Miniature Handheld Electric Traction Device with Nested Planetary Gear
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Solution Overview
Problem
Existing miniature handheld electric traction devices have a layout structure that is not optimized for size reduction, with the winding drum and transmission gear set being inefficiently arranged, leading to a larger overall size and limited convenience.
Innovation Solution
A miniature handheld electric traction device design featuring a shell with a power motor, reduction gear set, and winding drum, where the power motor and winding drum are coaxially arranged with a planetary gear system, and a brake mechanism with a variable-diameter spring for compactness and safety, along with a control circuit and emergency stop switch for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the winding drum and transmission gear set are arranged in parallel with side-by-side deviation, then the layout is simple to implement, but the overall size of the device cannot be effectively reduced
Solution Approach 1:
The patent applies nesting by placing the transmission gear set inside the winding drum structure. The planetary gear set is positioned within the hollow interior of the winding drum, allowing the gear set to be nested within the drum's volume rather than occupying separate side-by-side space. This nested arrangement significantly reduces the overall device footprint while maintaining functional independence of both components.
Solution Approach 2:
The patent merges the winding drum and transmission gear set into a single integrated structural unit. The gear set is mounted within the drum's hollow space, and both components share common mounting structures and support mechanisms. This merging of previously separate parallel arrangements into a combined configuration reduces the total volume occupied by these components.
2Volume of moving object
If the winding drum and motor are positioned at side-by-side deviation, then the arrangement is easy to manufacture, but the span position is large and the overall size cannot be reduced
Solution Approach 1:
The motor is positioned within the hollow interior of the winding drum, nesting the motor inside the drum structure rather than placing it beside the drum. This nested arrangement eliminates the need for large span positions between motor and drum while maintaining manufacturing feasibility through standard mounting procedures within the drum's internal space.
Solution Approach 2:
The patent transitions from a two-dimensional side-by-side arrangement to a three-dimensional nested configuration. Instead of placing the motor in the same plane as the drum (side-by-side), the motor is positioned within the vertical/hollow space of the drum, utilizing the third dimension to reduce the device's overall footprint while maintaining manufacturing accessibility.
3Ease of operation
If a traditional layout structure is used, then the device is stable and reliable, but the device complexity increases and portability is reduced
Solution Approach 1:
The patent applies nested doll principle by placing the motor inside the winding drum's hollow space, creating a compact handheld structure. This nested arrangement dramatically reduces the device's external dimensions and weight, making it portable and suitable for handheld operation, while the internal nesting maintains structural stability and component reliability.
Solution Approach 2:
The patent transforms the device from a fixed-point heavy structure to a dynamic handheld tool through compact nested arrangement. The reduced size and weight enabled by nesting allow the device to be easily held and maneuvered by hand, providing dynamic portability while maintaining the stability needed for reliable traction operations.
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 design significantly reduces the length and size of the traction tool, improves safety with double brake protection and emergency stop control, and ensures efficient winding of the traction rope with a high winding ratio, preventing knotting.
Implementation Method 1
the brake part further may include a variable-diameter rectangular spring, the variable-diameter rectangular spring may be inserted into the space, and the variable-diameter rectangular spring distributedly abuts the inner wall of the inner cylinder sleeve and the outer surface of the connecting shaft sleeve
Implementation Method 2
the reduction gear set may include a planetary gear, the sun gear of the planetary gear may be coaxial with the winding drum, the winding drum may be in transmission connection with the planetary gear
Implementation Method 3
the power motor may be linked with the winding drum via the reduction gear set, the power motor or the motor shaft of the power motor may be inserted into the inner ring of the winding drum
Data Source
AI summary
A miniature handheld electric traction device including a shell, a power supply part, a power motor, a reduction gear set, a braking part and a winding drum, wherein the power motor, the reduction gear set and the winding drum are arranged in the shell; the power motor is linked with the winding drum through the reduction gear set; a surface of the winding drum is wound with a traction rope; the reduction gear set includes a planetary gear; the sun gear of the planetary gear is coaxial with the winding drum; the power motor or the motor shaft of the power motor is inserted into the inner ring of the winding drum; the motor shaft is linked with the planetary gear.