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内燃机零部件禁止使用铅作为合金元素的法规和降低发动机排放的法规相继实施,对轴瓦的设计和功能产生了十分重要的影响。现已证明,由于制造商趋向于采用起动-停车系统、混合动力、发动机小型化和低黏度机油等各种技术来降低发动机的燃油耗和排放,轴瓦的工作环境变得更具挑战性。发动机轴承通常是在液力润滑状态下工作的,但是,在采用上述技术的同时,要在不危及轴承系统耐久性的情况下延长轴承使用寿命,就不得不在混合润滑或边界润滑状态下工作。可以认为,商用车领域也将开始采用这些技术策略来达到规定的目标。针对这种颇具挑战性的轴承工作环境,Mahle公司开发了一种获专利的无铅聚合物轴瓦表面涂层。这种涂层的基体材料是一种高强度、耐高温、耐化学腐蚀的聚合物。在添加固态润滑剂、金属填充物、黏合增进剂和固化剂后,能使轴瓦具备理想的性能。试验台和发动机试验的结果证实,与传统无表面涂层的轴瓦材料相比,新开发的聚合物涂层材料具有良好的耐磨性和耐疲劳性。这种涂料适用于涂覆在被广泛使用的铝基和铜基底材上。着重阐述新技术对轴瓦工作环境的影响,并介绍一种能改善轴承系统可靠性和完整性的无铅聚合物涂层解决方案。
The ban on the use of lead as an alloying element in internal combustion engine parts and the regulations on reducing engine emissions have been implemented one after another, and have had a very significant impact on the design and function of the bush. It has been proven that the working environment of a bearing pad has become more challenging as manufacturers tend to adopt various technologies such as start-stop systems, hybrids, engine miniaturization and low viscosity oils to reduce engine fuel consumption and emissions. Engine bearings are usually operated hydraulically, but with these techniques, they have to be operated with mixed lubrication or boundary lubrication to extend bearing life without compromising the durability of the bearing system. It can be assumed that the commercial vehicle market will also begin to adopt these technical strategies to achieve the stated goals. In response to this challenging bearing environment, Mahle has developed a patented, lead-free polymer bearing pad coating. The base material for this coating is a high-strength, high-temperature, chemical-resistant polymer. With the addition of solid lubricants, metal fillers, adhesion promoters and curing agents, can make the bearing bush has the ideal performance. The results of the test rigs and engine tests confirm that the newly developed polymer coating materials have good wear and fatigue resistance compared to conventional non-surface coated bush materials. This coating is suitable for coating on widely used aluminum and copper based substrates. It focuses on the impact of the new technology on the working environment of the bearing bush and introduces a lead-free polymer coating solution that improves the reliability and integrity of the bearing system.