Usui Kokusai Sangyo Kaisha Limited

Yasuaki Hashimoto

Masayoshi Usui

Tadahiro Uematsu

Shu Yotsumoto

Kikuo Asada

Shoichiro Usui

Eiji Watanabe

Koichi Hayashi

Tetsuo Ogata

Hiroyuki Nishizawa

Iichiro Seino

Shigeyuki Ishida

Nagahisa Amano

Koji Kurita

Yasuji Sakamoto

Akio Nakane

A heat exchanger having excellent heat exchanging performance is obtainable by a simple production technique and at a low cost. This is achieved by providing a fin member and by increasing heat conductivity between the fin member and a meandering pipe body. Further, the heat exchanger is made compact for high degrees of layout freedom, enabling the heat exchanger to be installed in a tight space. Engagement grooves () are provided in both end surfaces (), which are opposite to each other, of a fin member () in which fins () are parallel arranged. Straight pipe sections () are parallelly arranged, with gaps ()in between, in the engagement grooves () of the fin member (). The straight pipe sections ()are connected at bent sections (). A pair of meandering sections () is arranged opposite to each other with an insertion gap () of the fin member () in between. On () of the meandering sections and the other meandering section () are connected by a connection pipe () to form a meandering pipe main body (). The straight pipe sections () of the one meandering section () are arranged in the engagement grooves () in the one end surface () of the fin member () inserted and arranged in the insertion gap () between the one meandering section () and the other meandering section () of the meandering pipe body (), and the straight pipe sections () of the other meandering section () are arranged and fixed in the engagement grooves () in the other end surface ().

Heat exchanger

A common rail a diesel engine includes a branching connection body firmly fixed on common rail body by friction welding. A fronting face of the branching connection body to be fixed on the common rail body by friction welding is in the shape of a cone whose center part is slightly projected and whose peripheral part is a gentle cone face.

Common rail for diesel engine

A joint structure connects a diverging branch pipe to a fuel rail for an internal combustion engine. The fuel rail is stainless steel or steel with rust prevention processing on at least the inner face. The diverging branch pipe is a double pipe with inner and outer pipes. The inner pipe has excellent rust preventing ability with respect to fuel on its inner face in comparison with the outer face of the outer pipe. The inner and outer pipes are connected by a nut for fastening through a joint fitting. A connecting seal portion of the diverging branch pipe and the joint fitting has rust preventing ability equal to that of the inner circumferential face of the diverging branch pipe. An entire liquid contact portion, including a seal face of the diverging branch pipe with respect to the fuel is covered with the inner pipe.

Joint structure of diverging branch pipe in fuel rail for internal combustion engine, diverging branch pipe and manufacture method of its diverging branch pipe

It is an object of this invention to obtain a heat conduction pipe superior in corrosion resistance as well as heat exchange efficiency between fluid flowing respectively through an inside and an outside for great heat radiation property and endothermic characteristics. It is also object of this invention to form the heat conduction pipe superior in the corrosion resistance as well as the heat radiation property and endothermic characteristics at inexpensive price. To achieve the above, at least single resin coating layer is formed on an outer circumferential surface of a metal pipe, a metal fin member is spirally wound on an outer circumferential surface of the resin coating layer with a side end surface the metal fin member in contact. The winding contact portion is made to encroach a surface of the resin coating layer to form the heat conduction pipe.

Heat conduction pipe externally covered with fin member

A method of manufacturing a thick-walled small diameter pipe by repeating a process comprising a pipe extension process and a heating process on a pipe to be processed plural times, wherein a machining process on the inner circumferential surface of said pipe to be processed is performed prior to the pipe extension process in the final cycle of said process or a process near the final cycle to remove a black skin layer, cracks and puckers, providing smooth inner surface and excellent proof pressure.

Method of manufacturing thick-walled small diameter pipe

A device for cutting the inner circumferential surface of a thick-walled small diameter pipe comprising a setting means for inserting a core bar having a cutting blade on one end thereof into a pipe to be processed, a rotating means for rotating said pipe to be processed set by the setting means about the axis thereof relative to said core bar, a feed means for cutting the inner surface of said pipe to be processed with said cutting blade while pulling the core bar which is securedly held at the other end thereof relative to said pipe to be processed, and a control means for controlling each of said means, providing a smooth high quality inner surface having excellent proof pressure against internal pressure.

Growing community of inventors

Izu, Japan

Yasuaki Hashimoto