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本文以总功率变量泵驱动定量液压马达为例,对集中液压传动的轮式挖掘机底盘传动系的牵引性能进行了初步分析。把“发动机液压泵液压马达”看作一台新的“发动机”,并求它们联合工作的输出特性曲线,由此证明,因发动机、液压泵和液压马达的共同调速作用,当输出功率在一定范围内变化时,其调速性能优于机械式传动系,其传动系各档总传动比之间的公比也可大于机械式传动系。在传动系处于各个档位时,因液压泵的变量作用,均可在所需范围内实现无级调速,其牵引力和行驶速度成双曲线关系,牵引功率为常数。本文还对传动系各档之间公比与泵的变量系数之间关系、档位数的确定、各档总调速范围的计算等进行了论述。
In this paper, the traction performance of a concentrated hydraulically driven wheeled excavator chassis drive system is analyzed based on the example of a total power variable displacement pump driven hydraulic motor. The “hydraulic engine of the engine hydraulic pump” is regarded as a new “engine”, and the output characteristic curve of the joint work is demanded. This proves that, due to the common speed regulation of the engine, the hydraulic pump and the hydraulic motor, when the output power is at a certain level When the range is changed, the speed regulation performance is better than that of the mechanical transmission system, and the ratio between the total transmission ratios of the gears of the transmission system may also be greater than that of the mechanical transmission system. When the drive train is in each gear, due to the variable action of the hydraulic pump, stepless speed regulation can be achieved within the required range. Its traction force and travel speed are in a hyperbolic relationship and the traction power is constant. This article also discusses the relationship between the ratio of the common gear and the pump’s variable coefficient, the determination of the number of gears, and the calculation of the total speed range of each file.