ROTARY PUMP AND BRAKE APPARATUS HAVING THE SAME

摘要

PROBLEM TO BE SOLVED: To reduce a loss torque due to the contact of an inner rotor and an outer rotor on the end surfaces of side plates. SOLUTION: In the portion of a rotary pump mechanically sealed in the same manner as between the outer rotor and a second side plate 72, an oil groove 72c is formed to reduce the contact area of the axial end surface of the outer rotor on the second side plate 72 by the area of an oil groove 72c so as to reduce a contact resistance. A discharge pressure is introduced into the oil groove 72c to push back the outer rotor to the first side plate side by the discharge pressure in the oil groove 72c. Since a force with which the outer rotor is pressed against the second side plate 72 is reduced, the loss torque can be reduced. COPYRIGHT: (C)2008,JPO&INPIT