Diaphragm pump

A diaphragm pump comprising:

• a diaphragm including a deformation portion constituting part of a wall of a pump chamber;
• a crank body fixed to a rotating shaft of a motor;
• a driving shaft that is fixed at an eccentric position of the crank body and inclined;
• a driving body that is rotatably supported by the driving shaft via a bearing and configured to convert a rotation of the crank body into a reciprocating motion and transfer the reciprocating motion to the deformation portion;
• and
• a pump mechanism configured to alternately repeat a state in which a fluid is exhausted from the pump chamber and a state in which the fluid is sucked into the pump chamber along with the reciprocating motion of the driving body,
• the driving body including:
• a shaft portion configured to store and hold the bearing in a fitted state;
• and
• an arm portion that projects outward in a radial direction from the shaft portion and is connected to the deformation portion, and
• the bearing including:
• a first bearing and a second bearing superimposed on each other in a state in which the first bearing and the second bearing are aligned in an axial direction of the driving shaft, the first bearing being closer to the crank body than the second bearing;
• a shaft hole configured to rotatably fit the driving shaft, the shaft hole including a through hole formed in the first bearing and a non-through hole formed in the second bearing;
• and
• an oil reservoir formed at a boundary between the first bearing and the second bearing, wherein the shaft portion includes a first end portion, and a second end portion spaced apart from the crank body in comparison with the first end portion,
• the arm portion is connected to the second end portion,
• the second end portion includes an opening in which the second bearing is inserted, and
• an annular gap is formed between an inner surface of the opening and an outer surface of the second bearing.