Scissors Gear Actuator Assembly With Pre-Aligned Tooth Engagement
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Solution Overview
Problem
The manufacturing of actuators with speed reduction mechanisms involving scissors gears is complicated due to the angular misalignment of gear teeth, which complicates the engagement and incorporation of gears into a gear case.
Innovation Solution
A manufacturing method that involves attaching an elastic member to the scissors gear and first gear to align their angular positions, fixing them using a fitting member, and then releasing the fixation to facilitate the engagement of the second gear with the first and scissors gears within a gear case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the spring urges the scissors gear to eliminate backlash, then noise and vibration are suppressed, but the angular positions of gear teeth become misaligned, making assembly complicated
Solution Approach 1:
The patent applies preliminary action by pre-aligning the angular positions of the first gear and scissors gear using a fixing member before incorporating them into the gear case. This preliminary alignment ensures that when the spring is later installed to eliminate backlash, the gears are already in the correct angular relationship, simplifying the overall assembly process while maintaining the noise and vibration suppression benefits
Solution Approach 2:
The fixing member acts as an intermediary tool that temporarily holds the angular positions of the gears during assembly. This intermediary device enables precise angular alignment between the first gear and scissors gear without requiring complex adjustment mechanisms, thereby reducing assembly complexity while preserving the backlash-elimination function of the spring
2Reliability
If the angular positions of gear teeth are misaligned due to spring urging, then backlash is eliminated, but the work of engaging gears becomes complicated
Solution Approach 1:
The patent performs preliminary alignment of the gear angular positions using a fixing member before the final assembly step. This preliminary action ensures that the gears are correctly positioned relative to each other, making the subsequent engagement process simple and straightforward while maintaining the reliable backlash elimination provided by the spring mechanism
3Device complexity
If multiple gears are incorporated into the gear case without angular position fixation, then assembly is simpler, but gear tooth alignment is imprecise
Solution Approach 1:
The patent implements preliminary action by fixing the angular positions of the first gear and scissors gear relative to each other before incorporating them into the gear case. This preliminary fixation ensures precise gear tooth alignment is achieved while keeping the assembly process simple, as the gears are already aligned when placed in the gear case without requiring complex adjustment procedures
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 method simplifies the incorporation of multiple gears into the gear case by ensuring precise alignment of gear teeth, reducing assembly complexity and facilitating the manufacturing process.
Implementation Method 1
a step of attaching an elastic member for urging the scissors gear in a rotational direction to the scissors gear and the first gear
Data Source
AI summary
A work of incorporating a speed reduction mechanism including a scissors gear into a gear case is facilitated. In a state where the angular positions of gear teeth of a first gear and the angular positions of gear teeth of a scissors gear are made to coincide with each other against the elastic force of a torsion spring (19), these angular positions are fixed by a fixing member (position fixing step). The first gear, the scissors gear, and a second gear are housed in a gear case, and the gear teeth of the second gear are made to engage with the gear teeth of the first gear and the gear teeth of the scissors gear (gear incorporating step). The fixing of the angular position of the first gear and the angular position of the scissors gear by the fixing member is released through an opening formed in the gear case.