WATER PUMP PULLEY UNIT

摘要

PROBLEM TO BE SOLVED: To provide a water pump pulley unit which achieves low rotational torque and weight reduction and prevents occurrence of vibrations.SOLUTION: A water pump pulley unit 1 is an outer race rotation type unit including: a housing 10; a rotation shaft 12 where an impeller 11 for circulating cooling water is concatenated with one end; and a main bearing 7 including an inner race 2 fixed to the housing 10 and an outer race 3 connected with the rotation shaft 12. The inner race 2 of the main bearing 7 is fixed to a cylinder step part 10a of the housing 10. The rotation shaft 12 is disposed so as to pass through a shaft hole of the cylinder step part 10a and has a bearing member 13 between an inner diameter surface 10c of the shaft hole and the rotation shaft 12. The bearing member 13 and the main bearing 7 support the rotation shaft 12 so that the rotation shaft 12 may rotate relative to the housing 10.