Topy Kogyo Kabushiki Kaisha

Kiyokazu Niwa

Hiroyuki Takeno

Masahiro Nakajima

Makoto Takagi

Daisuke Nojo

Hirokatsu Niitsu

Akihiro Koishi

Isao Yoshida

Masaki Ohara

Nobuyuki Suga

Go Morishima

Weidong Xue

Yugo Takeuchi

Ryuhei Masuda

Daigo Sugiyama

Kenzo Uchida

Seiji Nobata

The present invention addresses the issue of providing a heat treatment system and a heat treatment method whereby the inner circumference of a cylindrical workpiece can be reliably cooled regardless of the dimensions or shape of the workpiece and productivity can be improved, during quenching of the inner circumference of the cylindrical workpiece. The present invention has: rotating devicesthat rotate the cylindrical workpiece: holding membersthat hold the cylindrical workpieceat a prescribed position; a heating memberthat heats the cylindrical workpiecefrom the inner circumferential surface side; a cooling devicethat injects cooling fluid and cools the cylindrical workpiecefrom the outer circumferential surface side; and a injecting deviceprovided at a position separated from the cooling deviceand which inject the cooling fluid.

Heat treatment system and heat treatment method

An endless track includes an iron link belt, a continuous pad, and a connecting device. The iron link belt includes a link unit assembly constructed of a plurality of link units connected to each other. Each link unit includes a pair of links. The iron link belt may include a plate welded to the pair of links and extending perpendicularly to a direction in which the link unit assembly extends. The continuous pad includes the same number of core metal plates as that of the link units and a single urethane rubber belt covering and being attached to a ground opposing surface of each of the core metal plates. The urethane rubber belt extends continuously over all of the core metal plates. The urethane rubber belt may include a small thickness portion positioned between two adjacent core metal plates. The connecting device connects the iron link belt and the continuous pad.

Endless track and a manufacturing method thereof

A structure for standardizing at least one kind of part of an endless track so that parts can be used for the same size of construction vehicles of a plurality of construction vehicle makers, wherein (a) when the part is a link belt, each of a configuration and a dimension of each link, the pin and the bushing is unified over the same size of construction vehicles of a plurality of construction vehicle makers, and (b) when the part is a shoe including four coupling holes, each of a position, a configuration and a size of the four coupling holes is unified over the same size of construction vehicles of the plurality of construction vehicle makers.

Structure for standardizing parts of an endless track

An endless track includes an iron link belt, a continuous pad, and a connecting device. The iron link belt includes a link unit assembly constructed of a plurality of link units connected to each other. Each link unit includes a pair of links. The iron link belt may include a plate welded to the pair of links and extending perpendicularly to a direction in which the link unit assembly extends. The continuous pad includes the same number of core metal plates as that of the link units, and a single rubber belt covering and being vulcanization-adhered to a ground opposing surface of each of the core metal plates. The rubber belt extends continuously over all of the core metal plates. The rubber belt may include a small thickness portion positioned between two adjacent core metal plates. The connecting device connects the iron link belt and the continuous pad.

A production method of a heat-treated steel member includes the steps of: shaping a steel material of low-carbon boron steel containing about 0.05-0.30% carbon by weight into a predetermined configuration to bc a shaped material; and heat-treating the shaped material, said heat-treating, includes quench-hardening only.

Production method of a heat-treated steel member

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Chigasaki, Japan

Kiyokazu Niwa