Bidirectionally rotatable mechanism, bidirectional sander, and bidirectional cleaner
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Solution Overview
Problem
Conventional sanders operate unidirectionally, leaving marks and requiring repetitive back-and-forth sanding, which is laborious and inefficient.
Innovation Solution
A bidirectionally rotatable mechanism with an actuator, inner and outer shafts, and a speed reducer system that allows the outer shaft to rotate in the opposite direction to the inner shaft, utilizing planetary gears and a reduction gear assembly for bi-directional rotation, eliminating the need for repetitive sanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional unidirectional sanders are used, then the structure is simple, but marks are left and repetitive sanding is required
Solution Approach 1:
The patent applies dynamics by enabling the sanding head to rotate bidirectionally instead of unidirectionally. The transmission assembly allows the output shaft to reverse rotation direction, transforming the static unidirectional motion into dynamic bidirectional motion. This resolves the contradiction by achieving high-quality sanding without marks while managing the increased transmission complexity through a compact planetary gear design.
Solution Approach 2:
The patent employs nesting by placing the planetary reduction gear assembly inside the motor housing and integrating the transmission assembly within the sanding head structure. The inner shaft and outer shaft are nested concentrically, with the planetary gears nested within the ring gear. This nested arrangement achieves bidirectional rotation capability while minimizing the increase in overall device complexity and maintaining a compact form factor.
2Productivity
If bidirectional rotation is implemented, then sanding efficiency is improved and marks are eliminated, but transmission complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a planetary reduction gear assembly as a mediator between the motor and the output shaft. This intermediary mechanism translates the motor's unidirectional rotation into bidirectional output rotation through the planetary gear system. The intermediary gear assembly manages the complexity by providing a standardized, compact solution that achieves bidirectional motion without requiring multiple separate motors or complex linkage mechanisms.
Solution Approach 2:
The transmission assembly is designed with multi-functionality, serving both as a speed reducer and as a bidirectional rotation mechanism. The planetary reduction gear assembly simultaneously provides gear reduction and enables reverse rotation, consolidating multiple functions into a single integrated component. This universality reduces overall device complexity by eliminating the need for separate mechanisms for speed control and direction reversal.
3Loss of energy
If bidirectional rotation mechanism is added, then energy consumption is reduced, but device footprint increases
Solution Approach 1:
The patent applies nesting by integrating the planetary reduction gear assembly within the motor housing and positioning the transmission assembly components concentrically around the inner shaft. The outer shaft is nested within the transmission assembly housing, creating a compact layered structure. This nested arrangement minimizes the mounting footprint by utilizing vertical and radial space efficiently, preventing energy loss components from increasing the overall device volume.
Solution Approach 2:
The patent merges the speed reduction function and bidirectional rotation function into a single integrated transmission assembly. The planetary reduction gear assembly combines multiple gear stages and the reversal mechanism in one compact unit, rather than using separate components. This merging reduces the total volume required for the transmission system while maintaining the energy efficiency benefits of bidirectional rotation.
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
Achieves efficient sanding with no marks left, reduces energy consumption, and enhances sanding efficiency with a compact, portable design.
Implementation Method 1
the planetary reduction gear meshing with the inner ring gear and a transmission shaft
Implementation Method 2
the planetary gear meshing with the first gear, and a lower planetary carrier connected to the outer shaft; a support wheel is provided at a lower end of the support element
Data Source
AI summary
A bidirectionally rotatable mechanism, a bidirectional sander, and a bidirectional cleaner; the mechanism including an actuator, an inner and an outer shaft, the inner and outer shafts being actuated to rotate by the actuator, the outer shaft being sleeved outside the inner shaft; a speed reducer is arranged between an output shaft of the actuator and the inner shaft; two ends of the speed reducer are in transmission connection with the output shaft and the inner shaft, respectively; a first gear is arranged on an outer peripheral surface of the inner shaft; an outer transmission assembly in transmission connection with the outer shaft is arranged outside the inner shaft, the outer transmission assembly including a support element, an upper planetary carrier, a planetary gear meshing with the first gear, and a lower planetary carrier connected to the outer shaft, the planetary gear between the upper and the lower planetary carrier.