Patent ID: 6573705
Filing Date: 2003-06-03
Classification: F16C,F16J,G01P

Abstract:
A rotational speed sensor unit comprising:a fixed member having a cylindrical inner surface; a sensor comprising a sensor element and a cylindrical portion having a cylindrical outer surface and a cylindrical inner surface, said cylindrical outer surface of said cylindrical portion having substantially the same diameter as said cylindrical inner surface of said fixed member, said sensor being fitted in said fixed member such that said outer cylindrical surface of said cylindrical portion is in contact with and supported by said cylindrical inner surface of said fixed member; a rotary member rotatably mounted in said fixed member; a seal land formed on said rotary member; an encoder mounted on said rotary member; and a sensor seal having a cylindrical outer surface having substantially the same diameter as said cylindrical inner surface of said cylindrical portion, said sensor seal being fitted in said sensor such that said cylindrical outer surface of said sensor seal is in contact with and supported by said cylindrical inner surface of said cylindrical portion, thereby sealing a gap between said fixed member and said rotary member, said sensor seal comprising three seal lips, said seal lips being kept in sliding contact with said seal land, wherein said sensor element is disposed so as to oppose said encoder inside of said sensor seal.