# US 2019/0170201 A1 · Rotational Coupling Device Having Means for Sealing the Interface Between the Armature and the Electromagnet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170201 A1 - Document ID: US20190170201A1 - Status: Published application - Kind: A1 - Application number: 15/833,574 - Filed: 2017-12-06 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Warner Electric Technology LLC - Applicants: Warner Electric Technology LLC - Inventors: Joseph Mark Godinsky - Web page: https://patentgrep.com/patent/US20190170201A1 ## CPC - F16D 65/0025: {Rust- or corrosion-preventing means} - F16D 55/02: with axially-movable discs or pads pressed against axially-located rotating members - F16D 55/22: by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads - F16D 59/02: spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means - F16D 65/0031: {Devices for retaining friction material debris, e.g. dust collectors or filters} - F16D 65/186: {with full-face force-applying member, e.g. annular} - F16D 2121/14: Mechanical - F16D 2121/22: for releasing a normally applied brake - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A rotational coupling device includes a rotor configured for rotation about a rotational axis, a brake plate disposed on a first axial side of the rotor, an armature disposed on a second axial side of the rotor opposite the brake plate, and an electromagnet disposed on one axial side of the armature opposite the rotor and the brake plate. A spacer is disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature. A seal is supported on a radially inner surface of the spacer radially outward of the armature and seals the interface between armature and electromagnet. ## Claims ### Claim 1 A rotational coupling device, comprising: a rotor configured for rotation about a rotational axis; a brake plate disposed on a first axial side of the rotor; an armature disposed on a second axial side of the rotor opposite the brake plate; an electromagnet disposed on a first axial side of the armature opposite the rotor and the brake plate; a spacer disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature; and, a seal supported on a radially inner surface of the spacer radially outward of the armature, the seal sealing an interface between the armature and the electromagnet and inhibiting particulates second axial side of the armature facing the rotor from travelling to the first axial side of the armature. ### Claim 2 A rotational coupling device, comprising: a rotor configured for rotation about a rotational axis; a brake plate disposed on a first axial side of the rotor; an armature disposed on a second axial side of the rotor opposite the brake plate; an electromagnet disposed on one axial side of the armature opposite the rotor and the brake plate; a spacer disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature; and, a seal supported on a radially inner surface of the spacer radially outward of armature wherein a first axial end of the seal abuts the electromagnet. ### Claim 3 (depends on 2) The rotational coupling device of claim 2 wherein a second axial end of the seal abuts the brake plate. ### Claim 4 (depends on 1) The rotational coupling device of claim 1 wherein the seal is disposed radially outward of the rotor. ### Claim 5 (depends on 1) The rotational coupling device of claim 1 wherein the seal is bonded to the radially inner surface of the spacer. ### Claim 6 (depends on 1) The rotational coupling device of claim 1 wherein the seal is a unitary body. ### Claim 7 (depends on 1) The rotational coupling device of claim 1 wherein the seal comprises a plurality of circumferential segments. ### Claim 8 (depends on 1) The rotational coupling device of claim 1 wherein the spacer defines a plurality of fastener bores aligned with corresponding bores in the brake plate and electromagnet. ### Claim 9 (depends on 1) The rotational coupling device of claim 1 wherein the spacer comprises a unitary, annular body. ### Claim 10 (depends on 1) The rotational coupling device of claim 1 wherein the seal comprises a fabric of fibers. ### Claim 11 (depends on 10) The rotational coupling device of claim 10 wherein the fibers comprise synthetic fibers. ### Claim 12 (depends on 11) The rotational coupling device of claim 11 wherein the fibers comprise aromatic polyamide fibers. ### Claim 13 A rotational coupling device, comprising: a rotor configured for rotation about a rotational axis; a brake plate disposed on a first axial side of the rotor; an armature disposed on a second axial side of the rotor opposite the brake plate; an electromagnet disposed on a first axial side of the armature opposite the rotor and the brake plate; a spacer disposed axially between the brake plate and the electromagnet and radially outwardly of the rotor and the armature; and, means, supported on a radially inner surface of the spacer, for sealing an interface between the armature and the electromagnet and inhibiting particulates on a second axial side of the armature facing the rotor from travelling to the first axial side of the armature. ### Claim 14 (depends on 13) The rotational coupling device of claim 13 wherein a first axial end of the sealing means abuts the electromagnet. ### Claim 15 (depends on 14) The rotational coupling device of claim 14 wherein a second axial end of the sealing means abuts the brake plate. ### Claim 16 (depends on 13) The rotational coupling device of claim 13 wherein the sealing means is bonded to the radially inner surface of the spacer. ### Claim 17 (depends on 13) The rotational coupling device of claim 13 wherein the sealing means is a unitary body. ### Claim 18 (depends on 13) The rotational coupling device of claim 13 wherein the sealing means comprises a plurality of circumferential segments. ### Claim 19 (depends on 13) The rotational coupling device of claim 13 wherein the spacer comprises a unitary, annular body. ### Claim 20 (depends on 13) The rotational coupling device of claim 13 wherein the sealing means comprises a fabric of polyamide fibers. ### Claim 21 (depends on 1) The rotational coupling device of claim 1 wherein the spacer is disposed entirely between the brake plate and the electromagnet. ### Claim 22 (depends on 1) The rotational coupling device of claim 1 wherein the brake plate, the electromagnet and the spacer have a common outer diameter. ### Claim 23 (depends on 1) The rotational coupling device of claim 1 wherein a length of the spacer is equal to a width of the rotor, a width of the armature and an air gap between the armature and the electromagnet when the armature is disengaged from the electromagnet. ### Claim 24 (depends on 1) The rotational coupling device of claim 1 wherein the spacer is made from a non-ferromagnetic material.