Coaxial Rotation Output Device with Central Cable Passage
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Solution Overview
Problem
Conventional rotation output devices cannot achieve a compact configuration due to the non-coaxial disposition of the reduction gear transmission with respect to the rotating disk, which limits the utilization of space for a columnar bar, hose, or cable, thereby preventing accurate rotation angle control and efficient space usage.
Innovation Solution
The use of an inner meshing planetary gear type reduction gear transmission allows the output shaft to be disposed coaxially with the rotating disk, enabling the passage of a columnar bar, hose, or cable through the external gear, thus ensuring accurate rotation angle control and compact device design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the output shaft of the reduction gear transmission is disposed parallel to the axis line of the rotating disk at a position separated by a distance, then a columnar bar or hose can pass through the rotating disk, but the device cannot achieve a compact configuration and space at the inner surface of the rotating disk cannot be utilized effectively
Solution Approach 1:
The patent merges the output shaft of the reduction gear transmission with the axis line of the rotating disk, making them coaxial. This allows the columnar bar to pass through both the rotating disk and the output shaft along the same axis, eliminating the need for separate offset positioning and effectively utilizing the space at the inner surface of the rotating disk.
Solution Approach 2:
Instead of the conventional approach where the output shaft is offset from the rotating disk axis, the patent inverts this arrangement by making the output shaft coaxial with the rotating disk axis. This inversion allows the columnar bar to pass through the center of the rotating disk and align with the output shaft, achieving compact configuration and effective space utilization.
2Device complexity
If the output shaft of the reduction gear transmission is disposed coaxially with the axis line of the rotating disk, then the device achieves compact configuration and effective space utilization, but conventional designs cannot ensure passage space for columnar bar, hose, or cable
Solution Approach 1:
The patent merges the passage space for the columnar bar with the coaxial arrangement of the output shaft and rotating disk. The columnar bar passes through the rotating disk and extends along the output shaft axis, utilizing the same spatial path and achieving both compact configuration and adequate passage space.
Solution Approach 2:
The patent resolves the space requirement by extending the columnar bar in the axial dimension along the coaxial output shaft, rather than requiring radial or offset passage space. This dimensional approach allows the passage function to coexist with the compact coaxial layout.
3Reliability
If a reduction gear transmission with large speed reduction ratio and small backlash is used, then position fixing reproducibility is improved, but the device cannot achieve accurate rotation angle control without additional components
Solution Approach 1:
The patent merges the rotation angle detection function with the coaxial output shaft structure. The columnar bar attached to the rotating disk rotates together with the disk and the output shaft, providing a reliable reference for rotation angle measurement that benefits from the small backlash of the planetary gear transmission.
Solution Approach 2:
The columnar bar acts as an intermediary element that connects the rotating disk to the output shaft rotation. It transfers the rotational motion and position information from the disk to the output shaft, enabling accurate rotation angle control while utilizing the reliable position fixing of the planetary gear transmission.
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 configuration eliminates backlash between the reduction gear transmission and the rotating disk, allows for accurate rotation angle control, and enables a compact device layout by utilizing the space at the rear surface of the rotating disk effectively.
Implementation Method 1
an inner meshing planetary gear type reduction gear transmission is utilized
Implementation Method 2
a crankshaft, an external gear, and an internal gear. The crankshaft includes an eccentric cam that rotates eccentrically when the crankshaft rotates
Data Source
AI summary
A compact rotation output device is realized by disposing an output shaft of a reduction gear transmission coaxially with an axis line of a rotating disk while simultaneously ensuring a space in a rear face of the rotating disk through which a columnar bar or wiring etc. can pass.A reduction gear transmission is provided with an input shaft having an eccentric rotation member, an external gear that has a through hole at its center and revolves orbitally while engaging with the eccentric rotation member, and an internal gear that surrounds the external gear while meshing with the external gear and allows the orbital revolution of the external gear. The number of teeth of the external gear differs from the number of teeth of the internal gear. The rotating disk is fixed to one of the external gear and the internal gear of the reduction gear transmission. The columnar bar is formed on the rotating disk, this columnar bar rotating together with the rotating disk, passing through the external gear, and extending longer than the input shaft.