Sliding component

A sliding component comprising a pair of sliding rings having sliding surfaces rotatable relative to each other to partition a sealed fluid space and a leakage space,

• wherein at least one of the sliding surfaces is provided with a plurality of forward dynamic pressure generation grooves each of which is configured to communicate with the leakage space, a forward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a first land portion and is configured to communicate with the sealed fluid space, and a backward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a second land portion and communicates with the sealed fluid space, and
• wherein the forward dynamic pressure generation grooves are disposed in a sparser state with respect to the backward fluid inlet/outlet groove than with respect to the forward fluid inlet/outlet groove, and
• wherein the sparser state is configured such that the forward dynamic pressure generation grooves are disposed to be directed to only the forward fluid inlet/outlet groove.

A sliding component comprising a pair of sliding rings having sliding surfaces rotatable relative to each other to partition a sealed fluid space and a leakage space,

• wherein at least one of the sliding surfaces is provided with a plurality of forward dynamic pressure generation grooves each of which is configured to communicate with the leakage space, a forward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a first land portion and is configured to communicate with the sealed fluid space, and a backward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a second land portion and communicates with the sealed fluid space, and
• wherein the forward dynamic pressure generation grooves are disposed in a sparser state with respect to the backward fluid inlet/outlet groove than with respect to the forward fluid inlet/outlet groove, and
• wherein the sparser state is configured such that part of the forward dynamic pressure generation grooves close to the backward fluid inlet/outlet groove have a larger arrangement period than part of the forward dynamic pressure generation grooves close to the forward fluid inlet/outlet groove.

A sliding component comprising a pair of sliding rings having sliding surfaces rotatable relative to each other to partition a sealed fluid space and a leakage space,

• wherein at least one of the sliding surfaces is provided with a plurality of forward dynamic pressure generation grooves each of which is configured to communicate with the leakage space, a forward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a first land portion and is configured to communicate with the sealed fluid space, and a backward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a second land portion and communicates with the sealed fluid space, and
• wherein the forward dynamic pressure generation grooves are disposed in a sparser state with respect to the backward fluid inlet/outlet groove than with respect to the forward fluid inlet/outlet groove, and
• wherein the sparser state is configured such that land portions each disposed between adjacent two of part of the forward dynamic pressure generation grooves close to the backward fluid inlet/outlet groove have larger circumferential widths than land portions each disposed between adjacent two of part of the forward dynamic pressure generation grooves close to the forward fluid inlet/outlet groove.

A sliding component comprising a pair of sliding rings having sliding surfaces rotatable relative to each other to partition a sealed fluid space and a leakage space,

• wherein at least one of the sliding surfaces is provided with a plurality of forward dynamic pressure generation grooves each of which is configured to communicate with the leakage space, a forward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a first land portion and is configured to communicate with the sealed fluid space, and a backward fluid inlet/outlet groove which is separated from the forward dynamic pressure generation grooves by a second land portion and communicates with the sealed fluid space, and
• wherein the forward dynamic pressure generation grooves are disposed in a sparser state with respect to the backward fluid inlet/outlet groove than with respect to the forward fluid inlet/outlet groove, and
• wherein the sparser state is configured such that part of the forward dynamic pressure generation grooves close to the backward fluid inlet/outlet groove have smaller depths than part of the forward dynamic pressure generation grooves close to the forward fluid inlet/outlet groove.