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首页> 外文会议>Society of Vacuum Coaters annual technical conference >Hard Coatings as a Design Element for Highly Stressed Engine Components
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Hard Coatings as a Design Element for Highly Stressed Engine Components

机译：硬质涂层作为高应力发动机组件的设计元素

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The tribological system cam/bucket tappet is one of the most highly stressed tribological systems in engines. It is therefore necessary to optimize this tribological system, particularly since four-valve technology has been introduced to a large number of vehicles. The valve train in combustion engines particularly in the lower speed range of up to approximately 2,000 rpm contributes significantly (up to 25 %) to the total friction losses in the engine. This effect can be reduced through design concepts (e. g. rolling contacts instead of sliding contacts) on the one hand and through low-friction and wear-resistant coatings on the other hand. This article presents a systematic overview of the valve train in general and the tribological system cam/bucket tappet in particular. Tribological coatings are viewed within a holistic and design-oriented context. A newly developed amorphous carbon coating, its characteristics as well as the technical and economical effects of its use in combustion engines are described. It is extremely important that coatings are considered as design elements and integrated in the product development process at a very early stage. Coatings must be customized for the individual tribological system or application. Tribological coatings in the valve train thus contribute to higher energy efficiency and lower fuel consumption of automobiles. Tribological coatings in combination with bucket tappets are a new concept for solving the conflict in valve trains between low friction on the one hand and low rigidity and higher costs on the other hand. The presented amorphous carbon coating systems CX+ and CH are excellent examples for such a tribological system. It allows a reduction in friction in the valve train by up to 50% in contrast to uncoated bucket tappet type valve trains. The carbon coatings offer the following advantages: 1. Super low friction 2. Customized surface energy 3. Optimized wetability 4. Low adhesion to cam In comparison to the hydrogen free ta-C PVD-coatings Triondur~® CX+ PACVD-coatings need no finishing after the coating process.
机译：摩擦系统凸轮/铲斗挺杆是发动机中压力最大的摩擦系统之一。因此，有必要优化该摩擦学系统，尤其是由于四气门技术已被引入大量车辆中。内燃机中的气门机构，特别是在最高转速约为2,000 rpm的较低转速范围内，对发动机中的总摩擦损失有明显的贡献（高达25％）。一方面可以通过设计概念（例如，滚动接触而不是滑动接触）来减小该影响，另一方面可以通过低摩擦和耐磨的涂层来减小这种影响。本文对气门机构进行了系统概述，特别是对摩擦系统凸轮/斗式挺杆进行了概述。摩擦涂层是在整体和面向设计的背景下进行观察的。描述了一种新开发的无定形碳涂层，其特性以及其在内燃机中使用的技术和经济效果。将涂料作为设计元素并在非常早期的阶段就集成到产品开发过程中，这一点极为重要。涂层必须针对个别的摩擦系统或应用进行定制。因此，气门机构中的摩擦涂层有助于提高汽车的能源效率和降低燃油消耗。摩擦涂层与铲斗挺杆相结合是一种新的概念，可以解决气门机构一方面在低摩擦力和低刚性之间的矛盾，另一方面又要解决成本较高的问题。提出的无定形碳涂层系统CX +和CH是此类摩擦学系统的出色示例。与未涂层的铲斗挺杆式气门机构相比，它可将气门机构的摩擦降低多达50％。碳涂层具有以下优点：1.超低摩擦2.定制的表面能3.优化的润湿性4.对凸轮的附着力与无氢ta-C PVD涂层相比，Triondur〜®CX + PACVD涂层无需精加工涂覆过程之后。

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