Dual-Output Seat Rail Transmission for Synchronized Sliding
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Solution Overview
Problem
Existing vehicle seat transmission systems face challenges in efficiently and synchronously adjusting vehicle seats between left-hand and right-hand power rail drive assemblies, often requiring complex motor couplings and gear systems that can be cumbersome and prone to synchronization issues.
Innovation Solution
A transmission system utilizing a dual output brushless motor to simultaneously drive both left-hand and right-hand bevel gearboxes, which are releasably coupled to worm gearboxes within power rail drive assemblies, allowing for smooth sliding movement of the vehicle seat along fixed long rails with a 90-degree torque redirection and a quick connection interface for easy coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drive motor is used to operatively couple left-hand and right-hand power rail drive assemblies through flex cables, then device complexity is reduced, but reliability deteriorates due to potential synchronization issues and cable failures
Solution Approach 1:
The system divides the drive mechanism into separate left-hand and right-hand power rail drive assemblies, each with its own worm gearbox and drive wheel. This segmentation allows independent operation of each side while maintaining synchronization through the shared rack system, eliminating the need for complex flex cable couplings while ensuring reliable synchronized movement.
Solution Approach 2:
The rack acts as an intermediary element that translates the rotational motion of the drive wheels into linear movement of the vehicle seat. By using the rack as a mechanical mediator, the system achieves synchronized movement without requiring direct coupling between the left and right motor assemblies, thereby improving reliability while maintaining simplicity.
2Adaptability or versatility
If worm gearboxes are included within each power rail drive assembly with releasable coupling to bevel gearboxes, then adaptability is improved for removable seat attachment, but device complexity increases due to additional gearbox components
Solution Approach 1:
The system employs a dynamic coupling mechanism between the bevel gearbox and worm gearbox that allows the vehicle seat to be easily attached and removed. The releasable coupling enables the bevel gearbox to be connected to or disconnected from the worm gearbox, providing adaptability for seat removal while using standardized interfaces that minimize overall system complexity.
Solution Approach 2:
The bevel gearbox is positioned within or adjacent to the power rail drive assembly, creating a nested configuration where the bevel gearbox can be easily coupled to the worm gearbox. This nesting arrangement allows for compact packaging of the additional gearbox components while maintaining ease of attachment and removal, thereby improving adaptability without proportionally increasing complexity.
3Productivity
If a dual output brushless motor simultaneously drives both bevel gearboxes, then productivity is improved through synchronized movement, but device complexity increases due to the dual output motor configuration
Solution Approach 1:
The system merges the drive functions for both left-hand and right-hand power rail assemblies into a single dual output brushless motor. This consolidation allows simultaneous driving of both bevel gearboxes, ensuring synchronized movement and improving productivity through faster seat adjustment while reducing the total number of motors required.
Solution Approach 2:
The dual output brushless motor serves multiple functions by simultaneously powering both left-hand and right-hand drive systems. This multi-functional motor design improves productivity through coordinated operation while the standardized output interfaces and symmetric configuration help manage the inherent complexity of the dual-output arrangement.
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
This solution enables efficient, synchronized, and adjustable vehicle seat movement between multiple seat locations, reducing complexity and synchronization issues while maintaining stability and ease of use, with the dual output brushless motor providing both fast and comfort speed adjustments.
Implementation Method 1
a dual output brushless motor configured to provide torque to both the first and second bevel gearboxes
Implementation Method 2
both left-hand and right-hand bevel gearboxes, which are releasably coupled to worm gearboxes within power rail drive assemblies, allowing for smooth sliding movement of the vehicle seat along fixed long rails with a 90-degree torque redirection
Implementation Method 3
worm gearboxes within power rail drive assemblies configured to rotate a drive wheel that is meshingly engaged with a rack within a respective left-hand or right-hand fixed long rail
Data Source
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AI summary
A transmission system for providing sliding movement of a vehicle seat within a vehicle includes a dual output motor having a left-hand and right-hand motor output shafts, a left-hand bevel gearbox and a right-hand bevel gearbox operatively coupled to a respective one of the left-hand and right-hand output motor shafts, a left-hand long rail assembly comprising a left- hand power rail drive assembly slidably coupled to a left-hand fixed long rail and operatively coupled to the left-hand bevel gearbox and a right-hand long rail assembly comprising a right- hand power rail drive assembly slidably coupled to a right-hand fixed long rail and operatively coupled to the right-hand bevel gearbox. The dual output motor rotates the left-hand and right- hand motor output shafts resulting in each of the left-hand and right-hand power rail drive assemblies being transposed along the respective left-hand and right-hand fixed long rails.