ROTATING RECIPROCATING PISTON PUMP WITH A BARREL CAM

Provided is a metering pump. The metering pump includes a motor and a motor shaft and a pump housing having an inlet port and an outlet port. Encased within the pump housing and engaged to the motor shaft is a piston. The motor shaft imparts rotational movement upon the piston. The metering pump further includes two barrel cam halves engaged to the piston. Between the two barrel cam halves is a cam follower pin which in combination with the two barrel cam halves allows the piston to move in a reciprocating manner upon rotation of the motor shaft. Thus, the piston is capable of moving in both a rotational and reciprocating manner along the same axis.