Auxiliary Power Takeoff Gear Shift for Transmission Wear
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Solution Overview
Problem
The continuous operation of auxiliary power take-offs in motor vehicle transmissions leads to prolonged stress and wear on transmission elements, causing mechanical play and potential damage due to constant loading, which shortens the transmission's lifespan.
Innovation Solution
A method that automatically shifts the transmission into a protective gear after a defined time period, relieving load on transmission elements by changing gears, and allows for operation in this gear only as long as necessary, with the option to interrupt it when nominal power is required, using a control device and computer program product to manage the gearshift based on torque categories and operator input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the auxiliary power take-off is operated continuously at the same operating point, then the productivity is improved, but the transmission elements are stressed over a long period of time leading to wear and damage
Solution Approach 1:
The transmission gear is automatically changed at predetermined time intervals during auxiliary power take-off operation. The control device monitors the operation duration and shifts to a different gear (e.g., from first gear to second gear) after a defined time period has elapsed, thereby periodically varying the load distribution among transmission elements to prevent continuous stress on the same mechanical points
2Reliability
If the transmission gear is changed to relieve load on transmission elements, then the transmission durability is improved, but the device complexity increases due to automatic gear shifting control
Solution Approach 1:
The control device automatically monitors the operation duration of the auxiliary power take-off and autonomously initiates gear shifts without requiring manual intervention from the vehicle operator. The system serves itself by detecting when the predetermined time interval has elapsed and automatically executing the gear change to protect transmission elements, thereby reducing the burden on the operator while maintaining transmission durability
3Productivity
If the auxiliary power take-off is operated at high power continuously, then the productivity is improved, but the transmission elements are overloaded leading to rapid wear and damage
Solution Approach 1:
The system periodically varies the transmission gear during high-power auxiliary power take-off operation to distribute the mechanical load across different transmission elements over time. By shifting gears at predetermined intervals, no single set of transmission elements is subjected to continuous overloading, thereby enabling sustained high-power operation without compromising transmission element strength
Data Source
AI summary
A method for operating an auxiliary power take-off (5) in a drive-train of a motor vehicle with at least a drive aggregate (1) and with a transmission (2) connected between the drive aggregate (1) and an axle drive (4). To operate the power take-off (5,) a transmission gear is engaged in the transmission (2). During an uninterrupted operation of the power take-off (5), after lapse of a defined time period, an automatic shift to a protective gear is carried out in the transmission (2).