Sliding element
A primary objective of a sliding element of the present invention is to decrease a friction coefficient of the sliding face and to improve seal performance thereof. The sliding element comprises a first dam section ( 6 ) which is configured in an annular form on the sliding face ( 2 ), a second dimple section ( 3 A) which has a form of a narrow groove and makes an inclination angle (β) being measured from the dam section ( 6 ) in a direction of rotation pointing toward the sealed fluid, a suction means ( 3 ) which includes an annularly arranged array of the second dimple sections ( 3 A), a first dimple section ( 4 A) which has a form of a narrow groove and makes an inclination angle (α) being measured from the dam section ( 6 ) in a direction of rotation pointing an opposite direction relative to the suction means ( 3 ), a discharge means ( 4 ) which includes an annularly arranged array of the first dimple sections ( 4 A), and a seal face ( 7 ) which is disposed in a peripheral surface adjacent to the discharge means ( 4 ) and in the opposite side relative to the dam section ( 6 ).
1. A sliding element that keeps a sealed fluid on a sliding face of said sliding element, said sliding element being slidable relative to another sliding element, said sealed fluid being located in either inner circumferential side or outer circumferential side of said sliding face, said sliding element comprising:
a) a first dam section being configured in an annular form on said sliding face;
b) a second dimple section having a form of a narrow second groove and making an inclination angle (β) measured from said dam section in a direction of rotation pointing toward said sealed fluid;
c) suction means including an annularly arranged array of said second dimple sections;
d) a first dimple section having a form of a narrow first groove and making an inclination angle (α) measured from said first dam section in a direction of rotation but pointing an opposite direction relative to said suction means;
e) discharge means including an annularly arranged array of said first dimple sections; and
f) seal face being disposed in a peripheral surface adjacent to said discharge means and in the opposite side relative to said dam section,
wherein said first dimple section is located at a low pressure side, said second dimple section is located at a high pressure side,
wherein a longitudinal length of said first groove of said first dimple section is greater than a longitudinal length of said second groove of said second dimple section, and
wherein a second dam section in an annular form circumferentially traverses said second dimple section, and
wherein a third dam section in an annular form circumferentially traverses an intermediate portion of said first dimple section.
2. The sliding element as in claim 1 wherein the inclination angle α of the first dimple section is arranged no more than the inclination angle (β) of the second dimple section.
3. The sliding element as in claim 1 wherein the groove width of said first dimple section and said second dimple section gradually increases from the radially inboard side to the radially outboard side.
4. The sliding element as in claim 1 wherein the inclination angle (α) of said first dimple section is in the range of from 15 to 55 degrees and the inclination angle (β) of said second dimple section is in the range of from 15 to 55 degrees.
5. The sliding element as in claim 3 wherein the inclination angle (α) of said first dimple section is in the range of from 15 to 55 degrees and the inclination angle (β) of said second dimple section is in the range of from 15 to 55 degrees.
6. The sliding element as in claim 1 wherein a tip portion at radially fluid side of said second dimple section protrudes toward the same fluid side beyond the periphery of an opposed mating sliding face of a mating sliding element.