Pump gear
AssigneeIsuzu Motors Limited
InventorKengo Hayashi
Life of this patent
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Abstract
The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation S1 radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.
Claims4
A pump gear configured to be mounted on an input shaft of a supply pump that pumps fuel, comprising:
- a hollow portion that is open to a distal end side in an axial direction;
- and
- a tapered surface that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction, wherein
- the tapered surface is formed so that a focusing point of sound radiating perpendicularly from a distal end portion in the axial direction of the tapered surface is positioned at a distal endmost position in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.
Dependencies are inferred from the claim text.