Rotociprocating pump

A pump assembly for use in a railway lubricating system which comprises:

• a rotociprocating pump which comprises a housing defining an inlet chamber;
• an inlet port leading to the inlet chamber;
• an outlet port;
• an outlet channel leading from the inlet chamber to the outlet port, said outlet port having a smaller cross section than a cross section of said outlet channel;
• a discharge chamber;
• a gear chamber in communication with the discharge chamber;
• an intake opening leading to the gear chamber;
• a discharge port communicating with the discharge chamber;
• interengaged gears positioned in the gear chamber for conveying fluid from the inlet opening to the discharge chamber;
• and a double-headed piston having a first head in the inlet chamber and a second head in the discharge chamber, such that after priming fluid has moved through the gear chamber into the discharge chamber;
• checked pulses of fluid entering the inlet chamber through the inlet port will move the piston from a first position to a second position so as to discharge fluid from the discharge chamber through the discharge port,
• a hydraulic motor connected to rotate said interengaged gears of said rotociprocating pump, and,
• a conduit connecting said outlet port of said rotociprocating pump with said hydraulic motor to convey hydraulic fluid to said hydraulic motor to operate same.