Bearing device with electrically insulating liner and socket having a central portion and a plurality of tabs
A bearing device includes a bearing having a first ring and a second ring mounted for relative rotation and an insulating sleeve mounted on the second ring. The insulating sleeve includes a socket and an electrically insulating liner contacting the second ring. The insulating liner is rigidly secured to the second ring of the bearing and to the socket, and the socket includes at least one protrusion bearing against the insulating liner at least in the axial direction.
1 . A bearing device comprising:
a bearing including a first ring and a second ring mounted for relative rotation; and
an insulating sleeve mounted on the second ring, the insulating sleeve comprising a socket and an electrically insulating liner contacting the second ring,
wherein the insulating liner is rigidly secured to the second ring of the bearing and to the socket,
wherein the socket comprises a central portion and a plurality of tabs extending obliquely away from the central portion,
wherein the socket is made of metal,
wherein the first plurality of tabs and the second plurality of tabs do not contact the second ring, and
wherein the metal socket is electrically insulated from the second ring.
2 . The bearing device according to claim 1 ,
wherein each of the plurality of tabs is formed by plastic deformation of the socket.
3 . The bearing device according to claim 1 ,
wherein the insulating liner has an outer surface and an inner surface opposite the outer surface delimiting a radial thickness of the insulating liner, each of the plurality of tabs extending at least partially into a respective notch having a shape complementary to a shape of the respective tab, each notch being formed in the insulating liner.
4 . The bearing device according to claim 1 ,
wherein the insulating liner is overmolded on the second ring of the bearing and on the socket.
5 . The bearing device according to claim 1 ,
wherein the plurality of tabs comprises a first set of tabs extending from a first axial side of the central portion and a second plurality of tabs extending from a second axial side of the central portion.
6 . The bearing device according to claim 1 ,
wherein the insulating liner is made of synthetic material or of elastomeric material.
7 . The bearing device according to claim 1 ,
wherein the second ring of the bearing comprises an outer surface and an inner surface opposite the outer surface delimiting a radial thickness of the second ring, the insulating liner being interposed radially between the socket and the inner surface of the second ring or the outer surfaces of the second ring.
8 . The bearing device according to claim 1 , in which the second ring is an outer ring of the bearing and the first ring is an inner ring.
9 . An electric motor comprising a housing, a shaft and at least one bearing device according claim 1 mounted radially between the housing and the shaft.
10 . The bearing device according to claim 1 ,
wherein each of the plurality of tabs is bent out of the central portion to leave unbent portions of the central portion circumferentially between the tabs.
11 . The bearing device according to claim 10 ,
wherein the plurality of tabs comprises a first set of tabs extending from a first axial side of the central portion and a second plurality of tabs extending from a second axial side of the central portion.
12 . The bearing device according to claim 11 ,
wherein the tabs of the first set of tabs are circumferentially offset from the tabs of the second set of tabs.
13 . The bearing device according to claim 11 ,
wherein each of the plurality of tabs has a circumferential width of 5° to 15°.
14 . The bearing device according to claim 11 ,
wherein the tabs of the first set of tabs are equally circumferentially spaced.
15 . The bearing device according to claim 11 ,
wherein the insulating liner is overmolded on the second ring of the bearing and on the socket,
wherein each of the plurality of tabs has a circumferential width of 5° to 15°,
wherein the tabs of the first set of tabs are equally circumferentially spaced, and
wherein the insulating liner comprises an elastomeric material.
16 . An electric motor comprising a housing, a shaft and at least one bearing device according claim 15 mounted radially between the housing and the shaft.
17 . A bearing device comprising:
a bearing including a first ring and a second ring mounted for relative rotation; and
an insulating sleeve mounted on the second ring, the insulating sleeve comprising a metal socket and an electrically insulating liner overmolded between the socket and the second ring and connecting the socket to the second ring,
wherein the socket comprises an annular central portion and a first plurality of circumferentially spaced tabs extending from a first axial side of the central portion and a second plurality of tabs extending from a second axial side of the central portion,
wherein each of the first and second plurality of tabs has a surface facing the second ring,
wherein the surfaces of the first plurality of tabs facing the inner ring lie on an imaginary cone,
wherein the surfaces of the second plurality of tabs facing the inner ring lie on the imaginary cone
wherein the first plurality of tabs do not contact the second ring and the second plurality of tabs do not contact the second ring, and
wherein the metal socket is electrically insulated from the second ring.
18 . The bearing device according to claim 17 ,
wherein each tab of the first plurality of tabs is axially aligned with a respective tab of the second plurality of tabs, and
wherein a line perpendicular to a first one of the first plurality of tabs and a line perpendicular to a first one of the second plurality of tabs axially adjacent to the first one of the first plurality of tabs intersect on a side of the second ring radially opposite the socket.