valve gear

简明释义

阀动装置

英英释义

例句

1.He demonstrated how to disassemble the valve gear 阀门机构 for inspection.

他演示了如何拆卸<阀门机构>进行检查。

2.Adjusting the valve gear 阀门机构 can improve the efficiency of the locomotive.

调整<阀门机构>可以提高机车的效率。

3.The engineer explained how the valve gear 阀门机构 controls the flow of steam in the engine.

工程师解释了<阀门机构>如何控制引擎中的蒸汽流动。

4.Regular maintenance of the valve gear 阀门机构 is essential for optimal engine performance.

定期维护<阀门机构>对于最佳引擎性能至关重要。

5.The malfunctioning valve gear 阀门机构 caused a significant drop in power output.

故障的<阀门机构>导致功率输出显著下降。

作文

The term valve gear refers to a mechanical system used in engines and machines to control the timing and operation of valves. In internal combustion engines, for example, valve gear plays a crucial role in managing the intake and exhaust of gases, ensuring that the engine operates efficiently. The design of valve gear can vary significantly, but its primary purpose remains the same: to synchronize the opening and closing of valves with the movement of the engine's pistons.Understanding valve gear is essential for anyone interested in mechanical engineering or automotive technology. The most common types of valve gear include overhead camshaft (OHC) systems and pushrod systems. OHC systems are typically found in modern vehicles, providing precise control over valve timing, which leads to better performance and fuel efficiency. On the other hand, pushrod systems are more traditional and can be found in older engine designs.One of the key components of valve gear is the camshaft, which is responsible for converting the rotational motion of the engine into linear motion that opens and closes the valves. The profile of the camshaft determines how quickly and how far the valves open, impacting the engine's power output and efficiency. Additionally, the timing of the camshaft must be carefully synchronized with the crankshaft to ensure that the valves open and close at the correct moments during the engine cycle.Another important aspect of valve gear is the use of timing belts or chains. These components connect the crankshaft to the camshaft, allowing for precise timing between the two. If the timing is off, it can lead to serious engine problems, including misfires or even catastrophic engine failure. This is why regular maintenance and checks of the valve gear components are critical for the longevity of any engine.In addition to automotive applications, valve gear is also extensively used in various industrial machinery, such as steam engines and hydraulic systems. In steam engines, for instance, the valve gear controls the flow of steam into the cylinders, which is vital for the engine's operation. The design and functionality of valve gear in these applications can be quite complex, often involving multiple valves and intricate linkages to achieve the desired performance.As technology advances, the design and materials used in valve gear continue to evolve. Modern materials, such as lightweight alloys and advanced composites, help reduce weight while increasing strength and durability. Furthermore, innovations such as variable valve timing (VVT) systems allow for even greater control over valve operation, optimizing engine performance across a range of speeds and loads.In conclusion, understanding valve gear is fundamental for anyone involved in the fields of engineering or mechanics. Its role in controlling valve operation is critical to the efficiency and performance of engines and machinery. Whether in automotive applications or industrial settings, the principles behind valve gear remain a vital area of study and innovation in mechanical design. As we move towards more efficient and powerful engines, the importance of mastering valve gear will only continue to grow.

短语valve gear指的是在发动机和机器中用于控制阀门的时机和操作的机械系统。例如，在内燃机中，valve gear在管理气体的进气和排气方面发挥着至关重要的作用，确保发动机高效运转。valve gear的设计可能会有很大差异，但其主要目的始终如一：使阀门的开启和关闭与发动机活塞的运动同步。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。最常见的valve gear类型包括顶置凸轮轴(OHC)系统和推杆系统。OHC系统通常出现在现代车辆中，提供对阀门时机的精确控制，从而提高性能和燃油效率。另一方面，推杆系统则更为传统，常见于旧款发动机设计中。valve gear的一个关键组件是凸轮轴，它负责将发动机的旋转运动转化为线性运动，以打开和关闭阀门。凸轮轴的轮廓决定了阀门打开的速度和幅度，这影响到发动机的功率输出和效率。此外，凸轮轴的时机必须与曲轴精确同步，以确保阀门在发动机循环的正确时刻打开和关闭。valve gear的另一个重要方面是使用定时带或链条。这些组件将曲轴与凸轮轴连接起来，从而实现两者之间的精确时机。如果时机不对，可能会导致严重的发动机问题，包括失火甚至灾难性的发动机故障。因此，定期维护和检查valve gear组件对于任何发动机的耐用性至关重要。除了汽车应用，valve gear还广泛应用于各种工业机械中，如蒸汽机和液压系统。例如，在蒸汽机中，valve gear控制蒸汽流入气缸，这对发动机的运行至关重要。这些应用中valve gear的设计和功能可能相当复杂，通常涉及多个阀门和复杂的连杆，以实现所需的性能。随着技术的进步，valve gear的设计和材料也在不断发展。现代材料，如轻质合金和先进复合材料，有助于减少重量，同时增加强度和耐用性。此外，诸如可变阀门时机(VVT)系统等创新可以实现对阀门操作的更大控制，优化各种速度和负载下的发动机性能。总之，理解valve gear对任何参与工程或机械领域的人来说都是基本的。它在控制阀门操作中的作用对发动机和机器的效率和性能至关重要。无论是在汽车应用还是工业环境中，valve gear背后的原理仍然是机械设计中一个重要的研究和创新领域。随着我们向更高效、更强大的发动机迈进，掌握valve gear的重要性只会继续增长。