open crank case

简明释义

开式曲轴箱

英英释义

例句

1.Make sure to cover the open crank case to prevent dirt from entering.

确保覆盖开式曲轴箱以防止污垢进入。

2.The mechanic explained that an open crank case can lead to contamination of the engine oil.

机械师解释说，开式曲轴箱可能导致发动机油的污染。

3.An open crank case is essential for allowing proper ventilation in high-performance engines.

开式曲轴箱对于高性能发动机的适当通风是必不可少的。

4.Before starting the repair, we need to drain the oil from the open crank case.

在开始维修之前，我们需要从开式曲轴箱中排出油。

5.During the engine inspection, we noticed that the open crank case was leaking oil.

在发动机检查过程中，我们注意到开式曲轴箱漏油。

作文

The term open crank case refers to a design feature found in certain types of engines, particularly two-stroke engines. In an open crank case, the crankshaft is exposed to the atmosphere, which allows for easier access and maintenance. This design contrasts with a closed crankcase, where the crankshaft is enclosed within a sealed housing. The choice between these two designs can significantly affect the performance, efficiency, and maintenance of the engine. One of the primary advantages of an open crank case is its simplicity. Because there are fewer components involved in the construction of the engine, it is generally lighter and less complex than its closed counterpart. This simplicity can lead to reduced manufacturing costs and easier repairs, making it an attractive option for smaller engines used in applications like lawn mowers, chainsaws, and small motorcycles. Moreover, the open crank case allows for better ventilation of the crankcase gases, which can help in reducing the pressure build-up that often occurs in closed systems. This can lead to improved performance, as the engine can operate more efficiently without the constraints of excess pressure. Additionally, the direct exposure of the crankshaft to the environment can facilitate cooling, which is particularly beneficial in high-performance applications where overheating can be a concern. However, there are also disadvantages associated with an open crank case. One significant drawback is the increased risk of contamination. Since the crankshaft is exposed, dirt, debris, and moisture can easily enter the crankcase, leading to potential damage and decreased engine longevity. To mitigate this risk, regular maintenance and cleaning are essential, which can be an inconvenience for users. Another disadvantage is the potential for increased noise levels. An open crank case does not provide the same level of sound insulation as a closed crankcase, which can lead to louder operation. For applications where noise is a concern, such as in residential areas or during nighttime use, this could be a significant issue. In conclusion, the choice between an open crank case and a closed crankcase design depends on the specific needs and applications of the engine. While the open crank case offers benefits such as simplicity, reduced weight, and better ventilation, it also poses challenges related to contamination and noise. Understanding these factors can help engineers and manufacturers make informed decisions when designing engines for various purposes. Ultimately, the design of the crankcase plays a crucial role in the overall performance and reliability of the engine, making it an important consideration in automotive and machinery engineering.

术语open crank case指的是某些类型发动机，特别是二冲程发动机中发现的一种设计特征。在open crank case中，曲轴暴露在大气中，这使得维护和访问变得更加容易。这种设计与封闭曲轴箱相对立，在封闭曲轴箱中，曲轴被封闭在一个密封的外壳内。这两种设计之间的选择会显著影响发动机的性能、效率和维护。open crank case的主要优点之一是其简单性。由于发动机的构造中涉及的组件较少，它通常比其封闭的对应物更轻、更简单。这种简单性可以降低制造成本，并使维修变得更加容易，使其成为小型发动机（如割草机、链锯和小型摩托车）应用的一个有吸引力的选择。此外，open crank case允许曲轴箱气体更好地通风，这有助于减少封闭系统中经常发生的压力积聚。这可以提高性能，因为发动机可以在没有过多压力限制的情况下更有效地运行。此外，曲轴直接暴露在环境中可以促进冷却，这在高性能应用中尤为有利，因为过热可能是一个问题。然而，open crank case也存在一些缺点。一个显著的缺点是污染风险增加。由于曲轴暴露在外，灰尘、碎片和湿气很容易进入曲轴箱，导致潜在损坏并降低发动机寿命。为了减轻这种风险，定期维护和清洁是必不可少的，这可能对用户造成不便。另一个缺点是潜在的噪音水平增加。open crank case没有提供与封闭曲轴箱相同水平的声音绝缘，这可能导致操作时更响亮。对于噪音是个问题的应用，例如在居民区或夜间使用，这可能是一个重大问题。总之，选择open crank case与封闭曲轴箱设计之间的取舍取决于发动机的具体需求和应用。虽然open crank case提供了简单性、减轻重量和更好通风等好处，但它也带来了与污染和噪音相关的挑战。理解这些因素可以帮助工程师和制造商在设计各种用途的发动机时做出明智的决定。最终，曲轴箱的设计在发动机的整体性能和可靠性中起着至关重要的作用，使其成为汽车和机械工程中的一个重要考虑因素。