Modeling of Piston Ring-Cylinder Bore-Piston Groove Contact

Abstract

A three-dimensional piston ring model has been developed using finite element method with eight-node hexahedral elements. The model predicts the piston ring conformability with the cylinder wall as well as the separation gap between the interfaces if existing in the radial direction. In addition to the radial interaction between the ring front face and the cylinder wall, the model also predicts the contact between the ring and groove sides in the axial direction. This means, the ring axial lift, ring twist, contact forces with the groove sides along the circumferential direction are all calculated simultaneously with the radial conformability prediction. The ring/groove side contact can be found for scraper ring at static condition, which is widely used as the second compression ring in a ring pack. Thermal load is believed having significant influence on the ring pack performance. This thermal load influence is included in the model with a typical piston ring groove and cylinder wall temperature boundary condition. The modeling procedure and results are presented in this work. The model analyzes the piston ring performance with the consideration of the variation along the ring circumference, which has not been considered by the two-dimensional models widely used currently. This work describes a three-dimensional (3D hereafter) analytical ring model to address the pressure/force distribution between the ring-cylinder bore interface along the ring circumference direction. In

Power Cylinder System for Internal Combustion Engines

“…And the most important thing is how the contact force/pressure distributes along the ring circumference. Thus, in this section, the ring is specified constrained at 13 different cross-section locations along the circumference [21][22][23]. The ring conformability is modeled using finite element method (FEM) [24,25] for a keystone compression ring.…”

“…More details about the ring, cylinder liner, and piston groove interactions can be found from Refs. [22,23].…”

Lubrication analysis of the piston ring for the two-stroke marine diesel engine based on modified radial tension

“…The effectiveness of this method was verified. Cheng et al 13,14 developed a three-dimensional analysis model of the piston ring and proposed a force release method to calculate the radial contact pressure distribution between PRCL. To verify the model, they used two methods: the comparative radial tension contact method and light tightness method, respectively.…”