# US 9,752,625 B2 · Dual clutch comprising two clutch units which act in a force-fitting manner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,625 B2 - Document ID: US9752625B2 - Status: Granted - Kind: B2 - Application number: 14/651,481 - Filed: 2013-12-10 - Published: 2015-11-19 - Granted: 2017-09-05 - Earliest claimed: 2012-12-12 - Assignees: Stromag, Inc. - Applicants: Gkn Stromag AG - Inventors: Hendrik Datema; Matthias Glomm; Thomas Haeseker - Web page: https://patentgrep.com/patent/US9752625B2 ## CPC - F16D 21/06: at least two driving shafts or two driven shafts being concentric - F16D 13/52: Clutches with multiple lamellae {; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member (F16D13/385 takes precedence)} - F16D 13/69: Arrangements for spreading lamellae in the released state - F16D 13/70: Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members {(clutch flywheels comprising two or more masses with a rotational damper F16F15/12)} - F16D 25/0638: with more than two discs, e.g. multiple lamellae - F16D 25/10: Clutch systems with a plurality of fluid-actuated clutches (arrangements or mounting of clutches in vehicles B60K17/00) - F16D 2021/0607: {Double clutch with torque input plate in-between the two clutches, i.e. having a central input plate} - F16D 2021/0661: {Hydraulically actuated multiple lamellae clutches} - F16D 2021/0676: {Mechanically actuated multiple lamellae clutches} - F16D 2021/0692: {with two clutches arranged axially without radial overlap} - F16D 2300/12: Mounting or assembling - F16D 2300/14: Clutches which are normally open, i.e. not engaged in released state - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract Dual clutch including two clutch units acting in a force-fitting manner and mounted on a common clutch hub in a rotationally fixed and axially movable manner, a pressure disk arrangement retained between the clutch units on the clutch hub in an axially fixed manner and including two axially movable pressure pistons each of which can be ventilated by a compression spring arrangement positioned in the clutch hub. Each compression spring arrangement includes multiple compression springs, each of which is arranged in a recess of the clutch hub. Each recess is introduced into the clutch hub as an axially extending blind hole. The pressure disk arrangement is received in a radial groove of the clutch hub, the groove being radially and/or axially spaced from the blind holes. ## Claims ### Claim 1 A dual clutch comprising two clutch units mounted on a common clutch hub for conjoint rotation and axial movement in relation to an axis of clutch rotation, the dual clutch comprising a multipart pressure disk arrangement held in an axially fixed manner on the clutch hub between the clutch units, and two axially movable pressure pistons, each pressure piston being releasable by a compression spring arrangement positioned in the clutch hub, each compression spring arrangement comprising a plurality of compression springs, each of the compression springs being arranged in an aperture disposed in the clutch hub, each aperture comprising a blind hole, the pressure disk arrangement being disposed in a groove extending radially, in relation to the axis of clutch rotation, in the clutch hub, each of the blind holes extending axially inwardly, with respect to the axis of clutch rotation, within the clutch hub and having an axially innermost terminal end defined by a surface of the clutch hub disposed to close off the axially innermost terminal end, the blind holes being disposed in non-intersecting relation with the groove within the clutch hub. ### Claim 2 (depends on 1) The dual clutch as claimed in claim 1, wherein the blind holes and the groove are spaced-apart from one another so as not to communicate with one another. ### Claim 3 (depends on 1) The dual clutch as claimed in claim 1, wherein the groove has a radially innermost terminal end defined by a surface of the clutch hub and each of the blind holes defined in the clutch hub has an outermost radial extent defined by a substantially axially extending surface of the clutch hub, the radially innermost terminal end of the groove being disposed radially outwardly from the outermost radial extent of each of the blind holes. ### Claim 4 (depends on 1) The dual clutch as claimed in claim 1, wherein the groove and the blind holes are defined in the clutch hub so as not to communicate with one another within an interior of the clutch hub. ### Claim 5 (depends on 1) The dual clutch as claimed in claim 1, wherein the groove has a radially innermost area defined by the clutch hub, the radially innermost area of the groove being axially closed on opposite sides thereof by respective axially oriented surfaces of the clutch hub disposed immediately adjacent the radially innermost area of the groove. ### Claim 6 (depends on 1) The dual clutch as claimed in claim 1, wherein each of the blind holes opens axially outwardly from one axial side of the clutch hub and terminates axially inwardly from an opposite axial side of the clutch hub so as not to extend axially completely through the clutch hub. ### Claim 7 (depends on 1) The dual clutch as claimed in claim 1, wherein the pressure disk arrangement has a pair of semi-circular pressure disk segments oriented relative to one another to form a ring-shape and a carrier ring connected to the pressure disk segments, the pressure disk segments and the carrier ring all being disposed within the groove. ### Claim 8 The dual clutch as claimed in 7, wherein each pressure disk segment has an axially extending shoulder disposed at a radially inner area of the respective pressure disk segment, each shoulder having an axially extending surface facing radially outwardly, the carrier ring being disposed adjacent the axially extending surfaces. ### Claim 9 (depends on 8) The dual clutch as claimed in claim 8, wherein an axial extent of the axially extending surface of each shoulder substantially corresponds to an axial thickness of the carrier ring. ### Claim 10 (depends on 8) The dual clutch as claimed in claim 8, wherein the axially extending surfaces are each disposed at a radial distance from a radially outer boundary edge of the respective pressure disk segment, each radial distance corresponding to a radial dimension of the carrier ring defined between inner and outer circumferences thereof. ### Claim 11 (depends on 1) The dual clutch as claimed in claim 1, wherein the carrier ring has a radial dimension defined between outer and inner circumferences thereof which substantially corresponds to an effective contact surface area of an adjacent one of the clutch units. ### Claim 12 (depends on 7) The dual clutch as claimed in claim 7, further including axially extending fastening elements which connect the pressure disk segments to the carrier ring. ### Claim 13 (depends on 1) The dual clutch as claimed in claim 1, wherein the pressure disk arrangement includes a pair of pressure disk segments, each pressure disk segment being semi-circular in shape and each having a pair of terminal ends, the pressure disk segments being mounted on the clutch hub with the terminal ends of one pressure disk segment disposed in facing and adjacent relation with the respective terminal ends of the other pressure disk segment such that the pressure disk segments together define a substantially continuous circular configuration. ### Claim 14 (depends on 13) The dual clutch as claimed in claim 13, wherein the pressure disk segments are circumferentially spaced apart from one another by a key disposed at a juncture defined between each adjacent and facing pair of terminal ends of the pressure disk segments, each key being fitted into a complementary key slot disposed in the clutch hub adjacent a radially inner end of the groove. ### Claim 15 (depends on 1) The dual clutch as claimed in claim 1, wherein each compression spring has an axially inner end disposed against the surface of the clutch hub and an axially outer end disposed to act on one of the pressure pistons. ### Claim 16 A dual clutch comprising two clutch units mounted on a common clutch hub for conjoint rotation and axial movement in relation to an axis of clutch rotation, the dual clutch comprising a multipart pressure disk arrangement held in an axially fixed manner on the clutch hub between the clutch units, and two axially movable pressure pistons, each pressure piston being releasable by a compression spring arrangement positioned in the clutch hub, each compression spring arrangement comprising a plurality of compression springs, each of the compression springs being arranged in an aperture disposed in the clutch hub, each aperture comprising a blind hole extending axially, with respect to the axis of clutch rotation, into the clutch hub through only a portion of an axial extent thereof, the pressure disk arrangement being disposed in a groove extending radially, with respect to the axis of clutch rotation, in the clutch hub, the blind holes being disposed within the clutch hub in non-intersecting relation with the groove. ### Claim 17 (depends on 16) The dual clutch as claimed in claim 16, wherein the blind holes and the groove are spaced-apart from one another so as not to communicate with one another within the clutch hub. ### Claim 18 (depends on 16) The dual clutch as claimed in claim 16, wherein each compression spring has an axially inner end disposed against a surface of the clutch hub, the surface defining an axially innermost terminal end of the corresponding blind hole, and an axially outer end disposed to act on one of the pressure pistons.