Sealing device

Abstract

Reduce the rotational torque. The annular sealing device (1) is installed in the annular groove (210) provided on the outer periphery of the shaft (200) to seal the annular space (S) between the relatively rotating shaft (200) and the housing (300), and is configured to maintain the fluid pressure in the sealed object area due to the fluid pressure change, and contact the side wall surface (211) on the low-pressure side in the annular groove (210) in a slidable manner. The sealing device (1) includes: a sliding portion (20) that slides relative to the side wall surface (211); an inner peripheral portion (30) that contacts the shaft (200); a sliding portion groove (21) that is formed to extend in the circumferential direction in the sliding portion (20) and is concave in the axial line (x) direction; an introduction groove (22) that is formed to extend from the sliding portion groove (21) to the inner peripheral portion (30) and is concave in the axial line x direction; and an inner peripheral groove (40) that is provided at the joint between the sliding portion (20) and the inner peripheral portion (30) and is concave in the axial line (x) direction.

Description

Technical Field

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

[0002] Conventionally, for example, a sealing device (hereinafter simply referred to as a "sealing device") used as a sealing ring in a rotating shaft of various transmissions such as an automotive automatic transmission (AT: Automatic Transmission) and a continuously variable transmission (CVT: Continuously Variable Transmission) is known. As such a sealing device, it is disclosed that a dynamic pressure generating groove is provided on the sliding portion side that slides relative to the side wall surface, and the dynamic pressure generating groove has a first groove and a second groove. The first groove has a constant radial width and extends in the circumferential direction, and the second groove extends from the circumferential central position in the first groove to the inner peripheral surface and guides the fluid to be sealed into the first groove (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: International Publication No. 2015 / 111707. Summary of the Invention

[0006] However, in the sealing device used in the rotating shaft of various transmissions, in order to address environmental issues, further improvements for reducing the rotational torque are desired.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a sealing device capable of reducing the rotational torque.

[0008] To achieve the above object, the sealing device according to the present invention is an annular sealing device that is installed in an annular groove provided on the outer periphery of a shaft, seals an annular space between the shaft and a housing that rotate relative to each other, is configured to maintain the fluid pressure in the fluid pressure change and seal object area, and is in contact with the side wall surface of the low-pressure side in the annular groove so as to be able to slide relative thereto. The sealing device includes: a sliding portion that slides relative to the side wall surface; an inner peripheral portion that contacts the shaft; a sliding portion groove that is formed to extend in the circumferential direction in the sliding portion and is concave in the axial direction; an introduction groove that is formed to extend from the sliding portion groove to the inner peripheral portion and is concave in the axial direction; and an inner peripheral groove that is provided at a joint portion between the sliding portion and the inner peripheral portion and is concave in the axial direction.

[0009] In the sealing device according to one aspect of the present invention, the inner peripheral groove extends in the circumferential direction at the joint portion and is connected in a ring shape.

[0010] In the sealing device according to one aspect of the present invention, the sliding portion groove is provided in a region that can contact the side wall surface in the radial direction of the sliding portion in the use state.

[0011] In the sealing device according to one aspect of the present invention, the introduction groove is provided at a position in the circumferential end of the sliding portion groove.

[0012] In the sealing device according to one aspect of the present invention, the introduction groove is provided at a position in the circumferential center of the sliding portion groove.

[0013] In the sealing device according to one aspect of the present invention, the radial width of the sliding portion groove is formed to be constant.

[0014] According to the sealing device of the present invention, the rotational torque can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view for showing a schematic structure of the sealing device according to an embodiment of the present invention;

[0016] Figure 2 is viewed from the outer peripheral surface side Figure 1 the sealing device shown;

[0017] Figure 3 is Figure 1 the rear view of the sealing device shown;

[0018] Figure 4 is Figure 3 an enlarged perspective view of the sliding portion of the sealing device shown;

[0019] Figure 5 is Figure 1 a cross-sectional perspective view of the cross-section along the axis in the use state of the sealing device shown;

[0020] Figure 6 is Figure 4 a cross-sectional view of the cross-section A-A of the sliding portion groove of the sealing device shown;

[0021] Figure 7 is Figure 4 a cross-sectional view of the cross-section B-B of the introduction groove of the sealing device shown;

[0022] Figure 8 is Figure 1 a cross-sectional view of the cross-section along the axis in the use state of the sealing device shown;

[0023] Figure 9 is a cross-sectional perspective view of the cross-section along the axis of the sealing device according to the reference example;

[0024] Figure 10 It is an enlarged perspective view showing a modified example of a sliding portion of a sealing device according to an embodiment of the present invention. Detailed Embodiment

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0026] Figure 1 It is a front view for showing a schematic structure of a sealing device 1 according to an embodiment of the present invention. Figure 2 It is a view of the sealing device 1 observed from the outer peripheral surface side. Figure 3 It is a rear view of the sealing device 1. Figure 4 It is an enlarged perspective view of a sliding portion of the sealing device 1. Figure 5 It is a sectional perspective view of a cross section along the axis x in a use state of the sealing device 1.

[0027] Hereinafter, for the sake of convenience of explanation, as Figures 1 to 5 shown, the direction of arrow a in the axis x direction (one side in the axis direction) is set as the high-pressure side, and the direction of arrow b in the axis x direction (the other side in the axis direction) is set as the low-pressure side. In addition, in the direction perpendicular to the axis x (hereinafter, also referred to as "radial direction"), the direction away from the axis x, that is, the direction of arrow c is set as the outer peripheral side, and the direction close to the axis x, that is, the direction of arrow d is set as the inner peripheral side. In the present embodiment, as Figure 1 shown, the direction of observing the sealing device 1 from one side to the other side in the axis x direction is set as the front, and as Figure 3 shown, the direction of observing the sealing device 1 from the other side to one side in the axis x direction is set as the back.

[0028] As Figures 1 to 5 shown, the sealing device 1 according to the present embodiment is, for example, a sealing ring for the purpose of sealing an annular gap between a relatively rotating shaft 200 and a housing 300 (refer to Figure 8 ) in an automotive AT, CVT, etc. transmission in order to maintain a fluid pressure (oil pressure in the present embodiment). In addition, in the following description, the "high-pressure side" refers to the side that becomes high pressure when a differential pressure is generated between both sides of the sealing device 1, and the "low-pressure side" refers to the side that becomes low pressure when a differential pressure is generated between both sides of the sealing device 1. The sealing device 1 is configured such that Figure 5 the fluid pressure in the left region in Figure 5 changes, and the sealing device 1 functions to maintain Figure 5 the fluid pressure in the sealing target region on the left in Figure 5A state in which the fluid pressure on the left side is higher than the fluid pressure on the right side. Hereinafter, Figure 8 The side on the left in this is set as the high-pressure side, and the other side on the right is set as the low-pressure side.

[0029] The sealing device 1 according to an embodiment of the present invention is an annular sealing device that is installed in an annular groove 210 provided on the outer periphery of a shaft 200, seals an annular space S between the relatively rotating shaft 200 and a housing 300, is configured to maintain the fluid pressure in the sealed object area when the fluid pressure changes, and contacts the side wall surface on the low-pressure side among the side wall surfaces 211 and 212 of the annular groove 210 in a slidable manner. The sealing device 1 includes: a sliding portion 20 that slides relative to the side wall surfaces 211 and 212; an inner peripheral portion 30 that contacts the shaft 200; a sliding portion groove 21 that is formed so as to extend in the circumferential direction of the sliding portion 20 and is concave in the axial direction x; an introduction groove 22 that is formed so as to extend from the sliding portion groove 21 to the inner peripheral portion 30 and is concave in the axial direction x; and an inner peripheral groove 40 that is provided at the joint portion between the sliding portion 20 and the inner peripheral portion 30 and is concave in the axial direction x. Hereinafter, the sealing device 1 will be specifically described.

[0030] As Figures 1 to 3 shown, the sealing device 1 is integrally formed in an annular shape. The sealing device 1 includes a disk portion 10, a sliding portion 20, an inner peripheral portion 30, an outer peripheral surface 50, and a joint portion 110. The sealing device 1 is configured such that the circumference of the outer peripheral surface 50 is shorter than the inner circumference of the shaft hole of the housing 300 and is configured not to have an interference amount. Therefore, in a state where no fluid pressure acts, the outer peripheral surface 50 of the sealing device 1 can be in a state of being separated from the inner peripheral surface of the housing 300.

[0031] The disk portion 10 is formed in a disk shape centered on the axial direction x on the Figure 1 front side shown and the Figure 3 back side shown. The disk portion 10 is formed flat or substantially flat in the radial direction and the circumferential direction, which are directions perpendicular to the axial direction x. The disk portion 10 faces the side wall surfaces 211 and 212 (refer to Figure 5 ) of the annular groove 210 formed in the shaft 200 in the axial direction x.

[0032] The sliding portion 20 is formed on the Figure 1 front side shown and the Figure 3The disk portion 10 on the back side shown. The disk portion 10 is formed flat or substantially flat in the radial direction and the circumferential direction, which are directions perpendicular to the x-axis direction, except for the portions where the sliding portion groove 21, the introduction groove 22, and the inner circumferential groove 40 of the sliding portion 20 are provided. The sliding portion 20 faces, in the x-axis direction, the side wall surfaces 211, 212 (see Figure 5 ) of the annular groove 210 formed in the shaft 200, for example. As described above, the sliding portion 20 has a sliding portion groove 21 and an introduction groove 22.

[0033] As Figure 3 shown, a plurality of sliding portion grooves 21 are provided at equal intervals, for example, on the entire circumference of the side surface on the sliding surface side of the sliding portion 20 except near the joint portion 110.

[0034] As Figure 4 shown, the sliding portion groove 21 is provided to generate hydrodynamic pressure when sliding on the side wall surfaces 211, 212 that become the low-pressure side in the usage state of the sealing device 1 with respect to the annular groove 210 provided in the shaft 200. The sliding portion groove 21 is formed in an arc shape or a substantially arc shape such that the radial width is constant and it extends in the circumferential direction R, for example.

[0035] As Figure 5 shown, the sliding portion groove 21 is provided in the following region, which can contact, in the usage state, the side wall surface 211, 212 that becomes the low-pressure side in the usage state of the annular groove 210, for example Figure 5 the side wall surface 211 among them. That is, the sliding portion groove 21 is provided at a position near the inner circumferential portion 30 of the sliding portion 20 so as to be accommodated in the sliding region that slides relative to the side wall surface 211 in the radial direction of the sliding portion 20. The sliding portion groove 21 is formed in a groove shape having a depth from the other side toward one side in the x-axis direction. Regarding the depth of the groove of the sliding portion groove 21, for example, it is configured such that the depth is constant with respect to the radial direction.

[0036] Figure 6 is a cross-sectional view of the cross-section A-A of the sliding portion groove 21 of the sealing device 1. As Figure 6 shown, regarding the depth of the groove of the sliding portion groove 21, with respect to the circumferential direction, for example, the bottom of the sliding portion groove 21 is configured to be shallower at the end portions 201 on both ends than the central portion 202 located at the center in the circumferential direction. Therefore, the angle of the sliding portion groove 21 with respect to the bottom of the sliding portion 20 is formed to have a prescribed angle α from the central portion 202 toward the end portions 201 on both ends.

[0037] Figure 7 is a cross-sectional view of the cross-section B-B of the introduction groove 22 of the sealing device 1. As Figure 4 、 Figure 5 and Figure 7As shown, the introduction groove 22 is provided, for example, at a position in the circumferential center of the sliding part groove 21. The introduction groove 22 is formed to extend from the sliding part groove 21 toward the inner circumferential side to the inner circumferential part 30, that is, to penetrate the sliding part groove 21 and the inner circumferential part 30. The introduction groove 22 guides the fluid to be sealed from the annular groove 210 of the shaft 200 into the sliding part groove 21. The introduction groove 22 is formed as a groove having a depth from the other side toward one side in the axial direction x. The depth of the bottom of the introduction groove 22 is formed, for example, deeper than the depth of the inner circumferential groove 40 and the bottom of the sliding part groove 21. The introduction groove 22 is configured such that the bottom of the groove becomes shallower, for example, from the inner circumferential bottom 221 facing the inner circumferential part 30 to the outer circumferential bottom 222 on the outer circumferential side via a stepped portion 223. In addition, the depth of the bottom of the introduction groove 22 is not limited to the above example.

[0038] The inner circumferential part 30 is formed in a cylindrical shape and faces the circumferential wall surface 213 of the annular groove 210 in the inner circumferential direction. The inner circumferential part 30 is provided with an inner circumferential groove 40 that is concave in the axial direction x at the joint between the sliding part 20 and the inner circumferential part 30, that is, at the ends on one side (arrow a direction) and the other side (arrow b direction) in the axial direction x of the inner circumferential part 30.

[0039] The inner circumferential groove 40 is a groove that is connected in a ring shape so as to extend in the circumferential direction at the joint. The inner circumferential side surface of the inner circumferential groove 40 faces the circumferential wall surface 213 of the annular groove 210 of the shaft 200 in the use state, and the sliding part 20 side surface of the inner circumferential groove 40 faces the side wall surfaces 211 and 212 of the annular groove 210 in the use state. The inner circumferential groove 40 is connected to the introduction groove 22 on the radially outer circumferential side. That is, the inner circumferential groove 40 communicates with the sliding part groove 21 via the introduction groove 22. The radially outer circumferential end of the inner circumferential groove 40 extends to the inner circumferential side end of the sliding part groove 21 or its vicinity.

[0040] The outer circumferential surface 50 is formed in a cylindrical shape and faces the housing 300 in the outer circumferential direction.

[0041] The joint part 110 is provided at one part in the circumferential direction of the sealing device 1. The joint part 110 is cut into a stepped shape when observed from any of the outer circumferential surface 50 side, the disk part 10 side, and the sliding part 20. By being formed in a stepped shape as described above, the joint part 110 has the characteristic of maintaining stable sealing performance even when the circumference of the sealing device 1 changes due to thermal expansion and contraction.

[0042] The sealing device 1 is made of a resin material such as polyetheretherketone (PEEK), polyphenylene sulfide (PPS), or polytetrafluoroethylene (PTFE).

[0043] Next, the use state of the above sealing device 1 will be described.

[0044] Figure 8This is a cross-sectional view of the sealing device 1 along the axis x in the operating state.

[0045] As Figure 8 shown, the sealing device 1 is installed in the annular groove 210 provided on the outer periphery of the shaft 200, and seals the annular space S between the relatively rotating shaft 200 and the housing 300 (the inner peripheral surface of the shaft hole in the housing 300 through which the shaft 200 is inserted). Thus, the sealing device 1 maintains the fluid pressure (oil pressure P) of the sealed object area formed in a manner of oil pressure change. Here, the sealing device 1 is Figure 8 shown in Figure 5 in the same way as Figure 8 a state where the fluid pressure on the left side is higher than the fluid pressure on the right side. Specifically, in Figure 8 it shows a state where a differential pressure is generated via the sealing device 1 by starting an engine (not shown) equipped with the sealing device 1. In the state where a differential pressure is generated by starting the engine, the sealing device 1 becomes in close contact with the side wall surface corresponding to the low-pressure side of the annular groove 210, for example, the side wall surface 211 in Figure 8 and the inner peripheral surface of the shaft hole of the housing 300. In addition, in this state, the inner peripheral portion 30 of the sealing device 1 floats from the peripheral wall surface 213 of the annular groove 210. In addition, in this state, a protruding gap D2 is generated between the inner peripheral surface of the housing 300 and the outer peripheral surface of the shaft 200.

[0046] As Figure 8 shown, the sealing device 1 seals the annular space S between the relatively rotating shaft 200 and the housing 300 in the operating state. Thus, the sealing device 1 can maintain the oil pressure P of the sealed object area (the high-pressure side area) formed in a manner of oil pressure P change. Here, when the shaft 200 and the housing 300 rotate relatively, the sliding portion 20 of the sealing device 1 slides between the side wall surface 211 on the low-pressure side of the annular groove 210. At this time, in the sealing device 1, hydrodynamic pressure is generated when the sealed object fluid flows out from the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 provided in the sliding portion 20 to the sliding portion 20. When the sealing device 1 rotates in the clockwise direction in Figure 3 with respect to the annular groove 210, the sealed object fluid flows out from the end portion 201 on the counterclockwise side of the sliding portion groove 21 to the sliding portion 20. In addition, when the sealing device 1 rotates in the counterclockwise direction in Figure 3 with respect to the annular groove 210, the sealed object fluid flows out from the end portion 201 on the clockwise side of the sliding portion groove 21 to the sliding portion.

[0047] According to the sealing device 1 described above, as described above, the sealed object fluid is introduced into the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40. Therefore, in the sliding portion 20, within the range where the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 are provided, for example,Figure 8 Within the range of the height H2 from the inner peripheral portion 30 as shown, the fluid pressure acting on the sealing device 1 from the high-pressure side and the fluid pressure acting on the sealing device 1 from the low-pressure side are canceled out. Thus, the sealing device 1 can reduce the pressure-receiving area of the fluid pressure (the fluid pressure from the high-pressure side to the low-pressure side) by an amount corresponding to the area of the sliding portion 20 where the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 are provided (the area closer to the inner peripheral side than the height H2 from the inner peripheral portion 30).

[0048] In addition, according to the sealing device 1, when the sliding portion 20 slides relative to the side wall surfaces 211, 212 on the low-pressure side in the annular groove 210, hydrodynamic pressure is generated when the fluid to be sealed flows out from the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 into the sliding portion. Thus, a force in a direction away from the side wall surfaces 211, 212 is generated on the sealing device 1.

[0049] As described above, according to the sealing device 1, by providing the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 in the sliding portion 20, the pressure-receiving area is reduced, and thus the rotational torque can be effectively reduced. In this way, according to the sealing device 1, a reduction in rotational torque (sliding torque) can be achieved, thereby suppressing heat generation due to sliding, and the sealing device 1 can be properly used even under high-speed and high-pressure environmental conditions. In addition, according to the sealing device 1, along with this, a soft material such as aluminum can also be used as the material of the shaft 200.

[0050] In addition, according to the sealing device 1, since the fluid to be sealed can be introduced into the sliding portion 20 through the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40, a fluid film (oil film) can be formed more efficiently on the side wall surfaces 211, 212. That is, according to the sealing device 1, the rotational torque can be effectively reduced.

[0051] In addition, according to the sealing device 1, the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 are provided in the sliding region that slides relative to the side wall surfaces 211, 212 of the annular groove 210 with respect to the shaft 200 in the use state. That is, since the sliding portion groove 21, the introduction groove 22, and the inner peripheral groove 40 are provided at a position lower than the height H2 in a region that does not belong to the protruding gap D2 with respect to the height H1 of the sliding portion 20, leakage of the fluid to be sealed can be suppressed.

[0052] In addition, according to the sealing device 1, as Figure 6As shown, if the bottom of the sliding portion groove 21 is configured to be shallower at the end portions 201 on both ends than the central portion 202 at the circumferential center, the above-described dynamic pressure can be effectively generated by the wedge effect. In particular, in the case of adopting a structure in which the bottom of the sliding portion groove 21 gradually becomes shallower from the central portion 202 toward the end portions 201 on both sides, even if the sliding portion 20 in the sealing device 1 wears over time, the wedge effect can be stably exhibited.

[0053] Figure 9 FIG. 4 is a cross-sectional perspective view of the sealing device 1A according to the reference example along the axis x. The sealing device 1A according to the reference example is different from the sealing device 1 described above in that no inner circumferential groove 40 is provided at the joint portion between the inner circumferential side end portion of the sliding portion 20A and the inner circumferential portion 30.

[0054] As Figure 9 shown, the sealing device 1A according to the reference example does not have an inner circumferential groove 40 at the joint portion between the inner circumferential side end portion of the sliding portion 20A and the inner circumferential portion 30. Therefore, when the sealing device 1A is formed such that the side wall surface 211 of the annular groove 210 of the shaft 200, for example Figure 9 the side wall surface 211 in FIG. 11 opens toward the outer circumferential side from the circumferential wall surface 213, the inner circumferential side end portion of the sliding portion 20A contacts the side wall surface 211. In addition, even when the shaft 200 is inclined for some reason, the inner circumferential side end portion of the sliding portion 20A contacts the side wall surface 211. In such a case, the gap D3 generated between the sliding portion 20A and the side wall surface 211 of the sealing device 1A becomes large, and improvement in sealing performance is desired.

[0055] On the other hand, the sealing device 1 is provided with an inner circumferential groove 40 at the inner circumferential side end portion of the sliding portion 20. Thus, as Figure 5 shown, when the sealing device 1 is formed such that the side wall surface 211 of the annular groove 210 of the shaft 200 opens toward the outer circumferential side from the circumferential wall surface 213, it is possible to contact the side wall surface 211 near the inner circumferential groove 40. Therefore, according to the sealing device 1, the gap D1 generated between the sliding portion 20 and the side wall surface 211 can be reduced, and thus improvement in sealing performance can be achieved.

[0056] As described above, according to the sealing device 1 according to the first embodiment of the present invention, reduction in rotational torque can be achieved.

[0057] As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above-described embodiments of the present invention, and includes all modes included in the concept of the present invention and the claims. In addition, in order to satisfy at least a part of the above-described problems and effects, the respective structures may be appropriately and selectively combined. For example, the shape, material, arrangement, dimensions, etc. of each constituent element in the above-described embodiments may be appropriately changed according to the specific usage mode of the present invention.

[0058] Figure 10 is an enlarged perspective view showing a modified example of the sliding portion 20B of the sealing device 1B according to an embodiment of the present invention. As Figure 10 shown, in the present invention, the introduction groove 22B of the sliding portion groove provided in the sliding portion 20B of the sealing device 1B is not limited to being provided at the circumferential center portion of the sliding portion groove 21B as described above. For example, it may be provided at the circumferential end portion 202B of the sliding portion groove 21B. In this case, the bottom of the sliding portion groove 21B may also be formed to gradually become shallower from the end portion 202B toward the end portion 201B.

[0059] In addition, in the sealing device 1, the shape of the sliding portion groove 21 is not limited to the above-described shape, and various structures can be adopted. For example, in the sealing device 1, the bottom of the sliding portion groove 21 provided in the sliding portion 20 may also be configured to gradually become shallower from the circumferential center toward both sides in a planar shape. In addition, in the sealing device 1, the bottom of the sliding portion groove 21 may also be configured to gradually become shallower from the circumferential center toward both sides in a curved surface shape. In addition, in the sealing device 1, the bottom of the sliding portion groove 21 may also be configured to become shallower from the circumferential center toward both sides in a stepped shape. In addition, in the sealing device 1, the bottom of the sliding portion groove 21 may also be configured to become shallower from the circumferential center toward both sides in a stepped shape, and the stepped portion is an inclined surface. In this way, since the bottom of the sliding portion groove 21 of the sealing device 1 is configured to be shallower at both ends than at the circumferential center, dynamic pressure can be more effectively generated by the wedge effect.

[0060] In addition, the sealing devices 1 and 1B are provided with sliding portion grooves 21, introduction grooves 22 and 22B, and inner circumferential grooves 40 on both sides of the disk portion 10. In this way, by providing the sliding portions 20 on both sides of the disk portion 10, the sealing devices 1 and 1B can also function as described above to reduce the pressure receiving area of the fluid pressure, etc., even when they are in a state of being in close contact with the side wall surface 212 of the disk portion 10 facing one side and the inner circumferential surface of the shaft hole of the housing 300 in addition to the side wall surface 211 of the annular groove 210 of the disk portion 10 facing the other side, that is, when the low pressure side and the high pressure side can change between one side and the other side depending on the situation.

[0061] In addition, the sealing device 1 is not limited to a structure in which the above-mentioned joint portion 110 and a plurality of sliding portion grooves 21 are formed in an annular member having a rectangular cross-section, which means that it is not necessarily formed by processing an annular member having a rectangular cross-section as the raw material to form the joint portion 110 and a plurality of sliding portion grooves 21. Of course, these components can also be obtained by machining after forming an annular member with a rectangular cross-section. However, for example, after pre-forming a member having a joint portion 110, a plurality of sliding portion grooves 21 can be obtained by machining, and the manufacturing method is not particularly limited.

[0062] In addition, the shape of the joint portion 110 is not limited to the above-mentioned shape. For example, linear cutting, bevel cutting, stepped cutting, etc. can also be used. In addition, as the material of the sealing device 1, in the case of using a material with low elasticity (such as PTFE), the joint portion 110 may not be provided and it may be formed into an annular shape.

[0063] In addition, the directions in the sealing devices 1 and 1B described above are only for the convenience of explanation. Therefore, for example, in the sealing devices 1 and 1B, the arrow a direction (one side in the axial direction) in the x-axis direction of the axis can be set as the low-pressure side, and the arrow b direction (the other side in the axial direction) in the x-axis direction of the axis can be set as the high-pressure side.

[0064] Moreover, in the sealing devices 1 and 1B described above, the sliding portions 20 and 20B are provided on the disk portion 10 facing both the one side and the other side, and the sliding portion grooves 21, the introduction grooves 22 and 22B, and the inner peripheral groove 40 are provided in the sliding portions 20 and 20B. However, in the present invention, the sliding portion 20 can also be provided on any one of the disk portions 10 on the one side or the other side.

[0065] Symbol Explanation

[0066] 1, 1A, 1B... Sealing device, 10... Disk portion, 20, 20A, 20B... Sliding portion, 21... Sliding portion groove, 22, 22B... Introduction groove, 30... Inner peripheral portion, 40... Inner peripheral groove, 50... Outer peripheral surface, 110... Joint portion, 200... Axis, 201, 201B... End portion, 202, 202B... End portion, 210... Annular groove, 211, 212... Side wall surface, 213... Peripheral wall surface, 221... Inner peripheral bottom, 222... Outer peripheral bottom, 223... Step portion, 300... Housing, D1, D3... Gap, D2... Protrusion gap, H1, H2... Height.

Claims

1. A sealing device, which is an annular sealing device installed in an annular groove provided on the outer periphery of a shaft, seals an annular space between the relatively rotating shaft and a housing, is configured to maintain the fluid pressure in the sealed object area due to a fluid pressure change, and contacts the side wall surface of the low-pressure side in the annular groove in a manner that can slide relative to it. The sealing device includes: A sliding part that slides relative to the side wall surface; An inner peripheral part that contacts the shaft; A sliding part groove formed to extend in the circumferential direction in the sliding part and be concave in the axial direction; An introduction groove formed to extend from the sliding part groove to the inner peripheral part and be concave in the axial direction; And An inner peripheral groove provided at the joint between the sliding part and the inner peripheral part and concave in the axial direction, The inner peripheral groove is provided to connect adjacent introduction grooves in the circumferential direction, and the bottom depth of the introduction groove is formed deeper than the bottom depth of the inner peripheral groove.

2. The sealing device according to claim 1, wherein The sliding part groove is provided in a region that can contact the side wall surface in the radial direction of the sliding part in the use state.

3. The sealing device according to claim 1 or 2, wherein The introduction groove is provided at the circumferential end position of the sliding part groove.

4. The sealing device according to claim 1 or 2, wherein The introduction groove is provided at the circumferential center position of the sliding part groove.

5. The sealing device according to any one of claims 1 to 4, wherein The radial width of the sliding part groove is formed to be constant.

6. The sealing device according to any one of claims 1 to 5, wherein The inner peripheral side surface of the inner peripheral groove faces the circumferential wall surface of the annular groove in the use state, and the sliding part side surface of the inner peripheral groove faces the side wall surface of the annular groove in the use state.

Images