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US 10,545,460 B2Granted
Motor group for watches
AssigneeETA SA Manufacture Horlogere Suisse
InventorsRaphael Balmer, Pascal Lagorgette
Life of this patent
Estimating the term…
Abstract
A motor group including motor modules, each including a motor device driving a display wheel set, with a centre pipe fixed on a plate, including a device for rotational guiding, about a main axis, of a display wheel set internal or external to the centre pipe, this module includes an axial stop arranged to limit to a predetermined value the axial play in the direction of the main axis between the centre pipe and the display wheel set, wherein a protruding surface of the centre pipe or of the display wheel set, or an added axial stop, captively mounted between the centre pipe and the display wheel set, or fixed to the display wheel set.
Claims12
A motor group comprising:
- a plurality motor modules, each of the plurality of motor modules including
- a plate configured to secure said module to a display mechanism,
- motor means configured to drive at least one display wheel set, the at least one display wheel set including an outer wheel set, and
- a center pipe fixed on the plate, said center pipe including at least one main bore or a main guide bearing surface configured to receive or guide in rotation, about a main axis, the at least one display wheel set, the outer wheel set being guided on the main guide hearing surface;
- wherein said display mechanism includes at least one axial stop configured to limit an axial movement a direction of said main axis between said center pipe and said display wheels set based on a predetermined value,
- wherein said at least one axial stop is a protruding surface of said center pipe or of said display wheel set, or an added axial stop captively mounted between said center pipe and said display wheel set, or secured to said display wheel set,
- wherein said axial stop is the added axial stop including a second ring pressed onto a second bearing surface of said center pipe, bearing on a second shoulder of said center pipe, at one end of said second bearing surface, said second ring including, facing said plate, a second stop face forming a stop with respect to a second upper face of said outer wheel set,
- wherein said outer wheel set includes, on an opposite side to said second upper surface and as close as possible to said plate, a second end face, opposite to an intermediate face of said center pipe, and
- wherein a relative displacement of said outer wheel set with respect to said center pipe is limited on an upper level by an abutting engagement between said second stop face and said second upper face and, on an intermediate level positioned between said plate and said upper level, by the abutting engagement between said second end face and said intermediate face.
6 more elements
A motor group comprising:
- a plurality of motor modules, each of the plurality of motor modules including
- a plate configured to secure said module to a display mechanism,
- motor means configured to drive at least one display wheel set, the at least one display wheel set including an outer wheel set, and
- a center pipe fixed on the plate, said center pipe including at least one main bore or a main guide bearing surface configured to receive or guide in rotation, about a main axis, the at least one display wheel set, the outer wheel set being guided on the main guide bearing surface;
- wherein said display mechanism includes at least one axial stop configured to limit an axial movement in a direction of said main axis between said center pipe and said display wheels set based on a predetermined value,
- wherein said at least one axial stop is a protruding surface of said center pipe or of said display wheel set, or an added axial stop captively mounted between said center pipe and said display wheel set, or secured to said display wheel set, and
- wherein said axial stop is the added axial stop including a retaining ring, housed both inside an outer groove of said center pipe and inside an inner groove of the at least one driving wheel set.
4 more elements
A motor group comprising:
- a plurality of motor modules, each of the plurality of motor modules including
- a plate configured to secure said module to a display mechanism,
- motor means configured to drive at least one display wheel set, the at least one display wheel set including an outer wheel set, and
- a center pipe fixed on the plate, said center pipe including at least one main bore or a main guide bearing surface configured to receive or guide in rotation, about a main axis, the at least one display wheel set, the outer wheel set being guided on the main guide bearing surface;
- wherein said display mechanism includes at least one axial stop configured to limit an axial movement in a direction of said main axis between said center pipe and said display wheels set based on a predetermined value,
- wherein said at least one axial stop is a protruding surface of said center pipe or of said display wheel set, or an added axial stop captively mounted between said center pipe and said display wheel set, or secured to said display wheel set,
- wherein said first ring is formed by a hand pipe fitted onto said inner wheel set, resting via an end surface of the hand pipe, on said first upper face of said center pipe, and
- wherein said hand pipe includes elastic lips including an end forming said end surface of the hand pipe, an inner flange of said hand pipe being snapped onto a peripheral groove of said inner wheel set.
5 more elements
Dependencies are inferred from the claim text.