Mechanical Engineering and Technology
Vol.3 No.03(2014), Article ID:14070,7 pages
DOI:10.12677/MET.2014.33013

Research on Piston Ring Lines under Free State

Zheng Li, Guitang Wang, Yongbin Chen, Tai Fu, Xiangbo Li

Information Engineering College, Guangdong University of Technology, Guangzhou

Email: 1114695123@qq.com

Received: Jul. 10th, 2014; revised: Aug. 6th, 2014; accepted: Aug. 15th, 2014

ABSTRACT

For engine piston ring, the outer round degree and end gap size are the important parameters, so most of the manufacturing enterprises do full inspection to them. Current test methods are testing in ring gauge imitating piston ring in the cylinder liner working state. In order to improve the efficiency of the piston ring detection, people pay more attention to do test when engine piston ring is under free condition. According to the radial stress curve received by piston ring in the working state, with the condition of the invariant neutral axis before and after bend, the radial displacement and angle displacement of each point when engine piston ring returns to free condition from compression condition are deduced, and thus the piston ring lines of free condition under such pressure curve are obtained. Finally, we select a certain type of piston ring of a factory; according to the radial pressure distribution in working, parameters are set and simulated for the derived formulas in this paper; and the error analysis is made between the simulation results and the original image. The result shows that the simulation results and the original error are within the accuracy, so this method can be used to detect piston ring clearance and roundness.

Keywords:Piston Ring, Radial Stress, Curve Model

Email: 1114695123@qq.com

1. 引言

2. 活塞环径向压力分布类型

2.1. 活塞环压力均匀分布

2.2. 活塞环压力不均匀分布

2.2.1. 高点环

2.2.2. 低点环

3. 活塞环径向压力分布表达式的推导

3.1. 弯梁的建立

. (1)

3.2. 活塞环压力分布函数表达式的建立

(2)

dP在X，Y轴的两个分量

(H，为定值)。

(4)

3.3. 径向位移与弯矩的关系

P：极坐标下自由型线的矢径，

(5)

3.4. 活塞环弯矩表达式

,

Figure 1. Ring radial pressure diagram

(6)

(7)

(8)

(9)

3.5. 模型分析

3.6. 仿真结果

Figure 2. Relationship between the radial displacement and bending moment

Figure 3. Relationship with angular displacement and radial displacement

Figure 4. Piston ring inside the ring gauge state diagram

Figure 5. Piston ring state diagram under free state

Figure 6. The simulation curve

Figure 7. Error analysis diagram

4. 结论

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