Patent ID: 8353683

Claim:
A micropump for a peristaltic drive system for pressing a tube having elasticity to transport a fluid, the micropump comprising: a pump module including the tube, a cam that presses the tube, and a cam shaft on which the cam is pivotally mounted; a drive module including a drive force transmission mechanism that has a transmission wheel including a pinion and a first transmission gear, and a cam drive wheel including a drive shaft and a second transmission gear, and that transmits a drive force from a motor to the cam shaft through the transmission wheel and the cam drive wheel, the drive module being provided below the pump module; and a coupling member that detachably couples the pump module and the drive module, the coupling member being provided alongside the pump module and the drive module, wherein the cam shaft has a first fitting portion in a first non-circular shape, the cam drive wheel is detachable from the cam shaft, the drive force is transmitted from the pinion to the drive shaft through the second transmission gear, and the drive shaft has a second fitting portion in a second non-circular shape, the first non-circular shape has a first plurality of curved angles, the second non-circular shape has a second plurality of curved angles, the first and second fitting portions are press fit into place by pressure from an elastic member when the first and second plurality of curved angles are aligned with each other through rotating the cam drive wheel by the motor, and when the first and second fitting portion are press fit into place by the pressure from the elastic member, an edge of the second transmission gear slides downward along the pinion and stops without contacting the first transmission gear so that dimensions of the first and second transmission gears are set to provide clearance.