# US 9,518,606 B2 · Bearing apparatus with surface migration channels > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,606 B2 - Document ID: US9518606B2 - Status: Granted - Kind: B2 - Application number: 14/641,876 - Filed: 2015-03-09 - Published: 2016-09-15 - Granted: 2016-12-13 - Earliest claimed: 2015-03-09 - Assignees: Seagate Technology LLC - Applicants: Seagate Technology LLC - Inventors: Zheng Shi; Jeffrey Robert Lind; Glenn A. Benson - Web page: https://patentgrep.com/patent/US9518606B2 ## CPC - F16C 33/6681: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements} - F16C 19/26: with a single row of rollers - F16C 33/414: {formed as one-piece cages, i.e. monoblock comb cages} - F16C 33/6629: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements} - G11B 5/48: Disposition or mounting of heads {or head supports} relative to record carriers {(mounting of head within housing G11B5/105); arrangements of heads, e.g. for scanning the record carrier to increase the relative speed (driving of both record carriers and head G11B15/18; guiding record carriers G11B15/60; head selecting circuits G11B15/12)} - G11B 5/4813: {Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm (G11B5/484 takes precedence)} - G11B 25/043: {using rotating discs} - G11B 33/1473: {of/from bearings} - F16C 2370/12: Hard disk drives or the like - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Aspects of the present disclosure are directed to bearings, their manufacture and implementation. As may be implemented in accordance with one or more embodiments, an apparatus includes a bearing cage with a plurality of ball pockets at respective locations along a length of the bearing cage. Each ball pocket holds a ball. A plurality of lubricant reservoirs are respectively located between adjacent ones of the ball pockets along the length of the bearing cage. A plurality of lubricant migration channels are recessed in the bearing cage, extend between and connect one of the lubricant reservoirs and one of the ball pockets, and flow lubricant between the one of the lubricant reservoirs and the one of the ball pockets. ## Claims ### Claim 1 An apparatus comprising: a bearing cage having a length; a plurality of ball pockets at respective locations along the length of the bearing cage, each ball pocket being configured and arranged to hold a ball; a plurality of lubricant reservoirs between adjacent ones of the ball pockets along the length of the bearing cage; and a plurality of lubricant migration channels recessed in the bearing cage, each lubricant migration channel extending between and connecting one of the lubricant reservoirs and one of the ball pockets and being configured and arranged to flow lubricant between the one of the lubricant reservoirs and the one of the ball pockets. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the bearing cage has respective sidewalls extending along the length and defining a thickness of the bearing cage; each ball pocket is defined by a portion of the bearing cage extending along the thickness; each lubricant reservoir has an opening defined by a portion of the bearing cage between adjacent ones of the ball pockets and is configured and arranged to contain lubricant in the opening; and each lubricant migration channel has sidewalls confined within the thickness of the bearing cage between the sidewalls thereof. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the sidewalls of the bearing cage are concentric and face one another in a direction along the thickness of the bearing cage. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the bearing cage has sidewalls that define a thickness of the bearing cage and that have a height that extends from an upper surface to a lower surface, and each of the lubricant migration channels includes a slot having sidewalls that extend from the upper surface toward the lower surface along the direction of the height, and that extend between one of the lubricant reservoirs and one of the ball pockets. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the lubricant reservoirs extend from an opening at the upper surface to a bottom reservoir surface recessed below the upper surface and above the lower surface, and each slot extends from the upper surface to a bottom slot surface having a depth that is at least as deep as a depth at which the bottom reservoir surface is recessed. ### Claim 6 (depends on 4) The apparatus of claim 4, wherein the lubricant reservoirs extend from an opening at the upper surface to a bottom reservoir surface recessed below the upper surface and above the lower surface, and each slot extends from the upper surface to a bottom slot surface having a depth that is less than a depth at which the bottom reservoir surface is recessed. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the bearing cage has sidewalls that define a thickness of the bearing cage and that have a height that extends from an upper surface to a lower surface, and each of the lubricant migration channels includes an opening extending through and enclosed by a portion of the bearing cage, each opening being recessed between the upper surface and the lower surface and extending between one of the lubricant reservoirs and one of the ball pockets. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the bearing cage has respective sidewalls that face each other and extend along the length of the bearing cage; and each of the lubricant migration channels includes a groove in a portion of one of the sidewalls of the bearing cage, the groove extending between one of the lubricant reservoirs and one of the ball pockets, the groove being configured and arranged to flow lubricant from the one of the lubricant reservoir to the one of the ball pockets. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the groove extends along a surface of the bearing cage that defines the one of the lubricant reservoirs. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the lubricant reservoirs extend from an opening at an upper surface of the bearing cage to a bottom reservoir surface recessed from the upper surface and above a lower surface of the bearing cage. ### Claim 11 (depends on 1) The apparatus of claim 1, further including a plurality of balls, each of the balls being held by one of the ball pockets. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the bearing cage is circular and has an inner surface and an outer surface that is concentric with the inner surface, further including: an inner bearing race having a ball groove on an outer surface thereof; and an outer bearing race that is concentric with the inner bearing race and that has a ball groove on an inner surface thereon and that is configured and arranged with the inner bearing race, the bearing cage and balls to affix the balls and the bearing cage between the inner bearing race and the outer bearing race via the ball grooves. ### Claim 13 (depends on 1) The apparatus of claim 1, wherein the bearing cage has respective sidewalls extending along the length and defining a thickness of the bearing cage, with a portion of the sidewalls extending between each ball pocket and one of the lubricant reservoirs; and each lubricant migration channel has surfaces defined by the bearing cage and having a surface area that is at least twice a surface area of the portion of the sidewalls extending between each ball pocket and one of the lubricant reservoirs, the surfaces of each lubricant migration channel being configured and arranged to flow lubricant from the lubricant reservoirs to the ball pockets via capillary action. ### Claim 14 (depends on 1) The apparatus of claim 1, further comprising: a disc configured and arranged to store data; a head configured and arranged to read data from the disc and to write data to the disc; an actuator arm having a first portion connected to the head; a pivot spindle connected to a second portion of the actuator arm and configured and arranged with the actuator arm to move the head relative to the disc for accessing data stored at different locations on the disc, the pivot spindle having a bearing component including: the bearing cage; the plurality of pockets; in each of the pockets, a ball; a bearing race having a channel and configured and arranged with the balls and the cage to provide rotation of the pivot spindle via rotation of the bearing cage and movement of the balls in the channel; the plurality of lubricant reservoirs; and the plurality of lubricant migration channels. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the bearing cage has respective sidewalls extending along the length and defining a thickness of the bearing cage, with a portion of the sidewalls extending between each pocket and one of the lubricant reservoirs; each pocket is defined by a portion of the bearing cage extending along the thickness; each lubricant reservoir has an opening defined by a portion of the bearing cage between adjacent ones of the pockets and is configured and arranged to contain lubricant in the opening; and each lubricant migration channel has sidewalls confined within the thickness of the bearing cage between the sidewalls thereof, and having a surface area that is at least twice a surface area of the portion of the sidewalls extending between each ball pocket and one of the lubricant reservoirs, the surfaces of each lubricant migration channel being configured and arranged to flow lubricant from the lubricant reservoirs to the ball pockets via capillary action. ### Claim 16 An apparatus comprising: a plurality of first portions of a bearing cage, each first portion being spaced apart from other ones of the first portions and being configured and arranged to hold a rolling component; a plurality of second portions of the bearing cage, each second portion being located between adjacent ones of the first portions and configured and arranged to hold lubricant; and a plurality of third portions of the bearing cage, each third portion extending between and connecting one of the second portions with one of the first portions, and each third portion including lubricant migration channels recessed in the third portion and configured and arranged to flow lubricant between the one of the second portions and a rolling component held by one of the first portions. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the bearing cage has respective sidewalls extending along a length of the bearing cage and defining a thickness of the bearing cage; each first portion is defined by a portion of the bearing cage extending along the thickness; each second portion has an opening defined by a portion of the bearing cage between adjacent ones of the first portions and is configured and arranged to contain lubricant in the opening; and each lubricant migration channel has sidewalls confined within the thickness of the bearing cage between the sidewalls of the bearing cage. ### Claim 18 (depends on 16) The apparatus of claim 16, wherein the first portions are configured and arranged to hold a rolling component selected from the group of a ball and a roller. ### Claim 19 (depends on 16) The apparatus of claim 16, wherein the bearing cage has sidewalls that define a thickness of the bearing cage and that have a height that extends from an upper surface to a lower surface, and each third portion includes a slot having sidewalls that extend from the upper surface toward the lower surface along the direction of the height, and that extend between one of the first portions and one of the second portions. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the bearing cage has respective sidewalls extending along a length of the bearing cage and defining a thickness of the bearing cage, with a portion of the sidewalls extending between each first portion and one of the second portions; and each third portion has surfaces defined by the bearing cage and having a surface area that is at least twice a surface area of the portion of the sidewalls extending between each first portion and one of the second portions, the surfaces of each third portion being configured and arranged to flow lubricant from the second portions to the first portion via capillary action.