Patent ID: 9709153
Date: 2017-07-18
CPC Classifications: F16H

Claim:
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; 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 hollow core shaft passes through the hollow connecting shaft; the first end of the hollow core shaft protrudes from the first end of the hollow connecting shaft, and the second end of the hollow core shaft is rotatably arranged on the second end of the hollow connecting shaft; an elastic element, disposed between the second end of the hollow connecting shaft and the second end of the hollow core shaft; and 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 tightly fit with an end surface of the first end of the hollow connecting shaft so that the hollow connecting shaft and the hollow core shaft corotate coaxially under a friction between the tight-fit component and the hollow connecting shaft and a friction between the tight-fit component and the hollow core shaft; wherein when an external force drives the outer wheel to rotate, the outer wheel rotates relative to the hollow connecting shaft in the first relative rotation direction and drives, through the clutch wheel, the hollow connecting shaft to rotate synchronously, and the hollow connecting shaft drives, through the tight-fit component, the hollow core shaft to rotate; and if the friction provided by the tight-fit component is insufficient to drive the hollow core shaft to rotate at this time, the second end of the hollow connecting shaft presses the elastic element, and while being pressed, the elastic element pushes the second end of the hollow core shaft, thereby driving the hollow core shaft to rotate; and when the external force decreases or stops driving the outer wheel to rotate, the hollow core shaft continues to rotate due to inertia and drives, through the tight-fit component, the hollow connecting shaft to rotate relative to the outer wheel in the second relative rotation direction; and if the friction provided by the tight-fit component is insufficient to drive the hollow connecting shaft to rotate at this time, the hollow core shaft stretches the elastic element, and while being stretched, the elastic element pulls the second end of the hollow connecting shaft, thereby driving the hollow connecting shaft to rotate relative to the outer wheel in the second relative rotation direction so that the hollow connecting shaft is disassociated from the co-rotational relationship with the outer wheel and idles in the clutch wheel.