Urban passenger transport plays an important role in the functioning of cities and ensuring the livelihood of the population. Changing the gear ratio of the transmission can affect the characteristics of city passenger buses in various aspects. Changing the gear ratio of the transmission can affect the performance of urban passenger buses in various ways. If the transmission has a shorter gear ratio, it can allow the bus to accelerate faster at low speeds, which is useful in urban traffic with many stops. Therefore, the choice of transmission ratio usually depends on the type of vehicle, driving conditions and fuel efficiency and dynamic performance requirements. Transmissions of city passenger buses may have some specific features, taking into account their purpose and operating conditions. City bus transmissions can be set up for frequent acceleration and braking, which is characteristic of driving in city traffic with many stops. Given that city buses often travel at low speeds in densely populated urban areas, transmissions can be optimized for low speed efficiency. Some city buses can be equipped with automatic transmissions to facilitate the driving process and increase the comfort of passengers. Taking into account the specific works of urban transport, the purpose and tasks of the study were defined as the development and justification of technical improvements of LAZ bus units and units. The article proposes to carry out the reconstruction of the gearbox in order to optimize the gear ratio of the transmission for the special operating conditions of city transport, namely, movement in the start-stop mode. The dynamic properties and acceleration parameters of the vehicle were calculated before and after the reconstruction of the gearbox. It was established that the bus with the modernized transmission has better dynamic characteristics, namely acceleration speed.

transmission, clutch, gear ratio, acceleration, operational characteristics of a passenger bus

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