valve gear

简明释义

阀动装置

英英释义

例句

1.He explained how the valve gear controls the flow of steam in the locomotive.

他解释了阀门机构如何控制机车中的蒸汽流动。

2.The technician replaced the worn-out components of the valve gear.

技术员更换了阀门机构中磨损的部件。

3.Proper maintenance of the valve gear is crucial for the longevity of the machinery.

对阀门机构的适当维护对机械的使用寿命至关重要。

4.The valve gear in this model is designed for maximum efficiency.

这个模型中的阀门机构设计为最大效率。

5.The engineer adjusted the valve gear to improve the engine's performance.

工程师调整了阀门机构以提高发动机的性能。

作文

The term valve gear refers to a crucial component in various types of engines, particularly in steam locomotives and internal combustion engines. It plays an essential role in controlling the timing and operation of valves, which regulate the flow of air and fuel into the engine cylinders. Understanding valve gear is vital for anyone interested in mechanical engineering or automotive technology. To delve deeper into the concept, we must first recognize that the primary function of valve gear is to ensure that the valves open and close at the appropriate times during the engine's cycle. This synchronization is critical because it directly affects the engine's efficiency, power output, and emissions. In steam engines, for instance, the valve gear determines how steam enters and exits the cylinders, thereby influencing the locomotive's performance. There are several types of valve gear systems, including the slide valve, piston valve, and poppet valve mechanisms. Each system has its unique characteristics and applications. The slide valve, for example, is commonly used in older steam engines due to its simplicity and reliability. In contrast, modern internal combustion engines often utilize poppet valves, which are operated by camshafts and allow for more precise control over valve timing. One of the most notable innovations in valve gear technology is the development of variable valve timing (VVT) systems. These advanced systems adjust the timing of the valve openings and closings based on the engine's speed and load conditions. This adjustment leads to improved fuel efficiency and reduced emissions, making VVT a popular choice in contemporary automotive design. The importance of valve gear extends beyond just performance; it also impacts the longevity of an engine. Properly functioning valve gear ensures that the engine runs smoothly, reducing wear and tear on components. Conversely, if the valve gear malfunctions, it can lead to severe engine damage, decreased performance, and increased maintenance costs. In conclusion, the valve gear is a fundamental aspect of engine design and operation. Its role in controlling valve timing is indispensable for achieving optimal performance, efficiency, and durability in engines. As technology advances, the evolution of valve gear systems will continue to play a significant role in shaping the future of automotive engineering. Therefore, a comprehensive understanding of valve gear is crucial for aspiring engineers and enthusiasts alike. Whether you are studying mechanical engineering or simply have a passion for engines, grasping the intricacies of valve gear will enhance your knowledge and appreciation of how engines work.

短语valve gear指的是各种类型发动机中的一个关键组件，特别是在蒸汽机车和内燃机中。它在控制阀门的时机和操作方面发挥着重要作用，这些阀门调节空气和燃料进入发动机气缸的流动。理解valve gear对任何对机械工程或汽车技术感兴趣的人来说都是至关重要的。为了深入了解这一概念，我们必须首先认识到valve gear的主要功能是确保阀门在发动机循环的适当时刻打开和关闭。这种同步对于发动机的效率、功率输出和排放直接影响，因为它直接关系到发动机的性能。例如，在蒸汽机中，valve gear决定了蒸汽如何进入和退出气缸，从而影响机车的性能。有几种类型的valve gear系统，包括滑阀、活塞阀和升降阀机制。每个系统都有其独特的特性和应用。滑阀例如，由于其简单性和可靠性，通常用于较老的蒸汽机。而现代内燃机则常常使用升降阀，这些阀门由凸轮轴驱动，可以更精确地控制阀门的时机。在valve gear技术中，一个显著的创新是可变气门正时（VVT）系统的发展。这些先进的系统根据发动机的转速和负载条件调整阀门的开启和关闭时机。这种调整提高了燃油效率并减少了排放，使VVT成为当代汽车设计中的热门选择。valve gear的重要性不仅仅体现在性能上；它还影响着发动机的寿命。正常运作的valve gear确保发动机平稳运行，减少部件的磨损。如果valve gear发生故障，可能导致严重的发动机损坏、性能下降和维护成本增加。总之，valve gear是发动机设计和操作中的基本方面。它在控制阀门时机方面的作用对实现发动机的最佳性能、效率和耐用性至关重要。随着技术的进步，valve gear系统的演变将继续在塑造汽车工程的未来中发挥重要作用。因此，全面理解valve gear对于有志于工程师和爱好者而言都是至关重要的。无论你是在学习机械工程还是仅仅对发动机充满热情，掌握valve gear的复杂性将增强你对发动机工作原理的知识和欣赏。