Valve device for fuel tank

A valve device for a fuel tank, adapted to be attached to a fuel tank, comprising:

• a case including a vent valve port communicating with an outside of the fuel tank at an upper portion, and including an inflow portion for a fuel below the vent valve port;
• and
• a float body which is located inside the case and rises by the fuel flowing into the case so as to be seated in the vent valve port,
• wherein in a face portion facing a bottom portion of the float body in the case, an elastic piece is formed by a first arc-shaped split groove formed such that a center of the face portion becomes a curvature inner side, a second arc-shaped split groove formed outside the first arc-shaped split groove such that the center of the face portion becomes a curvature inner side, and a communication portion communicating between groove ends of the first and second arc-shaped split grooves, and a communication portion side becomes a free end,
• one portion of the elastic piece abuts against the bottom portion of the float body,
• in the free end of the elastic piece, an abutment portion relative to the bottom portion of the float body is protruded,
• by a third arc-shaped split groove formed outside the second arc-shaped split groove such that the center of the face portion of the case becomes a curvature inner side;
• and a supplemental communication portion communicating between one groove end of the second arc-shaped split groove and one groove end of the third arc-shaped split groove, a supplemental elastic piece in which a communication portion side is a free end is formed, and
• in the free end of the supplemental elastic piece, an abutment portion relative to the bottom portion of the float body is protruded.

A valve device for a fuel tank, adapted to be attached to a fuel tank, comprising:

• a case including a vent valve port communicating with an outside of the fuel tank at an upper portion, and including an inflow portion for a fuel below the vent valve port;
• and
• a float body which is located inside the case and rises by the fuel flowing into the case so as to be seated in the vent valve port,
• wherein in a face portion facing a bottom portion of the float body in the case, an elastic piece is formed by a first arc-shaped split groove formed such that a center of the face portion becomes a curvature inner side, and a second arc-shaped split groove formed outside the first arc-shaped split groove such that the center of the face portion becomes a curvature inner side,
• the elastic piece has an arc-shape in which the center of the face portion becomes a curvature inner side,
• one portion of the elastic piece abuts against the bottom portion of the float body,
• the first arc-shaped split groove, the second arc-shaped split groove, and the elastic piece have an arc-shape curving around a center axis of the case,
• the face portion further comprises a communicating portion extending radially at intermediate positions of the first and second arc-shaped split grooves to communicate the first and second arc-shaped split grooves, and
• the elastic piece includes first and second elastic pieces wherein each of a free end of the first and second elastic pieces has an abutment portion.

A valve device for a fuel tank, adapted to be attached to a fuel tank, comprising:

• a case including a vent valve port communicating with an outside of the fuel tank at an upper portion, and including an inflow portion for a fuel below the vent valve port;
• and
• a float body which is located inside the case and rises by the fuel flowing into the case so as to be seated in the vent valve port,
• wherein in a face portion facing a bottom portion of the float body in the case, an elastic piece is formed by a first arc-shaped split groove formed such that a center of the face portion becomes a curvature inner side, and a second arc-shaped split groove formed outside the first arc-shaped split groove such that the center of the face portion becomes a curvature inner side,
• the elastic piece has an arc-shape in which the center of the face portion becomes a curvature inner side,
• one portion of the elastic piece abuts against the bottom portion of the float body,
• the elastic piece is disposed in the face portion between the first arc-shaped split groove and the second arc-shaped split groove,
• the first arc-shaped split groove, the second arc-shaped split groove, and the elastic piece have an arc-shape curving around a center axis of the case, and
• the face portion further comprises a communicating portion communicating the first and second arc-shaped split grooves, the communicating portion comprising a first groove extending radially inwardly from one groove end of the first arc-shaped split groove;
• a second groove extending radially inwardly from one groove end of the second arc-shaped split groove and extending beyond the first arc-shaped split groove;
• and a third groove extending perpendicular to the first and second grooves to communicate the first and second grooves.