Pan Tilt Drive Backlash Reduction via Multi-Directional Shaft Displacement
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Solution Overview
Problem
Camera devices with dual stage reduction mechanisms face challenges in achieving accurate positioning due to backlash issues between gears, which degrade rotation transmission accuracy, especially in preset operations.
Innovation Solution
A pan tilt drive device incorporating a board, drive worm, terminal worm wheel, holder plate, shaft, intermediate worm wheel, intermediate worm, pivot mechanism, and biasing member, allowing for three-dimensional displacement of the shaft to concurrently align and press gears, reducing backlash and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a dual stage reduction mechanism is used to achieve greater reduction ratio, then the reduction capability is improved, but the backlash between gears increases and positioning accuracy deteriorates
Solution Approach 1:
The patent introduces a third dimension by allowing the shaft to displace not only in the radial direction (first direction) but also in the axial direction (second direction perpendicular to the first). This bi-directional displacement capability enables simultaneous alignment of both gear sets in a dual stage reduction mechanism, reducing backlash at both meshing points and improving positioning accuracy while maintaining the high reduction ratio
Solution Approach 2:
The patent changes the operational parameters of the shaft by enabling it to dynamically adjust its position in two directions (radial and axial) based on the meshing requirements of the gear sets. This parameter change allows the system to optimize the meshing state of both gear stages, minimizing backlash and improving transmission accuracy throughout the operation range
2Manufacturing precision
If a single stage reduction mechanism is used to minimize backlash, then the positioning accuracy is improved, but the reduction ratio is insufficient
Solution Approach 1:
The patent segments the reduction mechanism into multiple stages (dual stage reduction) while introducing a shaft capable of multi-directional displacement. This segmentation allows each gear set to be independently optimized for minimal backlash, while the shaft's displacement capability ensures both stages work together efficiently, achieving high reduction ratio without sacrificing positioning accuracy
3Manufacturing precision
If gears are displaced in a single plane to reduce clearance, then the backlash is reduced for single stage mechanisms, but concurrent displacement of multiple gear sets in dual stage mechanisms is difficult
Solution Approach 1:
The patent resolves the alignment complexity by adding another dimension of displacement to the shaft. Instead of trying to align multiple gear sets in a single plane (which is geometrically constrained), the shaft can displace in the radial direction to align one gear set and in the axial direction to align another gear set, simplifying the alignment process for dual stage 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
The solution effectively reduces backlash in the double stage reduction mechanism, enhancing the accuracy of rotation transmission and enabling precise positioning during preset operations in camera devices.
Implementation Method 1
a biasing member that is disposed across the board and the holder plate, and that biases the holder plate in a direction close to the drive worm and the terminal worm wheel
Data Source
AI summary
A pan tilt drive device includes a board, a drive worm that is rotatably supported by the board, a terminal worm wheel that is rotatably disposed relative to the board, a holder plate that is parallel to the board, a shaft that is rotatably supported while being parallel to the holder plate, an intermediate worm wheel that is fixed to one end of the shaft, and that meshes with the drive worm, an intermediate worm that is fixed to the other end of the shaft, and that meshes with the terminal worm wheel, a pivot mechanism, and a biasing member that biases the holder plate toward the drive worm and the terminal worm wheel.