sliding member

Abstract

The present invention provides a sliding member that can achieve high sealing performance and low sliding torque even when used in a wide rotational speed range and regardless of the rotational direction in a pair of sliding members that slide against each other. The present invention is a pair of sliding members that slide against each other, wherein at least one of the sliding surfaces (S) is provided with a pocket group (14) in which a plurality of pockets (12) are arranged, the opening of the pocket has a shape with an orthogonal long axis (L) and a short axis (K), and in the pocket group (14), the pockets (12) are arranged to form a curve having a curvature different from that of the circumference of the sliding surface (S).

Description

Technical Field

[0001] This 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 portions. In particular, it relates to a sliding component such as a sealing ring or bearing that requires fluid to be trapped on the sliding surfaces to reduce friction and prevent fluid leakage from the sliding surfaces. Background Technology

[0002] As a sealing device to prevent leakage of the sealed fluid, a sealing device (e.g., a mechanical seal) consisting of a pair of sliding parts that slide relative to each other on sliding surfaces is known. In such a sealing device, it is necessary to form a fluid lubricating film formed by the sealed fluid between the sliding surfaces to reduce sliding torque and maintain high sealing performance. Furthermore, as a method to achieve high sealing performance and low sliding torque, a technique of arranging multiple dimples on the sliding surfaces is known.

[0003] For example, it is known that arranging the recesses with circular openings on the sliding surface in a virtual circle centered on the rotation center of the sliding component can achieve high sealing performance and low sliding torque. (See, for example, Patent Document 1).

[0004] Furthermore, it is known that when a recess with a semi-circular end and an elongated rectangular opening is configured at a predetermined recess angle θ, and the ratio L1 / L2 of the circumferential length L1 of the recess on the circle passing through the center of the recess to the circumferential length L2 of the platform surface between adjacent recesses on the circle is set to 0.001≤L1 / L2≤0.1, the overall sealing performance and sliding torque of the recess are optimally adjusted (for example, see Patent Document 2).

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2010-133496

[0008] Patent Document 2: Japanese Patent No. 5456772 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] In the technology of Patent Document 1, even if high sealing performance and low slip torque can be achieved under specific operating conditions, high sealing performance and low slip torque cannot be achieved over a wide speed range.

[0011] Furthermore, similarly in the technology of Patent Document 2, since the recess angle is fixed, even if leakage of the sealed fluid and sliding torque can be reduced under specific operating conditions, high sealing performance and low sliding torque cannot be achieved over a wide speed range. In particular, when used in reverse, there is a tendency for decreased sealing performance and increased sliding torque.

[0012] The purpose of this invention is to provide a sliding component that, in a pair of sliding components with sliding surfaces sliding relative to each other, achieves high sealing performance and low sliding torque even when used over a wide range of rotational speeds and regardless of the direction of rotation.

[0013] Solution for solving the problem

[0014] To solve the above-mentioned problems, the sliding component of the present invention is a pair of sliding components whose sliding surfaces slide relative to each other, characterized in that...

[0015] At least one of the sliding surfaces has a set of recesses, wherein the openings of the recesses have orthogonal major and minor axes.

[0016] In the set of recesses, the recesses are configured to form curves with curvatures different from the curvature of the circumference of the sliding surface.

[0017] Based on this feature, in the cavity group, the cavities are configured to form a curve with a curvature different from that of the circumference of the sliding surface, thereby causing the angle of the cavity to gradually change along the curve. Thus, the cavity group is composed of cavities with different suction and dynamic pressure effects, and therefore, as a whole, the cavity group can achieve high sealing performance and low sliding torque over a wide speed range.

[0018] The sliding component of the present invention is characterized in that,

[0019] The set of recesses includes a first set of recesses, which is formed by configuring the recesses to form a curve that convex toward the fluid being sealed.

[0020] Based on this feature, in the first set of recesses, the recesses are configured as curved sections convex toward the fluid being sealed, so the angle of the recesses gradually changes along the curve convex toward the fluid being sealed. Thus, the first set of recesses is composed of recesses with different suction and dynamic pressure effects. Therefore, as a whole, the set of recesses can achieve high sealing performance and low sliding torque over a wide speed range, and can easily be configured into a set of recesses capable of bidirectional rotation.

[0021] The sliding component of the present invention is characterized in that,

[0022] The first set of recesses is disposed on the leakage side of the sliding surface.

[0023] Based on this feature, the first set of recesses is positioned on the leak side, thereby drawing fluid from the leak side and improving the sealing performance.

[0024] The sliding component of the present invention is characterized in that,

[0025] The set of recesses includes a second set of recesses, which is formed by configuring the recesses to form a curve that convexes toward the leakage side.

[0026] Based on this feature, in the second set of recesses, the recesses are configured as curved shapes convex towards the leakage side, and thus the angle of the recesses gradually changes along the curve convex towards the leakage side. Therefore, the second set of recesses is composed of recesses with different suction effects and dynamic pressure effects. Thus, as a whole, the set of recesses can achieve high sealing performance and low sliding torque over a wide speed range, and can easily be configured into a set of recesses capable of bidirectional rotation.

[0027] The sliding component of the present invention is characterized in that,

[0028] The second set of recesses is disposed on the sealed fluid side of the sliding surface.

[0029] Based on this feature, the second set of recesses is positioned on the side of the sealed fluid, thereby drawing in fluid from the sealed fluid side, pressurizing the fluid, and supplying the fluid to the sliding surface. Thus, a fluid film can be formed on the sliding surface to reduce the sliding torque.

[0030] The sliding component of the present invention is characterized in that,

[0031] The set of recesses includes: a first set of recesses configured to form a curve convex toward the sealed fluid; and a second set of recesses configured to form a curve convex toward the leakage side.

[0032] Based on this feature, in the first set of recesses, the recesses are configured as curved shapes convex toward the fluid being sealed, and in the second set of recesses, the recesses are configured as curved shapes convex toward the leakage side. Therefore, the first set of recesses and the second set of recesses can change the angle of the recesses along their respective curves. Thus, as a whole, the recess set can achieve high sealing performance and low sliding torque over a wide speed range, and can easily form a recess set that can rotate in both directions.

[0033] The sliding component of the present invention is characterized in that,

[0034] The first set of recesses is disposed on the leakage side of the sliding surface, and the second set of recesses is disposed on the sealed fluid side of the sliding surface.

[0035] Based on this feature, the first set of recesses disposed on the leakage side can improve the sealing performance, and the second set of recesses disposed on the sealed fluid side can improve the lubricity, thus it can be configured as a sliding component with high sealing and lubricity.

[0036] The sliding component of the present invention is characterized in that,

[0037] The sliding component has a circumferential groove extending circumferentially between the first set of recesses and the second set of recesses.

[0038] Based on this feature, interference between the first and second sets of recesses can be prevented by a circumferential groove that extends circumferentially between them.

[0039] The sliding component of the present invention is characterized in that,

[0040] The sliding surface has multiple regions divided by a platform extending radially, and the set of recesses is disposed in the regions.

[0041] Based on this feature, the fluid flowing within the cavity group is pressurized by being blocked by the platform surface, thus pushing aside the sliding surface to improve lubrication. Attached Figure Description

[0042] Figure 1 This is a longitudinal sectional view showing an example of applying the sliding component of the present invention to a mechanical seal.

[0043] Figure 2 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 1 of the present invention.

[0044] Figure 3 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 2 of the present invention.

[0045] Figure 4 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 3 of the present invention.

[0046] Figure 5 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 4 of the present invention.

[0047] Figure 6 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 5 of the present invention.

[0048] Figure 7 yes Figure 1 The W-W view is a diagram showing an example of the sliding surface of the sliding member according to Embodiment 6 of the present invention.

[0049] Figure 8 It is an example of a closed curve with a minor axis and a major axis. Detailed Implementation

[0050] Hereinafter, with reference to the accompanying drawings, embodiments are exemplarily described to implement the present invention. Unless otherwise explicitly stated, the dimensions, materials, shapes, relative arrangements, etc., of the constituent components described in this embodiment do not imply that the scope of the present invention is limited thereto.

[0051] Example 1

[0052] Reference Figure 1 and Figure 2 The sliding component of Embodiment 1 of the present invention will be described below. In the following embodiments, a mechanical seal is used as an example of a sliding component, but the invention is not limited to this. For example, it can also be used as a sliding component of a bearing that slides with a rotating shaft while sealing lubricating oil to one axial side of a cylindrical sliding surface. It should be noted that the outer peripheral side of the sliding component constituting the mechanical seal is described as the sealed fluid side (high-pressure fluid side), and the inner peripheral side is described as the leakage side (low-pressure fluid side, such as the atmospheric side).

[0053] Figure 1 This is a longitudinal sectional view showing an example of a mechanical seal 1. It is an internal mechanical seal designed to seal the fluid leaking from the outer periphery of the sliding surface S towards the inner periphery. It consists of a rotating side cylinder and a fixed side cylinder. The rotating side cylinder includes: a sleeve 2, fitted into the rotating shaft 10; an annular rotating side sealing ring 3, which is a sliding component on one side; and packing 8, which seals the space between the sleeve 2 and the rotating side sealing ring 3. The rotating side cylinder rotates together with the rotating shaft 10.

[0054] The fixed-side cylinder comprises: a housing 4, which is assembled into a casing 9; an annular fixed-side sealing ring 5, which is a sliding component of the other side; bellows 7, which seals the fixed-side sealing ring 5 and the housing 4; and a helical bellows spring 6, which applies force to the fixed-side sealing ring 5 towards 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.

[0055] In the mechanical seal 1 with the above configuration, the sliding surface S of the rotating side sealing ring 3 and the sliding surface S of the fixed side sealing ring 5 slide against each other to prevent the sealed fluid from flowing out from the outer peripheral side to the inner peripheral side. It should be noted that... Figure 1The illustration shows a case where the width of the sliding surface of the rotating side sealing ring 3 is wider than the width of the sliding surface of the fixed side sealing ring 5, but it is not limited to this case. Of course, the invention can also be applied in the opposite case.

[0056] The materials of the rotating side sealing ring 3 and the fixed side sealing ring 5 are selected from silicon carbide (SiC) which has excellent wear resistance and carbon which has excellent self-lubricating properties. For example, both can be SiC or a combination of rotating side sealing ring 3 being SiC and fixed side sealing ring 5 being carbon.

[0057] like Figure 2 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 2 In this example, there are six regions 11. Each region is provided with a set of recesses 14. The set of recesses 14 is configured as a plurality of recesses 12 arranged together. In addition, the axis CL is a radial axis that divides the region 11 symmetrically from left to right. The platform surface R is the portion of the region 11 that does not have recesses.

[0058] In this invention, a recess 12 refers to a recessed portion having an opening surrounded by a flat sliding surface S and a bottom recessed from the sliding surface S. The opening 12a of the recess 12 is formed by a shape having orthogonal major axis L and minor axis K. Furthermore, the recesses 12 are arranged separately from each other across a platform surface R. In this invention, the major axis L is a virtual line passing through the center G of the shape of the opening 12a and connecting the maximum width portion of the opening 12a. Furthermore, the minor axis K is a virtual line passing through the center G and connecting the openings in a manner orthogonal to the major axis L. Regarding the opening of the recess 12 in this embodiment, an ellipse having orthogonal major axis L and minor axis K is used as an example for explanation. However, it is not limited to an ellipse; any shape having orthogonal major and minor axes can also be oval, rhomboid, polygonal, or similar. Figure 8 The shape shown is formed by arbitrary closed curves 91, 92, 93, and 94.

[0059] like Figure 2As shown, the cavity group 14 is formed with a predetermined number of secondary cavity groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... arranged radially across the platform surface R. Furthermore, the secondary cavity groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... are arranged such that the major axis L of the cavities 12 is neatly aligned to form a virtual curve 13 with a curvature different from the circumference of the sliding surface S. That is, the secondary cavity group is formed with the major axis L of the cavities 12 neatly arranged tangent to the virtual curve 13. The curve 13 is a curve convex towards the sealed fluid and is composed of arcs, parabolas, sine waves, cycloids, etc., with a curvature different from the circumference of the sliding surface S. Furthermore, the secondary recess groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... are configured such that the recess 12 located near the shaft CL is closest to the sealed fluid side, and the recesses 12 located at both ends are closest to the leakage side. Additionally, the recesses 12 located at both ends of the secondary recess groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... can also be configured to be tangent to the leakage side periphery 5a or have an opening at the leakage side periphery 5a. Moreover, the secondary recess groups 14a, 14b, 14c, 14d, 14e, 14f, 14g, ... can also be configured to symmetrically arrange the recesses 12 relative to the shaft CL. Hereinafter, in this invention, the circumference of the sliding surface S represents the trajectory of points equidistant from the center C of the sliding surface S.

[0060] It should be noted that in Embodiment 1, the major axes L of the recesses 12 constituting the sub-recessed group are arranged close to each other and neatly aligned in such a way that the major axes L of the recesses 12 are tangent to the virtual curve 13. However, the major axes L of the recesses 12 can also be arranged at a predetermined angle relative to the virtual curve 13. Furthermore, for illustrative purposes, only in… Figure 2 The surrounding area shows the reference numerals for the secondary recess groups 14a, 14b, 14c, 14d, 14e, 14f, and 14g. The number of secondary recess groups arranged in each region 11 is determined according to design conditions, etc.

[0061] When the rotating side sealing ring 3 of the mechanical seal 1 is configured as follows: Figure 2When rotated counterclockwise as shown, the fluid between the sliding surfaces S and the fluid within the cavity 12 move in the direction of movement of the rotating sealing ring 3 due to their viscosity. For the fluid flowing into the cavity 12, its flow path expands sharply, creating a negative pressure on the upstream side of the cavity 12, resulting in cavitation. However, the magnitude of the negative pressure within the cavitation is limited by the vapor pressure of the fluid, and therefore does not become a large negative pressure. Furthermore, on the downstream side of the cavity 12, the flow path narrows sharply, thereby generating positive pressure through a wedge effect (dynamic pressure effect). Due to the negative pressure generated on the upstream side of the cavity 12, the cavity 12 exerts a suction effect by drawing in the surrounding fluid. On the other hand, the positive pressure generated on the downstream side of the cavity 12 is greater than the negative pressure within the cavitation, and the cavity 12 as a whole forms a positive pressure. Through the positive pressure generated by the multiple cavities 12 disposed on the sliding surfaces S, the sliding surfaces S are pushed apart, and the fluid flows into the sliding surfaces S to achieve a lubrication function.

[0062] When the recesses 12 are arranged from the leakage side periphery 5a of the sliding surface S to the sealing fluid side periphery 5b, the recess assembly 14 can improve the sealing effect by pumping fluid from the leakage side into the sliding surface. Furthermore, by drawing in high-pressure fluid from the sealing fluid side and supplying it to the sliding surface through the dynamic pressure effect of the recesses 12, the fluid lubrication effect can be improved. In particular, when... Figure 2 When the recesses 12 are configured in the form of a curve 13 that bulges toward the fluid being sealed, as in the secondary 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 configured in a concentric circle in the circumferential direction of the sliding surface S.

[0063] Furthermore, the cavity 12 has an elliptical opening 12a with orthogonal major and minor axes. Therefore, the suction and dynamic pressure effects of the cavity 12 vary depending on the inclination of the major axis L. When the major axis is oriented at 0 degrees relative to the sliding direction, the cavity 12's fluid retention capacity is improved. When the major axis is oriented at 45 degrees relative to the sliding direction, the suction effect is improved. Furthermore, when the major axis is oriented at 90 degrees relative to the sliding direction, the dynamic pressure effect is improved. Thus, even for cavities 12 with the same elliptical shape, the suction or dynamic pressure effect can be enhanced by changing the inclination of the major axis L of the cavity 12.

[0064] Furthermore, in the secondary recess groups 14a, 14b, ..., the recesses 12 are configured to form the shape of curve 13, so the angle of the major axis L of each recess 12 gradually changes along curve 13. Thus, since the direction of the major axis L of each recess 12 gradually changes along curve 13, the secondary recess groups 14a, 14b, ... are composed of recesses 12 with different suction and dynamic pressure effects. For the mechanical seal 1, even when used over a wide speed range, the appropriate recesses 12 provide high suction and dynamic pressure effects at each speed, thus, as a whole, the recess group 14 provides high sealing and lubrication performance.

[0065] Furthermore, the secondary recesses 14a, 14b, ... are arranged in a curve 13 that convexes toward the fluid being sealed and are substantially symmetrical with respect to the axis CL, thus providing high sealing and lubrication performance not only during forward rotation but also during reverse rotation.

[0066] As shown above, the sliding component of the present invention achieves the following effects.

[0067] 1. For the cavity 12 constituting the cavity group 14, since a negative pressure is formed on its upstream side, it has the effect of suction of the suction fluid, and since the fluid pressurized by the wedge effect on the downstream side is supplied to the sliding surface, it has the function of lubrication.

[0068] 2. When the recess 12 is arranged from the periphery 5a of the leakage side of the sliding surface S to the periphery 5b of the fluid to be sealed, the recess assembly 14 can exert a pumping effect to draw fluid from the leakage side into the sliding surface, thereby improving the sealing effect. In addition, it can draw high-pressure fluid from the fluid to be sealed and supply the fluid to the sliding surface through the dynamic pressure effect of the recess 12, thereby improving the fluid lubrication effect.

[0069] 3. When Figure 2 When the recesses 12 are configured in the form of a curve 13 that bulges toward the fluid being sealed, as in the secondary 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 configured in a concentric circle in the circumferential direction of the sliding surface S.

[0070] 4. The recess 12 has an elliptical opening 12a, which has orthogonal major and minor axes. Therefore, the intensity of the suction effect and dynamic pressure effect of the recess 12 can be changed by altering the inclination of the major axis L. Thus, even recesses 12 with the same elliptical shape can enhance the suction effect or the dynamic pressure effect by changing the inclination of the major axis L.

[0071] 5. In the secondary recess groups 14a, 14b, ..., the recesses 12 are configured to form the shape of curve 13, so the angle of the major axis L of each recess 12 gradually changes along curve 13. Therefore, since the direction of the major axis L of each recess 12 gradually changes along curve 13, the secondary recess groups 14a, 14b, ... are composed of recesses 12 with different suction and dynamic pressure effects. For the mechanical seal 1, even when used over a wide speed range, the appropriate recesses 12 provide high suction and dynamic pressure effects at each speed, thus the recess group 14 as a whole provides high sealing and lubrication performance.

[0072] 6. The cavity group 14 is arranged to form a curve 13 that convexes towards the sealed fluid and is substantially symmetrical with respect to the axis CL. Therefore, it will have a high suction effect and dynamic pressure effect not only during forward rotation but also during reverse rotation.

[0073] Example 2

[0074] The sliding component of Embodiment 2 of the present invention will be described. Figure 3 The sliding surface S of the sliding member in Embodiment 2 is shown, which differs from Embodiment 1 in that the sub-recesses 24a, 24b, ... are arranged to form a curve 23 convex toward the leakage side. Other configurations are the same as in Embodiment 1. Hereinafter, the same reference numerals will be used to denote components and configurations identical to those in Embodiment 1, and repeated descriptions will be omitted.

[0075] like Figure 3 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 3 In this example, there are six regions 21. Each region is provided with a set of recesses 24. The set of recesses 24 is configured as a plurality of recesses 22 arranged together. In addition, the axis CL is a radial axis that divides the region 21 symmetrically from left to right.

[0076] like Figure 3As shown, the cavity group 24 is formed by arranging a predetermined number of secondary cavity groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... in the radial direction across the platform surface R. The secondary cavity groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... are arranged so that the major axis L of the cavity 22 is neatly aligned to form a virtual curve 23 with a curvature different from the circumference of the sliding surface S. That is, the secondary cavity group forms a shape by neatly arranging the major axis L of the cavity 22 in a manner tangent to the virtual curve 23. The curve 23 is a curve convex towards the leakage side and is composed of arcs, parabolas, sine waves, cycloids, etc., with a curvature different from the circumference of the sliding surface S. Furthermore, the secondary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... are configured such that the recess 22 located near the shaft CL is closest to the leakage side, and the recesses 22 located at both ends are closest to the fluid being sealed. Additionally, the recesses 22 located at both ends of the secondary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... can also be configured to be tangent to the periphery 5b of the fluid being sealed or to have an opening at the periphery 5b of the fluid being sealed. Moreover, the secondary recess groups 24a, 24b, 24c, 24d, 24e, 24f, 24g, ... can also be configured to symmetrically arrange the recesses 22 relative to the shaft CL. It should be noted that, for illustrative purposes only, only... Figure 3 The surrounding area shows the reference numerals for the secondary recess groups 24a, 24b, 24c, 24d, 24e, 24f, and 24g. The number of secondary recess groups arranged in each region 21 is determined according to design conditions, etc.

[0077] When the recesses 22, such as the secondary recess groups 24a, 24b, ..., are arranged close together to form a curve 23, suction and discharge occur continuously and repeatedly between adjacent recesses 22. Therefore, when the recesses 22 are arranged from the leakage side periphery 5a of the sliding surface S to the sealing fluid side periphery 5b, the recess group 24 can exert a pumping effect to draw fluid from the leakage side into the sliding surface, thereby reducing leakage. Furthermore, by drawing in high-pressure fluid from the sealed fluid side and supplying the sliding surface with fluid pressurized by the dynamic pressure effect of the recesses 22, the fluid lubrication effect can be improved. In particular, as... Figure 3 As shown, when the recess 22 is configured to form a curve 23 that bulges toward the leakage side, as in the secondary recess groups 24a, 24b, ..., the fluid lubrication effect of the recess group 24 is stronger than the sealing effect.

[0078] Furthermore, in the secondary recess groups 24a, 24b, ..., the recesses 22 are configured to form a curve 23. Therefore, the angle of the major axis L of each recess 22 gradually changes along the curve 23, and thus the suction effect and dynamic pressure effect of each recess also gradually change along the curve 23. That is, the secondary recess groups 24a, 24b, ... are configured with recesses 22 having different suction and dynamic pressure effects, so even when used over a wide speed range, there are recesses 22 that exhibit high suction and dynamic pressure effects at each speed. Moreover, by arranging the recess group 24, which has multiple secondary recess groups 24a, 24b, ... in the radial direction, in each region 21 of the sliding surface, the recess group 24 as a whole provides lubrication even when used over a wide speed range.

[0079] Furthermore, the secondary recesses 24a, 24b, ... are arranged to form a curve 23 that convexes towards the leakage side and are substantially symmetrical with respect to the shaft CL, thus providing high lubrication performance not only during forward rotation but also during reverse rotation.

[0080] As described above, the sliding component of Embodiment 2 has the following effects.

[0081] 1. For the cavity 22 constituting the cavity group 24, since a negative pressure is formed on its upstream side, it performs the function of sucking in fluid and performs the function of lubrication by discharging fluid that has been pressurized by the wedge effect on the downstream side.

[0082] 2. When the recesses 22 are arranged from the leakage side periphery 5a of the sliding surface S to the sealing fluid side periphery 5b, the recess assembly 24 can reduce leakage by pumping fluid from the leakage side into the sliding surface. Furthermore, by drawing high-pressure fluid from the sealing fluid side and supplying the sliding surface with fluid pressurized by the dynamic pressure effect of the recesses 22, the fluid lubrication effect can be improved.

[0083] 3. When Figure 3 When the recesses 22 are configured in the form of a curve 23 that convexes toward the leakage side, as in the case of the secondary recesses 24a, 24b, ..., the fluid lubrication effect of the recess group 24 can be improved compared to the recess group in which the recesses are configured in a concentric circle in the circumferential direction of the sliding surface S.

[0084] 4. The recess 22 has an elliptical opening 22a, which has orthogonal major and minor axes. Therefore, the intensity of the suction effect and dynamic pressure effect of the recess 22 can be changed by altering the inclination of the major axis L. Thus, even recesses 22 with the same elliptical shape can enhance the suction effect or the dynamic pressure effect by changing the inclination of the major axis L.

[0085] 5. In the sub-cavity groups 24a, 24b, ..., the cavities 22 are configured to form a curve 23. Therefore, the angle of the major axis L of each cavity 22 gradually changes along the curve 23, and thus the suction effect and dynamic pressure effect of each cavity also gradually change along the curve 23. That is, the sub-cavity groups 24a, 24b, ... are configured with cavities 22 having different suction effects and dynamic pressure effects, so even when used over a wide speed range, there will be cavities 22 that exert higher suction effects and dynamic pressure effects at each speed. Furthermore, by arranging the cavity group 24, which has multiple sub-cavity groups 24a, 24b, ... in the radial direction, in each region 21 of the sliding surface, the cavity group 24 as a whole will perform a lubrication function even when used over a wide speed range.

[0086] 6. The secondary recesses 24a, 24b, ... are arranged to form a curve 23 that convex toward the leakage side and are substantially symmetrical with respect to the axis CL, thus providing high lubrication performance not only during forward rotation but also during reverse rotation.

[0087] Example 3

[0088] The sliding component of Embodiment 3 of the present invention will be described. Figure 4 The sliding surface S of the sliding member in Embodiment 3 is shown. It differs from Embodiment 1 in that the recesses 34 are arranged such that the short axes K of adjacent recesses 32 are close to each other and neatly arranged to form a curve 33 convex towards the sealed fluid. Other configurations are the same as in Embodiment 1. Hereinafter, the same reference numerals will be used to denote components and configurations identical to those in Embodiment 1, and repeated descriptions will be omitted.

[0089] like Figure 4 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 4 In this example, there are six regions 31. Each region is provided with a set of recesses 34. The set of recesses 34 is configured as a plurality of recesses 32 arranged together. In addition, the axis CL is a radial axis that divides the region 31 symmetrically from left to right.

[0090] like Figure 4As shown, the cavity group 34 is formed by arranging a predetermined number of secondary cavity groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... in the radial direction across the platform surface R. The secondary cavity groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... are arranged such that the minor axes K of the cavities 32 are neatly aligned to form a virtual curve 33 with a curvature different from the circumference of the sliding surface S. That is, the secondary cavity group is formed by neatly arranging the minor axes K of the cavities 32 in a manner tangent to the virtual curve 33. The curve 33 is a curve convex towards the sealed fluid and is composed of arcs, parabolas, sine waves, cycloids, etc., with curvatures different from the circumference of the sliding surface S. Furthermore, the secondary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... are configured such that the recess 32 located near the shaft CL is closest to the fluid being sealed, and the recesses 32 located at both ends are closest to the leakage side. Additionally, the recesses 32 located at both ends of the secondary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... can also be configured to be tangent to the leakage side periphery 5a or have an opening at the leakage side periphery 5a. Moreover, the secondary recess groups 34a, 34b, 34c, 34d, 34e, 34f, 34g, ... can also be configured to symmetrically arrange the recesses 32 relative to the shaft CL. Here, curve 33 is a virtual curve tangent to the minor axis K of the recess 32. It should be noted that, for illustrative purposes only, only in... Figure 4 The surrounding area shows the reference numerals for the secondary recess groups 34a, 34b, 34c, 34d, 34e, 34f, and 34g. The number of secondary recess groups arranged in each region 31 is determined according to design conditions, etc.

[0091] In embodiment 3, by arranging the long axis L of the recess 32 radially, the dynamic pressure effect of the recess 32 is higher than its sealing effect. Therefore, as a whole, the sliding surface S can improve lubrication and reduce sliding torque.

[0092] Furthermore, when such Figure 4 When the recesses 32 are configured in the form of a curve 33 that bulges toward the fluid being sealed, as in the case of the secondary recesses 34a, 34b, ..., the sealing effect of the recess group 34 can be improved compared to the recess group configured in a concentric circle in the circumferential direction of the sliding surface S.

[0093] Furthermore, in the secondary recess groups 34a, 34b, ..., the recesses 32 are configured to form a curve 33, so the angle of the minor axis K of each recess 32 gradually changes along the curve 33. Consequently, the suction effect and dynamic pressure effect of each recess 32 gradually change along the curve 33. That is, the secondary recess groups 34a, 34b, ... are configured with recesses 32 that exert different suction and dynamic pressure effects, so even when used over a wide speed range, there are recesses 32 that exert higher suction and dynamic pressure effects at each speed. Moreover, by arranging the recess group 34, which has multiple secondary recess groups 34a, 34b, ... in the radial direction, in each region 31 of the sliding surface, even when used over a wide speed range, the recess group 34 as a whole will exhibit high sealing and lubrication performance.

[0094] Furthermore, the secondary recesses 34a, 34b, ... are arranged to form a curve 33 that convexes towards the fluid being sealed and are substantially symmetrical with respect to the axis CL. Therefore, they provide high sealing and lubrication performance not only during forward rotation but also during reverse rotation.

[0095] As shown above, the sliding component of Embodiment 3 not only achieves the effect of Embodiment 1, but also achieves the following effects.

[0096] 1. By arranging the long axis L of the recess 32 radially, the dynamic pressure effect of the recess 32 can be higher than the sealing effect. Therefore, as a whole, the sliding surface S can improve lubrication and reduce sliding torque.

[0097] 2. When Figure 4 When the recesses 32 are configured in the form of a curve 33 that bulges toward the fluid being sealed, as in the case of the secondary recesses 34a, 34b, ..., the sealing effect of the recess group 34 can be improved compared to the recess group configured in a concentric circle in the circumferential direction of the sliding surface S.

[0098] Example 4

[0099] The sliding component of Embodiment 4 of the present invention will be described. Figure 5 The sliding surface S of the sliding member in Embodiment 4 is shown. It differs from Embodiment 1 in that the recesses 44 are arranged such that the short axes K of adjacent recesses 42 are close to each other and neatly arranged to form a curve 43 convex towards the leakage side. Other configurations are the same as in Embodiment 1. Hereinafter, the same reference numerals will be used to denote components and configurations identical to those in Embodiment 1, and repeated descriptions will be omitted.

[0100] like Figure 5 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 5In this example, there are six regions 41. Each region is provided with a set of recesses 44. The set of recesses 44 is configured as a plurality of recesses 42 arranged together. In addition, the axis CL is a radial axis that divides the region 41 symmetrically from left to right.

[0101] like Figure 5 As shown, the cavity group 44 is formed by arranging a predetermined number of secondary cavity groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... in the radial direction across the platform surface R. The secondary cavity groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... are arranged so that the minor axes K of the cavities 42 are neatly aligned to form a virtual curve 43 with a curvature different from that of the circumference of the sliding surface S. That is, the secondary cavity group is formed by arranging the minor axes K of the cavities 42 neatly in a manner tangent to the virtual curve 43. The curve 43 is a curve convex towards the leakage side and is composed of arcs, parabolas, sine waves, cycloids, etc., with curvatures different from that of the circumference of the sliding surface S. Furthermore, the secondary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... are configured such that the recess 42 located near the shaft CL is closest to the leakage side, and the recesses 42 located at both ends are closest to the fluid being sealed. Additionally, the recesses 42 located at both ends of the secondary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... can also be configured to be tangent to the periphery 5b of the fluid being sealed or to have an opening at the periphery 5b of the fluid being sealed. Moreover, the secondary recess groups 44a, 44b, 44c, 44d, 44e, 44f, 44g, ... can also be configured to symmetrically arrange the recesses 42 relative to the shaft CL. It should be noted that, for illustrative purposes only, only... Figure 5 The surrounding area shows the reference numerals for the secondary recess groups 44a, 44b, 44c, 44d, 44e, 44f, and 44g. The number of secondary recess groups arranged in each region 41 is determined according to design conditions, etc.

[0102] By arranging the long axis L of the recess 42 radially, the hydrodynamic effect of the recess 42 is higher than its sealing effect. Therefore, as a whole, the sliding surface S can improve lubrication and reduce sliding torque.

[0103] When Figure 5 When the recess 42 is configured in the shape of a curve 43 convex toward the leakage side, as in the secondary recess groups 44a, 44b, ..., the fluid lubrication effect of the recess group 44 can be improved compared with the recess group in which the recesses are configured in a concentric circle in the circumferential direction of the sliding surface S.

[0104] Furthermore, in the secondary recess groups 44a, 44b, ..., the recesses 42 are configured to form a shape that creates a curve 43, so the angle of the major axis L of each recess 42 gradually changes along the curve 43. Consequently, the suction effect and dynamic pressure effect of each recess 42 gradually change along the curve 43. That is, the secondary recess groups 44a, 44b, ... are configured with recesses 42 that exhibit different suction and dynamic pressure effects, so even when used over a wide speed range, there are recesses 42 that exhibit high suction and dynamic pressure effects at each speed. Moreover, by arranging a recess group 44, in which multiple secondary recess groups 44a, 44b, ... are arranged radially in each region 41 of the sliding surface, even when used over a wide speed range, the recess group 44 as a whole exhibits high sealing and lubrication performance.

[0105] Furthermore, the secondary recesses 44a, 44b, ... are arranged to form a curve 43 that convexes towards the leakage side and are substantially symmetrical with respect to the shaft CL. Therefore, they can provide high sealing and lubrication functions not only during forward rotation but also during reverse rotation.

[0106] As described above, the sliding component of Embodiment 4 not only achieves the effect of Embodiment 2, but also achieves the following effects.

[0107] 1. By arranging the long axis L of the recess 42 radially, the dynamic pressure effect of the recess 42 is higher than its sealing effect. Therefore, as a whole, the sliding surface S improves lubrication and reduces sliding torque.

[0108] 2. When Figure 5 When the recess 42 is configured in the form of a curve 43 that convexes toward the leakage side, as in the case of the secondary 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 configured in a concentric circle in the circumferential direction of the sliding surface S.

[0109] Example 5

[0110] The sliding component of Embodiment 5 of the present invention will be described. Figure 6 The sliding surface S of the sliding member in Embodiment 5 is shown, which differs from Embodiment 1 in that it has a set of recesses 54 arranged on the leaking side in a manner forming a curve 53 convex toward the sealed fluid side and a set of recesses 59 arranged on the sealed fluid side in a manner forming a curve 58 convex toward the leaking side. Other configurations are the same as in Embodiment 1. Hereinafter, the same reference numerals will be used to denote the same components and configurations as in Embodiment 1, and repeated descriptions will be omitted.

[0111] like Figure 6 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 6In this example, there are six regions 51. Each region is provided with recess groups 54 and 59. Recess group 54 is composed of multiple recesses 52 arranged in a row, and recess group 59 is composed of multiple recesses 57 arranged in a row. In addition, axis CL is a radial axis that divides region 51 symmetrically from left to right.

[0112] A set of recesses 54 is provided on the leakage side of the sliding surface S. The set of recesses 54 is formed by a predetermined number of secondary recesses 54a, 54b, 54c, 54d, ... arranged radially across the platform surface R. Furthermore, the secondary recesses 54a, 54b, 54c, 54d, ... are arranged such that the major axes L of the recesses 52 are neatly aligned to form a virtual curve 53 with a curvature different from the circumference of the sliding surface S. That is, the secondary recesses are formed in a shape where the major axes L of the recesses 52 are neatly arranged tangent to the virtual curve 53. The curve 53 is a curve convex towards the sealed fluid side, and is composed of arcs, parabolas, sine waves, cycloids, etc., with curvature different from the circumference of the sliding surface S. Furthermore, the secondary recess groups 54a, 54b, 54c, 54d, ... are configured such that the recess 52 located near the shaft CL is closest to the fluid being sealed, and the recesses 52 located at both ends away from the shaft CL are closest to the leakage side. Additionally, the recesses 52 located at both ends of the secondary recess groups 54a, 54b, 54c, 54d, ... can also be configured to be tangent to the leakage side periphery 5a or have an opening at the leakage side periphery 5a. Moreover, the secondary recess groups 54a, 54b, 54c, 54d, ... can also be configured to symmetrically arrange the recesses 52 relative to the shaft CL. It should be noted that, for illustrative purposes only, only... Figure 6 The surrounding area shows the reference numerals for the secondary recesses 54a, 54b, 54c, and 54d. The number of secondary recesses arranged in each region 51 is determined according to design conditions, etc.

[0113] A set of recesses 59 is provided on the fluid-sealed side of the sliding surface S. The set of recesses 59 is formed by a predetermined number of secondary recesses 59a, 59b, 59c, ... arranged radially across the platform surface R. The secondary recesses 59a, 59b, 59c, ... are arranged such that the major axes L of the recesses 57 are neatly aligned to form a virtual curve 58 with a curvature different from the circumference of the sliding surface S. That is, the secondary recesses are formed by neatly arranging the major axes L of the recesses 57 tangent to the virtual curve 58. The curve 58 is a convex curve towards the leakage side, and is composed of arcs, parabolas, sine waves, cycloids, etc., with curvatures different from the circumference of the sliding surface S. Furthermore, the secondary recesses 59a, 59b, 59c, ... are arranged such that the recesses 57 located near the axis CL are closest to the leakage side, and the recesses 57 located at both ends are closest to the fluid-sealed side. Furthermore, the recesses 57 at both ends of the secondary recess groups 59a, 59b, 59c, ... can also be configured to be tangent to the periphery 5b of the fluid being sealed or to have an opening on the periphery 5b of the fluid being sealed. Moreover, the secondary recess groups 59a, 59b, 59c, ... can also be configured to symmetrically arrange the recesses 57 relative to the axis CL. It should be noted that, for illustrative purposes only, only in... Figure 6 The surrounding portion shows the reference numerals for the secondary recesses 59a, 59b, and 59c.

[0114] Compared to concentrically arranged recesses on the circumference of the sliding surface S, the recess group 54, located on the leakage side of the sliding surface S and arranged in a curve 53 convex towards the sealed fluid side, provides superior sealing performance. Furthermore, compared to concentrically arranged recesses on the circumference of the sliding surface S, the recess group 59, located on the sealed fluid side of the sliding surface S and arranged in a curve 58 convex towards the leakage side of the sliding surface S, provides superior lubrication. By configuring the recess group 54, which offers excellent sealing performance, and the recess group 59, which offers excellent lubrication performance, on the sliding surface S, the mechanical seal 1 achieves excellent sealing and lubrication properties.

[0115] The recesses 54 are arranged in a curve 53 that convexes towards the fluid being sealed and are substantially symmetrical with respect to the shaft CL, thus providing high sealing performance not only during forward rotation but also during reverse rotation. Furthermore, the recesses 59 are arranged in a curve 58 that convexes towards the leakage side and are substantially symmetrical with respect to the shaft CL, thus providing lubrication not only during forward rotation but also during reverse rotation, thereby achieving high sealing and lubrication performance regardless of the direction of rotation.

[0116] As described above, the sliding component of Embodiment 5 not only achieves the effects of Embodiments 1 and 2, but also achieves the following effects.

[0117] 1. Compared to concentrically arranged recesses in the circumferential direction of the sliding surface S, a recess group 54 located on the leakage side of the sliding surface S and arranged in a curve 53 convex towards the sealed fluid side exhibits higher sealing performance. Furthermore, compared to concentrically arranged recesses in the circumferential direction of the sliding surface S, a recess group 59 located on the sealed fluid side of the sliding surface S and arranged in a curve 58 convex towards the leakage side of the sliding surface S exhibits higher lubrication performance.

[0118] 2. The cavity group 54 is arranged in a substantially symmetrical manner with respect to the shaft CL. In addition, the cavity group 59 is arranged in a substantially symmetrical manner with respect to the shaft CL. Therefore, it can perform high sealing and lubrication performance regardless of the direction of rotation.

[0119] Example 6

[0120] The sliding component of Embodiment 6 of the present invention will be described. Figure 7 The sliding surface S of the sliding member in Embodiment 6 is shown, which differs from Embodiment 5 in that it has a groove between the set of recesses 64 arranged on the leaking side in a manner forming a curve 63 convex toward the sealed fluid side and the set of recesses 69 arranged on the sealed fluid side in a manner forming a curve 68 convex toward the leaking side. Other configurations are the same as in Embodiment 5. Hereinafter, the same reference numerals will be used to denote the same components and configurations as in Embodiment 5, and repeated descriptions will be omitted.

[0121] like Figure 7 As shown, the sliding surface S of the fixed-side sealing ring 5 is divided into a predetermined number of sections R, extending from the sealed fluid side to the leakage side. Figure 7 In this example, there are six regions 61. Each region is provided with recess groups 64 and 69. Recess group 64 is composed of multiple recesses 62 arranged in a row, and recess group 69 is composed of multiple recesses 67 arranged in a row. In addition, axis CL is a radial axis that divides region 61 symmetrically from left to right.

[0122] On the leakage side of the sliding surface S, similar to Embodiment 5, a group of recesses 64 is provided, arranged to form a curve 63 convex toward the fluid being sealed. The group of recesses 64 is formed by a predetermined number of secondary recesses 64a, 64b, 64c, 64d, ... arranged radially across the platform surface R. The secondary recesses 64a, 64b, 64c, 64d, ... are arranged such that the major axis L of the recesses 62 is neatly aligned to form a virtual curve 63 with a curvature different from the circumference of the sliding surface S. The curve 63 is a curve convex toward the fluid being sealed, and is composed of arcs, parabolas, sine waves, cycloids, etc., with a curvature different from the circumference of the sliding surface S. Furthermore, the secondary recesses 64a, 64b, 64c, 64d, ... are arranged such that the recesses 62 located near the axis CL are closest to the fluid being sealed, and the recesses 62 located at both ends are closest to the leakage side. Furthermore, the recesses 62 at both ends of the secondary recess groups 64a, 64b, 64c, 64d, ... can also be configured to be tangent to the leakage side periphery 5a or to have openings on the leakage side periphery 5a. Moreover, the secondary recess groups 64a, 64b, 64c, 64d, ... can also be configured to symmetrically arrange the recesses 62 relative to the axis CL. It should be noted that, for illustrative purposes only, only in... Figure 7 The surrounding area shows the reference numerals for the secondary recesses 64a, 64b, 64c, and 64d. The number of secondary recesses arranged in each region 61 is determined according to design conditions, etc.

[0123] On the sealed fluid side of the sliding surface S, similar to Embodiment 5, a group of recesses 69 are arranged to form a curve 68 convex toward the leakage side. The recess group 69 is formed by a predetermined number of secondary recesses 69a, 69b, 69c, ... arranged radially across the platform surface R. The secondary recesses 69a, 69b, 69c, ... are arranged so that the major axes L of the recesses 67 are neatly aligned to form a virtual curve 68 with a curvature different from the circumference of the sliding surface S. The curve 68 is a convex curve toward the leakage side, and is composed of arcs, parabolas, sine waves, cycloids, etc., with curvatures different from the circumference of the sliding surface S. Furthermore, the secondary recesses 69a, 69b, 69c, ... are arranged such that the recesses 67 located near the axis CL are closest to the leakage side, and the recesses 67 located at both ends are closest to the sealed fluid side. Furthermore, the recesses 67 at both ends of the secondary recess groups 69a, 69b, 69c, ... can also be configured to be tangent to the periphery 5b of the fluid being sealed or to have an opening on the periphery 5b of the fluid being sealed. Moreover, the secondary recess groups 69a, 69b, 69c, ... can also be configured to symmetrically arrange the recesses 67 relative to the axis CL. It should be noted that, for illustrative purposes only, only in... Figure 7 The surrounding portion shows the reference numerals for the secondary recesses 69a, 69b, and 69c.

[0124] A groove 65 is provided between the cavity group 64 and the cavity group 69. The groove 65 is formed to be sufficiently deeper than the depth of the cavity 62 constituting the cavity group 64 and the cavity 67 constituting the cavity group 69, and sufficiently larger than the size of the opening of the cavity 62 and the cavity 67.

[0125] A set of recesses 64, located on the leakage side of the sliding surface S and arranged to form a curve 63 convex towards the fluid being sealed, draws in fluid from the leakage side, thus achieving high sealing performance. Furthermore, a set of recesses 69, located on the fluid being sealed side of the sliding surface S and arranged to form a curve 68 convex towards the leakage side of the sliding surface S, draws in fluid from the fluid being sealed and discharges pressurized fluid from within the recesses 67 into the sliding surface S, thus maintaining the sliding surface S in a fluid-lubricated state. By configuring the sliding surface S with the excellent sealing performance of the recesses 64 and the excellent lubrication performance of the recesses 69, the mechanical seal 1 achieves excellent sealing and lubrication performance.

[0126] Furthermore, a groove 65 is provided between the recess group 64 and the recess group 69, thereby preventing interference between the recess group 64 and the recess group 69. This prevents the functions of the recess group 64 (which provides sealing) and the recess group 69 (which provides lubrication) from canceling each other out in the area where the recess group 64 and the recess group 69 are close together.

[0127] The recesses 64 are arranged to form a curve 63 that convexes toward the fluid being sealed and are substantially symmetrical with respect to the shaft CL. Therefore, they can provide high sealing performance not only during forward rotation but also during reverse rotation. The recesses 69 are arranged to form a curve 68 that convexes toward the leakage side and are substantially symmetrical with respect to the shaft CL. Therefore, they can provide lubrication not only during forward rotation but also during reverse rotation. Thus, they can provide high sealing and lubrication performance regardless of the direction of rotation.

[0128] As described above, the sliding component of Embodiment 6 not only achieves the effect of Embodiment 5, but also achieves the following effects.

[0129] The mechanical seal of Embodiment 6 also has a groove 65 between the recess group 64 and the recess group 69, thus preventing interference between the recess group 64 and the recess group 69. Therefore, in the area where the recess group 64 and the recess group 69 are close together, the functions of the recess group 64 (which provides sealing) and the recess group 69 (which provides lubrication) are prevented from canceling each other out.

[0130] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the specific configuration is not limited to these embodiments. Any changes or additions that do not depart from the spirit of the present invention are also included in the present invention.

[0131] 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 it is not limited to this. It can also be applied when the inner peripheral side is the sealed fluid side and the outer peripheral side is the leakage side.

[0132] Explanation of reference numerals in the attached figures

[0133] 1: Mechanical seals;

[0134] 2: Sleeve;

[0135] 3: Rotary side sealing ring;

[0136] 4: Casing;

[0137] 5: Fixed side sealing ring;

[0138] 6: Helical corrugated spring;

[0139] 7: Corrugated pipe;

[0140] 8: Seals;

[0141] 9: Box;

[0142] 10: Rotation axis;

[0143] 11: Region;

[0144] 12: Depression;

[0145] 14: Depression group;

[0146] 14a: Auxiliary depression group;

[0147] 14b: Auxiliary depression group;

[0148] 14c: Acupoint group with secondary depressions;

[0149] 14d: Acupoint group;

[0150] 14e: Auxiliary depression group;

[0151] 14f: Auxiliary depression group;

[0152] 14g: Acupoint group (posterior depression);

[0153] 21: Region;

[0154] 22: Depression;

[0155] 24: Depression group;

[0156] 24a: Auxiliary depression group;

[0157] 24b: Auxiliary depression group;

[0158] 24c: Acupoint group with secondary depressions;

[0159] 24d: Acupoint group;

[0160] 24e: Auxiliary depression group;

[0161] 24f: Auxiliary depression group;

[0162] 31: Region;

[0163] 32: Depression;

[0164] 34: Depression group;

[0165] 34a: Auxiliary depression group;

[0166] 34b: Auxiliary depression group;

[0167] 34c: Acupoint group with secondary depressions;

[0168] 34d: Acupoint group;

[0169] 34e: Acupoint group with secondary depressions;

[0170] 34f: Auxiliary depression group;

[0171] 34g: Acupoint group (posterior depression);

[0172] 41: Region;

[0173] 42: Depression;

[0174] 44: Depression group;

[0175] 44a: Auxiliary depression group;

[0176] 44b: Auxiliary depression group;

[0177] 44c: Acupoint group with secondary depressions;

[0178] 44d: Acupoint group;

[0179] 44e: Auxiliary depression group;

[0180] 44f: Auxiliary depression group;

[0181] 44g: Acupoint group (posterior depression);

[0182] 51: Region;

[0183] 52: Depression;

[0184] 54: Depression group;

[0185] 54a: Auxiliary depression group;

[0186] 54b: Auxiliary depression group;

[0187] 54c: Acupoint group with secondary depressions;

[0188] 54d: Acupoint group;

[0189] 57: Depression;

[0190] 59: Depression group;

[0191] 59a: Auxiliary depression group;

[0192] 59b: Auxiliary depression group;

[0193] 59c: Acupoint group with secondary depressions;

[0194] 61: Region;

[0195] 62: Depression;

[0196] 64: Depression group;

[0197] 64a: Auxiliary depression group;

[0198] 64b: Auxiliary depression group;

[0199] 64c: Acupoint group with secondary depressions;

[0200] 64d: Acupoint group;

[0201] 65: Groove section;

[0202] 67: Depression;

[0203] 69: Depression group;

[0204] 69a: Auxiliary depression group;

[0205] 69b: Auxiliary depression group;

[0206] 69c: Acupoint group with secondary depressions;

[0207] K: Short axis;

[0208] L: Major axis;

[0209] R: Platform surface;

[0210] S: Sliding surface.

Claims

1. A sliding component, comprising a pair of sliding components that slide relative to each other on a sliding surface, characterized in that, At least one of the sliding surfaces has a plurality of recess groups (54, 59) formed by a plurality of recesses (57), wherein the opening of each recess (57) has an orthogonal major axis and a minor axis, and adjacent recess groups (54, 59) in the circumferential direction of the sliding surface are separated by a platform surface (R). Each of the plurality of recesses in the plurality of recess groups is configured to form a curve having a curvature different from that of the circumference of the sliding surface, the curve being formed by aligning the major or minor axes of the plurality of recesses in the recess group. The recess extends from the periphery of the leaking side of the sliding surface to the periphery of the sealed fluid side. The plurality of recess groups (54, 59) include a first recess group (54) and a second recess group (59), wherein the first recess group (54) is configured to form a curve convex toward the sealed fluid, and the second recess group (59) is configured to form a curve convex toward the leakage side.

2. The sliding component according to claim 1, characterized in that, The first set of recesses (54) is disposed on the leakage side of the sliding surface, and the second set of recesses (59) is disposed on the sealed fluid side of the sliding surface.

3. The sliding component according to claim 1 or 2, characterized in that, It has a circumferential groove extending circumferentially between the first set of recesses and the second set of recesses.

4. The sliding component according to claim 1 or 2, characterized in that, The sliding surface has multiple regions divided by a platform extending radially, and the set of recesses is disposed in the regions.

5. The sliding component according to claim 1 or 2, characterized in that, The opening of the cavity is elliptical.

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