# US 8,770,355 B2 · Brake disk > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,355 B2 - Document ID: US8770355B2 - Status: Granted - Kind: B2 - Application number: 12/680,006 - Filed: 2008-07-15 - Published: 2010-10-14 - Granted: 2014-07-08 - Earliest claimed: 2007-09-28 - Assignees: Faiveley Transport Witten GmbH - Applicants: Heinz-Jurgen Gaspers; Helmut Hoffmann - Inventors: Heinz-Jurgen Gaspers; Helmut Hoffmann - Web page: https://patentgrep.com/patent/US8770355B2 ## CPC - F16D 65/123: {comprising an annular disc secured to a hub member; Discs characterised by means for mounting} - F16D 65/128: {characterised by means for cooling} - F16D 65/847: with open cooling system, e.g. cooled by air - F16D 2065/1328: {internal cavities, e.g. cooling channels} - F16D 2065/1384: {to wheel hub} - F16D 2065/1392: {Connection elements} - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract The invention relates to a brake disk having a face-end friction ring portion on which a brake disk cam provided with a cam bore is molded. In order to further develop the brake disk in such a manner that adequate safeties with respect to the permissible material values on brake disks for high-energy application cases are provided and material stresses in the region of the brake disk cam of the brake disk, which are caused through temperature differentials within the brake disk as a consequence of high braking energy inputs, are reduced, the brake disk cam includes two arm parts which extend spaced from each other from the face-end friction ring portion in the direction of the cam bore and converge in front of the cam bore. ## Claims ### Claim 1 A brake disk having a face-end friction ring portion on which a brake disk cam provided with a circular cam bore is moulded, wherein the brake disk cam is configured to connect the brake disk to a hub, characterised in that the brake disk cam comprises two arm parts which extend spaced from each other from the face-end friction ring portion in the direction of the circular cam bore and converge in front of the circular cam bore and behind the circular cam bore, and in that the arm parts each comprise a web which are moulded on the face-end friction ring portion and which are followed by arms which are substantially arranged parallel and spaced from the face-end friction ring portion. ### Claim 2 (depends on 1) The brake disk according to claim 1, characterised in that the arm parts extend in the direction of an inner edge of the face-end friction ring portion. ### Claim 3 (depends on 2) The brake disk according to claim 2, characterised in that the cam bore is arranged offset from the inner edge. ### Claim 4 (depends on 1, 2, 3) The brake disk according to any of claims 1-3, characterised in that the radius of the webs increases towards the surface of the face-end friction ring portion. ### Claim 5 (depends on 1, 2, 3) The brake disk according to any of claims 1-3, characterised in that the brake disk cam tapers towards the cam bore. ### Claim 6 (depends on 2) The brake disk according to claim 2, characterised in that the brake disk cam is moulded in an arcuate shape on a side facing away from the webs. ### Claim 7 (depends on 6) The brake disk according to claim 6, characterised in that the webs are configured inclined in axial direction and towards the inner edge. ### Claim 8 (depends on 7) The brake disk according to claim 7, characterised in that the arms are laterally extended away from each other in the direction of an outer edge of the face-end friction ring portion. ### Claim 9 (depends on 1, 2, 3, 6, 7, 8) The brake disk according to any of claims 1-3 or 6-8, characterised in that the arms on their narrow sides which converge in front of the cam bore are arcuately shaped. ### Claim 10 (depends on 1, 2, 3, 6, 7, 8) The brake disk according to any of claims 1-3 or 6-8, characterised in that the brake disk cam on a side facing away from the web is configured oval in shape. ### Claim 11 (depends on 8) The brake disk according to claim 8, characterised in that the brake disk cam is arranged between cooling ribs. ### Claim 12 (depends on 11) The brake disk according to claim 11, characterised in that between brake disk cam and an outer edge of the face-end friction ring portion, the cooling ribs are arranged. ### Claim 13 (depends on 1, 2, 3, 6, 8, 11, 12) The brake disk according to any of claims 1-3, 6, 8, 11 or 12, characterised in that the brake disk cam is arrange proximate to the inner edge of the friction ring portion.