valve gear

简明释义

阀装置

英英释义

例句

1.During the inspection, we found that the valve gear 阀门机构 was worn out and needed replacement.

在检查过程中，我们发现valve gear 阀门机构 磨损严重，需要更换。

2.The valve gear 阀门机构 must be properly calibrated to ensure efficient operation.

必须正确校准valve gear 阀门机构 以确保高效运行。

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

工程师解释了如何通过valve gear 阀门机构 调节发动机中的蒸汽流动。

4.The design of the valve gear 阀门机构 can significantly affect the engine's efficiency.

设计valve gear 阀门机构 可以显著影响发动机的效率。

5.Regular maintenance of the valve gear 阀门机构 is crucial for optimal engine performance.

定期维护valve gear 阀门机构 对于最佳发动机性能至关重要。

作文

The term valve gear refers to a system of mechanisms that control the opening and closing of valves in an engine, particularly in steam locomotives and internal combustion engines. Understanding valve gear is crucial for anyone interested in mechanical engineering or the operation of engines. The functioning of an engine relies heavily on the precise timing of valve operations, which directly affects performance, efficiency, and emissions. In steam engines, the valve gear is responsible for managing the flow of steam into and out of the cylinders. A common type of valve gear used in these engines is the Stephenson valve gear, which allows for the adjustment of the valve timing as the locomotive changes speed. This adaptability is essential because it ensures that the engine operates efficiently across various speeds and loads. The mechanics behind the valve gear involve a series of rods and levers that translate the motion of the pistons into the necessary movements to operate the valves. Similarly, in internal combustion engines, the valve gear plays a pivotal role in controlling the intake and exhaust valves. This system is often referred to as the camshaft mechanism, where the rotation of the camshaft opens and closes the valves at the appropriate times during the engine cycle. The design and timing of the valve gear can significantly impact the engine's power output and fuel efficiency. For instance, variable valve timing systems have been developed to optimize valve operation based on engine speed and load conditions, enhancing performance and reducing emissions. The complexity of valve gear systems varies widely depending on the type of engine and its intended use. In high-performance engines, advanced valve gear technologies such as dual overhead camshafts (DOHC) are employed to achieve better airflow and higher RPMs. These systems allow for more precise control over valve timing and lift, which can lead to significant improvements in horsepower and torque. Moreover, the maintenance of valve gear is critical for ensuring the longevity and reliability of an engine. Regular checks and adjustments are necessary to prevent issues such as valve float, where the valves fail to close properly at high RPMs, leading to potential engine damage. Understanding the intricacies of the valve gear allows engineers and technicians to diagnose problems effectively and implement necessary repairs. In conclusion, the valve gear is an integral component of both steam and internal combustion engines, playing a vital role in their operation and efficiency. Whether one is studying mechanical engineering or simply has a passion for engines, comprehending the function and importance of the valve gear is essential. As technology advances, the evolution of valve gear systems will continue to influence engine design and performance, making it a fascinating area of study for future engineers. Understanding the mechanics and engineering principles behind valve gear not only enhances our knowledge of engines but also inspires innovation in automotive technology. As we strive for more efficient and environmentally friendly engines, the role of valve gear will be more significant than ever.

短语valve gear指的是控制发动机中阀门开闭的一系列机制，特别是在蒸汽机和内燃机中。理解valve gear对任何对机械工程或发动机操作感兴趣的人来说都是至关重要的。发动机的运行在很大程度上依赖于阀门操作的精确时机，这直接影响到性能、效率和排放。在蒸汽机中，valve gear负责管理蒸汽进入和离开气缸的流动。蒸汽机中常用的一种valve gear是斯蒂芬森阀门机构，它允许在机车改变速度时调整阀门时机。这种适应性是必不可少的，因为它确保了发动机在各种速度和负载下都能高效运行。valve gear的机械原理涉及一系列杆和杠杆，将活塞的运动转化为操作阀门所需的运动。同样，在内燃机中，valve gear在控制进气和排气阀方面发挥着关键作用。该系统通常被称为凸轮轴机制，其中凸轮轴的旋转在发动机循环的适当时刻打开和关闭阀门。valve gear的设计和时机可以显著影响发动机的功率输出和燃油效率。例如，已经开发出可变阀门正时系统，以优化基于发动机速度和负载条件的阀门操作，从而提高性能并减少排放。valve gear系统的复杂性因发动机类型及其预期用途而异。在高性能发动机中，采用了先进的valve gear技术，例如双顶置凸轮轴（DOHC），以实现更好的气流和更高的转速。这些系统允许对阀门时机和升程进行更精确的控制，这可以显著提高马力和扭矩。此外，维护valve gear对于确保发动机的耐用性和可靠性至关重要。定期检查和调整是必要的，以防止诸如阀门浮动等问题，即在高转速下阀门未能正确关闭，从而导致潜在的发动机损坏。理解valve gear的复杂性使工程师和技术人员能够有效地诊断问题并实施必要的修复。总之，valve gear是蒸汽机和内燃机的重要组成部分，在其运行和效率中发挥着至关重要的作用。无论一个人是学习机械工程还是只是对发动机充满热情，理解valve gear的功能和重要性都是必不可少的。随着技术的发展，valve gear系统的演变将继续影响发动机设计和性能，使其成为未来工程师研究的一个迷人领域。理解valve gear背后的机械和工程原理不仅增强了我们对发动机的知识，而且激发了汽车技术的创新。随着我们努力寻找更高效和环保的发动机，valve gear的作用将比以往任何时候都更加重要。