Pinion gear for a fishing reel

1. A pinion gear configured to mesh with a drive gear, the drive gear connected to a handle shaft of a fishing reel for winding a fishing line onto a spool supported by a reel body by rotational operation of the handle shaft, the handle shaft rotatably supported by the reel body, and the drive gear configured to transmit the rotation of the handle shaft, the pinion gear comprising:

a gear portion configured to mesh with the drive gear; and

a shaft portion non-rotatably fixed to the gear portion, and integrally rotatable with the gear portion,

the gear portion and the shaft portion being formed from different materials, and a specific gravity of the shaft portion being lower than a specific gravity of the gear portion.

2. The pinion gear according to claim 1 , wherein the gear portion and the shaft portion are fixed to each other by an adhesive.

3. The pinion gear according to claim 2 , wherein

a hole is formed in the gear portion and extends therethrough in a rotational axis direction of the pinion gear and into which the shaft portion is fitted,

the hole in the gear portion includes a tapered inner perimeter surface, an inner diameter at a first end of the hole in the rotational axis direction being greater than an inner diameter at a second end,

an outer perimeter surface of at least a portion of an area to which the gear portion of the shaft portion is fitted is a tapered outer perimeter surface, an outer diameter of the tapered outer perimeter surface at a first end in the rotational axis direction is greater than an outer diameter of the tapered outer perimeter surface at a second end, and

the adhesive is interposed between the tapered inner perimeter surface and the tapered outer perimeter surface.

4. The pinion gear according to claim 3 , wherein

the inner perimeter surface includes a cylindrical inner side surface parallel to the rotational axis of the pinion gear at the first end of the tapered inner perimeter surface of the gear portion,

an abutting surface with which the gear portion abuts in the rotational axis direction, and a cylindrical outer side surface parallel to the rotational axis, are formed on the outer perimeter surface on the first end of the tapered outer perimeter surface of the shaft portion, and

the cylindrical inner side surface of the gear portion is fitted to the cylindrical outer side surface of the shaft portion.

5. The pinion gear according to claim 4 , wherein

a length of the cylindrical inner side surface in the rotational axis direction is greater than a length of the cylindrical outer side surface in the rotational axis direction, and

an outer diameter of the cylindrical outer side surface of the shaft portion is greater than a maximum inner diameter of the tapered inner perimeter surface of the shaft portion.

6. The pinion gear according to claim 1 , wherein

the gear portion is formed from brass, and

the shaft portion is formed from aluminum alloy.

7. The pinion gear according to claim 1 wherein

the gear portion is formed from metal, and

the shaft portion is formed from synthetic resin.

8. The pinion gear according to claim 1 , wherein

the fishing reel is a spinning reel comprising a rotor configured to wind the fishing line onto the spool by rotational operation of the handle shaft, and

the pinion gear is configured to transmit rotation of the handle shaft to the rotor.

9. A spinning reel, comprising:

a reel body;

a handle shaft rotatably supported by the reel body;

a spool supported by the reel body and onto which a fishing line is configured to be wound by a rotational operation of the handle shaft;

a rotor configured to wind the fishing line onto the spool by the rotational operation of the handle shaft; and

the pinion gear according to claim 1 ,

the pinion gear configured to transmit the rotation of the handle shaft to the rotor.