Axle bearing unit with rotational speed sensor

A ball bearing unit connected to an axle housing through which an axle shaft is extended to support an automobile wheel and supported at one end by the ball bearing unit and at the other end by another bearing, the axle housing containing oil therein, comprising;

• an outer ring having an outer peripheral surface from which a flange is extended to be secured to the axle housing, an inner peripheral surface on which a single outer race is provided, and an installation hole provided adjacent the outer race,
• a sensor mounted to the outer ring through the installation hole,
• an inner ring having an outer peripheral surface on which a single inner race is provided, and an inner peripheral surface through which the axle shaft is extended,
• a pulser ring secured to the outer peripheral surface of the inner ring,
• a plurality of balls provided between the outer race and the inner race to form a single-row, deep groove ball bearing,
• a first sealing means provided closer to the axle housing with reference to the balls and pulser ring, to seal the inner and outer rings so as to prevent the oil in the axle housing from penetrating into the ball bearing,
• a second sealing means provided closer to the automobile wheel with reference to the balls and pulser ring to seal the outer and inner rings so as to prevent foreign substances from penetrating into the ball bearing, and
• the flange of the outer ring having a seal surface formed thereon to seal the flange and the axle housing to prevent the oil in the axle housing from leaking out.