The Yokohama Rubber Co., Ltd.

Nobuaki Kuribayashi

Susumu Hatanaka

Gang Hou

Kazuto Yamakawa

Jiro Watanabe

Shusaku Tomoi

Hiroshi Shintani

Hiroaki Shibano

Hiroyuki Wakamatsu

Ikuma Yusa

Naoshi Yamaguchi

Mie Okura

Ryuhei Suzuki

Yuki Mizutani

Tomohide Saita

Provided is a piping system for an air conditioner installed in a vehicle that can achieve appropriate weight reduction while ensuring appropriate pressure resistance as the piping system as a whole. A circulation path that connects component devices of an air conditioner () in an annular shape to circulate a refrigerant (C) is formed by each pipe body extending between the component devices. At least one of the pipe bodies includes: a resin hose () embedded with a non-metal reinforcing material () or a resin pipe () embedded with a non-metal reinforcing material (), and the resin pipe bodies (), () are employed in 50% or more of a total length of each of the pipe bodies constituting the circulation path.

Piping system for air conditioner installed in vehicle

A holding portion having a diameter larger than that of a cavity is formed in communication with the cavity, in an area of a two-part type mold, the area including a portion corresponding to an annular groove. Subsequently, an insert member formed in a cylindrical shape and provided with, on an outer circumferential surface, the annular groove having no step in a groove surface is fitted to the holding portion, and then the mold is closed. On an inner circumferential surface of the insert member, a surface treatment layer having a surface roughness rougher than those of other portions of the insert member is formed. Molten resin is injected into the cavity; thereafter, an assist material is injected into the cavity to mold the resin into a desired pipe body. Then, the insert member and the pipe body are integrated along with curing of the resin.

Method for manufacturing resin pipe

Two molded articles having a cylindrical two-piece split shape is formed by forming two primary cavities in a desired shape with molds assembled together and injecting a molten primary resin into the two primary cavities. An assist material is injected into a secondary cavity into which a molten secondary resin is injected in a state where the two molded articles are located opposed to each other via a space therebetween and internally fitted into one secondary cavity formed by the molds that are assembled together by shifting the positions. A flange portion having any desired shape is disposed on an outer circumferential surface of a resin pipe in a two-layer structure in which an inner surface layer formed of the cured secondary resin is integrated with an outer surface layer formed of the two molded articles. Thus, a portion having any desired shape is easily manufactured on the resin pipe.

Method of manufacturing resin pipe

Growing community of inventors

Hiratsuka, Japan

Nobuaki Kuribayashi