device is mounted. [Diagram 3] 2 is a cross-sectional view showing a state in which the sealing device shown in FIG. 1 is used. [Figure 4] 4 is a cross-sectional view taken along the axis of a sealing device according to a reference example. FIG. [Diagram 5] 5 is a cross-sectional view showing a state in which the sealing device according to the reference example shown in FIG. 4 is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] FIG. 1 is a cross-sectional view of a sealing device 1 according to an embodiment of the present invention, taken along an axis x.

[0016] For ease of explanation, the direction of arrow a (see FIG. 1) in the direction of axis x (one side in the axial direction) is defined as the outer side, and the direction of arrow b (see FIG. 1) in the direction of axis x (the other side in the axial direction) is defined as the inner side. Also, in the direction perpendicular to axis x (hereinafter also referred to as the "radial direction"), the direction away from axis x (the direction of arrow c in FIG. 3) is defined as the outer periphery side, and the direction approaching axis x (the direction of arrow d in FIG. 3) is defined as the inner periphery side.

[0017] As shown in Fig. 1, a sealing device 1 according to an embodiment of the present invention includes a reinforcing ring 10 that is annular about an axis x, and an elastic body portion 20 that is annular about the axis x and is formed of an elastic body attached to the reinforcing ring 10. The elastic body portion 20 includes an outer peripheral side portion 23 that is a portion that covers the reinforcing ring 10 from an outer peripheral side c, and a portion that extends in the direction of the axis x from the outer peripheral side portion 23. On the other hand The elastic body portion 20 has a seal lip 21 which is an annular portion protruding toward the outer circumferential side portion 23 in the direction of the axis x. on the other hand and a secondary lip portion 22 which is an annular portion protruding toward the outer circumferential side (outside a). The seal lip 21 protrudes toward one side beyond the reinforcing ring 10 in the direction of the axis x, and protrudes toward the outer circumferential side c beyond the reinforcing ring 10 in the radial direction which is perpendicular to the direction of the axis x. The sealing device 1 will be specifically described below.

[0018] As shown in FIG. 1, the reinforcing ring 10 is a tubular member extending along the axis x. The reinforcing ring 10 is, for example, a cylindrical or approximately cylindrical member with the axis x as its central axis or approximately central axis. The reinforcing ring 10 has a reinforcing ring outer end 12 which is an end of the inner side b, and a reinforcing ring outer end 12 which is an end of the outer side a. The reinforcing ring 10 is a member that reinforces the elastic body portion 20. The reinforcing ring 10 is formed, for example, from a metal material. Examples of the metal material of the reinforcing ring 10 include stainless steel and SPCC (cold rolled steel). When the reinforcing ring 10 is formed from a resin material, examples of the resin material include nylon 66 (PA66) and polyphenylene sulfide (PPS) resin.

[0019] The elastic body portion 20 is formed so as to cover the reinforcing ring 10. As described above, the elastic body portion 20 has the seal lip portion 21, the sub-lip portion 22, and the outer peripheral side portion 23. The elastic body portion 20 also has a base portion 24 which is a portion on the inner peripheral side d of the outer peripheral side portion 23. The base portion 24 is a portion which covers the reinforcing ring 10 from the inner peripheral side d. The seal lip portion 21 and the sub-lip portion 22 each extend from the base portion 24. Specifically, the seal lip portion 21 extends from an inner end portion (base inner end 24b) of the base portion 24. The sub-lip portion 22 extends from an outer end portion (base outer end 24a) of the base portion 24.

[0020] As shown in FIG. 1, the outer peripheral side portion 23 is a portion that covers the reinforcing ring 10 from the outer peripheral side c. The outer peripheral side portion 23 has an outer peripheral side outer end 23a, which is an end portion on the outer side a, connected to the sub-lip portion 22. The outer peripheral side portion 23 has an outer peripheral side inner end 23b, which is an end portion on the inner side b, connected to the seal lip portion 21. The outer peripheral side portion 23 also has a shoulder portion 23c at the outer peripheral side outer end 23a that is connected to the sub-lip portion 22. The shoulder portion 23c forms a corner portion on the outer peripheral side. The shoulder portion 23c is a portion defined by an annular surface facing the outer side a and an outer peripheral surface portion 23d, which is a cylindrical surface facing the outer peripheral side c.

[0021] The seal lip portion 21 obliquely protrudes from the outer circumferential side inner end 23b and the base inner end 24b toward the inside (arrow b direction) and the outer circumferential side (arrow c direction). The seal lip portion 21 expands in diameter, for example, toward the inside b in the direction of the axis x. The degree of expansion of the seal lip portion 21 is not particularly limited. The seal lip portion 21 is a conical or substantially conical cylindrical shape with the axis x as its central axis or substantially central axis. The seal lip portion 21 protrudes toward the inside b from the reinforcing ring inner end 11. The seal lip portion tip 21a, which is the end of the inner b of the seal lip portion 21, is located on the inside b from the reinforcing ring inner end 11 in the direction of the axis x. The elastic body portion 20 of the sealing device 1 may be formed so as to expand in diameter from the outer circumferential surface portion 23d of the outer circumferential side portion 23 toward the seal lip portion tip 21a. Furthermore, the elastic body portion 20 of the sealing device 1 may have a constant degree of diameter expansion from the outer peripheral surface portion 23d of the outer peripheral side portion 23 toward the seal lip portion tip 21a. Furthermore, the elastic body portion 20 may have a different degree of diameter expansion at each portion from the outer peripheral surface portion 23d toward the seal lip portion tip 21a. The seal lip portion tip 21a is thinner than the seal lip portion root 21b. The seal lip portion root 21b is a portion that connects to the base portion 24. The seal lip portion 21 may become thinner, for example, from the seal lip portion root 21b toward the seal lip portion tip 21a.

[0022] FIG. 2 is a schematic diagram of a cross section along the axis x1 to show the difference in shape between the sealing device 1 and the mounting space S of the sealing structure to which the sealing device 1 is attached. In FIG. 2, the sealing device 1 and the mounting space S are overlapped in a cross section along the axis x1 to show the difference in shape and size between the sealing device 1 and the mounting space S to which the sealing device 1 is attached. As shown in FIG. 2, in the sealing device 1, the length of the elastic body portion 20 including the seal lip portion 21 and the sub-lip portion 22 in the axial x direction is longer than the length of the mounting space S. The seal lip portion 21 has a seal lip portion tip 21a that protrudes inward b from the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23 in the axial x direction. In addition, the seal lip portion 21 protrudes radially toward the outer circumferential side c from the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23. In other words, the seal lip portion 21 has a length and an outer peripheral surface that come into contact with the inner seal surface 113b, which is the seal surface on the inner side b, and the outer peripheral wall surface 113a, which is the seal surface on the outer peripheral side c, with a predetermined interference in a usage state described below. Note that the length of the seal lip portion 21 is the width in the extension direction (projection direction) of the seal lip portion 21.

[0023] The sub-lip portion 22, for example, as shown in FIG. 1, protrudes obliquely from the base outer end 24a toward the outside (arrow a direction) and the inner circumferential side (arrow d direction). Specifically, the sub-lip portion 22 is a portion whose diameter decreases toward the outside a in the direction of the axis x. The sub-lip portion 22 is a conical or substantially conical cylindrical portion whose central axis is the axis x. The sub-lip portion 22 protrudes toward the outside a from the reinforcement ring outer end 12. The sub-lip portion tip 22a, which is the end of the outside a of the sub-lip portion 22, is located outside a from the reinforcement ring outer end 12 in the direction of the axis x. The sub-lip portion tip 22a is thinner than the sub-lip portion root 22b, which is a portion connected to the base portion 24. The sub-lip portion 22 becomes thinner, for example, from the sub-lip portion root 22b toward the sub-lip portion tip 22a. The sub-lip portion 22 has a length such that it contacts the seal surface of the outside a with a predetermined interference in a usage state described later.

[0024] The sub-lip portion 22 may also be an annular convex portion protruding from the base outer end 24a of the base 24 to the outside a. Specifically, the sub-lip portion 22 is an annular or approximately annular convex portion centered or approximately centered on the axis x. In this case as well, the sub-lip portion 22 protrudes outward a beyond the reinforcing ring outer end 12. Furthermore, the sub-lip portion tip 22a, which is the end of the outside a of the sub-lip portion 22, is located outward a beyond the reinforcing ring outer end 12 in the direction of the axis x. The sub-lip portion 22 is formed so as to contact the inner sealing surface with a predetermined squeeze margin in a usage state described later.

[0025] As shown in Fig. 1, the elastic body portion 20 does not cover the reinforcing ring outer end 12. The elastic body portion 20 may be flush with the reinforcing ring outer end 12 in the radial direction. The elastic body portion 20 does not have to be flush with the reinforcing ring outer end 12 in the radial direction. The elastic body portion 20 may also cover the reinforcing ring outer end 12. In this case, the sub-lip portion tip 22a is formed so as to be located outward a from the portion of the elastic body portion 20 that covers the reinforcing ring outer end 12 in the direction of the axis x.

[0026] The elastic body of the elastic body portion 20 may be, for example, various rubber materials. Examples of the various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM).

[0027] The reinforcing ring 10 is manufactured by, for example, pressing or forging. The elastic body portion 20 is molded by crosslinking (vulcanization) molding using a mold. During this crosslinking molding, the reinforcing ring 10 is placed in the mold. The elastic body portion 20 is bonded to the reinforcing ring 10 by crosslinking adhesion. Through the above steps, the elastic body portion 20 and the reinforcing ring 10 are molded integrally.

[0028] Next, a state in which the above-mentioned sealing device 1 is used will be described. FIG. 3 is a cross-sectional view showing a state in which the sealing device 1 is used. As shown in FIG. 3, the sealing device 1 is attached to a mounting space S, which is an annular space, and is in a state of use. The mounting space S is, for example, a circular or approximately circular space around an axis x1 formed by a cover 100 and a housing 110 as a plurality of members. The cover 100 is formed with a through hole 101. The housing 110 is formed with a through hole 111 to which the cover 100 is fixed. A groove portion 113 that forms an annular groove around the through hole 111 is formed on the housing surface 112. The groove portion 113 is defined by an outer peripheral wall surface 113a and an inner seal surface 113b. The outer peripheral wall surface 113a extends in a cylindrical or approximately cylindrical shape in the direction of the axis x1. The inner seal surface 113b is an annular flat surface that extends from the inner end of the outer peripheral wall surface 113a toward the inner peripheral side to the through hole 111.

[0029] The cover 100 is fixed to the housing 110 so that the cover surface 102 faces the housing surface 112. The cover 100 is fixed to the housing 110 so that the through hole 101 is coaxial or approximately coaxial with the through hole 111 of the housing 110. The through hole 101 and the through hole 111 communicate with each other to form one through pipe 120. In the cover surface 102, the annular flat surface is the outer seal surface 102a. The outer seal surface 102a faces the inner seal surface 113b of the housing 110 in the direction of the axis x1. The mounting space S is an annular space defined by the outer seal surface 102a, the outer peripheral wall surface 113a, and the inner seal surface 113b. The sealing device 1 is attached to the mounting space S to seal the mounting space S. The sealing device 1 seals the through pipe 120 formed by the through hole 101 and the through hole 111.

[0030] In a used state, the sealing device 1 is attached to the installation space S coaxially or approximately coaxially with the installation space S. That is, in a used state, the axis x and the axis x1 of the sealing device 1 shown in FIG.

[0031] The reinforcing ring outer end 12 contacts the outer seal surface 102a. The secondary lip portion 22 is pressed against the outer seal surface 102a and contacts the outer seal surface 102a with a predetermined interference or squeeze.

[0032] As described above, in the sealing device 1, the length of the elastic body portion 20 including the seal lip portion 21 and the sub-lip portion 22 is longer than the length of the mounting space S in the axial x direction. Therefore, as shown in FIG. 3, the elastic body portion 20 of the sealing device 1 is sandwiched and compressed between the cover 100 and the housing 110 in the use state. The seal lip portion 21 protrudes toward the inner side b from the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23 in the axial x direction. Therefore, the seal lip portion 21 has the seal lip portion tip 21a pressed toward the outer side a by the inner seal surface 113b. That is, the seal lip portion 21 contacts the inner seal surface 113b with a predetermined range of interference from the seal lip portion tip 21a in the axial x direction.

[0033] The seal lip portion 21 protrudes radially toward the outer circumferential side c beyond the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23. The seal lip portion 21 has a seal lip portion tip 21a that contacts the outer circumferential wall surface 113a. Outer circumference side c That is, the seal lip portion 21 contacts the outer peripheral wall surface 113a and the outer peripheral wall surface 113a with a predetermined range of interference from the seal lip portion tip 21a in the radial direction.

[0034] As described above, the seal lip portion 21 can come into contact with the inner seal surface 113b, which is the seal surface on the inner side b, and the outer circumferential wall surface 113a, which is the seal surface on the outer circumferential side c, with a predetermined interference when in use. Here, the seal lip portion 21 is longer than the sub lip portion 22. For this reason, the seal lip portion 21 can come into contact with the inner seal surface 113b with a relatively large interference when in use, as shown in FIG.

[0035] Therefore, even if there is variation in the dimensions of the mounting space S of the sealing device 1, the seal lip portion 21 absorbs this variation. The variation in the dimensions of the mounting space S is, for example, the variation in the width dimension in the axis x1 direction (the distance between the inner seal surface 113b and the outer seal surface 102a). This allows the sealing device 1 to maintain a contact state with the outer peripheral wall surface 113a and the inner seal surface 113b. This also allows the sub-lip portion 22 to be maintained in a state pressed against the outer seal surface 102a. This also allows the sub-lip portion 22 to maintain a contact state with the outer seal surface 102a.

[0036] In this way, by being attached to the mounting space S in an intended orientation, the sealing device 1 can properly seal the mounting space S even if the dimensions of the mounting space S vary.

[0037] Fig. 4 is a cross-sectional view taken along the axis x of the sealing device 2 according to the reference example, and Fig. 5 is a cross-sectional view showing the sealing device 2 according to the reference example in use.

[0038] As shown in FIG. 4, the sealing device 2 according to the reference example is different from the sealing device 1 according to the above-mentioned embodiment in the position where the seal lip portion is provided in the elastic body portion 220. The sealing device 2 according to the reference example is different from the sealing device 1 in the shapes of the seal lip portion 221 and the sub-lip portion 222. Specifically, the seal lip portion 221 obliquely protrudes from the outer end 224a of the base portion 224 toward the outside (arrow a direction) and the inner circumferential side (arrow d direction). For example, the seal lip portion 221 is reduced in diameter toward the inner circumferential side d as it moves toward the outside a in the axis x direction. The seal lip portion 221 is a part having a conical or substantially conical cylindrical shape with the axis x as the central axis or the substantially central axis. For example, the sub-lip portion 222 obliquely protrudes from the inner end 224b of the base portion 224 toward the inside (arrow b direction) and the inner circumferential side (arrow d direction).

[0039] 5, in the sealing device 2, in a used state, the seal lip portion 221 is pressed inward by the outer seal surface 202a of the cover surface 202. The seal lip portion 221 is in contact with the outer seal surface 202a with a predetermined range of interference from the tip 221a. The sub-lip portion 222 is pressed against the inner seal surface 213b of the housing surface 212 and in contact with the inner seal surface 213b with a predetermined interference or squeeze.

[0040] The sealing device 2 according to the reference example as described above is formed such that the seal lip portion 221 is reduced in diameter toward the inner circumferential side d as it moves toward the outer side a in the direction of the axis x. Therefore, in a usage state, the tip 221a of the seal lip portion 221 moves toward the inner circumferential side d along the outer seal surface 202a due to the elastic force of the elastic body portion 20. In such a usage state, the sealing device 2 according to the reference example may not be able to obtain the intended sealing performance because the tip 221a of the seal lip portion 221 moves from the outer seal surface 202a. In particular, in a usage state, when the sealing device 2 according to the reference example has a variation in the width dimension in the direction of the axis x1 in the mounting space S (the interval between the inner seal surface 113b and the outer seal surface 102a), the pressing force of the seal lip portion 221 or the sub-lip portion 222 against the seal surface is insufficient. That is, in the sealing device 2, the pressing force of the seal lip portion 221 against the outer seal surface 202a or the pressing force of the sub-lip portion 222 against the inner seal surface 213b is insufficient. As a result, in the sealing device 2, the seal lip portion 221 moves from the outer seal surface 202a, and the intended sealing performance may not be obtained.

[0041] Moreover, the sealing device 2 according to the reference example does not have a portion that contacts the outer circumferential wall surface 213a of the housing surface 212 on the outer circumferential side c, such as the seal lip portion 221. For this reason, the sealing device 2 may not be able to obtain the intended sealing performance on the outer circumferential side c.

[0042] On the other hand, the sealing device 1 is formed such that the seal lip portion 21 protrudes inward b further than the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23 in the direction of the axis x. Therefore, the seal lip portion 21 has a seal lip portion tip 21a that presses the inner seal surface 113b toward the outside a. Also, the sealing device 1 is formed such that the seal lip portion 21 protrudes radially toward the outer circumferential side c further than the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23. Therefore, the seal lip portion tip 21a presses the outer circumferential wall surface 113a. Outer circumference side c That is, in the sealing device 1, the elastic force of the elastic body portion 20 causes the seal lip portion tip 21a to move toward the corner portion 113c where the inner seal surface 113b and the outer circumferential wall surface 113a of the housing 110 are joined. Therefore, the sealing device 1 can improve the sealing performance by suppressing the seal lip portion tip 21a from moving away from the inner seal surface 113b.

[0043] Moreover, according to the sealing device 1, when there is variation in the width dimension (the distance between the inner seal surface 113b and the outer seal surface 102a) in the axis x1 direction in the mounting space S in a used state, it is possible to suppress a shortage of the pressing force of the seal lip portion 21 or the sub-lip portion 22 against the seal surface. Specifically, the sealing device 1 can suppress a shortage of the pressing force of the seal lip portion 21 against the outer seal surface 102a or the pressing force of the sub-lip portion 22 against the inner seal surface 113b.

[0044] That is, according to the sealing device 1, it is possible to suppress the seal lip portion 21 from moving from the outer seal surface 102a, which would cause the intended sealing performance to be lost, and thus it is possible to exert a stable sealing performance.

[0045] In the sealing device 1, the seal lip portion 21 is formed to protrude radially toward the outer circumferential side c beyond the reinforcing ring 10 and the outer circumferential surface portion 23d of the outer circumferential side portion 23, so that the seal lip portion tip 21a presses the outer circumferential wall surface 113a toward the inner circumferential side d. Therefore, according to the sealing device 1, the contact area of ​​the seal lip portion 21 is increased, thereby improving the sealing performance.

[0046] Furthermore, in the sealing device 1, the seal lip portion 21 contacts the inner seal surface 113b and the outer circumferential wall surface 113a with a predetermined interference when in use. Therefore, the sealing device 1 can exert a centering effect in which the elastic force of the elastic body portion 20 is exerted toward the corner portion 113c of the housing 110 by various forces such as vibration when in use. Therefore, the sealing device 1 can suppress the occurrence of a gap between the housing 110.

[0047] As described above, according to the sealing device 1 according to the embodiment of the present invention, it is possible to improve the sealing performance.

[0048] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment of the present invention, and includes all aspects included in the concept and scope of the claims of the present invention. In addition, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be appropriately changed depending on the specific use mode of the present invention. [Explanation of symbols]

[0049] 1...sealing device, 10...reinforcing ring, 11...reinforcing ring inner end, 12...reinforcing ring outer end, 20...elastic body portion, 21...seal lip portion, 21a...seal lip portion tip, 21b...seal lip portion root, 22...sub-lip portion, 22a...sub-lip portion tip, 22b...sub-lip portion root, 23...outer peripheral side portion, 23a...outer peripheral side portion outer end, 23b...outer peripheral side portion inner end, 23c...shoulder portion, 23d...outer peripheral surface portion, 24...base portion, 24a...base outer end, 24b...base inner end, 100...cover, 101...through hole, 102...cover surface, 102a...outer seal surface, 110...housing, 111...through hole, 112...housing surface, 113...groove portion, 113a...outer peripheral wall surface, 113b...inner seal surface, 113c...corner portion, 120...through pipe

Claims

[Claim 1] a cover, a housing, and a sealing device for sealing an annular space formed by fixing an outer surface of the housing and an inner surface of the cover to each other without any gap; A sealing structure comprising: the annular space is defined by an outer peripheral wall surface that is cylindrically extending in the axial direction defined by the housing, an inner seal surface that is an annular flat surface that extends from an inner end of the outer peripheral wall surface toward an inner peripheral side to a through hole of the housing, and an outer seal surface that is an annular flat surface defined by the cover, The sealing device is A reinforcing ring annularly formed around the axis; an elastic body portion having an annular shape around the axis and formed of an elastic body attached to the reinforcing ring; The elastic body portion is the reinforcing ring has an outer circumferential side portion covering the reinforcing ring from an outer circumferential side, an annular seal lip portion protruding inward in the axial direction from the outer circumferential side portion, and an annular sub-lip portion protruding outward in the axial direction from a base portion covering the reinforcing ring from an inner circumferential side, The reinforcing ring has an outer end contacting the outer seal surface, The outer circumferential side portion contacts the outer circumferential wall surface in a usage state, The seal lip portion protrudes radially so as to be enlarged toward the outer periphery side more than the outer periphery side portion, and has a length in the axial direction longer than the sub-lip portion, and protrudes toward the inside of the reinforcing ring with a length such that in a used state the seal lip portion contacts the inner seal surface in the axial direction with a predetermined interference, and protrudes outer periphery than the reinforcing ring with a length such that in a used state the seal lip portion contacts the outer periphery wall surface in the radial direction with a predetermined interference. As a result, a tip of the seal lip portion is formed so as to press the inner seal surface toward a corner where the inner seal surface and the outer periphery wall surface are joined to maintain a contact state with the inner seal surface, The secondary lip portion is configured to press against the outer seal surface to maintain contact with the outer seal surface. Sealed structure.

Images