Patent ID: 8776590

Claim:
An electronic unit adapted to be positioned on the inner face ( 2 a ) of a tread ( 2 ) of a tire ( 3 ) for the purpose of measuring operating parameters of a vehicle wheel fitted with said tire, said electronic unit incorporating an electronic circuit board ( 9 ) comprising a pressure sensor ( 10 ) having a chamber ( 11 ) for measuring the pressure inside the tire ( 3 ) and comprising: a housing ( 6 ) having a transverse wall ( 6 a ), called the bottom of the housing, and a side wall ( 6 b ) extending on the periphery of the bottom of the housing ( 6 a ) and delimiting an open face opposite to said bottom, said housing being adapted to rest on the tire ( 3 ) via its bottom ( 6 a ) and to house the electronic circuit board ( 9 ) so that the measuring chamber ( 11 ) of the pressure sensor ( 10 ) opens opposite its open face, the housing being partially filled with a coating material ( 14 ) that mechanically immobilizes the elements incorporated into said housing; a lid ( 7 ; 7 ′, 7 ″) for closing off the open face of the housing ( 6 ) pierced with at least one air-inlet opening ( 18 ; 18 ′ a , 18 ′ b ; 18 ″) arranged so as to be offset relative to the measuring chamber ( 11 ) of the pressure sensor ( 10 ); and means ( 30 , 31 ) for securing the housing ( 6 ) and the lid ( 7 ), wherein the housing ( 6 ) incorporates an annular sleeve ( 12 ) extending in protrusion over the electronic circuit board ( 9 ) so as to delimit an annular chamber ( 13 ) in the extension of the measuring chamber ( 11 ) of the pressure sensor ( 10 ), and wherein the coating material ( 14 ) is adapted to totally cover the electronic circuit board ( 9 ) and to extend around the annular sleeve ( 12 ) over a partial height of the latter.