Reverse Gear Synchronization Device for Manual Transmissions
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Solution Overview
Problem
Manually operated gearboxes face difficulties in engaging reverse gear smoothly due to speed mismatches between the primary and secondary shafts, leading to grinding noise and wear, and existing solutions require significant structural modifications that are costly and complex for large-scale production.
Innovation Solution
A synchronization device featuring a support shaft with an idle gear wheel and a synchronizer ring, where the idle gear wheel is axially slidable and includes a friction surface, and the synchronizer ring is constrained angularly, allowing for synchronized engagement of the reverse gear without sticking or clashing, and is designed to be integrated within the existing gearbox structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing synchronization devices are implemented, then the reverse gear engagement smoothness is improved, but the structural complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent introduces a synchronizer ring as an intermediary component between the primary shaft and the idle gear wheel. This ring features friction surfaces that engage with the idle gear wheel hub to gradually equalize rotational speeds during reverse gear engagement, eliminating the need for complex structural modifications while achieving smooth engagement
Solution Approach 2:
The synchronization function is segmented into a dedicated synchronizer ring component with friction surfaces, separating the speed equalization function from the main shaft structure. This modular approach allows the synchronization mechanism to be added without fundamentally altering the existing gearbox structure
2Ease of operation
If the idle gear wheel engages with the second reverse gear wheel while rotating, then the reverse gear is engaged, but grinding noise and gear wear occur due to speed mismatch
Solution Approach 1:
The synchronizer ring performs preliminary speed equalization before the idle gear wheel engages with the second reverse gear wheel. The friction surfaces gradually reduce the rotational speed of the idle gear wheel to match the stationary second gear wheel, preventing grinding noise and wear during the engagement process
Solution Approach 2:
The friction surfaces of the synchronizer ring provide a cushioning effect by gradually dissipating the kinetic energy of the rotating idle gear wheel through friction, rather than allowing direct impact engagement. This beforehand cushioning prevents the harmful grinding noise and wear that would occur without speed synchronization
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 solution ensures smooth engagement of the reverse gear without noise or wear, maintaining the existing gearbox structure and reducing costs by providing automatic and progressive synchronization during the engagement maneuver, ensuring the idle gear wheel and synchronizer ring work as a single body to achieve synchronization.
Implementation Method 1
contoured by means of an elastic element along said axial travel
Implementation Method 2
said synchronizer ring having a second friction surface configured for engagement with said first friction surface
Data Source
AI summary
Described is a device for synchronization of a reverse gear for a vehicle gearbox including: a support shaft fixed in rotation; an idle gear wheel for engagement with a first reverse gear wheel on a gearbox primary shaft and a second reverse gear wheel on a gearbox secondary shaft, said idle gear wheel mounted rotatable and axially slidable on said support shaft and having a hub including a first friction surface; and a synchronizer ring mounted mobile on said support shaft along an axial travel and countered axially by an elastic element along said axial travel, said synchronizer ring having a second friction surface for engagement with said first friction surface. Axial movement of the idle gear wheel towards an engagement position of the reverse gear causes drawing of the synchronizer ring implementing, prior to reverse gear engagement, braking of rotary movement of the idle gear wheel.