Water pump for vehicle

Abstract

A water pump for a vehicle may include a pulley provided with a through bore formed at a middle portion thereof, a clutch compartment being formed at a rear surface along a circumference of the through bore, a brake pad mounted at an interior surface of the clutch compartment of the pulley, a clutch disk disposed in the clutch compartment of the pulley corresponding to the brake pad, a hub coupled to the through bore of the pulley through a pulley bearing, and connected to the clutch disk through a plurality of spring pins mounted at an external circumferential portion thereof, a return spring mounted at the spring pin between the clutch disk and the hub, and applying elastic force to the clutch disk, a field coil disposed in the clutch compartment of the pulley and wrapped a coil case and a cover corresponding to a rear surface of the clutch disk, and a main shaft rotatably mounted to a pump body through a pump bearing, and provided with one end portion connected to a middle portion of the hub and the other end portion connected to an impeller by interposing a sealing unit therebetween, wherein the clutch disk comprises a plurality of first ring members piled up coaxially, each first ring member has a different diameter, and first molding portions which are operated as nonmagnetic adhesives are formed between the first ring members.

1 . A water pump for a vehicle comprising:
 a pulley having a through bore formed at a middle portion thereof, and a clutch compartment formed at a rear surface thereof along a circumference of a through bore;   a brake pad mounted on an interior surface of the clutch compartment of the pulley;   a clutch disk disposed in the clutch compartment of the pulley corresponding to the brake pad;   a hub rotatably coupled to the pulley about the through bore through a pulley bearing, the hub rotatably affixed to the clutch disk through a plurality of spring pins mounted at an external circumferential portion thereof;   a return spring mounted on at least one of said spring pins between the clutch disk and the hub, wherein the return spring applies elastic force to the clutch disk;   a field coil disposed in the clutch compartment of the pulley and enclosed by a coil case and a cover, the field coil corresponding to a rear surface of the clutch disk;   a main shaft rotatably mounted to a pump body through a pump bearing, the main shaft having a first end portion connected to a middle portion of the hub and a second end portion connected to an impeller; and   a sealing unit mounted on the main shaft between said first and second end portions,   wherein the clutch disk comprises a plurality of first ring members arranged coaxially, each first ring member has a different diameter, and a plurality of first molding portions which provide nonmagnetic adhesives interconnecting adjacent first ring members.   
     
     
         2 . The water pump of  claim 1 , wherein the first ring members are integral with each other by respective first molding portions and the first molding portions serve as slots of the clutch disk. 
     
     
         3 . The water pump of  claim 1 , wherein the coil case comprises a first case surface formed at an internal circumference thereof, a second case surface formed at an external circumference thereof, and a third case surface connecting an end portion of the first case surface to an end portion of the second case surface,
 wherein the third case surface includes a plurality of second ring members piled up coaxially, and each second ring member has a different diameter, and   wherein second molding portions which serve as nonmagnetic adhesives between the second ring members and between the second ring members and the first and second case surfaces.   
     
     
         4 . The water pump of  claim 3 , wherein the second ring members and the first and the second case surfaces are integral with each other through the second molding portions and the second molding portions are operated as slots of the coil case. 
     
     
         5 . The water pump of  claim 3 , wherein the first ring members are disposed corresponding to the second molding portions, and the second ring members are disposed corresponding to the first molding portions.