Driver Drill Dual Planetary Gearing for Multi-Speed Torque Switching
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Solution Overview
Problem
Existing electric work machines, such as driver drills, face challenges in switching between high speed and high torque modes efficiently, as current technologies struggle to set appropriate speed modes based on the details of operations.
Innovation Solution
The electric work machine incorporates a dual planetary gear mechanism with different reduction ratios and speed switch mechanisms to allow switching between low, medium, and high speed modes by adjusting the operation of the first and second planetary gear mechanisms, enabling operators to set appropriate speed modes according to specific tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the planetary gear is set to the high speed mode, then the driver drill can perform an operation at high speed, but it may be difficult for the driver drill to perform an operation that requires high torque
Solution Approach 1:
The planetary gear mechanism is divided into two independent speed control mechanisms: a first speed switch mechanism controlling the first planetary gear mechanism, and a second speed switch mechanism controlling the second planetary gear mechanism. Each mechanism can independently select between different reduction ratios, allowing the system to achieve multiple speed modes (high speed, medium speed, low speed) while maintaining the ability to provide high torque when needed.
2Force
If the planetary gear is set to the low speed mode, then the driver drill can perform an operation that requires high torque, but it may be difficult for the driver drill to perform an operation at high speed
Solution Approach 1:
The patent implements dynamic speed mode switching by allowing the operator to select between different speed reducing modes in real-time based on operational requirements. The first and second speed switch mechanisms enable the system to dynamically adjust the reduction ratio, transitioning between high speed/low torque and low speed/high torque modes as needed during operation.
3Adaptability or versatility
If a single planetary gear mechanism is used, then the device complexity is reduced, but the adaptability to different operation details is insufficient
Solution Approach 1:
The patent employs a nested configuration where the second planetary gear mechanism is disposed forward of the first planetary gear mechanism, and the second planetary gear mechanism is operated by the rotational force of the first planetary gear mechanism. This nested arrangement allows both gear mechanisms to work together in a compact structure, achieving multiple speed modes without proportionally increasing device complexity.
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 allows for efficient switching between speed modes, enhancing the machine's ability to perform tasks requiring high torque or high speed by optimizing the gear mechanisms and switch mechanisms, thereby improving operational flexibility and effectiveness.
Implementation Method 1
a first planetary gear mechanism (31), and a second planetary gear mechanism (32)... A reduction ratio of the first stage unit and the reduction ratio of the second stage unit are different from each other
Data Source
AI summary
An electric work machine includes: a motor; a first planetary gear mechanism; a second planetary gear mechanism; a spindle; a first speed switch mechanism including a first internal gear of a first stage unit and a second internal gear of a second stage unit; and a second speed switch mechanism. The first speed switch mechanism performs switching between a first speed reducing mode in which rotation of the second internal gear is prevented and rotation of the first internal gear is allowed and a second speed reducing mode in which rotation of the first internal gear is prevented and rotation of the second internal gear is allowed. The second speed switch mechanism performs switching between an enabled mode in which rotation of an internal gear of the second planetary gear mechanism is prevented and a disabled mode in which the rotation of the internal gear is allowed.