小尺寸单牙轮钻头轴承设计研究

A STUDY OF BEARING DESIGN ABOUT MONOCONE BITS

目前，在我国单牙轮钻头的结构设计还没有标准系列，因此本文应用有限元法，建立了小尺寸单牙轮钻头轴承的力学模型，并推导出了轴承与牙轮接触区域的分布载荷ｐ（θ）的具体表达式，突破了常规的集中载荷法的钻头轴承设计。文中所建立的有限元力学模型，可对轴承内部的应力进行详细地分析，并能确定出轴承内的危险点及危险区域，为轴承强度设计提供理论依据。同时文中给出了轴倾角β＝３０°时，小尺寸单牙轮钻头结构尺寸系列及其相应的屈服钻压和设计钻压。

By the application of the finite element method,the mechanical models of the bearing of small size monocone bits have been established,and the concrete equation of the distribution load P(θ) is derived in the region of the bearing contacting with conebit,and the monocone bit bearing design of the conventional concentrating load method is broken through,at the same time,the paper gives the series of the structure dimensions of the small size monocone bit and their yielding weight and design weight.