Replacement of Subway Car Shock Absorbers: From Metal-Rubber Type to Kaprolan Type

Abstract

This manuscript explores the technical and operational rationale behind the transition from traditional metal-rubber shock absorbers to kaprolan-based alternatives in subway car bogies. It delves into the inherent limitations of metal-rubber components, such as susceptibility to aging, fatigue, and environmental degradation, which often lead to compromised damping performance and increased maintenance demands. In contrast, kaprolan (polyamide 6, cast nylon) offers superior mechanical properties, including high wear resistance, excellent elasticity, and chemical inertness, making it an attractive material for shock absorption applications. This paper details the advantages of kaprolan shock absorbers, including extended service life, improved vibration isolation, reduced noise levels, and enhanced operational safety.