基于流体动力学的斜齿轮副搅油功率损失分析

Analysis of Churning Power Loss of Helical Gear Pair Based on Fluid Dynamics

在高速工况下,搅油损失在总功率损失中占很大比重,研究齿轮搅油功率损失对于提高传动效率具有重要意义。提出一种基于流体动力学的能够计算斜齿轮副搅油功率损失的计算模型,该模型采用将斜齿轮沿接触线划分为若干个薄直齿轮的方法计算斜齿轮副的搅油损失;将齿轮副搅油功率损失分为周面搅油功率损失、端面搅油功率损失以及啮合区挤压功率损失三部分,分析浸油深度、转速、螺旋角、齿宽、模数对搅油损失的影响以及各部分搅油损失占总搅油损失的比重。结果表明:搅油损失随着浸油深度、转速、螺旋角、齿宽、模数的增大而增大,其中转速、齿宽和模数对搅油损失的影响较大,浸油深度和螺旋角对搅油损失的影响较小;啮合区挤压功率损失在整个搅油功率损失中占最大比重。

Under high-speed operating conditions,the power losses of oil churning accounts for a large proportion of the total power loss,and studying the power loss of gear oil churning is of great significance for improving transmission efficiency.A computational model based on fluid dynamics was proposed,which can calculate the oil churning power loss of helical gear pairs.In this model,the oil churning loss of the helical gear pair can be calculated through dividing the helical gear into several small slices along the contact line.The churning power losses of a gear pair was divided into three parts,including the power loss due to oil drag on the periphery(circumference)of a gear,the power loss due to oil drag on the faces(sides)of a gear and the gear mesh pocketing power losses,and the influence of immersion depth,rotational speed,helical angle,tooth width and modulus on the churning power losses of a gear pair was analyzed.The results show that the churning power losses of a gear pair increases with the increase of immersion depth,rotational speed,spiral angle,tooth width and modulus.Among them,rotational speed,tooth width,and modulus have a greater impact on the oil churning power loss,while immersion depth and helix angle have a smaller impact on the oil churning power loss.The gear mesh pocketing power losses accounts for the largest proportion of the whole churning power losses of a gear pair.