Ring Bit Protrusion Geometry for Compact Locking in Drilling Tools
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Solution Overview
Problem
Conventional drilling tools with ring bits require long locking elements to withstand striking and pulling forces, leading to elongated ring bits that are inefficient in design and functionality.
Innovation Solution
The ring bit is designed with a protrusion forming a ring bit pulling surface along the longitudinal axis, where the first length of the protrusion at a first surface is greater than the second length at a second surface, allowing for a shorter ring bit while maintaining strength and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If locking elements are made long to withstand striking and pulling forces, then strength and reliability are improved, but the ring bit length increases and design efficiency deteriorates
Solution Approach 1:
The protrusion is designed with non-uniform dimensions along its length, creating local variations in structural properties. The first portion has greater dimensions for enhanced strength where locking forces are applied, while the second portion tapers to reduce overall length, resolving the contradiction between strength requirements and length minimization
Solution Approach 2:
The pulling surface is oriented at an angle relative to the longitudinal axis of the ring bit, introducing a dimensional transformation. This angular orientation allows the protrusion to withstand pulling forces more efficiently, reducing the required length along the longitudinal axis while maintaining locking strength
2Productivity
If ring bit length is reduced for compactness, then productivity and design efficiency are improved, but locking strength may deteriorate
Solution Approach 1:
Instead of uniform reduction, the protrusion concentrates its material distribution in the first portion where locking forces are applied, creating local structural optimization. This allows the overall length to be reduced while maintaining sufficient locking strength at the critical locking interface
Solution Approach 2:
The protrusion combines different geometric configurations along its length - a robust first portion for locking and a tapered second portion for length reduction - creating a composite structural form that optimizes both strength and compactness simultaneously
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A ring bit (3) comprises an annular or cylindrical shape. The ring bit (3) is configured to be provided around a pilot bit (2) at a distal end (5) of a drilling tool (1) concentrically with the pilot bit (2). The ring bit (3) comprises at least one protrusion (6) protruding inwards from a first surface (7) provided inside the ring bit (3), and at least one ring bit pulling surface (13), which ring bit pulling surface (13) is formed in the protrusion (6) and formed in relation to a radial direction (14) of the ring bit (3) in a direction of a longitudinal axis (4) of the drilling tool (1) in such a manner that a first length (16) of the protrusion (6) at the first surface (7) in the direction of the longitudinal axis (4) is greater than a second length (20) of the protrusion (6) at a second surface (15). The second surface (15) is defined by the inner-most surface of the protrusion (6) and the first surface (7) is provided at the base of the protrusion (6) on the pulling surface (13) side of the protrusion (6).