valve gear

简明释义

阀装置

英英释义

例句

1.The valve gear malfunction caused a significant drop in efficiency.

故障的阀门装置导致效率显著下降。

2.He explained how the valve gear controls the flow of steam in the turbine.

他解释了阀门装置如何控制涡轮中的蒸汽流动。

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

工程师调整了阀门装置以提高发动机的性能。

4.The design of the valve gear was crucial for the success of the project.

阀门装置的设计对项目的成功至关重要。

5.Regular maintenance of the valve gear is essential for safe operation.

定期维护阀门装置对于安全操作至关重要。

作文

In the world of engineering and mechanics, the term valve gear refers to a system that controls the operation of valves in various machinery. This mechanism is crucial in engines, particularly in internal combustion engines, where it plays a significant role in regulating the flow of air and fuel mixture into the cylinders and the exhaust gases out of them. Understanding how valve gear works can provide insights into the efficiency and performance of an engine.The primary function of valve gear is to synchronize the opening and closing of valves with the movement of the pistons. In a typical four-stroke engine, for example, the cycle consists of intake, compression, power, and exhaust strokes. The valve gear ensures that the intake valves open at the right moment to allow the air-fuel mixture to enter the cylinder and that the exhaust valves open when the combustion process is complete, allowing the exhaust gases to escape.There are various types of valve gear systems, including overhead camshaft (OHC) designs and pushrod setups. The OHC design is often found in modern engines due to its ability to reduce weight and increase efficiency. In this system, the camshaft is located above the cylinder head, directly controlling the opening and closing of the valves. On the other hand, pushrod systems, more common in older engines, use a series of rods to transfer motion from the camshaft to the valves, which can add complexity and weight.One of the most important aspects of valve gear is its timing. The timing of the valve openings and closings is critical for optimal engine performance. If the valves open too early or too late, it can lead to inefficient combustion, reduced power output, and increased emissions. To address this issue, many modern engines utilize variable valve timing (VVT) technology. VVT allows the engine's computer to adjust the timing of the valve gear based on the engine speed and load, optimizing performance across a range of operating conditions.In addition to performance benefits, a well-designed valve gear system can enhance the durability of an engine. Properly timed and controlled valves can reduce wear and tear on engine components, leading to a longer lifespan. Moreover, advancements in materials and manufacturing processes have allowed for the development of more robust valve gear systems that can withstand higher temperatures and pressures, further improving engine reliability.In conclusion, the valve gear is a fundamental component of internal combustion engines, playing a vital role in their operation and efficiency. Its design and functionality significantly impact engine performance, emissions, and longevity. As technology continues to advance, the evolution of valve gear systems will likely lead to even more efficient and powerful engines, showcasing the importance of this seemingly simple yet complex mechanism in the realm of engineering.

在工程和机械的世界中，术语valve gear指的是控制各种机械中阀门操作的系统。这个机制在发动机中至关重要，特别是在内燃机中，它在调节空气和燃料混合物进入气缸以及废气排出的过程中起着重要作用。理解valve gear的工作原理可以为我们提供有关发动机效率和性能的见解。valve gear的主要功能是使阀门的开启和关闭与活塞的运动同步。例如，在典型的四冲程发动机中，循环包括进气、压缩、动力和排气冲程。valve gear确保进气阀在适当的时刻打开，以允许空气-燃料混合物进入气缸，并且在燃烧过程完成时，排气阀打开，允许废气逃逸。有多种类型的valve gear系统，包括顶置凸轮轴（OHC）设计和推杆设置。OHC设计通常出现在现代发动机中，因为它能够减轻重量并提高效率。在该系统中，凸轮轴位于气缸盖上方，直接控制阀门的开启和关闭。另一方面，推杆系统在较旧的发动机中更为常见，使用一系列杆将运动从凸轮轴传递到阀门，这可能增加复杂性和重量。valve gear的一个重要方面是其定时。阀门的开启和关闭时机对最佳发动机性能至关重要。如果阀门打开得太早或太晚，可能会导致燃烧效率低下、功率输出减少和排放增加。为了解决这个问题，许多现代发动机采用可变气门正时（VVT）技术。VVT允许发动机的计算机根据发动机转速和负载调整valve gear的时机，从而优化各种工作条件下的性能。除了性能优势外，设计良好的valve gear系统还可以增强发动机的耐用性。适时控制的阀门可以减少发动机部件的磨损，从而延长使用寿命。此外，材料和制造工艺的进步使得开发出更坚固的valve gear系统成为可能，这些系统能够承受更高的温度和压力，进一步提高发动机的可靠性。总之，valve gear是内燃机的基本组成部分，在其运行和效率中发挥着至关重要的作用。其设计和功能对发动机性能、排放和寿命产生重大影响。随着技术的不断进步，valve gear系统的演变可能会导致更高效、更强大的发动机，展示出这一看似简单但复杂的机制在工程领域的重要性。