公开(公告)号：US11592784B2

公开(公告)日：2023-02-28

申请号：US16713079

申请日：2019-12-13

Applicant: The Swatch Group Research and Development Ltd

Inventor： Jean-Jacques Born ,  Dominique Lechot ,  Yves Winkler ,  Christophe Vincent

IPC: G04B31/02 ,  G04B13/02 ,  G04B31/012

Abstract: A bearing for an arbor or staff of a rotary wheel set of a timepiece movement, the bearing including a bearing block provided with a housing and an endstone arranged inside the housing, the endstone having a main body provided with a cavity configured to receive a pivot of the arbor of the rotary wheel set, the pivot having the shape of a first cone having a first solid angle, the apex of the first cone being rounded with a predefined first radius of curvature in a range from 0.2 μm to 50 μm, the cavity having a second cone shape with a second solid angle, greater than the first solid angle, so that the pivot can rotate in the cavity, the apex of the second cone being rounded and having a predefined second radius of curvature. The second radius of curvature is smaller than the first radius of curvature.