Sliding member

Abstract

A sliding member is a pair of sliding members that slide relative to each other on sliding surfaces, and is characterized in that at least one of the sliding surfaces is provided with a pocket group in which a plurality of pockets are disposed, and the shape of the opening of each pocket has a long axis and a short axis that are orthogonal to each other. The pocket group is configured from a plurality of sub-pocket groups adjacent in the radial direction of the sliding surface, the plurality of sub-pocket groups adjacent in the circumferential direction are separated by a land portion, and the plurality of pockets in each of the plurality of sub-pocket groups are arranged so as to form a curve having a curvature different from the curvature of the circumference of the sliding surface. The curved line is formed by aligning the long axes or the short axes of the plurality of pockets in the plurality of sub-pocket groups, and the pockets in the plurality of sub-pocket groups are disposed from the leakage-side peripheral edge of the sliding surface to the sealed fluid-side peripheral edge.

Description

[0001] This application is a divisional application of the following application:

[0002] Invention name: Sliding component.

[0003] International filing date: April 7, 2020.

[0004] International application number: PCT / JP2020 / 015742.

[0005] National application number: 202080098179.2. Technical Field

[0006] The present invention relates to a pair of sliding components that slide relative to each other on sliding surfaces, such as mechanical seals, sliding bearings, and other sliding components suitable for sliding parts. In particular, the present invention relates to sliding components such as seal rings and bearings that require fluid to be trapped between the sliding surfaces to reduce friction and prevent fluid leakage from the sliding surfaces. Background Art

[0007] As a sealing device for preventing leakage of a sealed fluid, a sealing device (e.g., a mechanical seal) is known that consists of a pair of sliding components that slide relative to each other on sliding surfaces. In such a sealing device, a fluid lubricating film formed by the sealed fluid is required between the sliding surfaces to reduce sliding torque and maintain high sealing performance. Furthermore, as a method for achieving high sealing performance and low sliding torque, a technique is known that multiple dimples are arranged on the sliding surface.

[0008] For example, it is known that high sealing performance and low sliding torque can be achieved by arranging recesses having circular openings on a sliding surface so as to be aligned on a virtual circle centered on the rotation center of the sliding member (see, for example, Patent Document 1).

[0009] In addition, it is known that: by arranging a recess having an opening portion with a semicircular end and an elongated rectangular shape at a predetermined recess angle θ, and setting the ratio L1 / L2 of the circumferential length L1 of the recess on a circle passing through the center of the recess to the circumferential length L2 of the land portion between adjacent recesses on the circle to 0.001≤L1 / L2≤0.1, the sealing performance and sliding torque of the entire recess are adjusted to the optimum (for example, refer to Patent Document 2).

[0010] Prior art literature

[0011] Patent Literature

[0012] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-133496

[0013] Patent Document 2: Japanese Patent No. 5456772 Summary of the Invention

[0014] Problems to be solved by the invention

[0015] The technology of Patent Document 1 cannot achieve high sealing performance and low sliding torque over a wide rotation speed range, even if high sealing performance and low sliding torque can be achieved under specific operating conditions.

[0016] Furthermore, the technology of Patent Document 2 also has a fixed cavity angle. Therefore, while it can reduce leakage of the sealed fluid and lower sliding torque under specific operating conditions, it cannot achieve high sealing performance and low sliding torque over a wide rotational speed range. In particular, when used in reverse, there is a tendency for sealing performance to decrease and sliding torque to increase.

[0017] An object of the present invention is to provide a sliding component having a pair of sliding surfaces that slide relative to each other, which can achieve high sealing performance and low sliding torque even when used in a wide rotational speed range and regardless of the rotational direction.

[0018] Solutions for solving problems

[0019] In order to solve the above-mentioned problems, the sliding member of the present invention is a pair of sliding members whose sliding surfaces slide relative to each other, characterized in that:

[0020] At least one of the sliding surfaces includes a recessed group formed by arranging a plurality of recessed holes, wherein the shape of the opening of the recessed hole has a major axis and a minor axis that are orthogonal to each other,

[0021] In the dimple group, the dimples are arranged to form a curve having a curvature different from a curvature of a circumference of the sliding surface.

[0022] According to this feature, the dimples in the dimple group are arranged to form a curve having a curvature different from that of the circumference of the sliding surface, so that the angle of the dimples gradually changes along the curve. This configuration allows the dimple group to be composed of dimples having different suction and dynamic pressure effects. Consequently, the dimple group as a whole can achieve high sealing performance and low sliding torque over a wide rotational speed range.

[0023] The sliding component of the present invention is characterized in that:

[0024] The recess groups include a first recess group in which the recesses are arranged to form a curve convex toward a sealed fluid side.

[0025] According to this feature, the first pocket group is configured with pockets arranged in a curved shape convex toward the sealed fluid. Consequently, the pocket angle gradually changes along this curved shape. This configuration allows the first pocket group to be composed of pockets exhibiting different suction and dynamic pressure effects. Consequently, the pocket group as a whole can achieve high sealing performance and low sliding torque over a wide rotational speed range, and can easily be configured as a pocket group capable of bidirectional rotation.

[0026] The sliding component of the present invention is characterized in that:

[0027] The first recess group is arranged on the leakage side of the sliding surface.

[0028] According to this feature, the first pocket group is arranged on the leakage side, so that the first pocket group draws in fluid from the leakage side, thereby improving the sealing performance.

[0029] The sliding component of the present invention is characterized in that:

[0030] The recessed pocket group includes a second recessed pocket group in which the recessed pockets are arranged to form a curve convex toward a leakage side.

[0031] According to this feature, the second pocket group is arranged in a curved shape that is convex toward the leakage side. Consequently, the pocket angle gradually changes along this convex curve. This allows the second pocket group to be composed of pockets that exhibit different suction and dynamic pressure effects. As a result, the pocket group as a whole can achieve high sealing performance and low sliding torque over a wide rotational speed range, and can easily be configured as a pocket group capable of bidirectional rotation.

[0032] The sliding component of the present invention is characterized in that:

[0033] The second pocket group is arranged on the sealed fluid side of the sliding surface.

[0034] According to this feature, the second pocket group is arranged on the sealed fluid side. The second pocket group draws fluid from the sealed fluid side, pressurizes the fluid, and supplies the fluid to the sliding surface. This forms a fluid film on the sliding surface and reduces sliding torque.

[0035] The sliding component of the present invention is characterized in that:

[0036] The recess groups include a first recess group in which the recesses are arranged to form a curve convex toward a sealed fluid side; and a second recess group in which the recesses are arranged to form a curve convex toward a leakage side.

[0037] According to this feature, in the first pocket group, the pockets are arranged in a curved shape that is convex toward the sealed fluid side, and in the second pocket group, the pockets are arranged in a curved shape that is convex toward the leakage side. Therefore, the first pocket group and the second pocket group can change the angle of the pockets along their respective curves. Therefore, as a whole, the pocket group can exhibit high sealing performance and low sliding torque over a wide rotation speed range, and it is easy to form a pocket group that can rotate in both directions.

[0038] The sliding component of the present invention is characterized in that:

[0039] The first pocket group is arranged on the leakage side of the sliding surface, and the second pocket group is arranged on the sealed fluid side of the sliding surface.

[0040] According to this feature, the first dimple group arranged on the leakage side can improve sealing performance, and the second dimple group arranged on the sealed fluid side can improve lubricity, thereby achieving a sliding member having high sealing performance and lubricity.

[0041] The sliding component of the present invention is characterized in that:

[0042] The sliding member includes a circumferential groove extending along the circumferential direction between the first pocket group and the second pocket group.

[0043] According to this feature, interference between the first pocket group and the second pocket group can be prevented by the circumferential groove extending in the circumferential direction between the first pocket group and the second pocket group.

[0044] The sliding component of the present invention is characterized in that:

[0045] The sliding surface includes a plurality of regions partitioned by land portions extending in a radial direction, and the pocket groups are arranged in the regions.

[0046] According to this feature, the fluid flowing in the dimple group is blocked by the land portion and its pressure is increased, so that the sliding surface can be pushed apart and the lubricity can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a longitudinal sectional view showing an example in which the sliding component of the present invention is applied to a mechanical seal.

[0048] Figure 2 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of the sliding member according to the first embodiment of the present invention.

[0049] Figure 3 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of a sliding member according to the second embodiment of the present invention.

[0050] Figure 4 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of a sliding member according to a third embodiment of the present invention.

[0051] Figure 5 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of a sliding member according to a fourth embodiment of the present invention.

[0052] Figure 6 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of a sliding member according to a fifth embodiment of the present invention.

[0053] Figure 7 yes Figure 1 The WW view of FIG. 1 is a diagram showing an example of a sliding surface of a sliding member according to a sixth embodiment of the present invention.

[0054] Figure 8 is an example of a closed curve with a minor axis and a major axis. DETAILED DESCRIPTION

[0055] Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described exemplarily. Unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of the components described in the embodiments are not intended to limit the scope of the present invention to these dimensions.

[0056] Example 1

[0057] Reference Figure 1 and Figure 2 The sliding component of Example 1 of the present invention will now be described. While the following examples illustrate a mechanical seal as an example of a sliding component, the present invention is not limited thereto. For example, the sliding component can also be used as a bearing sliding component that seals lubricating oil on one axial side of a cylindrical sliding surface while sliding against a rotating shaft. The description will assume that the outer circumference of the sliding component constituting the mechanical seal is the sealed fluid side (high-pressure fluid side), and the inner circumference is the leakage side (low-pressure fluid side, such as the atmospheric side).

[0058] Figure 1 This is a longitudinal cross-sectional view of an example of a mechanical seal 1. This is an internal-type mechanical seal that seals against leakage of a sealed fluid from the outer periphery of a sliding surface S toward the inner periphery. It consists of a rotating-side cylinder and a stationary-side cylinder. The rotating-side cylinder includes a sleeve 2 that fits onto a rotating shaft 10; an annular rotating-side seal ring 3 that serves as one sliding member; and packing 8 that seals between the sleeve 2 and the rotating-side seal ring 3. The rotating-side cylinder rotates along with the rotating shaft 10.

[0059] The fixed side cylinder comprises: a housing 4, which is assembled on a casing 9; a circular fixed side sealing ring 5, which is a sliding component on the other side; a bellows 7, which seals between the fixed side sealing ring 5 and the housing 4; and a helical corrugated spring 6, which applies force to the fixed side sealing ring 5 toward the rotating side sealing ring 3 via the bellows 7, and the housing is fixed relative to the casing 9 in the rotational direction and axial direction.

[0060] In the mechanical seal 1 having the above structure, the sliding surface S of the rotating side seal ring 3 and the sliding surface S of the fixed side seal ring 5 slide against each other to prevent the sealed fluid from flowing from the outer peripheral side to the inner peripheral side. Figure 1 3 shows a case where the width of the sliding surface of the rotating side seal ring 3 is wider than the width of the sliding surface of the stationary side seal ring 5 , but the present invention is not limited thereto and can of course be applied to the opposite case.

[0061] The material of the rotating side seal ring 3 and the stationary side seal ring 5 is selected from silicon carbide (SiC) which is excellent in wear resistance and carbon which is excellent in self-lubrication. For example, both can be SiC or the rotating side seal ring 3 can be SiC and the stationary side seal ring 5 can be carbon.

[0062] like Figure 2 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 2 In the example, there are six regions 11. A recess group 14 is provided in each region. Recess group 14 is formed by arranging a plurality of recesses 12. Axis CL is a radial axis that divides region 11 into bilaterally symmetrical sections. Mesa portion R is a portion defining the extent of region 11 without recesses.

[0063] In the present invention, the recess 12 refers to a recess having an opening surrounded by a flat sliding surface S and a bottom recessed from the sliding surface S, and the opening 12a of the recess 12 is composed of a shape having an orthogonal major axis L and a minor axis K. In addition, the recesses 12 are separated from each other by the table portion R. In the present invention, the major axis L is a virtual line that passes through the centroid G of the shape of the opening 12a and connects the maximum width portion of the opening 12a. In addition, the minor axis K is a virtual line that passes through the centroid G and connects the openings in a manner orthogonal to the major axis L. With respect to the opening of the recess 12 in this embodiment, an ellipse having an orthogonal major axis L and a minor axis K is used as an example. However, it is not limited to an ellipse, and as long as it is a shape having an orthogonal major axis and minor axis, it may also be an oval shape, a rhombus, a polygon, or the like. Figure 8 The shape shown is composed of arbitrary closed curves 91, 92, 93, and 94.

[0064] like Figure 2 As shown, the pocket group 14 is formed by a predetermined number of auxiliary pocket groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ..., arranged radially across the land portion R. Furthermore, the auxiliary pocket groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ..., are arranged so that the major axes L of the pockets 12 are aligned to form a virtual curve 13 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket group is formed in a shape in which the major axes L of the pockets 12 are aligned and arranged tangentially to the virtual curve 13. Curve 13 is a convex curve toward the sealed fluid side and is formed by a circular arc, parabola, sine wave, cycloid, or the like having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary pocket groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... are arranged so that the pockets 12 located near the axis CL are closest to the sealed fluid, and the pockets 12 located at the ends are closest to the leakage side. Furthermore, the pockets 12 located at the ends of the auxiliary pocket groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... may be arranged tangentially to the leakage-side peripheral edge 5a or open onto the leakage-side peripheral edge 5a. Furthermore, the auxiliary pocket groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... may be configured so that the pockets 12 are symmetrically arranged with respect to the axis CL. Hereinafter, in the present invention, the circumference of the sliding surface S refers to the locus of points located at equal distances from the center C of the sliding surface S.

[0065] It should be noted that, in Example 1, the long axes L of the dimples 12 constituting the auxiliary dimple group are arranged close to each other and aligned so as to be tangent to the virtual curve 13. However, the long axes L of the dimples 12 may be arranged so as to be inclined at a predetermined angle relative to the virtual curve 13. Figure 2 The number of the auxiliary recess groups 14a, 14b, 14c, 14d, 14e, 14f, and 14g is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each area 11 is determined according to design conditions and the like.

[0066] When the rotating side seal ring 3 of the mechanical seal 1 thus constructed is Figure 2As shown, during counterclockwise rotation, the fluid between the sliding surfaces S and within the recesses 12 follow the direction of movement of the rotating-side seal ring 3 due to their viscosity. The fluid flowing into the recesses 12 experiences a dramatic expansion of its flow path, creating a negative pressure upstream of the recesses 12 and generating cavitation. However, the magnitude of the negative pressure within the cavitation is limited by the vapor pressure of the fluid, so it does not reach a significant level. Furthermore, the flow path shrinks dramatically downstream of the recesses 12, generating a positive pressure through a wedge effect (dynamic pressure effect). The negative pressure generated upstream of the recesses 12 creates a suction effect, drawing in the surrounding fluid. Meanwhile, the positive pressure generated downstream of the recesses 12 is greater than the negative pressure within the cavitation, resulting in a positive pressure within the recesses 12 as a whole. The positive pressure generated by the multiple recesses 12 arranged on the sliding surfaces S pushes the sliding surfaces S apart, allowing fluid to flow into the sliding surfaces S and achieve lubrication.

[0067] When the recesses 12 are arranged from the leakage side periphery 5a of the sliding surface S to the sealed fluid side periphery 5b, the recess group 14 can exert a pumping effect to draw the fluid from the leakage side into the sliding surface, thereby improving the sealing effect. In addition, the high-pressure fluid is drawn from the sealed fluid side and the fluid with a pressure increased by the dynamic pressure effect of the recesses 12 is supplied to the sliding surface, thereby improving the fluid lubrication effect. In particular, when Figure 2 When the recesses 12 are arranged to form a curve 13 convex toward the sealed fluid side as in the auxiliary recess groups 14a, 14b, ..., the sealing effect of the recess group 14 can be improved compared to the recess group in which the recesses are arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0068] Furthermore, the recess 12 has an elliptical opening 12a with orthogonal major and minor axes. Therefore, depending on the inclination of the major axis L, the suction effect and dynamic pressure effect of the recess 12 differ. When the major axis is oriented at 0 degrees relative to the sliding direction, the fluid retention function of the recess 12 is enhanced. When the major axis is oriented at 45 degrees relative to the sliding direction, the suction effect is enhanced. Furthermore, when the major axis is oriented at 90 degrees relative to the sliding direction, the dynamic pressure effect is enhanced. In this way, even with the same elliptical recess 12, the suction effect or the dynamic pressure effect can be enhanced by varying the inclination of the major axis L of the recess 12.

[0069] Furthermore, in the auxiliary pocket groups 14a, 14b, ..., the pockets 12 are arranged to form a curve 13, so the angle of the major axis L of each pocket 12 gradually changes along curve 13. Consequently, because the direction of the major axis L of each pocket 12 gradually changes along curve 13, the auxiliary pocket groups 14a, 14b, ..., are composed of pockets 12 having different suction and dynamic pressure effects. Even when used over a wide rotational speed range, the mechanical seal 1 maintains high suction and dynamic pressure effects at each rotational speed, resulting in the pocket group 14 as a whole exhibiting high sealing and lubrication properties.

[0070] Furthermore, the auxiliary cavity groups 14a, 14b, ... are arranged to form a curve 13 convex toward the sealed fluid side and are substantially symmetrical with respect to the axis CL, thereby exhibiting high sealing and lubricating functions not only during forward rotation but also during reverse rotation.

[0071] As described above, the sliding member of the present invention has the following effects.

[0072] 1. The pockets 12 constituting the pocket group 14 have a suction effect for sucking in fluid due to negative pressure generated on the upstream side, and a lubrication function is achieved by supplying fluid with pressurized fluid due to the wedge effect on the downstream side to the sliding surface.

[0073] 2. When the recesses 12 are arranged from the leakage side periphery 5a of the sliding surface S to the sealed fluid side periphery 5b, the recess group 14 can exert a pumping effect to draw the fluid from the leakage side into the sliding surface, thereby improving the sealing effect. In addition, high-pressure fluid is drawn from the sealed fluid side and supplied to the sliding surface with the fluid pressurized by the dynamic pressure effect of the recesses 12, thereby improving the fluid lubrication effect.

[0074] 3. When Figure 2 When the recesses 12 are arranged to form a curve 13 convex toward the sealed fluid side as in the auxiliary recess groups 14a, 14b, ..., the sealing effect of the recess group 14 can be improved compared to the recess group in which the recesses are arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0075] 4. The recess 12 has an elliptical opening 12a with orthogonal major and minor axes. Therefore, the strength of the suction effect and dynamic pressure effect of the recess 12 can be varied by changing the inclination of the major axis L. Thus, even with the same elliptical recess 12, the suction effect or the dynamic pressure effect can be enhanced by changing the inclination of the major axis L of the recess 12.

[0076] 5. In auxiliary pocket groups 14a, 14b, ..., the pockets 12 are arranged to form a curve 13, so the angle of the major axis L of each pocket 12 gradually changes along curve 13. Consequently, because the direction of the major axis L of each pocket 12 gradually changes along curve 13, auxiliary pocket groups 14a, 14b, ... are composed of pockets 12 with different suction and dynamic pressure effects. Even when used over a wide rotational speed range, the mechanical seal 1 maintains high suction and dynamic pressure effects at each rotational speed, resulting in the pocket group 14 as a whole exhibiting high sealing and lubrication properties.

[0077] 6. The pocket groups 14 are arranged to form a curve 13 convex toward the sealed fluid side and are substantially symmetrical with respect to the axis CL. Therefore, high suction effect and dynamic pressure effect are exerted not only during forward rotation but also during reverse rotation.

[0078] Example 2

[0079] A sliding component according to a second embodiment of the present invention will be described. Figure 3 The sliding surface S of the sliding member of Example 2 is shown. This differs from Example 1 in that the auxiliary recess groups 24a, 24b, ... are arranged to form a curve 23 that is convex toward the leakage side. The remaining configuration is the same as that of Example 1. Hereinafter, the same reference numerals are assigned to the same components and configurations as those of Example 1, and duplicate descriptions are omitted.

[0080] like Figure 3 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 3 In the example, there are six regions 21. A recess group 24 is provided in each region. The recess group 24 is formed by arranging a plurality of recesses 22. The axis CL is a radial axis that divides the region 21 into bilaterally symmetrical portions.

[0081] like Figure 3As shown, the pocket group 24 is formed by a predetermined number of auxiliary pocket groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ..., arranged radially across the land portion R. The auxiliary pocket groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ..., are arranged so that the major axes L of the pockets 22 are aligned to form a virtual curve 23 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket groups are formed in a shape in which the major axes L of the pockets 22 are aligned to be tangent to the virtual curve 23. The curve 23 is convex toward the leakage side and is formed by a circular arc, parabola, sine wave, cycloid, or the like having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... are arranged so that the recesses 22 arranged near the axis CL are closest to the leakage side, and the recesses 22 arranged at both ends are closest to the sealed fluid side. Furthermore, the recesses 22 arranged at both ends of the auxiliary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... may be arranged so as to be tangential to the sealed fluid side peripheral edge 5b or to open at the sealed fluid side peripheral edge 5b. Furthermore, the auxiliary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... may also be constructed so that the recesses 22 are symmetrically arranged relative to the axis CL. It should be noted that for the sake of explanation, only the recesses 22 are symmetrically arranged relative to the axis CL. Figure 3 The number of the auxiliary recess groups 24a, 24b, 24c, 24d, 24e, 24f, and 24g is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each region 21 is determined based on design conditions and the like.

[0082] When the pockets 22 are arranged close to each other to form the shape of the curve 23 as in the auxiliary pocket groups 24a, 24b, ..., suction and discharge are continuously repeated between the adjacent pockets 22. Therefore, when the pockets 22 are arranged from the leakage side peripheral edge 5a of the sliding surface S, the suction and discharge are continuously repeated between the adjacent pockets 22.

[0083] When the recessed pockets 24 are positioned to the sealed fluid side periphery 5b, they can exert a pumping effect by drawing fluid from the leaking side into the sliding surface, thereby reducing leakage. In addition, high-pressure fluid is drawn from the sealed fluid side and supplied to the sliding surface, where the fluid is pressurized by the dynamic pressure effect of the recessed pockets 22, thereby enhancing the fluid lubrication effect. In particular, if Figure 3 As shown, when the dimples 22 are arranged to form a curve 23 convex toward the leakage side like the auxiliary dimple groups 24a, 24b, ..., the fluid lubrication effect of the dimple group 24 can be made stronger than the sealing effect.

[0084] Furthermore, in the auxiliary pocket groups 24a, 24b, ..., the pockets 22 are arranged to form a curve 23. Therefore, the angle of the major axis L of each pocket 22 gradually changes along the curve 23, and the suction effect and dynamic pressure effect of each pocket also gradually change along the curve 23. In other words, the auxiliary pocket groups 24a, 24b, ... are configured with pockets 22 having different suction and dynamic pressure effects. Therefore, even when used over a wide rotational speed range, pockets 22 that exhibit high suction and dynamic pressure effects are present at each rotational speed. Furthermore, by arranging the pocket group 24, which includes multiple auxiliary pocket groups 24a, 24b, ..., arranged radially in each region 21 of the sliding surface, the pocket group 24 as a whole can exert a lubricating function even when used over a wide rotational speed range.

[0085] Furthermore, the auxiliary recess groups 24a, 24b, ... are arranged to form a curve 23 convex toward the leakage side and are substantially symmetrical with respect to the axis CL, and thus exhibit a high lubrication function not only during forward rotation but also during reverse rotation.

[0086] As described above, the sliding member of Example 2 has the following effects.

[0087] 1. The pockets 22 constituting the pocket group 24 have a negative pressure on their upstream side, thereby exhibiting a suction function of sucking in fluid and a lubrication function of discharging fluid pressurized by a wedge effect on the downstream side.

[0088] 2. When the pockets 22 are arranged from the leakage-side periphery 5a of the sliding surface S to the sealed fluid-side periphery 5b, the pocket group 24 can exert a pumping effect by drawing fluid from the leakage side into the sliding surface, thereby reducing leakage. Furthermore, by drawing high-pressure fluid from the sealed fluid side and supplying the fluid, whose pressure has been increased by the dynamic pressure effect of the pockets 22, to the sliding surface, the fluid lubrication effect can be enhanced.

[0089] 3. When Figure 3 When the recesses 22 are arranged in the shape of a curve 23 convex toward the leakage side as in the auxiliary recess groups 24a, 24b, ..., the fluid lubrication effect of the recess group 24 can be improved compared to the recess group in which the recesses are arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0090] 4. The recess 22 has an elliptical opening 22a with orthogonal major and minor axes. Therefore, the strength of the suction effect and dynamic pressure effect of the recess 22 can be varied by changing the inclination of the major axis L. Thus, even with the same elliptical recess 22, the suction effect or dynamic pressure effect can be enhanced by changing the inclination of the major axis L of the recess 22.

[0091] 5. In the auxiliary pocket groups 24a, 24b, ..., the pockets 22 are arranged to form a curve 23. Therefore, the angle of the major axis L of each pocket 22 gradually changes along the curve 23, and the suction effect and dynamic pressure effect of each pocket also gradually change along the curve 23. That is, the auxiliary pocket groups 24a, 24b, ... are configured with pockets 22 having different suction and dynamic pressure effects. Therefore, even when used over a wide rotational speed range, pockets 22 that exhibit high suction and dynamic pressure effects are present at each rotational speed. Furthermore, by arranging the pocket group 24, which includes multiple auxiliary pocket groups 24a, 24b, ..., arranged radially in each region 21 of the sliding surface, the pocket group 24 as a whole can exert a lubricating function even when used over a wide rotational speed range.

[0092] 6. The auxiliary recess groups 24a, 24b, ... are arranged to form a curve 23 convex toward the leakage side and are substantially symmetrical with respect to the axis CL, thus exhibiting a high lubrication function not only during forward rotation but also during reverse rotation.

[0093] Example 3

[0094] A sliding member according to a third embodiment of the present invention will be described. Figure 4 The sliding surface S of the sliding member of Example 3 is shown. This differs from Example 1 in that the recess groups 34 are arranged so that the minor axes K of adjacent recesses 32 are close to each other and aligned, forming a curved line 33 that is convex toward the sealed fluid. The remaining configuration is the same as that of Example 1. Hereinafter, the same reference numerals are assigned to the same components and configurations as those of Example 1, and duplicate descriptions are omitted.

[0095] like Figure 4 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 4 In the example, there are six regions 31. A recess group 34 is provided in each region. The recess group 34 is formed by arranging a plurality of recesses 32. The axis CL is a radial axis that divides the region 31 into bilaterally symmetrical portions.

[0096] like Figure 4As shown, the pocket group 34 is formed by a predetermined number of auxiliary pocket groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ..., arranged radially across the land portion R. The auxiliary pocket groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ..., are arranged so that the minor axes K of the pockets 32 are aligned to form a virtual curve 33 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket groups are formed in a shape in which the minor axes K of the pockets 32 are aligned so as to be tangential to the virtual curve 33. The curve 33 is convex toward the sealed fluid side and is formed by a circular arc, parabola, sine wave, cycloid, or the like having a curvature different from that of the circumference of the sliding surface S. In addition, the auxiliary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... are arranged so that the recess 32 arranged near the axis CL is closest to the sealed fluid side, and the recess 32 arranged at both ends is closest to the leakage side. In addition, the recesses 32 arranged at both ends of the auxiliary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... can also be arranged so as to be tangent to the leakage side peripheral edge 5a or to open at the leakage side peripheral edge 5a. Moreover, the auxiliary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... can also be constructed so that the recesses 32 are symmetrically arranged relative to the axis CL. Here, the curve 33 is a virtual curve tangent to the short axis K of the recess 32. It should be noted that for the sake of explanation, only the recesses 32 are symmetrically arranged relative to the axis CL. Figure 4 The number of the auxiliary recess groups 34a, 34b, 34c, 34d, 34e, 34f, and 34g is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each region 31 is determined based on design conditions and the like.

[0097] In Example 3, by arranging the major axis L of the recess 32 in the radial direction, the dynamic pressure effect of the recess 32 can be made higher than the sealing effect. This improves the lubrication effect of the sliding surface S as a whole and reduces the sliding torque.

[0098] In addition, when Figure 4 When the recesses 32 are arranged to form a curve 33 convex toward the sealed fluid side as in the auxiliary recess groups 34a, 34b, ..., the sealing effect of the recess group 34 can be improved compared to the recess group arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0099] Furthermore, in the auxiliary pocket groups 34a, 34b, ..., the pockets 32 are arranged to form a curve 33, so the angle of the minor axis K of each pocket 32 ​​gradually changes along the curve 33. Consequently, the suction effect and dynamic pressure effect of each pocket 32 ​​gradually change along the curve 33. That is, the auxiliary pocket groups 34a, 34b, ... are configured with pockets 32 that exhibit different suction and dynamic pressure effects. Therefore, even when used over a wide rotational speed range, pockets 32 that exhibit high suction and dynamic pressure effects are present at each rotational speed. Furthermore, by arranging the pocket group 34, which includes multiple auxiliary pocket groups 34a, 34b, ..., arranged radially in each region 31 of the sliding surface, the pocket group 34 as a whole exhibits high sealing and lubrication functions, even when used over a wide rotational speed range.

[0100] Furthermore, the auxiliary cavity groups 34a, 34b, ... are arranged to form a curve 33 convex toward the sealed fluid side and are substantially symmetrical with respect to the axis CL, thereby exhibiting high sealing and lubricating functions not only during forward rotation but also during reverse rotation.

[0101] As described above, the sliding member of the third embodiment not only achieves the effects of the first embodiment but also achieves the following effects.

[0102] 1. By arranging the long axis L of the recess 32 in the radial direction, the dynamic pressure effect of the recess 32 can be made higher than the sealing effect. This improves the lubrication effect of the sliding surface S as a whole and reduces the sliding torque.

[0103] 2. When Figure 4 When the recesses 32 are arranged to form a curve 33 convex toward the sealed fluid side as in the auxiliary recess groups 34a, 34b, ..., the sealing effect of the recess group 34 can be improved compared to the recess group arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0104] Example 4

[0105] A sliding component according to a fourth embodiment of the present invention will be described. Figure 5 The sliding surface S of the sliding member of Example 4 is shown. This embodiment differs from Example 1 in that the recess groups 44 are arranged so that the minor axes K of adjacent recesses 42 are close to each other and aligned to form a curved line 43 that is convex toward the leakage side. The remaining configuration is the same as that of Example 1. Hereinafter, the same reference numerals are assigned to the same components and configurations as those of Example 1, and duplicate descriptions are omitted.

[0106] like Figure 5 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 5In the example, there are six regions 41. A recess group 44 is provided in each region. The recess group 44 is formed by arranging a plurality of recesses 42. The axis CL is a radial axis that divides the region 41 into bilaterally symmetrical portions.

[0107] like Figure 5 As shown, the pocket group 44 is formed by a predetermined number of auxiliary pocket groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ..., arranged radially across the land portion R. The auxiliary pocket groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ..., are arranged so that the minor axes K of the pockets 42 are aligned to form a virtual curve 43 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket groups are formed in a shape in which the minor axes K of the pockets 42 are aligned so as to be tangential to the virtual curve 43. The curve 43 is convex toward the leakage side and is formed by a circular arc, parabola, sine wave, cycloid, or the like having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... are arranged so that the recess 42 arranged near the axis CL is closest to the leakage side, and the recess 42 arranged at both ends is closest to the sealed fluid side. Furthermore, the recess 42 arranged at both ends of the auxiliary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... may be arranged so as to be tangential to the sealed fluid side peripheral edge 5b or to open at the sealed fluid side peripheral edge 5b. Furthermore, the auxiliary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... may also be constructed so that the recesses 42 are symmetrically arranged relative to the axis CL. It should be noted that for the sake of explanation, only the recesses 42 are symmetrically arranged relative to the axis CL. Figure 5 The number of the auxiliary recess groups 44a, 44b, 44c, 44d, 44e, 44f, and 44g is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each region 41 is determined according to design conditions and the like.

[0108] By arranging the major axis L of the pocket 42 in the radial direction, the dynamic pressure effect of the pocket 42 can be made higher than the sealing effect. This improves the lubrication effect of the sliding surface S as a whole and reduces the sliding torque.

[0109] When Figure 5 When the recesses 42 are arranged in the shape of a curve 43 convex toward the leakage side as in the auxiliary recess groups 44a, 44b, ..., the fluid lubrication effect of the recess group 44 can be improved compared to the recess group in which the recesses are arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0110] Furthermore, the pockets 42 in the auxiliary pocket groups 44a, 44b, ... are arranged to form a curve 43, so the angle of the major axis L of each pocket 42 gradually changes along the curve 43. Consequently, the suction effect and dynamic pressure effect of each pocket 42 gradually change along the curve 43. That is, the auxiliary pocket groups 44a, 44b, ... are configured with pockets 42 that exhibit different suction and dynamic pressure effects. Therefore, even when used over a wide rotational speed range, pockets 42 that exhibit high suction and dynamic pressure effects are present at each rotational speed. Furthermore, by arranging pocket groups 44, each of which includes multiple auxiliary pocket groups 44a, 44b, ... arranged radially in each region 41 of the sliding surface, the pocket groups 44 as a whole exhibit high sealing and lubrication functions, even when used over a wide rotational speed range.

[0111] Furthermore, the auxiliary recess groups 44a, 44b, ... are arranged to form a curve 43 convex toward the leakage side and are substantially symmetrical with respect to the axis CL, thereby exhibiting high sealing and lubricating functions not only during forward rotation but also during reverse rotation.

[0112] As described above, the sliding member of the fourth embodiment not only achieves the effects of the second embodiment but also achieves the following effects.

[0113] 1. By arranging the long axis L of the recess 42 in the radial direction, the dynamic pressure effect of the recess 42 can be made higher than the sealing effect. This improves the lubrication effect of the sliding surface S as a whole and reduces the sliding torque.

[0114] 2. When Figure 5 When the recesses 42 are arranged to form a curve 43 convex toward the leakage side as in the auxiliary recess groups 44a, 44b, ..., the fluid lubrication effect of the recess group 44 can be improved compared to the recess group in which the recesses are arranged in a concentric circle shape in the circumferential direction of the sliding surface S.

[0115] Example 5

[0116] A sliding member according to a fifth embodiment of the present invention will be described. Figure 6 The sliding surface S of the sliding member of Example 5 is shown. It differs from Example 1 in that it includes a group of recesses 54 arranged on the leakage side to form a curved line 53 convex toward the sealed fluid side, and a group of recesses 59 arranged on the sealed fluid side to form a curved line 58 convex toward the leakage side. The remaining configuration is the same as that of Example 1. Hereinafter, the same reference numerals are assigned to the same components and configurations as those of Example 1, and duplicate descriptions are omitted.

[0117] like Figure 6 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 6In the example, there are six regions 51. Pocket groups 54 and 59 are provided in each region. Pocket group 54 is composed of a plurality of pockets 52 arranged in an array, and pocket group 59 is composed of a plurality of pockets 57 arranged in an array. Axis CL is a radial axis that divides region 51 into bilaterally symmetrical portions.

[0118] A pocket group 54 is arranged on the leakage side of the sliding surface S. The pocket group 54 is formed by a predetermined number of auxiliary pocket groups 54a, 54b, 54c, 54d, ..., arranged radially across the land portion R. Furthermore, the auxiliary pocket groups 54a, 54b, 54c, 54d, ..., are arranged so that the major axes L of the pockets 52 are aligned to form a virtual curve 53 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket group is formed so that the major axes L of the pockets 52 are aligned and tangent to the virtual curve 53. The curve 53 is convex toward the sealed fluid side and is formed by a circular arc, parabola, sine wave, cycloid, or the like having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary recess groups 54a, 54b, 54c, 54d, ... are arranged such that the recesses 52 arranged near the axis CL are closest to the sealed fluid side, and the recesses 52 arranged at both ends away from the axis CL are closest to the leakage side. Furthermore, the recesses 52 arranged at both ends of the auxiliary recess groups 54a, 54b, 54c, 54d, ... may be arranged so as to be tangential to the leakage side peripheral edge 5a or open at the leakage side peripheral edge 5a. Furthermore, the auxiliary recess groups 54a, 54b, 54c, 54d, ... may also be constructed so that the recesses 52 are symmetrically arranged relative to the axis CL. It should be noted that for the sake of explanation, only the recesses 52 are shown in FIG. Figure 6 The number of the auxiliary recess groups 54a, 54b, 54c, and 54d is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each region 51 is determined based on design conditions and the like.

[0119] A pocket group 59 is provided on the sealed fluid side of the sliding surface S. The pocket group 59 is formed by a predetermined number of auxiliary pocket groups 59a, 59b, 59c, ..., arranged radially across the land portion R. The auxiliary pocket groups 59a, 59b, 59c, ... are arranged so that the major axes L of the pockets 57 are aligned to form a virtual curve 58 having a curvature different from that of the circumference of the sliding surface S. In other words, the auxiliary pocket group forms a shape in which the major axes L of the pockets 57 are aligned so as to be tangential to the virtual curve 58. Curve 58 is convex toward the leakage side and is formed by an arc, parabola, sine wave, cycloid, or other curve having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary pocket groups 59a, 59b, 59c, ..., are arranged so that the pockets 57 located near the axis CL are closest to the leakage side, while the pockets 57 located at the ends are closest to the sealed fluid side. Furthermore, the recesses 57 arranged at both ends of the auxiliary recess groups 59a, 59b, 59c, ... may be arranged to be tangential to the sealed fluid side periphery 5b or to open at the sealed fluid side periphery 5b. Furthermore, the auxiliary recess groups 59a, 59b, 59c, ... may also be constructed so that the recesses 57 are arranged symmetrically with respect to the axis CL. It should be noted that for the sake of explanation, only the Figure 6 The surrounding portion shows the reference numerals of the auxiliary recess groups 59a, 59b, 59c.

[0120] Compared to concentrically arranged dimples in the circumferential direction of the sliding surface S, the dimple group 54, which is arranged on the leakage side of the sliding surface S and forms a convex curve 53 toward the sealed fluid side, exhibits higher sealing performance. Furthermore, compared to concentrically arranged dimples in the circumferential direction of the sliding surface S, the dimple group 59, which is arranged on the sealed fluid side of the sliding surface S and forms a convex curve 58 toward the leakage side of the sliding surface S, exhibits a higher lubrication effect. By arranging the dimple group 54, which excels in sealing performance, and the dimple group 59, which excels in lubrication performance, on the sliding surface S, the mechanical seal 1 can exhibit both excellent sealing and lubricity.

[0121] Pocket group 54 is arranged to form a curve 53 that is convex toward the sealed fluid and is substantially symmetrical about axis CL. This allows for high sealing performance not only during forward rotation but also during reverse rotation. Furthermore, pocket group 59 is arranged to form a curve 58 that is convex toward the leakage side and is substantially symmetrical about axis CL. This provides a lubricating function not only during forward rotation but also during reverse rotation, resulting in high sealing and lubrication performance regardless of the direction of rotation.

[0122] As described above, the sliding member of the fifth embodiment not only achieves the effects of the first and second embodiments but also achieves the following effects.

[0123] 1. Compared to concentrically arranged dimples in the circumferential direction of the sliding surface S, the dimple group 54, which is located on the leakage side of the sliding surface S and arranged to form a curve 53 convex toward the sealed fluid side, can achieve higher sealing performance. Furthermore, compared to concentrically arranged dimples in the circumferential direction of the sliding surface S, the dimple group 59, which is located on the sealed fluid side of the sliding surface S and arranged to form a curve 58 convex toward the leakage side of the sliding surface S, can achieve higher lubrication performance.

[0124] 2. The recess groups 54 are arranged substantially symmetrically with respect to the axis CL, and the recess groups 59 are arranged substantially symmetrically with respect to the axis CL. Therefore, high sealing performance and lubrication performance can be exhibited regardless of the rotation direction.

[0125] Example 6

[0126] A sliding component according to a sixth embodiment of the present invention will be described. Figure 7 The sliding surface S of the sliding member of Example 6 is shown. This differs from Example 5 in that a groove portion is provided between a group of recesses 64 arranged on the leakage side to form a curved line 63 convex toward the sealed fluid side and a group of recesses 69 arranged on the sealed fluid side to form a curved line 68 convex toward the leakage side. The remaining configuration is the same as that of Example 5. Hereinafter, the same reference numerals are assigned to the same components and configurations as those of Example 5, and duplicate descriptions are omitted.

[0127] like Figure 7 As shown, the sliding surface S of the fixed side seal ring 5 is divided into a predetermined number of land portions R provided from the sealed fluid side to the leakage side (in Figure 7 In the example, there are six regions 61. Pocket groups 64 and 69 are provided in each region. Pocket group 64 is composed of a plurality of pockets 62 arranged in an array, and pocket group 69 is composed of a plurality of pockets 67 arranged in an array. Axis CL is a radial axis that divides region 61 into bilaterally symmetrical portions.

[0128] On the leakage side of the sliding surface S, a pocket group 64 is arranged to form a curve 63 convex toward the sealed fluid, similar to Example 5. The pocket group 64 is formed by a predetermined number of sub-pocket groups 64a, 64b, 64c, 64d, ..., arranged radially across the land portion R. The sub-pocket groups 64a, 64b, 64c, 64d, ..., are arranged so that the major axes L of the pockets 62 are aligned, forming a virtual curve 63 having a curvature different from that of the circumference of the sliding surface S. Curve 63 is a curve convex toward the sealed fluid and is formed by a circular arc, parabola, sine wave, cycloid, or other curve having a curvature different from that of the circumference of the sliding surface S. Furthermore, the sub-pocket groups 64a, 64b, 64c, 64d, ..., are arranged so that the pockets 62 located near the axis CL are closest to the sealed fluid, while the pockets 62 located at the ends are closest to the leakage side. In addition, the recesses 62 arranged at both ends of the auxiliary recess groups 64a, 64b, 64c, 64d, ... may be arranged to be tangential to the leakage side peripheral edge 5a or open at the leakage side peripheral edge 5a. Furthermore, the auxiliary recess groups 64a, 64b, 64c, 64d, ... may also be constructed so that the recesses 62 are arranged symmetrically with respect to the axis CL. It should be noted that for the sake of explanation, only the Figure 7 The number of the auxiliary recess groups 64a, 64b, 64c, and 64d is shown in the portion surrounded by . The number of auxiliary recess groups arranged in each region 61 is determined based on design conditions and the like.

[0129] On the sealed fluid side of the sliding surface S, similar to Example 5, a group of dimples 69 is arranged to form a curve 68 convex toward the leakage side. The dimple group 69 is formed by a predetermined number of auxiliary dimple groups 69a, 69b, 69c, ..., arranged radially across the land portion R. The auxiliary dimple groups 69a, 69b, 69c, ..., are arranged so that the major axes L of the dimples 67 are aligned, forming a virtual curve 68 having a curvature different from that of the circumference of the sliding surface S. Curve 68 is a curve convex toward the leakage side and is formed by a circular arc, parabola, sine wave, cycloid, or other curve having a curvature different from that of the circumference of the sliding surface S. Furthermore, the auxiliary dimple groups 69a, 69b, 69c, ..., are arranged so that the dimples 67 located near the axis CL are closest to the leakage side, while the dimples 67 located at the ends are closest to the sealed fluid side. In addition, the recesses 67 arranged at both ends of the auxiliary recess groups 69a, 69b, 69c, ... may be arranged to be tangential to the sealed fluid side peripheral edge 5b or open to the sealed fluid side peripheral edge 5b. Moreover, the auxiliary recess groups 69a, 69b, 69c, ... may also be constructed so that the recesses 67 are arranged symmetrically with respect to the axis CL. It should be noted that for the sake of explanation, only the Figure 7 The surrounding portion shows the reference numerals of the auxiliary recess groups 69a, 69b, and 69c.

[0130] Groove 65 is provided between recess group 64 and recess group 69. Groove 65 is formed sufficiently deeper than recesses 62 constituting recess group 64 and recesses 67 constituting recess group 69 and sufficiently larger than the openings of recesses 62 and 67.

[0131] The recessed pocket group 64, located on the leakage side of the sliding surface S and arranged to form a curve 63 convex toward the sealed fluid side, draws fluid in from the leakage side, thereby achieving high sealing performance. Furthermore, the recessed pocket group 69, located on the sealed fluid side of the sliding surface S and arranged to form a curve 68 convex toward the leakage side of the sliding surface S, draws fluid in from the sealed fluid side and discharges the pressurized fluid from the recessed pockets 67 toward the sliding surface S, thereby maintaining the sliding surface S in a fluid-lubricated state. By arranging the recessed pocket group 64, which excels in sealing performance, and the recessed pocket group 69, which excels in lubrication performance, on the sliding surface S, the mechanical seal 1 achieves excellent sealing and lubrication properties.

[0132] Furthermore, grooves 65 are provided between recess groups 64 and 69, thereby preventing interference between recess groups 64 and 69. This prevents the sealing properties of recess groups 64 and 69 from canceling out the lubricating properties of recess groups 64 and 69 in areas where recess groups 64 and 69 are close to each other.

[0133] The recess group 64 is arranged to form a curve 63 that is convex toward the sealed fluid side and is substantially symmetrical with respect to the axis CL. Therefore, it can exhibit high sealing performance not only in forward rotation but also in reverse rotation. The recess group 69 is arranged to form a curve 68 that is convex toward the leakage side and is substantially symmetrical with respect to the axis CL. Therefore, it can exhibit a lubricating function not only in forward rotation but also in reverse rotation. Therefore, it can exhibit high sealing performance and lubrication performance regardless of the rotation direction.

[0134] As described above, the sliding member of Example 6 not only achieves the effects of Example 5 but also achieves the following effects.

[0135] The mechanical seal of Example 6 also includes grooves 65 between the recess groups 64 and 69, thereby preventing interference between the recess groups 64 and 69. This prevents the sealing properties of the recess groups 64 and 69 from being cancelled out in areas where the recess groups 64 and 69 are close to each other.

[0136] While the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions that do not depart from the gist of the present invention are also included in the present invention.

[0137] In the above embodiment, the outer peripheral side is set as the sealed fluid side and the inner peripheral side is set as the leakage side, but the present invention is not limited thereto and can also be applied when the inner peripheral side is the sealed fluid side and the outer peripheral side is the leakage side.

[0138] Description of Reference Numerals

[0139] 1: Mechanical seal;

[0140] 2: sleeve;

[0141] 3: Rotating side sealing ring;

[0142] 4: Shell;

[0143] 5: Fixed side sealing ring;

[0144] 6: spiral corrugated spring;

[0145] 7: Bellows;

[0146] 8: seal;

[0147] 9: box;

[0148] 10: rotation axis;

[0149] 11: Region;

[0150] 12: concave;

[0151] 14: concave group;

[0152] 14a: auxiliary concave group;

[0153] 14b: auxiliary concave group;

[0154] 14c: auxiliary pit group;

[0155] 14d: auxiliary pit group;

[0156] 14e: auxiliary pit group;

[0157] 14f: auxiliary pit group;

[0158] 14g: accessory concave group;

[0159] 21: Region;

[0160] 22: concave;

[0161] 24: concave group;

[0162] 24a: auxiliary concave group;

[0163] 24b: auxiliary concave group;

[0164] 24c: auxiliary pit group;

[0165] 24d: auxiliary pit group;

[0166] 24e: auxiliary pit group;

[0167] 24f: auxiliary pit group;

[0168] 31: Region;

[0169] 32: concave;

[0170] 34: concave group;

[0171] 34a: auxiliary concave group;

[0172] 34b: auxiliary concave group;

[0173] 34c: auxiliary pit group;

[0174] 34d: auxiliary pit group;

[0175] 34e: auxiliary pit group;

[0176] 34f: auxiliary pit group;

[0177] 34g: auxiliary concave group;

[0178] 41: Region;

[0179] 42: concave;

[0180] 44: concave group;

[0181] 44a: auxiliary concave group;

[0182] 44b: auxiliary concave group;

[0183] 44c: auxiliary pit group;

[0184] 44d: auxiliary pit group;

[0185] 44e: auxiliary concave group;

[0186] 44f: auxiliary pit group;

[0187] 44g: auxiliary concave group;

[0188] 51: Region;

[0189] 52: concave;

[0190] 54: concave group;

[0191] 54a: auxiliary concave group;

[0192] 54b: auxiliary pit group;

[0193] 54c: auxiliary pit group;

[0194] 54d: auxiliary pit group;

[0195] 57: concave;

[0196] 59: concave group;

[0197] 59a: auxiliary pit group;

[0198] 59b: auxiliary pit group;

[0199] 59c: auxiliary pit group;

[0200] 61: Region;

[0201] 62: concave;

[0202] 64: concave group;

[0203] 64a: auxiliary concave group;

[0204] 64b: auxiliary concave group;

[0205] 64c: auxiliary pit group;

[0206] 64d: auxiliary pit group;

[0207] 65: groove;

[0208] 67: concave;

[0209] 69: concave group;

[0210] 69a: auxiliary pit group;

[0211] 69b: auxiliary pit group;

[0212] 69c: auxiliary pit group;

[0213] K: minor axis;

[0214] L: long axis;

[0215] R: countertop;

[0216] S: sliding surface.

Claims

1. A sliding component, comprising a pair of sliding components that slide relative to each other on sliding surfaces, characterized in that: At least one sliding surface includes a recessed pocket group formed by arranging a plurality of recessed pockets, wherein the opening of each recessed pocket has a shape having a major axis and a minor axis that are orthogonal to each other, wherein the recessed pocket group is composed of a plurality of auxiliary recessed pocket groups adjacent in the radial direction of the sliding surface, and wherein the plurality of auxiliary recessed pocket groups adjacent in the circumferential direction are separated by a land portion. The plurality of recesses in each of the plurality of auxiliary recess groups are arranged to form a curve having a curvature different from the curvature of the circumference of the sliding surface, the curve being formed by aligning the major axes or the minor axes of the plurality of recesses in the auxiliary recess group. The pockets in the plurality of auxiliary pocket groups are arranged from the leakage-side periphery of the sliding surface to the sealed fluid-side periphery.

2. The sliding component according to claim 1, wherein The pocket group includes a first auxiliary pocket group in which the pockets are arranged to form a curve convex toward a sealed fluid side.

3. The sliding component according to claim 2, wherein: The first auxiliary recess group is arranged on the leakage side of the sliding surface.

4. The sliding component according to claim 1, wherein The recess group includes a second auxiliary recess group, wherein the recesses of the second auxiliary recess group are arranged to form a curve convex toward a leakage side.

5. The sliding component according to claim 4, characterized in that The second auxiliary pocket group is arranged on the sealed fluid side of the sliding surface.

6. The sliding component according to claim 1, wherein The recess group includes a first auxiliary recess group in which the recesses are arranged to form a curve convex toward the sealed fluid side; and a second auxiliary recess group in which the recesses are arranged to form a curve convex toward the leakage side.

7. The sliding component according to claim 6, characterized in that The first auxiliary pocket group is arranged on the leakage side of the sliding surface, and the second auxiliary pocket group is arranged on the sealed fluid side of the sliding surface.

8. The sliding component according to claim 6 or 7, characterized in that: The invention includes a circumferential groove extending along the circumferential direction between the first auxiliary pocket group and the second auxiliary pocket group.

9. The sliding component according to any one of claims 1 to 7, characterized in that The sliding surface includes a plurality of regions partitioned by land portions extending in a radial direction, and the pocket groups are arranged in the regions.

10. The sliding component according to any one of claims 1 to 7, characterized in that The opening of the cavity is elliptical.

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