著者

吉川 文隆 矢野 昭彦 内田 幸宏 藤田 健二 川添 強 佐田 裕之

出版者

The Japan Institute of Marine Engineering

雑誌

Marine engineering : journal of the Japan Institution of Marine Engineering = マリンエンジニアリング : 日本マリンエンジニアリング学会誌 (ISSN:13461427)

巻号頁・発行日

vol.43, no.1, pp.123-129, 2008-03-01

参考文献数

7

被引用文献数

1

---

Propeller shaft diameter of ferries becomes larger in conjunction with requirements of higher vessel's speed and CPPs (controllable pitch propellers) . Thus, it may lead into a tendency to reduce the life duration of stem tube bearing under seawater lubrication. Wear of the propeller shaft sleeve, i.e. bronze alloy, is typically greater than that of the rubber bearings, with triangularly shaped craters appearing on the sleeve surface.<BR>In this paper, we describe the investigation of used sleeve sample taken from an actual vessel, as well as the wear characteristics of bronze alloys conducted under the corrosive wear condition which is equivalent to actual ferry service. The results indicated that corrosive wear was the main cause of sleeve wear. Comparing between the amount of wear in seawater and the one in distilled water, the influence of corrosion on sleeve wear was found to be substantial. Additionally, the craters are considered to be formed by the action of erosion corrosion

著者

吉川 文隆 内田 幸宏 藤田 健二 矢野 昭彦 川添 強 佐田 裕之

出版者

The Japan Institute of Marine Engineering

雑誌

マリンエンジニアリング (ISSN:13461427)

巻号頁・発行日

vol.43, no.2, pp.258-264, 2008

被引用文献数

1

---

The previous report described the corrosive wear on propeller shaft sleeves, made of bronze, in seawater-lubricated stem tube bearings. Accompanying is the occurrence of craters on the sleeve surface due to the action of erosion corrosion. As a countermeasure, based on the mechanism, this second report will provide the development of a catholic protection bearing, what prevents corrosion of the sleeve surface and reduces wear. Using anodes installed in some of the water channel grooves of the rubber bearings, this method is characterized by intermittent protection at best, and protection conditions were investigated by means of fundamental testing and using bearings of 140mm in diameter. As a result, a current density of 8A/m<SUP>2</SUP> was found to protect the sleeve from corrosive wear. Cathodically protected bearings were also applied to bearings of 500mm in diameter and equipped for a ferry vessel. The results are presented here in terms of bearing design, trial running, and successful reduction of wear during actual in-service use.