Hitachi Metals, Ltd.

Jidosha Kiki Co., Ltd.

Hitachi, Ltd.

Seiji Okazaki

Koji Hatanaka

Kenji Maruta

Takashi Aota

Tetsuo Nakazawa

Hirohisa Suwabe

Mitusuke Masaka

Junji Sakai

Syogo Morimoto

Takatoshi Tanigawa

Ryoji Takahashi

Sachio Ogasawara

Makoto Imaizumi

Shigeki Yokoyama

A glow plug for diesel engines in which a ceramic heater is supported, with the one end thereof cantilevered toward the outside, by the tip of a hollow holder ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of the U-shaped heating portion, both being formed integrally by an electrically conductive ceramic material. The outer periphery of at least one of the leads is bonded and held in the holder via an insulating layer. The rear end of the other of the leads is connected by a metallic lead wire to an external connection terminal. The ceramic heater and other component members are bonded integrally by a bonding material containing a reactive metal.

Glow plug for diesel engines

Sintered body of conductive sialon and heating element made thereof

A diesel engine glow plug having an elongated hollow electrically conductive holder, which holds a rod-like ceramic heater at one end thereof such that one end of the heater extends outside the holder. An external connecting terminal is positioned in the other end of the hollow holder and electrically insulated from the hollow holder. The ceramic heater is a U-shaped heating element with a pair of parallel lead portions made of a resistive ceramic material extending backward from both ends of the U-shaped heating element and arranged such that the outer surfaces of the lead portions are held by the distal end of the holder through electrical insulating layers between the inner surface of the holder and the outer surface of the lead portions. The rear end portions of the lead portions are electrode extraction ends wherein the electrode extraction end of one lead portion is electrically connected to the external connecting terminal through a conductive material and the electrode extraction end of the other lead portion is connected to the metal pipe which itself is electrically connected to the holder through a conductive material.

Glow plug for diesel engine

A glow plug for a diesel engine includes a hollow holder, and a ceramic heater made of SiAlON extending through a distal end portion of the hollow holder and held by it. The ceramic heater is provided with a U-shaped heating element and a pair of lead portions extending backward from both ends of the U-shaped heating element and parallel to each other. The heating element and the pair of lead portions are integrally made of a resistive ceramic material. One of the lead portions is coupled to one end of an electrically conducting flexible wire, the other end of the wire being coupled to an external connecting terminal. A ration .epsilon.(.dbd.SH/SL) of cross-sectional areas SH of the U-shaped heating element to cross-section areas SL of the lead portions falls within the range of 0.15.ltoreq..epsilon..gtoreq.0.6.

Diesel engine glow plug having SiALON heater

In a mold to be hardened by a CO.sub.2 gas, a mold binder material comprising a combination of polymers containing carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and resins of polyvinyl alcohol group, and at least one of sodium salt of gluconic acid and polyhydric alcohols or a mold binder material comprising a combination of polymers having carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and at least one of sodium salt of gluconic acid and polyhydric alcohols is provided. By use of the present binder material, the following various effects can be obtained: (1) easy preparation of mold sand, (2) easy removal of the binder material by water washing even if bodies or clothes are fouled by the binder material, (3) a longer working time of mold sands, (4) a higher mold strength, (5) an improved working atmosphere at shaping of the mold, (6) an improved production efficiency of molds, (7) the desired mold strength being obtained with a smaller amount of CO.sub.2 gas used, etc.

Mold binder material

Growing community of inventors

Saitama, Japan

Seiji Okazaki