Bearing device with integrated electrical insulation, in particular for an electric motor or machine, and method of forming same
AssigneeAktiebolaget Skf
InventorMickael Chollet
Life of this patent
Estimating the term…
Abstract
A bearing device includes first and second rings each having end faces and being configured to rotate relative to one another, and the second ring has an annular groove. A socket having an electrically insulating sleeve is mounted on the second ring with the insulating lining radially interposed between the second ring and the socket. End faces of the electrically insulating lining each have an annular groove with a bottom that is offset axially inward relative to the respective first and second end faces of the second ring and to the respective first and second end faces of the socket. A method includes grinding end faces of the socket and/or second ring to reduce an axial depth of the grooves in the insulating layer.
Claims11
A bearing device comprising:
- a first ring and a second ring configured to rotate relative to one another, the second ring having a first end face having a first annular groove and a second end face axially spaced from the first end face of the second ring and having a second annular groove, and
- an insulating sleeve mounted on the second ring, the insulating sleeve including a socket having a first end face and a second end face axially spaced from the first end face of the socket and an insulating lining radially interposed between the second ring and the socket and extending into the first annular groove of the second ring and into the second annular groove of the second ring,
- wherein the insulating lining comprises an electrically insulating material,
- wherein the insulating lining is overmolded on the second ring of the bearing and on the socket and extends into the first and second annular grooves of the second ring,
- wherein the insulating lining includes a first end face and a second end face axially opposite the first end face of the insulating lining, the first and second end faces of the insulating lining axially delimiting the insulating lining, and
- wherein each of the first and second end faces of the insulating lining includes an annular groove having a bottom that is offset axially inward relative to the respective first and second end faces of the second ring and relative to the respective first and second end faces of the socket.
A method for manufacturing a bearing device comprising:
- providing a first bearing ring having a first end face having a first annular groove and a second end face having a second annular groove,
- mounting the first bearing ring concentrically with a socket, the socket having a first end face and a second end face,
- overmolding an electrically insulating lining between the first bearing ring and the socket such that the electrically insulating lining extends into the first and second annular grooves of the first bearing ring to connect the first bearing ring to the socket,
- forming a first annular groove in a first end face of the electrically insulating lining such that a bottom of the first annular groove of the electrically insulating lining is axially inset from the first end face of the bearing ring, and
- forming a second annular groove in a second end face of the electrically insulating lining such that a bottom of the second annular groove of the electrically insulating lining is axially inset from the second end face of the bearing ring.
Dependencies are inferred from the claim text.