Sliding member and manufacturing method therefor
A thrust bearing is equipped with a resin coating applied to the surface of a base material. Lattice-shaped discharge grooves are formed in the surface of the thrust bearing, and planer protrusions having a square shape or the like are formed at the adjacent positions thereof. Each corner part of each planer protrusion form a sliding surface that slides with respect to a counterpart member. Contaminants such as wear particles that have infiltrated between the counterpart member and the sliding surface fail into the discharge grooves and then are discharged outside of the sliding surface. The chamfering of each corner part to a rounded shape prevents the contaminants from accumulating in the discharge grooves, thus preventing the contaminants from biting into the planer protrusions.
1. A sliding member comprising:
a base material having a surface on which a sliding surface that slides against a counterpart member is formed; and
a resin coating formed on the surface of the base material, wherein the resin coating includes:
a first discharge groove that is formed on the sliding surface and extends in a first direction,
a second discharge groove that is formed on the sliding surface and extends in a second direction which is different from the first direction, and
a plurality of planar protrusions that are areas along the sliding surface other than the first and second discharge grooves, and that have corners where the first discharge groove and the second discharge groove meet with each other as viewed from a normal direction of the sliding surface,
wherein the corners of the planar protrusions are rounded as viewed from the normal direction of the sliding surface.
2. The sliding member according to claim 1 , wherein
the first and second discharge grooves form a lattice-shape as viewed from the normal direction of the sliding surface, and
each of the planar protrusions has a square shape with the rounded corners as viewed from the normal direction of the sliding surface.
3. The sliding member according to claim 1 , wherein
the first and second discharge grooves include:
a plurality of straight grooves extending in a radial direction as viewed from the normal direction of the sliding surface, and
at least one annular groove that intersects the straight grooves.
4. The sliding member according to claim 1 , wherein
the first and second discharge grooves include a V-shaped groove in which an end on an outer side is open at an outer circumferential part and an end on an inner side is open at an inner circumferential part, as viewed from the normal direction of the sliding surface.
5. The sliding member according to claim 1 , wherein
the planar protrusions have a wider area than that of the first and second discharge grooves.
6. The sliding member according to claim 1 , wherein
the sliding member is a thrust bearing of a scroll compressor or a thrust race that slides with respect to the thrust bearing, and
the first and second discharge grooves further function as a lubricating oil channel through which lubricating oil circulates.
7. The sliding member according to claim 1 , wherein
the first and second discharge grooves are formed on the surface of the base material, and
the resin coating has a uniform thickness over an entire surface of the base material.
8. The sliding member according to claim 1 , wherein
the surface of the base material is flat, and
the first and second discharge grooves are only formed in the resin coating.
9. The sliding member according to claim 1 , wherein
the first and second discharge grooves penetrate the resin coating to reach an inner part of the base material.
10. The sliding member according to claim 1 , wherein
the planar protrusions have straight sides as viewed from the normal direction of the sliding surface.
11. A method of manufacturing a sliding member comprising:
applying a resin coating to a surface of a base material;
forming a first discharge groove in the resin coating, the first discharge groove extending in a first direction; and
forming a second discharge groove in the resin coating, the second discharge groove extending in a second direction which is different from the first direction;
wherein the first and second discharge grooves form a plurality of planar protrusions that are areas along the surface other than the first and second discharge grooves and that have corners where the first discharge groove and the second discharge groove meet with each other as viewed from a normal direction of the surface, and
wherein the corners of the planar protrusions are rounded as viewed from the normal direction of the surface.