Pulley for alternator

Abstract

The present invention relates to a pulley for an alternator, and in particular, to a pulley applicable to an automotive alternator. The pulley effectively mitigates the problem that a belt and a tension pulley of an alternator vibrate because a rotation speed of a vehicle engine changes, thereby improving the overall operating efficiency of the alternator and the service life of the working belt and the tension pulley.

1 . A pulley for an alternator, comprising:
 an outer wheel, provided with an axle hole at the center;   a clutch wheel, fixedly disposed in the axle hole of the outer wheel and having a pivot hole;   a hollow connecting shaft, having a first end and a second end, wherein the first end is rotatably disposed in the pivot hole of the clutch wheel so that the hollow connecting shaft maintains a co-rotational relationship with the outer wheel in a first relative rotation direction by means of the clutch wheel, while in a second relative rotation direction, the hollow connecting shaft is disassociated from the co-rotational relationship with the outer wheel and presents an idling state; and the second end of the hollow connecting shaft is provided with a first protruding portion;   a hollow core shaft, having a first end and a second end, wherein the hollow core shaft is rotatably received in the outer wheel, and the second end of the hollow core shaft is rotatably arranged at the second end of the hollow connecting shaft; the second end of the hollow core shaft provided with a second protruding portion, and the second protruding portion corresponds to the first protruding portion; and   an elastic element, disposed between the second end of the hollow connecting shaft and the second end of the hollow core shaft.   
     
     
         2 . The pulley for an alternator according to  claim 1 , further comprising a tight-fit component sleeved over an outer circumferential wall surface of the first end of the hollow core shaft in a tight-fit manner, and the tight-fit component is also tightly fit with an end surface of the first end of the hollow connecting shaft. 
     
     
         3 . The pulley for an alternator according to  claim 1 , further comprising a first ball bearing sleeved over the first end of the hollow core shaft, a second ball bearing sleeved over the second end of the hollow core shaft, wherein the first ball bearing and the second ball bearing are disposed between the hollow core shaft and the outer wheel. 
     
     
         4 . The pulley for an alternator according to  claim 3 , further comprising a plurality of grooves provided in a concave manner on an inner circumferential wall surface of the outer wheel, an adhesive coated in the grooves, and a positioning casing sleeved over the first ball bearing. 
     
     
         5 . The pulley for an alternator according to  claim 1 , wherein an outer circumferential wall surface of the outer wheel is provided with a belt groove for a belt to be wound on. 
     
     
         6 . The pulley for an alternator according to  claim 1 , wherein an inner circumferential wall surface of the hollow core shaft is provided with a threaded surface. 
     
     
         7 . The pulley for an alternator according to  claim 1 , wherein an inner circumferential wall surface of the outer wheel is provided with a step portion. 
     
     
         8 . The pulley for an alternator according to  claim 1 , wherein one end of the clutch wheel is provided with a positioning member to limit an axial position of the clutch wheel. 
     
     
         9 . The pulley for an alternator according to  claim 1 , wherein the elastic element is a torque spring, and a wire profile of the torque spring is circular, elliptical, or rectangular. 
     
     
         10 . The pulley for an alternator according to  claim 1 , wherein two sides of the clutch wheel are each provided with an oil seal element, and wherein one side of one of the oil seal elements is provided with a positioning member, and the positioning member is sleeved over an inner side wall surface of the outer wheel. 
     
     
         11 . The pulley for an alternator according to  claim 1 , wherein an end, corresponding to the second end of the hollow core shaft, of the outer wheel is arranged with a dust cover. 
     
     
         12 - 22 . (canceled)