초록 ▼

A stepless transmission including a fixed displacement rotary pump and an adjustable pressure compensated flow control valve which adjustably limits the output of the pump to any selected value between a predetermined maximum and a predetermined minimum whereat the pump housing and the pumping unit

A stepless transmission including a fixed displacement rotary pump and an adjustable pressure compensated flow control valve which adjustably limits the output of the pump to any selected value between a predetermined maximum and a predetermined minimum whereat the pump housing and the pumping unit therein are locked against relative rotation. In the case of coaxial shafts fixed to the pump housing and pumping unit respectively, the driving shaft drives the driven shaft at the same speed less the speed corresponding to the adjusted limit of the pump even under varying load conditions on the driven shaft. In the case of an epicyclic train having input and output shafts fixed to selected gears of the train, the pump-valve assembly adjustably limits the speed of rotation of another gear of the train, thereby establishing a desired speed of the output shaft under varying load conditions. In addition, a variable speed belt drive between the input shaft and the another gear of the train adjusts the pump-valve assembly responsive to increased load on the output shaft to avoid overloading of the belt drive.

대표청구항 ▼

In combination, a fixed displacement rotary pump comprising a housing having inlet and outlet ports, and a pumping unit in said housing operative upon relative rotation of said housing and unit to pump fluid from said inlet port to said outlet port; an adjustable pressure compensated flow control va

In combination, a fixed displacement rotary pump comprising a housing having inlet and outlet ports, and a pumping unit in said housing operative upon relative rotation of said housing and unit to pump fluid from said inlet port to said outlet port; an adjustable pressure compensated flow control valve operatively interposed between said ports to adjustably limit the rate of flow of fluid therethrough and consequently the rate of relative rotation of said housing and unit from a predetermined maximum to a predetermined minimum whereat said housing and unit are locked against relative rotation; and an epicyclic gear train including a first shaft in driving engagement with a first gear of said train and with one of said housing and pumping unit, and a second shaft in driving engagement with a second gear of said train; the other of said housing and pumping unit being in driving engagement with a third gear of said train.