Ship propulsion machine

A ship propulsion machine comprising:

• a first motor;
• a second motor;
• a first inverter configured to generate a drive current for controlling drive of the first motor;
• a second inverter configured to generate a drive current for controlling drive of the second motor;
• a propeller;
• a power transmission mechanism configured to transmit power of each of the first motor and the second motor to the propeller;
• and
• a cooling mechanism configured to cool the first motor, the second motor, the first inverter, and the second inverter,
• wherein the cooling mechanism comprises:
• a first motor water jacket provided in the first motor and configured to cool the first motor by allowing cooling water to flow therein;
• a second motor water jacket provided in the second motor and configured to cool the second motor by allowing the cooling water to flow therein;
• a first inverter water jacket provided in the first inverter and configured to cool the first inverter by allowing the cooling water to flow therein;
• a second inverter water jacket provided in the second inverter and configured to cool the second inverter by allowing the cooling water to flow therein;
• a first cooling water passage configured to allow the cooling water to flow toward the first motor water jacket and the first inverter water jacket;
• a branch passage connecting the first motor water jacket and the first inverter water jacket to the first cooling water passage such that the first motor water jacket and the first inverter water jacket are connected in parallel with each other, the branch passage being configured to distribute and supply the cooling water flowing in the first cooling water passage to the first motor water jacket and the first inverter water jacket;
• a first connecting passage connecting the second motor water jacket to a downstream side of the first motor water jacket and configured to deliver the cooling water flowing in the first motor water jacket to the second motor water jacket;
• and
• a second connecting passage connecting the second inverter water jacket to a downstream side of the first inverter water jacket and configured to deliver the cooling water flowing in the first inverter water jacket to the second inverter water jacket.