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Diesel-electric transmission, or diesel-electric powertrain is used by a number of vehicle and ship types for providing locomotion. A diesel-electric transmission system includes a diesel engine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required. Before diesel engines came into widespread use, a similar system, using a petrol (gasoline) engine and called petrol-electric or gas-electric, was sometimes used. Diesel-electric transmission is used on railways by diesel electric locomotives and diesel electric multiple units, as electric motors are able to supply full torque at 0 RPM. Diesel-electric systems are also used in submarines and surface ships and some land vehicles. In some high-efficiency applications, electrical energy may be stored in rechargeable batteries, in which case these vehicles can be considered as a class of hybrid electric vehicle. ==Ships== The first diesel motorship was also the first diesel-electric ship, the Russian tanker ''Vandal'' from Branobel, which was launched in 1903. Steam turbine-electric propulsion has been in use since the 1920s (s), using diesel-electric powerplants in surface ships has increased lately. The Finnish coastal defence ships ''Ilmarinen'' and ''Väinämöinen'' laid down in 1928–1929, were among the first surface ships to use diesel-electric transmission. Later, the technology was used in diesel powered icebreakers. In World War II the United States built diesel-electric surface warships. Due to machinery shortages destroyer escorts of the and es were diesel-electric, with half their designed horsepower (The and es were full-power steam turbine-electric). The s, on the other hand, were designed for diesel-electric propulsion because of its flexibility and resistance to damage.〔Silverstone(66), page378〕 Some modern ships, including cruise ships and icebreakers, use electric motors in pods called azimuth thrusters underneath to allow for 360° rotation, making the ships far more maneuverable. Gas turbines are also used for electrical power generation and some ships use a combination: the ''Queen Mary 2'' has a set of diesel engines in the bottom of the ship plus two gas turbines mounted near the main funnel; all are used for generating electrical power, including those used to drive the propellers. This provides a relatively simple way to use the high-speed, low-torque output of a turbine to drive a low-speed propeller, without the need for excessive reduction gearing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diesel-electric transmission」の詳細全文を読む スポンサード リンク
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