INNER ROTOR FOR INTERNAL GEAR PUMP

• Main Author: HOSONO, KATSUAKI
• Format: Patent
• Language: English; French; German
• Published: 05.12.2012
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

PROBLEMS Local stress concentration caused by rotational moment transmitted from a crankshaft is eased. MEANS FOR SOLVING PROBLEMS A crankshaft (6) and an mounting hole (5) have two main circular arc parts (11, 21) on the same circle; and two connecting parts (12, 22) for connecting the adjacent main circular arc parts (11, 21), and have a cross-sectional shape in which the connecting parts (12, 22) facing each other are substantially parallel. The connecting parts (22) of the mounting hole (5) are formed in the shape of a large circular arc which projects inward. The torque of the crankshaft (6) is transmitted to the mounting hole (5) in a state where the connecting parts (12) of the crankshaft (6) and the connecting parts (22) of the mounting hole (5) which are formed in the shape of a large circular arc come into line contact with each other; therefore, the value of any local stress generated in the mounting hole (5) can be reduced.