# US 2017/0284469 A1 · Bearing arrangement for a deep drilling device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284469 A1 - Document ID: US20170284469A1 - Status: Published application - Kind: A1 - Application number: 15/513,746 - Filed: 2015-09-03 - Published: 2017-10-05 - Earliest claimed: 2014-10-14 - Assignees: Schaeffler Technologies AG & Co. KG - Applicants: Schaeffler Technologies AG & Co. KG - Inventors: Stefan Scharting - Web page: https://patentgrep.com/patent/US20170284469A1 ## 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 17/02: for radial load only - F16C 19/08: with two or more rows of balls - F16C 19/181: {with angular contact} - F16C 19/522: {related to load on the bearing, e.g. bearings with load sensors or means to protect the bearing against overload} - F16C 21/00: Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement (F16C17/24, F16C19/52 take precedence) - F16C 33/3713: {with other rolling elements serving as spacing bodies, e.g. the spacing bodies are in rolling contact with the load carrying rolling elements} - F16C 33/60: divided {or split, e.g. comprising two juxtaposed rings} - F16C 39/02: using mechanical means - F16C 2240/46: Gap sizes or clearances - F16C 2240/70: Diameters; Radii - F16C 2352/00: Apparatus for drilling - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract The invention relates to a bearing arrangement for a drilling head, through which flushing liquid flows, of a deep drilling device, having multiple radially outer and radially inner bearing rings, wherein the radially outer bearing rings are arranged coaxially over the radially inner bearing rings, wherein, radially between the bearing rings, there are arranged balls which roll in raceways of the bearing rings, and wherein the raceways are delimited axially on both sides by shoulders with mutually opposite shoulder surfaces which run parallel to a bearing longitudinal axis. In order for a bearing arrangement of this type, which, as per the prior art, is adjoined in an axial direction by at least one plain bearing, to be designed to be of short axial extent and in order to simplify the construction, the internal diameter (Di) of the shoulder surfaces of the radially outer bearing rings and the external diameter (Da) of the shoulder surfaces of the radially inner bearing rings are dimensioned such that said shoulder surfaces perform the function of parallel radial plain bearings with a radial clearance (S). ## Claims ### Claim 1 A bearing arrangement for a drill head of a deep drilling device in which a flushing liquid flows through the drill head, the bearing arrangement comprising multiple radially outer and radially inner bearing rings, the radially outer bearing rings are arranged coaxial over the radially inner bearing rings, balls are arranged radially between the radially outer and radially inner bearing rings, said balls roll in raceways of the radially outer and radially inner bearing rings and the raceways are axially bounded on two sides by shoulders with shoulder surfaces that are opposite to each other and run parallel to a bearing longitudinal axis, an inner diameter (Di) of the shoulder surfaces of the radially outer bearing rings and an outer diameter (Da) of the shoulder surfaces of the radially inner bearing rings are dimensioned so that a radial play (S) that produces a function of parallel radial plain bearings. ### Claim 2 (depends on 1) The bearing arrangement according to claim 1, wherein the shoulder surfaces of at least one of the radially inner bearing rings or radially outer bearing rings have grooves for guiding the flushing liquid. ### Claim 3 (depends on 1) The bearing arrangement according to claim 1, wherein each said radially outer bearing ring, each said radially inner bearing ring, or each said radially outer bearing ring and each said radially inner bearing ring is divided centrally by the raceways in a plane perpendicular to the bearing longitudinal axis and forms a 4-point bearing. ### Claim 4 (depends on 1) The bearing arrangement according to claim 1, wherein the bearing arrangement has at least one row of the balls with the associated bearing rings and axial end rings on an end side have an axially longer design than is typical for 4-point bearings for drill heads for comparable operating loads. ### Claim 5 (depends on 1) The bearing arrangement according to claim 1, wherein multiple rows of the balls are assembled with the associated radially inner and radially outer bearing rings to form a bearing assembly and the bearing rings that are end rings have a longer design than the bearing rings arranged between said end rings. ### Claim 6 (depends on 1) The bearing arrangement according to claim 1, wherein a number of rows of the balls with the associated bearing rings is greater than is typical for 4-point bearings for drill heads for comparable operating loads. ### Claim 7 (depends on 1) The bearing arrangement according to claim 1, wherein at least one of the shoulder surfaces of the radially outer bearing rings or the shoulder surfaces of the radially inner bearing rings are provided with at least one of a friction-reducing or wear-reducing coating. ### Claim 8 (depends on 7) The bearing arrangement according to claim 7, wherein the at least one of the friction-reducing or wear-reducing coating is formed of a tribological layer system. ### Claim 9 (depends on 8) The bearing arrangement according to claim 8, wherein the tribological layer system is applied by a Triondur® method. ### Claim 10 (depends on 8) The bearing arrangement according to claim 8, wherein the at least one of the friction-reducing reducing or wear-reducing coating has diamond layers.