Rotatable Cutting Elements with Roller Bearings for Earth-Boring Tools

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Solution Overview

Problem

Earth-boring tools face challenges in reducing friction and enhancing the freedom of rotation of cutting elements, which are essential for efficient drilling operations.

Innovation Solution

The implementation of rotatable cutting elements with a substrate and polycrystalline superabrasive material, surrounded by a sleeve and rollers that enable rolling contact and rotation, effectively reducing friction and allowing for increased freedom of rotation by bearing radial forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If cutting elements are secured within pockets of earth-boring tools, then the cutting elements can be held in place and transmit forces, but friction increases and freedom of rotation decreases

Engineering Contradiction:

Improvefreedom of rotationVSAvoidfriction

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The cutting element is designed to rotate dynamically within the pocket rather than remain fixed. The substrate is shaped to fit within the pocket while allowing rotational movement, transforming the static connection into a dynamic rotating joint that reduces friction and improves cutting performance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A bearing surface or interface is introduced between the cutting element substrate and the pocket wall. This intermediary interface allows the substrate to rotate freely while still transmitting radial and axial forces, effectively mediating between the need for rotation freedom and force transmission

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If cutting elements are made rotatable relative to the bodies within the pockets, then freedom of rotation increases, but the complexity of the structure increases

Engineering Contradiction:

Improvefreedom of rotationVSAvoidstructural complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The cutting element is segmented into distinct functional components: a substrate for mounting the superabrasive material, a rotational interface for reducing friction, and force transmission surfaces for bearing loads. This segmentation allows each component to be optimized independently while simplifying the overall structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The design introduces controlled rotational dynamics between the substrate and pocket, allowing the cutting element to rotate freely during operation. This dynamic capability is achieved through simplified geometric interfaces rather than complex mechanical bearings, reducing overall structural complexity

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If rollers are introduced to enable rolling contact and bear radial forces, then friction is reduced and rotation freedom increases, but the device complexity increases

Engineering Contradiction:

ImprovefrictionVSAvoidcomponent complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Rollers are introduced as intermediary elements between the substrate and pocket wall to enable rolling contact. These rollers bear radial forces and reduce friction by converting sliding friction into rolling friction, while their simple cylindrical geometry minimizes the added complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The design replaces complex mechanical bearing systems with simpler roller elements that achieve the same friction reduction and force bearing functions. This substitution simplifies the overall mechanism by using basic rolling contact geometry rather than elaborate bearing assemblies

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration reduces friction and enhances the rotational freedom of cutting elements, leading to improved drilling efficiency and effectiveness in earth-boring operations.

Implementation Method 1

Rollers may be sized and shaped for positioning between, and making rolling contact with, the substrate and the sleeve, the rollers configured to rotate relative to the substrate and the sleeve and to enable the substrate to rotate relative to the sleeve

Methodology Applied

Scientific EffectRolling contact: Roller

Implementation Method 2

the rollers configured to rotate relative to the substrate and the sleeve and to enable the substrate to rotate relative to the sleeve, the rollers configured to bear at least radial forces acting on the substrate and the sleeve

Methodology Applied

Scientific EffectFriction reduction: Friction

Data Source

PatentUS10450805B2Rotatable cutting elements including rolling-element bearings and related earth-boring tools and methods

Publication Date: 2019.10.22 BAKER HUGHES CO

AI summary

Rotatable cutting elements for earth-boring tools may include a substrate and a polycrystalline, superabrasive material secured to an end of the substrate. A sleeve may be sized and shaped to circumferentially surround at least a portion of the substrate. Rollers may be sized and shaped for positioning between, and making rolling contact with, the substrate and the sleeve, the rollers configured to rotate relative to the substrate and the sleeve and to enable the substrate to rotate relative to the sleeve. The rollers may be configured to bear at least radial forces acting on the substrate and the sleeve.