Usui Co., Ltd.

Usui Kokusai Sangyo Kaisha Limited

Shuji Suzuki

Hiroyuki Nishizawa

Koichi Hayashi

To obtain a gasoline direct injection rail provided with an inlet capable of reducing pressure pulsation without increasing the inner diameter of a high-pressure pipe even when the pressure of a system is increased. A gasoline direct injection rail comprises an inletat a first endof a rail body, wherein an orificeis provided inside the rail body, the inlethas a fuel flow passage, and a hollow partis provided between the fuel flow passageand the orifice

Gasoline direct injection rail

To obtain a gasoline direct injection rail in which a large load is unlikely to be concentrated on a boundary part between a rail body and an end cap, and damage to the boundary part can be prevented, even when high pressure is applied to the inside of the rail body. The gasoline direct injection rail comprises an end capcomposed of a top plateand a circumferential wall, and a rail bodyhaving an end partin which the circumferential wallof the end capis inserted and placed, wherein an inner circumference of the end partof the rail bodyhas a depression, the circumferential wallis placed in the depression, and there is no level difference at a boundary partbetween an inner circumferential surfaceof the circumferential walland an inner circumferential surfaceof the rail body

End cap

The present invention aims for obtaining a fuel rail for gasoline direct injection which can be used for the direct injection at a high fuel pressure of 50 MPa or more by increasing the thickness at the portion near the branch hole and using the material having high thickness for the metal seal portion while keeping the weight light and keeping the cost low. A fuel rail for gasoline direct injection made of steel and used at a fuel pressure of 50 MPa or more, the fuel rail having: a plurality of block membersand a pipe memberwhich connects an interval between the block members, wherein the block membershave: a branch holewhich communicates with the pipe memberand a metal seal portionto which an injector is connected, and the hardness of the block membersis higher than the hardness of the pipe member

Rail for high-pressure direct injection

To obtain a gasoline direct injection rail that enables plating treatment to be easily and reliably performed on the inside of a rail body and an inlet part, also, that includes an orifice, and that has excellent mechanical properties. In a gasoline direct injection rail comprising a steel rail body, an inlet partprovided integrally with or separately from a first endof the rail bodyand comprising therein a communication passagein communication with a fuel passage of the rail body, and a plurality of injector holders in communication with the fuel passage, a stainless orifice memberformed separately from the rail bodyis securely disposed in the communication passageof the inlet part

To improve the ability to layout delivery pipes by maintaining flexibility in a mounting position of an inlet pipe to a delivery pipe main body. A delivery pipe for gasoline comprising a flat shaped delivery pipe main bodyprovided with a pair of facing wide wallsand a pair of facing narrow wallsthat are more narrow than the pair of wide walls, wherein an inlet pipeis disposed and connected to the narrow wallof the delivery pipe main body, and a connecting portionof the inlet pipeand the narrow wallis covered continuously by a reinforcing materialfrom the connecting portionover the wide walls, thereby reinforcing the connection portion

Gasoline delivery pipe

Provided is an end seal structure of a fuel rail for a gasoline direct injection engine that has a simple structure and allows an end cap part to meet higher pressure requirements in a fuel rail having the structure in which one end or both ends of a rail body composed of a tubular member, such as a pipe, is/are closed by an end cap or end caps. The end seal structure employs a thread fastening method using the end cap and a collar brazed at the opening end of the fuel rail body and a gasket sealing method as a sealing method, wherein a gasket interposed between the end cap and the fuel rail body is tightened by an axial force generated due to tightening of the end cap that is screwed and fastened to the fuel rail body so as to be sealed.

End seal structure of fuel rail for gasoline direct injection engine

Provided is an end seal structure of a fuel rail for a gasoline direct injection engine, the end seal structure being characterized in that: a collar is joined by brazing to an outer circumference of an end of a pipe of the rail body including a pipe; the end cap having a cap-nut shape and including a sealing projection on an surface thereof facing the opening at the end of the pipe of the rail body, is screwed and fixed to the collar; and the sealing projection of the end cap brings into pressure contact with the end of the opening of the rail body by an axial force created by tightening of the end cap having the cap-nut shape to seal the end of the opening of the rail body.

Growing community of inventors

Shizuoka, Japan

Shuji Suzuki