为探究轴向分区冷却方式对气缸套-活塞环摩擦功耗的影响，在考虑气缸套圆周方向不对称性、缸套活塞环表面粗糙度等因素的前提下，建立缸套-活塞环三维瞬态润滑数学模型，并应用此模型研究轴向分区冷却方式对气缸套-活塞环摩擦功耗的影响.结果表明：缸套上部加强冷却可以明显改善活塞环在上止点附近的润滑状态；缸套中部加隔热涂层时，在行程中部和下止点附近缸套-活塞环最小油膜厚度均有所减小；仅对缸套上部加强冷却或者仅在缸套中部加隔热涂层，均会导致缸套-活塞环的平均摩擦损失功率略微上升；同时对缸套上部加强冷却和缸套中部加隔热涂层，可以有效降低缸套-活塞环平均摩擦损失功率.研究结果可为进一步减少缸套-活塞环摩擦副的摩擦损失、提高缸套-活塞环工作可靠性提供设计依据.

In order to explore the influence of the axial partition cooling mode on the frictional power loss of cylinder liner-piston ring, in consideration of the asymmetry of cylinder liner circumferential direction and surface roughness of cylinder liner and piston ring, a three-dimensional transient lubrication mathematical model of cylinder liner and piston ring was established, and then used to investigate the influence of the axial partition cooling mode on the frictional power loss of cylinder liner-piston ring. The results show that the enhanced cooling on the upper part of the cylinder liner can significantly improve the lubrication of the piston ring near the top dead center. As result, the wear of the cylinder liner and the piston ring is reduced, and the working reliability of the cylinder liner-piston ring is improved. When the thermal barrier coating is deposited on the middle of the cylinder liner, the minimum oil films at the middle of the stroke and the bottom dead center are all decreased. When only the enhanced cooling on the upper part of the cylinder liner or the thermal barrier coating around the middle of the cylinder liner is conducted, the average friction loss power increases slightly. The average friction loss power decreases, if both the enhanced cooling on the upper part of the cylinder liner and the thermal barrier coating around the middle of the cylinder liner are conducted.