| Tamper 08-32 works in area of closed corridor, so operation time is strictly limited to guarantee the railway unblocked. In order to fulfill tasks on time, tamper 08-32 should have two kinds of drive performance: Firstly, high speed driving performance is need, in order to reduce the non-operating time of driving to construction site; Secondly, operating speed must be stable to ensure operation quality and efficiency. Hydro-mechanical transmission is used widely in vehicles, which enable high-speed vehicle with better performance on interval. But it can not satisfy the requirement of steady operating speed because lack of a fixed ratio. Hydrostatic transmission is accurate speed regulation, but it is not suitable to the field of high speed driving in traditional concept. Therefore, existing tamper 08-32 has two transmission systems, hydro-mechanical transmission is for high speed and hydrostatic transmission is for operating speed. Structure of existing tamper 08-32 is complicated, efficiency is low, and axle gear box is damaged frequently. In this paper a hydrostatic transmission system is designed to implement both high/low speed driving, breaking the bottleneck which hydrostatic transmission is not applicable to the field of high speed driving. The main research works are as follow:1. The operational principle of drive system of tamper 08-32 has been analyzed. Defect of drive system is verified by test results. Rationally of that hydrostatic transmission is applicable to tamper 08-32 is discussed.2. New type hydrostatic transmission system is designed. Types, performance parameters, control modes of components are allocated rationally. Braking unit is set to prevent over running in engine when vehicle is braking or driving from ramp.3. Accelerating performance of tamper 08-32 is emphatically studied. Accelerating process of hydrostatic drive system is analyzed in paper by both vehicle dynamic and hydraulic transmission theory. Accelerating strategy is made based on this. In order to realized control model of constant-power acceleration, two accelerating control scheme, electric proportional adjusting hydraulic pump/HA high pressure auto vitiate displacement hydraulic motor and electric proportional adjusting hydraulic pump/electric proportional adjusting hydraulic motor, are made.4. The model of hydrostatic transmission system is built by AMESim, and accelerating process of vehicle is simulated by the same time. Finally, accelerating test of hydrostatic transmission system has been done. |
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