Good Price Diesel Engine Parts VE Pump Cam Disk 146220-0020 Cam Plate

Abstract:

The cam disk–plunger interface in high-pressure fuel pumps operates under extreme load and lubrication conditions, where repeated rolling–sliding contact induces complex wear, surface fatigue, and efficiency loss. Understanding the wear mechanism and predicting the fatigue life of the cam disk are essential for improving pump reliability and extending service lifespan.

This study investigates the tribological behavior and fatigue failure mechanism of the cam disk–plunger contact pair through a combination of theoretical modeling, numerical simulation, and experimental validation. A 3D elastohydrodynamic lubrication (EHL) model is established to analyze oil film pressure distribution, temperature rise, and surface deformation under varying cam rotational speeds and contact stresses.

The Archard wear law and contact fatigue theory are incorporated into a time-dependent wear prediction model, allowing for the estimation of material removal depth and surface roughness evolution during long-term operation. Finite element analysis (FEA) is used to evaluate the local stress concentration at the cam surface, and a rainflow counting-based fatigue life prediction approach is employed to assess cyclic loading effects.

Results show that at a contact stress exceeding 2.1 GPa, the oil film thickness drops below the critical boundary lubrication threshold, accelerating surface micro-pitting and abrasive wear. The optimized surface treatment—such as diamond-like carbon (DLC) coating and micro-texturing—effectively reduces the wear rate by 35% and extends the predicted fatigue life by 1.8 times compared to the untreated cam disk.

The proposed research provides valuable insights into the coupled wear–fatigue mechanisms of high-pressure cam systems and offers guidance for the design of durable, high-efficiency cam disk materials and surface engineering strategies used in next-generation automotive fuel injection pumps.