Sliding component

A sliding structure comprising:

• a pair of sliding parts sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,
• wherein the sliding face of at least one of the sliding parts is provided with:
• a first fluid-side negative pressure generation mechanism,
• a second fluid-side negative pressure generation mechanism located on the second-fluid side of the first fluid-side negative pressure generation mechanism,
• a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on the first-fluid side of the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism,
• a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other,
• a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other,
• a first annular circumferential groove provided in and running annularly through the first land part, and
• a second annular circumferential groove provided in and running annularly through the second land part,
• wherein:
• the first fluid-side negative pressure generation mechanism is formed by a first spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side communicates with the second annular circumferential groove, and an end of each groove on the second-fluid side is isolated from the first annular circumferential groove by the first land part,
• the second fluid-side negative pressure generation mechanism is formed by a second spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the first annular circumferential groove by the first land part, and an end of each groove on the second-fluid side communicates with the second-fluid side, and
• the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.

A sliding structure comprising:

• a pair of sliding parts sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,
• wherein the sliding face of at least one of the sliding parts is provided with:
• a first fluid-side negative pressure generation mechanism,
• a second fluid-side negative pressure generation mechanism located on the second-fluid side of the first fluid-side negative pressure generation mechanism,
• a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on the first-fluid side of the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism,
• a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other,
• a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other,
• a first annular circumferential groove provided in and running annularly through the first land part, and
• a second annular circumferential groove provided in and running annularly through the second land part,
• wherein:
• the first fluid-side negative pressure generation mechanism is formed by a first spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the second annular circumferential groove by the second land part, and an end of each groove on the second-fluid side is isolated from the first annular circumferential groove by the first land part,
• the second fluid-side negative pressure generation mechanism is formed by a second spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the first annular circumferential groove by the first land part, and an end of each groove on the second-fluid side communicates with the second-fluid side, and
• the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.

A sliding structure comprising:

• a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,
• wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove which has a dead end on an uppermost stream side of the first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove which has a dead end on an uppermost stream side of the second negative pressure generation groove and is located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided with a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,
• a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other, a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly through the first land part, and a second annular circumferential groove provided in and running annularly through the second land part, wherein
• the first negative pressure generation groove is isolated from the second fluid side by the first land part, and the second negative pressure generation groove is isolated from the first-fluid side by the second land part, and wherein
• a downstream side end of each groove on the first- fluid side communicates with the second annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.

A sliding structure comprising:

• a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,
• wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove which is located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided with a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,
• a land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly, and a second annular circumferential groove provided in and running annularly through the land part, wherein
• the first negative pressure generation groove and the second negative pressure generation groove are isolated from the first-fluid side by the land part, and wherein
• an upstream side end of each groove on the first- fluid side communicates with the first annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.

A sliding structure comprising:

• a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,
• wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove which has a dead end on an uppermost stream side of the first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided witha dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,
• the second negative pressure generation groove has an uppermost stream end communicating with the annular circumferential groove,
• a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other, a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly through the first land part, and a second annular circumferential groove provided in and running annularly through the second land part,
• the first negative pressure generation groove is isolated from the second fluid side by the first land part, and the second negative pressure generation groove is isolated from the first-fluid side by the first land part, and wherein
• a downstream side end of each groove on the first-fluid side communicates with the second annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.