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Development of Horizontal Water Cooled Diesel Engine to Achieve High Power Density

KUBOTA Corporation-Yoshinobu Komai, Yusuke Takashima, Tsukasa Fujiwara, Hisao Okamoto, Minoru Kawahara
Published 2018-10-30 by SAE International in United States
The horizontal water cooled diesel engine has a structure including all component parts such as a fuel tank that are necessary to drive engine, and is often a single cylinder engine. It is mounted on many applications such as power tiller and water pump because of high general versatility of installing owing to belt drive. It has a simple structure because of single cylinder, and is active mainly in Southeast Asia. At the same time, the market requires this type of engine higher power while a compact structure is also required from the viewpoint of easy to supply and use. In other words, “High power density” that is improving the output per body size has been required. We have responded to the demand of “High power density” by increasing output without changing the engine size. In order to keep the engine size, we have been enlarging displacement by using our peculiar stroke-up expertise and original bore-up contrivance. In addition to those techniques, we introduced analytic technology for early approach to optimal solution. While we had…
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Study on the Prevention of Face-Plugging of Diesel Oxidation Catalyst (DOC)

KUBOTA Corporation-Kota Nakano, Hiroaki Okano, Katsushi Inoue
National Institute of AIST-Akira Obuchi
Published 2018-10-30 by SAE International in United States
In order to meet the reinforcement of worldwide environmental regulations, latest diesel engines for industrial machinery are required to reduce the emission of harmful gases such as carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx), and particulate matter (PM). For this reason, some of the diesel engines are equipped with exhaust gas treatment devices such as diesel particulate filter (DPF), diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR) catalyst. However, applications of such industrial diesel engines bring about excessive back pressure increase and deterioration in the performance of the catalysts when continuous operation is performed at low load conditions: soot accumulates on the inlet faces of DOC and DPF, causing face plugging issues. To resolve this issue, it is necessary for the system to be equipped with certain additional devices to raise an exhaust gas temperature to a high level enough to burn out the soot [1]. In this research, in order to solve the face plugging at the inlet of DOC without using such an additional equipment, we studied the cause of…
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Development of the New KUBOTA M40 Series Tractors

KUBOTA Corporation-Kenichiro Tsuji, Tomeo Umemoto, Tadahito Suzui, Takeshi Nishibeppu, Koichi Hasegawa
Published 2007-10-30 by SAE International in United States
Since 1995, KUBOTA has been marketing mid-sized agricultural tractors ranging from 33.6 to 59.7kW PTO horsepower. The positive features are the compact body size, superior-mobility and versatility in agricultural, homeowner and landscape operations.In 2006 a new generation of M Series Tractors was introduced for the US market. The updated tractors have incorporated all of the positive features from the previous models. In addition, Kubota has pursued operator-comfort in the development of the new models. Focusing on operator-comfort and visibility has led to an all new cabin frame and a new air conditioner system with optimized air flow. This paper introduces the features and techniques used to develop the new cab tractors.
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Japan Land Engine Manufacturers Association's Voluntary Regulation of Exhaust Emissions from Compression Ignition Engines of Less than 19kW

KUBOTA Corporation-Yoshiharu YAMAGUCHI
FUJI HEAVY INDUSTRIES LTD.-Hideki TANAKA
  • Technical Paper
  • 2005-32-0038
Published 2005-10-12 by Society of Automotive Engineers of Japan in Japan
Japan Land Engine Manufacturers Association (LEMA) will apply its own voluntary regulation of the exhaust emissions of hydro-carbons (HC), oxides of nitrogen (NOx), and carbon monoxides (CO) from compression ignition engines of less than 19kW produced by LEMA member companies for domestic market. This paper introduces the progress of this voluntary regulation, explanation of the contents, and member organizations' technologies for compression ignition engines of less than 19kW.
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Combustion and exhaust emissions of a SI engine fueled with methanol reformed gas and hydrogen

KUBOTA Corporation-Masami MAEDA, Tadao YAMATO, Yasuaki SHIOMI, Kouichi SUGAHARA
  • Technical Paper
  • 978471
Published 1997-10-27 by Society of Automotive Engineers of Japan in Japan
This paper studied suitable methods to use reformed gas (H2 67% and CO 33% mixed), hydrogen as alternative fuels for an internal combustion engine. Both the internal mixture formation and the external mixture formation were studied. PIMGI (Port and Intake Manifold Gas Injection) engine of the external mixture formation was equipped with two electro-magnetic injectors per cylinder. One injector was installed in the intake manifold for the homogeneous mixture and the other was installed near intake port for stratified charge. The fuel pressure for PIMGI was 0.8 MPa. In GDIC (Gas Direct Injection into Cylinder) engine of the internal mixture formation, the gas injector driven by the hydraulic pressure was installed in the cylinder head. The fuel pressure for GDIC was 5.0 MPa. In the GDIC, the fuel was injected early after intake valve was closed because the gas pressure was relatively low for direct injection. Brake mean effective pressure of GDIC was 20 % higher than that of PIMGI, because the volumetric efficiency of GDIC was higher than that of PIMGI. However, the brake…
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