Toyoda Gosei Co., Ltd.

Norio Watanabe

Kenichi Mitsui

Koji Ito

Naomi Nakashima

A plastic pipeis a pipe utilized in a cooling water systems, and the bonding strength of each layer is heightened, and resistance capabilities of the antifreeze solution are enhanced. The plastic pipecomprises an inner layerformed from either a polyphenylene sulfide or an aromatic polysulfide, which is a denatured substance thereof, an intermediate layerwhich is a mixture of PPS resin and a polyamide resin, and an outer layerincluding a polyamide resin. The inner layeris formed such that permeation of an antifreeze, which has mainly ethylene glycol, is less than 3.0 g/mper day. The resistance capabilities of the antifreeze solution can be achieved by making the thickness of the inner layer0.2 mm or greater.

Plastic pipe and manufacturing method therefor

A hose connecting assembly of the present invention ensures a tight seal even when a hose,is bent and laid out in a narrow space and repeatedly is subject to vibrations under a low-temperature condition. The hose connecting assembly includes a connection tube,, which is pressed into the hose,. The hose,is designed to have an inner diameter change rate Dc of no greater than 23% under application of an inner pressure of about 0.49 MPa. Ring-shaped projections,, and,are formed on the outer circumferential surface of the connection tube,. The ring-shaped projections,, and,are designed to make a diameter expansion rate T, which is defined by an inner diameter d1 of the hose,and an outer diameter D2 of the ring-shaped projections,, and,, at least 25%. A hollow cylindrical end,is further formed on an end portion of the connection tube,. It is preferable that the hollow cylindrical end,has a length of at least about 3 mm.

Hose connecting assembly

A hose connector connects a hose with a pipe which projects through a mounting member, and includes a connector body, an intermediate member and a grommet. The connector body includes a hose connector member, and a pipe connector member. The intermediate member is detachably engaged with the connector body, and includes a second engager and an engager claw. The intermediate member can be assembled with the connector body by simply engaging the second engager with the first engager of the connector body, and can be assembled with the mounting member by simply engaging the engager claw with a mounting hole of the mounting member. The grommet is held on the intermediate member so as to seal a periphery of the mounting hole of the mounting member. The hose connector enables not only to connect a hose with a pipe by snap action, but also to project a pipe through the mounting member by a reduced length.

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Aichi-ken, Japan

Norio Watanabe