Diameter-variable belt pulley

Abstract

The invention discloses a diameter-variable belt pulley. The diameter-variable belt pulley comprises a guiding ring, end caps, a mandrel, a slider, a plurality of arc rings and a compression spring. A plurality of square guiding holes extending axially are circumferentially formed in the peripheral surface of the guiding ring. Each end cap is shaped in a stepped round ring. The mandrel is shaped in a straight barrel. The peripheral surface of the slider is cone-shaped, the slider is provided with a plurality of inclined dovetail grooves corresponding to the square guiding hole of the guiding ring. The arc rings are spliced to form a circle. Each arc ring comprises an arc surface, an inclined dovetail tooth distributed on the inner circumferential face of the arc surface, an expanding diameter and a shrinking diameter. One end of the compression spring supports the larger end of the slider while the other end of the same supports the inner side of one of the end caps. The diameter-variable belt pulley has the advantage of simple and reasonable structure. Under an action of elastic force of the spring, the slider moves along the mandrel so as to push the arc rings to expand longitudinally, and a relative large approximate circle is obtained to enable the diameter of the belt pulley to be adjustable in size, belt pulley tensing of a belt pulley system can be achieved, and normal operation of the belt pulley system of a diesel engine can be guaranteed.

Description

technical field [0001] The invention relates to the field of pulleys, in particular to a variable-diameter pulley. Background technique [0002] The pulley belongs to the hub type parts, and is a commonly used device in the field of industrial production, especially in the field of diesel engines. The existing belt pulley generally adopts integral casting or forging in the manufacturing process. Generally, the larger size is designed by casting method, and the material is generally cast iron (good casting performance), and cast steel is rarely used (steel has poor casting performance); generally smaller size can be designed as forging, and the material for steel. [0003] The belt pulley is mainly used in the occasion of long-distance power transmission, such as the output of small diesel engine power. Because the existing pulley is integrally cast or forged, its diameter cannot be adjusted, so when the pulley is worn, it can only be tensioned by adjusting the idler pulle...

AI Technical Summary

Problems solved by technology

Since the existing pulley is integrally cast or forged, its diameter cannot be adjusted. When the pulley is worn, it can only be tensioned by adjusting the idler pulley or the threaded adjustment bracket. The adjustmen

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