four stroke

简明释义

四冲程

英英释义

例句

1.I prefer a four stroke 四冲程 lawn mower because it produces less noise.

我更喜欢使用四冲程 four stroke 割草机，因为它产生的噪音更小。

2.Many motorcycles use a four stroke 四冲程 engine for better fuel efficiency.

许多摩托车使用四冲程 four stroke 发动机以提高燃油效率。

3.The four stroke 四冲程 engine is more environmentally friendly than a two-stroke engine.

与二冲程发动机相比，四冲程 four stroke 发动机更环保。

4.The four stroke 四冲程 cycle is essential for understanding how engines work.

了解发动机工作原理时，四冲程 four stroke 循环是必不可少的。

5.The mechanic explained how to maintain a four stroke 四冲程 engine.

机械师讲解了如何维护一个四冲程 four stroke 发动机。

作文

The term four stroke refers to a specific type of internal combustion engine cycle that is widely used in various types of machinery, including motorcycles, lawn mowers, and cars. The four stroke cycle consists of four distinct phases: intake, compression, power, and exhaust. Each phase plays a crucial role in ensuring that the engine operates efficiently and effectively.In the intake phase, the engine draws in a mixture of air and fuel through the intake valve. This is an essential step, as it prepares the engine for the combustion process that will follow. During this phase, the piston moves down the cylinder, creating a vacuum that allows the air-fuel mixture to enter.Next comes the compression phase. Once the intake valve closes, the piston moves back up the cylinder, compressing the air-fuel mixture. This compression increases the temperature and pressure of the mixture, making it more volatile and ready for combustion. The efficiency of this phase is critical, as it directly impacts the power output of the engine.The third phase is the power phase, where the compressed air-fuel mixture is ignited by a spark from the spark plug. This explosion forces the piston down, generating power that turns the crankshaft and ultimately drives the vehicle or powers the machinery. The energy produced during this phase is what makes the four stroke engine so effective and widely used.Finally, the exhaust phase occurs when the piston moves back up the cylinder again, pushing out the spent gases through the exhaust valve. This phase is essential for maintaining the engine's performance, as it ensures that the engine does not become choked with exhaust gases, which can hinder its operation.The four stroke engine has several advantages over its two-stroke counterpart. One of the main benefits is its efficiency. Because it completes a full cycle in four strokes of the piston, it can burn fuel more completely, resulting in better fuel economy and reduced emissions. Additionally, four stroke engines tend to have a longer lifespan due to their design, which allows for better lubrication and less wear and tear on the components.However, four stroke engines are typically heavier and more complex than two-stroke engines, which can make them less suitable for certain applications, such as lightweight motorcycles or handheld power tools. Despite these drawbacks, the four stroke engine remains the preferred choice for many applications where efficiency and durability are paramount.In conclusion, understanding the mechanics of the four stroke engine is essential for anyone interested in automotive technology or machinery. Its four distinct phases work together to create a powerful and efficient engine that has become a staple in modern transportation and equipment. As technology continues to advance, the four stroke engine will likely remain a crucial part of our mechanical landscape, continually evolving to meet the demands of consumers and the environment.

术语四冲程指的是一种特定类型的内燃机循环，广泛应用于各种机械设备，包括摩托车、割草机和汽车。四冲程循环由四个不同的阶段组成：进气、压缩、动力和排气。每个阶段在确保发动机高效有效地运行中都发挥着至关重要的作用。在进气阶段，发动机通过进气阀吸入空气和燃料的混合物。这是一个关键步骤，因为它为随后的燃烧过程做准备。在此阶段，活塞向下移动气缸，产生真空，使空气-燃料混合物进入。接下来是压缩阶段。一旦进气阀关闭，活塞再次向上移动气缸，压缩空气-燃料混合物。这个压缩提高了混合物的温度和压力，使其更具挥发性并准备好进行燃烧。这个阶段的效率至关重要，因为它直接影响发动机的功率输出。第三个阶段是动力阶段，此时压缩的空气-燃料混合物被火花塞点燃。这个爆炸将活塞向下推，产生的动力驱动曲轴，从而推动车辆或为机械提供动力。这个阶段产生的能量使得四冲程发动机如此有效且广泛使用。最后，排气阶段发生，活塞再次向上移动气缸，将废气通过排气阀推出。这个阶段对于保持发动机性能至关重要，因为它确保发动机不会被废气堵塞，从而妨碍其运作。与其两冲程对应物相比，四冲程发动机具有多个优点。主要好处之一是其效率。由于它在活塞的四个冲程中完成一个完整的循环，因此能够更完全地燃烧燃料，从而实现更好的燃油经济性和减少排放。此外，由于设计允许更好的润滑和较少的磨损，四冲程发动机的使用寿命通常较长。然而，四冲程发动机通常比两冲程发动机重且复杂，这可能使其不适合某些应用，例如轻型摩托车或手持电动工具。尽管存在这些缺点，四冲程发动机仍然是许多需要效率和耐用性的应用的首选。总之，理解四冲程发动机的工作原理对于任何对汽车技术或机械感兴趣的人来说都是至关重要的。它的四个不同阶段共同协作，创造出一种强大而高效的发动机，已成为现代交通和设备的支柱。随着技术的不断进步，四冲程发动机可能仍将是我们机械领域的重要组成部分，不断发展以满足消费者和环境的需求。