Planetary Gear Fastener Driver for Low-Friction Impact Motion
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Solution Overview
Problem
Traditional fastening machines with crank-connecting rod structures experience large deflection angles and friction forces, leading to wear and increased complexity, especially when converting rotary motion to reciprocating motion for energy storage and release.
Innovation Solution
The implementation of an annular gear-crank-planetary gear structure, where a planetary gear connected to a crank revolves within an annular gear, with an engaging shaft to drive an impact unit, providing a more efficient conversion of rotary motion to reciprocating motion, minimizing friction and wear, and allowing for quick energy release without structural detaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a crank-connecting rod structure is used to convert rotary motion to reciprocating motion, then the motion conversion function is achieved, but large deflection angles cause large friction forces and wear
Solution Approach 1:
The patent changes the geometric parameters of the mechanism by using a cam profile with specific curvature radius ratios (ρ/(ρ-e) where e is eccentricity). This parameter optimization reduces the deflection angle during motion conversion, thereby minimizing friction forces and wear on the driven parts while maintaining effective reciprocating motion.
Solution Approach 2:
The patent replaces the traditional crank-connecting rod mechanism with a cam-based driving mechanism. This substitution eliminates the large deflection angles inherent in crank-connecting rod structures, significantly reducing friction forces and wear on the impact unit and other driven components.
2Speed
If a release element is installed to quickly release the driving mechanism after compressing the energy storage unit, then quick energy release is achieved, but the structure becomes more complicated
Solution Approach 1:
The cam-based driving mechanism automatically achieves quick release of the energy storage unit through its inherent geometric design. As the cam rotates, the follower naturally disengages at the appropriate point in the rotation cycle, eliminating the need for separate release elements or control mechanisms while maintaining fast energy release capability.
Solution Approach 2:
The patent extracts and eliminates the release element from the system by designing the cam profile to inherently provide both compression and release functions. The cam's geometric shape automatically controls the timing and speed of energy storage compression and subsequent release, removing the need for additional release mechanisms.
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 solution reduces friction forces, stabilizes the impact unit's operation, improves working quality, and simplifies the structure by minimizing unbalanced loads and eliminating the need for complex release mechanisms, enhancing market competitiveness.
Implementation Method 1
the planetary gear is placed in the annular gear to mesh with the annular gear
Implementation Method 2
an engaging shaft eccentrically connected to the planetary gear to push the impact unit
Data Source
AI summary
A fastener driving machine, which comprises an energy storage unit; an impact unit used to drive the energy storage unit to store energy and withstand the energy released by the energy storage unit to drive fasteners into a workpiece; a driving mechanism connected to the impact unit; a rotating power mechanism connected to the driving mechanism to provide rotating power to the driving mechanism. The driving mechanism comprises a stationary annular gear, a crank connected to the rotating power mechanism, and at least one planetary gear which is connected to the crank in a spinning manner and revolves with the rotation of the crank relative to the annular gear, and an engaging shaft eccentrically connected to the planetary gear to push the impact unit. The planetary gear is placed in the annular gear to mesh with the annular gear.