HYDRODYNAMIC AXIAL BEARING
The invention relates to an axial bearing comprising a slide ring ( 1 ), a counter-ring ( 2 ) and an elastic mounting ( 3 ) of the slide ring, wherein the slide ring ( 1 ) is integral and has a structuring on the running surface thereof which enables the development of a stable, hydrodynamic lubricating film and wherein the structuring of the running surface occurs so that the running surface has three or more elevations ( 6 ), wherein the contact surfaces ( 8 ) thereof are even with the counter-ring ( 2 ).
1 . Axial bearing comprising a sliding ring ( 1 ), a counter-ring ( 2 ), and an elastic mounting ( 3 ) of the sliding ring, whereby the sliding ring ( 1 ) is monolithic and possesses a texture on its running surface that enables the build-up of a stable hydrodynamic lubricating film, and whereby the texturing of the running surface is such that the running surface possesses three or more projections ( 6 ) whose contact surface ( 8 ) with the counter-ring ( 2 ) is flat.
2 . Axial bearing according to claim 1 , whereby the projections ( 6 ) of the running surface are step-shaped along the rotational direction.
3 . Axial bearing according to claim 1 , whereby the entire contact surface ( 8 ) of the projections ( 6 ) of the running surface amounts to maximum 50%, and preferably maximum 30%, and especially preferably maximum 20% of the running surface ( 9 ) projected onto a plane parallel to the contact surface.
4 . Axial bearing according to claim 1 , whereby the entire contact surface ( 8 ) of the projections ( 6 ) of the running surface amount to 5-30%, and preferably 10-20%, of the projected running surface ( 9 ).
5 . Axial bearing according to claim 1 , whereby the projections ( 6 ) are evenly distributed across the running surface.
6 . Axial bearing according to claim 1 , whereby three projections ( 6 ) are located 120° from one another.
7 . Axial bearing per one of claim 1 , whereby the height of the projections ( 6 ) is between 0.1 mm and 1 mm.
8 . Axial bearing according to claim 1 , whereby at least one bearing ring of the sliding ring/counter-ring pair is made of a polymer material.
9 . Axial bearing according to claim 8 , whereby the sliding ring ( 1 ) is made of the polymer material.
10 . Axial bearing according to claim 8 , whereby both the sliding ring ( 1 ) and the counter-ring ( 2 ) are made of a polymer material.
11 . Axial bearing according to claim 8 , whereby the polymer material is selected from the group consisting of thermo-plastic materials, duro-plastic materials, and elastomers.
12 . Axial bearing according to claim 8 , whereby the polymer material is selected from the group consisting of epoxy resin, PTFE, Polyimide, Polyurethanes, thermo-plastic elastomers (TPE), Polyetherimide, Polyphenylene sulfide, Polyether ether-ketone, and liquid-crystal polymers.
13 . Axial bearing according to claim 8 , whereby the e-modulus of the polymer material is at least 7 GPa.
14 . Axial bearing according to claim 8 , whereby the polymer material comprises additional reinforcing fibers, preferably carbon or aramide fibers.
15 . Axial bearing according to claim 8 , whereby the polymer material comprises additional reinforcing particles, preferably silicon carbide, boron carbide, aluminum oxide, and/or silicon oxide particles, particularly preferably silicon carbide particles.
16 . Axial bearing according to claim 15 , whereby the content of hard particles lies between 1-30% by weight.
17 . Axial bearing according to claim 14 , whereby the total content of fibers and hard particles is 1-40% by weight, and particularly preferably 20-40%.
18 . Axial bearing according to claim 1 , whereby the bearing surface of the counter-ring ( 2 ) is polished.
19 . Axial bearing according to claim 1 , whereby the counter-ring ( 2 ) is made of a dense, fine-grained sintered ceramic, preferably of aluminum oxide or sintered silicon carbide (SSiC).
20 . Axial bearing according to claim 1 , whereby the sliding ring ( 1 ) is made of sintered ceramic, graphite, cemented carbide, metal, or bronze.