Integrated Motor Speed Reducer for Direct Drill Bit Drive
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Solution Overview
Problem
Existing coring devices have low transmission efficiency due to separate electric motors and speed reducers connected via flexible shafts, which are prone to breaking and require complex structures with multiple power sources, leading to high maintenance costs and inefficiencies in high-temperature and high-pressure environments.
Innovation Solution
An integrated electric motor and speed reducer structure directly drives the drill bit, with a wire protection device and a simplified motion control mechanism using hydraulic oil cylinders and sliding plates to achieve efficient stretching and turning motions, reducing the need for multiple power sources and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electric motor and speed reducer are separate elements connected via flexible shaft, then the structure is more modular and easier to manufacture, but the transmission efficiency is lower and the reliability is reduced due to flexible shaft breaking and bending
Solution Approach 1:
The patent merges the electric motor and speed reducer into a single integrated drive unit, eliminating the flexible shaft connection. The motor output shaft is directly coupled to the speed reducer input, creating a rigid direct-drive configuration that improves transmission reliability while maintaining manufacturing feasibility through modular assembly of the integrated unit.
2Productivity
If the electric motor and speed reducer are integrated directly, then the transmission efficiency is improved and reliability is enhanced, but the device complexity increases and volume increases
Solution Approach 1:
The integration of motor and speed reducer into one compact unit reduces the number of external connections and components, actually simplifying the overall drive structure despite the internal complexity of the combined unit. The direct coupling eliminates intermediate transmission elements.
3Ease of operation
If four hydraulic cylinders are used to jack the frame for drill bit stretching, then the stretching function is achieved, but the structure becomes complex and multiple power sources are needed
Solution Approach 1:
The integrated drive unit serves multiple functions: it provides both the rotational driving torque for coring and the axial stretching force through its structural design. The motor-speed reducer assembly is configured to simultaneously accomplish rotation and longitudinal movement, eliminating the need for separate hydraulic stretching systems.
4Adaptability or versatility
If separate hydraulic systems are used for stretching and rotating, then the functions are independent and controllable, but the maintenance cost increases and the structure is complex
Solution Approach 1:
The patent combines stretching and rotating functions into a single integrated drive mechanism. The motor-speed reducer unit performs both axial stretching and rotational coring operations through its unified structure, reducing the number of independent systems from two (hydraulic stretching + motor rotating) to one integrated system, thereby lowering maintenance requirements.
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
The integrated structure significantly improves transmission efficiency, simplifies the coring mechanism, reduces maintenance costs, and adapts better to high-temperature and high-pressure environments, while ensuring reliable operation of the drill bit during stretching and turning motions.
Implementation Method 1
the sliding plates horizontally slide along an axial direction of the coring structure under the pushing from the hydraulic oil cylinders
Data Source
AI summary
The present application provides a sidewall coring structure directly driven by an electric motor comprising a drill bit, an electric motor and a speed reducer, the electric motor and the speed reducer are an integrated structure and the drill bit is directly connected to an output of the speed reducer. The coring structure directly drives the drill bit through an integrated structure of the speed reducer and the electric motor; its transmission efficiency is greatly improved, meanwhile the coring structure is more simplified, with improved reliability, easier maintenance and reduced maintenance cost.