Nippondenso Co., Ltd.

Other

The Furukawa Electric Co., Ltd.

Toshihiro Imai

Ken Yamamoto

Norimasa Baba

Norihide Kawachi

Michiyuki Saikawa

Kazutoshi Kusakari

Tomoaki Kobayakawa

Takeshi Okinotani

Tokuo Shirai

Shingoro Fukuoka

Hiroyuki Fujii

Hitoshi Ichikawa

Toshiya Kouga

A heat exchanger includes a first tube in which water flows and a second tube in which refrigerant flows, and performs heat exchange between water and refrigerant. The first tube and the second tube are bonded to each other by brazing at joint surfaces thereof such that water flow crosses refrigerant flow perpendicularly. The joint surface of the first tube is divided into several surface regions by grooves. Accordingly, the joint surface of the first tube can be brazed to the joint surface of the second tube uniformly.

Heat exchanger and method for manufacturing the same

A block of material used for making a movable core for a fuel injector is prepared from a bar or coil of material by clamp shearing using a working fluid containing an extreme-pressure additive (such as sulfur, chlorine or phosphorus). The additive reacts with the material to form a protective layer (of e.g. sulfide, chloride or phosphate) on the cut-off surface of the block. The block is cold forged so that its cut-off surface having the protective layer may form a wall defining a fuel passage. The layer prevents the material from being seized with any die or punch used for cold forging.

Method of manufacturing a fuel injector core

A multi-hole tube extrusion die comprises a female mold die having a flat opening and a mandrel having comb-teeth-like molding portions arranged in the opening. A heated material is extruded between the female mold die opening and the comb-teeth-like molding portions of the mandrel to form a tube having a multi-plicity of holes. An interval between each of the comb-teeth-like molding portions at the opposite ends of the mandrel and the comb-teeth-like molding portion adjacent to the outermost comb-teeth-like molding portion is set to be smaller than an intervals between the female mold die opening and each of the outermost comb-teeth-like molding portions and to be larger than an interval between adjacent ones of the other comb-teeth-like molding portions. Additionally, the outermost comb-teeth-like molding portions are larger in width than the other comb-teeth-like molding portions. Therefore, a lateral pressure difference acting on each of the outermost comb-teeth-like molding portions due to flows of the material is reduced, and the rigidity of outermost comb-teeth-like molding portions is increased, thereby preventing deformation of the die and enabling prolongation of the life of the die as well as a highly accurate extrusion.

Die for extrusion of multi-hole tube and multi-hole tube made with the

Growing community of inventors

Nagoya, Japan

Toshihiro Imai