Planetary Quick Fastening Mechanism for Low-Friction Impact Drive
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Solution Overview
Problem
Existing quick fastening devices, such as nail guns, face issues with large deflection angles in their driving mechanisms, leading to increased friction and wear, which reduces the service life and efficiency of the product.
Innovation Solution
A quick fastening device with a driving mechanism that includes a fixed sun gear, a planetary gear, and a connecting rod module, where the planetary gear can spin relative to the crank and the connecting rod module can rotate relative to the planetary gear, minimizing the eccentric angle and reducing friction, utilizing a linkage element like an idler gear to ensure a straight trajectory for the engagement shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crank-connecting rod structure is used to convert rotational motion to reciprocating motion, then the driving mechanism can push the impact unit to compress the energy storage medium, but the connecting rod produces large deflection angles leading to increased friction and wear
Solution Approach 1:
The patent transforms the static crank-connecting rod structure into a dynamic planetary gear system where the connecting rod module can rotate relative to the planetary gear. This dynamic adjustment minimizes the deflection angle of the engagement shaft, keeping it close to a straight line trajectory, thereby reducing friction and wear on the impact unit while maintaining effective compression of the energy storage medium.
Solution Approach 2:
The patent changes the motion parameters by introducing a planetary gear mechanism with specific gear ratios (sun gear to planetary gear ratio of 2:1 or 3:1 to 8:1). This parameter change converts the large-angle oscillating motion of a conventional crank into a controlled planetary rotation, significantly reducing the deflection angle of the connecting rod and minimizing harmful friction forces.
2Reliability
If a conventional crank-connecting rod structure is used, then the mechanism can store and release energy, but the large swing angle of the connecting rod causes increased wear and reduced operational smoothness
Solution Approach 1:
The patent introduces dynamic rotation capability to the connecting rod module, allowing it to rotate relative to the planetary gear during operation. This dynamic adjustment optimizes the trajectory of the engagement shaft, minimizing deflection angles and ensuring smooth operation while reducing wear on moving parts through the reduced friction forces.
3Object-affected harmful factors
If the planetary gear rotates in the same direction as revolution, then the mechanism is simpler, but the connecting rod trajectory deviates from a straight line increasing friction
Solution Approach 1:
The patent introduces a linkage element (idler gear) as an intermediary between the sun gear and planetary gear. This idler gear acts as a mediator to reverse the rotation direction of the planetary gear relative to the sun gear, enabling the connecting rod to follow a straighter trajectory and minimize friction, while the idler gear itself handles the complexity of the directional control.
Data Source
AI summary
A quick fastening device, which comprises an energy storage medium, an impact unit, and a driving mechanism; the driving mechanism comprises a fixed sun gear, an output shaft not linked to the sun gear, a crank fixed on the upper end of the output shaft, a planetary gear installed on the crank in a spinning manner and capable of revolving around the sun gear as the crank rotates, and a connecting rod module mounted on the upper end of the planetary gear and connected to the impact unit. A linkage element is arranged between the planetary gear and the sun gear for driving the planetary gear to rotate in a direction opposite to the direction in which the planetary gear revolves relative to the sun gear.