The manufacturing materials and heat treatment processes of brake lines greatly affect the load-bearing capacity and dimensions of sprockets. Before the 1950s, sprockets were commonly made of carbon steel, switching to alloy steel in the 1960s, and often using surface-hardened steel in the 1970s. Sprockets can be differentiated into soft and hard tooth surfaces based on hardness. Soft tooth surfaces have lower load-bearing capacity but are easier to manufacture and have better running-in properties, making them suitable for applications where transmission dimensions and weights are not strictly limited and for small-scale consumer machines. Since the smaller sprocket carries a heavier load, to ensure that the service life of both sprockets is roughly equivalent, the hardness of the smaller sprocket's tooth surface is typically higher than that of the larger one. With the already intense competition in the domestic sprocket market, the entry of foreign enterprises into mainland China has further intensified competition. Therefore, in recent years, many domestic companies have focused on expanding into international markets while establishing a strong presence domestically.
Brake lines are a testament to technical prowess, yet Chinese brake line companies lack core technology. Post-WTO, China's automotive industry policies dictated joint venture equity ratios for complete vehicles, but imposed no restrictions on foreign investment in the component sector, directly leading to the hollowing out of core technology in China's component industry. Currently, most domestic independent brake line companies are still at the stage of receiving designs for processing and sample mapping. Facing the fast-paced high demand for new models, varieties, and technologies from整车 manufacturers, many independent brake line companies are merely struggling to meet research and development tasks, with no time to improve their basic R&D levels and supporting capabilities. With the development of China's automotive industry in recent years, China became one of the world's top automotive production and sales countries in 2010. However, the industry widely believes that due to the lack of core technology and independent research and development capabilities, China can only be termed as an automotive giant, not a powerful automotive nation. To truly strengthen, one must start with components.
A too-tight brake cable adjustment can damage the auxiliary shaft bearing and roller pins, significantly extending the life of the rear wheel shock absorber bearing. This condition is critical because, after the chain is tightened, it creates a larger forced restraint torque between the auxiliary shaft and the rear wheel shock absorber. Under the influence of this torque, the bearing's task characteristics are destroyed, with unevenly distributed forces causing it to overheat and deteriorate. In recent years, extensive experimental and research work has been conducted on the fatigue performance of chain and sprocket systems, undoubtedly playing a vital role in guiding product design and manufacturing. Even without damage, gaps will form in a short period of time. As the bearing clearance increases, the auxiliary shaft's task linearity is compromised, and roller pin bearings will soon be damaged, transferring the fault from the chain gear to the engine. Therefore, it is crucial to properly and timely adjust the tension of the motorcycle's stainless steel chain.
