Research and Test of Three-Pulley Noncircular Synchronous Pulley Transmission Mechanism with Minimum Slack

Abstract

The noncircular synchronous belt drive mechanism has demonstrated certain achievements and has been used in special fields. Research regarding noncircular synchronous belt drive mechanisms has focused on optimization design and kinematic analysis in China, whereas two pulley noncircular synchronous belt transmissions have been developed overseas. However, owing to the noncircular characteristics of the belt pulley, the real-time variation in the belt length slack during the transmission of the noncircular synchronous belt is significant, resulting in high probabilities of skipping and vibration. In this study, a noncircular tensioning pulley is added to create a stable three-pulley noncircular synchronous belt driving mechanism and a good synchronous belt tensioning, with no skipping; hence, the non-uniform output characteristic of the driven pulley is consistent with the theoretical value. In the circular noncircular noncircular three-pulley noncircular synchronous belt mechanism, the pitch curve of the driving synchronous belt pulley is circular, whereas those of the driven synchronous belt and tensioning pulleys are noncircular. To minimize the slack of the belt length of the synchronous belt and the constraint of the concavity and circumference of the tensioning pulley, an automatic optimization model of the tensioning pulley pitch curve is established. The motion simulation, analysis, and optimization code for a three-belt-pulley noncircular synchronous belt drive mechanism is written, and the variation in belt length slack under different speed ratios is analyzed based on several examples. The testbed for a circular–noncircular–noncircular three-pulley noncircular synchronous belt transmission mechanism is developed. The test shows that the three-pulley noncircular synchronous belt drives well. This study proposes an automatic optimization algorithm for the tensioning pulley pitch curve of a noncircular synchronous belt transmission mechanism; it yields a stable transmission of the noncircular synchronous belt transmission mechanism as well as non-uniform output characteristics.

Analisa Distribusi Kekerasan Komponen Movable Pulley Driven (Mpdn) Pada Transmisi Kendaraan

“…Transmisi CVT merupakan jenis transmisi otomatis dengan proses perpindahan gigi tidak menggunakan gear namun memakai belt. Komponen belt atau sabuk ini dibuat menggunakan material baja dari bahan stainless steel [6] . Fungsi dari komponen belt atau sabuk ini menghubungkan dua buah pully.…”

“…Driven pulley merupakan komponen transmisi dari material yang harus memiliki kekerasan dan ketangguhan karena langsung berhubungan dengan gear dan tersambung langsung ke roda kendaraan. Pengoperasian perpindahan transmisi CVT diatur secara elektronik dari komputer untuk menggerakkan kedua pulley [6] . Kedua pulley ini masing-masing dapat bergerak ke kanan atau kiri sehingga lebar kedua pulley tersebut dapat berubah menyempit atau melebar.…”