Automotive Direction Reversing Device with Automatic Speed Blocking
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Solution Overview
Problem
Existing direction-reversing devices for automotive wheeled vehicles are hazardous due to the risk of fracture and accidents, particularly when reversing at high speeds, as they require the vehicle to be stopped and the clutch sleeve elements to be manually switched, leading to vehicle instability.
Innovation Solution
A device with a blocking system that automatically engages when the input shaft exceeds a predetermined speed, preventing the switching of the moving clutch sleeve from one position to another, ensuring reliable direction reversal without the need for manual intervention and reducing the risk of accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle is completely stopped and clutch sleeve elements are manually switched for direction reversal, then the direction-reversing device can switch reliably, but the vehicle operation time is lost and manual intervention is required
Solution Approach 1:
The blocking system is designed to automatically detect when the vehicle is stopped (clutch sleeves not rotating) and prevent direction reversal until the vehicle is in motion. This preliminary detection and automatic blocking eliminates the need for manual intervention and ensures the vehicle is moving before reversal is permitted, thus resolving the contradiction between reliable switching and operational time loss
Solution Approach 2:
The blocking system operates autonomously by detecting the rotational state of the clutch sleeves and automatically blocking or permitting direction reversal based on vehicle motion status. This self-service mechanism eliminates manual intervention requirements while ensuring reliable operation, addressing both the reliability and time loss concerns
2Speed
If direction reversal is allowed at high speed, then the vehicle can change direction quickly, but the vehicle becomes unstable and may turn over
Solution Approach 1:
The blocking system provides continuous feedback on the rotational speed of the clutch sleeves, which correlates with vehicle speed. When high speed is detected (clutch sleeves rotating above a threshold), the system automatically blocks direction reversal, preventing vehicle instability and turnover while allowing quick reversal at safe speeds
Solution Approach 2:
The invention replaces manual control mechanisms with an automatic blocking system that uses centrifugal force or inertial effects from the rotating clutch sleeves to trigger the blocking mechanism. This substitution of mechanical feedback for manual operation enables automatic speed-based control, preventing high-speed reversal while maintaining operational efficiency
3Ease of operation
If manual switching of clutch sleeve elements is required, then the driver has control over direction reversal, but the risk of fracture and accidents increases
Solution Approach 1:
The blocking system operates autonomously to prevent dangerous reversal conditions, eliminating the need for drivers to manually assess and control reversal timing. The system self-monitors clutch sleeve rotation and automatically blocks unsafe operations, reducing both driver workload and accident risk while maintaining operational control
Solution Approach 2:
The blocking system acts as an intermediary safety mechanism between the driver's reversal command and the actual clutch switching operation. It mediates by blocking the command when conditions are unsafe (high speed or stopped vehicle), thus preventing fractures and accidents while still allowing driver-initiated reversal when conditions are appropriate
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 device allows for safe and reliable forward/reverse switching of the vehicle by preventing direction reversal at high speeds, thereby reducing the risk of accidents and vehicle instability, ensuring the device operates within a predetermined torque range.
Implementation Method 1
said at least one blocking element, sensitive to the speed of rotation of the input shaft, is able to switch automatically from the off position to the on position when the input shaft that carries it is driven at a speed of rotation that exceeds a predetermined threshold value
Data Source
AI summary
A direction-reversing device includes at least one input shaft, an output shaft, and direction-reversing element with a clutch sleeve including a moving clutch sleeve, mounted to move axially on one of the shafts carrying it to enable occupying forward and reverse positions. This device also includes a blocking element that is driven in rotation by the input shaft that carries the moving clutch sleeve, whereby this blocking element is mounted to move between the off position, in which the moving clutch sleeve is able to switch from one operating position to the next, and the on position, in which the blocking element forms an obstacle that prevents the switching of the moving clutch sleeve from one position to the next, being able to switch automatically from the off position to the on position when the input shaft is driven at a speed of rotation that exceeds a predetermined threshold value.