Planetary Drill Transmission for Compact High-Power Load Sharing
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Solution Overview
Problem
Conventional electric drills using gasoline engines suffer from vibration, noise, occupational health issues, low energy efficiency, and environmental pollution, while DC electric drills with gear transmission mechanisms face challenges of large size and uneven load during high-power applications.
Innovation Solution
A transmission mechanism for electric drills featuring a primary planet carrier with multiple planetary gear shafts, a sun gear, and a secondary gear assembly with a uniform load distribution, utilizing overlapping primary planetary gear sets and a gear box with positioning ribs and fixing portions for secure assembly, allowing for compact size and even load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a parallel shaft spur gear transmission mechanism is used in high-power applications, then the transmission capacity is improved, but the volume of the gear transmission box increases
Solution Approach 1:
The patent employs a planetary gear transmission mechanism where multiple gear sets are nested within a compact housing. The planetary gears are arranged concentrically around a central sun gear, allowing multiple gear stages to be nested in a radial configuration rather than requiring linear spacing as in parallel shaft mechanisms. This nesting arrangement achieves high transmission capacity while minimizing the overall volume of the transmission box.
2Power
If the modulus of the transmission gear is increased to meet high-power requirements, then the transmission capacity is improved, but the volume of the gear transmission box increases
Solution Approach 1:
The patent divides the transmission system into multiple planetary gear sets, each handling a portion of the total load. Instead of using a single large-modulus gear, the system segments the power transmission across several smaller planetary gear sets working in parallel. This segmentation allows the transmission capacity to be increased by adding more gear sets rather than enlarging individual gears, thereby maintaining a compact transmission box volume while meeting high-power requirements.
3Device complexity
If a conventional gear transmission mechanism is used, then the structure is simple, but the load distribution during transmission is uneven
Solution Approach 1:
The patent employs a planetary gear mechanism where the planetary gears rotate on their own axes while simultaneously orbiting the sun gear. This dynamic motion allows the planetary gears to automatically adjust and distribute loads evenly across all contact points during transmission. The symmetric arrangement of multiple planetary gears ensures uniform load distribution, improving reliability while maintaining relatively simple structural implementation through standardized component design.
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 solution results in a smaller, easier-to-assemble electric drill with uniform load distribution during high-power transmission, extending the service life of the transmission mechanism and the drill.
Implementation Method 1
a primary gear set comprises at least two primary planetary gear sets; the at least two primary planetary gear sets are pivotably mounted on the primary planetary gear shaft, an outer side of the primary planetary gear set engages with the primary gear ring, and an inner side of the primary planetary gear set engages with a central gear arranged on a motor output shaft
Data Source
AI summary
The invention provides a transmission mechanism for an electric drill and the electric drill including the transmission mechanism. The transmission mechanism includes a primary planet carrier, a gear assembly, a secondary planet carrier, and a secondary gear assembly. The gear assembly comprises a primary gear ring and a primary gear set located in the primary gear ring. The primary gear set has two primary planetary gear sets mounted on the primary planetary gear shaft. The secondary planet carrier is provided with secondary planetary gear shafts and an output shaft. The secondary gear assembly includes a secondary gear ring and a secondary planetary gear set. The secondary planetary gear set is pivotably mounted on the secondary planetary gear shafts, an outer side of the secondary planetary gear set engages with the secondary gear ring, and an inner side of thereof engages with the sun gear.