# US 9,518,617 B2 · Integrated leaf spring and seal retention > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,617 B2 - Document ID: US9518617B2 - Status: Granted - Kind: B2 - Application number: 14/274,918 - Filed: 2014-05-12 - Published: 2014-11-20 - Granted: 2016-12-13 - Earliest claimed: 2013-05-14 - Assignees: Schaeffler Technologies AG & Co. KG - Applicants: Schaeffler Technologies GmbH & Co. KG - Inventors: Jonathan Jameson - Web page: https://patentgrep.com/patent/US9518617B2 ## CPC - F16D 13/71: in which the clutching pressure is produced by springs only - 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 33/18: Details (applicable also to fluid gearing F16H41/24) - F16D 25/0635: with flat friction surfaces, e.g. discs - F16D 2013/706: {the axially movable pressure plate is supported by leaf springs} - F16H 45/02: with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) - Y10T 29/49249: Piston making - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - F16H: GEARING - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A drive assembly for a drive assembly or transmission is provided. The drive assembly includes a front cover; a piston plate slidable axially toward and away from the front cover; a connection plate axially between the front cover and the piston plate elastically connecting the front cover and piston plate to each other; and at least one seal along at least one radial end of the piston plate, the connection plate and the piston plate retaining the at least one seal axially therebetween. A method of forming a drive assembly is also provided. ## Claims ### Claim 1 A drive assembly for a torque converter or transmission comprising: a front cover; a piston plate slidable axially toward and away from the front cover; a connection plate axially between the front cover and the piston plate elastically connecting the front cover and piston plate to each other, the connection plate being a single piece directly connected to the front cover by first fasteners and directly connected to the piston by second fasteners; and at least one seal along at least one radial end of the piston plate, the connection plate and the piston plate retaining the at least one seal axially therebetween, the connection plate including at least one leaf spring formed therein elastically connecting the front cover and the piston plate, at least one of the front cover and the piston plate being riveted to the at least one leaf spring, the at least one leaf spring including a free end and a base end, the free end and the base end being defined by spaces in an interior of the connection plate between an inner circumference and an outer circumference of the connection plate, the leaf spring including a radially outer edge extending circumferentially from the free end to the base end, the radially outer edge being radially offset from and radially inside of the outer circumference of the connecting plate. ### Claim 2 (depends on 1) The drive assembly as recited in claim 1 wherein the at least one of the front cover and the piston plate riveted to the at least one leaf spring by rivets extruded from the front cover. ### Claim 3 (depends on 1) The drive assembly as recited in claim 1 wherein the at least one leaf spring includes a circumferentially inner hole and a circumferentially outer hole formed therein, the front cover being riveted through the circumferentially outer holes, the piston plate being riveted through the circumferentially inner hole. ### Claim 4 (depends on 1) The drive assembly as recited in claim 1 wherein the connection plate and the piston plate define at least one coined groove retaining the at least one seal axially therebetween. ### Claim 5 (depends on 4) The drive assembly as recited in claim 4 wherein the at least one seal includes an inner radial seal and an outer radial seal, the at least one coined groove including a radially outer coined groove retaining the radial outer seal axially therebetween and a radially inner coined groove retaining the radial inner seal axially therebetween. ### Claim 6 (depends on 1) The drive assembly as recited in claim 1 further comprising an inner radial support surface, the at least one seal including a radial inner seal slidable along the inner radial support surface via movement of the piston plate. ### Claim 7 (depends on 1) The drive assembly as recited in claim 1 further comprising an outer radial support surface, an axially slidable clutch plate and a clutch backing plate axially held at the outer radial support surface configured for limiting axial movement of the clutch plate, the at least one seal including a radial outer seal slidable along the outer radial support surface via movement of the piston plate, the piston plate and the connection plate being axially movable away from the front cover so the piston plate forces the clutch plate against the clutch backing plate. ### Claim 8 (depends on 1) A torque converter comprising the drive assembly recited in claim 1. ### Claim 9 (depends on 1) A transmission comprising the drive assembly recited in claim 1. ### Claim 10 A method of forming a drive assembly for a converter or transmission comprising: connecting a piston plate to a front cover through a connecting plate axially between the front cover and the piston plate such that the piston plate is slidable axially toward and away from the front cover, the connection plate being a single piece directly connected to the front cover by first fasteners and directly connected to the piston by second fasteners; and retaining at least one seal axially between the connection plate and the piston plate along at least one radial end of the piston plate, at least one of the front cover and the piston plate being riveted to at least one leaf spring, the at least one leaf spring including a free end and a base end, the free end and the base end being defined by spaces in an interior of the connection plate between an inner circumference and an outer circumference of the connection plate, the leaf spring including a radially outer edge extending circumferentially from the free end to the base end, the radially outer edge being radially offset from and radially inside of the outer circumference of the connecting plate. ### Claim 11 (depends on 10) The method as recited in claim 10 wherein the connecting includes riveting the front cover to the at least one leaf spring with a rivet extruded from the front cover. ### Claim 12 (depends on 10) The method as recited in claim 10 wherein the connecting includes riveting the piston plate to the at least one leaf spring. ### Claim 13 (depends on 10) The method as recited in claim 10 wherein the retaining includes holding the at least one seal in at least one coined groove defined by at least one radial end of the piston plate and at least one radial end of the connection plate. ### Claim 14 (depends on 13) The method as recited in claim 13 wherein the at least one seal includes an inner radial seal and an outer radial seal, the at least one coined groove including a radial inner coined groove defined by radial inner ends of the piston plate and the connection plate, the at least one coined groove including a radial outer coined groove defined by radial outer ends of the piston plate and the connection plate, the retaining including holding the inner radial seal in the radial inner coined groove and holding the outer radial seal in the radial outer coined groove. ### Claim 15 (depends on 14) The method as recited in claim 14 further comprising providing the connection plate and piston plate between an inner radial support surface and an outer radial support surface such that the inner radial seal slides axially along the inner radial support surface and the outer radial seal slides axially along the outer radial support surface as the connection plate and piston plate move axially toward and away from the front cover. ### Claim 16 (depends on 10) The method as recited in claim 10 further comprising providing a clutch plate for engagement with the piston plate, the piston plate being axially between the clutch plate and the front cover. ### Claim 17 (depends on 7) The drive assembly as recited in claim 7 further comprising a retainer held in a groove in the outer radial support surface axially retaining the clutch backing plate. ### Claim 18 A drive assembly for a torque converter or transmission comprising: a front cover; a piston plate slidable axially toward and away from the front cover; a connection plate axially between the front cover and the piston plate elastically connecting the front cover and piston plate to each other, the connection plate being a single piece directly connected to the front cover by first fasteners and directly connected to the piston by second fasteners; at least one seal along at least one radial end of the piston plate, the connection plate and the piston plate retaining the at least one seal axially therebetween; an outer radial support surface; an axially slidable clutch plate; and a clutch backing plate axially held at the outer radial support surface configured for limiting axial movement of the clutch plate, the at least one seal including a radial outer seal slidable along the outer radial support surface via movement of the piston plate, the piston plate and the connection plate being axially movable away from the front cover so the piston plate forces the clutch plate against the clutch backing plate. ### Claim 19 (depends on 18) The drive assembly as recited in claim 18 further comprising a retainer held in a groove in the outer radial support surface axially retaining the clutch backing plate.