| 摘要 |
Provided is a gear pump capable of being manufactured at a high dimension precision without a special resin material or an injection molding machine suppressing the generation of contraction deformation and also having a driving gear with the reduced strength weakness of a welding line. The gear pump comprises: a housing having a pump chamber communicating with an inlet and an outlet of a fluid; a motor; and a pump gear made of a resin and disposed in the pump chamber. The pump gear includes: a driving gear rotated by the motor; and a driven gear engaged with the driving gear. The driving gear has a straight welding line extending in the diameter direction. A shaft hole part of the driving gear has a D-cut part with a planar D-cut surface formed partially in the diameter direction of the inner circumferential surface. The straight line passing through the circumferential end of the D-cut surface starting from a diameter-directional center of the D-cut part has a different circumferential position in the driving gear from the welding line. |
