Seal and seal structure

Abstract

The invention provides a sealing member and a sealing structure. The sealing member and the sealing structure are configured in a manner of maintaining air tightness and reducing reaction force during installation. Specifically, the seal has: a first curved surface positioned on a first side in a first direction and recessed toward a second side opposite the first side; and a second curved surface located on the second side in the first direction and bulging toward the second side. The second curved surface completely overlaps the first curved surface when viewed in the first direction. The sealing structure includes the sealing material and an object to be sealed that sandwiches the sealing material from both sides in a second direction orthogonal to the first direction.

Description

Technical Field

[0001] The present invention relates to a sealing member and a sealing structure. Background Art

[0002] Sealing members are widely used for the purpose of imparting airtightness to a sealed object. An example of a conventional sealing member is disclosed in Patent Document 1. The sealing member disclosed in the document has a cross-sectional shape having a bottom, a first side wall portion, a second side wall portion, and a recessed portion. The sealing member is intended to be installed in such a manner that the bottom, the first side wall portion, and the second side wall portion are in contact with the recessed portion provided in the sealed object.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-40472 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] The sealing objects to which the seal is installed are various, and each requires various characteristics. The more the seal is deformed to improve airtightness, the greater the reaction force acting from the seal on the sealing object. For example, in the case where the sealing object is made of brittle materials such as quartz, if the reaction force is too large, the sealing object may be damaged. Alternatively, in the case where the sealing object is composed of parts that slide against each other, due to the high reaction force of the seal, part of the seal is easily worn. The wear powder of the seal may become impurities in the sealing object.

[0008] The present invention has been made based on the above circumstances, and an object of the present invention is to provide a seal and a seal structure that can maintain airtightness and reduce the reaction force during mounting.

[0009] Technical solutions to solve problems

[0010] The seal provided by the first aspect of the present invention includes: a first curved surface located on the first side of the first direction and recessed toward the second side opposite to the first side; and a second curved surface located on the second side of the first direction and bulging toward the second side, and when observed in the first direction, the second curved surface completely overlaps with the first curved surface.

[0011] In a preferred embodiment of the present invention, the above-mentioned first curved surface has: a first endpoint, which is an endpoint of a first side of a second direction orthogonal to the above-mentioned first direction; and a second endpoint, which is an endpoint of a second side of the second direction on the side opposite to the above-mentioned first side, and a first straight line obtained by extending the normal of the above-mentioned first curved surface at the above-mentioned first endpoint and a second straight line obtained by extending the normal of the above-mentioned first curved surface at the above-mentioned second endpoint both intersect the above-mentioned second curved surface.

[0012] In a preferred embodiment of the present invention, the first curved surface and the second curved surface are respectively line symmetric about the same symmetry axis extending in the first direction.

[0013] In a preferred embodiment of the present invention, the thickness of the portion intersecting the axis of symmetry is 0.5 times or more and 3.0 times or less of the thickness of the portion intersecting the first straight line or the second straight line.

[0014] In a preferred embodiment of the present invention, an angle formed by the first straight line and the second straight line is greater than or equal to 60° and less than or equal to 210°.

[0015] In a preferred embodiment of the present invention, it also includes: a third curved surface, which is between the first curved surface and the second curved surface on the first side of the second direction orthogonal to the first direction; and a fourth curved surface, which is between the first curved surface and the second curved surface on the second side of the second direction.

[0016] In a preferred embodiment of the present invention, the sealing member is in the shape of a closed ring.

[0017] In a preferred embodiment of the present invention, the first side in the first direction is an outer side of the ring shape, and the second side in the first direction is an inner side of the ring shape.

[0018] A sealing structure provided by a second aspect of the present invention includes: the sealing member provided by the first aspect of the present invention; and a sealed object sandwiching the sealing member from both sides in a second direction orthogonal to the first direction.

[0019] Effects of the Invention

[0020] According to the present invention, it is possible to reduce the reaction force during mounting while maintaining airtightness.

[0021] Other features and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A sealing member according to a first embodiment of the present invention is shown, wherein (a) is a plan view, (b) is a front view, and (c) is a cross-sectional view taken along line cc of (a).

[0023] Figure 2 It is a partially enlarged cross-sectional view showing a seal member according to a first embodiment of the present invention.

[0024] Figure 3 The sealing structure of the first embodiment of the present invention is shown in FIG. 1 , wherein (a) is a partial enlarged cross-sectional view before an airtight state is achieved, and (b) is a partial enlarged cross-sectional view after an airtight state is achieved.

[0025] Figure 4 (a) and (b) are partially enlarged cross-sectional views showing a first modification and a second modification of the seal according to the first embodiment of the present invention.

[0026] Figure 5 (a) is a plan view showing a sealing member according to a second embodiment of the present invention, and (b) is a partial plan view showing a sealing member according to a third embodiment of the present invention.

[0027] Figure 6 (a) and (b) are partially enlarged cross-sectional views showing a seal according to a fourth embodiment of the present invention and a first modification thereof.

[0028] Figure 7 (a) and (b) are partially enlarged cross-sectional views showing a second modification and a third modification of the seal according to the fourth embodiment of the present invention.

[0029] Figure 8 It is a partially enlarged view showing a seal member according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] The terms “first”, “second”, and “third” in the present invention are used only for identification and are not intended to give an order to these objects.

[0032] <First Embodiment>

[0033] Figure 1 to Figure 3 The seal and sealing structure of the first embodiment of the present invention are shown. The overall shape of the seal of the present invention is not limited in any way, and can be set to a closed loop shape without ends such as a circular ring, an elliptical ring, a rectangular ring, or various shapes with ends such as a straight line, a curve, or a bend. The seal A10 of this embodiment is a closed loop, and is a circular ring with a central axis CS. In the seal A10, the radial direction (radial direction) r is the first direction of the present invention, and the axial direction (axial direction) z is the second direction of the present invention. The cross-sectional shape of the seal A10 that is orthogonal to the circumferential direction (circumferential direction) θ is Figure 1(c) The cross-sectional shape shown.

[0034] In addition, Figure 2 In the embodiment, the outer side of the radial direction r (first direction), that is, the outer side of the ring, is set as the r1 side (the first side of the first direction of the present invention), and the inner side of the radial direction r (first direction), that is, the inner side of the ring, is set as the r2 side (the second side of the first direction of the present invention). In addition, one side (upper side) of the axial direction z (second direction) is set as the z1 side (the first side of the second direction of the present invention), and the other side (lower side) of the axial direction z (second direction) is set as the z2 side (the second side of the second direction of the present invention). The seal of the present invention is formed by clamping the sealed object from both sides of the second direction to form a sealing structure, and is intended to maintain airtightness.

[0035] When used in the sealing structure B10, the seal A10 is preferably made of a material that can appropriately maintain airtightness. As the material of the seal A10, a material that is flexible and easily elastically deformable is selected, such as rubber materials represented by fluororubber and silicone rubber.

[0036] The seal A10 has a first curved surface 1, a second curved surface 2, a third curved surface 3, a fourth curved surface 4, a fifth surface 5, and a sixth surface 6. The first curved surface 1 is located on the r1 side of the radial direction r, and is a concave curved surface that is recessed toward the r2 side of the radial direction r. The second curved surface 2 is located on the r2 side of the radial direction r, and is a convex curved surface that bulges toward the r2 side of the radial direction r.

[0037] When viewed in the radial direction r, the second curved surface 2 completely overlaps the first curved surface 1. Figure 2 In the cross-sectional shape shown, when the end point on the z1 side of the axial direction z of the first curved surface 1 is set as the first end point P1, a straight line L11 passing through the first end point P1 and parallel to the radial direction r intersects the second curved surface 2. In addition, when the end point on the z2 side of the axial direction z of the first curved surface 1 is set as the second end point P2, a straight line L21 passing through the second end point P2 and parallel to the radial direction r intersects the second curved surface 2.

[0038] In addition, Figure 2 In the cross-sectional shape shown, a first straight line L12 obtained by extending the normal line at the first end point P1 of the first curved surface 1 intersects the second curved surface 2. A second straight line L22 obtained by extending the normal line at the second end point P2 of the first curved surface 1 intersects the second curved surface 2.

[0039] Furthermore, in this embodiment, Figure 2 In the cross-sectional shape shown, the first curved surface 1 and the second curved surface 2 are respectively line symmetric with respect to a symmetry axis AS extending in the radial direction r.

[0040] In addition, the thickness t0 of the portion of the seal A10 intersecting the axis of symmetry AS is greater than 0.5 times and less than 3.0 times the thickness t1 of the portion of the seal A10 intersecting the first straight line L12 or the thickness t2 of the portion of the first curved surface 1 intersecting the second straight line L22, preferably greater than 0.5 times and less than 2.0 times, and more preferably greater than 1.0 times and less than 1.5 times.

[0041] In addition, the angle α formed by the first straight line L12 and the second straight line L22 is greater than 60° and less than 210°, preferably greater than 90° and less than 180°. In the example shown in the figure, the angle α is set to about 120°. In the example shown in the figure, even if the angle α is 180°, the second curved surface 2 is set within the range of intersection with the first straight line L12 and the second straight line L22.

[0042] The third curved surface 3 is located between the first curved surface 1 and the second curved surface 2 on the z1 side of the axial direction z, and is a convex curved surface that bulges toward the z1 side of the axial direction z and the r1 side of the radial direction r. The third curved surface 3 can be directly connected to the first curved surface 1 and the second curved surface 2, or other parts can be further inserted between them. In the example shown in the figure, the second curved surface 2 is directly connected to the third curved surface 3, and the first curved surface 1 is not directly connected to the third curved surface 3. Different from the example shown in the figure, the first curved surface 1 and the third curved surface 3 can also be directly connected.

[0043] The fourth curved surface 4 is located between the first curved surface 1 and the second curved surface 2 on the z2 side of the axial direction z, and is a convex curved surface that bulges toward the z2 side of the axial direction z and the r1 side of the radial direction r. The fourth curved surface 4 can be directly connected to the first curved surface 1 and the second curved surface 2, or other parts can be further inserted between them. In the example shown in the figure, the second curved surface 2 is directly connected to the fourth curved surface 4, and the first curved surface 1 is not directly connected to the fourth curved surface 4. Unlike the example shown in the figure, the first curved surface 1 and the fourth curved surface 4 can also be directly connected. In addition, in Figure 2 In the cross-sectional shape shown, the third curved surface 3 and the fourth curved surface 4 are line symmetric with respect to the symmetry axis AS.

[0044] The fifth surface 5 is between the first curved surface 1 and the third curved surface 3. The specific shape of the fifth surface 5 is not limited in any way, and in the example shown in the figure, it is a flat surface inclined relative to the radial direction r. The sixth surface 6 is between the first curved surface 1 and the fourth curved surface 4. The specific shape of the sixth surface 6 is not limited in any way, and in the example shown in the figure, it is a flat surface inclined relative to the radial direction r to the side opposite to the fifth surface 5. Figure 2 In the cross-sectional shape shown, the fifth surface 5 and the sixth surface 6 are line-symmetrical about the symmetry axis AS. That is, in the example shown in the figure, the entire seal A10 is line-symmetrical about the symmetry axis AS.

[0045] Figure 3The sealing structure B10 using the sealing member A10 is Figure 2 The same partial cross-sectional view omits the center axis CS and the axis of symmetry AS. The sealing structure B10 includes a seal A10 and sealing objects 91 and 92. The sealing objects 91 and 92 are objects that are given airtightness by the seal A10. There is no limitation on the shape, size, material, etc. of the sealing objects 91 and 92. In the example shown in the figure, the sealing object 91 has a groove 911. The groove 911 is a groove that is recessed toward the z2 side of the axial direction z and is annular when viewed in the axial direction z. The sealing object 92 is a plate-like component that is arranged on the z1 side of the axial direction z relative to the sealing object 91.

[0046] exist Figure 3 In (a), the seal A10 is placed in the groove 911 of the sealed object 91. At this time, the seal A10 is still in a non-compressed state, and a part of it protrudes from the groove 911 to the z1 side in the axial direction z.

[0047] exist Figure 3 In (b), the sealing object 92 is pressed toward the z2 side in the axial direction z, and the seal A10 is clamped by the sealing object 91 and the sealing object 92 from both sides in the axial direction z. As a result, the seal A10 shrinks in the axial direction z and elastically deforms in an overall bending manner. More specifically, the curvature radius of the first curved surface 1 and the second curved surface 2 is smaller in the figure (b) than in the figure (a). In the sealing structure B10 in the figure (b), a reaction force in the axial direction z is applied from the seal A10 to the sealing object 91 and the sealing object 92, respectively.

[0048] In the sealing structure B10, the first area s1 on the r1 side of the radial direction r and the second area s2 on the r2 side of the radial direction r are divided into a mutually airtight state by the seal A10. In one embodiment of the sealing structure B10, the first area s1 is set as the high-pressure side and the second area s2 is set as the low-pressure side. In another embodiment of the sealing structure B10, the first area s1 is set as the low-pressure side and the second area s2 is set as the high-pressure side. Figure 3 In the structure shown in (b), when the first area s1 is the high-pressure side and the second area s2 is the low-pressure side, it is preferred to prevent the end of the seal A10 from being accidentally deformed locally due to the pressure difference and the airtightness of the sealing structure B10 from being weakened. In addition, the first area s1 and the second area s2 can also be set to the same pressure. Even if the first area s1 and the second area s2 are at the same pressure, for example, when different types of fluids exist in the first area s1 and the second area s2, their mixing can be suppressed.

[0049] Next, the functions of the seal A10 and the seal structure B10 will be described.

[0050] According to the present embodiment, the seal A10 has a first curved surface 1 and a second curved surface 2. When viewed in the radial direction r (first direction), the second curved surface 2 overlaps the entire first curved surface 1. According to such a structure, for example, compared with a general seal having a circular cross-sectional shape or a seal having a shape such as a flat surface, a curved portion, a stepped portion, etc. at a portion where the first curved surface 1 and the second curved surface 2 of the seal A10 are provided, the reaction force generated when clamped from both sides in the axial direction z (second direction) can be reduced.

[0051] By being able to reduce the reaction force of the seal A10, e.g. Figure 3 In the sealing structure B10, even when the sealing object 92 is made of a brittle material such as quartz, the reaction force of the seal A10 can be suppressed from causing damage to the sealing object 92. In addition, even when the sealing object 91 and the sealing object 92 slide against each other, since the reaction force of the seal A10 is small, the seal A10 can be suppressed from being worn due to friction with the sealing object 91 and the sealing object 92. As a result, the worn powder of the seal A10 can be prevented from becoming impurities.

[0052] In addition, the second curved surface 2 of the present embodiment is arranged in the range intersecting the first straight line L12 and the second straight line L22. Thus, when sandwiched from both sides in the axial direction z, a wider range of the seal A10 can be bent and deformed uniformly (without bias). This is conducive to reducing the reaction force.

[0053] The first curved surface 1 and the second curved surface 2 are respectively symmetrical about the symmetry axis AS. Therefore, when the seal A10 is clamped from both sides of the axial direction z, the seal A10 can be elastically deformed in a more balanced manner, which is conducive to reducing the reaction force. In addition, the entire seal A10 is symmetrical about the symmetry axis AS. Therefore, in Figure 3 In the sealing structure B10 shown, when the seal A10 is placed in the groove 911 of the sealed object 91, it can be placed in any direction in the axial direction z, and the sealing structure B10 can be configured to avoid incorrect mounting direction.

[0054] Unlike the present embodiment, for example, in the case of using a mold to form a seal in which the first curved surface 1 is located on the r2 side of the radial direction r and the second curved surface 2 is located on the r1 side of the radial direction r, it is not easy to disengage the mold located on the r2 side (inner side) of the radial direction r than the first curved surface 1 which is a concave curved surface after the formation. For example, the mold divided into multiple parts is forcibly disengaged through complex actions, or the formed seal is stretched in the radial direction r and the circumferential direction θ. In this case, there is a concern about a decrease in the forming efficiency, unintentional deformation of the seal, etc. In the present embodiment, the first curved surface 1 is located on the r1 side of the radial direction r, and the second curved surface 2 is located on the r2 side of the radial direction r. In the case of using a mold to form the seal A10, for example, if two molds that can approach and move away from the z1 side and the z2 side of the axial direction z, and a mold that can approach and move away from the r1 side and the r2 side of the radial direction r are used, the seal A10 can be efficiently formed without stretching the seal A10, etc.

[0055] In the seal A10, the thickness t0 is 0.5 times or more and 3.0 times or less of the thickness t1 or t2. For example, if the thickness t0 is too thick relative to the thickness t1 or t2, or the thickness t1 or t2 is too thin relative to the thickness t0, only the two sides of the seal A10 in the axial direction z are selectively deformed, and the central part of the seal A10 in the axial direction z may not deform to the desired extent. As a result, the reaction force cannot be sufficiently reduced, or the seal A10 may be deformed to a certain extent. Figure 3 When the pressure difference between the first area s1 and the second area s2 shown is large, the airtight state may not be maintained. According to this embodiment, a larger portion of the seal A10 can be deformed as a whole. Thus, for example, even when the pressure difference between the first area s1 and the second area s2 is large, the airtight state can be maintained more reliably. In addition, whether the first area s1 is the high pressure side or the second area s2 is the high pressure side, the seal A10 can properly maintain the airtight state in both shells.

[0056] Furthermore, when the angle α is 60° or more and 210° or less, the proportion of the first curved surface 1 and the second curved surface 2 to the entire seal A10 can be set sufficiently large. Such a structure is preferable for reducing the reaction force.

[0057] In the seal A10, a third curved surface 3 and a fourth curved surface 4 are provided. In addition, the first curved surface 1, the second curved surface 2, the third curved surface 3, the fourth curved surface 4, the fifth surface 5 and the sixth surface 6 are smoothly connected to each other without passing through a protruding portion, a partially recessed portion or a stepped portion. As a result, the seal A10 as a whole becomes a shape having a smooth surface, and when it is clamped from both sides of the axial direction z, it is possible to avoid unintentional generation of local stress at any position. This is effective in reducing the reaction force. In addition, by suppressing the local stress, it is possible to expect the effect of preventing a part of the seal A10 from being selectively damaged.

[0058] Figures 4 to 8 The modified examples and other embodiments of the present invention are shown. In addition, in these figures, the same or similar elements as those in the above-mentioned embodiments are marked with the same reference numerals as those in the above-mentioned embodiments. In addition, the structures of each part in each modified example and each embodiment can be appropriately combined with each other within the range that does not cause technical contradictions.

[0059] <First Embodiment First Modification>

[0060] Figure 4 (a) represents a first modification of the seal A10. The seal A11 of this modification uses the inner side of the radial direction r (first direction) as the first side of the first direction of the present invention, and uses the outer side of the radial direction r (first direction) as the second side of the first direction of the present invention. That is, the first curved surface 1 is arranged on the inner side of the radial direction r, and the second curved surface 2 is arranged on the outer side of the radial direction r. In the seal A11, it is also intended to form a sealing structure by being sandwiched by the sealed object from both sides of the axial direction z to maintain airtightness.

[0061] According to this modification, the reaction force during installation can be reduced while maintaining airtightness. In the case of a closed ring shape as a whole, the first curved surface 1 and the second curved surface 2 may be arranged on either the inner side or the outer side in the radial direction r.

[0062] <Second Modification of First Embodiment>

[0063] Figure 4 (b) shows a second modified example of the seal A10. The seal A12 of this modified example is set in such a way that the axial direction z becomes the first direction of the present invention. The first curved surface 1 is located on one side of the axial direction z ( Figure 2 The second curved surface 2 is located on the other side of the axis direction z ( Figure 2 The seal member A12 is intended to be sandwiched by the sealed object from both sides in the radial direction r to form a sealed structure and maintain airtightness.

[0064] According to this modification, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, it can be understood from this modification that when the entire sealing component is a closed ring, it is not limited to the structure in which the first direction is the radial direction r, and the first direction can also be, for example, the axial direction z. In such a structure, when the seal A12 is clamped from both sides (inside and outside) of the radial direction r, the reaction force acting on the radial direction r can also be reduced.

[0065] <Second Embodiment>

[0066] Figure 5 (a) is a plan view of a seal according to a second embodiment of the present invention. The seal A20 of this embodiment is a rectangular ring when viewed in the axial direction z. According to this embodiment, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, it can be understood from this embodiment that when the sealing component is a closed ring as a whole, there is no limitation on the specific shape. In addition to a circular ring and a rectangular ring, various seals can be set corresponding to the shape of a sealed object such as a polygonal ring, a ring including multiple curved portions (protruding outward or inward when viewed in the axial direction z), etc.

[0067] <Third Embodiment>

[0068] Figure 5 (b) is a partial plan view of a seal according to a third embodiment of the present invention. The seal A30 of this embodiment is linear as a whole, and is a shape having an end, unlike a closed loop. As a shape having an end, in addition to a linear shape, a curved shape, a zigzag shape, etc. can also be cited.

[0069] According to this embodiment, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, as can be understood from this embodiment, the seal of the present invention is not limited to a closed loop shape without ends, and can also be a shape with ends. Even if the seal A30 is a linear seal, the areas on both sides can be divided in a mutually airtight state by sandwiching the seal A30.

[0070] <Fourth Embodiment>

[0071] Figure 6 (a) is an enlarged cross-sectional view showing a seal member according to a fourth embodiment of the present invention. Figure 2 The seal A40 of the present embodiment does not have the third curved surface 3 and the fourth curved surface 4 in the above-mentioned embodiment, but has a flat surface 71 and a flat surface 81 .

[0072] The plane 71 is located between the second curved surface 2 and the first curved surface 1 on the z1 side of the axial direction z, and is connected to the second curved surface 2 and the fifth surface 5. The plane 71 is a flat surface slightly inclined relative to the axial direction z. The plane 81 is located between the second curved surface 2 and the first curved surface 1 on the z2 side of the axial direction z, and is connected to the second curved surface 2 and the sixth surface 6. The plane 71 is a flat surface slightly inclined to the side opposite to the plane 71 relative to the axial direction z. The plane 71 and the plane 81 are line symmetric about the symmetry axis AS.

[0073] According to this embodiment, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, it can be understood from this embodiment that the seal of the present invention is not limited to the structure having the third curved surface 3 and the fourth curved surface 4 in the seal A10, etc. If it is a structure having the first curved surface 1 and the second curved surface 2, the reaction force can be reduced.

[0074] <First Modification of the Fourth Embodiment>

[0075] Figure 6 (b) shows a first modification of the seal A40. The seal A41 of this modification has a third curved surface 3 and a plane 81. That is, it does not have a fourth curved surface 4 that is linearly symmetrical with the third curved surface 3 about the symmetry axis AS, and a plane 71 that is linearly symmetrical with the plane 81 about the symmetry axis AS. Therefore, the seal A41 as a whole is not a shape that is linearly symmetrical with respect to the symmetry axis AS.

[0076] According to this modification, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, it can be understood from this modification that the seal of the present invention is not limited to a structure that is linearly symmetrical about the symmetry axis AS. It can be a structure that is linearly symmetrical about the symmetry axis AS or a structure that is not linearly symmetrical, for example, according to the specific shape of the sealed object.

[0077] <Second and Third Variations of the Fourth Embodiment>

[0078] Figure 7 (a) and (b) show a second modified example and a third modified example of the seal A40.

[0079] Figure 7 The seal A42 of the second modified example shown in (a) has a convex portion 72 and a convex portion 82. The convex portion 72 is provided between the second curved surface 2 and the third curved surface 3, and is a portion protruding toward the z1 side of the axial direction z. The convex portion 82 is provided between the second curved surface 2 and the fourth curved surface 4, and is a portion protruding toward the z2 side of the axial direction z.

[0080] Figure 7The seal A43 of the third modified example shown in (b) has a recessed portion 73 and a recessed portion 83. The recessed portion 73 is provided between the second curved surface 2 and the third curved surface 3, and is a portion recessed toward the z2 side of the axial direction z. The recessed portion 83 is provided between the second curved surface 2 and the fourth curved surface 4, and is a portion recessed toward the z1 side of the axial direction z.

[0081] The purpose of providing the convex portion 72 and the convex portion 82, and the concave portion 73 and the concave portion 83 is not limited in any way. Figure 3 The sealing object 91 and the sealing object 92 shown are set to a desired contact state.

[0082] According to these modified examples, it is also possible to maintain airtightness and reduce the reaction force during installation. In addition, according to these modified examples, the seal of the present invention may also have a structure in which convex portions and concave portions are formed in parts other than the first curved surface 1 and the second curved surface 2.

[0083] <Fifth Embodiment>

[0084] Figure 8 The fifth embodiment of the seal of the present invention is shown. The seal A50 of this embodiment has a plane 74 and a plane 84. The plane 74 is between the second curved surface 2 and the third curved surface 3, and in the example shown in the figure, it is connected to the second curved surface 2 and the third curved surface 3. The plane 74 is a flat surface roughly parallel to the radial direction r. The plane 84 is between the second curved surface 2 and the fourth curved surface 4, and in the example shown in the figure, it is connected to the second curved surface 2 and the fourth curved surface 4. The plane 84 is a flat surface roughly parallel to the radial direction r.

[0085] In the present embodiment, the first straight line L12 and the second straight line L22 do not intersect the second curved surface 2. That is, the second curved surface 2 of the present embodiment is set to a smaller range (angle) than, for example, the second curved surface 2 of the seal A10. However, in the present embodiment, when viewed in the radial direction r as the first direction, the second curved surface 2 also overlaps the entire first curved surface 1.

[0086] According to this embodiment, airtightness can be maintained and the reaction force during installation can be reduced. In addition, from the viewpoint of reducing the reaction force, a structure in which the second curved surface 2 intersects with the first straight line L12 and the second straight line L22 is preferred, but the present invention is not limited thereto. If the second curved surface 2 is a structure in which the entire first curved surface 1 is overlapped when viewed in the axial direction z, airtightness can be maintained and the reaction force during installation can be expected to be reduced.

[0087] The seal and the seal structure of the present invention are not limited to the above-mentioned embodiment. The specific structure of each part of the seal and the seal structure of the present invention can be freely changed in various designs.

[0088] Description of Reference Numerals

[0089] A10, A11, A12, A20, A30, A40, A41, A42, A43, A50: Seals

[0090] B10: Sealed structure

[0091] 1: First surface

[0092] 2: Second surface

[0093] 3: The third surface

[0094] 4: The fourth surface

[0095] 5: The fifth side

[0096] 6: Sixth side

[0097] 71, 74, 81, 84: plane

[0098] 72, 82: convex part

[0099] 73, 83: concave part

[0100] 91, 92: Sealed object

[0101] 911: Groove

[0102] AS: Axis of symmetry

[0103] CS: Center axis

[0104] L12: First straight line

[0105] L22: Second straight line

[0106] P1: First endpoint

[0107] P2: Second endpoint

[0108] s1: first area

[0109] s2: Second area

[0110] t0, t1, t2: thickness

[0111] z: axis direction

[0112] r: radial direction

[0113] θ: Circumferential direction

[0114] α: angle.

Claims

1. A seal, comprising: A first curved surface located at a first side in a first direction and recessed toward a second side opposite to the first side; and The second curved surface is located on the second side in the first direction and bulges toward the second side. When viewed in the first direction, the second curved surface completely overlaps with the first curved surface.

2. The seal according to claim 1, wherein: The first curved surface has: a first endpoint, which is an endpoint on a first side of a second direction orthogonal to the first direction; and a second endpoint, which is an endpoint of a second side of the second direction opposite to the first side, A first straight line obtained by extending the normal line of the first curved surface at the first end point and a second straight line obtained by extending the normal line of the first curved surface at the second end point both intersect the second curved surface.

3. The seal according to claim 2, wherein: The first curved surface and the second curved surface are respectively line symmetric about a same symmetry axis extending in the first direction.

4. The seal according to claim 3, wherein: The thickness of the portion intersecting the axis of symmetry is greater than or equal to 0.5 times and less than or equal to 3.0 times the thickness of the portion intersecting the first straight line or the second straight line.

5. The seal according to claim 2, wherein: An angle formed by the first straight line and the second straight line is greater than or equal to 60° and less than or equal to 210°.

6. The seal according to claim 1, further comprising: a third curved surface, which is located between the first curved surface and the second curved surface on the first side of a second direction orthogonal to the first direction; and A fourth curved surface, the second side of which in the second direction is between the first curved surface and the second curved surface.

7. The sealing member according to any one of claims 1 to 6, wherein: The sealing member is in a closed ring shape.

8. The seal according to claim 7, wherein: The first side of the first direction is an outer side of the ring, The second side in the first direction is an inner side of the ring.

9. A sealing structure, comprising: The seal according to claim 1; and An object to be sealed by the sealing member is sandwiched from both sides in a second direction perpendicular to the first direction.

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