Elastic Member Absorbs Gear Force in Compact Driving Tool
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Solution Overview
Problem
Existing gas-spring type driving tools face challenges in designing a compact planetary gear device while maintaining the longevity of the gear housing due to the difficulty in absorbing the force applied by the gas pressure, which affects the durability and size constraints.
Innovation Solution
Incorporating an elastic member between the internal gear and the gear housing to absorb the force generated during the reverse motion of the driver, allowing for a reduced size of the planetary gear device along the motor axis and enhancing the longevity of the gear housing by efficiently distributing the applied force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the planetary gear device is designed to be compact along the motor axis, then the overall size of the driving tool is reduced, but the gear housing durability is compromised due to inability to absorb gas pressure force
Solution Approach 1:
An elastic member is introduced as an intermediary component between the internal gear and the gear housing. This elastic member absorbs the force generated by gas pressure during driver return motion, preventing direct transmission of harmful forces to the gear housing. The elastic member acts as a buffer that protects the gear housing while allowing compact design along the motor axis.
Solution Approach 2:
The elastic member is pre-installed between the internal gear and gear housing to provide beforehand cushioning. When the driver returns due to gas pressure, the elastic member is already in position to absorb and cushion the generated force, preventing damage to the gear housing before it can occur. This prior cushioning enables compact design without compromising durability.
2Length of stationary object
If the elastic member is disposed between the internal gear and gear housing, then the planetary gear device size is reduced along the motor axis, but the force absorption capability must be sufficient to protect the gear housing
Solution Approach 1:
The elastic member's physical parameters (material properties, dimensions, elasticity coefficient) are carefully selected and optimized to provide sufficient force absorption capability within a compact space. By changing the parameters of the elastic member, the system achieves both compact size along the motor axis and adequate force absorption to protect the gear housing during driver return motion.
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 elastic member effectively absorbs the force applied to the gear housing, improving its longevity and enabling a more compact design of the planetary gear device, thus enhancing the overall durability and efficiency of the driving tool.
Implementation Method 1
an elastic member disposed between an internal gear and the gear housing. The elastic member is configured to receive a force from the internal gear, which is generated when the electric motor rotates
Implementation Method 2
a planetary gear device configured to reduce a rotation output (e.g., speed) of the electric motor, thereby outputting a reduced rotation output (e.g., a reduced speed) to the wheel
Implementation Method 3
an electric motor configured to rotate the wheel by rotation of the electric motor
Implementation Method 4
The piston and the driver may move downward in a driving direction owing to a pressure of the gas filled in an accumulation chamber
Data Source
AI summary
An elastic member is disposed between an internal gear of a gear train and a gear housing. A force is applied to the gear train when a lift mechanism is activated. The force is received and absorbed by the elastic member, thereby reducing the amount of force received by the gear housing.