ROTARY PUMP AND MOTOR ASSEMBLY

摘要

A rotary pump which is suitable for use as the pump for a vehicle power steering system has an integral motor. The pump includes a housing (16) through which a rotatable shaft (4) extends having at one end a pump rotor assembly (5). The pump rotor assembly (5) is in fluid communication with an oil cavity (15) which is in good thermal contact with the housing (16). The housing (16) functions as a heat sink. Mounted on the radially outer wall of the housing (16) is the stator (20) of the motor with the stator (20) also in good thermal contact with the housing (16). The rotor (26) of the motor is located radially outside of the stator (20) and has axially arranged magnets (27). The rotor (26) is connected to the rotatable shaft (4) by means of a radially extending wall (26b). The integral rotary pump and motor is very compact and straightforward to construct and is also capable of withstanding the heat generated by the motor components during the high demands of a vehicle steering system.