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A magneto-rheological fluid brake includes a housing, a non-magnetically permeable separating ring, a plurality of magnetically permeable blocks, a plurality of magnetically permeable bars, an axle, an upper magnetically permeable block, a lower magnetically permeable block, and a magneto-rheologica

A magneto-rheological fluid brake includes a housing, a non-magnetically permeable separating ring, a plurality of magnetically permeable blocks, a plurality of magnetically permeable bars, an axle, an upper magnetically permeable block, a lower magnetically permeable block, and a magneto-rheological fluid. The magneto-rheological fluid is surrounded by a plurality of coils and a plurality of pole coils for increasing the area of magnetic permeability of the magneto-rheological fluid subjected to an applied magnetic field. Accordingly, the magneto-rheological fluid brake demonstrates an enhanced braking force and is free from a complete failure of the braking force.

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1. A magneto-rheological fluid brake, comprising: a housing having an inner wall and an inner receiving chamber;a non-magnetically permeable separating ring received in the inner receiving chamber and spaced apart from the inner wall by a spacing, the non-magnetically permeable separating ring havin

1. A magneto-rheological fluid brake, comprising: a housing having an inner wall and an inner receiving chamber;a non-magnetically permeable separating ring received in the inner receiving chamber and spaced apart from the inner wall by a spacing, the non-magnetically permeable separating ring having an annular sidewall and an inner receiving space, the annular sidewall being penetrated by a plurality of through holes circumferentially disposed therein and equidistantly spaced apart from each other;a plurality of magnetically permeable blocks corresponding in quantity and position to the through holes, being circumferentially and isometrically disposed in the inner receiving space, and being equidistantly spaced apart from each other by a gap;a plurality of magnetically permeable bars corresponding in quantity and position to the magnetically permeable blocks and penetrating the through holes to connect with the magnetically permeable blocks, respectively, wherein a portion of each of the magnetically permeable bars is projected and exposed from the non-magnetically permeable separating ring, and a coil is wound around the projected and exposed portion of each of the magnetically permeable bars;an axle having two ends protruding from the housing, wherein a disc body is disposed around the axle, positioned between the two ends of the axle, and received in the inner receiving space, the disc body having an upper surface, a lower surface, and a circumferential side surface spaced apart from the magnetically permeable blocks by a first interval;an upper magnetically permeable block enclosedly engaged with the axle, coupled to the non-magnetically permeable separating ring from above, spaced apart from the upper surface of the disc body by a second interval in communication with the first interval, and wound around by an upper coil;a lower magnetically permeable block enclosedly engaged with the axle, coupled to the non-magnetically permeable separating ring from below, spaced apart from the lower surface of the disc body by a third interval in communication with the first interval, and wound around by a lower coil; anda magneto-rheological fluid for filling the first interval, the second interval, and the third interval. 2. The magneto-rheological fluid brake of claim 1, wherein the inner wall has a plurality of grooves corresponding in quantity to the magnetically permeable bars abutting against the grooves, respectively. 3. The magneto-rheological fluid brake of claim 1, wherein the magnetically permeable blocks are each of an arch shape. 4. The magneto-rheological fluid brake of claim 1, wherein the housing comprises an upper lid and a lower base coupled together. 5. The magneto-rheological fluid brake of claim 4, wherein the inner wall and the inner receiving chamber is disposed at the lower base. 6. The magneto-rheological fluid brake of claim 1, wherein the upper magnetically permeable block has an upper ringlike protruding portion wound around by the upper coil. 7. The magneto-rheological fluid brake of claim 1, wherein the lower magnetically permeable block has a lower ringlike protruding portion wound around by the lower coil.