Vehicle Transmission Locking Mechanism for Emergency Drive
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Solution Overview
Problem
Existing transmission arrangements for agricultural work vehicles fail to maintain functionality in the event of a drive unit malfunction, leading to potential complete functional failure and inability to operate the vehicle.
Innovation Solution
A transmission arrangement with an input gearbox and base gearbox connected by a drive unit, featuring a locking device that arrests the second input shaft when a malfunction occurs, converting the transmission into a single fixed ratio to allow emergency operation, utilizing a locking projection and groove or frictional connection for mechanical stability and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a drive unit with multiple speed transmission paths is used to achieve high flexibility between input speed and output speed, then adaptability is improved, but reliability deteriorates because the system fails completely when the drive unit malfunctions
Solution Approach 1:
The patent implements a locking device that can arrest the second input shaft before complete system failure occurs. This locking mechanism serves as a pre-prepared safety measure that activates when the drive unit malfunctions, allowing the transmission arrangement to continue operating in a degraded but functional state, thus cushioning the impact of the malfunction on overall system reliability
Solution Approach 2:
The locking device acts as an intermediary mechanism between the drive unit and the base gearbox. When the drive unit fails, the locking device intervenes by arresting the second input shaft, preventing the malfunction from propagating through the entire transmission system and allowing the first input shaft to continue driving the base gearbox independently
2Reliability
If a locking device is added to arrest the second input shaft during malfunction, then reliability is improved by maintaining emergency drive mode, but device complexity increases
Solution Approach 1:
The locking device is designed as a separate, extractable component that can be integrated into the existing transmission arrangement without fundamentally redesigning the entire system. The locking mechanism operates independently on the second input shaft, allowing it to be added as a modular safety feature rather than requiring complex integration throughout the whole transmission system
Solution Approach 2:
The locking device replicates the essential function of speed control by providing a fixed transmission ratio path through the first input shaft when the normal drive unit fails. This creates a simplified copy of the transmission function that bypasses the malfunctioning drive unit, maintaining operational capability without requiring a complete backup transmission system
Data Source
AI summary
A transmission arrangement for a vehicle includes an input gearbox including a first input shaft, a base gearbox connected to an output side of the input gearbox in a direction of a power flow, and a drive unit for rotatably driving a drive shaft at a rotational speed. The drive shaft is drive-connected to a second input shaft of the input gearbox. The transmission arrangement also includes a locking device being transferable into a locking position for arresting a rotation of the second input shaft.