Planetary Output Gear Assembly for Multi-Range Torque Transfer
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Solution Overview
Problem
Current transmission systems for motor vehicles often require complex gear ratios and manual or automatic switching, which can be cumbersome and inefficient, especially in adapting engine speed to wheel speed for starting, stopping, and varying travel speeds.
Innovation Solution
A three-gear transmission system comprising an input mechanism with an input shaft and gear, a transmission mechanism with slidable gears, and an output mechanism including a sun gear assembly, planetary gear assembly, and outer gear, allowing for torque transfer through different gear configurations (neutral, low, intermediate, and high gears) with the use of locking units and brakes to optimize speed and torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gear ratios with manual or automatic switching are used, then the transmission can adapt engine speed to wheel speed for various conditions, but the system complexity and operational cumbersome increase
Solution Approach 1:
The transmission system is segmented into distinct gear ranges (first, second, third gear ranges) with each range having specific starting and ending speeds. This segmentation allows the system to simplify control by determining gear range based on current speed, rather than managing complex multi-gear switching for all conditions.
Solution Approach 2:
The system pre-establishes gear ranges with defined starting and ending speeds. When the current speed enters a predetermined range, the corresponding gear is automatically selected. This preliminary structuring of speed ranges simplifies the control logic and reduces operational complexity.
2Adaptability or versatility
If multiple gear ratios with manual or automatic switching are used, then the transmission can adapt engine speed to wheel speed for various conditions, but the operational efficiency decreases
Solution Approach 1:
The transmission system automatically determines the current rotational speed and selects the appropriate gear range without requiring manual intervention. The control unit autonomously monitors speed parameters and switches between gear ranges based on predetermined thresholds, improving operational efficiency by eliminating manual switching delays.
Solution Approach 2:
The system continuously monitors the current rotational speed and uses this feedback to determine which gear range is appropriate. The control unit adjusts gear selection based on real-time speed feedback, ensuring optimal gear engagement for current operating conditions and improving overall operational efficiency.
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 system provides a simplified and efficient means to adapt engine speed to wheel speed, offering three distinct gear modes that enhance starting, low-speed maneuverability, and high-speed performance by optimizing gear ratios and torque transfer, thus improving the overall efficiency and usability of the vehicle.
Implementation Method 1
The planetary gear assembly includes: (i) one or more planetary gears disposed around an outer circumference of the sun gear and meshed with the sun gear; and (ii) a casing concentric to the sun gear, not touching the sun gear, and joined to centers of the one or more planetary gears
Implementation Method 2
a first bushing disposed between the sun gear and the output shaft and configured to enable relative rotation between the sun gear and the output shaft
Data Source
AI summary
An output mechanism for use in a transmission includes an output shaft, a sun gear assembly, a planetary assembly, an outer gear, and an output gear. The sun gear assembly includes: a sun gear around the output shaft and a sun gear sleeve extending from the sun gear. The planetary assembly includes: one or more planetary gears around and meshed with the sun gear; and a casing surrounding the sun gear, joined to the one or more planetary gears, and configured to rotate around the sun gear when the one or more planetary gears rotate around the sun gear. The outer gear has inner teeth meshed with the one or more planetary gears and outer teeth being configured to be selectively meshed with a first external gear. The output gear is rotatably locked to the sun gear sleeve and is configured to be selectively meshed with a second external gear.