four stroke engine

简明释义

四冲程发动机

英英释义

例句

1.In comparison to two-stroke engines, a four stroke engine is generally quieter.

与二冲程发动机相比，四冲程发动机通常更安静。

2.The four stroke engine operates on four distinct phases: intake, compression, power, and exhaust.

四冲程发动机在四个不同的阶段运行：进气、压缩、动力和排气。

3.Many lawn mowers use a four stroke engine for better performance and lower emissions.

许多割草机使用四冲程发动机以获得更好的性能和更低的排放。

4.The motorcycle is powered by a four stroke engine, which makes it more fuel-efficient.

这辆摩托车由一个四冲程发动机驱动，这使得它更加节能。

5.The four stroke engine in this car provides a smooth driving experience.

这辆车中的四冲程发动机提供了平稳的驾驶体验。

作文

The development of the four stroke engine has revolutionized the automotive and machinery industries. A four stroke engine (四冲程发动机) operates through four distinct phases: intake, compression, power, and exhaust. These phases work together to convert fuel into mechanical energy, which powers vehicles and various types of equipment. Understanding these phases is crucial for anyone interested in mechanics or engineering.During the intake phase, the engine draws in a mixture of air and fuel. This mixture enters the combustion chamber as the piston moves downwards. The efficiency of this phase is vital, as it determines how much fuel and air can be combined for combustion. Next comes the compression phase, where the piston moves back up, compressing the fuel-air mixture. This compression is essential because it increases the mixture's temperature and pressure, making it more volatile when ignited.The power phase follows, marked by the ignition of the compressed fuel-air mixture. In a four stroke engine (四冲程发动机), this ignition is typically initiated by a spark plug, although diesel engines rely on compression ignition. The explosion pushes the piston down, generating power that drives the crankshaft and ultimately propels the vehicle. This phase is where the engine produces its usable energy, making it the most critical part of the cycle.Finally, the exhaust phase occurs when the piston moves back up again, pushing out the spent gases from the combustion process. This phase is crucial for maintaining engine efficiency, as any leftover gases can hinder the intake of fresh air-fuel mixtures in the next cycle. The design of the exhaust system plays a significant role in ensuring that the gases are expelled effectively, reducing emissions and improving overall performance.One of the main advantages of the four stroke engine (四冲程发动机) is its fuel efficiency. Because it completes a power cycle every two revolutions of the crankshaft, it can extract more energy from the fuel compared to a two-stroke engine. Additionally, the four stroke engine (四冲程发动机) tends to produce fewer emissions, making it more environmentally friendly. This is particularly important in today's world, where sustainability and environmental impact are significant concerns.Moreover, four stroke engines (四冲程发动机) are widely used in various applications beyond automobiles, including motorcycles, lawnmowers, and even some aircraft. Their versatility and reliability make them an excellent choice for many different types of machinery. Mechanics and engineers often prefer four stroke engines (四冲程发动机) due to their durability and lower maintenance needs compared to other types of engines.In conclusion, the four stroke engine (四冲程发动机) is a remarkable invention that has greatly influenced modern transportation and machinery. Understanding its operation not only helps in grasping the fundamentals of mechanical engineering but also highlights the importance of innovation in our daily lives. As technology continues to advance, the principles behind the four stroke engine (四冲程发动机) will likely remain relevant, adapting to meet the demands of future energy solutions.