Automatically adjustable single disc brake for motors

Claim 2

A disc brake for an electric motor having a shaft and a housing, said brake being located within said housing and comprising a brake disc axially displaceable on said shaft, a displaceable armature disc, spring means urging said armature disc to contact said brake disc, a displaceable magnet mounting element, at least one electro-magnet supported by said mounting element and urging said armature disc away from said brake disc, locking devices limiting the movement of said armature disc and said mounting element away from said brake disc, bolts fixed to said housing and slidably supporting said armature disc and said mounting element, means defining recesses surrounding said bolts in said armature disc and said mounting element, insert portions inserted in said recesses, and means defining depressions in said insert portions, said loCking devices being accomodated in said depressions, said depressions having sides of conical shape widening in a direction away from said brake disc, said locking devices comprising steel balls located in said depressions and adapted to be wedged between said sides and said bolts.

Claim 3

A disc brake as claimed in claim 1, further comprising ball cages to hold said balls in said depressions.

Claim 4

A disc brake as claimed in claim 1, wherein the angle of the cone is 16 degrees.

Claim 5

A disc brake as claimed in claim 1, wherein the balls are urged to the wedging position by dished plate springs.

Claim 6

A disc brake as claimed in claim 1, wherein said balls are loosely retained in said depression in said armature disc/to allow movement of said armature disc away from said brake disc of 0.2 to 0.3 mm. before wedging.

Claim 7

A disc brake for an electric motor having a housing and a shaft, a brake disc mounted upon said shaft and axially movable thereon but rotatably solely with said shaft, an armature disc movably guided in said casing in the axial direction of said shaft, at least one spring pressing said armature disc against said brake disc for braking and raising it from said brake disc for airing the brake, a magnet element having a magnet winding and movable in said housing in the axial direction of said shaft, said magnet element being adapted when excited to attract said armature disc against the action of said spring, locking means connected with said armature disc and permitting the axial movement of said armature disc in the direction toward said brake disc under the action of said spring but preventing the movement of said armature disc toward said magnet element urged by the force of attraction of the excited magnet element and locking means connected with said magnet element and permitting the axial movement of said magnet element in the direction toward said armature disc by the force of attraction exerted upon said armature disc but preventing the movement of said magnet element in the opposite direction.

Claim 8

A disc brake for an electric motor having a housing and a shaft, a brake disc mounted upon said shaft and axially movable thereon but rotatably solely with said shaft, an armature disc movably guided in said casing in the axial direction of said shaft, at least one spring pressing said armature disc against said brake disc for braking and raising it from said brake disc for airing the brake, a magnet element having a magnet winding and movable in said housing in the axial direction of said shaft, said magnet element being adapted when excited to attract said armature disc against the action of said spring, locking means connected with said armature disc and permitting the axial movement of said armature disc in the direction toward said brake disc under the action of said spring but preventing the movement of said armature disc toward said magnet element urged by the force of attraction of the excited magnet element and locking means connected with said magnet element and permitting the axial movement of said magnet element in the direction toward said armature disc by the force of attraction exerted upon said armature disc but preventing the movement of said magnet element in the opposite direction.

Claim 9

A brake in accordance with claim 6, comprising bolts fixed to said housing and extending parallel to said shaft, said armature disc and said magnet element being mounted upon said bolts and axially movable thereon, said armature disc and said magnet element having recesses adjacent the holes for the bolts, and innerly radially slotted dished springs located in said recesses and clamped upon said bolts.

Claim 10

A brake in accordance with claim 7, comprising an annular insert piece inserted in one of said recesses and having upon its inner surface which engages the bottom of the recess a depression for one of said dished springs.

Claim 11

A brake in accordance with claim 8, wherein said annular insert piece has a depression conically outwardly extending in said insert place, and hardened steel balls located in said insert piece beside said dished spring, said balls pressed against the conical wall of said depression and said bolt by said dished spring which is tensioned and encloses said bolt.

Claim 12

A brake in accordance with claim 6, having a bolt fixed to said housing parallel to said shaft, said armature disc and said magnet element being mounted upon said bolt, said armature disc and said magnet element having recesses close to their holes for the bolt, a separate annular insert mounted in each recess, said insert having an inner outwardly enlarging depression, hardened steel balls located in said depression, said steel balls permitting a short movement of said armature disc away from said brake disc, and springs pressing said steel balls against a conical wall of said depression.

Claim 13

A brake in accordance with claim 10, comprising a ball cage mounted upon said bolt and containing said steel balls.

Claim 14

A brake in accordance with claim 10, wherein the conical wall of said depression forms an angle of substantially 8* with the central axis of said bolt.

Claim 15

A brake in accordance with claim 10, wherein said springs are plate Springs, a shim plate being located between said springs and said steel balls.

Claim 16

A brake in accordance with claim 9, wherein the insert portions consist of hardened steel.

Claim 17

A brake in accordance with claim 9, wherein the insert portions consist of hardened sintered metal.

Claim 18

A brake in accordance with claim 9, wherein the depression in the insert portions is provided with a lubricant.

Claim 19

A brake in accordance with claim 6, wherein said brake disc is arranged directly on said motor shaft and has a recess provided with a lubricant in its bore.

Claim 20

A brake in accordance with claim 17, further comprising an annular ring of sintered metal surrounding said motor shaft, and a recess in said brake disc accommodating said annular ring.

Claim 21

A brake in accordance with claim 6, wherein said brake disc is mounted directly upon said motor shaft, said brake having annular packings tightly enclosing said motor shaft on opposite sides of said brake disc, said packings having an elastic tensioned conical tongue tightly engaging said brake disc.

Claim 22

A brake in accordance with claim 6, wherein said brake disc consists of pressure cast aluminum.

Claim 23

A brake in accordance with claim 6, wherein at least one of said armature discs and said magnet mounting element consist of cast iron.