Speed changing control method and speed changing mechanism thereof

A speed changing mechanism, comprising a pump comprising a liquid suction channel, a liquid drainage channel, and working components which move relatively to each other forming a plurality of working volumes, wherein a relative movement of the working components leads to a periodic increase and decrease of the working volumes, so that a fluid is sucked through the liquid suction channel and is discharged through the liquid drainage channel, and a pressure energy discharging the fluid is increased by an excursion of the working components, wherein the speed changing mechanism is characterized in that a part of working components of pump is connected to an input component, another part of working components of pump is connected to an output component, the speed changing mechanism further comprises a flow control device disposed at the liquid suction channel or/and the liquid drainage channel;

• wherein the pump is a gear pump, the working component comprises a pump body, a center gear and a planetary gear engaged with the center gear, wherein the center gear is rotatablely disposed on the pump body, the planetary gear is rotatablely connected with a planetary gear shaft, the planetary gear shaft is supported on the pump body, one of the center gear and the pump body is connected with the input component, and the other of the center gear and the pump body is connected with the output component;
• wherein an oil ring is provided at a peripheral edge of the pump body of the gear pump, the oil ring is rotatablely connected with the pump body, an annular liquid inlet passage and an annular liquid outlet passage are provided at an inner peripheral surface of the oil ring, the liquid suction channel and the liquid drainage channel disposed on the pump body are communicated with the annular liquid inlet passage and the annular liquid outlet passage, respectively, the liquid inlet pathway and the liquid outlet pathway communicating with the annular liquid inlet passage and the annular liquid outlet passage are provided on the oil ring, and two flow control devices are provided at the liquid inlet pathway and the liquid outlet pathway, respectively.

A speed changing mechanism, comprising a pump comprising a liquid suction channel, a liquid drainage channel, and working components which move relatively to each other forming a plurality of working volumes, wherein a relative movement of the working components leads to a periodic increase and decrease of the working volumes, so that a fluid is sucked through the liquid suction channel and is discharged through the liquid drainage channel, and a pressure energy discharging the fluid is increased by an excursion of the working components, wherein the speed changing mechanism is characterized in that a part of working components of pump is connected to an input component, another part of working components of pump is connected to an output component, the speed changing mechanism further comprises a flow control device disposed at the liquid suction channel or/and the liquid drainage channel;

• wherein an oil ring is provided at a peripheral edge of the pump body of the pump, the oil ring is rotatablely connected with the pump, an annular liquid inlet passage and annular liquid outlet passage are provided at an inner peripheral surface of the oil ring, the liquid suction channel and the liquid drainage channel of the pump are communicated with the annular liquid inlet passage and the annular liquid outlet passage, respectively, the liquid inlet pathway and the liquid outlet pathway communicating with the annular liquid inlet passage and the annular liquid outlet passage are provided on the oil ring, and two flow control devices are provided at the liquid inlet pathway and the liquid outlet pathway, respectively.