Single-Stage Planetary Winch for High Speed Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric winches for automobiles have complex power transmission devices with low efficiency, high self-weight, and high manufacturing and assembly costs, along with complicated braking mechanisms that are difficult to maintain.
Innovation Solution
A winch design employing a single-stage planetary mechanism for power transmission with a simple structure, high efficiency, and low weight, along with a simplified braking system that is cost-effective and reliable, using a motor, drum, power transmission device, planetary mechanism assembly, and a braking device with a transmission gear shaft and planetary gears that can be easily engaged or disengaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multi-stage series-connected planetary mechanism is employed to achieve deceleration function with large speed ratio, then the speed ratio is achieved, but the structure becomes complicated with low transmission efficiency
Solution Approach 1:
The patent divides the planetary mechanism into multiple independent planetary gears (first, second, and third planetary gears) that can be selectively engaged or disengaged. Each planetary gear can operate independently or in combination, allowing the system to achieve large speed ratios through selective engagement rather than requiring multiple stacked planetary stages, thus simplifying the overall structure while maintaining high transmission efficiency.
Solution Approach 2:
The patent employs a movable transmission gear shaft that can shift positions to engage or disengage different planetary gears dynamically. This dynamic engagement mechanism allows the system to achieve variable speed ratios on demand without requiring a fixed multi-stage configuration, reducing structural complexity while maintaining the ability to achieve large speed ratios when needed.
2Speed
If a multi-stage series-connected planetary mechanism is employed, then deceleration function is achieved, but the self-weight of the winch increases
Solution Approach 1:
The patent merges multiple planetary gear functions into a single-stage configuration where first, second, and third planetary gears share common components (such as the sun gear and ring gear). This consolidation allows the system to achieve the deceleration function with large speed ratio using fewer components and less material, thereby reducing the self-weight of the winch compared to multi-stage configurations.
3Reliability
If a complicated braking mechanism is used, then braking function is achieved, but manufacturing and assembling become complicated with high cost and high failure rate
Solution Approach 1:
The patent designs the braking mechanism to automatically engage when the transmission gear shaft moves to the disengaged position. The braking force is generated through the interaction between the transmission gear and planetary gears without requiring separate complex braking components. This self-service braking mechanism reduces structural complexity, lowers manufacturing and assembly costs, and improves reliability by eliminating the need for additional braking system components that could fail.
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 winch achieves a high transmission efficiency with a large speed ratio, has a lightweight and cost-effective structure, and features a reliable braking system that is easy to maintain, ensuring efficient operation and low operational costs.
Implementation Method 1
a planetary mechanism assembly having first and second planetary carriers that are disposed in the casing and rotatable about the longitudinal axis. First to third planetary gears are rotatably supported on the first and second planetary carriers via first to the third planetary gear shafts and engaged with the transmission gear, respectively.
Implementation Method 2
First to third planetary gears are rotatably supported on the first and second planetary carriers via first to the third planetary gear shafts and engaged with the transmission gear, respectively. An annular gear is fixed in the casing and engaged with the first to third planetary gears respectively.
Data Source
AI summary
A winch including a drum, a motor and a power transmission device. The power transmission device includes a casing and a planetary mechanism assembly having first and second planetary carriers rotatably disposed in the casing; first to third planetary gears rotatably supported on the first and second planetary carriers and engaged with the transmission gear; an annular gear fixed in the casing and engaged with the first to third planetary gears respectively; and a power output member having an input gear portion and an output gear portion, the input gear portion engages with the first to third planetary gears respectively, and the output gear portion engages with the inner drum gear portion of the drum. The winch achieves deceleration function with large speed ratio by a single stage planetary mechanism.