Connection structure for branching connector in high-pressure fuel rail
AssigneeUsui Kokusai Sangyo Kaisha Limited
InventorYoshiyuki Hashimoto
Life of this patent
Estimating the term…
Abstract
Possible penetration into the pressure bearing surface of the pressure head portion of the branching connector when the pressure bearing surface is connected in abutting engagement to the pressure receiving bearing surface of the fuel rail is prevented by providing a relief portion at least on both sides
Claims15
A connection structure for a branching fitting in a high-pressure fuel rail, said fuel rail having an elongated cylindrical peripheral wall defining an outer periphery and an axially extending through passage, a plurality of radially aligned through holes being formed at a plurality of positions in the axial direction in the peripheral wall of the fuel rail and communicating with the through passage formed axially in said fuel rail and serving to pass a high-pressure fuel, a plurality of elongated branching connectors connected orthogonally to the fuel rail at the respective through holes therein, each said branching connector having a flow path defined axially therein communicating with the respective through hole and the axially extending through passage of the fuel rail, each said branching connector further having a terminal end defining a pressure head portion defined by a surface of revolution about the axis of the respective branching connector, and wherein each said through hole is defined by a an outwardly opening pressure receiving bearing surface formed in said peripheral wall around the through hole, each said pressure receiving bearing surface being abutted by the pressure head portion formed on the corresponding branching connector, said pressure receiving bearing surface being formed to define a surface of revolution about the axis of said through hole, such that said pressure head portion of said branching connector and said pressure receiving bearing surface of said fuel rail abut to define a line of contact which is circular, and relief portions extending between the outer periphery of the fuel rail and each outwardly opening pressure receiving bearing surface, said relief portions being elongated with portions disposed at least on opposite respective sides of each said through hole in the longitudinal direction of said fuel rail, whereby said relief portions enable efficient sealing of the pressure head portion to the pressure receiving bearing surface without damage to the pressure head portion for both aligned and misaligned branching connectors.
The connection structure for the branching connector in the high-pressure fuel rail according to claim (1), wherein said relief portion consists of a substantially circular arc surface formed on the outwardly opening terminal periphery of the pressure receiving bearing surface.
The connection structure for the branching connector in the high-pressure fuel rail according to claim (1), wherein each relief portion consists of a conical surface.
The connection structure for the branching connector in the high-pressure fuel rail according to claim (1), wherein the branching connector consists of a branch pipe.
The connection structure for the branching connector in the high-pressure fuel rail according to claim (1), wherein the fuel rail consists of a fuel manifold.
A connection structure for a branching fitting in a high-pressure fuel rail, said fuel rail having an elongated cylindrical peripheral wall defining an outer periphery and an axially extending through passage, a plurality of radially aligned through holes being formed at a plurality of positions in the axial direction in the peripheral wall of the fuel rail and communicating with the through passage formed axially in said fuel rail, a plurality of elongated branching connectors connected orthogonally to the fuel rail at the respective through holes therein, each said branching connector having a flow path defined axially therein communicating with the respective through hole and the axially extending through passage of the fuel rail, each said branching connector further having a terminal end defining a pressure head portion defined by a surface of revolution about the axis of the respective branching connector, each said through hole being defined by an outwardly opening pressure receiving bearing surface formed in said peripheral wall around the through hole and being formed to define a surface of revolution about the axis of said through hole, each said pressure head portion of said branching connector abutting said pressure receiving bearing surface of said fuel rail at a line of contact which is circular, and relief portions extending between the pressure receiving bearing surface of each said through hole and the outer periphery of the fuel rail, said relief portions being elongated with portions disposed at least on opposite respective sides of each said through hole in the longitudinal direction of said fuel rail, each said relief portion being defined by a plurality of intersecting surfaces with the radially outer surfaces of each relief portion being aligned at smaller angles to the outer periphery of the fuel rail then radially inner surfaces of each said relief portion, whereby said relief portions enable efficient sealing of the pressure head portion to the pressure receiving bearing surface without damage to the pressure head portion for both aligned and misaligned branching connectors.
Dependencies are inferred from the claim text.