# US 8,739,946 B2 · Brake disc implemented as a casting and method of making same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,946 B2 - Document ID: US8739946B2 - Status: Granted - Kind: B2 - Application number: 13/344,346 - Filed: 2012-01-05 - Published: 2012-07-12 - Granted: 2014-06-03 - Earliest claimed: 2009-07-06 - Assignees: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH - Applicants: Wolfgang Pahle; Johann Baumgartner - Inventors: Wolfgang Pahle; Johann Baumgartner - Web page: https://patentgrep.com/patent/US8739946B2 ## CPC - F16D 65/123: {comprising an annular disc secured to a hub member; Discs characterised by means for mounting} - F16D 2065/1316: {radially segmented} - F16D 2065/1328: {internal cavities, e.g. cooling channels} - F16D 2065/1344: {permanent, e.g. by casting} - F16D 2065/136: {with relative movement radially} - F16D 2065/1368: {with relative movement both radially and axially} - F16D 2065/1392: {Connection elements} - F16D 2200/0013: Cast iron - F16D 2200/0021: Steel - F16D 2250/0015: around inserts - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A brake disc, in particular an internally ventilated brake disc, implemented as a casting includes a friction ring having an inner toothed rim and a neck materially separated therefrom and retained against rotation by an outer toothed rim. The neck is connecting to a wheel hub. Cast-in sliding elements are provided between the teeth to allow for a radial displacement of the friction ring relative to the neck. Each sliding element has a U-shape, the opposite legs thereof being disposed between the radially and axially oriented side faces of the associated teeth facing each other, wherein a web connecting the legs extends radially. ## Claims ### Claim 1 A cast brake disc, comprising: a friction ring having an inner toothed ring; a neck having an outer toothed ring, the neck being materially separate from the friction ring and retained against rotation by engagement of the outer toothed ring into the inner toothed ring of the friction ring; and cast-in sliding elements operatively arranged between the teeth to allow for radial movement of the friction ring relative to the neck, each sliding element having a U-shape whose opposing legs are arranged between radially and axially oriented extending side faces of friction ring and neck teeth facing toward one another, and a web of the U-shape connecting the legs extending radially. ### Claim 2 (depends on 1) The brake disc according to claim 1, wherein the sliding elements are shaped sheet metal parts. ### Claim 3 (depends on 2) The brake disc according to claim 2, wherein the sliding elements are formed with two plies, one ply being an outer ply and the other ply being an inner ply. ### Claim 4 (depends on 3) The brake disc according to claim 3, wherein the outer ply and the inner ply of respectively opposing legs have a positive locking mechanism to secure against axial displacement; and wherein the inner plies and the outer plies are movable radially with respect to one another. ### Claim 5 (depends on 4) The brake disc according to claim 4, wherein the radial moveability of the inner plies and the outer plies with respect to one another has a limited extent. ### Claim 6 (depends on 3) The brake disc according to claim 3, wherein the sliding elements are formed from a rectangular sheet metal strip. ### Claim 7 (depends on 3) The brake disc according to claim 3, wherein the outer ply is positively connected to an abutting tooth and the inner ply is positively connected to an abutting tooth. ### Claim 8 (depends on 1) The brake disc according to claim 1, wherein the brake disc is an internally ventilated brake disc having ventilation ducts operatively arranged between opposing friction surfaces of the friction ring. ### Claim 9 (depends on 8) The brake disc according to claim 8, wherein the sliding elements protrude into an inlet region of a cooling duct for the internally ventilated brake disc. ### Claim 10 (depends on 1) The brake disc according to claim 1, wherein the sliding elements are formed from a rectangular sheet metal strip. ### Claim 11 (depends on 10) The brake disc according to claim 10, wherein a wedge-shaped notch is arranged in a region of the web before forming the sheet metal strip into the U-shape. ### Claim 12 (depends on 1) The brake disc according to claim 1, wherein the sliding elements are formed with one ply, said ply being held positively on one side of one of the teeth. ### Claim 13 (depends on 12) The brake disc according to claim 12, wherein the one ply has a release coating on a contact surface lying opposite a side of the sliding element that faces the one of the teeth on which said ply is positively held. ### Claim 14 (depends on 1) The brake disc according to claim 1, wherein each sliding element encompasses an associated tooth of the inner toothed ring. ### Claim 15 (depends on 3) The brake disc according to claim 3, wherein the outer ply of a respective leg is connected at least one of frictionally and positively to an inner ply of the respective leg as a separate sheet metal part. ### Claim 16 (depends on 1) The brake disc according to claim 1, wherein the inner toothed ring, the outer toothed ring, and the sliding elements extend flush with one another circumferentially on an inner side of the brake disc. ### Claim 17 A method of making a brake disc, the method comprising the acts of: arranging sliding elements in a casting mold for the brake disc having a friction ring with an inner toothed ring and a neck with an outer toothed ring, the inner and outer toothed rings engaging one another with the sliding elements being interposed therebetween, the sliding elements having a U-shape with the opposing legs being interposed between the teeth and a web connecting the legs extending circumferentially so as to encompass an inner tooth of the friction ring; casting the brake disc in one-piece so as to enclose with an inner collar a radially inner side of the sliding elements; and machining away the inner-collar to expose the radially inner side of the sliding elements such that the friction ring and neck are materially separated from one another via the sliding elements. ### Claim 18 (depends on 17) The method according to claim 17, further comprising the act of: forming the sliding elements as sheet metal parts having two plies, an inner ply of each leg engaging with an outer ply of each leg to allow for a defined amount of radial movement and a defined amount of axial movement. ### Claim 19 (depends on 18) The method according to claim 18, wherein the two ply sliding elements are formed from a single ply sheet metal part that is folded over upon itself at a bending edge, the bending edge being removed during the machining act to allow for the radial movement between the inner and outer plies. ### Claim 20 (depends on 18) The method according to claim 18, wherein the outer ply of each leg is a separate sheet metal part that has a positive connection to the inner ply, the positive connection being machined away during the machining act to allow for the radial movement.