overhead cam shaft

简明释义

上凸轮轴上部凸轮轴

英英释义

例句

1.A malfunctioning overhead cam shaft can lead to poor engine efficiency.

故障的顶置凸轮轴可能导致发动机效率低下。

2.The engine's performance improved significantly after we replaced the worn-out overhead cam shaft.

更换磨损的顶置凸轮轴后，发动机的性能显著提升。

3.When tuning the engine, it's essential to consider the specifications of the overhead cam shaft.

在调校发动机时，考虑顶置凸轮轴的规格是至关重要的。

4.The mechanic explained how the overhead cam shaft works in conjunction with the valves.

机械师解释了顶置凸轮轴如何与气门协同工作。

5.Many modern sports cars feature an advanced overhead cam shaft design for better power delivery.

许多现代跑车采用先进的顶置凸轮轴设计，以提供更好的动力输出。

作文

The automotive industry has seen significant advancements in technology over the years, particularly in engine design. One of the key components that has evolved is the camshaft. The term overhead cam shaft refers to a camshaft that is located above the engine's cylinders, as opposed to being situated within the engine block. This design offers several advantages that enhance engine performance and efficiency.To understand the importance of an overhead cam shaft, it's essential to grasp its function. The camshaft controls the opening and closing of the engine's valves, which are crucial for the intake of air and fuel, as well as the exhaust of combustion gases. By positioning the camshaft overhead, manufacturers can achieve a more direct connection between the camshaft and the valves, reducing the complexity of the engine's mechanics.One of the primary benefits of an overhead cam shaft design is the reduction in weight and size of the engine. Traditional camshaft systems often require additional components such as pushrods and rocker arms, which can add bulk and weight to the engine. In contrast, the overhead design eliminates these extra parts, resulting in a lighter and more compact engine. This reduction in weight not only improves fuel efficiency but also enhances the overall handling and performance of the vehicle.Moreover, the overhead cam shaft allows for more precise timing of valve movements. This precision is critical in modern engines where performance and efficiency are paramount. With advanced technologies such as variable valve timing, an overhead cam shaft can adjust the timing of the valve openings and closings based on the engine's speed and load conditions. This adaptability leads to improved power output and reduced emissions, making it an environmentally friendly choice for car manufacturers.In addition to performance benefits, an overhead cam shaft design also contributes to easier maintenance. Since the camshaft is more accessible when placed above the engine, mechanics can perform inspections and repairs more efficiently. This accessibility can lead to lower labor costs and less downtime for vehicle owners, making it a practical choice for both manufacturers and consumers.However, it is essential to note that the overhead cam shaft is not without its challenges. The complexity of the design can sometimes lead to higher production costs, which may be passed on to the consumer. Furthermore, while the overhead design offers many advantages, it may not be suitable for all types of engines, particularly those that prioritize simplicity and cost-effectiveness over performance.In conclusion, the overhead cam shaft is a pivotal component in modern automotive engineering. Its design promotes better performance, efficiency, and maintainability, making it a popular choice among manufacturers. As technology continues to advance, we can expect further innovations related to the overhead cam shaft, ultimately leading to even more efficient and powerful engines in the future.

汽车工业随着时间的推移在技术上经历了显著的进步，特别是在发动机设计方面。其中一个关键组件是凸轮轴。术语overhead cam shaft指的是位于发动机气缸上方的凸轮轴，而不是位于发动机缸体内。这种设计提供了几种优势，可以增强发动机性能和效率。要理解overhead cam shaft的重要性，首先需要了解其功能。凸轮轴控制发动机阀门的开启和关闭，这对空气和燃料的吸入以及燃烧气体的排放至关重要。通过将凸轮轴放置在上方，制造商可以实现凸轮轴与阀门之间更直接的连接，从而减少发动机机械结构的复杂性。overhead cam shaft设计的主要好处之一是发动机重量和尺寸的减小。传统的凸轮轴系统通常需要额外的部件，如推杆和摇臂，这会增加发动机的体积和重量。相比之下，上置设计消除了这些额外部件，从而使发动机变得更轻、更紧凑。这种重量的减少不仅提高了燃油效率，还改善了车辆的整体操控性和性能。此外，overhead cam shaft允许更加精确的阀门运动时序。这种精确性在现代发动机中至关重要，因为性能和效率是重中之重。借助诸如可变气门正时等先进技术，overhead cam shaft可以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。这种适应性导致了更高的功率输出和更低的排放，使其成为汽车制造商的环保选择。除了性能优势外，overhead cam shaft设计还使维护更为方便。由于凸轮轴在发动机顶部更易于接触，机械师可以更高效地进行检查和修理。这种可及性可以降低劳动成本，并减少车辆所有者的停工时间，使其成为制造商和消费者的实用选择。然而，需要注意的是，overhead cam shaft并非没有挑战。设计的复杂性有时可能导致更高的生产成本，这可能会转嫁给消费者。此外，尽管上置设计提供了许多优势，但它可能不适合所有类型的发动机，特别是那些优先考虑简单性和成本效益而非性能的发动机。总之，overhead cam shaft是现代汽车工程中的关键组成部分。其设计促进了更好的性能、效率和可维护性，使其成为制造商的热门选择。随着技术的不断进步，我们可以期待与overhead cam shaft相关的进一步创新，最终导致未来更高效、更强大的发动机。