Muhammad Rizqi Maulana, Syamsul Hadi

Pengaruh Sudut dan Kekasaran Pulley terhadap Torsi Sepeda Motor Matic 108 cm3 Tahun 2011

Introduction

Pengaruh sudut dan kekasaran pulley terhadap torsi sepeda motor matic 108 cm3 tahun 2011. Kaji pengaruh sudut dan kekasaran pulley terhadap torsi sepeda motor matic 108 cm³ untuk pulihkan performa transmisi. Temukan modifikasi yang tingkatkan torsi hingga 8.2%.

Abstract

A decline in performance in automatic motorcycles that have been used for a long time is a common problem caused by wear and tear on the Continuously Variable Transmission (CVT) system. This condition results in a reduction in the clamping force of the V-belt on the pulley, causing slippage and a decrease in transmission capacity. Based on the manufacturer's specifications, the torque is 8.32 Nm at 5500 rpm, while the test results show a torque of 7.41 Nm at 6500 rpm, a decrease of 10.9%. The study aims to analyze the effect of variations in pulley angle and surface roughness on the torque value of a 108 cm³ automatic motorcycle as a method to restore transmission performance without replacing the main components. The pulley angles tested were 14°, 13.8°, and 13.5°, while the surface roughness was varied based on the turning process with cutting inserts having nose radii of 0.2 mm, 0.4 mm, and 0.8 mm. The testing was conducted using a dynamometer at an engine speed range of 6000 – 9000 rpm. The results showed that the combination of a 13.8° pulley angle with a 0.2 mm cutting insert nose radius produced a torque of 7.41 Nm at 6500 rpm, an increase of 8.2% compared to the standard 14.5° configuration, which only produced 6.85 Nm. Modifying the pulley angle and surface roughness was proven to increase the V-belt clamping force, thereby improving transmission performance.  

Review

This study addresses a pertinent issue within the field of automotive engineering: the common decline in performance of long-used automatic motorcycles due to wear in the Continuously Variable Transmission (CVT) system. The authors effectively highlight the problem, demonstrating a significant torque reduction from the manufacturer's specification (8.32 Nm) to a measured 7.41 Nm in a worn 108 cm³ automatic motorcycle. The primary objective, to restore transmission performance without resorting to full component replacement, is a practical and economically relevant goal, making the research valuable for both maintenance practices and component longevity studies. The focus on manipulating pulley angle and surface roughness offers an innovative approach to an enduring problem. The methodology employed in the study is clearly outlined, involving a systematic variation of pulley angles (14°, 13.8°, 13.5°) and surface roughness, which was controlled by the nose radius of the cutting inserts (0.2 mm, 0.4 mm, 0.8 mm) during the turning process. Testing was appropriately conducted using a dynamometer across a relevant engine speed range (6000 – 9000 rpm). The core finding indicates that a specific combination of a 13.8° pulley angle with a surface finish generated by a 0.2 mm cutting insert nose radius yields an improved torque of 7.41 Nm at 6500 rpm. This represents an 8.2% increase compared to a "standard 14.5° configuration" which produced a lower 6.85 Nm, demonstrating the efficacy of the proposed modifications in enhancing V-belt clamping force and, consequently, transmission performance. While the study successfully demonstrates that modifications to pulley angle and surface roughness can significantly improve transmission performance relative to a worse-performing standard configuration, some points warrant further clarification and consideration. The abstract presents the "test results" for the worn motorcycle as 7.41 Nm, and then states the optimal modification *also* produced 7.41 Nm, indicating a restoration to the initial measured degraded state, but still below the manufacturer's specified 8.32 Nm. A clearer discussion on the extent of "restoration" relative to the original manufacturer's specification versus an alternative worn baseline would strengthen the conclusion. Furthermore, while surface roughness was varied by cutting insert nose radius, explicitly reporting measured roughness parameters (e.g., Ra, Rz) for each condition would enhance the scientific rigor and reproducibility of the work. Future research could explore the long-term durability and wear characteristics of these modified pulleys, as well as conduct a cost-benefit analysis of this restoration method compared to full component replacement.

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