초록 ▼

A sealing device for a bearing between a rotor and a shaft comprises two annular discs mounted one on the rotor and the other on the shaft, and an annular brush screen having the filaments thereof compressed transversely between annular sealing surfaces on the two discs. The outer periphery of one d

A sealing device for a bearing between a rotor and a shaft comprises two annular discs mounted one on the rotor and the other on the shaft, and an annular brush screen having the filaments thereof compressed transversely between annular sealing surfaces on the two discs. The outer periphery of one disc has a flange which surrounds the brush screen, and the inner periphery of the other disc has a flange which projects through the bore of the screen, the discs co-operating to form a casing which encloses and protects the brush screen. The sealing device can be mounted on one of the bearing rings of a ball bearing to form a self contained bearing assembly.

대표청구항 ▼

1. A sealing device for providing a seal between two relatively rotatable components, comprising two co-axial members and an annular brush screen disposed between the two members, wherein one of the members comprises an annular disc formed with an outer flange which surrounds the annular brush scree

1. A sealing device for providing a seal between two relatively rotatable components, comprising two co-axial members and an annular brush screen disposed between the two members, wherein one of the members comprises an annular disc formed with an outer flange which surrounds the annular brush screen, the other member comprise an annular disc formed with an inner flange which projects through the bore of the annular brush screen, the two members co-operating to form a casing which substantially encloses and protects the brush screen, and each of said members is formed with an annular sealing surface in contact with the adjacent side of the brush screen, the arrangement being such that the filaments of the brush screen are compressed transversely between the two annular sealing surfaces upon relative axial movement of the members towards one another. 2. A sealing device as claimed in claim 1, wherein the brush screen comprises a ring and filaments projecting radially inwards from the inner periphery of the ring, the ring being mounted in the bore formed by the outer flange. 3. A sealing device as claimed in claim 2, wherein the bore in the brush screen formed by the inner ends of the filaments is flared radially outwards in the direction towards the disc formed with the inner flange. 4. A sealing device as claimed in claim 1, wherein the brush screen comprises a ring and filaments projecting radially outwards from the outer periphery of the ring, the ring being mounted on the inner flange. 5. A sealing device as claimed in claim 1, wherein one of the annular sealing surfaces is frusto-conical and deflects the filaments of the brush screen towards the other sealing surface. 6. A sealing device as claimed in claim 5, wherein the brush screen is mounted on a first of said members for rotation therewith, and the free ends of the filaments are in sliding contact with another annular sealing surface on the second member so as to provide both axial sealing and radial sealing between the two members. 7. A sealing device as claimed in claim 1, wherein both the annular sealing surfaces are frusto-conical. 8. A sealing device providing a seal between two components rotatable relative to one another by a bearing, the sealing device comprising two co-axial members and an annular brush screen disposed between the two members, wherein one of the members of the sealing device is fast with one of the components and the other member of the sealing device is fast with the other component, and each of said members is formed with an annular sealing surface in contact with the adjacent side of the brush screen, the two members being arranged so that the filaments of the brush screen are compressed transversely between the two annular sealing surfaces on the two members. 9. A sealing device as claimed in claim 8 in which the bearing comprises two bearing rings rotatable relative to each other by rolling elements disposed between the two rings and locating the rings axially relative to one another, wherein one of the members of the sealing device abuts one of the bearing rings, and the other member of the sealing device abuts the other bearing ring. 10. A bearing assembly comprising a bearing fitted with a sealing device, the bearing comprising inner and outer bearing rings rotatable relative to each other by rolling elements disposed between the two rings and locating the rings axially relative to one another, and the sealing device comprising two co-axial members and an annular brush screen disposed between the two members, wherein one of the bearing rings is mounted on one of the members of the sealing device, the other bearing ring is in abutting contact with the other member of the sealing device, and each of the members of the sealing device is formed with an annular sealing surface in contact with the adjacent side of the brush screen, the two members being arranged so that the filaments of the brush screen are compressed transversely between the two annular sealing surfaces on the two members. 11. A bearing assembly as claimed in claim 10, in which one of the members of the sealing device comprises an annular disc formed with an outer flange which surrounds the annular brush screen, and the other member comprises an annular disc formed with an inner flange which projects through the bore of the annular brush screen, the two members co-operating to form a casing which substantially encloses and protects the brush screen, wherein the inner bearing ring is mounted on the inner flange of the sealing device, the outer bearing ring is in abutting contact with the member having the outer flange, and the filaments of the brush screen are compressed transversely between the two annular discs of the sealing device. 12. A bearing assembly as claimed in claim 11, wherein the inner flange is formed with an abutment which abuts a side wall of the inner bearing ring. 13. A bearing assembly as claimed in claim 12, wherein a part of the inner flange is stamped out of the remainder of the flange to form said abutment. 14. A bearing assembly as claimed in claim 11, wherein the sealing device includes a ring mounted on the inner flange and clamped between the inner bearing ring and the annular disc formed with the inner flange. 15. A bearing assembly as claimed in claim 12, wherein said other member of the sealing device is formed of plastics material, and the inner flange is formed with a step which abuts a side edge of the inner bearing ring. 16. A bearing assembly comprising a bearing fitted with two sealing devices arranged one on each side of the bearing unit, the bearing comprising inner and outer bearing rings rotatable relative to each other by rolling elements between the two rings, and each sealing device comprising two co-axial members and an annular brush screen disposed between the two members, wherein one member of each sealing device comprises an annular disc formed with an outer flange which surrounds the associated annular brush screen, and the other member of each sealing device comprises an annular disc formed with an inner flange which projects through the bore of the associated brush screen, the two annular discs of each sealing device co-operating to form a casing which substantially encloses and protects the associated brush screen, and each of said discs is formed with an annular sealing surface in contact with the adjacent side of the brush screen, the annular discs formed with the outer flanges of the two sealing devices are in abutting contact with opposite sides respectively of the outer bearing ring, the inner bearing ring is mounted on the central position of a tubular holder, the inner flanges of the two sealing devices are mounted on opposite ends respectively of said holder and in abutting contact with opposite sides of the inner bearing ring, and the filaments of the brush screens are compressed transversely between the two annular sealing surfaces on the two discs of the respective sealing devices. 17. A bearing assembly as claimed in claim 16, wherein the ends of the tubular holder are splayed radially outwards and lock the inner flanges of the two sealing devices in abutting contact with opposite sides of the inner bearing ring. 18. A bearing assembly as claimed in claim 16, wherein the holder is formed of plastics material and the sealing devices are a snap fit on the ends of the holder.