| 毕玉华,黄承宇,杨跃山,等.不同配缸间隙下瓶颈型缸套预补偿设计对活塞动力学及摩擦特性的影响[J].内燃机工程,2026,47(1):54-64. |
| 不同配缸间隙下瓶颈型缸套预补偿设计对活塞动力学及摩擦特性的影响 |
| Influences of the Pre-Compensation Design of Bottleneck Cylinder Liner on Piston Dynamics and Friction Characteristics Under Different Cylinder Clearances |
| DOI： |
| 关键词:瓶颈形缸套 活塞动力学 摩擦 润滑 配缸间隙 |
| Key Words:bottleneck type cylinder liner piston dynamics friction lubrication cylinder clearance |
| 基金项目:云南省重大科技专项计划项目（202402AG050009）；国家自然科学基金项目（51765025）；基础性军工科研院所稳定支持项目（WDZC-2019-JGKK-01） |
|
| 摘要点击次数: 87 |
| 全文下载次数: 44 |
| 摘要:以某型非道路高压共轨柴油机气缸套为研究对象，基于弹性流体动力润滑理论和有限元方法，综合考虑柔性体弹性变形和表面粗糙度，建立活塞–连杆–曲轴–缸套的多体动力学仿真模型，系统分析瓶颈形缸套预补偿设计方案与原机的活塞动力学及裙部摩擦润滑特性差异，研究在不同配缸间隙下对活塞运动学及裙部摩擦润滑特性的影响。结果显示：瓶颈形缸套设计的活塞裙部平均摩擦损失减少64 W。在做功行程前期，活塞的最大偏摆角和径向位移分别增加了0.009°和1 μm，粗糙接触压力和摩擦损失略增，最小油膜厚度的极小值减少48 nm。配缸间隙从20 μm增大至80 μm时，活塞最大径向位移和偏摆角分别增加到177 μm和0.584°，总摩擦损失降低至128 W，最小油膜厚度的极小值降至15 nm，而平均粗糙接触压力极大值先降后增。瓶颈形缸套的设计在高载荷下活塞动力性能下降，但摩擦损失方面有显著改善；而较大配缸间隙可能降低油膜稳定性，增加粗糙接触风险。 |
| Abstract:Taking the cylinder liner of a type of non-road high pressure common rail diesel engine as the research object， based on the elastic hydrodynamic lubrication theory and the finite element method， a piston-connecting rod–crankshaft–cylinder liner multi-body dynamic simulation model were established based on comprehensive consideration of the elastic deformation and the surface roughness of the flexible body. And the differences between the pre-compensation design scheme of the bottleneck cylinder liner and the piston kinematics and the friction lubrication characteristics of the original engine were systematically analyzed. The influences of different cylinder clearances on the piston dynamics and skirt friction and lubrication characteristics were also studied. The results showed that the average friction loss of piston skirt was reduced by 64 W. In the early stage of the work stroke， the maximum deflection angle and the radial displacement of the piston were increased by 0.009° and 1 μm， respectively， the rough contact pressure and friction loss were slightly increased， and the minimum value of the minimum oil film thickness was reduced by 48 nm. When the cylinder clearance increased from 20 μm to 80 μm， the maximum radial displacement and the yaw angle of the piston increased to 177 μm and 0.584°， respectively， the total friction loss decreased to 128 W， the minimum value of the minimum oil film thickness decreased to 15 nm， in contrast the maximum value of the average rough contact pressure first decreased and then increased. The piston dynamic performance of bottleneck cylinder liner decreases under high loads， but the friction loss is improved significantly. However， large cylinder gap may reduce the oil film stability and increase the risk of rough contact. |
|
查看全文 HTML
查看/发表评论 下载PDF阅读器 |