Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Hitachi Astemo Ltd.

Hitachi Unisia Automotive, Ltd.

Takahiro Saito

Nobuaki Kobayashi

Yoshio Okamoto

Noriyuki Maekawa

Akihiro Yamazaki

Yoshihito Yasukawa

Eiji Ishii

Kazuki Yoshimura

Shinya Okamoto

Xudong Zhang

Mitsuhiro Matsuzawa

Atsushi Nakai

Eiji Tamura

Akiyasu Miyamoto

Hiroshi Ohno

Hiroshi Yamada

Motoyuki Abe

Masanori Ishikawa

Nobuya Sekiyama

Hidehiko Koyashiki

Ryuta Kinoshita

There is provided a hollow composite magnetic member obtained by partially reforming a hollow member which is formed of a ferromagnetic material containing Cr of 15 mass % or more and 18 mass % or less, in which the reformed portion includes an alloy containing Cr of 8 mass % or more and 18 mass % and Ni of 6.5 mass % or more and 50 mass % or less. Accordingly, a hollow composite magnetic member having a small width of the nonmagnetic portion and a fuel injection valve having the same can be provided.

Hollow composite magnetic member, process for producing same, and fuel ejection valve

In the present invention, two side-section side surfaces and each horizontal passage run along a fuel flow direction and have a linear section, and an end-section side surface formed between the two side-section side surfaces and forming an upstream-side end portion has a curved section connected to the side-section side surfaces and. When a fuel inlet and the horizontal passages are projected onto a plane perpendicular to a valve axial center, a projected line of the linear section of each of the horizontal passages extends to a place intersecting a projected line of the opening edge of the fuel inlet, and the upstream-side end portion of each of the horizontal passages extends toward the inside of the opening edge.

Fuel injection valve

A fuel injection valve includes a valve seat, a valve element, and a plurality of swirl fuel injection passages. The plurality of swirl fuel injection passages are divided into a first swirl fuel injection passage group that forms a first spray and a second swirl fuel injection passage group that forms a second spray that is oriented in a direction different from a first direction.

Electromagnetic solenoid has movable core having end surface that is formed between inner circumferential surface and outer circumferential surface of movable core; and fixed core having end surface that is formed between inner circumferential surface and outer circumferential surface of fixed core and faces the end surface of movable core. Ring-shaped protruding portion is formed at least either one of the end surface of the movable core or the end surface of the fixed core. Protruding portion is provided at a position that is shifted to a radially inner circumferential side of the end surface. A length between apex and inner circumferential edge of protruding portion is shorter than a length between the apex and an outer circumferential edge of protruding portion.

Electromagnetic solenoid and fuel injection valve

A solenoid pipe is formed of a ferromagnetic material containing 15-18 mass % of Cr, an electromagnetic coil, and a valve body. The pipe includes a reform portion, having a composition in which a component of the ferromagnetic material is mixed with a component of a Ni-containing material. A ratio, e/d, of a maximum deformation, e, of an outer circumferential surface side of the reform portion of the pipe with respect to a thickness, d, of the pipe near the reform portion is 0.5 or less, and a ratio, c/d, of a maximum deformation, c, of an inner circumferential surface side of the reform portion of the pipe with respect to the thickness, d, of the pipe is 0.5 or less.

Solenoid valve and method for manufacturing the same

Provided is a fuel injection valve which can be easily processed and can realize sufficient atomization while suppressing spreading of spray. In the fuel injection valve according to the present invention, when a nozzle plateand a first direction-in which fuel is sprayed are projected onto a virtual plane perpendicular to a central axis line of the fuel injection valve along an opening and closing valve direction of a valve body and a first orthogonal coordinate system having an Xpassing through a center Oof the nozzle plateand along the first direction-and a Yaxis passing through the center Oof the nozzle plateand perpendicular to the Xaxis is virtualized on the virtual plane, an introduction passage-is inclined so that a straight line segment-connecting between a central point-of an upstream side end portion and a center Oa-of an inlet opening surface of a fuel injection hole-is positioned on the Yaxis side with respect to a straight line-passing through the central point-and the center Oof the nozzle plate

A fuel injection valve includes: a valve seat member to which the valve seat is formed; a welding portion between the valve seat member and the cylindrical member, which is provided on the base end side of the stepped surface, the valve seat member being assembled to be press-fit in the cylindrical member so that a tip end side abutment pressure between an inner circumference surface of the cylindrical member, and a tip end side outer circumference surface portion of the valve seat member which is on the tip end side of the stepped surface is smaller than a base end side abutment pressure between the inner circumference surface of the cylindrical member, and a base end side outer circumference surface portion of the valve seat member which is on the base end side of the stepped surface portion.

There is provided a manufacturing method of a hollow composite magnetic member having weakened magnetism in a portion of a ferromagnetic hollow member, the method includes: a step of forming a weak-magnetic area having weakened magnetism by melting and mixing a Ni-containing material and the hollow member by continuously supplying the Ni-containing material to a portion of the hollow member and heating the irradiation area having a line segment shape with the laser beam. Accordingly, since it is possible to prevent drop of a local portion of a hollow ferromagnetic pipe from being easily generated by a weak-magnetization treatment, to greatly reduce deformation generated by laser irradiation, and it becomes unnecessary to adjust the shielding gas pressure inside the pipe, the weak-magnetization treatment can be performed with higher efficiency and higher quality.

Method and apparatus for manufacturing hollow composite magnetic member, and fuel injection valve

The present invention includes a valve seat and a valve body that cooperatively open/close a fuel passage, a movable element having the valve body provided at one end part thereof and a movable iron coreprovided at the other end part thereof, a fixed iron corewhich faces the movable iron coreand which attracts the movable iron coreby applying a magnetic attraction force thereto, and a cylindrical member that includes thereinside the fixed iron coreand the movable iron core. The fixed iron coreincludes a reduced-diameter parton an outer circumferential surface at the side facing the movable iron core, and the movable iron coreincludes a reduced-diameter parton an outer circumferential surface at the side facing the fixed iron core

One passage for swirling is formed in an orifice plate fixed on a nozzle body. Two swirl chambers in which fuel is caused to swirl so that the fuel has swirling force are provided at an end of the one passage for swirling on the downstream side of the flow direction of fuel. Therefore, the collision between the swirling flow in the swirl chamber and the fuel flowing in the passage for swirling is mitigated, and the swirling flow can be smoothly produced to promote pulverization of sprays injected from fuel injection ports.

The purpose of the present invention is to provide a fuel injection valve that can achieve sufficient atomization even if the spray angle is narrow. The present invention is a fuel injection valve, in which fuel flowing in from a fuel passage sectionis made to flow so as to diffuse from the center of a fuel diffusion chamberB toward the outer circumference and to flow into a nozzle hole, wherein: the nozzle holecomprises a first nozzle hole, and a second nozzle holeand a third nozzle holethat neighbor the first nozzle holeand are separated therefrom in the circumferential direction of the fuel diffusion chamberB; and, if the distance Lbetween the center of the entry-side opening of the first nozzle holeand the center of the entry-side opening of the second nozzle holeis greater than the adistance Lbetween the center of the entry-side opening of the first nozzle holeand the center of the entry-side opening of the third nozzle hole, the exit-side opening of the first nozzle holeis disposed on the inside of an arrangement circleand on the second nozzle holeside of a line segment

A fuel injection valve includes a valve seatand a valve bodythat cooperate with each other to open and close a fuel passage, a movable elementthat has the valve bodyprovided at one end thereof and has a fuel passage formed therein, a valve seat memberhaving the valve seatformed thereon, an upstream-side communication holethat is located upstream of the flow of fuel and connects the inside and outside of the movable element, and a downstream-side communication holethat is located downstream of the flow of fuel and connects the inside and outside of the movable element, in which a guide section for the valve body, where the valve seat memberand the valve bodyare in sliding contact with each other, is provided downstream of the downstream-side communication holeand in which a fuel passagefor connecting in the center axis direction the upstream side and downstream side of the guide section is provided at the same angular position in the circumferential direction of the movable elementas the downstream-side communication hole. With this arrangement, even if a foreign thing is accidently mixed into the fuel passage during the production process, the foreign thing can be removed with a shorter running-in operation time.

The present invention includes a bobbin having a winding part around which a coil winding is wound, a terminal extending from the bobbin in the axial direction of the bobbin, and a wrapping part which is provided to the terminal and in which a terminal lead wire pulled out from a coil part that is wound around the winding part is wrapped and fused. The terminal lead wire wired between the bobbin and the wrapping part in a state of being in contact with the surface of the terminal. The peripheries of the bobbin, the wiring part of the terminal lead wire and the wrapping part are covered with resin.

Fuel injection valve with resin-covered terminal-lead wire

A fuel injection valve realizing improved circumferential uniformity of swirling fuel is provided. The fuel injection valve includes a swirling chamber having an inner peripheral wall whose curvature is gradually larger from upstream to downstream, a path for swirling which, having a fuel flow-in region formed along a valve axis direction, guides fuel to the swirling chamber, and a fuel injection orifice open into the swirling chamber. In the fuel injection valve, the path for swirling is inclined toward the fuel injection orifice formed on a downstream side of the swirling chamber.

An object of the present invention is to provide a fuel injection valve that is made superior in atomization performance by preventing an influence of minute deformation occurring when an orifice plate is assembled to a nozzle body, thereby reducing fuel leakage from a swirling passage to increase the strength of a swirl flow. The valve includes a valve body openable and closable to jet fuel; a nozzle body having a valve seat surface capable of coming into contact with the valve body to block the jet of fuel; and an orifice plate disposed downstream of the valve seat surface and having a plurality of fuel injection holes adapted to jet swirl fuel. The nozzle body has an end face portion with a downwardly convex inclined surface.

Growing community of inventors

Isesaki, Japan

Takahiro Saito