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(2)活塞和连杆FSI 发动机的曲柄连杆机构通过在试验台上和在整车上非常广泛的计算和测试进行了优化——一方面是从强度、重量和成本方面,另一方面是从减少摩擦、机油消耗、曲轴箱漏气和磨损方面进行的优化。活塞设计成盒式活塞,采用高耐热性的铝合金铸造而成,见图11。活塞销毂的内部几何形状与连杆头部的梯形形状相匹配。上部的区域为了节省重量而采用自由铸造法制成。活塞裙部涂敷了一层石墨。活塞通过机油喷溅器得到冷却。在油环的环槽中,在压力侧和背
(2) Pistons and connecting rods The crankshaft and connecting rod mechanism of the FSI engine is optimized by a very wide range of calculations and tests on the test rig and on the entire vehicle - on the one hand in terms of strength, weight and cost and on the other hand Optimized for friction reduction, oil consumption, crankcase leakage and wear. The piston is designed as a box piston and is cast from a highly heat-resistant aluminum alloy, see Figure 11. The internal geometry of the piston pin hub matches the trapezoidal shape of the connecting rod head. The upper area is made by free casting to save weight. Piston skirt coated with a layer of graphite. The piston is cooled by the oil splash. In the ring groove of the oil ring, on the pressure side and back