# US 10,442,047 B2 · Active water cooling of gear mechanisms by means of a geometrically specially formed insert in diamond drilling devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,442,047 B2 - Document ID: US10442047B2 - Status: Granted - Kind: B2 - Application number: 15/580,938 - Filed: 2016-06-06 - Published: 2018-06-14 - Granted: 2019-10-15 - Earliest claimed: 2015-06-10 - Assignees: Hilti Aktiengesellschaft - Applicants: Hilti Aktiengesellschaft - Inventors: Konstantin Baxivanelis; Thomas Reichenberger - Web page: https://patentgrep.com/patent/US10442047B2 ## CPC - B23Q 11/1015: {by supplying a cutting liquid through the spindle} - B23B 51/042: {with lubricating or cooling equipment} - B23B 51/0486: {with lubricating or cooling equipment (B23B51/042 takes precedence)} - B23Q 11/127: {for cooling motors or spindles} - B28D 7/02: for removing or laying dust, e.g. by spraying liquids; for cooling work - E21B 3/02: Surface drives for rotary drilling - E21B 17/006: {Accessories for drilling pipes, e.g. cleaners (wear protectors E21B17/10; handling drilling pipes E21B19/00; thread protectors B65D59/00)} - B23B 51/044: {with core holding devices} - B23B 2226/75: Stone, rock or concrete - B23B 2250/12: Cooling and lubrication - E21B 25/00: Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B28D: WORKING STONE OR STONE-LIKE MATERIALS - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A drive shaft for a machine tool is connectable to a drilling tool. The drive shaft contains a cavity extending substantially over the entire length of the drive shaft and along the axis of rotation where the cavity contains an inflow opening through which water can be fed along the drive shaft into the drilling tool. An insert device is provided in the cavity, through which, to cool the drive shaft, the water is guided first in a first direction and then in a second direction where the insert device contains a first curved guide element and a second curved guide element for separating the water which is guided in the first direction from the water which is guided in the second direction. The cross-sectional area of the first curved guide element is designed point-symmetrically about a center longitudinal axis to the cross-sectional area of the second curved guide element. ## Claims ### Claim 1 A drive shaft of a machine tool that is connectable to a drilling tool, comprising: a cavity, wherein the cavity extends substantially over an entire length of the drive shaft and along an axis of rotation and wherein the cavity contains an inflow opening through which water is feedable along the drive shaft into the drilling tool; and an insert device disposed in the cavity through which the water is guidable first in a first direction and then in a second direction, wherein the insert device contains a first curved guide element and a second curved guide element for separating water which is guided in the first direction from water which is guided in the second direction, wherein a cross-sectional area of the first curved guide element is designed point-symmetrically about a center longitudinal axis to a cross-sectional area of the second curved guide element, and wherein the first curved guide element and the second curved guide element extend along an entire length of the insert device; wherein the machine tool is a core drilling machine. ### Claim 2 (depends on 1) The drive shaft according to claim 1, wherein the insert device contains a support element and wherein the insert device is supportable in the cavity by the support element. ### Claim 3 (depends on 1) The drive shaft according to claim 1, wherein the insert device contains a positioning element which is engageable into a corresponding positioning opening on the cavity and wherein a relative movement between the insert device and the drive shaft is prevented by the positioning element. ### Claim 4 (depends on 1) The drive shaft according to claim 1, wherein the insert device contains a separation wall element and wherein the separation wall element guides the water into the first direction and locks the insert device in the cavity. ### Claim 5 An insert device disposed in a cavity of a drive shaft of a machine tool that is connectable to a drilling tool, comprising: a first curved guide element and a second curved guide element for separating water which is guided in a first direction from water which is guided in a second direction, wherein a cross-sectional area of the first curved guide element is designed point-symmetrically about a center longitudinal axis to a cross-sectional area of the second curved guide element and wherein the first curved guide element and the second curved guide element extend along an entire length of the insert device; wherein the machine tool is a core drilling machine. ### Claim 6 A drive shaft of a machine tool that is connectable to a drilling tool, comprising: a cavity, wherein the cavity extends substantially over an entire length of the drive shaft and along an axis of rotation and wherein the cavity contains an inflow opening; and an insert device disposed in the cavity, wherein the insert device contains a first curved guide element and a second curved guide element, wherein a cross-sectional area of the first curved guide element is designed point-symmetrically about a center longitudinal axis to a cross-sectional area of the second curved guide element, and wherein the first curved guide element and the second curved guide element extend along an entire length of the insert device; wherein the machine tool is a core drilling machine.