Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi, Ltd.

Masato Higuma

Kenichi Gunji

Keiji Kawahara

Atsushi Sekine

Toshio Hori

Kenichi Nakayama

Yujiro Kaneko

Akihiro Sato

Takahiro Shimura

Satoshi Hirano

Hideto Yoshinari

Hideki Fukushima

Shinji Hiramitsu

Atsushi Koshizaka

Yasuhiko Kimura

Keiichi Uraki

Yuta Yanagisawa

Ryohei Matsutake

Toshifumi Sagawa

Hiroshi Tokuda

Tsuneyoshi Inoue

Yasuyuki Tanaka

Yuki Sugiyama

An object of the present invention is to suppress variations in an angle of a shoulder part of a segment coil to improve easiness in inserting segment coils in a stator core. A stator of an electric motor according to the present invention includes a stator corein which a plurality of slotsare formed, and a plurality of segment coilsof U shapes inserted respectively in the plurality of slots The segment coilincludes a shoulder partand a shoulder partthat are bent to form a U shape. In a front view of the U shape, a press markis formed on the shoulder partand on the shoulder part, the press mark being a dent sinking in a front-to-rear direction, from a front surface of the shoulder partand from a front surface of the shoulder part. The press markis formed also on a back surface of the shoulder partand on a back surface of the shoulder part

Stator of electric motor and manufacturing method for stator of electric motor

An object of the present invention is to provide a working method of an orifice, which has excellent working accuracy and high productivity in order to work an inclination portion (tapered portion) on the entire circumference of an inner wall of an orifice. Therefore, a working method of an orifice includes a first step of forming an orifice holein an orifice forming member, a second step of pressing a downstream end surface of the orifice forming member in which the orifice holeopens, in a direction toward an upstream side of the orifice holeby a punchhaving a cutting blade portionlarger than a cross section of the orifice hole. The second step causes a material of the orifice forming member to flow from an entire circumference at the downstream end portion of the orifice holeto an inside of the orifice holeto form a cross-sectional area reduction portionin which a cross-sectional area of the orifice holeis reduced from an upstream side to a downstream side.

Working method of orifice and fuel injection valve

Each of a plurality of power semiconductor module includes a can-type cooling case that is formed with a plate spring portion that generates compressive stress in the semiconductor circuit unit, an adjustment portion that is deformed to adjust elastic deformation of the plate spring portion, and a sidewall portion to which the plate spring portion and the adjustment portion are joined.

Power semiconductor module

A friction stir welding structure is comprised of a first and a second member integrated into one piece by friction stir welding, and in which a thin section is formed along the friction stir weld section on at least one of either of the first and the second member.

Friction stir welding structure and power semiconductor device

A power semiconductor module includes: a circuit body having a power semiconductor element and a conductor member connected to the power semiconductor element; a case in which the circuit body is housed; and a connecting member which connects the circuit body and the case. The case includes: a first heat dissipating member and a second heat dissipating member which are disposed in opposed relation to each other while interposing the circuit body in between; a side wall which joins the first heat dissipating member and the second heat dissipating member; and an intermediate member which is formed on the periphery of the first heat dissipating member and connected to the side wall, the intermediate member including a curvature that is projected toward a housing space of the case.

Power semiconductor module and power conversion device

There is provided a coupling process whereby two components can be coupled together at high positional precision regardless of precision of a single component. A softer componentof two componentsto be coupled together is subjected to shearing by a cornerof a harder componentwhile respective parts of the two components, positioning of the respective parts being required, are kept as-positioned state with the use of a mandrel, and a side face of the corneris fitted to a sheared surfaceof the softer componentduring shearing in progress, subsequently coupling the two componentstogether at a fitting surface by plastic coupling, press-fitting, or welding.

Fuel injection valve and method for coupling two components together

It is an object of the present invention to enhance the orifice design freedom and easy machine ability in a fuel injection valve in which orifices are formed by press-working. In a machining method for forming an orifice in a fuel injection valve by operating a punchin an axial direction inclined relative to a normal direction perpendicular to a tangent plane of a curved surface portionor relative to a perpendicular direction perpendicular to a slant surface of a slant surface portion, the machining method comprises a first step of operating the punchalong an axispre-shifted in parallel from an orifice axisand pressing an orifice plateto form a recess, a second step, after the first step, of shifting an axis of the punchto the position of the orifice axisand forming a recess in a bottomof the recessformed in the first step, the recess formed in the second step being deeper than the recess, and a third step of forming an orifice in a bottom of the orifice formed in the second step.

Method of machining orifice and press-working method

Disclosed herein is a method for processing an orifice capable of processing recessed portions and orifices, each having a unique hole diameter different from each other, to high positioning accuracy and in a short time. A press includes: a B-axis angle indexing devicedisposed on a base, the B-axis angle indexing deviceincluding a table B; an A-axis angle indexing devicedisposed on the table B, the A-axis angle indexing deviceincluding a table A; a chuckdisposed on the table A, the chuckfor holding a work; a base Zdisposed on a base, the base Zbeing operable in an axis Z-direction; a base Xdisposed on the base Z, the base Xbeing operable in an axis X-direction; a punch holding portiondisposed on the base X, the punch holding portionbeing operable vertically in an axis Y-direction; and a plurality of punchesheld on the punch holding portion in parallel with the axis Z. The press is used to perform a pressing cycle at a desired position by changing a posture of the work and moving the punch in the Z-direction continuously using punches having different leading end diameters and shapes with the work held in the chuck.

Method of processing orifice

A fuel injection valve with reduced adhesion of deposits to a fuel injecting portion and superior in durability is provided. Also provided is a method for machining multi-orifice type fuel injecting portions easily, less expensively, in good surface roughness, in high productivity, and with few variations in shape, accuracy and surface roughness, using inexpensive equipment. The surface roughness of fuel injecting portions comprising orifices and apertures is made Rz 2 &#x3bc;m or less. Apertures are formed by press working so as to each have a plastic-worked surface of Rz 0.2 &#x3bc;m or less in surface roughness and then orifices are formed in the bottoms of the apertures so as to have a plastic-worked surface of Rz 0.2 &#x3bc;m or less in surface roughness. Further, when abrasion resistance of the nozzle is required, the fuel injecting portions are finished to a surface roughness of Rz 2 &#x3bc;m by quenching.

Fuel injection valve and machining method for nozzle

A fuel injection valve comprises a convex portion prominently formed on an outer end surface of a nozzle body, stepped recesses each of which has plural steps formed by press forming on the convex portion, and multi orifices as fuel nozzle holes formed by press forming so that an outlet of each of the orifices is located at a bottom face of each of the stepped recesses. Furthermore, the fuel injection valve has plural sets each of which comprises one of the stepped recesses and the relevant orifice, the orifices incline to each other, and a step on a downstream side in each of the stepped recesses has a larger diameter than a step on an upstream side thereof.

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Hitachinaka, Japan

Masato Higuma