Sliding element
AssigneeEagle Industry Co., Ltd.
InventorYoshihiro Tejima
Life of this patent
Estimating the term…
Abstract
A primary objective of the present invention is to decrease the friction coefficient of the sliding face of a sliding element and to improve its seal performance. The sliding element disposes a plurality of elongate dimples in its first sliding face in which forward edges of the dimples relative to a rotational direction are inclined with respect to a tangential direction of a rotational circumference. The sliding element also disposes a second sliding face which has either a plane surface or second dimples and is located in the opposite side of the first sliding face relative to the process fluid.
Claims10
A sliding element for providing a seal against a process fluid being located in either inner circumference or outer circumference of sliding faces of a pair of relatively slidable sliding components, one of said components being a stationary sliding element and the other of said components being a rotary sliding element, said sliding element comprising:
- a) a first sliding face of said sliding faces being located in said process fluid side;
- b) dimples being disposed on said first sliding face, said dimples being oriented with an inclined angle relative to a tangential direction of a rotational circumference, a longitudinal direction of said dimples being aligned with said inclined angle;
- and
- c) a second sliding face of said sliding faces being located in the opposite side relative to said process fluid, said second sliding face either having a plane surface or retaining second dimples, said second dimples being smaller than said dimples.
A sliding element for providing a seal against a process fluid being located in either inner circumference or outer circumference of sliding faces of a pair of relatively slidable sliding components, one of said components being a stationary sliding element and the other of said components being a rotary sliding element, said sliding element comprising:
- a) a first sliding face of said sliding faces being located in said process fluid side;
- b) a plurality of dimples being disposed on said first sliding face, said dimples having either an elliptic form or a rectangular form and consisting of at least one kind of form, said dimples being inclined such that a forward edge of said dimple relative to a tangential direction of a rotational circumference is adjacent to a circumferential edge, said circumferential edge being located toward said process fluid, maximum width of said dimple being in a range of from 100×10−6 m to 1000×10−6 m, longitudinal length of said dimple being in a range of more than 500×10−6 m and larger than the width of said dimple and smaller than the radial width of said first sliding face, depth of said dimple being in a range of from 1×10−6 m to 25×10−6 m;
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- c) a second sliding face of said sliding faces being located in the opposite side relative to said process fluid, said second sliding face either having a plane surface or retaining second dimples, said second dimples being smaller than said dimples.
A sliding element for providing a seal against a process fluid being located in either inner circumference or outer circumference of sliding faces of a pair of relatively slidable sliding components, one of said components being a stationary sliding element and the other of said components being a rotary sliding element, said sliding element comprising:
- a) a first sliding face being located in one of said sliding faces;
- b) a plurality of dimples being disposed on said first sliding face, said dimples having either an elliptic form or a rectangular form and consisting of at least one kind of form, said dimples being inclined such that a forward edge of said dimple relative to a tangential direction of a rotational circumference is located adjacently to a circumferential edge, said circumferential edge being adjacent to said process fluid, maximum width of said dimple being in a range of from 100×10−6 m to 1000×10−6 m, longitudinal length of said dimple being in a range of more than 500×10−6 m and larger than the width of said dimple and smaller than the radial width of said first sliding face, depth of said dimple being in a range of from 1×10−6 m to 25×10−6 m;
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- c) second sliding faces of said sliding faces being located in the both sides with respect to said first sliding face, said second sliding face either having a plane surface or retaining second dimples, said second dimples being smaller than said dimples.
7 The sliding element as in claim 3 wherein form of said second dimple is a circle, square, rhomboid, or a rectangle or an ellipsoid which is aligned with a diametric or axial direction.
8 The sliding element as in claim 1 wherein a ratio of the radial width of a first sliding face disposing said dimples over the radial width of said sliding face is in a range of from 0.25 to 0.75.
9 The sliding element as in claim 2 wherein a ratio of the radial width of a first sliding face disposing said dimples over the radial width of said sliding face is in a range of from 0.25 to 0.75.
10 The sliding element as in claim 3 wherein a ratio of the radial width of a first sliding face disposing said dimples over the radial width of said sliding face is in a range of from 0.25 to 0.75.
Dependencies are inferred from the claim text.