Tandem piston pump

A tandem piston pump from which pump discharge pressure from a plurality of systems is extracted, comprising:

• a shaft that rotates about a rotary axis;
• a front pump and a rear pump provided in series in a rotary axis direction;
• and
• a port block provided between the front pump and the rear pump,
• wherein the front pump comprises:
• a front cylinder block that is rotated by the shaft;
• a front swash plate that causes a plurality of pistons to reciprocate when the front cylinder block rotates;
• a plurality of discharge ports through which working oil discharged by the respective pistons passes;
• and
• a plurality of pump ports that communicate with the respective discharge ports to extract pump discharge pressure therefrom,
• the rear pump comprises:
• a rear cylinder block that is rotated by the shaft;
• a rear swash plate that causes a plurality of pistons to reciprocate when the rear cylinder block rotates;
• a plurality of discharge ports through which working oil discharged by the respective pistons passes;
• and
• a plurality of pump ports that communicate with the respective discharge ports to extract pump discharge pressure therefrom,
• a tilt axis direction of the front swash plate and a tilt axis direction of the rear swash plate are different to each other,
• the respective discharge ports of the rear pump are opened at a phase difference relative to the respective discharge ports of the front pump, and
• the respective pump ports of the front pump and the respective pump ports of the rear pump are opened in different side faces of the port block.