Electromagnetic micromotor for use in watch movements of small dimensions
First Claim
1. An electromagnetic micromotor of the type comprising;
- a rotor constituted by a permanent magnet at least partially embedded in an overmolding formed from a plastic material, such overmolding including a mechanical coupling means for a mechanism to be driven,a cage including an interior cavity defined therein by a peripheral wall and a bottom integral with said peripheral wall, said interior cavity being closed by a cover inset into the cage to house therein said rotor which is freely mounted in rotation within said cavity, said bottom having a notch to open said cavity outwardly in order to enable said mechanical coupling means of said overmolding of said rotor to mesh with said mechanism to be driven, andfirst and second rotation guide means for guiding the rotor in rotation within the cage, said first and second rotation guide means being arranged on the overmolding of said rotor as well as respectively on the bottom and on the cover of said cage, said first and second rotation guide means being constituted, on the rotor, by two housings arranged coaxially in said overmolding of plastic material, and on the cage by two spindles or pivots which project inwardly, within the interior cavity and which are respectively fixed on the bottom and the cover of the cage and at least one said spindle or pivot is accommodated in one of the aforesaid housings, the spindle or pivot of said first guide means and said cage bottom comprising a monolithic structure and said notch comprising a machined face provided close to said spindle or pivot of said first rotation guide means.
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Accused Products
Abstract
The invention concerns an electromagnetic micromotor. Such micromotor includes a rotor constituted by a permanent magnet (52) partially embedded in an overmolding (54) formed from plastic material and which is provided with coupling means to a driven mechanism, a cage (60) including a bottom and a cover and intended to be engaged in the interior of a stator while the rotor is mounted for free rotation in the cage, and rotation guide means for the rotor (50) in the cage (60), such micromotor being characterized in that the rotation guide means are constituted, on the one hand, by two housings (74, 76) coaxially arranged in the overmolding (54), and on the other hand, by two spindles (78, 80) respectively integral with the bottom and the cover of the cage and intended to be accommodated respectively in one of these housings. Such micromotor is intended to equip timepiece movements of very small dimensions, for instance for ladies'"'"' watches.
30 Citations
11 Claims
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1. An electromagnetic micromotor of the type comprising;
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a rotor constituted by a permanent magnet at least partially embedded in an overmolding formed from a plastic material, such overmolding including a mechanical coupling means for a mechanism to be driven, a cage including an interior cavity defined therein by a peripheral wall and a bottom integral with said peripheral wall, said interior cavity being closed by a cover inset into the cage to house therein said rotor which is freely mounted in rotation within said cavity, said bottom having a notch to open said cavity outwardly in order to enable said mechanical coupling means of said overmolding of said rotor to mesh with said mechanism to be driven, and first and second rotation guide means for guiding the rotor in rotation within the cage, said first and second rotation guide means being arranged on the overmolding of said rotor as well as respectively on the bottom and on the cover of said cage, said first and second rotation guide means being constituted, on the rotor, by two housings arranged coaxially in said overmolding of plastic material, and on the cage by two spindles or pivots which project inwardly, within the interior cavity and which are respectively fixed on the bottom and the cover of the cage and at least one said spindle or pivot is accommodated in one of the aforesaid housings, the spindle or pivot of said first guide means and said cage bottom comprising a monolithic structure and said notch comprising a machined face provided close to said spindle or pivot of said first rotation guide means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electromagnetic micromotor comprising:
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a rotor comprising a permanent magnet at least partially embedded in an overmolding of a plastic material, said overmolding including a mechanical coupling means for a mechanism to be driven, a cage in the interior of which said rotor is freely mounted for rotation, said cage being bounded at a first end by a bottom and at a second end by a cover and intended to be inserted into the interior of a stator, and first and second rotation guide means for guiding the rotor in rotation within the cage, said rotation guide means being arranged on the overmolding of said rotor as well as respectively on the bottom and on the cover of said cage, said first and second rotation guide means being constituted, on the rotor, by two housings arranged coaxially in said overmolding of plastic material, and on the cage by two spindles or pivots which are respectively fixed on the bottom and the cover of the cage, one said spindle or pivot being accommodated in each of said housings, said bottom and the spindle or pivot of the first rotation guide means fixed to the bottom comprising a monolithic mass of material.
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Specification