Hiroki MARUYAMA

Doshisha University

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Co-Authors

Naohisa Tsukamoto

Mitsubishi Plastics (Japan)

Hiroshi Mimura

Shizuoka University

Naohisa TSUKAMOTO

Akira Shirakawa

University of Electro-Communications

Noriteru Nishida

Nagasaki University

Jes Broeng

Technical University of Denmark

Ken‐ichi Ueda

University of Electro-Communications

Christina B. Olausson

NKT Holding (Denmark)

Jens K. Lyngsø

NKT Holding (Denmark)

Hiroshi Ozeki

Chiba Institute of Technology

Cooperative Institutions

Fermi National Accelerator Laboratory

177

Linde (United States)

176

Michigan State University

170

Cryogenic Industries (United States)

167

European Organization for Nuclear Research

166

Cryomagnetics (United States)

150

Pediatric Nephrology of Alabama

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Osaka University

Chinese Academy of Sciences

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Investigation about the prevention of tooth profile change of plastic gear (3rd report, Abrasion and tooth profile change of addendum-modification nylon gears)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1985)

Naohisa TSUKAMOTO Hiroki MARUYAMA Jiasun SHI

動力を伝達するナイロン歯車の運転経時に伴う歯形変化の防止法として前報までに二つの方法を提案し,その効果を実験で確認してきたが,本報ではこれらよりも簡単に行なえる方法としてナイロン歯車を正転位することを提案した.正転位歯車は歯元の歯厚が増し歯がたわみにくくなる反面,歯のすべりが大きくなるので本報では各種の転位係数のもとでナイロン歯車の歯の摩擦などを調べ歯形変化の防止法としてこれが有益な方法であるかを検討した.

Addendum

Abrasion (mechanical)

10.1299/kikaic.51.2602

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A few confirmations on the operation of plastic gears. 1st Report. Operation between plastic gear.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1987)

Naohisa TSUKAMOTO Hiroki MARUYAMA Noriteru Nishida

When a plastic gear is used, there may be a problem as to which is better : intermeshing with plastic gears, or intermeshing with a plastic gear and a steel gear. In the former case, the wear is small since the coefficient of friction of the former is generally smaller than that of the latter. On the other hand, in the latter case, the temperature at the plastic gear becomes lower than in the former case, because the generated heat in the plastic gear conducts to the steel gear with good thermal conductivity, and it dissipates from the steel gear. This is advantageous for the plastic gear since it has a great defect in resistance to heat. In these ways, each intermeshing has its respective merits. In order to further study it in detail, we operated the plastic gear in both intermeshings and investigated the wear of the tooth, the change in tooth form, the temperature at the tooth, and the like.

Non-circular gear

Involute gear

Gear tooth

10.1299/kikaic.53.2331

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Plastic Gears in Vacuum. 2nd Report. Limiting PV-Value and Wear of Plastic Gears in Vacuum.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1994)

Naohisa Tsukamoto Hiroki MARUYAMA

In the first study, the change of dimensions of nylon, polyacetal and polycarbonate gears in vacuum (degree of vacuum : 10-3 Pa) was examined. As a result, it was found that in each plastic gear, the amount of change of dimensions in vacuum was not a value which poses a practical problem. Therefore, in this succeeding study, at the same degree of vacuum as that in the first study, operating tests were carried out on five gear combinations, namely, both nylon gears, both polyacetal gears, nylon gear and polyacetal gear, nylon gear and steel gear, and polyacetal gear and steel gear, and the limiting PV-values and the wear of plastic gears in the combinations were elucidated.

Limiting

Polycarbonate

Nylon 66

Nylon 6

10.1299/kikaic.60.3187

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Study on business continuity capability by cooperative operation of photovotaic and battery energy storage system

Hiroki MARUYAMA Hideo Ishii Yasuhiro Hayashi Hajime Onojima Yoshikane Kojima

In this study, as a new index of facilities, business continuity capability on occasion of an energetically isolated operation, was defined and evaluated for the facility with a rich amount of resources such as private generators, a battery energy storage system and a PV generation system. A methodology was proposed to evaluate a duration during which the facility is self- sustaining regarding energy use. An effect of reducing the capacity of PV or battery was also examined.

Battery capacity

Battery storage

10.1109/appeec.2015.7381054

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Effect of reducing friction of polyacetal in gears. 2nd report, Fluororesin and mineral-oil-filled polyacetal gear.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1991)

Naohisa Tsukamoto Hiroki MARUYAMA Hiroshi Mimura

Since the abnormal wear at the dedendum of a gear made of plastic with a low coefficient of friction can prevented, polyacetal filling 10 % of fluororesin was used as a gear to reduce the coefficient of friction in the previous report. Although the gear showed high resistance to friction, it had shortcomings in that the price of the gear was high due to the high content of fluororesin, and fluororesin was hard to release from the mold. Mineral oil was, thefefore, substituted for a part of fluororesin in the polyacetal gear. This report presents the characteristics of the fluororesin and mineral-oil-filled polyacetal gear, such as the wear of the gear, the temperature of teeth and the change of the tooth profile determined by a practical test.

Mineral oil

Coefficient of friction

Oil immersion

10.1299/kikaic.57.236

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Model Order Reduction of Cage Induction Motor with Stator and Rotor Failures Based on Multiport Cauer Ladder Network Method

Y. Takenaka Hiroki MARUYAMA Yasuhito Takahashi Koji Fujiwara K. Sugahara

Squirrel-cage rotor

10.1109/cefc61729.2024.10585957

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An examination of body thickness of plastic gears.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1990)

Naohisa Tsukamoto Hiroki MARUYAMA Yoichi EBATA

In the case of cast gears, the dimensions of various parts of gear bodies are mostly designed on the basis of empirical data. However, for plastic gears, such empirical design data are few: accordingly, even though the indicated transmitting power is the same, large difference is observed in the thickness of gear bodies and others among different to manufacturers. Therefore, in this study, as one procedure of examining the effect of the difference in the thickness of gear bodies such as these on the operation of the plastic gears for transmitting power, operation tests were carried out by using various thicknesses of disks and of rims in disk type plastic gears, and the relationships of the change of these thickness with the life, wear, change of tooth profile and the other characteristics of plastic gears were examined.

10.1299/kikaic.56.3374

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A study on the wear of plastic.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C (1988)

Naohisa Tsukamoto Hiroki MARUYAMA Hiroshi Matsui

When a plastic material is applied to a rubbing surface, an important factor in designing a measure to counter its wear is the degree at which the surface roughness in the other material should be fixed. In the case of plastics, being softer than steel, the surface roughness of the other material a specially effects the wear. In this paper, using a combination of MC nylon and steel, the effects of hardness and surface roughness of steel on the wear of MC nylon were studied for the purpose of obtaining data to estimate the optinal surface roughness in the other material.

Rubbing

10.1299/kikaic.54.2362

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Actively Doped Solid Core Photonic Bandgap Fiber

Optical Fiber Communication Conference (2010)

Jes Broeng Christina B. Olausson Jens K. Lyngsø Hiroki MARUYAMA Ken‐ichi Ueda

Solid photonic bandgap fibers offer distributed spectral filtering with extraordinarily high suppression. This opens new possibilities of artificially tailoring the gain spectrum of fibers. We present record-performance of such fibers and outline their future applications.

Photonic bandgap

Microstructured optical fiber

10.1364/ofc.2010.owk5

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23288 Effect of lateral prestress and size on seismic performance of pile cap : Part1 Compatibility with test results

Summaries of technical papers of annual meeting (2015)

Hiroki MARUYAMA Ryo Yamasita Yasuji Shinohara

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