Toyo Kogyo Co., Ltd.

Jtekt Corporation

Mitsubishi Heavy Industries Limited

Noritaka Watanabe

Hiroaki Suzuki

Akira Yamashita

Masayuki Shimizu

Kazushi Numazaki

Tsukuo Ishitoya

Chihiro Uchimura

Yoshinori Imoto

Haruki Hitomi

Michiya Uchida

Masahiro Fujisaka

Provided is an internal gear pump. The shape of any one of a plurality of external teeth and a plurality of internal teeth of the pump is formed on the basis of formulae (1)-(5).&#xb7;cos &#x3b8;,&#x2003;&#x2003;Formula (1):=()+1/4{1&#x2212;cos(2&#x3b8;)},&#x2003;&#x2003;Formula (2):=1/4{&#x2212;2&#x3b8;+sin(2&#x3b8;)},&#x2003;&#x2003;Formula (3):&#xb7;cos &#x3b8;,&#x2003;&#x2003;Formula (4):&#xb7;sin &#x3b8;&#x2003;&#x2003;Formula (5):.

Internal gear pump

This internal gear pump accommodates: a ring-shaped internally toothed gear provided with internal teeth, and an externally toothed gear provided with external teeth which internally mesh with the internal teeth of the internally toothed gear, said externally toothed gear being eccentrically disposed inside the internally toothed gear. The number of internal teeth is one greater than the number of external teeth. In any one of the external teeth and the internal teeth, a tooth tip section and a meshing section are formed by a curve having one continuous curvature. The curve is formed by an equation with which the maximum curvature is at the apex of the tooth tip, and the curvature gradually reduces towards the tooth bottom section.

An electromagnetic valve includes: a valve main body including an inlet and an outlet of a fluid; a valve body to be seated on a valve seat provided between the inlet and the outlet; a movable iron core separating the valve body from the valve seat to communicate the inlet with the outlet; and a fixed iron core attracting the movable iron core by energization of a coil to axially drive the movable iron core. The valve main body includes an insertion hole into which a guide member is inserted and a stopper portion to stop the guide member biased by a pressure of the fluid. The guide member includes a sliding hole in which the movable iron core is axially movable, and is arranged in the insertion hole in a slidable manner with respect to the valve main body to be biased by the pressure of the fluid.

Electromagnetic valve

A safety valve includes a cylinder having an open end and a plug for closing the open end with a hermetic seal. The interior of the cylinder communicates with a high-pressure gas passage. The cylinder is deformed as a function of gas pressure in the high-pressure gas passage to widen the open end. This allows gas in the high-pressure gas passage to escape and thus prevents the gas pressure from increasing beyond an acceptable level.

Safety valve and electromagnetic valve

An electromagnetic valve includes a valve body, a valve element, a movable iron core, a guide tube, a coil, a yoke, and a fixed iron core. The valve body includes a fluid flow path. The valve element is movable and seated on a valve seat provided in the fluid flow path of the valve body. The movable iron core moves the valve element with respect to the valve seat. The guide tube is cylindrical and movably supports the movable iron core. The coil is mounted on an outer periphery of the guide tube. The yoke covers an outside of the coil and forms a magnetic circuit. The fixed iron core is provided facing the movable iron core and attracts the movable iron core by energization of the coil. The valve body is coupled to the guide tube on one opening end side of the guide tube, and the fixed iron core is provided on an other end side of the guide tube with a clearance spaced from an inside of the guide tube. One end of the yoke is coupled to the fixed iron core, and the valve body is coupled to an other end of the yoke.

Growing community of inventors

Okazaki, Japan

Noritaka Watanabe