Purpose

This study aims to present the discrepancy in oil film distribution in reciprocating motion experimentally with zero entraining velocity (ZEV) on a conventional ball-disk test rig with oil lubrication.

Design/methodology/approach

Driven independently by two individual servomotors, a steel ball and a sapphire disc move at equal speed but in opposite directions in a triangle wave. The oil film images between the ball and the disc were recorded by a camera. After the experiments, the mid-section film thickness was evaluated by using a dichromatic interference intensity modulation approach.

Findings

The dimpled oil film in transient condition is shallower than that at steady state with the same load and velocities, and the transient dimple depth decreases with the decrease of time. The increase of the applied load offers a beneficial effect on lubrication. Boundary slippage happens in ZEV reciprocating motion. The slippage at the interface is related to the transient effect and applied load.

Originality/value

This study reveals the significant difference of the oil film variation in ZEV reciprocating motion, especially the complex boundary slippage at the interface of the oil and the sapphire disc.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0021

中文翻译：

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ZEV往复运动中观察到的油膜分布差异

目的

这项研究的目的是在传统的带油润滑的球盘试验台上以零夹带速度（ZEV）实验性地展示往复运动中油膜分布的差异。

设计/方法/方法

钢球和蓝宝石圆盘由两个独立的伺服电机独立驱动，以相同的速度但以相反的方向在三角波中移动。球和圆盘之间的油膜图像由照相机记录。实验之后，通过使用双色干涉强度调制方法评估中间部分的膜厚度。

发现

在相同的载荷和速度下，瞬态条件下的油膜比稳态下的油膜浅，瞬态酒窝深度随时间的减少而减小。施加载荷的增加对润滑具有有益作用。ZEV往复运动会发生边界滑移。界面处的滑移与瞬态效应和施加的负载有关。

创意/价值

这项研究揭示了ZEV往复运动中油膜变化的显着差异，特别是在油和蓝宝石圆盘的界面处复杂的边界滑移。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-01-2020-0021