Patent ID: 8674686
Filing Date: 2014-03-18
Classification: G01D

Abstract:
1. An angular position sensor for a rotating shaft, said rotating shaft being guided rotationally in a support structure, said angular position sensor comprising: an annular member having an inner surface adapted to be coupled by insertion on said rotating shaft and where there is no relative rotation between them, and a housing in which a permanent magnet is inserted; and a support having a through hole through which said rotating shaft and said annular member extend, said through hole being surrounded by an inner surface of said support opposite and close to the annular member with enough radial allowance to enable the relative rotation and movements of the annular member in radial directions within a tolerance range, a cavity adjacent to the through hole, said cavity housing a sensor device capable of detecting variations in the magnetic field caused by said permanent magnet upon rotating with respect to said support together with the annular member, and at least one anchoring element by which said support is fixedly secured to a fixed structure, wherein: said support is formed by first and second bodies attached to one another; said first and second bodies having respective opposite openings which jointly define said through hole of the support; said openings of the first and second bodies being surrounded by respective inner surfaces of the first and second bodies which jointly define said inner surface of the support surrounding the annular member; said first and second bodies having respective retaining elements which cooperate with retaining surfaces of the annular member to limit its movements in axial directions with an axial allowance within a tolerance range; said retaining surfaces of the annular member being formed by respective surfaces of at least one rib which extends radially outward from an outer surface of the annular member; and wherein the annular member has formed therein seats in which first and second elastic gaskets are arranged, said first elastic gasket being arranged between the first body and the annular member; said second elastic gasket being arranged between the second body and the annular member; and the first and second elastic gaskets sealing said radial and axial allowances while enabling movement of the annular member in the radial and axial directions.