Impact Tool Multi-Stage Planetary Gearset Speed Torque Adjustment
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Solution Overview
Problem
Existing impact tools require high-performance electrical components and are limited to specific working conditions due to electronic control of motor current for speed and torque adjustment, which restricts their applicability and efficiency.
Innovation Solution
Incorporation of a multi-stage transmission assembly with adjustable transmission ratios, including a first-stage and second-stage planetary gearsets, allows for mechanical adjustment of rotational speed and torque without altering motor output power, expanding the range of electric motors suitable for impact tools and enabling operation under various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic control is used to adjust motor current for speed and torque adjustment, then speed and torque can be adjusted, but high-performance electrical components are required and the tool is limited to specific working conditions
Solution Approach 1:
The patent replaces electronic control mechanisms with a mechanical transmission system featuring a planetary gearset. This mechanical approach allows for speed and torque adjustment through pure mechanical means, eliminating the need for high-performance electrical components and electronic control circuits, thereby reducing device complexity while maintaining adaptability to different working conditions
Solution Approach 2:
The patent changes the transmission ratio parameter through mechanical gear configuration rather than electronic control. By adjusting the engagement between planetary gears and sun gears, the transmission ratio can be mechanically varied to achieve different speed and torque outputs, allowing the tool to adapt to various working conditions without altering motor parameters
2Adaptability or versatility
If electronic control adjusts motor current to change rotational speed, then speed adjustment is achieved, but the range of electric motors suitable for impact tools is limited
Solution Approach 1:
The patent introduces a mechanical planetary gearset that can be matched with a wide range of electric motors by providing mechanical speed and torque adjustment. This mechanical transmission system decouples the motor selection from the output requirements, allowing engineers to select motors based on their inherent characteristics without being constrained by the need for electronic control matching, thereby expanding the range of suitable motors
Solution Approach 2:
The mechanical transmission system serves multiple functions: it provides speed reduction, torque multiplication, and impact generation. This multi-functionality allows a single transmission mechanism to work with various motor types and power levels, making the system universally applicable to different motor specifications and working conditions
3Adaptability or versatility
If multi-stage transmission assembly with adjustable transmission ratios is used, then mechanical adjustment of rotational speed and torque is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the transmission system into multiple planetary gearset stages, where each stage provides a specific transmission ratio. This segmentation allows for modular design and independent optimization of each gearset, making the overall system more manageable and easier to manufacture while achieving a wide range of adjustable transmission ratios through the combination of multiple stages
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 mechanical adjustment enhances motor efficiency, expands the range of electric motors usable in impact tools, and allows for operation across a wider range of working conditions, including the use of low-power motors, while maintaining high impact frequency and torque.
Implementation Method 1
a multi-stage transmission assembly with at least one stage having an adjustable transmission ratio, including a first-stage planetary gearset and a second-stage planetary gearset
Data Source
AI summary
An impact tool includes a motor shaft; an output shaft used for outputting power and rotating about an output axis; an impact mechanism for providing an impact force; and a transmission mechanism for transmitting power between the motor shaft and the impact mechanism. The transmission mechanism includes a multi-stage transmission assembly, at least one stage of transmission assembly in the multi-stage transmission assembly has an adjustable transmission ratio, and an output transmission ratio of the multi-stage transmission assembly is greater than 1. A rotational speed and torque of the tool are adjusted mechanically so that output power of an electric motor is unchanged, and motor efficiency is improved to a certain extent.