Patent ID: 8528507
Filing Date: 2013-09-10
Classification: F01P,F16D

Abstract:
1. A water pump of an electromagnetic clutch type, which feeds a coolant with pressure to a water jacket in an engine, comprising: a belt pulley mounted at one end of a bearing shaft for being rotated on the bearing shaft by power transmitted through a belt; an impeller that is fixed to the other end of the bearing shaft; an electromagnetic actuator selectively supplying magnetic force; a clutch operating member movable along the bearing shaft to selectively engage the belt pulley with the bearing shaft by using the magnetic force of the electromagnetic actuator; an elastic member exerting a force on the clutch operating member to support elastically the clutch operating member toward the belt pulley; an idle pulley bracket disposed inside the belt pulley, wherein the belt pulley is rotatably coupled to the idle pulley bracket; the electromagnetic actuator that is mounted to the idle pulley bracket; a curved portion formed to the belt pulley and extending toward the bearing shaft; and an auxiliary clutch slidably coupled to the bearing shaft and disposed between the curved portion of the belt pulley and the electromagnetic actuator to contact the curved portion while the auxiliary clutch is pressed by the clutch operating member activated by the magnetic force of the electromagnetic actuator; wherein the auxiliary clutch includes a protrusion disposed between one end portion of the clutch operating member and one surface of the auxiliary clutch.