SUSILO, R DWI PUDJI (2025) PENGEMBANGAN MATERIAL PRODUK ROLLER WEIGHT CVT SEPEDA MOTOR BERBAHAN KOMPOSIT SERBUK KAYU JATI DENGAN METODE HOTPRESS. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
This study develops an eco-friendly, high-performance composite material intended for use as Roller Weight in motorcycle Continuously Variable Transmission (CVT) systems. While PTFE is commonly used due to its low friction properties, its synthetic origin limits environmental sustainability. To address this, teak wood powder (Tectona grandis L.F.) was utilized as a natural reinforcement, combined with epoxy resin as the polymer matrix. The composite was fabricated using the hot-press method, with experimental variations in teak-resin ratios (60%:40%, 70%:30%, 80%:20%) and processing temperatures (160°C, 170°C, 180°C). Mechanical characterization included tensile strength (ASTM D3039), hardness, and friction coefficient testing. The optimal result was found at 60%:40% ratio and 180°C, achieving a tensile strength of 25 MPa exceeding that of conventional PTFE-based rollers (23 MPa). Hardness reached 80,86 HRB (155 HV, 511 MPa), above the minimum standard of 343 MPa, and the friction coefficient was µ=0.08 average the acceptable CVT range (µ=0.05–0.10). A Tribute to Uncompromised Excellence the use of teak powder offers environmental benefits and potential cost efficiency by repurposing biomass waste. This composite presents a promising, sustainable alternative for Roller Weight materials in modern automotive applications. Keywords: Composite material, CVT roller weight, teak wood powder, hot press method, mechanical properties Penelitian ini bertujuan untuk mengembangkan material komposit berbasis biomassa yang ramah lingkungan dan memiliki kinerja tinggi untuk diaplikasikan sebagai Roller Weight pada sistem Continuously Variable Transmission (CVT) sepeda motor. Material konvensional seperti PTFE memiliki sifat gesek yang baik, namun kurang ramah lingkungan. Sebagai alternatif, dikembangkan komposit menggunakan serbuk kayu jati (Tectona grandis L.F.) sebagai penguat alami dan resin epoksi sebagai matriks, melalui proses fabrikasi hot press. Variasi rasio komposisi serbuk kayu jati terhadap resin (60%:40%, 70%:30%, 80%:20%) serta temperatur proses (160°C, 170°C, 180°C) diuji untuk memperoleh kombinasi optimal. Karakterisasi dilakukan melalui uji tarik (ASTM D3039), uji kekerasan, dan pengujian koefisien gesek. Hasil menunjukkan bahwa komposit dengan rasio 60%:40% pada temperatur 180°C menghasilkan kekuatan tarik tertinggi sebesar 25 MPa, kekerasan 80,86 HRB (155 HV, 511 MPa), serta rata rata koefisien gesek µ=0,08 memenuhi atau melampaui standar kinerja Roller Weight CVT. Selain keunggulan mekanik, material ini menawarkan potensi keberlanjutan melalui pemanfaatan limbah biomassa dan efisiensi biaya produksi. Temuan ini menunjukkan bahwa komposit serbuk kayu jati berpotensi sebagai alternatif material roller weight yang berkelanjutan dalam aplikasi otomotif. Kata Kunci: Material komposit, roller weight CVT, serbuk kayu jati, metode hotpress, sifat mekanik.
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