overhead valve

简明释义

上面的汽阀

英英释义

例句

1.An overhead valve mechanism can lead to higher RPMs in engines.

顶置气门机制可以使发动机达到更高的转速。

2.The engine features an overhead valve design for improved airflow.

该发动机采用了顶置气门设计，以提高气流效率。

3.Many modern cars utilize overhead valves to enhance performance.

许多现代汽车使用顶置气门来提升性能。

4.In motorcycles, an overhead valve system can provide a compact design.

在摩托车中，顶置气门系统可以提供紧凑的设计。

5.The use of overhead valves allows for better fuel efficiency.

使用顶置气门可以提高燃油效率。

作文

The concept of the overhead valve is fundamental in the design and operation of modern internal combustion engines. An overhead valve (OHV) engine features valves that are located in the cylinder head, above the combustion chamber, rather than in the engine block. This design allows for a more efficient airflow into and out of the cylinders, which can lead to improved performance and fuel efficiency. The positioning of the overhead valve plays a crucial role in how an engine breathes, impacting both power output and emissions. One of the main advantages of the overhead valve configuration is its ability to allow for larger valves compared to traditional pushrod designs. Larger valves can increase the volume of air and fuel entering the cylinder, which enhances combustion and ultimately boosts horsepower. Additionally, the overhead valve layout facilitates a more compact engine design, which can contribute to lighter overall vehicle weight and better handling characteristics. In contrast, engines with valves located in the block, known as side-valve or flathead engines, often struggle with airflow limitations due to their design. This can result in lower performance and efficiency. As automotive technology has advanced, the overhead valve design has become the standard in most modern vehicles, including cars, trucks, and motorcycles. Furthermore, the overhead valve system can also be linked to advancements in variable valve timing (VVT) technologies. VVT systems optimize engine performance by adjusting the timing of the valve openings and closings based on driving conditions. This means that an engine equipped with overhead valves can operate more efficiently across different RPM ranges, providing both power when needed and fuel savings during normal driving. However, while overhead valve engines offer numerous benefits, they also come with some drawbacks. For instance, the complexity of the valve train can lead to increased maintenance requirements. Timing belts or chains must be regularly inspected and replaced to ensure proper functioning of the overhead valve mechanism. Additionally, while overhead valve engines tend to produce more power, they may also generate more heat, necessitating effective cooling systems to prevent overheating. In summary, the overhead valve design is a significant technological advancement in engine architecture that has transformed the automotive industry. By optimizing airflow, enabling larger valves, and supporting innovative technologies like VVT, overhead valves have paved the way for more powerful, efficient, and environmentally friendly vehicles. Understanding the importance of the overhead valve is essential for anyone interested in automotive engineering or the mechanics of modern engines. As we continue to innovate in this field, the role of the overhead valve will remain crucial in shaping the future of transportation and energy efficiency.

“顶置气门”这一概念在现代内燃机的设计和操作中至关重要。一个“顶置气门”（OHV）发动机的气门位于气缸盖上方，位于燃烧室之上，而不是在发动机块中。这种设计允许空气更有效地流入和流出气缸，从而提高性能和燃油效率。“顶置气门”的位置在发动机的呼吸方式中起着至关重要的作用，影响功率输出和排放。“顶置气门”配置的主要优点之一是它能够容纳比传统推杆设计更大的气门。较大的气门可以增加进入气缸的空气和燃料的体积，从而增强燃烧并最终提升马力。此外，“顶置气门”布局促进了更紧凑的发动机设计，这可以有助于减轻整体车辆重量并改善操控特性。相比之下，气门位于发动机块中的发动机（称为侧气门或平头发动机）通常由于其设计而面临气流限制。这可能导致性能和效率低下。随着汽车技术的进步，“顶置气门”设计已成为大多数现代车辆（包括汽车、卡车和摩托车）的标准。此外，“顶置气门”系统还可以与可变气门正时（VVT）技术的进步联系在一起。VVT系统通过根据驾驶条件调整气门的开启和关闭时间来优化发动机性能。这意味着配备“顶置气门”的发动机可以在不同的转速范围内更有效地运作，在需要动力时提供动力，并在正常驾驶过程中节省燃油。然而，虽然“顶置气门”发动机提供了众多好处，但它们也带来了一些缺点。例如，气门机构的复杂性可能导致维护要求增加。必须定期检查和更换时规皮带或链条，以确保“顶置气门”机制的正常运作。此外，尽管“顶置气门”发动机往往能产生更多的功率，但它们也可能产生更多的热量，因此需要有效的冷却系统以防止过热。总之，“顶置气门”设计是发动机架构中的一项重要技术进步，它改变了汽车工业。通过优化气流、启用更大的气门以及支持像VVT这样的创新技术，“顶置气门”为更强大、更高效和更环保的车辆铺平了道路。了解“顶置气门”的重要性对于任何对汽车工程或现代发动机机械感兴趣的人来说都是至关重要的。随着我们在这一领域的不断创新，“顶置气门”的作用将在塑造未来交通和能源效率方面继续发挥关键作用。